JP6677280B2 - Seedling transplanter - Google Patents

Description

  The present invention relates to a seedling transplanter having a planting device for planting seedlings in a field.

  2. Description of the Related Art In a conventional seedling transplanter, a reciprocating planting operation in a field has been known in which the burden on an operator is reduced by controlling a planting device in conjunction with a turning operation of a machine body. Patent Literature 1 below discloses a seedling transplanter applicable to a wide range of conditions, using a control unit having a plurality of turning patterns, in accordance with site conditions and work contents, in conjunction with a turning operation of the machine, and a planting device. A controllable configuration is disclosed.

  According to this configuration, a preferable turning pattern can be selected at the time of turning of the seedling transplanter, so that a turning operation suitable for the condition can be performed.

Japanese Patent No. 4543247

  However, in the seedling transplanter described in Patent Document 1, when the end of turning is detected at the operating position of the handle, the fertilizer is activated before the planting device is activated, and the fertilizer is supplied simultaneously with the start of planting of the seedling. Is what you do. Therefore, since the planting apparatus operates after the body is advanced a predetermined distance after operating the handle to the turning end position, there is a problem in that the supply of fertilizer is performed first and excess fertilizer is consumed.

  In addition, there is also a problem that a section where the fertilizer is not supplied occurs when the machine reaches the planting start position of the seedling before the fertilizer reaches the field from the storage hopper of the fertilizer through the fertilizer hose.

  An object of the present invention is to provide a seedling transplanter capable of performing an appropriate fertilization operation by preventing excess fertilizer from being consumed or a section where the fertilizer is not supplied, and improving workability of fertilization. .

  The above object of the present invention is achieved by the following means.

In the invention according to claim 1, rear wheels (11, 11) are provided on the left and right sides of the traveling vehicle body (2), and a seedling planting part (4) is provided at the rear part so as to be able to move up and down. A float (55) for contacting the field scene, a fertilizer (5) for supplying fertilizer to the field, an angle detection member (162) for detecting a rotation angle of the float (55), In the seedling transplanter equipped with a turning interlocking mechanism (T) for switching the operation of the seedling applying part (4) and the operation of the fertilizer application device (5) by raising and lowering the seedling mounting part (4) in conjunction with the turning of (2). A planting operation on / off member (25a) for turning on and off the planting operation of the seedling planting section (4), and a fertilization transmission on / off member (422) for turning on and off the operation of the fertilizer (5). A rear wheel rotation sensor (205, 205) for detecting a rotation speed of the rear wheel (11, 11); T), the seedling placement part (4) is raised, and the counting of the number of rotations of the rear wheel rotation sensors (205, 205) is started, so that the planting operation on / off member (25a) and the fertilization transmission on / off member ( 422) is turned off, and when the seedling planting section (4) descends and the float (55) comes into contact with the ground and the detection angle of the angle detection member (162) falls within a predetermined angle range, the fertilizer application transmission / inception member ( 422), and a control device (163) for turning on the planting operation on / off member (25a) when the rear wheel rotation sensor (205, 205) reaches a predetermined number of revolutions is provided . Right and left rear wheel gear cases (200L, 200R) for supplying driving force to the wheels (11, 11) are provided, and one of the left and right rear wheel gear cases (200L, 200R) passes through the rear wheel gear cases (200L, 200R). Fertilization The fertilizer transmission mechanism (420) is provided by providing a fertilizer transmission member (401) for supplying a driving force to (5) and the fertilizer transmission on-off member (422) for turning on and off the transmission to the fertilizer transmission member (401). A fertilization transmission actuator (426a) configured to turn on and off the fertilization transmission on / off member (422), a turning operation member (34) for steering the traveling vehicle body (2) is provided, and the traveling vehicle body (2) is mounted on the traveling vehicle body (2). Left and right front wheels (10, 10) are provided, the directions of the left and right front wheels (10, 10) are changed in conjunction with the operation of the turning operation member (34), and the rear inner wheel (11) turns during turning. A steering mechanism (S) for disengaging the side clutch (87) is provided, a turning direction detecting member (193) for detecting a turning operation direction of the turning operation member (34) is provided, and the control device (163) , The turning direction detecting member ( When the turning direction detected by 193) is the turning inside of the left and right rear wheel gear case (200R) provided with the fertilizer transmission member (401), the left and right other rear wheel gear case (200L) is the turning inside. A seedling transplanter characterized in that the fertilizer transmission actuator (426a) sets the fertilizer transmission on / off member (422) to an ON state earlier than when it is earlier than when .

The invention according to claim 2 is provided with a fertilization transmission switch (428) for operating the fertilization transmission actuator (426a), and the control device (163) controls the angle detection member during operation of the turning interlocking mechanism (T). When either the detection angle of (162) is within a predetermined angle range or the fertilization transmission switch (428) is turned on, the fertilization transmission actuator (426a) is operated to transmit the fertilization transmission. The on-off member (422) is set to the on state, and one end of the fertilization transmission member (401) is projected outside the rear wheel gear case (200L, 200R). and characterized by providing the rear wheel gear case (200L, 200R) manual operating member (426) for fertilizer supply of fertilizing device (5) by manual operation portion projecting from the That is a seedling transplantation machine of claim 1.

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  A first related invention according to the first to fourth aspects is to provide an engine (20) on the traveling vehicle body (2), and the front wheel (10, 10) and the rear wheel ( An auxiliary transmission (571) that transmits power to the auxiliary transmission (571, 11) is provided, and an auxiliary transmission switching operation member (17) for switching the auxiliary transmission (571) is provided. A transmission position detecting member (17b) for detecting the transmission of the vehicle is provided, and the transmission of the auxiliary transmission (571) from the engine (20) to the front wheels (10, 10) and the rear wheels (11, 11) is shut off. To form the neutral operation position (N) of the sub-transmission switching operation member (17) that switches the planting operation on / off member (25a) to the off state and switches the planting operation on / off member (25a) to the neutral state. Beside the front wheels (10, 10) and When the transmission to the rear wheels (11, 11) is stopped, the sub-transmission switching operation member switches the planting operation on / off member (25a) to the stopped planting state in which the planting device (52) is operated with the planting operation on / off member (25a) in the on state. A stop planting position detecting member (430) that forms the stop planting position (W) of (17) and detects that the sub-transmission changeover operating member (17) is located at the stop planting position (W). The control device (163) detects that the sub-transmission switching operation member (17) has been operated to the stop planting position (W) by the stop planting position detecting member (430), and outputs the float (55). ) Is within a predetermined angle range, the planting operation on / off member (25a) for turning on and off the planting operation of the seedling planting section (4) is turned on, and the stop planting position detection is performed. The sub-transmission switching operation member (17) is stopped by the member (430). (W), when the rotation angle of the float (55) detected by the angle detection member (162) is out of a predetermined angle range even if it is detected that the operation has been performed to (W), the planting operation on / off member ( 25a) is a seedling transplanter characterized by being in a cut state.

  According to a second related invention relating to the first to fourth aspects, an engine (20) is provided on the traveling vehicle body (2), and the front wheel (10, 10) and the rear wheel ( An auxiliary transmission (571) that transmits power to the auxiliary transmission (571, 11) is provided, and an auxiliary transmission switching operation member (17) for switching the auxiliary transmission (571) is provided. A transmission position detecting member (17b) for detecting the transmission of the vehicle is provided, and the transmission of the auxiliary transmission (571) from the engine (20) to the front wheels (10, 10) and the rear wheels (11, 11) is shut off. To form the neutral operation position (N) of the sub-transmission switching operation member (17) that switches the planting operation on / off member (25a) to the off state and switches the planting operation on / off member (25a) to the neutral state. Beside the front wheels (10, 10) and When the transmission to the rear wheels (11, 11) is stopped, the sub-transmission switching operation member switches the planting operation on / off member (25a) to the stopped planting state in which the planting device (52) is operated with the planting operation on / off member (25a) in the on state. A stop planting position detecting member (430) that forms the stop planting position (W) of (17) and detects that the sub-transmission changeover operating member (17) is located at the stop planting position (W). And a continuously variable transmission (23) for transmitting power from the engine (20) to the auxiliary transmission (571) is provided, and a main transmission switching operation member (16) for performing a shift operation of the continuously variable transmission (23) is provided. A main speed change operation amount detecting member (16b) for detecting an operation of the main speed changeover operation member (16), and the continuously variable transmission (23) based on the detection of the main speed change operation amount detection member (16b). To rotate the trunnion shaft (295) An actuator (103) is provided, and a trunnion shaft detection member (113) for detecting the rotation position of the trunnion shaft (295) is provided. The control device (163) is controlled by the main shift operation amount detection member (16b). It is detected that the speed change switching operation member (16) has been operated to the neutral position for stopping the traveling of the traveling vehicle body (2), and the rotation angle of the float (55) is set to a predetermined angle by the angle detection member (162). When the sub-transmission switching operation member (17) is operated to the stop planting position (W) while detecting that it is within the range, the planting operation on / off member (25a) is brought into the on state. The seedling transplanter according to any one of claims 1 to 4, characterized in that:

  According to the first aspect of the present invention, when the angle detection member (162) detects that the float (55) has touched the ground during turning, the fertilizer application transmission / disconnection with the planting operation on / off member (25a) in the off state. By operating the fertilizer device (5) with the member (422) in the on state, the fertilizer device (5) can be operated to start the supply of fertilizer prior to the start of planting of the seedling after turning. Therefore, at the start of planting of the seedlings after turning, the fertilizer arrives at the field and occurrence of a section where the fertilizer is not supplied is prevented.

  When turning, the planting operation on / off member (25a) and the fertilization transmission on / off member (422) are turned off to stop the operation of the seedling planting section (4) and the fertilizer application device (5). The fertilizer is prevented from being released at a position where the planting section (4) is separated from the field scene, and the spread of the fertilizer is prevented.

The fertilizer device (5) is stopped after the planting device (52) in which the planting operation on / off member (25a) is cut off, so that the fertilizer moving from the fertilizer device (5) to the field scene is stopped. Can be supplied to the field while the seedling planting section (4) rises to the maximum position, so that fertilizer is not supplied more than necessary at the start of fertilizer supply after turning, and excess fertilizer is supplied. Is prevented.
Further, the fertilizer transmission mechanism (420) is configured by providing the fertilizer transmission member (401) and the fertilizer transmission on / off member (422) on the left and right rear wheel gear cases (200L, 200R). Can be turned on and off independently, thereby preventing an excess or deficiency in the supply of fertilizer.
In addition, the rear wheel gear case (200L, 200R) for transmitting the driving force to the rear wheels (11, 11) is provided with the fertilizer transmission member (401) and the fertilizer transmission on / off member (422), so that the rear wheel gear case (200L) is provided. , 200R) to the fertilizer application device (5).
Further, by turning on and off the fertilization transmission on / off member (422) by the fertilization transmission actuator (426a), the on / off of the fertilization transmission on / off member (422) can be automated, thereby improving work efficiency. In addition, since the fertilizer device (5) can be reliably turned on and off, it is possible to prevent the supply amount of the fertilizer from being excessive or insufficient.
When the left and right rear wheel gear case (200R) provided with the fertilizer application transmission member (401) is turned inside, the timing at which the fertilizer application actuator (426a) puts the fertilizer application input / output member (422) into the on state. , The supply of fertilizer is started at the same timing as when the left and right rear wheel gear case (200R) is on the outside of the turn, thereby preventing excess or deficiency of the supply of fertilizer.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, one end of the fertilization transmission member (401) is projected outside the rear wheel gear case (200L, 200R). The provision of the manual operation member (426) on the protrusion allows the fertilizer application device (5) to be manually operated to supply the fertilizer, so that the fertilizer can be supplied without moving the traveling vehicle body (2). The setting of the supply amount can be checked, and unnecessary fuel consumption can be suppressed .

In addition, by providing the manual operation member (426) on the fertilizer application transmission member (401) projecting from the rear wheel gear case (200L, 200R), the transmission path to the fertilizer application device (5) can be shortened. The force for operating the manual operation member (426) is reduced .

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  In addition to this, the effect of the first related invention is that, in addition to the effects of the inventions according to the first to fourth aspects, if the float (55) is not in the ground contact state, the sub-transmission switching operation member (17) is operated Even if it does not switch to the stop planting state, it is possible to prevent the seedling planting section (4) from performing the planting operation of the seedlings above the field scene due to an erroneous operation, so that the consumption of unnecessary seedlings is prevented. You.

  When the shift switching operation member (17) is operated to the stop planting position (W), the seedling planting section (4) is operated, so that the traveling vehicle body (2) can be planted without moving from the spot. Therefore, the planting position of the seedlings can be easily adjusted to the adjacent streak, and the planting accuracy of the seedlings can be improved.

  The effect of the second related invention is that, in addition to the effects of the inventions described in the first to fourth aspects, the float (55) is in the ground contact state, and the main speed changeover operating member (16) is in the neutral position. At this time, when the sub-transmission switching operation member (17) is operated to the stop planting position (W), the seedling planting section (4) is actuated, and the seedlings are moved without moving the traveling vehicle body (2) from the place. Since the seedlings can be planted, the planting position of the seedlings can be easily adjusted to the adjacent strip, and the planting accuracy of the seedlings is improved.

  Further, since the seedling planting section (4) can prevent the seedling planting operation from being performed above the field scene due to an erroneous operation, consumption of unnecessary seedlings can be prevented.

Side view of riding rice transplanter Top view of riding rice transplanter A perspective view showing a steering configuration of right and left front wheels of a riding type rice transplanter. (A) Plan view of a display panel of a riding type rice transplanter, (b) Plan view of an operation panel Block diagram of control device for riding rice transplanter Schematic plan view showing the transmission configuration of the riding type rice transplanter FIG. 2 is a schematic plan view showing a driving force transmission configuration inside a left rear wheel gear case of a riding type rice transplanter. FIG. 2 is a schematic plan view showing a driving force transmission configuration inside a right rear wheel gear case of a riding type rice transplanter. Flowchart of control device for riding rice transplanter A plan view of the transmission mechanism to drive wheels in the transmission case of a riding rice transplanter Operation explanatory diagram of the auxiliary transmission mechanism in the transmission case of the riding rice transplanter Transmission mechanism diagram of operation position (road speed) of sub-transmission changeover operation member Transmission mechanism diagram of operation position (planting work speed) of sub-transmission changeover operation member Transmission mechanism diagram of the operation position (neutral) of the sub-transmission changeover operation member Transmission mechanism diagram of operation position of sub-shift switching operation member (with stop planting) Flowchart of control device of another configuration example Flowchart of control device of another configuration example Flowchart of control device of another configuration example Flowchart of control device of another configuration example Flowchart of the stop planting function of the control device of the riding type rice transplanter Flowchart of stop planting process 0 Flowchart of stop planting process 1 Flowchart of stop planting process 2 Flowchart of stop planting process 3 Flowchart of stop planting process 4 Flowchart summarizing FIGS. 21 to 25 Flowchart summarizing FIGS. 21 to 25 Hydraulic circuit diagram of continuously variable transmission for riding rice transplanter Side sectional view of the continuously variable transmission Sectional view of a continuously variable transmission Enlarged view of the piston part of the continuously variable transmission Piston part of continuously variable transmission with another configuration example

  An embodiment of the present invention will be described as follows.

  FIGS. 1 and 2 show a left side view and a plan view of an eight-row riding type rice transplanter as the seedling transplanter of the present embodiment. In this specification, left and right are defined as left and right, respectively, in the forward direction of the rice transplanter 1, and front and rear are defined as front and rear, respectively.

  In the rice transplanter 1, a seedling planting section 4 is mounted on a rear side of the traveling vehicle body 2 via a lifting link mechanism 3 so as to be able to move up and down, and a main body of a fertilizer device 5 is provided on an upper rear part of the traveling vehicle body 2. . The traveling vehicle body 2 is a four-wheel drive vehicle including a pair of left and right front wheels 10, 10 and a pair of right and left rear wheels 11, 11, which are drive wheels, and a transmission case 12 is disposed at a front portion of the fuselage. A front wheel final case 13 is provided on the left and right sides of the case 12, and a pair of left and right front wheels 10, 10 are respectively attached to left and right front axles projecting outward from front wheel support portions of the left and right front wheel final cases 13.

  In addition, the traveling body 2 has a main frame 15 having a front end fixed to a rear surface of the transmission case 12 and a rear frame of the traveling body 2 that constitutes a rear portion of the main frame 15. 100 (FIG. 2), and a pair of left and right link base frames 42L, 42R that rise upward from both ends of the base frame 100 and are connected to the front end of the lifting link mechanism 3.

  A left rear wheel gear case 200L and a right rear wheel gear case 200R for housing a transmission mechanism for transmitting a driving force from the engine 20 to a pair of left and right rear wheels 11, 11 are provided on the right and left rear portions of the traveling vehicle body 2, respectively. Is arranged.

  The engine 20 is mounted on the main frame 15, and rotational power of the engine 20 is transmitted to the transmission case 12 via a belt transmission 21 and a continuously variable transmission 23 as a main transmission. Then, the rotational power transmitted to the transmission case 12 is separated and taken out into traveling power and external take-out power by an auxiliary transmission (switching device) 571 (FIG. 10) in the transmission case 12. In the auxiliary transmission 571, the output of the traveling power from the engine 20 to the front wheels 10, 10 and the rear wheels 11, 11 is changed.

  Part of the traveling power is transmitted to the front wheel final case 13 to drive the pair of left and right front wheels 10, 10, and the remaining part is transmitted to the left rear wheel gear case 200L via the first transmission shaft 230L. The driving force is transmitted to the right rear wheel gear case 200R via the second transmission shaft 230R, and drives the pair of left and right rear wheels 11, 11.

  In addition, a part of the traveling power transmitted to the left rear wheel gear case 200L is transferred to the seedling plant via the ground adjustment clutch mechanism 320 (FIGS. 6 and 7) provided in the left rear wheel gear case 200L. Power is transmitted to the leveling rotor 27 attached to the section 4 (the combination of the first leveling rotor 27a and the second leveling rotor 27b may be simply referred to as the leveling rotor 27). The leveling clutch mechanism 320 will be described later with reference to FIG.

  In addition, part of the traveling power transmitted to the right rear wheel gear case 200R is transmitted to the fertilizer device 5 via the fertilizer transmission mechanism 420 (FIGS. 6 and 8) provided in the right rear wheel gear case 200R. It is transmitted. The fertilizer transmission mechanism 420 will be described later with reference to FIG.

  The external take-out power is transmitted to the planting clutch case 25 provided at the rear of the traveling vehicle body 2, and then transmitted to the seedling planting section 4 by the planting transmission shaft 26.

  An upper portion of the engine 20 is covered with an engine cover 30, and a cockpit 31 is provided thereon. A front cover 32 containing various operation mechanisms is provided in front of the cockpit 31. A turning operation member 34 for steering the left and right front wheels 10, 10 is provided above the front cover 32.

  A main transmission switching operation member 16 for switching the output of the continuously variable transmission 23 is provided in the vicinity of the cockpit 31. When the main transmission switching operation member 16 is rotated in the front-rear direction along the lever guide 16a (FIG. 4), the transmission is switched. The trunnion shaft 295 (FIG. 30) for changing the inclination angle of the swash plate 69 (FIG. 29) for adjusting the oil pressure output from the step transmission 23 can be rotated, thereby changing the output of the continuously variable transmission 23. As a result, the traveling body 2 can be moved forward and backward (start), stopped (neutral), and accelerated and decelerated.

  The operation position of the main shift switching operation member 16 is detected by a main shift operation amount detection member 16b provided at the base of the main shift switching operation member 16. The controller 163 adjusts the continuously variable speed by the trunnion shaft electric motor 103 shown in FIG. 5 in accordance with the operation amount and the operation direction from the neutral position 16aa (FIG. 4) detected by the main transmission operation amount detection member 16b (FIG. 5). In this configuration, the trunnion shaft 295 of the device 23 is rotated. By changing the inclination angle of the swash plate 69 according to the rotation angle of the trunnion shaft 295, the output of the continuously variable transmission 23 can be changed steplessly. The above-mentioned trunnion shaft electric motor 103 is operated forward to rotate forward and reverse to reverse rotation.

  Further, by rotating a switching operation member (hereinafter referred to as an auxiliary transmission switching operation member) 17 (FIG. 2) along the lever guide 17a (FIG. 4), the auxiliary transmission 571 is moved on the road at high speed (high speed). ), A planting work speed (low speed) for work, or a neutral position that is not transmitted to the traveling system. The operating position of the sub-transmission switching operation member 17 is detected by a sub-transmission operation position detecting member 17b (FIG. 5) provided at the base of the sub-transmission switching operation member 17.

  The left and right lower ends of the engine cover 30 and the front cover 32 are horizontal floor steps 35. The floor steps 35 are partially lattice-shaped (see FIG. 2), so that mud on shoes of workers walking on the floor steps 35 falls to the field.

  The lifting link mechanism 3 has a parallel link configuration, and includes one upper link 40 and a pair of left and right lower links 41. The upper link 40 and the lower link 41 are rotatable about a pair of left and right link base frames 42L, 42R that form a rear view portal-shaped frame whose base side is erected on the base frame 100 at the rear end of the main frame 15. , And a vertical link 43 is connected to the distal end thereof. A connecting shaft 44 rotatably supported by the seedling planting portion 4 is inserted and connected to the lower end of the vertical link 43, and the seedling planting portion 4 is rotatably connected around the connecting shaft 44.

  An elevating hydraulic cylinder 46 is provided between a support member fixed to the main frame 15 and a distal end of a swing arm (not shown) integrally formed with the upper link 40, and the elevating hydraulic cylinder 46 is expanded and contracted by hydraulic pressure. Then, the upper link 40 rotates up and down, and the seedling planting section 4 moves up and down with a substantially constant posture.

  The seedling planting section 4 has an eight-row planting structure. A planting transmission case 50 also serving as a frame, mats and seedlings are reciprocated right and left, and the seedlings are supplied one plant at a time to the seedling take-out port 51a of each line. When all the seedlings in one row are supplied to the seedling take-out port 51a, the seedling mounting table (seedling placement section) 51 for transferring the seedlings downward by the seedling feed belt 51b, and the seedling supplied to the seedling take-out port 51a to a seedling attachment 52a. And a planting device 52 for planting in a field.

  In the lower part of the seedling planting part 4, a float 55 is provided at the center, and a middle float 57 and a side float 56 are provided on both left and right sides thereof. When the aircraft advances while the float 55, the middle float 57, and the side float 56 are in contact with the mud surface of the field, the float 55, the middle float 57, and the side float 56 slide while leveling the mud surface. Seedlings are planted at the leveling ground by the planting device 52.

  The front end of the float 55, the middle float 57, and the side float 56 are rotatably mounted in the vertical direction corresponding to the unevenness of the soil surface of the field. By detecting an angle detection member 162 provided on the upper front side of the float 55 and switching the electromagnetic hydraulic valve 161 (FIG. 5) for controlling the elevating hydraulic cylinder 46 in accordance with the detection result, the seedling placement part 4 is raised and lowered. Always keep the seedling depth constant.

  The fertilizer applicator 5 feeds out a specific amount of granular fertilizer stored in the fertilizer tank 60 by the feeder 61, and the fertilizer is attached to the left and right sides of the float 55, the middle float 57, and the side float 56 by the fertilizer hose 62. It is guided to a guide (not shown) and dropped into a fertilizer application structure formed near the side portion of the seedling planting strip by a groove forming body 64 provided on the front side of the fertilizer application guide. The air generated by the blower 58 driven by the blower electric motor 53 is blown into the fertilizer hose 62 via the air chamber 59 which is long in the left-right direction, and the fertilizer in the fertilizer hose 62 is transported by wind pressure. I have.

  Further, the seedling mounting table 51 is configured to slide in the left-right direction, and a pair of spare seedling frames 38 for holding replenishing seedlings are provided on both left and right front portions of the traveling vehicle body 2.

  FIG. 3 is a perspective view showing a steering configuration of the left and right front wheels 10, 10 of the riding type rice transplanter shown in FIG. The configuration of a portion where the left and right front wheels 10, 10 are steered by the turning operation member 34 will be described.

  The turning operation member 34 is fixed to an upper portion of a steering shaft provided in the front cover 32, and the rotation of the steering shaft is reduced and transmitted to the output shaft 174 via a steering speed change gear provided in the transmission case 12. Is done. A pitman arm 175 is fixed to the lower end of the output shaft 174 so as to protrude from the bottom surface of the transmission case 12. The front left and right sides of the pitman arm 175 and the left and right front wheel final cases 13, 13 are connected by left and right rods 176, 176 (FIG. 1).

  Therefore, when the turning operation member 34 is rotated, it is transmitted to the steering shaft, the steering transmission gear, the output shaft 174, the pitman arm 175, the left and right rods 176, 176, the left and right front wheel final cases 13, 13, and the left and right. The front wheels 10 are steered left and right.

  On the other hand, on the rear upper surface of the pitman arm 175, an operation roller 177 is rotatably provided, and a notch 178 which is notched in a U-shape in plan view and surrounds both left and right sides of the operation roller 177 is provided. The driven body 179 is rotatably supported on the bottom surface of the transmission case 12.

  The left and right sides of the driven body 179 are connected to left and right side clutch operating arms 86, 86 for operating the left and right side clutches 87, 87 of the side clutch shafts 586, 586 (FIG. 10) of the left and right rear wheels 11. The front portions of the left and right rods 180, 180 are connected. The left and right side clutches 87, 87 are always engaged.

  Therefore, when the turning operation member 34 is turned clockwise by more than a predetermined amount (the amount by which the operator turns clockwise with the intention of turning the body to the right, for example, 200 degrees), the pitman arm 175 also turns clockwise and operates. The driven body 179 is rotated in the direction (d) to pull the right rod 180 so that the roller 177 rotates in the direction (c) and presses the left side surface 178a of the cutout portion 178 of the driven body 179, thereby pulling the right side clutch operating arm. 86 is operated to disengage the right side clutch 87.

  The turning mechanism 34, the output shaft 174, the pitman arm 175, the operating roller 177, the driven member 179, the rod 180, the side clutch operating arm 86 for clutch interlocking, and the like are referred to as a steering mechanism S. Since the right rear wheel 11 on the turning center side is in an idle state, the right rear wheel 11 does not damage the cultivator and does not lift a large amount of mud and roughen the mud surface. It can be done smoothly.

  Conversely, when the turning operation member 34 is turned to the left by a predetermined amount or more, the pitman arm 175 also turns to the left, the operation roller 177 turns in the opposite direction to (C), and the right side of the notch 178 of the driven body 179. In order to press the surface 178b, the driven body 179 is rotated in the direction opposite to (d), the left rod 180 is pulled, the left side clutch operation arm 86 is operated, the left side clutch 87 is disengaged, and the left rear side on the turning center side is turned. Since the wheel 11 enters the idle state, the left rear wheel 11 is prevented from damaging the cultivator, and the left turn can be smoothly performed without lifting a large amount of mud and roughening the mud surface.

  As described above, at the time of turning, the side clutch 87 on the outside of turning is maintained in the on state, but only the side clutch 87 on the inside of turning can be in the off state.

  FIG. 4A shows an example of a plan view of the display panel 80, and FIG. 4B shows an example of a plan view of the operation panel 70. FIG. 5 is a block diagram of the control device 163 of the rice transplanter 1 of FIG.

  In the rice transplanter 1 of the present embodiment, an operation panel 70 in which various switches, buttons, dials, and the like are disposed near the turning operation member 34 above the front cover 32 is provided. A display panel 80 for displaying operation information such as a driving operation position, operation, operation control state, and the like is provided.

  As shown in FIG. 4, the main transmission switching operation member 16 is disposed on the right side and the sub transmission switching operation member 17 is disposed on the left side when viewed from the cockpit 31. Each ridge clutch (not shown) is disposed below the main transmission switching operation member. An on / off ridge clutch switch 82 is arranged. The ridge clutch switch 82 includes one and two ridge clutch switches 82a and three and four ridge clutch switches 82b on the left side, and five and six ridge clutch switches 82c and seven and eight ridge switches on the right side. A row clutch switch 82d is provided.

  On the right side of the guide 17a of the sub-shift-switching operation member 17, a turning interlock switch 90 for turning on and off a turning interlocking mode in which the operation of the seedling planting section 4, the raising and lowering and the operation of the fertilizer device 5 are automatically performed. Above the turning interlock switch 90, a planting start adjustment dial 92, a height adjustment dial 94 for the leveling rotor, and the like are arranged.

  The "planting" on the upper side of the monitor 83 of the display panel 80 lights up when the planting operation on / off member 25a in the planting clutch case 25 is turned on, and the turning interlocking lamp 84 turns on when the turning interlocking mode is turned on. I do. The on / off state of the planting operation on / off member 25a is detected by the planting operation detecting member 25ab. In addition, the turning interlock lamp 84 displays “turn”, for example. Further, a lamp or the like which is turned on when the ridge clutch is turned off, when the fertilizer from the fertilizer applicator 5 is clogged, or when the fertilizer runs out is provided.

  When the turning interlock mode is set by the turning interlock switch 90, the turning interlock mechanism T functions. Specifically, when the turning operation member 34 is operated and turning starts, the control device 163 switches the electromagnetic hydraulic valve 161 to shrink the elevating hydraulic cylinder 46 and raise the seedling placement part 4. Let it. Then, the counting of the rotational speed difference between the left and right rear wheel rotation sensors 205, 205 provided on the rear wheel shaft 341 is started, and the left and right rear wheel rotation sensors 205, 205 are operated after the turning operation member 34 is operated to the turning end side. When the rotational speed difference of 205 becomes less than a certain value, the controller 163 switches the electromagnetic hydraulic valve 161 to extend the elevating hydraulic cylinder 46 to lower the seedling planting section 4 and to rotate the left and right rear wheel rotation sensors 205, 205. When the number of revolutions reaches a predetermined number of revolutions, the planting operation on / off member 25a is turned on. This will be described in more detail below.

  First, when the operator turns the turning operation member 34 to the right or left by 200 degrees, turning operation starts (the turning operation member 34 turns left or right at a maximum of 360 to 400 degrees). The turning start timing is calculated by the control device 163 based on the detection result of the turning direction detecting member 193 of the turning operation member 34. Further, the turning direction detecting member 193 can detect not only the steering angle of the turning operation member 34 but also the turning direction. The turning direction detecting member 193 is a potentiometer provided on the steering shaft of the turning operation member 34.

  Then, when the turning traveling starts, a signal is output from the control device 163 to control an electromagnetic solenoid (not shown) for operating the electromagnetic hydraulic valve 161 to raise the seedling planting section 4 and disconnect the planting clutch motor 24. Side to cut the planting operation on / off member 25a. The steering mechanism S disengages the inner side clutch 87 of the left and right side clutches 87, 87 (FIG. 10) provided in the transmission case 12.

  Then, the counting of the rotational speed difference between the left and right rear wheel rotation sensors 205, 205 is started, and after the turning operation member 34 is operated to the turning end side, the side clutch 87 inside the turning is engaged, and the left and right rear wheels are turned on. When the rotation speed difference between the wheel rotation sensors 205, 205 becomes less than a certain value, the control device 163 controls the electromagnetic solenoid that operates the electromagnetic hydraulic valve 161 to lower the seedling planting section 4 and rotate the left and right rear wheels. When the number of rotations of the sensors 205, 205 reaches a predetermined number of rotations, the planting clutch motor 24 is operated to the entry side, and the planting operation on / off member 25a is turned on.

  When the planting operation on / off member 25a is in the on state, the seedling mounting tool 52a of all the planting streaks is activated, and the seedling mounting table 51 also starts moving left and right. The seedling feed belt 51b of all the planted strips operates. The transmission mechanism is transmitted from the planting operation on / off member 25a to the seedling planting section 4 by the planting transmission shaft 26, and in the seedling planting section 4 to the corresponding seedling planting tool 52a via each ridge clutch. The seedlings are transmitted to the corresponding seedling feed belts 51b via the seedling feed clutches (not shown) in the seedling planting section 4. As described above, planting of seedlings is automatically started without operating the seedling planting lever 19 (FIG. 2).

  The fertilizer applicator 5 also operates in conjunction with the raising and lowering of the seedling planting section 4, the configuration of which will be described later.

  Next, a transmission configuration of the driving force transmitted from the transmission case 12 side in the left rear wheel gear case 200L will be described with reference to FIGS. 6 and 7. FIG. 6 is a schematic plan view showing the transmission configuration in the transmission case 12, the left rear wheel gear case 200L, and the right rear wheel gear case 200R. FIG. 7 is an enlarged view of the left rear wheel gear case 200L in FIG. is there. 6 and 7, the front side, the rear side, the left side, and the right side of the traveling vehicle body 2 are represented by arrows F, B, L, and R, respectively. The same applies to FIG. 8 described later.

  As shown in FIGS. 6 and 7, power is transmitted from the transmission case 12 side to the first input shaft 321L to the ground adjustment clutch mechanism 320 including the first input shaft 321L via the first transmission shaft 230L. The power is transmitted from the first bevel gear 321aL on the rear end side of the first input shaft 321L to the second rotating shaft 340L to which the second bevel gear 330L is fixed, and the small diameter fixed to the second rotating shaft 340L. The left rear wheel shaft 341L is configured to rotate by being transmitted to the large-diameter gear 332L via the gear 331L.

  Next, the configuration of turning on and off the driving force to the rotor transmission shaft 301 by the ground adjustment clutch mechanism 320 will be described.

  The leveling clutch mechanism 320 shifts the first input shaft 321L, the leveling rotor on / off clutch 322 slidably connected to the first input shaft 321L, and the leveling rotor on / off clutch 322 toward the first bevel gear 321aL. An urging spring 323 that constantly urges, and a protrusion 324aL that presses a flange 322a of a ground adjustment rotor on / off clutch 322 against the urging force of the urging spring 323 are provided at the distal end, and as shown in FIG. A switching shifter 324L that shifts the leveling rotor on / off clutch 322 in the direction of arrow E along the axial direction of the shaft 321L, and the first input shaft 321L, which is loosely fitted to the first bevel gear 321aL side of the leveling rotor on / off clutch 322. The first gear 325 is provided.

  A plurality of first clutch claws 322b are formed on the surface of the leveling rotor on / off clutch 322 on the first gear 325 side, and the first clutch claw 322b is provided on the surface of the first gear 325 on the side of the leveling rotor on / off clutch 322. A plurality of second clutch claws 325a are formed to fit with the claws 322b. The power transmitted by the rotation of the first gear 325 is transmitted to the second gear 312 fixed to the rotor transmission shaft 301 via the chain 311. As a result, the driving force is transmitted to the leveling rotor 27 side.

  Further, the base 324b side of the switching shifter 324L is connected to a switching interlocking mechanism 326a provided on the traveling vehicle body 2 side of the lifting link mechanism 3 and configured by a rod, a wire, a spring, and the like. When the raising and lowering link mechanism 3 moves upward to a predetermined height when the airplane body turns or reverses, or when the seedling planting section 4 is raised by an operation of an operator, the switching interlocking mechanism 326a operates the switching shifter 324L, and the leveling clutch. The mechanism 320 is turned off. Thereby, when the seedling planting part 4 moves up, the driving of the terrain rotor 27 can be stopped.

  Further, as described above, if the rotor transmission shaft 301 for transmitting the driving force to the leveling rotor 27 side is disposed inside the body, the rotor transmission shaft 301 is located inside the body relative to the left rear wheel gear case 200L. Since the rear rear wheel gear case 200L is disposed at a position separated from the left rear wheel 11 located outside the fuselage with respect to the left rear wheel gear case 200L, mud that is flipped up by the rotation of the rear wheel 11 is received by the left rear wheel gear case 200L, and the rotor The oil is less likely to be scattered on the transmission shaft 301, and damage to the oil seal of the rotor transmission shaft 301 is prevented.

  Lubricating oil for an internal gear mechanism is sealed in the left rear wheel gear case 200L, and an oil seal is provided at a position where the rotor transmission shaft 301 protrudes. If the oil seal breaks, the lubricating oil may come out with the rotation of the rotor transmission shaft 301, but the above configuration makes it difficult for the lubricating oil to leak out.

  Further, the rotor transmission shaft 301 may be disposed below the left rear wheel gear case 200L. Thus, the height of the leveling rotor 27 below the left rear wheel gear case 200L is close to the height at the time of operation, and transmission loss of driving force can be prevented.

  On the other hand, the rotor transmission shaft 301 may be arranged above the left rear wheel gear case 200L. As a result, the mud is less likely to be scattered on the rotor transmission shaft 301, so that the oil seal is prevented from being damaged by the influence of the mud and the durability of the rotor transmission shaft 301 is improved.

  Next, the transmission configuration of the driving force transmitted from the transmission case 12 side in the right rear wheel gear case 200R will be described with reference to FIGS. FIG. 8 is a schematic plan view showing a driving force transmission configuration inside right rear wheel gear case 200R.

  As shown in FIG. 6, in the fertilizer transmission mechanism 420, power is transmitted from the transmission case 12 side to the second input shaft 321R via the second transmission shaft 230R. The power is transmitted from the first bevel gear 321aR on the rear end side of the second input shaft 321R to the second rotating shaft 340R to which the second bevel gear 330R is fixed, and the small diameter fixed to the second rotating shaft 340R. The right rear wheel shaft 341R is configured to rotate by being transmitted to the large-diameter gear 332R via the gear 331R.

  Next, the configuration of turning on and off the driving force to the fertilization transmission member 401 by the fertilization transmission mechanism 420 will be described.

  The fertilization transmission mechanism 420 includes a second input shaft 321R, a fertilization transmission on / off member 422 slidably connected to the second input shaft 321R, and a fertilization transmission / on / off member 422 with the first bevel gear 321aR side. A fertilizing urging spring 423 that constantly urges to the opposite side, and a protrusion 324aR that presses the fertilizing flange 422a of the fertilizing transmission on / off member 422 against the urging force of the fertilizing urging spring 423 are provided at the distal end. As shown, the switching shifter 324R that shifts the fertilizer application on / off member 422 in the direction of arrow E along the axial direction of the second input shaft 321R, and the second shift shaft 324R that fits loosely on the second input shaft 321R. A third bevel gear 425 is provided on the opposite side of the one bevel gear 321aR.

  A plurality of third clutch claws 422b are formed on the surface of the fertilizer transmission on / off member 422 on the third bevel gear 425 side, and the third ferrule transmission on / off member 422 side of the third bevel gear 425 is A plurality of fourth clutch claws 425a are formed to fit with the third clutch claws 422b.

  Further, a root portion 324bR of the switching shifter 324R is connected via a cable 427 to a fertilization transmission actuator 426a for switching the driving force of the fertilizer application device 5, and interlocks with the raising and lowering of the seedling planting portion 4, and thereby the fertilization transmission actuator 426a. Is used to switch the fertilizer transmission on / off member 422.

  The control device 163 is configured to operate the planting clutch motor 24 in accordance with the raising and lowering of the seedling planting section 4, and to operate the fertilization transmission actuator 426 a in accordance with the operation of the planting clutch motor 24. However, when the seedling planting section 4 is lowered (at the time of planting operation), as shown in FIG. 5, the fertilizer transmission actuator 426a is turned on and off by the fertilizer transmission switch 428, and planting of the seedling and fertilization are performed independently. Configuration.

  When the switching shifter 324 is switched to one side, that is, the right side in FIG. 8 by the fertilization transmission actuator 426a, the fertilization transmission on / off member 422 is switched in the same direction, that is, the right side in FIG. 8, whereby the third clutch pawl 422b and the third Since the engagement of the four clutch pawls 425a is released, the driving force due to the rotation of the input shaft 321 is not transmitted to the third bevel gear 425. Therefore, the driving force is not transmitted to the fertilizer application device 5 side.

  On the other hand, as shown in FIG. 8, when the switching shifter 324 is switched to the other side, that is, the left side of FIG. 8 by the fertilization transmission actuator 426a, the fertilization transmission on / off member 422 is switched to the same direction, that is, the left side of FIG. Since the third clutch pawl 422b and the fourth clutch pawl 425a are fitted, the driving force due to the rotation of the input shaft 321 is transmitted to the third bevel gear 425. Then, the power transmitted by the rotation of the third bevel gear 425 is transmitted to the fourth bevel gear 412 fixed to the fertilizer transmission member 401. Thereby, the driving force is transmitted to the fertilizer application device 5 side.

  In addition, the right rear wheel gear case 200R and the left rear wheel gear case 200L may be arranged left and right. The right rear wheel gear case 200R is provided with a leveling clutch mechanism 320, and the left rear wheel gear case 200L is provided. A fertilizer transmission mechanism 420 may be provided.

  Then, in the rice transplanter 1, when the turning interlocking mechanism T functions during turning traveling, when the angle detecting member 162 detects that the entire area before and after the float 55 is at an angle that can be considered to be in contact with the field scene, The fertilizer application transmission actuator 426a of the fertilizer application device 5 switches the fertilizer transmission on / off member 422 to the on state, and the fertilizer application device 5 is driven. In addition, when the fertilizer application on / off member 422 is turned on, the blower electric motor 53 is also operated at the same time, thereby generating a fertilizer transport wind and improving the fertilizer transport efficiency.

  Further, when it is detected by the angle detection member 162 that the float 55 is separated from the field scene, that is, when the ground contact is not detected, the fertilization transmission on / off member 422 is turned off by the fertilization transmission actuator 426a, and the blower It is characterized in that the electric motor 53 operates in conjunction with it and the fertilizer application device 5 is not driven. FIG. 9 shows a flowchart at this time.

  When the angle detection member 162 detects that the float 55 is in contact with the field scene, the on / off state of the fertilization drive at that time is determined, and the state is maintained when the fertilizer application device 5 is operating. On the other hand, when the fertilizer application device 5 is not operating, the drive is switched to operate the fertilizer transmission actuator 426a.

  In addition, when the float 55 is not detected to be in contact with the field scene by the angle detecting member 162, that is, when the separation is detected, the on / off state of the fertilization drive at that time is determined, and the fertilizer device 5 is operated. If so, switch the drive to stop. On the other hand, when the fertilizer application device 5 is not operating, the state is maintained. The on / off state of the fertilization drive is determined by providing a sensor (not shown) for detecting the on / off state of the fertilization transmission on / off member 422 on the fertilization transmission on / off member 422, or by the on / off state of the fertilization transmission switch 428. And

  The angle at which the float 55 is considered to be separated from the field scene by the angle detection member 162 is, for example, -3 to 5 degrees when ± 0 degrees (reference value) when the entire area before and after the float 55 is in contact with the field scene. That is all. Since the vertical pivot of the float 55 is located at the rear of the float, this angle is expressed by a concept that the front end of the float 55 is minus when the front end falls below the reference value, and is plus when the front end rises.

  When the angle detection member 162 detects that the float 55 has separated from the field scene, the fertilizer device 5 stops, and when the seedling planting unit 4 starts to rise, the supply of fertilizer from the fertilizer device 5 stops. The release of the fertilizer at a position away from the surface is prevented, and unnecessary diffusion of the fertilizer is prevented.

  When the angle detecting member 162 detects that the float 55 has come into contact with the ground, the fertilizer applicator 5 is activated, so that the fertilizer applicator 5 is activated prior to the start of seedling planting after turning. Since the feeding of the fertilizer can be started, the fertilizer is supplied to the field at the start of planting of the seedling after turning. Therefore, the occurrence of a section where the fertilizer is not supplied is prevented. In addition, since the fertilizer is supplied while the float 55 is in contact with the ground, the fertilizer is not scattered in the air.

  Regarding the stop of the operation of the fertilizer device 5 when the seedling planting section 4 is raised, the planting operation on / off member 25ab that detects the on / off operation of the planting operation on / off member 25a is performed without using the angle detection member 162. When the cut-off state of the planting operation on / off member 25a is detected, the fertilizer application transmission actuator 426a may be turned off and the operation of the fertilizer device 5 may be stopped.

  By stopping the fertilizer device 5 after the planting device 52 in which the planting operation on / off member 25a is cut off, the seedling transplanter 4 transfers the fertilizer moving to the field scene from the fertilizer hose 62 of the fertilizer device 5. Since the fertilizer can be supplied to the field while ascending to the maximum position, it is possible to prevent the fertilizer from being supplied more than necessary at the start of the fertilizer supply after turning, and to prevent the supply of excess fertilizer.

  Also, when the seedling planting section 4 is lowered, as described above, when the angle detection member 162 detects that the float 55 is in the ground contact state, the fertilizer applicator 5 is operated to generate a section where no fertilizer is supplied. In addition, fertilizer is prevented from being spread and spread in the air.

  These controls are performed by the control device 163. The stop of the operation of the fertilizer application device 5 when the seedling planting section 4 is raised is determined based on the result detected by the angle detection member 162 or by the planting operation on / off member 25ab. Whether or not to be based on the detected result can be selected by the operator according to work conditions, field conditions, and the like by using a selection switch 432 provided on the operation panel 70 shown in FIG. When the selection switch 432 is operated to the left, it is based on the result detected by the angle detection member 162, and when it is operated to the right, it is based on the result detected by the planting operation on / off member 25ab.

  As described above, the fertilizer transmission mechanism 420 and the fertilizer transmission member 401 are provided on the left and right rear wheel gear case 200 (in the illustrated example, the right rear wheel gear case 200R), and the planting clutch case 25 and the planting are provided. A fertilization transmission mechanism independent of the planting transmission mechanism to the seedling planting section 4 via the transmission shaft 26 is configured.

  That is, since the drive of the fertilizer applicator 5 can be independently turned on and off, the start and end of the fertilizer supply can be operated regardless of the on / off of the planting device 52, so that extra fertilizer can be supplied, The occurrence of sections where no fertilizer is supplied is prevented.

  Note that a fertilization transmission switch 428 for turning on and off the fertilization transmission mechanism 420 is provided on the operation panel 70, and when the operator presses the fertilization transmission switch 428, the fertilization application device 5 can be operated by the fertilization transmission actuator 426a. .

  Then, based on the on / off operation of the fertilization transmission switch 428, the detection result by the angle detection member 162, the detection result by the planting operation on / off member 25ab, and the like, the fertilization transmission actuator 426a operates to turn on / off the fertilization transmission mechanism 420. By this (fertilizer application transmission function), the on / off of the fertilizer transmission mechanism 420 is easily automated, so that the work efficiency is improved and the on / off of the fertilizer device 5 is reliably performed.

  Then, as shown in FIG. 6, the fertilizer transmission member 401 for transmitting the driving force to the fertilizer application device 5 is disposed inside the body, that is, on the side opposite to the side where the rear wheel 11 is provided with reference to the right rear wheel gear case 200R. As a result, the mud which is flipped up by the rotation of the rear wheel 11 is received on the outer surface of the body of the right rear wheel gear case 200R, so that the mud is prevented from adhering to the fertilizer application transmission member 401.

  On the other hand, by arranging the fertilization transmission member 401 on the outside of the body, that is, by arranging the fertilization transmission member 401 on the rear wheel 11 side (right side) with reference to the right rear wheel gear case 200R, the worker can move the rear wheel 11 side, Maintenance of the fertilizer transmission member 401 and its surroundings can be easily performed from the outside of the machine body, so that maintenance workability is improved.

  Further, by disposing the fertilizer application transmission member 401 above the right rear wheel gear case 200R, the distance to the feeding portion 61 of the fertilizer application device 5 disposed on the traveling vehicle body 2 can be shortened. Can be suppressed.

  Further, when the fertilizer application actuator 426a is disposed above the right rear wheel gear case 200R and below the floor step 35, the mud that is flipped up by the rotation of the rear wheel 11 hardly reaches the fertilizer transmission member 401, and the fertilizer transmission member Adhesion of mud to 401 is prevented.

  In addition, a rod (not shown) is attached to the lower link 41 of the lifting link mechanism 3, and the rod is connected to the root 324bR of the switching shifter 324R via the cable 427, so that the on / off operation of the fertilization transmission on / off member 422 is performed. It may have a function to perform.

  Further, a manual operation member 426 may be attached to the fertilizer application transmission member 401 so that the fertilizer can be manually fed. FIG. 8 shows a configuration in which the fertilization transmission member 401 protrudes inside the body of the right rear wheel gear case 200R (that is, on the left side). When the manual operation member 426 is attached to the protrusion, the supply of the fertilizer of the fertilizer application device 5 can be manually operated.

  The fertilizer supplied by the fertilizer applicator 5 is changed by an operator according to the components in the field and the crop to be cultivated, but the specific gravity of the fertilizer varies depending on the components. Thus, even if the setting of the fertilizer supply amount of the fertilizer application device 5 is the same, the amount of the actually supplied fertilizer may increase or decrease compared to the setting, and the supply of the fertilizer to the field may be reduced. Excess or deficiency in volume may occur. In order to prevent this, a so-called “trial feeding” operation is performed in which the fertilizer 5 is operated before planting seedlings in the field and the amount of fertilizer released from the fertilizer 5 within a predetermined time is confirmed. It is necessary to set the supply of fertilizer to an amount suitable for the working conditions.

  On the other hand, the fertilizer applicator 5 is configured not to be driven unless the seedling planting unit 4 is driven. Therefore, when performing the “trial feeding” operation, the fertilizing device 5 is performed before placing the seedling on the seedling planting unit 4 or once. It is necessary to remove the seedlings from the planting section 4, and there is a problem that extra work time is spent. Further, when the seedlings are placed on the seedling planting section 4, there is a problem that the seedlings are scraped off at the time of trial feeding and the seedlings are consumed extra. Further, since the engine needs to be operated, there is a problem that extra fuel is consumed and fuel efficiency is reduced.

  However, as described above, if one end of the fertilizer transmission member 401 is protruded to the right from the right rear wheel gear case 200R, and the manual operation member 426 is attached to this protruding portion, the “ A “trial feeding” operation can be performed.

  Accordingly, when the operator performs the “test feeding” operation by the manual operation using the manual operation member 426, unnecessary fuel consumption of the traveling vehicle body 2 is suppressed, and the fuel efficiency is improved.

  Further, by providing the manual operation member 426 near the right rear wheel gear case 200R, the supply distance of the driving force to the fertilizer device 5 at the rear of the machine body can be shortened, so that the transmission loss of the driving force is small and the operation efficiency is small. Is improved, and the force for operating the manual operation member 426 is reduced, so that the labor of the operator is reduced.

  When the rear wheel 11 on the right rear wheel gear case 200R on which the fertilizer transmission member 401 is provided makes a turning movement inside the turning inside, the rear wheel on the left rear wheel gear case 200L side without the fertilizer transmission member 401 is provided. The configuration is such that the operation timing of the fertilization application actuator 426a after the turn is earlier than when the turn 11 is inside the turn.

  During turning, the steering mechanism S disengages the side clutch 87 inside the turn, so that the transmission of the driving force to the right rear wheel gear case 200R located inside the turn is cut off. Therefore, when turning to the right where the fertilization transmission member 401 is provided, the rotation speed of the fertilization transmission member 401 when the fertilization transmission on / off member 422 is in the on state is lower than when turning to the left. However, there is a problem that the timing at which the fertilizer application device 5 operates is delayed, the supply start position of the fertilizer changes depending on the turning direction, and a position where the fertilizer is not supplied occurs.

  However, by setting the operation timing of the fertilizer transmission actuator 426a after turning to the right to be earlier than the operation timing after turning to the left, the number of rotations to start fertilization transmission after turning can be ensured. Supply start timing can be stabilized, and the occurrence of a section where no fertilizer is supplied can be prevented.

  In the above description, since the fertilization transmission member 401 is provided on the right rear wheel gear case 200R, the operation timing of the fertilization transmission actuator 426a is earlier when turning right than when turning left (for example, 3 The control is performed by the control device 163. Specifically, during the right turn, the on-time of the rotation pulse of the fertilizer transmission member 401 after the float 55 contacts the ground than at the left turn is set shorter, and the fertilizer transmission actuator 426a is activated at an earlier timing to transmit the fertilizer. The on / off member 422 is set to the on state.

  During the right turn, the output rotation speed of the fertilization drive to the right rear wheel gear case 200R decreases in conjunction with the disengagement of the right side clutch 87. Although there is a tendency to be delayed, this configuration allows the drive of the fertilizer application device 5 to be constant regardless of the turning direction.

  When the operator neutralizes the sub-transmission switching member 17 along the lever guide 17a, the sub-transmission operation position detecting member 17b detects that the sub-shift operation member 17 has been operated to the neutral position N, as shown in FIG. Then, the operation of the planting device 52 is stopped by operating the planting clutch motor 24 to the off side by the control device 163 to put the planting operation on / off member 25a in the off state (stop function). On the other hand, when the sub-transmission changeover operation member 17 is operated to the stop planting position W beside the neutral position, the supply of the driving force to the left and right front wheels 10, 10 and the left and right rear wheels 11, 11 of the traveling vehicle body 2 is stopped. In this state, the planting device 52 can be operated. This is referred to as "stop planting work".

  At the stop planting position W, a stop planting position detecting member 430, which is a sensor switch, is provided. When the sub-shift-switching operation member 17 comes into contact, a signal is input to the control device 163 by being turned on. Then, a signal for operating the planting clutch motor 24 to the input side is output from the control device 163, and the planting operation on / off member 25a is turned on, and the planting device 52 is operated. This is called a stop planting function.

  The auxiliary speed change operation member 17 is constantly urged from the stop planting position W to the neutral position N side by an urging member such as a torque spring (not shown), and when the operator releases the auxiliary speed change operation member 17. The structure is such that it immediately returns to the neutral position N. Accordingly, if the operator does not intentionally operate the sub-transmission switching operation member 17 to the stop planting position W, the auxiliary transmission switching operation member 17 is not detected by the stop planting position detection member 430, and the planting device 52 is Does not work.

  FIG. 10 is a plan view showing a transmission mechanism for driving wheels in the transmission case 12. Although the actual transmission shafts are not arranged on the same plane, they are displayed on the same plane to explain the transmission mechanism. In FIG. 10, the upper direction of the drawing is the right side of the vehicle body, and the lower direction is the left side of the vehicle body.

  The transmission case 12 receives the rotational power from the continuously variable transmission 23 on the transmission input shaft 583, and drives the right and left front wheels 10 and 10 and the right and left rear wheels 11 via the auxiliary transmission 571, the differential device 585, and the like. , 11 are driven.

  The auxiliary transmission 571 has a mechanism for switching the traveling state of the traveling vehicle body 2 between “planting operation speed”, “road speed”, and “running neutral”, and has an auxiliary transmission switching shaft 572 that rotates at the rotation speed after the shift. A switching member 573 fitted to the auxiliary transmission switching shaft 572, a planting speed transmission member 574, a road speed transmission member 575, and a relay shaft 576. The change of the traveling state is performed by changing the ratio of the rotation speeds of the relay shaft 576 and the sub-transmission switching shaft 572. The auxiliary transmission switching shaft 572 and the switching member 573 are configured to be operable in the axial direction of the auxiliary transmission switching shaft 572 by spline processing, and the operator operates the auxiliary transmission switching operation member 17 to operate the switching member 573. The traveling state of the traveling vehicle body 2 is switched.

  The relay shaft 576 has two gears having different diameters, one of which receives the rotational power from the transmission input shaft 583. Among the two gears, the one having the larger diameter is the road speed transmission member 575, and meshes with the gear of the switching member 573 when the operation position of the sub-transmission switching operation member 17 is "road speed". The small diameter member always meshes with the planting speed transmission member 574. By this meshing, the relay shaft 576 transmits power to the planting speed transmission member 574 and the road speed transmission member 575.

  The planting speed transmission member 574 meshes with a gear having a small diameter of the relay shaft 576, and is provided on the right side on the same axis as the sub-transmission switching shaft 572. The planting speed transmission member 574 and the auxiliary speed changeover switching shaft 572 are configured to be relatively rotatable by a metal bearing. Further, a main planting transmission shaft 582 that transmits a driving force to the planting portion 4 is coaxially and rotatably coupled to the planting speed transmission member 574. This allows the main planting transmission shaft 582 to rotate coaxially with the auxiliary transmission switching shaft 572 and to rotate relative to each other.

  On the right side of the switching member 573, there is provided a meshing portion of a pawl clutch connected to the planting speed transmission member 574, and teeth on the outer periphery are formed to mesh with the road speed transmission member 575.

  A part of the rotational power from the auxiliary transmission switching shaft 572 is distributed and transmitted to the left and right front wheel axles 584, 584 by the differential device 585, and further transmitted to the front wheel final cases 13, 13 by the front wheel axles 584, 584 to be transmitted to the front wheels 13, 13. 10 and 10 are driven. Then, rear wheel drive power taken out from the rear surface of the transmission case 12 via the left and right front wheel axles 584, 584 is transmitted to the rear wheel gear cases 200L, 200R via the rear wheel transmission shafts 230L, 230R. The wheels 11, 11 are driven. In the transmission case 12, a brake device 581 for restricting the rotation of the front wheels 10, 10 and the rear wheels 11, 11 is provided on the left side of the auxiliary transmission switching shaft 572.

  FIG. 11 is a view for explaining the operation of the auxiliary transmission mechanism in the transmission case 12 of FIG. FIG. 11A shows an engagement diagram when the operation position of the sub-transmission switching operation member 17 is “road speed”, and FIG. 11B shows that the operation position of the sub-transmission switching operation member 17 is “neutral”. FIG. 11 (c) shows a meshing diagram when the operation position of the sub-shift-switching operation member 17 becomes the "planting work speed". In FIG. 11 as well, the upward direction in the drawing is the right side of the vehicle body, and the downward direction is the left side of the vehicle body.

  In the case of "road speed", the teeth on the outer periphery of the switching member 573 mesh with the teeth of the road speed transmission member 575 of the relay shaft 576. With this configuration, rotational power is transmitted to the switching member 573, and the sub-transmission switching shaft 572 meshing with the switching member 573 by a spline rotates together with the switching member 573, and is provided by the gear located on the left side of the switching member 573 by the differential gear 585. To transmit rotational power.

  At this time, although the planting speed transmission member 574 is rotated by the relay shaft 576, it rotates at a rotation speed different from that of the sub speed changeover switching shaft 572 that is relatively rotatable.

  When “neutral”, the switching member 573 does not mesh with any of the planting speed transmission member 574 and the road speed transmission member 575. Although the planting speed transmission member 574 is rotated by the relay shaft 576, the auxiliary speed changeover switching shaft 572 to which no rotational power is transmitted remains stopped. At this time, since the planting speed transmission member 574 and the planting main transmission shaft 582 are coaxially and rotatably connected, only the seedling planting section 4 can be operated. The same mechanism is used when the sub-transmission switching operation member 17 is operated to the stop planting position W.

  At the time of the "planting operation speed", the right side of the switching member 573 is meshed with the left side of the planting speed transmission member 574 by a pawl clutch and connected to each other. The planting speed transmission member 574 is rotated by the relay shaft 576, the switching member 573 connected by the pawl clutch is rotated, and the sub-transmission switching shaft 572 meshed with the switching member 573 by a spline is rotated, so that the rotational power is increased. Is transmitted from the relay shaft 576 to the auxiliary transmission switching shaft 572, and the rotational power is transmitted to the differential device 585 by the gear located on the left side of the switching member 573.

  When the sub-shift-switching operation member 17 is at the neutral position N, the transmission is transmitted to the seedling planting portion 4. However, the transmission to the seedling planting portion 4 is performed because the planting operation on / off member 25a is cut off. Is shut off.

  Therefore, even when in the neutral position N, if the planting operation on / off member 25a is connected, that is, if the planting operation on / off member 25a is in the on state, the seedling planting section 4 is in the driving state. Thereby, when the sub-transmission changeover operating member 17 is operated to the stop planting position W, the planting operation on / off member 25a is in the on state while maintaining the above-mentioned "running neutral" state. In the stopped state, the planting device 52 operates.

  FIGS. 12 to 15 show transmission mechanism diagrams (schematic diagrams) corresponding to the operation positions of the sub-shift-switching operation member 17.

  When the operation position of the sub-transmission switching operation member 17 shown in FIG. 12 is at the road speed and at the planting operation speed shown in FIG. 13, the gear mechanism of the sub-transmission 571 is different between the high-speed side and the low-speed side. The other running systems, planting systems, fertilizing systems, etc. all have the clutch engaged. However, when traveling on the road, the operation is basically a non-operational travel, so the seedling planting section 4 is raised, and the planting operation on / off member 25a, the fertilization transmission on / off member 422, and the leveling rotor on / off clutch 322 are It will be turned off.

  When the operation position of the sub-transmission switching operation member 17 shown in FIG. 14 is neutral, power is not transmitted to the traveling system, so that no driving force is transmitted to the ground control system or fertilizer application system on the lower side of the transmission. Further, since the planting operation on / off member 25a is also in the off state, the traveling is stopped, and the planting device 52, the fertilizer application device 5, and the like are not operated.

  On the other hand, when the operation position of the sub-transmission switching operation member 17 shown in FIG. 15 is at the stop and planting, the transmission to the traveling system is turned off as in the case of neutral, but the planting operation on / off member 25a is Since it is in the on state, the power from the engine 20 is transmitted to the planting system, and the planting device 52 operates. Since the power is not transmitted to the traveling system, the driving force is not transmitted to the fertilizer application system or the ground leveling system that branches off from the right rear wheel gear case 200R.

  As described above, when the auxiliary transmission switching operation member 17 is operated to the stop planting position W, planting work can be performed in a state where traveling is stopped. The planting of the plant can be carried out, the workability is excellent, and there is no need to manually replant the seedlings, so that the labor of the worker is reduced.

  At the beginning of planting seedlings, when the planting device 52 does not match the position where the first plant is planted with the planting end position of the adjacent streak, the planting can be planted without moving from the place, Seedling planting accuracy is improved. In particular, when the body turns 90 ° at the corner of the field, the position is easily disturbed, and the seedlings can be reliably planted at a position where the seedlings can be planted.

  Normally, you have to travel when planting seedlings, so to plant the seedlings without moving from the place, it is necessary to quickly start, stop and plant and cut off the operation, it is difficult for non-experts, With this configuration, anyone can easily plant seedlings.

  However, if the planting operation of the seedling is performed in a state where the float 55, the middle floats 57, 57 and the side floats 56, 56 are not in contact with the ground, the seedling planting tool 52a operates above the field scene, and the seedling is removed. It may be dropped. Therefore, if the angle detection member 162 does not detect that the float 55 has come into contact with the ground, the planting device 52 does not operate even if the sub-transmission switching operation member 17 is operated to the stop planting position W. This is called a stop planting invalidation function.

  With this configuration, it is possible to prevent the seedlings from being dropped above the field scene due to an erroneous operation, so that consumption of unnecessary seedlings is prevented.

  Also, by enabling the stop planting function and the stop planting disabling function in the rotation interlocking mode, planting the seedlings in the air when turning around the ridge, that is, separating the seedlings above the field scene, etc. Erroneous operation of the planting device 52 can be prevented. This flowchart is shown in FIG.

  The sub-transmission changeover operation member 17 is detected by the stop planting position detecting member 430 to be at the stop planting position W (precondition). At this time, the turning interlock switch 90 is in the turning interlocking mode, and the float 55 is in the turning interlocking mode. When the angle detecting member 162 detects that the vehicle is in the ground contact state, the stop planting function is enabled (permitted), and a signal for operating the planting clutch motor 24 to the entrance side is output from the control device 163, and the planting is performed. The attached operation on / off member 25a enters, and the seedlings are planted.

  On the other hand, when not in the turning interlocking mode or when the float 55 is in the separated state, the stop planting function does not work (prohibited), and the control device 163 outputs a signal for operating the planting clutch motor 24 to the cutting side, Since the planting operation on / off member 25a is cut, planting of the seedling is not performed.

  As described above, whether the planting operation (stop planting operation) in a state where the traveling of the traveling vehicle body 2 is stopped is determined based on the condition that the float 55 is grounded can prevent a decrease in work efficiency.

  The stop planting function does not operate when the brake pedal 110 is operated as shown in FIG. 1, and the planting device 52 does not operate even if the sub-transmission switching operation member 17 is operated to the stop planting position W. Good. This flowchart is shown in FIG.

  The amount of operation of the brake pedal 110, that is, the amount of depression is detected by a brake pedal sensor 110a provided at the base of the brake pedal 110 shown in FIG. The brake pedal sensor 110a may be of a type that makes contact when depressed to some extent, but may be a stroke sensor or the like. When the brake pedal 110 is depressed, the stop planting function does not work, so that an erroneous operation when the rice transplanter 1 is stopped can be prevented, which is safe.

  Further, in the rice transplanter 1, the trunnion shaft electric motor 103 (FIG. 5) is driven in the forward or reverse direction by the operation of the main transmission switching operation member 16 to switch the output of the continuously variable transmission 23 (the continuously variable transmission). 23 by changing the rotation speed and rotation direction of the output shaft of the output shaft 23), and a trunnion shaft electric motor according to the operation position of the main speed changeover operation member 16 detected by the main speed change operation amount detection member 16b. The configuration is such that a drive command signal is output to the signal 103. The trunnion shaft actuator 103 is provided outside the continuously variable transmission 23, and operates in conjunction with the operation amount of the main transmission switching operation member 16 detected by the main transmission operation amount detecting member 16b.

  Then, the trunnion shaft actuator 103 operates a trunnion arm (not shown) that is directly connected to the trunnion shaft 295 to rotate the trunnion shaft 295, and rotates until the rotation angle of the trunnion shaft 295 reaches a predetermined angle. Let it. The turning direction and the turning angle of the trunnion shaft 295 are detected by a trunnion shaft detection member 113 provided on the trunnion arm.

  When the angle detection member 162 detects that the float 55 is in the ground contact state when the turning interlock switch 90 is in the turning interlocking mode, the operation position of the main shift switching operation member 16 shown in FIG. May be in the neutral position 16aa and the trunnion shaft 295 may be in the neutral position to enable the stop planting function. This is called a stop planting neutral function. This flowchart is shown in FIG.

  The turning interlocking switch 90 is in the turning interlocking mode, and the angle detection member 162 detects that the float 55 is in the ground contact state, and the main transmission switching operation member 16 is detected by the main transmission operation amount detecting member 16b. When the operation position is the neutral position and the trunnion shaft detecting member 113 detects that the trunnion shaft 295 is in the neutral position, the stop planting function is enabled (permitted), and the sub-transmission switching operation member 17 is turned off. When the operation is switched to the stop planting position W, the planting operation on / off member 25a is in the on state, and the planting of the seedlings is performed.

  On the other hand, when the operation position of the main transmission switching operation member 16 detected by the main transmission operation amount detection member 16b is not the neutral position 16aa, or the rotation direction and rotation of the trunnion shaft 295 detected by the trunnion shaft detection member 113. When the neutral position is not the neutral position 16aa from the angle, even if the sub-transmission switching operation member 17 is operated to the stop planting position W, the stop planting function does not work (prohibition), and the planting operation on / off member 25a is in the off state. Therefore, seedlings are not planted.

  As described above, since the planting operation is not performed unless the traveling of the traveling vehicle body 2 is completely stopped, the malfunction of the planting device 52 can be prevented. For example, during the planting operation (during work traveling), the sub-transmission switching operation member 17 is operated to the stop planting position W due to an erroneous operation, and the sub-transmission switching operation member 17 contacts the stop planting position detection member 430. No change occurs in the seedling planting operation traveling even if the operation is performed in the above manner, so that a decrease in work efficiency and seedling planting accuracy due to erroneous operation is prevented.

  Further, the planting of the seedlings at this time may be performed by turning the planting operation on / off member 25a into the on state after the trunnion shaft 295 has reached a predetermined angle. This flowchart is shown in FIG.

  That is, when the operation position of the main transmission switching operation member 16 detected by the main transmission operation amount detection member 16b is the neutral position and the trunnion shaft 295 detected by the trunnion shaft detection member 113 is the neutral position, the stop is performed. A signal is output from the control device 163 to activate the planting clutch motor 24 to make the planting function valid. The operation signal of the planting clutch motor 24 is determined by the control device 163 to enable the stop planting function, and an operation signal is output to the trunnion shaft actuator 103 so that the trunnion shaft 295 has a predetermined angle (target value). It is a configuration that is output after it. Then, the fertilizer transmission actuator 426a is operated to bring the fertilizer transmission on / off member 422 into the on state. This is called a stop planting operation function.

  By supplying the driving force to the planting device 52 after increasing the output of the continuously variable transmission 23 to a predetermined value, the planting device 52 can be reliably operated in a stopped state. Accuracy of application and fertilization are improved.

  First, if the flow of the processing is such that the planting operation on / off member 25a is turned on and then output to the trunnion shaft actuator 103 of the trunnion shaft 295, the rotation speed of the seedling planting tool 52a of the planting device 52 gradually increases. Control operation, and the operation is not stable. However, according to this configuration, by first outputting to the trunnion shaft actuator 103 and then turning the planting operation on / off member 25a into the on state, the rotation speed of the seedling planting tool 52a rotates smoothly from the beginning. Stabilize.

  That is, when the output of the continuously variable transmission 23 is increasing, the rotation speed of the seedling planting tool 52a also increases stepwise, so that the operation of the seedling planting tool 52a becomes unstable. As described above, when the output of the continuously variable transmission 23 has reached a constant value, the rotational speed of the seedling attachment 52a is relatively quickly stabilized, so that the movement is smooth.

  Further, after the trunnion shaft 295 has reached the target value, during the on-off process of the planting operation on / off member 25a when outputting a signal for operating the planting clutch motor 24 on the inward side, the planting operation on / off operation is performed. If the control is stopped before the member 25a enters the engaged state (corresponding to "between" continuously variable transmission forward output "and" planting delay timer up "in FIG. 22 described later), the planting clutch motor 24 is turned off. The operation signal is output to the side, and the planting operation on / off member 25a is turned off. When the control is stopped, the ON time of the stop planting position detecting member 430, that is, the time during which the sub-transmission switching operation member 17 is pressed to the stop planting position W is measured by a timer (not shown), and the time is too short. and so on.

  Even when the planting operation on / off member 25a is in the on-process, when the control is stopped, the planting operation on / off member 25a is returned to the off state, and the sub-transmission switching to the stop planting position detecting member 430 is performed. The planting operation on / off member 25a is prevented from being turned on and off each time the operating member 17 is hit, and a malfunction is prevented.

  When the control is stopped during the implantation process of the planting operation on / off member 25a and the planting operation on / off member 25a is turned off, the planting operation on / off member is turned off after the planting operation on / off member is turned off. After the seedling tool 52a is rotated (rotated by inertia) for a time (for example, about 0.5 to 2 seconds), the seedling tool 52a is output to the trunnion shaft actuator 103 and the trunnion shaft 295 is set to the previous target value (stop planting operation). In such a configuration, the output of the continuously variable transmission can be secured at the time, and the neutral position is set from the rotation position of the trunnion arm).

  When the planting operation on / off member 25a is turned off after the trunnion shaft 295 is set to the neutral position, the stopping position becomes the position at that time because the driving force is not supplied to the seedling planting tool 52a. The seedling attachment 52a does not stop at the position.

  Then, after the planting operation on / off member 25a is turned off, the seedling planting tool 52a is rotated for a predetermined time, so that the seedling planting tool 52a stops at the regular stop position. This regular stop position is designed by a combination of gears inside the seedling attachment 52a. Therefore, the stop position of the seedling attachment 52a is stabilized.

  After the planting operation on / off member 25a is turned off and the trunnion shaft 295 is set to the neutral position, the planting clutch motor 24 is operated to put the planting operation on / off member 25a on. deep. The operator sometimes forgets to insert the planting operation on / off member 25a when resuming the work after operating the auxiliary transmission switching operation member 17 to the stop planting position W and planting only one plant. However, since the planting operation on / off member 25a is automatically turned on after the stop planting work, the work can be resumed just by traveling at the planting speed.

  Further, a specific flowchart of the stop planting function when the sub-transmission switching operation member 17 is operated to the stop planting position W is shown below.

  FIG. 20 shows a rough flowchart of the processing by the stop planting function. This process includes five types of the stop planting processes 0 to 4, and is performed in the order of the stop planting processes 0 to 1, 2, 3, and 4. 21 shows a flow of the stop planting process 0, FIG. 22 shows a flow of the stop planting process 1, FIG. 23 shows a flow of the stop planting process 2, and FIG. FIG. 25 shows a flow of the stop planting process 3 and FIG. 25 shows a flow of the stop planting process 4.

  In the stop planting process 0 of FIG. 21, when the operation position of the main transmission switching operation member 16 is the neutral position and the operation position of the sub transmission switching operation member 17 is also the neutral position, the stop planting function is effective. (Permission), the device enters the standby state. Then, when the stop planting position detecting member 430 detects that the sub-transmission switching operation member 17 has been operated to the stop planting position W, the stop planting process 1 is set. Then, the planting delay timer of the signal for operating the planting clutch motor 24 is set from the control device 163 (a predetermined time, for example, 1 second), and then the flow proceeds to the flow of the stop planting process 1 in FIG.

  In the stop planting process 1, the trunnion shaft actuator 103 is rotated forward (forward), and the trunnion shaft 295 of the continuously variable transmission 23 is rotated. At this time, the position of the main transmission switching operation member 16 remains at the neutral position, and only the trunnion shaft 295 is rotated forward by the trunnion shaft actuator 103, so that power is transmitted to the seedling planting section 4. Become.

  Then, when the set time of the previous planting delay timer has elapsed (timer up), the stop planting process 2 is set, and the planting operation on / off member 25a enters the working time (for example, 1 to 2 seconds). Is set, and a signal for operating the planting clutch motor 24 is output from the control device 163. Then, the process proceeds to the flowchart of the stop planting process 2 in FIG.

  In the stop planting process 2, the stop planting process 3 is set when the planting clutch motor 24 is operated and the planting operation on / off member 25a is turned on, and then the flowchart of the stop planting process 3 in FIG. Move on to Then, in the stop planting process 3, after the previous operation time has elapsed (timer up), the stop planting process 4 is set, and after the planting operation on / off member 25a is turned off, the trunnion shaft 295 is set to the neutral position. After setting the time to return (for example, 1 to 2 seconds), the planting operation on / off member 25a is turned off, and then the flow shifts to the flowchart of the stop planting process 4 in FIG.

  In the stop planting process 4, when the time required to return the previous trunnion shaft 295 elapses, the trunnion shaft 295 rotates from the forward side to the stop side, and then returns to the neutral position, thereby ending the flowchart.

  FIGS. 26 and 27 below show the overall flow of the above flowcharts. The stop planting operation is completed when the seedling planting tool 52a of the planting apparatus 52 stops after one rotation or when the time to finish planting the seedling has elapsed, and when the operation of the sub-transmission switching operation member 17 is stopped halfway. FIG. 26 shows the former flowchart, and FIG. 27 shows the latter flowchart. FIG. 27 shows not only the latter but also the overall flow.

  In FIG. 26, when the trunnion shaft 295 of the continuously variable transmission 23 is rotating forward or backward, and the stop planting process is not being performed, a normal continuously variable transmission output process is performed. That is, a driving force corresponding to the operation position of the main shift switching operation member 16 is output. On the other hand, when the stop planting process is being performed (any of the above processes 0 to 4), and the trunnion shaft 295 is outputting the trunnion shaft 295 to the stop side by the trunnion shaft actuator 103 (“stepless speed change” in FIG. The device stop output is determined by determining whether or not the trunnion shaft 295 is at the neutral position, and when the trunnion shaft detection member 113 detects that the trunnion shaft 295 is at the neutral position, the stop planting process is performed. finish.

  Then, after the stop planting process is completed, it is determined whether or not the stop planting process 4 has already been performed. If the stop planting process 4 has already been performed, the planting clutch motor 24 operates to perform the planting. The attached operation on / off member 25a is in the on state. In the state of FIG. 26, the seedlings are basically normally planted, so that the process is shifted to the normal planting operation after the termination of the stop planting process. At this time, if the planting operation on / off member 25a remains in the off state, the planting start may be delayed at the start of traveling, so a step of finally switching the planting operation on / off member 25a to the on state is included. .

  By setting the planting operation on / off member 25a to the on state, the sub speed changeover operating member 17 is operated to the position of the planting operation speed and the main speed changeover operating member 16 is operated to the forward side, so that the planting is immediately performed. You can start working. Thereafter, the stop planting process 0 is set, and the next stop planting process is reset so that it can be started from the stop planting process 0.

  If the trunnion shaft 295 is output to the forward side (or the reverse side) even during the stop planting process, the trunnion shaft 295 is output up to a certain opening (the previous target value).

  In FIG. 27, first, during the stop planting process in which the sub-transmission switching operation member 17 is operated to the stop planting position W, the sub-transmission switching operation member 17 comes off the stop planting position W and the stop planting position detecting member 430. When it is detected that the planting is not at the stop planting position W, it is determined which stage the stop planting process at that time is.

  At this time, if the stop planting process 1 is in progress, the stop planting process 0 is set, and the trunnion shaft 295 is output to the stop side by the trunnion shaft actuator 103 ("the stepless transmission stop output" in FIG. 25). Equivalent). On the other hand, when the stop planting process is not the stop planting process 0, it is determined whether or not it is the stop planting process 2 or 3, and when the stop planting process is the stop planting process 2 or 3, the planting operation on / off member After the 25a is turned off (corresponding to “planting operation on / off member cutting output” in FIG. 24), the stop planting process 0 is set, and the trunnion shaft actuator 103 outputs the trunnion shaft 295 to the stop side.

  FIG. 28 shows a configuration of a hydraulic circuit of the continuously variable transmission 23 of the rice transplanter 1 of the present embodiment, FIG. 29 shows a side sectional view of the continuously variable transmission 23, and FIG. 2 shows a plan sectional view of the transmission 23. FIG.

  As shown in FIG. 28, a variable displacement hydraulic pump that adjusts the amount and direction of hydraulic oil discharged by reciprocating motion of a plurality of pistons 248 arranged in parallel in conjunction with an input shaft 274 that inputs power from the engine 20. A and a fixed displacement hydraulic motor B for changing the rotation speed and direction of the output shaft 275 in accordance with the amount of oil discharged from the hydraulic pump A and the direction of oil discharge via the hydraulic closed circuits 266 and 267. The transmission 23 is configured.

  As shown in FIGS. 29 and 30, a part of the hydraulic closed circuits 266 and 267 is provided inside, and a port block 271 is disposed in a direction orthogonal to the input shaft 274 and the output shaft 275. The hydraulic closed circuits 266 and 267 are formed by connecting between the inside of the block of the hydraulic pump side cylinder 247a containing the pump A and the inside of the block of the hydraulic motor side cylinder 247b containing the hydraulic motor B.

  A closed circuit is formed by the hydraulic circuit 266 and the hydraulic circuit 267 shown in FIG. 28. When the swash plate 69 on the variable displacement hydraulic pump A side shown in FIG. The hydraulic pressure acting on the positive displacement hydraulic motor B becomes high. At this time, the hydraulic circuit 267 on the opposite side of the hydraulic circuit 266 becomes low pressure, and the oil discharged from the fixed displacement hydraulic motor B side becomes the variable displacement hydraulic pump A. Inhaled to go.

  A continuously variable transmission case 272 in which a variable displacement hydraulic pump A and a fixed displacement hydraulic motor B are housed and a case of a boost pump 273 (see FIG. 28) are integrated with the port block 271 shown in FIGS. And an input shaft 274 and an output shaft 275 whose axial directions are parallel to each other. A hydraulic pump A and a trochoid rotor (not shown) of the boost pump 273 are provided around the input shaft 274, and a hydraulic motor B is provided around the output shaft 275.

  In the hydraulic pump A and the hydraulic motor B, a large number of cylinders 247 are arranged around the input shaft 274 and the output shaft 275 in parallel with the axial direction to form a cylinder block. A moving piston 248 is provided. Each of the pistons 248 has its tip end swingably supported by each ball joint of the joint disc 277 and is provided rotatably around the shafts 274 and 275 with respect to the thrust plate 278 of the swash plate 69.

  The boost pump 273 supplies oil from the tank port T to the hydraulic circuits 266 and 267, and passes through an oil filter 280, a main relief valve 281, field valves (check valves) 282a and 282b, a neutral valve 283, and the like. It communicates with the hydraulic circuits 266, 267. A high-pressure relief valve 285 is provided between the two hydraulic circuits 266 and 267.

  The trunnion shaft 295 is provided in a direction orthogonal to the input shaft 274, and a pin slider 298 of a crank arm 296 integrated with the trunnion shaft 295 is provided at a tip of the trunnion shaft 295 in a roller groove 69 a formed in the swash plate 69. In addition, the trunnion shaft 295 operates the trunnion shaft actuator 103 to rotate the trunnion arm, thereby swinging the pin slider 298 and adjusting the inclination angle of the swash plate 69.

  When the angle of the swash plate 69 is changed by rotating the trunnion shaft 295, the pressing position of the piston 248 changes, and the hydraulic pump A switches between high pressure and low pressure.

  FIG. 31 shows an enlarged view of the piston 248. Generally, as shown in FIG. 31 (a), a dome-shaped piston is used. However, if the R dimension at the tip of the piston is small, the surface pressure is increased and the strength is weakened. There is a problem that the reaction force of the swash plate 69 increases and the operation load of the trunnion shaft 295 increases.

  Therefore, as shown in FIGS. 31 (b) and (c), the piston 248a on the hydraulic pump A side uses a piston having a small R dimension to reduce the operation load of the trunnion shaft 295 by the trunnion shaft actuator 103, and to always maintain a constant angle. It is preferable that the piston 248b on the hydraulic motor B side which comes into contact with the joint disc 277 has a large strength by using a piston having a large R dimension.

  FIG. 31B shows the piston 248a on the hydraulic pump A side, and FIG. 31C shows the piston 248b on the hydraulic motor B side. For example, the R dimension of the piston 248a is 24 (mm), and the R dimension of the piston 248b is 28 (mm).

  Normally, the piston 248a of the hydraulic pump A and the piston 248b of the hydraulic motor B use the same shape piston, but the R dimension of the tip of the piston 248 is changed between the hydraulic pump A side and the hydraulic motor B side as described above. By doing so, the following effects are exhibited.

  That is, with respect to the hydraulic pump A side, the contact position between the joint disk 277 and the R portion at the tip of the piston 248a fluctuates due to the movement of the swash plate 69. A small piston having a small R dimension is adopted. On the hydraulic motor B side, the joint disc 277 and the R portion at the tip of the piston 248b are always in contact at a constant angle. By using a piston having a large size, the operation load of the trunnion shaft 295 is light and the continuously variable transmission 23 with high pressure resistance can be provided.

  FIG. 32 shows another example different from the piston 248 of FIG.

  As shown in FIG. 32A, a spiral groove 248c may be provided on the outer peripheral surface (side surface) of the piston 248. In the case of the dome-shaped piston, if the sliding portion U on the side surface breaks the oil film, a problem such as abnormal wear or seizure occurs between the dome-shaped piston and the cylinder block. However, it is necessary to provide a spiral groove on the outer peripheral surface. This facilitates the formation of an oil film and prevents these problems.

  That is, the working oil is introduced into the groove 248c in accordance with the back and forth movement of the piston 248, thereby promoting the formation of an oil film and preventing a problem such as abnormal wear.

  The shape of the groove is not limited to a spiral shape, but may be a lattice-like groove 248d as shown in FIG. 32 (b) or a wedge-like groove 248e as shown in FIG. 32 (c). The piston 248 shown in FIG. 32 is common to both the piston 248a of the hydraulic pump A and the piston 248b of the hydraulic motor B.

  INDUSTRIAL APPLICABILITY The present invention is applicable to a riding type seedling transplanter equipped with a fertilizer application device and a seedling planting section.

2 Running vehicle body 4 Seedling plant 5 Fertilizer application device 10 Front wheel 11 Rear wheel 16 Main transmission switching operation member 16b Main transmission operation position detecting member 17 Switching operation member (sub transmission switching operation member)
Reference Signs List 20 engine 23 continuously variable transmission 25a planting operation on / off member 34 turning operation member 55 float 87 side clutch 103 trunnion shaft electric motor 113 trunnion shaft detection member 162 angle detection member 163 control device 200L rear wheel gear case 200R rear wheel gear case 205 rear Wheel rotation sensor 295 Trunnion shaft 401 Fertilization application transmission member 422 Fertilization application on / off member 426a Fertilization application actuator 428 Fertilization application switch 430 Stopping planting position detection member 571 Switching device (sub-transmission device)
S Steering mechanism T Turning interlocking mechanism

Claims (2)

Rear wheels (11, 11) are provided on the left and right sides of the traveling vehicle body (2), and a seedling planting part (4) is provided at the rear part so as to be able to move up and down. ), A fertilizer device (5) for supplying fertilizer to a field, an angle detecting member (162) for detecting a rotation angle of the float (55), and an interlocking movement of the traveling vehicle body (2). A seedling transplanter equipped with a turning interlocking mechanism (T) for switching between raising and lowering the seedling planting section (4) and operating the seedling planting section (4) and the fertilizer application device (5);
A planting operation on / off member (25a) for turning on and off the planting operation of the seedling planting section (4) is provided, and a fertilization transmission on / off member (422) for turning on and off the operation of the fertilizer (5) is provided. A rear wheel rotation sensor (205, 205) for detecting a rotation speed of the rear wheel (11, 11);
The rotation interlocking mechanism (T) raises the seedling placement section (4), starts counting the number of rotations of the rear wheel rotation sensors (205, 205), and sets the planting operation on / off member (25a) and fertilizer application. When the transmission receiving member (422) is turned off, the seedling placement part (4) descends, the float (55) comes into contact with the ground, and the detection angle of the angle detecting member (162) falls within a predetermined angle range. A control device (163) is provided for setting the transmission on / off member (422) to the on state, and for setting the planting operation on / off member (25a) to the on state when the rear wheel rotation sensor (205, 205) reaches a predetermined number of revolutions. ,
Left and right rear wheel gear cases (200L, 200R) for respectively supplying driving force to the left and right rear wheels (11, 11) are provided, and one of the left and right rear wheel gear cases (200L, 200R) is provided with a rear wheel gear case (200L, 200R). ) Is provided with a fertilizer application transmission member (401) for supplying a driving force to the fertilizer application device (5) via the fertilizer application device (5) and the fertilizer application transmission on / off member (422) for turning on / off the transmission to the fertilizer application transmission member (401). To configure the fertilizer transmission mechanism (420)
A fertilization transmission actuator (426a) for turning on and off the fertilization transmission on / off member (422);
A turning operation member (34) for steering the traveling vehicle body (2) is provided, and left and right front wheels (10, 10) are provided on the traveling vehicle body (2), and the left and right front wheels (10, 10) are interlocked with the operation of the turning operation member (34). A steering mechanism (S) for changing the directions of the left and right front wheels (10, 10) and disengaging the side clutch (87) of the rear wheel (11) inside the turn at the time of turning is provided, and the turning operation member (34) is provided. ) Is provided with a turning direction detecting member (193) for detecting a turning operation direction.
When the turning direction detected by the turning direction detecting member (193) is in the turning inside of the left and right rear wheel gear case (200R) provided with the fertilization transmission member (401), the control device (163) determines whether the turning direction is right or left. A seedling transplanter characterized in that the timing at which the fertilizer transmission actuator (426a) turns on the fertilizer transmission on / off member (422) is made earlier than when the rear wheel gear case (200L) on the other side is turned inside. . A fertilization transmission switch (428) for operating the fertilization transmission actuator (426a);
The control device (163) operates the turning interlocking mechanism (T) such that the detection angle of the angle detection member (162) falls within a predetermined angle range, or the fertilization transmission switch (428) is turned on. When any one of the conditions is satisfied, the fertilizer application transmission actuator (426a) is operated to set the fertilizer application transmission on / off member (422) to the on state,
One end of the fertilization transmission member (401) is projected outside the rear wheel gear case (200L, 200R), and a portion of the fertilization transmission member (401) protruding from the rear wheel gear case (200L, 200R). 2. The seedling transplanter according to claim 1, further comprising a manual operation member (426) for manually supplying the fertilizer of the fertilizer application device (5) . 3.

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