JPH0587204B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a power transmission device for an agricultural machine. Specifically, a hydraulic pump is driven from a prime mover, and a traveling transmission case is connected from the driven hydraulic pump side. This invention relates to a power transmission device for agricultural working machines such as rice transplanters and seeding machines, which is configured to drive a transmission mechanism within the machine and move the running wheels up and down using a hydraulic pump.

PRIOR ART Conventionally, power transmission devices for agricultural machines that drive a hydraulic pump from the prime mover side and further drive a transmission mechanism in a hydraulic pump travel transmission case have been known. Some were equipped with a clutch device that allowed the power to be turned on and off using a control lever.

Problems to be Solved by the Invention In the prior art, the drive of the hydraulic pump or the drive of the transmission mechanism in the traveling transmission case can be turned on and off using separate operating levers. When the drive on the hydraulic pump side is turned off, the drive on the traveling transmission case side is also automatically turned off, so it is difficult to determine which control lever was used to stop the drive on the traveling side. Incorrect clutch operation was performed, and in order to operate the clutch correctly, it was necessary to operate both clutch levers in sequence, making the operation extremely cumbersome.

Means for Solving the Problems The present invention has taken the following technical means to solve the problems of the above-mentioned prior art. That is,
In this invention, the hydraulic pumps 19, 20 are driven from the prime mover 4 via the first clutch device A, and the input shafts of the traveling transmission case 2 are connected to the second clutch device B from the input shafts 27 of the hydraulic pumps 19, 20. In the traveling vehicle body of an agricultural machine, which is provided with a transmission mechanism driven through the hydraulic cylinder device 13, 14 operated by the hydraulic pumps 19, 20, the traveling wheels 7, 8 are moved up and down. The first clutch device A and the second clutch device B can be operated using a single operating lever to control whether both clutch devices A and B are in the “on” state or only the first clutch device A is in the “on” state.
A power transmission device for an agricultural working machine is configured such that it can be switched between the state of 1 and the state of at least the first clutch device A being ``disengaged'' in a single operation step.

Embodiment A power transmission device for a traveling rice transplanter which is an embodiment of the present invention will be described in detail. Reference numeral 1 denotes a frame of a rice transplanter, which is fixed to the rear of a traveling transmission case 2. 3 is an engine stand fixed to the front part of the traveling transmission case 2. The frame 1 is formed into a cylindrical body, and the engine stand 3 is provided in a cross-sectional shape.

4 is a prime mover, which is mounted on the engine stand 3. Reference numeral 5 denotes a planting transmission case, which is attached to the rear end of the frame 1 and drives the transmission part inside the transmission case from the traveling transmission case 2 side via a transmission shaft 8 (not shown) inside the frame 1. It is provided.

Reference numeral 6 denotes a control handle, the base side of which is fixed to the rear of the planting transmission case 5, and is a bar handle divided into two parts facing diagonally backward and upward.

Reference numerals 7 and 8 denote running wheels, which are located on both the left and right sides of the frame 1, and whose base sides are pivoted to the left and right sides of the running transmission case 2 and are supported by chain cases 9 and 10, respectively, which are provided for free vertical movement. It is configured to be rotated by transmission while swinging up and down.

Reference numerals 11 and 12 denote arms, which are members whose bases are fixed to the chain cases 9 and 10 and project upward.

Reference numerals 13 and 14 denote hydraulic cylinder devices, which are composed of cylinders 13a and 14a and pistons 13b and 14b, and a bracket 1 in plan view whose base end on the cylinder side is fixed to the front end of the engine stand 3.
5. A spring plate 16, which is longer than the bracket 15 in the left and right direction, is fixed and connected to the left and right ends of the spring plate 16. Moreover, the pistons 13b, 14b
When the pistons 13b, 14b protrude, the running wheels 7,
8 is provided to be moved downward.

Reference numeral 17 denotes a bumper mounting metal fitting, and the spring plate 16 is held down by this metal fitting 17 and fastened together.

Reference numeral 18 denotes a hydraulic case, which is attached to the upper part of the traveling transmission case 2. The hydraulic case 18 consists of left and right hydraulic pumps 19, 20 (gear pumps), hydraulic switching valves 21, 22, and a hydraulic tank 23.The hydraulic case 18 is composed of left and right hydraulic pumps 19, 20 (gear pumps), hydraulic switching valves 21, 22, and a hydraulic tank 23. A left case 24 having a hydraulic pump 20 and a hydraulic switching valve 21 is installed on the right side, and a right case 25 having a hydraulic pump 20 and a hydraulic switching valve 22 is installed on the right side. A tank 23 is configured. 24a and 25a are pump covers. 26 is a strainer, and the pump cover 24a protrudes into the hydraulic tank 23 from the left and right sides.
It consists of a mesh tube 26a installed between oil suction bosses a and b provided on 25a. An input shaft 27 serves as a drive shaft for the left hydraulic pump 19, and is connected to a drive shaft 28 of the right hydraulic pump 20 through a rectangular transmission pipe 29.

Reference numerals 30 and 31 indicate switching levers of the hydraulic switching valves 21 and 22.

The hydraulic cylinder devices 13 and 14 are operated by the hydraulic circuit shown in FIG. 12 by this hydraulic mechanism.

Reference numerals 32 and 33 denote sensing ground floats, which are provided at a predetermined distance from side to side at the front side between the running wheels 7 and 8, and whose rear portions are pivotally connected to the frame 1 by pins, and whose front portions are connected vertically to the frame 1. It is attached to the engine stand 3 by a freely movable link. The left and right sensing ground floats 32, 33 and the switching levers 30, 31 of the hydraulic system are linked by the interlocking mechanism shown in FIG. 9, and when the floats 32 or 33 move upward above a certain level, the hydraulic pressure is switched. The valve 21 or 22 is switched to move the traveling wheels 7 or 8 downward.

To explain this interlocking mechanism, reference numeral 34 is a shaft rotatably attached to brackets 35 and 36 fixed to the engine stand 3. 37, 38 and an operating arm are pivotally connected to the shaft 34 at their base side and extend rearward. 39 and 40 are rods,
This is a rod that interlocks the operating arm 37 and the switching lever 30 and the operating arm 38 and the switching lever 31. 4
1 and 42 are rods, and the sensing ground float 32,
33 and actuating arms 37, 38, springs 43, 44 are interposed to provide upward relief, and the connection height is the same as that of double nuts 45, 4.
It is configured so that it can be adjusted by 5. 4
6 and 47 are interlocking metal fittings that are integrally attached to the left and right ends of the shaft 34, and are screwed into nuts to which adjustment bolts 48 and 49, which can adjust the height of the vertical protrusion, are fixed. , 49 are configured so that they can come into contact with receiving pieces 50, 51 provided on the operating arms 37, 38. 52 is an operating wire.

53 is a bracket 5 attached to the frame 1.
4 and 55, to which plate-shaped metal fittings 56 and 57 are fixed, and these plate-shaped metal fittings 56 and 5
Long holes 58, 59 are bored in 7, and these long holes 58, 5
The coil springs 60, 61, one end of which is engaged with the switch lever 9, are engaged with the switching levers 30, 31, and the plate-like metal fitting 56 is rotated by the wire 62, so that the coil springs 60, 6
It is provided so that the tension of 1 can be changed and adjusted. still,
These elongated holes 58 and 59 are provided so that the switching levers 30 and 31 can freely rotate when the tension of the springs 60 and 61 becomes zero.
Of course, it may be worn on the first side.

63 is an output pulley of the prime mover 4; 64 is a hydraulic pulley with double belt winding portions; a small-diameter pulley 64a and a large-diameter pulley 64b are formed; and 64 is fixed to the input shaft 27.

65 is an input pulley attached to the input shaft of the traveling transmission case. 66 and 67 are V belts, the former between the pulley 63 and the large diameter pulley 64b, and the latter between the small diameter pulley 64a and the input pulley 65.
each V-belt 6
6 and 67 are constituted so that their power can be turned on and off by a first clutch device A and a second clutch device B, which are composed of tension clutches 68 and 69 that can be tightened and loosened. 68a and 69a are tension pulleys, and 68b and 69b are tension arms.
The tension arm 68b is pulled by a spring 70, and the tension pulley 68a is always at V.
Tighten the belt 66 and the first clutch device A is turned on.
It is designed to maintain the state.

Reference numeral 71 denotes an operating panel, which is attached to a connecting pipe 100 that connects the left and right operating handles 6, 6. Reference numeral 72 indicates a main clutch lever, and 73 indicates a planting clutch lever which also serves as a hydraulic lever. Both cylinders 75 and 76 are inserted through a pin 74 supported on the panel 71 and fixed thereto.

7. The planting clutch lever 73 is provided so as to be rotatable to the left and right by a pin 77.

Arms 78 and 79 are fixed to the cylindrical bodies 75 and 76. Reference numerals 80 and 81 denote wire connecting fittings, whose base sides are connected to the arms 78 and 79 with pins, and a wire 82 passing through the outer wire is connected to the distal end side of the fitting 80.
2 is connected to the tension arm 69b of the second clutch device B via a spring 83. Also,
A wire 84 connected to a planting clutch (not shown) is connected to the tip of one of the metal fittings 81.

85 and 86 are cam bodies, respectively, the cylinder bodies 75 and 86;
The base is fixed to 76. Reference numerals 87 and 88 indicate interlocking cams, which are formed in a dogleg shape when viewed from the side.
1 and 92, and cam rollers 93 and 94 are pivotally supported on the upper side thereof, and are provided so as to come into contact with the cam bodies 85 and 86. Then, the interlocking cam 87 and the tension arm 68b of the first clutch device A are connected by a wire 95.
Further, the hydraulic operation wire 52 is connected to the interlocking cam 88. 96 is a main clutch lever guide hole drilled in the operation panel 71; 97
Similarly, a planting clutch lever guide hole is used to restrict and guide the planting clutch lever 73.

In this configuration, the main clutch lever 7
3 is swung upward to point A, the state shown in FIG. 6 is reached, where the wire 82 is pulled, the wire 95 is loosened, the V-belts 66 and 67 are tightened, and the tension pulleys 68a and 69a are tightened. Ru. Therefore, both the first clutch device A and the second clutch device B are turned on.

Next, when the main clutch lever 73 is operated downward to the intermediate position, the wire 82 and the wire 95 are both loosened, as shown in FIG. However, the second clutch device B becomes "disconnected".

Next, when the main clutch lever 73 is pulled down to point C, the wire 82 is pulled and the wire 95 is loosened, as shown in FIG. For this reason, the first clutch device A and the second clutch device
Both clutch devices B become "disconnected".

Further, when the planting clutch lever 73 is operated, substantially the same operation as the above-mentioned main clutch lever 72 is performed, and the wires 84 and 52 are tightened and loosened. That is, when the lever 73 is at the two points, the planting clutch (not shown) is in the "on" position and the wire 52 is loosened, so that the adjustment bolt 48 and the receiving piece 5 are
0 do not come into contact with each other, and the operating arms 37 and 38 are moved by the sensing ground floats 32 and 33, thereby maintaining an automatic control state. Next, when the lever 73 is operated to the desired position, the planting clutch is "disengaged", and at this time, the wire 52 is also maintained in a relaxed state, and the same automatic control state is maintained. Next, when operating up to point F, the planting clutch remains in the "off" position and the wire 52 is pulled, so the left and right adjustment bolts 48,
49 pushes up the receiving pieces 50, 51, and the state is the same as when the sensing ground floats 32, 33 have moved up significantly, and the left and right hydraulic switching valves 21,
22 is switched at once to project the pistons 13b, 14b of the hydraulic cylinder devices 13, 14,
Both the left and right running wheels 7 and 8 move downward. Further, when the planting clutch lever 73 is operated to the T position, both the hydraulic pressure switching valves 21 and 22 are set to the neutral position.

Reference numeral 98 denotes a sensitivity tensioning lever, which is rotatably attached to a pin 74 provided on the operation panel 71 and inserted into a regulating hole 99 bored in the panel 71 so as to have engaging teeth on the side surface. 6
2 are connected and the wire 62 is loosened (spring 6
It is configured so that it can be adjusted to a position where it is not pulled at all (0 and 61), a position where it is pulled weakly, and a position where it is pulled strongly.

Reference numeral 101 denotes a seedling planting tool, which is attached to both the left and right sides of the planting transmission case 5 by means of a crank and a swing arm, and is provided so as to be able to swing up and down. 10
Reference numeral 2 denotes a seedling tank, which is supported on a control handle 6 so as to be movable left and right, and is moved by a left and right reciprocating mechanism in a planting transmission case 5. 103
is a rear center float, which is attached to the control handle 6 side and the frame 1 so that the front part can move up and down with the rear as a fulcrum.

104 is the bonnet, and the rear part is the lower part X and the upper part Y.
It is configured in a side-shaped configuration so that spare seedlings are mounted in two tiers, upper and lower. 105 indicates a change lever.

To explain the operation of the above example, seedling tank 10
After the seedlings are placed and housed in 2, each part is driven by a prime mover 4. Then, the traveling wheels 7 and 8 come into contact with the tiller surface, and the respective floats 32, 33 and 103 float on the topsoil surface and are propelled by the rotation of the wheel seedling planting tool 8. Further, the seedling planting tools 101, 101 move up and down, and the seedlings are divided one by one from the seedling tank 102, which reciprocates left and right, and are successively planted on the topsoil surface.

The seedling planting work is carried out in this manner, but when the surface of the topsoil is hard, the opening adjustment lever 98 is set by strongly pulling the left and right 60 and 61 at once via the wire 62. On the other hand, when it is soft, springs 60 and 61
It is best to loosen the tension.

During the work, the main clutch lever 72
The position of the planting clutch lever 73 is set to the position A and the position of the planting clutch lever 73 is set to the position D. In this case, when the main clutch lever 72 is at point A, it is in the state shown in FIG.
As described above, both the first clutch device A and the second clutch device B are in the "on" state.

Next, when only the second clutch device B is to be "disengaged", it is only necessary to operate it to the "R" position as shown in FIG. Furthermore, when loading seedlings into the seedling tank 102,
That is, when it is a problem if the running wheels 7 and 8 move unexpectedly due to the sensing ground floats 32 and 33,
The main clutch lever 72 may be operated to point C as shown in FIG. At this time, the first clutch device A
and the second clutch device B are both "disconnected",
The hydraulic pumps 19 and 20 do not rotate and are maintained in a stable state.

In particular, as in the embodiment, the left and right running wheels 7, 8 are automatically controlled up and down by separate sensing ground floats 32, 33 in order to prevent the aircraft from tilting to the left or right. extremely effective;
Further, by simply reciprocating the main clutch lever 72, the clutch devices A and B can be selectively turned on and off as described above, resulting in extremely high operability.

Effects of the Invention The present invention uses the above-mentioned technical means to accurately turn on and off the transmission of the running part and the transmission of the hydraulic pump without making any operational mistakes, and especially when the hydraulic pump is turned off. This provides the effect of preventing erroneous operations such as the traveling wheels being driven and the aircraft body being strongly pressed against the ground and being dragged and damaged.

[Brief explanation of the drawing]

The figures show a walking-type rice transplanter which is an embodiment of the present invention, in which Fig. 1 is a back sectional view of the main parts, Fig. 2 is a side sectional view thereof, and Fig. 3 is a side view of the entire rice transplanter. Fourth
The figure is a front view, Figure 5 is a rear view, Figures 6 to 8 are simplified side views of the main parts to explain the action, Figure 9 is a diagram of the interlocking mechanism of the main parts, and Figure 10 is a plan view of the hydraulic case. figure,
FIG. 11 is a sectional view thereof, and FIG. 12 is a hydraulic circuit diagram. Symbols in the figure: A is the first clutch device, B is the second clutch device, 2 is the traveling transmission case, 4 is the prime mover, 7 and 8 are the traveling wheels, 13 and 14 are the hydraulic cylinder devices, and 19 and 20 are the hydraulic pumps. shows.

Claims (1)

[Claims] 1 The hydraulic pumps 19 and 20 are driven from the prime mover 4 via the first clutch device A, and the hydraulic pump 1
A traveling vehicle body of an agricultural working machine is provided with a transmission mechanism for driving an input shaft of a traveling mission case 2 from input shafts 27 of 9 and 20 via a second clutch device B, and is operated by the hydraulic pumps 19 and 20. In a system in which the running wheels 7, 8 are moved up and down by hydraulic cylinder devices 13, 14, both the first clutch device A and the second clutch device B are operated by a single operating lever. Power in an agricultural machine configured to be switchable in a single operation process between a state where only the first clutch device A is "on", a state where only the first clutch device A is "on", and a state where at least the first clutch device A is "off". transmission device.