JP3933285B2 - Steering operation device for paddy field machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a steering operation device for a paddy field work machine provided with a linkage mechanism that switches left and right side brakes for a rear wheel to a braked state by operating left and right artificial operating tools.
[0002]
[Prior art]
  In the turning operation at the end of the turn, from the necessity of making a small turn, the left and right artificial operation tools are operated to apply a brake to the rear wheel inside the turn.
[0003]
[Problems to be solved by the invention]
  In the case of such a structure, at the time of turning, the brake is applied to the traveling device inside the turning, so that the traveling device inside the turning is dragged by being pulled by the traveling device outside the turning. It sometimes roughened the field.
[0004]
  An object of the present invention is to provide a steering operation device for a paddy field work machine that does not roughen a field while performing as small a turn as possible even with a traveling device including a side clutch brake.
[0005]
[Means for Solving the Problems]
    〔Constitution〕
  Claim 1The characteristic configuration according to the invention is such that the left and right rear wheelsEachThe side clutch brake can be switched from the clutch-disengaged state to the brake-engaged state.To the aboveSide clutch brake is an artificial operation toolbyFull stroke operationSlow the clutch by sliding the clutch by half clutch state or by turning the clutch on and offThe mechanism is to provide a semi-transmission state, and its effects are as follows.
[0006]
    [Function and effect]
  In this invention,Half-clutch state in which the clutch is slid by full stroke operation with the left and right artificial operation tools, or decelerated by turning the clutch on and offSince the half-transmission state appears, the corresponding rear wheel inside the turn is in an intermediate state between the state where the clutch is engaged and the state where the clutch is not connectedOr similar stateTherefore, the turning operation of the traveling machine body is not hindered, and the field surface is less likely to appear.
[0007]
    〔Constitution〕
  Claim 2The characteristic configuration according to the invention is directed to the left and right rear wheels.Left and rightEach side clutch brake is configured to be switchable from a clutch disengaged state to a brake applied state, and at the time of work traveling, one of the side clutch brakes corresponding to the rear wheels on the inner side of the turn is turned into a clutch disengaged state orDecelerate by half-clutch state where the clutch is slid or by turning the clutch on and offThe switching mechanism for switching to the semi-transmission state is provided, and the operation and effect thereof are as follows.
[0008]
    [Function and effect]
  In this invention, when there is a turning operation by the switching mechanism, the side clutch brake inside the turning is in the clutch disengaged state orDecelerate by half-clutch state where the clutch is slid or by turning the clutch on and offSince it is in a semi-transmission state, it is possible to obtain a traveling state that does not roughen the field.
[0009]
  Claim 3The purpose of the invention isClaim 2In addition to the object of the present invention, the linkage mechanism that links the side clutch brake and the turning operation mechanism is to maintain the smooth operation while suppressing the influence from the field surface.
[0010]
    〔Constitution〕
  Claim 3The characteristic configuration according to the invention is as follows:Claim 2In the invention according to the present invention, the switching mechanism is such that the steering transmission mechanism provided in the steering gear box and the left and right side clutch brakes for the traveling device are linked, and the operation and effect thereof are as follows. .
[0011]
    [Function and effect]
  Since the operating force to operate the side clutch brake is taken out from the transmission mechanism in the steering case, the linkage part with the transmission mechanism can be protected by the steering case, and the mud soil that is lifted from the field surface is linked to the part. Can be prevented, and the operation of the linkage mechanism can be maintained smoothly.
[0012]
  The characteristic configuration according to the invention of claim 4 is the invention according to claim 2 or 3,The left and right operating arms that operate the left and right side clutch brakes for the left and right rear wheels and the left and right artificial operating tools are linked to each other by operating rods, and the left and right operating rods are swung by a handle operation. A swing arm is attached, and a spring is interposed between the swing arm and the left and right operating rods.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
  As shown in FIG. 1, a riding type rice transplanter as an example of a working machine is configured by connecting a seedling planting device 2 to a rear portion of a traveling machine body 1 through a link mechanism 3 and a hydraulic cylinder 4 so as to be movable up and down. ing.
[0014]
  The traveling body 1 includes an engine 8 and a front portion of a body frame 7 including a pair of left and right steering driving front wheels (an example of a traveling device) 5 and a pair of left and right driving rear wheels (an example of a traveling device). A traveling / planting transmission case 10 to which power is transmitted via a belt-type continuously variable transmission 9 is mounted, and a steering handle 11 for a front driving wheel 5 constituting the riding driving section is mounted on the body frame 7. And the driver's seat 12 are attached.
[0015]
  The driving rear wheel 6 is attached to left and right cylindrical portions 22A and 22B of an axle case 22 supported on the rear portion of the body frame 7 so as to be able to roll around a longitudinal axis P within a certain range. As shown in FIG. 3, a cylindrical transmission case 25 in a left-right orientation provided with an input shaft 24 interlocked with a power take-out shaft for driving rear wheels of the transmission case 10 via a transmission shaft 23, and both ends thereof The left axle case 27L for the left driving rear wheel 6 is provided at the lower end portion of the left gear case 26L, and the right driving rear wheel 6 is provided at the lower end portion of the right gear case 26R. Each of the right axles 27R is supported.
[0016]
  The transmission system from the input shaft 24 to the left axle 27L and the transmission system from the input shaft 24 to the right axle 27R are respectively provided with left and right provided at the foot of the riding operation unit as shown in FIG. There is provided a set of a clutch 29 and a brake 30 which are operated in association with each other by a steering pedal (an example of an artificial operating tool) 28L and 28R. The set of the clutch 29 and the brake 30 is referred to as a side clutch brake that is used during a turning operation.
[0017]
  The clutch 29 is interposed between a lateral transmission shaft 32 interlocked with the input shaft 24 via a bevel gear mechanism 31 and left and right lateral passive shafts 33 interlocked with the left axle 27L and the right axle 27R. This is a multi-plate type that intermittently transmits power from the lateral transmission shaft 32 to the lateral passive shaft 33.
  Specifically, as shown in FIG. 4, the sliding transmission body 34 is moved in the axial direction with respect to the lateral transmission shaft 32 and is rotated integrally with the lateral transmission shaft 32. The clutch housing 35 is splined to the lateral passive shaft 33 in a state where the axial direction is fixed with respect to the lateral passive shaft 33 and is rotated integrally with the lateral passive shaft 33, and alternately in the axial direction. Of the plurality of transmission clutch disks 36 and the passive clutch disks 37 that are in a transmission state by being pressed in the axial direction in a state of being positioned at the position and in a non-transmission state by being released from the pressure contact. The clutch disk 36 is mounted on the sliding transmission body 34 so as to be movable in the axial direction with respect to the sliding transmission body 34 and rotated integrally with the sliding transmission body 34. A passive clutch disk 37 is attached to the clutch housing 35 so as to be movable in the axial direction with respect to the clutch housing 35 and rotated integrally with the clutch housing 35, and the clutch housing of the sliding transmission 34. As the slider 35 slides toward the side of the transmission shaft 32, the pusher 41 that press-acts the clutch clutch 36 and the passive clutch disk 37 together with the receiver 40 attached to the clutch housing 35 is slid and transmitted. The sliding transmission body 34 is attached to the body 34, attached to the shaft end of the lateral transmission shaft 32 via a bolt 38, and supported by the support member 39 that rotatably supports the clutch housing 35. A group of belleville springs 42 to be energized is provided, and as the steering pedals 28L and 28R are depressed, The sliding transmission body 34 is released from pressure contact against the urging force of the disc spring 42 via the release bearing 45a by being moved to the axial direction sliding transmission side with respect to the lateral transmission shaft 32 via the left fork 43. A release member 45 that is pressed and moved in the direction is provided. 43A is an arm that is linked to the corresponding steering pedals 28L, 28R via a rod or the like and operates the shift fork 43 in accordance with the depression operation of the steering pedals 28L, 28R.
[0018]
  As shown in FIG. 4, the brake 30 acts on the clutch housing 35 to apply a braking force to the laterally passive shaft 33 and is movable in the axial direction with respect to the cylindrical transmission case 25. A plurality of fixed brake discs 46 attached to the cylindrical transmission case 25 in a non-rotatable state and a state that is movable in the axial direction relative to the clutch housing 35 and rotates integrally with the clutch housing 35. A plurality of rotating brake discs 47 mounted in a state are arranged so as to overlap with each other in the axial direction while being alternately positioned in the axial direction, and are fitted to the end of the cylindrical transmission case 25 and connected to the gear case 26. A ring-shaped restricting tool 48 that is prevented from coming off by contact and restricts the movement of the fixed brake disc 46 and the rotating brake disc 47 to the gear case 26 side. The fixed brake disc 46 and the rotary brake disc are provided by pressing the fixed brake disc 46 and the rotary brake disc 47 to the release member 45 in accordance with the movement of the release member 45 in the clutch disengagement direction. 47 is formed so as to form a brake operation portion 49 that presses 47 and presses the brake. That is, the brake 30 is disposed and formed concentrically outside the clutch 29.
  The clutch 29 is first disengaged with the movement of the release member 45 toward the sliding transmission body 34, and the brake 30 is set to perform a braking operation with the subsequent movement.
[0019]
  Next, the assembly procedure will be described.
<1> First, the release member 45 is assembled to the lateral transmission shaft 32.
<2> Next, the bolt 38 is assembled with the sliding transmission body 34, the clutch housing 35, the transmission clutch disk 36, the passive clutch disk 37, the support member 39, the receiving tool 40, the pressing tool 41, and the disc spring 42. It is attached to the end of the lateral transmission shaft 33.
<3> Finally, the fixed brake disc 46, the rotary brake disc 47, and the restricting tool 48 are assembled, and the gear cases 26L and 26R are connected to the cylindrical transmission case 25 in a state where the clutch housing 35 is interlocked with the lateral passive shaft 33.
[0020]
  According to the above configuration, when turning to the left, the steering handle 11 is operated to the left, and at the same time, the left steering pedal 28L is operated to cut off the transmission to the left driving rear wheel 6 and to the left The left rear wheel 6 can be turned left with braking stopped. When turning right, the right steering pedal 28R is depressed and the right steering pedal 28R is operated simultaneously. The right drive rear wheel 6 can be braked and the vehicle can turn right, and both the steering pedals 28L and 28R can be depressed together to cut off the transmission to the both drive rear wheels 6. The airframe can be stopped by braking and stopping the both driven rear wheels 6.
[0021]
  Next, a structure for driving the side clutch brake by operating the steering pedals 28L and 28R will be described.
  As shown in FIG. 6, the control hydraulic cylinder 19 is connected to the arm 43A of the shift fork 43 for the side clutch brake to drive the arm 43A to swing. On the other hand, the steering pedals 28 </ b> L and 28 </ b> R are provided with a potentiometer type operation detection sensor 20 that detects the operation amount, and detection information from the operation detection sensor 20 is input to the control device 21, so that the control hydraulic cylinder 19 Control the operation.
  That is, if the operation amount of the arm 43A is suppressed to an operation amount that is less than the total operation amount, the release member 45 can be moved in a range that does not contact the fixed brake disc 46, and the clutch discs 36 and 37 are separated. Thus, the clutch 29 can be disengaged. When the hydraulic cylinder 19 is extended from this state, the brake operating tool 49 can be brought into contact with the brake discs 46 and 47 to operate the brake. When the hydraulic pressure is increased so as to increase the pressure contact force of the brake disks 46 and 47 in a state where the brake operation tool 49 is brought into contact with the brake disks 46 and 47, the brake force can be increased.
  Here, the control device 21, the hydraulic cylinder 19, and the operation detection sensor 20 are referred to as a linkage mechanism A that relates the side clutch brake and the steering pedals 28L and 28R.
[0022]
  A structure in which the side clutch brake can be switched to the following three states when the steering pedals 28L and 28R are depressed all the way will be described. As shown in FIG. 6, a control valve 44 for controlling the pressure oil to the hydraulic cylinder 19 is provided, and the three-state switching type artificial selection so that the extension state of the hydraulic cylinder 19 can be switched with respect to the control valve 44. A switch 74 is provided. Based on the switching operation result to the selection switch 74, the first state in which the extension state of the hydraulic cylinder 19 is switched and the clutch 29 is disengaged, the second state in which the brake 30 exerts a weak braking force, and the strong braking force Can be switched to the third state to exhibit
  By setting to the first state, the drag phenomenon caused by the driving rear wheel 6 on the inside of the turn can be avoided during turning, and the orientation of the traveling machine body 1 can be easily corrected when performing alignment or the like during planting work. .
  Since the traveling pedals 28L and 28R are juxtaposed at the right foot of the driver, the third state may be set only when the traveling pedals 28L and 28R are depressed simultaneously. Although there is a method of using the selection switch 74 as a method of setting to the third state, a method of switching based on information from the operation detection sensor 20 that detects the operation state of the travel pedals 28L and 28R may be adopted.
[0023]
(Second Embodiment)
  In the first embodiment, the configuration in which the clutch 29 is set to the disengaged state by depressing the steering pedals 28L and 28R has been described, but the steering pedals 28L and 28R are maintained while maintaining the configuration of the first embodiment. A configuration capable of producing a half transmission state by full stroke operation will be described.
  As shown in FIG. 8, a spline portion is formed on the inner surface of the axle case 22 in order to prevent the outer peripheral edge of the fixed brake disk 46 from rotating, but a brake operation portion 49 formed at the tip of the release member 45 is provided. The release member 45 is not rotated with respect to the axle case 22 by being fitted and held in the spline portion.
[0024]
  On the other hand, a cam structure in which the release member 45 set so as not to rotate with respect to the lateral transmission shaft 32 is driven and moved in the axial direction of the lateral transmission shaft 32 will be described. As shown in FIG. 8, the diameter of the boss part loosely fitted to the lateral transmission shaft 32 of the release member 45 is increased to form a large-diameter boss part 50, and a receiving cam surface 50 </ b> A is formed on the outer surface of the large-diameter boss part 50. To do. The clutch member 51 is fitted to the lateral transmission shaft 32 by a spline so as to face the large-diameter boss portion 50, and the shift fork 43 is engaged with the clutch member 51. Configure to be movable.
  A driving cam surface 51A that acts on the receiving cam surface 50A is formed on the side surface of the clutch member 51 that faces the large-diameter boss portion 50. The receiving cam surface 50A and the driving cam surface 51A are formed as shown in FIG. 8, and the driving cam surface 51A rotates integrally with the laterally rotating shaft 32 and rotates relative to the receiving cam surface 50A. The release member 45 is configured to be able to move forward and backward by alternately switching the projections and depressions of each other and interacting with each other.
[0025]
  With the above configuration, when the clutch member 51 is brought close to the release member 45 by the arm 43A in response to the operation of the steering pedals 28L and 28R, the receiving cam surface 50A and the drive cam surface 51A are brought into an engaged state. Become. Then, since the drive cam surface 51A rotates integrally with the lateral transmission shaft 32, the release member 45 receives the reaction force from the clutch member 51 that is prevented from moving in the axial direction by the engagement of the arm 43A. A semi-transmission state in which the clutch 29 is turned on and off by moving forward and backward in the axial direction can appear.
  The timing at which the clutch 29 is turned on and off is determined by the number of installed drive cam surfaces 51A in the circumferential direction. The timing is determined by turning on and off during one period T as shown in FIG.
  The semi-transmission state can appear when the steering bead 28L, 28R is fully stroked with the first state selected by the selection switch 74 described above. Here, the receiving cam surface 50A and the driving cam surface 51A are referred to as a mechanism that reveals a semi-transmission state. In addition, here, the state where the clutch is engaged or disengaged is referred to as a half-transmission state, but a generally used half-clutch state is included.
[0026]
(Third embodiment)
  Here, there are two types, a second linkage system that performs a clutch operation based on a steering operation on the steering handle 11, and a first linkage system that can perform a brake operation based on an operation on the steering pedals 28L and 28R. What has a structure is demonstrated.
  As shown in FIG. 9, a second linkage mechanism 52 that links the shift fork 43 to the pitman arm 13 that is swung in response to an operation on the steering handle 11 is configured.
  The second linkage mechanism 52 is configured as follows. That is, the balance-type swing arm 53 is provided at the intermediate position of the machine body, and the balance-type swing arm 53 and the pitman arm 13 are connected by the first connecting rod 15. The connecting rods 54 and 54 are extended from both ends of the balance-type swing arm 53 and connected to arms 55A and 55A of a second shift fork 55 described later with respect to the left and right side clutch brakes. The connecting portion between the balance-type swing arm 53 and each connecting rod 54 is provided with shock-absorbing springs 58, 58, and the side clutch brake does not operate when the steering handle 11 is played or slightly turned back. It is like that.
[0027]
  Here, the shift fork 43 described in the first embodiment is referred to as a first shift fork 43. As shown in FIG. 10, the boss portion 50 with which the shift fork 43 of the release member 45 is engaged is further extended. The receiving cam member 57 is attached and fixed to the boss portion 50 so as to be integrally rotatable. On the outwardly facing surface of the receiving cam member 57, a cam surface 57A similar to the receiving cam surface 50A as described above is formed. On the opposite side of the receiving cam member 57, the clutch member 51 having the driving cam surface 51A shown in the second embodiment is externally fitted to the lateral drive shaft 32 so as to be integrally rotatable. The second shift fork 55 is linked to the clutch member 51.
  With the configuration as described above, the semi-transmission operation in which the side clutch brake is described as the second state can be performed by the steering operation to the steering handle 11.
  Here, as a state in which the clutch 29 is operated, a configuration has been described in which a semi-transmission state is obtained by a steering operation of the control handle 11, but only the clutch 29 is disconnected as shown in the first embodiment. Also good. In this case, it is not necessary to fit the release member 45 to the spline portion of the axle case 22, and it is not necessary to rotate the clutch member 51 integrally with the transmission shaft 23.
[0028]
  On the other hand, as shown in FIGS. 9 and 10, the first shift fork 43 is engaged with the base end portion of the boss portion 50 of the release member 45, and the arm 43A of the left and right first shift forks 43 and the left and right steering pedals 28L. , 28R. A linkage rod 59 and a spring 60 are interposed between the arm 43A and the steering pedals 28L and 28R, and the arm 43A and the steering pedal 28L are linked. The linkage rod 59 and the spring 60 are referred to as a first linkage mechanism 75.
  With such a configuration, the side clutch brake can be operated from a state in which only the clutch 29 is operated to a state in which the brake 30 is operated by depressing the steering pedals 28L and 28R.
  With the configuration as described above, when it is desired to turn the vehicle in a semi-transmission state during turning, the steering pedals 28L and 28R may not be operated.
[0029]
[Fourth Embodiment]
  In the first and second embodiments, by adjusting the stroke of the hydraulic cylinder 19, even when the steering pedals 28L and 28R are operated for the full stroke, the side clutch brake can be operated only in the clutch disengaged state. In the linkage mechanism between the steering pedals 28L and 28R and the shift fork 43, a member that exhibits the same function is formed.
  As shown in FIGS. 11 and 12, a long hole 43a is provided in the arm 43A for turning on and off the side clutch brake along the longitudinal direction, and the steering pedals 28L and 28R and the arm 43A are connected at both ends of the long hole 43a. A mooring point for fixing the connecting position of the rod 62 is provided.
  A solenoid 63 for moving the connecting pin along the elongated hole is provided at the position of the connecting pin 62 of the connecting rod 62 with respect to the arm 43A. The solenoid 63 is biased by a biasing spring 64 to a position far from the rotational axis of the arm 43A. The connecting pin position can be forcibly moved by the solenoid 63 to a position close to the rotation axis.
  The solenoid 63 is driven by moving the operation detection sensor 20 that detects the operation state of the steering pedals 28L and 28R, the handle detection sensor 16 that detects the operation of the steering handle 11, or the seedling planting device 2 up and down. Control is performed by the control device 21 on the basis of a signal from an operation position detection sensor 18 or the like that detects an operation position of the lift operation lever 17 to be operated.
  If it becomes clear from the above sensors that the vehicle is in a working state, the solenoid 63 can be operated to obtain a clutch disengaged state or a semi-transmission state. Here, the solenoid 63 is referred to as a restriction mechanism provided in the linkage mechanism A.
  If a cylinder is used instead of the solenoid 63, the biasing spring 64 is not necessary.
[0030]
[Another embodiment]
(1) Next, a description has been given of a mode in which a cam is used to obtain a semi-transmission state. Here, a mode in which the arm 43A is swung forward and backward using the rotation of the transmission shaft 23 will be described. To do.
  As shown in FIGS. 13 and 14, the intermediate shaft 66 and the output shaft 67 are installed on the left and right via an output gear 65 mounted on the transmission shaft 23, a dog clutch 66 </ b> A is provided on the intermediate shaft 66, and a drive cam is provided on the output shaft 67. A plate 68 is attached. As shown in FIG. 14, the drive cam plate 68 has two cam portions in the circumferential direction.
  Regarding the dog clutch 66A, the pitman arm 13 and the dog clutch 66A are mechanically linked so that the dog clutch 66A is turned on and off based on the steering operation to the steering handle 11, and the clutch is engaged based on the steering operation. To do. The spring 69 is biased to the cut state.
  With the above-described configuration, when a steering operation is performed, the clutch 66A is actuated and the drive cam plate 68 starts to rotate, abuts against the arm 43A, and presses and drives the arm 43A. The arm 43A is biased back by a spring 69. As a result, the clutch 29 enters a half-clutch state.
  On the other hand, the arm 43A is linked to the steering pedals 28L and 28R with a wire or the like, and the brake 30 can be operated when fully depressed.
[0031]
(2) In (1) of the other embodiment, the cam 43 is used to swing the arm 43A to obtain the half-clutch state, but the arm 43A is driven and swung in the first embodiment. A half-clutch state may be obtained using the control hydraulic cylinder 19 that moves. That is, a semi-transmission state may appear by giving a pulse as shown in FIG. 7 to the control valve 44 that controls the hydraulic cylinder 19.
[0032]
(3) In the third embodiment, the mechanism that links the pitman arm 13 and the arm 55A to operate the side clutch brake by turning on the steering handle 11 has been described. However, here, the steering gear box 70 is described. The output is taken out from the fan-shaped gear 71 provided in the above. As shown in FIG. 15, a pin 72A is erected on an output rod 72 installed on the steering gear box 70, and this pin 72A is engaged with a fan-shaped gear 71 as a steering transmission mechanism. It is configured to be able to move forward and backward in the axial direction. One end of the output rod 72 protruding from the steering gear box 70 is engaged with a drive arm 73 that swings the balance, and the arm 43A and the like are linked to the drive arm 73 with a wire so that a side clutch operation can be performed by a steering operation. To do.
  Here, the clutch is operated by the sliding movement of the output rod 72, but as shown in FIG. 16, the output rod 72 in which the output arm 72A is integrally formed from the shaft for driving the sector gear 71 via the worm gear mechanism. It is also possible to adopt a configuration in which the rotation is rotated around the axis and the movement of the rotation is transmitted to the drive arm 73.
[0033]
  In the said embodiment, although the example of application to a rice transplanter was shown, you may apply this invention to a direct seeding machine etc.
[Brief description of the drawings]
[Fig. 1] Side view of riding rice transplanter
FIG. 2 is a plan view showing an arrangement state of a side clutch operation tool.
FIG. 3 is a developed sectional view of an axle case.
[Fig. 4] Longitudinal sectional view of clutch and brake
FIG. 5 is a cross-sectional view of a shift fork
FIG. 6 is a control block diagram.
FIG. 7 is a time chart showing a half transmission state.
FIG. 8 is a longitudinal sectional view of a clutch brake that shows a half transmission state
FIG. 9 is a plan view showing a linkage mechanism capable of operating a side clutch brake with a steering handle and a steering pedal.
FIG. 10 is a vertical side view of a side clutch brake corresponding to FIG.
FIG. 11 is a plan view showing a state in which a restricting mechanism capable of only disengaging the clutch is provided in the linkage mechanism of the side clutch brake and the steering pedal.
12 is an enlarged plan view of the regulating mechanism shown in FIG.
FIG. 13 is a schematic configuration diagram showing a mechanism for swinging forward and reverse an arm that reveals a semi-transmission state;
14 is a front view of the cam in FIG.
FIG. 15 is a configuration diagram showing a state where power for driving the side clutch brake is taken out from a fan-shaped gear in the handle case.
16 is another configuration diagram for extracting power by rotating the output rod of FIG.
[Explanation of symbols]
  6 Rear wheels
  28L, 28R Artificial operation tool
  63 Regulatory mechanism
  50A, 51A Half clutch state mechanism
  A linkage mechanism

Claims (4)

With a configuration capable of switching to a state containing brake each side clutch brakes of the left and right relative to the rear wheels via a clutch disengaging condition,
Misao paddy working machine is provided with a mechanism for revealing the semi transmission state to decelerate by switching on and off the half clutch state or the clutch slid the clutch by full stroke operation by the manual operation member to said side clutch brake when working travel Directional operation device. The left and right side clutch brakes for the left and right rear wheels can be switched from the clutch disengaged state to the braked state,
A switching mechanism that switches one side clutch brake corresponding to the rear wheel inside the turning to a half-transmission state in which the clutch is disengaged, a half-clutch state that slides the clutch, or a half-transmission state that is decelerated by turning the clutch on and off during a work run Steering operation device for paddy field work machine. The steering operation device for a paddy field work machine according to claim 2 , wherein the switching mechanism links a steering transmission mechanism provided in a steering gear box and left and right side clutch brakes for the traveling device. The left and right operation arms for operating the left and right side clutch brakes for the left and right rear wheels and the left and right human operation tools are linked to each other by operating rods, and the left and right operating rods are swung by a handle operation. 4. A steering operation device for a paddy field work machine according to claim 2, wherein a swing arm is attached and a spring is interposed between the swing arm and the left and right operating rods.

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