JP4107536B2 - Paddy field machine operation device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to the left and right steering clutches that are on the inside of the turn, each of which shifts the transmission to the left and right driving rear wheels separately in accordance with the steering operation beyond the set angle from the straight drive state of the steering front wheels. The present invention relates to an operation device for a paddy field work machine such as a rice transplanter provided with a steering clutch operating mechanism that reversibly cuts and operates.
[0002]
[Prior art]
  With this type of paddy field machine, just by steering the front wheels, the steering clutch inside the turn is disengaged and the driven rear wheels inside the turn follow and rotate. You can turn with good operability.
[0003]
  As an operation device for such a paddy field work machine, what is found in Japanese Utility Model Publication No. 1-193030 is conventionally known.
  That is, as the steering clutch operating mechanism, there is provided a mechanism that always operates to disengage the steering clutch inside the turning when the driving front wheel is steered beyond the set angle.
[0004]
[Problems to be solved by the invention]
[0005]
[0006]
[Means for Solving the Problems]
  The features and actions of the present invention according to claim 1 are as follows.
[0007]
[Characteristic]
  A travel brake that can brake the front drive wheels for steering and the left and right drive rear wheels, and a single brake pedal. To do.
  It has a right steering clutch that turns on and off the transmission to the right driving rear wheel, and transmits to the left driving rear wheel. It has a left steering clutch that moves in and out. A right brake that can brake the right driving rear wheel is not provided between the right steering clutch and the right driving rear wheel, and a left brake that can brake the left driving rear wheel is a left steering clutch. Do not prepare between the left driving rear wheel.
  The steering clutch that reversibly turns the left and right steering clutches so that the steering clutch inside the turn is reversibly turned off only when the steering wheel is driven straight from the straight drive state. An operation mechanism is provided. The steering clutch operating mechanism and the brake pedal are configured to operate independently of each other, and the steering clutch operating mechanism is configured to be switchable between an operating state in which the steering clutch is operated and a non-operating state in which the steering clutch is not operated. .
  A pedal that reversibly switches the steering clutch operating mechanism to a non-actuated state by a depressing operation is disposed on the side opposite to the brake pedal in the left-right direction of the body.
[0008]
[Action]
  By switching the steering clutch operating mechanism to the non-actuated state, the driving force is transmitted to the left and right driving rear wheels without disengaging the steering clutch inside the turn even if the front wheels are steered beyond the set angle. If there is a shortage of thrust during a small turn with the front wheel steered beyond the set angle due to the depth of the tiller, etc., the steering clutch operating mechanism is switched to the non-actuated state. Then, the driving mode with the driving front wheel and the driving rear wheel on the outside of the turn can be shifted to the driving mode with the driving front wheel and the left and right driving rear wheels, and the thrust can be increased.
  Even when turning the front wheels for driving beyond the set angle when traveling or entering or leaving the field, the front steering wheel and the left and right rear wheels are switched by switching the steering clutch operating mechanism to the inactive state. By adopting the driving form according to the above, the thrust can be increased.
  Since the steering clutch operating mechanism is reversibly switched to the non-operating state by depressing the pedal, and the steering clutch operating mechanism is returned to the operating state by releasing the stepping operation on the pedal. As long as the pedal is not depressed, the steering clutch operating mechanism can be maintained in the operating state. That is, there is no forgetting to return to the operating state of the steering clutch operating mechanism.
[0009]
[effect]
  Therefore, the steering clutch operating mechanism can be switched between the operating state and the non-operating state while being able to perform good small turning by operating the steering clutch inside the turning with good operability. Even when the front wheels are steered at a set angle or more with inexpensive means, it is possible to drive all the wheels for powerful propulsion.
  Set the driving front wheels when traveling and braking when driving and turning with the left and right driving rear wheels when turning by driving the front driving wheels beyond the set angle when entering and leaving the field. The steering clutch operating mechanism can be switched to the non-operating state by simply depressing the pedal when necessary, such as when driving the left and right driving rear wheels in a turn with a steering operation beyond the corner. In spite of this, it is now possible to guarantee a small turn with little damage to the field without forgetting the operation.
[0010]
[0011]
[0012]
[0013]
[0014]
[0015]
[0016]
[0017]
[0018]
[0019]
[0020]
[0021]
[0022]
  Claim 2The features of the present invention are as follows.
[0023]
[Characteristic]
  the aboveClaim 1In the present invention according to the present invention, the pedal is disposed in the driving step portion in the vicinity of the front side of the seat of the boarding driving section.
[0024]
[0025]
[0026]
[0027]
[0028]
[0029]
[0030]
[0031]
[0032]
[0033]
[0034]
[0035]
[0036]
[0037]
[0038]
[0039]
[0040]
[0041]
[0042]
[0043]
[0044]
[0045]
[0046]
[0047]
[0048]
[0049]
[0050]
DETAILED DESCRIPTION OF THE INVENTION
[First Embodiment]
  As shown in FIGS. 1 and 2, a rice transplanter, which is an example of a paddy field work machine, is a riding type self-propelled vehicle 3 having a pair of left and right steering front wheels 1 and a pair of left and right driving rear wheels 2. The rear part is connected to a multi-row planting seedling planting device 4 which is an example of a paddy field working device via a four-link mechanism 5 so as to be movable up and down. An elevating cylinder 6 is provided, and a fertilizer application device 7 is provided.
[0051]
  As shown in FIGS. 3 and 4, the self-propelled aircraft 3 includes a transmission case 9 that pivotally supports the driving front wheel 1 via a front axle case 8 and a rear axle case 10 that pivotally supports the driving rear wheel 2. The engine 11 is mounted at a position near the front of the transmission case 9 in the body frame provided with a vibration isolating rubber 12 (an example of a vibration isolating material) in a state where the output shaft 11a is positioned sideways, The boarding operation unit 13 is mounted in a state of being located behind the engine 11.
[0052]
  The boarding operation unit 13 includes a steering handle 14 for steering the front drive wheel 1, a seat 15 located behind the steering handle 14, and a driving step S. The operation step S is arranged above the mission case 9.
[0053]
  The seedling planting device 4 is provided with a seedling setting table 16 that is driven to reciprocate with a set stroke in the left-right direction, and is circulated up and down between the seedling outlet and the field in conjunction with the movement of the seedling setting table 16. A plurality of planting mechanisms 17 for planting seedlings on the seedling platform 16 by planting and planting them on the field by arranging the planted plants at right and left with a spacing between planting strips, and sliding the farm scene as it travels. Has a well-known basic structure in which a plurality of grounding floats 18 for leveling a planting planned farming scene are arranged at left and right intervals.
[0054]
  The fertilizer applicator 7 has a fertilizer hopper 19 mounted on the self-propelled machine 3 and is provided with a feeding device 20 that feeds the fertilizer in the fertilizer hopper 19 by a set amount in conjunction with planting operation. An electric fan 23 is provided that forms a groove and supplies a fertilizer that is fed into the groove, and generates an air flow for pumping the fed fertilizer through the hose 22 to the groove generator 21. It is provided and configured.
[0055]
  As shown in FIGS. 3 and 4, the transmission case 9 has a lateral input shaft 41 a that is wound around the output shaft 11 a of the engine 11 and interlocked via a transmission device 40, as shown in FIGS. 3 and 4. The switchable hydrostatic continuously variable transmission 41 is in a state in which its output is transmitted to the mission case 9 by a lateral shaft, and its input shaft 41a and the lateral output shaft 41b are disposed in the front-rear direction. It is connected.
[0056]
  The winding transmission device 40 winds a transmission belt 40c around an output pulley 40a attached to the output shaft 11a of the engine 11 and an input pulley 40b attached to the input shaft 41a of the hydrostatic continuously variable transmission 41, and this transmission A tension pulley 40d that applies tension to the belt 40b is provided.
[0057]
  An input shaft 41 a of the hydrostatic continuously variable transmission 41 extends through the front portion of the transmission case 9 to the other side. A shift lever 130 for operating the hydrostatic continuously variable transmission 41 is disposed on the left side of the steering handle 14.
[0058]
  Further, as shown in FIG. 4, a hydraulic pump 42 driven by the extended end portion of the input shaft 41 a of the hydrostatic continuously variable transmission 41 is connected to the left and right lateral sides of the transmission case 9. 3 and 4, on the upper surface of the transmission case 9, a torque generator 43 for hydraulic power steering interlocking with the handle shaft 14a of the steering handle 14 and a working device for controlling the elevating cylinder 6 are provided. An electromagnetic hydraulic control valve 44 for lifting operation is attached. The lifting cylinder 6, the hydraulic pump 42, the hydraulic control valve 44 and the like constitute lifting means for driving the seedling planting device 4 up and down.
[0059]
  The hydraulic system will be described in detail. The mission case 9 is used as a hydraulic oil tank, and the lubricating oil (hydraulic oil) in the mission case 9 is hydrostatically passed through an oil filter 45 attached to the left, right, left and right side surfaces of the mission case 9. The hydraulic oil supplied to the hydraulic continuously variable transmission 41 and the hydraulic pump 42 is supplied to the torque generator 43, and then supplied to the elevating cylinder 6 through the hydraulic control valve 44. The drain of the hydrostatic continuously variable transmission 41 is returned to the front axle case 8 communicating with the transmission case 9 to stop the operation of the elevating cylinder 6, that is, the hydraulic control valve when the elevating stop state is in effect. The drain 44 is returned to the mission case 9.
[0060]
  In the transmission case 9, as shown in FIGS. 5 and 6, the main clutch 50 that turns the output from the hydrostatic continuously variable transmission 41 on and off, and the output from the main clutch 50 in two stages, high and low. A sub-transmission device 51 for shifting and a differential mechanism 52 for transmitting the output from the sub-transmission device 51 to the left and right driving front wheels 1 are installed as components of the traveling transmission system, and the one-way clutch 53 and Of the transmission system (planting transmission system) to the seedling planting device 4 branched from the traveling transmission system by a planting transmission mechanism 54 for changing the power between the plants and a planting clutch 55 for switching on and off the power from now on It is installed as a component. That is, the main clutch 50 is provided as a clutch that turns on and off the transmission to the traveling unit and the seedling planting device 4.
[0061]
  The main clutch 50 is a wet multi-plate clutch, and a drive housing 58 is integrated with an input shaft 57 that is linked to an output shaft 41b of the hydrostatic continuously variable transmission 41 via a spline coupling 56. A cylindrical clutch output shaft 59, which is mounted in a rotating state and positioned in the axial direction positioning state, is mounted in a state where it can rotate relative to the input shaft 57 and can be shifted in the axial direction. And a disengaged state in which the interlock is released and the disengagement is performed when the driven housing 60 is moved in the axial direction relative to the drive housing 58 when the clutch output shaft 59 is shifted. The friction plate 61 that can be switched between the two is attached to the driven housing 60 and the drive housing 58 so that the driven housing 60 is in an interlocked state. And it is configured to provide a spring 62 which biases movement. In other words, the clutch engagement state (engaged state) appears by bringing the friction plate 61 into the interlocking state, and the clutch disengagement state (disconnection state) appears by bringing the friction plate 61 into the released state. Yes.
  The operation means for turning on and off the main clutch 50 is provided with a main clutch pedal CP which can be stepped on at the left side of the foot portion of the boarding operation unit 13, and the main clutch pedal CP is operated by stepping on the main clutch pedal CP. By rotating in one direction around the axis P perpendicular to the input shaft 57, the end face of the clutch output shaft 59 is pressed and the clutch output shaft 59 is moved in one direction against the bias by the spring 62. And a shift operation cam 63 that moves the clutch output shaft 59 in the opposite direction by the urging force by rotating in the opposite direction in accordance with the return operation by the urging force by releasing the depression operation of the main clutch pedal CP. Has been. In other words, the clutch output shaft 59 is pushed and moved by the shift operation cam 63 to bring out the clutch disengaged state, and the pressure on the clutch output shaft 59 by the shift operation cam 63 is released, whereby the clutch output shaft 59 is moved to the spring 62. The clutch engagement state is revealed by force movement, and the clutch output shaft 59 rotates together with the input shaft 57 when the clutch is disengaged due to friction between the shift operation cam 63 and the clutch output shaft 59. Co-rotation of the clutch output shaft 59 is prevented.
[0062]
  The sub-transmission device 51 is of a gear shift type, and is in a state in which a high-speed large-diameter transmission gear 65 and a low-speed small-diameter transmission gear 66 are integrally rotated on a transmission input shaft 64 and positioned in the axial direction. The high-speed position where the small-diameter gear portion 68 is engaged with the large-diameter transmission gear 65 and the low-speed position where the large-diameter gear portion 69 is engaged with the small-diameter transmission gear 66 and the neutral position where the small-diameter gear portion 69 is interlocked and interlocked with the transmission output shaft 67. Further, a shift gear 70 that can be shifted in the axial direction is mounted to rotate integrally.
  A small-diameter output gear 71, which meshes with the large-diameter transmission gear 65 and interlocks with the large-diameter transmission gear 65, is attached to the clutch output shaft 59 so as to rotate integrally, and the transmission input shaft 64 is decelerated to the clutch output shaft 59. It is linked. A sub-transmission lever 180 for operating the sub-transmission device 51 is disposed on the left and right side (left side) of the seat 15.
[0063]
  The differential mechanism 52 can be switched between a differential state in which the left and right driving front wheels 1 are differentiated and a non-differential state in which the lateral transmission shafts 72 to the left and right driving front wheels 1 are directly connected to each other and are not differentiated. is there. That is, a shift member 74 that is freely shiftable in the axial direction is attached to one lateral transmission shaft 72 so as to rotate integrally with a non-differential position that meshes and interlocks with the differential case 73 and a differential position that releases meshing and interlocking. By shifting the shift member 74 to the non-differential position, the lateral transmission shaft 72 and the differential case 73 are integrated to reveal the non-differential state, while the shift member 74 is shifted to the differential position. Accordingly, the differential transmission state appears by allowing relative rotation between the lateral transmission shaft 72 and the differential case 73. The differential lock operating means for switching the differential mechanism 52 between a differential state and a non-differential state is provided with a spring (not shown) that shifts the shift member 74 to the differential position. The differential mechanism 52 is reversibly switched from the differential state to the non-differential state against the biasing force of the spring as the differential lock pedal DP provided at the foot is depressed, that is, the shift member 74 is moved from the differential position. A means for reversibly shifting to a non-differential position.
  In the differential case 73 of the differential mechanism 52, an input gear 76 that meshes with and interlocks with a transmission output gear 75 that is mounted in a state of rotating integrally with the transmission output shaft 67, and a propeller shaft for transmission to the driving rear wheel 2. 77 is attached to an output gear 79 which meshes with and engages with the attached gear 78.
[0064]
  The one-way clutch 53 is provided so as to transmit only forward rotation of the rotation of the transmission input shaft 64 to the planting transmission system using the transmission input shaft 64 as a branch point from the traveling transmission system to the planting transmission system. ing.
[0065]
  The planting speed change mechanism 54 is mounted on a cylindrical planting speed change input shaft 82 that is mounted on the speed change output shaft 67 so as to be rotatable only relative to the output gear 80 of the one-way clutch 53 via a gear 81. A plurality of drive gears 83 having different diameters are mounted so as to rotate integrally, and a planting transmission output shaft 86 interlocked with the planting clutch 55 via bevel gears 84 and 85 is always meshed with each of the drive gears 83. A ball 89 for reversibly interlocking the driven gear 87 to the planting transmission output shaft 86 by mounting the driven gear 87 to be interlocked with each other and engaging the engaging recesses 88 formed in each of the driven gears 87. The planting speed change output shaft 86 is equipped so as to rotate integrally, and an operation shaft 90 for selectively engaging the ball 89 with the engaging recess 88 is provided. In other words, the driven gear 87 is selectively interlocked with the planting shift output shaft 86 so that the driven gear 87 used for transmission is changed to change the speed.
[0066]
  The front axle case 8 is internally provided with the lateral transmission shaft 72 and a transmission shaft for transmitting the power from the front axle to the front axle. The rear axle case 10 is transmitted from the transmission case 9 via the propeller shaft 77. A transmission mechanism for transmitting the incoming power to the driving rear wheel 2 is provided.
[0067]
  As shown in FIGS. 7, 8, and 9, the rear axle case 10 is a sideways transmission case in which a distribution transmission shaft 92 that distributes power to the left and right is linked to the propeller shaft 77 via bevel gears 90 and 91. And a gear for supporting the driving rear wheel 2 at the lower end thereof and transmitting the power of the distributing transmission shaft 92 to the axle 2A of the driving rear wheel 2 It consists of a pair of left and right vertical transmission case parts 95 that house a train 94.
[0068]
  A transmission system for the driving rear wheel 2, specifically, a multi-plate type in which transmission to the driving rear wheel 2 is completely separated between both ends of the distributing transmission shaft 92 and each gear train 94. A steering clutch 96 is interposed. These steering clutches 96 are provided with a movable clutch housing 96A that rotates integrally with the distributing transmission shaft 92 and is movable in the axial direction, and a fixed clutch housing 96B that is interlocked with the gear train 94, and a specific direction of the movable clutch housing 96A. A plurality of friction plates 96C that are brought into pressure contact with each other by movement in the axial direction to move to each other and interlock with friction and release frictional engagement with movement in the axial direction in the opposite direction are distributed and attached to the movable clutch housing 96A and the fixed clutch housing 96B. A clutch spring 96D is provided to move and urge the movable clutch housing 96A in a specific direction. That is, the movable clutch housing 96A is moved in the axial direction by the urging force of the clutch spring 96D in a specific direction, and the friction plate 96C is frictionally interlocked, whereby the fixed clutch housing 96B is interlocked with the movable clutch housing 96A to bring the clutch into an engaged state. The movable clutch housing 96A is moved in the axial direction in the opposite direction against the urging force to release the frictional interlocking, thereby disengaging the fixed clutch housing 96B from the movable clutch housing 96A and revealing the clutch disengaged state. It is configured as follows.
[0069]
  Of the transmission system to the driving front wheel 1 and the driving rear wheel 2, that is, the traveling unit, a transmission system part from the main clutch 50 to the steering clutch 96, specifically, a right vertical transmission case unit. As shown in FIG. 8, when the operating rod 98 is moved in a specific direction, the operating clutch 98 is pressed by the operating rod 98 between the movable clutch housing 96A and the movable clutch housing 96A. A movable clutch housing 96 </ b> A, that is, a traveling brake 99 that brakes the distribution transmission shaft 92 is interposed by interlocking connection. In other words, the traveling brake 99 is provided so as to act on a portion biased to the right side of the distribution transmission shaft 92.
[0070]
  100 is a brake operation shaft that reversibly press-moves the operation rod 98 from the brake release position to the brake operation position via the fork 101 by rotating in a specific direction around the first vertical axis P1; 102 slides and rotates on the transmission shaft 92 so as to reversibly press the movable clutch housing 96A from the clutch disengagement position to the clutch engagement position via the thrust collar 103 by moving in the axial direction in the opposite direction. The clutch sleeve 104 is freely fitted, and 104 is reversibly moved from the clutch engagement position to the clutch disengagement position via the cam 105 by rotating in a specific direction around the second longitudinal axis P2. This is a clutch operating shaft to be pressed and moved.
[0071]
  Then, as shown in FIG. 7, the brake operation shaft 100 rotates from the brake release phase to the brake operation phase in accordance with the depression operation of the brake pedal BP disposed at the right portion of the foot portion of the riding operation unit 13. In this manner, the brake pedal BP is interlocked and connected via the rod 110 in the front-rear orientation.
[0072]
  On the other hand, as the operation mechanism of the steering clutch 96, a steering clutch operation mechanism Z that reversibly turns the steering clutch 96 inside the turn in accordance with the steering operation beyond the set angle from the straight traveling state of the driving front wheel 1 is provided. It is provided.
[0073]
  As shown in FIGS. 7 to 11, the steering clutch operating mechanism Z is moved to the knuckle arm 118 of each of the driving front wheels 1 so as to be driven to swing left and right by the torque generator 43 to steer the driving front wheels 1. The pitman arm 111 is interlocked and connected to the pitman arm 111 via the push-pull rod 112 so as to swing around the longitudinal axis Y in accordance with the steering operation (left and right swing) of the pitman arm 111 interlocked and connected via the left and right drag links 119. The relay link 113 is provided, and the left clutch is moved by swinging in one direction around the longitudinal axis Y as the relay link 113 swings in one direction as the pitman arm 111 is steered to the left. The operating shaft 104 is pulled and rotated from the clutch engaged phase to the clutch disengaged phase via the rod 127 and the pitman arm 111 is rotated. As the relay link 113 swings in the opposite direction accompanying the steering to the side, the clutch operating phase 104 on the right side is engaged with the clutch 127 via the rod 127 by swinging in the opposite direction around the longitudinal axis Y. A distribution link 114 that interlocks with the relay link 113 is provided so as to rotate to the clutch disengagement phase, and the pitman arm 111 moves straight through the pin pivot connection hole 115 with the push-pull rod 112 of the pitman arm 111. Only when the pitman arm 111 is swung more than a set angle, the swing of the pitman arm 111 is transmitted to the push-pull rod 112 but is formed in a long hole that does not transmit the swing less than the set angle.
[0074]
  As shown in FIGS. 12 and 13, the sorting link 114 moves in the axial direction with respect to the interlocking lever 126 that swings integrally with the relay link 113 via the shaft 125 that supports the relay link 113. It is free to be engaged and interlocked with the interlocking lever 126 when it is in the close position, and is disengaged from the interlocking lever 126 when it is separated. That is, the steering clutch operating mechanism Z is switched to an operation state in which the steering clutch 96 on the inside of the turn is cut and operated in accordance with the steering operation exceeding the set angle of the driving front wheel 1 when the distribution link 113 is in the interlocking state. When the distribution link 113 is released, the steering clutch 96 is switched to a non-operating state in which the steering clutch 96 is not operated even when the driving front wheel 1 is steered beyond the set angle.
[0075]
  Of the operation device of the rice transplanter, switching operation means for switching the steering clutch operating mechanism Z between the operating state and the non-operating state, that is, the distribution link 114 is changed to the approach interlocking position a1 and the separation releasing position a2. As shown in FIGS. 7, 10, 12, and 13, the operation means for performing the state switching operation for changing between the interlocking position A <b> 1 and the release position A <b> 2 by swinging up and down around the first axis x <b> 1 in the horizontal direction. A lever 117 is disposed below the seat 15, a spring 120 is provided to move and urge the sorting link 114 to the approach interlocking position a <b> 1, and the sorting link 114 is swung in one direction around the second axis x <b> 2 in the lateral direction. The cam 121 is reversibly pressed and moved from the approach interlocking position a1 to the separation releasing position a2 against the urging force, and the state switching operation lever 117 is operated to the releasing position A2. The cam 121 swings to a release posture that positions the distribution link 114 at the separation release position a2, and when the state switching operation lever 117 is operated to the interlock position A1, the cam 121 moves the distribution link 114 to the close interlock position a1. A push-pull rod 122 for interlockingly connecting the state switching operation lever 117 and the cam 121 is provided so as to be in a swinging position in an interlocking position.
[0076]
  The cam 121 is configured to be able to self-hold in a released posture while pressing the sorting link 114 by arranging the second axial center x2 on the straight line along the pressing direction including the pressing point with respect to the sorting link 114. Has been.
[0077]
  Therefore, in this rice transplanter, the pedals installed at the foot portion of the boarding operation portion 13 are the brake pedal BP, the main clutch pedal CP, and the differential lock pedal DP, and the foot portion is refreshed. Workability etc. can be improved.
[0078]
[Second Embodiment]
  The first embodiment is modified as follows. That is, as shown in FIG. 14, the brake pedal BP and the main clutch pedal CP are brought close to the right side of the foot portion of the boarding operation unit 13 so that they can be stepped on separately and simultaneously can be stepped on with one foot F. Are arranged.
[0079]
[Third Embodiment]
  The first embodiment is modified as follows. That is, as shown in FIG. 15, the brake pedal BP and the main clutch pedal CP are brought close to the left part of the foot portion of the boarding operation unit 13 so that the brake pedal BP and the main clutch pedal CP can be stepped on separately and can be stepped on simultaneously with one foot F. Are arranged.
[0080]
[0081]
[No.4Embodiment]
  The first embodiment is modified as follows. That is, the figure16As shown in FIG. 3, as a switching operation means of the steering clutch operating mechanism Z, there is provided means for reversibly switching the steering clutch operating mechanism Z to a non-operating state by depressing the pedal AP. The pedal AP and the clutch pedal CP are arranged close to each other so that they can be stepped on separately and simultaneously pressed on one foot F.
[0082]
[No.5Embodiment]
  The first embodiment is modified as follows. That is, the figure17As shown in FIG. 3, as a switching operation means of the steering clutch operating mechanism Z, there is provided means for reversibly switching the steering clutch operating mechanism Z to a non-operating state by depressing the pedal AP. The pedal AP is arranged, and the brake pedal BP and the main clutch pedal CP are arranged close to each other on the right side of the foot portion of the boarding operation unit 13 so that they can be stepped on separately and simultaneously on one foot F. It is.
[0083]
[0084]
[No.6Embodiment]
  The first embodiment is modified as follows. That is, the figure18As shown in FIG. 4, as the switching operation means of the steering clutch operating mechanism Z, there is provided means for reversibly switching the steering clutch operating mechanism Z to the non-actuated state by the depression operation of the brake pedal BP.
[0085]
[No.7Embodiment]
  The first embodiment is modified as follows. That is, the figure19As shown in FIG. 4, as a switching operation means of the steering clutch operating mechanism Z, there is provided means for reversibly switching the steering clutch operating mechanism Z to a non-actuated state by depressing the brake pedal BP. The brake pedal BP and the main clutch pedal CP are arranged close to each other so that they can be stepped on separately and can be simultaneously stepped on with one foot F.
[0086]
[No.8Embodiment]
  The first embodiment is modified as follows. That is, the figure20As shown in FIG. 4, as a switching operation means of the steering clutch operating mechanism Z, there is provided means for reversibly switching the steering clutch operating mechanism Z to a non-actuated state by depressing the brake pedal BP. The brake pedal BP and the main clutch pedal CP are arranged close to each other so that they can be stepped on separately and simultaneously pressed on one foot F.
[0087]
[No.9Embodiment]
  Above6In the embodiment, it is modified as follows. That is, as the switching operation means of the steering clutch operation mechanism Z, means for reversibly switching the steering clutch operation mechanism Z to the non-actuated state by the depression operation of the main clutch dull CP is provided.
[0088]
[0089]
[0090]
[No.10Embodiment]
  1st to above9Each of the embodiments is modified as follows. That is,Figure21As shown, the traveling brake 99 is provided so as to act on the propeller shaft 77. The traveling brake 99 is an inward-expanding drum brake, and the interlocking connecting means for interlockingly connecting the brake pedal BP and the traveling brake 99 is provided with a bell crank 200, and the length for interlocking the bell crank 200 with the brake pedal BP. An adjustable turnbuckle-use rod 201 and a rod 202 for interlocking the bell crank 200 with the operating arm 99a of the traveling brake 99 are provided.
[0091]
[No.11Embodiment]
  1st to above9Each of the embodiments is modified as follows. In other words, the traveling brake 99 is provided to act on the movable clutch housing 96A of the left steering clutch 96. In other words, the traveling brake 99 is provided so as to act on a portion biased to the left side of the distribution transmission shaft 92.
[0092]
[Another embodiment]
  In the above embodiment, the steering clutch operating mechanism Z is switched by the operating force from the state switching operation lever 117 and the pedal AP. However, the hydraulic clutch or the electric motor that operates in response to the operation of the state switching operation lever 117 or the pedal AP is used. The steering clutch operating mechanism Z may be switched by an actuator of the type.
[Brief description of the drawings]
[Figure 1] Side view
[Fig. 2] Plan view
[Figure 3] Side view of the main part
[Fig. 4] Plan view of the main part
[Fig. 5] Cross-sectional view of the transmission mechanism in the mission case
[Fig. 6] Cross-sectional view of the transmission mechanism in the mission case
[Figure 7] Operation system diagram
FIG. 8 is a longitudinal rear view of the main part (right side) of the rear axle case.
FIG. 9 is a vertical rear view of the main part (left side) of the rear axle case.
FIG. 10 is a side view of the main part.
FIG. 11 is a plan view of the main part of the steering clutch operating mechanism.
FIG. 12 is a front view of the main part of the steering clutch operating mechanism.
FIG. 13 is a side view of the main part showing each state of the steering clutch operating mechanism.
FIG. 14 is a schematic plan view showing the pedal arrangement of the second embodiment.
FIG. 15 is a schematic plan view showing the pedal arrangement of the third embodiment.
FIG. 16 is a schematic plan view showing the pedal arrangement of the fourth embodiment.
FIG. 17 is a schematic plan view showing the pedal arrangement of the fifth embodiment.
FIG. 18 is a schematic plan view showing the pedal arrangement of the sixth embodiment.
FIG. 19 is a schematic plan view showing the pedal arrangement of the seventh embodiment.
FIG. 20 is a schematic plan view showing the pedal arrangement of the eighth embodiment.
FIG. 21Traveling brake operation system diagram of the tenth embodiment
[Explanation of symbols]
  1 Driving front wheel
  2 Drive rear wheel
  13 Boarding operation
  15 seats
  96 Steering clutch
  99 Traveling brake
  BP Brake pedal
  AP pedal
  Z steering clutch operating mechanism
  S operation step

Claims (2)

A traveling brake capable of braking the front driving wheel and the left and right driving rear wheels, and a single brake pedal, wherein the traveling brake can be operated only by the brake pedal. Work together
It has a right steering clutch that turns on and off the transmission to the right driving rear wheel, and a left steering clutch that turns on and off the transmission to the left driving rear wheel,
A right brake that can brake the right driving rear wheel is not provided between the right steering clutch and the right driving rear wheel, and a left brake that can brake the left driving rear wheel is provided to the left steering. Without preparing between the clutch and the left driving rear wheel,
The left and right steering clutches are reversibly turned off so that the steering clutch inside the turning is reversibly turned off only with the steering operation of a set angle or more from the straight traveling state of the driving front wheel . With a steering clutch operating mechanism,
The steering clutch operating mechanism and the brake pedal are configured to operate independently of each other so that the steering clutch operating mechanism can be switched between an operating state in which the steering clutch is operated and a non-operating state in which the steering clutch is not operated. configured,
An operation device for a paddy field work machine , wherein a pedal for reversibly switching the steering clutch operating mechanism to a non-actuated state by a stepping operation is disposed on the side opposite to the brake pedal in the lateral direction of the machine body . The operation device for paddy field working machines according to claim 1 , wherein the pedal is arranged at a driving step portion in the vicinity of the front side of the seat of the boarding driving section .

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