JP4086416B2 - Paddy field machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention is a paddy field work machine such as a rice transplanter, and more specifically, the transmission to each of the left and right driving rear wheels in accordance with the steering operation beyond the set angle from the straight traveling state of the left and right driving front wheels for steering. The present invention relates to a steering clutch operating mechanism that reversibly cuts and operates the left and right steering clutches that are separately turned on and off.
[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 such a paddy field work machine, what is seen in Japanese Utility Model Publication No. 17-17930 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]
  However, according to the above-mentioned conventional technology, the steering clutch on the inner side of the turning is always turned off and the driving rear wheel on the inner side of the turning is not driven at the time of the small turning with the driving front wheel steering beyond the set angle. In this state, the left and right driving front wheels and the rear driving wheel on the outside of the turn will be three-wheel drive. There was a risk of getting stuck.
[0005]
  An object of the present invention is to improve the traveling performance when the traveling resistance increases during a small turn when the front wheels are steered beyond a set angle.
[0006]
[Means for Solving the Problems]
  The features / actions / effects of the present invention according to claims 1 and 2 are as follows.
[0007]
[Features] (Claim 1)
  The left and right driving front wheels move straight from the straight drive state to the left and right driving rear wheels as the steering operation exceeds the set angle.Friction typeA steering clutch operating mechanism that reversibly cuts and operates one of the steering clutches inside the turning is provided.Switching operation means for switching the steering clutch operating mechanism between an operating state in which the steering clutch is operated and a non-operating state in which the steering clutch is not operated is provided.By depressing, the main clutch that turns on and off the transmission to the traveling unit and the paddy field work device is reversibly turned off and the traveling brake is reversibly braked.OneMain clutch / brake pedalIs provided on the side of the steering handle for steering the front wheels. Switch operation means below the seat behind the steering wheelIt is in the point provided.
[Features] (Claim 2)
  In the present invention according to claim 1, there is provided a differential mechanism capable of switching between a differential state in which the driving front wheels are differentiated and a non-differential state in which the front wheels are not differentially provided.
[0008]
[Action]
  Since the steering clutch operating mechanism is configured to be freely switchable between an operating state in which the steering clutch inside the turn is operated to be turned off and a non-operating state in which the steering wheel is not turned off in accordance with the steering operation over the set angle of the driving front wheel, By switching the steering clutch operating mechanism to the active state, the steering clutch can be operated while the steering clutch on the inner side of the turn can be cut and operated by simply turning the front drive wheel. By switching the mechanism to the non-operating state, it is possible to guarantee the transmission of the driving force to the left and right driving rear wheels without disengaging the steering clutch inside the turn even when the front wheels are steered beyond the set angle. .
  As a result, when the running resistance increases due to an increase in the tiller depth during a small turn, the differential mechanism is switched to the non-differential state and the steering clutch operating mechanism is deactivated. By switching, sufficient thrust can be obtained by driving all of the left and right driving front wheels and the left and right driving rear wheels.
  OneBy depressing the main clutch / brake pedal, the travel brake is braked and the main clutch is disengaged, so that the travel brake can be performed without overloading the engine.
[0009]
[effect]
  Therefore, the steering wheel can be steered beyond the set angle while the steering wheel on the inside of the turn can be turned and operated in a small turn with good operability simply by steering the driving wheel beyond the set angle. When the running resistance is increased during the small turn, the running performance can be improved.
[0010]
  The features of the present invention according to claim 3 are as follows.
[0011]
[Characteristic]
  In the present invention according to claim 1 or 2,The switching operation means is a state switching operation leverThere is a point.
[0012]
[0013]
[0014]
  The features of the present invention according to claim 4 are as follows.
[0015]
[Characteristic]
  In the present invention according to claim 1 or 2,The switching operation means is a release pedalIn the point.
[0016]
[0017]
[0018]
[0019]
[0020]
[0021]
[0022]
[0023]
[0024]
[0025]
[0026]
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 as an example of a paddy field working device via a four-link mechanism 5 so as to be movable up and down, and a hydraulic cylinder is used to drive the seedling planting device 4 up and down. An elevating cylinder 6 is provided, and a fertilizer application device 7 is provided.
[0027]
  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.
[0028]
  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.
[0029]
  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 right and left intervals.
[0030]
  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.
[0031]
  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.
[0032]
  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.
[0033]
  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.
[0034]
  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 elevating cylinder 6, the hydraulic pump 42, the hydraulic control valve 44, etc. constitute elevating means for driving the seedling planting device 4 up and down.
[0035]
  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 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 step transmission 41 and the hydraulic pump 42 is supplied to the torque generator 43, and then supplied to the lift 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.
[0036]
  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.
[0037]
  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 / brake pedal CBP that can be stepped on at the right side of the foot portion of the boarding operation unit 13, and an axis that is orthogonal to the input shaft 57. By rotating in one direction around P, the end face of the clutch output shaft 59 is pressed to move the clutch output shaft 59 in one direction against the urging by the spring 62 and in the opposite direction. As a result, a shift operation cam 63 for moving the clutch output shaft 59 in the opposite direction by the urging force is provided, and the shift operation cam 63 rotates in one direction in accordance with the depression operation of the main clutch / brake pedal CBP, and The shift operation cam 63 is rotated in the opposite direction in accordance with the return operation by the urging force by releasing the depression operation of the main clutch / brake pedal CBP. And it is configured to provide a linkage mechanism for interlocking connecting the pitch and brake pedal CBP and the shift operating cam 63. In other words, the clutch output shaft 59 is pushed and moved in one direction 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. The clutch 62 is moved in the opposite direction by the force of the spring 62 so that the clutch engagement state appears. The friction between the shift operation cam 63 and the clutch output shaft 59 causes the clutch output shaft 59 to be input when the clutch is disengaged. The so-called clutch output shaft 59 that rotates with the shaft 57 is prevented from rotating together. The interlocking mechanism is attached to the pedal shaft PS that rotates integrally with the main clutch / brake pedal CBP so that the rotating arm PSa rotates integrally, the passive arm 63a is fixed to the shift operation cam 63, and the rotating arm PS1. And an interlocking rod RR that interlocks and connects the passive arm 63a.
[0038]
  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 interlocked with the small-diameter transmission gear 66 and the neutral position which is not 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.
[0039]
  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. 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.
[0040]
  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.
[0041]
  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 linked to the planting shift output shaft 86 so that the driven gear 87 used for transmission is changed to change the speed.
[0042]
  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.
[0043]
  As shown in FIGS. 7 to 9, the rear axle case 10 includes a lateral transmission case portion 93 that internally houses a distribution transmission shaft 92 that distributes power to the left and right in conjunction with the propeller shaft 77 via bevel gears 90 and 91. A gear train 94 that is connected to the left and right ends of the lateral transmission case 93 and supports the driving rear wheel 2 at its lower end and transmits the power of the distribution transmission shaft 92 to the axle 2A of the driving rear wheel 2 is provided. It consists of a pair of left and right vertical transmission case parts 95 that are housed.
[0044]
  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, which 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.
[0045]
  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 traveling brake 99 that brakes the movable clutch housing 96A by interlocking connection is provided. That is, the traveling brake 99 is provided so as to act on a portion that is biased to the right side of the distribution transmission shaft 92.
[0046]
  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.
[0047]
  As shown in FIG. 7, the brake operation shaft 100 is moved back and forth with respect to the main clutch / brake pedal CBP so as to rotate from the brake release phase to the brake operation phase in accordance with the depression of the main clutch / brake pedal CBP. The rods 110 are connected to each other through the rod 110 in the orientation posture. The main clutch 50 is reversibly disengaged by the first-step depression operation until the middle of the operation range of the main clutch / brake pedal CBP, and the end of the operation range where the main clutch / brake pedal CBP continues is reached. The main clutch / brake pedal CBP is linked to the main clutch 50 and the travel brake 99 so that the travel brake 99 is reversibly actuated by the second stepping operation. That is, the main clutch / brake pedal CBP is reversibly disengaged by the first stepping operation to the middle of the operating range, and the second stepping operation is performed to the end of the operating range. A pedal that brakes the traveling brake 99.
[0048]
  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.
[0049]
  As shown in FIGS. 7 and 10, 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.
[0050]
  As shown in FIGS. 11 to 13, the distribution 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.
[0051]
  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.
[0052]
  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.
[0053]
  Therefore, in this rice transplanter, the pedals installed at the foot portion of the boarding operation unit 13 are the main clutch / brake pedal CBP and the diff lock pedal DP, and the foot portion is refreshed. Walking workability can be improved.
[0054]
[Second Embodiment]
  In the first embodiment, as a switching operation means for the steering clutch operation mechanism Z, a means for switching the steering clutch operation mechanism Z by operating the state switching operation lever 117 is not provided, but as shown in FIG. A means for reversibly switching the steering clutch operating mechanism Z to a non-actuated state by depressing the pedal AP is provided, and the release pedal AP and the main clutch / brake pedal CBP are distributed to the left and right at the foot of the boarding operation unit 13. Arrange in the state. The release pedal AP is depressed by one foot on the left and right, and at the same time, the main clutch / brake pedal CBP can be depressed on the other foot on the left and right.
[0055]
[Third Embodiment]
  In the first embodiment, as a switching operation means for the steering clutch operation mechanism Z, a means for switching the steering clutch operation mechanism Z by operating the state switching operation lever 117 is not provided, but as shown in FIG. A means for reversibly switching the steering clutch operating mechanism Z to a non-actuated state by depressing the pedal AP is provided, and the release pedal AP and the diff lock pedal DP can be depressed separately at the foot of the boarding operation unit 13. In addition, they are arranged close to each other so that they can be stepped on simultaneously with one foot F.
[0056]
[Fourth Embodiment]
  In the first embodiment, as a switching operation means for the steering clutch operation mechanism Z, a means for switching the steering clutch operation mechanism Z by operating the state switching operation lever 117 is not provided, but as shown in FIG. Means for reversibly switching the steering clutch operating mechanism Z to the non-actuated state by depressing the pedal AP is provided, and the release pedal AP and the main clutch / brake pedal CBP are separately provided at the feet of the boarding operation unit 13. They are placed close to each other so that they can be stepped on and can be stepped on simultaneously with one foot F.
[0057]
[Fifth Embodiment]
  In each of the first to fourth embodiments, the main clutch 50 is reversibly disengaged by the first-step depression operation until the middle of the operation range of the main clutch / brake pedal CBP, and the main clutch / brake pedal CBP is operated. The travel brake 99 is not reversibly braked by the second step depression operation until the end of the subsequent operation range, but the first step depression operation is performed halfway through the operation range of the main clutch / brake pedal CBP. The traveling brake 99 is reversibly braked by the movement, and the main clutch 50 is reversibly disconnected by the second stepping operation until the end of the operation range where the main clutch / brake pedal CBP continues. . In this case, the seedling planting device 4 can be operated in a state in which the traveling brake 99 is braked and the self-propelled machine body 3 is stopped and held by depressing the main clutch / brake pedal CBP in the first step.
[0058]
[Sixth Embodiment]
  In each of the first to fifth embodiments, the traveling brake 99 is not provided so as to brake the portion that is biased to the right side of the distribution transmission shaft 92, but as shown in FIG. A traveling brake 99 is provided so as to act as a brake. The traveling brake 99 is an inward-expanding drum brake, and an interlocking connecting means for interlockingly connecting the main clutch / brake pedal CBP and the traveling brake 99 is provided with a bell crank 200, which is connected to the main clutch / brake pedal. A length-adjustable turnbuckle-use rod 201 linked to the CBP and a rod 202 that links the bell crank 200 to the operating arm 99a of the traveling brake 99 are provided.
[0059]
[Seventh Embodiment]
  In each of the first to fifth embodiments, the travel brake 99 is not provided so as to brake the portion biased to the right side of the distribution transmission shaft 92, but to the portion biased to the left side of the distribution transmission shaft 92. A traveling brake 99 is provided so as to act as a brake.
[0060]
[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 release pedal AP. However, the hydraulic type is operated in accordance with the operation of the state switching operation lever 117 and the release pedal AP. Alternatively, the steering clutch operating mechanism Z may be switched by an electric actuator.
[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 travel brake operation system diagram of the sixth embodiment.
[Explanation of symbols]
  1 Driving front wheel
  2 Drive rear wheel
  4 Paddy field equipment
  14 Steering handle
  15 seats
  50 Main clutch
  52 Differential mechanism
  96 Steering clutch
  99 Traveling brake
  117 State switching operation lever
  CBP Main clutch / brake pedal
  AP release pedal
  Z steering clutch operating mechanism

Claims (4)

The left and right friction type steering clutches that turn the transmission to the left and right driving wheels separately according to the steering operation beyond the set angle from the straight drive state of the left and right driving front wheels for steering. Provide a steering clutch operating mechanism that reversibly cuts and operates
A switching operation means for switching the steering clutch operating mechanism between an operating state for operating the steering clutch and a non-operating state for not operating the steering clutch;
One main clutch / brake pedal that reversibly engages and disengages the main clutch that engages and disengages transmission to the traveling unit and the paddy field work device when the stepping operation is performed, Provided on the side of the steering handle for steering
A paddy field work machine in which the switching operation means is provided below the seat behind the steering wheel .   2. The paddy field work machine according to claim 1, further comprising a differential mechanism capable of switching between a differential state in which the driving front wheels are differentiated and a non-differential state in which the driving front wheels are not differentiated. The paddy field work machine according to claim 1 or 2, wherein the switching operation means is a state switching operation lever . The paddy field work machine according to claim 1 or 2, wherein the switching operation means is a release pedal .

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