JP2000350506A - Device for operating paddy working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable to carry out a traveling braking in a good operation without badly forcing an engine. SOLUTION: In this device for operating a paddy working machine, a steering clutch operation mechanism Z which changes over an action state and a non- action state by reversibly putting off the clutch inside of turning out of lateral steering clutches 96 for putting on and off a transmission to each of lateral rear drive wheels depending on a steering action larger than the predetermined angle from a straight driving state of steering drive wheels 1, a main clutch pedal CP for operating to put on and off a main clutch 50 which puts on and off a transmission to a traveling unit and a paddy working device and a brake pedal BP for braking a traveling brake 99 are installed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to left and right steering in which transmission to right and left driving rear wheels is completely separated from a straight driving state of a steering front driving wheel by a steering operation at a set angle or more. A steering clutch operating mechanism for reversibly disengaging and operating the clutch inside the turning, a main clutch pedal for on / off operation of the main clutch for turning on / off the transmission to the traveling unit and the paddy field working device, and braking the traveling brake The present invention relates to an operation device for a paddy field working machine such as a rice transplanter provided with a brake pedal for operating the paddy field working machine.

[0002]

2. Description of the Related Art In a paddy field working machine of this type, the main clutch pedal is depressed to operate the main clutch to be disengaged, and the brake pedal is depressed to operate the traveling brake so that the engine is forced. It is possible to perform traveling braking by braking the front drive wheel and the rear drive wheel without applying the brake. In addition, in this type of paddy field machine, a simple small-turning operation with little field destruction can be achieved by simply performing a steering operation on the front drive wheel, disengaging the steering clutch on the inside of the turn, and rotating the rear rear drive wheel on the inside of the turn. Can be performed with good operability.

[0003] As an operating device for such a paddy field working machine, there is conventionally known an operating device disclosed in Japanese Utility Model Publication No. 1-179030. That is, as the steering clutch operating mechanism, when the drive front wheel is steered to a set angle or more,
A mechanism for disengaging the steering clutch inside the turning was provided.

[0004]

According to the above prior art, when the steering angle of the driving front wheels is smaller than the set angle, the brake pedal of the traveling brake provided to act on the transmission system to the traveling section is operated. By the braking operation accompanying the stepping-in braking operation, all of the left and right driving front wheels and the left and right driving rear wheels are braked, and stable running braking can be performed. On the other hand, when the driving front wheel is steered beyond the set angle, the steering clutch inside the turning is disengaged with the steering operation, so the brake pedal is depressed to operate the travel brake. In such a case, the driving rear wheel on the inside of the turn is not braked, and the traveling braking is performed by braking the left and right front drive wheels and the drive rear wheel on the outside of the turn. By the way, in work traveling on a field, it is necessary to make a small turn with the steering clutch on the inside of the turn disengaged, but such a small turn performance is required when traveling or entering or leaving the field. Without
Rather, braking performance that can perform stable running braking by braking all wheels is more strongly required. Therefore, a traveling brake that acts on the lower transmission side of each of the transmission clutches in the transmission system to the left and right driving rear wheels is provided.
It is conceivable that even if the driving front wheel is steered beyond the set angle and the steering clutch inside the turning is disengaged, it is possible to perform traveling braking by braking all wheels, but in this case, Since two traveling brakes are required, the structure is complicated and the cost is increased.

[0005] An object of the present invention is to provide a stable running brake by braking all the wheels by means of a simple and inexpensive means, even if the driving front wheels are steered beyond a set angle. The point is to do so.

[0006]

The features, functions and effects of the present invention according to claim 1 are as follows.

[Features] Of the left and right steering clutches, the right and left driving clutches, which transmit the power to the left and right driving rear wheels separately from each other according to the steering operation beyond the set angle from the straight driving state of the steering front driving wheel. A steering clutch operating mechanism for reversibly turning off and on the main unit, a main clutch pedal for turning on and off a main clutch for turning on and off the transmission to the traveling unit and the paddy field working device, and a brake for operating the running brake An operating device for a paddy field working machine provided with a pedal, wherein the steering clutch operating mechanism is configured to be freely operable to switch 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 there.

[Action] The steering clutch operating mechanism can be freely switched between an operating state in which the steering clutch on the inside of the turn is disengaged and a non-operating state in which the steering operation is not disengaged in accordance with the steering operation of the drive front wheel beyond the set angle. Because the steering clutch operating mechanism is switched to the operating state during work traveling, the steering clutch on the inside of turning can be disengaged by simply performing the steering operation on the front wheels of the drive. While turning, the steering clutch operating mechanism is switched to the non-operating state when traveling, entering or leaving the field, etc. Also, by depressing the brake pedal, it is possible to perform stable running braking by braking all of the front driving wheel and the left and right driving rear wheels. In addition, by switching the steering clutch operating mechanism to a non-operating state, even when the front drive wheel is steered beyond a set angle, the drive force is transmitted to the left and right drive rear wheels without disengaging the inside steer clutch. If the thrust is insufficient when turning the front wheels more than the set angle due to the deep tillage depth, etc., the steering clutch operating mechanism is switched to the non-operating state. The driving mode is changed from the driving mode using the front driving wheel and the driving rear wheel on the outside of the turning to the driving mode using the front driving wheel and the left and right driving rear wheels, and the thrust can be increased. Of course, even when turning by steering the front wheel at a set angle or more at the time of traveling or entering or leaving the field, by switching the steering clutch operating mechanism to the inactive state, the drive front wheel and the left and right drive are switched. By adopting a driving mode using the rear wheels, the thrust can be increased.

[Effect] Accordingly, the steering clutch operating mechanism can be freely switched between the operating state and the non-operating state while the good turning operation can be performed by disengaging the steering clutch inside the turning with good operability. With a simple and inexpensive means, even when the front drive wheel is steered beyond the set angle, stable braking by braking all the wheels and powerful braking by driving all the wheels You can now do promotion.

The features, functions and effects of the present invention according to claim 2 are as follows.

[Features] In the present invention according to the first aspect, the switching operation means of the steering clutch operation mechanism includes:
The point is that means for switching the steering clutch operating mechanism by operating the lever is provided.

[Operation] Since the steering clutch operating mechanism is switched by manual operation of the lever, the switching of the steering clutch operating mechanism may hinder the desired operation of the main clutch pedal and the brake pedal. Absent.

[Effect] Accordingly, the desired main clutch operation and traveling brake operation can be performed well, while the steering clutch operating mechanism can be switched between the active state and the non-active state.

The features, functions and effects of the present invention according to claim 3 are as follows.

[Features] In the present invention according to the first aspect, the switching operation means of the steering clutch operation mechanism includes:
The point is that means is provided for reversibly switching the steering clutch operating mechanism to the non-operating state by depressing the pedal.

[Operation] The steering clutch operation mechanism is reversibly switched to the non-operation state by depressing the pedal, and the steering clutch operation mechanism is returned to the operation state by releasing the depression operation on the pedal. As a result, the steering clutch operating mechanism can be maintained in the operating state unless the pedal is depressed. That is, there is no forgetting to return the steering clutch operating mechanism to the operation state.

[Effects] Accordingly, when the vehicle is traveling or traveling, or when entering or exiting a field, the front drive wheel is steered to a predetermined angle or more to turn the vehicle, or the vehicle is braked, or driven by the left and right rear wheels. When the left and right driving rear wheels are to be driven during turning while steering the front driving wheels at a set angle or more during work traveling, this can be achieved by simply depressing the pedal when necessary, and moreover However, it has become possible to guarantee a small turning without causing the field to be broken without forgetting the operation.

The features, functions and effects of the present invention according to claim 4 are as follows.

[Features] In the present invention according to the third aspect, the pedal and the brake pedal are arranged so that they can be individually depressed and operated simultaneously with one foot.

[Operation] To perform traveling braking by braking the left and right driving rear wheels in a turn in which the driving front wheel is steered to a predetermined angle or more, the main clutch is disengaged and the traveling brake is actuated. While the steering clutch operating mechanism needs to be switched to the non-operating state, the main clutch must be disengaged in order to drive the left and right driving rear wheels together in a turn in which the front driving wheel is steered beyond the set angle. It is necessary to switch the steering clutch operating mechanism to a non-operating state without operating the traveling brake and without operating the traveling brake.
Paying attention to this point, the pedal and the brake pedal are arranged so that they can be depressed separately and can be depressed simultaneously with one foot. When running braking by braking the rear wheels, the main clutch is disengaged by simultaneously depressing the pedal and brake pedal with one foot and depressing the main clutch pedal with the other foot. The driving brake can be operated and the steering clutch operating mechanism can be switched to the non-operating state. When the vehicle is to be depressed, only the pedal is depressed to operate the travel brake without disengaging the main clutch. Rukoto without steering clutch operation mechanism can be a switch to a non-activated condition.

[Effects] Therefore, in a turn in which the front drive wheel is steered to a predetermined angle or more, an operation for braking the left and right drive rear wheels to perform running braking and a steering operation for driving the front drive wheel to a predetermined angle or more. It is now possible to perform any of the operations for driving the vehicle by driving the left and right driving rear wheels together during the turning.

The features, functions and effects of the present invention according to claim 5 are as follows.

[Features] In the present invention according to the third aspect, the pedal and the main clutch pedal are arranged close to each other so that they can be individually depressed and operated simultaneously with one foot.

[Operation] To perform traveling braking by braking the left and right driving rear wheels in a turn in which the front driving wheel is steered to a predetermined angle or more, the main clutch is disengaged and the traveling brake is actuated. While the steering clutch operating mechanism needs to be switched to the non-operating state, the main clutch must be disengaged in order to drive the left and right driving rear wheels together in a turn in which the front driving wheel is steered beyond the set angle. It is necessary to switch the steering clutch operating mechanism to a non-operating state without operating the traveling brake and without operating the traveling brake.
Paying attention to this point, the pedal and the main clutch pedal are arranged so that they can be depressed separately and simultaneously depressed with one foot. When the vehicle is being braked by driving the rear wheel, the pedal and the main clutch pedal are simultaneously depressed with one foot, and the main clutch is disengaged by depressing the brake pedal with the other foot. It is possible to actuate the traveling brake, apply the braking operation, and switch the steering clutch operating mechanism to the non-operating state. When traveling, depress the pedal only to operate the traveling brake without disengaging the main clutch. Steering clutch operation mechanism can be a switch to non-activated condition without.

[Effects] Therefore, in a turn in which the front drive wheel is steered beyond a set angle, an operation for braking the traveling by braking the left and right drive rear wheels, and a steering operation for turning the front drive wheel beyond the set angle. It is now possible to perform any of the operations for driving the vehicle by driving the left and right driving rear wheels together during the turning.

The features, functions and effects of the present invention according to claim 6 are as follows.

[Features] In the present invention according to the first aspect, the switching operation means of the steering clutch operation mechanism includes:
There is provided a means for reversibly switching the steering clutch operating mechanism to a non-operating state by depressing the brake pedal.

Focusing on the fact that it is necessary to switch the steering clutch operating mechanism to the non-operating state when the traveling brake is braked, the steering clutch operating mechanism is operated by depressing the brake pedal. Is reversibly switched to the non-operation state, so that only the depressing brake operation on the brake pedal is required while the steering clutch operating mechanism is switched to the non-operation state.

[Effect] Accordingly, the steering clutch operating mechanism can be switched with good operability.

The features, functions and effects of the present invention according to claim 7 are as follows.

[Features] In the present invention according to claim 1, as the switching operation means of the steering clutch operation mechanism,
There is provided a means for reversibly switching the steering clutch operating mechanism to a non-operating state by depressing the main clutch pedal.

Focusing on the fact that it is necessary to switch the steering clutch operating mechanism to the non-operating state when the main clutch is disengaged and the traveling brake is actuated, the main clutch pedal is depressed. Since the steering clutch operating mechanism is reversibly switched to the non-operating state by the operation, it is only necessary to depress the main clutch pedal while switching the steering clutch operating mechanism to the non-operating state.

[Effect] Accordingly, the steering clutch operating mechanism can be switched with good operability.

The features, functions and effects of the present invention according to claim 8 are as follows.

[Features] The above-mentioned claims 1, 2, 3, 4, 5,
In the present invention according to the sixth and seventh aspects, the main clutch pedal and the brake pedal are arranged so that they can be individually depressed and operated simultaneously with one foot.

[Operation] In performing traveling braking, the main clutch pedal and the brake pedal are arranged so that they can be simultaneously depressed with one foot by focusing on disengaging the main clutch and operating the traveling brake. Thus, while the main clutch is disengaged and the traveling brake is operated for braking, only one foot operation is required for the operation.

[Effects] Therefore, the traveling braking can be performed with good operability.

The features, functions and effects of the present invention according to claim 9 are as follows.

[Characteristics] The above claims, 2, 3, 4, 5,
In the present invention according to 6, 7, and 8, in the transmission system to the left and right driving rear wheels, for a portion biased to the left or right side of the distribution transmission shaft that distributes the power from the propeller shaft to the left and right steering clutches. The point is that a traveling brake is provided to perform a braking action.

[Operation] Since the traveling brake is offset to the left and right, the traveling brake is arranged on the same side as the brake pedal, so that the rod for interlocking the brake pedal and the traveling brake is moved in the longitudinal direction. That is, it is possible to dispose in the posture along the body frame, and it is possible to minimize interference with the body frame. In addition, since the interlocking connection mechanism between the brake pedal and the traveling brake is disposed on the left and right outer sides, it is easy to perform maintenance on the interlocking connection mechanism from the left and right outer sides.

[Effect] Therefore, the interlocking connection mechanism between the brake pedal and the traveling brake can be made simple, inexpensive, and easy to maintain.

The features, functions and effects of the present invention according to claim 10 are as follows.

[Features] The above-mentioned claims 1, 2, 3, 4, 5,
The present invention according to 6, 7, 8 is characterized in that a traveling brake is provided so as to exert a braking action on a propeller shaft in the transmission system to the left and right driving rear wheels.

[Operation] Since the traveling brake is provided so as to exert a braking action on the propeller shaft located forward of the driving rear wheel, the distance between the brake pedal and the traveling brake is short, and the brake pedal and the traveling brake are provided. The interlocking connection mechanism for interlocking and linking can be made short with little bending of the rod, etc., so that the operating force can be efficiently transmitted from the brake pedal to the traveling brake.

[Effect] Therefore, the response of the traveling brake to the brake pedal can be improved.

The features, functions and effects of the present invention according to claim 11 are as follows.

[Characteristics] The above claims, 2, 3, 4, 5,
The present invention according to 6, 7, 8, 9, 10 is characterized in that there are two left and right driving front wheels and a differential lock operating means for switching a differential mechanism for these driving front wheels between a differential state and a non-differential state is provided. is there.

[Operation] The differential mechanism for the left and right driving front wheels can be freely switched between a differential state in which the driving front wheels are differential and a non-differential state in which the driving front wheels are not differentially operated. By switching to the differential state,
When driving can be performed smoothly and strong thrust is required, such as when the tillage is deep, switching the differential mechanism to the non-differential state can drive the left and right driving front wheels equally to obtain strong thrust. it can. In particular, when the differential mechanism is switched to the non-differential state and the steering clutch operating mechanism is switched to the non-operating state, four-wheel drive of the left and right driving front wheels and the left and right driving rear wheels is performed, and the cultivator is deep, In addition, it is possible to further improve the running performance when the driving front wheel is steered beyond the set angle and the running resistance is large.

[Effects] Accordingly, good running performance can be exhibited on both the smooth surface and the running surface.

[0050]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] As shown in FIGS. 1 and 2, a rice transplanter, which is an example of a paddy working machine, has a pair of left and right driving front wheels 1 and a pair of left and right driving front wheels. A multi-row planting seedling planting device 4, which is an example of a paddy field working device, is connected to a rear portion of a riding type self-propelled body 3 equipped with a wheel 2 via a four-link mechanism 5 so as to be movable up and down. An elevating cylinder 6 using a hydraulic cylinder that drives the seedling planting apparatus 4 up and down is provided, and a fertilizer application apparatus 7 is provided.

As shown in FIGS. 3 and 4, the self-propelled body 3 has a transmission case 9 for supporting the driving front wheel 1 via a front axle case 8 and a transmission case 9 for supporting the driving rear wheel 2. The engine 11 is mounted at a position near the front of the transmission case 9 of the fuselage frame having the axle case 10 and the output shaft 11a of the engine 11 is positioned laterally via the vibration isolating rubber 12 (an example of a vibration isolating material). In addition, a boarding operation unit 13 is mounted in a state located behind the engine 11.

The boarding operation section 13 includes a steering handle 14 for steering the front wheel 1, a seat 15 located behind the steering wheel 14, a driving step S, and the like. The operation step S is arranged above the transmission case 9.

The seedling planting apparatus 4 is provided with a seedling stand 16 which is driven to reciprocate at a set stroke in the left-right direction, and moves up and down between the seedling outlet and the field in conjunction with the movement of the seedling stand 16. A plurality of planting mechanisms 17 for taking out the seedlings on the seedling stand 16 by the planting unit amount and planting them in the field by circulating the seedlings on the seedling stand 16 are arranged on the left and right with a spacing between the planting strips. It has a well-known basic structure in which a plurality of ground floats 18 for leveling a field to be planted by sliding are arranged at right and left intervals.

The fertilizer applicator 7 has a fertilizer hopper 19 mounted on the self-propelled machine body 3, and feeds out the fertilizer in the fertilizer hopper 19 by a set amount in conjunction with the planting operation.
And a groove generator 21 for forming a fertilizer groove in the field as the vehicle travels and supplying the fertilizer sent into the groove, and feeding the fed fertilizer to the groove generator 21 via a hose 22. And an electric fan 23 for generating an airflow for performing the operation.

As shown in FIGS. 3 and 4, a lateral input shaft 41a is provided around the output shaft 11a of the engine 11 and interlocked therewith via a transmission 40, as shown in FIGS. The hydrostatic continuously variable transmission 41, which can be switched between forward and backward, outputs its output to the transmission case 9
Into a state of being transmitted by a horizontal shaft, and the input shaft 41 thereof.
a and the lateral output shaft 41b are connected in a state of being disposed in front and rear.

The wrapping transmission 40 is provided with the engine 1
A transmission belt 40c is wound around an output pulley 40a attached to the output shaft 11a and an input pulley 40b attached to the input shaft 41a of the hydrostatic continuously variable transmission 41, and a tension pulley for applying tension to the transmission belt 40b. 40d is provided.

The input shaft 4 of the hydrostatic continuously variable transmission 41
Reference numeral 1a extends to the other side through the front of the transmission case 9. A shift lever 130 for operating the hydrostatic continuously variable transmission 41 is arranged on the left side of the steering handle 14.

As shown in FIG. 4, a hydraulic pump 42 driven by the extended end of the input shaft 41a of the hydrostatic stepless transmission 41 is provided on the other side of the transmission case 9 on the right, left, and other sides. As shown in FIGS. 3 and 4, the upper surface of the transmission case 9 controls a torque generator 43 for hydraulic power steering interlocked with a handle shaft 14a of the steering handle 14 and the lifting cylinder 6 as shown in FIGS. And an electromagnetic hydraulic control valve 44 for lifting and lowering the working device. The lifting cylinder 6, the hydraulic pump 42, the hydraulic control valve 44, and the like constitute lifting means for driving and raising and lowering the seedling planting apparatus 4.

The hydraulic system will be described in detail. The transmission case 9 is used as a hydraulic oil tank, and lubricating oil (hydraulic oil) in the transmission case 9 passes through an oil filter 45 attached to the left, right, left and other side surfaces of the transmission case 9. Is supplied to the hydrostatic continuously variable transmission 41 and the hydraulic pump 42, and the pressure oil from the hydraulic pump 42 is supplied to the torque generator 43, and then supplied to the lifting cylinder 6 through the hydraulic control valve 44. ing. Then, the drain of the hydrostatic continuously variable transmission 41 is returned to the front axle case 8 communicating with the transmission case 9, and the hydraulic control valve when the operation of the elevating cylinder 6 is stopped, that is, in the elevating stopped state. The drain 44 is returned to the mission case 9.

Then, in the mission case 9,
As shown in FIGS. 5 and 6, the hydrostatic continuously variable transmission 4
1, a main clutch 50 for turning on and off the output from the main clutch 50, a sub-transmission 51 for shifting the output from the main clutch 50 to high and low, and transmitting the output from the sub-transmission 51 to the left and right driving front wheels 1. A differential mechanism 52 is installed as a component of the traveling power transmission system, and a one-way clutch 53, a planting transmission mechanism 54 for changing between plants for shifting the power from here on, and a planting clutch 55 for turning on and off the power from there. Is installed as a component of a transmission system (planting transmission system) to the seedling planting apparatus 4 branched from the traveling transmission system.
That is, the main clutch 50 is provided as a clutch that switches on and off transmission to the traveling unit and the seedling planting apparatus 4.

The main clutch 50 is a wet-type multi-plate clutch, and is connected to an output shaft 41b of the hydrostatic continuously variable transmission 41 via a spline coupling 56. A driven housing having a cylindrical clutch output shaft 59 mounted integrally with the input shaft 57 so as to be rotatable relative to the input shaft 57 and mounted so as to be shiftable in the axial direction. 60 is mounted in a state of rotating integrally and positioned in the axial direction, and the interlocking state and the interlocking state in which both are interlocked by the axial movement of the driven housing 60 with respect to the drive housing 58 with the shift of the clutch output shaft 59 are released. A friction plate 61 that can be switched to the release state is separately mounted on the driven housing 60 and the drive housing 58, and the driven housing 60 And it is configured spring 62 to move urging the interlocking state is provided. In other words, the clutch is engaged (engaged state) by bringing the friction plate 61 into the interlocked state.
, And the clutch disengaged state (disengaged state) is revealed by bringing the friction plate 61 into the released state. The operating means for turning the main clutch 50 on and off is provided with a main clutch pedal CP which can be depressed freely at the left side of the foot portion of the boarding operation unit 13,
By rotating in one direction around an axis P orthogonal to the input shaft 57 in accordance with the depressing operation of the main clutch pedal CP, the end surface of the clutch output shaft 59 is pressed to be urged by the spring 62. In contrast, the clutch output shaft 59 is moved in one direction, and is rotated in the opposite direction with the return operation by the urging force due to the release of the depression operation of the main clutch pedal CP. The shift operation cam 63 for moving in the opposite direction is provided. In other words, the clutch output shaft 59 is pressed and moved by the shift operation cam 63 to display the clutch disengaged state, and the clutch output shaft 59 is released from the spring 62 by releasing the shift operation cam 63 from pressing the clutch output shaft 59. The shift operation cam 6 is moved by force to show the clutch engaged state.
The friction between the clutch output shaft 59 and the clutch output shaft 59 prevents the clutch output shaft 59 from rotating together with the input shaft 57 when the clutch is disengaged.

The auxiliary transmission 51 is of a gear shift type, in which both 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. It is mounted in the centered position, and is not linked to the high-speed position where the small-diameter gear portion 68 meshes with the large-diameter transmission gear 65 and the low-speed position where the large-diameter gear portion 69 meshes and interlocks with the small-diameter transmission gear 66 on the transmission output shaft 67. A shift gear 70 that can be shifted in the axial direction to the neutral position is mounted so as to rotate integrally. Then, a small-diameter output gear 71 that meshes with the large-diameter transmission gear 65 and transmits the power in a decelerating manner is mounted on the clutch output shaft 59 so as to rotate integrally, and the transmission input shaft 64 is reduced on the clutch output shaft 59. They are linked. A sub-transmission lever 180 for operating the sub-transmission 51 is disposed on one side (left side) on the left and right sides of the seat 15.

The differential mechanism 52 can be freely switched between a differential state in which the left and right driving front wheels 1 are differentially driven 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 differentially driven. It is something. That is, one of the lateral transmission shafts 72 has
A shift member 74 that can be shifted in the axial direction is attached to the differential case 73 so as to rotate integrally with a non-differential position that meshes and interlocks and a differential position that disengages the meshing interlock. By shifting the shift member 74 to the differential position, the lateral transmission shaft 72 and the differential case 73 are integrated with each other, and the shift member 74 is shifted to the differential position. Is configured to allow the relative rotation of. The differential lock operating means for switching the differential mechanism 52 between the differential state and the non-differential state is provided with a spring (not shown) for biasing 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 urging force of the spring in accordance with the depressing operation of the differential lock pedal DP provided at the foot portion, that is, the shift member 74 is moved from the differential position. A means for reversibly shifting to a non-differential position. A differential case 73 of the differential mechanism 52 includes an input gear 76 that meshes with and engages with a shift output gear 75 mounted on the shift output shaft 67 so as to rotate integrally therewith, and a propeller shaft for transmission to the driving rear wheel 2. Gear 78 attached to 77
And an output gear 79 that meshes with and is attached to the gear.

The one-way clutch 53 uses the transmission input shaft 64 as a branch point from the traveling transmission system to the planting transmission system.
It is provided so that only the forward rotation of the rotation of the speed change input shaft 64 is transmitted to the planting transmission system.

The planting speed change mechanism 54 is mounted on the speed change output shaft 67 so as to be freely rotatable only relative thereto, and is interlocked with an output gear 80 of the one-way clutch 53 via a gear 81. A plurality of drive gears 83 having different diameters are mounted on the shaft 82 so as to rotate integrally with each other, and each of the drive gears 83 is attached to a planting speed change output shaft 86 that is interlocked with the planting clutch 55 via bevel gears 84 and 85. , A driven gear 87 which is always meshed and interlocked is rotatably mounted, and is engaged with an engagement recess 88 formed in each of the driven gears 87, thereby reversibly interlocking the driven gear 87 with the planted transmission output shaft 86. A ball 89 is provided so as to rotate integrally with the planted transmission output shaft 86, and an operation shaft 90 for selectively engaging the ball 89 with the engagement recess 88 is provided. That is, by selectively interlocking the driven gear 87 with the planted shift output shaft 86, the driven gear 87 used for transmission is changed to change the speed.

The front axle case 8 has the horizontal transmission shaft 7
2 and a transmission shaft for transmitting power from the transmission to the front axle. The rear axle case 10 transmits power transmitted from the transmission case 9 via the propeller shaft 77 to the drive rear wheel 2. A transmission mechanism is installed.

As shown in FIGS. 7, 8 and 9, the rear axle case 10 has a distribution transmission shaft 92 for distributing power to the left and right in association with the propeller shaft 77 via bevel gears 90 and 91. Lateral transmission case 93
A gear train 94 connected to the left and right ends of the lateral transmission case portion 93 to support the driving rear wheel 2 at the lower end thereof and transmit the power of the distribution transmission shaft 92 to the axle 2A of the driving rear wheel 2. And a pair of left and right vertical transmission case parts 95 in which

A transmission system to the driving rear wheel 2, specifically,
Between each end of the distribution transmission shaft 92 and each of the gear trains 94, a multi-plate type steering clutch 96 for intermittently transmitting power to each of the driving rear wheels 2 is provided. These steering clutches 96 are provided with a movable clutch housing 96A that rotates integrally with the distribution transmission shaft 92 and is movable in the axial direction, and a fixed clutch housing 96B that is interlocked with the gear train 94. A plurality of friction plates 96C, which are brought into pressure contact with each other by the axial movement to move to frictionally interlock and release the frictional interlock by the axial movement to the opposite direction, are separately mounted on the movable clutch housing 96A and the fixed clutch housing 96B, Movable clutch housing 9
6A is provided with a clutch spring 96D for urging the 6A to move in a specific direction. In other words, 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. Then, the movable clutch housing 96A is moved in the axial direction in the opposite direction against the urging force to release the frictional interlock, whereby the interlock of the fixed clutch housing 96B with the movable clutch housing 96A is cut off, and the clutch disengaged state appears. It is configured as follows.

The transmission front wheel 1 and the rear drive wheel 2, that is, the transmission system portion from the main clutch 50 to the steering clutch 96 in the transmission system to the traveling section, specifically, the right vertical Transmission case part 95 and movable clutch housing 9
As shown in FIG. 8, the movable clutch housing 96 </ b> A is interlocked with the vertical transmission case portion 95 by being pressed by the operation bowl 98 in accordance with the movement of the operation bowl 98 in a specific direction. Movable clutch housing 96
A, that is, a traveling brake 99 for braking the distribution transmission shaft 92 is interposed. That is, the traveling brake 99
Is provided so as to act on the portion of the distribution transmission shaft 92 that is biased to the right.

A brake operation shaft 100 reversibly presses and moves the operation bowl 98 from the brake release position to the brake operation position via the fork 101 by rotating in a specific direction around the first longitudinal axis P1. And 102
Is displaced so as to reversibly press the movable clutch housing 96A from the clutch disengaged position to the clutch engaged position via the thrust collar 103 by moving in the axial direction in the opposite direction, so that the movable clutch housing 96A can slide and rotate on the transmission shaft 92. Clutch sleeve fitted to
Reference numeral 4 denotes a clutch operation shaft that reversibly presses and moves the clutch sleeve 102 from the clutch engaged position to the clutch disengaged position via the cam 105 by rotating around the second longitudinal axis P2 in a specific direction.

As shown in FIG. 7, the brake operation shaft 100 is moved from the brake release phase to the brake operation phase in accordance with the depressing operation of the brake pedal BP disposed on the right side of the foot of the riding operation unit 13. A rod 11 having a front-rear posture is applied to the brake pedal BP so as to rotate.
It is interlocked and connected via 0.

On the other hand, as an operating mechanism of the steering clutch 96, a steering clutch operation for reversibly disengaging the steering clutch 96 on the inside of the turn with the steering operation at a set angle or more from the straight running state of the driving front wheel 1 is performed. A mechanism Z is provided.

As shown in FIGS. 7 to 11, the steering clutch operating mechanism Z is slidably driven right and left by the torque generator 43 so that the knuckles of the drive front wheels 1 are steered. The pitman arm 111 is pushed and pulled through the push / pull rod 112 so as to swing around the vertical axis Y with the steering operation (left / right swing) of the pitman arm 111 interlockingly connected to the arm 118 via the left and right drag links 119. A relay link 113 is provided, which is interlocked and connected, and swings in one direction around the vertical axis Y with the swing of the relay link 113 in one direction accompanying the steering of the pitman arm 111 to the left. The left clutch operation shaft 104 is pulled and rotated from the clutch engagement phase to the clutch release phase via the rod 127, and the pitman shaft is rotated. As the relay link 113 swings in the opposite direction with the rightward steering of the arm 111, the right clutch operation shaft 104 swings in the opposite direction around the vertical axis Y through the rod 127. A distribution link 114 interlocked with the relay link 113 is provided so as to rotate from the clutch engagement phase to the clutch release phase,
The pitman arm 111 has a pin pivot connection hole 115 with a push-pull rod 112,
Only when the rocker 1 swings from the straight running posture to the set angle or more, the swing of the pitman arm 111 is transmitted to the push-pull rod 112, but is formed in a long hole which does not transmit the swing less than the set angle.

As shown in FIGS. 12 and 13, the distribution link 114 is axially oriented with respect to an interlocking lever 126 which swings integrally with the relay link 113 via a shaft 125 supporting the relay link 113. The movable lever 126 can be moved far and near.
When the remote position is in the interlocked state, it is disengaged from the interlocking lever 126 to be released. In other words, the steering clutch operating mechanism Z turns the steering clutch 9 on the inner side of the turn with the steering operation beyond the set angle of the drive front wheel 1 by the distributing link 113 being in the linked state.
6 is switched to an operating state in which the steering wheel 96 is switched off, and the distributing link 113 is switched to a non-operating state in which the steering clutch 96 is not switched off even if the drive front wheel 1 is steered to a set angle or more. It is.

In the operation device of the rice transplanter, switching operation means for switching the steering clutch operation mechanism Z between the active state and the inactive state, that is, the distribution link 114
As shown in FIG. 7, FIG. 10, FIG. 12, and FIG. 13, the operation means for changing the operation of the position to the approach interlocking position a1 and the separation release position a2 is performed by vertical swinging around the first horizontal axis x1. A state switching operation lever 117 for changing between the interlocking position A1 and the release position A2 is disposed below the seat 15, and a spring 120 for urging the distribution link 114 to move to the approaching interlocking position a1 is provided. A cam 121 for reversibly pressing and moving the distribution link 114 from the approach interlocking position a1 to the separation release position a2 against the urging force by swinging in one direction around x2 is provided, and the state switching operation lever 117 is released. The cam 121 when operated to A2
Is in the release position to position the distribution link 114 at the separation release position a2, and when the state switching operation lever 117 is operated to the interlocking position A1, the cam 121 is moved.
Is provided with a push / pull rod 122 for interlockingly connecting the state switching operation lever 117 and the cam 121 so as to swing to the interlocking posture that positions the distribution link 114 at the approach interlocking position a1.

The cam 121 is connected to the distribution link 114
By arranging the horizontal second axis x2 on a straight line along the pressing direction including the pressing point with respect to the
Is configured to be able to hold itself in the release posture in a state where it is pressed.

Therefore, in this rice transplanter, the boarding operation unit 13
The brake pedal BP, the main clutch pedal CP, and the differential lock pedal DP become the pedals installed at the feet of the vehicle, and the feet are simple and the pedal operability and walking workability can be improved.

[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 closer to the right side of the foot of the riding driving unit 13 so that they can be individually depressed and operated simultaneously with one foot F. It is arranged.

[Third Embodiment] The third 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 side of the foot portion of the boarding operation unit 13 so that they can be individually depressed and operated simultaneously with one foot F. It is arranged.

[Fourth Embodiment] The fourth embodiment is modified as follows in the first embodiment. That is, as shown in FIG. 16, a means for reversibly switching the steering clutch operating mechanism Z to a non-operating state by depressing the pedal AP is provided as the switching operating means of the steering clutch operating mechanism Z. The pedal AP and the brake pedal BP are arranged close to each other so that they can be individually depressed and operated simultaneously with one foot F.

[Fifth Embodiment] The fifth embodiment is modified as follows. That is, as shown in FIG. 17, a means for reversibly switching the steering clutch operating mechanism Z to a non-operating state by depressing the pedal AP is provided as a switching operating means of the steering clutch operating mechanism Z. The pedal AP and the clutch pedal CP are arranged close to each other so that they can be individually depressed and operated simultaneously with one foot F.

[Sixth Embodiment] The sixth embodiment is modified as follows. That is, as shown in FIG. 18, a means for reversibly switching the steering clutch operating mechanism Z to a non-operating state by depressing the pedal AP is provided as a switching operating means of the steering clutch operating mechanism Z. The brake pedal BP and the main clutch pedal CP can be individually depressed and operated simultaneously with one foot F on the right side of the foot of the boarding operation unit 13 with the pedal AP disposed at the foot of the driver. It is arranged close to.

[Seventh Embodiment] The seventh embodiment is modified as follows. That is, as shown in FIG. 19, 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-operation state by depressing the pedal AP is provided. The brake pedal BP and the main clutch pedal CP can be individually depressed and operated simultaneously with one foot F on the left side of the foot portion of the boarding operation unit 13. It is arranged close to.

[Eighth Embodiment] The eighth embodiment is modified as follows. That is, as shown in FIG. 20, a means for reversibly switching the steering clutch operating mechanism Z to a non-operating state by depressing the brake pedal BP is provided as a switching operating means of the steering clutch operating mechanism Z.

[Ninth Embodiment] The ninth embodiment is modified as follows in the first embodiment. That is, as shown in FIG. 21, as the switching operation means of the steering clutch operation mechanism Z, a means for reversibly switching the steering clutch operation mechanism Z to the non-operation state by depressing the brake pedal BP is provided. The brake pedal BP and the main clutch pedal CP are arranged close to each other at the right side of the foot portion of the thirteen so that the brake pedal BP and the main clutch pedal CP can be individually depressed and operated simultaneously with one foot F.

[Tenth Embodiment] The tenth embodiment is modified as follows. That is, FIG.
As means for switching the steering clutch operating mechanism Z, means for reversibly switching the steering clutch operating mechanism Z to a non-operating state by depressing the brake pedal BP is provided as shown in FIG. The brake pedal BP and the main clutch pedal CP are arranged close to each other so that they can be individually depressed and operated simultaneously with one foot F.

[Eleventh Embodiment] The eleventh embodiment is modified as follows. That is, a means for reversibly switching the steering clutch operating mechanism Z to the non-operating state by the depressing operation of the main clutch dull CP is provided as the switching operating means of the steering clutch operating mechanism Z.

[Twelfth Embodiment] The twelfth embodiment is modified as follows. That is, a means for reversibly switching the steering clutch operating mechanism Z to the non-operating state by the depressing operation of the main clutch dull CP is provided as the switching operating means of the steering clutch operating mechanism Z.

[Thirteenth Embodiment] The thirteenth embodiment is modified as follows. In other words, as the switching operation means of the steering clutch operating mechanism Z, the steering clutch operating mechanism Z is operated by depressing the main clutch dull CP.
For reversibly switching to a non-operating state.

[Fourteenth Embodiment] Each of the first to thirteenth embodiments is modified as follows. That is, as shown in FIG.
Is provided so as to brake the propeller shaft 77. The traveling brake 99 is an inward expanding drum brake, and includes a brake pedal BP and a traveling brake 99.
The interlocking connection means for interlocking connection with the bell crank 200
And the bell crank 200 is connected to the brake pedal BP
And a rod 202 for interlocking the bell crank 200 with the operating arm 99a of the travel brake 99.

[Fifteenth Embodiment] Each of the first to thirteenth embodiments is modified as follows. That is, the traveling brake 99 is provided so as 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 exert a braking action on a portion of the distribution transmission shaft 92 that is biased to the left.

[Alternative Embodiment] In the above embodiment, the steering clutch operating mechanism Z is switched by operating force from the state switching operating lever 117 or the pedal AP.
The steering clutch operating mechanism Z may be switched by a hydraulic or electric actuator that operates in response to the operation of the state switching operation lever 117 or the pedal AP.

[Brief description of the drawings]

FIG. 1 is a side view

FIG. 2 is a plan view

FIG. 3 is a side view of a main part.

FIG. 4 is a plan view of a main part.

FIG. 5 is a sectional view of the transmission mechanism in the transmission case.

FIG. 6 is a sectional view of a transmission mechanism in a transmission case.

FIG. 7 is an operation system diagram

FIG. 8 is a longitudinal rear view of a main part (right side) of a rear axle case.

FIG. 9 is a longitudinal rear view of a main part (left side) of a rear axle case.

FIG. 10 is a side view of a main part.

FIG. 11 is a plan view of a main part of a steering clutch operating mechanism.

FIG. 12 is a front view of a main part of a steering clutch operating mechanism.

FIG. 13 is a side view of a 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 a pedal arrangement according to the third embodiment.

FIG. 16 is a schematic plan view showing a pedal arrangement according to a fourth embodiment.

FIG. 17 is a schematic plan view showing a pedal arrangement according to a fifth embodiment.

FIG. 18 is a schematic plan view showing a pedal arrangement according to a sixth embodiment.

FIG. 19 is a schematic plan view showing a pedal arrangement according to the seventh embodiment.

FIG. 20 is a schematic plan view showing the pedal arrangement according to the eighth embodiment.

FIG. 21 is a schematic plan view showing a pedal arrangement according to a ninth embodiment.

FIG. 22 is a schematic plan view showing a pedal arrangement according to the tenth embodiment.

FIG. 23 is a traveling brake operation system diagram of a fourteenth embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 drive front wheel 2 drive rear wheel 4 paddy field working device 50 main clutch 52 differential mechanism 77 propeller shaft 92 distribution transmission shaft 96 steering clutch 99 running brake 117 lever CP main clutch pedal BP brake pedal AP pedal Z steering clutch operation mechanism

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)

Claims (11)

[Claims] The right and left steering clutches, each of which selectively transmits transmission to each of the left and right driving rear wheels in accordance with the steering operation at a set angle or more from the straight traveling state of the steering front driving wheel, are included in the left and right steering clutches. A steering clutch operating mechanism for reversibly turning off and on the object, a main clutch pedal for turning on and off the main clutch for turning on and off the transmission to the traveling section and the paddy field working device, and a brake pedal for braking the running brake An operation device of a paddy working machine provided with
An operating device for a paddy working machine, wherein the steering clutch operating mechanism is configured to be freely operable to switch between an operating state in which the steering clutch is operated and a non-operating state in which the steering clutch is not operated. 2. The operating device for a paddy working machine according to claim 1, wherein means for switching the steering clutch operating mechanism by operating a lever is provided as the switching operating means of the steering clutch operating mechanism. 3. An operation of a paddy field working machine according to claim 1, wherein said switching operation means of said steering clutch operation mechanism is provided with means for reversibly switching said steering clutch operation mechanism to a non-operation state by depressing a pedal. apparatus. 4. The operating device for a paddy working machine according to claim 3, wherein the pedal and the brake pedal are arranged close to each other so as to be able to be individually depressed and operated simultaneously with one foot. 5. The operating device for a paddy working machine according to claim 3, wherein the pedal and the main clutch pedal are arranged close to each other so as to be able to be individually depressed and operated simultaneously with one foot. 6. The paddy field working machine according to claim 1, wherein the switching operation means of the steering clutch operating mechanism is provided with means for reversibly switching the steering clutch operating mechanism to a non-operating state by depressing the brake pedal. Operating device. 7. The paddy field working machine according to claim 1, wherein the switching operation means of the steering clutch operation mechanism is provided with means for reversibly switching the steering clutch operation mechanism to a non-operation state by depressing a main clutch pedal. Operating device. 8. The paddy field according to claim 1, wherein the main clutch pedal and the brake pedal are arranged close to each other so that they can be individually depressed and operated simultaneously with one foot. Operating device of work machine. 9. A driving system in which the power from the propeller shaft of the transmission system to the left and right driving rear wheels is distributed to the left and right steering clutches so as to perform a braking action on a portion biased to the left or right side of the distribution transmission shaft. The operating device for a paddy working machine according to any one of claims 1 to 8, further comprising a brake. 10. The operation of a paddy working machine according to claim 1, wherein a traveling brake is provided so as to brake the propeller shaft in the transmission system to the left and right driving rear wheels. apparatus. 11. The driving mechanism according to claim 1, wherein the front left and right driving wheels are two, and a differential lock operating means for switching a differential mechanism for the front driving wheels between a differential state and a non-differential state is provided. Operating equipment of paddy field working machine.