JP2022015944A - Paddy field working machine - Google Patents

Abstract

To reduce such a situation as to roughen a field surface by a rear wheel in a turning center side when turning, in a four-wheel-drive paddy field working machine.SOLUTION: A paddy field working machine includes a right side clutch 51 capable of transmitting/cutting off power with respect to a right rear wheel 2, and a left side clutch 52 capable of transmitting/cutting off the power with respect to a left rear wheel 2. When front wheels 1 are steered to the right beyond a right setup angle R1, while the left side clutch 52 is operated in a transmission state, the right side clutch 51 is repetitively alternately operated into the transmission state and the cutoff state. When the front wheels 1 are steered to the left beyond a left setup angle L1, while the right side clutch 51 is operated in a transmission state, the left side clutch 52 is repetitively alternately operated into the transmission state and the cutoff state.SELECTED DRAWING: Figure 6

Description

The present invention relates to a configuration of a traveling system of a four-wheel drive type paddy field working machine such as a riding type rice transplanter and a riding type direct seeding machine.

As disclosed in Patent Document 1, the four-wheel drive type passenger-type rice transplanter, which is an example of a paddy field work machine, does not have a differential mechanism for the right and left rear wheels, and the rear right is not provided. Some wheels are provided with a right side clutch capable of transmitting and disconnecting power, and a left rear wheel provided with a left side clutch capable of transmitting and disconnecting power.

In Patent Document 1, when the front wheel 1 is steered near the straight-ahead position, the right and left side clutches are operated in the transmission state, and the right and left front wheels and the right and left rear wheels are operated. It is in a state of being rotationally driven.

For example, when the front wheel is largely steered to the right to make a right turn, the right side clutch is operated in a disengaged state, and the right and left front wheels and the left rear wheel are rotationally driven. A right turn is made.
In this case, when the right side clutch is operated in the disengaged state, the right rear wheel is in the free rotation state, and the right rear wheel turns to the right while rotating little by little with the right turn. By setting the rear wheel on the turning center side to the free rotation state in this way, it is possible to reduce the state in which the rice field surface is roughened by the rear wheel on the turning center side.

Japanese Unexamined Patent Publication No. 2014-161318

For example, in a deep paddy field, when the mud of the paddy field contains a large amount of clay, or in the case of a large paddy field working machine with a heavy body weight, the resistance applied to the rear wheels becomes large.
Even if turning is performed in a state where a large resistance is applied to the rear wheels and the side clutch on the turning center side is operated in a cutoff state, the rear wheels on the turning center side rotate little by little due to the large resistance applied to the rear wheels. There may be a situation in which the rear wheel on the center side of the turn remains stopped at that position and turns in the turning direction.

As mentioned above, if the rear wheel on the center of turning remains at that position and turns in the turning direction, the rear wheel on the center of turning may roughen the field surface, which is an improvement. There is room.

An object of the present invention is to reduce a state in which a rear wheel on the center side of a turn causes the paddy surface to be roughened when turning in a four-wheel drive type paddy field work machine.

The paddy field working machine of the present invention includes right and left front wheels that are steerable and rotationally driven, right and left rear wheels, and a right side clutch that can transmit and disconnect power to the right rear wheel. , The right and left based on the detection of the left side clutch capable of transmitting and disconnecting power to the left rear wheel, the steering angle detecting unit for detecting the direction of the front wheel, and the steering angle detecting unit. The side clutch operating unit is provided with a side clutch operating unit capable of operating the side clutch in the transmission state and the disengagement state. And when the left side clutch is operated in the transmission state and the front wheel is steered to the right beyond the right set angle, the right side clutch is operated while operating the left side clutch in the transmission state. Is repeatedly operated alternately in the transmission state and the cutoff state, and when the front wheel is steered to the left beyond the set angle on the left, the left side clutch is operated in the transmission state while operating the left. The side clutch is operated alternately and repeatedly in the transmission state and the cutoff state.

According to the present invention, when the front wheels are steered within the range of the right and left set angles from the straight-ahead position, the right and left side clutches are operated in the transmission state, and the right and left front wheels, the right and the right and left are operated. The four left rear wheels are rotationally driven.

According to the present invention, when the front wheel is steered to the right (left) beyond the set angle of the right (left), the right and left front wheels and the rear wheel on the outer side of the turn are rotationally driven and the turning center. The side clutch on the side is operated alternately and repeatedly in the transmission state and the cutoff state.
As a result, even if the rear wheel on the turning center side is stopped when the side clutch on the turning center side is operated in the disengaged state, the turning is performed when the side clutch on the turning center side is operated in the transmission state next time. The rear wheel on the center side is rotationally driven.

According to the present invention, even when a large resistance is applied to the rear wheels, the rear wheels on the turning center side are configured to repeat rotation and stopping, so that the rear wheels on the turning center side stop at that position. It is possible to suppress the state of turning in the turning direction until the turning direction, and to obtain a state in which the rear wheel on the turning center side turns little by little as the turning turns, and the rear wheel on the turning center side roughens the field surface. It is possible to reduce the number of conditions.

As a configuration different from the present invention, in the right and left side clutches of the friction multi-plate type, the side clutch on the turning center side is operated in a semi-transmission state, and the side clutch on the turning center side is slid while the turning center side. A configuration is conceivable in which power is transmitted to the rear wheels little by little.
In this configuration, when a particularly large resistance is applied to the rear wheels, the side clutch on the turning center side completely slips, and the rear wheels on the turning center side are not driven to rotate. If the side clutch on the turning center side is kept slid for a long time, heat generation and wear of the side clutch may occur, which may lead to a decrease in the durability of the side clutch.

According to the present invention, the side clutch on the turning center side is repeatedly operated alternately in the transmission state and the cutoff state, and the semi-transmission state of the side clutch on the turning center side is unlikely to occur, which causes the above-mentioned problems. Is few.

In the present invention, the side clutch operation unit transmits the operation of the drive unit and the drive unit to the right and left side clutches, and operates the right and left side clutches in a transmission state and a cutoff state. It is preferable to have a mechanism.

According to the present invention, by controlling the drive unit in the side clutch operation unit, it is possible to easily operate the side clutch on the turning center side alternately and repeatedly in the transmission state and the cutoff state.
Further, in the transmission time in which the side clutch on the turning center side is operated in the transmission state and the cutoff time in which the side clutch on the turning center side is operated in the cutoff state, the transmission time and the cutoff time are set to the same length. Controls such as setting and lengthening or shortening the transmission time with respect to the cutoff time can be easily performed by controlling the drive unit.

According to the present invention, in the side clutch operation unit, the operation of the drive unit is transmitted to the right and left side clutches via the linkage mechanism, so that the drive unit is relatively high away from the field surface. Since it is easy to arrange it at a position, it is possible to suppress the adhesion of mud and water to the drive unit, which is advantageous in terms of improving the durability of the drive unit.

In the present invention, a rear axle case is provided that supports the right and left rear wheels and accommodates the right and left side clutches, and the linking mechanism is a side view of the front wheel axle and the rear wheel axle. A relay member arranged between the two, a first linking member connected to the drive unit and the relay member, and a second connected member connected to the relay member and the right and left side clutches. It is preferable to have a two-linking member.

In paddy field work machines, a rear axle case that supports the right and left rear wheels may be provided, and the rear axle case is supported by the airframe frame so that it can be rolled, or is supported by the airframe frame via a suspension mechanism. Sometimes.

According to the present invention, when the right and left side clutches are housed in the rear axle case, the relay member of the linkage mechanism is arranged in front of the rear axle case in the linkage mechanism of the side clutch operation unit, and the second linkage mechanism is provided. The linking member extends rearward from the relay member and is connected to the right and left side clutches of the rear axle case.
As a result, even if the rear axle case rolls or moves up and down by the suspension mechanism, the second linkage member of the linkage mechanism swings around the relay member as a fulcrum, so that the rear axle case rolls and moves up and down. The movement is absorbed reasonably.

According to the present invention, the first linking member of the linking mechanism is connected over the drive unit and the relay member of the linking mechanism, so that the first linking member of the linking mechanism separates the drive section upward from the field surface. It can be easily placed at a relatively high position.

In the present invention, the front wheel axle and the rear wheel axle of the fuselage frame are supported so as to swing up and down around the axis along the left-right direction in a side view, and are supported rearward from the axis. An extended right and left suspension link is provided, the rear axle case is supported by the rear portion of the suspension link, and is supported by the fuselage frame via a suspension spring, and the relay member is viewed in plan. It is preferable that the suspension links are arranged between the right and left suspension links.

In paddy field work machines, when the rear axle case is configured to be supported by the fuselage frame via a suspension mechanism, the right and left parts of the fuselage frame between the front wheel axle and the rear wheel axle. The suspension link may be configured to be swingably supported and extended rearward, with the rear axle case supported at the rear of the suspension link and supported by the fuselage frame via suspension springs. (For example, 5-link model, 3-link model, etc.).

According to the present invention, in the above-mentioned state, the relay member of the linkage mechanism is arranged between the right and left suspension links in a plan view, so that the space between the right and left suspension links can be effectively used. , The relay member of the linkage mechanism can be arranged compactly.

In the present invention, it is preferable that the second linking member is arranged along the right and left suspension links in a side view.

According to the present invention, as described above, in a state where the relay member of the linkage mechanism is arranged between the right and left suspension links in a plan view, the second linkage member of the linkage mechanism is right and left in the side view. By arranging along the suspension link, the second linking member of the linking mechanism can be compactly arranged.

In the present invention, it is preferable that the drive unit is arranged at a position rearward from the relay member and at a position higher than the rear axle case.

In paddy field work machines, the driver's seat is placed above the rear axle case, and a floor on which the driver stands or sits on the driver's seat while placing his foot may be provided in front of the driver's seat. Space may be created between the seat and the seat.

According to the present invention, when a space is created above the rear axle case, the drive unit can be arranged in this space. Therefore, the space created above the rear axle case can be effectively used to make the drive unit compact. Can be placed in.

In the present invention, the drive unit has an actuator and a reciprocating member driven reciprocating by the actuator, and the reciprocating member is reciprocated by the actuator over a neutral position and a one-sided operation position. Then, the reciprocating member is reciprocally driven over the neutral position and the other side operating position by the actuator, and the reciprocating member is connected to the right side clutch with the right linking mechanism. The left linking mechanism connected to the reciprocating member and the left side clutch is provided, and the right linking mechanism is said to be operated when the reciprocating member is operated to the neutral position. When the right side clutch is operated in the transmission state and the reciprocating member is operated in the one-side operation position, the right side clutch is operated in the disengaged state, and the reciprocating member is operated in the other-side operation. Even if the reciprocating member is operated to the position, the movement of the reciprocating member to the other side operating position is not transmitted to the right side clutch, and the right side clutch is maintained in the transmitted state. When the reciprocating member is operated to the neutral position, the left linking mechanism operates the left side clutch in a transmission state, and the reciprocating member is moved to the other side operating position. When operated, even if the left side clutch is operated in the disengaged state and the reciprocating member is operated to the one-sided operating position, the operation of the reciprocating member to the one-sided operating position is described. It is preferable to have a left accommodation portion that is not transmitted to the left side clutch and allows the left side clutch to be maintained in the transmitted state.

According to the present invention, when the reciprocating member is operated in the neutral position by the actuator in the drive unit, the right and left side clutches are operated in the transmission state.
In the drive unit, when the reciprocating member is reciprocated over the neutral position and the one-side operation position by the actuator, the operation of the reciprocating member is transmitted to the right side clutch via the right coupling mechanism. , The right side clutch is operated in the transmission state and the cutoff state. In this case, the movement of the reciprocating member to one side operation position is not transmitted to the left side clutch by the flexible portion of the left coupling mechanism, and the left side clutch is maintained in the transmission state.

In the drive unit, when the reciprocating member is reciprocated over the neutral position and the other side operating position by the actuator, the operation of the reciprocating member is transmitted to the left side clutch via the left linkage mechanism. , The left side clutch is operated in the transmission state and the cutoff state. In this case, the movement of the reciprocating member to the other side operating position is not transmitted to the right side clutch by the flexible portion of the right coupling mechanism, and the right side clutch is maintained in the transmitted state.

According to the present invention, the simple operation of reciprocating the reciprocating member between the neutral position and the one-side operation position by the actuator, and the reciprocating drive of the reciprocating member over the neutral position and the other side operation position. By a simple operation of doing, it is possible to obtain a state in which the right side clutch is operated in the transmission state and the disengagement state, and a state in which the left side clutch is operated in the transmission state and the disengagement state. It is advantageous in terms of simplification of the side clutch operation unit.

It is a left side view of a passenger-type rice transplanter. It is a top view of a passenger-type rice transplanter. It is a left side view near the fuselage frame. It is a top view near the fuselage frame. It is an exploded perspective view of the side clutch operation part. It is a schematic plan view which shows the transmission system to the front wheel and the rear wheel, and the side clutch operation part. It is a schematic plan view which shows the operating state of the side clutch operation part. It is a left side view near the link mechanism in the state where the seedling planting device is lowered. It is an exploded perspective view near the link mechanism. It is a left side view near the link mechanism in the state where the seedling planting device is raised.

1 to 10 show a 10-row planting type passenger-type rice transplanter, which is an example of a paddy field working machine. In FIGS. 1 to 10, F indicates a forward direction, B indicates a backward direction, U indicates an upward direction, D indicates a downward direction, R indicates a right direction, and L indicates a left direction. ..

(Overall configuration of passenger rice transplanter)
As shown in FIGS. 1 and 2, the passenger-type rice transplanter raises and lowers the link mechanism 3 and the link mechanism 3 on the rear part of the machine frame 30 provided with the right and left front wheels 1 and the right and left rear wheels 2. A hydraulic cylinder 4 is provided, and a seedling planting device 5 is supported at the rear of the link mechanism 3, and the seedling planting device 5 is supported at the rear of the machine frame 30 so as to be able to move up and down. In addition to the seedling planting device 5, the passenger-type rice transplanter is equipped with a ground leveling device 11, a fertilizer application device 12, and a chemical spraying device 28.

(Structure of seedling planting device)
As shown in FIGS. 1 and 2, five planting transmission cases 6 arranged at predetermined intervals in the left-right direction on the seedling planting device 5 and rotating to the right and left parts of the planting transmission case 6. A rotating case 7 that can be supported, a planting arm 8 that is supported at both ends of the rotating case 7, five floats 9, a seedling stand 10, and the like are provided.

In the seedling planting device 5, the rotary case 7 is rotationally driven while the seedling stand 10 is laterally fed, and the planting arm 8 takes out the seedlings from the lower part of the seedling stand 10 and plants them on the rice field surface.

(Structure of ground leveling device)
As shown in FIGS. 1 and 8, a ground leveling device 11 for leveling the rice field surface is supported at the lower part of the front part of the seedling planting device 5, and the ground leveling device 11 is provided around the axis P1 along the left-right direction. A drive shaft 11a rotatably supported and a large number of leveling bodies 11b attached to the drive shaft 11a are provided. By rotationally driving the drive shaft 11a of the ground leveling device 11 in the counterclockwise direction of FIG. 8, the ground leveling body 11b of the ground leveling device 11 performs leveling of the field surface.

(Structure of fertilizer application device and chemical spraying device)
As shown in FIGS. 1 and 2, a fertilizer application device 12 is supported over the rear portion of the machine frame 30 and the seedling planting device 5, and the fertilizer application device 12 includes a hopper 13, a feeding portion 14, a blower 15, and a crop. A groover 16 and a hose 17 are provided.

In the fertilizer application device 12, a hopper 13 for storing fertilizer and a feeding portion 14 are provided on the upper portion of the rear portion of the machine frame 30, and a blower 15 is provided on the left lateral side of the feeding portion 14. A grooving device 16 is attached to the float 9, and a hose 17 is connected to the feeding portion 14 and the grooving device 16.

In the fertilizer application device 12, the fertilizer of the hopper 13 is fed out by the feeding portion 14, and is supplied to the groove making device 16 through the hose 17 by the transport air of the blower 15, and a groove is formed on the field surface by the groove making device 16. While doing so, fertilizer is supplied from the groove making device 16 to the groove on the rice field.

The drug spraying device 28 is supported by a support frame 29 connected to the central planting transmission case 6. From the chemical spraying device 28, a chemical such as a herbicide is sprayed on the rice field surface behind the seedling planting device 5.

(Transmission system to front and rear wheels)
As shown in FIGS. 1, 3 and 4, the square pipe-shaped right and left airframe frames 30 are arranged along the front-rear direction, and the mission case 18 is connected to the front portion of the airframe frame 30. .. A support frame 19 is connected to the front portion of the mission case 18, and the engine 20 is supported by the support frame 19.

As shown in FIG. 6, the front wheel support case 21 is connected to the right and left portions of the mission case 18, and the right and left front wheels 1 are steerably supported by the front wheel support case 21. The rear axle case 22 is supported by the rear portion of the fuselage frame 30, and the right and left rear wheels 2 are supported by the rear axle case 22.

A hydrostatic type continuously variable transmission 23 is connected to the lateral side of the mission case 18, and the power of the engine 20 is transmitted to the continuously variable transmission 23 via the transmission belt 24. The power of the continuously variable transmission 23 is transmitted to the auxiliary transmission (not shown) inside the transmission case 18, and the transmission shaft (not shown) inside the front wheel differential device (not shown) and the front wheel support case 21 (not shown). Is transmitted to the right and left front wheels 1 via.

As shown in FIGS. 3, 4, and 6, the output shaft 25 is rearwardly supported at the rear of the mission case 18. The power branched from the auxiliary transmission is transmitted from the output shaft 25 to the input shaft 31 of the rear axle case 22 via the universal joint 26 and the transmission shaft 27, and is described later (transmission system of the rear axle case). Is transmitted to the right and left rear wheels 2.

(Composition of steering operation of front wheels)
As shown in FIGS. 1 and 2, the control handle 32 is provided on the front portion of the fuselage frame 30, the shift lever 37 is provided on the left lateral portion of the control handle 32, and the shift lever 37 provides a continuously variable transmission device 23. Is steplessly operated to the neutral stop position, forward side and reverse side.

Vertical wall-shaped right and left support members 38 are provided at the rear of the right and left machine frames 30, and the driver's seat 33, the hopper 13 of the fertilizer application device 12, and the feeding portion 14 (the above-mentioned (fertilizer application device and drug). (See Configuration of Spreading Device)) and is supported on top of the support member 38. A floor 34 on which the driver stands or sits on the driver's seat 33 and puts his / her foot on it is provided at a low position between the steering wheel 32 and the driver's seat 33.

As shown in FIG. 6, the steering member 35 operated by the steering handle 32 is supported at the lower part of the mission case 18 so as to be swingable around the axis P2 along the vertical direction, and the steering member 35 is supported. The tie rod 36 is connected to the right and left front wheels 1. By operating the steering wheel 32, the steering member 35 is steered from the straight position N over the right steering limit R2 and the left steering limit L2, and the steering handle 32 controls the front wheel 1. Steering operation is performed.

(Support configuration of rear axle case)
As shown in FIGS. 3 and 4, the suspension link 41 on the right and left, the suspension link 42 on the lower right and left, and the lateral link 43 are provided.

From the side view, in the right and left fuselage frames 30, the right and left brackets 39 are located between the axle 1a of the front wheels 1 (see FIG. 6) and the axles 2a of the rear wheels 2 (see FIG. 6). It is connected. The suspension links 41 on the right and left are supported by the bracket 39 so as to be vertically swingable around the shaft core P3 along the left-right direction, and extend rearward from the shaft core P3.

When viewed from the side, the bracket 40 is connected to the right and left fuselage frames 30 between the axle 1a of the front wheel 1 (see FIG. 6) and the axle 2a of the rear wheel 2 (see FIG. 6). , The bracket 40 is arranged in front of the bracket 39. The bracket 40 is also connected to the mission case 18, and the right and left frames 65 are connected to the right and left parts of the bracket 40 and the rear part of the right and left airframe frames 30. The lower right and left suspension links 42 are supported by the bracket 40 so as to be vertically swingable around the shaft core P4 along the left-right direction, and extend rearward from the shaft core P4.

The right and left support brackets 44 are connected to the right and left portions of the front portion of the rear axle case 22. The rear of the suspension link 41 on the right and left is swingably supported on top of the right and left support brackets 44. The rear part of the suspension link 42 under the right and left is swingably supported by the lower part of the right and left support brackets 44.

The lateral link 43 is located behind the rear axle case 22, and the lateral link 43 is swingably connected across the rear of the left fuselage frame 30 and the right portion of the rear rear axle case 22. There is.

The right and left support brackets 45 are connected to the right and left portions of the front portion of the rear axle case 22, and the spring receiving portions 46 are connected to the rear portions of the right and left fuselage frames 30. The right and left suspension springs 47 are attached over the support bracket 45 and the spring receiving portion 46, and the rear axle case 22 is supported by the fuselage frame 30 via the suspension spring 47.

As described above, the suspension link 41 on the right and left, the suspension link 42 on the lower right and left, the lateral link 43, and the suspension spring 47 on the right and left constitute a 5-link type suspension mechanism.

(Transmission system of rear axle case)
As shown in FIG. 6, inside the rear axle case 22, the transmission shaft 48 is supported along the left-right direction, and the bevel gear 48a connected to the transmission shaft 48 and the bevel gear 31a connected to the input shaft 31. Is occluded.

A right side clutch 51 and a left side clutch 52 are provided on the right and left portions of the transmission shaft 48. The right and left side clutches 51 and 52 are configured in a friction multi-plate type, and are urged to a transmission state by an internal spring (not shown). A gear type right deceleration mechanism 49 is provided over the right side clutch 51 and the right rear wheel 2 axle 2a, and over the left side clutch 52 and the left rear wheel 2 axle 2a. A gear type left reduction mechanism 49 is provided.

With the above configuration, the power transmitted to the input shaft 31 is transmitted to the right rear wheel 2 via the transmission shaft 48, the right side clutch 51, and the right deceleration mechanism 49, and the transmission shaft 48, It is transmitted to the left rear wheel 2 via the left side clutch 52 and the left reduction mechanism 49.

(Overview of the operation system of the right and left side clutches)
As shown in FIGS. 5, 6 and 7, a side clutch operating unit 50 for operating the right and left side clutches 51 and 52 in the transmission state and the disengagement state is provided. The side clutch operating unit 50 has a driving unit 54, a right linking mechanism 55, and a left linking mechanism 56.

The right linking mechanism 55 transmits the operation of the drive unit 54 to the right side clutch 51, and operates the right side clutch 51 in the transmission state and the cutoff state with the drive unit 54 and the right side clutch 51. It is connected over.

The left linking mechanism 56 transmits the operation of the drive unit 54 to the left side clutch 52, and operates the left side clutch 51 in the transmission state and the disengaged state with the drive unit 54 and the left side clutch 52. It is connected over.

(Structure of drive unit in side clutch operation unit)
As shown in FIGS. 3 and 4, a support frame 53 is connected to the rear portion of the left airframe frame 30, and a drive unit 54 is supported by the support frame 53.

As shown in FIGS. 3 to 7, the support member 57 is connected to the support frame 53. A fan-shaped operation gear 58 (corresponding to a reciprocating member) is supported by a support member 57 so as to be able to reciprocate and swing around the axis P5 along the left-right direction, and an angle for detecting the operation angle of the operation gear 58. The sensor 59 is attached to the support member 57.

A gear mechanism 63 having a pinion gear 63a is attached to a support member 57, and the pinion gear 63a of the gear mechanism 63 meshes with the operation gear 58. An electric motor 64 (corresponding to an actuator) for driving the gear mechanism 63 is attached to the gear mechanism 63. The operation gear 58 is reciprocally driven around the shaft core P5 by the electric motor 64 via the gear mechanism 63.

As a result, the drive unit 54 is located at a position rearward from the right and left relay members 60 and 70 described in (configuration of the right and left linkage mechanism in the side clutch operation unit) described later, and the rear axle case. It is located higher than 22. The drive unit 54 is arranged in the space between the rear axle case 22 and the driver's seat 33 in a side view, and is arranged in the space between the right and left support members 38 (see FIG. 1) in a plan view.

(Structure of right and left linkage mechanism in side clutch operation part)
As shown in FIGS. 5, 6 and 7, the right linking mechanism 55 has a right relay member 60, a right first linking member 61, and a right second linking member 62. The left linking mechanism 56 has a left relay member 70, a left first linking member 71, and a left second linking member 72.

As shown in FIGS. 3, 4, and 5, right and left brackets 66 are connected to the front of the right and left frames 65, and the relay shaft 67 is supported over the right and left brackets 66. The right relay member 60 and the left relay member 70 are supported by the relay shaft 67 so as to be independently swingable around the axis P6 along the left-right direction.

As a result, the right and left relay members 60 and 70 are arranged between the axle 1a of the front wheel 1 (see FIG. 6) and the axle 2a of the rear wheel 2 (see FIG. 6) in a side view, and are arranged in a plan view. It is arranged between the right and left suspension links 41 and 42, and is arranged between the right and left airframe frames 30.

The right relay member 60 is configured by connecting an upward arm 60b and a downward arm 60c to a boss portion 60a rotatably attached to a relay shaft 67. The relay member 70 on the left is configured by connecting an upward arm 70b and a downward arm 70c to a boss portion 70a rotatably attached to the relay shaft 67.

The first linking member 61 on the right is connected to the operation gear 58 of the drive unit 54 and the arm 60b of the relay member 60 on the right. The left first linking member 71 is connected to the operation gear 58 of the drive unit 54 and the arm 70b of the left relay member 70.

As shown in FIGS. 3, 4, 5, and 7, the right operation unit 73 and the left operation unit 74 capable of operating the right and left side clutches 51 and 52 in the transmission state and the cutoff state are along the vertical direction. It is supported downward by the rear axle case 22 so as to be swingable around the axle core P7.

The front part of the right second linking member 62 is connected to the arm 60c of the right relay member 60, and the connecting part 62a is connected to the rear part of the right second linking member 62, and the long hole-shaped connecting hole 62b is connected. (Corresponding to the right flexible portion) is opened in the connecting portion 62a. The arm 73a is connected to the right operation unit 73, the pin 73b connected to the arm 73a is inserted into the connection hole 62b of the right second linkage member 62, and the right second linkage member 62 operates on the right. It is connected to the right side clutch 51 via the portion 73.

The front part of the left second linking member 72 is connected to the arm 70c of the left relay member 70, and the connecting part 72a is connected to the rear part of the left second linking member 72, and the long hole-shaped connecting hole 72b is connected. (Corresponding to the left flexible portion) is opened in the connecting portion 72a. The arm 74a is connected to the left operation unit 74, the pin 74b connected to the arm 74a is inserted into the connection hole 72b of the left second linkage member 72, and the left second linkage member 72 is operated on the left. It is connected to the left side clutch 52 via the portion 74.

As a result, as shown in FIGS. 3 and 4, the right and left first linking members 61 and 71 extend diagonally backward and upward from the right and left relay members 60 and 70 in a side view. They are arranged so as to intersect the transmission shaft 27, the right and left airframe frames 30, and the suspension links 41 on the right and left.

The right and left first linking members 61, 71 are arranged between the right and left second linking members 62, 72, and between the right and left upper suspension links 41, in plan view, right. And left between the lower suspension links 42 and between the right and left airframe frames 30.

The right and left second linking members 62, 72 are arranged along the right and left lower suspension links 42 and below the right and left lower suspension links 42 in a side view. Has been done. The right and left second linking members 62, 72 are arranged so as to intersect the suspension links 42 below the right and left, and intersect the right and left airframe frames 30, in plan view. ..

(Control system configuration)
As shown in FIGS. 6 and 7, the steering angle sensor 68 (corresponding to the steering angle detection unit) is supported by the frame 65 (see FIGS. 3 and 4), and the steering angle sensor 68 is viewed in a plan view. It is arranged between the mission case 18 and the right and left relay members 60 and 70 in a side view.

The linking rod 69 is connected to the steering member 35 and the steering angle sensor 68, and the steering angle sensor 68 is connected to the steering angle (orientation) of the front wheel 1 via the steering member 35 and the steering rod 69. ) Can be detected. The control device 80 is supported by the airframe frame 30, and the detection value of the steering angle sensor 68 and the detection value of the angle sensor 59 are input to the control device 80.

The control device 80 is described later (operating state of the side clutch operating unit in the straight-ahead state) (side clutch operating unit in the right-turning state) based on the detection value of the steering angle sensor 68 and the detection value of the angle sensor 59. (Operating state of) (Operating state of the side clutch operating unit in the left turning state), the electric motor 64 of the side clutch operating unit 50 (driving unit 54) is operated and operated by the electric motor 64. The gear 58 is operated to the neutral position A1, the one-side operation position A2, and the other-side operation position A3.

(Operating state of the side clutch operation unit in the straight-ahead state)
As shown in FIGS. 6 and 7, in the steering angle (direction) of the front wheel 1, the right setting angle R1 is set between the straight-ahead position N and the right steering limit R2. The left set angle L1 is set between the straight-ahead position N and the left steering limit L2, and the right set angle R1 and the left set angle L1 are the same values.

When the steering angle (direction) of the front wheel 1 is located within the range of the set angle R1 to the right from the straight-ahead position N and the range of the set angle L1 to the left from the straight-ahead position N, the passenger-type rice transplanter is in a substantially straight-ahead state. be. In this state, as shown in FIG. 7, the operation gear 58 is operated to the neutral position A1 by the electric motor 64.

When the operation gear 58 is operated to the neutral position A1, the right and left operation units 73 and 74 are operated to turn on the transmission position, and the right and left side clutches 51 and 52 are operated to the transmission state. In this state, the pins 73b and 74b of the right and left operating portions 73 and 74 are located at the rear ends of the connecting holes 62b and 72b of the right and left second linking members 62 and 72.

(Operating state of the side clutch operation unit in the right turning state)
As shown in FIGS. 6 and 7, when the front wheel 1 is steered to the right beyond the right set angle R1 (the steering angle (direction) of the front wheel 1 is the right set angle R1 and the right steer). (If it is located within the range of the limit R2), the passenger-type rice transplanter will be in a right-turning state. In this state, the electric motor 64 reciprocates the operation gear 58 over the neutral position A1 and the one-side operation position A2.

When the operating gear 58 is operated from the neutral position A1 to the one-sided operating position A2, the first linking member 61 on the right is pulled toward the operating gear 58 (see direction B11), and the relay member 60 on the right is shown in FIG. The second linking member 62 on the right is pulled toward the relay member 60 on the right by swinging counterclockwise (see direction B11). The right operation unit 73 is operated to turn off the shutoff position, and the right side clutch 51 is operated to the cutoff state via the connection portion 62a of the right second linking member 62.

When the operation gear 58 is operated from the one-side operation position A2 to the neutral position A1, the right first linking member 61 is pushed toward the right relay member 60 (see direction B12), and the right relay member 60 is moved. The second linking member 62 on the right is pushed toward the operation unit 73 on the right by swinging clockwise in FIG. 7 (see direction B12). Since the right side clutch 51 is urged to the transmission state (see (the transmission system of the rear axle case) described above), the right operation unit 73 is operated to turn on the transmission position, and the right side clutch 51 is operated. It is operated to the transmission state.

When the operation gear 58 is operated from the neutral position A1 to the one-side operation position A2, the left first linking member 71 is pushed toward the left relay member 70 (see direction B22), and the left relay member 70 is moved. The second linking member 72 on the left is pushed toward the operation unit 74 on the left by swinging counterclockwise in FIG. 7 (see direction B22).

When the operating gear 58 is operated from the one-sided operating position A2 to the neutral position A1, the left first linking member 71 is pulled toward the operating gear 58 (see direction B21), and the left relay member 70 is shown in FIG. The second linking member 72 on the left is pulled toward the relay member 70 on the left (see direction B21).

In this case, due to the flexible action of the connection hole 72b of the left second linking member 72, the operation from the neutral position A1 of the operation gear 58 to the one-side operation position A2 is performed by the left operation unit 74 (left side clutch 52). The connection portion 72a of the second linking member 72 on the left reciprocates with respect to the operation portion 74 on the left between the position shown by the solid line and the position shown by the dotted line in FIG.

As a result, the left operation unit 74 is not operated to turn off the cutoff position, and the left side clutch 52 is urged to the transmission state (see the above-mentioned (transmission system of the rear axle case)), so that the left side clutch 52 is not operated. The side clutch 52 is maintained in the transmission state, and the left operation unit 74 is maintained in the transmission position ON.

As described above, the operation gear 58 is reciprocally driven over the neutral position A1 and the one-side operation position A2 by the electric motor 64, so that the left side clutch 52 is operated (maintained) in the transmission state while the right side clutch 52 is operated (maintained). The side clutch 51 is operated alternately and repeatedly in the transmission state and the cutoff state.

(Operating state of the side clutch operation unit in the left turn state)
As shown in FIGS. 6 and 7, when the front wheel 1 is steered to the left beyond the left set angle L1 (the steering angle (direction) of the front wheel 1 is the left set angle L1 and the left steer). (If it is located within the range of the limit L2), the passenger-type rice transplanter will be in a left-turning state. In this state, the electric motor 64 reciprocates the operation gear 58 over the neutral position A1 and the other side operation position A3.

When the operating gear 58 is operated from the neutral position A1 to the other side operating position A3, the left first linking member 71 is pulled toward the operating gear 58 (see direction B21), and the left relay member 70 is shown in FIG. The second linking member 72 on the left is pulled toward the relay member 70 on the right (see direction B21). The left operation unit 74 is operated to turn off the shutoff position, and the left side clutch 52 is operated to the cutoff state via the connection portion 72a of the left second linking member 72.

When the operation gear 58 is operated from the other side operation position A3 to the neutral position A1, the left first linking member 71 is pushed toward the left relay member 70 (see direction B22), and the left relay member 70 is moved. The second linking member 72 on the left is pushed toward the operation unit 74 on the left by swinging counterclockwise in FIG. 7 (see direction B22). Since the left side clutch 52 is urged to the transmission state (see (the transmission system of the rear axle case) described above), the left operation unit 74 is operated to turn on the transmission position, and the left side clutch 52 is activated. It is operated to the transmission state.

When the operation gear 58 is operated from the neutral position A1 to the other side operation position A3, the right first linking member 61 is pushed toward the right relay member 60 (see direction B12), and the right relay member 60 is moved. The second linking member 62 on the right is pushed toward the operation unit 73 on the right by swinging clockwise in FIG. 7 (see direction B12).

When the operating gear 58 is operated from the other side operating position A3 to the neutral position A1, the first linking member 61 on the right is pulled toward the operating gear 58 (see direction B11), and the relay member 60 on the right is shown in FIG. The second linking member 62 on the right is pulled toward the relay member 60 on the right by swinging counterclockwise (see direction B11).

In this case, due to the flexible action of the connection hole 62b of the right second linking member 62, the operation from the neutral position A1 of the operation gear 58 to the other side operation position A3 is performed by the right operation unit 73 (right side clutch 51). Not transmitted, the connecting portion 62a of the second linking member 62 on the right reciprocates with respect to the operating portion 73 on the right between the position shown by the solid line and the position shown by the dotted line in FIG.

As a result, the right operation unit 73 is not operated to turn off the cutoff position, and the right side clutch 51 is urged to the transmission state (see the above-mentioned (transmission system of the rear axle case)), so that the right side clutch 51 is not operated. The side clutch 51 of the above is maintained in the transmission state, and the right operation unit 73 is maintained in the transmission position ON.

As described above, the operation gear 58 is reciprocally driven over the neutral position A1 and the other side operation position A3 by the electric motor 64, so that the right side clutch 51 is operated (maintained) in the transmission state and left. The side clutch 52 is operated alternately and repeatedly in the transmission state and the cutoff state.

(Transmission system to leveling equipment)
As shown in FIG. 6, inside the rear axle case 22, the output shaft 75 is supported backward, and the bevel gear 75a connected to the output shaft 75 meshes with the bevel gear 48a of the transmission shaft 48, and the output shaft 75 A ground leveling clutch 76 is provided on the ground surface.

As shown in FIGS. 3, 4, and 6, the output case 77 is rearwardly connected to the rear part of the rear axle case 22, and the output case 78 can swing up and down around the axis P8 along the left-right direction. Is supported by.

The power of the leveling clutch 76 is the bevel gear mechanism inside the output case 77 (not shown), the transmission shaft (not shown) arranged concentrically with the shaft core P8 over the output cases 77 and 78, and the output case. It is transmitted to the rearward output shaft 79 of the output case 78 via the bevel gear mechanism (not shown) inside the 78.

As shown in FIGS. 8 and 9, in the ground leveling device 11, a drive case 81 is attached to the left and right center portions of the drive shaft 11a of the leveling device 11 via bearings (not shown). The input shaft 82 is forwardly supported by the drive case 81, and inside the drive case 81, a bevel gear (not shown) connected to the input shaft 82 and a bevel gear connected to the drive shaft 11a of the leveling device 11 (not shown). (Not shown) is in occlusion. A stretchable transmission shaft 83 is connected to the output shaft 79 and the input shaft 82 via a universal joint 84.

With the above configuration, the power of the transmission shaft 48 is transmitted to the input shaft 82 via the output shaft 75, the ground leveling clutch 76, the output shaft 79, and the transmission shaft 83, and the drive shaft 11a of the ground leveling device 11 is countered by FIG. It is driven to rotate clockwise.

(Operation system of leveling clutch)
As shown in FIGS. 4, 8 and 9, the link mechanism 3 has a vertical link 3c connected to the rear of the right and left upper link 3a, the right and left lower link 3b, the upper link 3a and the lower link 3b. The seedling planting device 5 is supported by the vertical link 3c. A channel-shaped connecting member 85 is connected to the rear end of the hydraulic cylinder 4 in a plan view, and the connecting member 85 is connected to a connecting portion between the lower link 3b and the vertical link 3c of the link mechanism 3.

As shown in FIGS. 4 and 8, an operation arm 86 for operating the leveling clutch 76 in a transmission state and a cutoff state is provided, and a linking rod 87 is connected to the upper link 3a of the link mechanism 3 and the operation arm 86. Has been done.

As shown in FIGS. 8 and 9, the operation member 88 is connected to the output case 78, and the linking rod 89 is connected to the lower link 3b of the link mechanism 3 and the operation member 88. The operating member 90 is connected to the drive case 81, and the linking rod 91 is connected to the connecting member 85 and the operating member 90.

The states shown in FIGS. 1 and 8 are states in which the seedling planting device 5 is lowered by the link mechanism 3 and the hydraulic cylinder 4. In this state, the linking rod 87 is lowered, and the leveling clutch 76 is operated in the transmission state by the operation arm 86.

In the state where the seedling planting device 5 is lowered, the linkage rod 89 is lowered, and the output case 78 and the output shaft 79 are obliquely downward. The linking rod 91 is lifted so that the drive case 81 and the input shaft 82 are oriented horizontally or diagonally upward. As a result, the bending of the universal joint 84 is suppressed to a small extent, and the power of the output shaft 79 is reasonably transmitted to the input shaft 82 via the transmission shaft 83 and the universal joint 84.

The state shown in FIG. 10 is a state in which the seedling planting device 5 is lifted by the link mechanism 3 and the hydraulic cylinder 4. In this state, the linking rod 87 is lifted, the ground leveling clutch 76 is operated to the shutoff state by the operation arm 86, and the leveling device 11 is stopped.

In the state where the seedling planting device 5 is lifted, the linkage rod 89 is lifted so that the output case 78 and the output shaft 79 are obliquely upward. The linking rod 91 is lowered, and the drive case 81 and the input shaft 82 are directed diagonally downward. As a result, the bending of the universal joint 84 is kept small.

(First Different Form of Implementation of the Invention)
Instead of the 5-link type suspension mechanism, a 3-link type suspension mechanism having right and left suspension links and lateral links may be adopted.
The suspension mechanism may be abolished so that the rear axle case 22 can be rolled around the axis along the front-rear direction and supported by the airframe frame 30, and the rear axle case 22 cannot move up and down to the airframe frame 30. Moreover, it may be connected so that it cannot be rolled.

(Second alternative form of carrying out the invention)
The right interchangeable portion is connected to the operation gear 58 and the right first linking member 61, the connecting portion between the right first linking member 61 and the right relay member 60, and the right second linking member 62 and the right. It may be provided at the connection portion with the relay member 60 of.

The left interchangeable portion is a connecting portion between the operation gear 58 and the left first linking member 71, a connecting portion between the left first linking member 71 and the left relay member 70, and the left second linking member 72 and the left. It may be provided at the connection portion with the relay member 70 of.

(Third alternative form of carrying out the invention)
In the side clutch operation unit 50, the right and left drive units 54 may be directly attached to the rear axle case 22. According to this configuration, the right linking mechanism 55 connected over the right drive unit 54 and the right side clutch 51 is attached to the rear axle case 22, and the left drive unit 54 and the left side clutch 52 are attached. The left coupling mechanism 56 connected to the rear axle case 22 is attached to the rear axle case 22.
According to this configuration, the right and left side clutches 51 and 52 are operated independently of each other in the transmission state and the cutoff state, so that the accommodation portion becomes unnecessary.

The present invention can be applied not only to a passenger-type rice transplanter, but also to a passenger-type direct sowing machine that supplies seeds to the rice field surface and a passenger-type management machine that supplies chemicals to the rice transplanter surface.

1 Front wheel 1a Axle 2 Rear wheel 2a Axle 22 Rear axle Case 30 Aircraft frame 41 Suspension link 42 Suspension link 47 Suspension spring 50 Side clutch operation part 51 Side clutch 52 Side clutch 54 Drive part 55 Coordination mechanism 56 Coordination mechanism 60 Relay member 61 1 Linking member 62 2nd linking member 62b Flexible part 64 Electric motor (actor)
58 Operation gear (reciprocating member)
68 Steering angle sensor (steering angle detector)
70 Relay member 71 1st linking member 72 2nd linking member 72b Flexible part A1 Neutral position A2 One side operation position A3 Other side operation position N Straight position R1 Setting angle L1 Setting angle P3 Jikushin P4 Jikushin

Claims (7)

Right and left front wheels that are steerable and rotationally driven,
The right and left rear wheels, the right side clutch capable of transmitting and disconnecting power to the right rear wheel, and the left side clutch capable of transmitting and disconnecting power to the left rear wheel.
The steering angle detection unit that detects the orientation of the front wheels,
Based on the detection of the steering angle detection unit, a side clutch operation unit capable of operating the right and left side clutches in a transmission state and a cutoff state is provided.
The side clutch operation unit is
When the front wheel is located within the range of the right and left set angles from the straight-ahead position, the right and left side clutches are operated in the transmission state.
When the front wheel is steered to the right beyond the right set angle, the right side clutch is alternately repeated in the transmission state and the cutoff state while operating the left side clutch in the transmission state. Operate and
When the front wheel is steered to the left beyond the left set angle, the left side clutch is alternately repeated in the transmission state and the cutoff state while operating the right side clutch in the transmission state. Paddy field work machine to operate. The side clutch operating unit includes a driving unit and a linking mechanism that transmits the operation of the driving unit to the right and left side clutches to operate the right and left side clutches in a transmission state and a disengagement state. The paddy field working machine according to claim 1. A rear axle case is provided to support the right and left rear wheels and accommodate the right and left side clutches.
The linking mechanism includes a relay member arranged between the axle of the front wheel and the axle of the rear wheel in a side view, a first linking member connected over the drive unit and the relay member, and the above. The paddy field working machine according to claim 2, further comprising a relay member and a second linking member connected over the right and left side clutches. When viewed from the side, it was supported by a portion of the fuselage frame between the axles of the front wheels and the axles of the rear wheels so as to be vertically swingable around the axis along the left-right direction, and extended rearward from the axis. Equipped with right and left suspension links,
The rear axle case is supported by the rear portion of the suspension link, and is supported by the airframe frame via a suspension spring.
The paddy field working machine according to claim 3, wherein the relay member is arranged between the right and left suspension links in a plan view. The paddy field working machine according to claim 4, wherein the second linking member is arranged along the right and left suspension links in a side view. The paddy field working machine according to any one of claims 3 to 5, wherein the drive unit is arranged at a position rearward from the relay member and at a position higher than the rear axle case. The drive unit has an actuator and a reciprocating member driven reciprocating by the actuator, and the actuator reciprocates the reciprocating member over a neutral position and a one-sided operation position. Reciprocates the reciprocating member over the neutral position and the operation position on the other side.
The right linking mechanism connected to the reciprocating member and the right side clutch, and the left linking mechanism connected to the reciprocating member and the left side clutch are provided. ,
The right linkage mechanism is
When the reciprocating member is operated to the neutral position, the right side clutch is operated to the transmission state, and when the reciprocating member is operated to the one-side operation position, the right side clutch is disengaged. And even if the reciprocating member is operated to the other side operating position, the operation of the reciprocating member to the other side operating position is not transmitted to the right side clutch, and the right side is not transmitted. It has the right flexibility to keep the clutch in the transmission state,
The left linkage mechanism is
When the reciprocating member is operated to the neutral position, the left side clutch is operated to the transmission state, and when the reciprocating member is operated to the other side operating position, the left side clutch is disengaged. And even if the reciprocating member is operated to the one-sided operating position, the operation of the reciprocating member to the one-sided operating position is not transmitted to the left side clutch, and the left side is not transmitted. The paddy field working machine according to any one of claims 2 to 6, which has a left accommodation portion for keeping the clutch in a transmission state.

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