JP7433151B2 - Paddy field work machine - Google Patents

Description

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

As disclosed in Patent Document 1, a four-wheel drive riding rice transplanter, which is an example of a paddy field working machine, is not provided with a differential mechanism for the right and left rear wheels, and the right rear wheel is not provided with a differential mechanism for the right and left rear wheels. Some vehicles are equipped with a right side clutch that can transmit and cut off power to the wheels, and a left side clutch that can transmit and cut off power to the left rear wheel.

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

For example, when the front wheels are steered significantly to the right and a right turn is performed, the right side clutch is operated to the disengaged state, and the three wheels, the right and left front wheels, and the left rear wheel, are rotationally driven. A right turn is made.
In this case, by operating the right side clutch to the disengaged state, the right rear wheel becomes in a free rotation state, and as the vehicle turns to the right, it gradually rotates and changes its direction to the right. By allowing the rear wheels on the side of the turning center to freely rotate in this way, it is possible to reduce the situation in which the field surface is disturbed by the rear wheels on the side of the turning center.

Japanese Patent Application Publication No. 2014-161318

For example, in deep paddy fields, in cases where the mud in the paddy fields contains a large amount of clay, or in the case of large paddy field working machines with heavy bodies, the resistance exerted on the rear wheels becomes large.
Even if a turn is made and the side clutch on the center side of the turn is disengaged when a large amount of resistance is applied to the rear wheel, the rear wheel on the center side of the turn will rotate little by little due to the large resistance applied to the rear wheel. In some cases, the rear wheel on the turning center side changes direction in the turning direction while remaining stopped at that position.

As mentioned above, if a situation occurs where the rear wheel on the center side of the turn changes direction while remaining stopped at that position, there is a possibility that the rear wheel on the center side of the turn will damage the rice field. There's room.

SUMMARY OF THE INVENTION An object of the present invention is to reduce the situation in which a rear wheel on the center side of the turn damages the field surface when turning in a four-wheel drive type paddy field working machine.

The rice paddy work machine of the present invention has right and left front wheels that can be steered and rotationally driven, right and left rear wheels, and a right side clutch that can transmit and interrupt power to the right rear wheels. , a left side clutch capable of transmitting and interrupting power to the left rear wheel; a steering angle detection unit that detects the direction of the front wheel; and a steering angle detection unit that detects the direction of the front wheel; and a side clutch operating section that can operate the side clutch of the vehicle to a transmission state and a disengaged state, and the side clutch operating section is configured to operate the right side clutch when the front wheel is located within a range of set angles to the right and left from the straight-ahead position. When the left side clutch is operated to the transmission state and the front wheels are steered to the right beyond the right setting angle, the right side clutch is operated to the transmission state while the left side clutch is operated to the transmission state. is operated alternately between a transmission state and a disengaged state, and when the front wheel is steered to the left beyond the left setting angle, the left side clutch is operated to the transmission state and the left The side clutch is operated alternately and repeatedly between a transmission state and a disengaged state , and the side clutch operation section transmits the operation of the drive section and the right and left side clutches to the right and left side clutches. a linkage mechanism for operating the left side clutch into a transmission state and a disconnection state; the drive unit includes an actuator; and a reciprocating member driven reciprocally by the actuator; Drive the moving member back and forth .

According to the present invention, when the front wheels are steered from the straight-ahead position to within the right and left set angle ranges, the right and left side clutches are operated to the transmission state, and the right and left front wheels, right and left side clutches are operated to the transmission state. The four left rear wheels are now driven to rotate.

According to the present invention, when the front wheels are steered to the right (left) beyond the right (left) set angle, the right and left front wheels and the rear wheel on the outside of the turn are rotated and the turning center is rotated. The side clutch on the side is operated alternately and repeatedly between a transmission state and a disconnection state.
As a result, even if the rear wheel on the turning center side stops when the side clutch on the turning center side is operated to the disengaged state, the next time the side clutch on the turning center side is operated to the transmission state, the turning 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 center side of the turn are configured to repeatedly rotate and stop, so that the rear wheels on the center side of the turn are stopped at that position. This allows the rear wheels on the center side of the turn to rotate little by little while changing direction, preventing the rear wheels on the center side of the turn from turning in the direction of the turn. It is possible to reduce the number of situations where

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

According to the present invention, the side clutch on the side of the turning center is operated repeatedly and alternately between the transmission state and the disconnected state, and the half-transmission state of the side clutch on the side of the turning center is unlikely to occur, so that the above-mentioned problems are not caused. There are few.

According to the present invention, by controlling the drive unit in the side clutch operating unit, it is easy to repeatedly operate the side clutch on the side of the turning center alternately between the transmission state and the disconnected state.
Furthermore, the transmission time and the disconnection time are set to the same length in the transmission time when the side clutch on the side of the turning center is operated in the transmission state and the disconnection time when the side clutch on the side on the turning center side is operated in the disengaged state. Control such as setting and lengthening or shortening the transmission time with respect to the cut-off time can be easily performed by controlling the drive section.

According to the present invention, in the side clutch operation section, the operation of the drive section is configured to be transmitted to the right and left side clutches via the linkage mechanism, so that the drive section is placed at a relatively high position upwardly away from the surface. This makes it easier to place the drive unit in the desired position, and it is possible to suppress mud and water from adhering 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 linkage mechanism includes an axle of the front wheel and an axle of the rear wheel in a side view. a first linking member connected between the drive unit and the relay member; and a first linking member connected between the relay member and the right and left side clutches. It is preferable to have two linking members.

Paddy field work equipment is sometimes provided with a rear axle case that supports the right and left rear wheels, and the rear axle case is supported by the machine frame so that it can roll or is supported by the machine 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, in the linkage mechanism of the side clutch operating section, the relay member of the linkage mechanism is disposed in front of the rear axle case, and the second Linkage members extend rearward from the relay member and are connected to right and left side clutches of the rear axle case.
As a result, even if the rear axle case performs a rolling operation or moves up and down due to the suspension mechanism, the second linking member of the linkage mechanism swings around the relay member as a fulcrum, allowing the rear axle case to perform a rolling action or move up and down. Motion is easily absorbed.

According to the present invention, the first linkage member of the linkage mechanism is connected across the drive unit and the relay member of the linkage mechanism, so that the first linkage member of the linkage mechanism moves the drive unit upwardly away from the surface. It can be easily placed at a relatively high position.

In the present invention, in a side view, the body frame is supported in a portion between the axle of the front wheel and the axle of the rear wheel so as to be swingable up and down about an axis along the left-right direction; Extended right and left suspension links are provided, the rear axle case is supported by the rear part of the suspension link and supported by the fuselage frame via a suspension spring, and the relay member is Preferably, the suspension link is disposed between the right and left suspension links.

In paddy field work equipment, when the rear axle case is configured to be supported by the machine frame via a suspension mechanism, right and left The suspension link may be configured to be supported so as to be able to swing up and down and extend rearward, and the rear axle case is supported at the rear of the suspension link and supported by the fuselage frame via a suspension spring. (For example, 5-link type, 3-link type, 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 utilized. , 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 when viewed from the side.

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 plan view, the second linkage member of the linkage mechanism is arranged between the right and left suspension links in side view. By being arranged along the suspension link, the second linking member of the linking mechanism can be arranged compactly.

In the present invention, it is preferable that the drive section is disposed at a position on the rear side of the relay member and at a position higher than the rear axle case.

In rice paddy work machines, the driver's seat is placed above the rear axle case, and a floor on which the driver rests his/her feet while standing or sitting in the driver's seat is sometimes provided in front of the driver's seat. There may be a space between you and the seat.

According to the present invention, if a space is created above the rear axle case, the drive unit can be placed in this space, so the space created above the rear axle case can be effectively utilized to make the drive unit compact. can be placed in

In the present invention , the drive unit causes the actuator to reciprocate the reciprocating member between a neutral position and an operating position on one side, and the actuator causes the reciprocating member to move between the neutral position and the operating position on the other side. The right linkage mechanism is connected across the reciprocating member and the right side clutch, and the linkage mechanism is connected across the reciprocating member and the left side clutch. and the right linkage mechanism operates the right side clutch to a transmission state when the reciprocating member is operated to the neutral position, and the right linkage mechanism operates the right side clutch to a transmission state, so that the reciprocating member moves to the one side clutch. When operated to the side operation position, the right side clutch is operated to the disconnected state, and even when the reciprocating member is operated to the other side operation position, the reciprocating member is returned to the other side operation position. the right side clutch is not transmitted to the right side clutch and the right side clutch is maintained in a transmission state, and the left linkage mechanism is configured such that the reciprocating member When the left side clutch is operated to the neutral position, the left side clutch is operated to a transmission state, and when the reciprocating member is operated to the other side operation position, the left side clutch is operated to a disengaged state, and , even if the reciprocating member is operated to the one side operating position, the movement of the reciprocating member to the one side operating position is not transmitted to the left side clutch, and the left side clutch is in a transmission state. Preferably, it has a left flex to ensure that it is maintained.

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

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

According to the present invention, the actuator can perform a simple operation of reciprocating the reciprocating member between the neutral position and the operating position on one side, and driving the reciprocating member reciprocally between the neutral position and the operating position on the other side. By this simple operation, the right side clutch can be operated between the transmission state and the disconnection state, and the left side clutch can be operated between the transmission state and the disconnection state. This is advantageous in terms of simplifying the side clutch operating section.

It is a left side view of a riding-type rice transplanter. FIG. 2 is a plan view of a riding rice transplanter. FIG. 3 is a left side view of the vicinity of the fuselage frame. FIG. 3 is a plan view of the vicinity of the fuselage frame. FIG. 3 is an exploded perspective view of a side clutch operating section. FIG. 3 is a schematic plan view showing a transmission system for front wheels and rear wheels, and a side clutch operating section. FIG. 3 is a schematic plan view showing an operating state of a side clutch operating section. It is a left side view of the vicinity of the link mechanism in a state where the seedling planting device is lowered. FIG. 3 is an exploded perspective view of the vicinity of the link mechanism. It is a left side view of the vicinity of the link mechanism in a state where the seedling planting device is operated to rise.

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

(Overall configuration of riding rice transplanter)
As shown in FIGS. 1 and 2, the riding rice transplanter is equipped with a link mechanism 3 and a link mechanism 3 that can be moved up and down at the rear of a body frame 30 that includes right and left front wheels 1 and right and left rear wheels 2. 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 body frame 30 so as to be movable up and down. In addition to the seedling planting device 5, the riding rice transplanter is equipped with a soil leveling device 11, a fertilizing device 12, and a chemical spraying device 28.

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

In the seedling planting device 5, the rotary case 7 is driven to rotate while the seedling stand 10 is driven horizontally, 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.

(Configuration of soil leveling device)
As shown in FIGS. 1 and 8, a soil leveling device 11 for leveling the rice field is supported at the lower part of the front part of the seedling planting device 5. A rotatably supported drive shaft 11a and a number of ground leveling bodies 11b attached to the drive shaft 11a are provided. By rotationally driving the drive shaft 11a of the soil leveling device 11 in the counterclockwise direction in FIG. 8, the field leveling body 11b of the soil leveling device 11 levels the rice field.

(Configuration of fertilizer application device and chemical spraying device)
As shown in FIGS. 1 and 2, a fertilizer application device 12 is supported across the rear of the body frame 30 and the seedling planting device 5, and the fertilizer application device 12 includes a hopper 13, a feeder 14, a blower 15, and a seedling planting device 5. A groove device 16, a hose 17, etc. are provided.

In the fertilizer application device 12, a hopper 13 for storing fertilizer and a feeding section 14 are provided at the upper part of the rear part of the body frame 30, and a blower 15 is provided on the left lateral outside of the feeding section 14. A groover 16 is attached to the float 9, and a hose 17 is connected across the feeding portion 14 and the groover 16.

In the fertilizer application device 12, the fertilizer in the hopper 13 is fed out by the feeding unit 14, and is supplied to the furrower 16 through the hose 17 by the conveying wind of the blower 15, and the furrower 16 forms grooves on the rice field. At the same time, fertilizer is supplied from the furrower 16 to the furrows on the rice field.

A chemical spraying device 28 is supported by a support frame 29 connected to the planting transmission case 6 in the center. From the chemical spraying device 28, chemicals such as herbicides are sprayed onto the rice field behind the seedling planting device 5.

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

As shown in FIG. 6, a front wheel support case 21 is connected to the right and left parts of the transmission case 18, and the right and left front wheels 1 are supported by the front wheel support case 21 so as to be steerable.
A rear axle case 22 is supported at the rear of the body frame 30, and the right and left rear wheels 2 are supported by the rear axle case 22.

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

As shown in FIGS. 3, 4, and 6, an output shaft 25 is supported rearward at the rear of the mission case 18. The power branched from the sub-transmission device 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 in (Transmission system of rear axle case) below. The signal is transmitted to the right and left rear wheels 2 as shown in FIG.

(Configuration of front wheel steering operation)
As shown in FIGS. 1 and 2, a control handle 32 is provided at the front of the fuselage frame 30, and a shift lever 37 is provided at the left side of the control handle 32. is operated steplessly from the neutral stop position to the forward and reverse sides.

Right and left support members 38 in the form of vertical walls are provided at the rear of the right and left fuselage frames 30, and are connected to the driver's seat 33, the hopper 13 of the fertilization device 12, and the feeding section 14 (as described above). (see "Configuration of Spreading Device") is supported on the upper part of the support member 38. A floor 34 on which the driver places his feet while standing or sitting on the driver's seat 33 is provided at a low position between the operating handle 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 an axis P2 along the vertical direction. A tie rod 36 is connected between the front wheels 1 and the right and left front wheels 1. By operating the steering handle 32, the steering member 35 is steered from the straight-ahead position N to the right steering limit R2 and the left steering limit L2. A steering operation is performed.

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

In side view, right and left brackets 39 are located 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 the right and left body frames 30. connected. The right and left upper suspension links 41 are supported by the bracket 39 so as to be swingable up and down about an axis P3 along the left-right direction, and extend rearward from the axis P3.

When viewed from the side, a bracket 40 is connected to a portion of the right and left body 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 across the right and left parts of the bracket 40 and the rear parts of the right and left body frames 30. The lower right and left suspension links 42 are supported by the bracket 40 so as to be swingable up and down about an axis P4 along the left-right direction, and extend rearward from the axis P4.

Right and left support brackets 44 are connected to the front right and left parts of the rear axle case 22 . The rear parts of the right and left upper suspension links 41 are swingably supported by the upper parts of the right and left support brackets 44. The rear parts of the right and left lower suspension links 42 are swingably supported by the lower parts of the right and left support brackets 44.

A lateral link 43 is arranged at the rear of the rear axle case 22, and the lateral link 43 is swingably connected to the rear part of the left fuselage frame 30 and the right part of the rear part of the rear axle case 22. There is.

Right and left support brackets 45 are connected to the right and left parts of the front part of the rear axle case 22, and spring receivers 46 are connected to the rear parts of the right and left body frames 30. Right and left suspension springs 47 are attached across the support bracket 45 and the spring receiver 46, and the rear axle case 22 is supported by the body frame 30 via the suspension springs 47.

As described above, the right and left upper suspension links 41, the right and lower left suspension links 42, the lateral links 43, and the right and left suspension springs 47 constitute a five-link type suspension mechanism.

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

A right side clutch 51 and a left side clutch 52 are provided on the right and left sides of the power transmission shaft 48 . The right and left side clutches 51, 52 are configured in a friction multi-plate type, and are biased into a transmission state by an internal spring (not shown). A gear type right speed reduction mechanism 49 is provided across the right side clutch 51 and the axle 2a of the right rear wheel 2, and a gear type right speed reduction mechanism 49 is provided across the left side clutch 52 and the axle 2a of the left rear wheel 2. A gear-type left speed 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 speed reduction mechanism 49. It is transmitted to the left rear wheel 2 via the left side clutch 52 and the left speed reduction mechanism 49.

(Overview of right and left side clutch operation system)
As shown in FIGS. 5, 6, and 7, a side clutch operation section 50 is provided for operating the right and left side clutches 51, 52 into a transmission state and a disconnection state. The side clutch operating section 50 includes a drive section 54, a right linkage mechanism 55, and a left linkage mechanism 56.

The right linkage mechanism 55 connects the drive unit 54 and the right side clutch 51 so as to transmit the operation of the drive unit 54 to the right side clutch 51 and operate the right side clutch 51 into a transmission state and a disconnection state. connected across.

The left linkage mechanism 56 connects the drive unit 54 and the left side clutch 52 so as to transmit the operation of the drive unit 54 to the left side clutch 52 and operate the left side clutch 51 into the transmission state and the disconnection state. are connected across.

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

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

A gear mechanism 63 having a pinion gear 63a is attached to the support member 57, and the pinion gear 63a of the gear mechanism 63 meshes with the operating gear 58. An electric motor 64 (corresponding to an actuator) that drives the gear mechanism 63 is attached to the gear mechanism 63. The operation gear 58 is reciprocated around the axis P5 by the electric motor 64 via the gear mechanism 63.

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

(Configuration of right and left linkage mechanisms in side clutch operating section)
As shown in FIGS. 5, 6, and 7, the right linkage mechanism 55 includes a right relay member 60, a right first linkage member 61, and a right second linkage member 62. The left linkage mechanism 56 includes a left relay member 70, a left first linkage member 71, and a left second linkage member 72.

As shown in FIGS. 3, 4, and 5, right and left brackets 66 are connected to the front portions of the right and left frames 65, and a relay shaft 67 is supported across the right and left brackets 66. The right relay member 60 and the left relay member 70 are supported by a relay shaft 67 so as to be able to swing independently from each other around an axis P6 along the left-right direction.

As a result, the right and left relay members 60, 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) when viewed from the side, and when viewed from the top. It is arranged between the right and left suspension links 41 and 42, and between the right and left fuselage frames 30.

The right relay member 60 is configured such that an upward arm 60b and a downward arm 60c are connected to a boss portion 60a rotatably attached to a relay shaft 67. The left relay member 70 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 right first linking member 61 is connected across the operating gear 58 of the drive unit 54 and the arm 60b of the right relay member 60. The left first linking member 71 is connected across the operating 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, a right operating section 73 and a left operating section 74 that can operate the right and left side clutches 51, 52 to a transmission state and a disconnection state are arranged along the vertical direction. It is supported downward by the rear axle case 22 so as to be swingable around the axis P7.

The front part of the right second linking member 62 is connected to the arm 60c of the right relay member 60, the connecting part 62a is connected to the rear part of the right second linking member 62, and the elongated connecting hole 62b is connected to the rear part of the right second linking member 62. (corresponding to the flexible part on the right) is opened to the connecting part 62a. An arm 73a is connected to the right operation part 73, a pin 73b connected to the arm 73a is inserted into a connection hole 62b of the right second linking member 62, and the right second linking member 62 is connected to the right operation part 73. It is connected to the right side clutch 51 via a portion 73.

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

As a result, as shown in FIGS. 3 and 4, the right and left first linking members 61, 71 extend diagonally rearward and upward from the right and left relay members 60, 70 in side view. The transmission shaft 27, the right and left fuselage frames 30, and the right and left upper suspension links 41 intersect with each other.

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

The right and left second linking members 62 and 72 are arranged along the right and left lower suspension links 42 in side view, and are arranged below the right and left lower suspension links 42. has been done. The right and left second linking members 62 and 72 are arranged to intersect with the right and left lower suspension links 42 and intersect with the right and left fuselage 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 section) is supported by the frame 65 (see FIGS. 3 and 4), and the steering angle sensor 68 is It is arranged between the mission case 18 and the right and left relay members 60 and 70 when viewed from the side.

A linking rod 69 is connected between the steering member 35 and the steering angle sensor 68, and the steering angle sensor 68 measures the steering angle (direction) of the front wheels 1 via the steering member 35 and the linking rod 69. ) can be detected. A control device 80 is supported by the body frame 30 , and the detected values of the steering angle sensor 68 and the angle sensor 59 are input to the control device 80 .

Based on the detected value of the steering angle sensor 68 and the detected value of the angle sensor 59, the control device 80 determines the operating state of the side clutch operating section (in a right-turning state), which will be described later. (operating state) (operating state of the side clutch operating section in left turning state), the electric motor 64 of the side clutch operating section 50 (drive section 54) is operated. The gear 58 is operated to a neutral position A1, one side operating position A2, and the other side operating position A3.

(Operation status of side clutch operation part when driving straight)
As shown in FIGS. 6 and 7, in the steering angle (orientation) of the front wheels 1, a right set angle R1 is set between the straight-ahead position N and the right steering limit R2. A 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 have the same value.

When the steering angle (orientation) of the front wheels 1 is within the range of the set angle R1 from the straight-ahead position N to the right, and within the range of the set angle L1 from the straight-ahead position N to the left, the riding rice transplanter is in a substantially straight-ahead state. be. In this state, as shown in FIG. 7, the operating 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 parts 73 and 74 are operated to the transmission position ON, 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 operation parts 73 and 74 are located at the rear ends of the connection holes 62b and 72b of the right and left second linking members 62 and 72, respectively.

(Operation status of side clutch operating section when turning right)
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 (orientation) of the front wheel 1 is If the rice transplanter is located within the range of limit R2), the riding rice transplanter will turn to the right. In this state, the operating gear 58 is reciprocated by the electric motor 64 between the neutral position A1 and the one-side operating position A2.

When the operating gear 58 is operated from the neutral position A1 to the one-side operating position A2, the right first linking member 61 is pulled toward the operating gear 58 (see direction B11), and the right relay member 60 is moved toward the operating gear 58 in FIG. The second connecting member 62 on the right is pulled toward the relay member 60 on the right (see direction B11). The right operating portion 73 is operated to the disconnection position OFF via the connection portion 62a of the right second linking member 62, and the right side clutch 51 is operated to the disconnection state.

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 toward the right relay member 60. Swinging clockwise in FIG. 7, the right second linking member 62 is pushed toward the right operating section 73 (see direction B12). Since the right side clutch 51 is energized to the transmission state (see the above-mentioned (transmission system of rear axle case)), the right operation part 73 is operated to the transmission position ON, and the right side clutch 51 is activated. Operated in 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 pushed toward the left relay member 70. By swinging counterclockwise in FIG. 7, the left second linking member 72 is pushed toward the left operating section 74 (see direction B22).

When the operating gear 58 is operated from the one-side 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 moved toward the operating gear 58 as shown in FIG. The second connecting member 72 on the left is pulled toward the relay member 70 on the left (see direction B21).

In this case, due to the flexibility of the connection hole 72b of the second linking member 72 on the left, the movement of the operation gear 58 from the neutral position A1 to the one side operation position A2 is controlled by the left operation part 74 (left side clutch 52). Without being transmitted, the connecting portion 72a of the left second linking member 72 reciprocates between the position shown by the solid line and the position shown by the dotted line in FIG. 7 with respect to the left operating portion 74.

As a result, the left operating section 74 is not operated to the cutoff position OFF, and since the left side clutch 52 is energized to the transmission state (see the above-mentioned (transmission system of rear axle case)), the left side clutch 52 is biased to the transmission state. The side clutch 52 is maintained in the transmission state, and the left operating portion 74 is maintained in the transmission position ON.

As described above, the operating gear 58 is reciprocated by the electric motor 64 between the neutral position A1 and the one-side operating position A2, so that the left side clutch 52 is operated (maintained) in the transmission state while the right The side clutch 51 is repeatedly operated alternately between a transmission state and a disconnection state.

(Operation status of the side clutch operation part when turning left)
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 (orientation) of the front wheel 1 is If the rice transplanter is located within the range of the limit L2), the riding rice transplanter will turn to the left. In this state, the operating gear 58 is reciprocated by the electric motor 64 between the neutral position A1 and the other operating position A3.

When the operating gear 58 is operated from the neutral position A1 to the other 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 moved toward the operating gear 58 in FIG. The second connecting member 72 on the left is pulled toward the relay member 70 on the right (see direction B21). The left operating portion 74 is operated to the disconnected position OFF via the connecting portion 72a of the left second linking member 72, and the left side clutch 52 is operated to the disconnected state.

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 pushed toward the left relay member 70. By swinging counterclockwise in FIG. 7, the left second linking member 72 is pushed toward the left operating section 74 (see direction B22). Since the left side clutch 52 is energized to the transmission state (see the above-mentioned (rear axle case transmission system)), the left operating section 74 is operated to the transmission position ON, and the left side clutch 52 is activated. Operated in 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 pushed toward the right relay member 60. Swinging clockwise in FIG. 7, the right second linking member 62 is pushed toward the right operating section 73 (see direction B12).

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

In this case, due to the flexibility of the connection hole 62b of the second linking member 62 on the right, the movement of the operating gear 58 from the neutral position A1 to the other operating position A3 is controlled by the right operating section 73 (right side clutch 51). Without being transmitted, the connecting portion 62a of the right second linking member 62 reciprocates between the position shown by the solid line and the position shown by the dotted line in FIG. 7 with respect to the right operating portion 73.

As a result, the right operation part 73 is not operated to the cutoff position OFF, and since the right side clutch 51 is biased to the transmission state (see the above (transmission system of rear axle case)), the right The side clutch 51 is maintained in the transmission state, and the right operating portion 73 is maintained in the transmission position ON.

As described above, the operating gear 58 is reciprocated by the electric motor 64 between the neutral position A1 and the other operating position A3, so that the right side clutch 51 is operated (maintained) in the transmission state while the left The side clutch 52 is repeatedly operated alternately between a transmission state and a disconnection state.

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

As shown in FIGS. 3, 4, and 6, the output case 77 is connected rearward to the rear part of the rear axle case 22, and the output case 78 is vertically swingable around an axis P8 along the left-right direction. is supported by

The power of the earth leveling clutch 76 is transmitted through a bevel gear mechanism (not shown) inside the output case 77, a transmission shaft (not shown) disposed coaxially with the shaft center P8 across the output cases 77 and 78, and the output case. The signal is transmitted to the rearward output shaft 79 of the output case 78 via a bevel gear mechanism (not shown) inside the output case 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 ground leveling device 11 via bearings (not shown). The input shaft 82 is supported forward 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 (not shown) connected to the drive shaft 11a of the ground leveling device 11 are connected. (not shown) are in occlusion. An extendable power 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 earth leveling clutch 76, the output shaft 79, and the transmission shaft 83, and the drive shaft 11a of the earth leveling device 11 is Driven to rotate clockwise.

(Earning clutch operation system)
As shown in FIGS. 4, 8, and 9, the link mechanism 3 has right and left upper links 3a, right and left lower links 3b, and vertical links 3c connected to the rear portions of the upper links 3a and the lower links 3b. The seedling planting device 5 is supported by the vertical link 3c. A connecting member 85 having a channel shape in plan view is connected to the rear end of the hydraulic cylinder 4, 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 operating arm 86 is provided for operating the earth leveling clutch 76 into a transmission state and a disconnection state, and a linking rod 87 is connected between the upper link 3a of the link mechanism 3 and the operating arm 86. has been done.

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

The state shown in FIGS. 1 and 8 is a state 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 operating arm 86 operates the earth leveling clutch 76 to the transmission state.

In a state where the seedling planting device 5 is operated downward, the linking rod 89 is operated downward, and the output case 78 and the output shaft 79 are directed diagonally downward. The linking rod 91 is operated upward, and the drive case 81 and the input shaft 82 are oriented horizontally or diagonally upward. As a result, bending at the universal joint 84 is suppressed to a small extent, and the power of the output shaft 79 is easily 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 raised by the link mechanism 3 and the hydraulic cylinder 4. In this state, the linking rod 87 is operated upward, the earth leveling clutch 76 is operated to the disconnected state by the operating arm 86, and the earth leveling device 11 is stopped.

In a state where the seedling planting device 5 is operated upward, the linking rod 89 is operated upward, and the output case 78 and the output shaft 79 are directed diagonally upward. The linking rod 91 is operated downward, and the drive case 81 and the input shaft 82 are directed diagonally downward. Thereby, bending at the universal joint 84 is suppressed to a small extent.

(First alternative embodiment of the invention)
Instead of the five-link type suspension mechanism, a three-link type suspension mechanism having right and left suspension links and a lateral link may be adopted.
The suspension mechanism may be abolished, and the rear axle case 22 may be configured to be supported by the fuselage frame 30 so as to be able to roll around the axis along the longitudinal direction, and the rear axle case 22 may be supported by the fuselage frame 30 so that it cannot move up and down. In addition, they may be connected in a non-rollable manner.

(Second alternative embodiment of the invention)
The right flexible part is the connecting part between the operating gear 58 and the right first linking member 61, the connecting part between the right first linking member 61 and the right relay member 60, and the right second linking member 62 and the right connecting part. It may be provided at the connection portion with the relay member 60.

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

(Third alternative embodiment of the invention)
In the side clutch operation section 50, the right and left drive sections 54 may be directly attached to the rear axle case 22. According to this configuration, the right linkage mechanism 55 connected between the right drive section 54 and the right side clutch 51 is attached to the rear axle case 22, and the right linkage mechanism 55 is connected between the right drive section 54 and the left side clutch 52. A left linkage mechanism 56 connected over 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 into the transmission state and the disconnection state independently of each other, so that a flexible part is not required.

The present invention is applicable not only to a riding rice transplanter, but also to a riding direct seeding machine that supplies seeds to the rice field, and a riding management machine that supplies chemicals to the rice field.

1 Front wheel 1a Axle 2 Rear wheel 2a Axle 22 Rear axle case 30 Airframe frame 41 Suspension link 42 Suspension link 47 Suspension spring 50 Side clutch operation section 51 Side clutch 52 Side clutch 54 Drive section 55 Linkage mechanism 56 Linkage mechanism 60 Relay member 61 No. 1 linking member 62 2nd linking member 62b Flexible part 64 Electric motor (actuator)
58 Operation gear (reciprocating member)
68 Steering angle sensor (steering angle detection section)
70 Relay member 71 First linking member 72 Second linking member 72b Flexible part A1 Neutral position A2 One side operating position A3 Other side operating position N Straight position R1 Setting angle L1 Setting angle P3 Axis center P4 Axis center

Claims (6)

right and left front wheels that are steerable and rotationally driven;
right and left rear wheels, a right side clutch capable of transmitting and interrupting power to the right rear wheel, and a left side clutch capable of transmitting and interrupting power to the left rear wheel;
a steering angle detection unit that detects the direction of the front wheels;
a side clutch operation section that can operate the right and left side clutches into a transmission state and a disconnection state based on detection by the steering angle detection section;
The side clutch operation section is
When the front wheels are located within the right and left set angle ranges from the straight-ahead position, the right and left side clutches are operated to a transmission state;
When the front wheel is steered to the right beyond the right set angle, the right side clutch is alternately put into a transmission state and a disengaged state while operating the left side clutch into a transmission state. operate,
When the front wheel is steered to the left beyond the left set angle, the left side clutch is alternately put into a transmission state and a disengaged state while operating the right side clutch into a transmission state. operate ,
The side clutch operation section includes a drive section and a linkage mechanism that transmits the operation of the drive section to the right and left side clutches and operates the right and left side clutches into a transmission state and a disconnection state. death,
The paddy field working machine includes an actuator and a reciprocating member that is reciprocated by the actuator, and the actuator reciprocates the reciprocating member . a rear axle case supporting the right and left rear wheels and accommodating the right and left side clutches;
The linkage mechanism includes a relay member disposed between the front wheel axle and the rear wheel axle in a side view, a first linkage member connected across the drive section and the relay member, and the The paddy field work machine according to claim 1 , comprising a relay member and a second linking member connected across the right and left side clutches. When viewed from the side, the vehicle is supported in a portion between the axle of the front wheel and the axle of the rear wheel in the fuselage frame so as to be swingable up and down about an axis along the left-right direction, and extends rearward from the axis. Equipped with right and left suspension links,
The rear axle case is supported by the rear part of the suspension link and supported by the body frame via a suspension spring,
The paddy field work machine according to claim 2 , wherein the relay member is arranged between the right and left suspension links in plan view. The paddy field working machine according to claim 3 , wherein the second linking member is arranged along the right and left suspension links in a side view. The paddy field work machine according to any one of claims 2 to 4 , wherein the drive section is arranged at a position rearward of the relay member and higher than the rear axle case. The drive unit is configured to cause the actuator to reciprocate the reciprocating member between a neutral position and an operating position on one side, and to cause the actuator to drive the reciprocating member between the neutral position and an operating position on the other side. drive back and forth,
The right linking mechanism is connected across the reciprocating member and the right side clutch, and the left linking mechanism is connected across the reciprocating member and the left side clutch. ,
The linkage mechanism on the right is
When the reciprocating member is operated to the neutral position, the right side clutch is operated to a transmission state, and when the reciprocating member is operated to the one side operating position, the right side clutch is operated to a disengaged state. , and even if the reciprocating member is operated to the other side operating 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 moved to the other side operating position. Has a right flexure that allows the clutch to remain in transmission,
The linkage mechanism on the left is
When the reciprocating member is operated to the neutral position, the left side clutch is operated to a transmission state, and when the reciprocating member is operated to the other operating position, the left side clutch is operated to a disengaged state. Even if the reciprocating member is operated to the one side operating position, the movement of the reciprocating member to the one side operating position is not transmitted to the left side clutch, and the left side clutch is moved to the one side operating position. Paddy field work machine according to any one of claims 2 to 5, characterized in that it has a left flexure which allows the clutch to remain in the transmission state.

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