CN113906872A - Paddy field working machine - Google Patents

Abstract

The invention provides a paddy field working machine, aiming to reduce the state that the field surface is damaged by the rear wheel at the turning center side when the four-wheel drive type paddy field working machine turns. The paddy field work machine of the present invention comprises: a right side clutch (51) capable of transmitting and cutting off power to the right rear wheel (2); and a left side clutch (52) capable of transmitting and cutting off power to the left rear wheel (2). When the front wheel (1) is steered to the right beyond a set angle (R1) on the right, the left side clutch (52) is operated to a transmission state, and the right side clutch (51) is alternately and repeatedly operated to the transmission state and the cut-off state. When the front wheel (1) is steered to the left over a set angle (L1) on the left side, the right side clutch (51) is operated to a transmission state, and the left side clutch (52) is alternately and repeatedly operated to the transmission state and the cut-off state.

Description

Paddy field working machine

Technical Field

The present invention relates to a traveling system structure for four-wheel drive type paddy field working machines such as a riding rice transplanter and a riding direct seeder.

Background

As disclosed in patent document 1, there is a four-wheel drive type riding rice transplanter in which a right side clutch capable of transmitting and cutting off power to a right side rear wheel and a left side clutch capable of transmitting and cutting off power to a left side rear wheel are provided to right and left side rear wheels without providing a differential mechanism.

In patent document 1, in a state where the front wheels 1 are steered to the vicinity of the straight position, the right and left side clutches are operated to the transmission state, and four wheels, that is, the right and left front wheels and the right and left rear wheels, are rotationally driven.

For example, when the front wheel is largely steered to the right to turn right, the right side clutch is operated to the disengaged state, and three wheels, that is, the right and left front wheels and the left rear wheel, are rotationally driven to turn right.

In this case, the right side clutch is operated to the disengaged state, and the right rear wheel is set to the freely rotatable state, and gradually rotates with the right turn and changes its orientation to the right. By thus making the rear wheel on the turning center side in a freely rotatable state, it is possible to reduce the state in which the field surface is broken by the rear wheel on the turning center side.

For example, in deep paddy fields, in cases where the soil in the paddy field contains a large amount of clay, in cases of large-sized paddy field working machines having heavy machine bodies, and the like, the rear wheels receive a large amount of resistance.

In a state where the rear wheel receives a large resistance, even if the turning center side clutch is operated to the disengaged state by turning, the rear wheel on the turning center side may not be in a state of slowly rotating due to the large resistance received by the rear wheel, and a state may occur where the orientation of the rear wheel on the turning center side is changed in the reverse direction to the turning direction in a state where the rear wheel is stopped at that position.

If a state occurs in which the direction of the rear wheel on the turning center side is changed in the reverse direction to the turning direction while the rear wheel is stopped at this position, the field surface may be broken by the rear wheel on the turning center side, and there is room for improvement.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2014-161318

Disclosure of Invention

Problems to be solved by the invention

The invention aims to reduce the state that the field surface is damaged by the rear wheel at the turning center side when the four-wheel drive type paddy field working machine turns.

Means for solving the problems

The paddy field work machine of the present invention comprises: right and left front wheels capable of being steered and driven to rotate; right and left rear wheels; a right side clutch capable of transmitting and cutting off power to the right rear wheel; a left side clutch capable of transmitting and cutting off power to the left rear wheel; a steering angle detection unit that detects the direction of the front wheel; and a side clutch operating section capable of operating the right and left side clutches to a transmission state and a cut-off state based on detection by the steering angle detecting section, the side clutch operating part operates the right and left side clutches to a transmission state when the front wheel is located within a range of a set angle from a straight traveling position to the right and left sides, the side clutch operating section operates the left side clutch to a transmission state and repeatedly operates the right side clutch to a transmission state and a cut-off state alternately when the front wheel is steered to the right over the right set angle, when the front wheel is steered to the left over the set angle of the left side, the side clutch operating unit operates the right side clutch to a transmission state and repeatedly operates the left side clutch to the transmission state and a cut-off state alternately.

According to the present invention, when the front wheels are steered to a set angle range from the straight position to the right and left sides, the right and left side clutches are operated to the transmission state, and four wheels, that is, the right and left front wheels and the right and left rear wheels, are rotationally driven.

According to the present invention, when the front wheels are steered rightward (leftward) beyond a set angle on the right side (left side), the side clutch on the turning center side is alternately repeatedly operated to the transmission state and the cut-off state in a state where the front wheels on the right and left sides and the rear wheel on the turning outer side are rotationally driven.

Thus, even if the rear wheel on the turning center side is stopped when the side clutch on the turning center side is operated to the disengaged state, and then the rear wheel on the turning center side is rotationally driven when the side clutch on the turning center side is operated to the transmission state.

According to the present invention, the rear wheel on the turning center side is arranged to be repeatedly rotated and stopped even in a state where the rear wheel receives a large resistance, and a state in which the direction of the rear wheel on the turning center side is changed in the reverse direction to the turning direction while the rear wheel is stopped at the position can be suppressed.

As a structure different from the present invention, the following structure is considered: in the friction multi-plate type right and left side clutches, the side clutch on the turning center side is operated to a half-transmission state, and power is slowly transmitted to the rear wheel on the turning center side while the side clutch on the turning center side is slid.

In this configuration, when the rear wheel receives a particularly large resistance, the side clutch on the turning center side completely slips, and the rear wheel on the turning center side is not rotationally driven. If the side clutch on the turning center side is kept in a slipping state for a long period of time, heat generation and wear of the side clutch may occur, resulting in a decrease in durability of the side clutch.

According to the present invention, the side clutch on the turning center side is alternately repeatedly operated to the transmission state and the cut-off state, and the half transmission state of the side clutch on the turning center side is less likely to occur, so that the above-described problem is rarely caused.

In the present invention, it is preferable that the side clutch operating portion includes: a drive section; and a coupling mechanism that transmits the motion of the driving portion to the right and left side clutches, and operates the right and left side clutches to a transmission state and a cut-off state.

According to the present invention, the side clutch operating unit can easily repeat the operation of the side clutch on the turning center side alternately to the transmission state and the cutoff state by controlling the driving unit.

Further, the control of setting the transmission time and the disengagement time to the same length or making the transmission time longer or shorter than the disengagement time can be easily performed by the control of the driving section for the transmission time during which the side clutch on the turning center side is operated to the transmission state and the disengagement time during which the side clutch on the turning center side is operated to the disengagement state.

According to the present invention, since the operation of the driving unit is transmitted to the right and left side clutches via the coupling mechanism in the side clutch operating unit, the driving unit can be easily disposed at a high position upward away from the field surface, and adhesion of mud and water to the driving unit can be suppressed, which is advantageous in terms of improvement of durability of the driving unit.

In the present invention, it is preferable that: a rear axle box that supports the right and left rear wheels and accommodates the right and left side clutches, the coupling mechanism including: a relay member disposed between the axle of the front wheel and the axle of the rear wheel in a side view; a first coupling member connected between the driving part and the relay member; and a second coupling member connected between the relay member and the right and left side clutches.

In some paddy field working machines, rear axle boxes that support right and left rear wheels are provided, and the rear axle boxes are supported by the machine frame so as to be able to swing or are supported by the machine frame via suspension mechanisms.

According to the present invention, when the right and left side clutches are accommodated in the rear axle box, in the coupling mechanism of the side clutch operating portion, the intermediate member of the coupling mechanism is disposed forward of the rear axle box, and the second coupling member of the coupling mechanism extends rearward from the intermediate member and is connected to the right and left side clutches of the rear axle box.

Thus, even if the rear axle box makes a lateral swing motion or a vertical motion by the suspension mechanism, the lateral swing motion and the vertical motion of the rear axle box are smoothly absorbed by swinging the second coupling member of the coupling mechanism about the relay member as a fulcrum.

According to the present invention, the first coupling member of the coupling mechanism is connected between the driving portion and the relay member of the coupling mechanism, whereby the driving portion can be easily disposed at a high position upwardly away from the field surface by the first coupling member of the coupling mechanism.

In the present invention, it is preferable that: and right and left suspension links supported by the body frame so as to be vertically swingable about an axis along the left-right direction, a portion between the axle of the front wheel and the axle of the rear wheel extending rearward from the axis, the rear axle box being supported by a rear portion of the suspension links and supported by the body frame via a suspension spring, and the relay member being disposed between the right and left suspension links in a plan view.

In the paddy field working machine, when the rear axle box is arranged to be supported by the machine frame via the suspension mechanism, the arrangement may be such that: the right and left suspension links extend rearward while being supported vertically swingably at portions between axles of front wheels and axles of rear wheels of the body frame, and the rear axle boxes are supported at rear portions of the suspension links and are supported by the body frame via suspension springs (for example, a five-link type, a three-link type, or the like).

According to the present invention, in the above state, the relay member of the coupling mechanism is disposed between the right and left suspension links in plan view, and therefore, the relay member of the coupling mechanism can be disposed compactly by effectively utilizing the space between the right and left suspension links.

In the present invention, it is preferable that the second link member is disposed 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 coupling mechanism is disposed between the right and left suspension links in a plan view, the second coupling member of the coupling mechanism is disposed along the right and left suspension links in a side view, whereby the second coupling member of the coupling mechanism can be disposed compactly.

In the present invention, it is preferable that the driving unit is disposed at a position rearward of the relay member and higher than the rear axle box.

In a paddy field working machine, a driver seat is sometimes disposed above a rear axle box, and a floor on which a driver stands or sits while putting his feet is sometimes provided in front of the driver seat, and a space may sometimes be created between the rear axle box and the driver seat.

According to the present invention, when a space is formed above the rear axle boxes, the driving unit can be disposed in the space, and therefore, the space formed above the rear axle boxes can be effectively utilized to dispose the driving unit compactly.

In the present invention, it is preferable that the driving section includes an actuator and a reciprocating member reciprocally driven by the actuator, the reciprocating member is reciprocally driven between a neutral position and one side operation position by the actuator, and the reciprocating member is reciprocally driven between the neutral position and the other side operation position by the actuator, and that: the right side coupling mechanism is connected between the reciprocating member and the right side clutch; and the left coupling mechanism connected between the reciprocating member and the left clutch, the right coupling mechanism having a right communicating portion, the right communicating portion being configured to: the right side clutch is operated to a transmission state when the reciprocating member is operated to the neutral position, and the right side clutch is operated to a disconnection state when the reciprocating member is operated to the one side operation position, and the motion of the reciprocating member to the other side operation position is not transmitted to the right side clutch and the right side clutch is maintained in the transmission state even if the reciprocating member is operated to the other side operation position, the left coupling mechanism includes a left fusing portion, and the left fusing portion is configured to: the left side clutch is operated to a transmission state when the reciprocating member is operated to the neutral position, the left side clutch is operated to a cut-off state when the reciprocating member is operated to the other side operation position, and the motion of the reciprocating member to the one side operation position is not transmitted to the left side clutch and the left side clutch is maintained in the transmission state even if the reciprocating member is operated to the one side operation position.

According to the present invention, in the driving section, 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 driving section, when the reciprocating member is reciprocally driven between the neutral position and the one-side operation position by the actuator, the motion of the reciprocating member is transmitted to the right-side clutch via the right-side coupling mechanism, and the right-side clutch is operated to the transmission state and the cut-off state. In this case, the motion of the reciprocating member to the one-side operation position is not transmitted to the left-side clutch through the fusion portion of the left-side coupling mechanism, and the left-side clutch is maintained in the transmission state.

In the driving section, when the reciprocating member is reciprocally driven between the neutral position and the other-side operation position by the actuator, the motion of the reciprocating member is transmitted to the left-side clutch via the left-side coupling mechanism, and the left-side clutch is operated to the transmission state and the cut-off state. In this case, the motion of the reciprocating member to the other-side operation position is not transmitted to the right-side clutch through the through-fusion portion of the right-side coupling mechanism, and the right-side clutch is maintained in the transmission state.

According to the present invention, the state in which the right side clutch is operated to the transmission state and the disengaged state and the state in which the left side clutch is operated to the transmission state and the disengaged state can be obtained by a simple operation of reciprocally driving the reciprocating member between the neutral position and the one side operation position by the actuator and a simple operation of reciprocally driving the reciprocating member between the neutral position and the other side operation position by the actuator, which is advantageous in terms of simplification of the side clutch operation section.

Drawings

Fig. 1 is a left side view of the riding type rice transplanter.

Fig. 2 is a plan view of the riding type rice transplanter.

Fig. 3 is a left side view of the vicinity of the body frame.

Fig. 4 is a plan view of the vicinity of the body frame.

Fig. 5 is an exploded perspective view of the side clutch operating portion.

Fig. 6 is a schematic plan view showing a transmission system for front and rear wheels and a side clutch operating unit.

Fig. 7 is a schematic plan view showing an operation state of the side clutch operation unit.

Fig. 8 is a left side view of the vicinity of the link mechanism in a state where the seedling planting device is operated to be lowered.

Fig. 9 is an exploded perspective view of the vicinity of the link mechanism.

Fig. 10 is a left side view of the vicinity of the link mechanism in a state where the seedling planting device is operated to be raised.

Description of the reference numerals

1: a front wheel;

1 a: an axle;

2: a rear wheel;

2 a: an axle;

22: a rear axle housing;

30: a machine body frame;

41: a suspension link;

42: a suspension link;

47: a suspension spring;

50: a side clutch operating part;

51: a side clutch;

52: a side clutch;

54: a drive section;

55: a coupling mechanism;

56: a coupling mechanism;

60: a relay member;

61: a first coupling member;

62: a second coupling member;

62 b: a melt-through portion;

64: an electric motor (actuator);

58: an operating gear (reciprocating member);

68: a steering angle sensor (steering angle detection unit);

70: a relay member;

71: a first coupling member;

72: a second coupling member;

72 b: a melt-through portion;

a1: a neutral position;

a2: a one-sided operating position;

a3: the other side operating position;

n: a straight-going position;

r1: setting an angle;

l1: setting an angle;

p3: an axis;

p4: an axis.

Detailed Description

Fig. 1 to 10 show a ten-row rice transplanter of a rice transplanter type. In fig. 1 to 10, F denotes a front direction, B denotes a rear direction, U denotes an upper direction, D denotes a lower direction, R denotes a right direction, and L denotes a left direction.

(riding type transplanter Integrated Structure)

As shown in fig. 1 and 2, the riding type rice transplanter includes a link mechanism 3 and a hydraulic cylinder 4 for lifting and lowering the link mechanism 3 at the rear part of a machine body frame 30 having right and left front wheels 1 and right and left rear wheels 2, and a rice seedling planting device 5 is supported at the rear part of the link mechanism 3, and the rice seedling planting device 5 is supported at the rear part of the machine body frame 30 so as to be able to be lifted and lowered. In addition to the seedling planting device 5, the riding type rice transplanter is provided with a soil preparation device 11, a fertilizer application device 12, and a chemical distribution device 28.

(Structure of seedling transplanting device)

As shown in fig. 1 and 2, in the seedling planting device 5, there are provided: five transplanting transmission boxes 6 arranged at a predetermined interval in the left-right direction, a rotating box 7 rotatably supported at the right and left parts of the transplanting transmission boxes 6, transplanting arms 8 supported at both ends of the rotating box 7, five floating plates 9, a seedling stage 10, and the like.

In the seedling transplanting apparatus 5, the rotation box 7 is rotationally driven while the seedling stage 10 is laterally feed-driven, and the transplanting arm 8 takes out a seedling from the lower portion of the seedling stage 10 and transplants it onto the field surface.

(Structure of soil preparation device)

As shown in fig. 1 and 8, a soil preparation device 11 for preparing the soil is supported at a lower portion of a front portion of the seedling planting device 5, and the soil preparation device 11 is provided with a drive shaft 11a supported to be rotatable about an axial center P1 in the left-right direction and a plurality of soil preparation bodies 11b attached to the drive shaft 11 a. The driving shaft 11a of the soil preparation device 11 is rotationally driven in the counterclockwise direction of fig. 8, and soil preparation of the field is performed by the soil preparation body 11b of the soil preparation device 11.

(construction of fertilizing apparatus and chemical spreading apparatus)

As shown in fig. 1 and 2, a fertilizer application device 12 is supported between the rear portion of the body frame 30 and the seedling planting device 5, and the fertilizer application device 12 is provided with a hopper 13, a delivery portion 14, a blower 15, a furrow opener 16, a hose 17, and the like.

In the fertilizer application device 12, a hopper 13 for storing fertilizer and a delivery unit 14 are provided at an upper portion of a rear portion of a body frame 30, and a blower 15 is provided laterally outside a left side of the delivery unit 14. A furrow opener 16 is attached to the floating plate 9, and a hose 17 is connected between the delivery portion 14 and the furrow opener 16.

In the fertilizer application device 12, fertilizer in the hopper 13 is fed out by the feeding portion 14, and is supplied to the furrow opener 16 through the hose 17 by the air blown by the blower 15, and while forming a furrow in the field by the furrow opener 16, the fertilizer is supplied from the furrow opener 16 to the furrow in the field.

The drug dispenser 28 is supported by a support frame 29 connected to the central implant gear box 6. The chemical such as herbicide is spread from the chemical spreading device 28 to the field surface behind the seedling planting device 5.

(Transmission systems for front and rear wheels)

As shown in fig. 1, 3, and 4, the right and left rectangular-pipe-shaped body frames 30 are arranged along the front-rear direction, and the transmission case 18 is coupled to the front portion of the body frames 30. A support frame 19 is coupled to a front portion of the transmission 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 portions of the transmission case 18, and the right and left front wheels 1 are rotatably supported by the front wheel support case 21. The rear axle box 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 box 22.

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

As shown in fig. 3, 4, and 6, an output shaft 25 is supported rearward at the rear of the transmission case 18. The power branched from the subtransmission is transmitted from the output shaft 25 to the input shaft 31 of the rear axle box 22 via the universal joint 26 and the propeller shaft 27, and is transmitted to the right and left rear wheels 2 as described later (in the transmission system of the rear axle box).

(Structure of steering operation of front wheel)

As shown in fig. 1 and 2, the operating handle 32 is provided at the front portion of the body frame 30, the shift lever 37 is provided at the left lateral portion of the operating handle 32, and the continuously variable transmission 23 is continuously operated to the neutral stop position, the forward side, and the reverse side by the shift lever 37.

Right and left vertical wall-shaped support members 38 are provided at the rear of the right and left body frames 30, and the operator seat 33 and the hopper 13 and the delivery portion 14 of the fertilizer application device 12 (see the above-described (structure of the fertilizer application device and the chemical application device)) are supported by the upper portions of the support members 38. A floor 34 on which an operator places his feet while standing or sitting on the driver seat 33 is provided at a lower position between the manipulation handle 32 and the driver seat 33.

As shown in fig. 6, the steering member 35 operated by the steering handle 32 is supported at the lower portion of the transmission case 18 so as to be swingable about an axial center P2 along the vertical direction, and tie rods 36 are connected between the steering member 35 and the right and left front wheels 1. By operating the steering handle 32, the steering member 35 is steered between the right steering limit R2 and the left steering limit L2 from the straight position N, and the steering handle 32 steers the front wheels 1.

(supporting structure of rear axle case)

As shown in fig. 3 and 4, right and left upper suspension links 41, right and left lower suspension links 42, and a transverse link 43 are provided.

In the right and left body frames 30, right and left brackets 39 are connected to portions between axles 1a (see fig. 6) of the front wheels 1 and axles 2a (see fig. 6) of the rear wheels 2 in a side view. The right and left upper suspension links 41 are supported by the bracket 39 so as to be vertically swingable about an axis P3 along the left-right direction, and extend rearward from the axis P3.

In side view, a bracket 40 is coupled to a portion of the right and left body frames 30 between the axle 1a (see fig. 6) of the front wheel 1 and the axle 2a (see fig. 6) of the rear wheel 2, and the bracket 40 is disposed in front of the bracket 39. The bracket 40 is also coupled to the transmission case 18, and right and left side frames 65 are coupled to rear portions of right and left portions of the bracket 40 and right and left body frames 30. The right and left lower 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 coupled to right and left portions of the front portion of the rear axle boxes 22. The rear portions of the right and left upper suspension links 41 are swingably supported on the upper portions of the right and left support brackets 44. The rear portions of the right and left lower suspension links 42 are swingably supported by the lower portions of the right and left support brackets 44.

The transverse link 43 is disposed rearward of the rear axle boxes 22, and the transverse link 43 is swingably connected between the rear portion of the left body frame 30 and the right portion of the rear axle boxes 22.

Right and left support brackets 45 are coupled to right and left portions of a front portion of the rear axle box 22, and spring receiving portions 46 are coupled to rear portions of the right and left body frames 30. Right and left suspension springs 47 are fitted between the support bracket 45 and the spring seat 46, and the rear axle box 22 is supported by the body frame 30 via the suspension springs 47.

As described above, the five-link type suspension mechanism is constituted by the right and left upper suspension links 41, the right and left lower suspension links 42, the transverse link 43, and the right and left suspension springs 47.

(Transmission system of rear axle box)

As shown in fig. 6, the propeller shaft 48 is supported in the right-left direction inside the rear axle box 22, and a bevel gear 48a coupled to the propeller shaft 48 meshes with a bevel gear 31a coupled to the input shaft 31.

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

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

(outline of operation System of side clutches on the Right and left sides)

As shown in fig. 5, 6, and 7, a side clutch operating unit 50 is provided to operate the right and left side clutches 51 and 52 to a transmission state and a cut-off state. The side clutch operating unit 50 includes a driving unit 54, a right coupling mechanism 55, and a left coupling mechanism 56.

The right coupling mechanism 55 is connected between the driving portion 54 and the right side clutch 51 to transmit the operation of the driving portion 54 to the right side clutch 51 and to operate the right side clutch 51 to the transmission state and the disconnection state.

The left coupling mechanism 56 is connected between the driving portion 54 and the left side clutch 52 to transmit the motion of the driving portion 54 to the left side clutch 52 and operate the left side clutch 51 to the transmission state and the disconnection state.

(Structure of drive part in side Clutch operating part)

As shown in fig. 3 and 4, a support frame 53 is connected to the rear portion of the left body frame 30, and the driving unit 54 is supported by the support frame 53.

As shown in fig. 3 to 7, the support member 57 is coupled to the support frame 53. A fan-shaped operation gear 58 (corresponding to a reciprocating member) is supported by the support member 57 so as to be capable of reciprocating about an axial center P5 along the left-right direction, and an angle sensor 59 for detecting an operation angle of the operation gear 58 is attached to the support member 57.

A gear mechanism 63 having a pinion gear 63a is fitted 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 operating gear 58 is reciprocally driven about the axis P5 by the electric motor 64 via the gear mechanism 63.

Thus, the driving unit 54 is disposed at a position rearward of the right and left relay members 60 and 70 described later (the right and left coupling mechanisms in the side clutch operating unit) and higher than the rear axle boxes 22. The drive unit 54 is disposed in a space between the rear axle boxes 22 and the driver seat 33 in a side view, and in a space between the right and left support members 38 (see fig. 1) in a top view.

(construction of coupling mechanism for right and left sides in side clutch operating part)

As shown in fig. 5, 6, and 7, the right-side coupling mechanism 55 includes a right-side relay member 60, a right-side first coupling member 61, and a right-side second coupling member 62. The left-side coupling mechanism 56 has a left-side relay member 70, a left-side first coupling member 71, and a left-side second coupling member 72.

As shown in fig. 3, 4, and 5, right and left brackets 66 are coupled to front portions of the right and left frames 65, and a relay shaft 67 is supported by 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 swingable independently of each other about an axial center P6 along the left-right direction.

Thus, the right and left relay members 60 and 70 are disposed between the axle 1a (see fig. 6) of the front wheel 1 and the axle 2a (see fig. 6) of the rear wheel 2 in side view, between the right and left suspension links 41 and 42 in top view, and between the right and left body frames 30.

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

The right first coupling member 61 is connected between the operating gear 58 of the driving portion 54 and the arm 60b of the right relay member 60. The first coupling member 71 on the left side is connected between the operating gear 58 of the driving portion 54 and the arm 70b of the relay member 70 on the left side.

As shown in fig. 3, 4, 5, and 7, the right-side operating portion 73 and the left-side operating portion 74, which can operate the right-side and left- side clutches 51 and 52 to the transmission state and the disconnection state, are supported by the rear axle box 22 so as to be swingable about an axial center P7 extending in the vertical direction.

The front portion of the right second coupling member 62 is connected to the arm 60c of the right relay member 60, a connection portion 62a is connected to the rear portion of the right second coupling member 62, and a long hole-shaped connection hole 62b (corresponding to the right fusion portion) is opened in the connection portion 62 a. An arm 73a is coupled to the right-hand operation portion 73, a pin 73b coupled to the arm 73a is inserted into the coupling hole 62b of the right-hand second coupling member 62, and the right-hand second coupling member 62 is coupled to the right-hand side clutch 51 via the right-hand operation portion 73.

The front portion of the left second coupling member 72 is connected to the arm 70c of the left relay member 70, a connection portion 72a is connected to the rear portion of the left second coupling member 72, and a long hole-shaped connection hole 72b (corresponding to the left communicating portion) is opened in the connection portion 72 a. An arm 74a is coupled to the left operating portion 74, a pin 74b coupled to the arm 74a is inserted into the coupling hole 72b of the left second coupling member 72, and the left second coupling member 72 is coupled to the left side clutch 52 via the left operating portion 74.

Thus, as shown in fig. 3 and 4, the right and left first coupling members 61 and 71 are disposed so as to extend obliquely rearward and upward from the right and left relay members 60 and 70 in side view, and are disposed so as to intersect the propeller shaft 27, the right and left body frames 30, and the right and left upper suspension links 41 in side view.

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

The right and left second link members 62 and 72 are disposed along the right and left lower suspension links 42 in a side view, and are disposed on the lower side with respect to the right and left lower suspension links 42. The right and left second link members 62 and 72 are disposed so as to intersect the right and left lower suspension links 42 in plan view, and are disposed so as to intersect the right and left body frames 30 in plan view.

(construction of control System)

As shown in fig. 6 and 7, a steering angle sensor 68 (corresponding to a steering angle detecting unit) is supported by the frame 65 (see fig. 3 and 4), and the steering angle sensor 68 is disposed between the transmission case 18 and the right and left relay members 60 and 70 in a plan view and a side view.

A coupling rod 69 is connected between the steering member 35 and the steering angle sensor 68, and the steering angle sensor 68 is capable of detecting the steering angle (orientation) of the front wheels 1 via the steering member 35 and the coupling rod 69. The control device 80 is supported by the body 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 actuates the electric motor 64 of the side clutch operating unit 50 (the driving unit 54) as described later (the operating state of the side clutch operating unit in the straight state) (the operating state of the side clutch operating unit in the right-turn state) (the operating state of the side clutch operating unit in the left-turn state) based on the detection value of the steering angle sensor 68 and the detection value of the angle sensor 59, and operates the operating gear 58 to the neutral position a1, the one-side operating position a2, and the other-side operating position A3 by the electric motor 64.

(operating state of side clutch operating part in straight traveling state)

As shown in fig. 6 and 7, a right set angle R1 is set between the straight position N and the right steering limit R2 with respect to the steering angle (orientation) of the front wheels 1. A left set angle L1 is set between the straight position N and the left steering limit L2, and the right set angle R1 and the left set angle L1 are the same value.

When the steering angle (orientation) of the front wheels 1 is within a range from the straight position N to the set angle R1 on the right side and a range from the straight position N to the set angle L1 on the left side, the riding type rice transplanter is in a substantially straight state. 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 operating gear 58 is operated to the neutral position a1, the right and left operating portions 73, 74 are operated to the transmission position ON, and the right and left side clutches 51, 52 are operated to the transmission state. In this state, the pins 73b, 74b of the right and left operation parts 73, 74 are located at the rear end portions of the connection holes 62b, 72b of the right and left second coupling members 62, 72.

(operating state of side clutch operating part in Right-hand rotation state)

As shown in fig. 6 and 7, when the front wheel 1 is steered rightward beyond the right set angle R1 (when the steering angle (direction) of the front wheel 1 is within the range between the right set angle R1 and the right steering limit R2), the riding rice transplanter is in a right-turn state. In this state, the operating gear 58 is reciprocally driven by the electric motor 64 between the neutral position a1 and the one-side operating position a 2.

When the operating gear 58 is operated from the neutral position a1 to the one-side operating position a2, the right-side first coupling member 61 is pulled toward the operating gear 58 (see direction B11), the right-side relay member 60 swings counterclockwise in fig. 7, and the right-side second coupling member 62 is pulled toward the right-side relay member 60 (see direction B11). The right operation portion 73 is operated to the disengaged position OFF and the right side clutch 51 is operated to the disengaged state via the connecting portion 62a of the right second coupling member 62.

When the operating gear 58 is operated from the one-side operating position a2 to the neutral position a1, the right-side first coupling member 61 is pushed to operate the right-side relay member 60 (see direction B12), the right-side relay member 60 swings clockwise in fig. 7, and the right-side second coupling member 62 is pushed to operate the right-side operating portion 73 (see direction B12). The right side clutch 51 is biased to the transmission state (see the above (transmission system of the rear axle box)), whereby the right side operation unit 73 is operated to the transmission position ON and the right side clutch 51 is operated to the transmission state.

When the operating gear 58 is operated from the neutral position a1 to the one-side operating position a2, the left-side first coupling member 71 is pushed to operate the left-side relay member 70 (see direction B22), the left-side relay member 70 swings counterclockwise in fig. 7, and the left-side second coupling member 72 is pushed to operate the left-side operating portion 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-side first coupling member 71 is pulled toward the operating gear 58 (see direction B21), the left-side relay member 70 swings clockwise in fig. 7, and the left-side second coupling member 72 is pulled toward the left-side relay member 70 (see direction B21).

In this case, the movement of the operation gear 58 from the neutral position a1 to the one-side operation position a2 is not transmitted to the left-side operation unit 74 (left-side clutch 52) by the fusion of the connection hole 72b of the left-side second coupling member 72, and the connection portion 72a of the left-side second coupling member 72 reciprocates between the position shown by the solid line and the position shown by the broken line in fig. 7 with respect to the left-side operation unit 74.

Accordingly, the left operating unit 74 is not operated to the blocking position OFF, and the left side clutch 52 is biased to the transmission state (see the above (rear axle box transmission system)), so that the left side clutch 52 is maintained in the transmission state, and the left operating unit 74 is maintained at the transmission position ON.

As described above, the operation gear 58 is reciprocally driven between the neutral position a1 and the one-side operation position a2 by the electric motor 64, whereby the left-side clutch 52 is operated (maintained) in the transmission state and the right-side clutch 51 is alternately repeatedly operated in the transmission state and the cut-off state.

(operating state of side clutch operating part in left-turn state)

As shown in fig. 6 and 7, when the front wheels 1 are steered to the left beyond the left set angle L1 (when the steering angle (orientation) of the front wheels 1 is within the range between the left set angle L1 and the left steering limit L2), the riding type rice transplanter is in the left-turn state. In this state, the operating gear 58 is reciprocally driven by the electric motor 64 between the neutral position a1 and the other-side operating position A3.

When the operating gear 58 is operated from the neutral position a1 to the other-side operating position A3, the left-side first coupling member 71 is pulled toward the operating gear 58 (see direction B21), the left-side relay member 70 swings clockwise in fig. 7, and the left-side second coupling member 72 is pulled toward the right-side relay member 70 (see direction B21). The left operating portion 74 is operated to the disengaged position OFF and the left side clutch 52 is operated to the disengaged state via the connecting portion 72a of the left second coupling member 72.

When the operating gear 58 is operated from the other-side operating position A3 to the neutral position a1, the left-side first coupling member 71 is pushed to operate the left-side relay member 70 (see direction B22), the left-side relay member 70 swings counterclockwise in fig. 7, and the left-side second coupling member 72 is pushed to operate the left-side operating portion 74 (see direction B22). The left side clutch 52 is biased to the transmission state (see the above (transmission system of the rear axle box)), whereby the left side operating portion 74 is operated to the transmission position ON and the left side clutch 52 is operated to the transmission state.

When the operating gear 58 is operated from the neutral position a1 to the other-side operating position A3, the right-side first coupling member 61 is pushed to operate the right-side relay member 60 (see direction B12), the right-side relay member 60 swings clockwise in fig. 7, and the right-side second coupling member 62 is pushed to operate the right-side operating portion 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-side first coupling member 61 is pulled toward the operating gear 58 (see direction B11), the right-side relay member 60 swings counterclockwise in fig. 7, and the right-side second coupling member 62 is pulled toward the right-side relay member 60 (see direction B11).

In this case, the movement of the operation gear 58 from the neutral position a1 to the other operation position A3 is not transmitted to the right operation portion 73 (right side clutch 51) by the fusion of the connection hole 62b of the right second coupling member 62, and the connection portion 62a of the right second coupling member 62 reciprocates between the position shown by the solid line and the position shown by the broken line in fig. 7 with respect to the right operation portion 73.

Thus, the right-side operation unit 73 is not operated to the OFF position, and the right-side clutch 51 is biased to the transmission state (see the above (transmission system of the rear axle box)), so that the right-side clutch 51 is maintained in the transmission state, and the right-side operation unit 73 is maintained at the transmission position ON.

As described above, the operation gear 58 is reciprocally driven between the neutral position a1 and the other-side operation position A3 by the electric motor 64, and the right-side clutch 51 is operated (maintained) in the transmission state while the left-side clutch 52 is alternately repeatedly operated in the transmission state and the cut-off state.

(Transmission system of land preparation device)

As shown in fig. 6, the output shaft 75 is supported rearward inside the rear axle box 22, a bevel gear 75a connected to the output shaft 75 meshes with a bevel gear 48a of the propeller shaft 48, and a land clutch 76 is provided on the output shaft 75.

As shown in fig. 3, 4, and 6, the output tank 77 is connected to the rear portion of the rear axle boxes 22 so as to face rearward, and the output tank 78 is supported by the output tank 77 so as to be vertically swingable about an axial center P8 extending in the left-right direction.

The power of the land clutch 76 is transmitted to a rearward output shaft 79 of the output case 78 via a bevel gear mechanism (not shown) inside the output case 77, a transmission shaft (not shown) disposed concentrically with the shaft center P8 in the output cases 77 and 78, and a bevel gear mechanism (not shown) inside the output case 78.

As shown in fig. 8 and 9, in soil preparation device 11, drive boxes 81 are attached to the right and left center portions of drive shaft 11a of soil preparation device 11 via bearings (not shown). The input shaft 82 is supported by the drive case 81 so as to face forward, and inside the drive case 81, a bevel gear (not shown) coupled to the input shaft 82 meshes with a bevel gear (not shown) coupled to the drive shaft 11a of the land preparation device 11. A telescopic propeller shaft 83 is connected between the output shaft 79 and the input shaft 82 via a universal joint 84.

With the above configuration, the power of the propeller shaft 48 is transmitted to the input shaft 82 via the output shaft 75, the land preparation clutch 76, the output shaft 79, and the propeller shaft 83, and the drive shaft 11a of the land preparation device 11 is rotationally driven in the counterclockwise direction in fig. 8.

(operating System of Whole ground Clutch)

As shown in fig. 4, 8 and 9, the link mechanism 3 has upper links 3a on right and left sides, lower links 3b on right and left sides, and a longitudinal link 3c connected to rear portions of the upper and lower links 3a and 3b, and the seedling planting device 5 is supported by the longitudinal link 3 c. A connecting member 85 having a groove shape in a plan view is connected to a rear end portion 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 fig. 4 and 8, an operating arm 86 for operating the ground clutch 76 to a transmission state and a cut-off state is provided, and a coupling link 87 is connected between the upper link 3a of the link mechanism 3 and the operating arm 86.

As shown in fig. 8 and 9, an operating member 88 is coupled to the output case 78, and a coupling rod 89 is connected between the lower link 3b of the link mechanism 3 and the operating member 88. An operation member 90 is connected to the drive case 81, and a coupling rod 91 is connected between the coupling member 85 and the operation member 90.

The state shown in fig. 1 and 8 is a state where the seedling planting device 5 is lowered by the link mechanism 3 and the hydraulic cylinder 4. In this state, the coupling lever 87 is operated to descend, and the land preparation clutch 76 is operated to the transmission state by the operating arm 86.

In the state where the seedling planting device 5 is operated to descend, the coupling lever 89 is operated to descend, and the output box 78 and the output shaft 79 are directed obliquely downward. The coupling lever 91 is operated to be raised, and the driving case 81 and the input shaft 82 are directed horizontally or obliquely upward. Thereby, bending at the universal joint 84 is suppressed to be small, and the power of the output shaft 79 is smoothly transmitted to the input shaft 82 via the propeller shaft 83 and the universal joint 84.

The state shown in fig. 10 is a state where the seedling planting device 5 is subjected to the raising operation by the link mechanism 3 and the hydraulic cylinder 4. In this state, the coupling lever 87 is operated to be raised, the land preparation clutch 76 is operated to be in the off state by the operating arm 86, and the land preparation device 11 is stopped.

In the state where the seedling planting device 5 is operated to be raised, the coupling lever 89 is operated to be raised, and the output box 78 and the output shaft 79 are directed obliquely upward. The coupling lever 91 is lowered, and the drive case 81 and the input shaft 82 are directed obliquely downward. Thereby, bending at the gimbal 84 is suppressed to be small.

(first other embodiment of the invention)

Instead of the five-link suspension mechanism, a three-link suspension mechanism having right and left suspension links and a transverse link may be employed.

The rear axle boxes 22 may be supported by the body frame 30 so as to be able to laterally swing about the axial center in the front-rear direction without a suspension mechanism, or the rear axle boxes 22 may be connected to the body frame 30 so as to be unable to move up and down and able to laterally swing.

(second other embodiment of the invention)

The right communicating portion may be provided at a connecting portion between the operation gear 58 and the right first coupling member 61, a connecting portion between the right first coupling member 61 and the right relay member 60, and a connecting portion between the right second coupling member 62 and the right relay member 60.

The left communicating portion may be provided at a connection portion between the operation gear 58 and the left first coupling member 71, a connection portion between the left first coupling member 71 and the left relay member 70, and a connection portion between the left second coupling member 72 and the left relay member 70.

(third other embodiment of the invention)

In the side clutch operating unit 50, the right and left driving units 54 may be directly attached to the rear axle boxes 22. According to this configuration, the right coupling mechanism 55 connected between the right driving unit 54 and the right side clutch 51 is attached to the rear axle box 22, and the left coupling mechanism 56 connected between the left driving unit 54 and the left side clutch 52 is attached to the rear axle box 22.

According to this configuration, the right and left side clutches 51, 52 are operated to the transmission state and the disconnection state independently of each other, and therefore, the communicating portion is not required.

Industrial applicability

The present invention can be applied not only to a riding type rice transplanter but also to a riding type direct seeder for supplying seeds to the field and a riding type management machine for supplying chemicals to the field.

Claims (7)

1. A paddy field working machine is characterized by comprising:

right and left front wheels capable of being steered and driven to rotate;

right and left rear wheels;

a right side clutch capable of transmitting and cutting off power to the right rear wheel;

a left side clutch capable of transmitting and cutting off power to the left rear wheel;

a steering angle detection unit that detects the direction of the front wheel; and

a side clutch operating section capable of operating the right and left side clutches to a transmission state and a cut-off state based on detection by the steering angle detecting section,

the side clutch operating part operates the right and left side clutches to a transmission state when the front wheel is located within a range of a set angle from a straight traveling position to the right and left sides,

the side clutch operating section operates the left side clutch to a transmission state and repeatedly operates the right side clutch to a transmission state and a cut-off state alternately when the front wheel is steered to the right over the right set angle,

when the front wheel is steered to the left over the set angle of the left side, the side clutch operating unit operates the right side clutch to a transmission state and repeatedly operates the left side clutch to the transmission state and a cut-off state alternately.

2. The paddy field working machine according to claim 1,

the side clutch operation unit includes: a drive section; and a coupling mechanism that transmits the motion of the driving portion to the right and left side clutches, and operates the right and left side clutches to a transmission state and a cut-off state.

3. The paddy field working machine according to claim 2,

the disclosed device is provided with: a rear axle box supporting the right and left rear wheels and accommodating the right and left side clutches,

the coupling mechanism has: a relay member disposed between the axle of the front wheel and the axle of the rear wheel in a side view; a first coupling member connected between the driving part and the relay member; and a second coupling member connected between the relay member and the right and left side clutches.

4. The paddy field working machine as claimed in claim 3,

the disclosed device is provided with: right and left suspension links supported by a portion of the body frame between the axle of the front wheel and the axle of the rear wheel in a side view so as to be vertically swingable around an axis along the left-right direction, extending rearward from the axis,

the rear axle box is supported by the rear portion of the suspension link and by the body frame via a suspension spring,

the relay member is disposed between the right and left suspension links in a plan view.

5. The paddy field working machine as claimed in claim 4,

the second link member is disposed along the right and left suspension links in side view.

6. A paddy field working machine as claimed in any one of claims 3 to 5,

the drive unit is disposed at a position rearward of the relay member and higher than the rear axle box.

7. The paddy field working machine according to any one of claims 2 to 6,

the driving section has an actuator and a reciprocating member reciprocally driven by the actuator, the reciprocating member is reciprocally driven between a neutral position and one side operation position by the actuator, the reciprocating member is reciprocally driven between the neutral position and the other side operation position by the actuator,

is provided with: the right side coupling mechanism is connected between the reciprocating member and the right side clutch; and the left side coupling mechanism connected between the reciprocating member and the left side clutch,

the right coupling mechanism has a right communicating portion, and the right communicating portion is configured to: the right side clutch is operated to a transmission state when the reciprocating member is operated to the neutral position, the right side clutch is operated to a cut-off state when the reciprocating member is operated to the one side operation position, and the motion of the reciprocating member to the other side operation position is not transmitted to the right side clutch and the right side clutch is maintained in the transmission state even if the reciprocating member is operated to the other side operation position,

the left coupling mechanism has a left communicating portion, and the left communicating portion is configured to: the left side clutch is operated to a transmission state when the reciprocating member is operated to the neutral position, the left side clutch is operated to a cut-off state when the reciprocating member is operated to the other side operation position, and the motion of the reciprocating member to the one side operation position is not transmitted to the left side clutch and the left side clutch is maintained in the transmission state even if the reciprocating member is operated to the one side operation position.

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