JP2585279Y2 - Clutch mechanism for paddy field work vehicle - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paddy field working vehicle such as a rice transplanter and, more particularly, to a clutch mechanism for a paddy field working vehicle in which a clutch body is connected and disconnected by a clutch pedal arranged in a driver's seat.

[0002]

2. Description of the Related Art Generally, in a riding rice transplanter, an engine is mounted on a front end portion of the body in the left-right direction, and a transmission case accommodating a clutch main body is disposed diagonally below and behind the engine. When viewed from the driver's seat, the transmission case is located below a step at the driver's feet when the driver takes a sitting posture, that is, just below a steering column that supports a steering wheel at the front center. In the case where the continuously variable transmission is loaded, the main components such as the pulley and the belt are arranged on the left side of the engine and the transmission case. ing.

The continuously variable transmission arranged on the left side of the transmission case swings an upwardly extending operation lever on the left side of the steering column, for example, with the left hand in the front-rear direction, thereby switching between the low-speed side and the high-speed side. Shifts continuously. In addition, on the right side of the driver's seat, there are disposed a forward / backward speed change lever operated by the right hand, an operation lever for seedling planting work, and the like.

[0004] On the other hand, a brake pedal is arranged on the right step with the base end of the steering column interposed therebetween, and a clutch pedal is arranged on the left step. This clutch pedal is connected to the clutch body in the transmission case via a connection rod or the like disposed on the left side of the transmission case, and by depressing the clutch pedal with the left foot, the clutch body is disconnected,
The power for running and the power for planting work are cut off.

[0005]

However, according to the above-mentioned prior art, however, the clutch pedal operated by the left foot,
Since the connecting rod and the like interposed between the clutch body in the central transmission case are disposed on the left side of the transmission case, they are also disposed on the left side of the transmission case and include a large number of movable parts. In addition, there is a problem that the maintainability of the continuously variable transmission that requires inspection and maintenance is poor.

Accordingly, the present invention provides a clutch bar which extends long in the left-right direction of the body, and connects the clutch pedal and the connecting rod to the left end and the right end, respectively, by distributing the clutch pedal and the connecting rod left and right to the transmission case. Accordingly, it is an object of the present invention to provide a clutch mechanism in a paddy working vehicle in which maintainability of the continuously variable transmission is improved.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is directed to a paddy field working vehicle (P) having a clutch body (42) disposed in a transmission case (3). A clutch bar (95) extending in the left-right direction and rotatably supported;
A clutch pedal (96) integrally connected to the clutch bar (95) and rotating the clutch bar (95);
A connection rod (92) interposed between the clutch body (42) and the clutch body (42) and operating the clutch body (42) by rotation of the clutch bar (95); The bar (95) is connected to the traveling body (1).
9) It is arranged below the step (97) of the driver's seat (4), and a connecting portion between the clutch bar (95) and the clutch pedal (96) and the clutch bar (95) and the connecting rod (92). ) Is divided on the left and right sides with respect to the mission case (3).

In this case, the clutch bar (95) is
A horizontal frame (19c) connecting the left frame (19a) and the right frame (19b) of the traveling body (19).
And the left frame (19)
It is preferable that the supporting member is rotatably supported by a) and the right frame (19b).

[0009]

[Operation] Based on the above configuration, the mission case (3)
When the clutch pedal (96) arranged on one side of the transmission is depressed, the clutch bar (95) rotates, and the connecting rod (92) arranged on the other side of the transmission case (3) moves in the longitudinal direction. Moving. Thereby, for example, the arm (8
9) and the like, the clutch body (42) in the transmission case (3) operates.

[0010] The left and right frames (19a, 19b) rotatably supporting the clutch bar (95) are reinforced by a horizontal frame (19c), and the vicinity of a connection portion with the horizontal frame (19c). , The left and right ends of the clutch bar (95) are rotatably supported.
Thereby, the strength of the support portion of the clutch bar (19c) in the left and right frames (19a, 19b) can be sufficiently ensured.

[0011]

[Effect of the Invention] As described above, the traveling body (19)
A connecting rod (9) for operating the clutch body (42) via a clutch bar (19c) extending long in the left-right direction of
By disposing the clutch case (2) and the clutch pedal (96) separately on the left and right sides of the transmission case (3), for example, the continuously variable transmission (2) and the connecting rod (92) are sandwiched between the transmission case (3). ) Can be arranged on the left and right opposite sides, so that the workability for maintenance of the continuously variable transmission can be remarkably improved.

Further, the left and right frames (19a, 19a)
b) supports the clutch bar (95) rotatably in a high strength portion near the connection portion with the horizontal frame (19c), so that when the clutch pedal (96) is operated, the left and right sides are actuated. Frame (19a, 19
By preventing harmful deformation from occurring in b), the disconnection / connection operation of the clutch body (42) can be ensured.

The reference numerals in parentheses are for comparison with the drawings, but do not limit the configuration of the present invention.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to the drawings.

As shown in FIG. 4 to FIG. 6, the riding rice transplanter P includes an engine 1, a transmission case 3, and a frame 1.
A rice transplanter 21 is supported at the rear of the fuselage 19 via an elevating link 20. A planter 22 is attached to a lower part of the rice transplanter 21 and a floater is mounted on the lower part of the rice transplanter 21. 23 are attached.
Further, the transmission case 3 has lateral axle housings 25a, 25b projecting from both sides, and the vertical axle housings 26a, 26b are fixed to the horizontal axle housings 25a, 25b so as to face downward (a little diagonally outward). ing. And, this vertical axle housing 26a, 2
6b can be elastically expanded and contracted, and the front wheels 27, 2
7 is supported. A drive shaft 29 extends rearward from the lower rear end of the transmission case 3 along the lower surface of the frame 17, and the drive shaft 29 is connected to the rear axle housing 30. Rear transmissions 31a and 31b are provided at both ends of the rear axle housing 30, and rear wheels 32 and 32 composed of paddy wheels are supported by the rear transmissions 31a and 31b. The rear axle housing 3
A clutch and a brake are provided in 0, and power is disconnected and connected to the rear wheels 32, 32 independently of left and right, and a brake is applied. A PTO shaft 33 extends rearward from the upper rear end of the transmission case 3, and is connected via a propeller shaft 35 to the planter 2.
Transmission device G in transmission case 3 for 2 etc. (see FIG. 1)
Is transmitted.

Next, as shown in FIG.
The transmission case 3 will be described. The transmission case 3 is divided into two parts substantially at the center and is assembled integrally with bolts and nuts. The left end of the main shaft A protrudes outside the transmission case 3, and a driven pulley 9 is attached. A collar 36 is provided at an intermediate portion of the main shaft A, and a sleeve 3 is provided between the collar 36 and the left bearing.
7 is stopped from moving in the axial direction, and is supported by the main shaft A. The shift gear 39 and the gear 40 are integrally provided on the sleeve 37. A clutch case 41 is mounted on the right side of the main shaft A via a spline or the like so as to be movable in the axial direction. A main clutch 42 is formed between the clutch case 41 and the sleeve 37.

The main clutch 42 will be described in more detail. A plurality of disc springs 72 are laminated on the bottom of the clutch case 41, and a holding plate 73 is provided in contact with the left side of the disc spring 72. The inner peripheral edge of the holding plate 73 comes into contact with the collar 36. A separator plate 75 is slidably mounted in the clutch case 41 in the axial direction. A clutch plate 76 sandwiched between the separator plates 75 is slidably mounted in the sleeve 37 in the axial direction. Note that the sleeve 37 is divided into two parts by a joint part 37a to facilitate assembly, and the joint part 37a is configured such that square-shaped concave and convex pieces are fitted to each other. Further, a stopper plate 77 is provided outside the separator plate 75, and the stopper plate 77 is stopped by the clutch case 41 by the retaining ring 79, so that the plates 75 and 76 do not escape from the clutch case 41. .

The bearing 80 is provided in the clutch case 4
The inner race of the bearing 80 is attached to the eccentric piece 81. The eccentric portion 81 is eccentrically attached to the clutch operation shaft 82 as shown in FIGS. 7 and 8, and the intermediate portion of the shaft 82 is rotatably supported by a support portion 83 in the transmission case 3 and The distal end portion 82a projecting from above the transmission case 3 is formed in a prismatic shape such as a hexagon. A boss 89a formed at one end of the arm 89 is fitted to the distal end 82a, and is fixed by a bolt 90 having a lock nut 90a. A pin 89b is protruded from the other end of the arm 89, and the pin 89
A nut member 91a is rotatably mounted on b, and one end of a connecting rod 92 is screwed into the nut member 91a. The other end of the connecting rod 92 is screwed into another nut member 91b, and one end of the connecting rod 92 is formed into a reverse thread so that the connecting rod 92
By turning, the distance between the two nut members 91a and 91b can be adjusted. The nut member 91b is rotatably supported by an arm 93 via a pin portion 91c. The arm 93 is positioned and fixed to the right end side (right side in FIG. 7) of a clutch bar 95 whose collar portion 93a extends in the left-right direction of the body 19. Have been.

The left and right ends of the clutch bar 95 are rotatably supported by a left frame 19a and a right frame 19b of the fuselage 19.
It is arranged substantially parallel to and adjacent to the horizontal frame 19c connecting the 19b. A base end portion 96a of a clutch pedal 96 having an intermediate portion bent is fixedly positioned outside the left frame 19a at the left end portion of the clutch bar 95. The clutch pedal 96 is constantly applied with a clockwise force around the clutch bar 95 by an urging member (not shown).
The position of the upper limit is determined by step 9 at the foot of the driver's seat 4.
7 is regulated by a stopper 99 fixed to the rear surface side.

As described above, since the left frame 19a and the right frame 19b support both ends of the clutch bar 95 immediately near the connecting portion with the strong horizontal frame 19c, the clutch pedal 96 is depressed. Even when the clutch bar 95 is rotated, the left and right frames 19a, 19b are prevented from being unnecessarily deformed due to insufficient strength, and the entire clutch can be reliably operated.

Further, a transmission case 3 disposed at the center of the body 19 in the left and right direction, and a continuously variable transmission 2 disposed on the left side thereof.
On the other hand, the clutch pedal 96 is arranged on the left side of the clutch bar 95 extending long in the left-right direction, and the connecting rod 92 and the like are arranged on the right side. , The maintainability of the continuously variable transmission 2 is improved. The operation of the main clutch 42 is performed by depressing the clutch pedal 96, via the clutch bar 95, the connecting rod 92, the arm 89, the shaft 82, and further via the eccentric piece 81 and the bearing 80 described above. Do it by moving. The clutch 41 is
When the clutch case 41 is moved to the left, it is disconnected, while when it is moved to the right, it is brought into contact.

The main shaft A is located in front of the transmission case 3, and the clutch operating shaft 82 is located in front of the main shaft A. A PTO shaft 33, which is an output device for a working machine, extends rearward from a planter shaft D located slightly above and behind the main shaft A. In addition, the inter-stock transmissions 39, 40, and 45, which constitute the work implement transmission 85 formed between the sleeve 37 and the planter shaft D, are located diagonally above and behind the main clutch 42. The traveling transmission 8
6 is located obliquely rearward and downward of the main axis A. The traveling forward / reverse switching device 87 is located between the planter shaft D and the transmission shaft B. The main clutch 42 and its clutch operating shaft 82 are provided in the space where the working machine output device 33, the working machine transmission 85, the traveling transmission 86, and the traveling forward / reverse switching device 87 are formed. ing.

A sleeve 43 is fixed to the planter shaft D by a spline or the like. A gear 45 is attached to the outer periphery of the sleeve 43 by a spline or the like so as to be slidable in the axial direction. 4
6 are attached. A bevel gear 47 is mounted on the right side of the intermediate portion of the planter shaft D so as to be rotatable relative to the planter shaft D.
Between them, a torque limiter 49 is formed. In addition,
The shift gear 39 is formed with a smaller number of teeth than the gear 40, and the gear 45 meshes with the shift gear 39 or the gear 40, thereby enabling inter-stock shifting with respect to the planter shaft D. Also, the bevel gear 47 is used for the PT
The O-shaft 33 meshes with the bevel gear.

A gear 50 is mounted on the left end of the transmission shaft B so as to be slidable in the axial direction, and gears 51a, 51
The twin gear 51 having the letter “b” is mounted so as to be slidable in the axial direction. A bevel gear 52 that meshes with the bevel gear of the drive shaft 29 (see FIG. 6) is fixed to the left portion of the transmission shaft C, and a gear 53a that meshes with the gear 51a, The gear 53b meshing with the gear 51b is fixed. A gear 56 that meshes with the gear 55a of the differential gear case 55 is fixed to an intermediate portion of the transmission shaft C. The axle housings 25a, 25b, 26a, 26b are provided on both sides of the differential gear case 55.
The front wheels 27,
27 is driven.

Next, the belt-type continuously variable transmission 2 will be described with reference to FIG. 2. A hydraulic drive pulley 7 is fixed to a base end of a drive shaft 5 composed of an output shaft of the engine 1. A fixed sheave 6a of the drive side pulley 6 is fixed to the drive shaft 5 outside the hydraulic drive pulley 7 by a key or the like. The movable sheave 6b is attached to the boss outside the fixed sheave 6a by a key or the like so as to be slidable in the axial direction. A cam member 11 having a cam portion 11a is rotatably mounted on a boss portion of the movable sheave 6b via a bearing or the like. This cam portion 11a is
A plurality of spiral profiles are formed on a circumferential surface centered at the center, and a roller member 12 rolling on the profile of the cam portion 11a is radially attached to a ring 12a, and the ring 12a is fixed to a fixed sheave. 6a
Is rotatably mounted on the outer end side of the boss.

Further, the transmission case 3 (the lower part of FIG. 2)
A cam portion 3a (having the same shape as that of the cam portion 11a) protruding from the outer surface of the cam shaft 3A is protruded, and a roller member 15 rolling on the profile of the cam portion 3a is radially formed on the ring 15a. Installed in. The ring 15a is rotatably mounted on the boss of the movable sheave 9b of the driven pulley 9. The movable sheave 9b
Is attached to the main shaft A by a key or the like so as to be slidable in the axial direction, and the fixed sheave 9a is fixed to the end of the shaft A.

A driving-side adjusting device 13 is constituted by the cam member 11, the roller member 12, the ring 12a and the like, and a driven-side adjusting device 16 is constituted by the cam portion 3a, the roller member 15, the ring 15a and the like. . An endless belt 10 is stretched between the driving pulley 6 and the driven pulley 9.

An arm 12c extending outward from the ring 12a is prevented from rotating by a pin 8a (screw pin) provided on a fixing member 8 protruding laterally from the engine or the like.

Next, the operation device 18 of the belt-type continuously variable transmission 2 will be described with reference to FIGS. 3 and 2. The cam member 11 shown in FIG. An arm 15b is protruded from the arm 11b, and these arms 11b and 15b are connected by a link 14. A substantially parallelogram is formed by the shafts 5 and A, the arms 11b and 15b, and the link 14. . An arm 57 is pivotally supported by a pin 8a that prevents the arm 12c protruding from the ring 12a. A tight pulley 59 is pivotally supported at the tip of the arm 57, and a tension spring 60 is attached to the base end. The tension of the tension spring 60 applies a predetermined tension to the endless belt 10 via the tight pulley 59. Further, the shaft 6 is provided on the body 19 in a lateral direction.
1, a mounting piece 62 is pivotally supported, a shaft 63 is provided on the mounting piece 62, an operating piece 65a is pivotally supported on the shaft 63, and an operation lever 65 is mounted on the operating piece 65a. A lever 66 is attached to the attachment piece 62, and the tip of the lever 66 and the tip of the arm 11b are connected by a rod 67 whose length can be adjusted. Also, the operating piece 65
a is provided with a projection 65b, and this projection 65b is engaged with the arm 69a of the reverse rotation switching shaft 69. The sliding gear 50 provided on the speed change shaft B shown in FIG.
However, the fuselage 19 moves forward when it meshes with the gear 45 on the main shaft A, and moves backward when it meshes with the gear 46 on the planter shaft D.

A U-shaped guide 71 as shown in FIG.
The lever 65g that is attached to the
1 is operated. When the guide 71 is moved right and left along the bottom, the right side (upper side in FIG. 3B) is the forward side, and the left side is the reverse side, and the neutral position is in the middle. Further, the forward / backward switching is performed on the operator side, and moving the lever 65 forward increases the speed.

A belt 7a is stretched between a pulley 70 attached to the hydraulic pump shaft E shown in FIG. 1 and a hydraulic drive pulley 7 shown in FIG.

Next, the operation of this embodiment will be described.

In the field, when the engine 1 is operated, the drive shaft 5 (see FIG. 2), which is the output shaft of the engine, is rotated, and is driven via the drive pulley 6, the endless belt 10, and the driven pulley 9, The main shaft A is driven. Then, when the main clutch 42 is brought into contact, the gear 40 rotates and the gear 4
5. The bevel gear 47 is driven via the planter shaft D and the torque limiter 49, and the PTO shaft 33 is driven via the bevel gear meshing with the bevel gear 47 (see FIGS. 5 and 6).
Is driven. At this time, when the gear 45 is meshed with the shift gear 39, the inter-stock speed is changed (the inter-stock distance becomes larger than when meshing with the gear 40).

The rear wheels 32, 32 are driven at a low speed via the gear 40, the gear 50, the transmission shaft B, the gear 51a, the gear 53a, the transmission shaft C, the bevel gear 52, and the drive shaft 29. At this time, when the meshing between the gears 51a and 53a is switched to the meshing between the gears 51b and 53b, the rear wheels 32 are driven at a high speed.

The front wheels 27 are driven by the gear 56 on the transmission shaft C meshing with the gear 55a of the differential gear case 55. And, like the rear wheels 32, 32, it is possible to switch between high and low speed.

When the gear 50 is moved to the right on the speed change axis B, the engagement with the gear 40 is cut off, and the gear 50 is shifted to the neutral position.
6 (because FIG. 1 is a development view, it is displayed so as not to mesh). Then, the low-speed reverse rotation is transmitted to the transmission shaft B via the main shaft A, the main clutch 42, the gear 40, the gear 46, and the gear 50. And
Thereafter, the rotation at a lower speed than in the forward movement is transmitted to the front wheels 27, 27 and the rear wheels 32, 32 in the same manner as in the forward movement.

Naturally, the working machine transmission 85 changes the gear 45 into engagement with the shift gear 39 and the gear 40, and the traveling transmission 86 uses the gear 51a and the gear 5a.
3a, the gears 51b and 53b are re-engaged, and the forward / reverse switching device 87 re-engages the gear 50 from the gears 40 to 46. There is a speed difference between the gears to be re-engaged. Therefore, when the clutch pedal 96 is depressed to operate the clutch operating shaft 82 and the main clutch 42 is disengaged, the above-described gear meshing relieves the impact on the gear to be meshed.

Next, referring to FIGS. 2, 3 (a) and 3 (b),
The operation of the belt-type continuously variable transmission 2 and the operation device 18 will be described. When the operation lever 65 is rotated around the shaft 63 at the bottom of the U-shaped guide 71, the protrusion 65b, the arm 6
9a, the reverse rotation switching shaft 69 is rotated, and the arm 69
By b, the center is neutral, the right end (the upper end in FIG. 3B) is set to forward, and the left end is set to reverse. That is, the gears 40 and 5
When the gears are engaged with each other, the gears 46 and 50 are moved forward. Then, in the forward or backward position, the operation lever 6
3 is rotated counterclockwise around the shaft 61 in FIG.
6, the arm 11b through the rod 67 and the link 14,
15b is rotated in the counterclockwise direction at substantially the same angle. The lift of the cam portion 11a is increased via the arm 11b, the cam member 11 is moved inward by the roller member 12, and the movable sheave 6b is moved inward, and
The movable sheave 9b is moved inward (right side) by moving the roller member 15 to a position where the lift of the cam portion 3a is small via b. Accordingly, the endless belt 10 moves to a position (shown by a solid line) on the outer side in FIG. 2, and increases the rotation speed of the main shaft A more than the rotation speed of the drive shaft 5. When the operation lever 65 is rotated clockwise in FIG. 3A, the operation lever 65 is moved to the position shown inside in FIG. The rotation speed is reduced and transmitted to the main shaft A. Then, the operation lever 65
The amount of movement of the belt-type continuously variable transmission 2 can be steplessly changed.

[Brief description of the drawings]

FIG. 1 is a developed sectional view of a mission.

FIG. 2 is a sectional front view of the belt type continuously variable transmission.

3A is a side view of the operation device, and FIG. 3B is a plan view showing a guide of the operation lever.

FIG. 4 is a plan view showing the airframe.

FIG. 5 is a side view of the airframe.

FIG. 6 is a side view of the riding rice transplanter embodying the present invention.

FIG. 7 is a plan view showing an arrangement of members for operating a clutch including a clutch pedal.

FIG. 8 is a side view showing the arrangement of each member.

[Explanation of symbols]

 Reference Signs List 2 continuously variable transmission (belt-type continuously variable transmission) 3 transmission case 4 driver's seat 19 traveling body (body) 19a left frame 19b right frame 19c horizontal frame 42 clutch body (main clutch) 92 connecting rod 95 clutch bar 96 clutch pedal 97 Step P Paddy Field Vehicle (Riding Rice Transplanter)

────────────────────────────────────────────────── ─── of the front page continued (72) inventor Yukio Kato Shimane Prefecture Yatsuka-gun Higashiizumo Oaza hate-cho, 667 th place 1 Mitsubishinoki within Co., Ltd. (58) investigated the field (Int.Cl. ^6, DB name) A01C 11/02 313 B60K 23/02

Claims (2)

(57) [Scope of request for utility model registration] 1. A paddy field vehicle having a clutch body disposed in a transmission case, a clutch bar extending in the left-right direction and rotatably supported, and the clutch being integrally connected to the clutch bar. A clutch pedal that rotates a bar; and a connecting rod that is interposed between the clutch bar and the clutch body and that operates the clutch body by rotation of the clutch bar. It is arranged below the step of the driver's seat of the traveling body, and distributes a connecting portion between the clutch bar and the clutch pedal and a connecting portion between the clutch bar and the connecting rod to both right and left sides with respect to the transmission case. A clutch mechanism for a paddy field working vehicle. 2. The vehicle according to claim 1, wherein the clutch bar is disposed close to a horizontal frame connecting the left frame and the right frame of the traveling body, and is rotatably supported by the left frame and the right frame. The clutch mechanism for a paddy field working vehicle according to claim 1, wherein: