JPH05252808A - Mechanism for operating speed change gear - Google Patents

Abstract

PURPOSE:To improve the operability by performing the operation of a a transmission and an infinite variable-speed device with one operating lever having the center of rotation on the base end side of a steering column. CONSTITUTION:A shaft 43 is erected in a bracket (42a) on the base end of a steering column 42 and the base end (41a) of an operating lever 41 is rotatably supported in the front and back directions. The lever body (41b) is supported through a pin 44 rotatably in the right and left directions relatively to the base end (41a). A U-shaped guide groove (47a) is formed in a guide plate 47 fixedly installed in the bracket (42a) to guide a bolt pin 46 integral with the operating lever 41. Thereby, the operating lever 41 is rocked in the front, back, right and left directions with the base end side of the steering column 42 nearly as the center to respectively operate the high and low speed of the infinite variable-speed device and the advancing and backing state of the transmission.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission suitable for use in a work vehicle such as a passenger rice transplanter, and more particularly to an operation mechanism for operating a mission and a continuously variable transmission with a single speed change lever. Regarding

[0002]

2. Description of the Related Art Generally, a rice transplanter for planting seedlings while self-propelled is equipped with a main transmission (mission) and an auxiliary transmission (continuously variable transmission). Is switched by shifting the main shift lever and the sub shift lever. Then, for example, while the main transmission is switched to forward / neutral / reverse, the auxiliary transmission is switched to high speed / low speed, and the two are appropriately combined to enable various traveling states.

Switching between these main and auxiliary transmissions is usually 2
This is done by the shift lever of the book. In the driver's seat of the traveling machine body, in addition to the steering wheel arranged in the center on the front side, a main gear shift lever and an auxiliary gear shift lever are erected so as to be swingable. If necessary, one gear shift lever is selectively operated to realize a desired traveling state.

[0004]

However, according to the above-mentioned structure, not only the main and sub shift levers are required, but also a supporting member for swingably supporting them,
It is necessary to provide a total of two similar members such as guide members for guiding the shift for each shift lever, which complicates the structure of the entire operation mechanism.

Further, since it is difficult to dispose the two speed change levers close to each other at the optimum position for operability,
There is a problem that the operability of at least one of the shift levers is sacrificed. That is, in view of the fact that the operation of these shift levers is performed while operating the steering wheel, the disposition position of the shift lever that is easy to operate is limited to an extremely narrow range near the steering wheel. However, if two speed change levers are arranged side by side in such a narrow range, this may cause an erroneous operation, and as a result, at least one speed change lever has to be placed away from each other, impairing its operability. become.

In view of this, the present invention has a structure in which the two gear shift levers are commonly used as one and the swing center of the levers is provided on the base end side of the steering column located substantially at the center of the operator. An object of the present invention is to provide an operating mechanism for a transmission that is simple and has excellent operability.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and includes a steering column (42) and a gear shift operation lever (41) in a driver seat (9) of a traveling vehicle body (5). And a transmission case (7) below the driver's seat (9), and a continuously variable transmission (17) on the side of the transmission case (7). Of the steering column (42), the shift operation lever (41)
Support member (42) for connecting and supporting the base end portion (41a) of the
a) is fixed, each rotation center (43, 44) for swingably supporting the shift operation lever (41) in the left-right direction and the front-back direction is provided on the support member (42a), and the shift operation lever (41) is provided. 41) The transmission case (7) is operated by swinging in the left-right direction, and the continuously variable transmission (17) is operated by swinging the shift operation lever (41) in the front-rear direction. And

In this case, the shift shaft (28) for switching between forward and backward movements, which projects from the mission case (7), extends below the continuously variable transmission (17) and is extended, and the continuously variable transmission is also provided. On the outer side of (17), a connecting rod (19) that connects the base end portion (41a) of the gear shift operation lever (41) and the shift shaft (28) in the up-down direction is provided, and the gear shift operation is performed. A structure in which the connecting rod (19) is rotated by swinging the lever (41) in the left-right direction, and the shift shaft (28) is slid in the left-right direction by this rotation to switch forward, neutral, and reverse of the mission. Is preferable.

[0009]

[Function] Based on the above configuration, one gear shift operation lever (4
The rocking of 1) in the left-right direction and the front-back direction operates the mission (main transmission) and the continuously variable transmission (sub-transmission) (17), respectively. Therefore, the gear shift operation lever (41) can be arranged at an optimum position for operability.

Further, the front and rear / left and right turning centers (43, 44) of the gear shift operation lever (41) are set to the steering column (4).
When the steering column (42) is provided at the base end side of (2), the gear shift operation lever is generally provided in view of the fact that the steering column (42) is disposed substantially at the center of the driver's seat (9), that is, substantially at the center of the operator in the sitting posture. Center of rotation of (41) (43, 44)
Is located on an extension of the center of the operator, and the tip end side of the gear shift operation lever (41) is erected from here to the upper side of the driver's seat (9). Therefore, when the operator grasps the tip of the gear shift operation lever (41) and swings the tip, the movement of the tip becomes a natural movement for the operator,
Operability is improved.

Further, when the shift shaft (28) is slid outside the continuously variable transmission (17) via the vertically extending connecting rod (19), the continuously variable transmission (17) and other It is possible to prevent interference between the device and the member and the connecting rod (19), and to reliably transmit the movement of the gear shift operation lever (41) to the shift shaft (28) with the minimum necessary number of members.

[0012]

As described above, according to the present invention,
The transmission and the continuously variable transmission (17) are operated by swinging the single shift operation lever (41) forward and backward and left and right,
Moreover, the rotation center (43, 4) of the gear shift operation lever (41)
By providing 4) on the base end side of the steering column (42), the overall structure can be simplified and the operability of the gear shift operation lever (41) can be significantly improved.

Further, the operation of the gear shift operation lever (41) is controlled by a shift shaft (2) of the transmission via a connecting rod (19) extending vertically outside the continuously variable transmission (17).
8), the interference between the connecting rod (19) and other members can be prevented, and the operation of the shift shaft (28) can be made smooth and reliable.

The reference numerals in the parentheses are for reference to the drawings and do not limit the structure in any way.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the riding rice transplanter P has a traveling machine body 5 supported by front wheels 2 and rear wheels 3, and an engine 6 and a mission case are provided in front of the machine body 5. 7 is mounted, and a driver's seat 9 having a seat 8 is arranged on the rear side thereof. Further, a planting device 11 is movably supported at the rear of the traveling machine body 5 via a link 10, and the planting device 11 includes a seedling stand 12, planters 13, a float 15 and the like, and a hydraulic pressure. It is driven up and down by the cylinder device 16.

Then, as shown in FIG. 2 (a), a belt type continuously variable transmission device 17 is provided between the output shaft 6a of the engine 6 and the mission input shaft 7a protruding from the mission case 7.
Are arranged. Further, on the side (outside) of the mission case 7, there is a forward / reverse switching shaft (connecting rod) 19
2 extends in the vertical direction, and a yoke 20 having a groove 20a is fixed to the upper end of the shaft 19 protruding from the mission case 7, as shown in FIG. 2 (b). A shift arm 21 is fixed to the lower end of the shaft 19 as shown in FIGS. 2 (c) and 6, and the arm 21 is mounted on the transmission case 7 via a shift shaft 28 to move forward and backward. A switching gear (not shown) can be operated to switch between the forward drive state F, the neutral drive state N and the reverse drive state R.

On the other hand, the belt type continuously variable transmission 17 is
It has a drive side pulley 22 mounted on the engine output shaft 6a and a driven side pulley 23 mounted on the mission input shaft 7a, and a V belt 24 is wound between these. The drive side pulley 22 and the driven side pulley 23 are shown in FIG.
As shown in FIG. 5, the fixed sheaves 25 and 26 and the movable sheaves 27 and 29 are formed, and the movable sheave bosses 27a and 29a are slidably inserted into the fixed sheave bosses 25a and 26a by the key 38. And
Shift adjusting members 30 and 31 are provided on the shaft tip side of the drive side pulley 22 and the case side of the driven side pulley 23, respectively.

The drive-side adjusting member 30 has a bearing at the tip of the drive-side fixed sheave boss 25a and a fixing member 3.
4 has a roller support body 32 which is connected to and is supported by the four.
The roller 32a is rotatably supported with a phase difference. A cam member 33 is rotatably supported by a bearing on the drive-side movable sheave boss 27a. The cam member 33 has an end face cam portion 33a in contact with the roller 32a and has an outer diameter. It has an arm portion 33b extending in the direction.

The driven-side adjusting member 31 also has a roller support 35 fixed to the outer surface of the transmission case 7 and a cam member 36 rotatably supported on the movable sheave boss 29a via a bearing. The roller support member 35 rotatably supports the two rollers 35a, and the cam member 36 includes the end surface cam portion 36a in contact with the roller 35a and the arm portion 3 extending in the outer diameter direction.
6b.

The roller support member 35 is shown in FIG.
As shown in (b), the roller 35 is composed of a notched annular body (C-shaped body) cut away at a predetermined angle, and is separated by 180 degrees.
A bolt 37 for supporting a is planted in the outer peripheral direction and is fixed to the side wall of the mission case 7 by a bolt 39. Although the mission case 7 is formed with a portion 7c that holds the bearing 40 for the shaft 7a and a convex portion adjacent to the portion 7c, the roller support 35 has an annular portion that surrounds the bearing holding portion 7c. Moreover, the cutout portion 35c is arranged so as to correspond to the convex portion. Further, when the recessed portion of the end face cam portion 36a is in contact with the roller 35a (see the lower plan view of FIG. 3), the protruding portion of the cam portion 36a is set to be located in the cutout portion 35c. As a result, the amount of protrusion of the roller support body 35 from the side surface of the case is suppressed to a minimum, the driven side pulley 23 is arranged close to the mission case 7, and is prevented from interfering with the forward / reverse switching shaft 19 to be compact. I am trying to make it.

A gear shift operation lever 41 extends upward from the portion of the continuously variable transmission 17 toward the driver's seat 9. As shown in FIGS. 2 and 6, the operation lever 41 is swingably supported by a shaft (rotation center) 43 fixed to a steering column 42 via a bracket (support member) 42a. The base end portion 41a and the base end portion 4
1a and a lever main body 41b supported by a pin (rotation center) 44 so as to be swingable in the left-right direction of the machine body. Furthermore,
A plate 45 is fixed to the root portion of the lever body 41b, and the pin 45 is supported by the plate 45, and the bolt pin 46 penetrates through the plate.
Is fixed. One end portion 46a of the bolt pin 46
Is the yoke groove 20 of the forward-reverse switching shaft 19
a can be engaged with or disengaged from
b is the above-mentioned bracket 42 on the steering column 42.
The guide plate 47 is fitted in the U-shaped guide groove 47a fixed via a (see FIG. 6). Therefore, the operation lever 41 can be operated only in the front-rear direction (HL) at the R (reverse) or F (forward) position by being guided by the guide groove 47a.

As described above, the operation lever 41 is provided with the shaft 43 which is erected on the bracket 42a of the steering column 42.
The base end portion 41a is swingably supported in the front-rear direction by a pin 44 so as to be swingable in the left-right direction. That is, the operation lever 41 is supported by the base end side of the steering column 42 so as to be swingable in the front-rear and left-right directions. Also, this steering column 4
2 is provided at the center of the driver's seat 9 in the left-right direction,
The steering wheel 42b is rotatably supported. Therefore, the operation lever 41 having the shaft 43 and the pin 44, which are pivotal centers, on the base end side of the steering column 42.
Has a rotation center substantially in the center of the driver's seat 9, that is, substantially in the left-right direction of the worker in the sitting posture. As a result, the operability of the conventional operation lever 41 is remarkably improved in combination with the fact that the conventional operation lever 41 is shared by one operation lever.

4 (a), 4 (b) and 5 (a),
As shown in (b), the operation arm 41c extends in a bell crank shape with respect to the shaft 43 at the base end portion 41a of the operation lever 41, and the distal end of the integrated arm 41c and the drive side adjusting member 30. A cam operating rod 49 is connected between the cam member 33 and the arm portion 33b. The rod 49 is composed of two members having a male screw 49a and a female screw 49b, and its length can be adjusted. A cam connecting rod 50 is interposed and connected between the arm portion 33b of the cam member 33 of the driving side adjusting member 30 and the arm portion 36b of the cam member 36 of the driven side adjusting member 31. The cam members 33 and 36 can move integrally. Further, as shown in detail in FIG. 5, both the driving side cam member 33 and the driven side cam member 36 have the same shape. Therefore, the connecting rod 50 constitutes a parallel link mechanism, and both cam members connected by the rod. The members 33 and 36 move the same amount based on the cam operating rod 49. That is, the engine output shaft (that is, the drive pulley shaft) 6a center line O ₁ and the transmission input shaft (i.e. the driven pulley shaft) 7a line O ₁ -O connecting the center line O ₂ of the
₂ , the connecting rod 50 moves in parallel, and at the drive side cam member 33 and the driven side cam member 36, the center line O
It is arranged so as to operate on the high speed side H and the low speed side L centering on the lines O ₁ -c ₁ and O ₂ -c ₂ orthogonal to ₁ -O ₂ . Therefore, in the drive side cam member 33, the center line O ₁ of the engine output shaft 6a, the connecting rod 50, and the arm portion 36.
The high speed side H and the low speed side L of the continuously variable transmission 17 are distributed around the line O ₁ -c ₁ which connects the connecting pin 52 with the connecting pin 52 with the center line of the connecting rod 50 at 90 degrees. Similarly, also in the driven side cam member 36, the line connecting the mission input shaft 7a and the connecting pin 53 is the connecting rod 5
The high-speed side H and the low-speed side L are distributed around the line O ₂ -c ₂ which is 90 degrees with respect to 0.

The connecting pin 52 of the connecting rod 50 with the drive side cam member 33 is a common connecting pin with the operating rod 49, and the operating rod 49 substantially wraps with the connecting rod 50 in a side view. The lengths of the operating rod 49 and the operating arm 41c are set so that the operating rod 49 moves so as to approximate the parallel line of the connecting rod 50. Further, as shown in detail in FIG. 5A, the connecting rod 50 connects the drive side adjusting member 30 located on the front side of the pulley 22 and the driven side adjusting member 31 located on the base side of the pulley 23. In order to avoid interference with the operating rod 49 that is positioned so as to be wrapped, the intermediate portion is largely bent.

In FIGS. 5 and 3, reference numeral 55 is a hydraulic pulley fixed to the engine output shaft 6a, and 56 is a hydraulic pulley.
Is a pulley connected to the hydraulic pump, and 57 is a pulley 5
The belt is wound around 5,56, and 59 is its tight pulley. And 60 is the belt 2 of the continuously variable transmission.
4 is a tight pulley for giving a predetermined tension, 61 is a pin planted in a fixing member, 62 is rotatably supported by the pin, one end supports the tight pulley 60, and the other end has a spring 63 stretched. It is a tight arm.

On the other hand, as shown in FIG. 4 (b) and FIG. 7, a fan-shaped positioning plate 66 is integrally fixed to the operation lever base end portion 41a supported by the shaft 43, and the plate 66 is fixed. A large number of concavo-convex portions 66a are formed at the tip portion of. A roller 69 is rotatably supported at an intermediate portion of an arm 67 that is swingably supported by a fixed member, and a spring 70 is stretched at a tip portion thereof. The roller 69 is the spring 70.
The elastic force is applied to the uneven portion 66a of the plate 66 so as to elastically hold the operating lever 41 and the continuously variable transmission 17 at a predetermined shift operation position.

Next, the operation of the transmission in the above-mentioned riding rice transplanter P will be described.

The gear shift operating lever 41 is attached to the bolt pin 4
6 is guided by the guide groove 47a of the guide plate 47,
For example, when the forward position F is operated in the forward direction, that is, from the low speed position L in the high speed H direction, the operation arm 41c integral with the base end portion 41a of the lever 41 rotates counterclockwise about the shaft 43. Then, the cam member 33 on the drive side is moved from the low speed position L to the high speed position H via the operating rod 49 connected to the operation arm 41c, and the cam member 33 is further moved.
The cam member 36 on the driven side is similarly moved via the connecting rod 50 connected to. At this time, since the driving-side and driven-side cam members 33 and 36 are distributed to the left and right around the positions where the arm portions 33b and 36b thereof are orthogonal to the connecting rod 50 and the operating rod 49, the operating arm 41c. To the actuating rod 49, the actuating rod 49 to the driving side cam member arm portion 33b, the arm portion 33b to the connecting rod 50, and the connecting rod 50 to the driven cam member arm portion 36b efficiently in a nearly orthogonal state. The force is transmitted, and both cam members 33 and 36 can be moved reliably with a small lever operating force.

The cam members 33, 36 move in the axial direction when the end surface cam portions 33a, 36a rotate while contacting the rollers 32a, 35a fixed in the revolution direction and the axial direction. Then, the movable sheave 27 of the drive side pulley 22 is adjusted so that the pulley effective diameter becomes small, and the movable sheave 29 of the driven side pulley 23 is adjusted so that the pulley effective diameter becomes large. As a result, the belt type continuously variable transmission 17 is shifted to the high speed side, and the high speed rotation is transmitted through the mission in the mission case 7 to the wheels 2 and 3, the planter 13 of the planting device 11 and the seedling stand 1
2 is transmitted. When the shift operation lever 41 is operated from the high speed side to the low speed side, the continuously variable transmission is similarly shifted to the low speed side.

When the operating lever 41 is operated to the low speed position L, the pin 46a planted in the plate 45 integrated with the lever body 41b engages with the groove 20a of the yoke 20.
In this state, when the operation lever 41 is operated in the left-right direction around the pin 44 and the pin 46b along the guide groove 47a, the shift shaft 22 is operated in the axial direction via the yoke 20, the shaft 19 and the shift arm 21. To do. This allows
Depending on the lateral operation positions F, N, R of the operation lever 41, the forward / reverse switching gears in the mission case 7 are operated to the forward position F, the neutral position N and the reverse position R, respectively.

Although the above-described embodiment has been described with respect to the operating mechanism of the transmission mounted on the riding rice transplanter, the present invention is not limited to this, and is similarly applicable to operating mechanisms of other working vehicles such as combine harvesters.

[Brief description of drawings]

FIG. 1 is a side view showing a riding rice transplanter equipped with a belt-type continuously variable transmission.

2A is a side view showing an operating device for a continuously variable transmission and a forward / reverse switching device, FIG. 2B is a front view of a yoke thereof, FIG.
(c) is a plan view showing the forward / reverse shift arm.

FIG. 3 is a sectional view showing a continuously variable transmission.

FIG. 4 is a diagram showing an operating device of a continuously variable transmission, in which (a) is a plan view and (b) is a side view.

FIG. 5 is a view showing the main part of the operating device, (a) is a plan view,
(b) is a side view.

FIG. 6 is a rear view showing the operating device.

FIG. 7 is a diagram showing a main part thereof.

FIG. 8 is a view showing a roller support and a roller on a driven side,
(a) is a front view and (b) is a side view.

[Explanation of symbols]

 5 Travel Aircraft 7 Mission Case 9 Driver's Seat 17 Continuously Variable Transmission (Belt Type Continuously Variable Transmission) 19 Connecting Rod (Forward / Reverse Switching Shaft) 28 Shift Shaft 41 Shift Operating Lever (Operating Lever) 41a Base End 42 Steering Column 42a Support member (bracket) 43 Rotation center (spindle) 44 Rotation center (pin)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsushi Sasaki 667 Izuya-cho, Higashi-Izumo-cho, Yatsuka-gun, Shimane Prefecture 1 Mitsubishi Agricultural Machinery Co., Ltd. Address 1 Within Mitsubishi Agricultural Machinery Co., Ltd.

Claims (2)

[Claims] 1. A steering column and a gear shift operation lever are provided in a driver's seat of a traveling machine body, a mission case is provided below the driver's seat, and a continuously variable transmission is provided on a side of the mission case. In the operation mechanism of the transmission arranged, a support member for connecting and supporting the base end portion of the gear shift operation lever is fixed to the base end side of the steering column, and the gear shift operation lever is attached to the support member in the left-right direction. , Each of which has a center of rotation for swinging in the front-rear direction, the transmission case is operated by swinging the shift operation lever in the left-right direction, and the stepless shift is performed by swinging the shift operation lever in the front-rear direction. The operating mechanism of the transmission that operates the device. 2. A forward / reverse switching shift shaft protruding from the transmission case is extended below the continuously variable transmission, and the base of the gear shift operation lever is provided outside the continuously variable transmission. A connecting rod that connects the end portion and the shift shaft by extending in the up-down direction is provided, and the connecting rod is rotated by swinging the shift operation lever in the left-right direction. The operation mechanism of the transmission according to claim 1, wherein the transmission is slid in the left-right direction to switch the mission between forward, neutral, and reverse.