JPH0737765U - Gearbox for riding mobile agricultural machine - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the operator touches the change lever, the change lever cannot be connected to the forward position or the backward position so that abnormal noise is not generated when the gears are out of mesh. [Structure] The traveling speed is varied by operating the change lever 21 in the front-rear direction, and the traveling machine body is switched forward and backward by operating the change lever 21 in the left-right direction. An operation restricting member that restricts the operation when the change lever 21 is returned to the neutral position and does not restrict the operation, and when the change lever at the neutral position is switched to either forward or backward position, and the operation restricting member. And a restriction releasing member that releases the restriction of the switching operation of the change lever 21 by the operation of releasing the clutch.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a riding mobile agricultural machine, and more particularly, to a transmission device that continuously changes the traveling speed of a traveling machine body from a low speed to a high speed and moves the machine forward and backward.

[0002]

[Prior art]

 In a conventional transmission system for a mobile agricultural machine, for example, one change lever is arranged on the side of a steering column, and the change lever is rotated in the front-rear direction so that the traveling speed of the traveling machine can be controlled from low speed to high speed. The gear body is moved forward and backward by rotating in the left and right directions as well as shifting gears.

[0003]

[Problems to be solved by the device]

 In such a conventional transmission system for a riding mobile agricultural machine, since the change lever is arranged on the side of the steering column, the operator comes in contact with the change lever when getting on and off the traveling machine body to apply the forward or backward driving force. There is a problem that the transmission gear may be connected, which may cause the riding mobile agricultural machine to suddenly start.

Further, when the operator gets in and out of the vehicle, the change lever is brought into contact with the clutch pedal so as not to depress the clutch pedal to connect the gears in the forward direction or the backward direction. Therefore, the power-side gear and the transmission-side gear are securely connected. There is a problem that the gears are not meshed with each other, an abnormal sound is generated when the gears are not meshed, and the gear is damaged.

The present invention has been made to solve the above problems, and prevents the operator from connecting the change lever to the forward position or the backward position even if the operator contacts the change lever, and when the gear is not meshed. An object of the present invention is to provide a transmission for a riding mobile agricultural machine that eliminates the generation of abnormal noise.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, therefore, in the transmission for a riding mobile agricultural machine according to the present invention, the change lever (21) is operated in the front-rear direction to change the traveling speed, and the change lever (21) is operated in the left-right direction. By moving the traveling body (5) forward and backward, the switching operation is restricted when the change lever (21) at the position for moving the traveling body (5) forward or backward is returned to the neutral position. If the change lever (21) at the neutral position is switched to either forward or backward position, the operation restricting member restricts the switching operation, and the operation restricting member restricts the switching operation of the change lever (21). Is provided with a restriction releasing member for releasing the lock in conjunction with the operation of cutting the clutch.

[0007]

[Action]

 Based on the above structure, the change lever (21) is switched back and forth or left and right to move the traveling vehicle body (5) in high-low shift or forward and backward traveling. Further, when the change lever (21) is in the neutral position, the change lever (21) is released from the switching operation restriction linked to the clutch release operation of the restriction release member, and the change lever (21) is moved forward or backward. If it is in the position, it can be returned to the neutral position.

The above-mentioned reference numerals in parentheses are intended for the drawings, but do not limit the configuration of the present invention at all.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 to 7 are views showing an embodiment of the present invention. In FIG. 5, the passenger rice transplanter 1 has a traveling machine body 5 supported by front wheels 2 and rear wheels 3, and an engine 6 and a mission case 7 (see FIG. 1, 2) is mounted, and a driver's cab 9 having a driver's seat 8 is arranged at the rear part thereof. A planting part 11 is supported by a link 10 at the rear of the traveling machine body 5 so as to be able to move up and down, and a seedling stand 12, planters 13, and a float 15 are attached to the planting part 11. .

As shown in FIG. 6, a belt type continuously variable transmission 16 is arranged between the engine output shaft 6 a of the engine 6 and the mission input shaft 7 a protruding from the mission case 7. A forward / reverse switching shaft 17 protruding from the transmission case 7 extends vertically from the side of the mission case 7. The forward / backward switching shaft 17 has an upper end portion shown in FIGS. As described above, the guide plate 19 attached to the bracket 18a of the steering column 18 is rotatably penetrated. As shown in FIG. 2, a shift arm 20 is fixed to the lower end of the forward / reverse switching shaft 17, and the shift arm 20 is built in the mission case 7 via a shift shaft (not shown). The forward / reverse switching gear (not shown) is operated to switch to the forward drive state F, the neutral drive state N and the reverse drive state R.

On the other hand, as shown in FIGS. 2 and 5, on the cab 9, there is provided a change lever 21 which can be rotated forward and backward and left and right, and a restriction release clutch 22 which controls the rotating operation of the change lever 21. Is attached to. As shown in FIGS. 1 and 2, the change lever 21 is mounted on the plate 21a, which is rotatably supported by a support shaft 23, and is rotatably supported by a pin 24. The support shaft 23 comprises a lever body 21b and is fixed to a bracket 18a that supports the steering column 18. Then, by rotating the change lever 21 in the front-rear direction about the support shaft 23, the traveling speed of the traveling machine body 5 is continuously switched from low speed to high speed, and the change lever 21 is rotated in the left-right direction about the pin 24. By moving it, the traveling machine body 5 is moved forward or backward.

An operation pin 25 fitted into a U-shaped guide groove 19a (see FIG. 3B) of the guide plate 19 is fixed to the lower end of the plate 21a, and the guide plate 19 is fixed. An operation plate 26 having a triangular groove 26a (see FIG. 3A) is rotatably provided on the upper surface of the guide plate 19 with respect to the guide plate 19. The upper end of the forward / reverse switching shaft 17 is fixed to the operation plate 26, and the operation pin 25 is fitted in the triangular groove 26a. Further, a rotation restricting groove 26b is bored at the rotation tip of the operation plate 26, and a crank arm 27 engaging with and disengaging from the rotation restricting groove 26b is provided in the rotation restricting groove 26b. The crank arm 27 is rotatably supported by the bracket 18a, and is supported by the lower bent portion 27a and the rotation center shaft 22a of the regulation releasing clutch 22 to rotate the regulation releasing clutch 22. A link 29 is connected to a lever 28 that rotates integrally with the movement, and a spring 48 that constantly urges the deregulation clutch 22 to the upward position is attached to the deregulation clutch 22.

Then, the guide plate 19 having the guide groove 19a, the operation plate 26 having the triangular groove 26a, and the lower end of the plate 21a of the change lever 21 are fixed to the guide plate 19 and penetrate the guide groove 19a and the triangular groove 26a. The operation pin 25, the crank arm 27 engaging with and disengaging from the rotation restricting groove 26b, and the spring 48 constitute an operation restricting member.

Further, the regulation releasing clutch 22 is provided with a rod (not shown) for rotating the tension arm supporting the tension roller, and this rod is associated with the regulation releasing operation of the regulation releasing clutch 22. The belt-type continuously variable transmission 16 functions as a clutch that eliminates the tension of the V-belt 33 and blocks the transmission of rotation from the driving pulley 30 to the driven pulley 32. The regulation releasing clutch 22, the lever 28, and the link 29 connected to the crank arm 27 constitute a regulation releasing member.

A fan-shaped positioning plate 49 is integrally fixed to the support shaft 23, and a large number of cam portions are formed at the tip portion of the plate. Further, at the one end of the support shaft 23, a speed change plate 31 for supporting the movable sheave 30a of the drive side pulley 30 of the belt type continuously variable transmission 16 is supported.

The belt type continuously variable transmission 16 has a drive side pulley 30 mounted on the engine output shaft 6a and a driven side pulley 32 mounted on the transmission input shaft 7a. A V-belt 33 is wound around. The drive side pulley 30 and the driven side pulley 32 are composed of fixed sheaves 30b and 32b and movable sheaves 30a and 32a, respectively, as shown in FIG. 6, and the fixed sheaves 30b and 32b are fitted to the fixed sheave bosses 30c and 32c. The movable sheaves 30a and 32a are fitted to the movable sheave bosses 30d and 32d that are slidably inserted by the key 34. Further, shift adjusting members 35 and 36 are disposed on the shaft tip side of the drive side pulley 30 and the case side of the driven side pulley 32, respectively.

The drive-side shift adjusting member 35 has an annular roller support 38 which is rotatable only within a predetermined range through a bearing 37 at the tip of the drive-side fixed sheave boss 30c. The roller support 38 is a fixed member. It is connected to 39. A roller 38a is rotatably supported on the roller support 38 with a phase difference of 180 degrees. A cam member 41 is rotatably supported by a bearing 40 on the drive-side movable sheave boss 30d, and a cam having an inclined surface that comes into contact with the roller 38a at the end surface of the cam member 41. 41a are formed 180 degrees apart from each other, and an arm portion 41b is provided on the circumferential surface of the cam member 41 so as to extend in the diametrical direction at 90 degrees apart from the cam 41a.

The driven-side shift adjusting member 36 is fixed to the outer surface of the transmission case 7, and is rotatably supported on the annular roller support 42 and the driven-side movable sheave boss 32d via a bearing 43. A cam member 44 is formed, and the roller support body 42 rotatably supports two rollers 42a at 180 degrees apart. Further, a cam 44a with which the roller 42a abuts is formed on the end surface of the cam member 44, and an arm portion 44b extending in the diametrical direction is formed at a 90 degree phase with respect to the cam 44a.

In FIG. 6, reference numeral 45 denotes a hydraulic pulley fixed to the engine output shaft 6a. A belt 46 is wound between the hydraulic pulley 45 and a pulley (not shown) connected to the hydraulic pump. It has been turned. Reference numeral 47 is a tight pulley that applies a predetermined tension to the belt 33 of the belt type continuously variable transmission 16.

Next, the operation will be described.

When the rice transplanter 1 is run, the deregulation clutch 22 is stepped on and the lever 28 thereof is rotated in the direction of arrow A shown in FIG. 2 against the biasing force of the spring 48, and the link 29 is used. The crank arm 27 is rotated in the arrow B direction shown in FIG. As a result, a clutch disengagement operation in which the upper end of the crank arm 27 is disengaged from the rotation restriction groove 26b of the operation plate 26 is performed, and the change lever 21 in the neutral position can be switched to the forward position or the backward position. Becomes That is, when the clutch disengagement operation in which the crank arm 27 is disengaged from the rotation restricting groove 26b is performed, the operation plate 26 becomes rotatable around the pivotal support position of the upper end of the forward / reverse switching shaft 17.

Now, for example, by rotating the change lever 21 around the pin 24 in the counterclockwise direction in FIG. 4, that is, from the neutral position indicated by the symbol M in FIG. 1 to the forward position side indicated by the symbol F, the operation pin 25 is moved. The operation plate 26 moves along the guide groove 19a of the guide plate 19 and rotates from the neutral position shown in FIG. 7 (b) to the forward position shown in FIG. 7 (c). You will move forward.

Further, the operation pin 25 fixed to the plate 21 a is moved along the guide groove 19 a of the guide plate 19 by moving the change lever 21 in the direction of arrow C shown in FIG. And is guided from the front to the rear, and at the same time, the positioning plate 49 is rotated to rotate the transmission plate 31. Due to the rotation of the variable speed plate 31, the cam member 41 is displaced from the low speed side to the high speed side so that the movable sheave 30a of the drive side pulley 30 approaches the fixed sheave 30b and the movable sheave 32a of the driven side pulley 32 is fixed. The forward running speed of the rice transplanter 1 is gradually changed from low speed to high speed by separating from 32b.

In addition, by rotating the change lever 21 around the pin 24 in the clockwise direction in FIG. 4, that is, from the neutral position indicated by the symbol M in FIG. 25 moves along the guide groove 19a of the guide plate 19, and the operation plate 26 rotates from the neutral position shown in FIG. 7 (b) to the retracted position shown in FIG. 7 (a). Aircraft 1 will retreat.

In the above embodiment, an example in which the transmission control device mounted on the riding rice transplanter 1 is provided with an operation restricting member is not limited to the riding rice transplanter 1, but the operation restricting member of the transmission device is a combine or the like. It can be used for other riding mobile agricultural machines.

[0027]

[Effect of device]

 As is apparent from the above description, according to the present invention, when returning the change lever connected to the forward position or the reverse position to the neutral position, the operation thereof is not restricted and the change lever in the neutral position is moved forward and backward. Since an operation control member that restricts the operation when operating to any position is provided, even if the operator accidentally touches the change lever when getting on and off the traveling vehicle, it will not connect to the forward or reverse position. As a result, the traveling aircraft does not suddenly start. In addition, it is possible to eliminate the generation of abnormal noise due to gear disengagement due to erroneous operation of the change lever, and to prevent damage to the gear that switches between forward and reverse.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a transmission in a riding mobile agricultural machine according to the present invention.

FIG. 2 is a side view showing an extracted essential part of the same.

3A and 3B are diagrams showing an operation regulating member, FIG. 3A is a plan view showing an operation plate, and FIG. 3B is a plan view showing a guide plate.

FIG. 4 is a front view showing a further extracted main part of FIG.

FIG. 5 is a side view showing a riding mobile agricultural machine.

FIG. 6 is a cross-sectional view showing the above transmission.

FIG. 7 is a view for explaining the operation of the above-mentioned operation restricting member,
(A) is a plan view showing a change lever position in a retracted state, (b) is a plan view showing a change lever position in a neutral state, and (c) is a plan view showing a change lever position in an advanced state. is there.

[Explanation of symbols]

 19 guide plate 19a guide groove 21 change lever 21a plate 26 operation plate 26a triangular groove 26b rotation restriction groove 27 crank arm 28 lever 29 link

Claims (1)

[Scope of utility model registration request] 1. A riding mobile agricultural machine in which a traveling speed is changed by operating a change lever in the front-rear direction and the traveling machine body is switched between forward and backward movements by operating the change lever in the left-right direction. When the change lever in the forward or backward position is returned to the neutral position, the switching operation is not restricted, and when the change lever in the neutral position is switched to either the forward or backward position, the switching operation is restricted. And a regulation releasing member that releases the regulation of the switching operation of the change lever by the operation regulating member in association with the clutch disengagement operation, the transmission device for a riding mobile agricultural machine.