JP2000025586A - Parking brake operating mechanism in traveling working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a parking brake operating mechanism in a traveling vehicle performing stable operation. SOLUTION: A clutch pedal 19 to uncouple a clutch 18 and to couple a parking brake 21 provided on a transmission case 24 side is connected to the clutch 18 and the parking brake 21, and an urging means 64 to urge an operating shifter of the parking brake 21 so as to uncouple the parking brake 21 to the position away from a traveling device 2 in a rod 56 to connect the clutch pedal 19 side to the parking brake 21 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parking brake operating mechanism for a traveling work vehicle such as a combine which operates when a traveling clutch is connected or disconnected by a clutch pedal or the like and a parking brake is simultaneously activated.

[0002]

2. Description of the Related Art Conventionally, a clutch pedal for connecting / disconnecting a driving force to a traveling device side so that a traveling work vehicle such as a combine or the like performs a clutch disengagement operation and a parking brake on operation when depressing operation is performed. It is known that a parking brake operating mechanism that is configured to be connected to the vehicle is provided. Generally, when the clutch pedal is not depressed on the shifter side for operating the parking brake (the clutch is engaged and operated). There is provided an urging means (spring) for urging the shifter so as to turn off and operate the parking brake.

[0003]

However, the spring is usually an arm (shifter arm) attached to a shifter.
However, since the parking brake is provided on the transmission case side close to the traveling device, the shifter arm and the crawler traveling device are close to each other, and mud and the like jumped up by the crawler traveling device easily adhere to the spring side. However, the operation of the spring is hindered by the mud and the like, and the parking brake operation mechanism may not operate stably.

[0004]

A parking brake operating mechanism in a traveling work vehicle according to the present invention for solving the above-mentioned problems is provided on the transmission case 24 side close to the traveling device 2 by disengaging the clutch 18 at the time of depressing operation. Traveling device 2 so that the parking brake 21 is turned on.
A clutch pedal 19 for connecting and disconnecting the driving force to the side is provided in connection with the clutch 18 and the parking brake 21, and the shifter for operating the parking brake 21 is biased so that the parking brake 21 is cut off and operated. Urging means 6
4, the urging means 64 is connected to the rod 56 connecting the clutch pedal 19 and the parking brake 21.
The first feature is that it is provided at a position away from the traveling device 2 in.

A slider 57 for transmitting the swing of the clutch pedal 19 in the brake application direction to the rod 56 by contact with the rod 56 is slidably attached to the rod 56, and the urging force of the urging means 64 is provided. A second feature is that the slider 57 and the rod 56 are set so as to be always in contact with each other.

Further, a support portion 66 for supporting the urging means 64 on the rod 56 side is provided slidably on the rod 56, and the urging force of the urging means 64 is adjusted by adjusting the position of the support portion 66 with respect to the rod 56. The third feature is that it is a mechanism.

[0007]

FIG. 1 is a side view of a combine which is a traveling work vehicle to which the present invention is applied. The body 1 of the combine according to the present invention is formed on a body frame 3 supported by a crawler-type traveling device (crawler traveling device) 2, and a pre-processing unit 4 is vertically movable forward and downward with respect to the aircraft 1. And a threshing unit 6 provided on the left rear side. A driver's seat 7 is provided on the right side of the body 1.
A front operation panel 9 provided with a control lever 8 and the like is provided in front of the vehicle, and a side operation panel 12 provided with a shift lever 11 and the like is provided on the left side.

On the other hand, behind the driver's seat 7 is an engine room 1
2, the driving force of the engine 16 in the engine room 14 is provided below the floor 13 of the driver's seat 7 and is close to the crawler traveling device 2 (the lower portion is in a side view). The transmission 17 is transmitted to the transmission 17 via a clutch 18 so as to be freely connected and disconnected. However, a clutch pedal 19 for operating the clutch 18 protrudes from the floor 13 so that the clutch pedal 19 can be depressed. As described later, the driving force is connected to and disconnected from the crawler traveling device 2 (driving force is input from the transmission 17 as in the related art).

The driving force input to the transmission 17 is the same as the conventional one, and the left and right drive shafts 28 for inputting the driving force to the driving wheels 2a of the left and right crawler traveling devices 2 are used.
The transmission is transmitted via an operating brake clutch provided for each drive shaft 28. At least one of the brake clutches is provided with a fixed brake clutch and a drive shaft 28 corresponding to the brake clutch.
, And the parking brake 21 for fixing one of the crawler traveling devices 2 is provided.

On the other hand, the clutch 18 has an output pulley 32 attached to an output PTO shaft 23 projecting from the engine 16 and an input main shaft projecting from a hydraulic continuously variable transmission (HST) attached to the transmission 17 side. Input pulley 33 attached to 27
Are tension clutches connected via a belt 34 which is a connecting tool, and are connected to the clutch pedal 19 side so that the idler 36 is operated by operating the clutch pedal 19 as described later.

That is, when the tension is applied to the belt 34 by the idler 36, the clutch 18 is engaged and the driving force is transmitted from the output pulley 32 to the input pulley 33, and the clutch 18 is disengaged by releasing the tension on the belt 34. The transmission of the driving force is cut off, and the clutch pedal 19 is turned on and off by depressing the clutch 18 and released by releasing the depressing operation.
Operated by Note that the clutch pedal 19 is biased to an initial posture before the depressing operation as described later.

Next, the clutch pedal 19 and the clutch 1
The connection structure with the 8 (idler 36) side will be described.
As shown in FIGS. 2 and 3, the clutch pedal 19 has a substantially L-shaped pedal rod 39 having a pedal 38 attached to an upper end thereof, from a support rod 37 rotatably supported and provided horizontally in the left-right direction. Are extended upward, and plates 42 and 45 for connection with the clutch 18 side and the parking brake 21 side are fixed to the support rod 37.

On the other hand, as in the prior art, the idler 36 is mounted on a support arm 44 rotatably supported by a fulcrum shaft 43 on the transmission case 24 side, and an engagement pin 46 is fixedly provided at an end from the support arm 44. The driven arm 47 protrudes upward. A drive arm 49 capable of engaging with the engagement pin 46 is rotatably supported at the upper end of the fulcrum shaft 43. The drive arm 49 is connected to the plate 42 via a clutch rod 52. ing.

The driven arm 47 has a clutch spring 5 for urging the support arm 44 so that the idler 36 is pressed toward the belt 34 to engage and operate the clutch 18.
When the clutch pedal 19 is depressed by the above-described structure, the engagement pin 46 is connected via the clutch rod 52 and the drive arm 49.
And the drive arm 49 are engaged, and the clutch 18 is disengaged and actuated against the urging force of the clutch spring 51.

On the other hand, the parking brake 21 is provided with a shifter for operation (for on / off operation) as in the prior art, and an operation arm (shifter arm) 31 is attached to the shifter. Is connected to the above-described arm 45 via a brake rod 56 having a structure described later, and the parking brake 21 is operated by being depressed by depressing the clutch pedal 19, and is depressed by being released by depressing the depression of the clutch pedal 19. , The shifter arm 31 is operated in accordance with.

That is, the clutch pedal 19 (the pedal 3
8) Depressing operation or depressing operation of the support rod 3
7, the plates 42 and 45 are supported by the support rods 3.
7, the drive arm 49 and the shifter arm 31 are operated via the clutch rod 52 and the brake rod 56 with the rocking of the plates 42 and 45, the parking brake 21 is turned on and off, and the clutch 18 is turned on. It has a structure that can be turned on and off. The shifter arm 31 is biased so as to turn off the parking brake 21 as described later.
The depressing operation of the clutch pedal 19 opposes this urging force.

A parking brake lever 22 for manually operating the parking brake 21 is projected from below the front operation panel 9 so as to be swingable forward and backward.
The parking brake 21 can be arbitrarily operated by an operator irrespective of the operation of the clutch pedal 19.

Next, the structure of the brake rod 56 will be described. As shown in FIG. 4, the brake rod 56 has a slider 57 provided with a connecting pin 58 for connection to the plate 45, which is slidably fitted on the rod 50, and an upper end of the slider 57. A cushion spring 63, which is a compression spring, is externally fitted to the brake rod 56 between the upper end portion of the brake rod 56 and the shifter arm 31 via a bracket 60 provided at the lower end. It is connected to the plate 45 via the slider 57 (the connecting pin 58).

The lower portion of the slider 57 in the brake rod 56 has a male screw structure, and a nut 73 is screwed into the male screw portion 56a. In particular, this is a double nut structure to fix the position of the nut 73. The lower end of the slider 57 is positioned by the nut 73.

As a result, the brake rod 56 is resiliently operated (moved) upward by the upward movement of the slider 57 via the cushion spring 63 and the upper receiving plate 62 positioned at the upper end of the rod 50 by the nut. When the slider 57 moves downward, it operates (moves) downward via a nut 73 which is a receiving (stopper), and operates the shifter arm 31 according to the operation (operation) of the clutch pedal 19.

On the other hand, as shown in FIGS. 2 and 4, the brake rod 56 (rod 50) is located at a substantially intermediate position separated from the crawler traveling device 2 by the brake rod 56.
4, a spring 64, which is a biasing member for biasing the shifter arm 31 downward (in a direction in which the parking brake 21 is swung so that the parking brake 21 is turned off), is attached.
As shown in FIG. 5, a male screw portion 65 having a male screw formed is fixedly provided in a substantially intermediate position of the brake rod 56 over a predetermined range, and one end of the spring 64 is attached to the male screw portion 65. It is supported by the brake rod 56 via the support portion 66 provided.

At this time, the support portion 66 is connected to the male screw portion 6.
5 is composed of a nut 67 screwed to the nut 5 and an arm 68 welded to the nut 67, and the position is fixed (locked) by a lock nut 69 screwed above or below the nut 67 so as to be adjustable in position. . That is, the lock nut 6
By loosening 9 and rotating the rod 50 or the support portion 66 (nut 67), the position of the support portion 66 with respect to the male screw portion 65 is changed, and the position of the support portion 66 is changed by tightening the lock nut 69 again. At the same time, it is fixed at the changed position.

Then, the brake rod 56 (rod 50) is urged downward by the spring 64, and the parking brake 21 (shifter arm 31) is urged in the cutting operation direction as described above, but the rod 50 is urged downward. Because the cushion spring 63 is urged downward,
The cushion spring 63 and the slider 57 are brought into contact with each other via a receiving plate 68 provided between the slider 57 and the cushion spring 63, that is, the clutch pedal 19 is urged to the above-described initial position by the spring 64. You.

At this time, a spring 64 is disposed around the brake rod 56 (substantially at an intermediate position) where there is a relatively large space.
1) and the transmission to the clutch pedal 19 side (slider 57) in a well-balanced manner makes it easy to increase the length of the spring 64 and increase the urging force.
For this reason, in the case of the present embodiment, the urging force of the spring 64 is adjusted such that the receiving plate 68 and the slider 57 always contact when the clutch pedal 19 is not depressed.

Thus, the receiving plate 68 and the slider 5
Since the play of the clutch pedal 19 caused by the separation from the clutch pedal 19 is absorbed, an independent spring or the like for removing the play of the clutch pedal 19 can be eliminated, and the operation mechanism of the parking brake 21 becomes relatively simple. It is configured and cost reduction is achieved.

Further, the spring 64 is used for the brake rod 5
6 and is separated from the crawler traveling device 2 so that the operation of the spring 64 (the rod 5
The bias of the shifter arm 31 and the bias of the clutch pedal 19 via the crawlers 2 are stably performed without being hindered by mud and the like jumped up by the crawler traveling device 2. Further, mud dropping around the crawler traveling device 2 can be easily performed. However, with the above configuration, the width of the transmission 17 can be reduced, and the crawler traveling device 2 can be narrowed.
Can be made larger, so that mud removal or the like can be easily performed.

On the other hand, the length of the brake rod 56 is adjusted via the bracket 60 at the time of error adjustment or disassembly adjustment of the parking brake operating mechanism described above. Sliding the 66 with respect to the brake rod 56 as described above to perform positioning with respect to the rod 50 (changing the position)
Therefore, the biasing force of the spring 64 can be easily adjusted, and the proper biasing force of the spring 64 can be easily maintained, and the fine adjustment of the biasing force based on the operation feeling of the clutch pedal 19 can be easily performed. Can be.

Further, since the angle of the support portion 66 with respect to the brake rod 56 can be adjusted by the above structure,
It is possible to easily adjust a more appropriate angle of the support portion with respect to the spring 64, and it is possible to easily adjust (avoid) contact of the spring 64 with a nearby object.

[0029]

According to the structure of the present invention constructed as described above, the urging means such as the spring for urging the operation shifter in the parking brake is provided by the rod for connecting the clutch pedal side and the parking brake. Since it is attached to the intermediate position and separated from the traveling device, the urging force of the urging means is transmitted to the shifter side and the clutch pedal side in a well-balanced manner, and the operation of the urging means (the shift of the parking brake shifter via the rod) There is an effect that the biasing is performed stably without being hindered by mud or the like jumped up by the traveling device.

Further, since the urging means is arranged around the rod which has a relatively large space, the slider and the rod which transmit the swing of the clutch pedal in the brake application direction to the rod by abutting the rod. , The urging force of the urging means can be easily increased so that the
As a result, the play of the clutch pedal can be eliminated by absorbing the play of the clutch pedal, and the operation mechanism of the parking brake can be simplified.

Further, by providing the rod with a support portion of the urging means for adjusting the urging force of the urging means by adjusting the position with respect to the rod, the length of the rod is adjusted for fine adjustment of the parking brake operation mechanism. Even in this case, by positioning the support portion by sliding the support portion, the biasing force of the biasing means can be easily adjusted by the support portion, and the appropriate biasing force of the biasing means can be easily held.

[Brief description of the drawings]

FIG. 1 is a side view of a combine.

FIG. 2 is a side perspective view of a main part of a clutch pedal portion.

FIG. 3 is a perspective plan view of a main part of a clutch pedal portion.

FIG. 4 is a front view of a brake rod.

FIG. 5 is a cross-sectional view of a main part of a support unit.

[Explanation of symbols]

 2 Crawler traveling device (traveling device) 18 Clutch 19 Clutch pedal 21 Parking brake 24 Transmission case 56 Brake rod (rod) 57 Slider 64 Spring (biasing means) 66 Support portion

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Toshitake Furui 667, Iya-cho, Oizumi-cho, Higashi-Izumo-cho, Yatsuka-gun, Shimane 1 F term in Mitsubishi Agricultural Machinery Co., Ltd. (Reference) 2B076 AA03 DC02 DD01 DD02 3D036 EA01 EA04 EB02 EB15 EC07 EC23

Claims (3)

[Claims] The traveling device (2) performs a disengagement operation of a clutch (18) and an engagement operation of a parking brake (21) provided on a side of a transmission case (24) close to the traveling device (2) at the time of depressing operation. ) Is connected to the clutch (18) and the parking brake (21), and a clutch pedal (19) for connecting / disconnecting the driving force to the parking brake (2) is provided.
(1) A biasing means (64) for biasing the shifter so that the parking brake (21) is turned off and actuated on the side of the operating shifter of (1), wherein the biasing means (64) is provided.
A parking brake operating mechanism in a traveling work vehicle, which is provided at a position away from the traveling device (2) on a rod (56) connecting the clutch pedal (19) side and the parking brake (21). 2. A slider (57) for transmitting the swing of the clutch pedal (19) in the brake-engaging direction to the rod (56) by abutting the rod (56).
6) so as to be slidably attached to the urging means (6).
The parking brake operating mechanism for a traveling work vehicle according to claim 1, wherein the biasing force of (4) is set so that the slider (57) and the rod (56) are always brought into contact with each other. 3. A support portion (66) for supporting the urging means (64) on the rod (56) side is provided slidably attached to the rod (56), and the support portion (66) is provided on the rod (56). 3. The parking brake operation mechanism for a traveling work vehicle according to claim 1, wherein the mechanism adjusts the urging force of the urging means (64) by adjusting the position.