JPH06122330A - Travel operation structure for working vehicle - Google Patents

Abstract

PURPOSE:To prevent the dropping of a frame due to an erroneous action of a steering clutch pedal. CONSTITUTION:The travel operation structure of a working vehicle is arranged with steering clutches capable of separately engaging or disengaging the transmission systems to the right and left travel devices and clutch pedals 32, 32 capable of separately disengaging the engaged steering clutches in parallel near a drive section step. The travel operation structure is provided with a balance rocking member 37 interlocked with the depressing actions of the clutch pedals 32, 32 and rocked in opposite directions to allow the clutch disengaging action, and checked with the balance rocking before the clutch disengaging action stroke when both clutch pedals 32, 32 are depressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides steering clutches for intermittent operation of transmission systems for left and right traveling devices, and disengages each steering clutch energized by the clutch. The present invention relates to a traveling operation structure of a work vehicle in which various clutch pedals are arranged in parallel in close proximity to a driving section step.

[0002]

2. Description of the Related Art Conventionally, in the traveling operation structure of a work vehicle, each of the clutch pedals is individually linked to a steering clutch so that each of them can be depressed by itself and the operability is taken into consideration. The left and right pedals were placed close to each other.

[0003]

The steering clutch as described above stops the drive of one of the crawler traveling devices when, for example, in a working vehicle provided with left and right crawler traveling devices, when the machine body is turned. It is provided in order to make a turning turn on the ground, and it is common to operate by depressing only one pedal when turning the aircraft. However, for example, when loading on a transportation vehicle or the like, when moving on a walk board in an inclined posture or when traveling on a slope, the steering clutch pedal is depressed to correct the direction of the aircraft. If you accidentally step on the left and right pedals at the same time, the transmission systems for the left and right traveling devices will both be blocked, the left and right traveling devices will rotate freely, and the aircraft may slide down against the intention of the operator. There is room for The present invention aims to eliminate the above-mentioned problems.

[0004]

According to the characteristic construction of the present invention, in the traveling operation structure for a working vehicle described at the beginning, the clutch pedals are contacted by different depression operations in the middle of the linkage mechanism of the clutch pedals. When the clutch pedals are operated together, the clutch swing operation is allowed to swing in opposite directions, and when the clutch pedals are pressed together, the balance swing is restrained against each other without reaching the clutch disengagement operation stroke. The point is that members are provided.

[0005]

Operation When one of the left and right clutch pedals is stepped on, the balance swing member is also abutted and rotated, and the steering clutch corresponding to the clutch pedal is disengaged. If the left and right clutch pedals are erroneously operated at the same time, both sides of the fulcrum of the balance swinging member are simultaneously brought into contact with each other, so that the balance swinging members act to rotate in opposite directions. The operation system for the directional clutch is also in a state where it does not reach the operation stroke for clutch disengagement.

[0006]

Therefore, the left and right clutch pedals are arranged close to each other, and the maneuverability during normal work is maintained to be good, while the improvement is achieved by adding a simple member. It is possible to prevent the aircraft from slipping down against the driver's intention due to an erroneous operation such as a stepping operation, and to improve the traveling safety.

[0007]

Embodiments will be described below with reference to the drawings. 6 and 7 show a riding-type multipurpose working machine as an example of a working vehicle. This working machine transmits the power from an engine 1 mounted on the rear part of the machine body to a hydrostatic continuously variable transmission 3 via a first transmission belt 2 which also serves as a belt tension type main clutch K, and at the same time, outputs its shift output. A traveling transmission system is configured to supply the left and right crawler traveling devices 5 via 4 to drive the vehicle body, and the working device connection of the front portion of the vehicle body is connected via the second transmission belt 6 and the work clutch 7 in the transmission case 4. A work transmission system is configured to transmit the power of the engine 1 to a power take-off shaft 9 provided in the tool 8, and a working device (for example, a lawn mowing device or the like) not shown is connected to the connecting device 8 to run the machine body. It is structured to be able to work while. The connecting member 8 is configured to be movable up and down around a horizontal axis X by a single-acting hydraulic cylinder 10. Also, the frame 1 fixed to the mission case 4
1, a driver's seat 12 is mounted and supported, and a control post 13 is provided upright in front of the driver's seat 12. A hydraulic pressure for driving the hydraulic cylinder 10 is provided on the side of the hydrostatic stepless transmission 3. The pump 14 is arranged to transmit engine power to the hydraulic pump 14 via the third transmission belt 15.

The crawler traveling device 5 supports the four grounded wheels on the track frame 16 and drives the sprocket 17 at a high position on the lateral side of the mission case 4.
Has been placed. Pivot shaft 18a of the frontmost ground roller 18
Is fixed to a slide frame portion 19 which is inserted into and connected to the track frame 16 so that the slide movement of the track frame 16 can be adjusted forward and backward, and the pivot shafts 20a and 21a of the two grounding wheels 20 and 21 in the front and rear are fixed to the track frame 16. It is fixedly connected to. And, the pivot shaft 22 of the rearmost ground roller 22
As shown in FIG. 5, “a” is configured to be inserted and fitted into a cylindrical boss 23 fixed to the track frame 16, and fixed by bolts via a contact plate 24 so that it can be easily removed.
In this way, the front and rear end wheels 18, which are heavily loaded,
22 is configured to be easily removable.

The main clutch K is biased toward the clutch-engaging side, and is linked so as to be set to the clutch disengaged state by depressing the main clutch pedal 26 provided on the left side of the control section post 13 in the driving section step 25. The work clutch 7 is linked by a work clutch lever 27 provided on the control section post 13 so that the work clutch 7 can be turned on and off via an operation wire. Further, the gear shifting operation of the continuously variable transmission device 3 and the lifting operation of the hydraulic cylinder 10 are linked by a gear shift lever 28 and a lifting lever 29 provided on the control post 13 to form an operating system. is there. Incidentally, in conjunction with the clutch disengagement operation by the main clutch pedal 26,
A contact type interlocking mechanism is provided in the middle of the linkage so that the work clutch 7 is also set in the clutch disengaged state in conjunction with it.

Power transmissions for the left and right crawler traveling devices 5, 5 are provided in the mission case 4 by means of steering clutches 31, 31, which can be intermittently connected to each other.
1, 31 are a pair of left and right steering clutch pedals 32, 32 provided on the right side of the control section post 13 of the driving section step 25.
The cutting operation is configured separately for each. More specifically, as shown in FIGS. 1 to 3, each steering clutch pedal 3
Reference numerals 2 and 32 denote pivot bosses 34 and 34 rotatably fitted on a support shaft 33 which is fixedly extended laterally outward from the frame 11 in a cantilever manner. The inner wires of the operation wires 36, 36 are linked to the swing parts 35, 35 that are integrally fixed, and the other end side of the inner wires is linked to the steering clutches 31, 31, so that the clutch is energized. The steering clutches 31 and 31 can be disengaged by depressing the pedals. And
Below the steering clutch pedals 32, 32, there is provided a balance swinging member 37 for restraining the balance swinging with each other when the clutch pedals 32, 32 are both depressed and operated without reaching the clutch disengagement operation stroke. is there. That is, from the fixed boss 38 fixedly fitted on the support shaft 33 to the intermediate portion of the rotary bosses 34, 34, at the left-right intermediate position of the pedals 32, 32 via the bracket 39, the support shaft 4 is provided on the front side of the machine body.
0 is extended, and a balance swinging member 37, which is freely swingable around the axis Y, is externally fitted to the spindle 40. And
Link rods 32a, 3 of the clutch pedals 32, 32
The notch concave portion 4 is provided at a position where 2a is abutted by the stepping operation.
1 is formed, the balance swing member 37 is in the horizontal neutral position (the state shown in FIG. 4A), the gap between the inner edge of the cutout recess 41 and the link rod 32a is 1. The operation stroke is set so as not to reach the clutch disengaged state, and the pedal on one side is depressed to contact the balance swing member 37 from the state shown in FIG. The stroke is set so that the clutch is disengaged for the first time when it is interlockedly rotated until it comes into contact with the linkage rod 32a of the other pedal in the operated state [Fig.
(See (c)). Therefore, the left and right clutch pedals 32, 3
Even if two are depressed at the same time, each linkage rod 32a,
32a restrains each other, and the operation restraint is performed in a state where the clutch is not disengaged (see FIG. 4B).

It should be noted that reference numerals are added to the claims to facilitate the comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a perspective view of a steering clutch pedal arrangement portion.

FIG. 2 is a side view of a steering clutch pedal arrangement portion.

FIG. 3 is a plan view of a steering clutch pedal arrangement portion.

FIG. 4 is a front view showing an operating state of a steering clutch pedal.

FIG. 5 is a sectional view of a wheel support portion.

FIG. 6 is an overall plan view of the working machine

[Fig. 7] Overall side view of the working machine

[Explanation of symbols]

 5,5 Traveling device 25 Driving step 31,31 Steering clutch 32,32 Clutch pedal 37 Balance swing member

Claims (1)

[Claims] 1. A steering clutch (31) which is capable of intermittent operation of transmission systems for the left and right traveling devices (5), (5).
The clutch pedals (32), (32), which are provided with (31) and are capable of disengaging the respective steering clutches (31), (31) energized by the clutch, are individually set to the driving section step (25). A traveling operation structure for work vehicles arranged in parallel in a close proximity state, wherein each of the clutch pedals (32),
In the middle of the linkage mechanism of (32), each clutch pedal (3
When the respective clutch pedals (32) and (32) are depressed together, the clutch is disengaged by swinging in the opposite directions in contact with each other by the separate depression operations of 2) and (32) to allow the clutch to be disengaged. A traveling operation structure of a work vehicle provided with a balance swinging member (37) for restraining the swinging of the balance from each other without reaching the operation stroke for cutting.