JP3213173B2 - Work vehicle pedal support structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation pedal support structure for a working vehicle such as a wheel loader, a lawn mower, and a rice transplanter.

[0002]

2. Description of the Related Art For example, in a wheel loader disclosed in Japanese Unexamined Patent Publication No. 4-119939, a brake pedal is arranged so as to penetrate a floor and rise up from below the floor.
It had a structure in which a master cylinder located below the floor was pushed.

[0003]

In other words, the brake pedal is started up and deployed from a mechanical device disposed below the floor, so that the brake-related mechanisms such as the master cylinder are collectively disposed together with other devices to efficiently perform the operation. Although it can be laid out, the brake pedal penetrates the floor, so mud and water on the floor may fall to the lower mechanical part from the gap between the through hole and the pedal, completely removing the floor surface. It could not be sealed. Also, when cleaning the floor, dirt and dust may fall from the gap or accumulate on the pedal portion, which is not preferable in terms of aesthetics. An object of the present invention is to make it possible to prevent mud and dirt from falling below the floor and to make it easy to clean by devising a support structure of a pedal arranged on the control floor.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a front side of a control tower erected from a control section floor, and at a position separated from the control section floor by a predetermined distance upward and downward. A support shaft is arranged, and an operation pedal that can swing around the support shaft is suspended and supported by the support shaft, and is disposed on each of the left and right sides of the control tower, and swings in conjunction with the operation pedal.
Operating part supported on the inner part of the control tower of the support shaft
It is pushed into and released from above by the material, and it is in the control tower
Linked with the master cylinder deployed vertically and the operation pedal
To operate the inching clutch
And a small amount of operation from the non-operation position of the operation pedal
Operation by the operation to the first operation position set in the range.
Set the operating clutch so that the
If the operation exceeds the first operation position, the brake operation
Set the aircraft to be braked by the star cylinder
It is characterized in that.

[0005]

In the above construction, the operation pedal is changed from a floor-standing structure to a hanging structure, thereby eliminating the pedal through-hole of the floor. That is, since a control tower is erected on the floor for a steering post or instrument panel for supporting the steering handle, the operating pedal is easily suspended by supporting the support shaft on the control tower. be able to. The vertical operation of the master cylinder operated by the operation pedal enables the master cylinder to be housed in the control tower, and the support shaft is disposed relatively upward by the pedal suspension structure. An operation member for performing an operation can be provided on the support shaft.

That is, since the pedal can be suspended using the control tower, the floor surface can be made flat without holes, so that mud and water can be prevented from falling below the floor. There is no rise and cleaning can be done easily. In addition, the master cylinder and its operation part can be arranged above the floor surface and without being exposed to the outside, and the operation pedal-related parts can be arranged compactly,
As a result, the space below the floor is substantially expanded, which leads to the advantage of increasing the degree of freedom in layout of other mechanical devices.

[0007]

As a result, the operation pedal-related mechanism is suspended and supported by utilizing the control tower, so that the operation pedal-related mechanism is compactly arranged in the control tower, and the floor is easily kept clean while rationalizing the arrangement space. In addition, a pedal support structure having many advantages such as a reduction in the possibility of failure of mechanical devices in the floor is obtained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings for a case of a wheel loader as an example of a work vehicle. FIG. 1 shows a wheel loader, 1 is a front body,
2 is a rear body, 3 is a loader device, 5 is an engine, 6 is a control unit, 8 is a front wheel, and 9 is a rear wheel. FIG. 2 shows a control tower 12 in the control section 6.
Is a support frame made of a steel plate standing upright from the floor 10,
4 is a steering post, 15 is a front cover, and 16 is a rear cover. Next, the mounting structure of each pedal will be described.

As shown in FIGS. 3 to 5, a support shaft 17 is passed through the left and right side walls of a support frame 13 having an open U-shape facing backward, and a suspension type left brake pedal 18 is welded integrally to a left protruding end thereof. At the same time, a suspension type right brake pedal 19 is fitted over the spline outside of the right protruding end. An operation arm 20 is fitted on the right end of the support frame 13 of the support shaft 17 outside the spline, and a brake arm 21 is fitted on the left side of the bush so as to be relatively rotatable.
A contact pin 20a capable of contacting and interlocking with the brake arm 21 is fixed to a portion in the middle of the longitudinal direction of 0.

At the tip of the operation arm 20, an operation wire 23 for inching / disconnecting an inching clutch 35, which will be described later, and a return spring 25 for returning the operation arm 20 upward.
And the operation wire 23 is screwed on a wire bracket 26 fixed to the inner surface of the support frame 13. An operation rod 24a of a brake operation master cylinder 24 is pivotally connected to the tip of the brake arm 21 by a long hole & pin structure, and the master cylinder 24 is bolted to a cylinder bracket 27 fixed to the inner surface of the support frame 13. Have been.

The support frame 13 has an accelerator pedal 28 disposed on the right side of the right brake pedal 19.
The shaft wire 28a is supported to penetrate left and right, and the accelerator wire 29 is connected via an arm 28b fixed to the shaft portion 28a.
Are connected, and the return spring 30 acts on the arm 28b. Reference numeral 22 denotes a stopper acting on the arm 28b. That is, the left and right brake pedals 18, 1
9 and the accelerator pedal 28 are both suspended from and supported by the control tower 12, and the floor 10 has a flat surface and no pedal hole.

FIG. 7 is a schematic diagram of a hydraulic operating circuit, in which reference numeral 31 denotes a traveling HST comprising a variable displacement type hydraulic pump 31a and a hydraulic motor 31b, and 32 denotes a hydraulic pump 3
1a operating actuator, 33 is a switching valve for switching between forward and backward, 34 is a negative brake, 35 is an inching clutch, 36 is a controller for power steering, 3
Numeral 7 is a steering cylinder for bending the body, numeral 38 is a tilt cylinder, and numeral 39 is a boom cylinder.

The switching valve 33 is switched by a shuttle lever (not shown). When the switching valve 33 is in a neutral operation state, a very small amount of operation oil is supplied to the operation actuator 32 through an orifice in the switching valve 33, and an extremely low speed operation is performed. Is set to move forward. The inching clutch 35 is constituted by a variable orifice capable of communicating a pair of oil supply / discharge passages 32a, 32a of the operation actuator 32. In the off position where the operation is not performed, the extremely low speed forward state described above appears, and the operated on At the position, each orifice value is set so that the pressure of the pair of supply / discharge oil passages 32a and 32a becomes equal and the operation actuator 32 is balanced so that the hydraulic motor 31a is completely stopped.

The operation of the brake pedals 18 and 19 will be described. As shown in FIG. 4, when the switching valve 33 is in a neutral operation, the body is in the open position F where the brake pedals 18 and 19 are not depressed. Moves forward at an extremely low speed, and the pin 20a of the operation arm 20 is
When any one of the brake pedals 18 or 19 is depressed by a small amount until just before the first operation position S1 which comes into contact with the upper surface, the inching clutch 35 is operated to stop traveling, and the crossing position from the first operation position S1. The setting is such that the negative brake 34 is activated when the driver further steps toward S2.

As shown in FIG. 1, a detection switch (proximity switch) 40 for controlling the attitude of a bucket 41 of the loader device 3 to the ground level is provided with a main body 38 of a tilt cylinder 38.
a, and the detection target member 42 is attached to the telescopic rod 38b. However, a pair of bolt holes 43, 43 for the telescopic rod 38b of the detection target member 42 are formed at two front and rear locations. That is, when the bucket 41 shown in FIG. 1 is mounted, the bolt holes 43 on the rear side are used, and when the fork 44 is mounted, the bolt holes 43 on the front side are used, as shown in FIG. In the case of the bucket 41 and the fork 44 having different mounting angle positions, the proximity switch 40 and the detection target member 4 are different.
The posture control can be performed in a state where the relative position with respect to the position 2 does not change.

The attitude control of the loader device 3 described above
A known technique disclosed in Japanese Utility Model Laid-Open No. 4-105147.
For the technology, any further detailed structure and
The explanation of the operation is omitted.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a side view of a wheel loader.

FIG. 2 is a side view of a control tower.

FIG. 3 is a partially cutaway rear view showing the internal structure of the control tower.

FIG. 4 is a partially cutaway side view showing the internal structure of the control tower.

FIG. 5 is a partially cutaway side view showing the mounting structure of the accelerator pedal.

FIG. 6 is a side view showing an attached state of a posture detecting unit when a fork is attached.

FIG. 7 is a schematic hydraulic circuit diagram.

[Explanation of symbols]

 Reference Signs List 10 floor 12 control tower 17 support shaft 18 operation pedal 21 operation member 24 master cylinder

Continuation of the front page (56) References JP-A-3-248929 (JP, A) JP-A-60-42146 (JP, A) JP-A-59-223577 (JP, A) JP-A-2-41929 (JP) JP-A-57-22919 (JP, A) JP-A-2-105028 (JP, U) JP-A-63-29616 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB Name) B60T 7/04 B60K 41/24 B62D 49/00

Claims (1)

(57) [Claims] 1. A left-right support shaft is disposed in front of a control tower erected from a control floor and at a position separated from the control floor by a predetermined distance upward, and is swingable around the support shaft. The operation pedal is suspended from and supported by the support shaft, and is disposed on each of the left and right sides of the control tower .
Of the control tower inside the control tower
The push-in and release operation from the
Interlock with the star cylinder and the operation pedal
An operation wire for turning on and off the clutch, and setting the operation pedal in a small operation range from a non-operation position of the operation pedal.
The operation is performed until the first operation position is determined.
Set the clutch to be operated, and
In the case of operation beyond the first operation position, the
Set the aircraft to be braked by the master cylinder
Work vehicle of the pedal support structure you have.