JPH0840223A - Pedal supporting structure for working vehicle - Google Patents

Abstract

PURPOSE:To arrange a pedal related mechanism in a compact form inside a steering tower by axially supporting the left and right directed supporting shafts on a steering tower, suspendedly supporting the left and right brake prdals at the left and right projection ends, and installing a means for arranging a master cylinder inside the steering tower. CONSTITUTION:The left and right directed supporting shafts 17 are axially supported on a steering tower 12 erected from a steering part floor 10, and the left and right brake pedals 18 and 19 are suspension-supported at the left and right projection ends, Further, inside the steering tower 12, a master cylinder 24 for brake is arranged in the longitudinal direction. Further, an operating arm 21 which is contact-interlocked by a pin 20a with a brake arm 21 which pushing-in and opening operates the master cylinder 24 from the upper is spline- fitted with the inside of the steering tower 12 of the supporting shaft 17, in the swing state interlocked with the left and right brake pedals 18 and 19. Accordingly, the pedal related mechanism is arranged in a compact form inside the steering tower 12, and the rationalization of the space is achieved, and the steering tower floor 10 is held clean.

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 work vehicle such as a wheel loader, a lawn mower, or a rice transplanter.

[0002]

2. Description of the Related Art For example, in a wheel loader disclosed in Japanese Patent Laid-Open No. 4-119939, a brake pedal is arranged so as to penetrate through a floor, rise from below, and
It had a structure that pushes and operates a master cylinder located below the floor.

[0003]

That is, the brake pedal is started up from the mechanical device section arranged below the floor, and the brake-related mechanisms such as the master cylinder are collectively arranged together with other devices to be efficiently arranged. However, since the brake pedal penetrates the floor, mud and water on the floor may drop into the mechanical parts below due to the gap between the brake pedal and the pedal. It could not be sealed. Further, even when the floor is cleaned, dirt and dust may fall from the gap or collect on the pedal portion, which is not preferable in terms of appearance. An object of the present invention is to make it possible to prevent dirt and dust from falling below the floor and to make cleaning easier by devising a support structure for a pedal arranged on the control section floor.

[0004]

In order to achieve the above object, the present invention has an operation pedal in which a left and right supporting shaft is arranged on a control tower standing from a control section floor and can be swung around the supporting shaft. In addition to suspending and supporting the master cylinder in the vertical direction, the master cylinder is installed vertically in the control tower, and the operating member for pushing and opening the master cylinder from above is rocked in conjunction with the operating pedal. It is characterized in that it is supported on the inner part of the control tower in the support shaft.

[0005]

The above-described structure eliminates the pedal through hole on the floor by changing the operation pedal from the floor-standing structure to the hanging structure. That is, since the steering tower is erected on the floor for the steering post for supporting the steering handle, instrument panel, etc., it is possible to easily suspend the operation pedal by supporting the support shaft on the steering tower. be able to. The master cylinder operated by the operation pedal can be stored vertically in the control tower, and the supporting shaft is located relatively upward due to the pedal suspension structure. An operation member for performing an operation can be mounted on the support shaft.

That is, since the pedals can be suspended using the control tower, the floor surface can be made flat without holes and mud and water do not drop below the floor. There is no start up and cleaning is easy. Not only that, but also above the floor surface, and the master cylinder and its operating portion can be arranged 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 an advantage that the degree of freedom in layout of other mechanical devices is increased.

[0007]

As a result, by suspending and supporting the operation pedal by using the control tower, the operation pedal-related mechanism is compactly arranged in the control tower to rationalize the installation space and to keep the floor clean. In addition, a pedal support structure having many advantages such as the possibility of failure of mechanical devices on the floor is reduced.

[0008]

Embodiments of the present invention will be described below with reference to the drawings in the case of a wheel loader which is an example of a work vehicle. A wheel loader is shown in FIG. 1, where 1 is the front fuselage,
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 unit 6, 11 is a steering handlebar, 13
Is a steel plate support frame that stands up from the floor 1,
Reference numeral 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 penetrated through the left and right side walls of a rearwardly open U-shaped support frame 13, and a suspension type left brake pedal 18 is integrally welded to the left protruding end thereof. In addition, a suspension type right brake pedal 19 is spline-fitted to the right protruding end. An operating arm 20 is spline-fitted to the right end of the support shaft 13 inside the support shaft 13, and a brake arm 21 is fitted to the left side of the spline so as to be rotatable relative to the bushing.
An abutment pin 20a capable of abutting and interlocking the brake arm 21 is fixed to a portion in the middle of the longitudinal direction of 0.

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

Further, the support frame 13 has an accelerator pedal 28 arranged further to the right of the right brake pedal 19.
The shaft portion 28a of the shaft is penetratingly supported to the left and right, and the accelerator wire 29 is inserted through the arm 28b fixed to the shaft portion 28a.
And the return spring 30 acts on the arm 28b. Reference numeral 22 is a stopper that acts on the arm 28b. That is, the left and right brake pedals 18, 1
9 and the accelerator pedal 28 are both suspended and supported by the control tower 12, and the surface of the floor 10 is flat and has no pedal hole.

FIG. 7 shows a schematic diagram of a hydraulic operation circuit. Reference numeral 31 is a traveling HST comprising a variable displacement hydraulic pump 31a and a hydraulic motor 31b, and 32 is a hydraulic pump 3.
1a is an operation actuator, 33 is a switching valve for forward / reverse switching, 34 is a negative brake, 35 is an inching clutch, 36 is a controller for power steering, 3
Reference numeral 7 is a steering cylinder for bending the body, 38 is a tilt cylinder, and 39 is a boom cylinder.

The switching valve 33 is switched by a shuttle lever (not shown). In the neutrally operated state, a very small amount of operating oil is supplied to the operation actuator 32 through the orifice in the switching valve 33, and the operating speed is extremely low. It is set to move forward. The inching clutch 35 is composed of a variable orifice capable of communicating the pair of oil supply / drain passages 32a, 32a of the operation actuator 32, and in the disengaged position where it is not operated, the above-mentioned extremely low speed forward state is revealed and operated At the position, each orifice value is set so that the operation actuator 32 is balanced such that the pressures of the pair of oil supply / drain passages 32a, 32a become equal and the hydraulic motor 31a completely stops.

The operation of the brake pedals 18 and 19 will be described. As shown in FIG. 4, when the switching valve 33 is in the neutral operation, the vehicle body is in the open position F in which the brake pedals 18 and 19 are in the free state in which they are not depressed. Moves forward at an extremely low speed, and the pin 20a of the operation arm 20 moves to the brake arm 21.
When the brake pedal 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 the traveling and the first operation position S1 is changed to the take-off position. The negative brake 34 is set to operate when the driver further depresses toward S2.

As shown in FIG. 1, a detection switch (proximity switch) 40 for controlling the attitude of the bucket 41 of the loader device 3 horizontally to the ground is a main body 38 of the tilt cylinder 38.
Further, the detection target member 42 is mounted on the telescopic rod 38a and the expansion target member 42 is mounted on 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 positions. That is, when the bucket 41 shown in FIG. 1 is mounted, the rear bolt fixing holes 43, 43 are used, and as shown in FIG. 6, the front bolt fixing holes 43, 43 are used when the fork 44 is mounted, so that the tilt link Regardless of whether the bucket 41 or the fork 44 has different attachment angle positions, the proximity switch 40 and the detection target member 4
The posture control can be performed in a state where the relative position with respect to 2 does not change. The above-described attitude control of the loader device 3 is a known technique disclosed in Japanese Utility Model Laid-Open No. 4-105147, and further detailed structure and operation description in this specification will be omitted.

[Other Embodiments] As the operation pedal, a brake pedal, a clutch pedal for operating a hydraulic clutch, and the like can be considered.

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 drawings]

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

[Figure 2] Side view of the 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 an accelerator pedal mounting structure.

FIG. 6 is a side view showing a mounting state of the posture detection unit when the fork is mounted.

FIG. 7 is a schematic hydraulic circuit diagram.

[Explanation of symbols]

 10 floor 12 control tower 17 spindle 18 operation pedal 21 operation member 24 master cylinder

Claims (1)

[Claims] 1. A control tower (12) standing on a control section floor (10) is provided with a support shaft (17) facing left and right, and an operation pedal (18) swingable around the support shaft (17). While suspending and supporting the master cylinder (17) on the supporting shaft (17), vertically disposing the master cylinder (24) in the control tower (12), and pushing in and opening the master cylinder (24) from above. The support shaft (17) with the member (21) swinging in conjunction with the operation pedal (18).
A structure for supporting a pedal of a work vehicle which is supported in the inner part of the control tower (12).