JPH08150852A - Accelerator operation structure for work vehicle - Google Patents

Abstract

PURPOSE: To increase assembling precision of a hand acceleration lever and a foot acceleration pedal, and simplify assembling work in an acceleration operation structure for selectively operating a speed adjusting lever of an engine by the hand acceleration lever or the foot acceleration pedal. CONSTITUTION: A hand acceleration lever 3 is installed on a single acceleration bracket 5 to be freely rotatable about a vertical axial center, and a foot acceleration pedal 4 is installed to freely oscillate about a lateral axial center, and an acceleration operation unit A is composed of the hand acceleration lever 3 and the foot acceleration pedal 4 by linking an operation arm 7 extended from the hand acceleration lever 3 in the diametric direction with an operated arm 4a extended upward from the foot acceleration pedal 4 applied to each other on one side, and the acceleration operation unit A is installed on a car body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work vehicle such as a riding lawn mower or a tractor, and more particularly to a work vehicle in which an engine speed control lever can be selectively operated by a hand accelerator lever or a foot accelerator pedal. Regarding the accelerator operation structure.

[0002]

2. Description of the Related Art Conventionally, in a work vehicle such as a tractor, as shown in Japanese Utility Model Laid-Open No. 55-113629, a hand accelerator lever that is manually operated and further rotated from a position where the hand accelerator lever is rotated. There is a foot accelerator pedal that can raise the pedal, which enables operation of two systems, a hand lever and a foot pedal.

[0003]

Since the hand-type operating mechanism and the foot-type operating mechanism are separately assembled to the machine body so as to link the two, the two are liable to be misaligned. When a mounting error occurs, for example, even if the hand accelerator lever is operated to the idling position or max,
The foot accelerator pedal linked to it does not reach the idling position or max, or conversely, the foot accelerator pedal is operated to the idling position or max before the hand accelerator lever is operated to the idling position or max. Assembling deviation easily occurs, and if the assembling accuracy is improved as a means for eliminating it, the assembling becomes troublesome.

An object of the present invention is to improve the assembling accuracy and simplify the assembling work.

[0005]

The present invention according to claim 1 attaches a hand accelerator lever to one accelerator bracket so as to be rotatable about the axis of the vertical axis and swings a foot accelerator pedal about the axis of the horizontal axis. The hand accelerator lever and the foot accelerator pedal are movably attached, and the operated arm extending upward from the foot accelerator pedal is brought into contact with and linked to the operating arm extending radially from the hand accelerator lever. The accelerator operation unit is configured with a foot accelerator pedal of the accelerator operation unit and the speed governor of the engine are linked through a linkage mechanism, and the foot accelerator pedal is interlocked during the accelerator acceleration operation by the hand accelerator lever, It is configured so that it can be operated independently when accelerating the accelerator with the foot accelerator pedal.

According to the second aspect of the present invention, the operated arm of the foot accelerator pedal is a pedal arm.

[0007]

According to the present invention of claim 1, the hand accelerator lever and the foot accelerator pedal are assembled to one accelerator bracket, and the operation arm on the hand accelerator lever side and the operated arm on the foot accelerator pedal side are provided. Since they are connected to one side and assembled as a unit into the machine body as a whole, an assembly error is less likely to occur in the linkage between the two.

According to the second aspect of the present invention, since the operated arm of the foot accelerator pedal is composed of the pedal arm, the structure is more than that in the case where separate bodies are connected and integrally formed. Can be simplified.

[0009]

According to the first aspect of the present invention, the assembling accuracy of the hand accelerator lever and the foot accelerator pedal for selectively operating the speed regulating lever of the engine is improved, and the speed adjusting position of the hand accelerator lever is improved. And, it is possible to perform a good operation by suppressing the displacement of the speed adjusting position of the foot accelerator pedal. Further, since the hand accelerator lever and the foot accelerator pedal are assembled as a unit, they can be easily assembled to the machine body.

According to the second aspect of the present invention, the operated arm of the foot accelerator pedal is formed of a pedal arm, so that a structure different from that in the case where separate bodies are connected and integrally formed. Can be simplified.

[0011]

Embodiments of the present invention will be described below with reference to a tractor.

As shown in FIG. 1, this tractor includes a diesel engine 2 in an engine hood 1 at the front of the fuselage.
The engine 2 can be selectively operated by a hand accelerator lever 3 and a foot accelerator pedal 4 provided in a control section.

The hand accelerator lever 3 and the foot accelerator pedal 4 are integrally assembled into one accelerator bracket 5 to form a unit, and are attached to the machine body through the accelerator operation unit A.

That is, the hand accelerator lever 3 is
It is attached to the upper surface of the bracket 5 having a substantially U-shape in a front view so as to be rotatable about the axis of the vertical axis via a nut 6 which can be tightened with a constant stroke with respect to the screw shaft 3a at the lower end of the hand accelerator lever 3. , The square shaft portion 3 on the upper surface of the bracket 5
Operation arm 7 and spring washer 8 that project radially in b
Is externally fitted, and is mounted such that the rotational operation position of the lever 3 can be held at an arbitrary operation position by the frictional force of the spring washer 8. On the other hand, in the foot accelerator pedal 4, a pedal arm 4A is fixed to a lateral pin 9 provided on both side surfaces of the bracket 5 so as to be swingable around a lateral axis, and a winding spring 10 is provided.
It is urged to return upwards via. The hand accelerator lever 3 and the foot accelerator pedal 4 operate the foot accelerator pedal 4 interlockingly when the hand accelerator lever 3 accelerates the accelerator, and only the foot accelerator pedal 4 alone when the foot accelerator pedal 4 accelerates the accelerator. In order to be operable, the operated arm 4a extending upward from the pedal arm 4A of the foot accelerator pedal 4 with respect to the operating arm 7 extending radially from the hand accelerator lever 3 is rotated at an increased speed. The accelerator operation unit A is configured as a whole by contacting one end with the end face on the lower side of the direction and linking them together. Then, the accelerator operation unit A configured as described above is mounted on the vehicle body frame F.
It is fixedly connected to the via a bolt 11.

The foot accelerator pedal 4 of the accelerator operation unit A attached to the machine body and the speed control lever 2a of the engine 2 are linked through a link mechanism 12 made of a rod, and the foot accelerator pedal 4 is depressed. Therefore, the speed is increased.

The speed control lever 2a of the engine 2 is constructed so as to be operable within the fuel supply stop position (a), the idling position (b), and the range from the idling position to max (c).

Therefore, the hand accelerator lever 3 is
When it is operated in the clockwise direction about the axis of the vertical axis to the max side, the foot accelerator pedal 4 is moved through the operation arm 7 to m.
It will be operated in conjunction with the ax side. On the other hand, when the foot accelerator pedal 4 is depressed and operated to the max side, only the foot accelerator pedal 4 is operated to the max side. Further, when the hand accelerator lever 3 is in the middle speed position, if the foot accelerator pedal 4 is depressed, it can be operated to the max side.

In this riding lawn mower, as shown in FIG. 5, a control panel 1 forming the rear wall of the engine room.
3 to a frame 14 having a U-shape in a front view, which supports the rear end of the bonnet standing on the body frame F, and hooks 13
The panel portion on the upper surface is fixedly connected to the frame 14 via one bolt 15 through the engagement connection from above via a, and the assembly of the control panel 13 to the vehicle body frame F is facilitated. It's been read.

[Other Embodiment] In the above embodiment, the operated arm of the foot accelerator pedal is illustrated as integrally extending from the pedal arm, but the pedal arm may be provided as a separate body. May be.

The work vehicle may be a lawn mower for riding.

It should be noted that reference numerals are given in the claims for convenience of 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 an overall side view of a tractor.

FIG. 2 is a side view of the accelerator operation unit.

FIG. 3 is a vertical front view of the same part.

FIG. 4 is a plan view of the same.

FIG. 5 is an exploded perspective view of a control panel

[Explanation of symbols]

 2 engine 2a speed control lever 3 hand accelerator lever 4 foot accelerator pedal 4a operated arm 5 accelerator bracket 7 operation arm 12 linkage mechanism A accelerator operation unit

Claims (2)

[Claims] 1. A speed control lever (2a) of an engine (2)
Is an accelerator operating structure of a work vehicle that can be selectively operated by a hand accelerator lever (3) or a foot accelerator pedal (4), and one accelerator bracket (5)
, The hand accelerator lever (3) is rotatably attached around the vertical axis, and the foot accelerator pedal (4) is swingably attached around the horizontal axis. The hand accelerator lever (3) and the foot accelerator pedal (4) and the operated arm (7) extending in the radial direction from the hand accelerator lever (3) and the operated arm (4a) extending upward from the foot accelerator pedal (4) in one-side contact. The accelerator operating unit (A) is configured to be linked to each other, and the foot accelerator pedal (3) of the accelerator operating unit (A) and the speed governing lever (2a) of the engine are linked via the linking mechanism (12), When accelerating the accelerator with the hand accelerator lever (3), the foot accelerator pedal (4) is interlocked, and when the accelerator is accelerating with the foot accelerator pedal (4), it is operated independently. Configured to be capable of working vehicle accelerator operation structure are. 2. The accelerator operating structure for a work vehicle according to claim 1, wherein the operated arm (4a) of the foot accelerator pedal (4) is a pedal arm.