JPH0329557Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides an accelerator lever that can freely maintain its operation position throughout its operating range, and an accelerator pedal that operates from the speed set by the accelerator lever to the high speed side. The present invention relates to an accelerator device for a work vehicle that is biased to return to the low speed side.

In such an accelerator device, the engine rotation speed is set to a desired speed using the accelerator lever, and in that state, the engine rotation speed is increased as necessary using the accelerator pedal. Regardless of changes in the operation status of If the vehicle body pitches or rolls due to uneven ground while operating the accelerator pedal, the operator may become distracted by maintaining his or her position and may unnecessarily increase the engine speed to the maximum speed. There was a risk of this happening, and there was room for improvement.

That is, in a combine harvester, for example, an engine rotation speed suitable for reaping work is set using an accelerator lever, and the accelerator pedal is depressed in order to travel on a headland at high speed. and,
If the vehicle body pitches or rolls, the worker will have to stretch his/her legs to maintain his or her position, and at that time, the operator may unnecessarily press the accelerator pedal too much.
There was a risk that dangerous high-speed driving conditions could result.

In addition, conventionally, when the accelerator pedal is depressed to its maximum stroke, the engine rotational speed is increased to the maximum rotational speed, so when driving at low speeds, the speed changes to the high speed side relative to the amount of depression of the accelerator pedal. Since the speed is large, it is difficult to perform fine accelerator operations, and there is also a desire to operate the accelerator with the pedal at low speeds, or when driving at a certain speed or higher, such as when driving on the road. It has not been possible to realize the desire to easily and quickly operate the accelerator to a higher speed than a constant speed using a pedal.

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to prevent unreasonable high speeds even if the accelerator pedal is pressed by mistake during work driving, etc. The object is to be able to change the accelerator operation range of the vehicle, and to perform fine and good accelerator operation using the pedal.

A characteristic configuration of the accelerator device for a work vehicle according to the present invention is that the operation range of each of the accelerator lever and the accelerator pedal is set to a range smaller than the entire gear shifting operation range of the engine, and the gear shifting by the accelerator lever The speed change operation means using the accelerator lever and the speed change operation means using the accelerator pedal are linked so that the speed change operation amount of the engine is determined by the sum of the operation amount and the speed change operation amount using the accelerator pedal. be.

Next, the effects of the above characteristic configuration of the present invention will be described.

That is, the operating ranges of the accelerator lever and the accelerator pedal are set to be smaller than the entire gear shifting operating range of the engine, and the amount of shifting operation by the accelerator lever and the amount of shifting operating by the accelerator pedal are different. Since the speed change operation means using the accelerator lever and the speed change operation means using the accelerator pedal are linked so that the speed change operation amount of the engine is determined by the sum total of When the accelerator pedal is operated to the side, even if the accelerator pedal is operated at its maximum stroke, the engine speed will not be inappropriately increased to a dangerously high speed, improving safety and reducing the amount of accelerator pedal operation. Despite this, the engine rotation speed does not change significantly, making it easy to perform fine accelerator operations, and since the accelerator pedal is used to change the engine rotation speed from the accelerator lever to the higher speed side, it is similar to driving on the road. This has the advantage of being able to operate the accelerator with the pedal after setting the travel speed according to the driving situation, such as when continuing to drive at high speed during work or when continuing to travel at low speed such as when driving for work.

Examples of the present invention will be described below.

The illustrative diagram shows a control unit installed in parallel with a reaping unit A in a combine harvester. A control box 3 equipped with a pair of left and right steering clutch levers 2 is provided in front of a driver's seat 1, and an accelerator lever 4 is a friction plate type control unit. It is pivoted to the side of the control box 3 in a state where it can be held in its entire operating range by a brake 5, and a travel clutch pedal 6 is mounted at the foot of the driver's seat 1.
and an accelerator pedal 7 are arranged in parallel, and the accelerator device will be described in detail below.

The speed regulating lever 8A of the engine 8 is biased back to the idling position N as shown in FIG. They are interlocked and connected via a wire 11. Then, the outer wire 11 of the release wire 11
A is divided at its longitudinal intermediate portion, and an accelerator pedal that is biased back to the low speed side is placed at the divided end position of the outer wire 11A, which is adjacent to the speed regulating lever 8A, among the divided outer wires 11A, 11A. An arm 12 is provided which swings together with the arm 7, and the end of the outer wire 11A of the arm 12 is fixedly attached to the speed regulating lever 8A. The outer wire 11A next to the speed regulating lever 8A is bent by pressing the accelerator pedal 7, and the inner wire 11A is pushed out due to the frictional contact between the outer wire 11A and the inner wire 11B as a result of this bending. Then, the speed regulating lever 8A is pushed toward the engine high speed side, and the inner wire 11B in the outer wire 11A next to the accelerator lever 4, which is fixedly installed at both ends, is bent to an extended state by the amount of the pushing operation. In addition, the engine rotational speed can be set and maintained at a desired speed by the accelerator lever 4 via the inner wire 11B, which is bent and maintained in the outer wires 11A and 11A, and furthermore, by the accelerator pedal 7, accelerator lever 4
It is configured so that it can be operated at a higher speed than the speed set in . Here, the inner wire 11B constitutes a speed change operation means by the accelerator lever 4, and the outer wire portion of the divided outer wire 11A on the speed governor lever side constitutes a speed change operation means by the accelerator pedal 7. It consists of Furthermore, when the accelerator pedal 7 is operated to the maximum stroke while the accelerator lever 4 is operated to the maximum stroke,
In order to operate the speed regulating lever 8A to the maximum stroke, that is, to operate the engine rotation speed to the maximum rotation speed, the amount of shift operation by the lever 4 and the amount of shift operation by the pedal 7, and the correspondence between these shift operation amounts. The length and bending amount of the inner wire 11B and outer wire 11A are determined so that the engine rotational speed is lower than the maximum rotational speed when the accelerator lever 4 is operated to the low speed operation range and the accelerator pedal 7 is operated to the maximum stroke. It is configured so that

A slide-type locking pin 13 that locks and holds the accelerator pedal 7 at or near the maximum stroke is provided in a state where it is elastically biased toward the locking action position, and the locking pin 13 is provided in a non-locking action position. By providing a locking tongue piece 14 that locks and holds the accelerator pedal 7 in a state that locks and releases it as the locking pin 13 rotates, and by holding the accelerator pedal 7 with the locking pin 13, the accelerator lever 4 The configuration is such that the engine rotational speed can be controlled to the maximum rotational speed or a speed close to the maximum rotational speed by operating the engine.

The accelerator device of the present invention can be applied to various operations such as combine harvesters, riding rice transplanters, and transport vehicles.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

The drawings show an embodiment of the accelerator device for a work vehicle according to the present invention, and FIG. 1 is a side view of the front part of the combine;
FIG. 2 is a schematic side view of the accelerator device, and FIG. 3 is a rear view showing the pivot portion of the accelerator pedal. 4... Accelerator lever, 7... Accelerator pedal, 8... Engine, 11A, 11B... Speed change operation means.

Claims (1)

[Scope of utility model registration request] The accelerator lever 4 is provided so as to be able to maintain its operating position throughout its operating range, and
An accelerator device for a working vehicle in which an accelerator pedal 7 operated from the speed set by the accelerator lever 4 to the high speed side is biased back to the low speed side,
The operating ranges of the accelerator lever 4 and the accelerator pedal 7 are set to be smaller than the entire gear shifting operating range of the engine 8, and the amount of shifting operation by the accelerator lever 4 and the gear shifting by the accelerator pedal 7 are set to be smaller than the entire gear shifting operating range of the engine 8. The speed change operation means 1 by the accelerator lever 4 is configured such that the speed change operation amount of the engine 8 is determined by the sum total with the operation amount.
1B and a speed change operation means 11A using the accelerator pedal 7 are linked together.