JPH0512095Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention relates to a brake and accelerator interlocking mechanism for a traveling work vehicle.

(b) Conventional technology Conventionally, there have been attempts to prevent damage to the transmission, to reduce the brake capacity, or to simplify operation.
There is a brake/accelerator interlock mechanism that automatically moves the accelerator to a lower speed when the brake is applied.

For example, Japanese Utility Model Publication No. 59-15709 discloses a configuration in which the accelerator is linked to the low speed side only when the brake pedal is depressed beyond a certain level. This is because when using a so-called side clutch type steering system, it would be even worse if the accelerator were to move toward a lower speed side each time the vehicle is lightly braked during steering.

(c) Problems to be solved by the invention Therefore, in the case of steering operation, such a configuration is not necessary, and above all, the prior art described above does not have a loose mechanism, the first and second
The cylinder mechanism and structure are complex.

(d) Means to solve the problem Therefore, this invention was designed to connect the accelerator lever and brake pedal to the engine throttle lever, so that when the accelerator lever is set to the high speed side, the throttle lever is also set to the high speed side, and the brake pedal In the brake and accelerator interlocking mechanism of the traveling work vehicle, which is linked so that the throttle lever moves to the low speed side when the throttle lever is depressed, a centrifugal clutch is incorporated into the output shaft of the engine to derive driving torque at a rotation speed above a certain level. , an operating arm rotating around a center pin is interposed between the throttle lever, the accelerator lever and the brake pedal, and an operating wire connects the accelerator lever and the throttle lever to one end of the operating arm with an inner wire thereof. By springing the outer wire of the accelerator lever toward the high-speed side of the accelerator lever, and fixing it with a stopper to restrict rotation beyond a certain level, and fixing the operating wire connecting the brake pedal to the other end, the above-mentioned The problem was solved.

(e) Effect When the brake pedal is depressed, the operating arm moves the accelerator lever to the low speed side and disconnects the centrifugal clutch of the engine output shaft, but the operating arm is forced by the spring to move the accelerator lever to the high speed side. Since it is emitted, when you release it, it returns to its original state. On the other hand, since the operating arm is fixed to the operating wire of the accelerator lever, the brake pedal is not affected by the rotating operation of the accelerator lever (the brake does not work).

(f) Example Hereinafter, the case where this invention is applied to a riding mower will be explained with reference to the drawings. Fig. 1 is a side view of the riding mower, and Fig. 2 is an enlarged side view of the main parts. .

First, the riding mower consists of a passenger vehicle device A and a rotary type mowing device B attached to the central lower part of the passenger vehicle device A.

Passenger vehicle device A has an engine 4 and a transmission 5, which are drive sources, mounted on a body frame 3 suspended by front wheels 1 and rear wheels 2 (these are covered with a bonnet 6), and furthermore, Handle 7
and seat 8. Note that the speed is changed by operating the speed change lever 9.

In the grass cutting device B, a circular cutting blade case 10 with an open bottom is suspended at the lower center of the passenger vehicle device A, and a knife-shaped cutting blade driven by the power of the engine 4 described above is housed in the case 10. 11 is accommodated. However, the setting of mowing device B,
Non-setting is controlled by a set lever 12, and its on/off is performed by a reaping lever 13.

Furthermore, in addition to the above, this riding mower also includes a brake pedal 16 that operates a brake lever 14 provided outside the transmission 5 with an operating wire 15;
An accelerator lever 19 and the like are provided to operate the throttle lever 17 of the engine 4 using an operating wire 18, but in this invention, these are configured as follows.

That is, first, a centrifugal clutch 20 of a normal structure is installed on the output shaft of the engine 4, and a driving torque is derived only when the output shaft reaches a certain rotation speed.

Next, brake pedal 16, accelerator lever 1
Center pin 2 is located between 9 and throttle lever 17.
An operating arm 22 that rotates around the accelerator lever 19 is provided at one end of the operating arm 22, and an outer 18a (18b is an inner) of the operating wire 18 on the accelerator lever 19 side.
The spring 23 springs the accelerator lever 19 toward the high-speed side, and the stopper 24 made of a pin or the like restricts rotation beyond a certain level and fixes the brake pedal 19 at the other end (the end opposite to the center pin 21).
The inner 25b (25a is the outer) of the operating wire 25 (separate from the operating wire 15 communicating with the brake lever 14) extending from the brake lever 6 is fixed (see FIG. 2).

As a result, when the accelerator lever 19 is set to a certain high-speed position and the brake pedal position 6 is depressed while mowing work or the like is being done, the movement of the accelerator lever 19 is rotated to apply the brake, and the operation arm Turn 21 clockwise. Then, the outer 18a of the operating wire 18 of the accelerator lever 19 is extended, the accelerator lever 19 and the throttle lever 17 are lowered to the low speed side, and the rotation speed of the engine 4 is lowered, and the centrifugal clutch 20 is disengaged to reduce the output of the driving force. make it cut off. However, when the brake pedal 16 is released, the spring 2
3, etc., the operating arm 22 returns to its original position (at this time, the stopper 24 positions the operating arm 22). On the other hand, when the accelerator lever 19 is operated, its movement acts only on the throttle lever 17 and has no effect on the brake lever 14 or the like.

(g) Effects of the invention Since this invention is as described above,
The following effects can be expected.

First, when applying the brake, the depressing action of the brake pedal 16 is linked to the action of moving the accelerator lever 19 etc. to the low speed side and disengaging the centrifugal clutch 20 of the engine 4.
In addition to not applying unnecessary brake torque to the drive shaft or the like and causing damage, the brake capacity may also be small.

Furthermore, since this eliminates the need for a clutch pedal (clutch lever), etc., which were conventionally required, one lever can be omitted, realizing ease and simplicity of operation.

[Brief explanation of the drawing]

The drawings show a case where this invention is applied to a riding mower, and FIG. 1 is a side view of the riding mower, and FIG. 2 is an enlarged side view of the main parts. (Symbol), 4... Engine, 16... Brake pedal, 17... Throttle lever, 18... Operation wire, 19... Accelerator lever, 20... Centrifugal clutch, 21... Center pin, 22... Operation Arm, 23...spring, 24...stopper,
25... Operation wire.

Claims (1)

[Scope of utility model registration request] In a brake/accelerator interlocking mechanism of a traveling work vehicle, an accelerator lever 19 and a brake pedal 16 are interlocked with a throttle lever 17 of an engine 4, so that when the accelerator lever 19 is moved to the high-speed side, the throttle lever 17 also moves to the high-speed side, and when the brake pedal 16 is depressed, the throttle lever 17 moves to the low-speed side.
A centrifugal clutch 20 that generates a drive torque at a certain rotation speed or more is installed on the output shaft of the throttle lever 17, and an operating arm 22 that rotates around a center pin 21 is interposed between the throttle lever 17 and the accelerator lever 19 and brake pedal 16. One end of the operating arm 22 is connected to the accelerator lever 19 and the throttle lever 17 by its inner wire 18b. The outer wire 18a of the operating wire 18 is resilient toward the high-speed side of the accelerator lever 19 by a spring 23, and is fixed by a stopper 24 so that rotation beyond a certain speed is restricted. The other end is connected to the brake pedal 16.
6 and an operating wire 25 is fixedly attached to link the brake and accelerator of the traveling work vehicle.