JPS5856429Y2 - Clatchia Sister - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clutch device used in bulldozers, forklifts, wheel loaders, and other vehicles, and more particularly to a clutch assist device in which clutch operating force can be assisted by hydraulic pressure.

Clutch assistors in conventional vehicles include those shown in Fig. 1, where a is the clutch pedal, b is the fork, C is the release bearing, d is the release lever, e is the clutch plate, and f is the clutch assistor in Fig. 1. The pressure spring g indicates a return spring.

In such a structure, when the clutch pedal a is depressed, the fork b, release bearing C and release lever d are operated to release the clutch plate e, and the release lever d is operated by:
It depends only on the force applied to clutch pedal a.

Therefore, a large force against the spring f is required to operate the clutch pedal, causing operator fatigue.

An object of the present invention is to provide a clutch assister that reduces clutch depression force and allows light clutch operation.

Therefore, the clutch assister of the present invention includes a piston slidably inserted into a cylinder, a retainer whose base end is connected to this piston and whose tip is connected to a clutch release lever outside the cylinder, and this retainer. a poppet valve provided therein via a pressure spring and capable of opening and closing a communication hole between an operating side oil chamber and a discharge side oil chamber on both sides of the piston;
The poppet is provided with a hydraulic oil circulation system that enters the operating side oil chamber and circulates through the communicating hole and the discharge side oil chamber, and the poppet is configured to keep the communicating hole open when the clutch release lever is not actuated. It is characterized by having a stopper that can engage with the valve.

Hereinafter, a clutch assistor as an embodiment of the present invention will be explained with reference to the drawings. Fig. 2 is a longitudinal cross-sectional view thereof, Fig. 3 is a longitudinal cross-sectional view showing its operating state, and Fig. 4 is a longitudinal sectional view showing its operating characteristics. In the graph, a cylinder 2 serving as a valve body of a clutch assister 1 has a cover 3 at its end screwed with a stop bolt 4 which functions as a stopper, which will be described later, and a piston 5 is fitted into the cylinder 2. has been done.

A poppet valve 6 that can open and close the communication hole 5a in the center of the piston 5 is provided inside the retainer 7 via a pressure spring 8, and the retainer 7 is connected to the piston 5 at its base end.

Further, a hydraulic oil inlet 9 and a hydraulic oil outlet 10 are provided at both ends of the cylinder 2, and a communication hole 5 in the piston 5 is provided.
An oil hole 11 that can communicate with a is formed at the base of the retainer 7.

The tip of the retainer 7 is connected to a clutch release lever 13 via a link 12 outside the cylinder 2, and at the initial stage when operating force is applied to the clutch pedal a and the clutch is released via the fork b and the release bearing C. The clutch release lever 13 is interlocked to pull out the retainer 7.

In the cylinder 2, an operating side oil chamber 14 and a discharge side oil chamber 15 are formed on both sides of the piston 5, and the hydraulic oil in the hydraulic oil circulation system consisting of a hydraulic pump and piping (not shown) is normally supplied to the clutch when the clutch is released. When the lever 13 is not in operation, the hydraulic oil enters the cylinder 2 from the inlet 9 as shown in FIG. through the hydraulic oil outlet 10
It circulates in a way that more of it is excreted.

At that time, the tapered tip 4a of the stop bolt 4 serving as a stopper passes through the communication hole 5a and contacts the poppet valve 6 so that the communication hole 5a can be maintained in an open state.

With the above-mentioned configuration, when the clutch pedal a is depressed to perform a clutch release operation, when the retainer 7 is initially pulled out slightly via the clutch release lever 13 as shown in FIG. 4
The communication hole 5a is closed by the pressing force of the pressing spring 8.

Therefore, the hydraulic oil entering from the hydraulic oil inlet 9 presses and drives the piston 5 while filling the working side oil chamber 14, and the clutch release lever 13 driven via the retainer 7 accordingly acts to release the clutch. It acts on fork b to assist in this.

Note that as the piston 5 moves to the right, the discharge side oil chamber 15
The hydraulic oil inside is discharged from its outlet 10.

In this way, just by lightly pressing clutch pedal a,
Since the clutch assistor 1 of the present invention assists the clutch release action with hydraulic pressure, the operator's effort is significantly reduced.

That is, as shown in FIG. 4, by using the clutch assistor of the present invention, the clutch pedal depression force in the conventional case shown by the broken line A is subtracted by the hydraulic actuation force shown by the broken line B, and the pressure is reduced by the hydraulic pressure force shown by the solid line C. This is how it is reduced.

The hydraulic pressure acting on the piston 5 is set by a pressure spring 8, and when the hydraulic pressure exceeds the set pressure, the poppet valve 6 opens against the pressure spring 8.

The discharged oil is also used to lubricate the clutch.

As detailed above, the clutch assistor of the present invention has an extremely compact structure and can be easily installed in a limited space such as a vehicle. This has the advantage of significantly reducing the clutch pedal depression force that was the cause of this.

[Brief explanation of the drawing]

FIG. 1 is a partial longitudinal sectional view showing the main parts of a conventional clutch structure, and FIGS. 2 to 4 show a clutch assister as an embodiment of the present invention. FIG. 2 is a longitudinal sectional view thereof; Third
The figure is a longitudinal cross-sectional view showing the operating state, and FIG. 4 is a graph showing the characteristics of the action. 1...Clutch assistor, 2...Cylinder, 3...
・Cover, 4...stop bolt as a stopper,
4a... Tip of stop bolt, 5... Piston, 5a... Communication hole, 6... Poppet valve, 7...
・Retainer, 8...pressure spring, 9...hydraulic oil inlet,
10... Hydraulic oil outlet, 11... Oil hole, 12... Link, 13... Clutch release lever, 14... Operating side oil chamber, 15... Discharge side oil chamber, a. ...Clutch pedal, b...fork, C...release bearing.

Claims (1)

[Scope of utility model registration request] A piston that is slidably inserted into a cylinder, a retainer whose base end is connected to the piston and whose distal end is connected to a clutch release lever outside the cylinder, and a retainer that is provided inside the retainer via a pressure spring. A poppet valve that can open and close a communication hole between the working side oil chamber and the discharge side oil chamber on both sides of the piston, and an actuation that enters the working side oil chamber and circulates through the above communication hole and the discharge side oil chamber. A clutch assister comprising an oil circulation system and a stopper that can engage with the poppet valve to keep the communication hole open when the clutch release lever is not activated.