JPS633173B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an operating device for an automatic clutch.

Conventionally, clutches and their release mechanisms have had product variations in their component parts similar to those found in general products, so if used as is, this could hinder the smooth operation of the clutch and lead to various troubles. , it was necessary to add an adjustment mechanism when mounted on the vehicle. Furthermore, since the clutch disk is in frictional contact that repeatedly connects and disconnects, it also wears out, so it is necessary to adjust the release mechanism in response to this wear. In order to eliminate the need for such adjustments, we have previously proposed a release cylinder and adjuster spring that have a piston stroke sufficient to cover product variations and clutch wear. Unlike the automatic wear adjustment device for clutch friction plates described in, for example, Japanese Utility Model Publication No. 45-26493, this has the advantage that it does not require a wear adjustment valve outside the release cylinder. This was similar to the prior art in that the spring force increases as the clutch disc wears, which is detrimental to the life of the disc. Moreover, in the automatic clutch operating device, it is necessary to adapt to the clutch facing state by adjusting the balance between the hydraulic pressure of the servo cylinder and the elastic force of the spring, so a position detector such as a potentiometer is used. It was necessary to adjust the operating position. However, in this case, the accuracy of detecting the clutch stroke is poor because the conventional device cannot effectively use the entire area of the potentiometer installed in the release cylinder, and the resolvability of position detection is poor. Since this is determined by the output from the potentiometer, stopping accuracy varies due to voltage fluctuations, oil temperature, and product errors, resulting in overstroke, deterioration of clutch life, poor disengagement, or insufficient stroke, resulting in poor disengagement and gear grinding. , which caused accelerated wear.

The present invention aims to improve the shortcomings of the conventional and prior art, and its purpose is to reduce product variation and aging by adjusting the volume of working fluid on the clutch operating side when the clutch is engaged. An object of the present invention is to provide an operating device for an automatic clutch that can adjust maladaptive parts of a clutch release mechanism due to wear or the like.

Next, one embodiment of the present invention will be described in detail using the drawings.

The figure shows the structure of the present invention. In the figure, 1 is a servo cylinder, and the cylinder body has a large diameter at the part where the piston 1a makes the connecting/disconnecting stroke l, and the other parts have smaller diameters. This cylinder structure constitutes a stopper that limits the stroke of the piston 1a. Piston 1a provided in the cylinder
A potentiometer 3 is provided at the more protruding tip of the rod, and the potentiometer 3 of the cylinder
A power source 7 is connected to the side via a pressure supply valve 11 on the way.
An oil path F that communicates with the oil tank 8 and an oil path E that communicates with the oil tank 8 via the exhaust pressure valve 12 are provided.
A return spring 2 for pressing the piston toward the potentiometer 3 is provided on the side of the cylinder other than the piston rod side, and a release cylinder 4 has a piston 4a for operating the clutch in the center of the wall surface where the return spring 2 comes into contact with the cylinder. An oil passage C is provided which communicates with one of the two. An oil passage D communicating with the oil passage E is provided between the oil tank 8 and the exhaust pressure valve 12 on the other side of the release cylinder 4, and the oil passage D and the oil passage C are connected to the oil amount adjusting valve 10. communicated by an oil passage having A rod protruding from a piston 4a installed in the release cylinder 4 is arranged so as to come into contact with a release bearing 5 via a link mechanism, actuating a pressure plate 5a to press a clutch disk 6, and to control release. ing. The arrow indicates the movement of the rod, A is the continuation,
B represents a disconnected state. The release cylinder 4 is designed to cover the entire release stroke of this clutch, from a new state to a worn clutch, including product variations.
9 is a control unit which detects the engagement state of the clutch with the potentiometer 3, and also controls the flow rate adjustment valve 10, the supply pressure valve 11 and the exhaust pressure valve 1.
Control 2.

Next, the operation of the embodiment of the present invention will be explained.

Normally, the clutch is in a connected state as shown in the figure, but at this time, the solenoid valves 10 and 12 are open and the solenoid valve 11 is closed, and the release bearing 5 and each piston rod and hydraulic oil are at atmospheric pressure and the clutch's diaphragm spring and servo. It is held in a balanced state with the spring force of the return spring 2 of the cylinder. When disengaging the clutch when changing gears or stopping the vehicle, the control unit 9 controls the exhaust pressure valve 12.
After closing the regulating valve 10, the pressure supply valve 11 is opened to guide pressure oil from the power source 7 to the right oil chamber of the servo cylinder 1. Pressure oil passes through the hydraulic oil sealed between the return spring 2 and both cylinders, and the piston rod, link, and bearing, and moves the piston of the servo cylinder against the spring force of the clutch's diaphragm spring to the piston corresponding to the release stroke of the clutch. It moves to the left by the stroke, then releases the clutch and stops when it hits the cylinder stopper. The amount of movement of the servo cylinder piston is detected by the potentiometer 3, and the clutch disengagement control ends when the pressure supply valve 11 is closed.

Next, when the clutch is engaged at the end of a gear shift or when starting, etc., the pressure supply valve 11 and the adjustment valve 10 remain closed, and the exhaust pressure valve 12 is opened to release the pressure oil sealed in the right oil chamber of the servo cylinder, and the clutch's diaphragm spring and The clutch is returned to the engaged state by the return force of the return spring of the servo cylinder. During this time, by controlling the opening and closing of the exhaust pressure valve 12 according to the value of the potentiometer 3, the engagement state and engagement speed of the clutch can be controlled. It should be noted here that if the regulating valve 10 is opened during clutch operation, the release cylinder hydraulic oil will be released from the oil path D to the tank 8, so the engagement state of the clutch will be independent of the servo cylinder piston and the engagement control will be disabled. It becomes impossible. Therefore, the regulating valve 10 must be closed during clutch operation, and when the piston of the servo cylinder returns to the original engaged state position or the position with the set hysteresis due to the return force of the spring, the final state is closed. Clutch contact control is completed by opening the exhaust pressure valve 12 and opening the regulating valve 10 with the pressure supply valve 11 closed.

By keeping the regulating valve 10 open with the clutch fully engaged as shown in the figure, the amount of oil in the oil passage C is insufficient due to product variations and wear of the gratch disk 6. or in excess;
Oil is supplied or discharged from the oil path D through the oil amount adjustment valve 10. That is, the oil pressure in the oil passage C is set to atmospheric pressure via the oil passage D, and the working fluid volume is adjusted with the piston 1a of the servo cylinder 1 always moving to the right end in the figure when the clutch is engaged. In this way, regardless of variations in the stroke on the release cylinder 4 side, the correspondence between the sliding stroke of the piston 1a of the servo cylinder 1 and the release stroke of the clutch is maintained constant. Therefore, operational inconsistencies due to product variations and wear of the clutch disk 6, etc. are completely corrected, and there is no effect on the servo cylinder 1 in terms of operation.

In addition, in the description of the above embodiment, the oil amount adjustment valve 10 of the oil passage C is communicated with the oil passage D, but the oil passage C
Any mechanism that adjusts the working fluid volume by setting the internal pressure to atmospheric pressure when the clutch is engaged is sufficient, and the mechanism for restricting the piston stroke in the servo cylinder 1 is not limited to the stopper mechanism of the cylinder body itself, but may also be a mechanism that adjusts the working fluid volume. The stroke may be regulated by a discharge valve.

As explained in detail above, the present invention connects a release cylinder to the release bearing of a clutch, and makes it possible to control the sliding stroke of a servo cylinder in response to the release stroke of the clutch, and to control the amount of piston sliding of the servo cylinder. The inside of the oil passage that transmits to the release cylinder is set to atmospheric pressure when the clutch is engaged, and an oil volume adjustment valve is provided to adjust the working fluid volume, which is not necessary in the conventional technology or the prior art. There is no need to adjust the clutch release adjustment mechanism to accommodate product variations or clutch disc wear. Furthermore, since the volume of the working fluid is adjusted, excess or insufficient oil is automatically replenished, and there is no fluctuation in the operating force applied to the clutch disk. It is possible to compensate for constant operation in accordance with

[Brief explanation of the drawing]

The figure is a configuration diagram showing an embodiment of the present invention. 1... Servo cylinder, 2... Return spring, 3... Potentiometer, 4... Release cylinder, 5... Release bearing, 6... Clutch disk,
7... Power source, 8... Oil tank, 9... Control unit, 10... Flow rate adjustment valve, 11... Pressure supply valve, 12... Exhaust pressure valve, C, D, E, F... Oil path, A
…Tsugu, B…Decline.

Claims (1)

[Claims] 1. A release cylinder connected to the release bearing of the clutch, a servo cylinder whose piston stroke corresponds to the release stroke of the clutch, a potentiometer that detects the piston stroke position of this servo cylinder, and a piston slide of the servo cylinder. An operating device for an automatic clutch, comprising: an oil passage that transmits the amount of movement to the release cylinder; and an oil amount adjustment valve that adjusts the volume of working fluid by setting the inside of this oil passage to atmospheric pressure when the clutch is engaged. .