JPS58156727A - Clutch releasing device for vehicle - Google Patents

Abstract

PURPOSE:To unnecessitate manual adjustment by constructing an automatic adjusting mechanism coping with the wear of a clutch disc, in a hydraulic booster. CONSTITUTION:When a clutch pedal 30 has been released, a valve seat member 59 and an input piston 43 are pushed back in the right hand direction with respect to an output rod 45 and a power piston 44 by a pressure within a pressure chamber 56 and a force exerted by a spring 63. By this procedure, the communication area of the annular groove 44e of the power piston 44 and the annular groove 43f of an input piston 43 increases, but the pressure within an operating chamber 47 decreases. Accordingly, by the opening of a valve mechanism 57, the pressure chamber 56 communicates again with a drain chamber 50, and the piston 55 is put into a state where it can be displaced toward the righthand direction within the output rod 45. Therefore, the piston 55 moves back within the output rod in accordance with the wear quantity of the clutch disc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clutch release device for a vehicle.

This is a clutch release device for a vehicle that pushes the release lever of a friction clutch, which is normally engaged by the force of a spring, in the clutch release direction in response to depression of the clutch pedal, and is an open center type hydraulic device that is controlled by the clutch pedal. A system having a hydraulic booster and a transmission mechanism that mechanically transmits the output of the hydraulic booster to a release lever is conventionally known. Release lever of the above transmission mechanism
Manually press #! so that no involuntary Z pressing force is applied to it. This prevents the clutch disc from slipping due to wear.

However, in vehicles such as industrial vehicles that frequently use cow clutches and have severe wear on the clutch disc, the above adjustments must be made frequently, which is a hassle. This can be solved by automating the M adjustment in the above 1, but when using such conventional technology, a master cylinder operated by a hydraulic booster and a release cylinder TI operated by the hydraulic pressure generated by this mask cylinder are provided. Therefore, the device becomes large and expensive.The purpose of the present invention is to eliminate the need for manual adjustment 1k by configuring an automatic adjustment mechanism in the 71 hydraulic pusher to deal with the wear of the clutch disc.
Moreover, it is intended to be smaller and cheaper than when conventional automatic adjustment technology is used.

In order to achieve the above object, the present invention includes a piston sliding plate in the output rond of the hydraulic pusher.
The piston is engaged with the hydraulic booster end of the transmission mechanism, and the pressure chamber formed in the output iron by the piston is connected to the hydraulic booster drain chamber by a passage. In some configurations, a normally open valve is provided to block the passage in conjunction with the operation of either the manual piston or the power piston of the hydraulic booster, when the clutch pedal is depressed. When the normally open valve closes, the pressurizer becomes a closed room, and the output rond and piston are integrated, so the clutch is released. Since the chamber communicates with the drain chamber and can move backward relative to the piston or the output rond, depending on the amount of wear on the clutch disc, the piston is displaced 2n backward within the output rond by the force of the spring of the friction clutch, and the release lever of the friction clutch - Prevents unwanted pressing force from being applied to -vn.

Then, the pressure chamber was completed when the device was installed on the vehicle.
Since the hydraulic booster is an open center type and the working fluid always flows through the drain chamber, the extraction work can be easily accomplished by reciprocating the piston relative to the output rod. First, the embodiments of the present invention will be explained based on the drawings.
To explain one embodiment of the figure, IO is a well-known diamond 7 ram spring type friction clutch that is installed in the vehicle drive system, and is normally engaged by the force of the diamond 7 ram spring, and the release lever 11 is moved by the diaphragm spring. It is released by pushing it to the left against the spring.

The clutch release device 20 connects the clutch pedal 80, the open center type hydraulic booster 40, and the output of the hydraulic booster 40 to the release lever 11 &
: Mechanically transmitted transmission mm70.

The hydraulic booster 40 has a stepped cylinder hole 41'
a fixed housing 42 with a stepped cylinder hole 41;
The large diameter portion 48 & slidably fitted in the small diameter portion 41 a of the large diameter portion 441 on the left side of the large diameter portion 48 & and the large diameter portion 41 b of the stepped cylinder hole 41 &: slidably fitted. The power piston ζ has a diameter portion 44b, and an output rod 45 located on the left side of the power piston. This output rod 45 slidably passes through a plug 46 which is fitted and fixed in the left end opening of the service cylinder hole 41. The annular working chamber 47 on the outer periphery of the power piston 44 is connected to the pump 48 so that the working fluid discharged by the pump 48 flows into it. 481) and the power piston 44 are configured to flow into the drain chamber 50 on the left side of the power piston 44 by the diameter of the control valve 49 that is connected to the power piston 44. The small diameter portion 48b of the human-powered piston 48 is slidably fitted into the inner hole 44c of the power piston 44, and the inner circumference of the power piston 44 is provided with a hole 44 at the fitting portion between the two.
df: An annular groove 44e that communicates with the intermediary actuation chamber 47 is formed, while a hole 48 is formed in the small diameter portion 48b of the manual piston 48.
The annular groove 48f, which communicates with the drain chamber 50 through the 01 hole 48d, the hole 48, the hole 45a, and the hole 45bi, communicates with the annular groove 446 by the leftward movement of the input piston 48 with respect to the power piston 44, that is, by the actuation of the manual piston. The control valve 49 is formed to reduce its area, and thus constitutes a normally open control valve 49. Drain room 50
is connected to reservoir 51 2! A return spring 52 is installed in this drain chamber 50 to bias the output rod 45 to the right. Both ends are defined by a hole 450 of the output lot 45 &: the bin 58. It is communicated with a clutch pedal 80 by an input piston 48 and a rubber shaft 54.

The output rod 45 is hollow according to the present invention, and the right end of the rod 71 of the transmission mechanism 70 and the wp2! A piston 55 is slidably fitted into the piston 5.
A pressure chamber 56 formed within the output rod 45 by the pressure chamber 56 is controlled to be communicated with and shut off from the drain chamber 50 by a normally open valve mechanism 57 disposed within the output lid 45. The valve mechanism 57 is slidably fitted into the large diameter hole 45d of the output rod 45, and is urged rightward by a spring 68.
a case 58, a valve seat body 59 that is slidably fitted into the large diameter hole 451 and the small diameter hole 45 of the output rod 45 and abuts the input piston 48 at the right end, and this valve seat body 59k.
The opening F60 is slidably supported from the T, the valve F60 is placed inside the case 58 and fixed to the rod 60, and the valve body 61 and the rod 60 are biased to the right. T;,・
Due to the weak spring 62, the G hole 6 is inserted into the rod 60.
0a, hole 60b is formed 2! There are n. The spring 68 biases the piston 55t toward the left.

The valve seat body 59 also functions as a reaction force screw. Transmission I! The rod 71 is pivoted to the left end of the rod 71, and by moving the rod 71 to the left, it becomes a fulcrum.
2, a lever 74 that is integrated with this lever 78, and a release bearing that is pushed further to the left. 7b.

The operation of the above-mentioned configuration will be described below.The state shown in FIG. 0 is the state in which the clutch pedal 80 is released.

When the clutch pedal 80 is depressed in the foreshadowed line in the drawing, the input screw 48 of the hydrolink booster 40 is actuated, that is, pushed 75n to the left. Due to the operation of this input piston 48, the valve seat body 59 and case 58 of the valve mechanism 57 are pushed to the left against the spring 68, and the n1 valve body 61 comes into contact with the valve seat body 59, and the G Colorado 60 is in the state shown in the figure. hole 601. The pressure chamber 56, which was communicating with the drain chamber 50 through the hole 60b, is cut off from the drain chamber 50 and becomes a closed chamber.

On the other hand, the power piston 4 is activated by the operation of the input screw 48.
Although the communication area between the annular groove 44 of No. 4 and the annular groove 48f of the input piston 48 decreases, it is after the valve 1157 is closed that this communication area reaches a value that brings about the elevation of the working chamber 47. Input piston 4 after valve *5ssy is closed
8 is possible by sliding the piston 55 to the left with respect to the output rod 45 so as to compensate for the reduced volume of the pressure chamber 56 due to the intrusion of the valve seat body 59 into the pressure ¥56. , Therefore, as the input piston 48 continues to operate, the pressure in the working chamber 47 increases. Working chamber 4
Due to the promotion of the power piston 44, the operating force generated by the power piston 45 is increased. FI: Working fluid in the force chamber 56 is transmitted to the rod 71 via the piston 55. The pressure within the sweat chamber 56 is in response to the actuation force of the power piston 44, and this pressure acts on the valve seat body 59 and causes the valve seat body 5 to
9 and the input piston 48 to the right, and a pedal reaction force is generated there. The input piston 48 slides with respect to the power piston 44 according to the magnitude relationship between this pedal reaction force and the input from the rod 54, and this IL causes the pressure in the J-li 47 to be adjusted to a pressure corresponding to the pedal depression force. After adjustment rL〇, due to the elevation of the working chamber 47, the input piston 48.
Power piston 44/output rod 45° piston 55.
The rod 71 integrally moves to the left, and is pushed to the left against the release bearing 75 or the release lever 1lt of the friction clutch 10 and the diaphragm spring, and the friction clutch 10 is released.

When the clutch pedal that has been depressed is released, the valve seat member 59 and the manual piston 48 are pushed back to the right with respect to the output rod 45 and the power piston 44 by the pressure in the pressure chamber 56 and the spring 68. As a result, the communication area between the annular groove 44 of the power piston 44 and the annular groove 48f of the input piston 48 increases, and the pressure in the working chamber 47 decreases. Afterwards, each component of the transmission mechanism 70 and each component of the hydraulic booster 40 return to the position shown in the figure by the force of the diamond 7 ram spring of the friction clutch IO, the force of the return spring 52, and the force of the spring 68.

Ben l! It opens because the right end of the Sakaki 57G gorod 6o comes into contact with the bottle 58, and the rightward moving end of the bottle 58 with respect to the exit rod 45 is defined, and the valve 81157 opens. The pressure chamber 56 again communicates with the drain chamber 5o, and the screw cylinder 55 is in a state where it can be displaced to the right within the output rod 45.

5(u) Then, the clutch disc of the friction clutch 10 wears out and the release lever 11 is damaged by the release bearing 75.
When the piston 55 &: is pressed to the right through the release bearing 75ρ1 and the rod 71, the piston 55 overcomes the sum of the rightward pressing force or the force of the spring 68 and the sliding resistance of the piston 55. As the release bearing 75 slides to the right within the opening, this prevents the release bearing 75 from pressing the release lever 11 in the release direction with an undesired force.

When the clutch release device 120 is installed in a vehicle, the pressure chamber 56 can be removed by operating the pump 48 and flowing the working fluid through the hydraulic booster 40. #JJ2 is reciprocated within the pressure chamber 56. By this operation, the working fluid enters and exits the pressure chamber 56 through the open valve mechanism 57, and the pressure chamber 56
The air inside the tank is caught up in the flow of working fluid from the pressure chamber 56 to the drain chamber 50 and is discharged to the drain chamber 50, and from the drain chamber 50 to the reservoir 51. A valve mechanism 157 corresponding to the valve mechanism 57 in FIG. 1 is closed in conjunction with the operation of the power piston 144.

Regarding other examples, only the parts that are different from those of the first factor will be explained, and the same parts as those of the 111th factor will be explained by adding 100 to the reference numerals used in FIG. 1. Omitted. In the embodiment shown in FIG. 2, the rightward movement of the output rod 145 within the housing 141 is controlled by a retaining ring 164 fixed to the outer periphery of the left end of the output rod 145.
When n1 power piston 44 assumes the return position, 1llStl is applied between the right end of output rod 145 and power piston 144 as shown in the figure.
is made to occur. Then, the right end of the valve seat body 159 of the valve mechanism 157 contacts the power piston 144,
The input piston 148 and the valve seat body 159 are designed not to come into contact with each other. Further, the return of the input piston l is performed by a spring 165 which is provided on the input piston 148 and the power piston 144i1 and is weaker than the spring 168. In the figure, the gap existing between the right end of the output rod l and the power piston 144 is larger than the ml!It between the valve body 1 (11) and the valve seat body 159. It has a diameter portion 148g.

In the above-described configuration, the manual piston 148 is actuated by depressing the clutch pedal/L180, and the actuation point 1 is activated.
When the pressure of 2r1. Then, the power piston 144 comes into contact with the output shaft. The pressure in the working chamber 1 acts on the left end of the middle diameter portion 148g of the input piston 148 to generate a pedal reaction force δ.

Therefore, the device shown in FIG. 2 can provide the same effect as the device shown in FIG.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of one embodiment of the present invention, and FIG. 2 is a sectional view of another embodiment. 10.110...Friction clutch, 11.111...
Release lever 120, 120...Clutch release device, 80.180...Clutch pedal, 40.14
0...Open center type hydraulic booster, 4
8.148...Input piston, 44.144...Power piston, 45.145...Output lot, 50.
150...Drain Ig, 55.155...Piston, 56.156...Pressure chamber, 57.157...Valve-
婢. Patent applicant Reio Nakai, representative of Aisin@ki Co., Ltd.

Claims (1)

[Claims] A clutch release device for a vehicle that pushes a release lever of a friction clutch, which is normally engaged by the force of a spring, in the clutch release direction in response to M engagement of the clutch pedal, the device being an open center type controlled by the clutch pedal. In a vehicle clutch release device comprising a hydraulic booster and a transmission mechanism that mechanically transmits the output of the hydraulic booster to a release lever, the clutch release device is slidably fitted into the output rod of the hydraulic booster. A piston that has a small diameter and is engaged with the small end of the hydraulic booster of the transmission shaft Sakaki, a pressure chamber formed in the output rond by this piston, and a pressure chamber that is connected to the hydraulic booster in the pressure chamber. A clutch release for a vehicle, comprising a passage communicating with a drain chamber of a hydraulic booster, and a normally open valve that shuts off the passage in conjunction with the operation of any one of an input piston and a power piston of the hydraulic booster. Device.