JPH07174165A - Clutch operating device - Google Patents

Abstract

PURPOSE:To impede pulsation of an operating fluid by providing a valve device, which inhibits moving the fluid from an operating cylinder to a master cylinder at a prescribed pressure or more to permit reverse action to this moving, be tween the clutch master cylinder and clutch operating cylinder. CONSTITUTION:When a clutch pedal is stepped in, a pressure of operating fluid in a clutch master cylinder M/C is supplied to an O/P side of a clutch operating cylinder via inlet/outlet chambers A, B, to disconnect a clutch. When a fluid pressure of the master cylinder M/C rises to increase a pressure, acting in a difference between pressure receiving areas of large/small diameteric head parts 17, 18 of a piston 15, to a prescribed value against a spring 32, by moving to a side of an outlet 7, a valve seat member 29 is seated in a value element 30A of a valve seat member 30 and closed, to interrupt the inlet/outlet chambers A, B, and moving the pressure fluid from the O/P side of the operating cylinder to a side of the master cylinder M/C is inhibited. Accordingly, transmitting a pulsation of the operating fluid due to mechanical vibration of the clutch can be impeded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch actuating device used in vehicles and the like.

[0002]

2. Description of the Related Art This type of clutch actuating device operates by supplying hydraulic pressure from a clutch master cylinder to a clutch master operating cylinder in response to a driver's depression of a clutch pedal to disengage the clutch in the clutch device. Alternatively, by connecting them, the transmission of the rotational force from the engine of the vehicle to the transmission and the interruption switching are performed.

In such a structure, mechanical vibration may occur on the friction engagement surface of the clutch in the process of disconnecting or connecting the clutch of the clutch device, and this vibration is transmitted to the piston of the clutch operating cylinder. A hydraulic fluid pulsation is generated in the hydraulic chamber in the cylinder. Then, the pulsation generated in the hydraulic pressure of the cylinder is transmitted to the clutch master cylinder through the pipe, and the piston,
There is a problem that the toe board of the vehicle to which the clutch master cylinder is fixed is vibrated via the push rod to generate an abnormal noise.

[0004]

As a means for solving this problem, for example, an actual flat opening 3-365 is provided between the clutch master cylinder and the clutch operating cylinder.
A hydraulic pulsation absorbing device as shown in Japanese Patent Laid-Open No. 96 is arranged so that the rubber spring of the device absorbs the pulsation of the hydraulic fluid to prevent vibration of the toe board of the vehicle and eventually generation of abnormal noise. It is what I did.

However, in the system in which the hydraulic pressure pulsation absorbing device is arranged between the clutch master cylinder and the clutch operating master cylinder, the pulsation of the hydraulic fluid can be absorbed by the rubber spring of the device, but the clutch operating cylinder is depressed when the clutch pedal is depressed. There is a problem in that the amount of liquid consumed for operating is increased.

The present invention has been made to solve this problem, and an object of the present invention is to provide a clutch actuating device which can prevent the pulsation of hydraulic fluid from being transmitted without increasing the amount of liquid consumed. To do.

[0007]

In order to achieve the above object, the clutch actuating device of the present invention comprises:
A valve device is provided between the clutch master cylinder and the clutch operating cylinder so as to close the valve at a predetermined pressure or more, prohibit the liquid movement from the clutch operating cylinder to the clutch master cylinder, and allow the reverse.

According to a second aspect of the present invention, the valve device connects the inlet connected to the clutch master cylinder, the outlet connected to the clutch operating cylinder, the inlet and the outlet so that the inlet side has a large diameter. A stepped hole formed, a piston slidably inserted in the stepped hole, a spring for urging the piston toward the inlet side, and a passage connecting the inlet side and the outlet side of the piston. A valve seat that is provided in the passage, and a valve body that is separated from the valve seat when the piston is on the inlet side and is seated on the valve seat when the piston is on the outlet side. .

[0009]

In the above-mentioned clutch actuating device of the present invention, since the valve device for closing the valve at a predetermined pressure or more is provided between the clutch master cylinder and the clutch operating cylinder, after the clutch operating cylinder is actuated, the predetermined pressure is applied. As described above, the valve device is closed to prohibit the liquid movement from the clutch operating cylinder to the clutch master cylinder, so that the pulsation transmission from the clutch operating cylinder side to the clutch master cylinder side can be performed without increasing the liquid consumption amount. Can be stopped.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a transverse sectional view showing a valve device provided in a clutch actuating device of the present embodiment.

In FIG. 1, reference numeral 2 is a main body of the valve device 1, and a first member 3 and a second member 4 are integrally screwed together with a seal member 5 interposed therebetween.
It has an inlet 6 connected to the / C side (not shown) and an outlet 7 connected to the clutch operating cylinder O / P (not shown) side, and a cylinder hole 8 is formed inside.

The cylinder hole 8 extends from the inlet 6 side to the outlet 7
The diameter gradually decreases toward the large diameter hole portion 9 and the medium diameter hole portion 10
The small-diameter hole portion 11 is a continuous stepped hole, and the large-diameter hole portion 9 communicates with the inlet 6 through the through hole 12, and the small-diameter hole portion 11 communicates with the outlet 7 through the through hole 13. .

A piston 15 is slidably inserted in the cylinder hole 8. The piston 15 has the shaft 16
Is a stepped piston having a large-diameter head portion 17 and a small-diameter head portion 18 respectively projecting in radial directions at both ends of the large-diameter head portion 17, the large-diameter head portion 17 sliding on the medium-diameter hole portion 10 via a sealing material 19. The inlet chamber A is movably fitted to define the inlet chamber A on the bottom 9a side of the large-diameter hole portion 9, and the small-diameter head portion 18 is slidably fitted to the small-diameter hole portion 11 via the seal member 20. The outlet chamber B is defined on the bottom 11a side of the small diameter hole portion 11.

Inside the piston 15, a valve chamber 25 opening to the inlet chamber A, a recess 26 opening to the outlet chamber B, and the valve chamber 2
A passage 28 composed of a through hole 27 that communicates the recess 5 with the recess 5.
The valve seat member 29 is caulked at the open end of the valve chamber 25. A valve member 30 is housed in the valve chamber 25 while being biased toward the valve seat member 29 by a valve spring 31, and a stem 30B extending from a valve body 30A of the valve member 30 has a hole 29a of the valve seat member 29. To allow the valve element 30A to face the valve seat member 29 so that it can be seated. The valve seat member 29 is formed with a radial hole 29b that communicates the hole 29a into which the stem 30B of the valve member 30 is loosely inserted with the inlet chamber A.

Further, the piston 15 has a return spring 32 interposed between the bottom of the recess 26 and the bottom 11a of the small diameter hole 11.
Thus, the end surface of the valve seat member 29 is abutted and engaged with the bottom 9a of the large diameter hole portion 9 by being urged toward the inlet 6 side.

The clutch operating device of this embodiment is constructed as described above. Next, the operation of this clutch operating device will be described.

In FIG. 1, a clutch pedal (not shown) is not depressed and the clutch master cylinder M /
The state where the hydraulic pressure is not generated in the pressure chamber of C is shown.

In this state, when the driver depresses the clutch pedal to raise the hydraulic fluid in the pressure chamber of the clutch master cylinder M / C, the hydraulic pressure is passed through the pipe to the inlet 6
Is supplied to the inside of the inlet chamber A from the inlet 6, and the holes 29b and 29a of the valve seat member 29 and the passage 2 in the piston 15 are supplied.
8, through the outlet chamber B, through the through hole 13 and discharged from the outlet 7, and through the pipe, the clutch operating cylinder O
Is supplied to the / P side and the clutch connection is cut off.

After that, the hydraulic pressure in the pressure chamber of the clutch master cylinder M / C rises, and the pressure receiving area of the large-diameter head 17 of the piston 15 with respect to the inlet chamber A and the small-diameter head of the piston 15 with respect to the outlet chamber B. When the pressure acting on the difference area of the pressure receiving areas of 18 rises to a predetermined value against the spring force of the return spring 32, the piston 15 moves to the outlet 7 side, and the movement of the piston 15 follows the valve seat. The member 29 moves to the outlet 7 side, the valve seat member 29 comes to sit on the valve body 30A of the valve member 30, and the valve opens. As a result, the inlet chamber A and the outlet chamber B are disconnected, the hydraulic pressure supply from the clutch master cylinder M / C to the clutch operating cylinder O / P is blocked, and the clutch master cylinder from the clutch operating cylinder O / P side. Hydraulic pressure transfer to the M / C side is prohibited.

When the driver depresses the clutch pedal, which is depressed to connect the clutch, the hydraulic pressure in the pressure chamber of the clutch master cylinder M / C is rapidly released, and the inlet chamber A is kept in a non-pressure state. Become. Then, the piston 15 is moved to the inlet 6 side by the spring force of the return spring 32, and the valve seat member 29 is separated from the valve body 30A of the valve member 30 to open the valve, as shown in FIG. , Passage 28 in piston 15, holes 29a and 29b of valve seat member 29, inlet 6
The fluid path through the is opened. As a result, the return liquid from the clutch operating cylinder O / P side flows through the passage 28 to the clutch master cylinder M / C side.

As described above, according to this embodiment, the valve device 1 for closing the valve at a predetermined pressure is provided between the clutch master cylinder M / C and the clutch operating cylinder O / P, and When the hydraulic pressure supplied to the clutch operating cylinder P / O exceeds a predetermined pressure, the valve device 1 closes, and the clutch master cylinder M from the clutch operating cylinder O / P side.
Since the movement of the hydraulic fluid to the C / C side is prohibited, the pulsation transmission of the hydraulic fluid to the clutch master cylinder side M / C side due to the mechanical vibration generated in the process of connecting or disconnecting the clutch can be suppressed. It can be prevented without increasing, the vibration of the toeboard of the vehicle is reduced, and thereby the generation of abnormal noise can be reduced.

[0022]

As described in detail above, according to the clutch actuating device of the present invention, a valve device for closing the valve at a predetermined pressure is provided between the clutch master cylinder and the clutch operating cylinder, and the clutch master cylinder is connected to the clutch operating cylinder. When the hydraulic pressure supplied to the operating cylinder exceeds a predetermined pressure, the valve device closes and the movement of hydraulic fluid from the clutch operating cylinder to the clutch master cylinder side is prohibited. It is possible to prevent pulsation transmission of hydraulic fluid to the clutch master cylinder side due to mechanical vibration that occurs, without increasing the amount of liquid consumption, reduce vibration of the toe board of the vehicle, and thereby reduce noise generation. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a valve device of a clutch actuating device as an embodiment of the present invention.

[Explanation of symbols]

 1 Valve Device 6 Inlet 7 Outlet 8 Cylinder Hole (Stepped Hole) 15 Piston 28 Passage 29 Valve Seat Member 30A Valve Body 31 Return Spring

Claims (2)

[Claims] 1. A clutch operating device having a clutch master cylinder for generating hydraulic pressure by a driver's operation and a clutch operating cylinder operated by supplying hydraulic pressure from the clutch master cylinder, wherein the clutch master cylinder and the clutch are provided. A clutch actuating device provided with a valve device that closes the valve with an operating cylinder at a predetermined pressure or more to inhibit liquid movement from the clutch operating cylinder to the clutch master cylinder, and vice versa. 2. The valve device is formed such that an inlet connected to the clutch master cylinder, an outlet connected to the clutch operating cylinder, and the inlet and the outlet are connected to each other so that the inlet side has a large diameter. Stepped holes,
A piston that is slidably inserted into the stepped hole, a spring that biases the piston toward the inlet side, a passage that connects the inlet side and the outlet side of the piston, and a valve seat provided in the passage. And a valve element which is separated from the valve seat when the piston is on the inlet side and which is seated on the valve seat when the piston is on the outlet side.