JPH053777Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The invention consists of a master cylinder device that is driven by the operation of a clutch pedal, and a slave cylinder that is driven by hydraulic pressure from the master cylinder device to connect and disconnect the clutch. The present invention relates to a clutch release hydraulic circuit including a device.

(Prior art) If the clutch is suddenly connected, there is a risk of damaging the clutch, shaft, etc., so conventionally, a fixed orifice was provided at a suitable location in the liquid pipe between the master cylinder device and the slave cylinder device to It had an effect.

(Problem to be solved by the invention) However, in the above-mentioned conventional configuration, the flow path resistance of the hydraulic circuit changes due to changes in the viscosity of the liquid due to temperature changes, so the response time of the clutch changes, causing the clutch to disconnect at low temperatures. There was a problem that the time required for the clutch was long, causing the clutch to slip. Also, the orifice acts as a resistance in the hydraulic circuit, making the clutch pedal heavy when disengaging the clutch.
Particularly at low temperatures, the viscosity of the liquid increases, making the clutch pedal extremely heavy.

(Means for Solving the Problems) The present invention includes a master cylinder device 3 that is driven by the operation of a clutch pedal 1, and a slave cylinder device that is driven by hydraulic pressure from the master cylinder device 3 to connect and disconnect the clutch 10. 7, a valve chamber 17 is provided at an arbitrary position of a liquid pipe line 6 that communicates the liquid chamber 5 of the master cylinder device 3 with the liquid chamber 8 of the slave cylinder device 7, This valve chamber 17
, a valve body 18 that is slidable in parallel to the flow direction of the liquid.
Then, this valve body 18 is connected to the slave cylinder device 7.
A coil spring 20 that biases the valve body 18 toward the slave cylinder device 7 side is provided, and the valve body 18 is provided with a coil spring 20 that biases the liquid from the master cylinder device 3 side to the slave cylinder device 7 side and from the slave cylinder device 7 side to the master cylinder device 3 side. A fixed orifice 21 that allows liquid to pass through, and a check valve 23 that allows liquid to pass only from the master cylinder device 3 side to the slave cylinder device 7 side are provided, and the volume of the valve chamber 17 is The coil spring 2 is set to be approximately equal to or larger than the sum of the volume of the valve body 18 and the volume of the liquid chamber 5 of the master cylinder device 3.
When the viscosity of the liquid increases at low temperatures and the resistance of the liquid flowing through the fixed orifice 21 from the slave cylinder device 7 side to the master cylinder device 3 side becomes excessive, a biasing force of 0 is applied to the valve by hydraulic pressure. This clutch release hydraulic circuit is characterized in that the body 18 is set to move toward the master cylinder device 3 against the biasing force of the coil spring 20.

(Operation) When the clutch is disengaged, liquid flows through the check valve. When the clutch is connected, if the viscosity of the liquid is below a predetermined value, the liquid will flow through the orifice, and if the viscosity of the liquid is higher than the predetermined value at low temperatures, the fluid pressure will increase due to the flow path resistance of the orifice, causing the valve to close. The body is moved by the hydraulic pressure against the urging force of the coil spring, and the liquid in the valve chamber flows into the liquid chamber of the master cylinder device.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2.

FIG. 1 is a schematic configuration diagram of a clutch release hydraulic circuit according to an embodiment of the present invention. Reference numeral 1 denotes a clutch pedal rotatable about an axis 2 along the horizontal direction, and this clutch pedal 1 is a master cylinder device. It is connected to the piston 4 of No. 3 via a piston rod 4a. The liquid chamber 5 of the master cylinder device 3 communicates with the liquid chamber 8 of the slave cylinder device 7 via a liquid line 6, and the piston 9 of the slave cylinder device 7 communicates with a release rod that connects and disconnects the clutch 10 via a piston rod 9a. 11. A liquid tank 12 that communicates with the liquid chamber 5 is attached to the master cylinder device 3. The liquid tank 12 stores liquid such as brake fluid, and the liquid chambers 5 and 8 and the liquid pipe 6 are filled with liquid. are doing. Coil springs 13 are provided in the liquid chambers 5 and 8.
14 have been installed.

As shown in FIG. 2, a valve chamber 17 is provided at an arbitrary position in the liquid conduit 6, and this valve chamber 17 includes the following:
The valve body 18 is aligned in the direction of liquid flow (horizontal direction in Fig. 2).
It is slidably fitted. An annular sealing member 19 is attached to an annular groove formed in the circumferential direction on the outer periphery of the valve body 18, and the valve body 18 is connected to the slave cylinder by a coil spring 20 as an elastic body disposed in the valve chamber 17. It is biased toward the device 7 side (left side in FIG. 2). The valve body 18 is designed to allow liquid to pass both from the master cylinder device 3 side (right side in Fig. 2) to the slave cylinder device 7 side and from the slave cylinder device 7 side to the master cylinder device 3 side. A fixed orifice 21 is formed to allow this, and a through hole 22 is formed that passes through the valve body 18 in parallel to the direction of movement thereof. A check valve 23 is installed that allows liquid to pass only to the slave cylinder device 7 side. The check valve 23 includes a valve body 24 and a coil spring 25 that urges the valve body 24 toward the master cylinder device 3 side. The valve body 1 is located on the slave cylinder device 7 side of the valve chamber 17, that is, on the left side in FIG.
A disk-shaped space 26 is formed adjacent to the cylinder 8 for applying sufficient hydraulic pressure to the cylinder 8 . The volume of the valve chamber 17 is set to be approximately equal to the sum of the volume of the valve body 18 and the volume of the liquid chamber 5 of the master cylinder device 3. When the viscosity becomes higher than a predetermined value and the resistance of the liquid passing through the orifice 21 becomes excessive, the valve body 18 is moved by the coil spring 2 due to the liquid pressure.
It is set to move toward the master cylinder device 3 side against the urging force of 0.

Next, the effect will be explained. When clutch pedal 1 is depressed, clutch pedal 1 moves to the first position around shaft 2.
The piston 4 rotates clockwise in the figure, moves to the left in FIG. 1 against the biasing force of the coil spring 13, and pushes out the liquid in the liquid chamber 5 into the liquid conduit 6. The liquid pushed out from the liquid chamber 5 into the liquid conduit 6 passes through the check valve 23 and the orifice 21 shown in FIG. 2, and flows into the liquid chamber 8. At this time, since the resistance of the check valve 23 is much smaller than the resistance of the orifice 21, most of the liquid flows through the check valve 23. This pushes the piston 9 to the left in FIG. 1, causing the release rod 11 to rotate clockwise in FIG. 1 against the biasing force of the spring of the clutch 10, thereby disengaging the clutch 10. In other words, when the clutch pedal 1 is depressed, the depression force of the clutch pedal 1 and the clutch 1
The spring biasing force of 0 is balanced. As the depression of the clutch pedal 1 is gradually released, the above-mentioned balance is disrupted, and the clutch 10 is gradually connected due to the biasing force of the spring of the clutch 10, and the release rod 11 rotates counterclockwise in FIG. 9 is pushed to the right in FIG. 1 against the biasing force of the coil spring 14. As a result, when the viscosity of the liquid is below a predetermined value, the liquid in the liquid chamber 8 is pushed out into the liquid conduit 6, and this liquid passes through the orifice 21 and flows into the liquid chamber 5. Therefore piston 4
is pushed to the right in FIG. 1, and the clutch pedal 1 is rotated counterclockwise in FIG. 1 to return to its original position.

On the other hand, when the viscosity of the liquid is higher than a predetermined value due to a drop in temperature, the resistance of the liquid that is pressed from the liquid chamber 8 to the liquid pipe line 6 and passes through the orifice 21 becomes excessive, and the liquid pressure on the slave cylinder device 7 side becomes higher. Since this liquid acts on the surface of the valve body 18 on the slave cylinder device 7 side, the valve body 18 moves toward the master cylinder device 3 side against the biasing force of the coil spring 20. As a result, the liquid in the valve chamber 17 is pushed out into the liquid conduit 6 and flows into the liquid chamber 5. Therefore, the piston 4 is pushed to the right in FIG. 1, and the clutch pedal 1 is rotated counterclockwise in FIG. 1 to return to its original position. At this time, the volume of the valve chamber 17 is equal to the volume of the valve body 18 and the master cylinder device 3.
In other words, the volume of the liquid in the valve chamber 17 before the movement of the valve body 18 is set to be approximately equal to the sum of the volume of the liquid chamber 5 after the movement of the valve body 18 is completed. Therefore, by moving the valve body 18, the piston 4 of the master cylinder device 3 is stroked to the right stroke limit in FIG. 1, and the clutch pedal 1 is returned to its original position. be able to.

In this way, when the viscosity of the liquid increases to a predetermined value or more due to a decrease in temperature, the valve body 18 moves due to the liquid pressure and causes the liquid in the valve chamber 17 to flow into the liquid chamber 5 of the master cylinder device 3. Even if the viscosity of the clutch increases, the return of the clutch 10 will not deteriorate and slip will not occur. Furthermore, since liquid flows through the check valve 23 when the clutch is disengaged, the clutch pedal is very light when the clutch is disengaged even at low temperatures.

(Another Example) In the above example, the volume of the valve chamber 17 was set so that the sum of the volume of the valve body 18 and the volume of the liquid chamber 5 was approximately equal. The volume of the valve chamber 17 is not limited to,
Of course, it may be set larger than the sum of the volume of the valve body 18 and the volume of the liquid chamber 5.

(Effects of the invention) As explained above, according to the invention, when the viscosity of the liquid increases to a predetermined value or more due to a drop in temperature, the valve body moves due to the liquid pressure and the liquid in the valve chamber is transferred to the liquid chamber of the master cylinder device. Since the fluid is allowed to flow into the clutch, even if the viscosity of the fluid increases at low temperatures, the clutch will not return poorly and slippage will not occur. Also, since fluid flows through the check valve when the clutch is disengaged, the clutch pedal is very light when disengaging the clutch, even at low temperatures. Since the orifice 21 is always in communication with the valve chamber 17 and the space 26, it has a high vibration damping effect.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a clutch release hydraulic pressure circuit according to an embodiment of the present invention, and FIG. 2 is a sectional view of a main part of the clutch release hydraulic pressure circuit. DESCRIPTION OF SYMBOLS 1...Clutch pedal, 3...Master cylinder device, 5...Liquid chamber, 6...Liquid pipe line, 7...Slave cylinder device, 8...Liquid chamber, 10...Clutch, 17...Valve chamber, 18... Valve body, 20... Coil spring (elastic body), 21... Orifice, 23
……non-return valve.

Claims (1)

[Scope of utility model registration request] The clutch release hydraulic circuit includes a master cylinder device 3 that is driven by the operation of the clutch pedal 1, and a slave cylinder device 7 that is driven by hydraulic pressure from the master cylinder device 3 and connects and disconnects the clutch 10. A valve chamber 17 is provided at an arbitrary position in the liquid conduit 6 that communicates the liquid chamber 5 of the master cylinder device 3 with the liquid chamber 8 of the slave cylinder device 7, and a valve chamber 17 is provided in the valve chamber 17 in parallel with the flow direction of the liquid. A slidable valve body 18 and a coil spring 20 that biases the valve body 18 toward the slave cylinder device 7 side are provided, and the valve body 18 is provided with a coil spring 20 that biases the valve body 18 toward the slave cylinder device 7 side. A fixed orifice 21 that allows liquid to pass both from the slave cylinder device 7 side to the master cylinder device 3 side.
and a check valve 23 that allows liquid to pass only from the master cylinder device 3 side to the slave cylinder device 7 side, and the volume of the valve chamber 17 is determined by the volume of the valve body 18 and the master cylinder device 3 The biasing force of the coil spring 20 is set to be approximately equal to or larger than the sum of the volume of the liquid chamber 5, and the biasing force of the coil spring 20 is set such that when the viscosity of the liquid increases at low temperatures, the fixed orifice 21 is moved toward the slave cylinder device 7 side. The valve body 18 is set to move toward the master cylinder device 3 side against the biasing force of the coil spring 20 due to hydraulic pressure when the resistance of the liquid flowing from the valve body toward the master cylinder device 3 side becomes excessive. A clutch release hydraulic circuit featuring: