JPH09269020A - Automatic clutch device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate unbalanceness of amounts of operation oil in automatic and manual operation oil supply mechanisms, prevent abrupt starting at the changeover time from automatic to manual operation, and failure of a slave cylinder due to excessive operation of a clutch pedal in an automatic clutch device which can be manually operated. SOLUTION: A changeover cylinder 30 having a piston 33 which is energized by a spring 32 is arranged between an operation oil passage 9 of a manual operation oil supply mechanism 10 and operation oil passages 16, 23 of an automatic operation oil supply mechanism 21 and a slave cylinder 4. The operation oil pipe passage 9 is connected to the cylinder 30 on the side of the piston 33, while the operation oil pipe passages 16, 23 are connected to the cylinder 30 on the side of the spring 32. A pump pressure governing relief valve 18 is connected across a pipe passage 16 of an the automatic operation oil supply mechanism and an oil tank 11. A stopper 48 is arranged on the slave cylinder 4 for regulating its stroke.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an automatic clutch device for a vehicle which can be operated manually.

[0002]

2. Description of the Related Art An automatic transmission that electronically shifts a transmission electronically according to operating conditions such as engine speed, accelerator opening, vehicle speed, etc., and also controls a vehicle by automatically connecting and disconnecting a mechanical friction clutch. Is well known, and in such an automatic transmission, an automatic transmission of a vehicle in which the mechanical friction clutch can be manually operated is known from, for example, Japanese Utility Model Publication No. 4-8023. That is, the automatic transmission described in the above publication is suitable for starting under special conditions such as starting over obstacles, starting up a steep slope, starting up on a snowy road, etc. such that the friction clutch cannot be connected or disconnected and the vehicle cannot start. Under these special conditions, the automatic clutch control is stopped so that the clutch can be engaged and disengaged by manual operation.This is output to the control system of the automatic transmission during gear shifting. Means for shutting off the clutch actuation signal when the clutch pedal is depressed, a control valve that responds to the clutch pedal and supplies the working fluid to the clutch booster (actuator such as slave cylinder), and selects the working fluid to the booster. It is equipped with a double check valve that feeds the material.

On the other hand, the transmission is manually operated, and only the clutch is basically automatically (automatically) connected / disconnected in accordance with the speed change state and the operating state, which is determined by the driver or automatically. An automatic clutch device as shown in FIG. 3 has been put into practical use, which enables manual operation when operation is impossible. That is, this device
A slave cylinder 4 connected to the upper end of a clutch release fork 3 which rotates about a as a fulcrum and whose lower end pushes the release bearing 2 of the friction clutch 1 and a clutch pedal 5.
Booster mechanism 6 and oil tank 7 that operate by stepping on
A master cylinder 8 and a hydraulic fluid pipe 9 connected to the cylinder 8 for manual operation, and an oil tank 11 and a pipeline 12.
A gear pump 14 driven by a motor 13 and a hydraulic oil line 1 connected to the gear pump 14 via a check valve 15.
6, a relief valve 18 provided in a pipe line 17 extending from between the gear pump 14 and the check valve 15 to the oil tank 11.
And a hydraulic oil supply mechanism 21 for automatic operation, which comprises an electromagnetic valve 20 provided in a return pipeline 19 from the hydraulic fluid pipeline 16 to the oil tank 11, and a switching mechanism for switching between the hydraulic fluid pipelines 9 and 16. It is connected to the slave cylinder 4 via 22 by a pipe line 23. As the switching mechanism 22, for example, an electromagnetic switching valve 22 'as shown in FIG. 4 is used, and the hydraulic oil pipe line 9 of the manual operation hydraulic oil supply mechanism 10 and the automatic operation hydraulic oil supply mechanism 2 are used.
The hydraulic fluid pipe 16 of No. 1 is switched and connected to the slave cylinder 4.

With the above structure, when the operation of the friction clutch 1 is switched from manual operation to automatic operation, for example, the switching mechanism 22 (electromagnetic switching valve 22 ') is manually or automatically switched to the automatic side and the motor is operated. When the gear pump 14 is driven by 13, the hydraulic fluid opens the check valve 15 and enters the slave cylinder 4 in the pipeline 23 through the hydraulic fluid pipeline 16 and the switching mechanism 22 (electromagnetic switching valve 22 '), causing the piston 4a to move. , The clutch release fork 3 is rotated clockwise about the fulcrum a, and the release bearing 2 is pushed to the left to disconnect the friction clutch 1. When the position sensor (not shown) provided in the slave cylinder 4 detects that the piston 4a has moved by a predetermined stroke, the motor 13
To stop the rotation of the pump 14. After turning off the power to the motor 13 and stopping the gear pump 14,
When the solenoid valve 20 is opened while controlling the return speed of the hydraulic oil, the hydraulic oil in the slave cylinder 4 is supplied to the piston 4a via the release bearing 2 and the clutch release fork 3 by the spring in the friction clutch 1. Returning to the oil tank 11 from the pipe 23 and the hydraulic oil pipe 16 through the return pipe 19 and the solenoid valve 20. As a result, the friction clutch 1 becomes "contact".

Similarly, when the switching mechanism 22 is manually or automatically switched to, for example, the manual mode, the switching mechanism 22, that is, the electromagnetic switching valve 22 'is switched to the manual side as shown in FIG. If you step on,
The booster mechanism 6 operates and the piston 8 in the master cylinder 8
3a is moved to the left in FIG. 3, and the hydraulic oil is supplied to the pipeline 2 via the hydraulic fluid pipeline 9 and the switching mechanism 22 (electromagnetic switching valve 22 ').
3, the piston 4a is pushed to the right in FIG. 2, and the clutch release fork 3 is rotated clockwise around the fulcrum a, and the release bearing 2 is pushed to the left to disengage the friction clutch 1. "No". When the clutch pedal 5 is returned, the piston 8a in the master cylinder 8 returns to the right in FIG. 3 by the spring in the cylinder 8 and the booster mechanism 6, and at the same time, the release bearing 2 and the clutch by the spring in the friction clutch 1 are released. Due to the return of the piston 4a via the release fork 3, the hydraulic oil in the slave cylinder 4 is transferred to the pipe line 23.
And it returns via the hydraulic oil pipe line 9 and returns to the oil tank 7 via the master cylinder 8. As a result, the friction clutch 1 becomes "contact".

By the way, it has been found that the one operated by hydraulic oil as shown in FIG. 3 has the following problems when the electromagnetic switching valve 22 'as shown in FIG. 4 is used as the switching mechanism. (1) Imbalance of the amount of hydraulic oil in both hydraulic oil supply mechanisms When the friction clutch 1 is in the "contact" state, that is, the piston 4a of the slave cylinder 4 is at the left end in FIG. When there is no hydraulic oil in the slave cylinder 4, the hydraulic oil does not move between the hydraulic oil supply mechanisms 10 and 21 and no trouble occurs, but when the clutch 1 is "disengaged", that is, the slave cylinder When the piston 4a of the cylinder 4 is at the position shown in FIG. 3 or at the right of FIG. 3 and the switching is performed when the slave cylinder 4 is filled with hydraulic oil, the operation between the hydraulic oil supply mechanisms 10 and 21 is performed. Oil flows back and forth, one of the two oil tanks 7 and 11 overflows, and the other becomes empty.

For example, after depressing the clutch pedal 5 to disengage the friction clutch 1 (at this time, the slave cylinder 4 is filled with hydraulic oil from the oil tank 7), the electromagnetic switching valve 22 'is automatically turned on. When switched, the pipe line 23 connected to the slave cylinder 4 is disconnected from the hydraulic oil pipe line 9 connected to the oil tank 7, and is connected to the return pipe line 19 of the automatic operation hydraulic oil supply mechanism 21. Therefore, in this state, when the solenoid valve 20 is opened as described above, the hydraulic oil in the slave cylinder 4 flows into the oil tank 11 through the return pipe 19 and the friction clutch 1 becomes "contact". This phenomenon means that the hydraulic oil in the oil tank 7 has been returned to the oil tank 11, and if the above operation is repeated many times, the oil tank 7 becomes empty as described above and the oil An event may occur in which the hydraulic oil overflows from the tank 11.

(2) Rapid start of vehicle at the time of switching from automatic operation to manual operation As described above, there is no problem if switching from automatic operation to manual operation is performed when the friction clutch 1 is in the "contact" state. When the clutch 1 is switched to the manual operation by the automatic operation after the clutch 1 is disengaged, the master cylinder 8 and the oil tank 7 are in communication with each other when the clutch pedal 5 is not stepped on. The hydraulic oil in the slave cylinder 4 is supplied to the pipeline 23, the electromagnetic switching valve 2
2 ′ and the hydraulic oil line 9 are all returned to the oil tank 7, and as a result, the friction clutch 1 suddenly becomes “contact”, and if the gear of the transmission is engaged at this time, the vehicle may suddenly start. is there.

Although various measures can be taken to prevent the occurrence of the above situation, modification of the master cylinder 8 is difficult because it is difficult to deal with air bleeding, wear of the clutch, high cost, and the like. It is difficult to integrate the oil tanks 7 and 11 in the oil supply mechanisms 10 and 21 due to the positional restrictions of both. In consideration of the above points and backup in case of failure of the electronic system,
An auto clutch device for a vehicle as shown in FIGS. 5 and 6 has been considered. 5 is provided with a slave cylinder 4 for connecting and disconnecting the friction clutch 1, and to the cylinder 4, an automatic operation hydraulic oil supply mechanism 21 operated by a pump 14 and a manual operation operation operated by a clutch pedal 5. In an automatic clutch device for a vehicle configured to be selectively pipe-connected to an oil supply mechanism 10, a hydraulic oil passage 9 of the manual operation hydraulic oil supply mechanism 10 is provided.
A switching cylinder 30 having a piston 33 urged by a spring 32 on one side of the cylinder 31 between the automatic operation hydraulic oil supply mechanism 21 and the hydraulic oil conduit 23 of the slave cylinder 4. At the same time, the piston 33 side of the cylinder 30 is connected to the hydraulic oil line 9 of the manual operation hydraulic oil supply mechanism 10, and the spring 32 side is operated to operate both the automatic operation hydraulic oil supply mechanism 21 and the slave cylinder 4. The oil pipelines 23 are connected to each other. In FIG. 5, the same reference numerals as those in FIG. 3 represent the same members.

With such a configuration, in the vehicle automatic clutch device of FIG. 5, when the operation of the friction clutch 1 is switched from manual operation to automatic operation, for example,
When the motor 13 is turned on manually or automatically and the gear pump 14 is driven by the motor 13, the working oil opens the check valve 15 and enters the slave cylinder 4 through the working oil pipe line 16 and the pipe line 23 to move the piston 4a. Pushing it to the right in FIG. 4 causes the friction clutch to be “disengaged” via the clutch release fork and the release bearing as described above. At this time, the spring 32 side of the cylinder 31 of the switching cylinder 30 has the same pressure as the inside of the pipe line 16, and the piston 33
There is no problem simply by pressing the one side 31a of the cylinder 31.

After the power supply to the motor 13 is cut off and the gear pump 14 is stopped, the solenoid valve 20 is controlled and opened to adjust the return speed of the hydraulic oil, so that the hydraulic oil in the slave cylinder 4 is stored in the friction clutch 1. By the return of the piston 4a via the release bearing and the clutch release fork by the spring, the pipe line 23 and the hydraulic oil pipe line 16
Then, it returns to the oil tank 11 via the return line 19 and the solenoid valve 20. As a result, the friction clutch 1 becomes "contact".

When switching from the automatic operation to the manual operation, if the clutch pedal 5 is depressed with the power supply to the motor 13 turned off, the piston 8a in the master cylinder 8 is moved leftward in FIG. The oil is press-fitted into the cylinder 31 from one side 31a of the cylinder 31 of the switching cylinder 30 via the hydraulic oil line 9. As a result, the piston 33 moves to the left in the cylinder 31 against the spring 32, and the hydraulic oil on the spring 32 side of the cylinder 31 is pushed out to the hydraulic oil pipe lines 16 and 23. However, since the hydraulic oil line 16 side is shut off by the check valve 15 and the electromagnetic valve 20, almost all of the amount of oil enters the slave cylinder 4 through the line 23 and pushes the piston 4a to the right in FIG.
As a result, the friction clutch is "disengaged" via the clutch release fork and the release bearing as described above.

When the clutch pedal 5 is returned, the piston 8a in the master cylinder 8 returns to the right in FIG. 5 by the spring of the cylinder 8 and the like, and at the same time, the release bearing and the clutch release fork by the spring in the friction clutch 1 are moved. By the return of the piston 4a via the hydraulic fluid, the hydraulic oil in the slave cylinder 4 returns to the cylinder 31 of the switching cylinder 30 via the pipe line 23, and the return hydraulic oil and the spring 32 cause the piston 33 to move to the one side 3
Since it moves to 1a, the piston 33 and the one side 31
The hydraulic oil between the points a returns to the oil tank 7 via the master cylinder 8. As a result, the friction clutch 1 becomes "contact".

In FIG. 6, a switching cylinder designated by reference numeral 40 is provided with a first piston 43 which is pressed by a spring 42 against one end side 41a of the cylinder 41 when the cylinder is not in operation, and a space between the first piston 43 and the first piston 43 is maintained. While the second piston 46 is biased by the spring 45 toward the same piston, the hydraulic oil conduit 16 of the manual operation hydraulic oil supply mechanism 21 is provided on the side of the first piston 43 of the cylinder 41, and both pistons are provided. Four
The hydraulic oil conduit 16 of the hydraulic oil supply mechanism 21 for automatic operation is connected between 3 and 46, and the hydraulic oil conduit 23 of the slave cylinder 4 is further connected to the urging spring 45 side of the second piston 46. The same reference numerals as those in FIGS. 3 and 5 in FIG. 6 denote the same members.

With such a configuration, in the vehicle auto-clutch device of FIG. 6, when the operation of the friction clutch 1 is switched from, for example, manual operation to automatic operation, the motor 13 is turned on manually or automatically, Motor 13
If the gear pump 14 is driven by the
5 is opened and is press-fitted between the pistons 43 and 46 in the cylinder 41 of the switching cylinder 40 via the hydraulic oil line 16.
Both pistons 43 and 46 are pushed. As a result, the second piston 46 moves to the left in FIG. 6 against the spring 45, and the hydraulic oil in the cylinder 41 having the spring 45 is press-fitted into the slave cylinder 4 through the pipe line 23. Therefore, the piston 4a is pushed to the right in FIG. 6, which causes the friction clutch to be "disengaged" via the clutch release fork and the release bearing as described above.

When the power to the motor 13 is cut off, the gear pump 14 is stopped, and the solenoid valve 20 is controlled and opened to adjust the return speed of the hydraulic oil, the hydraulic oil in the slave cylinder 4 flows through the passage 23. After that, it returns to the chamber in which the spring 45 of the cylinder 41 is provided, and the hydraulic oil and spring 45
The second piston 46 moves until it contacts the stopper 44 in FIG. By this, both pistons 43, 4
The hydraulic oil between 6 returns to the oil tank 11 from the hydraulic oil line 16, the return line 19 and the solenoid valve 20. As a result, the friction clutch 1 becomes "contact".

When switching from automatic operation to manual operation, if the clutch pedal 5 is depressed with the power to the motor 13 cut off, the piston 8a in the master cylinder 8 is moved leftward in FIG. Oil is press-fitted into the cylinder 41 from one side 41a of the cylinder 41 of the switching cylinder 40 through the hydraulic oil line 9. As a result, the first piston 43 moves to the left in the cylinder 41 against the spring 42, and the second piston 46 moves to the left in FIG. 6 against the spring 45. The hydraulic oil is press-fitted into the slave cylinder 4 through the pipe line 23. Therefore, the piston 4a is pushed to the right in FIG. 6, which causes the friction clutch to be "disengaged" via the clutch release fork and the release bearing as described above. At this time, the hydraulic oil between the pistons 43 and 46 is also the hydraulic oil line 16
However, the hydraulic oil conduit 16 side is blocked by the check valve 15 and the solenoid valve 20 and does not flow.

When the clutch pedal 5 is returned, the piston 8a in the master cylinder 8 returns to the right in FIG. 6 by the spring of the cylinder 8 and the like, and at the same time, the release bearing and the clutch release fork by the spring in the friction clutch 1 are moved. Due to the return of the piston 4a via the hydraulic cylinder, the hydraulic oil in the slave cylinder 4 returns to the chamber in the cylinder 41 of the switching cylinder 40 in which the spring 45 is provided via the pipe line 23, and the return hydraulic oil and the spring 45 make The piston 46 returns until it contacts the stopper 44, and the first
Since the piston 43 moves to the one side 31a by the hydraulic oil and the spring 42, the hydraulic oil between the first piston 43 and the one side 41a returns to the oil tank 7 via the master cylinder 8. As a result, the friction clutch 1 becomes "contact".

However, in the apparatus shown in FIGS. 5 and 6, when the manual operation is switched while the friction clutch is "disengaged" by the automatic operation as described above, the hydraulic oil in the slave cylinder 4 does not flow anywhere. There is no longer a possibility that the clutch will come off and the clutch will "close" and the vehicle will suddenly start. However, since the slave cylinder 4 is filled with hydraulic oil, the clutch pedal 5 cannot be depressed as it is. In this case, the driver returns the clutch operation to the automatic operation again while the transmission is in the neutral state, turns on the solenoid valve 20 to open the return line 19, and transfers the hydraulic oil in the slave cylinder 4 to the tank 11. After returning it, it was necessary to turn off the solenoid valve 20 and then switch to manual operation again. If the clutch pedal 5 is depressed while the hydraulic oil in the slave cylinder 4 is being returned to the tank 11, the hydraulic oil in the switching cylinders 30 and 40 will escape to the tank 11 together with the hydraulic oil from the slave cylinder 4. There is also a problem. Further, the motor 1
If the motor 3 is left free due to a failure, the manual operation is switched to, the power supply to the motor 13 and the solenoid valve 20 is once cut off, and then only the solenoid valve 20 is turned on to operate in the slave cylinder 4. A complicated operation such as allowing oil to escape to the tank 11 is required, and a driver unfamiliar with the vehicle may not be able to quickly cope with the situation. Incidentally, in the manual operation state, when the friction clutch is "disengaged" by the clutch pedal 5 and then switched to the automatic operation, it is possible to open the solenoid valve 20 to bring the clutch into "engagement". Even if the clutch pedal 5 is released while the automatic operation is switched on, it is possible to keep the clutch "disengaged" by the rotation of the pump 14 by the motor 13.

[0020]

SUMMARY OF THE INVENTION Therefore, the problem to be solved by the present invention is to eliminate the imbalance in the amount of hydraulic oil in both the automatic and manual hydraulic oil supply mechanisms in an automatic clutch device for a vehicle which can be manually operated. , It has a function to prevent sudden start of the vehicle at the time of switching from automatic operation to manual operation, and to return the hydraulic oil accumulated in the slave cylinder to the oil tank by a simple operation of the clutch pedal at the time of switching, and at the same time, the clutch pedal It is an object of the present invention to provide an automatic clutch device for a vehicle, which prevents a slave cylinder from being damaged due to excessive pedaling.

[0021]

An automatic clutch device for a vehicle according to the present invention for solving the above problems includes a slave cylinder for connecting and disconnecting a friction clutch.
A hydraulic oil supply mechanism for automatic operation that is operated by a pump,
An automatic clutch device for a vehicle configured to selectively pipe-connect a hydraulic oil supply mechanism for manual operation, which is operated by a clutch pedal, in an automatic oil pipe line of the hydraulic oil supply mechanism for manual operation and the automatic operation mechanism. A switching cylinder having a piston urged by a spring is arranged on one side of the cylinder between the oil supply mechanism and both operating oil lines of the slave cylinder, and the manual operation is provided on the piston side of the cylinder. Connect the hydraulic oil line of the oil supply mechanism and both the hydraulic oil supply line for the automatic operation and the slave cylinder to the spring side, and adjust the pump pressure of the hydraulic oil supply mechanism for the automatic operation. A relief valve for the automatic operation of the hydraulic oil supply mechanism between the hydraulic oil line and the oil tank. A first invention characterized in that a stopper for restricting a stroke of the cylinder is provided in the cylinder, and a switching cylinder according to the first invention, wherein a spring is pressed to one end side of the cylinder when not in operation. With a piston,
A switching cylinder having a first piston and a second piston biased by a spring in the direction of the first piston while maintaining a gap, and a hydraulic oil line of the hydraulic oil supply mechanism for manual operation on the first piston side of the cylinder. The hydraulic oil pipe of the automatic operation hydraulic oil supply mechanism between the pistons, and the hydraulic oil pipes of the slave cylinder on the biasing spring side of the second piston. A pump pressure adjusting relief valve provided in the hydraulic oil supply mechanism is pipe-connected between the hydraulic oil line of the automatic operation hydraulic oil supply mechanism and the oil tank, and a stopper for restricting the stroke of the cylinder is provided in the slave cylinder. The second invention is provided.

[0022]

1 and 2 show an embodiment of the present invention.
This will be described in more detail. In addition, in FIG. 1 and FIG.
The same reference numerals as those in FIG. 6 denote the same members, and a description thereof will be omitted. In the vehicle auto-clutch device shown in FIGS. 1 and 2, the pump pressure adjusting relief valve 18 provided in the automatic operation hydraulic oil supply mechanism 21 in the vehicle auto-clutch device shown in FIGS. 1 and 2, between the hydraulic oil pipe 16 of the automatic operation hydraulic oil supply mechanism 21 and the oil tank 11, specifically, the return pipe 19 connected to the hydraulic oil pipe 16 The stroke of the piston 4a is regulated by being pipe-connected by a pipe line 47 so as to bypass the electromagnetic valve 20 and in the vicinity of the clutch release fork 3 connected to the tip of the rod 4b of the piston 4a of the slave cylinder 4, for example. A stopper 48 is provided.

In the vehicle automatic clutch device of FIGS. 1 and 2 configured as described above, when the operation of the friction clutch 1 is switched from, for example, manual operation to automatic operation, the motor 13 is manually or automatically operated. Is turned on and the gear pump 14 is driven by the motor 13, the working oil opens the check valve 15 and is sent directly to the slave cylinder 4 through the working oil conduit 16 and the conduit 23 (FIG. 1) or the working oil conduit. After being pressed through 16, the pistons 43, 46 in the cylinder 41 of the switching cylinder 40 are press-fitted to push the pistons 43, 46. As a result, the second piston 46 is moved to the left in FIG. 2 against the spring 45, and the hydraulic oil in the cylinder 41 having the spring 45 is transferred to the slave cylinder 4 through the pipe line 23.
(Fig. 2).

Therefore, the piston 4a is pushed to the right in FIG. 1 and FIG. 2, whereby the friction clutch is "disengaged" via the clutch release fork and the release bearing in the same manner as described above. When the automatic operation is switched to the manual operation as described above in the full state, if the clutch pedal 5 is strongly depressed so that the hydraulic pressure above the set pressure is generated, the piston 8a in the master cylinder 8 is
1 and 2 are moved to the left, and the hydraulic oil flows through the hydraulic oil line 9
Cylinder 3 in the switching cylinders 30 and 40 via
Cylinders 31, 4 from one side 31a, 41a of 1, 41
1 is press-fitted. Thereby, the pistons 33, 43
Moves to the left in the cylinders 31, 41 against the springs 32, 42, and the hydraulic oil on the spring 32 side of the cylinder 31 of FIG. 1 or the hydraulic oil between the first and second pistons 43, 46 of FIG. Through one of the hydraulic oil line 16 and the return line 19
7, the relief valve 18 disposed in the pipe line 47 is opened, and the other return pipe line 19 returns to the tank 11. When the clutch pedal 5 is returned from this state, the friction clutch becomes "contact" for the amount of hydraulic oil returned to the oil tank 11,
Manual operation is possible. When the clutch pedal 5 is strongly depressed, hydraulic oil is further pressed into the slave cylinder 4 via the hydraulic oil pipe 23, and the piston 4a tries to move further in the clutch "disengaged" direction. By restricting the stroke, increase in hydraulic oil in the slave cylinder 4 and damage to the cylinder were avoided.

[0025]

INDUSTRIAL APPLICABILITY The present invention provides a hydraulic oil line for a hydraulic oil supply mechanism for manual operation and both hydraulic oil lines for a hydraulic oil supply mechanism for automatic operation and a slave cylinder in an automatic clutch device for a vehicle that can be manually operated. A switching cylinder having a piston that is biased by a spring is disposed on one side of the cylinder, a hydraulic oil line of the hydraulic fluid supply mechanism for manual operation is provided on the piston side of the cylinder, and a hydraulic fluid line is provided on the spring side. Connect both hydraulic fluid lines for the automatic operation hydraulic fluid supply mechanism and the slave cylinder, and operate the automatic operation hydraulic fluid supply mechanism with the pump pressure adjusting relief valve provided in the automatic operation hydraulic fluid supply mechanism. A first pipe is connected between the oil pipe and the oil tank, and a stopper for restricting the stroke of the cylinder is provided in the slave cylinder. Clearly, the switching cylinder according to the first aspect of the present invention is urged by the spring in the direction of the first piston, which is pressed against the one end side of the cylinder when not in operation by the spring, and while maintaining a distance from the first piston. A switching cylinder having a second piston, a hydraulic oil pipeline of the manual operation hydraulic oil supply mechanism on the first piston side of the cylinder, and a hydraulic oil pipe of the automatic operation hydraulic oil supply mechanism between the two pistons. And a hydraulic oil conduit of the slave cylinder on the biasing spring side of the second piston, and a pump pressure adjusting relief valve provided in the hydraulic oil supply mechanism for automatic operation is operated for automatic operation. A second invention in which a pipe is connected between a hydraulic oil line of an oil supply mechanism and an oil tank, and a stopper for restricting a stroke of the cylinder is provided in the slave cylinder. Since a switching cylinder with a built-in piston is installed instead of the conventional solenoid switching valve, the hydraulic oil pipeline between the automatic and manual hydraulic oil supply mechanism and the slave cylinder does not directly communicate, and the switching cylinder is Therefore, even if the automatic operation and the manual operation are switched at any time, the hydraulic oil returning from the slave cylinder does not flow to either of the hydraulic oil supply mechanisms. The balance of the amount of hydraulic oil in the oil supply mechanism is always maintained, and similarly, the hydraulic oil returned from the slave cylinder flows out to the communicating oil tank, the friction clutch suddenly becomes "contact", and the vehicle rapidly starts. Such a situation does not occur. Also, the pump pressure adjusting relief valve provided in the automatic operation hydraulic oil supply mechanism was connected between the hydraulic oil line of the automatic operation hydraulic oil supply mechanism and the oil tank, so that the slave cylinder was filled with hydraulic oil. In this state, when the automatic operation is switched to the manual operation, by pressing the clutch pedal strongly, the relief valve is opened and the tank returns to the tank. You can change from manual operation to manual operation. Further, since the slave cylinder is provided with a stopper that restricts the stroke of the cylinder, the hydraulic oil is further pressed into the slave cylinder by the strong depression of the clutch pedal, and the hydraulic oil in the slave cylinder increases, and It is possible to prevent the cylinder from being damaged.

[Brief description of drawings]

FIG. 1 is a fluid circuit diagram of an example of an automatic clutch device for a vehicle of the present invention.

FIG. 2 is a fluid circuit diagram of another example of the automatic clutch device for a vehicle of the present invention.

FIG. 3 is an overall view of a conventional vehicle automatic clutch device.

FIG. 4 is a schematic view showing an example of switching means in the vehicle automatic clutch device shown in FIG.

FIG. 5 is a fluid circuit diagram of an example of an automatic clutch device for a vehicle, which is the basis of the present invention.

FIG. 6 is a fluid circuit diagram of another example of the vehicle auto-clutch device which is the basis of the present invention.

[Explanation of symbols] 1 friction clutch 2 release bearing 3
Release fork 4 Slave cylinder 5 Clutch pedal 7,
11 Oil Tank 8 Master Cylinder 9, 16, 23 Hydraulic Oil Pipeline 12, 17, 47 Pipeline 10 Hydraulic Oil Supply Mechanism for Manual Operation 13 Motor 14 Gear Pump 15 Check Valve
18 Relief valve 19 Return line 20 Solenoid valve 21 Automatic operation hydraulic oil supply mechanism 22 Switching mechanism 22 'Electromagnetic switching valve 30, 40
Switching cylinder 31, 41 Cylinder 32, 42, 45 Spring
33 piston 43 first piston 46 second piston 48 stopper.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroyuki Arai 4-1-1 Kamiotanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Transtron Co., Ltd. (72) Innovator Nobuo Sugamura 4-chome, Ueodaanaka, Nakahara-ku, Kawasaki-shi, Kanagawa No. 1 No. 1 within Transtron Co., Ltd.

Claims (3)

[Claims] 1. A slave cylinder for connecting and disconnecting a friction clutch, wherein a hydraulic fluid supply mechanism for automatic operation which is operated by a pump and a hydraulic fluid supply mechanism for manual operation which is operated by a clutch pedal are selectively provided for the cylinder. In an automatic clutch device for a vehicle configured to be capable of pipe connection, between the hydraulic oil line of the manual operation hydraulic oil supply mechanism and both the hydraulic oil lines of the automatic operation hydraulic oil supply mechanism and the slave cylinder, A switching cylinder having a piston urged by a spring is arranged on one side of the cylinder, the hydraulic oil conduit of the hydraulic oil supply mechanism for manual operation is provided on the piston side of the cylinder, and the automatic operation is provided on the spring side. The hydraulic oil supply mechanism and the hydraulic oil pipes of the slave cylinder are respectively connected, and the automatic operation hydraulic oil supply mechanism is connected. A pump pressure adjusting relief valve provided is pipe-connected between a hydraulic oil line of an automatic operating hydraulic oil supply mechanism and an oil tank, and a stopper for restricting a stroke of the cylinder is provided in the slave cylinder. Auto clutch device for vehicles. 2. A slave cylinder for connecting and disconnecting a friction clutch, wherein an automatic operation hydraulic oil supply mechanism operated by a pump and a manual operation hydraulic oil supply mechanism operated by a clutch pedal are selectively provided for the cylinder. In an automatic clutch device for a vehicle configured to be capable of pipe connection, between the hydraulic oil line of the manual operation hydraulic oil supply mechanism and both the hydraulic oil lines of the automatic operation hydraulic oil supply mechanism and the slave cylinder, A switching cylinder having a first piston that is pressed by a spring on one end side of the cylinder when not operating and a second piston that is biased by a spring in the direction of the first piston while maintaining a distance from the first piston is provided. A hydraulic oil line of the hydraulic oil supply mechanism for manual operation is provided on the first piston side of the cylinder, and the automatic operation is provided between the pistons. The hydraulic oil supply line of the hydraulic oil supply mechanism is connected to the biasing spring side of the second piston, and the hydraulic oil supply line of the slave cylinder is connected to the automatic operation hydraulic oil supply mechanism. Is connected to a hydraulic oil line of an automatic operating hydraulic oil supply mechanism and an oil tank, and a stopper for restricting a stroke of the cylinder is provided on the slave cylinder. 3. The automatic clutch device for a vehicle according to claim 2, wherein the switching cylinder is provided with a stopper for the second piston in the cylinder.