JPH0131784Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application] The present invention relates to a slave cylinder for a clutch that provides smooth starting of a vehicle.

[Conventional technology]

Conventionally, clutch operating mechanisms equipped with this type of function were disclosed in, for example, Japanese Patent Publication No. 38-1510 and Utility Model Publication No. 61-7382.
It is disclosed in the publication No. However, these devices have a configuration in which a bypass passage is provided outside the master cylinder or a delay device is connected in the middle of the piping to throttle the hydraulic passage when the clutch pedal is released, so the configuration is complex and the assembly is complicated. There are disadvantages such as it takes time to attach, requires long piping, and restricts placement on the vehicle.

[Problem that the invention attempts to solve]

SUMMARY OF THE INVENTION An object of the present invention is to provide a clutch slave cylinder which incorporates a mechanism for suppressing the return speed of the piston when the clutch is engaged, in order to simplify the arrangement and assembly in a vehicle.

[Means for solving the problem] In order to achieve the above object, the structure of the present invention is such that a flange is formed on a rod supported on an end wall having an inlet/outlet of a cylinder, and a flange is formed on an end of a piston that fits into the cylinder. A flange is fitted to the cylindrical part to define a damper chamber deep inside, and the flange is equipped with an orifice that connects the entrance and exit to the damper chamber and a check valve that allows flow from the entrance and exit to the damper chamber.

[Effect]

When pressure oil is fed from the master cylinder to the inlet/outlet 10, the oil pressure passes through the passage 19 of the rod 18, opens the check valve 14, and completely disconnects the piston 11 from the damper chamber 22 of the cylindrical portion 37 and the oil chamber 23 of the cylinder. Acting on the area, the piston 11 is pushed and the clutch is disengaged.

When the hydraulic pressure from the entrance/exit port 10 is released, the piston 11 is pushed back by the return spring of the clutch.
Since the check valve 14 is closed, the oil in the damper chamber 22 returns to the inlet/outlet 10 via the orifice 13, thereby suppressing the sudden engagement of the clutch.

[Example of idea]

As shown in FIG. 1, a clutch pedal 1 is rotatably supported by a support shaft 4 on a bracket 7 fixed to the vehicle body, and one end of a rod 21 is connected to an intermediate portion of the clutch pedal 1. The other end abuts against a piston of a master cylinder 2 with a reservoir 9.

When the clutch pedal 1 is depressed against the force of the return spring 8 stretched between the bracket 7 and the clutch pedal 1, the oil filled into the master cylinder 2 from the reservoir 9 is transferred by the piston to the conduit 3. The pressure is fed to the slave cylinder 5 via the push rod 33, and the shift fork 6 is
is driven, the pressure plate pressing the clutch plate against the flywheel in the clutch mechanism is pulled back, and the clutch is disconnected.

Conversely, when the clutch pedal 1 is released, the operating force that was pushing the shift fork 6 is released, and the clutch plate is pressed against the flywheel via the pressure plate by the force of the spring built into the clutch mechanism. The clutch is connected.

According to the present invention, even when the clutch pedal 1 is released, the slave cylinder 5 is slowly returned and the clutch is smoothly connected. For this reason, as shown in FIG. 2, the slave cylinder 5 is constructed by fitting the piston 11 equipped with the seal ring 34 into the cylinder 36 that is integrated with the mounting bracket 27 to open the oil chamber 2.
3 are divided. A push rod 33 is engaged in a recess 38 provided at the outer end of the piston 11.
A dustproof boot 12 is mounted between the push rod 33 and the end of the cylinder 36. The oil chamber 23 is communicated with the inlet/outlet 10 via a passage 35 in the end wall of the cylinder and a through hole 20 which will be described later. The base end flange 18a of the hollow rod 18 is abutted against the entrance/exit port 10, and the O
It is fixed with a cylindrical bolt 16 via a ring 17.

As shown in FIG. 3, the rod 18 has a passage 19 in the center and a plurality of through holes 20 at intervals in the circumferential direction in the base end flange 18a. 10 are communicated.

As shown in FIG.
A damper chamber 22 is defined at the inner depth by inserting the damper chamber 22 . The spring 15 housed in the damper chamber 22 causes the check valve 1 to
4 is pressed to close off the end of the passage 19 of the rod 18. An orifice 1 is provided between the flange 18b provided at the end of the rod 18 and the cylindrical portion 37.
3 is formed.

Next, the operation of the device of the present invention will be explained. As shown in FIG. 2, when the clutch pedal is released, the piston 11 is retracted and abuts against the end wall of the cylinder 36.

Now, when the clutch pedal 1 is depressed, the oil in the master cylinder 2 is forced through the conduit 3 to the inlet/outlet 10 of the slave cylinder 5, and the oil is forced into the passage 1 of the rod 18.
9, the check valve 14 is pushed open against the force of the spring 15, enters the damper chamber 22 of the cylindrical portion 37, and exerts pressure on the piston 11.

It also enters the oil chamber 23 of the cylinder 36 from the inlet/outlet 10 through the through hole 20 and the passage 35, and the piston 11
exert pressure on Therefore, the piston 11 is pushed to the right, the shift fork 6 is driven by the push rod 33, and the clutch is disengaged. When the pressures in the inlet/outlet 10 and the oil chamber 23 become equal, the check valve 14 is pushed back by the force of the spring 15, and the passage 1
9 will be closed.

When clutch pedal 1 is released, as mentioned above,
The rod 21 is returned to the right by the return spring 8 shown in FIG. 1, and the force pushing the piston 11 to the right is released. When the shift fork 6 is pushed back by the spring built into the clutch mechanism, the piston 11
is returned to the left, and the oil in the oil chamber 23 is returned to the entrance/exit 10 via the passage 35 and the through hole 20. However, since the check valve 14 closes the passage 19, the damper chamber 2
2 oil is in the orifice 13, the cylindrical part 37, and the passage 3.
5. The piston 11 is returned to the entrance/exit port 10 through the through hole 20, and the rapid return movement of the piston 11 is suppressed by the fluid resistance of the orifice 13.

In this way, from the damper chamber 22 to the flange 18b
As a result, the sudden return movement of the piston 11 is suppressed by the resistance of the fluid flowing outside the clutch mechanism, and the clutch plate is gently pressed against the flywheel by the pressure plate in the clutch mechanism, achieving smooth connection of the clutch. .

In the embodiment shown in FIG. 4, instead of providing the orifice 13 between the rod 18 and the cylindrical portion 37, the orifice 13 is provided in the check valve.
The sliding portion between the rod 18 and the rod 18 is sealed by an O-ring 39 attached to the outer periphery of the rod 18.

In the embodiment shown in FIG. 5, the rod 18 is made of a shaft having a sufficiently smaller diameter than the cylindrical portion 37 instead of being hollow, and a flange 18b forming the orifice 13 is formed at the tip of the rod 18.
A check valve is provided in which a passage 28 is provided in the flange 18b, and a valve plate 24 made of an elastic material that opens and closes the passage 28 is connected to the end of the flange 18b by a rivet 30.

When the clutch is closed, the valve plate 24 is pushed open by the hydraulic pressure in the cylindrical part 37, and the pressure oil from the inlet/outlet 10 is forced into the damper chamber 22. However, when the clutch is connected, the pressure drop in the cylindrical part 37 causes the valve plate 24 to be pushed open. is closed, the orifice 13 exerts fluid resistance against the volume reduction of the damper chamber 22, and the return speed of the piston 11 is suppressed.

[Effect of idea]

As mentioned above, the present invention forms a flange on the rod supported on the end wall having the entrance and exit of the cylinder,
A flange is fitted to the cylindrical part formed at the end of the piston that fits into the cylinder to partition a damper chamber deep inside, and an orifice connects the entrance and exit to the damper chamber and a check valve that allows flow from the entrance and exit to the damper chamber. is provided on the flange, so when the clutch is shut off, the pressure oil at the inlet and outlet opens the check valve and flows into the damper chamber.
Although it does not exert any drag on the movement of the piston, when the clutch is engaged, the check valve is closed and the oil in the damper chamber is returned to the inlet/outlet via the orifice, which exerts a drag on the piston, suppressing the return speed of the piston. The clutch is connected smoothly. Therefore, even if an inexperienced driver does not gradually release the clutch pedal 1, the clutch will not suddenly engage and the engine will not stop, or an excessive shock will not be applied, and the drive system configuration will be maintained. Damage to components and reduction in service life are prevented.

In this invention, the piston of the slave cylinder has a built-in mechanism that suppresses the speed of the clutch connection operation, so the structure is simple, the component parts can be easily machined, and the arrangement on the vehicle is not restricted. , it is easy to assemble and can be easily implemented without major changes to the conventional clutch operating mechanism.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a general hydraulic clutch operating mechanism, FIG. 2 is a side sectional view of a slave cylinder of a clutch according to a first embodiment of the present invention, and FIG. 3 is a perspective view of a rod in the same device. 4 and 5 are side sectional views of Kratz's slave cylinders according to second and third embodiments of the present invention. 10: Inlet/outlet, 11: Piston, 13: Orifice, 14: Check valve, 15: Spring, 18: Rod, 18b: Flange, 22: Damper chamber, 23:
Oil chamber, 24: valve plate, 36: cylinder, 37: cylindrical part.

Claims (1)

[Scope of utility model registration request] A flange is formed on the rod supported on the end wall having the entrance/exit of the cylinder, and the flange is fitted to the cylindrical part formed at the end of the piston that fits into the cylinder to partition a damper chamber deep inside. A clutch slave cylinder characterized in that the flange is equipped with an orifice that connects the chambers and a check valve that allows flow from the inlet and outlet to the damper chamber.