JPH0131783Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a clutch slave cylinder that allows a vehicle to start smoothly.

``Prior Art'' Conventionally, there is a clutch mechanism equipped with this type of function, as shown in Japanese Patent Publication No. 38-1510, but this method requires a bypass passage provided outside the master cylinder, or a clutch mechanism equipped with a clutch pedal. Since the delay device that throttles the hydraulic passage when the valve is released is connected in the middle of the piping, the configuration is complicated, it takes time to assemble, the piping becomes long, and its placement on the vehicle is restricted. There are drawbacks such as.

In addition, as disclosed in Japanese Utility Model Publication No. 1982-7382, there is also a device that has a temperature compensation function for hydraulic oil, but this is also connected in the middle of the piping, has a large shape, and has a large structure. is complicated and takes time to assemble.

``Problem that the invention attempts to solve'' The purpose of the invention is to have a built-in mechanism to suppress the return speed of the piston when the clutch is engaged, and to have a simple structure.
To provide a slave cylinder of a clutch which is easy to assemble and whose placement on a vehicle is not restricted.

"Means for Solving the Problem" In order to achieve the above object, the configuration of the present invention is to fit a stepped cylinder into a stepped piston, provide a pressure oil inlet/outlet in the end wall of the small diameter cylinder, and A throttle passage is formed between the circumferential surface and the outer circumferential surface of the small-diameter piston, and the flow of pressure oil from the inlet/outlet to the large-diameter cylinder is allowed to flow into the passage that communicates the inlet/outlet formed inside the small-diameter piston with the large-diameter cylinder. It is equipped with a check valve that allows

"Operation" When pressure oil is supplied from the master cylinder to the inlet/outlet port 19, the pressure oil acts on the stepped piston and pushes it. At this time, pressure oil flows from the axial passage 18 to the valve body 1.
3 is pushed open and enters the large diameter cylinder 20 via the radial passage 17, and the clutch is closed with a large actuating force and rapid action.

On the other hand, when the hydraulic pressure from the inlet/outlet 19 is released, the stepped piston is returned by the return spring of the clutch mechanism. At this time, since the check valve is closed, when the small diameter piston 36 is pushed into the small diameter cylinder 16,
The oil in the large diameter cylinder 20 returns to the inlet/outlet 19 through the gap between the small diameter cylinder 16 and the small diameter piston 36. Between the small diameter cylinder 16 and the small diameter piston 36
The throttling effect in between reduces the return speed of the stepped piston and achieves smooth clutch engagement.

``Embodiment of the invention'' As shown in FIG. 1, a clutch pedal 1 is rotatably supported by a support shaft 22 on a bracket 7 fixed to the vehicle body side, and one end of a rod 23 is attached to an intermediate portion of the clutch pedal 1. are connected, and the other end of the rod 23 abuts against the piston of the master cylinder 2, which is provided with a reservoir 35.

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 in the master cylinder 2 from the reservoir 35 is transferred to the conduit 3 by the piston. is sent under pressure to the slave cylinder 5 through
Shift fork 6 known from Pushrod 9
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, and the clutch plate is pressed against the flywheel via the pressure plate. is connected.

According to the present invention, even if the clutch pedal 1 is suddenly released, the slave cylinder 5 is slowly returned and the clutch is smoothly connected. For this reason, as shown in FIG.
A stepped piston having a small-diameter piston 36 is fitted therein, and an inlet/outlet 19 connected to the aforementioned conduit 3 is provided at the end of the small-diameter cylinder 16 .

Large diameter piston 1 fitted into large diameter cylinder 20
1 is equipped with a seal ring 31 for oil tightness with respect to the large diameter cylinder 20, while the small diameter cylinder 1
A throttle passage is formed between the inner circumferential surface of the piston 6 and the outer circumferential surface of the small diameter piston 36.

A cylindrical portion 37 is provided at the axis of the small-diameter piston 36 , and an inner end portion of the cylindrical portion 37 communicates with the large-diameter cylinder 20 through a radial passage 17 . In addition, the cylindrical part 3
valve seat 15 with an axial passage 18 at the open end of 7;
are screwed together. The spring 14 housed inside the cylindrical portion 37 presses the valve body 13 against the valve seat 15 to form a check valve that closes the axial passage 18.

Recess 33 provided at the tip of large diameter piston 11
Then, the ends of the push rod 9 are abutted. The open end of the large diameter cylinder 20, which is at atmospheric pressure, is closed by the dustproof boot 32 which is engaged between the end of the large diameter cylinder 20 and the push rod 9.

Next, the operation of the device of the present invention will be explained. When the clutch is in the engaged state, that is, when the clutch pedal is released, the large diameter piston 11 is returned to the position shown in FIG. 2 by the spring of the clutch mechanism.
The small diameter piston 36 is inserted into the small diameter cylinder 16.

Now, when the clutch pedal is depressed, pressure oil from the master cylinder 2 is sent to the inlet/outlet 19 through the conduit 3, and the large diameter piston 11 is pushed to the right in FIG. At the same time, the pressure oil in the inlet/outlet 19 pushes open the valve body 13 from the axial passage 18, enters the cylindrical part 37, and further enters the large diameter cylinder 20 via the radial passage 17, where it acts on the left end surface of the large diameter piston 11. . The push rod 9 is pushed to the right by the large diameter piston 11, and the clutch is disengaged.

When the clutch pedal is released, the rod 23 is returned to the right by the return spring 8, the hydraulic pressure applied from the master cylinder 2 to the inlet/outlet 19 is released, and the force pushing the large diameter piston 11 to the right is released. At this time, the valve body 13 is pushed back by the force of the spring 14, and the axial passage 18 is closed.

On the other hand, the shift fork 6 is pushed back by the force of the spring built into the clutch mechanism, and the large diameter piston 11 is pushed back to the left via the push rod 9. From the state shown in Fig. 3, the small diameter piston 3
6 enters the inside of the small-diameter cylinder 16, the flow of oil from the large-diameter cylinder 20 toward the inlet/outlet 19 is throttled.

The fluid resistance between the small diameter cylinder 16 and the small diameter piston 36 suppresses the rapid return movement of the large diameter piston 11, and as a result, the clutch plate is gently pressed against the flywheel by the pressure plate in the clutch mechanism. Then,
A smooth clutch connection is achieved.

"Effect of the invention" As mentioned above, the present invention has a stepped piston fitted into a stepped cylinder, a pressure oil inlet/outlet provided in the end wall of the small diameter cylinder, and an inner circumferential surface of the small diameter cylinder and an outer circumferential surface of the small diameter piston. A throttle passage is formed between the small-diameter piston and the large-diameter cylinder, and a check valve is provided in the passage that communicates the large-diameter cylinder with the inlet and outlet formed inside the small-diameter piston. Even if an inexperienced driver suddenly releases the clutch pedal, the clutch will engage abruptly, thereby preventing the engine from stalling or applying excessive shock, thus preventing damage to drivetrain components. Damage and shortened lifespan are prevented.

Sudden engagement of the clutch can be suppressed from the time the small-diameter piston is inserted into the small-diameter cylinder until it hits the end wall, and this stroke must be set to a size that suppresses the impact caused by sudden engagement of the clutch. This allows for quick and smooth clutch engagement.

In this invention, a mechanism is provided inside the stepped piston of the slave cylinder to suppress the return speed of the stepped piston (clutch engagement operation), so it can be easily implemented without making major changes to the conventional clutch operation mechanism, and it can be easily implemented in the vehicle. There are no restrictions on placement, and assembly is easy.

[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 in the clutch operating mechanism according to the present invention, and Fig. 3 is a side sectional view of the same device showing the clutch disengaged state. It is. 11: Large diameter piston, 13: Valve body of check valve, 1
4: Spring, 15: Valve seat, 16: Small diameter cylinder, 1
7: radial passage, 18: axial passage, 19: entrance/exit, 20: large diameter cylinder, 36: small diameter piston,
37: Cylindrical part.

Claims (1)

[Scope of utility model registration request] A stepped piston is fitted into a stepped cylinder, a pressure oil inlet/outlet is provided in the end wall of the small diameter cylinder, and a throttle passage is formed between the inner peripheral surface of the small diameter cylinder and the outer peripheral surface of the small diameter piston. A slave cylinder of a clutch, which is provided with a check valve that allows pressure oil to flow from the inlet/outlet to the large-diameter cylinder in a passage that communicates the inlet/outlet formed inside the large-diameter cylinder with the large-diameter cylinder.