JPS5989834A - Vibration isolating device for hydraulically operated clutch - Google Patents

Abstract

PURPOSE:To increase the response when a pedal is returned and simplify the construction by providing passages in a stepped piston, which are closed in a state of being brought in contact with the end surface of a liquid chamber on the actuating cylinder side by means of the pressing force of a spring. CONSTITUTION:In a cylinder 21 is housed a stepped piston 22, having a stepped construction with a small diametral shaft part 22a being extended in an integrated form in a liquid chamber B on the actuating-cylinder 3 side, while a vibration isolating spring 24 is installed in a liquid chamber A on the master- cylinder 2 side. The first passage 25 is provided in the center of the stepped piston 22 in the axial direction, and plural number of the second passages 26 are axially formed on the outer side in the large diameter part, and valve seats 27 are fitted in these passages 26. A narrow orifice 28 is provided for permanently connecting the liquid chambers A, B through the first passage 25. Very slight movement of the stepped piston 22 against the spring 24 on returning a clutch pedal 1, opens a flow route to the master cylinder 2, flowing liquid, thereby providing good response and simplifying the construction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration isolating device for a hydraulically operated clutch that connects and disconnects a clutch by transmitting vibration.

In order to solve the problem of liquid volume loss in conventional vibration isolators, the inventor has proposed a vibration isolator shown in Fig. 1 (
Concurrently filed patents 1).

In FIG. 1, 1 is a clutch pedal, 2 is a mask cylinder, 3 is an operating cylinder, 4 is an operating screw 1, 5 is a clutch, and a vibration isolator 6 is a hydraulic pressure path connecting the master cylinder 2 and the operating cylinder 3. It is located in the middle of.

The feature of this vibration isolator 6 is that a piston 8 provided in a cylinder 7 is interposed in series in the hydraulic pressure path, and by suppressing the screws 1 to 8 by the vibration isolating spring 9, the actuating cylinder 3
The pulsation of hydraulic pressure from the side is blocked to prevent it from being transmitted to the mask cylinder 2 side. On the other hand, when the clutch pedal 1 is depressed, the hydraulic pressure P1 on the liquid chamber A side changes to the hydraulic pressure P1 on the liquid chamber B side.
2, since Pl > P2, the valve piston 11
is pushed against the spring 12 to open the passage 15 of the screw I-line 8, which had been closed by the seal 13, and supply liquid to the working cylinder 3. Also, when clutch pedal 1 is released, 1
1 (P2), the piston E moves against the vibration isolation/spring 9, and when the end of the valve piston 11 hits the abutment part 14 of the liquid chamber A, the passage 15 of the screws 1 to 8 is moved. , and the liquid in the actuating cylinder 3 is transferred to the mask cylinder 2.

By the way, in the vibration isolator 6 shown in Fig. 1, even if the screws 1 to 8 move, the combined volume of the liquid chambers A and B is always constant, so no liquid loss occurs due to changes in volume. Since the structure was such that the liquid started flowing after the valve screw 11 hit the contact part 14 when returning the pedal, the response when the pedal was returned was poor, and the piston 8 and the valve piston 11 Since it has a one-tone structure, there is a problem that the structure is complicated.

The present invention has been made in view of the above, and an object of the present invention is to provide a vibration isolating device for a hydraulically actuated clutch that improves responsiveness when the pedal is returned and has a simple structure.

In order to achieve this object, the present invention provides a stepped piston with a small diameter shaft extending toward the working cylinder in the cylinder.
The first piston, which closes in the direction of the central axis of the stepped piston, is in contact with the end surface of the liquid chamber on the operating cylinder side due to the pressure of the spring.
At the same time, a second passage is formed in the axial direction of the large diameter portion of the stepped piston outside the first passage, and the differential pressure on both sides of the screws 1 to 1 facing the second passage is A valve seat is provided to open and close the passage, and the liquid chambers on both sides of the piston are always communicated through a narrow passage for releasing residual pressure.

Its action is that when the pedal is depressed, the mask cylinder hydraulic pressure pushes open the valve seat and supplies liquid to the actuating cylinder from the second passage, while when the pedal is returned,
The liquid is returned to the mask cylinder through the first passage by a slight movement of the piston against a spring due to differential pressure.

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 2 is a cross-sectional explanatory diagram showing an embodiment of the present invention together with a hydraulic operation system.

First, to explain the configuration, 1 is a clutch pedal, 2 is a mask cylinder, 3 is an operating cylinder, 4 is an operating piston,
5 is a clutch, and the vibration isolator 20 of the present invention is provided in the middle of a hydraulic path connecting the mask cylinder 2 and the actuating cylinder 3.

The vibration isolator 20 has stepped screws 1-22 slidably housed in a cylinder 21 formed in the body with a seal by an O-ring 23. It has a stepped structure in which a small forward shaft portion 22a is integrally extended in the chamber B. A vibration-proofing spring 24 is interposed in the liquid chamber Δ on the mask cylinder 2 side of the cylinder 21 partitioned by the stepped piston 22, and the small diameter shaft portion 22a of the stepped piston 22 is suppressed by the compression of the spring 2-4. It is brought into contact with the end face of the liquid chamber B.

Further, a first passage 25 is provided in the direction of the central axis of the stepped piston 22.
A stepped piston 2 in which a first passage 25 is formed and a first passage 25 is opened.
On the wall surface of the cylinder 21 that is in contact with the end surface of the small diameter shaft portion 2' 2a, an O-ring 29 of C, which serves as a seal for closing the first passage 25 in the abutting state, is attached at tJl. It will be worn.

Of course, the O-ring 29 may be fitted onto the stepped piston 22 side.

Further, a second passage 26 is formed in the axial direction of the large diameter portion outside the first passage 25 formed in the stepped piston 22, and the second passage 26 is formed in the circumferential direction of the stepped piston 22. It is formed in multiple locations.

A valve seat 27 made of an elastic material such as rubber is fitted into the stepped portion of the stepped piston 229 in which the second passage 26 is opened, and the hydraulic pressure P1 of the liquid chambers A and 8 is adjusted. The second according to the differential pressure of P2.
A valve mechanism is formed to open and close the passage 26.

Further, a liquid chamber B is provided in the small diameter shaft portion 22a of the stepped piston 22.
An orifice 28 is provided as a fall passage for constantly communicating the liquid chamber Δ with the first passage 25.
A radial notch may be provided at the shaft end of the small diameter shaft portion 22a.

Next, the operation of the vibration isolating device of the present invention shown in the embodiment shown in FIG. 2 will be explained.

When the hydraulic pressure P1 from the mask cylinder 2 increases due to depression of the clutch pedal 1, this hydraulic pressure P1 is applied to the vibration isolator 20.
Valve seal l-2 via liquid chamber A and second passage 2G.
7, and the hydraulic pressure P2 in the liquid chamber B on the working cylinder 3 side is 0.
Therefore, the valve seats 1 to 27 are expanded by the hydraulic pressure P1, and the hydraulic pressure P1 from the mask cylinder 2 is supplied to the actuating cylinder 3 via the second passage 26, and the actuating screws 1 to 4 are driven. Disengage clutch 5.

Next, when the clutch pedal 1 is released, the hydraulic pressure P1 in the mask cylinder 2 decreases, and P1-<P2, so the valve seat 27 closes the second passage 26 and the liquid chamber B
As the hydraulic pressure P2 increases, a force corresponding to the pressure difference between the hydraulic pressure P1 in the liquid chamber A and the stepped piston 22 is applied to the stepped screw 22, and this force exceeds the set load of the spring 24.
begins to move toward the liquid chamber A side. When the stepped piston 22 begins to move, the small diameter shaft portion 22a is released from contact with the O-ring 29, and the liquid returns to the mask cylinder 2 through the first passage 25. When the hydraulic pressure 'P2 of the actuation cylinder 3 approaches the hydraulic pressure P1 of the mask cylinder 2, the stepped piston 22 is pushed back to the illustrated position by the spring 24, and the stepped piston 22 is pushed back into the first passage 2.
5 is closed, and residual pressure remains on the liquid chamber B side, but this residual pressure passes through the orifice 28 and is transferred to the mask cylinder 2. No residual pressure remains on the liquid chamber B side of group 1.

On the other hand, when the clutch pedal 1 is depressed or in the middle of being depressed or released, mechanical vibration is applied to the operating piston ~ 4 from the clutch 5, and the hydraulic pressure of -4 in the operating cylinder 3 pulsates. In response to an increase in hydraulic pressure R2 due to pulsation,
When the valve seat 27 closes the second passage 26, the pulsating hydraulic pressure acts as a pressing force on the stepped piston 22, and the pulsating pressing force on the stepped piston 22 acts as a pressing force on the stepped piston 22.
Since the spring 24 is selected so that the spring 24 is within the load range of 1 to 4, the stepped piston 22 is
does not move, and fluid pressure fluctuations due to pulsations are blocked by the stage A piston 22 in the vibration isolator 2o, and are not transmitted to the mask cylinder 2 side.

FIG. 3 is a sectional view showing another embodiment of the present invention in which the vibration isolator 2° of the present invention shown in FIG. 2 is integrated with the mask cylinder 2.

First, the mask cylinder 2 has screws 1 to 31 slidably provided in the cylinder 30, and the screws 1 to 31 form a piston 31a with a built-in check valve mechanism on the forward side, and the input rod 32. Piston part 3 on the contact side
1b, and includes a cavity 31c hollowed out in the axial direction between the piston parts 31a and 31b, and the piston part 3
A stopper bolt 34 is inserted into the cavity 310 and comes into contact with the valve rod 33 of the check valve incorporated in 1a.

The check valve built into the piston part 31a communicates the liquid chamber C with the reservoir tank 35 via the cavity part 31c with the illustrated valve rod 33 in contact with the stopper bolt 34, and when the clutch pedal is depressed. When the piston 31 moves forward under the pressure of the input bolt 32 and the valve rod 33 separates from the stopper bolt 34, the check valve closes and the liquid in the liquid chamber C is pressurized by the piston bolt 31a.

In the mask cylinder 2 having such a structure, the vibration isolator 2o of the present invention is incorporated at the tip of the liquid chamber C, and the springs 20 of the vibration isolator are connected to the retaining ring 37 that abuts the return spring 36 of the mask cylinder. One end of the spring 24 is received, and a stepped piston 22 is provided following the spring 24, and the stepped piston 22 has a first passage 25 and a second passage 26, and a first passage 25 and a second passage 26. Two O-rings are attached to the opening of the passage 25, and valve seats 1 to 27 are attached to the stepped portion of the stepped piston 22, which becomes the opening of the second passage 26.

As shown in the embodiment of FIG. 3, the vibration isolator 1ff of the present invention
In the lf 20, the stepped screw 1-22 is installed in series with the hydraulic pressure supply path, so there is no G in the mask cylinder 2.
It is possible to adopt a configuration in which the clutch is integrated in the sliding axis direction of the piston 31, thereby reducing the number of parts in the hydraulically operated clutch and facilitating piping connection.

The embodiment shown in FIG. 3 is for a mass cylinder.

Although the integral structure of the vibration isolator 20 of the present invention has been taken as an example, the vibration isolator 20 of the present invention may be integrated into the actuating cylinder 3 side as another embodiment.

As is clear from the above explanation, the anti-vibration bag ff1 of the present invention
20 and J3, the very slight movement of the stepped piston against the spring when the clutch pedal is released opens the flow path to the mask cylinder and allows fluid to flow, resulting in poor responsiveness when the pedal is returned. Moreover, since the structure uses only a single stepped screw, the structure can be simplified compared to the conventional composite piston II structure.

On the other hand, an effect unique to the present invention is that when the anti-vibration device of the present invention is integrated with a mask cylinder, the liquid chamber on the mask cylinder side in the anti-vibration @ position is shared with the liquid chamber of the mask cylinder. Therefore, the cylinder processing when incorporating the vibration isolator into the mask cylinder becomes extremely easy, and a structure in which the vibration isolator is integrated can be realized without increasing the size of the mask cylinder.

[Brief explanation of drawings]

Fig. 1 is a system explanatory diagram of a hydraulically operated clutch using a vibration isolating device proposed by the inventors of the present invention, Fig. 2 is a cross-sectional explanatory diagram showing an embodiment of the present invention together with a hydraulic system; FIG. 3 is a sectional view showing another embodiment of the present invention integrated with a mass da cylinder. 1: Clutch pedal 2: Mask cylinder 3: Operating cylinder 4: Operating screw 1-5: Clutch
20: Vibration isolator 21 cylinder 22: Stepped piston 22a: Small diameter shaft portion 23. 29: O-ring 2
4 Spring 25: First passage 26 2 Second passage 27: Valve seat 28 Niorifice 3
1C: Cavity 32: Input Rondo 33: Valve Rod 34 Varnish 1-Tubapol 1-35
: Reservoir tank 36: Return spring 37: Retaining ring patent applicant Rhythm Automotive Parts Manufacturing Co., Ltd. Agent Patent attorney Inclination Procedural amendment (spontaneous) February 4, 1981 Commissioner of the Patent Office Kazuo Wakasugi 1, Indication of the case 1981 Patent Application No. 200000 @ 2, Name of the invention: Hydraulic operated clutch vibration isolator 3, Relationship with the case of the person making the amendment Patent applicant address: 3 names, 2831 Miyukicho, Hamamatsu City, Shizuoka Prefecture Rhythm Automotive Parts Manufacturer Co., Ltd. 4, Agent No. 105 Address: 4th floor, Nishi-Shinbashi Chuo Pill, 3-157a8 Nishi-Shimbashi, Minato-ku, Tokyo The phrase “both sides of the piston” on page 5, line 9 has been corrected to “both sides of the piston at the piston step”. (2) The phrase “through” on page 5, line 17 of the specification has been changed to “through”. (3) The phrase "becomes 1 or more" on page 9, line 8 of the Akira IlIl Book is amended to "becomes more than". (4) "Piston" on page 11, line 1 of the specification There is a certain
Correct it to "piston part". (5) The words "piston missing 31a" on page 11, lines 3 to 4 and line 15 of page 11 of the specification are respectively corrected to "piston part 31a." (6) Line 2 of page 12 of the specification [The text 20J in the vibration isolator is corrected to read ``20J of vibration isolator.'' (7) Add the following sentence following line 16 of page 14 of the specification. Add. "31: Piston 31a, 31b: Piston portion" 8) Correct Figure 3 as shown in the attached correction drawing.

Claims (1)

[Scope of Claims] A mask cylinder is provided in the middle of a hydraulic pressure path from a mask cylinder that generates hydraulic pressure in response to depression of a clutch pedal to an operating cylinder of a clutch mechanism, and the mask is provided to prevent pulsations of hydraulic pressure generated in the operating cylinder. In a vibration isolator for a hydraulic clutch that damps hydraulic pressure so that it is not transmitted to the cylinder, it is slidably installed in a cylinder formed in the body.
a stepped piston with a small diameter shaft portion extending into the working cylinder side liquid chamber; and a spring interposed in the mask cylinder side liquid chamber of the cylinder to press the small diameter shaft portion of the stepped piston against the end surface of the working cylinder side liquid chamber. a first passage formed in the central axis direction of the stepped piston and communicating the liquid chambers on both sides of the piston; a seal member that closes the first passage; and a second seal member that is formed in the axial crystal of the large diameter portion of the stepped piston that is outside the first passage and that communicates the liquid chambers on both sides of the piston.
and the second passage are attached to the stepped portion of the stepped piston having the same opening, and when the mask cylinder hydraulic pressure is higher than the operating cylinder hydraulic pressure, the second passage is opened and the mask cylinder hydraulic pressure is increased. is lower than the operating cylinder hydraulic pressure, a valve seat that closes the second passage, and a narrow passage having a smaller passage area than the first and second passages that constantly communicate the liquid chambers on both sides of the piston. Hydraulic operation characterized by ? Latch vibration isolator.