JPH0446223A - Automotive clutch damper - Google Patents

Abstract

PURPOSE:To suppress the operation stroke of a pedal by installing a stepped cylinder, penetrating through the pipe wall of a pipe for feeding the working oil and accommodating a stepped piston and a damper rubber which is previously compressed state in contact with the spread diameter part of the stepped piston. CONSTITUTION:A stepped cylinder 27 is installed, penetrating through the pipe wall of a conduit 9 for feeding the working oil into a clutch, and a stepped piston 51 is inserted. A large diameter part 27b is formed on the cylinder 27, having a stepped part 27a as boundary, and a spread diameter part 51a is formed on the piston 51. A damper rubber 35 is arranged in contact with the spread diameter part 51a in the large diameter part 27b, and set in compressed state previously between the spread diameter part 51a and a cover member 39. Accordingly, the piston 51 does not slidingly move unless the hydraulic pressure in a liquid passage 9a increases over a certain value, and the increase of the operation stroke of a pedal arm is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an automobile clutch damper inserted between a clutch master cylinder and a clutch.

2. Description of the Related Art Generally, as shown in FIG. 2, for example, in an automobile clutch, the other end of a rod 5, which is pivotally connected to the vicinity of the upper end of a pedal arm 3 to which a clutch pedal 1 is fixed, is inserted into a master cylinder 7. A pipe body 9 that is fitted and led out from this master cylinder 7 is connected to an operating cylinder 11, and the other end of a with-roal lever 13 driven by the operating cylinder 11 is connected to a clutch sleeve 15 to act as a clutch. 20 is driven. In the figure, 17 is a flywheel constituting the clutch 20, 19 is a clutch disk, 21 is a clutch cabinet, and 123 is a clutch release.

Furthermore, a clutch damper 25 is disposed in the middle of the tube body 9. The clutch damper 25 has the function of preventing vibrations of the clutch pedal 1 caused by pulsation of the hydraulic fluid accompanying engine vibrations, and of reducing transmission of noise from the engine compartment to the passenger compartment. (Regarding the arrangement of the clutch damper 25 mentioned above, please refer to the Nissan Technical Report No. 2 published by Nissan Motor Co., Ltd. on July 25, 1989.
(See page 59 of No. 5) FIG. 3 is a sectional view showing an example of the clutch damper 25, in which a stepped cylinder 27 is provided passing through one end of the tube wall constituting the tube body 9. and this cylinder 27
A piston 29 is slidably inserted into the interior. The piston 29 has a stopper 2 at a portion facing the liquid path 9a.
9a is integrally protruded, and the stopper 29a
A seal member 31 is arranged between the cylinder 17 and the cylinder 27. Further, a return spring 33 is inserted between a recess 9b formed in the inner wall surface of the tube body 9 and the seal member 3.

The cylinder 27 has a large diameter part 27b with the step part 27a as a boundary, and a damper rubber 35 and a disc-shaped plate 37 to which the damper rubber 35 is fixed are arranged in the large diameter part 27b. has been done. A cover member 39 is provided to prevent the damper rubber 35 from being removed, and the cover member 39 is fixed to the end wall of the large diameter portion 27b of the cylinder 27 with bolts 41 and 41.

Disc-shaped plate 37 to which damper rubber 35 is fixed
has a size that allows sliding contact with the inner surface of the large diameter portion 27b of the cylinder 27, and the presence of this plate 37 forms a small gap α between the damper rubber 35 and the large diameter portion 27a of the cylinder 270. has been done.

According to this clutch damper 25, the piston 29 is constantly pressed against the plate 37 by a moderate elastic force urged by the return spring 33, and the piston 29 is pressed against the plate 37 at all times.
9 and the plate 37 are kept in close contact with each other.

Under such conditions, when pulsation occurs in the hydraulic fluid passing through the liquid path 9a, the piston 29 slides to the right in the figure due to the pulsation, and the damper rubber 35 fixed to the plate 37 moves into the gap α. Since the damper rubber 35 is compressively deformed within this range, the pulsation component can be absorbed by this compressive deformation of the damper rubber 35.

Furthermore, when the liquid path 9a side becomes negative pressure, the piston 29 moves to the left in the figure against the biasing force of the return spring 33, but the stopper 29a protruding from the piston 29 moves to the left of the pipe body. 9 and prevents the piston 29 from moving excessively.

Problems to be Solved by the Invention However, in the case of such a structure of the conventional clutch damper 25, the piston 29 can freely move inside the cylinder 2'1' in response to the pulsation of the hydraulic fluid passing through the fluid path 9a. Since the piston 29 is configured to slide, the sliding range of the piston 29 becomes large, and as the piston 29 moves, the operating stroke of the pedal arm 3 to obtain the necessary pressure becomes large, causing the driver to There was a problem that the burden on the staff would increase.

Furthermore, when fixing the damper rubber 35 to the plate 37, a technique for centering the damper rubber 35 is required, so there is a problem in that a complicated fixing process is required. Since the disc-shaped plate 37 was formed with a size that allowed it to come into sliding contact with the inner surface of the large-diameter portion 27b of the cylinder 27, the peripheral end of the plate 37 was large when the damper rubber 35 was compressed and deformed. When the damper rubber 35 slides on the inner wall surface of the diameter portion 27b, elastic deformation of the damper rubber 35 tends to be insufficient due to this sliding resistance.

Furthermore, a stopper 29a integrally protrudes from the piston 29.
protrudes into the liquid path 9a, and since the return spring 33 is disposed within the liquid path 9a, the stopper 29g and the return spring 33 may become an obstacle to the flow of the hydraulic fluid. Another problem is that there is a tendency to become used to it, which has an adverse effect on the operation of the clutch.

Therefore, the present invention solves the problems that conventional automobile clutch dampers have, by reducing the operating stroke of the pedal arm to obtain the necessary hydraulic pressure, and by reducing the sliding movement during compressive deformation of the damper rubber. It is an object of the present invention to provide a clutch damper that has low resistance and does not pose an obstacle to the flow of hydraulic fluid.

Means for Solving the Problems In order to achieve the above object, the present invention supplies hydraulic fluid obtained from the master cylinder with the actuation of the clutch pedal to the clutch through the pipe body, and also supplies the hydraulic fluid obtained from the master cylinder with the operation of the clutch pedal to the clutch in the middle of the pipe body. In a configuration in which a clutch damper is disposed in the part for preventing vibrations of the clutch pedal due to pulsation of the hydraulic fluid, first of all, according to claim 1, the clutch damper is provided so as to penetrate through one end of a pipe wall constituting the pipe body. , a stepped cylinder in which a large-diameter portion is formed with a stepped portion formed approximately in the middle as a boundary, and an enlarged diameter portion that is inserted into the stepped cylinder and corresponds to the shape of the stepped portion of the cylinder. a stepped piston having a stepped piston; a damper rubber inserted in a moderately compressed state in advance within the large diameter portion of the cylinder and in a portion that contacts the enlarged diameter portion of the piston; and a damper rubber fixed to the open end of the cylinder. According to a second aspect of the present invention, the damper rubber is fixed in advance to an inner center position of the lid member.

Furthermore, according to a third aspect of the present invention, there is provided a clutch damper for an automobile in which a minute gap is also formed between the enlarged diameter portion of the piston and the large diameter portion of the cylinder.

Effects According to the structure of the clutch damper, the damper rubber is inserted between the enlarged diameter portion of the piston and the lid member in an appropriately compressed state, so that the screws F and The enlarged diameter portion of the cylinder is pressed against the stepped portion of the cylinder with appropriate elasticity. If pulsation occurs in the hydraulic fluid flowing in the fluid path under such conditions,
When this pulsation reaches a certain level, the piston can absorb the pulsation component while further compressing and deforming the damper rubber.

Therefore, the piston will not slide inside the cylinder unless the fluid pressure in the fluid path increases above a certain level, which prevents the pedal arm's operating stroke from increasing in order to obtain the necessary fluid pressure. The burden on

In addition, since excessive movement of the piston is prevented, the piston does not partially jump out into the crossroads, and the flow of hydraulic fluid is improved.
- is prevented from becoming a hindrance.

Furthermore, by fixing the damper rubber in advance to the center position inside the lid member, the insertion work and centering of the damper rubber during assembly are facilitated. An embodiment of the automobile clutch damper according to the invention will be described in detail with the same reference numerals attached to the same components as those of the conventional structure.

In the configuration of the clutch damper 50 shown in FIG.
is a tubular body, and a stepped cylinder 27 is provided passing through one end of a tube wall constituting the tubular body 9, and a stepped piston 51 is inserted into the inside of this cylinder 27. That is, the cylinder 27 is formed with a large diameter part 27b with the stepped part 27a as a boundary, and the piston 51 has an enlarged diameter part 5 corresponding to the shape of the stepped part 27a of the cylinder 270.
1a is formed.

Within the large diameter portion 27b of the cylinder 27 and within the piston 5
A damper rubber 35 is attached to the part that contacts the enlarged diameter part 51a of 1.
is located. Reference numeral 39 denotes a lid member fixed to the open end of the cylinder 27 to prevent the damper rubber 35 from being removed. Fixed.

The damper rubber 35 is placed in an appropriately compressed state in advance and inserted between the enlarged diameter portion 51a of the bisto saw 51 and the lid member 39. Incidentally, the damper rubber 35 may be fixed in advance to the inner center position of the lid member 35.

An appropriate gap α is formed between the damper rubber 35 and the large diameter portion 27a of the cylinder 27, and a small gap is also formed between the enlarged diameter portion 51a of the piston 51 and the large diameter portion 27b of the cylinder 27. A gap α' is formed.

Further, a short and small stopper 29a is provided integrally with the piston 51 at a portion of the piston 51 facing the liquid path 9a, and a seal is provided between the flange portion 29b of the stopper 29a and the cylinder 27 and the piston 51. A member 31 is arranged.

According to the structure of the latch damper 50, the damper rubber 35 is inserted between the enlarged diameter portion 51a of the piston 51 and the lid member 39 in a moderately compressed state in advance. Due to the elastic force, the enlarged diameter portion 51a of the piston 51 connects to the stepped portion 27 of the cylinder 27.
A is pressed with appropriate elasticity.

Under these conditions, if pulsations occur in the hydraulic fluid flowing in the directions of arrows A and B in the liquid path 9a due to engine vibrations (not shown) or other causes, the pulsations may reach a certain level. When the piston 51 reaches the damper rubber 35
The pulsating component can be absorbed by sliding to the right in the figure while further compressing and deforming within the gap α.

Therefore, the piston 51 does not slide inside the cylinder 27 unless the hydraulic pressure in the liquid path 9a becomes greater than a certain level, so the operating stroke of the pedal arm 3 is necessary to obtain the necessary hydraulic pressure from a master cylinder (not shown). This prevents the driver from increasing, reducing the burden on the driver.

On the other hand, when the liquid path 9a side becomes negative pressure, the piston 51 tries to move to the left in the figure, contrary to the above, but at this time, the enlarged diameter portion 51a of the piston 51 moves to the stepped portion 27a of the cylinder 27.
By coming into contact with this, the stepped portion 27a acts as a stopper, preventing the piston 51 from sliding further to the left from the illustrated position, thereby preventing excessive movement of the piston 51.

Therefore, the stopper 29 integrally protrudes from the piston 51.
This prevents the stopper 29a from becoming an obstacle to the flow of the hydraulic fluid.

Further, by fixing the damper rubber 35 in advance to the inner center position of the lid member 35, there is an advantage that insertion and centering of the damper rubber 35 are facilitated during assembly.

During the above operation, due to the minute gap α' formed between the enlarged diameter portion 51a of the piston 51 and the large diameter portion 27b of the cylinder 27, the enlarged diameter portion 51a is closed when the piston 51 slides.
does not slide on the inner wall surface of the large diameter portion 27b, and therefore the damper rubber 35 does not undergo insufficient elastic deformation due to sliding resistance.

In the case of this embodiment, the damper rubber 35 is in a moderately compressed state in advance, and the expanded diameter portion 5 of the piston 51 is
Since the damper rubber 35 is inserted between the damper rubber 35 and the lid member 39, it is assumed that the pulsation absorbing effect cannot be obtained unless the hydraulic pressure of the hydraulic fluid flowing in the liquid path 9a becomes high. The compression ratio can be changed as appropriate, and this can be handled by adjusting the compression ratio according to the amount of depression of the clutch pedal (not shown).

Effects of the Invention As described above in detail, the following effects are brought about by applying the clutch damper according to the present invention.

That is, since the damper rubber is inserted between the enlarged diameter part of the piston and the lid member in an appropriately compressed state, the elastic force of the damper rubber causes the enlarged diameter part of the piston to press against the stepped part of the cylinder. Since the piston is pressed with appropriate elasticity and excessive movement of the piston is prevented, the piston will not partially protrude into the fluid path and will not become an obstacle to the flow of the hydraulic fluid. When pulsation occurs in the hydraulic fluid flowing in the liquid path under such conditions, and when this pulsation reaches a certain level, the piston absorbs the pulsation component while further compressing and deforming the damper rubber. be able to.

Therefore, the piston will not slide inside the cylinder unless the fluid pressure in the fluid path increases above a certain level, which prevents the pedal arm's operating stroke from increasing in order to obtain the necessary fluid pressure. can reduce the burden on

Further, according to the structure of claim 2, by fixing the damper rubber in advance at the center position inside the lid member, it is possible to obtain the effect that insertion work and centering of the damper rubber are facilitated during assembly. .

Furthermore, according to the structure of claim 3, by forming a minute gap between the enlarged diameter part of the piston and the large diameter part of the cylinder, the enlarged diameter part is moved inside the large diameter part of the cylinder when the piston slides. It is possible to prevent a situation in which the damper rubber does not slide on the wall surface and the elastic deformation of the damper rubber is insufficient due to sliding resistance.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of essential parts showing an embodiment of an automobile clutch damper according to the present invention, FIG. 2 is a schematic diagram showing an operating system of an automobile clutch, and FIG. 3 is a diagram of a conventional clutch damper.
FIG. 3 is a sectional view of a main part showing an example. ...Clutch pedal, 3...Pedal arm,...Master cylinder, 9...Pipe body, 9a...Liquid path, 0...
・Clutch, 27... cylinder, 27a... step part,
7b... Large diameter part, 31... Seal member, 5... Tambour rubber, 39... Lid member, 0... Clutch damper, 51... Piston, 1a... Expanded diameter part. Outside J Figure 2a 7a 7b 9a 1a Pipe branch/renoder (useful) Step part large diameter part stopper knoll member damper rubber i member clutch damper viscosity enlarged diameter part Fig. 3

Claims (3)

[Claims] (1) Hydraulic fluid obtained from the master cylinder as the clutch pedal operates is supplied to the clutch via the tube, and a part in the middle of the tube prevents clutch pedal vibration caused by pulsation of the hydraulic fluid. In a configuration in which a clutch damper is provided for the purpose of a stepped piston inserted into the stepped cylinder and having an enlarged diameter portion corresponding to the shape of the stepped portion of the cylinder; 1. A clutch damper for an automobile, comprising: a damper rubber inserted in a moderately compressed state in advance into a portion that contacts the cylinder; and a lid member fixed to an open end of the cylinder. (2) The automobile clutch damper according to claim 1, wherein the damper rubber is fixed in advance to a central position inside the lid member. (3) The automobile clutch damper according to claim 1, further comprising a minute gap formed between the enlarged diameter portion of the piston and the large diameter portion of the cylinder.