JP5045444B2 - Clutch release bearing device - Google Patents

Description

The present invention relates to a clutch release bearing device disposed between a release fork and a diaphragm spring.
About.

Conventionally, in a clutch release bearing device, for example, a core bar for connecting a sleeve made of synthetic resin slidably fitted on an outer peripheral surface of a cylindrical retainer to a release fork is embedded in the thickness of the sleeve. There is a known structure having a core tube portion and a flange portion projecting radially outward from one end portion of the core tube portion and connected to a release fork. Yes. Further, a clutch release bearing is assembled to the sleeve by a cover member.
In the clutch release bearing device having such a structure, in order to reduce the inclination of the central axis of the sleeve with respect to the retainer, an extended cylindrical portion at one end of the sleeve (the end opposite to the direction in which the core cylindrical portion of the core bar extends) And the sleeve is made longer by this length (see, for example, Patent Document 1).
JP-A-7-54865

By the way, when the extension cylinder part is formed on one end side of the sleeve, the extension cylinder part is thick in order to give the required rigidity. As a result, contraction (sinking) toward the inner diameter side after the sleeve is molded from the synthetic resin material is likely to occur in the extended cylindrical portion of the sleeve.
For this reason, the sleeve must be formed of a synthetic resin material in consideration of the amount of contraction of the sleeve extension tube portion toward the inner diameter side.
For this reason, the inner diameter dimension and roundness of the sleeve including the extension cylinder portion are likely to vary, and a gap larger than the set value is set in the fitting portion between the outer peripheral surface of the retainer and the inner peripheral surface (inner diameter surface) of the sleeve. Is likely to occur.
Then, the central axis of the sleeve is inclined with respect to the retainer due to the gap between the fitting portion between the outer peripheral surface of the retainer and the inner peripheral surface of the sleeve, and this may cause abnormal noise (clutch judder noise).

  In view of the above problems, an object of the present invention is to provide a clutch release bearing capable of increasing the accuracy of the inner diameter dimension and roundness of a sleeve including the extension cylinder part by suppressing the contraction of the extension cylinder part toward the inner diameter side of the sleeve. Is to provide a device.

In order to solve the above problems, a clutch release bearing device according to claim 1 of the present invention is a clutch release bearing device disposed between a release fork and a diaphragm spring,
A synthetic resin sleeve that is slidably fitted on the outer peripheral surface of the cylindrical retainer, a cover member that moves integrally with the sleeve, and an inner diameter of the diaphragm spring that is assembled to the cover member A clutch release bearing that contacts and presses the side part,
A core bar for connecting the sleeve to the release fork is attached to the sleeve,
The cored bar integrally includes a core tube part and a flange part projecting radially outward from one end of the core tube part and connected to the release fork,
The sleeve includes a body cylinder portion in which a core tube portion of the core metal is embedded in a wall thickness and extends along an inner peripheral surface of an inner ring of the clutch release bearing, and a direction opposite to the extending direction of the body tube portion And an extension tube part extending to
A shrinkage prevention portion is provided between the flange portion of the cored bar and the extended cylindrical portion of the sleeve to suppress the shrinkage toward the inner diameter side after the sleeve is formed of a synthetic resin material. To do.

According to the above configuration, the shrinkage prevention portion between the flange portion of the core metal and the extension cylinder portion of the sleeve suppresses shrinkage (sink) to the inner diameter side of the extension cylinder portion after the sleeve is formed of the synthetic resin material. be able to. For this reason, the accuracy of the inner diameter dimension and roundness of the sleeve including the extension tube portion can be increased.
As a result, the inner diameter surface of the sleeve including the extension cylinder portion can be slidably fitted to the outer peripheral surface of the retainer so that the sleeve and the center axis of the clutch release bearing are inclined with respect to the retainer. It can suppress and generation | occurrence | production of abnormal noise (clutch judder sound) can be prevented.

A clutch release bearing device according to claim 2 is the clutch release bearing device according to claim 1,
The shrinkage prevention part is composed of a concave groove-like locking part that is recessed on one side of the flange part, and an engagement part that is filled and molded into the concave groove-like locking part from the extended cylindrical part of the sleeve. It is characterized by being.

  According to the said structure, a shrinkage | contraction prevention part can be comprised by the simple structure which concavely arranges a groove-shaped latching | locking part in the one side of a flange part, and an effect is large in cost reduction.

  The best mode for carrying out the present invention will be described in accordance with an embodiment.

[Example 1]
A first embodiment of the present invention will be described with reference to FIGS.
1 is a longitudinal sectional view showing a clutch release bearing device according to Embodiment 1 of the present invention. FIG. 2 is an enlarged longitudinal sectional view showing the relationship between the sleeve and the cored bar. FIG. 3 is an enlarged cross-sectional view showing a shrinkage preventing portion between the flange portion of the core metal and the extended cylindrical portion of the sleeve.

  As shown in FIG. 1, the clutch release bearing device that is located between the engine and the transmission of the vehicle and is incorporated between the release fork 7 and the diaphragm spring 30 is integrally extended from the case side of the transmission. A synthetic resin sleeve 40 that is slidably fitted on the outer peripheral surface of the cylindrical retainer 3, a cover member 10 that moves integrally with the sleeve 40, and a cover member 10 that is assembled to the cover member 10, A clutch release bearing 20 that presses in contact with the inner diameter side portion 31 of the diaphragm spring 30 is provided.

  As shown in FIG. 2, the cover member 10 is formed in an annular portion 11 provided along one side surface of a flange portion 51 of a metal core 50 to be described later, and is formed in a bent shape at an inner diameter end of the annular portion 11. The annular bent portion 12 embedded in the main body cylindrical portion 41 of the sleeve 40 to be described in detail by insert molding, the cylindrical portion 13 formed in a bent shape along the axial direction from the outer diameter end of the annular portion 11, It has integrally the annular support part 14 formed in the bent shape toward the center side from the front-end | tip of the cylindrical part 13. As shown in FIG. The cover member 10 is moved in the axial direction integrally with the sleeve 40.

The clutch release bearing 20 is arranged to be able to roll while being held by a retainer 23 between an outer ring 21, an inner ring 25 concentrically disposed on the inner periphery of the outer ring 21, and the outer ring 21 and the inner ring 25. A plurality of balls 22 are provided.
The outer ring 21 is disposed in a loosely fitted state with a predetermined gap on the inner peripheral surface of the cylindrical portion 13 of the cover member 10.
Further, in a state where one end surface of the outer ring 21 is in contact with the annular portion 11 of the cover member 10, a wave spring 8 for alignment is provided between the other end surface of the outer ring 21 and the annular support portion 14 of the cover member 10. It is intervened. When a radial eccentricity occurs between the diaphragm spring 30 and the clutch release bearing 20, the clutch release bearing 20 is moved relative to the diaphragm spring 30 via the wave spring 8 in the radial direction. The clutch release bearing 20 is aligned with the diaphragm spring 30.
In addition, an annular pressing portion 28 that extends in contact with the circumferential direction of the inner diameter side portion 31 of the diaphragm spring 30 is integrally extended to the inner ring 25 of the clutch release bearing 20 at one end facing the diaphragm spring 30. .

As shown in FIG. 2, the sleeve 40 is connected to the release fork 7 via a cored bar 50.
The cored bar 50 is formed by pressing a metal plate (steel plate or the like), protrudes radially outward from one end of the cylindrical cored cylinder part 52, and the release fork 7. And a flange portion 51 connected to each other via a clip 6. When the release fork 7 is actuated by depressing a clutch pedal (not shown), the sleeve 40 is slid along the retainer 3 to the left in the axial direction along the retainer 3. As a result, the cover member 10 and the clutch release bearing 20 are also moved to the left in the axial direction, the annular pressing portion 28 of the clutch release bearing 20 presses the inner diameter side portion 31 of the diaphragm spring 30 and the clutch (not shown) is actuated (disconnected). ) A power transmission shaft 2 for transmitting torque between the engine and the transmission is inserted into the retainer 3 (see FIG. 1).

The sleeve 40 is formed into a cylindrical shape by injection molding of a synthetic resin material, and at the same time as the sleeve 40 is molded, the core tube portion 52 of the core metal 50 is embedded in the wall thickness, and the inner ring 25 of the clutch release bearing 20 is embedded. A main body cylinder portion 41 extending along the inner peripheral surface and an extension cylinder portion 42 extending in a direction opposite to the extending direction of the main body cylinder portion 41 are integrally provided.
In addition, an annular protrusion 45 is integrally formed on the outer peripheral surface of the extension cylinder portion 42 so as to contact the flange portion 51 of the core metal 50 and protrude outward in the radial direction.
Further, an annular recess 46 is formed at a central portion in the axial direction of the inner peripheral surface of the sleeve 40 with a predetermined groove depth (slight groove depth), and on the outer peripheral surface of the retainer 3 on both sides of the annular recess 46. An inner diameter surface 47 to be slidably inserted is formed.
That is, in the first embodiment, when the sleeve 40 is injection-molded with the synthetic resin material, the core metal 50 is set in the mold, and then the cavity in the mold is filled with the synthetic resin material. The sleeve 40 configured as described above is integrally formed.

As shown in FIG. 2, between the flange portion 51 of the core metal 50 and the extended cylinder portion 42 including the annular protrusion 45 of the sleeve 40, the sleeve 40 is moved to the inner diameter side after injection molding with a synthetic resin material. The shrinkage prevention part 60 which suppresses shrinkage | contraction (sink) of this is provided.
In the first embodiment, as shown in FIG. 3, the shrinkage-preventing portion 60 includes a groove-like locking portion 61 that is recessed on one side surface of the flange portion 51 of the core metal 50, and an extension of the sleeve 40. It is comprised from the annular protrusion 45 of the cylinder part 42, and the engaging part 65 filled and molded in the groove-shaped latching | locking part 61. As shown in FIG.
Further, when the concave groove-shaped locking portion 61 is formed in the flange portion 51 of the cored bar 50, the cross-sectional V-groove shape, U-groove shape or the like having an annular locking surface 62 orthogonal to the radial direction on the inner diameter side. It is desirable to be formed.

In the clutch release bearing device according to the first embodiment configured as described above, a concave groove-like locking portion 61 formed in the flange portion 51 of the cored bar 50 and an annular protrusion of the extended cylindrical portion 42 of the sleeve 40. Shrinkage of the sleeve 40 from the synthetic resin material to the inner diameter side after the sleeve 40 is molded by the shrinkage-preventing portion 60 with the engaging portion 65 formed by filling the concave groove-like locking portion 61 from 45 (Sink) can be suppressed satisfactorily.
For this reason, the accuracy of the inner diameter dimension and roundness of the inner diameter surface 47 of the inner periphery of the sleeve 40 including the main body cylinder portion 41 and the extension cylinder portion 42 can be increased.
As a result, the inner diameter surface 47 of the sleeve 40 can be slidably fitted to the outer peripheral surface of the retainer 3 with high accuracy. As a result, the inclination of the central axis of the sleeve 40 and the clutch release bearing 20 with respect to the retainer 3 can be satisfactorily suppressed.
As a result, the annular pressing portion 28 provided on the inner ring 25 side of the clutch release bearing 20 can be pressed in a state in which it is uniformly in contact with the circumferential direction of the inner diameter side portion 31 of the diaphragm spring 30. Sound) can be prevented.

Further, in the first embodiment, before setting the cored bar 50 in the mold corresponding to the sleeve 40, a concave groove-like locking part 61 is provided in advance on one side surface of the flange part 51 of the cored bar 50. As a result, the sleeve 40 is injection-molded with the synthetic resin material, and at the same time, a portion of the synthetic resin material is filled in the recessed groove-shaped engaging portion 61 of the flange portion 51, thereby The engaging portion 65 is formed so as to protrude from one side of the annular protrusion 45.
As described above, the shrinkage preventing portion 60 can be configured by a very simple structure in which the concave groove-like locking portion 61 is provided in one side surface of the flange portion 51 of the cored bar 50, which is highly effective in reducing the cost.

  As shown in FIG. 3, when an annular locking surface 62 orthogonal to the radial direction is formed on the inner diameter side of the concave groove-shaped locking portion 61, the extended cylinder is formed by the annular locking surface 62. Shrinkage (sink) toward the inner diameter side of the portion 42 can be further suppressed, and the accuracy of the inner diameter dimension and roundness of the inner diameter surface 47 of the inner periphery of the sleeve 40 can be further increased.

[Example 2]
Next, a second embodiment of the present invention will be described with reference to FIG.
4 is a longitudinal sectional view showing a clutch release bearing device according to Embodiment 2 of the present invention.
As shown in FIG. 4, in the second embodiment, a pressing portion 128 that presses the inner diameter side portion 31 of the diaphragm spring 30 is formed separately from the inner ring 125 of the clutch release bearing 20 and is formed at the tip of the inner ring 125. , And an aligning elastic body (a disc spring, a wave spring, a leaf spring, a rubber elastic body, etc.) 129 so as to be tiltable.
Since the other configuration of the second embodiment is configured in the same manner as the first embodiment, the same components are denoted by the same reference numerals and the description thereof is omitted.

Therefore, this second embodiment also has the same operational effects as the first embodiment.
In particular, in the second embodiment, when the radial eccentricity occurs between the diaphragm spring 30 and the clutch release bearing 20, the wave spring 8 is used as the first aligning spring and the elastic body 129 is used as the second aligning spring. As a result, it is possible to perform double alignment, which is very effective in preventing abnormal noise (clutch judder noise).

In addition, this invention is not limited to the said Example 1 and 2, In the range which does not deviate from the summary of this invention, it can also be implemented with a various form.
For example, in the first and second embodiments, the concave groove-shaped locking portion 61 formed in the flange portion 51 of the core metal 50, and the extended cylindrical portion 42 of the sleeve 40 filled in the concave groove-shaped locking portion 61. Although the case where the shrinkage prevention part 60 is formed by the engaging part 65 formed integrally with the annular protrusion 45 is illustrated, as shown in FIG. 5, a convex ring is formed on one side of the flange part 51 of the core metal 50. And a convex ring-shaped locking part 161 is inserted into the annular protruding part 45 of the extension cylinder part 42 to form a concave groove-shaped engaging part 165 simultaneously with the formation of the sleeve 40. Even if the anti-shrinkage part 160 is configured, the present invention can be implemented.
However, in this case, it is desirable to form an annular locking surface 162 orthogonal to the radial direction on the outer diameter side of the convex ring-shaped locking portion 161.

It is a longitudinal cross-sectional view which shows the clutch release bearing apparatus which concerns on Example 1 of this invention. It is the longitudinal cross-sectional view which expands and similarly shows the relationship between a sleeve and a metal core. It is sectional drawing which expands and similarly shows the shrinkage | contraction prevention part between the flange part of a metal core, and the extension cylinder part of a sleeve. It is a longitudinal cross-sectional view which shows the clutch release bearing apparatus which concerns on Example 2 of this invention. It is explanatory drawing which shows other embodiment of the shrinkage | contraction prevention part provided between the flange part of a metal core, and the extension cylinder part of a sleeve.

Explanation of symbols

3 Retainer 7 Release Hawk 10 Cover member 20 Clutch release bearing 21 Outer ring 22 Ball 25 Inner ring 30 Diaphragm spring 40 Sleeve 41 Body cylinder part 42 Extension cylinder part 50 Core metal 51 Flange part 52 Core cylinder part 60 Shrinkage prevention part 61 Concave groove engagement Stop part 65 Engagement part

Claims (2)

A clutch release bearing device disposed between a release fork and a diaphragm spring,
A synthetic resin sleeve that is slidably fitted on the outer peripheral surface of the cylindrical retainer, a cover member that moves integrally with the sleeve, and an inner diameter of the diaphragm spring that is assembled to the cover member A clutch release bearing that contacts and presses the side part,
A core bar for connecting the sleeve to the release fork is attached to the sleeve,
The cored bar integrally includes a core tube part and a flange part projecting radially outward from one end of the core tube part and connected to the release fork,
The sleeve includes a body cylinder portion in which a core tube portion of the core metal is embedded in a wall thickness and extends along an inner peripheral surface of an inner ring of the clutch release bearing, and a direction opposite to the extending direction of the body tube portion And an extension tube part extending to
A shrinkage prevention portion is provided between the flange portion of the cored bar and the extended cylindrical portion of the sleeve to suppress the shrinkage toward the inner diameter side after the sleeve is formed of a synthetic resin material. Clutch release bearing device. The clutch release bearing device according to claim 1,
The shrinkage prevention part is composed of a concave groove-like locking part that is recessed on one side of the flange part, and an engagement part that is filled and molded into the concave groove-like locking part from the extended cylindrical part of the sleeve. A clutch release bearing device comprising:

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