JP2002147494A - Clutch release bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clutch release bearing device capable of maintaining a sealing effect of a lubricant in spite of a low cost. SOLUTION: In this bearing device, an outer ring 12 is made of a plate material formed by pressing, seals 17, 18 comprising core metals 17a, 18a and rubbers 17b, 18b are pressed and fitted in the inner circumference of the outer ring 12, and the rubbers 17b, 18b are interposed between the core metals 17a, 18a and the inner circumference of the outer ring 12 in an installed state. Thereby, the outer ring 12 is formed without forming an installing groove to reduce the cost, and the interposition of the rubbers 17b, 18b between the core metals 17a, 18a and the inner circumferential face of the outer ring 12 can suppress grease leakage or the like from between the core metals 17a, 18a and the inner circumferential face of the outer ring 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a clutch release bearing device.

[0002]

2. Description of the Related Art When operating a clutch mounted on a vehicle or the like, which is a power interrupting device using a friction plate, a diaphragm fork of a clutch cover is pressed in an axial direction by a release fork as an input member, so that the spring is pressed. Power is disconnected by releasing the biasing force from the friction plate.

[0003] The release fork is usually arranged on a fixed side of a vehicle body or the like, but a clutch cover is attached to a flywheel or the like of an engine so as to rotate integrally therewith. Therefore, when the release fork directly presses the diaphragm spring of the clutch cover, the contact portion is worn. Therefore, a clutch release bearing including a rotating wheel that abuts against a diaphragm spring and rotates integrally, and a non-rotating bearing holding member that holds the bearing in a predetermined state and receives an input from a release fork. The clutch release bearing device consisting of
As shown in JP-A-6-7124, it is provided between a diaphragm spring and a release fork.

In the clutch release bearing device disclosed in Japanese Utility Model Laid-Open Publication No. 56-7124, the tip of the outer ring of the bearing faces the diaphragm spring, while the flange at the rear end of the inner ring of the bearing has a guide. It is provided to face the flange of the sleeve. The bearing is attached to the guide sleeve such that the flange portions are sandwiched in the axial direction by a leaf spring. When the flange of the guide sleeve is pushed from the rear by the tip of the release fork, the entire bearing device is movable in the axial direction so that the tip of the outer ring comes into contact with the diaphragm spring.

Here, the flange portion of the inner ring is urged by a leaf spring so as to be movable in the radial direction with respect to the flange portion of the guide sleeve, so that the flange portion of the guide sleeve is pressed against the release fork from behind. Then, when the outer ring of the bearing comes into contact with the diaphragm spring of the clutch, the bearing is automatically aligned even if there is eccentricity between them.

[0006]

In the prior art clutch release bearing device, a groove is formed on the inner periphery of the outer ring by cutting, and the outer periphery of the core of the seal is engaged in the groove to form the seal. The installation is done. However, there is a problem that it is costly to perform cutting on the inner periphery of the outer ring. It is also conceivable to omit such a groove and directly fit the seal core to the inner periphery of the outer ring, but the lubricant filled in the bearing leaks out from between the core and the inner periphery. There is fear.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a clutch release bearing device which can maintain a sealing effect of a lubricant despite low cost.

[0008]

In order to achieve the above object,
The clutch release bearing device of the present invention includes an inner ring and an outer ring that are concentrically arranged and relatively rotate with each other, one of the wheels is fixed, and the other rotating wheel comes into contact with a rotating member of the clutch device. A clutch release bearing, a resin-made bearing holding member having a cylindrical portion slidably fitted on a guide shaft, and a flange portion, and one of the clutch release bearings with respect to the bearing holding member. In a clutch release bearing device comprising a connecting member for holding the wheel so as to be movable in the radial direction, the outer ring is made of a plate material formed by pressing, and a core metal and an elastic member are provided on the inner periphery of the outer ring. The elastic member is interposed between the inner peripheral surface of the outer ring and the core metal in a state where the seal including the member is fitted by press-fitting and assembled. That.

[0009]

The clutch release bearing device of the present invention includes an inner ring and an outer ring which are concentrically arranged and rotate relative to each other, one of which is fixed, and the other of which rotates contacts the rotating member of the clutch device. A clutch release bearing, a cylindrical portion fitted slidably on the guide shaft, and a resin bearing holding member having a flange portion,
A clutch release bearing device comprising a coupling member for holding the one ring of the clutch release bearing so as to be movable in a radial direction with respect to the bearing holding member, wherein the outer ring is formed by pressing; A seal made of a plate material and made of a core metal and an elastic member is fitted to the inner periphery of the outer ring by press-fitting, and in an assembled state, the elastic member is provided between the inner peripheral surface of the outer ring and the core bar. Since the member is interposed, the cost can be reduced by forming the outer ring without providing the mounting groove, and the elastic member is provided between the inner peripheral surface of the outer ring and the core metal. The leakage of the lubricating oil through the space can be suppressed. Further, since the outer ring is formed by pressing a plate material, the cost can be further reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a view of a clutch release bearing device according to an embodiment of the present invention as viewed from a release fork side. FIG. 2 is an axial sectional view taken along the line II-II of FIG. 1 and viewed in the direction of the arrow.

In FIG. 2, the clutch release bearing device comprises a clutch release bearing 10, a guide sleeve 20 as a bearing holding member, and a spring member 30 as a connecting member. The clutch release bearing 10 includes a substantially tubular inner ring 11 having a contact portion 11a at the left end, a short tubular outer ring 12 concentrically enclosing the inner ring 11, and a roller between the inner ring 11 and the outer ring 12. A plurality of balls 15 movably arranged
And a retainer 16 which is a resin molded product for retaining the balls 15 at predetermined intervals, and a seal 1 for sealing a space defined by the inner ring 11 and the outer ring 12 on both axial sides of the ball 15.
7 and 18. The inner race 11 is rotatably supported by the outer race 12. Also, the contact portion 11a of the inner ring 11
Has a shape that is turned outward in the radial direction, and comes into contact with a diaphragm spring of a clutch cover (not shown). The inner ring 11 is entirely quenched or carbonitrided after press forming, but the end of the inner ring 11 opposite to the abutting portion 11a is left blank by pressing, and cutting is performed. The production cost is reduced without doing it. Further, the outer ring 12 is formed by pressing a plate material. However, the outer ring 12 may be formed by turning using SUJ2 of the JIS standard as a raw material and then quenching.

On the other hand, the guide sleeve 20 is made of molded resin and has a cylindrical main body 21 and a main body 21.
Flange portion 2 extending radially from the outer periphery near the center of
2, an outer wall portion 23 protruding leftward in the axial direction at a radially outer end of the flange portion 22, and a guide portion 25 protruding axially at a radially outer end of the flange portion 22.
(FIG. 1). A guide shaft (not shown) extends inside the main body 21, and the main body 21 is slidable on the guide shaft. Note that the enlarged diameter portion 24 is provided inside the main body 21.
Is provided. The enlarged diameter portion 24 functions to prevent foreign matter from being caught when the main body 21 slides on the guide shaft. The outer wall portion 23 is provided with the clutch release bearing 1.
0, and serves as a movement restricting portion in the radial direction. Further, a gap 27 is formed between the outer periphery of the outer race 12 and the inner periphery of the outer wall 23 so that the clutch release bearing 10 can be moved in the radial direction. Flange part 22
A horizontal groove 26 is provided in the middle of the frame, and a clip (not shown) for fixing a release fork is inserted into the horizontal groove 26.

As apparent from FIG. 1, the spring member 30 provided with two members having the same shape has a function of attaching the clutch release bearing 10 to the guide sleeve 20. The stopper 22g of the guide sleeve 20 engages with the notch 38 of the spring member 30 when the spring member 30 is attached to the guide sleeve 20, and the spring member 3
It functions to prevent 0 from being pushed inward.

As shown in FIGS. 1 and 2, the guide sleeve 2
A reinforcement member 40 is provided on the side of the release fork 0. The reinforcing member 40 includes a cylindrical portion 41, a plate-shaped anvil portion 42 protruding upward and downward from substantially the center of the cylindrical portion 41, and a flange portion 43 extending radially from an end of the cylindrical portion 41. Is formed by pressing a relatively thin plate, followed by quenching. This prevents remarkable wear from occurring at the contact portion with the release fork.

When the cylindrical portion 41 is attached to the guide sleeve 20, the cylindrical portion 41 is fitted to the main body 21 with a gap therebetween, so that the cylindrical portion 41 can resiliently support the guide sleeve 20 when receiving a load. I have. Cylindrical part 4
The upper and lower portions 1 are extended to correspond to the anvil portion 42 to form a rectangular portion 41a (FIG. 1). The rectangular portion 41a has a function of guiding the release fork and a function of ensuring rigidity of the anvil portion.

As shown in FIG. 1, the flange 43 of the reinforcing member 40 has a rectangular notch 43a formed in a circumferential portion thereof.
Projection 22 formed at a corresponding position of the flange portion 22
By engaging with f, rotation prevention and positioning of the reinforcing member 40 are achieved.

FIG. 3 is an enlarged view showing the clutch release bearing 10 of the clutch release bearing device according to the present embodiment. In FIG. 3, seals 17 and 18 are each made of a core metal (for example, SPCC according to JIS).
7a and 18a, and rubber (for example, heat-resistant NBR) 17b and 18b, which is an elastic member coated on the outside thereof. As shown in FIG. 3, the lip portions 17 c, 18 c, which are parts of the rubbers 17 b, 18 b, extending from the lower ends (inward in the radial direction) of the metal cores 17 a, 18 a in the figure are formed on the outer peripheral surface or end surface of the inner race 11. Contact (small contact) with a slight pressing force to form a so-called fine contact seal. Grease or the like is filled in the clutch release bearing 10 as a lubricant. The fine contact seal will be described below.

According to the analysis of the present inventors, in the lip portions 17c and 18c of the present embodiment in a so-called slight contact state, the ratio of the sealing resistance to the rotational torque of the entire clutch release bearing 10 is affected by the effect. Temperature range (-4
(0 ° C to 120 ° C), it has been found to be about 5 to 40%. Here, especially at extremely low temperatures, the sealing resistance also increases, but the stirring resistance caused by the solidified grease increases more remarkably, so that the sealing resistance occupies the entire rotation torque of the clutch release bearing 10. The ratio becomes as small as 10% or less. Therefore, the rotational torque of the clutch release bearing 10 does not greatly increase as compared with the case where the non-contact seal is provided.

On the other hand, when the operating temperature rises, the grease becomes semi-fluidized and the stirring resistance of the grease is greatly reduced.
The ratio of the seal resistance to the total rotational torque is 0,
It increases to about 40%. However, in such a case,
Since the rotational torque of the entire clutch release bearing 10 is greatly reduced, problems such as rubbing noise at the time of clutch release are less likely to occur.

Here, since the operating temperature generally rises during the operation of the clutch release bearing 10, it is possible to effectively prevent the intrusion of foreign matter from the outside in such a state, thereby extending the life of the bearing. It is important in doing. In the present embodiment, since the fine contact seal is formed in such a state, it is possible to effectively prevent foreign matter from entering, thereby extending the life of the bearing.

Further, since the cross-sectional shape of the tips of the lip portions 17c and 18c is triangular, the lip portions 17c and 18c have
Even if the pressing force of 8c is low, the surface pressure at the tip portion increases, and therefore, even with a slight squeezing, the intrusion of foreign matter can be more effectively prevented.

Next, the operation of the clutch release bearing device according to the embodiment of the present invention will be described below. In FIG. 1, a release fork (not shown) pivots, and its tip abuts on the anvil portion 42 of the reinforcing member 40 to apply a constant load. Since the reinforcing member 40 is relatively thick and has sufficient rigidity, it can receive a large load received from the release fork. The clutch release bearing device slides in the axial direction on a guide shaft (not shown) in response to an input from a release fork to bring the contact portion 11a of the inner ring 11 into contact with a diaphragm spring of a clutch cover (not shown). In such a case, even if the diaphragm spring is rotating, the inner ring 11 is rotatable, so that the inner ring 11 rotates together with the diaphragm spring after the contact, and furthermore, the diaphragm spring is pressed by the axial movement of the bearing device. Then, the clutch is operated.

The spring member 30 has an appropriate thickness.
The clutch release bearing 10 with respect to the guide sleeve 20
Is supported only by the frictional force acting between the pressing portion 32 and the outer ring 12, so that the bearing 10 can move in the radial direction with respect to the guide sleeve 20. Therefore, when the contact portion 11a of the inner ring 11 contacts the diaphragm spring, if there is eccentricity between the two, a known force for positioning the bearing 10 concentrically occurs, whereby the bearing 10 is moved in the radial direction. And self-centering will be achieved.
The outer wall portion 23 of the guide sleeve 20 has a function of restricting the bearing 10 from moving outward in the radial direction by a predetermined amount or more. In addition, since the outer ring of a general ball bearing does not have a flange in many cases, if the outer ring is sandwiched by the spring member 30 as in the present embodiment, it is not necessary to modify the outer ring itself and an existing one is used. It can contribute to cost reduction.

According to the present embodiment, the outer ring 12 is made of a plate material formed by pressing, and
In a state where the seals 17 and 18 composed of the cores 17a and 18a and the rubbers 17b and 18b are fitted by press-fitting and assembled, the rubbers 17b and 18b are provided between the inner peripheral surface of the outer race 12 and the cores 17a and 18a. Since the outer ring 18b is interposed, the cost can be reduced by forming the outer ring 12 without providing a groove for attachment, and between the inner peripheral surface of the outer ring 12 and the metal cores 17a, 18a, By interposing the rubbers 17b and 18b, it is possible to suppress leakage of grease between them.

FIG. 4 is a sectional view similar to FIG. 3 of a clutch release bearing 110 according to the second embodiment.
Clutch release bearing 110 according to the second embodiment
Can be used in place of the clutch release bearing 10 of FIGS. 1 and 2, and only the configuration of the outer ring and the seal is different. Therefore, the description of the configuration and effect common to the clutch release bearing 10 of FIG. 3 will be omitted.

In FIG. 4, the outer ring 12 is formed by pressing a plate material and then subjected to a heat treatment such as quenching, but the inner diameter can be arbitrarily set by drawing. In the present embodiment, a flange portion 112a is formed at the right end in the figure. Inside the flange portion 112a (left side in the figure), a seal 1 made of only a metal core having a U-shaped cross section is provided.
18 are attached. Thereby, the cost of the seal can be reduced. Note that the seal 17 is a fine contact seal similar to the above-described embodiment.

According to the present embodiment, the interior of the clutch release bearing 10 is filled with grease and the seal 11
Although there is a gap A between the inner circumference (the lower edge in the figure) of the inner ring 8 and the outer circumference of the inner ring 11, there is no other air inlet, so that leakage of grease from the gap A is suppressed. In addition, foreign matter can be prevented from entering the clutch release bearing 10 from the outside through the gap A.

As described above, the present invention has been described with reference to the embodiments. However, the present invention should not be construed as being limited to the above embodiments, and it is needless to say that the present invention can be appropriately changed and improved. For example, in the above-described embodiment, the seal 17 or 18 is a fine contact seal, but a normal seal may be used.

[0029]

The clutch release bearing device of the present invention
A clutch release bearing including an inner ring and an outer ring concentrically arranged and rotating relative to each other, one of which is fixed, and the other of which rotates is in contact with a rotating member of the clutch device; A resin-made bearing holding member having a cylindrical portion slidably fitted on the bearing and a flange portion, and the one ring of the clutch release bearing can be moved in a radial direction with respect to the bearing holding member. In the clutch release bearing device comprising a connecting member for holding the outer ring, the outer ring is made of a plate material formed by pressing, and a seal made of a cored bar and an elastic member is fitted on the inner periphery of the outer ring by press fitting. In the assembled state,
Since the elastic member is interposed between the inner peripheral surface of the outer ring and the core metal, the cost can be reduced by forming the outer ring without providing a mounting groove,
By interposing the elastic member between the inner peripheral surface of the outer ring and the core, leakage of lubricating oil through the elastic member can be suppressed. Further, since the outer ring is formed by pressing a plate material, the cost can be further reduced.

[Brief description of the drawings]

FIG. 1 is a view of a clutch release bearing device according to an embodiment of the present invention as viewed from a release fork side.

FIG. 2 is an axial sectional view taken along the line II-II of FIG. 1 and viewed in a direction indicated by an arrow.

3 is an axial sectional view of the clutch release bearing 10. FIG.

FIG. 4 is an axial sectional view of the clutch release bearing 110.

[Explanation of symbols]

 10, 110 Clutch release bearing 17, 18, 118 Seal 17a, 18a Core 17b, 18b Rubber 17c, 18c Lip 20 Guide sleeve 30 Spring member 40 Reinforcement member

Continued on the front page F term (reference) 3J016 AA02 BB03 CA02 3J056 AA33 AA62 BA04 BC02 BE23 CC19 FA02 FA03 FA11 GA02 GA12

Claims (1)

[Claims] 1. A clutch release bearing comprising an inner ring and an outer ring which are concentrically arranged and rotate relative to each other, one of which is fixed and the other of which rotates is in contact with a rotating member of a clutch device. And a cylindrical bearing part slidably fitted on a guide shaft, a resin-made bearing holding member having a flange part, and the one ring of the clutch release bearing having a radius relative to the bearing holding member. In a clutch release bearing device comprising a connecting member that is held so as to be movable in the direction, the outer ring is made of a plate material formed by pressing, and an inner periphery of the outer ring is made up of a cored bar and an elastic member. A clutch release bearing device wherein the elastic member is interposed between the inner peripheral surface of the outer race and the core metal when the seal is fitted by press-fitting and assembled.