JPH1019059A - Clutch release bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce cost. SOLUTION: An inner ring 21' is bent from its one end to the outside diameter side and is provided with a projecting round contact part 21'b to be brought in contact with the rotational part of a clutch device with the slide movement of a bearing cage body 1, a collar part 21'c bent from the other end to the inside diameter side, and a raceway groove 21'a on which balls are to be rolled. The inner ring 21' is manufactured of a steel plate material through a process of pressing, cold rolling of the racerway groove 21'a, heat treatment, and grinding of the raceway groove 21'.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a clutch release bearing.

[0002]

2. Description of the Related Art A clutch release bearing device is incorporated between an engine of an automobile and a transmission, and has a function of switching on / off of a clutch by sliding on a front cover with operation of a clutch pedal.

A clutch release bearing device is shown in FIG.
As shown in FIG. 1, a bearing holder 1 composed of a sleeve 11, a side plate 12, a cover 13, and an elastic body, for example, a wave spring 14, and a clutch release bearing 2 held by the bearing holder 1.

[0004] The sleeve 11 is made of, for example, resin, and has a cylindrical portion 11a externally inserted into a front cover (projected from the transmission) not shown, and a cylindrical portion 11a.
And a flange portion 11b protruding from the outer periphery of the main body.

[0005] The side plate 12 is a flange portion 1 of the sleeve 11.
1b is attached to one side surface and is fixed integrally with the cover 13. The side plate 12 is a flange 11 of the sleeve 11.
b, and has a contact portion 11c with which a release fork (not shown) contacts.

[0006] One end of the cover 13 is bent to the inner diameter side to form a flange portion 13 a, and the other end 13 b is fixed to the side plate 12 by caulking. A wave spring 14 is interposed inside the flange 13a.

The clutch release bearing 2 includes an inner race 21, an outer race 22, a raceway groove 21a of the inner race 21 and a raceway groove 2 of the outer race 22.
The outer ring 22 is composed of a plurality of balls 23 interposed between the outer ring 2a and a pair of seals 25 fitted to both inner diameters of the outer ring 22. As shown in an enlarged manner in FIG. 5, the inner ring 21 includes a contact portion 21 b bent from one end to the outer diameter side, and a raceway groove 21 a on which the ball 23 rolls, and is provided on the outer periphery of the cylindrical portion 11 a of the sleeve 11. It is loosely fitted with a radial gap S1. The outer ring 22 is loosely fitted to the inner periphery of the cover 13 with a radial gap S2, and the flange portion 13a of the cover 13
Is axially elastically supported between the other end face of the flange portion 11b.

When a clutch pedal (not shown) is depressed, the release fork swings and presses the side plate 12,
The bearing holder 1 and the clutch release bearing 2 move axially along the front cover, and
Abuts against the diaphragm spring of the clutch device and presses and reverses it. Then, due to the elasticity of the diaphragm spring, the pressure plate pressing the clutch disc against the flywheel separates from the clutch disc, and thereby the clutch is released. When the clutch pedal is released, the bearing holder 1 and the clutch release bearing 2 return to their original positions together with the release fork.

The clutch release bearing 2 is held by the bearing holder 1 via an outer ring 22.
Due to the presence of S2, the bearing holder 1 can be moved in the radial direction. For this reason, even if there is an error in assembling between the axis of the front cover and the axis of the output shaft, and the center of rotation of the diaphragm spring and the center of rotation of the clutch release bearing 2 are misaligned, the clutch release bearing will not move. 2 moves in the radial direction by the amount of the error, and automatically aligns the misalignment.

[0010]

At present, the inner ring 21 in the clutch release bearing 2 as described above is forged (cold forged) from a steel material → turning of raceway grooves → heat treatment → grinding of raceway grooves. It is manufactured through press working → heat treatment → grinding of raceway grooves. As the steel material, a bar of chromium steel SCr415 is used in the case of cold forging, and a plate of carburized steel or high carbon steel is used in the case of pressing.

However, in the former case, the cost required for forging is high, and post-processing by turning the raceway groove and the outer shape is necessary, so that it is difficult to reduce the product cost. On the other hand, in the latter case, although the cost is reduced, the shape of the raceway groove cannot be formed with high precision by press working (a one-shoulder groove shape is possible, but a shoulder portion is sagged in the double shoulder groove shape). ), It is not preferable in terms of product quality.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce costs while securing accuracy in an inner ring of a clutch release bearing.

[0013]

The inner ring according to the present invention comprises:
It has an abutment portion that is bent from one end to the outer diameter side and can abut on a rotating member of the clutch device, and a track groove on which the ball rolls,
After pressing from a steel plate material, the raceway grooves are formed by cold rolling.

When the inner ring has a shape having a flange bent from the other end to the inner diameter side, it is advantageous in that press working accuracy is enhanced and deformation due to heat treatment is prevented.

The inner ring as described above is formed by pressing a steel plate material to form a ring having a contact portion bent from one end to the outer diameter side, and then cold rolling a predetermined portion of the ring. It can be manufactured by forming a raceway groove. Alternatively, after pressing a steel sheet material to form a ring having a contact portion bent from one end to the outer diameter side and a flange bent from the other end to the inner diameter side, a predetermined portion of the ring is formed. It can be manufactured by forming a raceway groove by cold rolling.

As the material of the inner ring, it is preferable to use chromium molybdenum steel SCM415M.

[0017]

Embodiments of the present invention will be described below.

The clutch release bearing device shown in FIG.
As in the case shown in FIG. 4, a bearing holder 1 composed of a sleeve 11, a side plate 12, a cover 13 and an elastic body, for example, a wave spring 14, and a clutch release bearing 2 ′ held by the bearing holder 1. Although it is configured, the clutch release bearing 2 ', more specifically, the inner ring 21' is different from that shown in FIG. 4 (FIG. 5). The other components and portions are substantially the same as those shown in FIG. 4, and corresponding components and portions are denoted by the same reference numerals, and redundant description will be omitted.

As shown in FIG. 2, the inner ring 21 'of the clutch release bearing 2' bends from one end to the outer diameter side, and abuts against the rotating member of the clutch device as the bearing holder 1 slides. It has a convex abutting portion 21'b that comes into contact, a flange portion 21'c bent from the other end to the inner diameter side, and a raceway groove 21'a on which the ball 23 rolls. The raceway groove 21'a has a shape having both shoulders. Since the inner ring 21 'of this embodiment has a contact portion 21'b at one end and a flange portion 21'c at the other end,
Compared to the shape of the inner ring 21 of the conventional embodiment shown in FIG. 5 (a shape having no flange at the other end), the rigidity of the left and right sides is better, the press working accuracy is improved, and the heat treatment deformation is prevented. It is advantageous.

The inner ring 21 'is press-formed from a steel plate material.
It is manufactured through a process of cold rolling of the raceway groove 21′a → heat treatment → grinding of the raceway groove 21′a.

In this embodiment, carburized steel is used as the material of the inner ring 21 ', and carburizing and quenching is performed. Examples of the carburized steel include nickel chrome steel (SNC), nickel chrome molybdenum steel (SNCM), chrome steel (SCr), and chromium molybdenum steel (SCM). Among them, nickel chrome steel (SNC), nickel chrome molybdenum steel (S
NCM) is a material that does not easily cause excessive carburization and has excellent mechanical properties.
Since i is included, there is difficulty in terms of cost. Considering the mechanical properties required for the inner ring, SNC steel, SN
With CM steel, there is a feeling of excessive quality, and the cost cannot be balanced. In contrast, chromium molybdenum steel (SC
M) hardly causes excessive carburization, has good hardenability, and is relatively inexpensive compared to SNC steel and SNCM steel. Further, the mechanical characteristics required for the inner ring of the clutch release bearing can be sufficiently satisfied. For these reasons,
Chrome molybdenum steel (SCM) as the material of the inner ring 21 '
Was used. Chrome molybdenum steel (SCM)
Are SCM415, SCM418,
There are SCM420, SCM421, and SCM822, among which SCM415M is most preferable. By the way,
The material of the inner ring in the conventional product is chromium steel SCr415.

Using the SCM415M steel plate, press working → cold rolling is performed in the manner shown in FIG. In the press working, the contact portion 21'b, the flange portion 21'c, the inner diameter, and the outer diameter are formed into predetermined shapes and dimensions. After the completion of the press working, the raceway groove 21'a is formed into a predetermined shape and dimensions by cold rolling. Cold rolling is
As is well-known, a mandrel and a forming roll sandwich a ring-shaped work from the inner and outer diameter directions, and press the rotating rolled forming roll against the mandrel, thereby rolling the work while pressing and rotating the work at room temperature. Is performed. By forming the raceway groove 21'a by cold rolling, the shape and dimensions of the raceway groove 21'a can be accurately finished. Therefore, the turning of the raceway groove is not required as compared with the conventional cold forging, so that the manufacturing cost is reduced.

After the press working and the cold rolling work are performed as described above, a carburizing and quenching treatment is performed. As described above, the inner ring 21 'has an abutting portion 21'b at one end,
It has a flange 21'c at the other end, and has a good balance of right and left stiffness. Therefore, as compared with the shape of the inner ring 21 of the conventional embodiment shown in FIG. Deformation is less likely to occur. After the heat treatment, grinding of the raceway groove 21'a completes the inner race 21 'shown in FIG.

In the embodiment described above, the inner ring 21 'has a flange 21'c bent from the other end to the inner diameter side. However, the inner ring 21' may have a shape without such a flange. Further, the present invention relates to a clutch release bearing and an inner ring thereof, and the structure of the bearing holder is not limited to the illustrated one.

[0025]

As described above, according to the present invention,
Since the inner ring is formed by using both the pressing and the rolling of the raceway groove, the manufacturing cost of the inner race can be reduced and the accuracy of the raceway groove can be secured. In addition, since the inner ring has a shape having a contact portion at one end and a flange portion at the other end, the rigidity of the right and left sides is improved, so that the press working accuracy can be improved and the heat treatment deformation can be suppressed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a clutch release bearing device according to an embodiment.

FIG. 2 is an enlarged sectional view of an inner ring.

FIG. 3 is a diagram showing a manufacturing process of the inner ring.

FIG. 4 is a cross-sectional view showing a clutch release bearing device according to a conventional embodiment.

FIG. 5 is an enlarged sectional view of a conventional inner race.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bearing holding body 2 Clutch release bearing 21 Inner ring 21a Track groove 21b Contact part 21c Flange part

Claims (11)

[Claims] An inner ring loosely fitted with a radial gap to a bearing holder sliding on a front cover by abutment of a release fork, and an inner ring loosely fitted to the bearing holder with a radial gap and being elastic in the axial direction. In a clutch release bearing including a supported outer ring, the inner ring is bent from one end to the outer diameter side, and a contact portion that contacts a rotating member of a clutch device as the bearing holder slides, A clutch release bearing having a rolling groove and a rolling groove formed by cold rolling after pressing from a steel plate material. 2. The clutch release bearing according to claim 1, wherein the inner ring further has a flange portion bent from the other end to the inner diameter side. 3. An inner ring which is loosely fitted with a radial gap to a bearing holder sliding on a front cover by contact of a release fork, and which is loosely fitted to said bearing holder with a radial gap and is elastic in the axial direction. A clutch release bearing including a supported outer ring, wherein the inner ring is bent from one end to an outer diameter side, and a contact portion that contacts a rotating member of a clutch device as the bearing holder slides; A clutch release bearing having a flange portion bent to the inner diameter side from the shaft and a raceway groove on which the ball rolls. 4. The clutch release bearing according to claim 1, wherein said inner race is made of SCM415M steel. 5. A contact portion which is bent from one end to an outer diameter side and which can contact a rotating member of a clutch device, and a raceway groove on which a ball rolls. Inner ring for clutch release bearings with raceway grooves formed by cold rolling. 6. The inner ring for a clutch release bearing according to claim 5, further comprising a flange portion bent from the other end to the inner diameter side. 7. A contact portion bent from one end to the outer diameter side and capable of contacting the rotating member of the clutch device, a flange portion bent from the other end to the inner diameter side, and a raceway groove on which the ball rolls. Inner ring for clutch release bearing. 8. The steel according to claim 5, which is made of SCM415M steel.
Or an inner ring for a clutch release bearing according to 7. 9. A steel plate material is pressed to form an annular body having an abutting portion bent from one end to the outer diameter side, and then a predetermined portion of the annular body is cold-rolled to form a raceway groove. Of manufacturing inner ring for clutch release bearing. 10. A steel plate material is pressed to form a ring having a contact portion bent from one end to the outside diameter side and a flange bent from the other end to the inside diameter side. A method for manufacturing an inner ring for a clutch release bearing, in which a predetermined portion is cold-rolled to form a raceway groove. 11. The method for manufacturing an inner race for a clutch release bearing according to claim 9, wherein the steel plate material is an SCM415M steel plate.