JPH0322579Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The invention relates to a self-aligning clutch release bearing with a plastic sleeve.

[Conventional technology]

The clutch release bearing 1 is installed between the engine and transmission of an automobile.
As shown in FIG. 1, it is mounted on a front cover 3 protruding from the transmission 2 so as to be slidable in the axial direction. When the clutch pedal is depressed, the bifurcated release fork 4 presses the clutch release bearing 1 to the left in FIG. Due to the elasticity of the spring 5, the pressure plate 8 that presses the clutch disk 6 against the flywheel 7 separates from the clutch disk 6, releasing the clutch, and the rotation of the engine's output shaft 9 is transmitted to the transmission 2 side. It is becoming more and more difficult to do so. FIGS. 6 and 7 show the construction of a conventional self-aligning clutch release bearing that is incorporated into a clutch such as the one described above. In the figure, the clutch release bearing has a cylindrical sleeve 11 whose inner diameter serves to slide the front cover 3, and a flange 10 on the outer circumferential surface, and a cylindrical sleeve 11 with a flange 10 provided on the outer circumferential surface, and a cylindrical sleeve 11 whose inner diameter serves to slide the front cover 3. The mounted side plate 12, the ball bearing 13 fitted onto the sleeve 11 on the other side of the flange portion 10, and the cover 1 covering the outer periphery of the ball bearing 13.
4 and a wave spring 15 interposed between the end of the cover 14 and the ball bearing 13. The side plate 12 is a press-molded steel plate having a guide surface for the release fork 4, and is hardened to reinforce the flange portion 10 and prevent the contact portion with the release fork 4 from being worn out. The ball bearing 13 consists of an inner ring 16, an outer ring 17, balls 18, a retainer 19, and seals 20, 21, and the inner ring 16 has a semicircular contact portion 16a that contacts the diaphragm spring 5 of the clutch.
is provided. A press-molded cover 14 covering the outside of the ball bearing 13 has a plurality of claws 22 provided on its outer periphery to secure the flange portion 10 and the flange portion 12a of the side plate 12 in an overlapping state by caulking. Therefore, the sleeve 11, the side plate 12 and the cover 1
4 are fixed and integrated, and a wave spring 15 installed between the bending piece 14a provided at the free end of the cover 14 and the outer ring 17 causes the outer ring 17 to
is held in the axial direction between the flange portion 10 and the wave spring 15. A predetermined gap 23 is provided in advance between the inner diameter of the cover 14 and the outer diameter of the outer ring 17 of the ball bearing 13, so that the ball bearing 13 can move in the radial direction. Therefore, even if there is an assembly error between the axial center of the front cover 3 and the rotation center of the output shaft a,
The ball bearing 13 produces an alignment action that automatically moves in the radial direction by the amount of eccentricity, and this alignment position is pressed and held by the wave spring 15, so that even if vibrations, shocks, etc. are applied to the automobile, the ball bearing 13 The alignment state of 13 will not collapse. In the clutch release bearing as mentioned above,
The sleeve 11 was generally formed using a metal material, but in recent years, in order to further reduce wear and improve sliding properties (clutch feeling) of the front cover 3, and further reduce weight,
There has been a shift towards forming the sleeve 11 from a plastic molding.

[Problem that the inventor tries to solve]

However, the contact portion of the side plate with the release fork becomes abrasive with the passage of operating time, resulting in an increase in slip resistance, resulting in fluctuations in the clutch pedal force and an increase in the pedal force.

[Means to solve the problem]

In order to solve the above problems, this idea
A plastic sleeve having a flange around its outer periphery, a back-up spring attached to one side of the flange, a ball bearing placed on the other side of the flange on the outer periphery of the sleeve, and the flange and the ball. a cover disposed to cover the outer periphery of the bearing; and a spring means disposed between an end of the cover and the facing surface of the ball bearing for pressing and holding the ball bearing in the axial direction by the back-up spring; A sliding member is attached to the release fork abutting portion of the flange portion of the sleeve in a freely floating manner.

[Effect]

The ball bearing, which is fitted onto the outside of the plastic sleeve, is held between a back spring and a spring, and is held in the axial direction only by the elastic force of the spring, so it is self-aligning with respect to the output shaft on the engine side. conduct. Further, in the flange portion of the sleeve, since the sliding member is attached so as to be able to float only at the fork abutting portion, there is no relative slippage between the fork and this sliding member, and the sliding member slides between the back-up springs.

【Example】

This invention will be explained below based on the embodiments shown in FIGS. 2 to 5 of the accompanying drawings. As shown in the figure, the clutch release bearing includes a plastic sleeve 32 having a flange portion 31 around its outer periphery, a back-up spring 33 attached to one side of the flange portion 31, and the sleeve 3.
a ball bearing 34 disposed on the other side of the flange portion 31 on the outer periphery of the flange portion 31;
A cover 35 arranged to cover the outer periphery of 4;
A wave spring 36 is interposed between the end of the cover 35 and the ball bearing 34, and a wave spring 36 is attached to the sleeve 32.
and a sliding member 37 with which the release fork 4 comes into contact. The plastic sleeve 32 is made up of a cylindrical portion 38 that is fitted onto the front cover 3, and a disk-shaped flange portion 31 provided on the outer periphery of the cylindrical portion 38. A window portion 39 for accommodating the sliding member 37 is formed in the plastic sleeve 32. ,
A slight gap c is provided so that the sliding member 37 can freely slide on the plane of the flange portion 31. When the release fork 4 makes contact and the ball bearing 34 aligns, the structure allows relative sliding between the back spring 33 and the sliding member 37, so there is no relative sliding between the release fork 4 and the sliding member 37. It becomes less.

【effect】

As described above, the above-described configuration according to this invention has the following effects. (1) Since the release fork abutment part is made freely floating, uneven wear can be prevented, the clutch pedal force becomes stable, and the pedal force itself can be reduced. (2) Since the release fork abutment part is made of a separate member, it is easier to select a member with low sliding resistance and wear resistance. (2) Since the release fork abutment part is made freely floating, the wear part can be dispersed and the amount of wear itself can be reduced.

[Brief explanation of the drawing]

Fig. 1 is an explanatory view showing how a self-aligning clutch release bearing is used, Fig. 2 is a sectional view of the bearing according to this invention, Fig. 3 is a front view of the bearing according to this invention, and Fig. 4 is a Sectional view taken along line X-X in Figure 3, No. 5
The figure is also a cross-sectional view along Y-Y, Figure 6 is a front view showing a conventional bearing, and Figure 7 is a cross-sectional view of the conventional bearing.
It is a sectional view along -V. 31...Flange part, 32...Sleeve, 33
... Backup spring, 34 ... Ball bearing, 35
... Cover, 36 ... Wave spring, 37 ... Sliding member, 39 ... Window section.

Claims (1)

[Scope of utility model registration request] A plastic sleeve having a flange around its outer periphery, a back-up spring attached to one side of the flange, a ball bearing placed on the other side of the flange on the outer periphery of the sleeve, and the flange and the ball. a cover disposed to cover the outer periphery of the bearing; and a spring means disposed between an end of the cover and the facing surface of the ball bearing for pressing and holding the ball bearing in the axial direction by the back-up spring. 1. A clutch release bearing having a plastic sleeve, characterized in that a sliding member is mounted in a freely floating manner on a release fork abutment portion in a flange portion of the sleeve.