192 clutches and power-stop control – Clutches – Operators
Patent
1992-01-07
1993-08-31
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Operators
192 98, F16D 2314, F16D 1371
Patent
active
052400972
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a pull-type clutch, and particularly to a mechanism for connecting an inner peripheral part of a diaphragm spring and a release bearing.
BACKGROUND ART
As is generally known, a diaphragm spring is a component for urging a pressure plate toward a friction facing of a clutch disc. A pull-type clutch is so designed that an inner peripheral part of the diaphragm spring is connected to a release bearing and is moved backward in an axial direction of the clutch when the release bearing is moved in an axial direction away from a flywheel (backward in the axial direction). The clutch is thus disengaged.
An example of a conventional pull-type clutch is shown in FIG. 5. In such clutch, a clutch disc 12 is fixed to a clutch output shaft 11 and, a friction facing 13 provided at an outer periphery of the clutch disc 12 is urged toward a flywheel 15 by a pressure plate 14, to engage the clutch. An annular diaphragm spring 9 is positioned at an axial backside of the pressure plate 14, and urges the pressure plate 14 toward the facing 13. A radial peripheral portion of the diaphragm spring 9 contacts the pressure plate 14 and is supported by a fulcrum point 17 of a clutch cover 16 secured to the flywheel 15. The diaphragm spring 9 has radial slits 10 extending from radial intermediate portions to inner peripheral parts 9a, and the inner peripheral parts 9a are connected to a release bearing 1. The release bearing 1 fits onto an outer periphery of the clutch output shaft 11 through a sleeve 20. A lever 18 connected to a clutch pedal (not shown), moves release bearing 1 backward in the axial direction when the clutch pedal is depressed.
A mechanism connecting release bearing 1 and the inner peripheral part 9a of the diaphragm spring 9, in the conventional pull-type clutch, is shown in FIG. 6 in an enlarged manner. A wedge collar 2 fits onto an outer periphery of the release bearing 1 (inner race portion). The wedge collar 2 has a radial outward flange 2a at its radial axial backside end. A substantially V-shaped bent portion 2b formed at an axial forward tip end, fits onto a substantially V-shaped groove 1a formed at an axial forward tip end of the release bearing 1. An outer peripheral surface of the bent portion 2b has an annular groove 2c. A snap ring 3 is attached to the groove 2c. An axial forward tip end 2d of the wedge collar 2 extends forward in the axial direction and opens into a tapered shape relative to the snap ring 3. The snap ring 3 is thereby prevented from slipping off, in the axial forward direction, from the wedge collar 2.
Lever plate 4 is installed on an outer periphery of the wedge collar 2 with the snap ring 3 therebetween. The lever plate 4 integrally has a radial outward flange 5 at an axial forward end of a cylindrical body. FIG. 7 is a view showing the entire lever plate 4 viewing in a direction VII of FIG. 6, and, FIG. 8 is a sectional view taken on a line VIII--VIII of FIG. 7. The flange 5 includes, at its intermediate portion an extension 50 which has an arcuate section extending backward in the axial direction of flange 5. In lever plate 4, FIG. 6 an annular stepped part 4a which engages with the snap ring 3 from the axial backside, is formed on a surface facing on an outer periphery of the wedge collar 2, and a tapered guide surface 4b is formed on an inner peripheral end adjacent to the tip end 2d of wedge collar 2. Because the wedge collar 2 is fit onto the outer periphery of the release bearing 1 and the lever plate 4 is fit onto the outer periphery of the wedge collar 2, so as to engage with the snap ring 3 at the stepped part 4a, as described above, the wedge collar 2 is moved together with and in the same direction as the lever plate 4 when the release bearing 1 is moved backward in the axial direction.
The flange 5 is coupled, by a retainer plate 6, to the diaphragm spring 9 immovably in axial forward and backward directions. The retainer plate 6 integrally contains axially forward bent projections 8, at plural places, on a radial outer per
REFERENCES:
patent: 4109773 (1978-08-01), Higgerson et al.
patent: 4643286 (1987-02-01), Lassiaz
patent: 4646901 (1987-03-01), Lassiaz et al.
patent: 4660701 (1987-04-01), Lassiaz et al.
patent: 4718528 (1988-01-01), Caron et al.
patent: 4832166 (1989-05-01), Parzefall
Asada Masaaki
Kajitani Koji
Yoshimura Yoshinari
Bonck Rodney H.
Kabushiki Kaisha Daikin Seisakosho
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