192 clutches and power-stop control – Clutches – Operators
Patent
1989-11-17
1991-08-13
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Operators
464 64, F16D 1364, F16F 1512, F16F 1530
Patent
active
050389068
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a clutch disc assembly for passenger cars, or the like.
BACKGROUND ART
A conventional clutch disc assembly of this type, an arrangement shown in FIG. 5 has already known. In the arrangement of FIG. 5, a hub 100 has an integral outwardly extending outer flange 101 formed therearound. The outer flange 101 has a pair of side plates 102 rotatably disposed at opposite sides of the outer flange 101. The outer flange 101 and side plates 102 have, respectively, formed therein openings 103 and 104 aligned with each other at equal distance in a circumferential direction. The openings 103 and 104 have disposed therein a coil spring mechanisms 105 compressibly in the circumferential direction. One of the side plates 102 is a clutch plate and has fastened thereto a friction facing 106 by way of cushioning plates 107.
According to the above mentioned arrangement, torque of an engine is transmitted to the side plates 102 by way of the friction facing 106, and therefrom to outer flange 101 by way of coil spring mechanisms 105 disposed in the openings 103 and 104, and an output shaft (not shown).
As shown in FIG. l6, in the foregoing arrangement, there are many cases that the coil spring mechanisms consist of concentrically arranged compressible coil springs 110 and 120 of respecitively large and small diameters. The springs 110 and 120 have, respectively, high and low spring constants for a multi-stage characteristic.
However, in such conventional arrangement, because the small diameter spring 110 is compressed during whole stages, compressing quantity of the small diameter spring 110, and therefore the stress thereon, are too large. The small diameter spring 110 may also mesh with the large diameter spring 120 which causes the large diameter spring 120 to the affected when the small diameter spring 110 receives centrifugal force, urging the spring 110 to a radially outer direction.
The small and large diameter springs may be arranged in series (e.g. U.S. Pat. No. 4,690,660).
However, when so arranged the circumferential distance of the openings and the spring mechanisms become large and the outer flange must be designed to maintain durability despite the circumferentially elongated openings. Thus, the arrangement is difficult to carry.
DISCLOSURE OF THE INVENTION
In a clutch disc assembly having openings in which coil spring mechanisms are disposed and, respectively, high and low spring constants for multi-stage characteristic, an object of this invention is to obtain two stages from an opening by utilizing an inner space with a large diameter spring.
Another object of this invention is to maintain the durability of the outer frange formed the hub.
Another object of this invention is to prevent the small diameter spring from meshing with large diameter spring.
Another object of this invention is to prevent the small diameter spring from over compressing.
As shown in FIGS. 1-3, a clutch disc assembly comprising a hub 1 is spline fitted onto an output shaft and has an outer flange 2 formed on the hub 1 a clutch plate 4 and retaining plate 7, respectively, rotatably disposed at opposite sides of the outer flange 2 with openings 8 and 9 aligned with each other at equal distance in a circumferential direction. A large diameter spring 19, of high spring constant, is disposed in the openings 8 and 9. The outer flange 2 has a circumferentially long opening 3, aligned with the openings 8 and 9, the circumferential width W1 being wider than width W2 of openings 8 and 9 so as to have a space corresponding to a torsion angle .theta.1 when the clutch is neutral. The large diameter spring 19 has a hat-shaped first spring seat 20, having an integral radially extending flange portion 24 through which the large diameter spring is compressed, a cylindrical portion 22 which goes in the large diameter spring 19 and a bottom portion 23, formed integrally at the top of the cylindrical portion 22. A small diameter spring 40 of low spring constant has one of its end portions disposed in the cylin
REFERENCES:
patent: 2158244 (1939-05-01), Mistretta et al.
patent: 2920733 (1960-01-01), Lysett
patent: 4591348 (1986-05-01), Takeuchi et al.
patent: 4690660 (1987-09-01), Hashimoto
patent: 4743217 (1988-05-01), Tojima et al.
patent: 4884996 (1989-12-01), Schmitt et al.
Bonck Rodney H.
Kabushiki Kaisha Daikin Seisakusho
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