Clutch disc structure

Details Clutch disc structure Clutch disc structure

1983-06-21

1985-12-24

Yeung, James C.

192 clutches and power-stop control

Clutches

Operators

464 66, 464 68, F16D 314

Patent

active

045600546

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to the structure of a clutch disc in a clutch apparatus for an automobile, which clutch apparatus is constructed for absorbing a torque variation occurring during idling.


BACKGROUND ART

During transmission of drive power from an engine to a transmission through a clutch apparatus used hitherto in an automobile, rattling meshing noise is generated from the gears of the transmission due to non-uniform rotation of the engine especially when the engine is idling, that is, when the gears of the transmission are placed in a no-loaded condition.
Such a phenomenon is attributable to the fact that a variation of transmitted torque is directly transmitted to the transmission because the idling torque at the time of generation of such rattling meshing noise in the transmission is very small and the torsion spring acts as a rigid body.
Also, because of the provision of the backlash between the gears of the transmission, the gears collide against each other to act as a source of such rattling meshing noise. To deal with such a problem, a transmission type has been proposed in which an auxiliary gear is additionally associated with each of the gears to provide a backlash-less mechanism. However, the proposed transmission type is not commonly presently employed due to the complex structure and expensiveness of the apparatus. It is thus the present status that any countermeasure has not yet been taken since rattling meshing noise as described above is not heard during driving because of the loud background noise.


DISCLOSURE OF INVENTION

The present invention provides a clutch disc structure in which the surface pressure at the sliding surfaces of a hub plate of a hub splined to an output shaft, connected to a transmission, and a disc plate is reduced so as to prevent generation of noise during idling, and a bush is press-fitted between the disc plate and the hub so as to prevent intrusion of dust into the sliding surfaces, thereby preventing generation of noise.
Also, the present invention provides a clutch disc structure in which the surface pressure at the sliding surfaces of a hub plate of a hub splined to an output shaft, connected to a transmission, and a disc plate is reduced so as to prevent generation of noise during idling. A bush is press-fitted between the sliding surfaces of the disc plate and the hub to be located on at least one side of such surfaces so as to prevent intrusion of dust into the sliding surfaces, and the hub, the bush, and a friction member interposed between the hub plate and a friction plate are plated with satisfactory wear-resistive coatings thereby preventing generation of noise from the individual members.
Also, the present invention provides a clutch apparatus in which, in order to prevent generation of noise during idling and in order that a torsion spring and a sub-torsion spring may not abut and interfere with a friction plate held between the disc plate and the hub plate, spring-retaining lugs are formed integrally with the spring holding portions of the hub plate, thereby preventing generation of noise.


BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a longitudinal sectional view of the clutch disc according to the present invention,
FIG. 2 is a partly cut-away, cross-sectional view illustrating principal parts of the clutch disc according to the present invention,
FIG. 3 is a sectional view of a part of the bush shown in FIG. 1,
FIG. 4(a) is a front elevation view of the hub plate shown in FIG. 1, and
FIG. 4(b) is a sectional view taken along the line Z--Z in FIG. 4(a).


BEST MODE FOR CARRYING OUT THE INVENTION

A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.
FIG. 1 to FIG. 4 show the structure of the clutch disc according to the present invention. Referring to the figures, 1 designates friction discs; 2 designates disc plates fixed to the friction discs 1; 3 designates a hub splined to an output shaft connected to a transmission (not shown); 4 designates a hub pl

REFERENCES:
patent: 3138039 (1964-06-01), Zeidler et al.
patent: 4471863 (1984-09-01), Lech, Jr.

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