192 clutches and power-stop control – Clutches – Operators
Patent
1985-04-01
1987-03-17
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Operators
1921061, 464 68, F16D 314, F16D 366
Patent
active
046500537
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a spring type clutch disc of a friction clutch for an automobile.
BACKGROUND ART
A clutch is provided in automobiles for interrupting transmission of the output of an engine during a shift between gear ratios of a gear transmission, and a friction clutch is most widely employed by virtue of the simple construction and the ease of maintenance. Although the friction clutch is classified into a variety of types, its basic construction is such that a release bearing is urged toward a flywheel by the clutch pedal so that a clutch disc normally pressed against the flywheel by the force of a spring can be urged away from the flywheel against the force of the spring. The clutch disc is classified into a solid type and a spring type. The spring type comprises coil springs interposed between a hub splined to the input shaft of the gear transmission and disc plates holding a friction plate making pressure engagement with the flywheel, so as to transmit torque therethrough, and is, therefore, advantageous in that a shock absorbing action is effected during engagement of the clutch.
By the way, when the engine is in its idling condition, that is, when the gear position in the transmission is neutral, "clattering" or "rattling" noise is frequently generated from the transmission. This is because, in the idling condition, a large torque variation occurs in the engine, which variation is especially marked in the case of a Diesel engine, and the resultant collision of the gears of the transmission with each other gives rise to generation of meshing noise. A structure having a special torsional characteristic is known in which, for the purpose of preventing such meshing noise, a friction washer is interposed between the disc plates and the hub so as to absorb the noise by the clutch disc. FIG. 1 shows an example of the torsional characteristic of the structure having such a function. The noise occurring during idling has concern with a first-stage hysteresis torque indicated by the symbol H.sub.1, and, for the purpose of preventing the noise, it is necessary to maintain this H.sub.1 at a certain small value suitable for the engine/transmission torsional vibration system. To this end, the co-applicant of the present application has proposed the technique of reducing the surface pressure between the disc plates and the hub and providing a plated coating for stabilizing the coefficient of friction of and improving the wear resistance of these frictional portions, in Japanese Utility Model Application No. 56-161633 laid open already as Japanese Utility Model Laid-open No. 58-67124. However, depending on the engine, this hysteresis torque H.sub.1 must be set at a very small value of the order of 0.05-0.12 kgm to avoid trouble. This is because, when the value of this hysteresis torque H.sub.1 becomes smaller than 0.05 kgm in use, the clutch disc itself makes a torsional resonance thereby generating great noise, while, when this value becomes larger than 0.12 kgm, the effect of preventing noise generated from the transmission is abruptly reduced.
DISCLOSURE OF THE INVENTION
The object of the present invention is, therefore, to provide an improved spring type clutch disc in which the first-stage hysteresis torque in the torsional characteristic of the clutch disc can be stably maintained at a very small value over a long period of time, so that the clutch disc can deal with engines of whatever kind.
The present invention which attains the above object provides a spring type clutch disc including a hub having flanges at the middle portion of its outer periphery, disc plates sandwiching the flanges of the hub therebetween, and a slide member interposed between the disc plates and the hub to make sliding contact with the hub, the torque transmission from the disc plates to the hub being effected through coil springs interposed therebetween, characterized in that an electroless plated Ni coating is provided on either one of the slide member and the hub, while an electroless plated Ni-P-B
REFERENCES:
patent: 3867176 (1975-02-01), Dalton et al.
patent: 4239789 (1980-12-01), Blum et al.
patent: 4560054 (1985-12-01), Kayanoki et al.
patent: 4577743 (1986-03-01), Raab et al.
patent: 4585428 (1986-04-01), Asada
Hashimoto Yasuyuki
Kayanoki Katsuhiko
Ono Seigo
Teramachi Kazuo
Bonck Rodney H.
Lorence Richard M.
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
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