192 clutches and power-stop control – Elements – Engaging surfaces
Patent
1989-02-24
1990-08-28
Braun, Leslie A.
192 clutches and power-stop control
Elements
Engaging surfaces
192 53F, F16D 1374
Patent
active
049517988
ABSTRACT:
An automotive transmission lubricated friction clutch is provided having a synchronization ring and matching cone; these parts form a friction pairing. Materials having different friction characteristics and friction wear resistances are used for the friction surfaces forming the friction pairing. A specific friction material is provided having desirable friction characteristics but lacking pores or drainage thread for one friction surface, and a microporous sintered material having a friction-effective area A of 50% <A <90% of the total friction surface and pores with a mean diameter of <300 .mu.m for the other friction surface. Either the synchronization ring or the matching cone are designed to represent one or the other form of friction surface, as desired. Lubricated friction clutches for automotive transmissions can be manufactured according to the invention that have increased life expectancy, shorter shifting times, smaller sizes and reduced manufacturing costs as compared to other clutches.
REFERENCES:
patent: 2299877 (1942-10-01), Calkins
patent: 2319740 (1943-05-01), Lapsley et al.
patent: 3578122 (1971-05-01), Magnier
patent: 4618049 (1986-10-01), Pflaum et al.
patent: 4770283 (1988-09-01), Mutz et al.
M. Drozda: "Eigenschaften Und Anwendung von Sinterreibwerkstoffen", Antriebstechnik 22 (1983), No. 6, pp. 35-37.
Braun Leslie A.
Sinterstahl Gesellschaft m.b.H.
Whitelaw Nicholas
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