Rotational control apparatus
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United States of America Patent
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Sep 7, 2004
Grant Date -
Aug 7, 2003
app pub date -
Feb 4, 2002
filing date -
Feb 4, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A rotational control apparatus (10) includes multiple facings (274-276) rotatable with and axially slideable relative to a mount (124) and which sandwich multiple friction plates (252, 253) rotatable with and axially slideable relative to a hub (12). To create turbulent air flow, the friction plates (252, 253) include an undulating outer circumferential edge (258) and a plurality of passages (260) in the interface portion and overlapping the inner peripheries (282) of the facings (274-276). An automotive clutch release type bearing (290) directly abuts between a piston (40) and the friction facing (274) and is encapsulated in the piston cavity (36) and a cavity (277) formed in the friction facing (274), with the friction facing (274) engaging the axial end (34) of the air chamber (24) when the facings (274-276) and the friction plates (252, 253) are disengaged. In the preferred form, the air chamber (24) and the mount (124) are of the same geometry and are machined from identical castings.
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