Self-energizing disc brakes
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United States of America Patent
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May 7, 1991
Grant Date -
N/A
app pub date -
Sep 25, 1989
filing date -
Sep 28, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A compound disc brake comprises a pair of pressure plates with a ball and ramp camming mechanism, one of the plates comprises a driven plate keyed to a rotating axle shaft to be braked, and the other plate comprises an input plate carried from the driven plate by the camming mechanism. The input plate is of larger diameter than the driven plate with its radially outer region comprising a torque-transmitting mechanism which transmits torque applied to that region by primary braking device, which can be a spot brake, to the central region of the input plate. Retardation of the input plate by the primary braking device causes the pressure plates to separate axially and move into engagement with relatively stationary braking surfaces in a brake housing whereafter servo braking occurs. Various multi-plate embodiments are disclosed, including embodiments in which the torque-transmitting mechanism is a separate annular disc keyed to the outer peripheral edge of the servo plate. Other modifications of the pressure plates are also disclosed.
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