WRAP SPRING BRAKE ON OUTPUT VEHICLE TRANSMISSION SHAFT
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United States of America Patent
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Issued Date -
Feb 18, 2010
app pub date -
Oct 15, 2007
filing date -
Oct 13, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A wrap spring moves from a relaxed state to an energised state for braking rotation of the output shaft in a vehicle transmission. The wrap spring may constrict for engagement on the shaft or expand for engagement with an adjacent ground member. Two wrap springs, concentric or axially spaced, provide bi-directional braking. A split ring energises both wrap springs, e.g. using an epicyclic differential arrangement to move opposing ring portions in opposite directions The wrap spring may be mounted in a relaxed state for rotation with the shaft, with a mechanism for inducing drag torque to energise the spring for a braking operation. Means is provided preventing an actuator from energising the wrap spring, e.g. if the shaft is rotating above a predetermined speed.
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