Wrap spring torque transfer device and method for improving service life of such device
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United States of America Patent
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N/A
Issued Date -
Nov 1, 2007
app pub date -
May 1, 2006
filing date -
May 1, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A wrap spring torque transfer device including a housing, a shaft rotatably positioned at the housing, a hub rotatably positioned at the housing, a wrap spring disposed about the hub and the shaft; and capable of selectively facilitating or defeating torque transfer between the hub and the sleeve, a coil in magnetic flux communication with the housing, shaft and hub, such that the magnetic flux passes the hub and sleeve to draw the hub and sleeve together. A method for improving service life of a wrap spring torque transfer device including passing a magnetic flux radially between a housing and a flange mounted to a shaft, passing the flux axially between the flange and a collar, passing the flux radially between the collar and a sleeve at the shaft, substantially avoiding flux passage directly between the collar and the housing.
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