| 摘要 |
<p>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.</p> |
