| 摘要 |
Magnetic flux produced by an electrically energized coil threads radially between a housing and a flange on a rotatable shaft, threads axially between the flange and a control collar for the clutch, threads radially between the control collar and an input hub via a helical spring contracted around the hub, and threads axially between a flange on the hub and the housing to complete the flux circuit. Flux cutting axially between the flange on the shaft and the control collar causes the control collar to shift axially into engagement with the flange so as to effect turning of the collar relative to the input hub and contraction of the spring around an output hub.
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