| 摘要 |
A differential rotation limiting means (35) operable to limit rotation of an output guar (23) relative to a gear case (11 ), and actuation means (55) for actuating the rotation limiting means, from an unactuated to an actuated condition. The rotation limiting means includes a member (47), toward one axial end of the gear case and moveable between a first position, the unactuated condition of said rotation limiting means, and a second position, the actuated condition. A sensor assembly (47,71,73) is adjacent the one axial end of the gear case and includes a sensor element (71 ) and a wall-like member (63,73) between the rotation limiting means (35) and the actuation means. The wall-like member (63,73) includes a non- ferromagnetic portion (73) between the sensor element (71) and the moveable member (47). Movement between the first and second positions results in a corresponding change in the electromagnetic flux (F) coupling the sensor element (71) and the moveable member (47).
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