192 clutches and power-stop control – Latch operated – Transversely moving transmission member
Patent
1993-08-05
1994-08-09
Braun, Leslie A.
192 clutches and power-stop control
Latch operated
Transversely moving transmission member
192 33C, 192 81C, 192 84T, 335251, F16D 2710
Patent
active
053357604
ABSTRACT:
A solenoid for controlling the engagement and disengagement of a wrap spring clutch includes an electromagnetic coil having a core member disposed adjacent one axial end thereof. An armature is provided within the electromagnetic coil for selective axial movement in response to the energization and deenergization of the electromagnetic coil. The armature is connected to an actuator for the wrap spring clutch such that movement of the armature controls the engagement and disengagement thereof. The core member and the armature are both formed from relatively soft, magnetically permeable materials. A flux breaker is disposed within the electromagnetic coil between one axial end of the armature and the core member. The flux breaker is formed from a relatively hard, non-magnetically permeable material, such as stainless steel. The flux breaker prevents the armature from contacting the core member when attracted thereto by energization of the electromagnetic coil. The flux breaker is provided for minimizing the adverse effects of residual magnetism on the operation of a solenoid. By forming the flux breaker from a material which is harder than the materials used to form the core member and the armature, the useful life of the flux breaker is extended beyond that of prior art flux breakers.
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"Wrap Spring Clutches And Brakes", Warner Electric Division, Dana Corporation, Apr. 1990.
Braun Leslie A.
Dana Corporation
Pitts Andrea
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