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Electromagnetically released spring applied friction brake with torque booster

  • US 4,280,073 A
  • Filed: 03/01/1979
  • Issued: 07/21/1981
  • Est. Priority Date: 03/01/1979
  • Status: Expired due to Term
First Claim
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1. A friction braking arrangement comprising:

  • at least one rotatable member to be braked;

    a stationary ferromagnetic housing mounted adjacent to said at least one rotatable member;

    a ferromagnetic armature interposed said rotatable member and said stationary ferromagnetic housing and means mounting said armature to said housing for relative axial movement while restraining said armature against free relative rotation;

    spring operator means interposed said armature and said ferromagnetic housing for generating a force acting on said armature tending to urge said armature axially away from said housing;

    friction engagement means for creating a frictional breaking force on said at least one rotatable member by the urging of said armature away from said stationary housing;

    electromagnetic means mounted in said ferromagnetic housing and acting when energized, for urging said armature axially towards said ferromagnetic housing with a force nullifying said spring operator force; and

    torque booster means comprising non self-energizing camming means reacting to the torque reaction generated by said friction engagement means to increase the axial engagement force only when said spring operator force is exerted on said armature, whereby the increased axial engagement force increases the torque capacity of said brake arrangement, said camming means comprising conical ballrecess engagement means interposed said at least one of said rotatable member and at least another of said rotatable members.

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