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Electric actuator and motor used therein

  • US 7,339,299 B2
  • Filed: 04/25/2006
  • Issued: 03/04/2008
  • Est. Priority Date: 04/26/2005
  • Status: Expired due to Fees
First Claim
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1. An electric actuator comprising:

  • a motor comprising a rotor and a stator, the stator comprising a permanent magnet;

    a motor casing surrounding the motor, the stator being in the motor casing such that the permanent magnet is fixed on an inner circumferential surface of the motor casing, the motor casing having a closed end and an open end having an outward flange with an inner corner;

    a shaft operable to be driven by the motor and extending from the open end of the motor casing, said shaft having a worm wheel as an extended part, said shaft having a first end close to the closed end of the motor casing, and a second end opposite to the first end;

    at most two ball bearings positioned and configured radially with respect to the shaft to rotatably support the shaft, the at most two ball bearings comprising a first ball bearing at a middle of the shaft, and a second ball bearing at the second end of the shaft;

    a gear casing including the worm wheel of the shaft, said gear casing comprising;

    an end face that faces the open end of the motor casing,an annular projection being axially formed on the end face of the gear casing and having an outer circumferential surface, anda vertical seat face extending from the annular projection outwards; and

    an elastic O-ring positioned in a space formed by the seat face of the gear casing and the outer circumferential surface of the annular projection and the inner corner of the outward flange of the motor casing.

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