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Electric rear wheel steering actuator

  • US 5,086,861 A
  • Filed: 04/06/1990
  • Issued: 02/11/1992
  • Est. Priority Date: 04/06/1990
  • Status: Expired due to Fees
First Claim
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1. An electrically powered actuator for moving an object along a linear path comprising:

  • a generally tubular housing;

    an electric motor enclosed in said housing and having a rotatable output shaft, said output shaft having first and second ends;

    a first planetary gear set enclosed in said housing and having an input attached to said first end of said output shaft and an output;

    a first ball screw assembly enclosed in said housing and having a rotatable nut attached to said first planetary gear set output and a screw driven along a linear path of movement by said nut and adapted to be attached to an object to be moved, said output shaft, said first planetary gear set and said first ball screw assembly sharing a common longitudinal axis with said housing;

    a second planetary gear set enclosed in said housing and having an input attached to said second end of said output shaft and an output;

    a second ball screw assembly enclosed in said housing and having a rotatable nut attached to said second planetary gear set output and a screw driven along a linear path of movement by said nut and adapted to be attached to an object to be moved, said output shaft, said second planetary gear set and said second ball screw assembly sharing a common longitudinal axis with said housing; and

    brake means attached to said output shaft whereby when said electric motor is actuated, said output shaft rotates said planetary gear sets and said nuts to move said screws along said path of movement and when said first ball screw assembly screw reaches a predetermined position along said path, said brake means is actuated to stop the rotation of said output shaft.

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