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Electric actuator

  • US 10,451,154 B2
  • Filed: 06/07/2016
  • Issued: 10/22/2019
  • Est. Priority Date: 06/18/2015
  • Status: Active Grant
First Claim
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1. An electric actuator comprising:

  • an electric motor that converts an electric power into a rotational output and outputs the rotational output through a gear of the electric motor;

    a housing, in which the electric motor is fixed;

    a speed reducing gear device of a parallel shaft type that reduces a rotational speed of the rotational output generated by the electric motor;

    an output shaft that is driven by the rotational output, the rotational speed of which is reduced by the speed reducing gear device;

    a cover that is assembled to the housing and forms a space between the cover and the housing to receive the electric motor and the speed reducing gear device; and

    a housing-side bearing that is placed between the housing and the output shaft and rotatably supports the output shaft relative to the housing; and

    a cover-side bearing that is placed between the cover and the output shaft and rotatably supports the output shaft relative to the cover, wherein;

    the speed reducing gear device includes a plurality of intermediate shafts that are parallel to the output shaft and are placed between the gear of the electric motor and the output shaft along a transmission path, through which the rotational output of the electric motor is transmitted to the output shaft;

    one end portion of each of the plurality of intermediate shafts is fixed to the housing, and another end portion of each of the plurality of intermediate shafts is fitted into a corresponding one of a plurality of recesses formed at the cover;

    the cover is positioned relative to the housing by fitting the another end portions of the plurality of intermediate shafts into the plurality of recesses, respectively;

    the cover is positioned relative to the housing through use of two of the plurality of recesses, into which two of the plurality of intermediate shafts are respectively fitted;

    one of the two of the plurality of recesses is a circular hole while another of the two of the plurality of recesses is an elongated hole;

    a longitudinal direction of the elongated hole is along a straight line, which is perpendicular to the two of the plurality of intermediate shafts and extends through the two of the plurality of intermediate shafts; and

    a length of the elongated hole, which is measured in the longitudinal direction of the elongated hole, is larger than a width of the elongated hole, which is measured in a direction perpendicular to the longitudinal direction.

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