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Water pump motor, and water pump using same

  • US 9,318,931 B2
  • Filed: 02/13/2012
  • Issued: 04/19/2016
  • Est. Priority Date: 08/17/2009
  • Status: Active Grant
First Claim
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1. A water pump motor comprising:

  • a lower case on top of which a cylindrical protrusion is provided;

    a stator whose lower portion is supported on top of the cylindrical protrusion and is sealed by the lower case;

    a stator case formed of an inner circumferential portion, an outer circumferential portion and an upper surface between upper end portions of the inner and outer circumferential portions, wherein a lower portion which extends from the inner circumferential portion of the stator case is sealed by a circular sealing plate, and a groove is formed at a center of the circular sealing plate, wherein the stator case is monolithically formed as a single piece having the inner circumferential portion, the outer circumferential portion, the upper surface and the circular sealing plate, which together form an annular trench accommodating the stator, and wherein a lower distal end portion of the outer circumferential portion is disposed below a bottom surface of the groove so as to abut against an upper surface of the lower case, and wherein the outer circumferential portion abuts and surrounds an outer circumferential surface of the cylindrical protrusion, thereby coupling the lower case and the stator case to each other;

    a rotational shaft whose lower portion is rotatably supported by the groove;

    a rotor that is placed at an upper-inner circumferential portion of the stator case and having its center coupled to the rotational shaft to thus rotate according to an action with respect to the stator; and

    an upper case having an inverted cup shape and coupled directly with the lower case in such a way that an inner circumferential surface of the upper case is fitted circumferentially around an outer circumferential surface of the outer circumferential portion of the stator case, wherein an O-ring is disposed between the upper surface of the stator case and an inner surface of the upper case,a middle case having a circular plate shape and disposed on top of the upper-inner circumferential portion of the stator case and inside the upper case to fluidically seal the rotor in a sealing state, wherein an upper portion of the rotational shaft is rotatably supported at a center of the middle case,wherein an upper bearing is installed at the center of the middle case to thereby rotatably support the rotational shaft.

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