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Electric water pump

  • US 8,562,314 B2
  • Filed: 07/30/2010
  • Issued: 10/22/2013
  • Est. Priority Date: 11/19/2009
  • Status: Active Grant
First Claim
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1. An electric water pump apparatus comprising:

  • a body having a hollow cylindrical shape, one end of which opens and the other end of which includes a front surface;

    a stator having a hollow cylindrical shape and disposed in the body to generate a magnetic field according to a control signal;

    a rotor enclosed in the stator and rotated by the magnetic field generated at the stator, wherein the rotor has a hollow cylindrical shape;

    a pump cover having an inlet through which coolant flows in and an outlet through which pressurized coolant flows out;

    wherein the front surface of the body and the pump cover form a volute chamber therebetween,wherein a stator chamber is formed at an outer portion in the body in a radial direction and the stator is mounted in the stator chamber, andwherein a rotor chamber is formed at an inner portion in the body and the rotor is mounted in the rotor chamber;

    a shaft rotatably coupled to the front surface and fixed into the rotor so as to rotate together with the rotor about a central axis of the shaft, and mounted in the rotor chamber; and

    an impeller fixed to a front portion of the shaft in the volute chamber so as to rotate together with the shaft, pressurizing the coolant having flowed in through the inlet,wherein the shaft includes a first shaft connecting the impeller and a front end portion of the rotor and a second shaft connected to a rear end portion of the rotor along the central axis of the shaft, the first shaft being divided and separated from the second shaft by a space that is fluidly closed and sealed from the coolant.

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