Patent ID: 8562314
Filing Date: 2013-10-22
Classification: F04D

Abstract:
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; 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.