Patent ID: 9618011
Date: 2017-04-11
CPC Classifications: F04D

Claim:
1. An electric water pump comprising: an electric motor having a stator which generates an electromagnetic field by control signals supplied from a pump driver, and a rotor which rotates by the electromagnetic field generated by the stator; an impeller connected to and rotating with the rotor to circulate a coolant, wherein an inside space of the electric water pump includes: a bulkhead separating the motor room and the pump driver room such that the motor room and the pump driver room are sealed with each other by the bulkhead; a separation wall separately forming a rotor room in the motor room to isolate the rotor from the stator in the motor room; a cap mounted at a front surface of the bulkhead to support one end of the separation wall, wherein the cap is separately formed from the bulkhead and fitted to the bulkhead; a cap room formed in the bulkhead such that the cap room is closed and sealed with respect to the motor room by the cap, wherein the cap room is formed at a side of the cap facing the pump driver room; a first passage formed in one side of a water pump housing or a motor room cover for sealing the motor room from outside; a second cooling passage of which one end is connected to the first cooling passage, the second cooling passage penetrating the bulkhead and the cap room; and a third cooling passage connected to another end of the second cooling passage and formed in another side of the water pump housing or the motor room cover, wherein a portion of the coolant passing through the volute room flows through the first cooling passage, one part of the second cooling passage, the cap room, another part of the second cooling passage, and the third cooling passage, wherein the first, second, and third cooling passages are integrally formed by the water pump housing, the bulkhead, and the motor room cover.