Patent ID: 9587647
Date: 2017-03-07
CPC Classifications: F01P,F04D,H02K

Claim:
1. An electronic water pump for vehicles, having a pump casing through which cooling water passes, an outer motor casing coupled to a lower end of the pump casing, with a stator installed in the outer motor casing, and a motor cover coupled to a lower end of the outer motor casing, with a control board installed in the motor cover, the control board controlling the stator, the electronic water pump comprising: an inner motor casing provided in the outer motor casing, with a shaft installed upright in a center of an insert hole formed in an upper surface of the inner motor casing, and a ring-shaped stator fitted over a circumferential outer surface of a lower end of the inner motor casing, the inner motor casing having a depression formed in the upper surface thereof, and at least one through hole formed vertically through the inner motor casing in an outer portion of the depression; a rotor disposed in the insert hole so as to be rotatable around the shaft, with a permanent magnet provided in the rotor; and a cooling unit comprising an upper cooling plate fitted over a circumferential outer surface of the rotor, the upper cooling plate being seated into the depression, at least one cooling pin coupled to an outer portion of the upper cooling plate, the at least one cooling pin being inserted into the at least one through hole and disposed in the outer motor casing, and a lower cooling plate coupled to a lower end of the cooling pin.