Patent ID: 7377745

Claim:
A water pump assembly, comprising: an impeller; an impeller shaft around which the impeller rotates; a first bearing portion that supports one end of the impeller shaft; a second bearing portion that supports the other end of the impeller shaft; a housing portion having a central axis along which the impeller is inserted; an upper housing having a flange including attachment holes provided at equal intervals in a circumferential direction, which are used to attach the upper housing to the housing portion, and a discharge port from which coolant is discharged; a water pump that is used for circulating coolant in a vehicle using a motor as a power source; a first plurality of bolts for attaching the upper housing to the housing portion; and a second plurality of bolts for attaching the upper housing to the water pump, wherein a distance between the central axis and the second plurality of bolts is greater than a distance between the central axis and the first plurality of bolts, as well as, a distance between the central axis and an end of the flange.