Patent ID: 9441675
Filing Date: 2016-09-13
CPC Classification: F01P,F04D,F05D,F16C

Claim Text:
1. A water pump of an internal combustion engine, comprising: a driving device including a pulley rotating by transmission of power from a driving source, a drive shaft rotating together with the pulley, and an impeller provided on the drive shaft to rotate together with the drive shaft; a pump housing including a pump chamber structure portion defining at least a part of a pump chamber in which the impeller is disposed, a cylindrical portion constructed so as to surround an outer peripheral side of the drive shaft, the pump chamber structure portion and the cylindrical portion being integrally formed of an aluminum-based metal material, and the cylindrical portion having portions with different outer diameter including a first diameter portion and a second diameter portion having an outer diameter that is larger than an outer diameter of the first diameter portion so as to form a stepped portion provided on an outer peripheral side of the cylindrical portion; a bearing including an outer race fixed to the pulley, an inner race made of an iron-based metal material and fixed to an outer periphery of the first diameter portion, and a rolling body interposed between the inner race and the outer race; and a shielding member having an inner peripheral portion sandwiched and fixed between the inner race and the stepped portion, an outer peripheral portion having a plate shape and extending to a side of the outer race, and an end-face seal structure portion formed of an elastic material and formed on one of the opposite surfaces of the sandwiched inner peripheral portion which is on a side of the stepped portion; and the shielding member comprising an annular projection that extends along the outer peripheral surface of the second diameter portion, the annular projection preventing water from entering into a gap formed in a radial direction between the annular projection and the outer peripheral surface of second diameter portion, wherein