Water pump of internal combustion engine with a slinger sealing the bearing

摘要

A water pump of an internal combustion engine, including a pump housing having a cylindrical portion constructed so as to surround an outer peripheral side of a drive shaft, the cylindrical portion being integrally formed of an aluminum-based metal material, and a stepped portion provided on the outer peripheral side of the cylindrical portion. A bearing is provided having an outer race fixed to a pulley and an inner race made of an iron-based metal material and fixed to an outer periphery of the cylindrical portion. Additionally, a shielding member is provided having an inner peripheral side sandwiched between the inner race and the stepped portion, an outer peripheral side having a plate shape and extending to side of the outer race, and an end-face seal structure portion formed of an elastic material and formed on at least one of opposite surfaces of the sandwiched inner peripheral side.

主权项

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
the shielding member includes an inner peripheral surface seal structure portion made of an elastic material, configured so as to be in elastic contact with an outer peripheral surface of the cylindrical portion, and provided on an inner peripheral side of the shielding member.