Patent ID: 6896486

Claim:
A water pump comprising: a pump body; a pump shaft rotatably supported by said pump body in a piercing arrangement, said pump shaft having a first end to which an impeller is attached, and having a second end opposite said first end; a mechanical seal elastically arranged via an urging member between said pump body and said first end of said pump shaft; and an engage mechanism between said pump body and said second end of said pump shaft, and arranged to engage said pump shaft to said pump body against an urging force of said urging member, said engage mechanism including: an annular member rotatably fitted to said pump shaft so as to contact said pump body, said annular member having an annular flange at a circumferential portion thereof; and a cylindrical engage pin piercing said pump shaft in the diameter direction while sandwiching said annular member with said pump body, said engage pin being arranged with respect to said annular member so that said annular flange faces an end face of said engage pin.