Patent ID: 6960066
Filing Date: 2005-11-01
Classification: F04D,F05D

Abstract:
1. A water pump comprising: a rotation member, a hollow shaft portion having an opening on one end and connected to the rotation member for unitarily rotating with the rotation member; an impeller connected to the shaft portion for unitarily rotating with the shaft portion; a body defining a fluid chamber in which the impeller is rotated; a bearing rotatably supporting the shaft portion on the body; a sealing member provided between the shaft portion and the body for sealing the fluid chamber; a cylindrical space defined between an external peripheral surface of the shaft portion and an internal peripheral surface of a cylindrical portion of the body, the sealing member being intermediately located in the cylindrical portion and dividing the cylindrical space into an impeller side portion and a bearing side portion, a drain opening provided at an end of the cylindrical space for discharging water leaked from the impeller side portion to the bearing side portion via the sealing member to an atmosphere; a through-bore provided either on the rotation member or the shaft portion for establishing a communication between the drain opening and the atmosphere; and a cover portion covering the opening of the shaft portion and the through-bore.