| 摘要 |
A water pump (1) for a vehicle includes a power transmitting member (2), a driven shaft (5) rotated independently from the power transmitting member (2), an impeller. (7), a biasing member (3) for pressing an inner circumferential surface (2a) of the power transmitting member (2) and for rotating in order to transmit a rotation of the power transmitting member (2) to the driven shaft (5) when the biasing member (3) contacts the inner circumferential surface (2a), and a control member (4) for allowing the power transmitting member (2) and the biasing member (3) to come in contact with each other or to come out of contact from each other and for controlling a contacting state between the power transmitting member (2) and the biasing member (3), |
