| 摘要 |
PURPOSE: To prevent a risk of occurrence of cavitation or loss in output power. CONSTITUTION: In a device, in particular, for driving a water pump in order to circulate cooling water through an internal combustion engine, the water pump is composed of a drive shaft 7, a drive wheel 12, and a water pump impeller 2 adapted to rotate in a water pump casing 1 in which the water pump impeller is driven through a fluid friction coupling 3. |
