| 摘要 |
The fluid friction coupling, which is suitable especially for a fan of an internal combustion engine, comprises a buffer chamber (39) which receives a part of the entire quantity of shear fluid contained in the coupling, through an inlet opening (43) placed beneath the shear fluid level (47), when the coupling is not in rotation. The received partial quantity lowers the liquid level in the shear gaps (23). In cold starting therefore the coupling transmits a reduced torque, which by reason of the consequently increased slip increases the pump effect of a pump device (37) and reduces the fan noise. The quantity of shear fluid contained in the buffer chamber (39) is delivered again to the shear fluid cycle of the coupling with time retardation through a constricted opening (45) when the coupling is in operation. |
