| 摘要 |
<p>Disclosed is a fluid friction clutch, wherein the force is transmitted from the driving to the driven member by means of the shear forces of a viscous medium located in gaps between the working surfaces of the driving and the driven sides. The transmittable force may be regulated by means of the degree of filling of the gap with the viscous medium as a function of external parameters. A fluid friction clutch of this type is characterized in that the drive and the driven members are elements of an at least three-member planetary transmission, wherein the individual elements of the planetary transmission engage each other through gaps, which in turn serve to receive the viscous medium, thereby effecting the transmittal of the force. It is possible with this clutch to obtain selected gear ratios between the driving and the driven members, in particular stepping up to higher speeds, even though the force is transmitted by fluid friction only. Fluid friction clutches with differential gear ratios are preferably used for driving fans to move cooling air through the radiator of internal combustion engines for automotive vehicles.</p> |
