| 摘要 |
A viscous fluid clutch including relatively rotatable first and second drive members having a fluid shear space therebetween and which are cooperable with a fluid medium in the shear space to provide a shear-type fluid drive therebetween, an annular reservoir for at times storing the fluid medium, speed-responsive valve means for permitting the flow of the fluid medium from the annular reservoir to the fluid shear space at an intermediate range of engine speeds and for preventing flow therebetween at all lower and higher engine speeds.
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