| 摘要 |
A fluid coupling device is disclosed of the type including a rotatable coupling assembly (73) including a housing member (75) and a cover member (77) which define a fluid chamber therebetween. A coupling member (71) is disposed in the fluid chamber and its forward surface and adjacent surface of the cover member (77) define a viscous shear space. The cover member (77) includes a plurality of cooling fins (85) disposed on the forward surface of the cover member. The coupling assembly (73) defines a maximum predetermined radius R. The cover member (77) and housing member (75) are joined at an annular outer urface (93) and an annular inner surface (97), these surfaces being disposed rearwardly of the shear space. The cover member (77) defines an annular inner surface (101) which is the outer periphery of the fluid chamber. The coupling member (71) includes an annular inner surface having a radius in the range of about 0.87 R to about 0.93 R to increase substantially the radius of the viscous shear space and the radius of efficient cooling fins, in relationship to the radius R of the coupling device.
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