| 摘要 |
A fluid coupling device, especially a viscous fan drive, of the type including an output coupling member defining a fluid operating chamber and an annular inner surface. The device includes an input coupling member rotatably disposed in the operating chamber and cooperating with the output member to define a shear space. The input coupling member defines an annular outer surface including a generally cylindrical surface portion adjacent the forward surface of the input member and closely spaced apart from the inner surface of the output member. The outer surface of the input member also includes a second surface portion which is generally frusto-conical and cooperates with the axis of rotation to define an included angle between about 25 degrees and about 35 degrees. The invention results in a coupling having lower disengaged output speeds as well as reduced disengagement time during cold-start-up, without weakening of the outer periphery of the input member.
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