| 摘要 |
PURPOSE: A viscous coupling is provided to allow the coupling to be locked during reversing of vehicle. CONSTITUTION: A viscous coupling having two portions(11,12), a hub and a housing, comprises a freely traveling structure having locking operation in both directions of relative rotation of ring portions(24,26) at a rotating acceleration, when a torque flows to a first direction at a positive speed difference between two portions, the first and second portions, and having unlocking operation in both directions of the rotation of ring portions when a torque flows to a second direction at a negative speed difference between two portions, the first and second portions, the freely traveling structure being made effective between one of the portions, relatively rotatable, and a plate support(22) for supporting at least one portion of a coupling plate(20) on the specified one of the relatively rotatable portions.
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