| 摘要 |
A selectively engageable friction clutch is disposed in parallel drive relation with a torque converter. The friction clutch has a viscous drive portion which, during clutch engagement, permits relative rotation between the clutch input and output members so that the engine torsional vibrations are effectively dampened. The viscous drive portion has a plurality of hollow cylindrical hubs disposed in interdigital relation on respective input and output members. The cylindrical hubs on one of the input or output members has helical grooves formed on the cylindrical surfaces thereof so that the viscous fluid, preferably a silicone fluid, is pressurized between adjacent cylindrical surfaces to increase the efficiency of the viscous drive portion.
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