| 摘要 |
A bypass driveline (27) for a torque converter-type automatic transmission (11) in which the bypass driveline includes a viscous coupling (30). The viscous coupling includes an annular body member (32) formed of aluminum, an annular cover member (34) of steel secured at its outer periphery (34a) to the outer peripheral portion (32a) of the body member and radially inwardly thereof spaced axially from the body member to define a viscous fluid chamber therebetween, and an annular clutch member (36a) disposed in the chamber and having a central hub portion (36e) adapted to be drivingly connected to an output shaft (16) of the torque converter. Confronting portions (32e, 32f) and (36c, 36d) of the body and clutch members define closely spaced working means for viscously transmitting force from the body member to the clutch member. Drive into the coupling from the housing (22) of the torque converter is through an annular steel clutching surface (34f) defined on the side face of the radially outer peripheral portion of the cover member. The body member includes an axially extending hub portion (32d) journaled on the central hub portion of the clutch member. A radially inner portion (34d) of the cover member includes an axially extending lip portion (34f) disposed radially inward of the central hub portion. First (54) and second (56) dynamic seals disposed on radially opposite sides of the central hub portion cooperate with the central hub portion and respectively with the body and cover member to seal the chamber. A thrust assembly (42) including thrust washers 44, 48 on the exterior of the coupling react axial forces at a position radially outward of the journal to inhibit cocking of the body hub on the clutch hub. |
