| 摘要 |
A bypass assembly (27) is disclosed for use in a torque converter (15) of an automatic transmission. The assembly includes a fluid coupling (29) and a driveplate assembly (31) which cooperate with the torque converter and its housing (22) to define a release pressure chamber (R), a first apply chamber (A1), and a second apply chamber (A2). At relatively low vehicle speeds, and relatively high levels of driveline vibration, the assembly operates in a release mode. At medium vehicle speeds, and medium levels of vibration, the pressures in the apply chambers (A1) and (A2) are approximately the same, and only the fluid coupling (29) is in operable engagement. At relatively higher vehicle speeds, and at relatively lower levels of vibration, the pressure in the apply chamber (A1) increases, moving a valve member (115) in opposition to a spring (123) to an open position, draining pressure from the second apply chamber (A2) to the release chamber (R). Pressure in the first apply chamber (A1) biases both the driveplate assembly ( 31) and the fluid coupling (29) into frictional engagement with the torque converter housing (22), such that torque is transmitted through the driveplate assembly, which acts as a O-slip device, while the fluid coupling (29) dampens oscillations and torsional vibrations through the driveplate.
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