| 摘要 |
In a hydrodynamic torque converter a pump wheel, a turbine wheel and a guide wheel are enclosed within a converter housing. These three wheels interact in a fluid cycle and are rotatable relative to one another. A controllable bridging clutch is located between the pump wheel and the turbine wheel and is disposed parallel to the torque transmission path between the two wheels. The clutch couples the turbine wheel to the pump wheel without any slippage and in dependence on the pressure of the hydraulic fluid in the converter housing. In the path of the bridging clutch, springs of a torsional vibration damper are arranged for dampening irregularities in the torque transmission on both the driving side and the driven side. A friction damper is connected in parallel with the torsional vibrational damper. When the bridging clutch is closed, the friction damper dampens the vibrational amplitude of the torsional vibration damper and consequently the vibrational amplitude of the turbine wheel relative to the converter housing. When the bridging clutch is open, the friction damper fixes the parts of the torsional vibration damper which are movable with respect to one another so that noise generation in the torque converter is reduced when the bridging clutch is open or disengaged as well as when it is closed or engaged.
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