Device for actuating a frictional converter lock-up clutch of a hydrodynamic torque converter

摘要

A device for actuating a frictional converter lock-up clutch of a hydrodynamic torque converter. A piston of the lock-up clutch can be acted upon by pressure of a inner chamber of a converter that acts in the engaging direction of the lock-up clutch and by pressure of a piston chamber delimited by the piston that acts in the disengaging direction. At least in the disengaging operating condition of the lock-up clutch, the piston space is connected to the inner chamber of the converter. The inner chamber can be supplied with hydraulic fluid via a first line. Hydraulic fluid can be discharged from the inner chamber via a second line. The piston chamber of the lock-up clutch can be connected to a pressurized zone and to an essentially unpressurized zone. By varying the pressure in the piston chamber, the device can modulate the transmission capacity of the lock-up clutch.

主权项

1. A device (1) for actuating a frictional converter lock-up clutch (2) of a hydrodynamic torque converter (3),
wherein a piston (7) of the converter lock-up clutch (2) is acted upon by a first pressure (pWD) of an inner chamber (8) of the converter that acts in an engaging direction of the converter lock-up clutch (2) and by a second pressure (pWK) of a piston chamber (9), delimited by the piston (7), that acts in an disengaging direction, at least when the converter lock-up clutch (2) is in a disengaged operating condition, the piston chamber (9) is connected to the inner chamber (8) of the converter, and the inner chamber (8) of the converter is fed with hydraulic fluid, via a first line (12), and hydraulic fluid is discharged from the inner chamber (8) of the converter, via a second line (13), the piston chamber (9) of the converter lock-up clutch (2) is connectable to a pressurized zone (16) and to an essentially unpressurized zone (17), an apparatus (15) is provided by which a transmission capacity, of the converter lock-up clutch (2), is modulated by varying the second pressure (pWK) in the piston chamber (9), the apparatus (15) comprises a regulating valve device (35) arranged between the pressurized zone (16) and the piston chamber (9) and between the unpressurized zone (17) and the piston chamber (9) such that the piston chamber (9) is brought into functional connection, by way of the regulating valve device (35), with the pressurized zone (16) and with the unpressurized zone (17), and the apparatus (15) comprises a throttle device (38) which connects the piston chamber (9) and the inner chamber (8) of the converter, and a further throttle device (30) is provided between the pressurized zone (16) and the inner chamber (8) of the converter.