VENTILSYSTEM FUER EINE HYDRAULISCH GESTEUERTE ANFAHR-REIBUNGSKUPPLUNG, INSBESONDERE FUER KRAFTFAHRZEUGE

摘要

A valve system for a hydraulically controlled starting friction clutch for motor vehicles, a clutch pressure control valve that controls the clutch pressure as a function of the torque demand of the driver, a valve arrangement that modulates a pressure dependent upon the engine speed and that delivers it to the clutch pressure control valve, a shuttle valve 11, a throttle orifice 12 and an accumulator 13 associated with the clutch pressure control valve 1. The shuttle valve 11 comprises a valve member 15 disposed in a valve bore 14 with three control lands 16, 17 and 18 and a spring 19 that acts upon one end of the valve member 15. A pressure signal Ppitot dependent upon the speed is applied by way of lines 21 and 22 between the first control land 16 and the second control land 17 and between the second control land 17 and the third control land 18 and is supplied by way of outlets 23 and 24 and a line 10 to the clutch pressure control valve 1. A pressure signal Ptv dependent upon the torque acts by way of lines 26 and 27 upon both ends of the valve member 15, one line 27 having a throttle orifice 12 that reduces the pressure acting upon one end of the accumulator 13, the latter comprising a piston 29 in a valve bore 28 that is acted upon by a spring 30.