| 摘要 |
PCT No. PCT/EP93/01926 Sec. 371 Date Jan. 24, 1995 Sec. 102(e) Date Jan. 24, 1995 PCT Filed Jul. 21, 1993 PCT Pub. No. WO94/02345 PCT Pub. Date Feb. 3, 1994A power assisted steering system, in particular, for motor vehicles, contains a servomotor (2), a servopump (3), a tank (4), a control valve (1) with a controllable feedback device (5), and a control member (46) whose choke cross section can be altered as a function of the vehicle speed. Control valve (1) is made as a four-way valve and has a supply connection (22, 23), a feedback connection (7), and two working connections (8, 10) for the lines (11, 12) that lead to the two working chambers of servomotor (2). Between feedback device (5) and supply connection (22, 23), there is arranged a device (13) for piling up the pressure medium stream and the device is made according to one practical example as a choke (50, 51). With the help of this choke (50, 51), one can achieve a hydraulic centering component in addition to a mechanical centering component.
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