Fluidsteuervorrichtung und ein diese umfassender Servolenkungskreis.

摘要

The invention relates, in particular, to a flow control device for diverting a specified quantity of fluid, under high pressure, from the supply circuit of a hydraulic motor, comprising a body (48), a bore (50) in the body, a flow-control slide valve (52) which can move axially in the bore under the action of a control member (98), an inlet orifice (58) and an outlet aperture (60) for the fluid, opening into the bore (50). …According to the invention, the slide valve (52) has first and second bearing surfaces (82, 84) substantially at the diameter of the bore and separated by a narrowed section (86) opposite which opens the inlet orifice (58), the second bearing surface (84) controlling the outlet aperture (60). Furthermore, the slide valve (52) determines a first chamber arranged between the first and second bearing surfaces (82, 84), and second and third chambers arranged on either side of the slide valve (52) and communicating with them. Lastly, the outlet aperture (60) communicates with an intermediate chamber (70), into the lateral wall of which opens the outlet orifice (62) of the flow control device and which contains a regulating slide valve (72) controlling the outlet orifice (62) and moving counter to a spring (78) under the effect of the difference in the pressure prevailing in the first chamber and that prevailing in the intermediate chamber. …Application to adaptive power steering of motor vehicles. ……