Elektromagnetisch betätigtes Ventil, insbesondere für hydraulische Bremsanlagen von Kraftfahrzeugen

摘要

The valve (10) has a seat valve (53) with a hollow cone-shaped valve seat (28) and a closing member (37) in form of a spherical segment on a long bored-out plunger (20). A feed boring (29) connected to a pressure medium inlet (26) opens centrally into the va lve seat (28). A magnetic armature (19) that exerts a closing effect on the seat valve (53) and a pull-back spring (23) that exerts an opening effect grip the wide pressure compensating plunger (20). The valve (10) is essentially designed as an on-off valve and can be controlled in the stable intermediate position through the following measures: the cone angle of the valve seat (28) amounts to 90 DEG at most; the force created by the pull-back spring (23) and exerted on the closing member (37) is so determined that it has a monotonic decreasing gradient on progressive increase of the valve opening stroke; the magnetic circuit of the valve (10) is so designed that the magnetic force exerted on the magnetic armature and transferred to the closing member (37) is continuously variable and has a monotonic decreasing gradient on progressive increase of the valve opening stroke, with a negative slope that is less than that of the spring force gradient.