초록 ▼

An arrangement for controlling a hydraulic motor having a movable member with opposite faces to be impinged by pressure fluid, in which first valve means serve to direct pressure fluid against a respective one of the opposite faces to thus control the direction of movement of the movable member, and

An arrangement for controlling a hydraulic motor having a movable member with opposite faces to be impinged by pressure fluid, in which first valve means serve to direct pressure fluid against a respective one of the opposite faces to thus control the direction of movement of the movable member, and in which second valve means connected in a hydraulic circuit with the first valve means serve to control the speed of the motor in connection with control means actuated by the movable member for controlling the change of the speed dependent on the position of this member.

대표청구항 ▼

In combination with a hydraulic motor having a movable member with a pair of opposite faces to be alternatingly impinged by pressure fluid to move the movable member in one and the opposite direction, a control arrangement for controlling the hydraulic motor comprising a source of pressure fluid; a

In combination with a hydraulic motor having a movable member with a pair of opposite faces to be alternatingly impinged by pressure fluid to move the movable member in one and the opposite direction, a control arrangement for controlling the hydraulic motor comprising a source of pressure fluid; a pair of conduit means for feeding pressure fluid from said source onto said opposite faces, or to discharge pressure fluid therefrom; first valve means interconnected with said conduit means for controlling the direction of movement of said movable member; second valve means interconnected with said conduit means for controlling the speed of the movable member in dependence on the position thereof and comprising a throttle valve in one of said conduit means and having a valve slide movable between a plurality of positions respectively controlling the amount of pressure fluid passing therethrough, a pressure reducing valve upstream of said throttle valve in said one conduit, and a proportional magnet connected to said valve slide for moving the same between the positions thereof; a first inductively operated position transducer connected with said proportional magnet into a feed-back position control circuit; a first electrical control device coordinated with said feedback position control circuit; control means actuated by said movable member for influencing the change of the speed of the latter in dependence on the position thereof, said control means including at least a second inductively operating position transducer for indicating the actual value of displacement of said movable member, said control means forming part of a second feedback circuit.