O&k Orenstein & Koppel Aktiengesellschaft

Uwe Rathje

Manfred Lappe

Hans Jurgen Schumacher

A steering gear with pitmans arm, steering tie rod and steering gear connecting rod for a vehicle with optionally hydraulically boosted, mechanical steering or purely hydraulic steering, and a hydraulic pump, driven by the drive engine, being connected via conduits and a flow regulating- and pressure limiting-valve to a directional control valve from which, on the one hand a line extends to a steering mechanism which is actuated from the steering gear via a cardan shaft and from which lines extend to a two-directional control valve which is connected with the hydraulic cylinders of the front axle and, on the other hand a line extends to a steering valve which is actuated by means of the steering gear and the cardan shaft, oil under pressure flowing either through a line to the directional valve connected with the cylinders for the front axle or through a line to the directional valve connected with the rear axle. The pressure oil is pumped by the pump over the first mentioned directional control valve to the connection of the steering valve, and depending upon the turning of the steering wheel, via a line and one control valve to the piston-side chamber of one rear axle hydraulic cylinder and to the piston-rod-side chamber of the other rear axle hydraulic cylinder, or the pressure oil flows from the steering valve via another line to another control valve and further via still another line over said one control valve to the piston-rod-side chamber of the one hydraulic cylinder and to the piston-side chamber of the other hydraulic cylinder.

Steering gear with steering-arm lever

A steering gear with steering drop arm, steering tie rod and steering gear connecting tie rod for a vehicle, which is drivable on wheels on the road and terrain, with a steering mechanism which is actuated selectively hydraulically supported mechanically or purely hydraulically by means of hydraulic cylinders and electromagnetic valves, whereby changing from the hydraulically supported system to the purely hydraulically operating system is by means of a selective connection of a universal shaft, which is connected with the steering wheel, with one of the two systems which serve the actuation of the steering mechanism. A hydraulic pump, driven by a drive motor, and acting on both systems, is connected with a first control valve via a line, a flow control- and pressure limit- valve and a line. On the one hand a line leads from the first control valve to a steering transmission, the latter being actuated by the steering gear by means of universal shaft. Lines lead from the steering transmission to a second control valve. The latter is connected with the hydraulic cylinders of the front axle. On the other hand a line leads from the first control valve to a steering valve which is actuated by means of the steering gear and the universal shaft. Pressurized oil either via a line to a third control valve and via a line therefrom flows to the hydraulic cylinders of the front axle, or via a line to a fourth control valve and via a line therefrom, the third control valve and a line flows to the hydraulic cylinders. Or pressurized oil either the line to the third control valve and via the line therefrom to the hydraulic cylinders of the front axle as well as via a line to the third control valve and via a line therefrom, the fourth control valve and a line flows to the hydraulic cylinders of the rear axle, or the pressurized oil via the line to the fourth control valve and via a line to the hydraulic cylinders of the rear axle as well as via a line to the fourth control valve and via a line, the third control valve and a line flows to the hydraulic cylinders of the front axle.

Steering gear with steering drop arm

An adjusting device for the main shield of a grader in which two lifting cylinder, a sideways adjusting cylinder and two pivot arms interconnected by an arresting bridge for actuating the main shield are by the arresting bridge linked to a bridge frame of the grader which bridge frame has a rectangular cross section. Each of the two pivot arms are arranged for pivoting about two joints while one of the pivot arms has its free end provided with fulcrums arranged asymmetrically with regard to the vertical axis of symmetry for establishing linkage connection with one lifting cylinder and a sideways adjusting cylinder. The other one of the two pivot arms is at its free ends provided with a fulcrum for establishing linkage connection with the other lifting cylinder. The arrangement is such that one joint each serves for journalling the pivot arms on a front wall fixedly connected to a frame member of the grader and to the back wall likewise fixedly connected to the frame member, whereas another joint edge serves for journalling the pivot arms on the movable arresting bridge. The quadrangular joint structure comprising the above mentioned four joints is non-symmetrically arranged with regard to the axis of symmetry of the vehicle frame member and is displaceably arranged in the vertical plane.

Growing community of inventors

Dortmund, Germany

Uwe Rathje