Steering gear with steering-arm lever

A steering gear with pitmans arm, steering tie rod and steering gear connecting rod for a vehicle which is drivable on the road and in terrain on wheels, with a steering mechanism which is actuated selectively hydraulically supported mechanically or purely hydraulically by means of hydraulic cylinders and electromagnetic valves, and a universal shaft which is connected with the steering wheel changing from the hydraulically supported system over to the purely hydraulically operating system by selectively connecting said universal shaft with one of two systems which serve the actuation of the steering mechanism, wherein in combination one of said systems comprises a steering transmission and the other of said systems includes a steering valve, said steering transmission and said steering valve being selectively actuated by said steering gear by selective connection with said universal shaft, respectively, said hydraulic cylinders include hydraulic cylinders of a front axle and hydraulic cylinders of a rear axle of the vehicle, further comprising

• a hydraulic pump operatively connected to both of said systems,
• motor means for driving said pump,
• a plurality of control valves,
• a flow control- and pressure limit-valve,
• first conduits and said flow control- and pressure limit-valve connecting said pump to a first of said control valves,
• a first line being connected to said first control valve and to said steering transmission,
• second lines are connected to said steering transmission and to a second of said control valves, said second control valve constituting a two-way control valve,
• third lines connecting said second control valve operatively with said hydraulic cylinders of the front axle of the vehicle,
• a fourth line being connected to said first control valve and to said steering valve,
• a fifth line being connected to said steering valve and a third of said control valves,
• a sixth line being connected to said hydraulic cylinders of the front axle,
• a seventh line being connected to said steering valve and to a fourth of said control valves,
• an eighth line being connected to said third and fourth control valves,
• a ninth line being connected to said third control valve and to said hydraulic cylinders of the front axle,
• two tenth lines connecting said fourth control valve with said hydraulic cylinders of the rear axle,
• said hydraulic cylinders of said rear axle including pistons and piston rods connected thereto, each of said hydraulic cylinders in cooperation with said pistons defining a piston-side chamber and a piston-rod-side chamber,
• one of said tenth lines connects to said piston-side chamber of one of said hydraulic cylinders of the rear axle and to the piston-rod-side chamber of the other of said hydraulic cylinders of the rear axle and the other of said tenth lines connects to the piston-rod-side chamber of said one of said hydraulic cylinders of the rear axle and to the piston-side-chamber of the other of said hydraulic cylinders of the rear axle,
• a first selective operative pressurized oil flow path comprising in order:
• said first conduits and said flow control- and pressure limit-valve to said first control valve, said fourth line, said steering valve, said fifth line connecting to said third control valve, said third control valve, said eighth line, said fourth control valve and said another of said tenth lines connecting to the piston-rod-side chamber of said one of said hydraulic cylinders of the rear axle and to the piston-side chamber of the other of said hydraulic cylinders of the rear axle,
• a second selective operative pressurized oil flow path comprising in order:
• said first conduits and said flow control- and pressure limit-valve to said first control valve, said fourth line, said steering valve, said seventh line connecting to said fourth control valve, said fourth control valve, said one of said tenth lines connecting to the piston-side chamber of said one of said hydraulic cylinders of the rear axle and to the piston-rod-side chamber of the other of said hydraulic cylinders of the rear axle,
• said steering wheel, said steering column and said universal shaft constituting means for selecting one of said first and second selective operative pressurized oil flow paths, respectively, depending on the turning of said steering wheel,
• other selective operative pressurized oil flow paths through selective of said lines and selective of said control valves to said hydraulic cylinders of said front axle, and respectively, to said hydraulic cylinders of said rear axle,
• said control valves being selectively switched such that any one of said selective operative pressurized oil flow paths is operative with flow of pressurized oil therethrough.