WHEELED VEHICLE STEERING HYDRAULIC SYSTEM Russian patent published in 1995 - IPC

FIELD: steering systems. SUBSTANCE: wheeled vehicle steering hydraulic system has main hydraulic control valve unit kinematically coupled through pump-motor with steering wheel and hydraulically coupled with power cylinder and hydraulic tank and pump-motor and, through auxiliary control valve unit provided with drive from piston position pickup, with power cylinder spaces. It has also three-line two-position control valve unit, OR valve and flow regulator. Three-line two-position control valve unit is controlled by working fluid pressure and is connected by first hydraulic line with pump, by second hydraulic line with pressure-relief valve, and by third hydraulic line with flow regulator. Three-line two-position control valve unit is connected by hydraulic control line with one of hydraulic lines of pump-motor. Flow regulator with drive from speed transducer is made in form of restrictor with controller and safety valve. Outputs of pressure-relief valve and flow regulator are interconnected by OR valve whose outgoing hydraulic line is coupled with main hydraulic control valve unit. EFFECT: enlarged operating capabilities owing to provision of possibility to control speed of return of steerable wheels to neutral position. 2 dwg