VEHICLE STEERING HYDRAULIC SYSTEM Russian patent published in 1995 - IPC

FIELD: transport engineering. SUBSTANCE: working fluid from hydraulic pump 1 is delivered to steering control valve unit 2. Control valve unit 2 is connected with like spaces of turning hydraulic cylinders 3 and 4, for instance, piston spaces, with first and second outputs of additional two-position five-way control valve unit 5 and, through OR valve 6, with one spool control chamber, other control chamber being connected with opposite spaces of hydraulic cylinders through OR valve 7 and connected also with third and fourth outputs of additional control valve unit 5 interconnected and connected with fifth output connected with return line. At considerable pressure rise in hydraulic system, spool of control valve unit 5 changes its position connecting rod space of each hydraulic cylinder with piston space of other hydraulic cylinder. Rod spaces are connected with other control chamber through OR valve 7 which prevents self-sustained oscillations of spool. EFFECT: enhanced operation reliability. 3 dwg