POSITIVE-DISPLACEMENT HYDRAULIC TRANSMISSION Russian patent published in 2002 - IPC

FIELD: manufacture of hydraulic machines. SUBSTANCE: positive- displacement hydraulic transmission has a pump with regulation mechanism; hydraulic motor; make-up pump; check and safety valves; slide control valve with feedback; valve device; filter device and safety devices; tank; main, auxiliary and control hydraulic lines. Main hydraulic line communicates main regulated pump with hydraulic motor by closed circuit. Auxiliary hydraulic line communicates make-up pump with tank and main hydraulic line via filters bank, check and safety valves and with return of working fluid to casing of main pump through safety valve. Control hydraulic line communicates regulation mechanism of main pump with outlet of slide control valve. Inlet of slide control valve is connected with main hydraulic line via valve device. Slide control valve has mechanical feedback with control mechanism. Safety devices communicate main hydraulic line with casings of main pump and hydraulic motor, tank and with auxiliary hydraulic line of make-up pump. EFFECT: reduced overall dimensions, higher reliability and prolonged service life; reduced heat release. 9 cl, 9 dwg