INTERNAL COMBUSTION ENGINE VALVE HYDRAULIC DRIVE Russian patent published in 2000 - IPC

FIELD: transport engineering and mechanical engineering; internal combustion engines. SUBSTANCE: additional amplifier is placed in main line between spool-distributor and hydraulic cylinder which materially reduces energy consumption for driving the hydraulic pump, working liquid pressure in accumulator and load on parts of spool- distributor. To provide serviceability of hydraulic drive in case of leaks of working fluid from high pressure line between amplifier and hydraulic cylinder, compensating valve is used to maintain gauge pressure in line. To prevent striking of valve against piston at failures in drive control system, end of spool-distributor rides the cam of camshaft most of time. EFFECT: increased service life and provision operation reliability of hydraulic drive. 1 dwg