FIELD: mechanical engineering; four-stroke piston internal combustion engines. SUBSTANCE: one-valve timing gear has housing of cylinder head 1, spring-loaded poppet valve 2, timing cylindrical sleeve 3 installed coaxially with poppet valve 2 inside housing of cylinder head 1. Diameter of valve plate is 0.6-0.85 of cylinder diameter, and inner diameter of timing cylindrical sleeve is equal to diameter of valve plate. Timing cylindrical sleeve 3 is installed inside cylinder head 1 between suction space 4 and exhaust space 5 and has two diametrically opposite spring-loaded rods-pushers 6 which provide vertical displacement of timing cylindrical sleeve 3. Spring dampers 8 are installed on ends of rods-pushers 6 to prevent striking of timing sleeve 3 against seat 7 in external lower position and rods-pushers 6 are spring-loaded. EFFECT: improved performance characteristics of engine. 4 dwg
