OIL SUPPLY DEVICE FOR INTAKE/EXHAUST VALVE STEM OF INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To reduce occurrence of failure to enhance reliability, and largely reduce a manufacturing cost and a maintenance cost. SOLUTION: An oil supply device comprises: a main valve 11 performing intake/exhaust; an auxiliary valve 21 switching between intake and exhaust passages 3, 4; a main valve air piston 14 for restoration operation of operation of the main valve; an auxiliary valve air piston 24 for restoration operation of the operation of switching operation of the auxiliary valve; an air spring chamber 26 storing working air of the main valve air piston and the auxiliary valve air piston; a seal 30 interposed between the main valve stem 12 and the auxiliary valve stem 22; and an oil supply part forcibly supplying lubricating oil in the air spring chamber. The oil supply part comprises: a check valve 34 opened when hydraulic pressure of the lubricating oil supplied from a hydraulic pressure control mechanism 10 exceeds predetermined pressure P0; an outer cylinder part 36, and an inner fitting part 37 fitted in the outer cylinder part with a minute clearance from the outer cylinder part; and a nozzle 35 supplying the lubricating oil into the air spring chamber through the minute clearance. COPYRIGHT: (C)2009,JPO&INPIT