VARIABLE COMPRESSION RATIO INTERNAL COMBUSTION ENGINE

摘要

The objective of the present invention is to minimize the contamination of a reduction gear (21) by contaminants, and tin increase reliability and durability. The present invention has a reduction gear (21) that reduces the rotation of an actuator of a variable compression ratio mechanism and transmits the result to the control shaft of the variable compression ratio mechanism. The actuator and the reduction gear are attached to the side wall of an engine main body with a housing (22) therebetween. An oil filter (24) that eliminates contaminants from within lubricating oil is attached to the housing (22) with an oil-pathway-forming body (50) therebetween. A portion of the lubricating oil supplied from the oil filter (24) immediately after having been filter purified is supplied to the reduction gear housing (64) of the housing (22) via the oil-pathway-forming body (50) and a bypass oil pathway (58) formed in the housing (22).