VARIABLE COMPRESSION RATIO INTERNAL COMBUSTION ENGINE

摘要

A variable compression ratio internal combustion engine rotates a camshaft to cause relative movement between a crankcase and a cylinder block. The camshaft has a shaft member, a cam member fixed to the shaft member, and a movable bearing member rotatable with respect to the shaft member. The cam member is rotatably housed in a cam housing hole formed in the crankcase, and the movable bearing member is rotatably housed a bearing housing hole formed in the cylinder block. The length of a line segment joining the centers of the shaft member and the movable bearing member, the center of the movable bearing member being the center of rotation of the movable bearing member with respect to the bearing housing hole, is set to be longer than the length of a line segment joining the centers of the shaft member and the cam member, the center of the cam member being the center of rotation of the cam member with respect to the cam housing hole.