Patent ID: 6647935
Filing Date: 2003-11-18
Classification: F01L,F02B,F02F

Abstract:
A reciprocating internal combustion engine comprising:a cylinder block having a cylinder; a piston movable through a stroke in the cylinder; an intake valve; an intake-valve lifter on a stem of the intake valve; an intake-valve drive shaft that rotates about its axis in synchronism with rotation of a crankshaft; a rockable cam that is rotatably fitted on an outer periphery of the intake-valve drive shaft, and that oscillates within predetermined limits during rotation of the intake-valve drive shaft so as to directly push the intake-valve lifter; and as viewed from an axial direction of the crankshaft, an axis of the intake-valve drive shaft being offset from a centerline of the intake-valve stem in a first direction that is normal to both a centerline of the cylinder and an axis of the crankshaft and directed from the cylinder centerline to an intake valve side, and the crankshaft axis being offset from the cylinder centerline in the first direction.