Patent ID: 7055476

Claim:
A valve actuation (VA) apparatus for an internal combustion engine, comprising: a driving shaft which receives a torque of the engine; a crank cam which receives a torque of the driving shaft, the crank cam having an axis eccentric with an axis of the driving shaft; a crank arm comprising an annular portion to rotatably hold therein the crank cam, the crank arm converting the torque of the crank cam to a reciprocating force; a rocker arm which swings by a driving force derived from the crank arm; a pair of valve operating (VO) cams swingably supported on the driving shaft, the VO cams swinging by a rocking force derived from the rocker arm to drive engine valves, the VO cams being disposed on both sides of the crank cam, the VO cams directly holding therebetween the crank arm, the VO cams having inside end faces opposed to each other, the inside end faces having therebetween the annular portion of the crank arm supported in a sandwiched way from an axial direction of the driving shaft; and a pair of bearings used for the driving shaft and fixed to a cylinder, wherein the VO cams have outside end faces opposite to the inside end faces, the outside end faces being restricted in axial movement by the pair of bearings, and wherein the pair of VO cams and the crank arm are sandwiched between the pair of bearings in the axial direction.