Patent ID: 7261074

Claim:
A continuously variable valve lift system, comprising: a cam shaft provided in a cylinder head of an engine and rotated in conjunction with a crank shaft, with a plurality of cams provided on the cam shaft to open and shut intake and exhaust valves; a rotary adjuster set such that a rotating angle thereof is variably adjusted depending on an operational condition of the engine, with first contact parts provided at predetermined positions on the rotary adjuster and having predetermined curvatures; bearing members to be compressed both by the cams and by the first contact parts of the rotary adjuster, such that moving tracks of the bearing members vary dependently with the cams and the first contact parts; elastic members to bring the bearing members into contact with the cams and the rotary adjuster; and rocker arms in contact with and compressed by the bearing members and having second contact parts having predetermined curvatures, each of the rocker arms being pivotably supported at a first end thereof by a lash adjuster and compressing at a second end thereof each of the intake and exhaust valves, wherein the rotary adjuster is set such that a rotation center thereof is level with or is lower than a rotation center of the cam shaft based on a lower surface of the cylinder head, and the bearing members are disposed below the cam shaft and between the rotary adjuster and the rocker arms, wherein each of the bearing members comprises: a support shaft disposed along a longitudinal center line of the bearing member; first contact rings rotatably fitted at predetermined positions over a circumferential outer surface of the support shaft, such that each of the first contact rings contacts each of the first contact parts of the rotary adjuster; second contact rings rotatably fitted over the circumferential outer surface of the support shaft at positions close to inner sidewalls of the first contact rings, such that each of the second contact rings contacts each of the second contact parts of the rocker arms; and a third contact ring rotatably fitted over the circumferential outer surface of the support shaft at a position close to inner sidewalls of the second contact rings and being in contact with the associated cam.