Patent ID: 7404385

Claim:
A lift-variable valve-operating system for an internal combustion engine, comprising: a control arm ( 117 ) having support shaft portions ( 116 ) which are swingably supported in an engine body ( 111 ); a rocker arm ( 122 ) which is swingably supported on a swing support portion ( 131 ) provided in the control arm ( 117 ) and which abuts against an engine valve ( 112 ); and a subsidiary cam ( 121 ) which is swingably supported on the control arm ( 117 ) and which is driven by a valve-operating cam ( 114 ) to drive the rocker arm ( 122 ), the control arm ( 117 ) being rotated about the support shaft portions ( 116 ) by a control member ( 118 ) which is operated by an actuator ( 150 ) so as to change at least a valve lift of the engine valve ( 112 ), the system further comprising urging means ( 151 ) which urges the control arm ( 117 ) in a direction in which the control arm ( 117 ) abuts against the control member ( 118 ), the urging means ( 151 ) urging a portion of the control arm ( 117 ) where the swing support portions ( 131 ) are provided.