Patent ID: 7363895

Claim:
A lift-variable valve-operating system for an internal combustion engine, comprising: a control arm ( 117 ) which is swingably supported in an engine body ( 111 ) through support shaft portions ( 116 ) provided on a pair of sidewalls ( 127 ), respectively; a rocker arm ( 122 ) which is swingably supported on 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 an actuator ( 150 ) to change at least a valve lift of the engine valve ( 112 ), the pair of sidewalls ( 127 ) of the control arm ( 117 ) being connected by a connecting wall ( 129 ) to each other at positions of the pair of the support shaft portions ( 116 ).