| 摘要 |
<p>A lift-variable valve-operating system for an internal combustion engine, comprising:
a control arm (117) which is swingably supported in an engine body through support shaft portions (116) provided on a pair of sidewalls, respectively;
a plurality of rocker arms (122) which are swingably supported on spherical surfaced bearings between the pair of sidewalls of the control arm (117) and which abut against engine valves (112); and
a subsidiary cam (121) which is swingably supported between the pair of sidewalls 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 to change at least a valve lift of the engine valve (112),
the control arm (117), including a bulkhead between the adjacent rocker arms (122) so as to prevent falling of the rocker arms (122).
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