Valve control device for an internal combustion engine

A valve control device for an internal combustion engine comprising:

• a rotational cam shaft disposed on a cylinder head;
• a first cam provided on the cam shaft;
• a second cam provided on the cam shaft and having a larger nose portion than that of the first cam;
• a first rocker arm supported on a first fulcrum so as to be able to oscillate, a swing end of the first rocker arm being in contact with an intake or exhaust valve at a first contact point, and the first rocker arm being oscillated for opening and closing the intake or exhaust valve by the first cam in response to the rotation of the cam shaft;
• a second rocker arm supported on a second fulcrum so as to be able to oscillate, a swing end of the second rocker arm being operatively connected to the first rocker arm at a connection point, and the second rocker arm being oscillated for opening and closing the intake or exhaust valve by the second cam in response to the rotation of the cam shaft;
• and
• moving means for selectively moving the first fulcrum so as to control the opening and closing operation of the intake or exhaust valve by the first rocker arm, the second fulcrum so as to control the opening and closing operation of the intake or exhaust valve by the second rocker arm, and a third fulcrum supporting the first rocker arm so as to oscillate when the first fulcrum is moved, wherein the third fulcrum is farther separated from the swing end of the first rocker arm than the first fulcrum.