Patent ID: 7107953

Claim:
A valve gear with a cylinder suspending mechanism of an internal combustion engine, comprising: a first rocker arm having a tip end connected to either one of an intake valve and an exhaust valve and pivotably supported on a first rocker shaft; a second rocker arm located at one side of said first rocker arm, pivotably supported on said first rocker shaft, and driven by a first cam for low speed; a third rocker arm located at the other side of said first rocker arm, pivotably supported on said first rocker shaft, and driven by a second cam for high speed; a first piston slidably fitted into a first cylinder formed in said first rocker arm; a second piston slidably fitted into a second cylinder formed in said first rocker arm; a first engaging projection extending from said second rocker arm and formed to be engageable with said first piston; a second engaging projection extending from said third rocker arm and formed to be engageable with said second piston; first and second switching mechanisms for applying oil pressure to said first and second pistons, to thereby switch these pistons between an engaging position and a non-engaging position with respect to said first and second engaging projections, respectively; and control means for controlling the switching of said first and second switching mechanisms, wherein said first piston is made smaller in diameter than said second piston.