Patent ID: 6763793
Filing Date: 2004-07-20
Classification: F01L

Abstract:
A valve system for an internal combustion engine, comprising:a first rocker arm supported by a first rocker shaft such that the first rocker arm rocks when driven by a first cam, the first rocker arm having an end thereof connected to one of an intake valve and an exhaust valve; a second rocker arm supported by the first rocker shaft such that said second rocker arm rocks when driven by a second cam having a different cam profile from that of the first cam, the second rocker arm disposed adjacently with respect to said first rocker arm; a cylinder formed in one of said first and second rocker arms; a piston slidably mounted in said cylinder; an engagement projection that projects from the other one of said first and second rocker arms and selectively engages with an engagement part formed in said piston; and a piston position switching device that switches a position of said piston between an engagement position where said engagement projection is engaged with said piston and a disengagement position where said engagement projection is not engaged with said piston, said piston position switching device having a return spring that forces said piston to the disengagement position, and said return spring being disposed eccentrically with respect to said piston in such a direction as to get away from said engagement projection.