Patent ID: 7168404

Claim:
A variable valve apparatus of an internal combustion engine, comprising: a camshaft provided rotatably in the internal combustion engine; a cam formed on the camshaft; an oscillating cam provided oscillatably in the internal combustion engine, and having a cam surface which drives an intake valve or an exhaust valve; a transmission arm which is interposed between the oscillating cam and the cam, and which transmits the displacement of the cam to the oscillating cam; and a control shaft which is configured to change a position where the transmission arm comes into contact with the cam by rotation displacement, and which controls valve characteristics of the intake valve or the exhaust valve by the position change, the control shaft being provided rotatably in the internal combustion engine and supporting the transmission arm oscillatably, an oscillating fulcrum of the transmission arm and a rotation center of the control shaft being, at a high valve lift and high speed operation of the internal combustion engine, arranged between a direction of a component rotating the control shaft of a maximum load which is applied at the oscillating fulcrum of the transmission arm when the oscillating cam oscillates in a valve opening direction, and a direction of a component rotating the control shaft of a maximum load opposite thereto, said maximum load being applied at the oscillating fulcrum of the transmission arm when the oscillating cam oscillates in a valve closing direction.