Patent ID: 7302923

Claim:
A variable valve timing device adapted for an internal combustion engine comprising: a first roller; a second roller; a support shaft; a cam shaft formed thereon with a first cam surface; a rocker arm rotatably supporting the first roller and enabling a valve to be opened by a swing movement of the rocker arm when the first roller is pressed; a swing cam formed thereon with a second cam surface, the swing cam being swingable at a center of the support shaft, when the second roller is pressed by the first cam surface of the cam shaft, so that the second cam surface presses the first roller; and an actuator for controlling the support shaft to move along a circular arc with a center at a central axis of the first roller which is in a state where the valve is opened, wherein a contact position between the first cam surface of the cam shaft and an outer surface of the second roller moves in a direction opposite to a rotational direction of the cam shaft when the support shaft is moved in a direction where a maximum lift amount of the valve becomes smaller.