Patent ID: 8640661

Claim:
A continuously variable valve timing apparatus comprising: a camshaft; an end plate connected to the camshaft; a drive sprocket rotating the end plate; a first friction plat disposed to be coaxial to the end plate a second friction plate disposed to be coaxial to the end plate; a first brake selectively braking the first friction plate; a second brake selectively braking the second friction plate; a control gear portion which changes relative phase between the end plate and the drive sprocket according to braking of the first friction plate or the second friction plate; a first gear formed to the first friction plate; a second gear formed to the second friction plate; and a housing which is connected to the drive sprocket and a housing gear is formed therein; and the control gear portion comprises: a worm shaft rotatably coupled to the end plate; a third gear which is formed to one end of the worm shaft and engaged with the first gear; a fourth gear which is formed to the other end of the worm shaft and engaged with the second gear; and a worm wheel rotatably coupled to the end plate and meshed with the worm shaft and the housing gear.