| 摘要 |
A valve timing controller for varying the rotating phase of a cam shaft which drives a valve of an internal combustion engine. A pulley is disposed on the circumference of the cam shaft at an end to be freely rotatable. In the pulley, a first hydraulic chamber and a second hydraulic chamber are made, and these hydraulic chambers are separated in the circumferential direction of the pulley by a vane located on the circumference of the cam shaft. By controlling the pressures in the first and second hydraulic chambers, the vane is set selectively in a middle position, a valve timing retardation position which is an opposite position with respect to a pulley rotating direction and a valve timing advance position which is a farther forward position with respect to the pulley rotating direction. The cam shaft rotates with the movement of the vane.
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