| 摘要 |
A valve timing adjusting apparatus includes a driving-side rotor, a driven-side rotor, and a directional control valve. The driven-side rotor is rotated in the advance direction when the advance and retard output ports communicate with the intake port and the retard drain port respectively, and the advance and retard output ports are disconnected from the advance drain port. The driven-side rotor is rotated in the retard direction when the advance and retard output ports communicate with the advance drain port and the intake port respectively, and the advance and retard output ports are disconnected from the retard drain port. A relay passage is provided at an exterior of the directional control valve for communication with the advance and retard drain ports. The drain relay passage closes the advance and retard drain ports relative to the exterior.
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