| 摘要 |
A variable valve timing control apparatus includes a fixed member (23b) including a fixed peripheral surface (10) facing a rotation peripheral surface (14a) of a driven side rotation member (5). Plural seal rings (16a, 16b, 16c) are positioned between the rotation peripheral surface of the driven side rotation member and the fixed peripheral surface of the fixed member, the seal rings positioned spaced apart from each other by a predetermined distance. The seal ring sandwiched between two of a communication portion for advanced angle, a communication portion for retarded angle, and a communication portion for lock in a direction of the rotational axis among the plural seal rings includes a communication passage (20, 120, 220) which establishes constant communication between both sides thereof in association with the direction of the rotational axis when temperature of the pressurized fluid is within a temperature range which allows a control of the rotational phase of the driven side rotation member. |
