| 摘要 |
Provided is a valve opening/closing timing control device that makes it easier to reduce the weight of a driven rotating body while ensuring the strength thereof, and also makes it easier to downsize the entire device. The valve opening/closing timing control device includes: a driving rotating body; a driven rotating body; a fixed shaft portion by which the driven rotating body is supported coaxially with the driving rotating body; a fluid pressure chamber between the driving rotating body and the driven rotating body; a partitioning portion that partitions the fluid pressure chamber into an advancing chamber and a retarding chamber; and a phase control unit for controlling a rotation phase of the driven rotating body relative to the driving rotating body by supplying/discharging a pressurized fluid to/from the advancing chamber or the retarding chamber via an inside of the fixed shaft portion. The driven rotating body has: an inner circumferential member that has a cylindrical portion, and a coupling plate portion of the camshaft, the cylindrical portion and the coupling plate portion being integrated with each other; and an outer circumferential member provided with the partitioning portion. The outer circumferential member is provided with the inner circumferential member in a unified manner so as to have the same rotational axis. The inner circumferential member is formed with an iron-based material. The outer circumferential member is formed with a material that is lighter in weight than the iron-based material. |
