| 摘要 |
The invention provides a rotational phase adjustment device mounted on a rotation shaft and having a hydraulic chamber rotatable with this rotation shaft, in which operating fluid or oil can be supplied to the hydraulic chamber from a housing covering the rotational phase adjustment device. Also, the invention provides a rotational phase adjustment device which can be assembled easily, and particularly prevents damages to an oil seal, sealing a hydraulic chamber, when assembling the oil seal. A housing is attached to an engine to cover the whole of a valve timing control device, and a ring plate is secured to the housing by a bolt threaded into the ring plate from the outside of the housing, so that an oil seal mounted on an outer periphery of the ring plate is held in liquidtight sliding contact with a camshaft sleeve to form two oil passages respectively inside and outside of the camshaft sleeve. The two oil passages are independent of each other, and connect a hydraulic control valve to a pair of hydraulic chambers provided respectively on opposite sides of a hydraulic piston in an axial direction. Helical splines are formed on at least one of inner and outer surfaces of the hydraulic piston, and are engaged with splines formed on the camshaft sleeve and a sprocket sleeve. Therefore, by moving the hydraulic piston in the axial direction, a valve timing is changed.
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