| 摘要 |
A valve timing control apparatus, includes a drive wheel in driving relation with the crankshaft and has a hollow space with at least one hydraulic working chamber demarcated by two boundary walls extending inwardly from an inner wall surface of the drive wheel. Mounted in fixed rotative engagement with the camshaft and fitted in the hollow space of the drive wheel is a rotatable impeller having at least one vane to subdivide the working chamber in two hydraulic pressure compartments. A seal, positioned between a free end face of the vane of the impeller and the inner wall surface of the drive wheel, fluidly seals the pressure compartments from one another and is formed by a roller-type sealing member spring-mounted in radial direction in an axial groove of the vane. The inner wall surface forms for the sealing member a slanted ramp surface which extends radially outwards in a rotation direction of the impeller, so that a torque is transmittable onto the impeller by a tangential force component resulting from a combination of the slanted ramp surface of the drive wheel and a radial spring force of the sealing member applied upon the impeller.
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