Importance

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Abstract

A camshaft includes a device for hydraulic adjustment of a relative rotating position of the camshaft for the purpose of influencing valve timing. The device has a drive wheel, a cell wheel, and an impeller. The impeller is disposed, by way of vanes, within cells of the cell wheel and can carry out relative motion. A locking arrangement, which operates in the starting phase of the internal-combustion engine, is provided between the cell wheel and the impeller. The locking arrangement is formed by a spring-loaded, hydraulically operated piston housed in one of the blades of the impeller and by a corresponding receiving device for the piston provided in a constructional unit consisting of the drive wheel and the cell wheel. The piston of the vane interacting with the receiving device is acted upon from a pressure duct of the vane. A reversal valve in the pressure duct is connected to pressure spaces of one of the cells.

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First Claim