Camshaft adjustment device to change rotational position of camshaft in relation to crankshaft has driving power of camshaft directed from crankshaft via hydraulic transmission formed by pump unit and hydromotor unit

摘要

The camshaft adjustment device to change the rotational position of a camshaft (10a) in relation to a crankshaft (11a) has the driving power of the camshaft directed from crankshaft via a hydraulic transmission (20a) formed by a pump unit (12a) and a hydromotor unit (13a). The hydromotor is designed to be adjustable to achieve a transmission change of the hydraulic transmission and to thereby change the rotational position of the camshaft in relation to the crankshaft. An independent claim is included for a method to change the rotational position of a camshaft in relation to a crankshaft by the use of a pump unit and hydromotor.