Patent ID: 7673598

Claim:
An electric camshaft adjuster for adjusting and securing a phase angle of a camshaft of an internal combustion engine with respect to a crankshaft, comprising: a drive wheel which is connected fixedly in terms of rotation to the crankshaft, an output component which is fixed to the camshaft, a harmonic drive having at least one ring gear-spur gear pairing, the at least one ring gear-spur gear pairing having a first ring gear directly connected fixedly in terms of rotation to the drive wheel and a spur gear having at least a torque-transmitting connection to the output component, the spur gear being embodied as an elastic sleeve and arranged at least partially within the first ring gear, and a wave generator which is driven by an electric adjustment motor by means of an adjustment shaft which is fixed to the wave generator, the wave generator has means for elliptically deforming the elastic sleeve, causing a torque-transmitting connection to form between the first ring gear and the elastic sleeve at two points on the elastic sleeve lying opposite one another, wherein the first ring gear is formed in one piece with the drive wheel or the output component.