Patent ID: 7275476

Claim:
An oscillating motor comprising: a stator and a rotor mounted so as to be rotatable relative to one another, wherein the rotor is adapted to be fixedly mounted on a camshaft for effecting an adjustment of the camshaft relative to a crankshaft; wherein the stator has an inner wall and radially inwardly extending stator vanes connected to the inner wall; wherein the rotor has a base member and radially outwardly extending rotor vanes connected to the base member, wherein pressure chambers are delimited between sidewalls of the rotor vanes and sidewalls of the stator vanes, respectively; wherein the rotor vanes each have an end face resting against the inner wall of the stator; wherein the stator vanes have an end face, respectively, resting against a peripheral wall of the base member; wherein between the end face of the rotor vanes and the inner wall of the stator a sealing gap is formed, respectively; wherein the rotor vanes taper discontinuously from the end face of the rotor vanes, respectively, in a direction toward the base member so that the rotor vanes each have a widened section at the end face and a radially inwardly positioned section connecting the widened section to the base member, respectively; wherein the widened section increases a gap length of the sealing gap so that a sealing action between the pressure chambers on opposite sides of the rotor vanes is optimized and leakage between pressure chambers on opposite sides of the rotor vanes is reduced; wherein the sidewalls of the stator vanes diverge radially inwardly beginning at the inner wall of the stator and match a shape of the sidewalls of the rotor vanes; wherein the sidewalls of the stator vanes each have a first recess at the end face, respectively, wherein the first recesses face the rotor vanes and cause a damping effect when the rotor vanes approach the stator vanes; wherein the widened section has a width at the end face matching approximately 1.5 to 3 times a width of the radially inwardly positioned section; wherein the radially inwardly positioned section of the rotor vanes has substantially a constant width across a length of the radially inwardly positioned section.