Patent ID: 6131541
Filing Date: 2000-10-17
Classification: F01L

Abstract:
An apparatus for adjusting an engine valve mechanism, the valve mechanism including a reciprocating valve having a lift, wherein the valve mechanism is actuated by a cam, the apparatus comprising:a camshaft for driving the cam, the camshaft having a first end;an engagement surface on the cam for slidably contacting the valve mechanism, wherein the radius of the engagement surface of the cam varies in the axial direction of the camshaft in at least an angular section of the cam;a rotor for driving the camshaft, wherein the rotor surrounds the camshaft at the first end;an actuator mechanism for rotating the camshaft relative to the rotor to change the valve timing of the valve and for moving the camshaft in the axial direction to change the lift of the valve; anda ring gear located at the first end of the camshaft, wherein the ring gear is connected to the rotor, wherein the rotor defines a space near the first end of the camshaft, wherein the ring gear divides the space into a first chamber receiving a hydraulic fluid pressure to move the ring gear in a first direction and a second chamber receiving a hydraulic fluid pressure to move the ring gear in a second direction.