Patent ID: 8191522

Claim:
A method for varying the phase and lift of a rocker arm on a camshaft actuating a valve or injector, the method comprising the steps of: (a) pivotably connecting the rocker arm to a control arm about a pivot shaft, wherein a roller on a first end of the rocker arm rotatably engages with a cam, and a second end of the rocker arm slidably engages with a first valve or injector; (b) from a zero phase position of the roller in respect to a base circle of the cam, advancing an actuator causing the control arm to rotate in a first direction about a control arm pivot axis located at a first end of the control arm to an advanced phase position thereby advancing a timing of the first valve or injector; and (c) from the advanced phase position, reversing the actuator, causing the control arm to rotate in a second direction about the control arm pivot axis to a retarded phase position thereby retarding the timing of the first valve or injector.