| 摘要 |
A phase change mechanism is described for varying the phase of an engine camshaft relative to the engine crankshaft. The mechanism comprises a drive member (10) to be connected to the camshaft drive, a driven member (14) to be connected to the camshaft, an eccentric (20) mounted for rotation about the axis of the camshaft, a coupling element (18) mounted about the eccentric and acting to transmit torque from the drive member to the driven member, and drive means (22) for rotating the eccentric to move the coupling element (18) relative to the drive and driven members (10, 14) and thereby vary the phase between the drive and driven members. To reduce noise caused by chattering of the coupling element (18) about the eccentric (20), means such as springs (19, 19') are provided for applying a constant additional force to the coupling element while the phase change mechanism is in rotation, the force acting in a direction transverse to the line of action of the reaction force reversals acting on the eccentric (20). |
