| 摘要 |
The present invention relates to a variable valve timing system comprising a stator that can be connected to a crankshaft of an internal combustion engine, a rotor that is mounted for rotation relative to the stator and can be connected to a camshaft, and a locking system for locking the rotor relative to the stator by means of a locking link (2) made by a powder metallurgy process and provided on the stator or rotor, and at least one locking pin that can be locked in the locking link (2), wherein in at least one portion of a surface perimeter zone (3) the density of the locking link (2) is higher than the density of the base material of the locking link (2). |
