Vane-type cam phaser having staged locking pins to assist intermediate position locking

摘要

A vane-type camshaft phaser including a bias spring to urge the rotor toward an intermediate locking position from any rotational position retarded of the locking position. The rotor comprises non-coaxially acting primary and secondary locking pins for mating with primary and secondary locking pin seats in the phaser stator. The primary seat is elongated and is readily located by the primary locking pin to provide a first limit to the rotor phase angle authority in the retard direction. Camshaft torque reversals cause the rotor phase angle to dither. With each torque reversal the secondary locking pin passes over its seat, allowing multiple opportunities for re-engagement. The clearance of the secondary locking pin to its seat defines the rotary lash in the phaser.