Vane-type cam phaser having staged locking pins to assist...

Details Vane-type cam phaser having staged locking pins to assist... Vane-type cam phaser having staged locking pins to assist...

2008-04-28

2011-10-11

Eshete, Zelalem (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090150, C123S090310

Reexamination Certificate

active

08033257

ABSTRACT:
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.

REFERENCES:
patent: 6779499 (2004-08-01), Takenaka et al.
patent: 2003/0121485 (2003-07-01), Strauss
patent: 2005/0284432 (2005-12-01), Tsukada
patent: 2007/0277758 (2007-12-01), Fishcer

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