Fast-acting lock pin assembly for a vane-type cam phaser

Details Fast-acting lock pin assembly for a vane-type cam phaser Fast-acting lock pin assembly for a vane-type cam phaser

2005-04-26

2005-04-26

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090150, C074S56800M, C092S121000

Reexamination Certificate

active

06883478

ABSTRACT:
A fast-acting rotor-locking mechanism for a vane-type camshaft phaser. A straight-sided locking pin is disposed in a bushing in the rotor and is urged into a sprocket well by a return spring. A pad disposed at the bottom of the well is a travel stop for the pin. When the pin is fully seated against the pad, the pad covers a portion of the end of the pin. The uncovered portion of the pin end, exposed to oil pressure for unlocking the pin when it is fully seated, is decreased over the prior art pin, permitting use of a lighter locking spring having a lower spring rate. Because of the lighter locking spring, the pin accelerates more rapidly and unlocks significantly faster than in a comparable prior art phaser.

REFERENCES:
patent: 5535705 (1996-07-01), Eguchi et al.
patent: 5797361 (1998-08-01), Mikame et al.
patent: 6276322 (2001-08-01), Sekiya et al.
patent: 6311655 (2001-11-01), Simpson et al.
patent: 6378477 (2002-04-01), Fukuhara et al.
patent: 6386164 (2002-05-01), Mikame et al.
patent: 6637390 (2003-10-01), Dauer et al.

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