Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Reexamination Certificate
2006-06-06
2009-11-10
Chang, Ching (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
C123S090170, C123S090650, C464S160000
Reexamination Certificate
active
07614370
ABSTRACT:
A vane-type camshaft phaser for varying the timing of combustion valves in an internal combustion engine includes a seat formed in the sprocket at the appropriate position of intermediate rotation and a locking pin slidably disposed in a vane of the rotor for engaging the seat to lock the rotor at the intermediate position. A bias spring system disposed on a cover plate urges the rotor toward the locking position from any position retarded of the locking position. A first spring system embodiment comprises a pair of compression spring assemblies. A second spring system embodiment comprises an internal torsion spring. In each embodiment, the phaser may be assembled without having the spring system coupled to the rotor, thereby overcoming a rotor cocking problem inherent in prior art phasers, assuring reliable mounting of an assembled phaser onto an engine camshaft.
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Cuatt, Daniel R. and Fischer, Thomas H.,; pending U.S. Appl. No. 11/225,772, entitled, “Vane-Type Cam Phaser Having Increased Rotational Authority, Intermediate Position Locking and Dedicated Oil Supply”, filed with the U.S. Patent & Trademark Office on Sep. 13, 2005.
Borraccia Dominic
Fischer Thomas H.
Chang Ching
Delphi Technologies Inc.
Twomey Thomas N.
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