Internal-combustion engines – Poppet valve operating mechanism – Rocker
Reexamination Certificate
2008-01-16
2010-12-07
Eshete, Zelalem (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Rocker
C123S090160, C123S090150
Reexamination Certificate
active
07845324
ABSTRACT:
A locking mechanism for a plural rocker arm valve train assembly is provided. The locking mechanism is adapted for use with a camshaft having a plurality of different cam lobes having a plurality of different profiles, which result in variable valve displacement and duration. A plurality of rocker arms are located on a pivot shaft which runs parallel to the camshaft, each rocker arm having structures configured to be acted upon by respective lobes of the camshaft. An active rocker arm has structure configured to act upon an engine valve or valves. A movable locking element is fully enclosed by the rocker arms and is capable of selectively moving along the pivot shaft to allow the active rocker arm to selectively engage one or more of the other rocker arms for common pivoting, resulting in varied displacement of the engine valve or valves.
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Kiyoshi Hatano, et al., Development of a New Multi-Mode Variable Valve Timing Engine, SAE Technical Paper, Mar. 1, 1993, Document No. 930878.
Kazuo Inoue, et al., A High Power, Wide Torque Range, Efficient Engine With a Newly Developed Variable-Valve-Lift and Timing Mechanism, SAE Paper, Feb. 1, 1989, Document Number 890675.
Gecim Burak A.
Manole John I.
Eshete Zelalem
GM Global Technology Operations Inc.
Quinn Law Group PLLC
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