Sliding-pivot locking mechanism for an overhead cam with...

Internal-combustion engines – Poppet valve operating mechanism – Rocker

Reexamination Certificate

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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.

REFERENCES:
patent: 4727831 (1988-03-01), Nagahiro et al.
patent: 4777914 (1988-10-01), Konno
patent: 4887563 (1989-12-01), Ishida et al.
patent: 5280770 (1994-01-01), Satou et al.
patent: 2003/0029402 (2003-02-01), Pomerleau et al.
patent: 02-207134 (1990-08-01), None
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.

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