Overhead camshaft drive assembly

Internal-combustion engines – Poppet valve operating mechanism – Camshaft drive means

Reexamination Certificate

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Details

C123S090150, C123S090270

Reexamination Certificate

active

10918615

ABSTRACT:
A variable timing camshaft drive assembly for an internal combustion engine utilizes a single cam phaser, driven by an engine crankshaft, capable of operating multiple camshafts carried on multiple banks of an engine. The cam phaser is carried on a hub extending from a mounting member attached to an engine block. The cam phaser includes an input sprocket and an output sprocket separated by a phasing device capable of altering the phase angle of the sprockets relative to one another. A first timing chain connects a drive sprocket of the crankshaft with the input sprocket of the cam phaser and a second timing chain connects the output sprocket of the cam phaser with the driven sprockets of the camshafts. As the phasing device alters the phase angle between the input and output sprockets, the phase angle between the camshafts and the crankshafts is altered.

REFERENCES:
patent: RE24645 (1959-05-01), Chayne
patent: 5033327 (1991-07-01), Lichti et al.
patent: 5113807 (1992-05-01), Kobayashi
patent: 5560329 (1996-10-01), Hayman
patent: 5564380 (1996-10-01), Kobayashi et al.
patent: 6367435 (2002-04-01), Okui et al.
patent: 2004/0154568 (2004-08-01), Yamauchi et al.
patent: 3619577 (1987-12-01), None

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