Rotary hydraulic coupling

Details Rotary hydraulic coupling Rotary hydraulic coupling

2008-04-04

2010-10-26

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090150, C123S090120, C464S160000

Reexamination Certificate

active

07819099

ABSTRACT:
A rotary hydraulic coupling is described for use in an engine having a camshaft, a hydraulic phaser for driving the camshaft, and an oil feed manifold secured to the body of the engine and incorporating oil galleries for supplying oil to the phaser. The rotary coupling, which serves to connect the oil galleries of the oil feed manifold to rotating oil ducts which lead to hydraulic working chambers within the phaser, comprises a cylindrical first element rotatably received within and sealed relative to an annular second element, each of the first and second elements having bores that communicate with annular grooves in a mating surface of at least one of the two elements to establish fluid flow communication between the bores in the two elements, the bores in the first element being connected to axially extending oil passages formed within the first element. In the invention, the first element is formed of an outer tube and an inner spool, and the axially extending oil passages in the first element are formed by channels and/or holes in the inner spool.

REFERENCES:
patent: 4928997 (1990-05-01), Reisener et al.
patent: 6247436 (2001-06-01), Lancefield et al.
patent: 6725817 (2004-04-01), Methley et al.
patent: 7228831 (2007-06-01), O'Gorman et al.
patent: 2003/0015157 (2003-01-01), Knecht et al.
patent: 2401150 (2004-03-01), None

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