Borgwarner Inc.

Robert G Williamson

Kevin B Todd

Dale N Smith

Keith B Cobb

Paul Freemantle

Seongdo Hong

Jeffrey H Lewis

Fenton O'Shea

Adam C Hunt

A hydraulic tensioner for an internal combustion engine for tensioning a span of a chain or a belt has a piston with an internal reservoir connected to a high pressure chamber through a check valve assembly. The check valve assembly has a disk seat formed by an internal bulge within the piston; a check valve retainer within the piston, and a moveable disk that is received between the disk seat formed by the internal bulge and the check valve retainer and is moveable between a first position and a second position, and a check valve spring that is received between the check valve disk and the check valve retainer.

Tensioner with piston containing an internal check valve

A tensioner for tensioning a chain or belt span which uses two pistons. The movement of the two pistons may be coupled together. The first piston provides damping to the chain span and a second piston provides variable, dominant and automatically adjusting spring force to the chain span. The tensioner automatically adjusts the mean tension force to keep the chain or belt tension as low as possible without sacrificing chain or belt control, significantly improving drive efficiency at new chain or belt conditions and conditions with dynamic loads.

Tensioner with spring force control

The phaser of the present invention includes a reed plate. The reed plate has reed valves, which control the flow of hydraulic fluid. The reed valves are all inclusive on the reed plate. Worn trails in the surface of the parts sandwiching the reed plate direct the flow to and from the reed valves.

Reed valve VCT phaser with worm trails

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Breesport, NY, United States of America

Robert G Williamson