Borgwarner Inc.

James Sisson

Mark M Wigsten

Christopher J Pluta

David C White

A variable cam timing assembly () and method for an internal combustion engine of a motor vehicle includes a cam phaser () connected between an inner camshaft () and an outer camshaft () of a concentric camshaft (). A torsional drive mechanism () connects between the cam phaser () and the inner camshaft () for transmitting rotational torque. The torsional drive mechanism () permits adjustment for perpendicularity and axial misalignment of the inner and outer camshafts (), while maintaining a torsionally stiff coupling between the cam phaser () and one of the inner and outer camshafts () of the concentric camshaft (). The torsional drive mechanism () can be formed from one of a flexible shaft coupling (), a transversely split driven gear (), a transversely split sprocket ring gear (), a transverse face spline gear (), and a pin and slot combination drive ().

Concentric camshaft phaser torsional drive mechanism

A variable cam timing apparatus () and method of assembly for transmitting rotational torque between a driving rotary member () and a driven rotary member (). The flexible coupling () can include an axis of rotation coinciding with, and an outer peripheral edge () extending at least partially around, or completely surrounding, a common rotational axis of the driving rotary member () and the driven rotary member (). The flexible coupling () including a flexible body () having a plurality of apertures () formed therein at angularly spaced positions relative to one another for connection therethrough with respect to the driving and the driven rotary members () permitting adjustment for perpendicularity and axial misalignment, while maintaining a torsionally stiff coupling between the driving and driven rotary members (). A cam phaser () and concentric camshaft () define at least in part the driving rotary member () and the driven rotary member () for operating a poppet-type valve () of an internal combustion engine () of a motor vehicle ().

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Locke, NY, United States of America

James Sisson