Variable geometry camshaft

Details Variable geometry camshaft Variable geometry camshaft

2007-05-08

2007-05-08

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090150, C123S090270, C123S090310

Reexamination Certificate

active

10871984

ABSTRACT:
The invention improves volumetric efficiency of the internal combustion engine. A suspended cam,1, follows a limited arc of rotation about the axis of a drive gear,3. A change in engine speed (r.p.m.) activates the hydraulic piston8, and alters the cam heel position along this arc that is tangent to a cam follower,9. The separation distance, between the cam follower and cam heel, determines the duration of valve opening. The separation distance and the rocker arm ratio control the amount of valve lift. As the cam axis sweeps across the cam follower, there is coordinated movement of the cam follower fulcrum,11. This tempers the otherwise excessive change in rocker arm ratio as the cam contact point on the cam follower moves in the “x” direction with rotation of the suspension assembly,2. The rotation of the cam axis and gear reduction assembly,4, 5, &6, about the drive gear, shifts the timing of cam contact. This timing shift creates a desirable asymmetrical expansion or contraction in the duration period of valve opening.

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Griffiths,Variable Geometry Camshaft,Brochure, Jun. 12, 2003.

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