Patent ID: 7228831
Filing Date: 2007-06-12
Classification: F01L,Y10T

Abstract:
1. An adjustable camshaft system for an automotive engine, comprising: a camshaft mounted within a cylinder head upon a plurality of camshaft bearings, including a front bearing, and with said camshaft having a driven end extending from said front bearing; an oil-activated camshaft phaser attached to the driven end of the camshaft, with said phaser having at least one timing advance port and at least one timing retard port; a plurality of axially directed control passages operatively associated with said driven end of said camshaft and extending from said front camshaft bearing to said camshaft phaser, with each of said control passages comprising an axially directed groove formed in a cylindrical surface of the driven end of the camshaft, and with said grooves being capped by a cylindrical sleeve applied to said driven end; a plurality of control ports formed in said cylindrical sleeve in registry with said axially directed grooves, with said control ports being in axial registry with a plurality of oil control passages extending radially through the front camshaft bearing; at least one exterior signal port formed in said cylindrical sleeve and extending from one of said control passages, with said exterior signal port being in axial registry with one of said timing advance port and said timing retard port; and at least one interior signal port formed within an inner annular wall of said camshaft and extending from one of said control passages, with said interior signal port being in axial registry with an annular passage extending to one of said timing advance port and said timing retard port.