Patent ID: 7942120
Filing Date: 2011-05-17
Classification: F01L

Abstract:
1. A variable camshaft timing (VCT) system for an internal combustion engine, the VCT system comprising: a housing for accepting drive from a crankshaft of the engine; a rotor coaxially located within the housing for connection to a camshaft, the housing and the rotor defining at least one vane separating a chamber in the housing into a phaser advance chamber and a phaser retard chamber, the vane being capable of rotation to shift relative angular positions of the housing and the rotor; and a control valve having a spool slidably located within a bore in a valve sleeve, the spool positioned in the valve sleeve such that the spool moves oil between a valve advance chamber and the phaser advance chamber when the spool is moved, the spool further moving oil between a valve retard chamber and the phaser retard chamber when the spool is moved.