Patent ID: 6779501
Filing Date: 2004-08-24
Classification: F01L

Abstract:
A phaser for limiting leakage across a plurality of chambers for an internal combustion engine having at least one camshaft comprising:a housing having an outer circumference for accepting drive force; a rotor for connection to a camshaft coaxially located within the housing; the housing and the rotor defining at least one vane separating the plurality of chambers, the vane being capable of rotation to shift the relative angular position of the housing and the rotor, a spool valve comprising a spool having a plurality of lands slidably mounted within in a bore in the rotor, the spool slidable to route operating fluid from a supply of pressurized fluid to the chambers; and at least one passage from the supply to the chambers for providing makeup fluid, wherein the passage contains a check valve and a restrictor.