Patent ID: 9587526
Date: 2017-03-07
CPC Classifications: F01L

Claim:
1. A camshaft phaser for use with an internal combustion engine for controllably varying the phase relationship between a crankshaft and a camshaft in said internal combustion engine, said camshaft phaser comprising: an input member connectable to said crankshaft of said internal combustion engine to provide a fixed ratio of rotation between said input member and said crankshaft; an output member connectable to said camshaft of said internal combustion engine and defining an advance chamber and a retard chamber with said input member; and a valve spool moveable between an advance position and a retard position and having a valve spool bore with a phasing volume and a venting volume defined within said valve spool bore such that said phasing volume is fluidly segregated from said venting volume; wherein oil is supplied to said advance chamber from said phasing volume in order to retard the timing of said camshaft relative to said crankshaft; and wherein oil is supplied to said retard chamber from said phasing volume in order to advance the timing of said camshaft relative to said crankshaft.