Patent ID: 9476329
Filing Date: 2016-10-25
CPC Classification: F01L,F04C

Claim Text:
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 a phasing advance chamber and a phasing retard chamber with said input member; and a rotary valve spool coaxially disposed within said output member such that said rotary valve spool is rotatable relative to said output member and said input member, said rotary valve spool defining a rotary valve spool advance chamber and a rotary valve spool retard chamber; wherein oil supplied to said rotary valve spool advance chamber causes said rotary valve spool to rotate relative to said output member and relative to said input member in a retard direction; wherein oil supplied to said rotary valve spool retard chamber causes said rotary valve spool to rotate relative to said output member and relative to said input member in an advance direction; wherein rotation of said rotary valve spool in the advance direction allows oil to be supplied to said phasing retard chamber, thereby causing said output member to rotate relative to said input member in the advance direction; and wherein rotation of said rotary valve spool in the retard direction allows oil to be supplied to said phasing advance chamber, thereby causing said output member to rotate relative to said input member in the retard direction.