Camshaft phaser
First 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, said valve spool 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, and said valve spool also having a spool phasing passage providing fluid communication between said phasing volume and the exterior of said valve spool;
wherein oil is supplied to said advance chamber from said phasing volume through said spool phasing passage 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 through said spool phasing passage in order to advance the timing of said camshaft relative to said crankshaft.
2 Assignments
0 Petitions
Accused Products
Abstract
A camshaft phaser includes an input member; an output member defining an advance chamber and a retard chamber with the input member; a valve spool moveable between an advance position and a retard position. The valve spool has a phasing volume and a venting volume defined therein such that the phasing volume is fluidly segregated from the venting volume. The valve spool also has a passage providing fluid communication between the phasing volume and the exterior of the valve spool. Oil is supplied to the advance chamber from the phasing volume through the passage in order to retard the timing of a camshaft and oil is supplied to the retard chamber from the phasing volume through the passage in order to advance the timing of the camshaft.
16 Citations
20 Claims
-
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, said valve spool 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, and said valve spool also having a spool phasing passage providing fluid communication between said phasing volume and the exterior of said valve spool; wherein oil is supplied to said advance chamber from said phasing volume through said spool phasing passage 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 through said spool phasing passage in order to advance the timing of said camshaft relative to said crankshaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method of using 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, said valve spool 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, and said valve spool also having a spool phasing passage providing fluid communication between said phasing volume and the exterior of said valve spool;
said method comprising;placing said valve spool in said advance position to supply oil to said retard chamber from said phasing volume through said spool phasing passage in order to retard the timing of said camshaft relative to said crankshaft; and placing said valve spool in said retard position to supply oil to said advance chamber from said phasing volume through said spool phasing passage in order to advance the timing of said camshaft relative to said crankshaft. - View Dependent Claims (11)
- 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
-
12. 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:
-
a stator having a plurality of lobes and connectable to said crankshaft of said internal combustion engine to provide a fixed ratio of rotation between said stator and said crankshaft; a rotor coaxially disposed within said stator, said rotor having a plurality of vanes interspersed with said lobes defining a plurality of alternating advance chambers and retard chambers; and a valve spool moveable between an advance position and a retard position, said valve spool 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, and said valve spool also having a spool phasing passage providing fluid communication between said phasing volume and the exterior of said valve spool; wherein oil is supplied to said advance chambers from said phasing volume through said spool phasing passage in order to retard the timing of said camshaft relative to said crankshaft; and wherein oil is supplied to said retard chambers from said phasing volume through said spool phasing passage in order to advance the timing of said camshaft relative to said crankshaft. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
-
Specification