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 along an axis 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, said valve spool having a first spool recirculation passage and a second spool recirculation passage which is diametrically opposed to said first spool recirculation passage;
wherein oil is supplied to said advance chamber from said retard chamber through said first spool recirculation passage, said second spool recirculation passage, and 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 advance chamber through said first spool recirculation passage, said second spool recirculation passage, and said phasing volume 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 and an output member defining an advance chamber and a retard chamber; a valve spool moveable along an axis between an advance position and a retard position and having a valve spool bore with a phasing volume and a venting volume defined therein such that the phasing volume is fluidly segregated from the venting volume, the valve spool having a first spool recirculation passage and a second spool recirculation passage which is diametrically opposed to the first spool recirculation passage. The first spool recirculation passage and the second spool recirculation passage provide paths for oil to flow from the advance chamber or the retard chamber to the phasing volume depending on the position of the valve spool.
18 Citations
28 Claims
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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:
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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 along an axis 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, said valve spool having a first spool recirculation passage and a second spool recirculation passage which is diametrically opposed to said first spool recirculation passage; wherein oil is supplied to said advance chamber from said retard chamber through said first spool recirculation passage, said second spool recirculation passage, and 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 advance chamber through said first spool recirculation passage, said second spool recirculation passage, and said phasing volume 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, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification