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;
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 supply passage and a second spool supply passage which is diametrically opposed to said first spool supply passage such that said first spool supply passage and said second spool supply passage each provide a path for pressurized oil to be supplied to said phasing volume from an oil source; and
a supply check valve within said valve spool bore which allows oil to flow to said phasing volume from said oil source while preventing oil from flowing from said phasing volume to said oil source;
wherein oil is supplied to said advance chamber from said phasing volume and oil is vented from said retard chamber to said venting volume in order to retard the timing of said camshaft relative to said crankshaft;
wherein oil is supplied to said retard chamber from said phasing volume and oil is vented from said advance chamber to said venting volume in order to advance the timing of said camshaft relative to said crankshaft; and
wherein said supply check valve is disposed within said phasing volume.
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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 supply passage and a second spool supply passage which is diametrically opposed to the first spool recirculation passage. The first spool supply passage and the second spool supply passage each provide a path for pressurized oil to be supplied to the phasing volume from an oil source.
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Citations
21 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; 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 supply passage and a second spool supply passage which is diametrically opposed to said first spool supply passage such that said first spool supply passage and said second spool supply passage each provide a path for pressurized oil to be supplied to said phasing volume from an oil source; and a supply check valve within said valve spool bore which allows oil to flow to said phasing volume from said oil source while preventing oil from flowing from said phasing volume to said oil source; wherein oil is supplied to said advance chamber from said phasing volume and oil is vented from said retard chamber to said venting volume in order to retard the timing of said camshaft relative to said crankshaft; wherein oil is supplied to said retard chamber from said phasing volume and oil is vented from said advance chamber to said venting volume in order to advance the timing of said camshaft relative to said crankshaft; and wherein said supply check valve is disposed within said phasing volume.
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2. 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; 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 supply passage and a second spool supply passage which is diametrically opposed to said first spool supply passage such that said first spool supply passage and said second spool supply passage each provide a path for pressurized oil to be supplied to said phasing volume from an oil source; and a supply check valve within said valve spool bore which allows oil to flow to said phasing volume from said oil source while preventing oil from flowing from said phasing volume to said oil source; wherein oil is supplied to said advance chamber from said phasing volume and oil is vented from said retard chamber to said venting volume in order to retard the timing of said camshaft relative to said crankshaft; wherein oil is supplied to said retard chamber from said phasing volume and oil is vented from said advance chamber to said venting volume in order to advance the timing of said camshaft relative to said crankshaft; and wherein said supply check valve comprises; a first check valve member which allows oil to enter said phasing volume through said first spool supply passage and which prevents oil from exiting said phasing volume through said first spool supply passage; and a second check valve member diametrically opposed to said first check valve member which allows oil to enter said phasing volume through said second spool supply passage and which prevents oil from exiting said phasing volume through said second spool supply passage.
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3. A camshaft 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; 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 supply passage and a second spool supply passage which is diametrically opposed to said first spool supply passage such that said first spool supply passage and said second spool supply passage each provide a path for pressurized oil to be supplied to said phasing volume from an oil source; and a supply check valve within said valve spool bore which allows oil to flow to said phasing volume from said oil source while preventing oil from flowing from said phasing volume to said oil source; wherein oil is supplied to said advance chamber from said phasing volume and oil is vented from said retard chamber to said venting volume in order to retard the timing of said camshaft relative to said crankshaft; wherein oil is supplied to said retard chamber from said phasing volume and oil is vented from said advance chamber to said venting volume in order to advance the timing of said camshaft relative to said crankshaft; wherein said phasing volume and said venting volume are defined by an insert that is disposed within said valve spool bore; and wherein said insert comprises; an insert first end wall; an insert second end wall spaced axially from said insert first end wall; an insert third end wall spaced axially from said insert second end wall such that said insert second end wall is axially between said insert first end wall and said insert third end wall; an insert first sidewall between said insert first end wall and said insert second end wall such that that said insert first sidewall connects said insert first end wall to said insert second end wall; and an insert second sidewall between said insert second end wall and said insert third end wall such that said insert second sidewall connects said insert second end wall to said insert third end wall and such that said insert second sidewall is offset relative to said insert first sidewall in a direction perpendicular to said axis. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. 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; 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 supply passage and a second spool supply passage which is diametrically opposed to said first spool supply passage such that said first spool supply passage and said second spool supply passage each provide a path for pressurized oil to be supplied to said phasing volume from an oil source; a supply check valve within said valve spool bore which allows oil to flow to said phasing volume from said oil source while preventing oil from flowing from said phasing volume to said oil source; and a lock pin which selectively engages a lock pin seat, wherein pressurized oil supplied to said lock pin causes said lock pin to retract from said lock pin seat to permit relative movement between said input member and said output member and wherein venting oil from said lock pin allows said lock pin to engage said lock pin seat in order to prevent relative motion between said input member and said output member at a predetermined aligned position; wherein oil is supplied to said advance chamber from said phasing volume and oil is vented from said retard chamber to said venting volume in order to retard the timing of said camshaft relative to said crankshaft; wherein oil is supplied to said retard chamber from said phasing volume and oil is vented from said advance chamber to said venting volume in order to advance the timing of said camshaft relative to said crankshaft; and wherein said phasing volume and said venting volume are defined by an insert that is disposed within said valve spool bore. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification