Camshaft phaser

Patent metadata

Field	Value
Publication number	US-10082054-B2
Application number	US-201514936888-A
Country	US
Kind code	B2
Filing date	Nov 10, 2015
Priority date	Nov 10, 2015
Publication date	Sep 25, 2018
Grant date	Sep 25, 2018

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.

First claim

We 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.

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:
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.

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:
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.

4. A camshaft phaser as in claim 3 wherein said phasing volume is defined axially between said insert first end wall and said insert second end wall and is also defined axially between said insert second end wall and said insert third end wall.

5. A camshaft phaser as in claim 3 wherein said first spool supply passage and said second spool supply passage are aligned with said insert first sidewall along said axis.

6. A camshaft phaser as in claim 3 wherein:
said valve spool has a spool advance passage which provides a path for pressurized oil to be supplied to said advance chamber from said phasing volume in order to retard the timing of said camshaft relative to said crankshaft, said spool advance passage being aligned with said insert first sidewall along said axis;
said valve spool has a spool vent passage which provides a path for oil to vent from said retard chamber t

Assignees

• Delphi Tech Ip Ltd

Inventors

• Haltiner Jr Karl J
• Fischer Thomas H

Classifications

• F01L1/3442 Primary

  using hydraulic chambers with variable volume to transmit the rotating force · CPC title

• F01L1/047

  Camshafts · CPC title

• F01L2001/34423

  Details relating to the hydraulic feeding circuit · CPC title

• F01L2001/34433

  Location oil control valves · CPC title

• F16K15/14

  with flexible valve members · CPC title