Particulate trap for a camshaft phaser

Patent metadata

Field	Value
Publication number	US-10054015-B2
Application number	US-201615356765-A
Country	US
Kind code	B2
Filing date	Nov 21, 2016
Priority date	Nov 21, 2016
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

A camshaft phaser, including: an axis of rotation; a stator with a radially outer surface including a plurality of teeth; a rotor located radially inwardly of the stator; a chamber bounded at least in part by the stator and the rotor; a locking cover; a spring cover non-rotatably connected to the locking cover; a space enclosed, at least in part, by the spring cover and the locking cover; a plurality of fasteners non-rotatably connecting the stator and the locking cover; a spiral spring located in the space and including a first end fixed to the stator; and a magnetic trap located within the space and including a magnet.

First claim

The invention claimed is:

1. A camshaft phaser, comprising:
an axis of rotation;
a stator with a radially outer surface including a plurality of teeth;
a rotor located radially inwardly of the stator;
a chamber bounded at least in part by the stator and the rotor;
a locking cover;
a spring cover non-rotatably connected to the locking cover;
a space enclosed, at least in part, by the spring cover and the locking cover;
a spiral spring located in the space and including a first end fixed to the stator; and,
a magnetic trap located within the space, the magnetic trap including a magnet.

2. The camshaft phaser of claim 1 , wherein:
the magnet is separated, in a radial direction orthogonal to the axis of rotation, from the spiral spring; or,
a line orthogonal to the axis of rotation passes through the magnet and the spiral spring.

3. The camshaft phaser of claim 1 , wherein the magnetic trap includes a portion of the space, the portion enclosed, at least in part, by the locking cover, the spring cover and the magnet.

4. The camshaft phaser of claim 3 , wherein:
the magnetic trap includes a retaining pin fixedly connecting the magnet to the locking cover; and,
the portion of the space is bounded, in part, by the retaining pin.

5. The camshaft phaser of claim 4 , wherein:
the portion of the space includes an opening:
facing in a first circumferential direction; and,
connecting the portion of the space to a remainder of the space; and,

the opening is bounded by the spring cover, the retaining pin, the magnet and the locking cover.

6. The camshaft phaser of claim 5 , wherein:
the magnet includes a side facing, at least in part, radially outward; and,
the magnet trap includes at least one magnetic field line generated by the magnet, the at least one magnetic field line passing radially inwardly through the portion of the space and the side of the magnet.

7. The camshaft phaser of claim 5 , wherein the portion of the space is sealed from the remainder of the space except for the opening.

8. The camshaft phaser of claim 1 , wherein:
the magnet includes a first side facing, at least in part, radially outward; and,
the magnet trap includes a plurality of magnetic field lines generated by the magnet, the plurality of magnetic field lines passing radially inwardly through the first side.

9. The camshaft phaser of claim 8 , wherein:
the magnetic trap includes a portion of the space bounded:
on a radial inner side by the first side of the magnet;
on a radial outer side by the spring cover; and,
axially by the spring cover and the locking plate; and,

the plurality of magnetic field lines passes through the portion of the space.

10. The camshaft phaser of claim 9 , wherein:
the magnet includes a second side facing, at least in part, radially inwardly; and,
the plurality of magnetic field lines passes radially inwardly through the second side.

11. The camshaft phaser of claim 9 , wherein the portion of the space is:
open to a remainder of the space in a first circumferential direction; and,
blocked off from the remainder of the space in a second circumferential direction, opposite the first circumferential direction.

12. The camshaft phaser of claim 1 ,
wherein the magnet includes a side facing in a circumferential direction; and,
wherein:
a line orthogonal to the axis of rotation is co-linear with the side; or,
the line orthogonal to the axis of rotation forms an acute angle with the side.

13. A camshaft phaser, comprising:
an axis of rotation;
a stator with a radially outer surface including a plurality of teeth;
a rotor;
a locking cover;
a spring cover including a radially outer side directly connected to the locking cover;
a space enclosed by the locking cover and the spring cover;
a spiral spring located in the space and including a first end fixed with respect to the stator; and,
a magnetic trap including:
a portion of the space; and,
a magnet having a radially outwardly facing side, the magnet located:
within the portion of the space; and,
radially between the spiral spring and the radially outer side of the spring cover, wherein:

the portion of the space is enclosed, at least in part, by the locking cover, the spring cover and the magnet; and,
the magnetic trap includes a plurality of magnetic field lines generated by the magnet, the plurality of magnetic field lines:
passing radially inwardly through the portion of the space; and,
passing radially inwardly through the radially outwardly facing side of the magnet.

14. A method of operating a camshaft phaser including a stator, a rotor, a chamber bounded at least in part by the stator and the rotor, a spring cover having a radially outer wall directly connected to a locking cover, a space enclosed by the spring cover and the locking cover, a spiral spring located in the space, and a magnet located in the space, the method comprising:
generating, with the magnet, magnetic field lines; and,
passing the magnetic field lines through the space.

15. The method of claim 14 , wherein passing the magnetic field lines through the space includes passing the magnetic field lines radially inwardly through a portion of the space bounded, at least in part, by the magnet and the spring cover.

16. The method of claim 14 , further comprising:
passing the magnetic field lines radially inwardly through a side of the magnet facing, at least in part, radially outwardly.

17. The method of claim 14 , wherein passing the magnetic field lines through the space includes passing the magnetic field lines radially inwardly through a portion of the space bounded on a radial inner side by a radially outwardly facing side of the magnet and bounded on a radial outer side by the spring cover, the method further comprising:
passing the magnetic field lines radially inwardly through the radially outwardly facing side of the magnet.

18. The method of claim 14 , further comprising:
passing the magnetic field lines through fluid located in the space; and,
attracting magnetic particulate, suspended in the fluid, to the magnet.

19. The method of claim 18 , wherein:
passing the magnetic field lines through fluid located in the space includes passing the magnetic field lines through fluid located in a portion of the space bounded on a radial inner side by a radially outwardly facing side of the magnet and bounded on a radial outer side by the spring cover, the method further comprising:
adhering the magnetic particulate to the radially outwardly facing side of the magnet.

20. The method of claim 18 , further comprising:
rotating the camshaft phaser in a first circumferential direction;
displacing, radially outwardly, non-magnetic particulate suspended in the fluid and located outside of the portion of the space;
displacing, in a second circumferential direction opposite the first circumferential direction, the non-magnetic particulate into the portion of the space; and,
blocking displacement, in the second circumferential direction, of the non-magnetic particulate out of the portion of the space.

Assignees

• Schaeffler Technologies Ag

Inventors

• Becker David

Classifications

• F01L2001/34453

  Locking means between driving and driven members · CPC title

• F01L2001/34436

  Features or method for avoiding malfunction due to foreign matters in oil · CPC title

• F01L1/46

  Component parts, details, or accessories, not provided for in preceding subgroups · CPC title

• F01L1/3442 Primary

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

• F01L2001/34483

  Phaser return springs · CPC title