Magnetic actuator

Patent metadata

Field	Value
Publication number	US-9401236-B2
Application number	US-201113810764-A
Country	US
Kind code	B2
Filing date	Jun 14, 2011
Priority date	Jul 27, 2010
Publication date	Jul 26, 2016
Grant date	Jul 26, 2016

Abstract

Magnetic actuator includes a pole body having at least one magnetic region and at least one nonmagnetic region, the nonmagnetic region providing a magnetic isolation of the magnetic region. The pole body is developed as a one-piece component, and the magnetic regions and the nonmagnetic regions of the pole body are connected in a continuous material manner, using a two-component metal powder injection molding process.

First claim

What is claimed is:

1. A magnetic actuator, comprising:
at least one magnetic region;
at least one nonmagnetic region that provides a magnetic isolation of the magnetic region;
wherein:
the at least one magnetic region and the at least one nonmagnetic region are connected using a two-component metal powder injection molding process, such that the at least one magnetic region and the at least one nonmagnetic region form a single continuous integrated pole body;
the at least one nonmagnetic region is arranged alternatingly to the at least one magnetic region in a circumferential direction about the pole body;
the at least one magnetic region includes at least two magnetic regions and the at least one nonmagnetic region includes at least two nonmagnetic regions, the nonmagnetic regions providing an isolation of the magnetic regions from one another, and wherein all the magnetic regions and all the nonmagnetic regions of the pole body together form the single continuous integrated pole body; and a flange extending radially outwards from the pole body; and
at least one of:
(a) a lead-through for an electric contacting is situated in the flange; and
(b) the pole body is surrounded by a coil housing along at least a portion of an extent of the pole body along an axial direction of the pole body, and a coil is situated in a radial direction between the coil housing and the pole body.

2. The magnetic actuator as recited in claim 1 , wherein the pole body is surrounded by the coil housing along at least a portion of the extent of the pole body along the axial direction of the pole body, and the coil is situated in the radial direction between the coil housing and the pole body.

3. The magnetic actuator as recited in claim 2 , wherein an axial extension of the pole body is greater than an axial extension of the coil housing.

4. The magnetic actuator as recited in claim 3 , wherein the pole body has a central through hole.

5. The magnetic actuator as recited in claim 2 , wherein the nonmagnetic regions are smaller than the magnetic regions by a factor, the factor being a value in the range of 4 to 6.

6. The magnetic actuator as recited in claim 2 , wherein the nonmagnetic regions are smaller than the magnetic regions by a factor of 5.

7. The magnetic actuator as recited in claim 2 , wherein each of at least one of the nonmagnetic regions includes two faces that are radially opposite each other and that are parallel to each other.

8. The magnetic actuator as recited in claim 2 , wherein two lateral areas of the nonmagnetic regions of the pole body are configured parallel to each other.

9. The magnetic actuator as recited in claim 8 , wherein the pole body has four magnetic regions and four nonmagnetic regions.

10. The magnetic actuator as recited in claim 9 , wherein the pole body has a symmetrical configuration.

11. The magnetic actuator as recited in claim 2 , wherein the pole body includes a magnetic region that extends continuously circumferentially about the pole body at at least one axial end of the pole body.

12. The magnetic actuator as recited in claim 2 , wherein the pole body includes a respective magnetic region that extends continuously circumferentially about the pole body at each of the axial ends of the pole body.

13. The magnetic actuator as recited in claim 1 , wherein the lead-through for the electric contacting is situated in the flange.

14. The magnetic actuator as recited in claim 13 , wherein two lateral areas of the nonmagnetic regions of the pole body are configured parallel to each other.

15. The magnetic actuator as recited in claim 14 , wherein the pole body has four magnetic regions and four nonmagnetic regions.

16. The magnetic actuator as recited in claim 15 , wherein the pole body has a symmetrical configuration.

17. The magnetic actuator as recited in claim 13 , wherein the nonmagnetic regions are smaller than the magnetic regions by a factor, the factor being a value in the range of 4 to 6.

18. The magnetic actuator as recited in claim 13 , wherein the nonmagnetic regions are smaller than the magnetic regions by a factor of 5.

19. The magnetic actuator as recited in claim 13 , wherein each of at least one of the nonmagnetic regions includes two faces that are radially opposite each other and that are parallel to each other.

20. The magnetic actuator as recited in claim 13 , wherein the pole body includes a magnetic region that extends continuously circumferentially about the pole body at at least one axial end of the pole body.

21. The magnetic actuator as recited in claim 13 , wherein the pole body includes a respective magnetic region that extends continuously circumferentially about the pole body at each of the axial ends of the pole body.

22. A method for producing a one-piece pole body for a magnetic actuator, comprising:
providing a magnetic material and a nonmagnetic material; and
producing nonmagnetic regions and magnetic regions of the one-piece pole body using a two-component metal powder injection molding process such that the nonmagnetic regions and the magnetic regions are connected to one another in a continuous material manner, the nonmagnetic regions being arranged alternatingly to the magnetic regions in a circumferential direction about the pole body;
wherein at least one of:
the pole body extends distally from a first axial position at which the pole body is radially interior to a coil housing to a distal end of the pole body that is at a second axial position, the second axial position being beyond a distal end of the coil housing, the distal end of the pole body surrounding a proximal end of a valve needle housing, the entire valve needle housing being distal to the distal end of the coil housing; and
a flange extends radially outwards from the pole body, the nonmagnetic regions provide an isolation of the magnetic regions from one another, all the magnetic regions and all the nonmagnetic regions of the pole body together form the single continuous integrated pole body, and at least one of (a) a lead-through for an electric contacting is situated in the flange and (b) the pole body is surrounded by a coil housing along at least a portion of an extent of the pole body along an axial direction of the pole body, and a coil is situated in a radial direction between the coil housing and the pole body.

23. A magnetic actuator, comprising:
at least one magnetic region; and
at least one nonmagnetic region that provides a magnetic isolation of the magnetic region;
wherein:
the at least one magnetic region and the at least one nonmagnetic region are connected using a two-component metal powder injection molding process, such that the at least one magnetic region and the at least one nonmagnetic region form a single continuous integrated pole body;
the at least one nonmagnetic region is arranged alternatingly to the at least one magnetic region in a circumferential direction about the pole body; and
the pole body extends distally from a first axial position at which the pole body is radially interior to a coil housing to a distal end of the pole body that is at a second axial position, the second axial position being beyond a distal end of the coil housing, the distal end of the pole body surrounding a proximal end of a valve needle housing, the entire valve needle housing being distal to the distal end of the coil housing.

24. The magnetic actuator as recited in claim 23 , wherein the

Assignees

• Maier Dieter
• Bosch Gmbh Robert

Inventors

• Maier Dieter

Classifications

• F02M51/0614

  characterised by arrangement of electromagnets or fixed armature · CPC title

• F02M51/0685

  the armature and the valve being allowed to move relatively to each other or not being attached to each other · CPC title

• H01F7/11

  reducing or eliminating the effects of eddy currents · CPC title

• H01F7/081

  Magnetic constructions · CPC title

• H01F41/0246

  Manufacturing of magnetic circuits by moulding or by pressing powder (magnetic cores made by moulding or by pressing powder H01F27/255; soft magnetic particles H01F1/20, H01F1/36) · CPC title