Electromagnetic actuating device

Patent metadata

Field	Value
Publication number	US-10121578-B2
Application number	US-201515306410-A
Country	US
Kind code	B2
Filing date	Mar 6, 2015
Priority date	Apr 29, 2014
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

A electromagnetic actuating device for a valve, having an armature arranged in a hollow cylindrical armature chamber axially displaceable between two axial stops, wherein the armature chamber is delimited by a magnet yoke. An electrical coil extends coaxially around the armature, and the magnet yoke is at least partially arranged in a housing. The armature has a cylindrical geometry with a base remote from the housing and with a hollow cylindrical end section situated axially opposite. The base is remote from the housing and connected to an actuating plunger. A guide sleeve is mounted axially onto the hollow cylindrical end section of the armature, and on that end of the guide sleeve which is remote from the actuating plunger, there is arranged or formed an adhesion prevention device which prevents or at least greatly impedes axial adhesion of the armature to the magnet yoke. The guide sleeve makes it possible to realize a reduction in width of the parasitic air gap between the armature and the magnet yoke in order to increase the actuating forces of the actuating device with simultaneously reduced number of components.

First claim

The invention claimed is:

1. An electromagnetic actuating device for a valve comprising:
an armature axially movably situated between two axial stops, an armature chamber being delimited by a magnet yoke;
an electrical coil coaxially encompassing the armature in the magnet yoke, and the magnet yoke being at least partially situated in a housing;
the armature having a cylindrical geometry including a base remote from the housing and, axially diametrically opposed, a hollow cylindrical end section, the base being connected to an actuating plunger, a guide sleeve being axially fitted onto the hollow cylindrical end section, and an anti-adhesion device being situated or formed at an end of the guide sleeve remote from the actuating plunger, preventing or at least impeding an axial adhesion of the armature to the magnet yoke, the guide sleeve including an attachment section having an inner circumferential surface permanently fixed to an outer circumferential surface of the armature.

2. The actuating device as recited in claim 1 wherein the guide sleeve has a guiding section for radially guiding the armature at a cylindrical inner circumferential surface of the magnet yoke and the attachment section axially connected thereto.

3. The actuating device as recited in claim 1 wherein the anti-adhesion device at the end of the guide sleeve remote from the actuating plunger is formed by a radially inwardly directed, at least in sections, circumferential contact section having at least one elevation facing away from the armature.

4. The actuating device as recited in claim 3 wherein the at least one elevation is a ring-shaped elevation extending axially in a direction of a base of a first magnet yoke segment near the housing, the first magnet yoke segment having radially inside a cup-shaped geometry forming an armature chamber for axially movably accommodating the armature.

5. The actuating device as recited in claim 1 wherein the magnet yoke is configured as two parts, including a first magnet yoke segment and a second magnet yoke segment, that the first magnet yoke segment having radially inside a cup-shaped geometry forming an armature chamber for axially movably accommodating the armature, the first magnet yoke segment forming radially outside of the armature chamber an axially open toroidal cavity for accommodating the coil, that the cavity at an open axial end being closed off by the second magnet yoke segment, and the coil being situated in the toroidal cavity.

6. The actuating device as recited in claim 5 wherein a base of the first magnet yoke segment near the housing forms a first axial stop for the armature of the two axial stops.

7. The actuating device as recited in claim 1 wherein the actuating plunger is axially movably accommodated in a sliding sleeve attached in a bore hole, coaxial to the actuating plunger, of a magnetizable bearing block, the discoidally formed bearing block being attached in a further bore hole coaxial to the actuating plunger in a base of a first magnet yoke segment of the magnet yoke remote from the housing, the bearing block closing off the armature chamber on the side of the actuating plunger and forming a second axial stop for the armature of the two axial stops.

8. The actuating device as recited in claim 1 wherein the guide sleeve is integrally manufactured from a metallic substance using the deep-drawing method.

9. The actuating device as recited in claim 1 wherein in an area of the guiding section of the guide sleeve an outer diameter of the armature is smaller than the inner diameter of the guide sleeve.

10. The actuating device as recited in claim 1 wherein in the attachment section of the guide sleeve a material thickness of the guide sleeve is reduced compared to a remaining material thickness of the remaining guide sleeve.

11. The actuating device as recited in claim 1 wherein the attachment section of the guide sleeve is rotationally and tensionally fixedly connected to the armature.

12. The actuating device as recited in claim 1 wherein an annular contact section of the guide sleeve covers an annular end face of the armature facing away from the base of the armature remote from the housing.

13. The actuating device as recited in claim 12 wherein an angle between the annular contact section of the guide sleeve and a cylindrical guiding section of the actuating device is at least 90°.

14. The actuating device as recited in claim 13 wherein the angle is greater than 90° so that the contact section runs in a conically inclined manner.

15. The actuating device as recited in claim 1 wherein an outer diameter of the armature is an area of the attachment section of the guide sleeve is equally large or smaller than an inner diameter of the guide sleeve such that the guide sleeve is press-fit to the armature.

16. The actuating device as recited in claim 1 wherein the guide sleeve is an anti-magnetic material.

17. The actuating device as recited in claim 16 wherein the anti-magnetic material is a metal.

18. The actuating device as recited in claim 16 wherein the anti-magnetic material is a plastic.

19. An electromagnetic actuating device for a valve comprising:
an armature axially movably situated between two axial stops, an armature chamber being delimited by a magnet yoke;
an electrical coil coaxially encompassing the armature in the magnet yoke, and the magnet yoke being at least partially situated in a housing;
the armature having a cylindrical geometry including a base remote from the housing and, axially diametrically opposed, a hollow cylindrical end section, the base being connected to an actuating plunger, a guide sleeve being axially fitted onto the hollow cylindrical end section, and an anti-adhesion device being situated or formed at an end of the guide sleeve remote from the actuating plunger, preventing or at least impeding an axial adhesion of the armature to the magnet yoke,
wherein the anti-adhesion device at the end of the guide sleeve remote from the actuating plunger is formed by a radially inwardly directed, at least in sections, circumferential contact section having at least one elevation facing away from the armature,
the at least one elevation being a ring-shaped elevation extending axially in a direction of a base of a first magnet yoke segment near the housing, the first magnet yoke segment having radially inside a cup-shaped geometry forming an armature chamber for axially movably accommodating the armature.

20. An electromagnetic actuating device for a valve comprising:
an armature axially movably situated between two axial stops, an armature chamber being delimited by a magnet yoke;
an electrical coil coaxially encompassing the armature in the magnet yoke, and the magnet yoke being at least partially situated in a housing;
the armature having a cylindrical geometry including a base remote from the housing and, axially diametrically opposed, a hollow cylindrical end section, the base being connected to an actuating plunger, a guide sleeve being axially fitted onto the hollow cylindrical end section, and an anti-adhesion device being situated or formed at an end of the guide sleeve remote from the actuating plunger, preventing or at least impeding an axial adhesion of the armature to the magnet yoke,
the guide sleeve being an anti-magnetic material.

Assignees

• Schaeffler Technologies Ag

Inventors

• Kinscher Markus
• Hoppe Jens

Classifications

• H01F7/081 Primary

  Magnetic constructions · CPC title

• F16K31/0675 Primary

  Electromagnet aspects, e.g. electric supply therefor · CPC title

• H01F7/121

  Guiding or setting position of armatures, e.g. retaining armatures in their end position · CPC title

• H01F3/00 Primary

  Cores, Yokes, or armatures (magnetic materials H01F1/00; permanent magnets H01F7/02) · CPC title

• H01F7/1607

  Armatures entering the winding · CPC title