ELECTROMAGNETIC ACTUATING DEVICE

Abstract

An electromagnetic actuating device includes a pole sleeve that extends along an axial direction and an armature situated radially inside the pole sleeve. The pole sleeve has a first axial end and a second axial end. The armature is guided inside the pole sleeve. The pole sleeve has, in a region situated between the axial ends, recesses whose contours each change along the axial direction.

Claims

1-10. (canceled)

11. An electromagnetic actuating device, comprising: a pole sleeve extending along an axial direction; and an armature situated radially inside the pole sleeve; wherein the pole sleeve has a first axial end and a second axial end, and the armature is guided inside the pole sleeve, and wherein the pole sleeve has, in a region situated between the axial ends, recesses whose contours each change along the axial direction.

12. The electromagnetic actuating device as recited in claim 11, wherein the recesses have a V-shaped contour, the V-shaped contour tapering toward the first axial end.

13. The electromagnetic actuating device as recited in claim 11, wherein the pole sleeve has oblong openings extending in a circumferential direction and that are configured in a series in the circumferential direction, the recesses, each extending out from the oblong openings, extending along the axial direction.

14. The electromagnetic actuating device as recited in claim 13, wherein the oblong openings are each separated from one another in the circumferential direction by a web, the webs each having a reduced material thickness.

15. The electromagnetic actuating device as recited in claim 11, wherein the pole sleeve is a sleeve that is stamped and shaped by rolling.

16. The electromagnetic actuating device as recited in claim 15, wherein the pole sleeve is formed at least partly by stamping.

17. The electromagnetic actuating device as recited in claim 11, wherein the pole sleeve is fashioned with an open joint, or the pole sleeve is bonded at the joint by latching or welding.

18. The electromagnetic actuating device as recited in claim 11, wherein for the guiding of the armature, a glass fabric film coated by PTFE is radially situated between the pole sleeve and the armature.

19. The electromagnetic actuating device as recited in claim 11, wherein for the guiding of the armature, the pole sleeve has on its inner circumference, and/or the armature has on its outer circumference, a magnetically non-conductive coating at least in some segments.

20. The electromagnetic actuating device as recited in claim 19, wherein the coating includes a nickel layer or a nickel-phosphorus layer,

21. The electromagnetic actuating device as recited in claim 11, wherein the pole sleeve is made of magnetically conductive steel.

22. The electromagnetic actuating device as recited in claim 11, wherein the pole sleeve is made of magnetically conductive unalloyed steel having a carbon content of less than 0.15 percent.

23. The electromagnetic actuating device as recited in claim 11, wherein the pole sleeve has a material thickness of from 1 to 4 millimeters, and/or an electromagnetic coil is situated radially outside the pole sleeve, and/or the pole sleeve is made in one piece.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG. 1 shows a schematic section through an electromagnetic actuating device in accordance with an example embodiment of the present invention.

[0030] FIG. 2 shows the pole sleeve of the actuating device of FIG. 1, in a side view.

DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS

[0031] In FIG. 1, an electromagnetic actuating device is designated as a whole by reference character 10 (in the following: “actuating device 10”). Such an actuating device 10 is used for example in transmission technology in motor vehicles, in particular to control a coupling of an automatic transmission. For this purpose, for example a hydraulic valve (shown only schematically in FIG. 1 by a box provided with reference character 12) is actuated by actuating device 10.

[0032] Actuating device 10 has a housing 14 in which the components of actuating device 10 are situated. Actuating device 10 has an electromagnetic coil 16 that has a coil body 18 and a winding 20. At a first end face 22, housing 14 is closed by a terminating piece 24, for example a flow plate 24. At a second end face 26, housing 14 is closed by a cover 28, for example a pole plate 28. On housing 14, an electrical contacting 30 is provided that is electrically connected to electromagnetic coil 16.

[0033] In addition, actuating device 10 has an armature 32 (magnetic armature), a pole sleeve 34 (magnetic sleeve), and a pole core 35. Pole core 35 has a centric passage 38 through which an actuating element 40 is guided (actuating pin) that acts on hydraulic valve 12. Actuating element 40 can have a shaft segment 42 and a radially expanded head segment 44.

[0034] Armature 32 is situated radially inside pole sleeve 34. Electromagnetic coil 16 is situated radially outside pole sleeve 34. Coil 16, armature 32, and pole sleeve 34 at least partly overlap one another along axial direction 46. Pole sleeve 34 has a first axial end 48 (facing pole core 35) and a second axial end 50 (facing away from pole core 35). Armature 32 has a centric axial passage 31 and an armature bolt 33 situated therein that actuates actuating element 40.

[0035] Pole sleeve 34 is fashioned as a stamped sleeve, shaped by rolling (see FIG. 2); pole sleeve 34 can also be formed partly by stamping. Pole sleeve 34 has an (axially oriented) joint 52 at which the joint ends of pole sleeve 34 abut one another.

[0036] Pole sleeve 34 has a plurality of axial regions (in the sequence from first axial end 48 to second axial end 50): a (first) region 54 for conducting the magnetic flux, a plunger stage region 56, a region 58 of the magnetic separation, and a (second) region 60 for conducting the magnetic flux (see FIG. 2).

[0037] In a region (plunger stage region 56) situated between the axial ends 48, 50, pole sleeve 34 has recesses 62 whose contours each change along axial direction 46. Recesses 62 have a V-shaped contour that narrows towards first axial end 48. Recesses 62 are distributed regularly around the circumference of pole sleeve 34; here this is illustrated as an example with four recesses 62. Recesses 62 can be fashioned for example as perforations 62 or as stamped regions having reduced material thickness.

[0038] Pole sleeve 34 has (in the region of magnetic separation 58) oblong openings 64 that extend in the circumferential direction of pole sleeve 34, and that are configured in a series in the circumferential direction, the recesses 62, each going out from the oblong openings 64, extending along axial direction 46 (toward first axial end 48). Oblong openings 64 are also distributed regularly around the circumference of pole sleeve 34, here illustrated as an example with four openings 64. Oblong openings 64 can be fashioned for example as oblong holes 64.

[0039] Oblong holes 64, i.e. two oblong holes 64 adjacent to one another in the circumferential direction, are separated from one another in each case in the circumferential direction of pole sleeve 34 by a web 66. Webs 66 each have a reduced material thickness (reduced sheet thickness). Webs 66 can be stamped.

[0040] Pole sleeve 34 can be made with an open joint 52, or can be bonded at joint 52, for example by latching or welding (not shown).

[0041] For the guiding of armature 32, a glass fabric film 70 coated with PTFE can be situated radially between pole sleeve 34 and armature 32 (bearing element for armature 32). Alternatively, pole sleeve 34 can have on its inner circumference, or armature 32 can have on its outer circumference, a magnetically non-conductive coating at least in some sections, preferably completely, in particular a nickel layer or a nickel-phosphorus layer.

[0042] Pole sleeve 34 is made of magnetically conductive steel, in particular from magnetically conductive unalloyed steel having a carbon content of less than 0.15 percent. Pole sleeve 34 has a material thickness (plate thickness) of from 1 to 4 mm. Pole sleeve 34 is made in one piece.