US-12620515-B2 - Electromagnet and method for mounting an electromagnet

US12620515B2US 12620515 B2US12620515 B2US 12620515B2US-12620515-B2

Abstract

An electromagnet includes a pre-assembly unit having a guide element and a coil, an armature which is arranged translationally displaceable in the guide element, and a core having an axially extending annular protrusion into which the pre-assembly unit is inserted.

Inventors

Berthold Herrmann
Halim Celik

Assignees

PIERBURG GMBH

Dates

Publication Date: 20260505
Application Date: 20210701
Priority Date: 20200702

Claims (19)

1 . An electromagnet comprising: a pre-assembly unit comprising a guide element and a coil; an armature which is arranged translationally displaceable in the guide element; and a core comprising an axially extending annular protrusion into which the pre-assembly unit is inserted, wherein, the guide element comprises a sleeve and a mounting protrusion which extends radially from an outer peripheral surface of the sleeve, the sleeve comprises an inner circumferential surface which is configured to directly guide the axially movable armature, the mounting protrusion is attached to the axially extending annular protrusion of the core the pre-assembly unit further comprises a cover and a plug which is electrically connected to the coil, the cover is fixed to the guide element, the guide element is interlockingly fastened to the cover, the guide element comprises a protrusion which extends axially to the cover, the cover comprises a protrusion which extends axially to the guide element, and the protrusion of the guide element and the protrusion of the cover interlock with each other.
2 . The electromagnet as recited in claim 1 , wherein, the axially extending annular protrusion of the core comprises an inner peripheral surface which comprises an annular shoulder, and the guide element is axially in contact with the annular shoulder.
3 . The electromagnet as recited in claim 1 , wherein at least one of, the guide element comprises a guide surface which is coated with a nickel coating or with a zinc-nickel coating, and the armature comprises an outer circumferential surface which faces radially towards the guide element, the outer circumferential surface being coated with a nickel coating or with a zinc-nickel coating.
4 . The electromagnet as recited in claim 1 , wherein the plug is configured integrally with the cover.
5 . The electromagnet as recited in claim 1 , wherein the cover is interlockingly fastened or adhesively fastened attached to the guide element.
6 . The electromagnet as recited in claim 1 , wherein the pre-assembly unit further comprises the armature.
7 . The electromagnet as recited in claim 1 , wherein the pre-assembly unit further comprises a spring which is arranged between the cover and the armature.
8 . An electromagnet comprising: a pre-assembly unit comprising a guide element and a coil; an armature which is arranged translationally displaceable in the guide element: a core comprising an axially extending annular protrusion into which the pre-assembly unit is inserted; and a flow housing, wherein, the guide element comprises a sleeve and a mounting protrusion which extends radially from an outer peripheral surface of the sleeve, the sleeve comprises an inner circumferential surface which is configured to directly guide the axially movable armature, the mounting protrusion is attached to the axially extending annular protrusion of the core, the core further comprises a central cylindrical portion and a connecting portion which is disposed radially between the central cylindrical portion and the axially extending annular protrusion, and the connecting portion is at least one of pressed, screwed and adhesively bonded to the flow housing.
9 . The electromagnet as recited in claim 8 , wherein, the axially extending annular protrusion of the core comprises an inner peripheral surface which comprises an annular shoulder, and the guide element is axially in contact with the annular shoulder.
10 . The electromagnet as recited in claim 8 , wherein at least one of, the guide element comprises a guide surface which is coated with a nickel coating or with a zinc-nickel coating, and the armature comprises an outer circumferential surface which faces radially towards the guide element, the outer circumferential surface being coated with a nickel coating or with a zinc-nickel coating.
11 . A method of mounting the electromagnet as recited in claim 10 , the method comprising: assembling at least one of the guide element, the coil, the armature, the plug, the cover, and the spring into the pre-assembly unit; and then inserting the pre-assembly unit into the axially extending annular protrusion of the core.
12 . The method as recited in claim 11 , further comprising: at least one of screwing, pressing and adhesively bonding the core to the flow housing.
13 . The method as recited in claim 11 , further comprising: attaching the pre-assembly unit to the core via a press-fit connection or an adhesive connection.
14 . The electromagnet as recited in claim 8 , wherein, the pre-assembly unit further comprises a cover and a plug which is electrically connected to the coil, and the cover is fixed to the guide element.
15 . The electromagnet as recited in claim 14 , wherein the plug is configured integrally with the cover.
16 . The electromagnet as recited in claim 14 , wherein the cover is interlockingly fastened or adhesively fastened attached to the guide element.
17 . The electromagnet as recited in claim 14 wherein the pre-assembly unit further comprises the armature.
18 . The electromagnet as recited in claim 14 , wherein the pre-assembly unit further comprises a spring which is arranged between the cover and the armature.
19 . The electromagnet as recited in claim 8 , wherein, the core further comprises a centering recess thereon; and the flow housing comprises, on a side facing the core, a centering element which interacts with the centering recess provided on the core.

Description

CROSS REFERENCE TO PRIOR APPLICATIONS This application is a U.S. National Phase application under 35 U.S.C. § 371 of International Application No. PCT/EP2021/068170, filed on Jul. 1, 2021 and which claims benefit to German Patent Application No. 10 2020 117 501.9, filed on Jul. 2, 2020. The International Application was published in German on Jan. 6, 2022 as WO 2022/003102 A1 under PCT Article 21(2). FIELD The present invention relates to an electromagnet with an armature, which is arranged translationally displaceable in a guide element, a core and a coil. The present invention also relates to a method for mounting an electromagnet. BACKGROUND Electromagnets, in particular those used for actuating valves, are generally known and are described in a large number of applications. The magnetic attraction force generated by a current flow in a coil is used to pull an armature in the direction of a core, wherein a magnetic circuit is closed by the core, the armature, a yoke, and any magnetic return elements present. Such an electromagnet is described, for example, in EP 2 966 329 A1. The electromagnet comprises a housing in which a coil carrier with a wound coil is arranged, wherein a return element is provided at each of the axial ends of the coil carrier. The coil carrier radially surrounds a guide pot in which a translationally moving armature and a pressed-in core are arranged. The disadvantage of such an electromagnet is that the electromagnet comprises a relatively large number of individual components which must be assembled individually and require many individual assembly steps. SUMMARY An aspect of the present invention is to provide an electromagnet with a reduced number of individual components and to simplify the assembly thereof. In an embodiment, the present invention provides an electromagnet which includes a pre-assembly unit comprising a guide element and a coil, an armature which is arranged translationally displaceable in the guide element, and a core comprising an axially extending annular protrusion into which the pre-assembly unit is inserted. BRIEF DESCRIPTION OF THE DRAWINGS The present invention is described in greater detail below on the basis of embodiments and of the drawings in which: FIG. 1 shows a cross-section of a first version of an electromagnet configured according to the present invention; and FIG. 2 shows a cross-section of a second version of an electromagnet configured according to the present invention. DETAILED DESCRIPTION The assembly of the electromagnet can be simplified by providing a pre-assembly unit comprising the guide element and the coil, wherein the core comprises an axially extending annular protrusion into which the pre-assembly unit is inserted. The metallic guide element is used as a carrier for the pre-assembly unit, wherein the coil with its coil carrier is attached to the guide element in a pre-assembly step. The pre-assembly unit is thereby assembled in a simple and cost-effective manner. In the final assembly step, the pre-assembly unit is connected to the core. For this purpose, the core comprises an annular protrusion into which the pre-assembly unit is inserted and fixed to the annular protrusion. Such a design of the electromagnet reduces the manufacturing and the assembly effort. The number of individual components of the electromagnet is also reduced in that the annular protrusion of the core radially surrounds a major portion of the mounting assembly, thereby forming the major portion of the body of the electromagnet. The pre-assembly unit can, for example, comprise a cover and a plug electrically connected to the coil, wherein the cover is attached, for example, adhesively bonded, to the guide member. The cover, together with the annular protrusion of the core, forms the housing of the electromagnet, so that no separate housing is required. The assembly effort and the manufacturing effort can thus be reduced in that no separate housing must be manufactured and assembled. The connector can, for example, be configured integrally with the cover, thereby reducing the manufacturing effort. The cover together with the annular protrusion of the core forms the housing of the electromagnet, so that no separate housing is required. The assembly effort and the manufacturing effort can thus be reduced in that no separate housing needs to be manufactured and assembled. In an embodiment, the pre-assembly unit can, for example, comprise the armature. The pre-assembly unit can, for example, comprise a spring, wherein the spring is arranged between the cover and the armature. This further simplifies the assembly of the electromagnet. The inner peripheral surface of the annular protrusion can, for example, comprise an annular shoulder, wherein the guide member is in axial contact with the annular shoulder. The pre-assembly unit is attached to the annular protrusion of the core via the guide element, wherein the annular protrusion comprises the annular shoulder