EP3391392B1 - Electromagnetic actuator as well as actuating system - Google Patents

Description

The invention relates to an electromagnetic actuating device, in particular a traction device, with a stationary coil device, with a movably guided armature forming an actuating section, in particular tie rod, which can be adjusted axially along an adjustment axis in response to energization of the coil device is, as well as with a one-piece, the anchor-receiving, pot-shaped yoke core element having a core section and a yoke section with a yoke core bottom extending perpendicular to the adjustment axis and a yoke core jacket extending perpendicular to the yoke core bottom along the adjustment axis, in which a longitudinal, reduced-thickness transition area between the core section and the yoke section, a guide pin for the armature being fixed, in particular pressed in, in a, preferably central, guide pin recess in the yoke core bottom, said guide pin being axially in one e, preferably central, guide opening of the armature protrudes and relative to which the armature is adjustable during its adjustment movement.

Such an actuator is in the EP2528070 A2 described. Such as in the DE 10 2006 015 233 B4 The actuating devices described by the applicant are adapted and optimized to the respective actuating task with regard to the housing, core, yoke and anchor geometry. The actuating device described in the aforementioned publication is suitable for mass production and can be manufactured automatically due to the provision of a one-piece yoke core element, in contrast to the example in FIG DE 198 82 903 T1 or the DE 202 18 782 U1 described adjusting device in which separate core and yoke elements are provided.

Despite the basically good series producibility of the generic actuator having a one-piece yoke core element, efforts are being made to further improve the suitability for large-scale production, in particular in the case of electromagnetic actuators which, in contrast to the in the DE 10 2006 015 233 B4 described adjusting device are not designed as pressure adjusting devices but as a pulling device having tie rods.

Proceeding from the aforementioned prior art, the invention is therefore based on the object of specifying a large-volume electromagnetic actuating device which is characterized by good automatability, while at the same time minimizing installation space. In a preferred variant, the electromagnetic adjusting device is to be designed as a pulling device, in which the armature then forming a tie rod is adjusted in the direction of the yoke core base when the coil device is energized. Even more preferably, the electromagnetic actuating device should also be usable in the context of an actuating system for applications in which the armature, in particular by the actuating partner, is subjected to a torque which tends to rotate the armature about its adjustment axis, in particular at high speed.

This object is achieved with regard to the electromagnetic actuating device with the features of claim 1, i.e. in the case of a generic actuating device in that an anti-rotation pin extending parallel to the guide pin is arranged adjacent to the guide pin and fixed, in particular pressed, in an anti-rotation pin recess in the yoke core base.

When realizing the actuating device according to the invention as a pulling device, the armature can also be moved in different ways in one direction away from the yoke core bottom, for example by reversing the polarity of the current supply to the coil device and / or by spring force loading an optionally provided check spring and / or by a tensile force applied by the actuating partner.

Advantageous developments of the invention are specified in the subclaims.

In an advantageous manner according to the invention, a large number of functionalities of the actuating device are realized in a multifunctional assembly, the fulcrum of which is the one-piece yoke core element. According to the invention, it is provided that the yoke core element, in addition to a magnetic flux guiding function and a flux coupling function of the core section for coupling the magnetic flux into the armature, also has a carrier function or holding function for holding a guide pin for the armature, namely that which extends perpendicular to the adjustment axis and preferably at the same time a stop to limit the axial adjustment movement of the armature-forming yoke core has a, in particular central, guide pin recess, within which a guide pin is fixed, preferably by pressing, which during its axial adjustment movement, in particular over the entire maximum adjustment distance, into a corresponding, preferably centric Guide opening of the armature protrudes and extends parallel to the longitudinal extent of the sleeve-shaped yoke section.

As an additional functionality of the one-piece yoke core element, it is provided in a further development of the invention that this, in particular on its inner circumference, more preferably on the inner circumference of the yoke section arranged axially adjacent to the core section, offers a support or holding surface for a slide bearing, which, for example, by pressing and / or Gluing and / or welding and / or is otherwise fixed to the yoke core element and which guides the armature on its outer circumference during its axial adjustment movement.

In summary, it is provided according to the further development that essential guide functions for the anchor, which is preferably designed or controlled as a tie rod, are concentrated on the yoke core element, which is the direct carrier for a guide pin for guiding the anchor on its inner circumference and carrier for a slide bearing for guiding the anchor on its outer circumference.

The use of the one-piece yoke core element according to the invention results in a magnetic short circuit in the transition area between the core and the yoke, which in this transition area can preferably achieve magnetic saturation even at low coil currents, which has negative effects on efficiency and efficiency on the one-piece formation of the yoke and keep core within limits. This effect can be further reduced by the fact that, according to a preferred development of the invention, the electromagnetic actuating device receives the effect of a proportional magnet working against a spring effect, so that short-circuit-related losses lie outside the operating core line in the force / stroke diagram of the device and therefore have no significant effect.

Overall, it is of particular advantage if the core section and / or the yoke section taper / taper longitudinally in their thickness in the direction of the transition region and are set up such that a force-displacement characteristic of the adjusting device is linear over the stroke with constant coil current.

It has been found to be particularly advantageous if the guide pin recess in the yoke core base is designed as an axial through opening, in particular a through hole, which is more preferably closed at the end, ie on the axial side facing away from the armature, by the guide pin. As will be explained later , an axially adjustable, preferably elastomeric stop damping element can be supported in the axial direction, in particular on the bottom, in this closed opening or, in an alternative embodiment, on the bottom of a blind hole opening, with which the anchor is supported in a stop position adjusted in the direction of the core section, is supported in particular on the end face on the guide pin. It is also advantageous if the guide opening in the armature is also designed as a through-opening, on the one hand because of a simpler manufacture and on the other hand for fixing a plunger or plunger section of the armature to a preferably sleeve-shaped guide section which has the guide opening and which is then on its side Outer circumference is guided on the plain bearing (plain bearing bush).

By combining the above-mentioned, at least two bearing functionalities in the yoke core element and the preferred indirect or direct end stop function of the yoke core base, complex geometries that would be necessary in terms of production if the functionalities were implemented independently of one another can be dispensed with and installation space can also be saved.

It is particularly expedient if the yoke core element takes on additional functionality in addition to the two bearing functionalities and serves as a holder for an anti-rotation pin, which is arranged adjacent to a longitudinal central axis of the armature and which extends parallel to the guide pin into an anti-rotation pin recess. This anti-rotation pin is fixed according to the invention (adjacent to the guide pin, preferably at a distance from it) in the yoke core base, in particular in an anti-rotation pin recess, it being particularly preferred to press the anti-rotation pin into it. wherein, in addition or as an alternative, welding and / or gluing can also be implemented. It is particularly expedient to design the anti-rotation pin recess as a through hole which is closed at the end on the side facing away from the anchor by the anti-rotation pin. The anti-rotation pin opening in the armature, into which the anti-rotation pin engages during the adjustment movement of the armature, in particular over its entire axial adjustment path, is also realized as a through opening for manufacturing reasons. The further provision of an anti-rotation pin enables the use of the electromagnetic actuating device in the context of actuating systems in which the armature is subjected to a torque which tends to rotate the armature about its adjusting axis, which preferably coincides with its longitudinal central axis. In particular, if the speeds involved are very high, as occurs, for example, when using the electromagnetic actuating device in connection with internal combustion engines and / or electric motors of motor vehicles, the absence of an anti-rotation device would lead to heavy loads and great wear on the actuating device. The realization of the anti-twist device as an anti-twist pin and the anchoring of the anti-twist pin in the one-piece yoke core element, more precisely in the yoke core bottom, leads to a practical, mass-production-capable and easily manufactured device.

As mentioned, it is particularly expedient if the yoke core bottom forms an axial stop (end stop) for the armature. Alternatively, the yoke core section can form a support surface for a stop damping element which, in a further development of the invention, can optionally be arranged in the interior space delimited by the yoke core element between the anchor end face and the yoke core base.

In an alternative embodiment, the yoke core bottom does not form an axial stop (end stop) for the armature, but this axial stop function is taken over by the guide pin in this alternative embodiment, which is then dimensioned in the axial direction so long that the armature immediately or preferably in an end stop position can be supported indirectly via a, preferably elastomeric, stop damping element on the guide pin. This stop damping element is preferably adjustable back and forth together with the armature and is preferably fixed to the armature for this purpose. This can be achieved, for example, in that the stop damping element is pressed into the guide opening for receiving the guide pin. The guide opening can be designed as a blind hole, it being advantageous if the stop damping element is supported axially on the bottom of the blind hole. In an alternative embodiment, in which the guide opening is not designed as a blind hole, but rather as a through opening closed at the end by a plunger section in a multi-part anchor design, which will be explained later, the stop damping element is preferably axially supported on an end face of the plunger section received in the through opening . Basically, regardless of the realization of the guide opening as a through opening, in particular closed by means of a tappet section, or as a blind hole closed at the end, it is additionally or alternatively possible to support the stop damping element axially on an annular shoulder or similar supporting surface of the guide opening.

In addition or as an alternative to a stop damping element arranged in the guide opening as described above, at least one stop damping element can be provided on the end face of the armature facing away from the guide pin recess in the yoke core bottom, preferably such a stop damping element on the armature is fixed, in particular pressed into an end opening, so that the armature can be supported via this stop damping element in an end stop position on the axial side facing away from the yoke core bottom, in particular on the housing side. The provision of stop damping elements on both axial sides of the armature leads to optimized noise minimization.

It is also possible, particularly in place of the provision of a stop damping element in the guide opening, to arrange a stop damping element adjacent to the guide opening, in particular fixed to the armature, in order to support the armature in an end stop position on the yoke core bottom side via the stop damping element on the yoke core bottom. A loose arrangement of a stop damping element between the anchor and a fixed component of the actuating device is also possible. It is also feasible to fix a stop damping element not to the anchor, but to a fixed component, in particular pressed into a component opening, in particular in the yoke core base.

An embodiment is particularly preferred in which the one-piece yoke core element is given additional functionality, namely in that it serves as a holder or axial securing device for an annular disk element which, in a development of the invention, is fixed in an inner circumferential groove of the yoke core element and which is penetrated by the armature .

According to a first alternative, the annular disk element can itself serve directly as an (immediate) end stop element axially opposite the yoke core base or alternatively as a carrier (immediate end stop element) for an optional damping element for damping the axial stop. It is particularly preferred if that Annular disk element in the aforementioned inner circumferential groove of the yoke core element is fixed by axial bracing, that is to say axially secured, which is realized in that the annular disk element can be elastically tensioned in the radial direction for insertion and then can be relaxed outward in the radial direction in order to radially into the inner circumferential groove of the yoke core element to snap inside radially outside. This functionality can be realized in particular in that the ring disk element in a further development of the invention is designed as a snap ring disk, namely from a material which preferably does not or poorly conducts the magnetic flux, very particularly preferably bronze. In the fixed position, according to a first alternative, the annular disk element can be accommodated in the annular groove in a relaxed manner or, alternatively, can be under a detent spring tension in the radial direction.

In particular, in a preferred embodiment of the actuating device, in which an axial anti-rotation pin is provided in addition to the axial guide pin, it is expedient if the armature in its, preferably plunger-shaped actuating section carries a roller bearing, preferably designed as a ball bearing (on which a component of the actuating partner is relative) to the non-rotatably arranged armature, preferably at high speeds, for example at more than 1000 rpm).

As already indicated at the beginning, in addition to a basically conceivable one-piece design of the armature, it is possible and preferred to form the armature in several parts, in which case it then preferably has a preferably sleeve-shaped guide section which has the guide opening, preferably in the form of a through-opening, on which a control section which has or adjusts the adjusting section forming, one-part or multi-part, preferably a smaller diameter than the guide section having plunger section, it being particularly expedient is when the plunger section is received in sections in the guide opening, for example by pressing.

It is particularly preferred if the yoke core element and the coil device, which at least partially encloses the yoke core element radially on the outside, are arranged in a common, flux-conducting housing, which is used for the return flow. The housing is preferably connected on the side axially opposite the core section via a yoke disk to the yoke section of the yoke core element, the yoke disk preferably securing the yoke core element axially in the housing.

The storage of the armature can be further optimized according to a preferred embodiment of the invention, in which the armature is supported on the guide pin via a slide bearing, this (inner) slide bearing preferably being arranged in the guide opening of the armature, in particular being pressed into this. This inner plain bearing is preferably axially spaced from the optional, but preferably provided, plain bearing (outer plain bearing) for guiding the armature on its outer circumference, this outer plain bearing preferably being, as mentioned, fixed, in particular pressed in, on the yoke core element, in particular on the inner circumference of the yoke core element .

The invention also leads to an actuating system comprising an electromagnetic actuating device designed according to the concept of the invention and an actuating partner which is preferably designed to introduce a torque about the adjusting axis into the armature, in particular via a roller bearing fixed to the armature.

Further advantages, features and details of the invention result from the following description of preferred exemplary embodiments and from the drawings.

Fig. 1

eine perspektivische Längsschnittansicht eines bevorzugten Ausführungsbeispiels einer nach dem Konzept der Erfindung ausgebildeten elektromagnetischen Stellvorrichtung,

Fig. 2

eine alternative bevorzugte Ausführungsform einer erfindungsgemäßen Stellvorrichtung mit axialem, in einer Führungsöffnung mit einem festgelegten Anschlagdämpfungselement sowie mit einem inneren Gleitlager, und

Fig. 3

eine weitere alternative, bevorzugte Ausführungsvariante mit auf beiden Axialseiten des Ankers vorgesehenen Anschlagdämpfungselementen.

These show in:

Fig. 1

2 shows a perspective longitudinal sectional view of a preferred exemplary embodiment of an electromagnetic adjusting device designed according to the concept of the invention,

Fig. 2

an alternative preferred embodiment of an adjusting device according to the invention with an axial, in a guide opening with a fixed stop damping element and with an inner slide bearing, and

Fig. 3

a further alternative, preferred embodiment variant with stop damping elements provided on both axial sides of the armature.

In the figures, the same elements and elements with the same function are identified by the same reference symbols.

In Fig. 1 an electromagnetic actuating device 1 designed according to the concept of the invention is shown; this comprises a two-part armature 2, which is arranged axially adjustable along an adjustment axis V within a one-part yoke core element 3, which is generally preferably designed as a rotationally symmetrical rotating part.

The yoke core element 3 comprises a core section 5, which has a yoke core base 4, for coupling the magnetic flux into the armature, and an essentially sleeve-shaped yoke section 6 extends parallel to the adjustment axis V and encloses the armature 2 radially outside the outer circumference.

In addition to the yoke core base 4, the core section 5 comprises a sleeve-shaped cone section 7, which forms an axial section of a reduced-thickness longitudinal section 8 between the core section 5 and the yoke section 6. It can be seen that a coil device 9 extends radially on the outside around the transition region 8.

In the specific exemplary embodiment, the adjusting device 1 is designed as a pulling device and the armature 2 has the function of a pulling armature, so that when the coil device 9 is energized, the armature 2 is adjusted along the adjusting axis V in the direction of the yoke core bottom. In the specific embodiment, this forms a direct axial end stop to limit the axial adjustment movement.

To reset the armature 2 in the opposite axial direction (adjusting direction), a return spring (not shown) is preferably provided, which can be supported on the face of the armature 2.

The yoke core element 3 is accommodated with the coil device 9 in a flux-conducting, preferably pot-shaped housing 10 and is axially secured in this by means of a yoke disk 11, which conforms radially to the outside of the yoke section 6, at the same time axially securing it and for magnetic flux guidance between the yoke section and the housing 10 care.

As mentioned at the outset, the armature 2 is formed in two parts and comprises a larger-diameter, sleeve-shaped guide section 12 which has a guide opening 13 in the form of a through-opening in which an end-side, designed as a plunger section of the armature 2 Adjustment section 14 is pressed. In its axial end region, the latter carries a roller bearing 15, only partially shown, on which an actuating partner can roll around the adjusting axis V in the circumferential direction. In order to prevent a drag torque caused thereby from rotating the armature 2 in the circumferential direction about the adjustment axis V, an anti-rotation pin 16 to be explained later is provided.

On the side facing away from the adjusting section 14, an axial guide pin 17 protrudes into the guide opening 13, which is fixed in a central guide pin recess 18 in the yoke core bottom 4 and is penetrated centrally by the adjusting axis V, as well as the central guide opening 13. The guide pin 17 is formed from a magnetically non-conductive material and serves to guide the armature 2 on the inner circumference of the guide opening 13.

The above-mentioned anti-rotation pin 16 is arranged at a radial distance from the guide pin 17 and is held in an eccentrically arranged anti-rotation pin recess 19 which is also designed as a through opening in the yoke core base 4 by pressing. The anti-rotation pin 16 engages in an anti-rotation pin opening 20 in the guide section of the armature 2, which is also designed as a through opening and extends parallel to the central guide opening 13 and thus prevents the armature 2 from rotating in the circumferential direction.

Parallel to the anti-rotation pin opening, an equalizing opening (through opening), which is dimensioned here by way of example, is provided in the guide section 12 of the armature 2 in order to compensate for pressure during an adjustment movement between those of the end faces of the guide section 12 limited cylinder spaces within the yoke core element 3 to be taken care of.

To guide the armature 2, more precisely the guide section 12, on its outer circumference, a slide bearing 21 is provided which is arranged on the inner circumference of the yoke section 6 of the yoke core element 3. The slide bearing 21 is axially secured by a step 23 formed on the inner circumference of the yoke core element 3, which step adjoins a circumferential bearing surface 24 for the slide bearing 21.

The guide section 12 of the armature 2 in the yoke core element 3 is axially secured by a non-magnetically conductive annular disk element 25 which engages radially outwardly in an inner circumferential groove 26 in the yoke section 6. A central opening 26 in the annular disk element 25 is penetrated by the plunger-shaped adjusting section 14 of the armature 2 - the guide section 12 of the armature 2 with its end face facing away from the yoke core base 4 can axially strike the annular disk 25 functioning according to the principle of a snap ring.

The yoke core element 3 of the actuating device 1 shown is the basis of a multifunctional assembly which carries the guide pin 17 fixed in the yoke core base 4 and the anti-rotation pin 16 also fixed in the yoke core base 4 and the slide bearing 21 for guiding the armature 2 on its outer circumference. In addition, the yoke core element 3 serves to clamp the ring disk through which the armature 2 passes, which limits the axial movement of the armature 2 on the axial side facing away from the yoke core base 4.

The very compact design according to the invention makes it possible to use the available installation space for increasing the magnetic performance.

Alternative design variants, likewise designed according to the concept of the invention, are described below, essentially based on the differences from the exemplary embodiment according to Fig. 1 is received. To avoid repetition, reference is made to the above description of the figures with regard to similarities.

The armature 2 of the electromagnetic actuator 1 according to Fig. 2 can be designed in one piece, for example. In this case, the guide opening 13 for receiving the guide pin 17 is preferably designed as a blind hole as shown. A stop damping element 29 is pressed into this, via which the armature 2 can be supported on the end face on the guide pin 17 in a lower end stop position in the plane of the drawing. In contrast to the exemplary embodiment described above, the yoke core base 4 does not form an end stop in the embodiment variant shown. This end stop functionality is taken over directly by the guide pin 17.

Another difference of the embodiment according to Fig. 2 consists in the provision of an inner plain bearing 30 (which also applies to the variant according to Fig. 1 can be provided), here, for example, in addition to the (outer) slide bearing 21. The inner slide bearing 30 is pressed into the guide opening 13, which is designed only as an example as a blind hole, and thus moves axially together with the armature 2 and guides this during the axial movement on the outer circumference of the centrally arranged guide pin 17th

In the alternative variant according to Fig. 3 In addition to the stop damping element 29 arranged in the guide opening 13, which is also designed as a blind hole opening, on the axial side of the armature 2 facing away from it or, in other words, on another axial side of the armature 2 facing away from the yoke core bottom 4, another stop damping element 31, here exemplarily ring-shaped, is arranged. This is pressed into an exemplary annular groove-shaped opening in an annular shoulder of the armature 2 and serves to dampen the armature stop in its upper stop position in the plane of the drawing, in which the armature 2 is axially supported on the annular disk element 25 via the annular stop damping element 31. Also in the variant according to Fig. 3 the inner slide bearing 30 is provided to guide the armature on the outer circumference of the guide pin 17.

It is expressly pointed out that the in the Figures 2 and 3rd Added features or functionalities can also be combined individually and in any combination with features of the other exemplary embodiments.

For example, the variant according to FIG Fig. 3 be carried out with an anti-rotation pin in order to rotate the armature 2, in particular in the case of the arrangement of a rolling bearing on the armature.

Reference numerals

1

electromagnetic actuator

2nd

anchor

3rd

Yoke core element

4th

Yoke core floor

5

Core section

6

Yoke section

7

Cone section

8th

Transition area

9

Coil device

10th

casing

11

Yoke plate

12th

Guide section

13

Guide opening

14

Control section

15

roller bearing

16

Anti-rotation pin

17th

Guide pin

18th

Lead pin recess

19th

Anti-rotation pin recess

20

Anti-rotation pin opening

21

bearings

23

step

24th

Contact surface

25th

Washer element

26

Inner circumferential groove

27

opening

28

Compensating hole

29

Stop damping element

30th

bearings

31

ring-shaped cushioning element

V

Adjustment axis

Claims (12)

1. An electromagnetic positioning device (1), in particular a pull device, having a stationary spool unit (9), having a moveably guided anchor (2), in particular a pull anchor, which forms a positioning section (14) and which can be axially displaced along a displacement axis (V) in response to supplying the spool unit (9) with current, as well as having a one-part cup-shaped yoke-core element (3), which receives the anchor (2) and which comprises a core section (5) as well as a yoke section (6) and which has a yoke-core bottom (4) extending perpendicular to the displacement axis (V) and a yoke-core sheath extending perpendicular to the yoke-core bottom (4) along the displacement axis (V), a longitudinally cut transition area (8) reduced in thickness and arranged between the core section (5) and the yoke section (6) being realized in the yoke-core sheath,
   a guide pin (17) for the anchor (2) being fixed, preferably pressed in, in a, preferably centric, guide pin recess (18) in the yoke-core bottom (4) and protruding axially into a, preferably centric, guide opening (13) of the anchor (2) and being displaceable relative to the anchor (2) during its displacement movement,
   characterized in that
   an anti-twist pin (16) extending parallel to the guide pin (17) is arranged adjacent to the guide pin (17) and is fixed, in particular pressed in, in an anti-twist pin recess (19) in the yoke-core bottom (4).
2. The electromagnetic positioning device (1) according to claim 1,
   characterized in that
   on the yoke-core element (3), in particular on the inner circumference of the yoke section (6), a sliding bearing (21) is fixed, preferably pressed in, for guiding the anchor (2) on its outer circumference.
3. The electromagnetic positioning device according to any one of the preceding claims,
   characterized in that
   the yoke-core bottom (4) forms an indirect or direct axial terminal abutment for the anchor (2) or a support surface for an abutment attenuation element.
4. The electromagnetic positioning device according to any one of the preceding claims,
   characterized in that
   the anchor (2) is axially arranged between the yoke-core bottom (4) and a washer element (25) penetrated by the anchor (2), said washer element (25) being fixed, in particular tensioned, in an inner circumferential groove (26) of the yoke-core element (3).
5. The electromagnetic positioning device according to claim 4,
   characterized in that
   the washer element (25) is realized as a spring lock washer, preferably from a material which does not conduct the magnetic flow, more preferably bronze.
6. The electromagnetic positioning device (1) according to any one of the preceding claims,
   characterized in that
   on the anchor (2), an abutment attenuation element is fixed, in particular pressed in, via which the anchor (2) is supported in at least one terminal abutment position on an immobile component, in particular the guide pin (17).
7. The electromagnetic positioning device according to any one of the preceding claims,
   characterized in that
   in its positioning section (14), the anchor (2) carries a rolling bearing (15) preferably realized as a ball bearing.
8. The electromagnetic positioning device according to any one of the preceding claims,
   characterized in that
   the anchor (2) is made of multiple parts and comprises a guide section (12), which comprises the guide opening (13), preferably realized as a through opening, and on which a push rod section, which comprises the positioning section (14) and which is made of one or multiple parts and preferably has a smaller diameter than the guide section (12), is fixed, in particular in the guide opening (13).
9. The electromagnetic positioning device according to any one of the preceding claims,
   characterized in that
   the spool unit (9) is supplied or can be supplied with current via a control in such a manner that the anchor (2) moves axially along the displacement axis towards the yoke-core bottom (4) upon supply with current.
10. The electromagnetic positioning device according to any one of the preceding claims,
    characterized in that
    the yoke-core element (3) and the spool unit (9) are arranged in a current-conductive casing (10).
11. A positioning system, comprising an electromagnetic positioning device (1) according to any one of the preceding claims as well as a positioning partner, which is preferably realized in the anchor (2) so as to introduce a torque around the displacement axis (V), in particular via a rolling bearing (15) fixed on the anchor (2).
12. The electromagnetic positioning device according to any one of the preceding claims,
    characterized in that
    an internal sliding bearing is arranged, in particular pressed in, on the anchor (2), in particular on the guide opening (13), in order to axially guide the anchor (2) on the outer circumference of the guide pin (17).

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