Electromagnetic Actuator

Abstract

The electromagnetic actuator includes a coil arrangement with at least one coil core and a coil arranged circumferentially around the coil core, a housing with a magnetic material and a rotationally symmetrical accommodation space in which the coil arrangement is at least partially accommodated, and a movable magnetic armature body as a movable actuator element movable by a magnetic field generated by the coil arrangement, the armature body being supported on one side by a bearing relative to the housing and movable along the bearing rotation axis from a first position to a second position, the armature body being configured in the shape of a disk and having a shape symmetrical transversely to the bearing rotation axis with respect to an axis of symmetry located in the plane of the disk, the armature body having a first maximum extension length between opposite ends of the armature body in the direction of the axis of symmetry and a second maximum extension length between opposite ends of the armature body in the direction of the axis of rotation of the bearing, the second maximum extension length being shorter than the first maximum extension length.

Description

[Technical field]

[0001] The present invention relates to an electromagnetic actuator having a coil arrangement with at least one coil core, a coil arranged circumferentially around the coil core, and a housing having a magnetic material, and a movable magnetic armature body as a movable actuator element, the armature body being movable by a magnetic field generated by the coil arrangement, the armature body being supported on one side relative to the housing by a support and being movable from a first position to a second position around a rotation axis of the support.

[0002] Such electromagnetic actuators are known, for example, in the form of electromagnetic switching or valve devices, for example in the form of electromagnetic relays or solenoid valves. Electromagnetic valves, for example in the form of tilting armature valves, are used, for example, as control valves for air pressure control in vehicles, for example in commercial vehicles or in buses for the transport of people, etc. For example, a brake system for a vehicle with an electronic service brake system contains at least one control valve for pressure control.

[0003] An electromagnetic actuator of the type mentioned at the outset is known, for example, in the form of a tilting armature valve from DE 10 2016 105 532 A1. The electromagnetic actuator has a coil arrangement and a moveable magnetic armature body.

[0004] Furthermore, further designs of solenoid valves are known, such as those described, for example, in DE 102014115207 A1, DE 102018123997 A1 or DE 102014115206 A1.

[0005] For example, when using cylindrical housings of the magnetic circuit, the armature body may be positioned eccentrically due to tolerances, which may result in large lateral forces acting laterally on the armature body, which may result in additional loads on the bearing points on which the armature body is supported and a smaller magnetic force in the working direction, which may on the one hand increase wear and on the other hand reduce efficiency.

[0006] The problem underlying the invention is to provide an electromagnetic actuator of the type mentioned at the outset, which allows for improved durability and greater efficiency.

[0007] The invention relates to an electromagnetic actuator of the type mentioned at the outset as set forth in the accompanying claims. Advantageous embodiments and developments of the invention are set forth in the dependent claims and the following description.

[0008] One aspect of the invention relates in particular to an electromagnetic actuator having a coil arrangement with at least one coil core, a coil arranged circumferentially around the coil core, and a housing with a magnetic material, a rotationally symmetrical accommodation space in which the coil arrangement is at least partially accommodated, and a movable magnetic armature body as a movable actuator element, which is movable by a magnetic field generated by the coil arrangement. The armature body is supported on one side by a bearing relative to the housing and is movable about the bearing rotation axis from a first position to a second position. The armature body is configured in the shape of a disk and has a shape symmetrical transversely to the bearing rotation axis with respect to an axis of symmetry located in the plane of the disk. The armature body has a first maximum extension length between opposite ends of the armature body in the direction of the axis of symmetry and a second maximum extension length between opposite ends of the armature body in the direction of the bearing rotation axis, which is shorter than the first maximum extension length.

[0009] The electromagnetic actuator according to the invention allows the armature body to be moved reliably and smoothly in the electromagnetic actuator, since the configuration of the armature body allows for a greater tolerance in the position of the armature body in the housing. In particular, on the one hand, more economical manufacturing procedures can be used when manufacturing the individual components, and on the other hand, the electromagnetic actuator, for example a solenoid valve for commercial vehicle applications, can be performed more robustly and more reliably with respect to wear of the armature bearing. Furthermore, the transverse forces of the magnetic field acting through the air gap can be reduced in undesirable directions and the magnetic field can be strengthened in the desired functional direction. Furthermore, the electromagnetic actuator according to the invention allows for a greater robustness with respect to manufacturing tolerances without negatively affecting the magnetic force and the manufacturing costs.

[0010] According to one embodiment of the electromagnetic actuator, the symmetry axis is arranged perpendicular to the bearing rotation axis, which allows the bearing reaction force of the armature body to be uniformly distributed with respect to the bearing rotation axis, which makes the load on the bearing more uniform, which allows the electromagnetic actuator to have improved durability.

[0011] According to one embodiment of the electromagnetic actuator, the first maximum extension is a first diameter of the armature body and the second maximum extension is a second diameter of the armature body. This configuration allows for a defined and relatively easy to fabricate armature body for improved positioning and reduced lateral forces, subject to tolerance conditions.

[0012] According to one embodiment of the electromagnetic actuator, the first maximum extension length is the maximum diameter of the armature body and the second maximum extension length is the minimum diameter of the armature body, which results in a rather elongated rounded, for example oval or elliptical, shape of the armature body, which improves, under tolerance conditions, the orientation of the armature body in the receiving space of the housing and the orientation of the magnetic field at the armature body acting on the armature body.

[0013] According to one embodiment of the electromagnetic actuator, the armature body has a convex, in particular elliptical, outer contour in the disk plane, which allows a sufficient air gap between the housing and the outer surface of the armature body at its periphery, even when the armature body is tilted transversely to the bearing rotation axis. This geometry of the armature body strengthens and favorably deflects the magnetic flux, so that the magnetic flux is strengthened at the longest lever arm and thus the magnetic force acting on the armature body is increased when the transverse force is reduced.

[0014] According to one embodiment of the electromagnetic actuator, the armature body has two opposite first regions in the direction of the symmetry axis, each with a rounded outer contour, and two opposite second regions in the direction of the bearing rotation axis, each with an outer contour that is flattened relative to the first regions, which again allows improved positioning of the armature body under tolerance conditions and a reduction of lateral forces.

[0015] According to one embodiment of the electromagnetic actuator, the two opposing first regions each have a circular outer contour, thus allowing a sufficiently constant gap between the armature body and the housing near the opposite ends of the bearing or armature body.

[0016] According to one embodiment of the electromagnetic actuator, the respective flattened outer contour is configured in a barrel shape, where barrel shape in particular means that the contour is flattened relative to a circular arc and may in particular have different radii, the central part of the flattened outer contour having a larger radius than the end parts of the flattened outer contour adjacent to the central part, the end parts of the flattened outer contour connecting the flattened outer contour to the respective circular outer contour, for example.

[0017] According to one embodiment of the electromagnetic actuator, the receiving space of the housing is configured cylindrically, which together with the armature body allows good positioning under tolerance conditions and simple manufacture.

[0018] According to one embodiment of the electromagnetic actuator, in the case of a symmetrical orientation of the armature body in the disk plane with respect to the receiving space of the housing, the air gap between the armature body at the position of the first maximum extension length and the adjacent part of the housing in the direction of the axis of symmetry is smaller than the air gap between the armature body at the position of the second maximum extension length and the corresponding adjacent part of the housing in the direction of the bearing rotation axis. Due to the air gaps of different widths, the magnetic flux is deflected positively, which strengthens the magnetic flux in the longest lever arm and thus the magnetic force in the armature body.

[0019] According to one embodiment of the electromagnetic actuator, the coil core has a rotationally symmetrical region with an axis of symmetry, which is surrounded by the coil in the circumferential direction, the support is arranged radially displaced with respect to the axis of symmetry of the coil core, and the armature body extends radially beyond the coil core. This allows a precise movement of the one-sidedly supported armature body, since the armature body can move to a large extent, and in particular completely, in the generated magnetic field. The positioning of the support allows an advantageous one-sided support of the armature body. In this way, a robust and reliable electromagnetic actuator can be produced under tolerance conditions and reduced lateral forces.

[0020] According to one embodiment of the electromagnetic actuator, the electromagnetic actuator is configured as an electromagnetic switching or valve device with an armature body as a switching or valve element, in particular as an electromechanical relay or solenoid valve.

[0021] According to one embodiment of the electromagnetic actuator, the electromagnetic actuator is configured as a tilting armature valve.

[0022] In one embodiment of the electromagnetic actuator, the electromagnetic actuator is configured as a solenoid valve for a pressure control module of a vehicle.

[0023] The embodiments described herein may be applied in parallel or in any combination with each other.

[0024] The invention is explained in more detail below on the basis of the figures shown in the drawing. [Brief description of the drawings]

[0025] [Figure 1A] 1 is a schematic cross-sectional view of an exemplary tilting armature valve in which an electromagnetic actuator according to the present invention may be used; [Figure 1B] FIG. 2 is another schematic cross-sectional view of an exemplary tilting armature valve in which the electromagnetic actuator of the present invention may be used. [Diagram 2] 2 is a perspective view of an exemplary known armature body for use in the exemplary tilting armature valve shown in FIG. 1; FIG. [Diagram 3] 2 is a schematic cross-sectional view of an armature body in a housing of one embodiment of an electromagnetic actuator according to the present invention, taken along a disk surface of the armature body in a position oriented in the housing. FIG. [Figure 4] FIG. 2 is a schematic cross-sectional view of an armature body in a housing of one embodiment of an electromagnetic actuator according to the present invention, taken along the disk surface of the armature body, the armature body being shown in a rotated position under tolerance conditions.

[0026] 1A and 1B show a simplified cross-sectional view of a tilting armature valve 100, in which an electromagnetic actuator 105 according to the invention with an armature body 115 as shown in Figs. 3 and 4 can be used in principle. Fig. 1 is intended to show an exemplary practical use of an electromagnetic actuator based on a tilting armature valve. In contrast, Fig. 2 shows an exemplary armature body 115 known from DE 102016105532 A1. On the basis of Fig. 2, the inventive configuration of the armature body 115 can be explained in a more understandable way. The inventive configuration of the armature body 115 is shown in more detail according to one embodiment in Figs. 3 and 4 and can be easily transferred by a person skilled in the art to the tilting armature valve shown in Fig. 1 in principle. In this connection it is pointed out that the basic manner of operation of electromagnetic devices, such as switching or valve devices, which have an armature body movable by a magnetic field as a switching or valve element, is known to those skilled in the art.

[0027] 1 to 4, the same components, components with the same functions, or components that correspond to each other are given the same reference numerals.

[0028] The tilting armature valve 100 can essentially be one embodiment of the tilting armature valve 100 shown in DE 102016105532 A1. In one variant, the tilting armature valve 100 can be the solenoid valve with reference number 100 in FIG. 1 of DE 102016105532 A1. However, other embodiments are also conceivable, for example in connection with solenoid valves as described in the other publications mentioned above. The respective embodiments of the solenoid valve described in DE 102016105532 A1, their components and their use are also part of the disclosure of the present invention by reference.

[0029] 1A shows a cross-sectional view of a tilting armature valve 100 with the armature body in a first position. The tilting armature valve 100 comprises a coil element 110, an armature body (or armature for short) 115, a spring 120, a sealing element 125, and a cover shell 130. The coil element 110, which comprises the main components coil, coil core and coil former, and is rotationally symmetrically configured, includes at least one cylindrical coil core 135 with an axis of symmetry 137, a coil former 128 arranged circumferentially around the coil core 135, and a coil 140 arranged circumferentially around the coil former 128 with a packet (not explicitly shown) of coil windings. The end faces of the armature 115 are supported by bearings 145 against a housing 170. The armature body 115 is movable between a first position 147 and a second position 149. The armature body 115 is configured to be moved from a first position 147 to a (sucked) second position 149 when the coil 140 is activated. When the coil 140 is activated, the armature body 115 can be held in the second position 149. A sealing element 125 is further arranged on the face of the armature 115 facing away from the coil element 110. The cover shell 130 is formed with a valve seat 150 with an outlet 155 for the fluid 158 and an inlet 157. When the armature 115 is arranged in the first position 147, the outlet 155 can be closed in a fluid-tight manner by the sealing element 125. Here, the sealing element 125 may further act as a damper element to prevent the armature 115 from impacting against the valve seat 150. The sealing element 125 may here be attached to the armature body 115 or to the support element by a rubber coating. It is further contemplated that an angle may be formed by an angled nozzle, or an angled shaped sealing element 125, or a curved armature 115, when the armature 115 or sealing element 125 impacts the valve seat 150. Such a nozzle, not explicitly shown in FIG. 1A, need not necessarily be incorporated into the tilting armature valve 100, but may be provided by an external housing portion.

[0030] It is further contemplated that the valve seat 150 is located on the coil element 110, although this is not explicitly shown in Figure 1A for the sake of clarity. In this case, an actuator that mediates the opening of the outlet by the armature body 115 would be advantageous.

[0031] The armature body 115 has at least one at least partially rounded ridge 160 on the bearing part 162 in this embodiment, which ridge 160 engages in a recess 165 or an opening, which is arranged, for example, in a part of the housing 170 or the coil former 128 of the tilting armature valve 100 facing the ridge 160. In this way, the armature body 115 can slide in the recess when moving from the first position 147 to the second position 149 after the current flow through the coil 140 is switched on, and at the same time is held in a fixed position in the housing 170 or against the cover shell 130. The recess is formed in a trapezoidal shape, which causes the smallest possible friction when the ridge slides over the upper surface of the recess 165. The recess 165 can be made of a plastic material, for example.

[0032] The spring 120 is configured as a leaf spring in this embodiment and is arranged in the bearing part on the side of the armature 115 opposite the coil 140. The spring 120 is used here to press, without play, a bearing ball, which is for example pressed into the armature body 115, into a (for example trapezoidal) counter shell or recess 165 in the housing 170 of the coil element 110. The armature body 115 can be fixed by the spring 120, so that the armature 115 is held in a predetermined position by the spring 120. This has the advantage that a constant preload force can be applied to the armature 115 and that the force applied by the spring 120 to the armature 115 can be applied to the armature body 115 as close as possible to the force application point which is located on the bearing rotation axis.

[0033] Alternatively, it is also possible to suspend the armature body 115 on the coil element 110. In this case, the spring 120, which is formed, for example, as a leaf spring, can be omitted.

[0034] 1B shows a cross-sectional view of the tilting armature valve 100 with the armature body 115 in the second position 149. In this case, the current through the coil 140 is switched on, attracting the armature body 115, thereby creating a magnetic field as shown by the magnetic field lines 180. When the current through the coil 140 is switched off, the armature body 115 is allowed to fall back to the first position 147, for example, due to gravity or the spring force of the return spring 195 as shown.

[0035] 2 shows a perspective view of an exemplary known armature body 115 for use in the tilting armature valve 100. The armature body 115 is configured here as a plate armature. Besides the sealing element 125, the armature body 115 has two balls pressed into it as bumps 160, 160a, which are arranged in a direction that forms the bearing rotation axis A of the armature body 115 during rotation after switching on the current through the coil 140. This means that the bumps 160, 160a are arranged at or along the bearing rotation axis A. The bumps 160, 160a form part of a support device for positioning the armature body 115 on the end face of the coil element 110. The armature body 115 is centrally configured with a spring mounting portion 196 which cooperates with the return spring 195 to prevent the return spring 195 from slipping off the armature body 115. Through the spring mounting portion 196, the return spring 195 can preload the armature body 115 towards a first position, which closes the valve when the coil 140 is not energized.

[0036] 3 shows a schematic cross-sectional view of the armature body 115 in a housing 170 along the disk surface of the armature body according to an embodiment of the electromagnetic actuator 105 according to the invention. The armature body 115 in FIG. 3 is arranged in a rotationally symmetric, in particular cylindrical, accommodation space 171 (of a housing 170 which is also preferably cylindrical), so that an annular gap is formed between the outer periphery of the armature body 115 and the inner side surface 172 of the housing 170. The armature body 115 is designed in the shape of a disk or a plate and has a symmetrical (here in particular axially symmetrical) shape with respect to a symmetry axis S located in the disk surface. Disk or plate-like in particular means that the armature body 115 has a thickness (perpendicular to the disk surface) that is smaller than the extension of the armature body 115 in the disk surface. The armature body 115 is supported on one side relative to the housing 170 by a bearing 145, as exemplarily described based on FIG. 1, and is movable between a first position 147 and a second position 149 along a bearing rotation axis A. The bearing 145 is arranged, for example, near an end of the armature body 115, in particular near the first end 116. The bearing rotation axis A is oriented transversely, in particular perpendicularly, to the axis of symmetry S and, like the axis of symmetry S, parallel to the disk plane. The bearing is exemplarily formed (for example in the form of a recess in the armature body, as shown in FIG. 3) by two bearing parts 161, 161a arranged and spaced apart along the bearing rotation axis A, which allow the armature body 115 to rotate around the bearing rotation axis A. The bearing portions 161 and 161a may be configured according to various aspects, for example as recesses or as ridges, for example as illustrated by ridges 160, 160a in Figure 2. Numerous bearing types are available.

[0037] The bearing parts 161 and 161a are arranged in a radially outer region of the armature body 115 with respect to the center point M, i.e., in this embodiment, the intersection of the center axis normal to the armature body 115 with the disk surface. This means that the bearing rotation axis A is likewise arranged in a radially outer region of the armature body 115. In the assembled state of the armature body 115, the center point M is arranged so as to be approximately aligned with the axis of symmetry 137 of the coil core 135. In the assembled state, the armature body 115 extends radially across the coil core 135 with respect to the axis of symmetry 137.

[0038] The armature body 115 is supported on one side relative to the housing 170, whereby a large portion of the armature body 115 forms a lever arm on which a magnetic force, generated by the magnetic field of the coil arrangement, can be applied in order to move the armature body 115 to the second position 149. The lever arm extends substantially from the bearing rotation axis A to a second end 117 of the armature body 115, which is arranged away from the bearing rotation axis A. Support on one side of the armature body means that the support is preferably arranged at the end of the armature body or in the area between the end and the central point.

[0039] The armature body 115 has a first maximum extension length D1 in the direction of the axis of symmetry S, i.e. in this embodiment between the first end 116 and the second end 117. The maximum extension length D1 in particular corresponds to a maximum diameter of the armature body 115. The armature body 115 further has a second maximum extension length D2 in the direction of the bearing rotation axis A between the third end 118 and the fourth end 119. The second maximum extension length D2 is shorter than the first maximum extension length D1. The second maximum extension length D2 in particular corresponds to a minimum diameter of the armature body 115.

[0040] In the armature body 115, the first maximum extension length D1 has a first, in particular maximum diameter, and the second maximum extension length D2 has a second, in particular minimum diameter. This means that the armature body 115 has a convex, in particular elliptical, outer contour. The armature body 115 has in particular a flat rounded convex outer contour in this embodiment in the disk plane. The armature body 115 has two mutually opposite first regions 115a in the direction of the symmetry axis S, each having a rounded (e.g. circular) outer contour K. The first end 116 and the second end 117 of the armature body 115 are located in the corresponding regions 115a. The armature body 115 has two mutually opposite second regions 115b in the direction of the bearing rotation axis A. The opposing second region 115b has a flatter or flattened outer contour F than the first region 115a.

[0041] The circular outer contour K in this embodiment has a radius r1, for example starting from the central axis of the armature body 115, which is slightly smaller than the inner radius of the housing accommodating space 171, so that a gap 191 remains between the first region 115a and the inner surface of the housing accommodating space 171.

[0042] In this embodiment, the barrel-shaped outer contour F has a radius r2 or r3 that is greater than the radius r1. With reference to Fig. 3, the measurement point P1 for the radius r2 is located between the central axis and the second region 115b on the right side. With reference to Fig. 3, the measurement point P2 for the radius r3 is located between the central axis and the second region 115b on the opposite side.

[0043] In the sense of the present disclosure, a barrel-shaped contour is particularly intended to include at least one contour or partial contour having a rounded or curved, in particular outwardly curved (convex), shape, in particular different from a circular arc shape. In this case, the exact barrel shape, for example in the mathematical sense, is not important, but the curved or rounded, in particular disc-shaped narrowing aspect, which differs from a circular arc shape, is more important, but which may have special advantages in terms of positioning under tolerance conditions. Thus, for example, elliptical, oval or other longitudinally rounded or curved contours are also to be included by this concept. It is also possible for the contour area to be provided with partially or locally straight contours located between the rounded contour areas.

[0044] The outer contour F is configured flatter than the outer contour K, so that when the armature body 115 is oriented symmetrically in the disk plane with respect to the receiving space 171 of the housing 170, the gap 191 in the direction of the axis of symmetry S between the armature body 115 at the position of the first maximum extension length D1 and the adjacent part of the housing 170 is smaller than the gap 192 in the direction of the support rotation axis A between the armature body 115 at the position of the second maximum extension length D2 and the adjacent part of the housing 170 thereto.

[0045] In Fig. 4, the armature body 115 is shown in a deflected, in particular pivoted, position under tolerance conditions, for example in the attracted second position 149 of Fig. 1, for example under the influence of a magnetic force. In Fig. 4, an exemplary position of the armature body 115 is shown, for example when a magnetic field is generated by a coil arrangement. Due to tolerances in the manufacture of the actuator and / or in the cutting of the components, it may happen that the armature body 115 is positioned eccentrically due to tolerances. This is due, for example, to tolerances in the bearing 145, tolerances in the molding of the armature body 115 and / or tolerances in the housing 170. This may cause relatively large lateral forces to be generated on the armature body 115 in the direction of the bearing rotation axis A, which thus additionally loads the bearing 145 and reduces the magnetic force in the working direction. Due to the inventive configuration of the armature body 115, even if the armature body 115 is pivoted in the direction of the bearing rotation axis and moves eccentrically towards a part of the housing 170, for example towards the left part of the housing 170 in Fig. 4, a reduced, preferably minimal, air gap 191 can be formed in the direction of the symmetry axis S. However, due to the still relatively small air gaps on both sides of the armature body 115 in the direction of the symmetry axis S, the magnetic flux continues to be deflected positively in the working direction, in particular towards the longest lever arm.

[0046] 4, the armature body 115 is not only radially displaced with respect to the axis of symmetry 137, but also rotated in the housing 170. This clearly shows that the armature body 115 can not only be displaced linearly by the magnetic field, but also rotated about the axis of symmetry 137 of the coil core 135. This means that the bearing parts 161 and 161a are not only loaded along the bearing rotation axis A, but also partially along the axis of symmetry S.

[0047] The gap between the armature and the housing can be reduced on both sides (in the direction of the axis of symmetry S), depending in particular on possible wear of the support as well as on the component tolerances. For example, depending on the manufacturing method, a rotation axis (axis of symmetry) is defined that stands perpendicular to the axis of rotation of the support, depending on the tolerances. Theoretically, the armature body can be rotated around this axis up to the maximum tolerance, and the outer contour of the armature can be formed with the defined minimum gap. This results in a round disk shape with lateral barrel-shaped flats relative to the original diameter. This results in greater robustness with respect to wear and manufacturing tolerances, without a significant negative impact on the magnetic force and manufacturing costs. [Explanation of symbols]

[0048] 100 Tilting armature valve 105 Electromagnetic Actuator 110 Coil element 115 Armature body 115a First Area 115b Second Area 116 First end 117 Second End 118 Third End 119 Fourth End 120 Spring 125 Sealing Element 128 Coil winding frame 130 Cover Shell 135 Coil Core 137 Axis of Symmetry 140 Coil 145 Supporting body 147 1st position 149 2nd position 150 Valve seat 155 Exit 157 Entrance 158 Fluid 160,160a ridge 161,161a Support part 162 Support part 165 Recess 170 Housing 171 Containment Space 172 Inner surface 180 Magnetic Field 191 void 192 void 195 Return spring 196 Spring mounting part A: Support body rotation axis D1 Extended length / diameter D2 Extended length / diameter F Flattened outer contour K Circular outer contour S Symmetry axis M center point P1 measurement point P2 measurement point r1 radius r2 radius r3 radius

Claims

1. An electromagnetic actuator (105), a coil device (135, 140) including at least one coil core (135) and a coil (140) circumferentially disposed around the coil core (135); a housing (170) comprising a magnetic material and a rotationally symmetrical accommodation space (171) in which the coil arrangement (135, 140) is at least partially accommodated; a movable magnetic armature body (115) as a movable actuator element movable by a magnetic field (180) generated by the coil device (135, 140), the armature body (115) being supported at one side relative to the housing (170) by a support (145) and movable from a first position (147) to a second position (149) around a support rotation axis (A); The armature body (115) is configured in the shape of a disk and has a shape that is symmetrical laterally with respect to the support rotation axis (A) with respect to an axis of symmetry (S) located in the plane of the disk, the armature body (115) having a first maximum extension length (D1) between opposite ends of the armature body (115) in the direction of the axis of symmetry (S) and a second maximum extension length (D2) between opposite ends of the armature body (115) in the direction of the support rotation axis (A), the second maximum extension length (D2) being shorter than the first maximum extension length (D1).

2. 2. The electromagnetic actuator (105) of claim 1, wherein the axis of symmetry (S) is oriented perpendicular to the bearing axis of rotation (A).

3. 3. The electromagnetic actuator (105) of claim 1 or claim 2, wherein the first maximum extension length is a first diameter (D1) of the armature body (115) and the second maximum extension length is a second diameter (D2) of the armature body (115).

4. 4. The electromagnetic actuator (105) according to claim 1, wherein the first maximum extension length is a maximum diameter (D1) of the armature body (115) and the second maximum extension length is a minimum diameter (D2) of the armature body (115).

5. 5. The electromagnetic actuator (105) according to any one of the preceding claims, wherein the armature body (115) has a convex, in particular elliptical, outer contour at the disk surface.

6. 6. The electromagnetic actuator (105) according to claim 1, wherein the armature body (115) has, in the direction of the axis of symmetry (S), two opposite first regions (115a), each having a rounded outer contour (K), and, in the direction of the bearing rotation axis (A), two opposite second regions (115b), each having an outer contour (F) that is flattened with respect to the first regions (115a).

7. 7. The electromagnetic actuator (105) of claim 6, wherein each of the two opposing first regions (115a) has a circular outer contour (K).

8. 8. An electromagnetic actuator (105) according to claim 6 or 7, characterized in that the respective flattened outer contour (F) is configured in the shape of a barrel.

9. 9. The electromagnetic actuator (105) according to claim 1, wherein the receiving space (171) of the housing (170) is cylindrically shaped.

10. 10. The electromagnetic actuator (105) according to claim 1, wherein, when the armature body (115) is oriented symmetrically in the disk plane with respect to the receiving space (171) of the housing (170), a gap (191) between the armature body (115) at the position of the first maximum extension length (D1) and an adjacent part of the housing (170) in the direction of the axis of symmetry (S) is smaller than a gap (192) between the armature body (115) at the position of the second maximum extension length (D2) and an adjacent part of the housing (170) in the direction of the support rotation axis (A).

11. The coil core (135) has a rotationally symmetrical area with an axis of symmetry (137) along which the coil core (135) is circumferentially surrounded by the coil (140); 11. The electromagnetic actuator (105) according to claim 1, wherein the support (145) is arranged radially displaced with respect to the axis of symmetry (137) of the coil core (135), and the armature body (115) extends radially beyond the coil core (135).

12. The electromagnetic actuator (105) according to any one of claims 1 to 11, wherein the electromagnetic actuator (105) is configured as an electromagnetic switching device or valve device (100) with the armature body (115) as a switching element or valve element, in particular as an electromechanical relay or solenoid valve (100).

13. 13. The electromagnetic actuator (105) according to any one of claims 1 to 12, wherein the electromagnetic actuator is configured as a tilting armature valve (100).

14. 14. The electromagnetic actuator (105) according to any one of claims 1 to 13, wherein the electromagnetic actuator (105) is configured as a solenoid valve (100) for a pressure control module of a vehicle.

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