Electromagnetic actuators, in particular electromagnetic switching devices or valve devices

Abstract

The electromagnetic actuator (105) includes a coil element (110) having at least one coil core (135) and a coil (140) arranged circumferentially around the coil core (135), the coil core (135) having a rotationally symmetric first region (136) with an axis of symmetry (137), the first region (136) in which the coil core (135) is surrounded by the coil (140) in the circumferential direction, and an armature body (115) that cooperates with the coil element (110) for movement to actuate the armature body (115) and is actuated by a bearing device (106) on one side. and a movable magnetic armature body (115) as a movable actuator element supported on the motor (105) and movable from a first position (147) to a second position (149) by actuating the coil element (110), the support device (106) being arranged radially displaced with respect to a symmetry axis (137) of the coil core (135), the armature body (115) extending radially from the support device (106) through the coil core (135) from a first side (131) to a second side (132) of the coil core (135). The coil core (135) has a second region (138) that extends radially beyond the first region (136) and is disposed between the coil (140) and the armature body (115) in the direction of the axis of symmetry (137) on a second side (132) of the coil core (135), such that at a first position (147) of the armature body (115), a gap (190) between the coil core (135) and the armature body (115) in the direction of the axis of symmetry (137) is smaller on the second side (132) of the coil core than on the first side (131).

Description

[Technical field]

[0001] The present invention relates to an electromagnetic actuator comprising a coil element having a coil core and a coil radially arranged around the coil core, and a movable magnetic armature body as an actuator element, the actuator element cooperating with the coil element for movement to actuate the armature body and supported on one side by a bearing device on the actuator, the electromagnetic actuator being movable from a first position to a second position by actuating the coil element.

[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 armatures, are used, for example, as control valves for air pressure control in vehicles, for example in commercial vehicles or in buses for passenger transport. 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 in the form of a tilting armature valve is known, for example, from DE 10 2016105532 A1. The tilting armature valve has a coil element with a coil core, a coil arranged circumferentially around the coil core, and an armature supported by a support at an end face of the armature, the armature being movable from a first position to a second position, in particular by applying an electric current to the coil. Furthermore, a valve seat is provided with an outlet and an inlet for the fluid, the outlet being fluid-tightly closable by a sealing element in the first position of the armature and the outlet being open in the second position of the armature. According to one embodiment, a spring is provided for pressing the armature against the coil element or against the housing of the tilting armature valve.

[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] In electromagnetic actuators, particularly in switching or valve devices, such as the exemplary solenoid valve configurations, the solenoid coil and the magnetic core (coil core), which reinforces the magnetic force, are generally designed, for example, round or cylindrical in cross section due to a positive material / surface ratio. This ensures a uniform distribution of the magnetic flux in the magnetic core. However, the known coil core shapes often lead to an uneven flow of the magnetic flux from the core to the yoke. However, when used in yoke armature magnets (e.g. tilting armature magnets), this means that part of the magnetic force acting also acts in the region of the support of the tilting armature, or even behind the support rotation axis. This reduces or even weakens the effective magnetic force.

[0006] SUMMARY OF THE DISCLOSURE The object of the invention is to provide an electromagnetic actuator of the type mentioned at the outset, which makes it possible to increase the magnetic force available for the actuating movement of the actuator element.

[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 with a coil element, the coil element having at least one coil core and a coil arranged circumferentially around the coil core, the coil core having a rotationally symmetric first region with an axis of symmetry, the first region being circumferentially surrounded by the coil, the actuator further comprising as a movable actuator element a movable magnetic armature body, the movable magnetic armature body cooperating with the coil element for a movement to actuate the actuator body, supported on one side by a bearing device on the actuator and movable from a first position to a second position by actuating the coil element, the bearing device being arranged radially displaced with respect to the axis of symmetry of the coil core, the armature body extending from the bearing device radially through the coil core from the first side to the second side of the coil core. The coil core further has a second region extending radially beyond the first region and disposed on a second side of the coil core between the coil and the armature body in the direction of the axis of symmetry, such that in the first position of the armature body, the gap between the coil core and the armature body in the direction of the axis of symmetry is smaller on the second side of the coil element than on the first side.

[0009] The invention makes it possible to increase the magnetic force available for the movement of actuating the actuator element in an electromagnetic actuator of the type mentioned at the beginning, by positioning and configuring the magnetic path between the coil core and the armature body (yoke) in a targeted manner, in that on the one hand the magnetic flux in the direction of the bearing is weakened, while on the other hand the magnetic force available at the end of the armature body is increased, which also has a positive effect on the torque acting on the armature body by the magnetic force, which is increased on the second side of the coil core, remote from the bearing.

[0010] Due to this intended positioning and configuration of the magnetic course between the coil core and the armature body, the one-sided supported yoke armature magnet can basically be used in all electromagnetic actuators, for example in connection with tilting armature magnetic valve devices and switching devices, etc. This allows the optimization of electromagnetic actuators, for example with yoke armature magnets (e.g. tilting armature magnets) as drivers for relays, stroke armatures and solenoid valves.

[0011] According to one embodiment of the electromagnetic actuator, the second region of the coil core extends in a step-like manner starting from the first region, as viewed in a cross section along the axis of symmetry of the coil core. The geometry of the end face of the coil core in the second region is provided with an additional step, preferably with the maximum possible diameter up to the circumference of the coil winding. By means of such an additional step, the magnetic field lines are strengthened and deflected towards the second side of the coil core. As a result, on the one hand, the torque acting on the armature body is increased at this point, and on the other hand, the load on the bearing is relieved by a part of the generated magnetic force. Advantageously, the coil core in the second region, for example by means of an additional step, covers more than half the radial extension of the coil winding arranged circumferentially around the coil core.

[0012] The coil core is in particular designed in such a way that in the second region, the surface centre of gravity of the coil core is displaced in a direction away from the bearing device relative to the axis of symmetry.

[0013] According to one embodiment, the bearing device is arranged radially outside the coil core.

[0014] In one embodiment of the electromagnetic actuator, the armature body is specified to have a first region, where the armature body is supported on the actuator by a bearing device, and a second region extending over a second region of the coil core, the armature body having an increased reluctance per unit length in the first region compared to the reluctance per unit length in the second region of the armature body, whereby by increasing the reluctance in the first region of the armature body, where the bearing is located, the magnetic flux in the direction of the bearing can be additionally weakened, which can further reduce the load at the bearing.

[0015] According to one embodiment, it is specified that the armature body has at least one cross-sectional narrowing in a first region, which is narrowed compared to the cross-section in a second region of the armature body. The armature body in particular has at least one cross-sectional narrowing in the first region, on the side of the second region of the armature body, which is narrowed compared to the cross-section of the armature body material adjacent to the cross-sectional narrowing. In this way, the magnetic resistance can be increased by relatively simple manufacturing technical measures.

[0016] According to one embodiment, the at least one cross-sectional narrowing has a thickness of the armature body that is reduced compared to the thickness of the armature body in the second region.

[0017] In particular according to one embodiment, the at least one cross-sectional narrowing is created by one or more reductions in the armature body material in the first region.

[0018] For example, the at least one cross-sectional narrowing is created by notching, embossing and / or stamping the armature body material in the first region.

[0019] According to one embodiment, at least one cross-sectional narrowing is located on the bearing body rotation axis of the bearing device and / or adjacent to the bearing body rotation axis of the bearing device. For example, a notch is provided in the region of the bearing body rotation axis. Additionally or alternatively, the targeted reduction of the armature material (yoke), preferably in the region of the bearing body, can be achieved by embossing, punching or cutting.

[0020] According to one embodiment, the armature body is configured as a plate armature. The armature body is advantageously configured as a tilting armature.

[0021] According to one embodiment, the electromagnetic actuator is configured as an electromagnetic switching or valve device and the movable armature body is configured as a switching or valve element.

[0022] In particular, the electromagnetic actuator is configured as an electromechanical relay or as a solenoid valve, in particular a tilting armature valve.

[0023] In one embodiment, the electromagnetic actuator is configured as a solenoid valve for a pressure control module of a vehicle.

[0024] The embodiments described herein can be applied in parallel or in any combination with each other.

[0025] The invention is explained in more detail below on the basis of the figures shown in the drawing. [Brief description of the drawings]

[0026] [Figure 1A] 3 shows a schematic cross-sectional view of an exemplary tilting armature valve in which an electromagnetic actuator according to the present invention, as shown in FIG. 2, may be used according to a basic scheme. [Figure 1B]3 shows another schematic cross-sectional view of an exemplary tilting armature valve in which an electromagnetic actuator according to the present invention, as shown in FIG. 2, may be used according to a basic scheme. [Diagram 2] 2 shows a schematic cross-sectional view of one embodiment of an electromagnetic actuator according to the present invention, such as may be used in the tilting armature valve shown in FIG. 1;

[0027] FIG. 1 shows a simplified cross-sectional view of a tilting armature valve 100 according to an embodiment, in which the electromagnetic actuator according to the invention, as shown in FIG. 2, can be used according to a basic scheme, based on FIGS. 1A and 1B. FIG. 1 shows an exemplary practical use of an electromagnetic actuator based on a tilting armature valve. The inventive arrangement of the coil core, the armature body and other components is shown in detail according to an embodiment in FIG. 2 and can be basically easily transferred by a person skilled in the art to the tilting armature valve shown in FIG. 1. In this connection, it is pointed out that the basic operation of an electromagnetic actuator, for example a switching device or a valve device with an armature body movable by a magnetic field as a switching element or valve element, is known to a person skilled in the art.

[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 embodiment, the tilting armature valve 100 can be the solenoid valve with reference number 100 in FIG. 1 of the abovementioned specification. However, other embodiments are also conceivable, for example in connection with solenoid valves as described in the other publications mentioned above. The corresponding 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 according to one embodiment with the armature in a first position. The tilting armature valve 100 includes 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 includes at least one coil core 135 and a coil 140 circumferentially disposed around the coil core 135, the coil 140 comprising a packet of coil windings (not explicitly shown). An end face of the armature 115 is supported by a support 145. The armature 115 is movable between a first position 147 and a second position 149. Here, the armature 115 is configured to be moved from the first position 147 to the second position 149 (attracted) upon actuation of the coil 140. When the coil 140 is actuated, the armature 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 and an inlet 157 for a fluid 158. Here, 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 can further act as a damper element to prevent the impact of the armature 115 on the valve seat 150. The sealing element 125 can be attached to the armature 115 or to the support element by a rubber coating. It is further conceivable that an angle is formed by an oblique nozzle, or an obliquely shaped sealing element 125, or a curved armature 115, when the armature 115 or the sealing element 125 impacts on the valve seat 150. Such nozzles, not explicitly shown in FIG. 1A, need not necessarily be integrated into the tilting armature valve 100, but may be provided from an external housing portion.

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

[0031] The armature 115 has at least one protuberance 160, which in this embodiment is at least partially rounded, on the bearing part 162, which advantageously engages in a recess 165 or an opening arranged in a part of the housing 170 of the tilting armature valve 100 facing the protuberance 160. This allows the armature 115 in the recess to slide 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 preferably formed trapezoidally, so that the smallest possible friction occurs when the protuberance slides over the upper surface of the recess 165. The recess 165 can be made, for example, from a plastic material, which allows it to be produced very simply and inexpensively.

[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 115, into a (for example trapezoidal) counter shell or recess 165 in the housing 170 of the coil element 110. The armature 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 can be applied to the armature 115 and that the force exerted by the spring 120 on the armature 115 can be exerted on the armature 115 as close as possible to the force application point located on the axis of rotation.

[0033] Alternatively, it is also possible to suspend the armature 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 115 in the second position 149. In this case, the current through the coil 140 is switched on, attracting the armature 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 115 is allowed to fall back to the first position 147, for example, due to gravity or the spring force of the return spring as shown.

[0035] However, the cylindrically shaped core shape of the coil core 135 as shown in Fig. 1 causes the course of the magnetic flux (illustrated by the magnetic field lines 180 as an example) to extend non-uniformly from the core to the yoke. However, when used in a yoke armature magnet or a tilting armature magnet as shown in Fig. 1, this means that a significant part of the acting magnetic force also acts in the area of ​​the bearing part 162 of the armature 115. This reduces or even weakens the effective magnetic force on the side of the sealing element 125 and also applies additional magnetic forces to the bearing part 162, which is undesirable in many constructional forms of the actuator.

[0036] Figure 2 shows a schematic cross-sectional view of one embodiment of an electromagnetic actuator according to the invention, which can be used, for example, in the tilting armature valve shown in Figure 1. In Figures 1 and 2, identical, functionally identical or similar components are provided with the same reference numbers.

[0037] In contrast to the tilting armature valve 100 according to Fig. 1, the electromagnetic actuator 105 shown in Fig. 2 comprises a coil element 110 in which a coil core 135 has a rotationally symmetric first region 136 with an axis of symmetry 137, in which the coil core 135 is circumferentially surrounded by a coil 140, and a second region 138 extending radially beyond the first region 136, i.e. on at least one side of the coil core 135, with a radial extension that exceeds the radial extension of the first region 136. Thus, in the first region 136, the coil core is configured, for example, cylindrically around the axis of symmetry 137, similar to the coil core 135 shown in Fig. 1, whereas in the second region 138 this is not the case.

[0038] 1, a second region 138 of the coil core 135, which is asymmetric with respect to the axis of symmetry 137, is additionally provided according to the invention in order to asymmetrically influence the magnetic field. In particular, when viewed in a cross section along the axis of symmetry 137 of the coil core 135, the second region 138 of the coil core 135 is formed step-like, starting from the first region 136, in a substantially rotationally symmetric (cylindrical) half of the region 136. The second region 138 here, when viewed in plan, can be configured rectangular or partly rounded, for example semicircular, or can be configured with another geometric shape, for example with a geometric shape (for example semicircular) that corresponds to the geometric shape of the armature 115 (for example rounded or semicircular in the region 117) when viewed in plan. Therefore, on the side of the coil core 135 in the second region 138, which is remote from the armature support, an additional step is provided which differs from the cylindrical shape of the first region 136, and which advantageously extends to the maximum possible diameter up to or close to the outer periphery of the coil winding 141.

[0039] The armature 115 is supported on one side in the actuator 105 by a bearing device 106. In this embodiment, the bearing device 106 is arranged radially displaced with respect to the axis of symmetry 137 of the coil core 135 and is fixed to the actuator 105, preferably radially outside the coil core 135 or outside the outer circumference of the coil core 135, around the coil element 110. The armature 115 here extends radially from the bearing device 106 via the coil core 135 from a first side 131 to a second side 132 of the coil core 135. The second side 132 is located radially opposite to the first side 131.

[0040] By actuating the coil element 110 (current flow in the coil 140), as described with reference to FIG. 1, the armature 115 is moved from a first position 147 (which may be horizontal or leaned slightly at an angle as shown in FIG. 1A) to an attracted second position (similar position 149 in FIG. 1B, not shown in FIG. 2), and thus is attracted downwardly to the coil 140.

[0041] A second region 138 of the coil core 135, which extends radially and asymmetrically beyond the first region 136, is arranged between the coil 140 and the armature 115 on the second side 132 of the coil core 135, as viewed in the direction of the symmetry axis 137. This results in an air gap 190 being formed between the coil core 135 and the armature 115 in the direction of the symmetry axis 137 (and thus in the longitudinal direction of the coil core 135), which air gap 190 is configured asymmetrically between the first side 131 and the second side 132 of the coil core 135. In particular, at the first position 147 of the armature 115, the air gap 190 between the coil core 135 and the armature 115 in the direction of the symmetry axis 137 is smaller on the second side 132 of the coil core than on the first side 131. This results in a smaller magnetic resistance (Rm) for the magnetic field lines 180 on the second side 132 compared to the first side 131. Rm=Rm, iron + Rm, air It is.

[0042] "Iron" is used herein to encompass the armature material and the materials of the coil core 135 and housing 170. These components may be constructed from the same or different magnetically conductive materials.

[0043] Because magnetic resistance Rm is proportional to the length that the magnetic field lines 180 must penetrate, Rm, air, on the second side 132 is much smaller than on the first side 131 where the air gap 190 is much larger in comparison, due to the step in the coil core 135 in the second region 138 and the resulting reduced air gap 190.

[0044] Such an additional step in the second region 138 thus intensifies and deflects the magnetic field lines 180 in the direction of the second side 132 of the coil core 135, so that on the one hand the torque acting on the armature 115 is increased at this point and on the other hand the load on the bearing device 106 is relieved by part of the generated magnetic force. Advantageously, more than half of the radial extension of the coil winding 141 arranged circumferentially around the coil core 135 is covered by the coil core 135 in the second region 138, i.e. by the additional step shown. In principle, the additional step or head of the coil core 135 can be configured in the second region 138 up to or close to the housing 170. However, even a shorter radial extension of the step penetrating into the radial region of the coil winding 141 can already improve the magnetic field line distribution. Advantageously, the coil core 135 is configured in such a way that in the second region 138 the surface centre of gravity of the coil core 135 is displaced in the opposite direction to the bearing device 106 with respect to the axis of symmetry 137 .

[0045] Thus, according to the invention, it is possible, on the one hand, to increase the magnetic force available for the movement of actuating the armature 115 by configuring the magnetic course between the coil core 135 and the armature 115 in such a way that the magnetic flux in the direction of the bearing device 106 is weakened by the larger air gap 190, whereas the magnetic force available on the opposite side of the armature 115 is increased. This also has a positive effect on the torque acting on the armature 115 by the magnetic force, which is now increased on the second side 132 of the coil core 135, which is remote from the bearing device 106, since the magnetic field lines 180, and thus the center of force, are displaced to a larger radius of the armature 115 in the direction of the second side 132. This also has the positive effect that the magnetic force acting additionally on the bearing device 106 is reduced.

[0046] The displacement of the magnetic field lines 180 in the direction of the second side 132 of the coil core 135 can be enhanced by the armature 115 having an increased magnetic resistance per unit length in the first region 116 compared to the magnetic resistance per unit length in the second region 117 of the armature 115. In the first region 116, the armature 115 is supported by the bearing device 106 on the actuator 105, and in the second region 117, the armature 115 extends over the second region 138 of the coil core 135. The magnetic resistance per unit length in the vicinity of the bearing is therefore higher than in the step region of the coil core 135. This also allows the magnetic field lines 180 in the direction of the second side 132 to be displaced to a larger radius of the armature 115.

[0047] The reluctance per unit of length can be increased by providing at least one narrow cross-sectional area 118 in the first region 116 of the armature 115, which is narrower than the cross-sectional area in the second region 117 of the armature 115. Since the reluctance Rm is inversely proportional to the cross-sectional area of ​​the armature material through which the magnetic field lines 180 must pass, the narrow cross-sectional area 118 makes the Rm,ir per unit of length in the first region 116 of the armature 115 higher than in the second region 117. Furthermore, by displacing the narrow cross-sectional area 118 as shown in FIG. 2, the curvature thus created can lengthen the path that the magnetic field lines 180 must travel, which also increases the reluctance proportional to the length they must travel.

[0048] As shown in FIG. 2, at the cross-sectional narrowing 118 the cross-section of each of the armatures 115 is reduced compared to the cross-section of the armature body material adjacent to the cross-sectional narrowing 118 on the side of the second region 117 .

[0049] In the embodiment according to FIG. 2, the cross-sectional narrowing 118 has a smaller thickness d1 of the armature 115 (in the direction of the axis of symmetry 137) compared to a thickness d2 in the second region 117 of the armature 115.

[0050] The cross-sectional narrowing 118 can be made by a reduction (indicated by reference number 119 in FIG. 2) of the armature body material in the first region 116. The reduction 119 (e.g. in the form of a hollow, recess or indentation) is made, for example, by notching, embossing and / or stamping the armature body material. As shown in FIG. 2, the cross-sectional narrowing 118 is advantageously located on and / or adjacent to the bearing axis of rotation of the bearing device 106.

[0051] By means of a targeted positioning and configuration of the magnetic path between the core and the armature (yoke), the magnetic flux is advantageously attenuated in the direction of the bearing, which in turn increases the available magnetic force and, with the resulting lower bearing friction, reduces the bearing reaction force.

[0052] In the illustrated embodiment, the armature 115 is formed as a plate-type armature, as in the embodiment according to FIG. 1, for example as used in the tilting armature valve 100 shown in FIG. 1. The armature 115 is supported on one side, in this example at an end face, by a bearing device 106 fixedly on an actuator 105, for example the tilting armature valve 100, and is moved between a first position and a second position by the actuation of the coil 140, as explained with reference to FIG. 1. The bearing device 106, with its bearing rotation axis perpendicular to the axis of symmetry 137 of the coil core 135, is shown in FIG. 2 differently from the bearing part 162 and the bearing 145 in FIG. 1, and is intended only to show the one-sided bearing of the armature 115 in a schematic manner. For the bearing, various mechanisms can be used, for example the mechanism of FIG. 1 or other mechanisms from the publications mentioned above.

[0053] The actuator 105 shown in Fig. 2 has been described in the general description of Fig. 1 in connection with a solenoid valve in the form of a tilting armature valve 100. In contrast, when used in an electromagnetic switching device, for example in a relay, the armature 115 shown in Fig. 2 can be used, for example, as an electrical switching element which closes or opens an electrical contact analogous to a valve opening. The described scheme of magnetic field relocation by the configuration of the coil core 135 and the armature 115 can in principle be used in all solenoid armature valve devices and switching devices described in the generic sense. [Explanation of symbols]

[0054] 100 Tilting armature valve 105 Electromagnetic Actuator 106 Bearing device 110 Coil element 115 Armature body 116 First Area 117 The Second Region 118 Narrow cross section 119 Decreasing part 120 Spring 125 Sealing Element 130 Housing part 131 First Side 132 Second Side 135 Coil Core 136 First Area 137 Axis of Symmetry 138 Second Area 140 Coil 141 Coil Winding 145 Supporting body 147 1st position 149 2nd position 150 Valve seat 155 Exit 157 Entrance 158 Fluid 160 Ridge 162 Support part 165 Recess 170 Housing 180 Magnetic Field Lines

Claims

1. An electromagnetic actuator (105), The present invention relates to a coil element (110) having at least one coil core (135) and a coil (140) arranged circumferentially around the coil core (135), the coil core (135) having a rotationally symmetric first region (136) with an axis of symmetry (137), the first region (136) being surrounded by the coil (140) in the circumferential direction of the coil core (135); a movable magnetic armature body (115) as a movable actuator element, which cooperates with the coil element (110) for movement to actuate the armature body (115), is supported on one side of the actuator (105) by a bearing device (106), and is movable from a first position (147) to a second position (149) by actuating the coil element (110), the bearing device (106) being arranged radially displaced with respect to the axis of symmetry (137) of the coil core (135), the armature body (115) extending radially from the bearing device (106) through the coil core (135) from a first side (131) to a second side (132) of the coil core (135), 1. An electromagnetic actuator comprising: a coil core having a second region extending radially beyond the first region and disposed on the second side of the coil core in the direction of the axis of symmetry between the coil and the armature body, such that at the first position of the armature body, an air gap between the coil core and the armature body in the direction of the axis of symmetry is smaller on the second side of the coil core than on the first side.

2. 2. The electromagnetic actuator according to claim 1, wherein, when viewed in a cross section along the axis of symmetry of the coil core, the second region of the coil core extends in a stepped manner starting from the first region.

3. 3. The electromagnetic actuator according to claim 1, wherein the bearing device (106) is arranged radially outside the coil core (135).

4. 4. The electromagnetic actuator according to claim 1, wherein the coil (140) has a coil winding (141) arranged circumferentially around the coil core (135), and the coil core (135) is configured such that in the second region (138), the surface center of gravity of the coil core (135) is displaced in a direction opposite to the support device (106) with respect to the axis of symmetry (137).

5. the armature body (115) has a first region (116) where the armature body (115) is supported on the actuator by the support device (106) and a second region (117) extending over the second region (138) of the coil core (135); 5. The electromagnetic actuator according to claim 1, wherein the armature body (115) has an increased reluctance per unit length in the first region (116) compared to a reluctance per unit length in the second region (117) of the armature body (115).

6. 6. The electromagnetic actuator of claim 5, wherein the armature body (115) has at least one cross-sectional narrowing (118) in the first region (116) that is narrower than a cross-section of the second region (117) of the armature body (115).

7. 6. The electromagnetic actuator of claim 5, wherein the armature body (115) has at least one cross-sectional narrowing (118) in the first region (116) that is narrower than a cross-section of the armature body material adjacent the cross-sectional narrowing (118) on the side of the armature body (115) on the second region (117).

8. 8. The electromagnetic actuator according to claim 6 or 7, wherein at least one of the cross-sectional narrowings (118) has a thickness (d1) of the armature body (115) that is reduced compared to a thickness (d2) of the armature body (115) in the second region (117).

9. 9. An electromagnetic actuator according to any one of claims 6 to 8, wherein at least one said cross-sectional narrowing (118) is created by a reduction (119) of armature body material in said first region (116).

10. 10. The electromagnetic actuator according to claim 6, wherein at least one of the cross-sectional narrowings (118) is produced by notching, embossing and / or stamping (119) of the armature body material in the first region (116).

11. 11. The electromagnetic actuator according to claim 6, wherein at least one of the cross-sectional narrowings (118) is located on and / or adjacent to a bearing rotation axis of the bearing device (106).

12. Electromagnetic actuator according to any one of claims 1 to 11, wherein the armature body (115) is configured as a plate armature.

13. Electromagnetic actuator according to any one of claims 1 to 12, characterized in that the armature body (115) is configured as a tilting armature.

14. 14. The electromagnetic actuator according to claim 1, wherein the electromagnetic actuator is configured as an electromagnetic switching device or valve device (100), and the movable armature body (115) is configured as a switching element or a valve element.

15. 15. The electromagnetic actuator of claim 14, configured as an electromechanical relay or solenoid valve (100).

16. 16. The electromagnetic actuator of claim 15, configured as a solenoid valve (100) for a pressure control module of a vehicle.

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