Holding device for electromagnetic coil in actuator

Abstract

The invention relates to an actuator (12) having an electromagnetic coil (30). The invention relates in particular to a holding device (10) for an actuator (12) having a solenoid coil (30) and a method for assembling a solenoid coil (30).

Description

TECHNICAL FIELD

[0001] The present invention relates to an actuator with an electromagnetic coil. In particular, the present invention relates to a holding fixture for an electromagnetic coil and a method for assembling an electromagnetic coil. BACKGROUND

[0002] In modern motor vehicles, electromechanical wheel brakes ("EMB") are increasingly used, for example as service brakes. Such wheel brakes have certain advantages over conventional hydraulically actuated wheel brakes. They no longer require a complex hydraulic system and are also significantly more space-saving.

[0003] Such electromechanical wheel brakes typically comprise at least one electric or electronic drive unit which works in conjunction with a mechanical or transmission mechanism. On the output side, a brake unit can then be arranged which can comprise a brake piston with friction linings which can be pressed against a brake disc or brake drum by means of a translational movement. A desired deceleration or braking effect can thus be achieved in operation.

[0004] Electromechanical wheel brakes can comprise an electronic control device which uses electric actuators. These actuators are usually composed of different components and members.

[0005] In order to achieve a cost-effective production, automation or semi-automation of the production is usually required. Here, different positioning and position tolerances between the individual members can cause problems and thus make automated production difficult.

[0006] For certain components, such as electromagnetic coils, which can interact with another member, such as the armature of a valve, it is very important to maintain a predetermined position of these members relative to each other with precise orientation. At the same time, it is also very important to precisely orient these members also relative to other components, for example in order to be able to establish an electrical contact to a circuit board.

[0007] In the assembly of electromagnetic coils with armatures, known solutions propose a clearance fit. This is considered disadvantageous here, for example when used in combination with a switching valve, since it can lead to a loss of magnetic switching force.

[0008] Furthermore, it is more complex when, in electromechanical wheel brakes, the electronic control device and the associated actuators are also arranged directly on the wheel. These elements therefore belong to the so-called unsprung mass, which should be designed to be particularly rigid and stable. Therefore, for example, an elastic contact solution of the circuit board is also ruled out.

[0009] Therefore, a method and a device are required which avoid or at least alleviate the aforementioned disadvantages. SUMMARY

[0010] The inventors have endeavored to solve this problem.

[0011] Surprisingly, this object is achieved by a holding device, an electromagnetic coil assembly, an actuator and a method for assembling an actuator according to one of the independent claims.

[0012] Preferred embodiments and developments of the application can be derived from the respective dependent claims.

[0013] The application therefore relates in a first aspect to a holding device. The holding device can be used to position and / or hold an electromagnetic coil in an actuator, in particular to axially hold and / or radially position an electromagnetic coil in an actuator. To this end, the holding device can comprise a base body, which has: a connection element, a first leg element, which preferably projects / stands up perpendicularly from a first end of the connection element, a second leg element, which preferably projects perpendicularly from an opposite end of the connection element, wherein the first leg element and the second leg element each have a cylindrical through-opening, which preferably has the same diameter, the respective central axis of which is arranged coaxially to one another, wherein the first leg element and the second leg element are preferably oriented parallel to one another, and wherein the second leg element preferably projects in a radial direction relative to the first leg element, thereby forming a protrusion.

[0014] With the holding device according to the application, an electromagnetic coil can be held in an actuator. To this end, the electromagnetic coil can be fitted into the holding device, in this way forming an electromagnetic coil assembly according to the application, which will be discussed in more detail below. The electromagnetic coil assembly can therefore comprise the holding device and the electromagnetic coil. The holding device can preferably be configured such that the electromagnetic coil is fixed only in one spatial direction, preferably only in the axial direction, before assembly or before assembly is complete, while being able to move in at least one, preferably two, spatial directions perpendicular thereto. After assembly is complete, the electromagnetic coil can be fixed in the holding device or by the holding device in all three spatial directions.

[0015] In other words, the relative movement of the electromagnetic coil with respect to the holding device can be substantially limited in an axial direction, which can be the direction defined by the central axis, especially before the assembly is completed. Advantageously, the holding device can be designed such that the electromagnetic coil is movable with respect to the holding device in two spatial directions perpendicular to the axial direction, also referred to as radial directions. Thus, the electromagnetic coil can be movable with respect to the holding device in the radial directions at the beginning of the assembly, especially before the assembly is completed, so that adjustability is achieved.

[0016] In this way, the application can achieve compensation of shape and position tolerances that can occur in the individual components and during their assembly. This makes it possible to use (partly) automated assembly methods particularly advantageously, even if mechanical calibration of the components is still required.

[0017] Thereby, even if the circuit board is fixed to or on the housing or other components and deviates from the predetermined tolerance range in terms of dimensions due to the tolerances of the individual components, subsequent electrical contacting of the components, for example of the electromagnetic coil and its electrical connections to the circuit board, is still possible. This makes it possible to assemble, for example, the electromagnetic coil and the circuit board cost-effectively, for example using a press-in or press-in method, even if precise positioning of the components with respect to one another is still required in order to be able to establish, for example, electrical contacting.

[0018] The application thus provides the possibility of being able to adjust and position the electromagnetic coil when the assembly is prepared and at the same time to orient the electrical contact portion, for example for electrical contacting to the circuit board, adaptively. Positioning and position tolerances between, for example, the electromagnetic coil and the circuit board can thereby be compensated. In this way, it is possible to ensure high-precision electrical contacting of the circuit board at the same time as optimal orientation of the electromagnetic coil, especially in combination with simple assembly in only one assembly direction.

[0019] To this end, the holding device according to the application proposes a base body with a connection element which is oriented substantially axially. A first and a second leg element can adjoin the axial ends of the connection element. The two leg elements can each extend approximately or exactly perpendicularly from the end of the connection element. The first leg element and the second leg element can be oriented preferably parallel to one another. The base body can thus be configured yoke-like or as a yoke. The perpendicular extension and / or the parallel arrangement of the leg elements is considered advantageous for manufacturing and assembly, but this does not constitute a necessary condition of the application. Rather, the leg elements can also extend non-perpendicularly from the connection element and / or be arranged non-parallel to one another.

[0020] The base body with the connecting element and the two leg elements can be U-shaped or approximately U-shaped when viewed from the side. In other words, the side opposite the connecting element is open. In this way, the electromagnetic coil can be at least partially pushed into and received in the holding device, in particular the base body, while still retaining the movability in the radial direction.

[0021] The two leg elements can have an overall relatively flat structure and, for example, tongue-shaped, project in the radial direction from the connecting element. Perpendicular to this direction, the two leg elements can each have a cylindrical, through-going hole or opening, wherein the respective central axis can be arranged coaxially to one another. This central axis can at the same time constitute a longitudinal axis of the base body, the connecting element can be arranged parallel to this longitudinal axis. According to a preferred embodiment, the two leg elements are perpendicular to the longitudinal axis of the base body and parallel to one another. This can be advantageous, for example, for preventing axial displacement of the held electromagnetic coil.

[0022] To this end, the connecting element can have an extension in the axial direction, i.e. in the longitudinal direction of the base body, which enables the lateral pushing in of the electromagnetic coil. A small excess dimension can facilitate the radial displacement of the electromagnetic coil relative to the base body.

[0023] According to a preferred embodiment of the application, the second leg element can protrude in the radial direction or have a greater extension in the radial direction than the first leg element, so as to form a protrusion relative to the first leg element.

[0024] In the sense of the application, the upper first leg element refers to the leg element that is located on the side on which the electrically contacted electromagnetic coil is mounted. The lower second leg element refers to the leg element that is arranged opposite and, for example, points in the direction of a valve or valve assembly in an actuator of a brake system. This arrangement offers the advantage that the radial, lateral protrusion of the second leg element can be used to support the assembly tool during assembly.

[0025] To this end, the electromagnetic coil can first be mounted or pushed in laterally into the base body. The base body with the electromagnetic coil can then be placed on a valve assembly, in particular after corresponding calibration or orientation, and be press-fitted in the axial direction in a radial press fit to a housing or in a housing.

[0026] The protrusion can thus form a point of action for an assembly tool, which can be applied vertically from above in the axial direction without being hindered by the first leg element. The protrusion can, for example, have the shape of a circular ring segment, which can be considered advantageous in terms of manufacturing and structural stability.

[0027] For better assembly, the second leg element can also preferably comprise at least one laterally protruding nose on both of its longitudinal sides. These noses can likewise constitute the points of action of the assembly tool. In this way, for example, three points of action spaced apart from one another can be formed for the assembly tool. These at least three points of action for the assembly tool can in particular contribute to an as uniform as possible axial press fitting of the holding device.

[0028] It can be advantageous here for the three points of action to have an equal or at least similar spacing from the central axis, so that tilting during assembly can be prevented. It is particularly advantageous for the noses to have an equal spacing from the longitudinal axis of the holding device. The press-in process can take place in a manner similar to a three-point bearing. However, in other embodiments, this can also be different, in that the noses can be arranged asymmetrically or non-symmetrically, i.e. with different spacings from the longitudinal axis. This can also be advantageous from the assembly-technical point of view.

[0029] The electromagnetic coil can be arranged between the first leg element and the second leg element of the base body. The electromagnetic coil can likewise have a through-going cylindrical opening. The central axis of the through-going opening of the electromagnetic coil can be arranged parallel to the central axes of the through-going openings of the leg elements. The central axis of the through-going opening of the electromagnetic coil can in particular also be arranged coaxially or approximately coaxially to the two central axes of the leg elements, but this is not mandatory as a tolerance compensation due to the radial movability of the electromagnetic coil relative to the base body.

[0030] It can be advantageous for the diameters of these through-going openings to be coordinated with one another, so that predetermined components of the actuator, such as the armature and / or the valve tappet, can be passed through and received.

[0031] The electromagnetic coil can also be received in a surrounding coil housing, which can be held together with the electromagnetic coil by the holding device. The coil housing can completely or partially surround the electromagnetic coil laterally.

[0032] The coil housing can have an end side and / or lateral or tangential recesses. It can be particularly advantageous for the noses or other protrusions of the second leg element to pass through these recesses.

[0033] The coil housing can also comprise a floor which is arranged such that, when the electromagnetic coil is assembled in the holding device, the floor is arranged below the second leg element. Thus, the second leg element can be surrounded on the inwardly directed side by the electromagnetic coil and on the opposite side by the floor. In other words, the coil housing can comprise a slot for receiving the leg element, wherein the slot can be formed between the winding and the floor. Thereby, a common contact surface between the second leg element and the floor of the coil housing can be formed, which will also be discussed in more detail below.

[0034] The electromagnetic coil can comprise electrical contacts for electrical contact with the circuit board. In the sense of the present application it is particularly advantageous if the electrical contact is made by means of contact pins. The contact pins can have an axial orientation and / or be arranged radially spaced apart from the central axis.

[0035] To this end, the coil housing may, for example, comprise corresponding holding elements which can carry the contact pins. To achieve lateral alignment, lateral stops can be provided. Preferably, the holding elements are designed in such a way that they can withstand axial pressure which can arise, for example, during assembly, for example during a circuit board press-in or press-fit, and can transmit this pressure to other components.

[0036] In this way, after assembly of the electromagnetic coil, the circuit board can also be assembled in axial assembly direction and the contact pins can be passed through corresponding through-openings of the circuit board which are aligned with the position of the contact pins and make electrical contact there.

[0037] The contact pins can comprise elongated press-in regions for electrical contact with the circuit board. By means of these elongated press-in regions, shape and position tolerances between the electromagnetic coil and the circuit board, which can be firmly connected with the housing of the actuator, can also be compensated in axial direction.

[0038] A particularly preferred embodiment of the present application can provide that the second leg element comprises on the underside facing away from the first leg element a side which has at least one surface region whose surface has a mean roughness Ra which is greater than the mean roughness Ra of the surrounding surface. The mean roughness Ra of the surface of the at least one surface region can be at least 10 pm, preferably at least 15 pm and particularly preferably at least 20 pm. According to a further embodiment of the present application, the mean roughness Ra of the surface of the at least one surface region can be at most 50 pm, preferably at most 40 pm and particularly preferably at most 30 pm.

[0039] The surface region with increased roughness is preferably arranged in such a way that it at least partially comprises that region which forms a joint contact surface with the base plate of the coil housing when the electromagnetic coil is mounted in the holding device.

[0040] This particular advantage of the increased roughness lies in the assembly of the electromagnetic coil assembly. By means of the pressing or pressing-in, in the contact area the side of the second leg element below and the floor of the coil housing are pressed against each other or pressed against each other, wherein a significantly increased static friction force occurs as a result of the increased roughness, which can prevent a further radial displacement of the electromagnetic coil from the holding device. This increased static friction force results in a sufficient fixation of the electromagnetic coil in the radial direction. The electromagnetic coil is then preferably fixed in the three spatial directions after the completion or end of the press fitting and the assembly of further components, for example a circuit board, can take place. Of course, the electromagnetic coil should be calibrated before the fixation.

[0041] The surface area with the increased roughness is sufficient with an extension of at least 1 cm2, preferably at least 2 cm2and particularly preferably at least 3 cm2, 4 cm2, 5 cm2or more. Of course, the surface area with the increased roughness can also comprise the entire contact face or the entire side below.

[0042] The static friction force can be further increased if the floor is made of a slightly ductile material, for example plastic or aluminum. In general, it can be advantageous if the material of the floor is at least not harder than the material of the base body.

[0043] Here, the remaining sides of the base body can have a lower roughness, which can for example result from the manufacture. Thus, the first leg element and / or the connecting element can have at least one side with an average roughness Ra of less than 10 pm, preferably less than 9 pm and particularly preferably less than 8 pm.

[0044] In another aspect of the application, an electromagnetic coil assembly is also included, which has a holding device as described above and an electromagnetic coil held by the holding device.

[0045] In another aspect of the application, an actuator, in particular for a motor vehicle brake system, is also included, which comprises at least one electromagnetic coil assembly as described above. The actuator can comprise or be a component of an electromagnetic valve. The actuator can for example be used in or with an electromechanical wheel brake. In the assembled position, the electromagnetic coil can for example be in action connection with an armature and / or a valve tappet, for example a valve assembly. For this purpose, the armature can be arranged displaceable in the axial direction. The valve tappet can be connected with a valve closure body / valve plug, which can close a flow passage. In operation, the valve closure body can then be displaced in the axial direction.

[0046] In another aspect of the application, a method for assembling an electromagnetic coil assembly, in particular for assembling an electromagnetic coil assembly as described above, is also included, preferably for manufacturing an actuator, which comprises the following steps: - providing an electromagnetic coil assembly, - orienting and aligning the electromagnetic coil in the holding device in a radial direction by means of an adjustment tool, - placing the electromagnetic coil assembly in a predetermined assembly area of the actuator, - axially press-fitting the holding device, preferably in a radial press-fit manner, onto or into the assembly area of the actuator, - removing the press-fitting tool and / or the adjustment tool.

[0047] Here, the electromagnetic coil assembly can be manufactured by fitting the electromagnetic coil into the holding device as described above.

[0048] Here, the adjustment tool can be used for alignment and fixation during the press-fitting and only be removed after the press-fitting connection has been completed.

[0049] The following method steps can subsequently be carried out: - assembly of the circuit board by means of placing and press-fitting in an axial direction, wherein the contact pins of the electromagnetic coil can be inserted in alignment with the pre-provided through openings of the circuit board and can be arranged to achieve electrical contact. BRIEF DESCRIPTION OF DRAWINGS

[0050] Further details of the application can be derived from the described embodiments and the attached claims.

[0051] In the drawings: Figure 1 a perspective view of an exemplary holding device with an electromagnetic coil is shown from above, Figure 2 a perspective view of the holding device of Figure 1 is shown from above, Figure 3 a perspective view of the holding device of Figure 1 is shown from below, Figure 4 a side sectional view of the holding device of Figure 1 is shown, Figure 5 a side sectional view of a part of an actuator is shown, Figure 6 a perspective view of a base body without an electromagnetic coil is shown from below, Figure 7 a further perspective view of a base body with an electromagnetic coil is shown from below, and Figure 8 a perspective view of a further exemplary holding device with an electromagnetic coil is shown from above. DETAILED DESCRIPTION

[0052] In the following detailed description of the preferred embodiments, identical reference signs refer to identical or substantially identical components in these embodiments. In order to better illustrate the present application, the preferred embodiments shown in the drawings are not necessarily drawn to scale.

[0053] Figure 1 An oblique view of an exemplary holding device 10 is shown, which holds an electromagnetic coil 30 from above. The holding device 10 is arranged for axial holding and radial positioning of the electromagnetic coil 30 in an actuator. The holding device 10 comprises a base body 20, which has: - a connecting element 21, - a first leg element 22, which preferably projects perpendicularly from a first end of the connecting element 21, - a second leg element 23, which preferably projects perpendicularly from an opposite end of the connecting element 21, wherein the first leg element 22 and the second leg element 23 each have a cylindrical through opening 25 of preferably the same diameter, whose respective central axes 24 are arranged coaxially to each other, wherein the first leg element 22 and the second leg element 23 are preferably oriented parallel to each other, and wherein the second leg element 23 preferably projects in radial direction relative to the first leg element 22, thereby forming a protrusion 27.

[0054] The electromagnetic coil 30 can be held in an actuator 12 (not shown) by means of the holding device 10. The support of the electromagnetic coil 30 essentially acts in axial direction, in Figure 1 which is denoted by the spatial direction "z". In other words, the relative movement of the electromagnetic coil 30 relative to the holding device 10 can be limited in axial direction, in particular by the first leg element 22 and the second leg element 23.

[0055] In contrast thereto, at least until assembly is completed, a translational movement of the electromagnetic coil 30 relative to the holding device 10 in two spatial directions perpendicular thereto (in Figure 1 which are denoted by the spatial directions "x" and "y") can be realized.

[0056] The actuator 12 (not shown in Figure 1 ) can comprise or be a constituent part of an electromagnetic valve. The actuator 12 can be used in or with an electromechanical wheel brake (not shown), for example.

[0057] Before assembly begins, and especially before the assembly of the electromagnetic coil 30 is completed, the electromagnetic coil 30 can be moved radially relative to the holding device 10. In this way, the invention can compensate for positioning and positional tolerances that may arise in the individual components, such as those in the housing surrounding the actuator 12. This makes it particularly advantageous to employ a (partially) automated assembly method even when mechanical calibration and / or adjustment of the components is still required.

[0058] The present invention, for example, can realize the simple assembly of electromagnetic coils and circuit boards, wherein the electromagnetic coils can be calibrated in advance relative to a predetermined reference point, so that after the assembly of the electromagnetic coils is completed, the circuit boards can preferably be assembled along the same assembly direction.

[0059] This invention can also be used to construct components (e.g., electromagnetic coil 30 and circuit board). Figure 1 Simple electrical contact (not shown) even if the circuit board is fastened to the housing or other components, or the circuit board is fastened to the housing or other components, and the dimensions adjusted due to the tolerance of a single component are no longer within the predetermined tolerance range.

[0060] Therefore, the retaining device 10 includes a base 20 having a connecting element 21 having an axial orientation parallel to the z-axis, and a first leg element 22 and a second leg element 23 adjacent to the connecting element. (As in...) Figure 1 As clearly seen, the two leg elements 22 and 23 extend vertically from opposite ends of the connecting element 21 and are axially spaced apart from each other. Here, the transition portions to these two leg elements 22 and 23 are each formed by an arc, providing advantages in manufacturability and strength. The base 20 can be manufactured integrally in this manner, for example, as a stamped part, and then bent. The first leg element 22 and the second leg element 23 are oriented parallel to each other. Therefore, the base 20 is yoke-shaped or constructed as a yoke.

[0061] The base 20, having a connecting element 21 and two leg elements 22, 23, is configured as open on the side opposite to the connecting element 21 and thus appears U-shaped or approximately U-shaped when viewed from the side. In this way, the electromagnetic coil 30 can be at least partially pushed into and received in the holding device 10 or the base 20, while radial mobility is still maintained. Figure 1 In the diagram shown, the electromagnetic coil 30 is arranged in the base 20.

[0062] The two leg elements 22 and 23 are generally flat in shape to save structural height. In this embodiment, they extend radially from the connecting element 21 in a tongue-like manner.

[0063] The two leg elements 22, 23 each comprise a cylindrical, through-going opening 25 which is embodied perpendicular to the orientation of the two leg elements 22, 23 and thus parallel to the z-axis. The respective central axes 24 of the openings 25 are arranged coaxially to one another. Thus, the two central axes 24 can simultaneously define the longitudinal axis 11 of the base body 20. The two leg elements 22, 23 are thus perpendicular to the longitudinal axis 11. The arrangement formed by the connecting element 21 and the leg elements 22, 23 thus forms a laterally open cavity for receiving the electromagnetic coil 30.

[0064] Furthermore as shown in Figure 1 the illustrated embodiment, the second leg element is configured radially protruding in the radial direction relative to the first leg element and thus has a greater extension in the radial direction, so that a protrusion 27 is formed relative to the first leg element 22. This arrangement offers the advantage that the radial, lateral protrusion 27 of the second leg element 23 can be used to exert an axial pressing force by means of a fitting tool. Advantageously, as shown in Figure 1 the illustrated embodiment, the fitted electromagnetic coil 30 does not cover the protrusion 27.

[0065] The protrusion 27 can thus constitute a point of action of the fitting tool, which can be introduced vertically from above in the axial direction and is not affected by the first leg element 22 and / or the fitted electromagnetic coil 30. In the illustrated embodiment, the protrusion 27 has the shape of a circular ring segment, but this is not mandatory for the present application. Other shapes, for example a nose or other structures, are also conceivable and possible.

[0066] For better fitting, the second leg element 23 also comprises at least one lateral protruding nose 26 on each of its two longitudinal sides 28, for example as can be well seen in Figure 8 the following description. These noses 26 can likewise be points of action of the fitting tool. In this way, three mutually spaced points of action for the fitting tool can be formed, which facilitate the axial pressing of the holding device 10. At least three points of action for the fitting tool enable a very uniform axial pressing of the holding device 10 in a press fit. It can be advantageous here for the protrusion 27 and / or the noses 26 to have an equal or at least similar spacing from the longitudinal axis 11, thereby providing further improved security against tilting during the fitting process.

[0067] In the embodiment of Figure 1 the electromagnetic coil 30 likewise has a cylindrical, through-going opening. The diameters of these through-going openings match one another so that predetermined components of the actuator, for example an armature and / or a valve tappet, can be passed through the openings.

[0068] The electromagnetic coil is received in a surrounding coil housing 37, which, together with the electromagnetic coil 30, is held by the holding device 10. In this embodiment, the coil housing 37 surrounds the electromagnetic coil 30. The coil housing 37 has a lateral, tangential recess 35. Two shoulders 39 of the second leg element 23 project outward through the recess 35. In the embodiment shown, the shoulders 39 can assume the function of lugs and constitute the point of action of the assembly tool. Figure 1

[0069] The electromagnetic coil 30 comprises electrical contacts for electrical contact with a circuit board (not shown). Figure 1 These electrical contacts are designed as contact pins 40, which are oriented in the axial direction. Furthermore, they are laterally or radially spaced apart from the longitudinal axis 11, which makes for simpler contact. In this way, after assembly of the electromagnetic coil 30, the circuit board can also be placed in the axial assembly direction, as shown in the embodiment described below. Figure 5

[0070] The coil housing 37 has holding elements 46, which support the contact pins 40. For lateral alignment, a stop 33 is provided.

[0071] The contact pins 40 comprise elongated press-in regions 41 for electrical contact with the circuit board. By means of these elongated press-in regions 41, positioning and positional tolerances in the axial direction between the electromagnetic coil and the circuit board, which can be fixedly connected to the housing of the actuator, can be compensated. Here, the length of the press-in regions 41 in the axial direction is preferably adapted to the thickness of the circuit board and has a length in the axial direction of at least 1 times, preferably at least 1.1 times, the thickness of the circuit board.

[0072] Figure 2 A partial top view of the holding device shown in Figure 1 is shown.

[0073] Figure 3 An oblique view of the holding device shown in Figure 1 is shown, viewed from below.

[0074] A further aspect of the application also comprises an electromagnetic coil assembly 13, having a holding device 10 as previously embodied and an electromagnetic coil 30 held by the holding device 10.

[0075] The application also comprises an actuator 12, in particular for a motor vehicle brake system, comprising at least one electromagnetic coil assembly 13 as previously embodied.

[0076] To this end, Figure 4 a lateral sectional view of the holding device 10 shown in Figure 1 is shown in the state of installation in an actuator 12, which is shown only in part. In this illustration, the electromagnetic coil assembly 13 is placed on a valve assembly 50 of the actuator 12.​​

[0077] Figure 5 Another lateral sectional view showing a part of the actuator 12. Here further components of the actuator 12 are shown, which likewise need to be in electrical contact with the circuit board (not shown). Purely by way of example, here a further contact pin 42 is shown. Due to the shape and position tolerances of the individual components, the spacing between the two contact pins 40, 42 can be greater than required for the assembly of the circuit board.

[0078] In the assembled position, the electromagnetic coil 30 can be in an active connection with an armature having a valve tappet. For this purpose, the armature can be arranged displaceable in axial direction. The valve tappet can be connected with a valve closure body, which can close a flow-through passage. In operation, the valve closure body can then be displaced in axial direction and the contact pin can pass through a corresponding passage opening of the circuit board and here establish an electrical contact.

[0079] For this purpose, the application provides a corresponding compensation, which enables the assembly of the circuit board in the assembly direction designated with "M". Here, the holding device according to the application enables a calibration in a plane, which is spanned by "x" and "y" and which is perpendicular to the longitudinal axis of the holding device 10, and the elongated press-in region of the contact pin enables a compensation of shape and position deviations in the assembly direction given by "z".

[0080] In Figure 6 A particularly preferred embodiment of the application is shown in a perspective view of the base body 20, viewed from below. In this illustration, the holding device 10 is shown, wherein the electromagnetic coil 30 is not assembled in the base body 20.

[0081] The second lower leg element 23 comprises on the underside facing away from the first leg element 22 a side having at least one surface region 29, the surface of which has a different average roughness Ra than the average roughness of the remaining side. In this embodiment, the average roughness Ra of the surface of this surface region is at least 10 pm, preferably at least 15 pm and particularly preferably at least 20 pm. Here, the average roughness Ra of the surface of this surface region is also at most 50 pm, preferably at most 40 pm and particularly preferably at most 30 pm. In embodiments, this surface region almost comprises the entire lower side, however this is not mandatory for the application. Here, the surface region 29 is arranged such that it comprises the region which forms a joint contact surface with the bottom plate 32 of the coil housing 37 when the electromagnetic coil 30 is assembled into the holding device 10.

[0082] The particularly advantageous increased roughness of the underside relative to the other sides is advantageous both during assembly of the electromagnetic coil assembly and after assembly. By pressing or pressing in, in the contact region, the above-mentioned surface area 29 of the underside of the second leg element 23 points downwards and is pressed against the base plate 32, wherein a significantly increased static friction arises as a result of the increased roughness, which can prevent further radial displacement of the electromagnetic coil from the holding device. This increased static friction ensures a sufficient securing of the electromagnetic coil 30 in the radial direction by the holding device 10. The electromagnetic coil 30 is then secured in three spatial directions after the pressing-in has been completed and the assembly of further components, for example a circuit board, can take place.

[0083] It is also sufficient for the surface area 29 to have only a small extension of at least 1 cm2, preferably at least 2 cm2, particularly preferably at least 3 cm2, 4 cm2, 5 cm2or more. Of course, as shown in the example, the surface area 29 can also completely comprise the side. Figure 6

[0084] In the example shown, the underside of the base body 20 is completely roughened, which can be more easily implemented in terms of manufacturing technology than a partial roughening. The desired surface quality can be produced particularly simply, for example by rolling or roughening.

[0085] If the base plate 32 is made of a slightly ductile material, for example plastic or aluminium, the static friction can be further increased. In this example, the base plate 32 is made of plastic.

[0086] Here, the remaining sides of the base body 20 can have a lower roughness, for example an average roughness Raof less than 10 pm, preferably less than 9 pm and particularly preferably less than 8 pm, which can result from the manufacture.

[0087] The coil housing 37 has a slot for receiving the leg element 23, which is configured between the winding 34 and the base plate 32.

[0088] Alternatively or additionally, it is also possible to provide, as described above, a contact area of the base plate 32 with increased roughness and to increase the static friction in this way.

[0089] A further perspective view of the base body 20 with the mounted electromagnetic coil 30 is shown in Figure 7 from below. As shown in the example in Figure 6 , the surface area 29 with increased roughness comprises the underside of the second leg element 23.

[0090] Figure 8 A perspective view of a further particularly preferred holding device 10 is shown from above, which has an electromagnetic coil 30 mounted in the base body 20. ​

[0091] In this illustration a nose 26 is shown which assists in the clamping of the lower leg element 23. Furthermore, the upper leg element 22 is designed with a recess 38 which cooperates with the nose 26 in order to create space for the clamping tool. In this way, the clamping tool can directly linearly cooperate with the nose 26 in the axial direction during clamping or press fitting, which is considered to be very advantageous.

[0092] Further aspects of the application also include a method for assembling an electromagnetic coil assembly 13, in particular an electromagnetic coil assembly 13 as described above, preferably for generating an actuator 12, comprising the following steps: - providing an electromagnetic coil assembly 13, - orienting and aligning the electromagnetic coil 30 in the radial direction in the holding device 10, preferably by means of an adjustment tool 44, - placing the electromagnetic coil assembly 13 in the predetermined assembly area of the actuator 12, - axially clamping or press fitting the holding device 10, preferably in a press fit, onto or into the assembly area of the actuator 12, preferably using a clamping tool, - removing the clamping tool and / or the adjustment tool 44.

[0093] Here, the adjustment tool 44 can be used for alignment and fixation during clamping and is only removed after the press fit connection has been completed.

[0094] Subsequently, for example, a circuit board can be assembled in the axial direction.

[0095] List of reference signs:

Claims

1. A retaining device (10), particularly for axially retaining and / or radially positioning an electromagnetic coil (30) in an actuator (12), said retaining device comprising a base (20) having: - Connecting element (21), - First leg element (22), the first leg element preferably extending vertically from the first end of the connecting element (21), and - A second leg element (23), which preferably extends vertically from the opposite end of the connecting element (21), wherein The first leg element (22) and the second leg element (23) each have a cylindrical through-opening (25) of preferably the same diameter, and the central axes (24) of the through-openings are arranged coaxially with each other. in, The first leg element (22) and the second leg element (23) are preferably oriented parallel to each other, and The second leg element (23) protrudes radially relative to the first leg element (22), thereby forming a protrusion (27).

2. The holding device (10) according to the preceding claim, characterized in that, The second leg element (23) includes at least one surface region (29) on the side opposite to the first leg element (22), the surface roughness of the surface region being increased, wherein the average roughness Ra is at least 10 μm, preferably at least 15 μm, particularly preferably at least 20 μm, and / or the average roughness Ra of the surface is at most 50 μm, preferably at most 40 μm, and particularly preferably at most 30 μm.

3. The holding device (10) according to any one of the preceding claims, characterized in that, The surface area (29) has an extension dimension of at least 1 cm², preferably at least 2 cm², and particularly preferably at least 3 cm², 4 cm², 5 cm² or greater, or completely includes the side surface.

4. The holding device (10) according to any one of the preceding claims, characterized in that, The first leg element (22) and / or the connecting element (21) have at least one side surface with an average roughness Ra of less than 10 μm, preferably less than 9 μm and particularly preferably less than 8 μm.

5. The holding device (10) according to any one of the preceding claims, characterized in that, The second leg element (23) includes at least one laterally projecting nose (26) or shoulder (39) on at least one longitudinal side (28), preferably on both longitudinal sides (28), and wherein preferably, the first leg element (22) includes a lateral recess (38) corresponding to the nose or shoulder.

6. The holding device (10) according to the preceding claim, characterized in that, The nose (26) or shoulder (39) has an equal distance from the longitudinal axis (11) of the retaining device (10).

7. An electromagnetic coil assembly (13), the electromagnetic coil assembly comprising: The holding device (10) according to any one of the preceding claims and the electromagnetic coil (30) held by the holding device (10) are preferably used in or with the actuator (12) of the braking system of a motor vehicle.

8. The electromagnetic coil assembly (13) according to the preceding claim, characterized in that, The electromagnetic coil (30) is arranged between the first leg element (22) and the second leg element (23) of the base (20), wherein the electromagnetic coil (30) is slidable in the radial direction relative to the base (20) before assembly begins.

9. The electromagnetic coil assembly (13) according to any one of the preceding two claims, characterized in that, The surface area (29) includes at least part of the area that forms a common contact surface with the base plate (32) of the coil housing (37).

10. The electromagnetic coil assembly (13) according to any one of the preceding three claims, characterized in that, The coil housing (37) includes a slot for receiving a second leg element (23), wherein the slot is formed between the winding (34) and the base plate (32).

11. The electromagnetic coil assembly (13) according to any one of the preceding four claims, characterized in that, The electromagnetic coil (30) includes a contact pin (40), wherein the contact pin (40) preferably has an axial orientation, and wherein the contact pin (40) preferably includes an elongated press-in area (41) for electrical contact with the circuit board.

12. An actuator (12), particularly for a braking system of a motor vehicle, the actuator comprising at least one electromagnetic coil assembly (13) according to any one of the preceding claims.

13. A method for assembling an electromagnetic coil assembly (13), particularly an electromagnetic coil assembly (13) according to any one of claims 8 to 12, the method preferably used for manufacturing an actuator (12), comprising the following steps: - Provide electromagnetic coil assembly (13), - The electromagnetic coil (30) is oriented and calibrated radially in the holding device (10), preferably by means of an adjustment tool (44). - Place the electromagnetic coil assembly (13) on or in the predetermined assembly area of ​​the actuator (12). - Press or press the retaining device (10) axially, preferably press or press it onto the assembly area of ​​the actuator (12) in a press-fit manner. - Remove the clamping tool and / or adjusting tool (44).

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