DE102023111432A1 - Current detection device - Google Patents

Abstract

A current detection device (1) includes: a substrate (3) containing a current detection section; a connection terminal (5) which has a first connection section (51) which is electrically connected to the substrate, a middle section (53) which projects from the first connection section perpendicular to the substrate, a second connection section (52) which is electrically connected to a shunt resistor (4), and comprising a bent portion (54) connecting the second connection portion to the middle portion; a holding member (6) made of resin, molded integrally with the middle portion to hold the middle portion, and supported by the substrate; a fixing terminal (7) comprising a base portion held by the holding member and a projection portion (72) projecting from the holding member and soldered to the substrate for fixing the holding member to the substrate; a housing (2) having an opening (22) exposing the second connection portion; and the shunt resistor disposed outside the housing so as to face the opening and fixed to the second connection portion by a screw member.

Description

Background of the invention

1. Field of the invention

The present invention relates to a current detection device.

2. Description of the prior art

Techniques for detecting currents using shunt resistors are conventionally known. Japanese patent application no. 2020- 201 059 discloses a battery control device that includes a current detection circuit electrically connected to a shunt resistor having a plurality of terminal pins and detecting battery current flowing through the shunt resistor, a substrate on which the current detection circuit is mounted, and a connector mounted on the substrate includes.

According to a configuration in which a shunt resistor is electrically connected to a substrate, it is desirable that the stability of a terminal portion of the substrate be improved.

Summary of the invention

The aim of the present invention is to provide a current detection device that can improve the stability of a connection portion of a substrate connected to a shunt resistor.

To achieve the above object, a current detection device according to an aspect of the present invention includes a substrate having a current detection portion; a connection terminal including a first connection portion electrically connected to the substrate, a middle portion protruding from the first connection portion perpendicular to the substrate, a second connection portion electrically connected to a shunt resistor, and a bent portion, which connects the second connection section to the middle section; a holding member made of resin, integrally molded with the middle portion to hold the middle portion, and supported by the substrate; a mounting terminal including a base portion held by the holding member and a projection portion projecting from the holding member, the projection portion being soldered to the substrate to secure the holding member to the substrate; a housing that houses the substrate, the connection terminal, the attachment terminal and the holding member and has an opening exposing the second connection portion; and the shunt resistor disposed outside the housing so as to face the opening and fixed to the second connection portion by a screw member.

The foregoing and other objects, features, advantages, and technical and industrial significance of this invention will be better understood when the following detailed description of the present preferred embodiments of the invention is read in conjunction with the accompanying drawings.

Brief description of the drawings

• 1 is a perspective view of a current sensing device according to an embodiment;
• 2 Fig. 10 is an exploded perspective view of the current detection device according to the embodiment;
• 3 is a perspective view of a holding member and terminals according to the embodiment;
• 4 is a perspective view of a connection terminal according to the embodiment;
• 5 is a perspective view of a mounting terminal according to the embodiment;
• 6 is a diagram showing the assembling process of the current detection device according to the embodiment; and
• 7 is a cross-sectional view of the current detection device according to the embodiment.

Detailed description of the preferred embodiments

A current detection device according to an embodiment of the present invention will be described in detail below with reference to the drawings. The invention is not limited to this embodiment. The components of the following embodiment include those that can be readily accepted by those skilled in the art or are substantially the same.

Embodiment

The following is with reference to the 1 until 7 one embodiment is described. The present embodiment refers on a current detection device. 1 is a perspective view of a current detection device according to the embodiment. 2 is an exploded perspective view of the current detection device according to the embodiment. 3 is a perspective view of a holding member and terminals according to the embodiment. 4 is a perspective view of a connection terminal according to the embodiment. 5 is a perspective view of a mounting terminal according to the embodiment. 6 is a diagram illustrating the assembly process of the current sensing device according to the embodiment. 7 is a cross-sectional view of the current detection device according to the embodiment.

Like in the 1 until 3 As shown, a current detection device 1 of the present embodiment includes a housing 2, a substrate 3, a shunt resistor 4, connection terminals 5, a holding member 6, a fixing terminal 7, and screw members 8. The current detection device 1 can be mounted in a vehicle battery, for example to record the charging and discharging current of the battery. The current detection device 1 is a so-called shunt current sensor. That is, the current detection device 1 applies a current to the shunt resistor 4 and measures the current value using Ohm's law from the voltage drop that occurs when the current is applied and the resistance value of the shunt resistor 4.

The shunt resistor 4 shown has the shape of a rectangular flat plate. A busbar is connected to each end of the shunt resistor 4. A busbar can e.g. B. be connected to the negative electrode of the battery. The other busbar can e.g. B. be connected to a mass section of the vehicle body. The battery is monitored and controlled based on the current value detected by the current detection device 1.

As in 2 As shown, the current detection device 1 of the present embodiment has, for example, a pair of connection terminals 5 that connect the shunt resistor 4 to the substrate 3. The substrate 3 has a current detection section 31 connected to the shunt resistor 4 via the connection terminals 5. The current detection section 31 may be, for example, a current detection circuit. The current detection device 1 of the present embodiment has a holding member 6 that holds the connection terminals 5. As described below, the holding member 6 can improve the accuracy of current detection and the stability of the connection points between the connection terminals 5 and the substrate 3.

The housing 2 contains the substrate 3, the connection connections 5, the holding element 6 and the fastening connection 7. The housing 2 can, for. B. be formed from an insulating synthetic resin. The housing 2 shown has the shape of a rectangular tube. One end of the housing 2 has an insertion opening 21. The substrate 3, the connection terminals 5, the holding member 6 and the fixing terminal 7 are inserted into the housing 2 through the insertion opening 21. A guide portion 23 that guides the substrate 3 and a holding portion that holds the substrate 3 are formed inside the case 2.

In the following description, the insertion direction of the substrate 3 relative to the housing 2 is referred to as “first direction X”. The first direction The third direction Z is the thickness direction of the substrate 3. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

On the side of the housing 2 facing away from the first direction X, a recess 24 is provided for receiving the shunt resistor 4. The recess 24 is formed in the outer surface of the housing 2. In the top view, the recess 24 has the shape of a rectangle, which corresponds to the shape of the shunt resistor 4. The recess 24 has two openings 22. The two openings 22 are aligned in the second direction Y. The openings 22 can, for. B. have a rectangular shape. The substrate 3 is inserted into the housing 2 to a position where the second connection portions 52 of the connection terminals 5 face the openings 22. The housing 2 holds the substrate 3 so that the second connection portions 52 are exposed through the openings 22.

The housing 2 includes two nuts 10. The nuts 10 are pressed into the housing 2 in the first direction X. The shunt resistor 4 has a pair of first through holes 41, a pair of second through holes 42 and a pair of third through holes 43. The through holes 41, 42 and 43 are aligned in the second Y direction. The first through holes 41 are at the innermost position, and the third through holes 43 are at the outermost positions.

The first through holes 41 are through holes that correspond to the screw elements 8 speak. The screw members 8 are inserted into the first through holes 41 and connected to the second connection portions 52 of the connection terminals 5. The second through holes 42 are through holes that correspond to the screw members 11. The screw elements 11 are fastening elements that attach the shunt resistor 4 to the housing 2. The screw members 11 are inserted into the second through holes 42 and engaged with the threaded holes in the housing 2. The housing 2 can accommodate nuts that correspond to the screw elements 11.

The third through holes 43 are through holes that correspond to the nuts 10. Each of the aforementioned busbars is attached to the shunt resistor 4 by a screw element (not shown) and a nut 10. Each bus bar may have a through hole corresponding to the third through hole 43. In this case, the screw member is inserted through the through hole of the bus bar and the third through hole 43 and engaged with the nut 10.

Connectors 32 are attached to the substrate 3. The current detection section 31 can be connected to an external monitoring device via the connectors 32. A cover 9 is connected to the housing 2 and closes the insertion opening 21 of the housing 2. The cover 9 has through holes which correspond to the connectors 32.

As in 3 shown, the holding element 6 holds two connection connections 5 and a fastening connection 7. The holding element 6 shown is cast from an insulating synthetic resin. The holding element 6 is connected to the two connection connections 5 and the fastening connection 7 by overmolding. The fastening connection 7 is isolated from the connection connections 5. The holding element 6 essentially has the shape of a rectangular prism.

The connection terminals 5, the holding member 6 and the fixing terminal 7 will be described with reference to the directions X, Y and Z in a state in which the holding member 6 is fixed to the substrate 3 and housed in the housing 2. The two connection connections 5 include a first connection connection 5A and a second connection connection 5B. The two connection connections 5 are located on a first edge section 6a of the holding element 6. The fastening connection 7 is located on a second edge section 6b of the holding element 6. The first edge section 6a and the second edge section 6b are the edge sections of the holding element 6 in the first direction X. That is, the fastening port 7 is located in the first direction Substrate 3 between the two internal thread sections 56.

The two connection connections 5 are aligned in the second direction Y. The first connection terminal 5A is located at one end in the second direction Y, and the second connection terminal 5B is at the other end in the second direction Y. The fixing terminal 7 is located in the middle area in the second direction Y. That is, the position of the fixing terminal 7 in the second direction Y is located between the first connection terminal 5A and the second connection terminal 5B, and may be a middle position, for example.

As in 4 shown, each connection terminal 5 has a first connection portion 51, a second connection portion 52, a middle portion 53 and a bent portion 54. The connection terminal 5 is made of a conductive metal such as. B. Copper. The connection port 5 can z. B. can be formed from a single metal plate. The first connection section 51 is physically and electrically connected to the substrate 3. The illustrated first connection portion 51 has the shape of a flat plate or a rectangular column. The first connection portion 51 is inserted into a through hole of the substrate 3 and soldered to the substrate 3. The first connection portion 51 is connected to the current detection portion 31 via the circuit pattern of the substrate 3.

The second connecting section 52 is attached to the shunt resistor 4 by a screw element 8. The illustrated second connecting portion 52 has a body 55 having the shape of a flat plate and a cylindrical internally threaded portion 56. The body 55 has a rectangular shape in plan view. The internally threaded portion 56 protrudes from the middle portion of the body 55 to the side corresponding to the first connecting portion 51. The inner peripheral surface of the internal thread portion 56 has an internal thread formed by thread cutting. The inlet portion of the internally threaded portion 56 includes an inclined surface 56a for guidance.

The middle portion 53 is encapsulated in the resin of the holding member 6 and is held by the holding member 6. The middle section is 53 the section between the first connecting section 51 and the second connecting section 52. The middle section 53 adjoins the first connecting section 51 and is located in an extension of the first connecting section 51. The middle section 53 shown has the shape of a flat plate. The middle portion 53 has a tapered shape that gradually narrows in width toward the first connecting portion 51 in the third direction Z. Each inclined surface 53a is inclined to be closer to the center line of the middle portion 53 when extending toward the first connecting portion 51 in the third direction Z. Steps 53b are located at the ends of the side surfaces of the middle portion 53 on the side corresponding to the second connecting portion 52.

The curved section 54 connects the middle section 53 to the second connection sections 52. The curved section 54 shown is bent so that the second connection section 52 is perpendicular to the first connection section 51. The first connecting portion 51 and the middle portion 53 extend in the third direction Z, and the second connecting portion 52 extends in the first direction X. The bent portion 54 has the shape of an arcuate curve in side view. The width Wd2 of the bent portion 54 is narrower than the width Wd1 of the middle portion 53 and narrower than the width Wd3 of the second connecting portion 52. That is, the bent portion 54 is easily elastically deformable and less rigid than the middle portion 53 and the second Connection section 52.

As in 5 As shown, the attachment terminal 7 has a base portion 71 and a projection portion 72. The attachment terminal 7 is formed of a metal plate. The fastening connection 7 can be conductive. The base portion 71 is encapsulated in the resin of the holding member 6 and is held by the holding member 6. The protruding portion 72 is the part that protrudes from the holding member 6 in the third direction Z.

The base portion 71 has a shape of a flat plate and extends in the third direction Z. The base portion 71 has a tapered shape that gradually tapers toward the projection portion 72 in the third direction Z. Each side surface of the base portion 71 has a plurality of inclined surfaces 71a. Each inclined surface 71a is inclined to be closer to the center line of the base portion 71 when it extends toward the projection portion 72 in the third direction Z. Steps 71b are provided at one end of the base section 71. The steps 71b are located at the end of the base portion 71 opposite to the side corresponding to the projection portion 72.

The projection portion 72 shown has the shape of a flat plate or a rectangular column. The projection portion 72 is inserted into a through hole of the substrate 3 and soldered to the substrate 3. The fixing terminal 7 fixes the holding member 6 on the substrate 3 by soldering the projection portion 72 to the substrate 3.

As in 3 shown, the first connection sections 51 of the connection connections 5 and the projection section 72 of the fastening connection 7 protrude from the holding element 6 in the third direction Z. The first connection sections 51 and the projection section 72 protrude to a first side Z1. The first side Z1 is the side that corresponds to the substrate 3 with respect to the holding element 6. In other words, the first connection portions 51 and the projection portion 72 protrude from the holding member 6 toward the substrate 3.

The second connection sections 52 and the curved sections 54 of the connection terminals 5 protrude from the holding element 6 in the third direction Z. The second connection sections 52 and the curved sections 54 protrude to a second side Z2. The second side Z2 is the side that corresponds to the shunt resistor 4 with respect to the holding element 6. In other words, the second connecting sections 52 and the bent sections 54 protrude from the holding element 6 in the direction of the shunt resistor 4. The bodies 55 and the internally threaded sections 56 of the second connecting sections 52 face the holding element 6 in the third direction Z. The internally threaded sections 56 protrude from the bodies 55 in the third direction Z in the direction of the holding element 6.

The holding element 6 includes three legs 61, 62 and 63, which protrude towards the first side Z1. The substrate 3 carries the three legs 61, 62 and 63. The first leg 61 is located on the side corresponding to the first edge portion 6a, while the second leg 62 and the third leg 63 are located on the side corresponding to the second edge portion 6b corresponds.

The first leg 61 is located between the two first connecting sections 51. The first leg 61 projects from the first edge section 6a to the first side Z1. The first leg 61 has a rectangular shape when viewed from the first direction X. The distal end surface of the first Leg 61 rests on the substrate 3 and is supported by it.

The second leg 62 and the third leg 63 are located at the corners of the holding member 6. The second leg 62 and the third leg 63 are positioned so that the projection portion 72 of the attachment terminal 7 is located therebetween. In other words, the second leg 62 is located on one side of the protruding portion 72 in the second direction Y, and the third leg 63 is located on the other side of the protruding portion 72 in the second direction Y. When the holding member 6 is from the first side As viewed from Z1, the second and third legs 62 and 63 are substantially L-shaped and bent at right angles. The second and third legs 62 and 63 each include a portion extending in the first direction X and a portion extending in the second direction Y. The distal end surfaces of the second leg 62 and the third leg 63 rest on the substrate 3 and are supported by it.

The holding element 6 has projections 64 and 65 which protrude towards the first side Z1. The projection 64 protrudes from the second leg 62, the projection 65 from the third leg 63. The projections 64 and 65 shown have the shape of a circular column. The substrate 3 has positioning portions corresponding to the projections 64 and 65. The positioning sections are recesses or holes that are formed in the substrate 3. By inserting the projections 64 and 65 into the positioning portions, the holding member 6 is positioned relative to the substrate 3.

As in 2 shown, the holding element 6 is arranged on a first surface 3a of the substrate 3. The substrate 3 has through holes that correspond to the connection terminals 5 and the fixing terminal 7. The first connection portions 51 of the connection terminals 5 and the projection portion 72 of the fixing terminal 7 are inserted into the corresponding through holes. The first connection portions 51 and the projection portion 72 are fixed to a second surface 3b of the substrate 3 by soldering. The first connection portions 51 are connected to the circuit pattern of the substrate 3. The projection portion 72 is connected to a mounting surface or the like.

6 shows the housing 2 in which the connection terminals 5 and the like are accommodated at certain positions. The second connection sections 52 of the connection terminals 5 are exposed through the openings 22 of the housing 2. The shunt resistor 4 is arranged in the recess 24 of the housing 2 so that it faces the openings 22 and is fixed to the housing 2 by the screw elements 11. The second connection sections 52 of the connection terminals 5 are fastened to the shunt resistor 4 with the aid of the screw elements 8. The screw elements 8 are inserted into the first through holes 41 of the shunt resistor 4 and engaged with the internal thread portions 56 of the connection terminals 5.

7 shows an XZ cross section with the screw element 8 and the connection connection 5. The cross section of 7 is recorded along the central axis of the screw element 8. As in 7 shown, the first through hole 41 of the shunt resistor 4 lies opposite the internal thread section 56 in the third direction Z. The screw element 8 engages the internally threaded section 56 and brings the body 55 of the connection terminal 5 into contact with the shunt resistor 4. The screw element 8 is conductive and enables the electrical connection of the shunt resistor 4 to the second connection section 52.

The first connection portion 51 of the connection terminal 5 is connected and fixed to the substrate 3 by solder 12. The middle section 53 projects from the first connection section 51 perpendicular to the substrate 3 and in the direction of the shunt resistor 4. The projection section 72 of the fastening connection 7 is fastened to the substrate 3 by the solder 12. The holding element 6 is arranged on the substrate 3 and attached to the substrate 3 by the solder 12.

When the screw member 8 is engaged with the internally threaded portion 56, an external force acts on the second connecting portion 52. The connecting terminal 5 and the holding member 6 of the present embodiment can limit the transmission of this external force to the first connecting portion 51. When the external force acts on the second connection portion 52, the bent portion 54 of the connection terminal 5 can elastically deform to absorb the external force. When the screw member 8 is inserted into the internally threaded portion 56 in an inclined orientation, the bent portion 54 can also elastically deform to allow the internally threaded portion 56 to follow the screw member 8.

The holding member 6 is integrally formed with the middle portion 53 of each connection terminal 5 and holds the middle portion 53 firmly. This allows the holding element 6 to transfer Limit the application of an external force that acts on the second connecting sections 52 to the first connecting section 51. The holding element 6 is carried, for example, by the substrate 3 and can support the middle section 53 against a force in the third direction Z.

In addition, the holding element 6 is attached to the substrate 3 via the fastening connection 7. A force absorbed by the holding element 6 is thus distributed to the connecting section between the fastening connection 7 and the substrate 3. The fastening connection 7 is spaced apart from the middle sections 53 of the connection connections 5 in the first direction X. The fastening connection 7 can thus stabilize the holding element 6 against forces and moments in the first direction X.

The current detection device 1 of the present embodiment can reduce the effect of external forces acting on the connection points between the connection terminals 5 and the substrate 3 and improve the stability of the connection points. As a result, the current detection device 1 of the present embodiment can transmit electrical signals from the shunt resistor 4 to the substrate 3 without affecting the accuracy, thereby ensuring the accuracy of current measurement. In the current detection device 1 of the present embodiment, the shunt resistor 4 is built into the upper surface of the housing 2, thereby reducing the space requirement of the device.

As described above, the current detection device 1 of the present embodiment includes the substrate 3 having the current detection portion 31, the connection terminals 5, the resin holding member 6, the fixing terminal 7, the housing 2, and the shunt resistor 4. Each connection terminal 5 has the first connection portion 51, the middle section 53, the second connection section 52 and the bent section 54. The first connection section 51 is electrically connected to the substrate 3. The middle section 53 projects out of the first connecting section 51 perpendicular to the substrate 3. The second connection section 52 is electrically connected to the shunt resistor 4. The curved section 54 connects the second connecting section 52 to the middle section 53.

The holding member 6 is integrally formed with the middle portions 53, holds the middle portions 53, and is supported by the substrate 3. The attachment terminal 7 includes the base portion 71 held by the holding member 6 and the projection portion 72 protruding from the holding member 6. The fixing terminal 7 fixes the holding member 6 to the substrate 3 by soldering the protruding portion 72 to the substrate 3. The housing 2 contains the substrate 3, the connection terminals 5, the fastening terminal 7 and the holding element 6. The housing 2 has openings 22 which expose the second connection sections 52. The shunt resistor 4 is arranged outside the housing 2 so that it faces the opening 22. The shunt resistor 4 is attached to the second connecting sections 52 with the screw elements 8.

In the current detection device 1 according to the embodiment, the holding member 6 is integrally formed with the middle portions 53 of the connection terminals 5, thereby improving the mechanical strength. In addition, each connection terminal 5 has the bent portion 54 between the middle portion 53 and the second connection portion 52, thereby reducing the possibility that an external force acting on the second connection portion 52 is transmitted to the first connection portion 51. Furthermore, the fixing terminal 7 fixes the holding member 6 firmly on the substrate 3. As a result, the current detection device 1 of the present embodiment can improve the stability of the connection portions of the substrate 3 connected to the shunt resistor 4. For example, the stability of the solder joints between the first connection portion 51 and the substrate 3 is improved.

The second connection portions 52 of the present embodiment each include the body 55, which has the shape of a flat plate and is in contact with the shunt resistor 4, and the cylindrical internal thread portion 56, which protrudes from the body 55 toward the substrate 3. The shunt resistor 4 has first through holes 41 so that the first through holes 41 face the internally threaded portions 56. The screw members 8 are inserted into the first through holes 41 and engaged with the internally threaded portions 56 to fix the second connection portions 52 to the shunt resistor 4. In this configuration, each bent portion 54 absorbs the external force exerted when the screw member 8 is engaged with the internally threaded portion 56.

The holding element 6 of the present embodiment holds the middle sections 53 of the two connection connections 5. The two internally threaded sections 56 face the holding element 6. The fastening connection 7 is in the top view of the substrate 3 between the two Internal thread sections 56 arranged. Thereby, the fixing terminal 7 can properly support the holding member 6 against the external force exerted when the screw members 8 are engaged with the respective internally threaded portions 56.

The shape of the curved portions 54 is not limited to the shape shown. For example, the bending position of each bent portion 54 is not limited to one position. The bent portion 54 may be bent at two or more positions.

The shape of the holding element 6 is not limited to the shape shown. The holding element 6 can accommodate a variety of fastening connections 7. In this case, the fastening connections 7 are individually soldered to the substrate 3.

The contents presented in the above embodiment can be combined and implemented as desired.

In the current detection device according to the present embodiment, the holding member is integrally formed with the central portion of the connection terminal, thereby improving the mechanical strength. In addition, the connection terminal includes the bent portion between the middle portion and the second connection portion, thereby reducing the possibility that an external force acting on the second connection portion is transmitted to the first connection portion. In addition, the fastening connection fixes the holding element firmly on the substrate. The current detection device according to the present invention has the advantageous effect of improving the stability of a connection portion of a substrate connected to a shunt resistor.

Although the invention has been described with a view to full and clear disclosure with respect to particular embodiments, the appended claims are not to be limited in that sense, but are to be construed to cover all modifications and alternative constructions that may occur to one skilled in the art fall appropriately within the fundamental doctrine presented here.

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• JP 2020201059 [0002]

Claims (3)

Current detection device (1), comprising: a substrate (3) having a current detection section (31); a connection terminal (5) which has a first connection section (51) which is electrically connected to the substrate (3), a middle section (53) which projects from the first connection section (51) perpendicular to the substrate (3). second connection portion (52) electrically connected to a shunt resistor (4), and a bent portion (54) connecting the second connection portion (52) to the middle portion (53); a holding member (6) made of resin, integrally molded with the middle portion (53), to hold the middle portion (53), and supported by the substrate (3); a fixing terminal (7) comprising a base portion (71) held by the holding member (6) and a projection portion (72) projecting from the holding member (6), the projection portion (72) being connected to the substrate ( 3) is soldered to attach the holding element (6) to the substrate (3); a housing (2) accommodating the substrate (3), the connection terminal (5), the fixing terminal (7) and the holding member (6) and having an opening (22) exposing the second connection portion (52); and the shunt resistor (4) which is arranged outside the housing (2) so that it faces the opening (22) and which is fixed to the second connection portion (52) by a screw member (8). Current detection device (1). Claim 1 , wherein the second connection portion (52) has a body (55) which has the shape of a flat plate and is in contact with the shunt resistor (4), and a cylindrical internally threaded portion (56) which extends from the body (55). Direction of the substrate (3), the shunt resistor (4) has a through hole (41) so that the through hole (41) faces the internally threaded portion (56), and the screw element (8) into the through hole (41 ) is inserted and engaged with the internally threaded portion (56) to attach the second connecting portion (52) to the shunt resistor (4). Current detection device (1). Claim 2 , wherein the connection connection (5) is one of two connection connections (5), the holding element (6) holds the middle sections (53) of the two connection connections (5), the internally threaded section (56) is one of two internally threaded sections (56), which facing the holding element (6), and the fastening connection (7) is arranged between the two internal thread sections (56) in the top view of the substrate (3).

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