JP2010286364A - Assembling structure of current detecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify constitution of a current detecting device, to facilitate assembling thereof and to enable prevention of occurrence of magnetostriction. <P>SOLUTION: A bus bar 200 and a magnetic shield 400 are provided respectively with screw insertion holes to be penetrated by a screw, at positions to be opposite to each other on the occasion when the bus bar 200 and the magnetic shield 400 are attached to a housing 300. A hole 339 in which the screw 450 penetrating the screw insertion hole of the bus bar 200 and that of the magnetic shield 400 is fitted on the occasion of attaching the bus bar 200 and the magnetic shield 400 to the housing 300, is provided in the lower side of the housing 300. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an assembly structure of a current detection device that can be attached to a bus bar without sacrificing accuracy and has high mass productivity.

  2. Description of the Related Art Conventionally, a current detection device for detecting a current value flowing between a battery and a vehicle electrical component by detecting a magnetic flux generated from a current flowing in a harness connected to a battery terminal is known. The current detection device is attached to a part of the vehicle using a jig such as a bracket. And the said harness is inserted in the detection hole of this electric current detector, and magnetic flux is detected in the part.

  However, in the conventional current detection device, since it is necessary to use separate parts such as a bracket in order to attach the current detector to the vehicle, the number of parts is increased and the configuration is complicated. Furthermore, since it is necessary to pass a flexible harness through the detection hole, it is necessary to enlarge the detection hole from the viewpoint of workability. For this reason, it has been difficult to reduce the size of the current detection device.

  Therefore, a vehicle current detection device has been proposed that is downsized, improves assembly workability, and has a simple configuration (see, for example, Patent Document 1). As shown in FIG. 12, this current detection device has one end 201 of a bus bar 200 fastened with a screw 102 to a terminal 101 of a battery 100 and a current detector 300 supported by the bus bar 200. Further, the other end 202 of the bus bar 200 is connected by a screw 402 and a terminal 401 that bites an end of a harness 400 connected to a vehicle electrical component (not shown).

  Further, as shown in FIG. 13, a magnetic core 302 is fixed to the current detector 300 so as to surround a detection hole 304 through which the bus bar 200 penetrates in a detector body 301 made of synthetic resin. The Hall element 303 is mounted so as to be positioned between both ends of the core 302. As a result, the vehicle current detection device can be easily configured, can be miniaturized, and can further improve the assembly workability.

JP 2001-272422 A

  However, the conventional current detection device has the following disadvantages. That is, as described above, in order to install the core 302 for collecting magnetic flux, it is necessary to provide the detection hole 304 through which the bus bar 200 is inserted, and to insert the bus bar 200 through the detection hole 304. Further, if the shape of the bus bar 200 is complicated, it is difficult to insert the bus bar 200 into the detection hole 304, so that the core 302 is enlarged because the detection hole 304 needs to be formed larger.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a simple structure, easy assembly, and a current detection device assembly structure suitable for downsizing the current detection device. Is to provide.

In order to achieve the above-described object, the assembly structure of the current detection device according to the present invention is characterized by the following (1) to (3).
(1) Bus bar,
A sensor body for detecting magnetism generated from the bus bar, and calculating a value of a current flowing through the bus bar based on the detected magnetism;
A housing having a sensor chamber for housing the sensor body, and a lower surface facing one surface of the bus bar;
A magnetic shield mounted on the housing such that the sensor body and the bus bar are located inside;
With
The bus bar and the magnetic shield are respectively formed with holes that are penetrated by screws at positions facing each other when they are mounted on the housing.
On the lower surface of the housing, a hole for fitting a screw penetrating the hole of the bus bar and the holes of the magnetic shield is formed.
thing.
(2) In the assembly structure of the current detection device having the configuration of (1) above,
Of the lower surface of the housing, the guide groove in which the bus bar is mounted is provided with a locking protrusion protruding downward from the lower surface of the guide groove by a distance corresponding to the thickness of the bus bar, and from the tip of the locking protrusion. A guide surface extending in parallel with the lower surface of the guide groove,
The bus bar is formed with a notch inserted through the locking projection and the guide surface when the bus bar is mounted in the guide groove.
The bus bar in which the notch is inserted by the locking protrusion and the guide surface is temporarily locked in the guide groove by moving toward the locking protrusion along the lower surface of the guide groove,
The hole of the bus bar and the hole of the housing face each other in a state where the bus bar is temporarily locked in the guide groove.
thing.
(3) In the assembly structure of the current detection device having the configuration of (2) above,
Of the lower surface of the housing, the magnetic shield groove to which the magnetic shield is mounted protrudes downward on both the left and right sides of the guide groove, and the front end portion thereof is a horizontal support surface parallel to the guide groove; A magnetic shield supporting protrusion extending in parallel to the tip from a side wall defining the magnetic shield groove, spaced from the tip of the horizontal support surface by a distance corresponding to the thickness of the magnetic shield,
The magnetic shield mounted in the magnetic shield groove and supported by the horizontal support surface moves temporarily toward the magnetic shield support protrusion along the tip of the horizontal support surface, thereby temporarily engaging the magnetic shield groove. Stopped,
The hole of the magnetic shield and the hole of the housing face each other in a state where the magnetic shield is temporarily locked in the magnetic shield groove.
thing.

According to the assembly structure of the current detection device having the configuration (1), the sensor body, the bus bar, and the magnetic shield are integrated with each other by screwing (fitting the synthetic resin screw into the housing through the bus bar and the magnetic shield. ) Can be realized easily and reliably, and therefore the efficiency of assembling the current detection device between the battery and the vehicle electrical component can be increased, and it is suitable for downsizing. In addition, since a metal member such as a caulking member is not used to fix the magnetic shield or bus bar to the housing, the magnetic hysteresis of the metal member due to irregular or broken shape of the caulking process of the metal member Problems such as non-uniformity or deterioration of characteristics do not occur, and magnetic and current detection sensitivities can be maintained well.
According to the assembly structure of the current detection device having the configuration (2), the work of mounting the bus bar to the housing can be made efficient.
According to the assembly structure of the current detection device having the configuration (3), the work of attaching the magnetic shield to the bus bar and the housing can be made efficient.

  The present invention has been briefly described above. Further, details of the present invention will be further clarified by reading through the modes for carrying out the invention described below with reference to the accompanying drawings.

It is a top view which shows the structure of the electric current detection apparatus which concerns on embodiment of this invention. It is the sectional view on the AA line of the principal part of the current extraction device in FIG. It is a bottom view of the principal part of the electric current detection apparatus in FIG. It is a BB sectional view of the current detection device in FIG. It is a block diagram of the bus bar in FIG. It is a block diagram of the magnetic shield in FIG. It is a front view which shows the screw in FIG. It is explanatory drawing of the attachment procedure of the bus bar of FIG. (A) is the housing and bus bar before temporary locking, and (B) is the housing and bus bar after temporary locking. It is explanatory drawing which shows the attachment procedure of the magnetic shield of FIG. (A) is the housing, bus bar, and magnetic shield before temporary locking, and (B) is the housing, bus bar, and magnetic shield after temporary locking. It is a longitudinal cross-sectional view after the assembly | attachment of the whole electric current detection apparatus in FIG. It is a bottom view of the whole electric current detection apparatus in FIG. It is a front view which shows the conventional electric current detection apparatus. It is a side view of the conventional electric current detection apparatus.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings. The current detection device 10 includes a bus bar 200, a housing 300 that forms a connector coupling portion α and a detection portion β, and a magnetic shield 400.

  In the detection unit β, the above-described magnetic detection element 350 for detecting the magnetic field generated from the bus bar 200 is provided on the substrate 351 constituting the sensor body 310, and the bus bar 200 is based on the detected magnetic field strength. The value of the current (I) flowing through is calculated. A substrate 351 having a magnetic detection element 350 is installed in the sensor chamber 332.

  The magnetic detection element 350 detects magnetic flux generated around the current (I) with respect to the flow of the current (I) in the bus bar 200 shown in FIG. That is, the magnetic detection element 350 according to the present embodiment is arranged in the plane direction (that is, the XY plane) for detecting the magnetic flux density of the current (I) flowing through the bus bar 200, and is perpendicular to the plane of the bus bar 200. Directional magnetic flux is not detected. The Z direction perpendicular to the XY plane of the bus bar 200 is a direction in which the magnetic detection element 350 does not detect the magnetic flux. Under such circumstances, the upper portion of the substrate 351 provided with the magnetic detection element 350 is structurally open, but this does not adversely affect magnetic detection.

  The magnetic detection element 350 uses a Hall element utilizing the Hall effect, and outputs an output voltage proportional to the magnetic flux density (generated according to the intensity of the current I flowing through the bus bar 200), for example.

  The bus bar 200 has one end (left end in FIG. 1) attached to one end of a harness (not shown) for connecting the vehicle electrical components, and the other end (right end in FIG. 1). Attached to the battery terminal. As shown in FIGS. 1 and 5, the bus bar 200 has holes 221 and 222 for screwing at both end sides. For example, by using the hole 221, a battery terminal ( It is fastened with a bolt or a screw to a negative terminal (not shown) and is fastened with a bolt or a screw to one end of the harness using the hole 222.

  Further, in the bus bar 200 of this embodiment, a screw insertion for inserting a synthetic resin screw 450 as shown in FIG. 4 at a position between the screw fixing holes 221 and 222 and close to one hole 222. The hole 223 is formed so as to penetrate from the upper surface to the lower surface of the bus bar 200. The screw insertion hole 223 has a smaller diameter than the holes 221 and 222, and has a size and shape (usually round) in which a shaft portion of a screw 450 described later can be inserted. In addition, rectangular notches 224 are formed on both sides of the bus bar 200 near the other hole 221.

  The housing 300 of this embodiment is integrally formed of a synthetic resin material that is non-magnetic and solidifies after heat melting. The connector connecting portion α and the detection are sequentially arranged from the end side near the battery (right side in FIG. 1). Part β. These both side surfaces will be referred to as a first side surface 330A and a second side surface 330B.

  The connector connecting portion α is for connecting a connector (not shown) attached to a signal line (not shown). In this embodiment, a room (hereinafter referred to as a connector chamber 331) in which the four directions are surrounded by standing walls. Configure the connector. This signal line is used to transmit an electric signal corresponding to the strength of the magnetic field detected by the magnetic detection element 350 of the detection unit β described later to a control IC unit (not shown).

  In the detection unit β, a substrate 351 is installed in a sensor chamber 332 surrounded by walls in four directions, and a magnetic detection element 350 is mounted on the substrate 351. The entire substrate 351 on which the magnetic detection element 350 is mounted is hermetically and watertightly covered with an insulating coating such as synthetic resin (not shown). This makes it possible to avoid moisture intrusion into the electronic circuit including the magnetic detection element 350 and interference with external components.

  In addition, an opening is formed in the lower surface of the detection unit β, the magnetic shield 400 is accommodated from below through the opening, and is mounted inside the opening. This opening is referred to as a magnetic shield groove 320. In addition, narrow groove holes 335 penetrating vertically are provided in the side surface portions 330B on both sides of the detection portion β of the housing 300. The length and width of these narrow groove holes 335 are sized such that opposite side wall pieces 445 of a magnetic shield 400 described later can be inserted.

  A horizontal support surface 333 and a magnetic shield support protrusion 337 are formed in the magnetic shield groove 320. As shown in FIGS. 8 and 10, the horizontal support surface 333 is provided so as to protrude downward on the left and right sides of the guide groove 340. The front end portion of the horizontal support surface 333 is parallel to the surface of the guide groove 340 and contacts and supports the inner surface of the magnetic shield 400 accommodated in the magnetic shield groove 320. Further, the magnetic shield support protrusion 337 is arranged to be spaced downward from the tip of the horizontal support surface 333 by the thickness of the magnetic shield 320 and protrudes inward from the side wall 334 defining the magnetic shield groove 320. Is formed. The upper surface of the magnetic shield support protrusion 337 is a guide surface 337 a parallel to the horizontal support surface 333, and a part of the bottom piece 441 of the magnetic shield 400 is placed in the gap G between the horizontal support surface 333 and the guide surface 337 a. By arranging the above, the magnetic shield 400 can be supported in the magnetic shield groove 320.

  On the other hand, a substantially cylindrical boss portion 338 as shown in FIGS. 1 and 2 protrudes from the other end portion of the housing 300, and the boss portion 338 has a substantially central portion on the lower surface of the housing 300. As shown in FIG. 2, an opening 339 is formed. A synthetic resin screw 450 as shown in FIG. 7 can be screwed into the hole 339 from below.

  In addition, a guide groove 340 having a predetermined width that extends to the left and right ends of the housing 300 is formed on the lower surface of the housing 300. As shown in FIG. 3, the guide groove 340 has a predetermined size width and depth that allows the bus bar 200 to slide or move close to. Further, a pair of guide protrusions 341 are provided at the rightmost end portion of the lower surface of the housing 300 so as to protrude from the side walls 340 a of the guide groove 340 toward the center. These guide protrusions 341 are located at a position separated from the bottom surface 340b of the guide groove 340 by the thickness of the bus bar 200, and parallel to the bus bar 200, and from the bottom surface 340b of the guide groove 340 in the thickness direction of the bus bar 200. And a locking protrusion 341b connected to the end portion (right end portion) of the guide surface 341a. By disposing the bus bar 200 in the gap between the bottom surface 340b of the guide groove 340 and the guide surface 341a, the bus bar 200 can be supported on the guide groove 340.

  The magnetic shield 400 is made of an appropriate magnetic material, for example, in the case of the present embodiment, a magnetic plate material having springiness, etc., and has a shape as shown in FIG. The magnetic shield 400 has a U-shape as a whole, and is externally mounted on the housing 300 so as to cover the periphery of the detection unit β of the housing 300 and the bus bar 200 from the outside, and magnetically shields them.

  The magnetic shield 400 includes a bottom piece 441 as shown in FIGS. 4 and 6 and a pair standing on both sides of the bottom piece 441 in order to hold the bus bar 200 from below (outside) and fix it to the detection part β of the housing 300. Side wall piece 445. Further, a locking notch 443 as shown in FIGS. 4 and 6 is provided at one side edge of the side wall piece 445 at a position facing the locking claw 336 provided in the side wall portion 442 forming the narrow groove hole 335. Is provided. The locking notch 443 has a size and shape that can be engaged with the locking claw 336 protruding into the narrow groove hole 335.

  Further, the other end portion of the bottom piece 441 is provided with a screw insertion hole 444 for fastening as shown in FIG. The screw insertion hole 444 has a diameter larger than the outer diameter of the screw insertion hole 223 formed in the bus bar 200 as shown in FIG. The outer diameter of the screw insertion hole 223 formed in the bus bar 200 is slightly larger than the outer diameter of the hole 339 formed in the lower surface of the housing 300. The side wall piece (length) of the magnetic shield 400 is slightly smaller than the length of the narrow groove hole 335 formed in the housing 300.

  FIG. 7 shows a synthetic resin screw 450 as a fastening resin material for fixing the bus bar 200 together with the magnetic shield 400 to the housing 300. The screw 450 integrally includes a large diameter portion 452 having a smaller diameter than the head portion 451 and a screw shaft 453 having a diameter smaller than the large diameter portion 452 at the head portion 451. The large diameter portion 452 is slightly smaller in diameter than the screw insertion hole 444 of the magnetic shield 400. The screw shaft portion 453 is slightly smaller in diameter than the screw insertion hole 223 of the bus bar 200 and slightly larger than the hole 339 of the housing 300.

  The magnetic detection element 350 detects a magnetic flux generated around the current I with respect to the flow of the current I in the bus bar 200. For this reason, the magnetic detection element 350 is arranged in the plane direction for detecting the magnetic flux density of the current I flowing through the bus bar 200 as described above.

  The current detection device 10 in the vehicle according to the above-described embodiment is provided with the magnetic shield 400, and the electromagnetic shielding effect by the magnetic shield 400 is secured, thereby suppressing the adverse electromagnetic influence from the outside. The current flowing through the bus bar 200 can be accurately detected by the current detection element 350. As a result, even when a magnetic field is generated around the Hall element used as the magnetic detection element 350, or when a relay or motor is installed nearby, the electromagnetic shielding action of the magnetic shield 400 causes the relay or It can be avoided that an accurate magnetic detection operation is hindered due to a magnetic field generated from the motor. Moreover, the influence of geomagnetism and high-voltage electric wires can be effectively avoided as the influence of the environment when the vehicle travels.

Next, a method for assembling the current detection device 10 according to this embodiment will be described.
First, the magnetic detection element (Hall element) 350 is mounted on the substrate 351. Then, the substrate 351 on which the magnetic detection element 350 is mounted is inverted so that the magnetic detection element 350 is on the lower side, and installed on the upper surface of the housing 300, that is, in the sensor chamber 332 as shown in FIG. At this time, a terminal that is continuous with the terminal protruding into the connector chamber 331 and that is embedded in the housing 300 and protrudes into the sensor chamber 332 passes through the through hole of the substrate 351 and is soldered to a predetermined circuit pattern. . A part of the periphery of the substrate 351 is supported on a plurality of support bases 361 and 362 provided in the sensor chamber 332 as shown in FIG.

  Next, the upper and lower sides of the housing 300 are inverted (replaced by inversion). At this time, the substrate 351 does not fall down from the sensor chamber 332 due to the connection of the terminal to the substrate 351 by soldering or the like. A bus bar 200 is placed on the inverted housing 300 (the back surface) as shown in FIG. That is, the notch 224 provided in the bus bar 200 is inserted into the guide protrusion 341 (the guide surface 341 a and the locking protrusion 341 b) protruding from the lower surface of the housing 300. Guide 200. Then, the bus bar 200 is brought into contact with the lower surface of the guide groove 340.

  Subsequently, the bus bar 200 is displaced toward the locking projection 341b of the guide projection 341, that is, along the bottom surface 340b of the guide groove 340, to the right (in the direction of arrow D) shown in FIG. Move). As a result, the left edge 224a of the notch 224 moves to the gap between the guide groove 340 and the guide projection 341, and then strikes the locking projection 341b to stop the movement (see FIG. 8). A state in which a part of the bus bar 200 is supported by the guide groove is referred to as temporary locking. In this temporarily locked state, movement in the vertical direction (backlash etc.) at the sandwiched portion is restricted. Further, after the bus bar 200 is moved, the screw insertion hole 223 provided in the bus bar 200 faces the hole 339 formed in the housing 300.

  Subsequently, a magnetic shield 400 is prepared, and each one of the side wall pieces 445 of the magnetic shield 400 is inserted into the narrow groove holes 335 on both sides of the housing 300 as shown in FIG. 320. By this insertion, each side wall piece 445 of the magnetic shield 400 is lightly contacted and held in the narrow groove 335 by its own elastic force. Further, the magnetic shield 400 is placed along the tip of the horizontal support surface 333 while maintaining the contact holding state, and toward the magnetic shield support protrusion 337 formed on the side wall 334 defining the magnetic shield groove 320. That is, it is moved in the direction of arrow E. Then, the right end portion of each side wall piece 445 of the magnetic shield 400 is brought into contact with the right side wall surface 445 a of each narrow groove 335. At this time, the end of the bottom piece 441 of the magnetic shield 400 is placed on the guide surface 337 a of the magnetic shield support protrusion 337 and is disposed in the gap G between the guide surface 337 a and the bottom surface of the housing 330 ( (See FIG. 9). A state in which a part of the magnetic shield 400 is supported by the magnetic shield groove 320 is also referred to as temporary locking. In this temporarily locked state, movement and vibration of the magnetic shield 400 in the vertical direction are restricted at the sandwiched portion. Further, the locking notch 443 formed at one side edge of each side wall piece 445 is locked to a locking claw 336 protruding into the narrow groove hole 335 as shown in FIG. This further restricts the movement of the magnetic shield 400. In this temporarily locked state, the screw insertion hole 444 formed in the magnetic shield 400 faces the screw insertion hole 223 of the bus bar 200 and the hole 339 on the housing 300 side.

  Then, the shaft portion of the screw 450 is screwed into the hole 339 of the housing 300 from the lower surface side of the bottom piece 441 of the magnetic shield 400 through the screw insertion hole 444 of the magnetic shield 400 and the screw insertion hole 223 of the bus bar 200. Thereby, the magnetic shield 400 and the bus bar 200 are assembled to the bottom surface of the housing 300 as shown in FIGS. 4, 10, and 11. At this time, the bottom portion 441 of the magnetic shield 400 is supported by the head portion 451 of the screw 450, and the bus bar 200 is sandwiched between the large diameter portion 452 of the screw 450 and the bottom surface of the housing 300.

  As a result, the magnetic shield 400 and the bus bar 200 do not have a protruding portion such as a caulking portion made of a metal material, and can be attached to the housing 300 using the screw 450 made of synthetic resin. The accuracy of detection and current detection can be improved.

  Note that the current detection device of the present invention is not limited to application as a part of a system in a vehicle as in these embodiments, and can detect current in various fields as long as it has a bus bar. Application as a device is possible.

  As described above, when the bus bar 200 and the magnetic shield 400 are assembled to the housing 300 having the sensor body 310, the assembly structure of the current detection device of this embodiment is such that the bus bar 200 and the magnetic shield 400 are opposed to each other. The formed screw insertion holes 223 and 444 are communicated with each other, and a synthetic resin screw 450 passed through the screw insertion holes 223 and 444 of the bus bar 200 and the magnetic shield 400 is screwed into the lower surface of the housing 300 ( The hole 339 to be fitted) is formed.

  As a result, the screwing operation of the synthetic resin screw 450 to the housing 300 allows the sensor body 310 and the bus bar 200 to be easily integrated, and the current detector 10 can be easily assembled and downsized. . In addition, since no conventional caulking metal member is used to fix the magnetic shield 400 and the bus bar 200 to the housing 300, the caulking shape of the metal member is not uniform or broken. The problem of non-uniformity or deterioration of the magnetic hysteresis characteristics due to the occurrence of the problem does not occur. Therefore, the magnetic and current detection sensitivity can be maintained satisfactorily.

  Further, by temporarily locking one end portion of the bus bar 200 to the housing 300, positioning in assembling between the hole 223 provided in the bus bar 200 and the hole 339 provided in the housing 300 can be simplified. Thus, it is possible to improve the efficiency of attaching the bus bar 200 to the housing 300.

  In addition, by temporarily locking one end portion of the magnetic shield 400 to the housing 300, positioning on the assembly of the hole 444 formed in the magnetic shield 400 and the hole 223 of the bus bar 200 attached to the housing 300 can be easily performed. Therefore, it is possible to improve the efficiency of attaching the magnetic shield 400 to the bus bar 200 and the housing 300.

DESCRIPTION OF SYMBOLS 10 Current detection apparatus 200 Bus bar 223,444 Screw insertion hole 300 Housing 310 Senna main body 331 Connector room 332 Sensor room 334 One side)
339 Hole 340 Guide groove 340a Side wall 341 Guide protrusion 341a Guide surface 341b Locking protrusion 350 Magnetic detection element 351 Substrate 400 Magnetic shield α Connector coupling portion β detection portion

Claims (3)

A bus bar,
A sensor body for detecting magnetism generated from the bus bar, and calculating a value of a current flowing through the bus bar based on the detected magnetism;
A housing having a sensor chamber for housing the sensor body, and a lower surface facing one surface of the bus bar;
A magnetic shield mounted on the housing such that the sensor body and the bus bar are located inside;
With
The bus bar and the magnetic shield are respectively formed with holes that are penetrated by screws at positions facing each other when they are mounted on the housing.
On the lower surface of the housing, a hole for fitting a screw penetrating the hole of the bus bar and the holes of the magnetic shield is formed.
An assembly structure of a current detection device characterized by that. Of the lower surface of the housing, the guide groove in which the bus bar is mounted is provided with a locking protrusion protruding downward from the lower surface of the guide groove by a distance corresponding to the thickness of the bus bar, and from the tip of the locking protrusion. A guide surface extending in parallel with the lower surface of the guide groove,
The bus bar is formed with a notch inserted through the locking projection and the guide surface when the bus bar is mounted in the guide groove.
The bus bar in which the notch is inserted by the locking protrusion and the guide surface is temporarily locked in the guide groove by moving toward the locking protrusion along the lower surface of the guide groove,
The hole of the bus bar and the hole of the housing face each other in a state where the bus bar is temporarily locked in the guide groove.
The assembly structure of the current detection device according to claim 1. Of the lower surface of the housing, the magnetic shield groove to which the magnetic shield is mounted protrudes downward on both the left and right sides of the guide groove, and the front end portion thereof is a horizontal support surface parallel to the guide groove; A magnetic shield supporting protrusion extending in parallel to the tip from a side wall defining the magnetic shield groove, spaced from the tip of the horizontal support surface by a distance corresponding to the thickness of the magnetic shield,
The magnetic shield mounted in the magnetic shield groove and supported by the horizontal support surface moves temporarily toward the magnetic shield support protrusion along the tip of the horizontal support surface, thereby temporarily engaging the magnetic shield groove. Stopped,
The hole of the magnetic shield and the hole of the housing face each other in a state where the magnetic shield is temporarily locked in the magnetic shield groove.
The assembly structure of the current detection device according to claim 2.

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