Noise elimination device

Abstract

To reduce unnecessary bending of an engagement portion during assembly while forming a magnetic core into a shape that allows good productivity.SOLUTION: In a noise elimination device M, a pair of engagement portions 15 are disposed at diagonal positions on the side wall 13 near the four corners of an accommodation space 18, which has a rectangular shape in a plan view of a housing 10. An engagement escape portion 35 is provided on a pair of upper and lower ferrite cores 30A, 30B having the same shape to avoid interference with the engagement portions 15 when the cores are first inserted into the accommodation space 18 of the housing 10.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a noise removal device. [Background technology]

[0002] A known type of two-piece magnetic core is the "UU core." A noise elimination device using this type of magnetic core is configured by combining a pair of magnetic cores with the same U-shaped cross section and a recess on one side, with the recesses facing each other, and inserting a conductive member (electric wire or bus bar) through which noise is transmitted into the space secured by the two recesses.

[0003] Noise removal devices using this two-split magnetic core are widely used due to the advantage that the magnetic core can be disposed so as to surround the conductive member by retrofitting (for example, Patent Documents 1 and 2).

[0004] According to this noise removal device, high frequency noise superimposed on the current flowing through the conductive member can be removed by the magnetic core disposed in an annular shape so as to surround the conductive member. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2000-353622 A [Patent Document 2] JP 2017-123415 A Summary of the Invention [Problem to be solved by the invention]

[0006] 14 to 20 show a noise removal device which is the premise of the present invention. By explaining this underlying technology, the problem that the present invention is intended to solve will be made clear.

[0007] FIG. 14 is an exploded perspective view of the noise removal device that is the premise of the present invention. 14, two bus bars designated by reference numeral 50 are conductive members from which noise is to be removed in this device. In order to remove high-frequency noise superimposed on the current flowing through these bus bars 50, 50, this noise removal device M100 is attached to the bus bars 50, 50 after installation. Here, the two bus bars 50, 50 are arranged parallel to each other with a gap between them in the left-right direction and extend in the front-rear direction.

[0008] This noise elimination device M100 is composed of a housing 110 integrally molded from resin, and parts assembled inside the housing 110. The parts assembled inside the housing 110 include a spring 20, a pair of upper and lower ferrite cores 130A, 130B (130), and a pair of upper and lower insulating members (bobbins) 40A, 40B (40). The ferrite core 130 and the insulating member 40 are each divided into upper and lower halves so that they can be attached later to a bus bar 50 that has been arranged in advance.

[0009] The configuration of each part will be described individually. First, housing 110 is disposed so that two bus bars 50, 50 are inserted therethrough. Housing 110 has a bottom wall 11 located below the two bus bars, and front and rear side walls 12, 12 and left and right side walls 13, 13 that stand upward from bottom wall 11 and define accommodation space 18 that is quadrangular (rectangular) in plan view.

[0010] Here, for convenience, the defined directionality will be described first. The directionality defined here is set with respect to the housing 110, and the downward direction in the vertical direction refers to the direction in which the bottom wall 11 of the housing 110 is located, and the upward direction refers to the direction in which the side walls 12, 13 protrude from the bottom wall 11. Note that the vertical direction does not necessarily refer to the top-to-bottom direction, but is illustrated in Fig. 14 as coinciding with the top-to-bottom direction. Also, the left-to-right direction refers to the direction perpendicular to the vertical direction and the direction in which one pair of side walls 13, 13 of the housing 110 is located, and the front-to-rear direction refers to the direction perpendicular to the vertical direction and the left-to-right direction and the direction in which the other pair of side walls 12, 12 is located.

[0011] Of the four side walls 12, 13 of the housing 110, a pair of side walls 12, 12 in the front-rear direction has cutouts 14 through which two bus bars 50, 50 extending along the front-rear direction are inserted. The cutouts 14 are formed from the upper edges of the front and rear side walls 12, 12 toward the bottom wall 11. In addition, of the four side walls 12, 13, a pair of side walls 13, 13 in the left-right direction is provided with engagement portions 15, 15 that can be bent outwardly, which will be described later.

[0012] The ferrite cores (magnetic cores) 130 (130A, 130B) are formed in the same shape so that they can be combined in a pair, one above the other. Each of the ferrite cores 130A, 130B is formed in a rectangular shape with a part cut out in a plan view. Each of the ferrite cores 130A, 130B has a pair of left and right pillar parts 31, 31 that face each other with a gap in the left and right direction, and a connecting part 32 that connects one end of the pair of pillar parts 31, 31 to each other. Each of the ferrite cores 130A, 130B has a recess 33 formed by the pair of pillar parts 31, 31 and the connecting part 32, and has a U-shaped cross section. The ferrite core 130A arranged on the lower side is assembled with the connecting part 32 facing down, and the ferrite core 130B on the upper side is inverted upside down and assembled with the connecting part 32 facing up. Then, the recesses 33 are combined to face each other to form an annular core that surrounds the bus bar 50.

[0013] The pair of engaging portions 15 of the housing 110 are provided symmetrically in the widthwise center near the upper ends of the opposing left and right side walls 13, 13. When the two ferrite cores 130B, 130A are inserted from above into the housing space 18, these engaging portions 15, 15 are pushed by the inserted ferrite cores 130B, 130A and elastically deform outward to allow the insertion, and elastically return to their original positions after the insertion. After all components are inserted, the engaging claws 15a, 15a of the engaging portions 15, 15 that have elastically returned to their original positions engage with the upper edge of the connecting portion 32 of the upper ferrite core 130B that was inserted last, thereby positioning and holding the upper and lower ferrite cores 130 (130A, 130B) in the vertical direction.

[0014] Moreover, the insulating member 40 is mainly housed in a space surrounded by the connecting portion 32 and the column portion 31 of the pair of upper and lower ferrite cores 130 (130A, 130B) housed in the housing 110. The pair of insulating members 40A, 40B are combined with one inverted upside down relative to the other and housed in the housing 110, thereby providing insulation between the two bus bars 50, 50.

[0015] The upper and lower insulating members 40 are resin-molded and have the same shape, but are formed in an asymmetric shape. Each insulating member 40 has a pair of front and rear flange plates 44, 45 arranged along the outer surfaces of the pair of front and rear side walls 12, 12 of the housing 110. The pair of flange plates 44, 45 are integrally connected by a connecting member inserted into the cutouts 14 of the front and rear side walls 12, 12 of the housing 110, i.e., the left and right side plates 41, 42 having different heights and a connecting plate 43 connecting the left and right side plates 41, 42. The distance between the left and right side plates 41, 42 is set to a dimension that allows them to fit into the cutouts 14 of the front and rear side walls 12, 12 of the housing 110 without rattling.

[0016] In addition, a partition plate 46 is provided between the left and right side plates 41, 42. The partition plate 46 is inserted between the two bus bars 50, 50 when the upper and lower insulating members 40 (40A, 40B) are combined. The partition plate 46 is supported by the connecting plate 43 and disposed at a position offset from the center of the insulating member 40 in the left-right direction. The reason for displacing the partition plate 46 is to prevent the partition plates 46 from interfering with each other when the insulating members 40A, 40B are combined facing each other vertically. The partition plates 46 of the upper and lower insulating members 40B, 40A are inserted between the two bus bars 50, 50, and support the inner surface of one bus bar 50 with their tips overlapping, and also serve to insulate the two bus bars 50, 50 from each other.

[0017] Furthermore, a locking piece 47 is provided at the left-right center of the flange plates 44, 45, which engages with the locked portion 17 on the housing 110 side when the lower insulating member 40 is inserted into a predetermined position within the housing 110.

[0018] Next, the assembly procedure will be described. When assembling this noise removal device M100, first, the spring 20 is inserted into the inner bottom portion (upper surface of the bottom wall 11) of the accommodation space 18 of the housing 110. Next, the lower ferrite core 130A is inserted with the connecting portion 32 facing downward. When inserting, the ferrite core 130A is inserted while pushing the engaging portion 15 of the housing 110 and bending it outward. When the insertion is completed, the engaging portion 15 elastically returns to its original position.

[0019] Next, the lower insulating member 40A is inserted on top of that. The lower insulating member 40A is inserted with the tip of the partition plate 46 facing upward. Then, the connecting member (left and right side plates 41, 42 and connecting plate 43) slides along the notches 14 of the front and rear side walls 12, 12 of the housing 110. At the same time, the pair of front and rear flange plates 44, 45 slide along the outer surfaces of the front and rear side walls 12, 12 of the housing 110.

[0020] In this state, housing 110, together with lower ferrite core 130A and lower insulating member 40A, is attached to bus bar 50. Note that bus bar 50 may also be attached to housing 110. In this case, partition plate 46 of lower insulating member 40A is inserted between the two bus bars 50, 50 and is disposed along the inner surface of one of the bus bars 50.

[0021] Next, the upper insulating member 40B is inserted onto the two bus bars 50, 50. The upper insulating member 40B is inserted with the tip of the partition plate 46 facing downward. Then, the connecting members, i.e., the left and right side plates 41, 42 and the connecting plate 43, slide along the notches 14 in the front and rear side walls 12, 12 of the housing 110, and the front and rear flange plates 44, 45 slide along the outer surfaces of the front and rear side walls 12, 12 of the housing 110.

[0022] By inserting in this manner, the partition plate 46 of the upper insulating member 40B is inserted between the two bus bars 50, 50, so that the tips of the upper and lower partition plates 46, 46 overlap each other in the vertical direction, and the upper partition plate 46 is positioned along the inner surface of the other bus bar 50.

[0023] Next, the upper ferrite core 130B is inserted onto the upper insulating member 40B with the connecting portion 32 facing up. When the upper ferrite core 130B is inserted, the engaging portions 15, 15 of the housing 110 are bent outward. When the insertion is completed, as shown in Figs. 15 and 16, the engaging portions 15, 15 elastically return to their original positions, and the engaging claws 15a, 15a of the engaging portions 15, 15 engage with the upper edge of the connecting portion 32 of the upper ferrite core 130B. As a result, all the components, i.e., the spring 20, the upper and lower ferrite cores 130, and the upper and lower insulating members 40, are positioned and held within the housing 110. In addition, the two bus bars 50, 50 are surrounded by the upper and lower ferrite cores 130B, 130A in a state where they are stably insulated by the insulating members 40A, 40B.

[0024] Incidentally, when assembling the noise removal device M100 having the above-mentioned configuration, even when the lower ferrite core 130A, which does not contribute to the engagement of the parts, is inserted, the engaging portions 15, 15 interfere with and are pushed by the lower ferrite core 130A, causing them to bend outward, as shown in Figures 17 and 18. Therefore, in addition to the interference and bending of the engaging portions 15, 15 when the upper ferrite core 130B is inserted, as shown in Figures 19 and 20, the engaging portions 15, 15 are interfered with and bent twice during assembly.

[0025] However, as the number of times the engaging portions 15, 15 are bent increases, the insertion load increases accordingly, and the risk of deformation or deterioration of the engaging portions 15, 15 also increases. Therefore, it is conceivable to provide an engagement relief portion so that the engaging portions 15, 15 do not bend when inserting the lower ferrite core 130A that does not contribute to the engagement.

[0026] However, if an engagement relief portion is provided only on the lower ferrite core 130A, the upper and lower ferrite cores 130B and 130A will have different shapes, and the increased variety of ferrite cores 130 will lead to increased costs.

[0027] The present invention has been made in consideration of the above-mentioned circumstances, and an object of the present invention is to provide a noise elimination device in which paired magnetic cores have the same shape for good productivity and ease of handling, while improving assembly. [Means for solving the problem]

[0028] In order to achieve the above object, a noise removal device according to the present invention has the following features. a pair of identically shaped upper and lower magnetic cores with a U-shaped cross section, each having a recess formed by a pair of pillars opposed to each other at a distance and a connecting portion connecting one ends of the pair of pillars, one of which is arranged with the connecting portion facing down and the other of which is inverted and arranged with the connecting portion facing up, and which are combined with the recesses facing each other to form an annular core surrounding a conductive member through which noise is transmitted; a housing having a bottom wall and four side walls extending upward from the bottom wall to define an accommodation space having a rectangular shape in a plan view, the housing containing and holding the pair of magnetic cores so as to maintain the annular core by inserting one magnetic core with the connecting portion facing downward and the other magnetic core with the connecting portion facing upward, in that order, from above, into the accommodation space; a pair of engagement portions provided near upper ends of a pair of opposing side walls of the housing, the engagement portions being pressed by the inserted magnetic cores and elastically deformed when the magnetic cores are inserted into the accommodating space in order from above, thereby engaging with an upper edge of a connecting portion of the upper magnetic core that is inserted later, thereby positioning and holding the pair of magnetic cores in the up-down direction; Equipped with The pair of engagement portions are disposed at diagonal positions near four corners of an accommodation space having a rectangular shape in a plan view of the housing, The pair of magnetic cores having the same shape are each provided with an engagement relief portion that avoids interference with the engagement portion of the housing when the magnetic cores are first inserted into the accommodation space of the housing with the connection portion facing down. Noise removal device. Effect of the Invention

[0029] According to the present invention, it is possible to improve the ease of assembly while forming paired magnetic cores of the same shape, which is favorable for productivity and handling.

[0030] The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading the following description of the preferred embodiment of the present invention (hereinafter, referred to as "embodiment") with reference to the accompanying drawings. [Brief description of the drawings]

[0031] [Figure 1] FIG. 1 is an exploded perspective view of a noise removal device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is an explanatory diagram of the assembly procedure of the device, and is a perspective view showing the state in the middle of inserting the lower ferrite core into the housing. [Diagram 3]FIG. 3 is a plan view of FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line XX in FIG. [Diagram 5] FIG. 5 is a perspective view showing a state when the lower ferrite core has been completely inserted. [Figure 6] FIG. 6 is a plan view of FIG. [Figure 7] FIG. 7 is a cross-sectional view taken along line XX in FIG. [Figure 8] FIG. 8 is an explanatory diagram of the assembly procedure of the device, and is a perspective view showing the state in the middle of inserting the upper ferrite core into the housing. [Figure 9] FIG. 9 is a plan view of FIG. [Figure 10] FIG. 10 is a cross-sectional view taken along line XX in FIG. [Figure 11] FIG. 11 is a perspective view showing a state when the upper ferrite core has been completely inserted (when assembly has been completed). [Figure 12] FIG. 12 is a plan view of FIG. [Figure 13] FIG. 13 is a cross-sectional view taken along line XX in FIG. [Figure 14] FIG. 14 is an exploded perspective view of a noise removal device exemplified as a prerequisite technique for the present invention. [Figure 15] FIG. 15 is a perspective view showing the appearance of the device in FIG. 14 in a completed state. [Figure 16] FIG. 16 is a vertical cross-sectional view of FIG. [Figure 17] FIG. 17 is a perspective view showing the device of FIG. 14 in the middle of being assembled, showing the state in which the lower ferrite core is being inserted into the housing. [Figure 18] FIG. 18 is a vertical cross-sectional view of FIG. [Figure 19] FIG. 19 is a perspective view showing a state in which the upper ferrite core is in the middle of being inserted into the housing. [Figure 20] FIG. 20 is a vertical cross-sectional view of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] Specific embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an exploded perspective view of a noise removal device according to an embodiment of the present invention. The noise removal device M of this embodiment differs from the noise removal device M100 of the prerequisite technology shown in Fig. 14 in the following respects: The components having different configurations are the housing 10 and the ferrite core 30.

[0033] The difference in the configuration is that a pair of engagement parts 15 formed near the upper ends of the left and right side walls 13, 13 of the housing 10 is arranged not in the center of the width direction of the side walls 13, 13 as in the base technology, but in diagonal positions close to the four corners of the accommodation space 18 of the housing 10, which is rectangular in plan view. In other words, each engagement part 15 is provided at any position except the center position in the front-rear direction at the upper end of each side wall 13, so that the pair of engagement parts 15 are arranged at diagonal positions. The other difference is that each of a pair of ferrite cores 30 (30A, 30B) having the same shape is provided with an engagement escape part 35 for avoiding interference with the engagement parts 15, 15 of the housing 10 when the pair of ferrite cores 30 (30A, 30B) is first inserted into the accommodation space 18 of the housing 10 with the connecting part 32 facing down. The engagement escape part 35 is provided corresponding to the position of the engagement part 15. The engagement escape portions 35 are provided in two diagonal positions among the four corners of the rectangular shape in plan view in each of the ferrite cores 30A and 30B. In other words, each of the engagement escape portions 35 is a recess extending over the entire vertical direction of the column portion 31 and the connecting portion 32 of each of the ferrite cores 30A and 30B, and is provided at any position except the center position in the front-rear direction, so that a pair of the engagement escape portions 35 are disposed at diagonal positions.

[0034] The other configuration is the same as that of the noise removal device M100 described above with reference to FIG. 14 as the underlying technique, so the same components in the drawings are given the same reference numerals and the description thereof is omitted.

[0035] Next, the operation will be described. FIG. 2 is an explanatory diagram of the assembly procedure of the noise removal device M of the embodiment, and is an oblique view showing the state in the middle of inserting the lower ferrite core 30A into the housing 10, FIG. 3 is a plan view of FIG. 2, FIG. 4 is a cross-sectional view taken along the XX arrow of FIG. 3, FIG. 5 is an oblique view showing the state when insertion of the lower ferrite core 30A is completed, FIG. 6 is a plan view of FIG. 5, FIG. 7 is a cross-sectional view taken along the XX arrow of FIG. 6, FIG. 8 is an oblique view showing the state in the middle of inserting the upper ferrite core 30B into the housing 10, FIG. 9 is a plan view of FIG. 8, FIG. 10 is a cross-sectional view taken along the XX arrow of FIG. 9, FIG. 11 is an oblique view showing the state when insertion of the upper ferrite core 30B is completed (when assembly is completed), FIG. 12 is a plan view of FIG. 11, and FIG. 13 is a cross-sectional view taken along the XX arrow of FIG. 12.

[0036] When assembling the noise removal device M of the embodiment, first, the spring 20 is inserted into the inner bottom portion (upper surface of the bottom wall 11) of the accommodation space 18 of the housing 10. Next, as shown in Figs. 2 to 4, the lower ferrite core 30A is inserted with the connecting portion 32 facing downward.

[0037] During the insertion, the position of the engagement relief portion 35 of the ferrite core 30A coincides with the position of the engagement portion 15 of the housing 10. Therefore, since the ferrite core 30 (30A) has the engagement relief portion 35, the ferrite core 30A on the lower side can be inserted into a predetermined position in the housing 10 without interfering with the engagement portion 15, that is, without elastically deforming the engagement portion 15.

[0038] 5 to 7 show the state when the insertion of the lower ferrite core 30A is completed. When the lower ferrite core 30A is inserted, the engagement portion 15 does not bend at all and remains in its original position, allowing the lower ferrite core 30A to pass through.

[0039] Next, the lower insulating member 40A is inserted on top of that. The lower insulating member 40A is inserted with the tip of the partition plate 46 facing upward. Then, the connecting member (left and right side plates 41, 42 and connecting plate 43) slides along the notches 14 in the front and rear side walls 12, 12 of the housing 10. At the same time, the pair of front and rear flange plates 44, 45 slide along the outer surfaces of the front and rear side walls 12, 12 of the housing 10.

[0040] In this state, the housing 10, together with the lower ferrite core 30A and the lower insulating member 40A, is attached to the bus bar 50 (note that the bus bar 50 may be attached to the housing 10). Then, the partition plate 46 of the lower insulating member 40A is inserted between the two bus bars 50, 50, and is disposed along the inner surface of one of the bus bars 50.

[0041] Next, the upper insulating member 40B is inserted on top of that. The upper insulating member 40B is inserted with the tip of the partition plate 46 facing downward. Then, the connecting member (the left and right side plates 41, 42 and the connecting plate 43) slides along the notches 14 of the front and rear side walls 12, 12 of the housing 110, and the front and rear flange plates 44, 45 slide along the outer surfaces of the front and rear side walls 12, 12 of the housing 110.

[0042] By inserting them in this manner, as shown in Figure 10, the partition plate 46 of the upper insulating member 40B is inserted between the two bus bars 50, 50, the tips of the upper and lower partition plates 46, 46 overlap each other in the vertical direction, and the upper partition plate 46 is positioned along the inner surface of the other bus bar 50.

[0043] Next, as shown in Figs. 8 to 10, the upper ferrite core 30B is inserted into the housing 10 with the connecting portion 32 facing up. During insertion, the upper ferrite core 30B is inserted while bending the engaging portions 15, 15 of the housing 10 outward. When the insertion is complete, as shown in Figs. 11 to 13, the engaging portions 15, 15 elastically return to their original positions, causing the engaging claws 15a, 15a of the engaging portions 15, 15 to engage with the upper edge of the connecting portion 32 of the upper ferrite core 30B.

[0044] As a result, all components (spring 20, upper and lower ferrite cores 130, upper and lower insulating members 40) are positioned and held within housing 10. Furthermore, two bus bars 50, 50 are surrounded by upper and lower ferrite cores 30B, 30A in a state where they are stably insulated by insulating members 40A, 40B. Then, assembly of noise removal device M of this embodiment is completed.

[0045] As described above, in the noise removal device M of this embodiment, when the lower ferrite core 30A is inserted from above into the accommodation space 18 of the housing 10 with the connecting portion 32 facing downward, the position of the engagement relief portion 35 of the ferrite core 30A coincides with the position of the engagement portion 15 of the housing 10. Therefore, the presence of the engagement relief portion 35 allows the ferrite core 30A to be inserted into a predetermined position in the housing 10 without the ferrite core 30A interfering with the engagement portion 15, that is, without elastically deforming the engagement portion 15.

[0046] Thereafter, when the upper ferrite core 30B is inserted with the connecting portion 32 facing up, the position of the engagement relief portion 35 of the ferrite core 30B changes to the opposite diagonal position, so that the position of the engagement relief portion 35 of the ferrite core 30B does not match the position of the engagement portion 15 of the housing 10. Therefore, the ferrite core 30B interferes with the engagement portion 15 during the insertion stage, and the ferrite core 30B is inserted while elastically deforming the engagement portion 15. Then, after insertion, the engagement portion 15 engages with the upper edge of the connecting portion 32 of the upper ferrite core 30B, so that the pair of upper and lower ferrite cores 30B, 30A can be positioned and held in the vertical direction.

[0047] That is, the lower ferrite core 30A can be inserted into the accommodation space 18 of the housing 10 without bending the engagement portion 15 of the housing 10 due to the action of the engagement escape portion 35. This makes it possible to reduce the insertion force and facilitates insertion. Also, since there is no need to apply extra bending to the engagement portion 15 of the housing 10, the risk of deterioration of engagement performance due to deformation or deterioration of the engagement portion 15 is reduced. Moreover, to obtain such an effect, instead of providing the engagement escape portion 35 only to one (lower) ferrite core 30A, both ferrite cores 30A, 30B can be made to have the same shape, which does not lead to an increase in the number of parts.

[0048] Here, the features of the noise removal device according to the embodiment of the present invention described above will be briefly summarized and listed below [1]. [1] A pair of identically shaped magnetic cores (ferrite cores 30, 30A, 30B) each having a U-shaped cross section and a rectangular shape in a plan view, which are arranged on the upper and lower sides of the magnetic core (ferrite cores 30, 30A, 30B), each having a recess (33) formed by a pair of opposing pillar portions (31) with a gap therebetween and a connecting portion (32) connecting one end of the pair of pillar portions to each other, one of which is arranged with the connecting portion facing down and the other is arranged upside down with the connecting portion facing up, and which are combined with the recesses facing each other to form an annular core surrounding a conductive member (50) through which noise is transmitted; a housing (10) having a bottom wall (11) and four side walls (12, 13) erected upward from the bottom wall and constituting an accommodation space (18) having a rectangular shape in a plan view, wherein one magnetic core with the connecting portion facing down and the other magnetic core with the connecting portion facing up are inserted into the accommodation space from above in this order, thereby housing and holding the pair of magnetic cores so as to maintain the annular core; a pair of engaging portions (15) provided near upper ends of a pair of opposing side walls (13) of the housing, which are pressed by the inserted magnetic cores and elastically deformed when the magnetic cores are inserted into the accommodating space in order from above, thereby engaging with an upper edge of the connecting portion of the upper magnetic core that is inserted later, thereby positioning and holding the pair of magnetic cores in the up-down direction; Equipped with The pair of engagement portions (15) are disposed at diagonal positions close to the four corners of the accommodation space (18) having a rectangular shape in a plan view of the housing, The pair of magnetic cores having the same shape are each provided with an engagement relief portion (35) for avoiding interference with the engagement portion of the housing when the magnetic cores are first inserted into the housing space with the connecting portion facing down. Noise remover (M).

[0049] According to the configuration [1] above, when one of the magnetic cores (lower magnetic core) (30A) is inserted from above into the accommodation space (18) of the housing (10) with the connecting portion (32) facing downward, the position of the engagement relief portion (35) of the magnetic core coincides with the position of the engagement portion (15) of the housing. Therefore, the presence of the engagement relief portion allows the magnetic core to be inserted into the housing without interfering with the engagement portion, i.e., without elastically deforming the engagement portion. Thereafter, when the other magnetic core (upper magnetic core) (30B) is inserted with the connecting portion facing up, the position of the engagement relief portion (35) of the magnetic core changes to the opposite diagonal position. As a result, the position of the engagement relief portion (35) of the magnetic core does not match the position of the engagement portion (15) of the housing. Therefore, the magnetic core interferes with the engagement portion during the insertion stage, and the magnetic core is inserted while elastically deforming the engagement portion. Then, after insertion, the engagement portion engages with the upper edge of the connecting portion of the upper magnetic core, making it possible to position and hold the pair of upper and lower magnetic cores in the vertical direction. In other words, the lower magnetic core (30A) can be inserted into the housing's storage space without bending the housing's engagement portion (15) due to the action of the engagement relief portion (35). This reduces the insertion force, making insertion easier. Also, since there is no need to apply excessive bending to the housing's engagement portion, the risk of deterioration of engagement performance due to deformation or deterioration of the engagement portion is reduced. Moreover, to achieve this effect, rather than providing the engagement relief portion (35) to only one (lower) magnetic core (30A), both magnetic cores (30A, 30B) can be made to have the same shape, which does not lead to an increase in the number of parts. [Explanation of symbols]

[0050] M Noise Elimination Device 10. Housing 11 Bottom wall 12 Front and rear side walls 13 Left and right side walls 14 Notch 15 Engagement part 18 Containment Space 30 Ferrite core (magnetic core) 30A Lower ferrite core (magnetic core) 30B Upper ferrite core (magnetic core) 31 Column section 32 Connecting part 33 Recess 35 Engagement relief portion 40 Insulating materials 40A Lower insulation material 40B Upper insulating member 41,42 Left and right side plates 43 Connecting plate 44,45 Tsuba plate 46 Partition 50 Busbar (conductive material)

Claims

[Claim 1] a pair of identically shaped upper and lower magnetic cores with a U-shaped cross section, each having a recess formed by a pair of opposing pillars at a distance and a connecting portion connecting one ends of the pair of pillars, one of which is arranged with the connecting portion facing down and the other of which is inverted and arranged with the connecting portion facing up, and which are combined with the recesses facing each other to form an annular core surrounding a conductive member through which noise is transmitted; a housing having a bottom wall and four side walls extending upward from the bottom wall to define an accommodation space having a rectangular shape in a plan view, the housing containing and holding the pair of magnetic cores so as to maintain the annular core by inserting one magnetic core with the connecting portion facing downward and the other magnetic core with the connecting portion facing upward, in that order, from above, into the accommodation space; a pair of engagement portions provided near upper ends of a pair of opposing side walls of the housing, the engagement portions being pressed by the inserted magnetic cores and elastically deformed when the magnetic cores are inserted into the accommodating space in order from above, thereby engaging with an upper edge of a connecting portion of the upper magnetic core that is inserted later, thereby positioning and holding the pair of magnetic cores in the up-down direction; Equipped with The pair of engagement portions are disposed at diagonal positions near four corners of an accommodation space having a rectangular shape in a plan view of the housing, the pair of magnetic cores having the same shape are each provided with an engagement relief portion for avoiding interference with an engagement portion of the housing when the magnetic cores are first inserted into the accommodation space of the housing with the connecting portion facing down, Noise removal device.

Images