Noise filter

Abstract

The present disclosure provides a noise filter. The noise filter of the present disclosure is provided with: a non-divided magnetic core formed with a through-hole having a first opening portion and a second opening portion at both ends; a conductive connection terminal disposed inside the through-hole and having a first connection portion and a second connection portion capable of being connected to a bus bar at both ends; and a holding portion holding the connection terminal disposed inside the through-hole, wherein the connection terminal is held by the holding portion to the magnetic core in a state where the first connection portion is directed from inside the through-hole to the first opening portion side and the second connection portion is directed from inside the through-hole to the second opening portion side.

Description

[0001] Cross-referencing of related applications

[0002] This international application claims priority based on Japanese Patent Application No. 2020-124449, filed with the Japan Patent Office on July 21, 2020, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to a noise filter for suppressing noise radiated from a busbar. Background Technology

[0004] Patent Document 1 describes a noise filter that takes measures against noise radiated from a conductive busbar. The noise filter has a magnetic core with a through hole, and is used by passing the busbar through the through hole of the magnetic core.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent document 1: Japanese Patent Application Publication No. 2019-186406. Summary of the Invention

[0008] The problem the invention aims to solve

[0009] Considering the handling of busbars within the device, curved busbars are sometimes used. However, even when a curved busbar is inserted into the through-hole of the magnetic core, the curved portion interferes with the opening edge of the through-hole, preventing it from penetrating completely. In such cases, for example, one could consider using a configuration that increases the inner diameter of the through-hole of the magnetic core or designing the magnetic core as a segmented structure to allow the curved busbar to pass through the through-hole. However, a larger inner diameter of the through-hole results in a lower impedance of the magnetic core, thus reducing the noise reduction effect of the noise filter. Furthermore, when the magnetic core is designed as a segmented structure, the permeability of the magnetic core decreases, further reducing the noise reduction effect of the noise filter.

[0010] This disclosure preferably provides a noise filter that increases the freedom of busbar shape within the device and does not easily reduce the noise reduction effect.

[0011] Technical solution

[0012] One aspect of the noise filter disclosed herein includes: a non-segmented magnetic core having a through hole having a first opening and a second opening at both ends; a conductive connecting terminal disposed inside the through hole and having a first connecting portion and a second connecting portion at both ends capable of connecting to a busbar; and a holding portion holding the connecting terminal disposed inside the through hole, wherein the connecting terminal is held in the magnetic core by the holding portion with the first connecting portion facing the first opening from inside the through hole and the second connecting portion facing the second opening from inside the through hole.

[0013] In the above configuration, a conductive connecting terminal is disposed in the through hole of the integrally formed magnetic core. This connecting terminal has a first connecting portion and a second connecting portion at both ends, allowing connection to a busbar. The connecting terminal is held within the through hole by a holding portion in the extending direction of the through hole, with the first connecting portion facing from the inside of the through hole toward the first opening and the second connecting portion facing from the inside of the through hole toward the second opening. Thus, in a set of busbars, the first busbar is connected from the first opening side of the through hole to the first connecting portion, and the second busbar is connected from the second opening side of the through hole to the second connecting portion, thereby connecting the two busbars. Therefore, even when using a non-segmented magnetic core, regardless of the bending shape of the busbar, the signal flowing through the first busbar can flow through the through hole of the magnetic core to the second busbar. As a result, the freedom of busbar shape within the device can be increased, and the noise reduction effect of the noise filter is less likely to be reduced.

[0014] One aspect of the noise filter disclosed herein may include a housing that houses a magnetic core formed of a non-conductive resin, wherein the housing has a cylindrical through-hole that houses the magnetic core through the through-hole, and connecting terminals are disposed inside the through-hole.

[0015] In one aspect of the noise filter disclosed herein, the holding portion may have a receiving portion disposed inside the through hole, and the connecting terminal is held by the receiving portion accommodating the connecting terminal. Therefore, the connecting terminal can be held inside the through hole while ensuring insulation between the connecting terminal and the magnetic core, thus enabling proper signal transmission between busbars and minimizing the reduction effect of the noise filter.

[0016] In one aspect of the noise filter disclosed herein, a retaining portion may be disposed inside the through-hole, and a locking portion may be provided to lock the retaining portion into the magnetic core. This allows for reliable positioning of the connecting terminal within the through-hole of the magnetic core by increasing the holding force of the retaining portion on the magnetic core. Therefore, for example, even when an external force is applied to the connecting terminal via the busbar, it is possible to prevent the connecting terminal from being pulled outward from the through-hole of the magnetic core, and to suppress any reduction in the noise reduction effect of the noise filter.

[0017] In one aspect of this disclosure, the noise filter may include a housing that accommodates a magnetic core formed of non-conductive resin, wherein a retaining portion is disposed inside a through-hole and integrally formed with the housing. Thus, the noise filter with the housing can achieve the effects of this disclosure and suppress the increase in the number of components.

[0018] Beneficial effects

[0019] According to this disclosure, a noise filter can be provided that increases the degree of freedom in the shape of the busbar within the device and does not easily reduce the noise reduction effect of the noise filter. Attached Figure Description

[0020] Figure 1 This is a 3D diagram of a noise filter.

[0021] Figure 2 This is a 3D diagram of a noise filter.

[0022] Figure 3 This is a cross-sectional view of the magnetic core.

[0023] Figure 4 This is a three-dimensional view of the retaining part.

[0024] Figure 5 This is an exploded view of the retaining section.

[0025] Figure 6 This is a cross-sectional view of a noise filter on a plane parallel to the first and second directions.

[0026] Figure 7 It is a sectional view of the container body on a plane parallel to the second and third directions.

[0027] Figure 8 This is a cross-sectional view of the first cover portion on a surface parallel to the second and third directions.

[0028] Figure 9 This is a cross-sectional view of the second cover portion on a surface parallel to the second and third directions.

[0029] Figure 10 This diagram illustrates the connection terminals.

[0030] Figure 11 This diagram illustrates the connection terminals.

[0031] Figure 12 This is a perspective view of the noise filter according to the second embodiment.

[0032] Figure 13 This is a cross-sectional view of a noise filter on a plane parallel to the first and third directions.

[0033] Figure 14 This is a cross-sectional view of a noise filter on a plane parallel to the first and second directions.

[0034] Explanation of reference numerals in the attached figures

[0035] 10: Noise filter;

[0036] 20: Magnetic core;

[0037] 40, 50: Connecting terminals;

[0038] 41: First connecting part;

[0039] 42: Second connecting part;

[0040] 60: Maintaining part;

[0041] 101, 102, 103, 104: Busbars;

[0042] 613, 614, 615, 616: Openings. Detailed Implementation

[0043] The following description, with reference to the accompanying drawings, will explain the implementation of the noise filter. It should be noted that, in the following explanation, the directions shown in the drawings will be used as needed. Specifically, the direction in which the through-hole of the magnetic core extends is designated as the first direction, and the directions orthogonal to this first direction are designated as the second and third directions, respectively. However, these directions are merely defined for the purpose of concisely illustrating the relative positional relationships of the components constituting the noise filter. In actual use, the direction in which the noise filter faces is arbitrary; for example, the noise filter can be used in the third direction shown in the drawings even when its relationship with gravity is inconsistent with the vertical direction.

[0044] [1. First Implementation Method]

[0045] [1-1. Composition]

[0046] Figure 1 and Figure 2The noise filter 10 shown is connected to busbars 101, 102, 103, and 104 to suppress noise radiation from busbars 101 to 104. Specifically, the noise filter 10 connects a set of busbars 101 and 102, allowing signals flowing from a circuit not shown to busbar 101 to pass through the through-hole of the magnetic core 20 and be relayed to busbar 102. The noise filter 10 also connects a set of busbars 103 and 104, allowing signals flowing from a circuit not shown to busbar 103 to pass through the through-hole of the magnetic core 20 and be relayed to busbar 104.

[0047] In this embodiment, busbars 101-104 are formed by bending a flat plate to have a mounting base, an extension portion, and an insertion portion. Mounting base portions 101a, 102a, 103a, and 104a are portions with through holes. These through holes are for terminal fixing bolts to pass through, used to fix busbars 101-104 to the device. In this embodiment, mounting base portions 101a-104a have a surface parallel to a plane defined by a first direction D1 and a second direction D2. Extension portions 101b, 102b, 103b, and 104b are portions in each busbar 101-104 that connect the mounting base portions 101a-104a and the insertion portions 101c-104c. In this embodiment, the extension portions 101b to 104b are portions that are bent in a predetermined direction relative to the mounting portions 101a to 104a and the insertion portions 101c to 104c. The insertion portions 101c, 102c, 103c, and 104c are portions that are connected to the connection terminals 40 and 50 provided on the noise filter 10.

[0048] In addition to the magnetic core 20 mentioned above, the noise filter 10 also includes connection terminals 40 and 50 and a holding part 60. Figure 3 This is a cross-sectional view of the magnetic core 20 along the plane of the first direction D1. The magnetic core 20 is non-segmented and has a ring shape with end faces 21 and 22. A through hole 23 is formed in the magnetic core 20. The through hole 23 is a through hole extending from the opening 24 formed on the first end face 21 of the magnetic core 20 to the opening 25 formed on the second end face 22. The magnetic core 20 can be made of soft ferrite as a soft magnetic material or nanocrystalline soft magnetic material with fine metal as the main component. For example, FINEMET (registered trademark) can be used as a nanocrystalline soft magnetic material.

[0049] Next, the structure of the retaining part 60 will be explained. For example... Figure 4 , Figure 5 , Figure 6As shown, the retaining part 60 is a component that holds the connecting terminals 40 and 50 inside the through hole 23 of the magnetic core 20. The retaining part 60 has a receiving part 61 for accommodating the connecting terminals 40 and 50 and a set of locking parts 65a and 65b.

[0050] The receiving portion 61 is a container that houses the connecting terminals 40 and 50 arranged along the second direction D2. Specifically, a receiving space 611 for accommodating the connecting terminals 40 and 50 is formed inside the receiving portion 61. Figure 6 As shown, the accommodating space 611 exists within the accommodating portion 61 such that it extends from an opening 613 formed at a first end in the first direction D1 to an opening 615 formed at a second end. Figure 6 As shown, the accommodating space 612 exists within the accommodating portion 61 in such a way that it extends from the opening 614 formed at the first end in the first direction D1 to the opening 616 formed at the second end.

[0051] In this embodiment, the receiving portion 61 includes a container body 62, a first cover portion 63, and a second cover portion 64. The receiving portion 61 is constructed by assembling the container body 62, the first cover portion 63, and the second cover portion 64. Figure 7 This is a cross-sectional view of the container body 62 on a plane parallel to the second direction D2 and the third direction D3. Figure 8 This is a cross-sectional view of the first cover portion 63 on a surface parallel to the second direction D2 and the third direction D3. Figure 9 This is a cross-sectional view of the second cover portion 64 on a surface parallel to the second direction D2 and the third direction D3.

[0052] like Figure 5 As shown, the container body 62 has: a partition wall portion 621, which is rectangular; and side wall portions 622 and 623, provided at both ends of the partition wall portion 621 in a third direction D3. Specifically, the side wall portions 622 and 623 extend from both ends of the partition wall portion 621 in the third direction D3 along a second direction D2, and their cross-section in the plane defined by the second direction D2 and the third direction D3 is approximately H-shaped. That is, as... Figure 7 As shown, a first recess 66 is formed in the container body 62, with the first surface of the spacer wall portion 621 in the third direction D3 serving as the bottom surface 621a. Furthermore, a second recess 67 is formed in the container body 62, with the second surface of the spacer wall portion 621 in the third direction D3 serving as the bottom surface 621b. A retaining protrusion 625 protruding in the second direction D2 is provided on the bottom surface 621a of the spacer wall portion 621, and a retaining protrusion 626 protruding in the second direction D2 is provided on the bottom surface 621b. The container body 62 is non-conductive and is formed, for example, from polyamide resin.

[0053] like Figure 8As shown, the first cover portion 63 has: a rectangular base 631; and sidewall portions 632 and 633 extending at both ends in a third direction D3 from the base 631. A retaining protrusion 635 protruding in a second direction D2 is provided inside the base 631, opposite to the container body 62. The first cover portion 63 is non-conductive, for example, formed of polyamide resin. Figure 5 , Figure 6 As shown, at one end of the first cover portion 63 in the first direction D1, a flange 634 is formed that protrudes outward from the base portion 631 and the sidewall portions 632, 633.

[0054] like Figure 9 As shown, the second cover 64 has: a rectangular base 641; and sidewalls 642 and 643 extending at both ends in a third direction D3 from the base 641. A retaining protrusion 645 protruding in a second direction D2 is provided inside the base 641, opposite to the container body 62. Figure 5 , Figure 6 As shown, a flange 644 is formed at one end of the second cover portion 64 in the first direction D1, protruding outward from the base portion 641 and the sidewall portions 642, 643. The second cover portion 64 is non-conductive and is formed, for example, from polyamide resin.

[0055] like Figure 4 and Figure 5 As shown, locking portion 65a is formed at the end of the first cover portion 63 in the first direction D1. Furthermore, locking portion 65b is formed at the end of the second cover portion 64 in the first direction D1. Specifically, locking portions 65a and 65b are formed at the ends opposite to the ends in the first direction D1 where flanges 634 and 644 are formed in the first cover portion 63 and the second cover portion 64, respectively. In this embodiment, locking portions 65a and 65b are formed by cutting off the edges of base portions 631 and 641 in the first direction D1, thus constituting claw portions that are elastic in the second direction D2.

[0056] Next, the configuration of connecting terminals 40 and 50 will be explained. For example... Figure 2 As shown, connection terminals 40 and 50 are terminals that allow busbars 101 to 104 to be connected by inserting into the insertion portions 101c to 104c of each busbar 101 to 104. Connection terminal 40 is inserted into the insertion portions 101c and 102c of busbars 101 and 102, and connection terminal 50 is inserted into the insertion portions 103c and 104c of busbars 103 and 104. Connection terminals 40 and 50 are formed of conductive components such as copper, and preferably of elastic materials such as phosphor bronze.

[0057] like Figure 5 , Figure 10As shown, the connecting terminal 40 has a first connecting portion 41, a second connecting portion 42, and a retaining portion 43. The retaining portion 43 is a cuboid-shaped portion located between the first connecting portion 41 and the second connecting portion 42, and opening in the first direction D1. Figure 10 As shown, the holding portion 43 has holding surfaces 43a and 43b that are mutually parallel surfaces facing the second direction D2. Among the holding surfaces 43a and 43b, a holding hole 48 is formed in holding surface 43a, and a holding hole 49 is formed in holding surface 43b. It should be noted that... Figure 10 In the diagram, retaining holes 48 and 49 are shown in dashed lines. When assembling the receiving part 61, the retaining protrusion 635 of the first cover part 63 is inserted into the retaining hole 48, and the retaining protrusion 625 of the container body 62 is inserted into the retaining hole 49.

[0058] like Figure 5 As shown, the first connecting portion 41 has three pairs of elastic sheets 44 and 45. Figure 10 As shown, elastic sheets 44 and 45 extend from the first edge of the held portion 43 in the first direction D1, and cooperate to grip the busbar 103. The elastic sheets 44 and 45 are thin plate-shaped and have elasticity in the direction of gripping the busbar 103 (i.e., the second direction D2). Elastic sheet 44 extends from the first edge of the holding surface 43a, and elastic sheet 45 extends from the first edge of the holding surface 43b. Elastic sheets 45 and 46 form a pair and grip the busbar. In this embodiment, three pairs of elastic sheets 44 and 45 are arranged in the third direction D3 from the held portion 43 to serve as the first connecting portion 41.

[0059] like Figure 5 As shown, the second connecting portion 42 has three pairs of elastic sheets 46 and 47. Figure 10 As shown, elastic sheets 46 and 47 extend from the first edge of the held portion 43 in the first direction D1, and cooperate to grip the busbar 104. The elastic sheets 46 and 47 are thin plate-shaped and have elasticity in the direction of gripping the busbar 104 (i.e., the second direction D2). Elastic sheet 46 extends from the second edge of the holding surface 43a, and elastic sheet 47 extends from the second edge of the holding surface 43b. Elastic sheets 46 and 47 form a pair and grip the busbar. In this embodiment, three pairs of elastic sheets 46 and 47 are arranged in the third direction D3 from the held portion 43 to serve as the second connecting portion 42.

[0060] like Figure 5 , Figure 11As shown, the connecting terminal 50 has a first connecting portion 51, a second connecting portion 52, and a retaining portion 53. In this embodiment, the connecting terminal 50 has the same shape as the connecting terminal 40. That is, the retaining portion 53 is a cuboid-shaped portion located between the first connecting portion 51 and the second connecting portion 52, and opening in the first direction D1. Figure 11 As shown, the holding portion 53 has holding surfaces 53a and 53b that are parallel to each other and face the second direction D2. Among the holding surfaces 53a and 53b, a holding hole 58 is formed in holding surface 53a, and a holding hole 59 is formed in holding surface 53b. It should be noted that... Figure 11 In the diagram, retaining holes 58 and 59 are shown in dashed lines. When assembling the receiving part 61, the retaining protrusion 645 of the second cover part 64 is inserted into the retaining hole 58, and the retaining protrusion 625 of the container body 62 is inserted into the retaining hole 59.

[0061] like Figure 5 As shown, the first connecting portion 51 has three pairs of elastic sheets 54 and 55. Figure 11 As shown, elastic sheets 54 and 55 extend from the first edge of the held portion 53 in the first direction D1, and cooperate to grip the busbar 101. The elastic sheets 54 and 55 are thin plate-shaped and have elasticity in the direction of gripping the busbar 101 (i.e., the second direction D2). An elastic sheet 54 extends from the first edge of the holding surface 53a, and an elastic sheet 55 extends from the first edge of the holding surface 53b. The elastic sheets 55 and 56 form a pair and grip the busbar. In this embodiment, three pairs of elastic sheets 54 and 55 are arranged in the third direction D3 from the held portion 53 to serve as the first connecting portion 51.

[0062] like Figure 5 As shown, the second connecting portion 52 has three pairs of elastic sheets 56 and 57. Figure 11 As shown, elastic sheets 56 and 57 extend from the second edge of the held portion 53 in the first direction D1 and are configured to cooperate in gripping the busbar 102. The elastic sheets 56 and 57 are thin plate-shaped and have elasticity in the direction of gripping the busbar 102 (i.e., the second direction D2). Elastic sheet 56 extends from the second edge of the holding surface 53a, and elastic sheet 57 extends from the second edge of the holding surface 53b. Elastic sheets 56 and 57 form a pair and grip the busbar. In this embodiment, three pairs of elastic sheets 56 and 57 are arranged in the third direction D3 from the held portion 53 to serve as the second connecting portion 52.

[0063] [1-2. Assembly Process]

[0064] Next, use Figure 5 , Figure 6 The assembly process of the noise filter 10 is explained.

[0065] First, with the connecting terminal 40 accommodated in the first recess 66 of the container body 62, the first cover 63 is fitted into the opening side of the first recess 66 of the container body 62. This forms a receiving space 611 for accommodating the connecting terminal 40 through the inside of the first recess 66 and the inside of the first cover 63. At this time, in the connecting terminal 40, the retaining protrusion 625 of the container body 62 is inserted into the retaining hole 49 of the retaining portion 43, and the retaining protrusion 635 of the first cover 63 is inserted into the retaining hole 48 of the retaining portion 43. Thus, the connecting terminal 40 is held in the receiving space 611 of the receiving portion 61 with the first connecting portion 41 facing the opening 613 and the second connecting portion 42 facing the opening 615 in the first direction D1. Furthermore, the connecting terminal 40 is held in the receiving space 611 with its movement in the first direction D1 restricted by the retaining protrusions 625 and 635 protruding in the second direction D2.

[0066] In the receiving portion 61, with the connecting terminal 50 housed in the second recess 67 of the container body 62, the second cover portion 64 is fitted into the opening side of the second recess 67 of the container body 62. Thus, a receiving space 612 for accommodating the connecting terminal 50 is formed through the inner side of the second recess 67 and the inner side of the second cover portion 64. At this time, in the connecting terminal 50, the retaining protrusion 626 of the container body 62 is inserted into the retaining hole 59 of the retaining portion 53, and the retaining protrusion 645 of the second cover portion 64 is inserted into the retaining hole 58 of the retaining portion 53. Thus, the connecting terminal 50 is held in the receiving space 612 of the receiving portion 61 with the first connecting portion 51 facing the opening 614 and the second connecting portion 52 facing the opening 616 in the first direction D1. Furthermore, the connecting terminal 50 is held in the receiving space 612 with its movement in the first direction D1 restricted by the retaining protrusions 626 and 645 protruding in the second direction D2.

[0067] Then, the receiving portion 61 is inserted into the through hole 23 of the magnetic core 20 from the side where the locking portion 65 is formed. At this time, the locking portion 65, passing through the through hole 23, engages with the edge of the opening 24 of the through hole 23, thereby locking the receiving portion 61 into the magnetic core 20. That is, the receiving portion 61 is reliably held in the through hole 23 of the magnetic core 20 by means of the locking portion 65. In addition, the flanges 634 and 644 of the receiving portion 61 abut against the edge of the opening 25 of the magnetic core 20, thereby restricting the insertion of the receiving portion 61.

[0068] Next, the process of connecting the busbars using the noise filter 10 will be explained.

[0069] The insertion portion 101c of busbar 101 is inserted from the opening 613 of the receiving portion 61 into the space between the elastic pieces 44 and 45 of the first connecting portion 41, and the insertion portion 102c of busbar 102 is inserted from the opening 615 of the receiving portion 61 into the space between the elastic pieces 46 and 47 of the second connecting portion 42. Thus, busbar 101 and busbar 102 are connected by a connecting terminal 40 disposed within the through hole 23 of the magnetic core 20.

[0070] The insertion portion 103c of busbar 103 is inserted from the opening 614 of the receiving portion 61 into the space between the elastic pieces 54 and 55 of the first connecting portion 51, and the insertion portion 102c of busbar 104 is inserted from the opening 616 of the receiving portion 61 into the space between the elastic pieces 56 and 57 of the second connecting portion 52. Thus, busbar 103 and busbar 104 are connected by a connecting terminal 50 disposed within the through hole 23 of the magnetic core 20.

[0071] Here, the insertion portions 101c to 104c of busbars 101 to 104 are held by the first connecting portion 41 and the second connecting portion 42, which serve as elastic sheets. This allows them to move in a direction parallel to the plane of the insertion portions 101c to 104c while maintaining electrical contact with the connecting terminals 40 and 50. Similarly, busbars 101 to 104 can also move in the direction held by the elastic sheets 44 to 47 and 54 to 57 (i.e., the second direction D2), accompanied by the displacement of the elastic sheets. Therefore, even if some positional shift occurs between busbars 101 and 103 held by the first connecting portions 41 and 51 and busbars 102 and 104 held by the second connecting portions 42 and 52, the busbars can be connected while absorbing this shift.

[0072] [1-3. Effects]

[0073] The above-described implementation method can achieve the following effects.

[0074] (1a) The noise filter 10 has a holding portion 60, which holds the connecting terminals 40 and 50 in the through hole 23 such that the first connecting portions 41 and 51 are facing the first opening from the inside of the through hole 23 of the magnetic core 20 and the second connecting portions 42 and 52 are facing the second opening from the inside of the through hole 23.

[0075] Thus, in the two busbars, the first busbar can be connected through the first connecting portion 41 exposed from the first opening of the through hole 23 of the magnetic core 20, and the second busbar can be connected through the second connecting portion 42 exposed from the second opening of the through hole 23. This allows the two busbars to be electrically connected. Therefore, regardless of the curvature of the busbars, the signal flowing through the first busbar can flow through the through hole 23 of the magnetic core 20 to the second busbar. As a result, the freedom of shape of the busbars within the device can be increased, and the noise reduction effect of the noise filter 10 is less likely to be reduced.

[0076] (1b) The holding portion 60 of the noise filter 10 has a receiving portion 61 disposed inside the through hole 23, and the receiving portion 61 accommodates the connecting terminals 40 and 50, thereby holding the connecting terminals 40 and 50 in the magnetic core 20.

[0077] Therefore, the connection terminals can be held within the through hole while ensuring the insulation between the connection terminals 40, 50 and the magnetic core 20. This allows for proper signal transmission between busbars and minimizes the noise reduction effect of the noise filter 10.

[0078] (1c) The retaining part 60 is disposed inside the through hole 23 and has a locking part 65 that locks the retaining part 60 to the magnetic core 20.

[0079] Therefore, by increasing the holding force of the retaining part 60 on the magnetic core, the connecting terminals 40 and 50 can be reliably positioned on the magnetic core 20. For example, even when an external force is applied to the connecting terminals 40 and 50 via the busbar, it is possible to prevent the connecting terminals 40 and 50 from being pulled outward from the through hole 23 of the magnetic core 20, and to suppress the reduction of the noise reduction effect of the noise filter 10.

[0080] [1-4. Variations of the first embodiment]

[0081] (1d)

[0082] In the first embodiment described above, the connecting terminals 40 and 50 have retaining holes formed in the retaining portions 43 and 53, and the receiving portion 61 has retaining protrusions that are inserted into the retaining holes. Alternatively, the connecting terminals 40 and 50 may have retaining protrusions in the retaining portions 43 and 53, and the receiving portion 61 may have retaining holes.

[0083] (1e) In the first embodiment described above, the retaining part 60 includes locking parts 65a and 65b. Alternatively, the retaining part 60 may not include locking parts 65a and 65b. Furthermore, the retaining part 60 may be configured to include one locking part instead of having two locking parts 65a and 65b.

[0084] [2. Second Implementation]

[0085] In the second embodiment, the configuration that differs from that in the first embodiment will be described. It should be noted that the same reference numerals are used for the same parts in the second embodiment as in the first embodiment, and their descriptions will not be repeated.

[0086] [2-1. Composition]

[0087] In this embodiment, such as Figure 12 As shown, the noise filter 10 includes a housing 70 that accommodates the magnetic core 20. Furthermore, a retaining portion for holding the connecting terminal is integrally formed with the housing 70. Figure 13 This is a cross-sectional view of the noise filter 10 of this embodiment on a plane parallel to the first direction D1. Figure 14 This is a cross-sectional view of the noise filter 10 of this embodiment on a plane parallel to the second direction D2.

[0088] like Figure 13 , Figure 14 As shown, the housing 70 includes a housing body 71 and a cover 72. The housing 70 is formed of a non-conductive resin, for example, polyamide resin can be used as the material. The housing body 71 has an outer cylindrical portion 711, a through cylindrical portion 712, a bottom surface 713, and a partition wall 714. The outer cylindrical portion 711 is a cylindrical portion extending from a first surface of the bottom surface 713 in a first direction D1. An opening is provided at one end of the outer cylindrical portion 711 opposite to the bottom surface 713. The through cylindrical portion 712 is a cylindrical portion extending from the first surface of the bottom surface 713 inside the outer cylindrical portion 711 in the same direction as the extending direction of the outer cylindrical portion 711. Specifically, the outer diameter of the through cylindrical portion 712 is smaller than the outer diameter of the outer cylindrical portion 711. Thus, a receiving space 715 for receiving the magnetic core 20 is formed between the inner circumferential surface of the outer cylindrical portion 711 and the outer circumferential surface of the through cylindrical portion 712.

[0089] like Figure 14 As shown, the partition wall 714 is a plate-shaped portion that extends through the interior of the cylindrical portion 712. As a result, two terminal receiving spaces divided by the partition wall 714 are formed on the inner side of the cylindrical portion 712.

[0090] The cover 72 is an annular member with an opening in the center. The cover 72 is fitted to the housing body 71 at the end opposite to the bottom surface 713 of the housing body 71 so as to cover the opening of the receiving space 715 formed between the outer cylindrical part 711 and the through cylindrical part 712.

[0091] A retaining portion 160 is integrally formed in the housing 70. In this embodiment, the retaining portion 160 is respectively provided in two terminal receiving spaces divided by the partition wall 714 inside the through cylindrical portion 712. Specifically, the retaining portion 160 has an extending mounting piece 161 and a locking piece 162. The extending mounting piece 161 is a sheet-like portion extending inward from the inner peripheral surface of the through cylindrical portion 712. The locking piece 162 is a portion extending from the extending mounting piece 161 along a first direction D1 and having a claw-like front end. Specifically, the locking piece 162 protrudes from the top end of the extending mounting piece 161 at a position on the inner peripheral surface side in a third direction D3 by a predetermined size. The retaining portion 160 configured as described above is capable of clamping the retained portions 43 and 53 of the connecting terminals 40 and 50 between the top end of the locking piece 162 and the top end of the extending mounting piece 161.

[0092] In the housing 70 configured as described above, the magnetic core 20 is housed within the housing space 715, with the through-hole 23 penetrating through the through-tube portion 712. Connecting terminals 40 and 50 are respectively housed and held in the holding portion 160 within two terminal housing spaces divided by the partition wall 714 inside the through-tube portion 712. In this embodiment, the connecting terminals 40 and 50 are also held in place by the holding portion 160 with the connecting portions 41, 42, 51, and 52 facing the first direction D1. In this embodiment, the through-tube portion 712 is an example of a through-hole.

[0093] [2-2. Effect]

[0094] (2a) In the embodiment described above, the noise filter 10 houses a magnetic core 20 and has a housing 70 formed of non-conductive resin. The housing 70 has a cylindrical through-hole 712, through which the magnetic core 20 is housed. Each connecting terminal 40, 50 is disposed inside the through-hole 712.

[0095] Therefore, the noise filter 10 with housing 70 can also achieve the same effect as the first embodiment.

[0096] (2b) The retaining part 160 is disposed inside the through hole 23 of the magnetic core 20 and is integrally formed with the housing 70.

[0097] Therefore, the noise filter with housing 70 can achieve the same effect as the first embodiment, and can suppress the increase in the number of components.

[0098] [2-3. Variations of the Second Embodiment]

[0099] (2c) In the second embodiment described above, the retaining portion 160 integrally formed with the housing 70 has an extending fitting 161 and a locking fitting 162. Alternatively, a retaining protrusion may be formed on the inner circumferential surface of the through-tube portion 712 of the housing 70 as the retaining portion 160, which is inserted into the retaining hole of the retained portion provided in the connecting terminals 40, 50. In this case, the connecting terminals 40, 50 disposed inside the through-tube portion 712 are held in a state in which the retaining protrusion of the retaining member is inserted into the retaining hole formed in the retained portion.

[0100] (2d) The retaining part 160 holds the connecting terminals 40 and 50 inside the through hole 23 of the magnetic core 20. Alternatively, the retaining part 160 may be integrally formed on the housing 70 and hold the connecting terminals 40 and 50 from the outside of the through hole 23.

[0101] [3. Other Implementation Methods]

[0102] The technology disclosed in this specification is not limited to the above-described embodiments and can be modified in various ways without departing from its spirit, for example, the following modifications can also be made.

[0103] (3a) In the above embodiments, two connecting terminals 40 and 50 are held in the through hole 23 of the magnetic core 20 by the holding part 60. Alternatively, one connecting terminal may be held in the through hole 23 of the magnetic core 20 by the holding part 60.

[0104] (3b) In the above embodiments, the first connecting portions 41 and 42, and the second connecting portions 51 and 52 of the connecting terminals 40 and 50 are constituted by a pair of elastic pieces that grip both sides of the busbar. The first connecting portions 41 and 42, and the second connecting portions 51 and 52 are not limited to the pair of elastic pieces described above, as long as they can hold the insertion portion of the busbar. For example, the first connecting portions 41 and 42, and the second connecting portions 51 and 52 may be constituted by insertion grooves into which the insertion portion of the busbar is inserted, thereby holding the insertion portion of the busbar.

Claims

1. A noise filter, comprising: A non-segmented magnetic core is formed with a through hole having a first opening and a second opening at both ends; A conductive connecting terminal is disposed inside the through hole and has a first connecting portion and a second connecting portion at both ends for connection to a busbar; and The retaining part holds the connecting terminal disposed inside the through hole. in, The connecting terminal is held in the magnetic core by the holding portion when the first connecting portion is facing the first opening from the inside of the through hole and the second connecting portion is facing the second opening from the inside of the through hole.

2. The noise filter according to claim 1, comprising: The housing, which contains the magnetic core, is formed of non-conductive resin. in, The housing has a cylindrical through-hole, which houses the magnetic core. The connecting terminal is disposed inside the through portion.

3. The noise filter according to claim 1 or 2, wherein, The retaining portion has a receiving portion disposed inside the through hole, and the connecting terminal disposed inside the through hole is retained by the receiving portion accommodating the connecting terminal.

4. The noise filter according to any one of claims 1 to 3, wherein, The retaining part is disposed inside the through hole and has a locking part that locks the retaining part into the magnetic core.

5. The noise filter according to claim 2 or 3, comprising: The housing, which contains the magnetic core, is formed of non-conductive resin. in, The retaining part is disposed inside the through hole and is integrally formed with the housing.

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