Noise filter and wire harness

Abstract

To provide a noise filter and a wire harness that can adjust the target frequency of noise reduction while keeping costs down.SOLUTION: A noise filter includes a first terminal 30 fixed to an end of a first electric wire 10, a second terminal 40 fixed to an end of a second electric wire 20, and a housing 50 that houses the first terminal 30 and the second terminal 40. The first terminal 30 includes an attachment portion 31 that is attached to a core wire 11 of the first electric wire 10 and an extension portion 32 that extends from the attachment portion 31. The second terminal 40 includes an attachment portion 41 that is attached to a core wire 21 of the second electric wire 20, and an extension portion 42 that extends from the attachment portion 41. The housing 50 houses the first terminal 30 and the second terminal 40 such that the extension portion 32 of the first terminal 30 and the extension portion 42 of the second terminal 40 are arranged side by side with a gap G between them, and the housing 50 is provided with an adjustment mechanism 60 that adjusts the gap G between the extension portion 32 of the first terminal 30 and the extension portion 42 of the second terminal 40.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a noise filter and a wire harness. [Background technology]

[0002] Patent Document 1 discloses a noise filter that reduces electrical noise by interposing a filter circuit equipped with a noise reduction element such as a capacitor or a coil between an intermediate connection portion of a first electric wire and an intermediate connection portion of a second electric wire, sandwiching and pressing the first electric wire and the second electric wire in the arrangement direction between a first pressing body and a second pressing body of a housing, and electrically connecting the filter circuit to each intermediate connection portion. This noise filter eliminates the need for an intermediate electric wire connecting the electric wires and the filter circuit, and can suppress noise generated by the intermediate electric wire. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-48075 Summary of the Invention [Problem to be solved by the invention]

[0004] However, since capacitors used as noise reduction elements in filter circuits have a rated capacitance, it is difficult to deal with noise that deviates from a certain frequency component. Furthermore, in noise filters that include filter circuits, the use of noise reduction elements such as capacitors increases costs.

[0005] The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a noise filter and a wire harness that are capable of adjusting the target frequency of noise to be reduced while suppressing costs. [Means for solving the problem]

[0006] The above object of the present invention can be achieved by the following configuration. a first terminal fixed to an end of the first electric wire; a second terminal fixed to an end of the second electric wire; a housing that accommodates the first terminal and the second terminal; Equipped with the first terminal has an attachment portion attached to a core wire of the first electric wire and an extension portion extending from the attachment portion, the second terminal has an attachment portion attached to a core wire of the second electric wire and an extension portion extending from the attachment portion, the housing accommodates the first terminal and the second terminal such that the extension portion of the first terminal and the extension portion of the second terminal are juxtaposed with a gap between them; The noise filter, wherein the housing includes an adjustment mechanism that adjusts the distance between the extension portion of the first terminal and the extension portion of the second terminal. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a noise filter and a wire harness that are capable of adjusting the target frequency of noise to be reduced while suppressing costs.

[0008] The present invention has been briefly described above. The details of the present invention will become clearer by reading the following detailed description of the invention (hereinafter referred to as "embodiments") with reference to the accompanying drawings. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a noise filter according to a first embodiment. [Figure 2] FIG. 2 is a longitudinal cross-sectional view of the noise filter according to the first embodiment taken along the longitudinal direction. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along the longitudinal direction of the noise filter according to the second embodiment. [Figure 5] FIG. 5 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 7 is a cross-sectional view of the wedge member when the screw member is viewed from the side. [Figure 8] FIG. 8 is a top view of the wedge member. [Figure 9] FIG. 9 is a front view of the wedge member. [Figure 10] FIG. 10 is a cross-sectional view taken along the longitudinal direction of the noise filter according to the third embodiment. [Figure 11] FIG. 11 is a cross-sectional view taken along line XI-XI in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0011] (First embodiment) First, the first embodiment will be described. Fig. 1 is a perspective view of a noise filter 100 according to a first embodiment. Fig. 2 is a longitudinal cross-sectional view of the noise filter 100 according to the first embodiment, taken along the longitudinal direction. Fig. 3 is a cross-sectional view taken along the line III-III in Fig. 2.

[0012] As shown in FIGS. 1 to 3, a noise filter 100 according to the first embodiment is provided in a wire harness WH. The wire harness WH includes a first electric wire 10 and a second electric wire 20, and is installed in a vehicle such as an automobile. For example, the first electric wire 10 is a signal wire or a power wire, and the second electric wire 20 is a ground wire. The first electric wire 10 is an insulated electric wire in which a core wire 11 made of a conductor is covered with an outer sheath 12. Similarly, the second electric wire 20 is an insulated electric wire in which a core wire 21 made of a conductor is covered with an outer sheath 22.

[0013] The noise filter 100 includes a first terminal 30, a second terminal 40, and a housing 50.

[0014] The first terminal 30 is made of a conductive metal material such as copper or a copper alloy, and is fixed to the end of the first electric wire 10. The first terminal 30 has an attachment portion 31 and an extension portion 32. The first terminal 30 is attached by, for example, crimping the attachment portion 31 to the core wire 11 exposed at the end of the first electric wire 10. In this way, the first terminal 30 is electrically connected to the core wire 11 of the first electric wire 10. The extension portion 32 of the first terminal 30 is formed in a plate shape and extends from the attachment portion 31.

[0015] Like the first terminal 30, the second terminal 40 is made of a conductive metal material such as copper or a copper alloy, and is fixed to the end of the second electric wire 20. The second terminal 40 has an attachment portion 41 and an extension portion 42. The second terminal 40 is attached by, for example, crimping the attachment portion 41 to the core wire 21 exposed at the end of the second electric wire 20. In this way, the second terminal 40 is electrically connected to the core wire 21 of the second electric wire 20. The extension portion 42 of the second terminal 40 is formed in a plate shape and extends from the attachment portion 41.

[0016] The housing 50 is made of an insulating resin material. The housing 50 has a first housing section 51 and a second housing section 52. In the housing 50, the first housing section 51 is provided above the second housing section 52. The first housing section 51 opens at one end of the housing 50, and the second housing section 52 opens at the other end of the housing 50. The first housing section 51 and the second housing section 52 are connected to each other at the center of the housing 50 in the longitudinal direction.

[0017] In the housing 50, the first terminal 30 is inserted and housed in the first housing portion 51, and the second terminal 40 is inserted and housed in the second housing portion 52. The first terminal 30 and the second terminal 40 housed in the housing 50 are arranged side by side with their respective extension portions 32, 42 spaced apart by a gap G in the longitudinal center of the housing 50 where the first housing portion 51 and the second housing portion 52 are connected. The portion where the extension portions 32, 42 are arranged side by side with the gap G between them constitutes a capacitor, which reduces high-frequency noise components in the current flowing through the first electric wire 10. In other words, in the noise filter 100, the portion where the extension portions 32, 42 are arranged side by side with the gap G between them to form a capacitor serves as a filter that reduces noise.

[0018] The housing 50 also includes an adjustment mechanism 60. The adjustment mechanism 60 is made up of a screw member 61, which is screwed into a screw hole 62 formed in the housing 50. The screw hole 62 is formed in the upper part of the center in the longitudinal direction of the housing 50. The tip of the screw member 61 screwed into the screw hole 62 abuts against the extension portion 32 of the first terminal 30 housed in the first housing portion 51. When the screw member 61 is rotated, it advances and retreats along the arrangement direction of the extension portions 32, 42 of the first terminal 30 and the second terminal 40.

[0019] In this adjustment mechanism 60, when the screw member 61 is screwed in, the extension portion 32 of the first terminal 30 is pressed by the tip of the screw member 61 and elastically deforms, displacing in a direction approaching the extension portion 42 of the second terminal 40 (the direction of arrow D1 in FIG. 2 ). When the screw member 61 is loosened, the extension portion 32 of the first terminal 30 returns to its original shape and displaces in a direction away from the extension portion 42 of the second terminal 40 (the direction of arrow D2 in FIG. 2 ). In this way, in the noise filter 100 equipped with the adjustment mechanism 60, the interval G between the extension portion 32 of the first terminal 30 and the extension portion 42 of the second terminal 40 is adjusted by rotating the screw member 61. This changes the capacitance of the filter portion in which the extension portions 32, 42 are juxtaposed with the gap G therebetween to form a capacitor, thereby adjusting the target frequency of noise reduction. The target frequency of this noise is adjusted by adjusting the number of rotations and the rotation angle of the screw member 61 while monitoring a measuring instrument such as a spectrum analyzer.

[0020] As described above, according to the noise filter 100 of the first embodiment, by juxtaposing the extension portion 32 of the first terminal 30 and the extension portion 42 of the second terminal 40, it is possible to achieve the function of a filter that reduces noise at low cost without using a noise reduction element such as a capacitor. Moreover, by adjusting the gap G between the extension portion 32 of the first terminal 30 and the extension portion 42 of the second terminal 40 using the adjustment mechanism 60, it is possible to adjust the target frequency of the noise to be reduced. Specifically, by rotating the screw member 61 of the adjustment mechanism 60, the gap G between the extension portions 32, 42 can be adjusted, and the target frequency of the noise to be reduced can be easily adjusted.

[0021] The wire harness WH including the noise filter 100 can provide a filter function at low cost.

[0022] In addition, an insulating sheet such as an insulator may be provided between the extensions 32, 42 that constitute the filter portion of the capacitor, which are arranged side by side with a gap G between them, to prevent short circuits caused by contact between these extensions 32, 42.

[0023] (Second embodiment) Next, a second embodiment will be described. Note that the same components as those in the first embodiment are given the same reference numerals and the description thereof will be omitted.

[0024] Fig. 4 is a cross-sectional view taken along the longitudinal direction of a noise filter 200 according to the second embodiment. Fig. 5 is a cross-sectional view taken along line VV in Fig. 4. Fig. 6 is a cross-sectional view taken along line VI-VI in Fig. 4. Fig. 7 is a cross-sectional view of a wedge member 75, in which a screw member 71 is viewed from the side. Fig. 8 is a top view of the wedge member 75. Fig. 9 is a front view of the wedge member 75.

[0025] As shown in FIGS. 4 to 6 , the noise filter 200 according to the second embodiment includes an adjustment mechanism 70. The adjustment mechanism 70 has a screw member 71 equipped with a wedge member 75. The screw member 71 is threadedly engaged with a threaded hole 72 formed in the housing 50. The threaded hole 72 is formed in a side portion of the housing 50 at the center in the longitudinal direction. The wedge member 75 is attached to the tip of the screw member 71 and is disposed in the second accommodating portion 52 of the housing 50 at a side portion of the extension portion 42 of the second terminal 40. When the screw member 71 is rotated, the wedge member 75 advances and retreats in a direction perpendicular to the arrangement direction of the extension portions 32, 42 of the first terminal 30 and the second terminal 40.

[0026] 7 to 9, wedge member 75 has a cross-sectional shape that gradually narrows toward the tip. Wedge member 75 has a locking portion 76 having a locking piece 76a formed at its rear end, and the tip of screw member 71 is locked to this locking portion 76. Screw member 71 has a locking groove 71a at its tip, and locking piece 76a formed on locking portion 76 of wedge member 75 is locked to this locking groove 71a. As a result, wedge member 75 is attached to the tip of screw member 71 in a state where it can rotate freely when screw member 71 rotates.

[0027] In this adjustment mechanism 70, when the screw member 71 is screwed in, the wedge member 75 is inserted into the side of the extension portion 42 of the second terminal 40 in the second accommodating portion 52. As a result, the extension portion 42 of the second terminal 40 is pressed by the wedge member 75 and elastically deformed, and is displaced in a direction approaching the extension portion 32 of the first terminal 30 (the direction of arrow D3 in FIG. 6). Furthermore, when the screw member 71 is loosened, the wedge member 75 is pulled out from the side of the extension portion 42 of the second terminal 40 in the second accommodating portion 52. As a result, the extension portion 42 of the second terminal 40 returns to its original state and is displaced in a direction away from the extension portion 32 of the first terminal 30 (the direction of arrow D4 in FIG. 6). In this way, in noise filter 200 equipped with adjustment mechanism 70, the gap G between extension portion 32 of first terminal 30 and extension portion 42 of second terminal 40 is adjusted by rotating screw member 71 to move wedge member 75. This changes the capacitance of the filter portion where extension portions 32, 42 are juxtaposed with gap G between them to form a capacitor, and adjusts the target frequency of noise to be reduced.

[0028] Thus, according to the noise filter 200 of the second embodiment, by rotating the screw member 71 of the adjustment mechanism 70 and moving the wedge member 75, the distance G between the extension portions 32, 42 can be adjusted, and the target frequency of the noise to be reduced can be easily adjusted.

[0029] (Third embodiment) Next, a third embodiment will be described. Note that the same components as those in the first and second embodiments are denoted by the same reference numerals and the description thereof will be omitted.

[0030] Fig. 10 is a cross-sectional view taken along the longitudinal direction of a noise filter 300 according to the third embodiment. Fig. 11 is a cross-sectional view taken along the line XI-XI in Fig. 10.

[0031] 10 and 11 , in a noise filter 300 according to the third embodiment, a first accommodating portion 51 and a second accommodating portion 52 are open on one side of the housing 50. The first terminal 30 and the second terminal 40 are inserted into the first accommodating portion 51 and the second accommodating portion 52 from one side of the housing 50 and accommodated therein. The first accommodating portion 51 and the second accommodating portion 52 have bus bar accommodating portions 51 a and 52 a, respectively. These bus bar accommodating portions 51 a and 52 a extend upward in the housing 50 and are connected to each other at the center of the housing 50 in the longitudinal direction.

[0032] In the noise filter 300, the first terminal 30 and the second terminal 40 each have a bus bar 35, 45. The bus bars 35, 45 are made of a conductive metal plate material such as copper or a copper alloy, and are bent into an L shape.

[0033] The bus bar 35 has a fixed portion 35a and an extending portion 35b, and the fixed portion 35a is fixed to the first terminal 30 by a screw 36. This electrically connects the bus bar 35 to the first terminal 30. Similarly, the bus bar 45 has a fixed portion 45a and an extending portion 45b, and the fixed portion 45a is fixed to the second terminal 40 by a screw 46. This electrically connects the bus bar 45 to the second terminal 40. The extending portion 35b of the bus bar 35 is accommodated in the bus bar accommodating portion 51a of the first accommodating portion 51, and the extending portion 45b of the bus bar 45 is accommodated in the bus bar accommodating portion 52a of the second accommodating portion 52. The extensions 35b and 45b are arranged side by side in the longitudinal center of the housing 50 where the bus bar accommodating portion 51a of the first accommodating portion 51 and the bus bar accommodating portion 52a of the second accommodating portion 52 are connected to each other. The portion where the extensions 35b and 45b are arranged side by side with the gap G therebetween forms a capacitor, and high-frequency noise components of the current flowing through the first electric wire 10 are reduced.

[0034] The housing 50 of the noise filter 300 is provided with an adjustment mechanism 80 consisting of a screw member 81. The screw member 81 is threaded into a threaded hole 82 formed on the other side of the center in the longitudinal direction of the housing 50, and its tip is abutted against the extension portion 45b of the bus bar 45. When the screw member 81 is rotated, it advances and retreats along the arrangement direction of the extension portions 35b, 45b of the bus bars 35, 45.

[0035] In this adjustment mechanism 80, when the screw member 81 is screwed in, the extension portion 45b of the bus bar 45 connected to the second terminal 40 is pressed by the tip of the screw member 81 and elastically deforms, displacing in a direction approaching the extension portion 35b of the bus bar 35 connected to the first terminal 30 (the direction of arrow D5 in FIG. 11 ). When the screw member 81 is loosened, the extension portion 45 of the bus bar 45 connected to the second terminal 40 returns to its original shape and displaces in a direction away from the extension portion 35b of the bus bar 35 connected to the first terminal 30 (the direction of arrow D6 in FIG. 11 ). In this way, in the noise filter 300 equipped with the adjustment mechanism 80, the distance G between the extension portion 35b of the bus bar 35 connected to the first terminal 30 and the extension portion 45b of the bus bar 45 connected to the second terminal 40 is adjusted by rotating the screw member 81. This changes the capacitance of the filter portion where the extensions 35b and 45b are arranged side by side with the gap G therebetween to form a capacitor, thereby adjusting the target frequency of noise to be reduced.

[0036] Thus, according to the noise filter 300 of the third embodiment, by connecting the bus bars 35, 45 to the first terminal 30 and the second terminal 40 and arranging the extension portions 35b, 45b of these bus bars 35, 45 in parallel, it is possible to realize the function of a filter that reduces noise.

[0037] The present invention is not limited to the above-described embodiments, and can be appropriately modified, improved, etc. Furthermore, the material, shape, size, number, location, etc. of each component in the above-described embodiments are arbitrary and not limited as long as they can achieve the present invention.

[0038] Here, the features of the above-described embodiments of the noise filter and the wire harness according to the present invention will be briefly summarized and listed below in [1] to [5]. [1] A first terminal (30) fixed to an end of a first electric wire (10); a second terminal (40) fixed to an end of the second electric wire (20); a housing (50) that houses the first terminal (30) and the second terminal (40); Equipped with The first terminal (30) has an attachment portion (31) that is attached to the core wire (11) of the first electric wire (10) and an extension portion (32) that extends from the attachment portion (31), The second terminal (40) has an attachment portion (41) that is attached to the core wire (21) of the second electric wire (20) and an extension portion (42) that extends from the attachment portion (41), the housing (50) accommodates the first terminal (30) and the second terminal (40) such that the extension portion (32) of the first terminal (30) and the extension portion (42) of the second terminal (40) are juxtaposed with a gap (G) between them; The housing (50) is provided with an adjustment mechanism (60, 70, 80) that adjusts the gap (G) between the extension portion (32) of the first terminal (30) and the extension portion (42) of the second terminal (40).

[0039] According to the noise filter having the configuration [1] above, by juxtaposing the extension of the first terminal and the extension of the second terminal, it is possible to realize the function of a filter that reduces noise at low cost without using a noise reduction element such as a capacitor. Moreover, by adjusting the distance between the extension of the first terminal and the extension of the second terminal using an adjustment mechanism, it is possible to adjust the target frequency of the noise to be reduced.

[0040] [2] The noise filter described in [1] above, wherein the adjustment mechanism (60) is a screw member (61) threaded into a threaded hole (62) of the housing (50), and when the screw member (61) is rotated, it moves back and forth, displacing one of the extension portions (32) in a direction toward or away from the other extension portion (42).

[0041] According to the noise filter having the configuration [2] above, the distance between the extension portions can be adjusted by rotating the screw member, and the target frequency of the noise to be reduced can be easily adjusted.

[0042] [3] The adjustment mechanism (70) has a wedge member (75) assembled to the screw member (71) and arranged on one side of the juxtaposed extension portions (32, 42), The noise filter described in [2] above, wherein the screw member (71) moves back and forth by rotation, and the wedge member (75) moves, thereby displacing one of the extension portions (42) in a direction toward or away from the other extension portion (32).

[0043] According to the noise filter having the configuration [3] above, by rotating the screw member to move the wedge member, the distance between the extension portions can be adjusted, and the target frequency of the noise to be reduced can be easily adjusted.

[0044] [4] The noise filter according to the above [1], wherein bus bars (35, 45) are electrically connected to the first terminal (30) and the second terminal (40), respectively, and the bus bars (35, 45) are provided with extension portions (35b, 45b) that are moved closer to or further away from the bus bars (35, 45) by the adjustment mechanism to adjust the gap G.

[0045] According to the noise filter having the configuration [4] above, by connecting bus bars to the first terminal and the second terminal and arranging the extension portions of these bus bars in parallel, it is possible to realize the function of a filter that reduces noise.

[0046] [5] A wire harness comprising the noise filter (100, 200, 300) according to any one of [1] to [4] above.

[0047] According to the wire harness having the configuration [5] above, a wire harness having a filter function can be provided at low cost. [Explanation of symbols]

[0048] 10 First Wire 11,21 Core wire 20 Second Wire 30 First terminal 31,41 Mounting part 32,42 extension 35,45 bus bar 35b,45b extension part 40 Second terminal 50 cabinets 60,70,80 Adjustment mechanism 61, 71, 81 Screw members 62,72,82 Screw hole 75 Wedge member 100, 200, 300 Noise Filter G interval WH Wire Harness

Claims

1. a first terminal fixed to an end of the first electric wire; a second terminal fixed to an end of the second electric wire; a housing that accommodates the first terminal and the second terminal; Equipped with the first terminal has an attachment portion attached to a core wire of the first electric wire and an extension portion extending from the attachment portion, the second terminal has an attachment portion attached to a core wire of the second electric wire and an extension portion extending from the attachment portion, the housing accommodates the first terminal and the second terminal such that the extension portion of the first terminal and the extension portion of the second terminal are juxtaposed with a gap between them; the housing includes an adjustment mechanism that adjusts the distance between the extension portion of the first terminal and the extension portion of the second terminal; Noise filter.

2. The adjustment mechanism is a screw member that is screwed into a screw hole of the housing, and when the screw member is rotated, it moves forward and backward, thereby displacing one of the extension portions in a direction toward or away from the other extension portion. The noise filter according to claim 1 .

3. The adjustment mechanism includes a wedge member assembled to the screw member and disposed on one side of the juxtaposed extension portion; When the screw member is rotated, it advances and retreats, and the wedge member moves, so that one of the extension portions is displaced in a direction toward or away from the other extension portion. The noise filter according to claim 2 .

4. a bus bar is electrically connected to each of the first terminal and the second terminal, and an extension portion is provided on the bus bar, the extension portion being moved close to or away from the bus bar by the adjustment mechanism to adjust the gap therebetween; The noise filter according to claim 1 .

5. A noise filter comprising the noise filter according to any one of claims 1 to 4. Wire harness.

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