Noise filter device

Abstract

The present invention provides a noise filter device capable of suppressing electrical interference between an input-side conductive circuit and an output-side conductive circuit. The noise filter device (10) comprises: a noise filter (50) connected to the other end of the input-side conductive circuit (41) and the other end of the output-side conductive circuit (42); and a holding member (60) for holding the input-side conductive circuit (41) and the output-side conductive circuit (42). The holding member (60) comprises: a main body (61) mounted on the wire harness (WH) in a manner of surrounding the outer periphery of the wire harness (WH); and a pair of hooking parts (62) formed at both ends of the main body (61) in the circumferential direction, and by hooking on the input-side conductive circuit (41) and the output-side conductive circuit (42), the input-side conductive circuit (41) and the output-side conductive circuit (42) are restricted from approaching each other.

Description

Technical Field

[0001] The invention relates to a noise filtering device. Background Art

[0002] The noise filter of patent document 1 is a structure between two conductive circuits. The noise filter includes a frame, a grounding conductor, a first conductor and a second conductor. The frame accommodates the grounding conductor, the first conductor and the second conductor. The grounding conductor has an electrical contact portion that contacts a conductive member such as a vehicle body. The first conductor is connected to a conductive circuit (for example, a conductive circuit on the input side) introduced through a through hole in one surface of the frame. The second conductor is connected to a conductive circuit (for example, a conductive circuit on the output side) introduced through another through hole in one surface of the frame. The grounding conductor is connected to the first conductor and the second conductor through a capacitor.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2016-208487 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In the noise filter of Patent Document 1, since the conductive circuit on the input side and the conductive circuit on the output side, which are led out from one surface of the frame, are both composed of flexible wires, there is a problem of being laid close to each other. When the conductive circuit on the input side and the conductive circuit on the output side are too close to each other, signal leakage occurs between the two conductive circuits, and there is a problem of generating electrical interference such as crosstalk.

[0008] The present invention has been made based on the above circumstances, and an object of the present invention is to provide a noise filter device capable of suppressing electrical interference between an input-side conductive circuit and an output-side conductive circuit.

[0009] Means for solving problems

[0010] The noise filtering device of the present invention comprises:

[0011] A connector that receives an input-side terminal connected to one end of an input-side conductive circuit having flexibility and an output-side terminal connected to one end of an output-side conductive circuit having flexibility, and is connected to a harness-side conductive circuit constituting a harness;

[0012] a noise filter connected to the other end of the input-side conductive circuit and the other end of the output-side conductive circuit; and

[0013] a holding member that holds the input-side conductive circuit and the output-side conductive circuit,

[0014] The retaining member has:

[0015] a main body portion mounted on the wire harness so as to surround an outer circumference of the wire harness; and

[0016] A pair of hooking parts are formed at both ends of the main body in the circumferential direction, and hook the input-side conductive circuit and the output-side conductive circuit to restrict the input-side conductive circuit from approaching the output-side conductive circuit.

[0017] Effects of the Invention

[0018] The retaining member for retaining the input-side conductive circuit and the output-side conductive circuit of the noise filter device has a main body portion surrounding the wiring harness. Therefore, the retaining member can be stably assembled to the wiring harness. In addition, the retaining member has a pair of hooking portions, which are formed at both ends of the main body portion and hooked on the respective conductive circuits so that the input-side conductive circuit and the output-side conductive circuit are not close to each other. As a result, compared with a structure in which no retaining member is provided, the noise filter device can increase the distance between the input-side conductive circuit and the output-side conductive circuit, and can suppress electrical interference such as crosstalk between the two conductive circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a perspective view showing a state where the noise filter device of the first embodiment is assembled to a wire harness.

[0020] Figure 2 yes Figure 1 A top view of the retaining member.

[0021] Figure 3 This is a perspective view showing a state in which the holding member of the second embodiment is assembled to the wire harness, the input-side conductive circuit, and the output-side conductive circuit.

[0022] Figure 4 yes Figure 3 A top view of the retaining member. DETAILED DESCRIPTION

[0023] In the present invention, the holding member may have elasticity for urging the input-side conductive circuit and the output-side conductive circuit in directions to separate from each other.

[0024] According to this structure, the input side conductive circuit and the output side conductive circuit are elastically pulled in the direction of separation from the other conductive circuit by the holding member. Therefore, the two conductive circuits can maintain the state of being urged in the direction of separation from the other conductive circuit and can be separated from the other conductive circuit more easily.

[0025] In the present invention, the main body may be composed of a long strip-shaped member, and the pair of hook portions may be respectively wound around the input-side conductive circuit and the output-side conductive circuit.

[0026] According to this structure, the main body is formed by a long strip-shaped member, so that the holding member can be in a simple form. On this basis, a pair of hooking parts are respectively wound around the input side conductive circuit and the output side conductive circuit, so that they can be stably hooked on the respective conductive circuits.

[0027] The present invention may also be that the main body portion comprises: a pair of main body pieces, configured to extend in the circumferential direction of the wiring harness and be arranged side by side; and a pair of connecting portions, connecting one ends of the pair of main body pieces to each other and the other ends to each other, and the hook portion extends from the connecting portion to clamp the input side conductive circuit or the output side conductive circuit together with the pair of main body pieces.

[0028] According to this structure, regarding the retaining component, the hook portion clamps the input side conductive circuit or the output side conductive circuit together with a pair of main body pieces, so that it can be further firmly hooked on the input side conductive circuit or the output side conductive circuit, and can prevent it from being detached from the input side conductive circuit or the output side conductive circuit due to impact, etc.

[0029] <Example 1>

[0030] Below, refer to Figure 1 , Figure 2 A first embodiment of the noise filter device embodying the present invention will be described.

[0031] like Figure 1 As shown, the noise filter device 10 of the first embodiment is assembled to the wire harness WH. The noise filter device 10 functions in a manner of eliminating electrical noise generated in the wire harness WH. The wire harness WH is composed of a plurality of covered electric wires (conductive circuits) covered by an insulating member. In the wire harness WH, a plurality of covered electric wires are covered integrally by an insulating member. The wire harness WH includes a trunk line 21 and harness-side conductive circuits 22 and 23. The trunk line 21 is composed of a plurality of conductive circuits bundled together. The harness-side conductive circuits 22 and 23 are a pair of conductive circuits branched from the trunk line 21. The wire harness WH is provided with a harness-side connector 20. The harness-side connector 20 has a pair of terminal fittings (not shown) to which the harness-side conductive circuits 22 and 23 are respectively connected. The harness-side connector 20 accommodates a pair of terminal fittings in a state where the harness-side conductive circuits 22 and 23 are led out. The harness-side connector 20 is arranged adjacent to the trunk line 21 in a state where the harness-side conductive circuits 22 and 23 are bent.

[0032] like Figure 1As shown, the noise filter device 10 includes a filter-side connector 30 (equivalent to the "connector" of the present invention), an input-side conductive circuit 41, an output-side conductive circuit 42, a noise filter 50, and a pair of holding members 60. Figure 1 In the embodiment of the present invention, the noise filter device 10 is shown as including a pair of holding members 60 , but may include one or three or more holding members 60 .

[0033] like Figure 1 As shown, the filter side connector 30 includes an input side terminal 31, an output side terminal 32, and a housing 33. The input side terminal 31 is connected to one end of the input side conductive circuit 41. The output side terminal 32 is connected to one end of the output side conductive circuit 42. The input side conductive circuit 41 and the output side conductive circuit 42 are coated wires and have flexibility. The housing 33 is made of, for example, synthetic resin and is box-shaped. An insertion hole (not shown) through which the input side conductive circuit 41 and the output side conductive circuit 42 are inserted is formed in the housing 33. The housing 33 accommodates the input side terminal 31 in a state where the other end side of the input side conductive circuit 41 is led out. The housing 33 accommodates the output side terminal 32 in a state where the other end side of the output side conductive circuit 42 is led out.

[0034] like Figure 1 As shown, the filter side connector 30 is connected to the harness side connector 20. The input side terminal 31 and the output side terminal 32 are respectively connected to a pair of terminal fittings (not shown) of the harness side connector 20. As a result, the input side conductive circuit 41 and the output side conductive circuit 42 are respectively electrically connected to the harness side conductive circuits 22 and 23. The input side conductive circuit 41 and the output side conductive circuit 42 are adjacent to each other in a manner parallel to the trunk line 21 and separated by a predetermined interval.

[0035] like Figure 1 As shown, the noise filter 50 is connected to the other end of the input side conductive circuit 41 and the other end of the output side conductive circuit 42. The noise filter 50 includes a housing 51 and a capacitor 52. The housing 51 accommodates the capacitor 52. The housing 51 is made of, for example, synthetic resin. The capacitor 52 is, for example, a film capacitor. One electrode of the capacitor 52 is electrically connected to the other end of the input side conductive circuit 41. The other electrode of the capacitor 52 is electrically connected to the other end of the output side conductive circuit 42.

[0036] like Figure 1 As shown, the holding member 60 holds the input side conductive circuit 41 and the output side conductive circuit 42. Figure 1 , Figure 2As shown, the retaining member 60 is formed into a roughly circular arc shape by an elastically deformable material (such as rubber, resin, etc.). The retaining member 60 includes a main body 61 and a pair of hook portions 62. The main body 61 is formed into a circular arc shape (roughly C-shaped) by a long strip-shaped member. Therefore, the retaining member 60 becomes a simple form. The main body 61 is assembled to the wire harness WH in a manner surrounding the outer periphery of the wire harness WH. That is, the main body 61 is wound around the wire harness WH along the outer periphery of the wire harness WH. Therefore, the retaining member 60 is stably assembled to the wire harness WH.

[0037] like Figure 1 , Figure 2 As shown, a pair of hook portions 62 are formed at both ends of the main body 61 in the circumferential direction. The hook portion 62 is in the shape of an arc (roughly C-shaped) having a diameter smaller than the arc diameter of the main body 61. The hook portion 62 is formed to be wound on the inner side of the circumferential direction of the main body 61. The outer periphery of the main body 61 and the outer periphery of the hook portion 62 are smoothly connected. The pair of hook portions 62 are respectively wound on the input side conductive circuit 41 and the output side conductive circuit 42 from the radial outer side of the wire harness WH. Therefore, the pair of hook portions 62 can be stably hung on the input side conductive circuit 41 and the output side conductive circuit 42, respectively.

[0038] The curvature of the holding member 60 in the free state (non-elastically deformed state) is smaller than the curvature of the outer periphery of the wire harness WH. Therefore, the holding member 60, when attached to the outer periphery of the wire harness WH, exerts a function of moving in the direction of separation ( Figure 1 The elasticity of the input side conductive circuit 41 and the output side conductive circuit 42 is applied to the input side conductive circuit 41 and the output side conductive circuit 42. Therefore, the holding member 60 can stably maintain the direction of separation from each other ( Figure 1 The state in which the input side conductive circuit 41 and the output side conductive circuit 42 are subjected to force (in the direction of the arrow). Figure 1 As shown, the pair of hooking portions 62 are hooked on the input-side conductive circuit 41 and the output-side conductive circuit 42 respectively, thereby restricting the input-side conductive circuit 41 and the output-side conductive circuit 42 from approaching each other.

[0039] The input-side conductive circuit 41 and the output-side conductive circuit 42 led out from one surface of the filter-side connector 30 are both flexible, so there is a problem of being close to the wiring. When the input-side conductive circuit 41 and the output-side conductive circuit 42 are too close, signal leakage occurs between the two conductive circuits 41 and 42, and there is a problem of generating electrical interference such as crosstalk. However, in the noise filter device 10 of Example 1, as described above, the holding member 60 is hung on the input-side conductive circuit 41 and the output-side conductive circuit 42, respectively, thereby limiting the input-side conductive circuit 41 and the output-side conductive circuit 42 from being close. Therefore, compared with a structure in which the holding member 60 is not provided, the noise filter device 10 can increase the distance between the input-side conductive circuit 41 and the output-side conductive circuit 42, and can suppress electrical interference such as crosstalk between the two conductive circuits 41 and 42.

[0040] The noise filter device 10 is wound with, for example, tape when assembled to the wire harness WH. Specifically, the input-side conductive circuit 41, the output-side conductive circuit 42, and the wire harness WH are wound with tape. At this time, the input-side conductive circuit 41 and the output-side conductive circuit 42 are stably held on the wire harness WH by the holding member 60. Therefore, the input-side conductive circuit 41 and the output-side conductive circuit 42 are unlikely to deviate from their positions when they are wound with tape.

[0041] As described above, the wire harness WH is formed by bundling a plurality of covered wires (conductive circuits) covered by insulating members. Therefore, the noise filter device 10 can improve the noise elimination function by reducing the AC resistance through the skin effect of each covered wire. Therefore, the noise filter device 10 does not need to enlarge the capacitor 52 in order to improve the noise elimination function.

[0042] As described above, in the noise filter device 10 of the present embodiment 1, the holding member 60 that holds the input-side conductive circuit 41 and the output-side conductive circuit 42 has a main body 61 that surrounds the wire harness WH. Therefore, the holding member 60 can be stably assembled to the wire harness WH. In addition, the holding member 60 has a pair of hooking portions 62 formed at both ends of the main body 61, and hooked on the respective conductive circuits so that the input-side conductive circuit 41 and the output-side conductive circuit 42 are not close to each other. As a result, compared with a structure in which the holding member 60 is not provided, the noise filter device 10 can increase the distance between the input-side conductive circuit 41 and the output-side conductive circuit 42, and can suppress electrical interference such as crosstalk between the two conductive circuits 41 and 42.

[0043] In addition, the holding member 60 has elasticity that urges the input-side conductive path 41 and the output-side conductive path 42 in a direction in which they are separated from each other.

[0044] According to this structure, the input side conductive circuit 41 and the output side conductive circuit 42 are elastically pulled in the direction of separation from the other conductive circuit by the holding member 60. Therefore, the two conductive circuits 41 and 42 can maintain the state of being urged in the direction of separation from the other conductive circuit, and can be separated from the other conductive circuit more easily.

[0045] In addition, the main body 61 is composed of a long strip-shaped member, and the pair of hook portions 62 are respectively wound around the input-side conductive circuit 41 and the output-side conductive circuit 42 .

[0046] According to this structure, the main body 61 is formed by a long strip, so that the holding member 60 can be simplified. On this basis, the pair of hooks 62 are respectively wound around the input side conductive circuit 41 and the output side conductive circuit 42, so as to stably hook on the respective conductive circuits.

[0047] <Example 2>

[0048] Next, refer to Figure 3 , Figure 4 The second embodiment of the present invention will be described. The noise filter device 10 of the second embodiment is different from the first embodiment in the structure of the retaining member 260. The other structures are the same as the first embodiment, so the same reference numerals are attached to the same structures, and the description of the structure, function and effect is omitted. Figure 3 Although the configuration in which the noise filter device 10 includes one holding member 260 is illustrated, another number of holding members 260 may be provided.

[0049] like Figure 3 As shown, the holding member 260 holds the input side conductive circuit 41 and the output side conductive circuit 42. Figure 3 , Figure 4 As shown, the retaining member 260 is formed into a long ring shape by an elastically deformable material (such as rubber, resin, etc.). The retaining member 260 includes a main body 261 and a pair of hooking portions 262. The main body 261 includes a pair of main body pieces 261A and a pair of connecting portions 261B. The main body piece 261A is in the shape of a long strip. The main body piece 261A is assembled to the wire harness WH in a manner that surrounds the outer periphery of the wire harness WH. That is, the pair of main body pieces 261A are configured to extend in the circumferential direction of the wire harness WH and are arranged side by side. Therefore, the retaining member 260 is stably assembled to the wire harness WH.

[0050] like Figure 3 , Figure 4 As shown in FIG. 1 , a pair of connecting portions 261B connects one end of a pair of main body sheets 261A to each other and the other end to each other. Figure 4As shown, the central portion of the connection portion 261B is bent so as to bulge toward the other connection portion 261B side while the main body piece 261A extends straight. Both ends of the connection portion 261B are bent so as to bulge toward the side opposite to the other connection portion 261B side while the main body piece 261A extends straight.

[0051] like Figure 4 As shown, the hook portion 262 extends from the central portion of the connecting portion 261B to the other connecting portion 261B, and is configured to be sandwiched between a pair of main body pieces 261A. The width of the top end portion of the hook portion 262 is larger than the width of the base end portion. One hook portion 262 and a pair of main body pieces 261A clamp the input side conductive circuit 41 in the radial direction of the wire harness WH. Specifically, one hook portion 262 is assembled to the input side conductive circuit 41 from the output side conductive circuit 42 side in the circumferential direction of the wire harness WH, and contacts the input side conductive circuit 41 from the radial outside. A pair of main body pieces 261A contacts the input side conductive circuit 41 from the inside (output side conductive circuit 42 side). The other hook portion 262 and a pair of main body pieces 261A clamp the output side conductive circuit 42 in the radial direction of the wire harness WH. Specifically, the other hook portion 262 is attached to the output side conductive circuit 42 from the input side conductive circuit 41 side in the circumferential direction of the wire harness WH, and contacts the output side conductive circuit 42 from the radial outside. The pair of main body pieces 261A contacts the output side conductive circuit 42 from the inside (the input side conductive circuit 41 side).

[0052] The retaining members 260 are moved in a direction away from each other ( Figure 3 Therefore, the holding member 260 can stably maintain the direction in which the input side conductive circuit 41 and the output side conductive circuit 42 are separated from each other (the direction in which the input side conductive circuit 41 and the output side conductive circuit 42 are separated from each other). Figure 3 The state where force is applied (in the direction of the arrow). Figure 3 As shown, a pair of hooking parts 262 are hooked on the input side conductive circuit 41 and the output side conductive circuit 42, respectively, thereby restricting the input side conductive circuit 41 and the output side conductive circuit 42 from approaching each other. In particular, the holding member 260 has a structure in which the hooking parts 262 and the pair of main body pieces 261A sandwich the input side conductive circuit 41 and the output side conductive circuit 42. Therefore, compared with a structure in which one main body piece 261A contacts these conductive circuits, the holding member 260 can be hooked on these conductive circuits more firmly, and can prevent the holding member 260 from being separated from these conductive circuits due to impact or the like.

[0053] As described above, the noise filter device 10 of the second embodiment restricts the input side conductive circuit 41 and the output side conductive circuit 42 from approaching each other by hooking the holding member 260 on the input side conductive circuit 41 and the output side conductive circuit 42. Therefore, compared with a structure in which the holding member 260 is not provided, the noise filter device 10 can increase the distance between the input side conductive circuit 41 and the output side conductive circuit 42, and can suppress electrical interference such as crosstalk between the two conductive circuits 41 and 42.

[0054] As described above, in the noise filter device 10 of the second embodiment, the main body 261 has a main body sheet 261A and a pair of connecting portions 261B. The main body sheet 261A is arranged to extend in the circumferential direction of the wire harness WH and to be arranged side by side. The pair of connecting portions 261B connects one end of the pair of main body sheets 261A to each other and the other end to each other. The hook portion 262 extends from the connecting portion 261B and clamps the input side conductive circuit 41 or the output side conductive circuit 42 together with the pair of main body sheets 261A.

[0055] According to this structure, regarding the retaining member 260, the hook portion 262 clamps the input side conductive circuit 41 or the output side conductive circuit 42 together with a pair of main body pieces 261A, so that it can be further firmly hooked on the input side conductive circuit 41 or the output side conductive circuit 42, and can prevent it from detaching from the input side conductive circuit 41 or the output side conductive circuit 42 due to impact, etc.

[0056] <Other embodiments>

[0057] The present invention is not limited to the embodiments described in the above description and drawings, and for example, the following embodiments are also included in the technical scope of the present invention.

[0058] (1) In the above-mentioned first embodiment, the outer periphery of the hook portion 62 of the holding member 60 is smoothly connected to the outer periphery of the main body 61. However, the outer periphery of the hook portion 62 may be smoothly connected to the inner periphery of the main body 61. That is, the hook portion 62 may be wound around the two conductive paths 41 and 42 from the radial inner side of the wire harness WH.

[0059] (2) In the above-mentioned second embodiment, the hook portion 262 of the holding member 260 has a width at the top end greater than that at the base end, but it may be in another form. For example, the hook portion 262 may be in the form of a long strip plate, and the thickness at the top end may be greater than that at the base end. Thus, the top end of the hook portion 262 is easily hooked on the input-side conductive circuit 41 and the output-side conductive circuit 42.

[0060] (3) In the above-mentioned embodiments 1 and 2, although the noise filter 50 has a structure including the capacitor 52, it may also have other structures. For example, the noise filter 50 may also be a π-type filter composed of two capacitors and one coil. In addition, the noise filter 50 may also be an L-type filter composed of one capacitor and one coil. In addition, the noise filter 50 may also be a T-type filter composed of one capacitor and two coils.

[0061] (4) In the above-mentioned first and second embodiments, a film capacitor is used as the capacitor 52, but an electrolytic capacitor or a ceramic capacitor may also be used.

[0062] Description of Reference Numerals

[0063] 10…Noise filtering device

[0064] 22, 23…Conductive circuit on the harness side

[0065] 30…Filter side connector (connector)

[0066] 31…Input terminal

[0067] 32…Output terminal

[0068] 41…Input side conductive circuit

[0069] 42…Output side conductive circuit

[0070] 50…Noise filter

[0071] 60, 260…Retaining member

[0072] 61, 261…Main body

[0073] 62, 262…Hooking part

[0074] 261A…Main body

[0075] 261B…Connection

[0076] WH…Wire Harness

Claims

1. A noise filtering device, characterized in that: have: A connector that receives an input-side terminal connected to one end of an input-side conductive circuit having flexibility and an output-side terminal connected to one end of an output-side conductive circuit having flexibility, and is connected to a harness-side conductive circuit constituting a harness; a noise filter connected to the other end of the input-side conductive circuit and the other end of the output-side conductive circuit; and a holding member that holds the input-side conductive circuit and the output-side conductive circuit, The retaining member has: a main body portion mounted on the wire harness so as to surround an outer circumference of the wire harness; and A pair of hooking parts are formed at both ends of the main body in the circumferential direction, one of the hooking parts is hooked on the input side conductive circuit and the other hooking part is hooked on the output side conductive circuit, thereby limiting the input side conductive circuit from approaching the output side conductive circuit.

2. The noise filtering device according to claim 1, characterized in that: The holding member has elasticity for urging the input-side conductive circuit and the output-side conductive circuit in directions of being separated from each other.

3. The noise filtering device according to claim 1 or 2, characterized in that: The main body is composed of a long strip-shaped component. The pair of hook portions are respectively wound around the input-side conductive circuit and the output-side conductive circuit.

4. The noise filtering device according to claim 1 or 2, characterized in that: The main body has: a pair of main body sheets formed to extend in the circumferential direction of the wire harness and arranged side by side along the longitudinal direction of the wire harness; and A pair of connecting parts connects one end of the pair of main body sheets to each other and the other end to each other, The hook portion extends from the connecting portion, and sandwiches the input-side conductive circuit or the output-side conductive circuit together with the pair of main body sheets.

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