JP2015204528A - Noise elimination circuit of wire harness, and wire harness assembly including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noise elimination circuit of wire harness capable of eliminating noise accurately.SOLUTION: A noise elimination circuit 10 for eliminating noise of a wire harness WH1 routed in an automobile is constituted of a brach 4 branched from the trunk 6 of the wire harness WH1, and a noise filter 1 provided in the branch 4 and grounded. The branch 4 has a first circuit 11 connected electrically with the trunk 6 and extending from the proximal end to the distal end of the branch 4, a second circuit 12 connected electrically with the trunk 6 and extending from the proximal end to the distal end of the branch 4, and connected electrically with the first circuit 11 at the distal end of the branch 4, and a ground conductor 13 extending from the proximal end to the distal end of the branch 4, and arranged between the first circuit 11 and second circuit 12, where one end is grounded and the other end is open.

Description

  The present invention relates to a noise removal circuit for a wire harness mounted on an automobile or the like, and a wire harness assembly including the noise removal circuit.

  Conventionally, various noise removal circuits have been used to remove electrical noise on the wire harness. For example, in a car, a noise removal circuit of a wire harness shown in FIG. 7 is often used (see Patent Document 1).

  The noise removal circuit 510 of the wire harness WH shown in FIG. 7 branches the electric wires 61 and 62 to be subjected to noise removal from the trunk line 6 in which a plurality of electric wires 60, 61 and 62 are bundled, and the electric wire branch portions 61a and 62a. This is a circuit in which a unitized noise filter unit 501 is connected to the front end of the motor, and the noise filter unit 501 is grounded (body ground) by, for example, fixing the noise filter unit 501 to a vehicle body panel. The pair of electric wire branch portions 61a and 62a extend in parallel toward the noise filter portion 501, and a tape or the like is wound around the outer periphery. The noise filter unit 501 extracts noise (high-frequency noise) from the current input from the wire branch portion 61a, drops it to the ground, and outputs the current from which noise is extracted to the wire branch portion 62a.

JP 2009-111182 A

  In the conventional noise elimination circuit 510 described above, as indicated by an arrow N in FIG. 7, noise propagates from the wire branch portion 61a to the wire branch portion 62a without passing through the noise filter portion 501 due to the line capacitance. There was a problem that there was. Further, when the distance from the main line 6 of the wire harness WH to the noise filter unit 501 is long, the above-described noise propagation is particularly likely to occur.

  Therefore, the present invention provides a noise removal circuit for a wire harness that can accurately remove noise in a noise removal circuit in which a noise filter unit is provided at a branch portion branched from a trunk line of the wire harness, and a wire including the same An object is to provide a harness assembly.

  The invention described in claim 1 is a noise removal circuit for a wire harness, comprising: a branch portion branched from a main line of the wire harness; and a noise filter portion provided in the branch portion and grounded, wherein the branch A first circuit portion that is electrically connected to the trunk line and extends from a proximal end portion of the branch portion to a distal end portion; and a base end portion of the branch portion that is electrically connected to the trunk line and A second circuit portion that extends from the distal end portion of the branch portion and is electrically connected to the first circuit portion at the distal end portion of the branch portion; A noise removal circuit for a wire harness, comprising: a grounding conductor disposed between a circuit part and the second circuit part, wherein one end is grounded and the other end is open. is there.

  The invention described in claim 2 is the invention described in claim 1, wherein the first circuit portion has a first inductance forming portion, and the second circuit portion is a second inductance forming portion. It is characterized by having.

  The invention described in claim 3 is the invention described in claim 1 or claim 2, wherein the branch portion is a branch line branched from the main line, a filter constituting portion constituting the noise filter portion, The noise filter unit is unitized by housing the filter component in a housing, and the branch line and the noise filter unit are connected by a connector. It is.

  The invention described in claim 4 is the invention described in any one of claims 1 to 3, wherein a metal plate which is grounded or forms a ground is disposed along the branch portion. It is characterized by this.

  The invention described in claim 5 includes the noise removal circuit of the wire harness according to any one of claims 1 to 4 and a wire harness from which noise is removed by the noise removal circuit. A wire harness assembly.

  According to the first, third, and fifth aspects of the present invention, the branch portion extends from the base end portion to the tip end portion of the branch portion and is between the first circuit portion and the second circuit portion. And having a grounding conductor having one end grounded and the other end open, the first circuit portion and the second circuit portion are close to each other, and the noise filter portion from the trunk of the wire harness Even when the distance to the second circuit portion is far, it is possible to make it difficult for noise propagation due to the line capacitance between the first circuit portion and the second circuit portion to occur. Therefore, noise can be removed with high accuracy.

  According to the second aspect of the present invention, it is possible to make it difficult for noise propagation to occur due to the ground conductor even between a pair of inductance forming portions where noise propagation is likely to occur due to electrostatic coupling.

  According to the invention described in claim 4, since the metal plate that is grounded or forms the ground is disposed along the branch portion, between the first circuit portion and the second circuit portion. Noise propagation can be made even more difficult to occur.

It is a circuit diagram of the noise removal circuit of the wire harness concerning the 1st Embodiment of the present invention. It is explanatory drawing explaining the structure of the wire harness of FIG. It is a perspective view of the noise filter part which comprises the noise removal circuit of FIG. It is explanatory drawing explaining the structure of the noise filter part of FIG. It is a circuit diagram of the noise removal circuit of the wire harness concerning the 2nd Embodiment of this invention. It is explanatory drawing explaining the structure of the noise removal circuit of FIG. It is a circuit diagram of the noise removal circuit of the conventional wire harness.

(First embodiment)
A “wire harness noise removal circuit” and a “wire harness assembly” according to a first embodiment of the present invention will be described with reference to FIGS. The “wire harness noise removal circuit 10” shown in FIG. 1 is a circuit that removes noise from the wire harness WH1 that is routed in an automobile and connects devices mounted on the automobile, and the trunk 6 of the wire harness WH1. The "branch part 4" branched from the "branch part 4" and the "noise filter part 1" provided in the branch part 4 and grounded. The “wire harness assembly” includes the noise removal circuit 10 and the wire harness WH1 from which noise is removed by the noise removal circuit 10.

  As shown in FIG. 1, the branch portion 4 is electrically connected to a trunk line 6 in which a plurality of electric wires 60, 61, 62 are bundled, and extends from the base end portion of the branch portion 4 to the distal end portion. The first circuit unit 11 and the main line 6 are electrically connected and extend from the proximal end portion to the distal end portion of the branch portion 4, and are electrically connected to the first circuit portion 11 at the distal end portion of the branch portion 4. The second circuit portion 12 is extended from the proximal end portion to the distal end portion of the branching portion 4, and is disposed between the first circuit portion 11 and the second circuit portion 12, and one end is grounded. And a ground conductor 13 whose other end is open.

  Thus, in the noise removal circuit 10, the branching portion 4 extends from the base end portion to the tip end portion of the branching portion 4, and is disposed between the first circuit portion 11 and the second circuit portion 12, Since the ground conductor 13 having one end grounded and the other end open is provided, the first circuit portion 11 and the second circuit portion 12 are close to each other, and the noise filter is connected from the trunk line 6 of the wire harness WH1. Even when the distance to the part 1 is far, noise propagation due to the line capacitance between the first circuit part 11 and the second circuit part 12 can be made difficult to occur. Therefore, noise can be removed with high accuracy.

  Further, the branching unit 4 is divided into a separate body of a branching line 6 a branched from the main line 6 and a filter constituting unit 2 constituting the noise filter unit 1. The noise filter unit 1 is unitized with a filter component 2 housed in a housing 5. The branch line 6a and the noise filter unit 1 are connected by a connector.

  As shown in FIG. 2, the branch line 6 a includes a pair of wire branch portions 61 a and 62 a in which the wires 61 and 62 to be noise-removed out of the wires 60, 61 and 62 of the trunk line 6 branch from the trunk line 6 and extend in parallel. A grounding wire 63 disposed between the wire branch portions 61a and 62a and opened on the side away from the noise filter portion 1 (the trunk line 6 side), and a female attached to the tips of the wire branch portions 61a and 62a. And a female terminal 73 attached to the tip of the ground wire 63, and a connector housing 70 that houses these terminals 71, 72, 73. The terminals 71, 72, 73 and the connector housing 70 constitute a connector 7. The electric wire branch portion 61a (that is, the electric wire 61), the electric wire branch portion 62a (that is, the electric wire 62), and the grounding wire 63 are each a covered electric wire in which the core wire is covered with an insulating coating.

  The ground wire 63 extends in parallel between the pair of wire branch portions 61a and 62a. Further, the end of the ground wire 63 on the side away from the noise filter portion 1 is positioned in the vicinity of the center of the trunk line 6 in the radial direction, and is not electrically connected to anything. A tape 64 is wound around the outer periphery of the wire branch portions 61a and 62a and the ground wire 63, and the positional relationship between these wires (the ground wire 63 is located at the center) is fixed.

  In addition, the positional relationship between the pair of wire branch portions 61a and 62a and the ground wire 63 is fixed by winding the tape 64 around the outer periphery, but in addition to this, the pair of wire branch portions 61a and 62a and the ground wire 63 May be bonded so that the positional relationship is fixed.

  By arranging the ground wire 63 between the pair of wire branch portions 61a and 62a in this way, even when the wire branch portions 61a and 62a come close to each other and the branch wire 6a extends long, the wire branch portion 61a and the wire Noise propagation due to the line-to-line capacitance with the branch portion 62a is less likely to occur. That is, when noise is transmitted from the wire branch portion 61a to the wire branch portion 62a without passing through the noise filter portion 1, the noise is transmitted to the ground wire 63 closer to the wire branch portion 62a and falls to the ground. Noise propagation is unlikely to occur between 61a and the wire branch portion 62a.

  In the branch line 6a described above, the electric wire branch portion 61a and the terminal 71 constitute a part of the “first circuit portion 11”. Further, the wire branch portion 62 a and the terminal 72 constitute a part of the “second circuit portion 12”. Further, the electric wire branch portion 62a and the terminal 73 constitute a part of the “ground conductor 13”.

  Then, the structure of the said filter structure part 2 and the noise filter part 1 which has it is demonstrated. As shown in FIGS. 3 to 4, the noise filter unit 1 includes a male input terminal 24 connected to the wire branch portion 61 a, a male output terminal 25 connected to the wire branch portion 62 a, and an input terminal 24. A pair of inductors L1 and L2 provided in a conductive path from the output terminal 25 to the output terminal 25; a first bus bar 21, a second bus bar 22, and a third bus bar 23 that form a conductive path from the input terminal 24 to the output terminal 25; A ground bus bar 26 connected to the ground wire 63, a capacitor C, a bracket 27, a mounting member 3, and a housing 5 are provided.

  The input terminal 24, the output terminal 25, the first bus bar 21, the second bus bar 22, the third bus bar 23, the ground bus bar 26, and the bracket 27 described above are mounted with a base material punched from a single metal plate made of synthetic resin. It is integrated with the member 3 by insert molding, and after the insert molding, unnecessary portions of the base material are cut to form the shape shown in FIG.

  The input terminal 24 and the output terminal 25 are formed in an elongated plate shape, and are arranged in parallel with a space therebetween.

  The first bus bar 21 and the second bus bar 22 are formed in a substantially rectangular shape in plan view, and are arranged at intervals so that their short sides are parallel to each other. That is, the first bus bar 21 and the second bus bar 22 are arranged so that the long sides thereof are aligned on a straight line. The input terminal 24 is integrally formed with the first bus bar 21 so as to be continuous with the short side of the first bus bar 21. The output terminal 25 is integrally formed with the second bus bar 22 so as to be continuous with the short side of the second bus bar 22. The third bus bar 23 is formed in an elongated rectangular shape, and is spaced from the first bus bar 21 and the second bus bar 22 so that the long sides thereof are parallel to the long sides of the first bus bar 21 and the second bus bar 22. It is arranged with a gap.

  The bracket 27 is disposed on the opposite side of the third bus bar 23 from the first bus bar 21 and second bus bar 22 side. A bolt insertion hole 27 a is provided at one end of the bracket 27. The bracket 27 is grounded (body ground) by passing the bolt through the bolt insertion hole 27a and fixing the bracket 27 to the vehicle body panel.

  The ground bus bar 26 is integrally formed with the bracket 27 and extends from the bracket 27 to the input terminal 24 and the output terminal 25 side, bypassing the third bus bar 23. The ground bus bar 26 includes a portion 26b connected to the bracket 27, a portion 26a disposed between the first bus bar 21 and the second bus bar 22, and a male terminal 26c extending from the portion 26a. doing. The portion 26 a is disposed between the short side of the first bus bar 21 and the short side of the second bus bar 22 and is disposed on the same plane as the first bus bar 21 and the second bus bar 22. The terminal 26c is disposed between the position where the input terminal 24 is disposed and the position where the output terminal 25 is disposed.

  In addition, the input terminal 24, the output terminal 25, and the terminal 26 c are positioned in a fitting portion 52 described later of the housing 5 and constitute a connector 50 together with the fitting portion 52. This connector 50 is connected to the connector 7 of the branch line 6a. When the connector 50 and the connector 7 are connected, the input terminal 24 is fitted to the terminal 71 attached to the distal end portion of the wire branch portion 61a, and the output terminal 25 is attached to the distal end portion of the wire branch portion 62a. 72 and the terminal 26 c is fitted with a terminal 73 attached to the tip of the ground wire 63.

  In this embodiment, the pair of inductors L1 and L2 uses a toroidal coil in which a winding is wound around a toroidal core. The inductor L1 has one lead wire inserted into the through hole 21a or the through hole 21b of the first bus bar 21 and soldered, and the other lead wire inserted into the through hole 23a or the through hole 23b of the third bus bar 23. Soldered. The inductor L2 has one lead wire inserted into the through hole 22a or the through hole 22b of the second bus bar 22 and soldered, and the other lead wire inserted into the through hole 23c or the through hole 23d of the third bus bar 23. Soldered. Further, as shown in FIG. 4, the portion 26a of the ground bus bar 26 is disposed between a position where the inductor L1 is disposed and a position where the inductor L2 is disposed.

  The capacitor C has one lead wire inserted into the through hole 23e of the third bus bar 23 and soldered, and the other lead wire inserted into the through hole 27b of the bracket 27 and soldered.

  The housing 5 is made of synthetic resin, and includes a cylindrical fitting portion 52 that positions the input terminal 24, the output terminal 25, and the terminal 26c, and a main body portion 51 that accommodates other components. . The bracket 27 has a bolt insertion hole 27 a positioned outside the housing 5. Thus, the noise filter unit 1 includes the input terminal 24, the output terminal 25, the first bus bar 21, the second bus bar 22, the third bus bar 23, the ground bus bar 26, the bracket 27, the mounting member 3, the pair of inductors L1 and L2. The capacitor C is accommodated in the housing 5 and unitized.

  The noise filter unit 1 having the above configuration removes noise (high-frequency noise) from the current input from the wire branch portion 61a, and outputs the current from which the noise has been removed to the wire branch portion 62a. Further, the noise on the ground wire 63 is dropped to the ground.

  In general, the vicinity of an inductance forming portion such as a coil is a portion where noise propagation is particularly likely to occur due to electrostatic coupling. In this noise filter portion 1, a position between inductors L1 and L2 where electrostatic coupling is likely to occur. Since the portion 26 a of the ground bus bar 26 is disposed between the first bus bar 21 and the second bus bar 22, noise propagation occurs due to electrostatic coupling between the first bus bar 21 and the second bus bar 22. hard. That is, when noise is transmitted from the first bus bar 21 to the second bus bar 22 without passing through a predetermined circuit, the noise is transmitted to the ground bus bar 26 closer to the second bus bar 22 and falls to the ground. Propagation due to electrostatic coupling between the first bus bar 22 and the second bus bar 22 hardly occurs. Therefore, the interval between the first bus bar 21 and the second bus bar 22 can be reduced between the inductors L1 and L2 where electrostatic coupling is likely to occur, and the noise filter unit 1 can be downsized while satisfying the noise removal performance. it can.

  In the noise filter unit 1 described above, the input terminal 24, the first bus bar 21, the inductor L 1 (corresponding to the “first inductance forming unit” in the claims), and the third bus bar 23 are the above “first”. 1 part of the circuit portion 11 ”. The output terminal 25, the second bus bar 22, the inductor L <b> 2 (corresponding to the “second inductance forming unit” in the claims), and the third bus bar 23 are the “second circuit unit 12”. Part of. Further, the ground bus bar 26 and the bracket 27 constitute part of the “ground conductor 13”.

  Further, the input terminal 24, the first bus bar 21, the inductor L 1, the third bus bar 23, the inductor L 2, the second bus bar 22, the output terminal 25, the ground bus bar 26, and the bracket 27 correspond to the filter configuration unit 2.

(Second Embodiment)
A “wire harness noise removal circuit” and a “wire harness assembly” according to a second embodiment of the present invention will be described with reference to FIGS. 5 to 6, the same components as those of the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  The “wire harness noise removal circuit 110” shown in FIGS. 5 and 6 is a circuit that removes noise from the wire harness WH2, and “branch line 6b” as a “branch portion” branched from the trunk line 6 of the wire harness WH2. The "noise filter unit 101" provided on the branch line 6b and grounded, and the "vehicle body panel 9" forming the ground. The “wire harness assembly” includes the noise removal circuit 110 and the wire harness WH2 from which noise is removed by the noise removal circuit 110.

  As shown in FIG. 5, the branch line 6b is electrically connected to the trunk line 6 in which a plurality of electric wires 60, 61, 62 are bundled, and extends from the base end portion to the tip end portion of the branch line 6b. The first circuit portion 111 is electrically connected to the trunk line 6 and extends from the proximal end portion of the branch line 6b to the distal end portion, and is electrically connected to the first circuit portion 111 at the distal end portion of the branch line 6b. The second circuit portion 112 is extended from the proximal end portion to the distal end portion of the branch line 6b and is disposed between the first circuit portion 111 and the second circuit portion 112, and one end is grounded. And a ground wire 63 as a “ground conductor” whose other end is open.

  The first circuit unit 111 includes an electric wire branch part 61a where the electric wire 61 of the main line 6 is branched from the main line 6, and a first inductance forming part L11 provided on the electric wire branch part 61a. The first inductance forming portion L11 is formed by attaching a ferrite bead to the outer periphery of the wire branch portion 61a.

  The second circuit unit 112 includes an electric wire branch part 62a in which the electric wire 62 of the main line 6 is branched from the main line 6 and extends in parallel with the electric wire branch part 61a, and a second inductance forming part provided on the electric wire branch part 62a. L12. The second inductance forming portion L12 is formed by attaching ferrite beads to the outer periphery of the wire branch portion 62a.

  The first inductance forming portion L11 and the second inductance forming portion L12 are formed by attaching ferrite beads to the outer periphery of the wire branch portions 61a and 62a. In addition to this, the wire branch portion 61a is attached to the core. 62a may be formed by being spirally wound, or only the wire branch portions 61a and 62a may be spirally wound without using a core.

  The ground wire 63 extends in parallel between the pair of wire branch portions 61a and 62a. Further, the end of the ground wire 63 on the main line 6 side is positioned in the vicinity of the center of the main line 6 in the radial direction, and is not electrically connected to anything. In other words, it is open. Tapes are wound around the outer circumferences of the wire branch portions 61a and 62a and the ground wire 63, and the positional relationship between these wires (the ground wire 63 is located in the center) is fixed.

  The noise filter unit 101 includes a capacitor C electrically connected between the first inductance forming unit L11, the second inductance forming unit L12, and the tip of the branch line 6b and the ground (that is, the vehicle body panel 9). And is composed of. Thus, the noise filter unit 101 is not unitized.

  The noise filter unit 101 having the above configuration removes noise (high-frequency noise) from the current flowing through the electric wire 61 and allows the electric current from which the noise has been removed to flow through the electric wire 62.

  The vehicle body panel 9 is made of a metal plate, and is disposed in the vicinity of the branch line 6b and along the branch line 6b as shown in FIG. That is, the branch line 6 b is routed near the vehicle body panel 9 and along the vehicle body panel 9. By setting it as such an arrangement | positioning, the noise propagation by the line capacity | capacitance between the electric wire branch part 61a and the electric wire branch part 62a can be made still more difficult to occur.

  In the first embodiment and the second embodiment described above, the “first circuit body”, the “second circuit body”, and the “ground conductor” constituting the “branch portion” are independent covered wires. The wire branch portion 61a, the wire branch portion 62a, and the ground wire 63 are used. However, in the present invention, the branch portion may be configured using a flexible flat cable, a flexible printed board, or the like.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

1,101 Noise filter part 4 Branch part 6 Trunk line 6b Branch line (branch part)
DESCRIPTION OF SYMBOLS 10,110 Noise removal circuit of wire harness 11,111 1st circuit part 12,112 2nd circuit part 13 Grounding conductor 63 Grounding electric wire (grounding conductor)
WH1, WH2 wire harness

Claims (5)

In the noise removal circuit of the wire harness,
A branch portion branched from the main line of the wire harness;
A noise filter provided at the branch and grounded;
With
The branch is
A first circuit portion that is electrically connected to the trunk line and extends from a base end portion to a tip end portion of the branch portion;
A second circuit portion that is electrically connected to the trunk line and extends from a proximal end portion of the branch portion to a distal end portion, and is electrically connected to the first circuit portion at a distal end portion of the branch portion;
A grounding conductor extending from the base end portion of the branching portion to the tip end portion and disposed between the first circuit portion and the second circuit portion, one end of which is grounded and the other end thereof is opened;
A noise removal circuit for a wire harness characterized by comprising: The wire harness noise according to claim 1, wherein the first circuit unit includes a first inductance forming unit, and the second circuit unit includes a second inductance forming unit. Removal circuit. The branch section is divided into a separate branch line branched from the main line and a filter configuration section constituting the noise filter section,
The noise filter unit is unitized by housing the filter component in a housing,
The noise removal circuit for a wire harness according to claim 1 or 2, wherein the branch line and the noise filter unit are connected by a connector. The noise removal circuit for a wire harness according to any one of claims 1 to 3, wherein a metal plate that is grounded or forms a ground is disposed along the branch portion. A wire harness assembly comprising: the noise removal circuit of the wire harness according to any one of claims 1 to 4; and a wire harness from which noise is removed by the noise removal circuit. .

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