JP5697861B2 - Harness noise filter structure - Google Patents

Description

  The present invention relates to a noise filter structure of a harness using a magnetic material such as a ferrite core as a noise countermeasure for, for example, an electric part of an automobile.

  Various electric parts are mounted on automobiles, and various forms of noise filters are mounted using capacitors and coils for EMC countermeasures.

  For example, in Patent Document 1, a split ferrite core is provided with a wire insertion groove, the ferrite core is accommodated in a synthetic resin case, the connector lead-out wire is inserted into the ferrite core groove, and the case is A so-called retrofitted noise filter (not shown) is described which is configured to be closed.

  In Patent Document 2, an insulation-coated copper wire is wound around a cylindrical ferrite core in a coil shape, and both ends of the insulation-coated copper wire are connected to a harness (electric wire) with a crimp terminal, and the insulation-coated copper wire is crimped. A so-called sub-harness built-in type noise filter (not shown) configured by housing a terminal in a synthetic resin case is described.

  In Patent Document 3, a winding coil is wired around a cylindrical magnetic core and fixed with an adhesive, one end of the winding coil is connected to one metal terminal, A so-called terminal built-in type noise filter (not shown) configured by connecting an end to the other terminal and fixing each terminal to a resin base is described.

  The ferrite in each of the above examples is a ferromagnetic material of metal oxide (electrically insulating), which is sintered as ceramic, for example, and has a higher specific resistance than metal, so it is suitable for use at high frequencies. ing. The core means core, iron core and the like. In accordance with the magnetization of the ferrite core, the impedance (Ω) of the wire through which the noise current flows increases, and the propagation of the noise current is suppressed. When a high-frequency current that becomes noise flows through the electric wire, a magnetic field is generated, which is absorbed by the ferrite core, converted into heat, and radiated. Examples of the magnetic material include permalloy and iron core in addition to ferrite.

JP 2007-5751 A (FIGS. 1 and 3) JP-A-8-330759 (FIG. 1) JP 2008-109484 A (FIGS. 2 to 3)

  However, in the noise filter described in the above cited reference 1, since the noise filter is only fixed to the harness (electric wire), the weight is directly applied to the electric wire due to the weight of the ferrite core, and the electric wire is affected by the vibration of the vehicle or the like. There was a concern that would damage or cause noise.

  Moreover, in the noise filter described in the cited document 2, it is necessary to connect a copper wire coil and a harness (electric wire), fix a ferrite core and a coil, fix a case and a harness, and the like. There was a problem that the number of parts increased and the structure became complicated.

  Further, the noise filter described in the cited document 3 has a problem that the structure for connecting and fixing each terminal and the winding coil becomes complicated.

  In view of the above-mentioned points, the present invention not only reliably suppresses noise, but also reduces the number of parts, downsizing, reducing weight and cost, reducing parts assembly work, and mounting (mounting) side. An object of the present invention is to provide a noise filter structure for a harness that can save space.

To achieve the above object, a noise filter structure of the harness according to claim 1 of the present invention, the magnetic body is held inside the cylindrical portion of the insulating clamping member, the wire on the outer peripheral side of the cylindrical portion A spiral groove for winding is provided, and the inlet of the groove on the outer periphery of the cylindrical part is formed narrower than the inside of the groove, and the wire winding of the wire harness is pushed into the groove from the inlet The winding is prevented from detachment from the groove at the inlet narrower than the outer diameter of the electric wire, and the electric wire following the start and end of the winding is provided for each of the clamp members. It is fixed to the electric wire fixing part.

With the above configuration, the wires of the wire harness are spirally wound on the outer side in the radial direction of the magnetic body, and compared with the case where the conventional copper wire is spirally wound and connected to the harness, No connection man-hours are required. Moreover, since each electric wire part following the starting end and termination | terminus of a winding part is being fixed to each electric wire fixing | fixed part of a clamp member, the dispersion | variation and detachment | leave of a winding part are prevented and noise absorption is performed reliably.
Further, the magnetic body is inserted into the hole portion from one opening (inlet) of the hole portion of the cylindrical portion and held without rattling. The magnetic body may be fixed in the hole by press fitting or the like, or may be movable along the hole (requires a stopper).
In addition, by not providing a winding portion on the outer periphery of the magnetic body, the magnetic body is inserted and arranged without gaps inside the cylindrical portion and is accurately positioned.
Further, the electric wire is accurately wound at a correct pitch along the groove portion, and noise absorption is reliably performed. Moreover, an external appearance structure is compactized because the winding part of an electric wire is embed | buried in a groove part.

According to the invention of claim 1, by forming a part of the noise filter with the electric wire of the wire harness, the coil winding part is formed with a conventional copper wire, and compared with the case where the winding part is connected to the harness, Connection terminals and connection man-hours are no longer required, reducing the number of parts, reducing the weight of the structure, reducing costs, reducing parts assembly work, and saving space on the mounting side. Moreover, by fixing the electric wire following the winding part to the electric wire fixing part of the clamp member, the winding part is prevented from being separated or detached, noise is reliably suppressed, and the reliability of noise absorption is improved.
Moreover, a magnetic body can be easily hold | maintained by inserting a magnetic body in the hole part of a cylindrical part. In addition, since the cylindrical portion does not require an opening / closing hinge, locking means, or the like as compared with the conventional case, the structure can be simplified, compact, and space-saving.
Moreover, noise absorbability can be improved by winding an electric wire correctly with a correct pitch along a groove part. Moreover, a structure can be compactized to radial direction by burying the winding part of an electric wire in a groove part.

It is a perspective view showing one embodiment of the noise filter structure of the harness concerning the present invention. (A) and (b) are perspective views which show the modification of embodiment of FIG. 1 in order of winding of an electric wire. The other embodiment of the noise filter structure of the harness which concerns on this invention is shown, (a) is a disassembled perspective view, (b) is a perspective view of an assembly state. (A) is a perspective view which shows an example of the electric wire fixing | fixed part in each embodiment, (b) is a front view which shows another example. (A) is a perspective view which shows an example of the cylindrical part which has an electric wire winding groove, (b) is AA equivalent sectional drawing of (a) which shows an example of an electric wire winding groove. (A) is a perspective view which shows an example of the cylindrical part of a clamp member, (b) is a perspective view which shows the modification of the latching | locking part of a clamp member. It is a disassembled perspective view which shows the 1st modification of a clamp member. It is a perspective view which shows the 2nd modification of a clamp member. The 3rd modification of a clamp member is shown, (a) is an exploded perspective view and (b) is a front view. FIG. 8A is a perspective view in an open state, and FIG. 5B is a perspective view in a closed state, showing a fourth modification of the clamp member. It is a perspective view which shows the 5th modification of a clamp member.

  FIG. 1 shows an embodiment of a noise filter structure of a harness according to the present invention.

  This structure includes a cylindrical ferrite core (magnetic body) 1, a cylindrical portion 2 for inserting and holding the ferrite core 1, and a spiral groove portion 3 for winding an electric wire formed on the outer periphery of the cylindrical portion 2. A synthetic (insulating) resin made of a wire fixing portion 4 integrally provided at the longitudinal front and rear ends of the cylindrical portion 2 and a locking portion 5 integrally provided at the longitudinal center of the cylindrical portion 2 And an insulation-coated electric wire (hereinafter referred to as an electric wire) 7 that is spirally routed along the groove portion 3 of the cylindrical portion 2 and fixed to the electric wire fixing portions 4 before and after the groove portion 3. It has been done.

  The cylindrical portion 2 has a hole 8 having a circular cross section for inserting the ferrite core 1 concentrically with the outer peripheral surface having a circular cross section. The groove portions 3 on the outer periphery of the cylindrical portion 2 are formed at equal intervals at a narrow pitch in the first half and the second half excluding the central portion 2a, and are formed at a wide pitch while avoiding the locking portions 5 in the central portion 2a. The wire winding groove 3 of this example is formed in a substantially semicircular cross section with a diameter slightly larger than the outer diameter of the wire 7.

In addition, it is also possible to form the groove part 3 deeper than a semicircle and completely accommodate the electric wire 7 in the groove part 3 (without protruding the electric wire 7 to the outside). It is also possible to form the groove portion 3 with the same diameter as the outer diameter of the electric wire 7 or a slightly smaller diameter and push the electric wire 7 into the groove portion 3 to be fixed. It is also possible to fix the electric wire 7 partially by forming the groove 3 with the same diameter as the outer diameter of the electric wire 7 or slightly smaller than the outer diameter of the electric wire 7 at two places, the starting end and the terminal end of the groove 3. A spiral winding portion (coil winding portion) of the electric wire 7 is denoted by reference numeral 7a.

  The wire fixing portion 4 at the front and rear ends is composed of a horizontal plate portion 9 following the front and rear ends of the tubular portion 2 and a wire holding piece 10 erected on the upper surface of the plate portion 9. The holding piece 10 is at the center. It has a slit 11 for wire press-fitting.

  The central locking portion 5 is an existing locking clip, and includes a downward-facing dish-shaped spring lip 12 and a pair of flexible claws 13 hanging from the center of the spring lip 12. The claw portion 13 is inserted into the hole 15 of the panel 14 of the vehicle, and the spring lip 12 is brought into elastic contact with the upper surface of the panel 14 so that the engagement of the claw portion 13 with the hole 15 can be performed without up and down play.

  The ferrite core 1 is fixed in the hole 8 of the cylindrical portion 2 by, for example, press fitting or an adhesive. The ferrite core 1 is inserted into the hole 8 so as to be movable in the front-rear direction, the holding pieces 10 of the respective wire fixing portions 4 are arranged close to the front and rear ends of the ferrite core 1, and the ferrite core 1 is moved by the holding pieces 10. It is also possible to form a stopper to block.

  It is preferable that the sandwiching piece 10 or the plate portion 9 made of synthetic resin has flexibility in the plate thickness direction and bends when the ferrite core 1 is inserted into the tubular portion 2 to allow the insertion of the ferrite core 1. . The wire fixing portion 4 may be formed separately from the cylindrical portion 2, and after inserting the ferrite core 1 into the cylindrical portion 2, the wire fixing portion 4 may be locked to the cylindrical portion 2 by the locking means. It is possible.

  After inserting the ferrite core 1 into the cylindrical portion 2, the electric wire 7 is spirally wound around the outer periphery of the cylindrical portion along the groove portion 3. Or after winding the electric wire 7 around the outer periphery of the cylindrical part 2 along the groove part 3, the ferrite core 1 is inserted into the cylindrical part 2, and the electric wire 7 is fixed to the electric wire fixing part 4. Or after winding the electric wire 7 around the outer periphery of the cylindrical part 2 along the groove part 3 and fixing it to the electric wire fixing part 4, the plate part 9 is bent downward and the ferrite core 1 is inserted into the cylindrical part 2.

  In any case, the electric wire 7 is easily and reliably wound around the tubular portion 2 with the correct pitch and the number of turns along the groove portion 3. Anyone can easily and reliably wind the electric wire 7 along the groove portion 3 in the wire harness manufacturing process. As the number of turns of the electric wire 7 increases, the attenuation effect increases and noise is removed.

  Since the electric wire 7 is a part (harness) of the wire harness, it is unnecessary to connect the coil winding portion to the wire harness (electric wire) with a terminal or a connection terminal as in the prior art (Patent Document 2). The electric wire 7 is fixed by being inserted into the slit 11 of the holding piece 10 of the electric wire fixing portion 4 with a finger or the like (press-fit locking) from above. This will be described later. For example, one end of the electric wire 7 is connected to a load side (not shown) such as an electrical component or an electrical component, and the other end of the electric wire 7 is connected to a power supply side or a signal supply side.

  A simple and compact noise filter structure is constituted by the three parts of the ferrite core 1, the clamp member 6, and the electric wire 7 of the wire harness. Since conventional cases (Patent Documents 1 and 2) and a shrink tube instead of the case are unnecessary, the structure is simplified and compact, and the mounting site of the noise filter 16 on the vehicle side is saved. . In the specification, the vertical and horizontal directions are for convenience of explanation, and do not always coincide with the mounting direction of the clamp member 6.

  2 (a) and 2 (b) show an embodiment in which the locking portion 5 is integrally provided at one end rather than the center of the cylindrical portion 2 'of the clamp member 6'. Since the other configuration is the same as that of the embodiment of FIG. 1, the same components are denoted by the same reference numerals and detailed description thereof is omitted.

  As shown in FIG. 2 (a), wire fixing portions 4 'and 4 are integrally provided at both front and rear ends of the cylindrical portion 2', and on the lower surface (back surface) of the horizontal plate portion 9 'of one of the wire fixing portions 4'. A spring lip 12 that is the locking portion 5 and a claw portion 13 at the center thereof are integrally provided. One plate portion 9 ′ is formed wider than the other plate portion 9 in accordance with the locking portion 5. The claw portion 13 can be smoothly inserted into the hole 15 of the panel 14 (FIG. 1) by pressing the plate portion 9 'downward. Since there is no locking part 5 in the center, the groove part 3 on the outer periphery of the cylindrical part 2 'is formed at an equal pitch over the entire length.

  FIG. 2A shows a state where the electric wire 8 is being wound around the outer periphery of the cylindrical portion 2 ′ along the groove portion 3, and the electric wire 7 is fixed to the electric wire fixing portion 4 on the winding start end side. Thus, it is wound around the groove portion 3 with good workability without slipping. The same applies to the embodiment of FIG. The ferrite core 1 is previously inserted into the cylindrical portion 2 '. As shown in FIG. 2 (b), after the electric wire 7 is spirally wound, it is fixed to the electric wire fixing portion 4 'on the winding end side. The winding part of the electric wire 7 is shown with the code | symbol 7a.

  3A and 3B show another embodiment of the noise filter structure of the harness according to the present invention.

As shown in FIG. 3A, this structure includes a cylindrical ferrite core (magnetic body) 1, an insulating covered electric wire 7 that is a part of a wire harness that is spirally wound around the outer peripheral surface of the ferrite core 1, and an electric wire. A substantially semi-cylindrical cover 19 that accommodates and holds the ferrite core 1 around which the wire 7 is wound, a substrate part 21 that is connected to the cover 19 by a thin hinge 20, and an upper surface (front surface) of the front and rear ends of the substrate part 21. The clamp member 22 includes a holding piece 10 as an electric wire fixing portion provided and a locking portion 5 provided on the lower surface (back surface) at the center of the substrate portion 21 . The same components as those in the embodiment of FIG.

  In the embodiment of FIG. 1, the electric wire 7 is wound around the clamp member 6, whereas in the embodiment of FIG. 3, the electric wire 7 is wound around the ferrite core 1. The electric wire 7 is fixed to the outer peripheral surface of the ferrite core 1 with an adhesive or the like. It is also possible to provide a helical wire winding groove (3) on the outer peripheral surface of the ferrite core 1.

  The cover 19 has, for example, a locking hole 23 as a locking portion on the opening / closing front end side, and has an engaging projection 24 as an engaging portion on the horizontal substrate portion 21. The ferrite core 1 with electric wires is accommodated on the inner surface side of the cover 19, and the cover 19 is closed, whereby the ferrite core 1 with electric wires is sandwiched and fixed between the inner surface of the cover 19 and the upper surface of the substrate portion 21. The straight portions 7b before and after the winding portion 7a of the electric wire 7 in the ferrite core 1 are inserted and fixed from above into the slits 11 of the holding pieces 10 before and after the substrate portion 21.

  When the ferrite core 1 with an electric wire is accommodated between the cover 19 and the substrate portion 21 so as to be movable in the front-rear direction, the front and rear clamping pieces 10 act as a stopper for the ferrite core 1. The claw 13 of the locking portion 5 is inserted and locked into the hole 15 of the panel 14 (FIG. 1), and the spring lip 12 is elastically contacted with the upper surface of the panel 14.

  Since the substrate portion 21 is flatter than a conventional case having a circular cross section, the structure can be made compact and space-saving. Further, by fixing the electric wire 7 to the front and rear electric wire fixing portions 10, the coil winding portion (winding portion) 7 a of the electric wire 7 from the ferrite core 1 is prevented from being detached. Moreover, since the electric wire 7 is a part of a wire harness and it is not necessary to cover the electric wire fixing | fixed part 10 with the cover 19, the cover 19 is reduced in size and space-saving compared with the conventional case (patent document 2).

  The same applies to the embodiment of FIGS. 1 and 2, but addition (formation) and deletion (not formation) of the coil winding portion 7a to the electric wire 7 of the wire harness based on noise evaluation or the like by the vehicle. It can be done easily. In particular, by using the clamp fixing position (panel hole 15) of the wire harness, setting (addition) of the coil winding portion 7a of the electric wire 7 to the vehicle can be easily performed. Each noise filter structure described above can be easily produced by an operator or a simple jig in the manufacturing process of the wire harness.

  FIG. 4A shows an example of the clamping piece 10 that is the electric wire fixing portion in each of the above embodiments, and projects into the slit 11 on the inner surface of the intermediate portion in the height direction of the pair of left and right clamping piece portions 10a. A pair of inclined protrusions 10b are provided, the electric wire 7 is inserted between the protrusions 10b from above, the locking piece 10a is opened outwardly over the protrusions 10b, and engaged with the lower side of the protrusions 10b. While being prevented from coming off by the protrusion 10b, the inner surface of the holding piece 10a is elastically pressed and held in the radial direction.

  As shown in FIG. 4 (b), instead of the pair of protrusions 10b, one diagonally downward flexible locking piece 10c is provided, and the electric wire 7 is passed over the locking piece 10c and inserted into the slit 11 so that the right and left It is also possible to clamp and fix with the clamping piece 10a. In any case, by fixing the electric wire 7 with the sandwiching piece 10, the detachment of the electric wire winding portion 7a from the tubular portion 2 is reliably prevented.

  FIGS. 5A and 5B show an example of the wire winding groove portion 3 of the tubular portion 2 of the clamp member 6 in the embodiment of FIGS. 1 and 2. As shown in the cross-sectional view of FIG. 5B, the groove 3 has a narrow inlet 3a and a wide inside, and the electric wire 7 pushed into the groove 3 from the narrow inlet 3a is prevented from being separated by the narrow inlet 3a. The positioning property of the wire winding portion 7a in the shaped portion 2 and the workability of winding the wire 7 around the tubular portion 2 are improved. In FIG. 5, the electric wire fixing portion 4 is not shown.

  6 (a) and 6 (b) show a modification of the locking portion 5 in the embodiment of FIG. As shown in FIG. 6A, the locking portion 5 ′ is formed separately from the tubular portion 2, and the ferrite core 1 is inserted inside the tubular portion 2, and the electric wire 7 is disposed on the outer periphery of the tubular portion 2. After being wound, it is fastened and fixed to the outer peripheral side of the cylindrical portion 2 with a band 25 or the like as shown in FIG. The locking portion 5 ′ includes a band 25, a spring lip 12 integrally provided at the longitudinal intermediate portion of the band 25, a claw portion 13 at the center thereof, and a band insertion locking integrally provided at the base end of the band 25. Part (not shown). In FIG. 6, the wire fixing portion 4 and the wire winding groove 3 are not shown.

7, in the embodiment of FIG. 1, the ferrite core 1 is inserted into the bottomed cylindrical portion 27 of the clamp member 26, the cap 27 closes the inlet 27 a of the cylindrical portion 27, and the cylindrical portion 27 An example in which the ferrite core 1 is accommodated and fixed is shown. The cap 28 of this example includes a spring piece 28 a that holds the end of the ferrite core 1 and a protrusion 28 b that engages with a notch 27 b on the inlet side of the cylindrical portion 27. In FIG. 7, the wire fixing portion 4 and the wire winding groove 3 are not shown.

  FIG. 8 shows an example in which, in the embodiment of FIG. 1, the ferrite core 1 is completely fixed in the cylindrical portion 30 of the synthetic resin clamp member 29 by insert molding without gaps or backlash. In FIG. 8, the wire fixing portion 4 and the wire winding groove 3 are not shown.

  9 (a) and 9 (b) use an elastic cylindrical portion 31 having a slit-like upper opening 31a instead of the cylindrical portion 2 of the embodiment of FIG. A spring piece 32 is provided as a stopper for the core 1, the ferrite core 1 is inserted into the cylindrical portion 31 from the upper opening 31 a, and the ferrite core 1 is fixed by the spring force in the reduced diameter direction of the cylindrical portion 31. An example of a clamp member 33 in which the ferrite core 1 is fixed in the front-rear direction by the spring piece 32 and the electric wire 7 is spirally wound around the outer periphery of the cylindrical portion 31 is shown. In FIG. 9, the wire fixing portion 4 and the wire winding groove 3 are not shown.

  10 (a) and 10 (b) use a two-part cylindrical case 34 instead of the cylindrical portion 2 of the embodiment of FIG. 1 and the cover 19 and the substrate portion 21 of the embodiment of FIG. The ferrite core 1 is accommodated and held in the base portion 34a of 34, and a spring piece 35 for holding the ferrite core is provided on the cover portion 34b of the case 34, and an engagement frame piece 37 for the locking projection 36 of the base portion 34a is provided. An example of a clamp member 38 in which the cover portion 34b is closed and the electric wire 7 is spirally wound around the outer periphery of the case 34 is shown. The electric wire 7 may be wound around the outer periphery of the ferrite core 1 instead of the outer periphery of the case 34. In FIG. 10, the wire fixing portion 4 and the wire winding groove 3 are not shown.

  11 uses a case 34 similar to the example of FIG. 10 (no spring piece), and the ferrite core 1 around which the electric wire 7 is wound is accommodated in the case, and a resin material such as hot melt resin or potting resin is accommodated in the case. The example of the clamp member 40 which inject | poured 39 and hold | maintained and fixed the ferrite core 1 is shown.

  In the above embodiments, the clamp members 6, 6 ′ and 22 are fixed to the panel 14 by the locking portion 5. However, instead of the locking portion 5, a bolt insertion bracket (not shown) or slide fixing is used. A through bracket or the like (not shown) is provided on the clamp members 6, 6 ′, 22, or the locking members 5 are excluded, and the clamp members 6, 6 ′, 22 are attached together with other wires of the wire harness. It is also possible to route the cable and fix it to the panel 14 or the like by tape winding or the like.

  The noise filter structure of a harness according to the present invention can be used, for example, as part of a wire harness of an automobile to absorb noise of an electrical component in a vehicle.

1 Ferrite core (magnetic material)
2, 2 'cylindrical part 3 groove part 4, 4' electric wire fixing part 5 locking part 6, 6 ', 22 clamp member 7 electric wire 7a winding part 8 hole part 10 clamping piece (electric wire fixing part)
14 panels

Claims (1)

  A magnetic body is held inside the cylindrical portion of the insulating clamp member, a spiral groove portion for winding an electric wire is provided on the outer peripheral side of the cylindrical portion, and the inlet of the groove portion on the outer periphery of the cylindrical portion Is formed narrower than the inside of the groove portion, and the winding portion of the wire harness wire is pushed into the groove portion from the inlet, and is arranged in a spiral shape. A harness noise filter structure characterized in that separation of the winding portion is prevented, and the electric wire following the start and end of the winding portion is fixed to each electric wire fixing portion of the clamp member.

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