JP2016201728A - Noise filter and holder for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a plurality of conducting paths to be positioned and to be held.SOLUTION: A noise filter F comprises: a ferrite core 20 formed with an insertion hole 22 for inserting wires 41, 42 and 43 (conducting paths); a holder 30 housed in the insertion hole 22; and a plurality of holding grooves 31 and 32 being formed in the holder 30 and holding the wires 41, 42 and 43 in states regulating movement thereof outward in a radial direction. The plurality of wires 41, 42 and 43 can be individually positioned and held by the plurality of holding grooves 31 and 32. Further, influence of noise among the wires 41, 42 and 43 is reduced by holding the plurality of wires 41, 42 and 43 in separate grooves 31 and 32.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a noise filter and a noise filter holder.

  Patent Document 1 discloses a noise filter that can stably hold a plurality of types of conductive paths having different outer diameters inside a ferrite core. The ferrite core is accommodated in the first and second divided cases, and the first divided case is formed with a pair of elastically deformable holding portions for holding the conductive path in the radial direction. A pressing portion is formed to press the pair of sandwiching portions in a direction in which the pair of holding portions approach each other. The pair of sandwiching portions can stably hold the conductive path by elastically deforming according to the outer diameter of the conductive path.

Japanese Patent No. 5526007

  The noise filter can selectively hold a plurality of types of conductive paths having different outer diameters one by one, but cannot position and hold a plurality of conductive paths.

  The present invention has been completed based on the above situation, and an object thereof is to enable positioning and holding a plurality of conductive paths.

The noise filter of the first invention is
A ferrite core having an insertion hole through which a conductive path is inserted;
A holder accommodated in the insertion hole;
It is characterized in that it is provided with a plurality of holding grooves formed in the holder and holding the conductive path in a state of restricting movement outward in the radial direction.

The noise filter holder of the second invention is:
A noise filter is configured by being accommodated in an insertion hole formed in the ferrite core,
It is characterized in that it has a plurality of holding grooves for holding the conductive path in a state in which movement outward in the radial direction is restricted.

  A plurality of conductive paths can be individually positioned and held by the plurality of holding grooves. Moreover, the influence of the noise between conductive paths is reduced by hold | maintaining a several conductive path in a separate holding groove.

Sectional drawing of the noise filter of Example 1 XX sectional view of FIG. Front view of holder

  (A) In the noise filter of the first invention, the plurality of holding grooves may be formed on the outer peripheral surface of the holder and spaced apart in the circumferential direction. According to this configuration, the work of holding the conductive path in the holding groove is easy.

  (B) In the noise filter of the first invention, in (a), the circumferential width dimension of the holding groove may be narrowed from the outer peripheral side of the holder toward the center side. According to this configuration, a plurality of conductive paths having different outer diameters can be held in one holding groove.

(C) In the noise filter according to the first aspect of the present invention, in (a) or (b), the inner surface of the holding groove is formed with a recess for locking the conductive path in a radially restricted state. Also good. According to this configuration, the conductive path can be reliably positioned in the holding groove.
(D) In the noise filter of the first invention, the plurality of holding grooves may be capable of holding at least two types of the conductive paths having different diameters. According to this configuration, at least two types of conductive paths having different diameters can be positioned and held.

<Example 1>
A first embodiment of the present invention will be described below with reference to FIGS. The noise filter F of the present embodiment is attached so as to surround the wire harness W, and reduces or eliminates electromagnetic noise of the plurality of electric wires 41, 42, and 43 constituting the wire harness W. The wire harness W includes two large-diameter electric wires 41 (conducting paths described in claims), two small-diameter electric wires 42 (conducting paths described in claims), and two small-diameter electric wires 43 (described in claims). Conductive path). Each of the electric wires 41, 42, and 43 is a well-known covered electric wire in which a conductor is surrounded by an insulating coating. All of the cross-sectional shapes cut at right angles to the axes of the electric wires 41, 42, 43 are circular. The outer diameters of the three types of electric wires 41, 42, 43 are the largest for the large-diameter electric wire 41 and the smallest for the small-diameter electric wire 43.

  The noise filter F includes a filter case 10, a ferrite core 20, and a holder 30 (a holder for the noise filter F according to the claims). The filter case 10 is a single part in which a pair of case constituent bodies 11 having a semicircular arc shape are connected by a hinge 12. The noise filter F is configured in a cylindrical shape by deforming the hinge 12 to unite the pair of case components 11. In addition, the two case components 11 combined are brought into a combined state by the locking of the locking protrusions 13 formed on one case component 11 and the elastic locking pieces 14 formed on the other case component 11. Retained. A pair of stoppers 15 are formed at both ends in the axial direction of the filter case 10 so as to protrude concentrically toward the center in the radial direction.

  The ferrite core 20 is configured by combining a pair of core structural bodies 21 having a semicircular arc shape. Each core structure 21 is accommodated in the case structure 11. When the case structure 11 is combined, the pair of core structures 21 are combined, and in the filter case 10, the ferrite core 20 having a penetrating cylindrical shape is configured coaxially with the filter case 10. The central hole of the ferrite core 20 serves as an insertion hole 22 through which the plurality of electric wires 41, 42, 43 are inserted. The cross-sectional shape cut at right angles to the axis of the insertion hole 22 is a circle.

  Since the outer diameter of the ferrite core 20 is the same as the inner diameter of the filter case 10, the ferrite core 20 does not play back (relative displacement) in the radial direction in the filter case 10. Further, the ferrite core 20 is held in a state where the core components 21 are in close contact with each other. Further, the inner diameter of the ferrite core 20 (insertion hole 22) is slightly larger than the inner diameter of the stopper 15. The dimension of the ferrite core 20 in the axial direction is the same as the distance between the pair of stoppers 15. Therefore, in the filter case 10, the ferrite core 20 is held between the pair of stoppers 15 so as not to be loose (relative displacement) in the axial direction.

  The holder 30 is a single component made of synthetic resin, and has a cylindrical shape coaxial with the filter case 10 and the ferrite core 20 as a whole. The holder 30 is accommodated in the insertion hole 22 of the ferrite core 20. Since the outer diameter of the holder 30 is the same as the inner diameter of the insertion hole 22 (ferrite core 20), the holder 30 does not play back (relative displacement) in the radial direction in the insertion hole 22. Further, the outer diameter of the holder 30 is slightly larger than the inner diameter of the stopper 15. The dimension of the holder 30 in the axial direction is the same as the distance between the pair of stoppers 15 as in the ferrite core 20. Therefore, inside the filter case 10, the holder 30 is held between the pair of stoppers 15 so as not to be loose (relative displacement) in the axial direction.

  The holder 30 is formed with four large-diameter holding grooves 31 (the holding grooves described in the claims) and four small-diameter holding grooves 32 (the holding grooves described in the claims). Each holding groove 31, 32 has a form cut out from the outer peripheral surface of the holder 30 toward the center (the axis of the holder 30), and is open to both end surfaces in the axial direction of the holder 30. The two types of holding grooves 31 and 32 are arranged such that the large diameter holding grooves 31 and the small diameter holding grooves 32 are alternately arranged in the circumferential direction. Each holding groove 31 and 32 is an independent form which is not in communication with the other holding grooves 31 and 32, respectively. That is, the opening area of each holding groove 31, 32 on the outer peripheral surface of each holder 30 is different from the opening area of the other holding grooves 31, 32.

  Further, in the holder 30, the region between the adjacent holding grooves 31 and 32 in the circumferential direction is a plate-like extending portion that extends in a cantilevered manner from the axial center portion 33 of the holder 30 outward in the radial direction. 34. Although the number of the holding grooves 31 and 32 is eight, the number of the plate-like extending portions 34 is also eight. Each plate-like extension part 34 can be elastically bent in the circumferential direction with the shaft center part 33 as a substantially fulcrum. By causing the plate-like extension portion 34 to bend elastically in the circumferential direction, the spacing in the circumferential direction of the holding grooves 31 and 32 changes so as to become wider or narrower.

  Each of the large-diameter holding grooves 31 has a pair of inner surfaces facing each other with a gap in the circumferential direction. And the space | interval of the circumferential direction of the inner surface which makes a pair becomes narrow gradually toward the center (axial center) side from the outer peripheral side of the holder 30. As shown in FIG. A pair of large-diameter recesses 35 (recesses recited in the claims) formed of arcuate surfaces are formed on the inner surfaces forming a pair of large-diameter holding grooves 31 so as to face each other in the circumferential direction. The curvature of the arc of the large diameter concave portion 35 is substantially the same as that of the outer peripheral surface of the large diameter electric wire 41.

  Each of the small-diameter holding grooves 32 has a pair of inner surfaces facing each other with a gap in the circumferential direction. And the space | interval of the circumferential direction of the inner surface which makes a pair becomes narrow gradually toward the center (axial center) side from the outer peripheral side of the holder 30. As shown in FIG. A pair of small-diameter recesses 36 (recesses described in the claims) formed of arcuate surfaces are formed on the inner surfaces forming a pair of the small-diameter holding grooves 32 so as to face each other in the circumferential direction. The curvature of the arc of the small diameter recess 36 is substantially the same as that of the outer peripheral surface of the small diameter electric wire 42. Similarly, a pair of small-diameter recesses 37 (recesses described in claims) are formed on the inner surfaces of the pair of small-diameter holding grooves 32 so as to face each other in the circumferential direction. The curvature of the arc of the small-diameter concave portion 37 is substantially the same as that of the outer peripheral surface of the small-diameter electric wire 43. The small-diameter concave portion 37 is disposed closer to the small-diameter axis than the small-diameter concave portion 36.

  Next, an example of how the noise filter F is used will be described. When attaching the noise filter F to the wire harness W, first, the electric wires 41, 42, 43 are respectively inserted into the holding grooves 31, 32 in a state before the holder 30 is accommodated in the insertion hole 22 of the ferrite core 20. Accommodate. At this time, the electric wires 41, 42, and 43 are pushed into the holding grooves 31 and 32 from the opening on the outer peripheral surface of the holder 30 with the axis line parallel to the holder 30.

  Only the large-diameter electric wire 41 is accommodated in the large-diameter holding groove 31. As shown in FIG. 1, since there are two large-diameter electric wires 41, one large-diameter electric wire 41 is accommodated in each of the two large-diameter holding grooves 31 out of the four large-diameter holding grooves 31. . The large-diameter wire 41 accommodated in the large-diameter holding groove 31 is held in a state in which relative movement in the radial direction with respect to the holder 30 is restricted by being fitted into the pair of large-diameter concave portions 35. At this time, the outer peripheral portion of the insulation coating of the large-diameter electric wire 41 may be deformed, or the plate-like extending portion 34 may be elastically bent in the circumferential direction so that the circumferential interval of the large-diameter holding groove 31 is increased.

  The small-diameter holding groove 32 accommodates one or both of the small-diameter electric wire 42 and the small-diameter electric wire 43, but cannot accommodate the large-diameter electric wire 41. There are two small-diameter wires and two small-diameter wires 43, but one small-diameter electric wire 42 and one small-diameter electric wire 42 and 1 are included in one of the four small-diameter holding grooves 32. A small-diameter electric wire 43 is accommodated. Another small-diameter holding groove 32 accommodates one small-diameter electric wire 42. Furthermore, one small-diameter electric wire 43 is accommodated in another small-diameter holding groove 32.

  The small-diameter electric wire 42 accommodated in the small-diameter holding groove 32 is held in a state in which the relative movement in the radial direction with respect to the holder 30 is restricted by being fitted into the pair of small-diameter concave portions 36. In addition, the thin wire 43 accommodated in the small thin holding groove 32 is held in a state in which the relative movement in the radial direction with respect to the holder 30 is restricted by being fitted into the pair of thin concave portions 37. Is done. Since the small-diameter electric wire 42 and the small-diameter electric wire 43 that are accommodated in the single small-diameter holding groove 32 and positioned by the recesses 36 and 37 are arranged with a gap in the radial direction, There is no risk of affecting each other.

  Further, when the small-diameter electric wire 42 is fitted into the small-diameter concave portion 36 or when the small-diameter electric wire 43 is fitted into the small-diameter concave portion 37, the outer peripheral portions of the insulation coating of the small-diameter electric wire 42 and the small-diameter electric wire 43 are deformed. Alternatively, the plate-like extension portion 34 may be elastically bent in the circumferential direction so that the interval in the circumferential direction of the small-diameter holding groove 32 is increased.

  As described above, the noise filter F of the present embodiment includes the ferrite core 20 in which the insertion hole 22 through which the electric wires 41, 42, and 43 having different diameters are inserted and the holder 30 accommodated in the insertion hole 22. . The holder 30 is formed with a plurality of holding grooves 31 and 32 that hold the electric wires 41, 42, and 43 in a state in which movement in the radially outward direction is restricted. The plurality of holding grooves 31 and 32 formed in the holder 30 can individually position and hold a plurality of electric wires 41, 42 and 43 having different diameters.

  Further, the plurality of electric wires 41, 42, 43 are held in separate holding grooves 31, 32 spaced apart in the circumferential direction. Thereby, the electric wires 41, 42, 43 accommodated in the different holding grooves 31, 32 are also arranged in the circumferential direction. Therefore, the influence of noise between the electric wires 41, 42, 43 accommodated in the different holding grooves 31, 32 is reduced.

  In addition, since the plurality of holding grooves 31 and 32 are formed on the outer peripheral surface of the holder 30 and are spaced apart in the circumferential direction, the work of holding the electric wires 41, 42, and 43 in the holding grooves 31 and 32 is performed. Is easy. Further, since the width dimension in the circumferential direction of the small-diameter holding groove 32 is narrowed from the outer peripheral side to the center side of the holder 30, the outer diameter dimension is different from that of the single small-diameter holding groove 32. A plurality of electric wires (small-diameter electric wire 42 and small-diameter electric wire 43) can be held. Moreover, since the recessed part 35,36,37 which locks the electric wires 41,42,43 in the movement control state to radial direction is formed in the inner surface of the holding grooves 31,32, the electric wires 41,42,43 are attached. Positioning in the holding grooves 31 and 32 can be ensured.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, each holding groove is an independent form that is not in communication with other holding grooves. For example, a plurality of holding grooves are branched from a common insertion opening opened on the outer peripheral surface of the holder. You may do it.
(2) In the above embodiment, the width dimension of the holding groove in the circumferential direction is narrowed from the outer periphery side of the holder toward the center side, but the width dimension of the holding groove is substantially constant in the entire radial region. There may be.
(3) In the above embodiment, two types of holding grooves are formed in the holder. However, only one type of holding groove may be used, or three or more types may be used.
(4) In the above embodiment, the two types of holding grooves provided in the same number are alternately arranged in the circumferential direction. However, the two types of holding grooves in the same number are arranged in the circumferential direction in a form other than the alternating arrangement. You may arrange.
(5) In the above embodiment, eight holding grooves are formed in the holder, but the number of holding grooves formed in the holder may be seven or less, or nine or more.
(6) In the above embodiment, one or two recesses are formed in one holding groove, but the number of recesses formed in one holding groove may be three or more.
(7) In the above embodiment, the concave portion has an arc shape, but the shape of the concave portion may be a triangle or a trapezoid.
(8) In the above embodiment, the recesses are formed in pairs on both of the pair of inner surfaces constituting the holding groove, but the recesses are formed on only one of the pair of inner surfaces. May be.
(9) In the above-described embodiment, the concave portion for locking the conductive path is formed on the inner surface of the holding groove, but such a concave portion may not be formed.
(10) In the above embodiment, the conductive path is composed of one electric wire, but the present invention can also be applied to a case where the conductive path is a bundle of a plurality of electric wires.
(11) In the above embodiment, all three types of electric wires constituting the wire harness are provided by two, but the number of electric wires of each type constituting the wire harness can be set as appropriate. .
(12) In the above embodiment, three types of electric wires having different outer diameters are simultaneously inserted into the insertion holes. However, the number of types of electric wires (number of types of electric wires constituting the wire harness) inserted into the insertion holes is: Two or less types may be sufficient, and four or more types may be sufficient.
(13) In the above embodiment, the ferrite core is formed by combining two semicircular arc core components, but the present invention is also applicable to the case where the ferrite core is a non-divided type single component. it can.
(14) In the above embodiment, the insertion hole is circular. However, the present invention is not limited to this, and the insertion hole may be non-circular.
(15) In the above embodiment, the ferrite core has an annular shape and only one insertion hole is formed in the ferrite core. However, in the present invention, the outer peripheral shape of the ferrite core is oval or elliptical. The present invention can also be applied to a case where a plurality of insertion holes are formed in the ferrite core. In this case, the noise filter holder can be accommodated in each insertion hole.

F ... Noise filter 20 ... Ferrite core 22 ... Insertion hole 30 ... Holder (holder for noise filter)
31 ... Retaining groove for large diameter (holding groove)
32 ... Retaining groove for small diameter (holding groove)
35 ... Recess for large diameter (recess)
36 ... Recess for small diameter (recess)
37 ... Recess for small diameter (recess)
41 ... Large-diameter wire (conductive path)
42 ... Small-diameter wire (conductive path)
43 ... Thin wire (conducting path)

Claims (6)

A ferrite core having an insertion hole through which a conductive path is inserted;
A holder accommodated in the insertion hole;
A noise filter comprising: a plurality of holding grooves formed in the holder and holding the conductive path in a state in which movement in a radially outward direction is restricted.   The noise filter according to claim 1, wherein the plurality of holding grooves are formed on the outer peripheral surface of the holder and are spaced apart in the circumferential direction.   3. The noise filter according to claim 2, wherein a width dimension of the holding groove in a circumferential direction becomes narrower from an outer peripheral side of the holder toward a central side.   4. The noise filter according to claim 2, wherein a concave portion that locks the conductive path in a radially restricted movement state is formed on an inner surface of the holding groove. 5.   5. The noise filter according to claim 1, wherein the plurality of holding grooves are capable of holding at least two types of the conductive paths having different diameters. A noise filter holder that constitutes a noise filter by being accommodated in an insertion hole formed in a ferrite core,
A noise filter holder, comprising: a plurality of holding grooves for holding the conductive path in a state in which movement outward in the radial direction is restricted.

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