Electromagnetic wave absorption member fixation structure and protector

Abstract

To provide an electromagnetic wave absorption member fixation structure and the like with a simple structure capable of easily fixing an electromagnetic wave absorption member.SOLUTION: A protector body 3 and a protector cover 5 are box-shaped members for housing and protecting an electromagnetic wave absorption member 7. On inner surfaces of the protector body 3 and the protector cover 5, a plurality of ribs 15 protruding to an opposite inner surface are provided. The ribs 15 have shapes of tapered ends. A width of the electromagnetic wave absorption member 7 is greater than a width between the ribs 15 of the protector body 3, so that pushing the electromagnetic wave absorption member 7 into the protector body 3 crushes the ends of the ribs 15. Thus, by the electromagnetic wave absorption member 7 being pressed inside the protector body 3, the electromagnetic wave absorption member 7 is gripped by the ribs 15 formed on side walls facing each other from a width direction and is fixed to the protector body 3.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a fixing structure for an electromagnetic wave absorbing member that is attached to an electric wire in, for example, an automobile, and a protector used therein. [Background technology]

[0002] In recent years, for example in hybrid automobiles, etc., wire harnesses connected to various electrical devices require shielding measures because noise generated from the wire harnesses can enter radios, etc. As an example of such an electromagnetic shielding structure, there is a method in which a metallic electromagnetic shielding tube is used, and the end of the electromagnetic shielding tube is covered with a flexible conductor such as a braided wire for connection.

[0003] Recently, an increasing number of vehicles are using electromagnetic wave absorbing members made of ferrite cores and the like in addition to braided wires to prevent noise. In this case, it is necessary to fix the electromagnetic wave absorbing member to the wire harness. However, due to the characteristics of the ferrite core, it is necessary to protect it from cracking, so it is necessary to protect the electromagnetic wave absorbing member using an exterior part or to select an electromagnetic wave absorbing member with an annular case and fix it to the wire harness.

[0004] As a method for fixing such an electromagnetic wave absorbing member, for example, a method has been proposed in which, for an electromagnetic wave absorbing member having a magnetic core housed in an annular case, a protector capable of housing the electromagnetic wave absorbing member and a cable tie for fixing the electromagnetic wave absorbing member housed inside the protector are used, and the cable tie is arranged along a protrusion on the outer surface of the annular case and a groove provided on the side of the protector to fix the electromagnetic wave absorbing member (Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-72389 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in Patent Document 1, since an annular case is used, it is applicable only when a magnetic core is housed in the annular case. Therefore, the size and shape of the protector depend on the size and shape of the annular case, making it difficult to save space and reducing the freedom of design of the protector. In addition, since the outer surface of the protector is uneven due to the guide of the cable tie for fixing the electromagnetic wave absorbing member, the workability of covering the braided wire, etc. is poor.

[0007] Furthermore, in order to secure the electromagnetic wave absorbing material with a cable tie, the cable tie must be inserted through a hole in the protector, rotated downward, and positioned along the groove in the protector and the protrusion on the annular case, making the securing process complicated and difficult to work with.

[0008] In addition, the size of the electromagnetic wave absorbing member and the housing of the protector cannot be made the same, and the size of the inside of the protector is set to be slightly larger than the size of the electromagnetic wave absorbing member. Therefore, even if the electromagnetic wave absorbing member is fixed at one point with a cable tie, the electromagnetic wave absorbing member may swing slightly inside the protector around the fixed part with the cable tie, and there is a risk of the magnetic core being damaged by vibration. In response to this, if the cable tie is fixed at two or more points, such swinging can be suppressed, but the above-mentioned workability will be further deteriorated.

[0009] The present invention has been made in view of the above problems, and has an object to provide an electromagnetic wave absorbing member fixing structure etc. that is simple in structure and can easily fix an electromagnetic wave absorbing member. [Means for solving the problem]

[0010] In order to achieve the above-mentioned object, the first invention is a structure for fixing an electromagnetic wave absorbing member to an electric wire, comprising an electric wire, an electromagnetic wave absorbing member arranged on the outer periphery of the electric wire, and a protector in which the electromagnetic wave absorbing member is housed, the protector having a rib protruding on its inner surface, and the electromagnetic wave absorbing member being fixed to the protector by being sandwiched between the opposing ribs.

[0011] The ribs may have tapered tips, the distance between opposing ribs before the electromagnetic wave absorbing member is inserted is smaller than the size of the corresponding portion of the electromagnetic wave absorbing member, and the electromagnetic wave absorbing member may be pressed into the protector by crushing the tips of the ribs.

[0012] It is preferable that the rib is formed on the inner surface of the protector in a direction substantially perpendicular to the longitudinal direction of the electric wire.

[0013] A groove may be formed in at least a part of an outer surface of the electromagnetic wave absorbing member in a direction perpendicular to the axial direction of the electric wire, and the rib may be disposed at a position corresponding to the groove.

[0014] The electromagnetic wave absorbing member may be covered with a braided wire and have a plurality of protrusions protruding from an inner surface of the protector in areas other than the ribs, with the electromagnetic wave absorbing member being sandwiched between the protrusions facing each other.

[0015] The rib may have a flat tip and be in surface contact with the outer surface of the electromagnetic wave absorbing member, and the tip of the rib may have a sliding suppression structure that increases the coefficient of friction with the outer surface of the electromagnetic wave absorbing member.

[0016] The electromagnetic wave absorbing member may be in a split shape.

[0017] According to the first aspect of the present invention, the electromagnetic wave absorbing member is sandwiched and fixed by the ribs provided inside the protector, so that the electromagnetic wave absorbing member can be fixed simply by housing the member in the protector. This makes it easy to fix the electromagnetic wave absorbing member. In addition, the electromagnetic wave absorbing member can be applied to a member that does not have an annular case. In addition, since there is no need to provide irregularities on the outer surface of the protector, the work of covering the braided wire is also easy.

[0018] Furthermore, by tapering the tips of the ribs and making the distance between the opposing ribs before the electromagnetic wave absorbing member is inserted smaller than the size of the corresponding portion of the electromagnetic wave absorbing member, the tips of the ribs can be crushed to press the electromagnetic wave absorbing member into the protector, thereby reliably fixing the electromagnetic wave absorbing member inside the protector.

[0019] Furthermore, by forming the ribs in a direction substantially perpendicular to the longitudinal direction of the electric wires, movement or displacement of the electromagnetic wave absorbing member inside the protector can be suppressed.

[0020] In this case, by forming a groove in a direction perpendicular to the axial direction of the electric wire on a part of the outer surface of the electromagnetic wave absorbing member and arranging the rib and the groove at a corresponding position, it is easy to position the electromagnetic wave absorbing member in the protector. Furthermore, as described above, when combined with the method of pressing the tip of the rib by crushing it, it is possible to press the electromagnetic wave absorbing member straight into the protector. Furthermore, since the groove and the rib fit together after the press-fitting, it is possible to suppress the electromagnetic wave absorbing member from shifting in the longitudinal direction of the electric wire.

[0021] In addition, by providing a plurality of protrusions protruding from the inner surface of the protector in areas other than the above-mentioned ribs, even when the electromagnetic wave absorbing member is covered with a braided wire, the electromagnetic wave absorbing member and the braided wire are sandwiched between the mutually opposing protrusions, making it possible to suppress the shifting of the electromagnetic wave absorbing member and the shifting of the braided wire. In addition, by using the braided wire, the noise shielding performance of the braided wire can be ensured.

[0022] Furthermore, if the tips of the ribs are flat rather than tapered, and a sliding prevention structure is used on the flat surface, it is possible to prevent the electromagnetic wave absorbing member from moving inside the protector due to friction.

[0023] Furthermore, if the electromagnetic wave absorbing member has a half-split shape, it is easy to attach it to the electric wire.

[0024] A second invention is a protector for housing and protecting an electromagnetic wave absorbing member, the protector having ribs protruding inward from opposing sides, the ribs having tapered tips, and when housing an electromagnetic wave absorbing member in the protector, the tips of the ribs can be crushed to press the electromagnetic wave absorbing member into the protector.

[0025] According to the second aspect of the present invention, the tip of the rib is tapered to be easily deformable, so that the electromagnetic wave absorbing member can be press-fitted into the protector and fixed thereto. Effect of the Invention

[0026] According to the present invention, it is possible to provide an electromagnetic wave absorbing member fixing structure and the like that is capable of easily fixing an electromagnetic wave absorbing member with a simple structure. [Brief description of the drawings]

[0027] [Figure 1] FIG. 2 is an exploded perspective view of the electromagnetic wave absorbing member fixing structure 1. [Diagram 2] 4A is a bottom view of a protector cover 5, and FIG. 4B is a plan view of a protector main body 3. FIG. [Diagram 3] 2 is an exploded perspective view of the electromagnetic wave absorbing member fixing structure 1 in a state in which the electromagnetic wave absorbing member 7 is attached to the electric wire 9. FIG. [Figure 4] 1A is a plan view of an electromagnetic wave absorbing member 7, FIG. 1B is a plan view of a protector body 3, and FIG. 1C is an enlarged view of part C in FIG. [Diagram 5] 1A is a plan view showing a state in which an electromagnetic wave absorbing member 7 is press-fitted into a protector body 3, FIG. 1B is an enlarged view of part C in FIG. 1A, and FIG. 1C is a view showing another embodiment of FIG. [Figure 6] FIG. 10(a) is a diagram showing another embodiment of the protector body 3, and FIG. 10(b) is a diagram showing a state in which an electromagnetic wave absorbing member 7 is press-fitted into the protector body 3 of FIG. [Figure 7] FIG. 3 is a partially transparent perspective view showing a protector main body 3a. [Figure 8] FIG. [Figure 9] 1A is a plan view showing a state in which an electromagnetic wave absorbing member 7 is housed in a protector main body 3a, and FIG. 1B is an enlarged view of a portion E in FIG. [Figure 10] FIG. 4 is a perspective view showing a protector main body 3b. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is an exploded perspective view of an electromagnetic wave absorbing member fixing structure 1. The electromagnetic wave absorbing member fixing structure 1 is mainly composed of an electric wire 9, an electromagnetic wave absorbing member 7, a protector, etc. The electromagnetic wave absorbing member fixing structure 1 is a structure for fixing the electromagnetic wave absorbing member 7 to the electric wire 9.

[0029] The electromagnetic wave absorbing member 7 has a split shape, and is formed into a ring shape by combining the two. The electromagnetic wave absorbing member 7 may be a ferrite core itself, or a ferrite core housed in a case. When the electromagnetic wave absorbing member 7 is housed in a case, it may not be completely separated, but may be connected by a hinge or the like. The electromagnetic wave absorbing member 7 may not be split in half, but may be integrally formed into a ring shape. Although an example is shown in which the electromagnetic wave absorbing member 7 is attached to the outer periphery of one electric wire 9, it may be provided collectively on the outer periphery of multiple electric wires 9.

[0030] The protector body 3 and the protector cover 5 are box-shaped members for housing and protecting the electromagnetic wave absorbing member 7. The protector body 3 is open at the top, and the opening is closed by the protector cover 5. At this time, the engagement portion 13 of the protector cover 5 engages with the engagement portion 11 of the protector body 3, and the protector cover 5 is fixed to the protector body 3. In the present invention, the protector body 3 and the protector cover 5 are collectively referred to simply as the protector.

[0031] The opposing side walls of the protector body 3 are each provided with an electric wire penetration portion 17. The electric wire penetration portion 17 is formed by cutting out a part of the side wall, and serves as a portion through which the electric wire penetrates the protector body 3.

[0032] Fig. 2(a) is a bottom view of the protector cover 5, and Fig. 2(b) is a plan view of the protector body 3. A plurality of ribs 15 protruding toward the opposing inner surface are provided on the inner surfaces of the protector body 3 and the protector cover 5. The ribs 15 are formed on the inner surfaces of the protector body 3 and the protector cover 5 in a direction approximately perpendicular to the longitudinal direction of the housed electric wires (the left-right direction in the figure, hereinafter referred to as the "axial direction").

[0033] When the protector cover 5 is closed on the protector body 3, the ribs 15 are formed, for example, so as to be continuous over the entire circumference. That is, the protector body 3 and the protector cover 5 are provided with ribs 15 of substantially the same shape at substantially the same corresponding positions. In the illustrated example, three ribs 15 are formed parallel to each other at a predetermined interval, but the number is not particularly limited as long as it is two or more. The shape of the ribs 15 will be described in detail later.

[0034] 3 is a diagram showing a state in which two halves of the electromagnetic wave absorbing member 7 are butted together to form a ring shape, and the electromagnetic wave absorbing member 7 is arranged on the outer periphery of the electric wire 9. In this state, a cylindrical braided wire 19 is provided so as to cover the electric wire 9 and the electromagnetic wave absorbing member 7 as necessary. The braided wire 19 may be fixed to the electric wire 9 or the electromagnetic wave absorbing member 7 by, for example, tape. Note that the braided wire 19 is not shown in the following figures.

[0035] FIG. 4(a) is a plan view of the electromagnetic wave absorbing member 7, and FIG. 4(b) is a plan view of the protector body 3. FIG. 4(c) is an enlarged view of part C in FIG. 4(b) (the protector body 3 is hatched in the enlarged view, and the same applies below). As shown in FIG. 4(c), the rib 15 has a tapered shape at the tip. As shown in the figure, the entire rib 15 does not have to be tapered (i.e., approximately triangular). For example, the tip may be tapered only near the tip, such as in a home base shape, and the tip may not be completely sharp, but may be slightly chamfered. In addition, considering the reinforcing effect of the rib 15, it is preferable that the base side of the rib 15 is wider, and in this case, the angle of the tip of the rib 15 may be more than 60°.

[0036] If the direction perpendicular to the wires 9 in the plan view of the electromagnetic wave absorbing member 7 (the vertical direction in the figure, hereinafter referred to as the "width direction") is A and the distance between the tips of the ribs 15 on the opposing side walls of the protector body 3 is B, then the relationship is A>B. In other words, the distance between the opposing ribs 15 of the protector body 3 before the electromagnetic wave absorbing member 7 is inserted is smaller than the size of the corresponding portion of the electromagnetic wave absorbing member 7.

[0037] Fig. 5(a) is a plan view showing the state in which the electromagnetic wave absorbing member 7 is housed in the protector body 3, and Fig. 5(b) is an enlarged view of part C in Fig. 5(a). As described above, the width of the electromagnetic wave absorbing member 7 is greater than the width between the ribs 15 of the protector body 3, so when the electromagnetic wave absorbing member 7 is pressed into the protector body 3, the tip portions of the ribs 15 are crushed, as shown in Fig. 5(b). In other words, the electromagnetic wave absorbing member 7 is pressed into the protector body 3 by crushing the tip portions of the ribs 15.

[0038] At this time, the side walls of the protector body 3 are subjected to a force that tends to expand outward due to a reaction force from the electromagnetic wave absorbing member 7, but since the ribs 15 have a reinforcing effect, such deformation of the side walls is suppressed, and the electromagnetic wave absorbing member 7 can be held more securely.

[0039] In this state, by closing the protector cover 5, the protector body 3 is closed and the electromagnetic wave absorbing member 7 housed therein can be held. As described above, the protector cover 5 also has the same ribs 15 as the protector body 3, so that the electromagnetic wave absorbing member 7 may be press-fitted into the protector cover 5 depending on the shape of the electromagnetic wave absorbing member 7.

[0040] In addition, ribs 15 are also provided on the upper bottom surface of the protector body 3 and the bottom surface side of the protector cover 5. In this case, if the total height of the electromagnetic wave absorbing member 7 is greater than the distance between the ribs 15 in the vertical direction (the height from the tip of the lower rib 15 to the tip of the upper rib 15 when the protector body 3 and the protector cover 5 are engaged), the electromagnetic wave absorbing member 7 is accommodated inside the protector with the tips of the ribs 15 also pressed down in the vertical direction.

[0041] If the electromagnetic wave absorbing member 7 is press-fitted into the protector body 3 at least in the width direction, the protector cover 5 does not need to have the ribs 15 in the width direction. Also, if the electromagnetic wave absorbing member 7 is sandwiched between the ribs 15 in the width direction and sufficiently fixed, the tips of the ribs 15 do not need to be crushed in the vertical direction. In this case (i.e., if the distance between the upper and lower ribs 15 is the same or slightly greater than the height of the electromagnetic wave absorbing member 7), the upper and lower ribs 15 are not necessarily required, and even if the ribs 15 are provided, they simply function as reinforcing parts of the member. In this way, if the upper and lower ribs 15 are not crushed, the work of attaching the protector cover 5 to the protector body 3 is easy.

[0042] In this way, by press-fitting the electromagnetic wave absorbing member 7 into the protector body 3, the electromagnetic wave absorbing member 7 is sandwiched at least in the width direction by the ribs 15 formed on the opposing side walls and fixed to the protector body 3. Therefore, the electromagnetic wave absorbing member 7 can be fixed to the protector without using a cable tie or the like. Note that, if necessary, the electric wire 9 passing through the electric wire penetration portion 17 of the protector body 3 may be fixed with a band or the like.

[0043] The material of the protector is not particularly limited, but the protector body 3 and the protector cover 5 are made of, for example, resin so that the electromagnetic wave absorbing member 7 can be press-fitted by deformation of the tip of the rib 15. Alternatively, rubber such as EPDM or soft alloys such as lead and aluminum alloys may be used. In order to reliably hold the electromagnetic wave absorbing member 7 by press-fitting, it is desirable that the portion of the electromagnetic wave absorbing member 7 that is sandwiched by the ribs 15 is flat. For example, if the electromagnetic wave absorbing member 7 has a circular cross-sectional shape, the area sandwiched by the ribs 15 when pressed-fitted is small. For this reason, it is desirable that the electromagnetic wave absorbing member 7 is a polygon (approximately octagonal in the illustrated example) with at least both opposing side surfaces being flat surfaces that are approximately parallel to each other (both side surfaces are straight lines that are parallel to each other in a cross section perpendicular to the longitudinal direction of the electric wire 9).

[0044] In addition, both side surfaces of the electromagnetic wave absorbing member 7 do not need to be completely flat, and grooves may be provided in some parts. In the example shown in Fig. 5(c), grooves 20 are formed in at least part of the outer side surface of the electromagnetic wave absorbing member 7 in a direction perpendicular to the axial direction of the electric wires 9 (vertical direction). Since the grooves 20 are provided in positions corresponding to the ribs 15, the tips of the ribs 15 are crushed in the grooves 20. That is, in this case, the width of the grooves 20 in the electromagnetic wave absorbing member 7 (i.e., the width obtained by subtracting the depth of the grooves 20 formed on one or both sides from the width B of the electromagnetic wave absorbing member (see Fig. 4(b))) is greater than the distance between the tips of the ribs 15.

[0045] This facilitates positioning of the electromagnetic wave absorbing member 7. Also, during and after press-fitting, tilting of the electromagnetic wave absorbing member 7 inside the protector body 3 and movement of the electromagnetic wave absorbing member 7 in the axial direction can be suppressed.

[0046] In the above-mentioned example, the ribs 15 sandwich the electromagnetic wave absorbing member 7 from the width direction (and the vertical direction), but the present invention is not limited to this. Fig. 6(a) is a plan view of the protector body 3 further provided with ribs 15 on the opposing surfaces in the axial direction, and Fig. 6(b) is a plan view showing a state in which the electromagnetic wave absorbing member 7 is housed in the protector body 3 of Fig. 6(a).

[0047] As shown in the figure, by providing ribs 15 also in the axial direction perpendicular to the width direction and the up-down direction, it is possible to sandwich the electromagnetic wave absorbing member 7 from two directions, the width direction and the axial direction (or from three directions including the up-down direction). In this case, the total length of the electromagnetic wave absorbing member 7 in the axial direction (length F in 4(a) in the figure) is greater than the distance (G in FIG. 6(a)) between the ribs 15 provided on the side wall portions of the protector main body 3 that face each other in the axial direction.

[0048] In this case as well, both end faces (both side faces opposing each other in the axial direction) of the electromagnetic wave absorbing member 7 are preferably flat, and vertical grooves may be formed in the areas corresponding to the ribs 15.

[0049] As described above, according to this embodiment, the electromagnetic wave absorbing member 7 is press-fitted into the protector body 3 and sandwiched and fixed by the ribs 15, eliminating the need for cable ties for fixing as in the past, and improving workability. In addition, since the electromagnetic wave absorbing member 7 is sandwiched by the ribs 15 at least at multiple points during press-fitting, it is possible to prevent the electromagnetic wave absorbing member 7 from swinging inside the protector body 3.

[0050] In addition, since there is no need to use an annular case, the sizes of the protector body 3 and the protector cover 5 can be set according to the size of the electromagnetic wave absorbing member 7 (ferrite core). Therefore, it is possible to prevent the protector body 3 and the protector cover 5 from becoming large.

[0051] Although the ribs 15 are formed only in the direction perpendicular to the axial direction of the electric wire 9, the direction in which the ribs 15 are formed is not limited to this. For example, ribs parallel to the axial direction may be further added to form a substantially lattice-like rib, or ribs may be formed in a honeycomb shape.

[0052] Furthermore, the shapes of the ribs formed on the protector body 3 and the protector cover 5 may be changed. For example, the inner surface of the protector body 3 is a rib 15 that is crushed by press-fitting, and it is desirable to form the rib 15 approximately parallel to the press-fitting direction of the electromagnetic wave absorbing member 7 (direction perpendicular to the longitudinal direction of the electric wire 9). On the other hand, as described above, in the case where the ribs formed on the bottom upper surface of the protector body 3 and the bottom surface of the protector cover 5 do not contribute to the press-fitting, the ribs may be formed in a honeycomb shape.

[0053] In the above-described embodiment, the electromagnetic wave absorbing member 7 has a split structure and is press-fitted into the protector body 3 as annular halves facing each other in the vertical direction, but it may be oriented perpendicular to this. For example, the split electromagnetic wave absorbing member 7 may be press-fitted facing each other in the width direction of the protector body 3. That is, the direction in which the split electromagnetic wave absorbing members 7 are pressed by the ribs 15 arranged opposite each other may be made to coincide with the direction in which the electromagnetic wave absorbing members 7 face each other. In this way, the split electromagnetic wave absorbing members 7 can be pressed against each other by the ribs 15 on both sides, so that it is possible to prevent gaps from being generated between the split electromagnetic wave absorbing members 7 inside the protector body 3.

[0054] Next, a second embodiment will be described. Fig. 7 is a partially transparent perspective view showing a protector body 3a according to the second embodiment, and Fig. 8 is a plan view of the protector body 3a. In the following description, the same reference numerals as in Figs. 1 to 6 are used for configurations that exhibit the same functions as those in the first embodiment, and duplicated descriptions will be omitted. In the following description, the protector cover 5 is not shown, but it can have the same structure as the protector body.

[0055] The protector body 3a has a structure substantially similar to that of the protector body 3, but differs in that in addition to the ribs 15, a plurality of protrusions 21 are provided in areas other than the ribs 15. The protrusions 21 protrude from the inner surface of the protector body 3. Unlike the ribs 15, the protrusions 21 may have a rounded tip.

[0056] 8, distance D between the tips of protrusions 21 is larger than distance B between the tips of ribs 15 formed on opposing inner sides. In this case, the relationship between the intervals of each part is D ≒ A > B when compared with width A of electromagnetic wave absorbing member 7 to be press-fitted (see FIG. 4).

[0057] Fig. 9(a) is a plan view showing the state in which the electromagnetic wave absorbing member 7 is housed in the protector main body 3a, and Fig. 9(b) is an enlarged view of part E in Fig. 9(a). As described above, the tip of the rib 15 is crushed and the electromagnetic wave absorbing member 7 is press-fitted. At this time, the tip of the protrusion 21 may be in slight contact with the side surface of the electromagnetic wave absorbing member 7, or there may be a slight gap.

[0058] For example, when the spacing D between the protrusions 21 (see FIG. 8) is slightly larger than the overall width A (see FIG. 4) of the electromagnetic wave absorbing member 7, a small gap is created between at least one of the protrusions 21 and the electromagnetic wave absorbing member 7. When the spacing D between the protrusions 21 is slightly smaller than the overall width A of the electromagnetic wave absorbing member 7, the tip of the protrusion 21 is also slightly crushed. In either case, the electromagnetic wave absorbing member 7 is sandwiched between the opposing protrusions 21.

[0059] This increases the contact area (contact area) between the electromagnetic wave absorbing member 7 and the protector body 3, so that the electromagnetic wave absorbing member 7 can be more reliably fixed inside the protector body 3. In this case, if an attempt is made to increase the contact area with the electromagnetic wave absorbing member 7 using only the ribs 15, for example, there is a risk that the resistance during press-fitting will be too large. However, the increase in resistance due to the protrusions 21 during insertion (press-fitting) of the electromagnetic wave absorbing member 7 is smaller than that of the ribs 15. For this reason, the force required to press-fit the electromagnetic wave absorbing member 7 remains almost unchanged, and the holding force of the electromagnetic wave absorbing member 7 can be increased.

[0060] As described above, the outer periphery of the electric wire 9 and the electromagnetic wave absorbing member 7 may be covered with the braided wire 19. In this case, if only the ribs 15 are used, the braided wire 19 may be displaced between the ribs 15. In contrast, the protrusions 21 can gently and uniformly press the entire braided wire 19 from the outer periphery, thereby preventing the braided wire 19 from being displaced. When the braided wire 19 is used, the total width A' including the braided wire 19 (total width A of the electromagnetic wave absorbing member 7 + braided wire thickness (×2)) may be approximately the same as the distance D between the protrusions 21.

[0061] As described above, the upper and lower surfaces of the electromagnetic wave absorbing member 7 do not need to be pressed by the ribs 15, but in this case, the electromagnetic wave absorbing member 7 may be sandwiched from the upper and lower surfaces by the protrusions 21 instead of the ribs 15. In addition, when the ribs 15 provided on the bottom upper surface of the protector body and the bottom surface of the protector cover are not used for press-fitting but are used only for the purpose of reinforcing each part, the ribs 15 facing the upper and lower surfaces of the electromagnetic wave absorbing member 7 may be made to have approximately the same height as the protrusions 21. In addition, the protrusions 21 may also be provided on the inner surface of the protector body 3 facing in the axial direction.

[0062] According to the second embodiment, it is possible to obtain the same effects as those of the first embodiment. Furthermore, by providing the protrusions 21, it is possible to hold the electromagnetic wave absorbing member 7 more reliably. Furthermore, even when the braided wire 19 is used, it is possible to prevent the braided wire 19 from shifting. In this case, the protrusions 21 have little effect on the force required to press-fit the electromagnetic wave absorbing member 7, so that deterioration of workability is prevented.

[0063] Next, a third embodiment will be described. Fig. 10 is a partially transparent perspective view showing a protector body 3b. The protector body 3b has substantially the same configuration as the protector body 3, but differs in that a rib 15a is formed.

[0064] Unlike the rib 15, the rib 15a does not have a tapered tip but has a flat tip. When the electromagnetic wave absorbing member 7 is housed, the rib 15a is not crushed and is in surface contact with the outer surface of the electromagnetic wave absorbing member 7. In addition, the tip of the rib 15a (contact surface with the electromagnetic wave absorbing member 7) is provided with a sliding suppression structure 23 that increases the coefficient of friction with the outer surface of the electromagnetic wave absorbing member 7.

[0065] The sliding suppression structure 23 may be, for example, a method of increasing the surface roughness of the flat portion of the rib 15a or a method of forming minute irregularities. The sliding suppression structure 23 may also be a separate member such as rubber attached to the tip of the rib 15a. Even in this case, the sliding suppression structure 23 is included in the rib 15a, and the rib 15a including the minute irregularities is in surface contact with the electromagnetic wave absorbing member 7.

[0066] In order to increase the contact area with the outer peripheral surface of the electromagnetic wave absorbing member 7, it is desirable that the shape of the ribs 15a corresponds to the outer shape of the electromagnetic wave absorbing member 7. For example, when a protector cover corresponding to the protector body 3b is placed, it is desirable that both ribs 15a are formed so that, as a whole, they match the outer shape (e.g., octagonal) of the electromagnetic wave absorbing member 7. In addition, in order to reliably bring the ribs 15a into contact with the outer peripheral surface of the electromagnetic wave absorbing member 7, it is desirable that the interval between the ribs 15a (the size of the space formed by the ribs 15a) is the same as or slightly smaller than the size of the electromagnetic wave absorbing member.

[0067] According to the third embodiment, as in the first embodiment, the electromagnetic wave absorbing member 7 is inserted into the protector body 3 and is fixed by sandwiching the electromagnetic wave absorbing member 7 with the rib 15a, which eliminates the need for a cable tie for fixing as in the past, and improves workability. In addition, since there is no need to use an annular case, the size of the protector body 3b etc. can be set according to the size of the electromagnetic wave absorbing member 7 (ferrite core). This makes it possible to prevent the protector body 3b etc. from becoming large.

[0068] Although the embodiment of the present invention has been described above with reference to the attached drawings, the technical scope of the present invention is not limited to the above-described embodiment. It is clear that a person skilled in the art can think of various modifications or alterations within the scope of the technical ideas described in the claims, and it is understood that these also naturally belong to the technical scope of the present invention.

[0069] For example, it goes without saying that the configurations in each embodiment can be combined with each other. [Explanation of symbols]

[0070] 1. Electromagnetic wave absorbing material fixing structure 3: Protector body 5………Protector cover 7. Electromagnetic wave absorbing material 9……Electric wire 11...Engagement portion 13...Engagement portion 15, 15a………Rib 17... Electric wire penetration part 19……braided wire 20……groove 21……protrusion 23...Sliding prevention structure

Claims

1. A structure for fixing an electromagnetic wave absorbing member to an electric wire, comprising: Electric wires and an electromagnetic wave absorbing member disposed on the outer periphery of the electric wire; a protector in which the electromagnetic wave absorbing member is housed; Equipped with The protector has a rib protruding from an inner surface side, The electromagnetic wave absorbing member fixing structure is characterized in that the electromagnetic wave absorbing member is sandwiched between the opposing ribs and fixed to the protector.

2. 2. The electromagnetic wave absorbing member fixing structure according to claim 1, characterized in that the ribs have tapered tips, the distance between the opposing ribs before the electromagnetic wave absorbing member is inserted is smaller than the size of the corresponding portion of the electromagnetic wave absorbing member, and the electromagnetic wave absorbing member is pressed into the protector by crushing the tips of the ribs.

3. 2. The electromagnetic wave absorbing member fixing structure according to claim 1, wherein the rib is formed on an inner surface of the protector in a direction substantially perpendicular to a longitudinal direction of the electric wire.

4. 3. The electromagnetic wave absorbing member fixing structure according to claim 2, characterized in that a groove is formed in at least a portion of an outer surface of the electromagnetic wave absorbing member in a direction perpendicular to the axial direction of the electric wire, and the rib is arranged at a position corresponding to the groove.

5. The electromagnetic wave absorbing member is covered with a braided wire, A plurality of protrusions protruding from an inner surface of the protector at a portion other than the rib are provided, 3. The electromagnetic wave absorbing member fixing structure according to claim 2, wherein the electromagnetic wave absorbing member is sandwiched between the projections facing each other.

6. The rib has a flat tip and is in surface contact with the outer surface of the electromagnetic wave absorbing member.

2. The electromagnetic wave absorbing member fixing structure according to claim 1, further comprising a sliding suppression structure at the tip of said rib for increasing a coefficient of friction with the outer surface of said electromagnetic wave absorbing member.

7. 2. The electromagnetic wave absorbing member fixing structure according to claim 1, wherein the electromagnetic wave absorbing member is in a half-split shape.

8. A protector for housing and protecting an electromagnetic wave absorbing member, The protector has ribs protruding inwardly from opposing sides, The rib has a tapered tip, and when the electromagnetic wave absorbing member is housed in the protector, the tip of the rib can be crushed to press the electromagnetic wave absorbing member into the protector.

Images