JP2006024702A - Noise absorber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a noise absorber using low flexibility resin, in which the slippage of a case is suppressed. <P>SOLUTION: A hinge part 30 is formed to have a substantially semicircular cross section and connected smoothly with a first circumferential portion and a second circumferential portion, without forming a stress concentration part at the joint. A pair of latches 13 are projecting from the second edge, i.e. the other circumferential end of the first circumferential portion, toward a direction substantially tangential to the circumferential direction of the first circumferential portion. Forward end 13A of the latch 13 is formed thicker, gradually going toward the first case member side from the forward end and when the case is closed, a claw portion engaging with a pair of latch through holes 21a formed in the vicinity of the fourth edge, i.e. the other circumferential end of the second circumferential portion, is formed. At positions adjacent to the pair of latch through holes 21a, anti-slippage pieces 23 are made to project toward the direction substantially tangential to the circumferential direction of the second circumferential portion. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a noise absorbing device, and more particularly to a noise absorbing device using a case made of a general-purpose resin.

  2. Description of the Related Art Conventionally, in a noise absorber, the outer periphery of an electric wire is covered with a magnetic core, and the noise current flowing through the electric wire is absorbed by the core. This core is fragile because it is manufactured by firing, etc., and to protect it, and for convenience when mounting the core on the electric wire, the core is mounted on the electric wire by covering the core with a resin case divided into two parts. ing.

  In some cases, the core is divided into two parts in advance in order to increase the wearability. In the case of the two divided parts, a part of the case is used as a spring, and the two parts are brought into close contact with each other. Further, by using a part of the case as a spring, it is possible to hold down the core housed in the case and prevent the core from violating.

  Since the spring characteristics of this case are required for a long time after being attached to an electric wire, etc., the resin used in the case must satisfy this requirement. For example, physical properties such as nylon satisfy this requirement. ing. When nylon is used for the case, the elasticity that presses the core is sufficient for a long period of time, but the hinge that connects each of the two divided cases follows the movement because of its low flexibility. There was a case where it was not possible to break. This has been solved by boiling the case to increase the flexibility of the material itself, but the boiling process has increased and the productivity of the case has been reduced.

In order to solve this, as shown in Patent Document 1, the hinge is convex when the case is open, and the hinge extends so that it is substantially linear with respect to the outer surface of the case when the case is closed. A case configured in (1) is disclosed.
Japanese Patent No. 2801173

  However, in the noise absorbing device disclosed in Patent Document 1, a convex portion is provided on the hinge in order to make the hinge substantially linear with the case closed. There was a risk of stress concentration on other hinge parts. In addition, the convex part of the hinge is in contact with a part of the case, so that the outer surface of the case is always kept in a straight line to prevent the case from being displaced, but in this case, the burden on the hinge is increased. When a large force is applied to the case, the hinge itself may be damaged, and it has not been possible to sufficiently prevent the case from coming off due to the displacement and displacement of the case. Moreover, since the convex part is provided on the hinge and the part corresponding to the convex part is provided on the case, the case itself inevitably has a complicated shape. Accordingly, the mold for shaping the case has a complicated shape, and the productivity of the case has been reduced.

  Therefore, an object of the present invention is to provide a noise absorbing device that uses a low-flexibility resin and suppresses occurrence of a case shift.

  In order to achieve the above object, the present invention provides a noise absorbing device including a core and a case in which the core is contained, wherein the case has a hinge and a first edge connected to one of the hinges. And a first edge that can be accommodated between the first edge and the second edge by connecting the first edge and the second edge. A first case, a third edge connected to the other of the hinges and capable of contacting the first edge, and a fourth edge serving as a free end and capable of contacting the second edge. And a second case that connects the third edge and the fourth edge to define a second recess that can accommodate the core between the third edge and the fourth edge. A cross section cut in a direction connecting the one edge and the second edge protrudes from the first recess and the second recess and is configured by a substantially curved line. In the second edge and the fourth edge, The second edge extends from the second edge or the fourth edge to the other side in a state in which the second edge and the fourth edge are in contact with each other. The first slip prevention piece that suppresses the shift in the direction toward the one edge, and the second edge or the fourth edge extends from the first edge of the second case relative to the first case. There is provided a noise absorber provided with a second slip prevention piece that suppresses a shift in a direction toward two edges.

  According to such a configuration, when the first case and the second case are accommodated and closed, the hinge bending angle can be set to about 90 °, for example. Therefore, the resin used for the case does not need a high degree of flexibility and flexibility. Moreover, it becomes possible to suppress the deviation | shift of the 2nd case with respect to a 1st case by a 1st deviation | shift prevention piece and a 2nd deviation | shift prevention piece. Therefore, it is possible to prevent the case from being detached due to the deviation. In particular, since the configuration of the hinge portion can be simplified, the shape of the mold for molding the case can be simplified, and the productivity of the case can be increased.

  Further, at least one of the first slip prevention piece or the second slip prevention piece is provided with a locking claw portion, and the slippage is prevented by the first slip prevention piece or the second slip prevention piece provided with the locking claw portion. The first case or the second case is preferably provided with a locking claw accommodating portion that engages with the locking claw portion.

  According to such a configuration, the first case and the second case can be engaged. Therefore, the case is prevented from coming off. In addition, by using at least one of the first deviation prevention piece or the second deviation prevention piece as a locking claw, it is not necessary to newly form a locking portion other than the first deviation prevention piece or the second deviation prevention piece, It is possible to reduce the number of components constituting the entire case.

  Further, it is desirable that the central portion in the cross section cut in the direction connecting the first edge portion and the second edge portion of the hinge is formed thinner than the non-center portion. According to such a configuration, the flexibility of the hinge can be increased. Therefore, a material having lower flexibility than nylon or the like, for example, PBT (polybutylene terephthalate) or the like can be used as a material for the case. Further, since the flexibility of the hinge increases due to the increased flexibility, the durability against bending of the hinge can be increased.

  According to the noise absorbing device of the first aspect of the present invention, it is possible to use the low-flexibility resin and to suppress the occurrence of the case shift.

  A noise absorber according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a state in which the noise absorbing device 1 is attached to the cable 2. As shown in FIGS. 1 and 2, the noise absorbing device 1 includes a cylindrical case 3 and a substantially cylindrical core 4 made of a magnetic body having a through hole 4 a through which the cable 2 is inserted. The case 3 is made of nylon and includes a first case member 10 in which a first recess 10a (FIG. 3) in which the core 4 can be inserted is defined, and a second recess 20a in which the core 4 can be inserted. A defined second case member 20 and a hinge portion 30 (FIG. 3) for connecting the first case member 10 and the second case member 20 are provided. The case 3 can be opened and closed in the closed state shown in FIG. 1 (the connected state of the first case member 10 and the second case member 20) or the open state shown in FIG.

  Next, the detailed structure of the case 3 will be described with reference to FIGS. FIG. 3 is a diagram showing the open state of the case 3 with the core 4 removed from the noise absorbing device 1. As shown in FIGS. 2 and 3, the first case member 10 has a shape obtained by halving the case 3 along its axial direction, and a first circumferential portion having a substantially semicircular cross section perpendicular to the axial direction. 11 and a pair of first end portions 12 located at both ends thereof. The second case member 20 has substantially the same shape as the first case member 10, and includes a second circumferential portion 21 and a pair of second end portions 22 located at both ends thereof. And with the pair of hinge portions 30, the first edge portion 11A that is one end in the circumferential direction of the first circumferential portion 11 and the third edge portion 21A that is one end in the circumferential direction of the second circumferential portion 21 are It is connected.

  As shown in FIG. 2, the second edge 11 </ b> B, which is the other end in the circumferential direction of the first circumferential portion 11, prevents the first deviation toward the substantially tangential direction in the circumferential direction of the first circumferential portion 11. A pair of locking portions 13 that are pieces project from each other. Further, the distal end portion 13A of the latching portion 13 is gradually thickened from the distal end toward the first case member 10 side, and is a latching claw portion that latches in a later-described latching portion insertion hole 21a. Is forming. In the vicinity of the fourth edge 21B, which is the other circumferential end of the second circumferential portion 21, a pair of engagements for engaging the pair of engagement portions 13 when the case 3 is closed. A stop fitting hole 21 a is formed through the second circumferential portion 21. In addition, at positions adjacent to the pair of locking portion insertion holes 21a, the displacement prevention pieces 23, which are second displacement prevention pieces, respectively extend in a substantially tangential direction in the circumferential direction of the second circumferential portion 21. Projected to

  Also, the pair of first end portions 12 of the first case member 10 are each formed with a substantially semicircular first notch 12a, and the pair of second end portions 22 of the second case member 20 are also formed. A second notch 22a similar to the first notch 12a is formed. When the noise absorbing device 1 is attached to the cable 2, a pair of substantially circular cable holes 3a (FIG. 1) as shown in FIG. 1 are provided by the first notch 12a and the second notch 22a. The A pair of first end portions 12 of the first case member 10 and on both sides of the first notch 12a, a first end portion facing a pair of core holding members 12A for holding the core 4 in a predetermined position. 12 is projected.

  As shown in FIG. 3, the first circumferential portion 11 and the second circumferential portion 21 have a first flat portion 14 and a second flat portion 24 that extend in the axial direction of the case 3 at substantially the center in the circumferential direction, respectively. ing. The first flat portion 14 and the second flat portion 24 face each other when the case 3 is closed. The first flat portion 14 is provided with a pair of first holding spring portions 15 and a pair of first cable holding portions 16. The pair of first restraining spring portions 15 are cut out in a U-shape and connected to the first flat portion 14 on one side. Further, the pair of first holding spring portions 15 are provided so as to incline toward the inside of the case 3 as shown in FIG. 4 which is a cross-sectional view taken along line IV-IV in FIG. A first pressing action portion 15A for pressing the core 4 is defined at the tip.

  As shown in FIGS. 3 to 5, the first cable holding portion 16 is provided in the vicinity of both axial ends of the case 3 of the first flat portion 14. The first cable holding portion 16 is composed of a pair of first cable holding pieces 16A and 16B arranged adjacent to each other so as to be plane-symmetric with respect to a plane along the IV-IV line. The cable holding pieces 16A and 16B include first arm portions 16A1 and 16B1 and second arm portions 16A2 and 16B2 made of resin. Hereinafter, the first cable holding piece 16A will be described as an example unless otherwise specified.

  The second flat portion 24 is also provided with a pair of second holding spring portions 25 and a pair of second cable holding portions 26, similarly to the first flat portion 14. The second cable holding unit 26 has the same configuration as the first cable holding unit 16.

  FIG. 5 is a detailed perspective view of the cable holding portion 16. The first arm portion 16A1 is formed in a shape obtained by cutting a U-shape from the first flat portion 14. The first arm portion 16A1 has a first series contact end 161A connected to the first flat portion 14 and a first free end 162A. The first arm portion 16A1 extends along the axial direction of the case 3, and the first flat portion 14 and the first arm portion 16A1 are inclined toward the inside of the case 3 so as to form an angle α. Is provided.

  The second arm portion 16A2 includes a second connecting end 163A connected to the first free end 162A and a second free end 164A, and extends in a substantially vertical direction with respect to the first flat portion 14. The second arm portions 16A2 and 16B2 have sides 165A and 165B, respectively, and the sides 165A and 165B face each other. The cable 2 is sandwiched between the side 165A and the side 165B by the cable holding portion 16 having such a configuration while being in contact with each other.

  At this time, as the cable 2, a cable having an outer diameter larger than the distance between the first arm portion 16 </ b> A <b> 1 and the first arm portion 16 </ b> B <b> 1 is used to be sandwiched while being in contact with the sides 165 </ b> A and 165 </ b> B. According to such a configuration, since the first cable holding pieces 16A and 16B are made of resin, they are elastically movable vertically and horizontally. Therefore, when the cable 2 is arranged between the side 165A and the side 165B, the side 165A and the side 165B are opened according to the diameter of the cable 2, so that the positions of the cables 2 having different diameters can be fixed.

  FIG. 6 is a cross-sectional view of the opposing second arm portion 16A2 along the line VI-VI in FIG. The second arm portions 16A2 and 16B2 are formed such that the distance between the side 165A and the side 165B gradually increases from the second connecting end 163A and B toward the second free end 164A and B. With such a configuration, the cable 2 can easily enter the gap 166. Further, the second free ends 164A, B of the sides 165A, B are R-shaped. According to such a configuration, since the second free ends 164A and B of the sides 165A and B are not sharp, there is no fear of damaging the cable 2.

  Further, as described above, the first arm portion 16A1 extends along the axial direction of the case 3, and the first flat portion 14 and the first arm portion 16A1 are formed inward of the case 3 so as to form an angle α. It is provided to incline toward. Therefore, when the first cable holding piece 16 </ b> A holds the cable 2, the cable holding portion 16 does not easily protrude outward from the outer surface of the first circumferential portion 11. With such a configuration, the external appearance can be prevented without impairing the beauty.

  As shown in FIGS. 6 and 7, the hinge portion 30 has a substantially semicircular cross section perpendicular to the axial direction of the case 3. The hinge portion 30 and the first circumferential portion 11 are smoothly connected without forming a stress concentration portion at the connection portion. Since the hinge portion 30 and the second circumferential portion 21 are similarly connected, as shown in FIG. 8, when the first case member 10 and the second case member 20 are in the closed state, the hinge portion 30 is The cross section extends from the connection portion of the first circumferential portion 11 to the connection portion of the second circumferential portion 21 so that the cross section is substantially linear. However, since the cross section of the hinge portion 30 is formed with a smooth curve from the connection portion with the first circumferential portion 11 to the connection portion with the second circumferential portion 21, the stress concentration portion is not formed. It is extended uniformly as a whole.

  Next, the structure of the core 4 will be described. As shown in FIG. 2, the first flat surface portion 4 </ b> A and the second flat surface portion 4 </ b> B (FIG. 9) facing each other face the second flat portion 24 and the first flat portion 14 on the outer peripheral surface of the core 4, respectively. Is formed. As shown in FIG. 9 when the core 4 is viewed from the axial direction, the first groove 4b on which the pair of core holding members 12A can be hooked is formed in the diameter direction of the core 4 and through holes at both ends of the core 4 in the axial direction. Each is formed at a position crossing 4a. Furthermore, second grooves 4 c are formed in the axially opposite end surfaces of the core 4 at positions facing the pair of first cable holding portions 16 and second cable holding portions 26, respectively. The width | variety of the 2nd groove | channel 4c is formed more widely than the width | variety which the 1st cable holding part 16 and the 2nd cable holding part 26 have, and as shown in FIG. It is formed so that a part of it can be accommodated.

  Next, a method for attaching the noise absorbing device 1 to the cable 2 will be described. First, the core holding member 12 </ b> A of the first case member 10 is hooked in the first groove 4 b of the core 4. Next, the cable 2 is inserted into the through hole 4 a of the core 4, and the locking portion 13 of the first case member 10 is inserted into the locking portion insertion hole 21 a of the second case member 20. 1 is attached to the cable 2. Accordingly, the core holding member 12A can be hooked in the first groove 4b of the core 4, and the first case member 10 and the core 4 are integrated, so that the noise absorbing device 1 can be easily attached to the cable 2. be able to. Moreover, since the cable 2 is clamped from four directions by the pair of first cable holding portions 16 and the pair of second cable holding portions 26, it is possible to prevent the noise absorbing device 1 from being displaced from a desired position of the cable 2. it can. Further, the first pressing action part 15A of the pair of first holding spring parts 15 and the second pressing action part 25A of the pair of second holding spring parts 25 are respectively provided with the first plane part 4A and the second plane part 4B facing each other. Since it presses, shakiness of the core 4 in the case 3 can be prevented.

  Moreover, since the core 4 is an integral core and does not have a joint surface unlike the split core, the noise absorption characteristics of the noise absorbing device 1 can be improved. Furthermore, the core 4 can be protected by housing the core 4 in the case 3. Moreover, since the 2nd groove | channel 4c can accommodate a part of 1st cable holding part 16 and the 2nd cable holding part 26, the length of the axial direction of case 3 can be reduced, and the noise absorption apparatus 1 Can be miniaturized.

  As shown in FIG. 1, the pair of shift prevention pieces 23 abut against the inner surface of the first case member 10 when the case 3 is in the closed state. Shifting in the direction from the one edge portion 11A toward the second edge portion 11B is suppressed. Moreover, a pair of latching | locking part 13 is inserted so that it may penetrate in the latching | locking part fitting hole 21a from the inner peripheral surface of the 2nd case member 20 to an outer peripheral surface, and 13 A of front-end | tip parts are inserted in the latching part fitting hole 21a. Locked. Therefore, the second case member 20 is prevented from shifting in the direction from the second edge portion 11B toward the first edge portion 11A with respect to the first case member 10. Accordingly, since there is no deviation between the first case member 10 and the second case member 20, the first case member 10 and the second case member due to the locking of the locking portion 13 to the locking portion insertion hole 21a. It is possible to prevent the connection with 20 from being released.

  The noise absorber 1 according to the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims. For example, the integrated core 4 is cut in two along the axial direction of the core 4 along line AA in FIG. 9 using a diamond cutter or a dicer, and as shown in FIG. 104B may be used. In this way, the core 4 can be selectively used as the integral core or the split cores 104A and 104B, and the case 3 can be used as both the integral core and the split core. Furthermore, since the core 4 is cut by a diamond cutter or a dicer, the cut surface is formed flat. Therefore, it is possible to omit the polishing step required when manufacturing the two cores constituting the split core. In addition, an integral core and a split core can be manufactured with one mold.

  Further, as shown in FIG. 11, a core holding member 22 </ b> A similar to the core holding member 12 </ b> A provided at the pair of first end portions 12 may be provided at the same place in each of the pair of second end portions 22. According to such a configuration, the two cores 104A and 104B constituting the above-described split core can be hooked on the first case member 10 and the second case member 20, respectively, so that the noise absorber 1 can be attached to the cable. It can be done easily. Further, the case 3 has a configuration in which the first case member 10 and the second case member 20 are connected by the hinge portion 30 at the first edge portion 11A and the third edge portion 21A. The structure which connects the 2nd end part 22 by a hinge part may be sufficient. In addition, the case 3 may have a shape in which the cable 2 once passed through the through hole 4a in the inside thereof can be folded back and penetrated into the through hole again.

  As shown in FIG. 12, the second free ends 264A and 264B of the sides 265A and 265B may have a C-plane shape, and the sides 365A and 365B are formed substantially in parallel as shown in FIG. May be. Moreover, the cable holding | maintenance part 16 may be provided in the both ends of only one case, and may be provided only in the one end.

  As shown in FIG. 14, various modifications are assumed for the hinge portion. 14A to 14C, the cross-sectional shape orthogonal to the axial direction of the hinge portions 130 to 132 is such that the substantially central portion is thinner than the non-central portion. good. By adopting these shapes, the flexibility of the substantially central portion is increased, and even if a material that is less flexible than nylon, such as PBT, is used, it is possible to manufacture a case without reducing the flexibility of the hinge. Become. Further, like the hinge portions 133 to 136 shown in FIGS. 14D to 14G, the cross-sectional shape may be configured by a combination of a circle and an ellipse, or a combination of a circle and a straight line.

  Next, another embodiment for locking the first case member 10 and the second case member 20 will be described. As shown in FIG. 15, a pair of convex portions 111 </ b> A project from the outer peripheral surface near the second edge portion 11 </ b> B of the first case member 10. Further, a pair of locking portions 113 project from the fourth edge portion 21 </ b> B of the second case member 21 so as to extend in a substantially tangential direction in the circumferential direction of the second circumferential portion 21. The locking portion 113 is formed with a locking hole 113a. Further, a slip prevention piece 123 is provided so as to extend from a substantially middle point between the pair of locking portions 113 so as to extend in a substantially tangential direction in the circumferential direction of the second circumferential portion 21. When the case 3 is in a closed state, the locking portion 113 is locked to the locking hole 113a by fitting the convex portion 111A into the locking hole 113a. Further, as shown in FIG. 16, the shift prevention piece 123 is positioned so as to contact the inner surface of the first circumferential portion 11 in the vicinity of the second edge portion 11 </ b> B. Therefore, the second case member 20 is restrained from shifting in the direction from the second edge portion 11B toward the first edge portion 11A with respect to the first case member 10. Moreover, since the slip prevention piece 123 is in contact with the inner surface of the first case member 10, the second case member 20 is displaced with respect to the first case member 10 in the direction from the first edge portion 11A toward the second edge portion 11B. Is suppressed. Accordingly, since there is no deviation between the first case member 10 and the second case member 20, the first case member 10 and the second case member 20 are joined by the locking of the locking portion 113 to the convex portion 111A. Can be prevented from being released.

The perspective view which showed the state which attached the noise absorber by embodiment of this invention to the cable. The perspective view which showed the state which opened the case of the noise absorber by embodiment of this invention. The figure which showed the open state of the case by embodiment of this invention. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. The detailed perspective view of the cable holding part 16 periphery by this Embodiment. Sectional drawing along the VI-VI line of FIG. The detailed sectional view of the hinge part periphery by an embodiment of the invention. The detailed sectional view of the closed state around the hinge part by an embodiment of the invention. The figure which looked at the core by embodiment of this invention from the axial direction. The top view which showed the state which opened the case of the noise absorber by embodiment of this invention. The figure which divided | segmented the integral core by this Embodiment, and attached the divided | segmented core to the 1st case member and the 2nd case member, respectively. The figure of the example of a change of the cable holding part by this Embodiment. The figure of the other example of a change of the cable holding part by this Embodiment. (A)-(g) is sectional drawing showing the example of a change of the hinge part by embodiment of this invention. The fragmentary perspective view showing the example of a change of the latching | locking part by embodiment of this invention. The fragmentary sectional view showing the example of a change of the latching | locking part by embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Noise absorber 2 Cable 3 Case 3a Cable hole 4 Core 4A Plane part 4B Plane part 4a Through-hole 4b First groove 4c Second groove 10 First case member 10a First recessed part 11 First circumferential part 11A First edge Part 11B Second edge part 12 End part 12A Core holding member 13 Locking part 13A Tip part 14 Flat part 15 Spring part 15A Pressing action part 16 Cable holding part 16A Cable holding piece 16A1 Arm part 16A2 Arm part 20 Second case member 20a Second recessed portion 21 Second circumferential portion 21a Locking portion insertion hole 21A Third edge portion 21B Fourth edge portion 22 End portion 23 Prevention piece 24 Flat portion 25 Spring portion 25A Pressing action portion 26 Cable holding portion 26A1 Arm portion 26A2 Arm portion 30 Hinge portion 161 First free end 162 Second free end 163 First series contact end 164 Second free end 165 side 166 gap

Claims (3)

The core,
A case in which the core is contained, and a noise absorbing device comprising:
The case includes a hinge,
A first edge connected to one of the hinges and a second edge serving as a free end, the first edge and the second edge being connected to each other by connecting the first edge and the second edge; A first case defining a first recess capable of accommodating the core between the edge portion;
A third edge coupled to the other of the hinges and capable of contacting the first edge; and a fourth edge serving as a free end and capable of contacting the second edge. A second case connecting the three edges and the fourth edge to define a second recess capable of accommodating the core between the third edge and the fourth edge;
The hinge has a cross section cut in a direction connecting the first edge and the second edge, and the hinge protrudes from the first recess and the second recess, and is configured by a substantially curved line.
From the second edge or the fourth edge to the other side, the second edge and the fourth edge are in contact with the second edge and the fourth edge. A first shift prevention piece that extends and suppresses a shift of the second case relative to the first case in a direction from the second edge toward the first edge; and a second edge or the fourth edge A second slip prevention piece that extends from any one of the portions and suppresses a shift of the second case with respect to the first case in a direction from the first edge toward the second edge. A noise absorber.   At least one of the first deviation prevention piece or the second deviation prevention piece is provided with a locking claw portion, and the first deviation prevention piece or the second deviation prevention piece provided with the locking claw portion The noise absorbing device according to claim 1, wherein the first case or the second case that is prevented from slipping is provided with a locking claw accommodating portion that engages with the locking claw portion.   2. A central portion in a cross section cut in a direction connecting the first edge portion and the second edge portion of the hinge is formed thinner than a non-central portion. Or the noise absorber in any one of Claim 2.

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