JP2010153731A - Noise absorber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a noise absorber which is durable to vibration and a thermal shock, and is simple in structure. <P>SOLUTION: An external periphery copying section 81 of a fixing member 8 covers a case 2 along the circumferential direction to hold it. A first plate 82 is almost parallel to the surface of a mounting substrate when a noise absorber 1 is mounted to the mounting substrate. A second plate 83 is almost parallel to the first plate 82. A first via hole 82a is formed at the first plate 82. A second via hole 83a which has a relationship almost coaxial with the first via hole 82a and a diameter smaller than that of the first via hole 82a is formed at a second plate 83. A locking part 84 almost in a U shape is formed at the other end 82B of the first plate 82. A pair of axially projecting sections 85, 86 are formed on the first plate 82. A one-end convex part 87 and the other end convex part 88 are formed at projecting ends of the axially projecting sections, respectively. The one-end convex part and the other end convex part are formed almost in a rectangular shape and project into the radially inward direction of the case 2 in the side view of the noise absorber 1, respectively. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a noise absorber, and more particularly to a noise absorber attached to a power cable.

  Conventionally, in an electronic device, in order to remove noise generated from a power source, a noise absorbing device having a ferrite core is attached to a power cable. Specifically, a power cable is inserted into the through hole of the ferrite core in which the through hole is formed so that the ferrite core does not move relative to the power cable, and a case such as a resin is used to prevent the core from being damaged. Covers the ferrite core. The noise absorbing device is generally used by being fixed on a mounting substrate by a resin fixing member.

More specifically, the fixing base made of resin, which is a fixing member provided separately from the noise absorbing device and the mounting substrate, is locked to the noise absorbing device, and the fixing base is fixed to the mounting substrate. The noise absorbing device is fixed to the mounting board. A noise absorber fixed on the mounting substrate in this way is described in, for example, Japanese Patent No. 3075555 (Patent Document 1).
Japanese Patent No. 3075555

  However, in the conventional noise absorbing device described above, since the fixing member is made of resin, it is vulnerable to vibration and thermal shock, and for example, it has been difficult to use for a vehicle. Moreover, since the structure which locks the fixing base which is a fixing member to a noise absorption apparatus was taken, the structure for locking a fixing base to a noise absorption apparatus was complicated.

  Accordingly, an object of the present invention is to provide a noise absorbing device that is resistant to vibration and thermal shock and has a simple structure.

  In order to solve the above problems, the present invention provides a core in which a cable insertion passage through which a cable can be inserted is formed, a case containing the core, and a fixing member for fixing the case to a mounting substrate or the like. The fixing member is made of metal, and includes an outer periphery copying portion provided so as to wrap and hold the case along the peripheral surface of the case, and an outer periphery copying portion in the circumferential direction of the case. A first flat plate portion formed with a first through hole connected to one end and capable of facing substantially parallel to the surface of the mounting substrate and having a through direction oriented in a direction perpendicular to the surface of the mounting substrate; A second through-hole connected to the other end of the outer periphery copying portion in the circumferential direction of the case and disposed opposite to and substantially parallel to the first flat plate portion and having a substantially coaxial positional relationship with the first through-hole A noise absorbing device having a formed second flat plate portion is provided. That.

  Since the fixing member is made of metal, the fixing member can be made resistant to vibration and thermal shock, and the noise absorbing device can be used for in-vehicle use.

  Also, an outer periphery copying portion provided so as to wrap and hold the case along the peripheral surface of the case is opposed to one end of the outer periphery copying portion in the circumferential direction of the case, and is substantially parallel to the surface of the mounting substrate. The first flat plate portion is connected to the other end of the outer peripheral copying portion in the circumferential direction of the case, and the first flat plate portion in which the first through hole is formed in the direction perpendicular to the surface of the mounting substrate. The first through hole and the second through hole have a second flat plate portion formed with a second through hole that is disposed substantially in parallel with the first portion and has a substantially coaxial positional relationship with the first through hole. The noise absorbing device can be easily fixed to the mounting board by passing the screw through and screwing the screw into a screw hole previously formed in the mounting board. Therefore, a noise absorbing device having a fixing member with a relatively simple structure can be obtained, and the configuration of the entire noise absorbing device can be simplified.

  Furthermore, the first through hole and the second through hole are designed by forming a gap between the first flat plate portion and the second flat plate portion when the inner surface of the outer peripheral copying portion is in close contact with the peripheral surface of the case. 2 When the screw is passed through the through hole and further screwed into the screw hole formed in advance on the mounting substrate, the first gap is eliminated so that the gap between the first flat plate portion and the second flat plate portion is eliminated. By pulling the flat plate portion and the second flat plate portion toward each other, the outer periphery copying portion can be in a state of holding the case by tightening the case.

  Here, the other end of the first flat plate portion connected to one end of the outer periphery copying portion in the circumferential direction of the case is connected to the other end of the outer periphery copying portion in the circumferential direction of the case. Preferably, the second flat plate portion has a locking portion that can temporarily lock the other end portion with respect to the one end portion.

  One end portion of the second flat plate portion connected to the other end of the outer peripheral copy portion in the circumferential direction of the case is provided at the other end portion of the first flat plate portion connected to one end of the outer peripheral copy portion in the circumferential direction of the case. Since the other end portion of the second flat plate portion is locked to the other end portion of the first flat plate portion, the case is fixed by the fixing member. The case can be held by the fixing member to such an extent that the case does not fall off from the fixing member without applying an external force to the fixing member to hold it.

  In addition, one end of the fixing member in the axial direction of the case is provided with an end protrusion that protrudes inward in the radial direction of the case and can abut against one end of the case in the axial direction. The other end of the fixing member in the axial direction is preferably provided with a convex portion at the other end that protrudes inward in the radial direction of the case and can abut against the other end of the case in the axial direction.

  One end of the fixing member in the axial direction of the case is provided with one end protrusion that protrudes inward in the radial direction of the case and can abut on one end of the case in the axial direction. The end is provided with a convex portion at the other end protruding inward in the radial direction of the case and capable of contacting the other axial end of the case. And the other end in the axial direction of the case abuts against the convex portion at the other end, so that the case can be positioned at a predetermined position of the outer periphery copying portion in the axial direction of the case. Therefore, it is possible to prevent the case from being fixed to the outer periphery copying portion at a position shifted from the predetermined position.

  Further, the core has a halved shape composed of a pair of core parts that can be divided into two on a plane including the axis of the case, and the pair of core parts form an annular shape by contacting and combining with each other. The surface defines the cable insertion path, and the case preferably includes a pair of case portions that can be divided into two by a plane including the axis of the case, and each case portion preferably accommodates the core portion.

  The core has a halved shape consisting of a pair of core parts that can be divided into two planes including the axis of the case, and the pair of core parts form a ring by being combined with each other so that the inner peripheral surface is a cable insertion path The case is composed of a pair of case parts that can be divided into two on a plane including the axis of the case, and each case part accommodates the core part, and the pair of case parts engage with each other. Even when the part locking part is provided in the pair of case parts and the case part locking part is damaged, the case is wrapped and held by the fixing member, so the pair of cases It can prevent that the core part which the part remove | deviated from each other and was accommodated in comes out.

  Moreover, it is preferable that the outer shape of the case cut by a plane perpendicular to the axial direction of the case is circular. Since the outer shape of the case cut by a plane perpendicular to the axial direction of the case is circular, it can be configured to be resistant to vibration and thermal shock.

  In addition, it is preferable that the first through hole and the cross section of the second through hole cut by a plane perpendicular to the penetrating direction have a circular shape, and the diameter of the first through hole is larger than the diameter of the second through hole. .

  Since the first through-hole and the second through-hole cut in a plane perpendicular to the penetrating direction are circular, the diameter of the first through-hole is larger than the diameter of the second through-hole. Even when the position and the axial center position of the second through hole are slightly deviated, the entire second through hole overlaps with a part of the first through hole when viewed from the axial direction of the second through hole. The screw can be easily inserted into the first through hole and the second through hole.

  As described above, the present invention can provide a noise absorber that is strong against vibration and thermal shock and has a simple structure.

  A noise absorber according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the noise absorbing device 1 includes a case 2, a core 5, and a fixing member 8. The case 2 has a substantially cylindrical shape made of a resin having elasticity, and a pair of the first case portion 3 and the second case portion 2 can be divided in half (divided into two) by a plane including the axis of the case 2. It is comprised from the case part 4. FIG. As shown in FIG. 4, a hinge 2A and a hinge 2B are provided between the first case portion 3 and the second case portion 4, and the first case portion 3 and the second case portion 2B are provided by the hinge 2A and the hinge 2B. The case portion 4 is integrated.

  The first case portion 3 closes the first peripheral wall portion 3A, the first end wall portion 3B that closes one axial end of the first peripheral wall portion 3A, and the other axial end of the first peripheral wall portion 3A. It is comprised from the 2nd end wall part 3C. Hereinafter, the direction (cable insertion direction) from one end to the other end of the first peripheral wall 3A, that is, the direction from the first end wall 3B to the second end wall 3C is defined as the x-axis direction. As shown in FIG. 5, the first peripheral wall portion 3 </ b> A has a first wall portion 31 having a first mating surface 31 </ b> A that extends substantially parallel to the x-axis direction as an end surface, and extends substantially parallel to the first matching surface 31 </ b> A. A second wall portion 32 having the second mating surface 32A as an end surface, and a first bottom wall portion 33 connecting the first wall portion 31 and the second wall portion 32 are provided. The first mating surface 31A and the second mating surface 32A are arranged on the same plane. The second wall portion 32 is integrally connected to one side portion of the hinge 2A and the hinge 2B at the position of the second mating surface 32A, and the second case portion 4 is connected to the other side portion of the hinge 2A and the hinge 2B. Connected together. The direction from the second case portion 4 toward the first case portion 3 and orthogonal to the x-axis direction is defined as the y-axis direction. A direction orthogonal to the x-axis direction and the y-axis direction is defined as a z-axis direction.

  The first end wall portion 3B and the second end wall portion 3C have a shape that is obtained by cutting a disc into approximately half. The first end wall portion 3B and the second end wall portion 3C are substantially center portions in the y-axis direction. Are formed with a semicircular arc-shaped first cable insertion groove 3b and a second cable insertion groove 3c, respectively.

  Further, the first peripheral wall portion 3A has a first end wall portion 3B and a second end portion by the first wall portion 31, the first bottom wall portion 33, and the second wall portion 32 in the yz cross section shown in FIG. It has an arc shape along the circumference of the wall 3C. As shown in FIGS. 4 and 5, the first wall portion 31 is formed with spaces 31b and 31c cut out in a square shape along the x-axis direction. First support pieces 31B and 31C are provided with the bottom wall 33 side as a base and the first mating surface 31A side as a free end. The free end portions of the first support pieces 31B and 31C extend to positions close to the first mating surface 31A. As shown in FIG. 6, first contact surfaces 31 </ b> D and 31 </ b> E are defined on a surface continuous with the inner surface of the first peripheral wall portion 3 </ b> A of the first support pieces 31 </ b> B and 31 </ b> C. Moreover, these 1st support pieces 31B and 31C are bent so that the free end side may be located inside 3 A of 1st surrounding wall parts.

  As shown in FIG. 5, similarly, spaces 32b and 32c are formed in the second wall portion 32 so as to be squarely cut in line in the x-axis direction. Second support pieces 32B and 32C having the bottom wall 33 side as a base and the second mating surface 32A side as a free end are provided. The free end portions of the second support pieces 32B and 32C extend to positions close to the second mating surface 32A, respectively. As shown in FIG. 6, second contact surfaces 32 </ b> D and 32 </ b> E are defined on a surface continuous with the inner surface of the first peripheral wall portion 3 </ b> A of the second support pieces 32 </ b> B and 32 </ b> C. The second support pieces 32B and 32C are bent so that the free end side is located inside the first peripheral wall portion 3A.

  As shown in FIG. 5, first core pressing pieces 33 </ b> A and 33 </ b> B are provided in the central portion of the first bottom wall portion 33 side by side in the x-axis direction. The first core pressing pieces 33 </ b> A and 33 </ b> B are each constituted by a section in which a part of the first bottom wall portion 33 is cut into a substantially U shape, and the section is connected to the first bottom wall portion 33. It is configured in such a shape that the portion is bent inward of the first peripheral wall portion 3A with a base end.

  In addition, a first cable holding portion 34 and a second cable holding portion 35 are provided at both end positions of the first core pressing pieces 33A and 33B in the x-axis direction, which are portions of the first peripheral wall portion 3A. Yes.

  The first cable holding part 34 includes a first holding part first arm part 34A and a first holding part second extending from the first bottom wall part 33 in the vicinity of the first end wall part 3B substantially parallel to the z-axis direction. It is comprised by the arm part 34B, and can hold | maintain the cable which is not shown in figure between the 1st holding | maintenance part 1st arm part 34A and the 1st holding | maintenance part 2nd arm part 34B. Note that the first holding portion first arm portion 34A and the first holding portion second arm portion 34B have a plane-symmetric configuration with respect to the zx plane passing through the intermediate position between them.

  Similar to the first cable holding portion 34, the second cable holding portion 35 is a second holding portion extending from the first bottom wall portion 33 in the vicinity of the second end wall portion 3 </ b> C substantially parallel to the z-axis direction. It is comprised by one arm part 35A and the 2nd holding | maintenance part 2nd arm part 35B.

  First core holding members 36A, 36B are parallel to the x-axis in the first case portion 3 at a position near the first mating surface 31A and a position near the second mating surface 32A, which are part of the first end wall portion 3B. It is provided extending inward. Similarly to the first end wall portion 3B, the first core holding members 37A and 37B are part of the second end wall portion 3C and are also located near the first mating surface 31A and near the second mating surface 32A. The first case portion 3 extends inwardly in parallel with the shaft.

  At the position of the first mating surface 31A of the first wall portion 31, there are provided a first latching piece portion 39A and a second latching piece portion 39B extending in the z-axis direction. A first latching through hole 39a and a second latching through hole 39b are formed in the portion 39A and the second latching piece portion 39B, respectively. A convex portion 39C that protrudes from the first mating surface 31A is provided at a substantially intermediate portion between the first latching piece portion 39A and the second latching piece portion 39B.

  The second case portion 4 includes a second peripheral wall portion 4A, a third end wall portion 4B that closes one end of the second peripheral wall portion 4A, and a fourth end wall portion 4C that closes the other end of the second peripheral wall portion 4A. The first case portion 3 has substantially the same configuration with respect to the zx plane passing through the approximate center of the hinges 2A and 2B in the y-axis direction. Accordingly, among the components and shapes of the second case portion 4, components and shapes that have the same configuration as the components provided in the first case portion 3, specifically, the third wall portion 41 and the fourth wall. Portion 42, second bottom wall 43, third cable insertion groove 4b, fourth cable insertion groove 4c, spaces 41b and 41c, third support pieces 41B and 41C, third contact surfaces 41D and 41E, spaces 42b and 42c, Fourth support pieces 42B and 42C, fourth contact surfaces 42D and 42E, second core pressing pieces 43A and 43B, third cable holding portion 44, fourth cable holding portion 45, second core holding members 46A and 46B, and The two-core holding members 47A and 47B are the same as the component parts and the shape of the first case portion 3 corresponding to these, and the description thereof is omitted.

  As shown in FIG. 4, at the position of the third mating surface 41 </ b> A of the third wall portion 42, the first latching claw portion 49 </ b> A that can be latched by the first latching through hole 39 a and the second latching through hole 39 b. The second latching claw portion 49B is provided. Further, a concave portion 49c (FIG. 5) into which the convex portion 39C can be inserted is formed in the third mating surface 41A at a substantially intermediate point between the first latching claw portion 49A and the second latching claw portion 49B. . The first case portion 3 configured as described above accommodates a first core 6 described later, and the second case portion 4 is configured to accommodate a second core 7 described later. The outer shape of the case 2 cut by a plane perpendicular to the axial direction is circular.

  As shown in FIG. 4, the core 5 includes a first core 6 and a first core 6 each having a shape obtained by dividing a substantially cylindrical ferrite base material in a diametrical direction by a plane including the axis of the case 2. It consists of two cores 7.

  The first core 6 includes a first core first surface 6A and a first core second surface 6B, which are half-cut sections, and includes a first core first surface 6A and a first core second surface 6B. A first core groove 6a, which is a half portion of a through hole serving as a passage (cable insertion passage) through which a cable (not shown) passes, is formed therebetween. A cable insertion passage (not shown) is formed by combining the first core groove 6a and a second core groove 7a described later. The first notch 61a and the second notch that can be engaged with the first core holding members 36A and 36B, respectively, at one end side of the through holes of the first core first surface 6A and the first core second surface 6B. 61b is formed, and a third cutout 61c and a fourth cutout 61d that can be engaged with the first core holding members 37A and 37C are formed on the other end side in the through hole direction, respectively. Further, at the bottom of the first core groove 6a of the first core 6 and at the one end side position and the other end side position of the through hole, A first concave portion 6b and a second concave portion 6c are formed as spaces into which the one cable holding portion 34 and the second cable holding portion 35 are inserted.

  The 2nd core 7 is comprised in the same shape as the 1st core 6, The 2nd core 1st surface 7A and the 2nd core 2nd surface 7B are provided, and the 2nd core groove | channel 7a is formed. The first notch 71a and the second notch 71b that can be engaged with the second core holding members 46A and 46B are provided at one end side in the through direction of the through holes of the second core first surface 7A and the second core second surface 7B. Are formed on the other end side of the through-holes of the second core first surface 7A and the second core second surface 7B, respectively, and can be engaged with the second core holding members 47A and 47B. A notch 71c and a fourth notch 71d are formed. A third concave portion 7b and a fourth concave portion 7c are formed at the one end side position and the other end side position at the bottom of the second core groove 7a.

  When the first core 6 and the second core 7 are attached to the case 2, the first core 6 is inserted into the first case part 3 as shown in FIG. 7, and the first cable holding part 34, the second cable The holding portion 35 enters the first recess 6b and the second recess 6c, respectively, and the first core holding members 36A and 36B and the second core holding members 37A and 37B are respectively provided with a first notch 61a and a second notch 61b. The third notch 61c and the fourth notch 61d are hooked. Moreover, as FIG. 8 shows, the 1st core 1st surface 6A and the 1st core 2nd surface 6B of the 1st core 6 become the position which protruded from 31A of 1st mating surfaces and the 32nd mating surface 32A.

  At this time, as shown in FIG. 8, the first core 6 is urged in the z-axis direction by the first core pressing pieces 33A and 33B. Therefore, the first core 6 is at least in the z-axis direction by the first core pressing pieces 33A and 33B, the first core holding members 36A and 36B, and the second core holding members 37A and 37B (FIG. 5). It is held so as not to be detached from the part 3.

  Further, as shown in FIG. 8, the first core 6 is biased by the first support pieces 31B and 31C and the second support pieces 32B and 32C. Since the first support pieces 31B and 31C and the second support pieces 32B and 32C have their free end positions in the vicinity of the first mating surface 31A and the second mating surface 32A, their urging directions are at least second each. It is the wall 32 side, at least the first wall 31 side. Therefore, the first core 6 is elastically held in the y-axis direction. Further, when the first core 6 is held by the first support pieces 31B, 31C and the second support pieces 32B, 32C in the state shown in FIG. 9, the first contact surfaces 31D, 31E and the second contact surfaces 32D, Since 32E is held in surface contact with the first core 6, the first core 6 is stably held by each support piece. Similarly to the first core 6, the second core 7 is also held in the second case portion 4.

  As shown in FIG. 9, the cable 9 is arranged in the first core groove 6a (FIG. 4), and the second case portion 4 is rotated toward the first case portion 3 with the hinges 2A and 2B (FIG. 5) as fulcrums. The first latching claw portion 49A and the second latching claw portion 49B are latched to the first latching through hole 39a and the second latching through hole 39b, and the convex portion 39C is inserted into the concave portion 49c. Case 2 is in a closed state. Thus, the first core first surface 6A (FIG. 4) of the first core 6 and the second core first surface 7A of the second core 7 come into contact with each other, and the first core second surface 6B of the first core 6 is contacted. (FIG. 4) and the second core second surface 7B (FIG. 4) of the second core 7 abut.

  In this case, the first core 6 moves in the direction opposite to the urging direction of the first core pressing pieces 33A and 33B, and the first core holding members 36A and 36B in the first to fourth cutouts 61a to 61d, The second core holding members 37A and 37B are unlocked, and the second core 7 is also moved in the direction opposite to the urging direction of the second core pressing pieces 43A and 43B, so that the first to fourth cutouts 71a. The first core holding members 46A and 46B and the second core holding members 47A and 47B in -71d are unlocked. As a result, the core 5 including the first core 6 and the second core 7 is elastically held by the first core pressing pieces 33A and 33B and the second core pressing pieces 43A and 43B in the case 2 in the z-axis direction. It becomes a state.

  As described above, the first core 6 and the second core 7 are in a state of being elastically held in the y-axis direction. Therefore, when the noise absorbing device 1 is attached to the cable 9 as shown in FIG. 9, the core 5 is elastic in the case 2 in the direction orthogonal to the x-axis direction, that is, the direction orthogonal to the cable insertion direction. Even if an impact from either the y-axis direction or the z-axis direction is applied to the noise absorber 1, the impact can be absorbed and damage to the core 5 can be prevented.

  The fixing member 8 is for fixing the case 2 to a mounting board or the like (not shown). As shown in FIG. 1, the fixing member 8 includes an outer periphery copying portion 81, a first flat plate portion 82, and a second flat plate portion 83. These are integrally formed by bending a metal plate. More specifically, the fixing member 8 includes a first flat plate portion 82 that is a portion that is not bent from a portion near one end of a substantially rectangular metal plate having a substantially band shape to a middle portion in the longitudinal direction. Have.

  Then, the metal plate is bent in an arc shape along the peripheral surface of the case 2 from the end portion of the first flat plate portion 82 corresponding to the middle portion, and the peripheral surface is substantially omitted. From the place bent about three quarters of the turn to the first flat plate portion 82, it approaches the upper surface 82 </ b> D of the first flat plate portion 82 perpendicularly, and this portion follows the outer periphery of the fixing member 8. Part 81 is formed. Then, it is further bent from the portion substantially perpendicularly, arranged substantially parallel to the first flat plate portion 82 and opposed to the first flat plate portion 82, and extends to a position facing one end of the metal plate, This portion forms the second flat plate portion 83 of the fixing member 8.

  Therefore, the outer periphery copying portion 81 is provided so as to follow and surround the case 2 in the circumferential direction. Further, one end 82 </ b> A (FIG. 2) of the first flat plate portion 82 is integrally connected to one end 81 </ b> A of the outer periphery copying portion 81 in the circumferential direction of the case 2. In addition, one end 83 </ b> A of the second flat plate portion 83 is integrally connected to the other end 81 </ b> B of the outer periphery copying portion 81 in the circumferential direction of the case 2. The lower surface 82C shown in FIG. 1 of the first flat plate portion 82 can be opposed to the surface of the mounting board (not shown) substantially in parallel when the noise absorbing device 1 is mounted on the mounting board (not shown). . Further, the lower surface 83C of the second flat plate portion 83 shown in FIG. 1 is disposed to face the upper surface 82D of the first flat plate portion 82 shown in FIG. Here, “substantially parallel” means that after the first flat plate portion 82 and the second flat plate portion 83 are in a completely parallel positional relationship, the first flat plate portion 82 and the second flat plate portion 82 are formed by the elasticity of the metal constituting the fixing member 8. Although the space between the flat plate portion 83 is widened and the positional relationship may be slightly deviated from the parallel positional relationship, this means that the positional relationship is included. Therefore, it includes a state in which the first flat plate portion 82 and the second flat plate portion 83 are in a completely parallel positional relationship.

  A first through hole 82a is formed in the first flat plate portion 82 as shown in FIG. The first through hole 82a is in a direction perpendicular to the lower surface 82C and the upper surface 82D of the first flat plate portion 82 shown in FIG. 1, that is, a direction perpendicular to the surface of the mounting substrate when mounted on a mounting substrate (not shown). The penetration direction is oriented. Similarly, a second through hole 83 a is formed in the second flat plate portion 83. The second through hole 83a is in a direction perpendicular to the lower surface 83C and the upper surface 83D of the second flat plate portion 83 shown in FIG. 1, that is, a direction perpendicular to the surface of the mounting board when mounted on a mounting board (not shown). The penetration direction is oriented.

  As shown in FIG. 1, each of the first through hole 82a and the second through hole 83a has a circular cross section cut by a plane perpendicular to the through direction, and the diameter of the first through hole 82a is the second through hole. It is larger than the diameter of the hole 83a, and the second through hole 83a and the first through hole 82a have a substantially coaxial positional relationship. Here, the substantially coaxial positional relationship refers to the first flat plate portion 82 in a state in which the first flat plate portion 82 and the second flat plate portion 83 maintain a substantially parallel positional relationship due to the elasticity of the metal constituting the fixing member 8. The second flat plate portion 83 may be slightly displaced relative to the second through-hole 83a, and the second through-hole 83a and the first through-hole 82a are not completely coaxial and slightly displaced. However, this means that such a positional relationship is included. Therefore, it includes that the second through hole 83a and the first through hole 82a have a completely coaxial positional relationship. A screw (not shown) is screwed into the first through hole 82a and the second through hole 83a from above in FIG. 1, and a mounting board (not shown) disposed below the first flat plate portion 82 in FIG. The fixing member 8 can be fixed to a mounting board (not shown) by screwing a screw (not shown) into a previously formed hole.

  Since the first through-hole 82a and the second through-hole 83a have cross sections cut by planes perpendicular to the penetration direction, the first through-hole 82a has a diameter larger than that of the second through-hole 83a. Even when the axial center position of the hole 82a and the axial center position of the second through hole 83a are slightly shifted, when viewed from the axial direction of the second through hole 83a on the second through hole 83a side. The entire second through hole 83a can be maintained in a state where it overlaps with a part of the first through hole 82a, and the screw can be easily inserted into the first through hole 82a and the second through hole 83a.

  As shown in FIG. 1, the other end 82 </ b> B portion of the first flat plate portion 82, that is, one end of the metal plate constituting the fixing member 8, extends above the first flat plate portion 82 in a substantially U shape. A locking portion 84 is provided. The other end 83B of the second flat plate portion 83, that is, the other end of the metal plate constituting the fixing member 8 can be temporarily locked to the substantially U-shaped inner peripheral side of the locking portion 84. .

  Since the locking portion 84 is thus provided, the case 2 is fixed to the fixing member 8 by locking the other end 83B portion of the second flat plate portion 83 to the other end 82B portion of the first flat plate portion 82. The case 2 can be held by the fixing member 8 to such an extent that the case 2 does not fall off from the fixing member 8 without applying an external force to the fixing member 8 in order to hold it.

  A pair of axially extending portions 85 and 86 are provided at the one end 82 </ b> A portion of the first flat plate portion 82 that is a portion of the fixing member 8 and is connected to the outer periphery copying portion 81. The axially extending portions 85 and 86 extend in a band shape toward one end and the other end in the axial direction of the case 2, that is, in the left-right direction in FIG. 3, and the axially extending portions 85 and 86 extend. One end convex portion 87 and the other end convex portion 88 projecting in a substantially rectangular shape in the radial direction of the case 2 when viewed from the side of the noise absorbing device 1 are provided at the output end. When the case 2 is held by the fixing member 8 as shown in FIGS. 1 to 3, the one end convex portion 87 has a third end wall portion 4 </ b> B that constitutes one end portion in the axial direction of the case 2. The fourth end wall portion 4 </ b> C constituting one end portion in the axial direction of the case 2 can contact the other end portion convex portion 88.

  Since the one end convex portion 87 and the other end convex portion 88 are thus provided, the third end wall portion 4B of the case 2 abuts on the one end convex portion 87 and the fourth convex portion 88 is in contact with the other end convex portion 88. By contacting the end wall portion 4C, the case 2 can be positioned at a predetermined position of the outer periphery copying portion 81 in the axial direction of the case 2. Accordingly, it is possible to prevent the case 2 from being fixed to the outer periphery copying portion 81 at a position shifted from the predetermined position.

  Since the fixing member 8 is made of metal, the fixing member 8 can be made strong against vibration and thermal shock, and the noise absorbing device 1 can be used for in-vehicle use.

  Further, a mounting substrate (not shown) connected to the outer periphery copying portion 81 provided so as to surround and hold the case 2 along the peripheral surface of the case 2 and one end 81A of the outer periphery copying portion 81 in the circumferential direction of the case 2 A first flat plate portion 82 formed with a first through hole 82a in which a through direction is directed in a direction perpendicular to the surface of the mounting substrate (not shown); A second through-hole 83a is formed which is connected to the other end 81B of the outer periphery copying portion 81 in the circumferential direction and is disposed opposite to and substantially parallel to the first flat plate portion 82 and has a substantially coaxial positional relationship with the first through-hole 82a. Since the second flat plate portion 83 is provided, a screw (not shown) is passed through the first through hole 82a and the second through hole 83a, and a screw (not shown) is formed in a screw hole previously formed on a mounting board (not shown). Mounting base not shown easily by screwing It is possible to fix the noise absorber 1. Therefore, the fixing member 8 having a relatively simple structure can be obtained, and the configuration of the entire noise absorbing device 1 can be simplified.

  Furthermore, when the inner surface of the outer peripheral copying portion 81 is in close contact with the peripheral surface of the case 2, the first flat plate portion 82 and the second flat plate portion 83 are designed so that a gap is formed between them. When a screw (not shown) is passed through the through hole 82a and the second through hole 83a, and a screw (not shown) is screwed into a screw hole previously formed on a mounting board (not shown), the first flat plate portion 82 and When the first flat plate portion 82 and the second flat plate portion 83 are attracted to each other so that there is no gap between the second flat plate portion 83, the outer peripheral copying portion 81 is in a state in which the case 2 is tightened and held. it can.

  In addition, the core has a halved shape composed of a pair of first core 6 and second core 7 that can be divided into two on a plane including the axis of case 2, and first core 6 and second core 7 are in contact with each other. As a result, the inner peripheral surface defines a cable insertion passage, and the case 2 has a pair of a first case portion 3 and a second case portion 4 that can be divided into two on a plane including the axis of the case 2. Since the case portion accommodates the first core 6 and the second core 7 respectively, the fixing member 8 can be used even when the first hooking piece 39A and the second hooking piece 39B are damaged. Since the case 2 is mounted and held by the first case portion 3 and the second case portion 4 are separated from each other, the first core 6 and the second core 7 accommodated therein are prevented from coming out. can do.

  Further, since the outer shape of the case 2 cut by a plane perpendicular to the axial direction of the case 2 is circular, it can be configured to be resistant to vibration and thermal shock.

  The noise absorber 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, a belt-like groove having substantially the same width as that of the outer periphery copying portion 81 may be formed on the peripheral surface of the case, and the outer periphery copying portion 81 may be fitted into the groove. By fitting in this way, the case can be positioned at a predetermined position of the outer periphery copying portion 81 in the axial direction of the case.

  Further, the configuration of the one end convex portion and the other end convex portion is not limited to that of the present embodiment. For example, as shown in FIG. 10, the one end projection 187 and the other end projection 188 of the noise absorbing device 101 are not provided at the extension ends of the pair of axial extension portions 185 and 186, respectively. You may provide in the position in the middle of the extension direction of the axial direction extension part 185,186. In this case, the bottom portion shown in FIG. 10 of the case 102 facing the one end convex portion 187 and the other end convex portion 188 can be engaged with the one end convex portion 187 and the other end convex portion 188, respectively. The joint holes 102a and 102a only need to be formed. As shown in FIG. 10, the one end protrusion 187 and the other end protrusion 188 engage with the engagement holes 102 a and 102 a, respectively, so that the case 102 is positioned at a predetermined position of the outer periphery copying portion 81 in the axial direction of the case 102. 102 can be positioned.

  Further, the shapes of the case, the core, and the outer periphery copying portion are not limited to those in the present embodiment. For example, the case 2 has a substantially cylindrical shape. However, the case 2 may have a substantially prismatic shape. In this case, the outer periphery copying portion may have a shape that follows the substantially prismatic shape of the case. Moreover, the latching | locking part is not limited to the thing of this Embodiment, The other end part of a 2nd flat plate part should just be latched to the other end part of a 1st flat plate part temporarily.

1 is a perspective view of a noise absorbing device according to an embodiment of the present invention. The side view of the noise absorption apparatus by embodiment of this invention. The rear view of the noise absorber by embodiment of this invention. The disassembled perspective view of the case and core of the noise absorber by embodiment of this invention. The expansion | deployment top view of the noise absorber case by embodiment of this invention. The expanded sectional view in the yz plane of the case of the noise absorber by embodiment of this invention. The expansion | deployment perspective view which shows the state which accommodated the core in the case of the noise absorber by embodiment of this invention. The expanded sectional view in the yz plane in the state which accommodated the core in the case of the noise absorber by embodiment of this invention. The perspective view which shows the state which penetrated the cable to the noise absorption apparatus by embodiment of this invention. The rear view of the modification of the noise absorber by embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Noise absorber 2 Case 3 1st case part 4 2nd case part 5 Core 6 1st core 7 2nd core 8 Fixing member 81 Outer periphery copying part 81A, 82A, 83A One end 81B, 82B, 83B The other end 82 1st flat plate Portions 82C, 83C Lower surface 82D, 83D Upper surface 82a First through hole 83 Second flat plate portion 83a Second through hole 84 Locking portion 87 One end convex portion 88 The other end convex portion

Claims (6)

A core formed with a cable insertion path through which a cable can be inserted;
A case containing the core;
A fixing member for fixing the case to a mounting substrate or the like,
The fixing member is made of metal, and an outer periphery copying portion provided to wrap and hold the case along the peripheral surface of the case;
A first penetration that is connected to one end of the outer periphery copying portion in the circumferential direction of the case and can be opposed substantially parallel to the surface of the mounting board, and a penetration direction is directed in a direction perpendicular to the surface of the mounting board. A first flat plate portion in which a hole is formed;
A second through-hole connected to the other end of the outer periphery copying portion in the circumferential direction of the case and disposed opposite to and substantially parallel to the first flat plate portion and having a substantially coaxial positional relationship with the first through-hole A noise absorber having a second flat plate portion formed.   The other end of the first flat plate portion connected to one end of the outer periphery copying portion in the circumferential direction of the case is connected to the other end of the outer periphery copying portion in the circumferential direction of the case. The noise absorbing device according to claim 1, further comprising a locking portion capable of temporarily locking the other end portion with respect to the one end portion of the two flat plate portions. One end of the fixing member in the axial direction of the case is provided with an end protrusion that protrudes inward in the radial direction of the case and can abut against one end of the case in the axial direction.
The other end portion of the fixing member in the axial direction of the case is provided with a convex portion at the other end protruding inward in the radial direction of the case and capable of contacting the other end portion in the axial direction of the case. The noise absorbing device according to claim 1 or 2, characterized by the above. The core has a halved shape composed of a pair of core parts that can be divided into two on a plane including the axis of the case, and the pair of core parts form a ring by being brought into contact with each other to form an inner peripheral surface. Defining the cable insertion passage;
4. The case according to claim 1, wherein the case includes a pair of case parts that can be divided into two on a plane including the axis of the case, and each of the case parts accommodates the core part. The noise absorber as described.   The noise absorbing device according to any one of claims 1 to 4, wherein an outer shape of the case cut by a plane perpendicular to the axial direction of the case is circular.   Cross sections of the first through hole and the second through hole cut by a plane perpendicular to the penetrating direction are each circular, and the diameter of the first through hole is larger than the diameter of the second through hole. The noise absorber according to any one of claims 1 to 5.

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