JP5526007B2 - Noise absorber - Google Patents

Description

  The present invention relates to a noise absorbing device for absorbing a noise current (noise) flowing in an electric wire (cable) of an electronic device and preventing malfunction of the electronic device due to the noise, and particularly when the noise absorbing device is attached to a cable. The present invention relates to a noise absorbing device capable of stably holding a mounted state.

As this type of noise absorber, a noise absorber disclosed in Patent Document 1 has been proposed. This noise absorber has a structure in which cylindrical ferrite divided in half in the axial direction is fitted into a plastic case, and the electric wire connected to the electronic device is attached to the electric wire so that the case is sandwiched by the ferrite from both sides. It has become. Further, in Patent Document 1, when a wire holding member for holding an electric wire is erected on one of a pair of cases so that the noise absorber is not moved relative to the electric wire, and the case is closed In the other case, the electric wire holding member is pressed and deformed toward the central axis, and the noise absorber is fixed to the electric wire by holding the electric wire with the pressing force accompanying the deformation.

Japanese Utility Model Publication No. 5-82015

  In the noise absorber of Patent Document 1, the electric wire clamping member has a configuration in which a pair of linear clamping pieces are straightly projected from one case, and the other case is used as the clamping piece when the case is closed. The pair of holding pieces are deformed to the center axis side to generate a pressing force against the electric wire, but the holding is not easily performed due to the relationship between the distance between the pair of holding pieces and the diameter of the electric wire. There is a problem. In other words, if the gap between the pair of holding pieces is designed to be large in order to hold a large-diameter electric wire, a gap will be generated between the holding piece and the electric wire when an attempt is made to hold a small-diameter electric wire, and the electric wire will be pressed sufficiently. It cannot be clamped by pressure. On the other hand, if the gap between the pair of holding pieces is designed to be small enough to hold the thin wire, it becomes difficult to insert the thick wire between the holding pieces. It spreads and cannot be clamped with a suitable pressing force. Therefore, the noise absorber of Patent Document 1 has a narrow application width with respect to the diameter of the electric wire, and it is difficult to configure the noise absorber as a general-purpose noise absorber corresponding to a wide range of electric wire diameters.

  An object of the present invention is to provide a noise absorbing device that can be suitably attached to a cable having a wide range of diameters regardless of differences in electric wire diameters, that is, cable diameters.

  The noise absorbing device of the present invention includes first and second divided cases, each supporting a divided core internally and engaging each other with a cable interposed therebetween to form a cylindrical container. Is provided with a pair of cable holding portions for holding the cables in the radial direction, and the second divided case is provided with a cable holding pressing portion that presses the two cable holding portions in a direction approaching when engaged. In addition, the cable holding portion is extended in the direction facing the cable from the tip of the base piece so as to be opposed to the position where the cable is held, and is elastic in the opposing direction of both cable holding portions. A deformable clamping piece is provided.

Further, in the noise absorbing device of the present invention, the base element of the cable clamping portion Ru is opposed by the distance larger than the diameter of the cable up to diameter.

Further, the holding piece is e Bei a tapered portion having a reduced spacing dimension in a tapered shape toward the proximal direction from the distal end of the base piece, and a parallel portion extending substantially parallel toward the more proximally from the tapered portion The parallel portions are configured to be opposed to each other at a smaller interval than the diameter of the cable having the minimum diameter .

According to the present invention, since the clamping piece that is easily elastically deformed is provided in the opposing direction of the pair of cable clamping portions, that is, in the radial direction of the cable, the clamping piece deforms following the difference in the thickness of the cable. The pinching force can be exhibited corresponding to cables having different thicknesses. In particular, in the case of a thick cable, the holding force of the cable is increased by the elastic force at the tapered portion, and in the case of a thin cable, the holding force of the cable is increased by the elastic force between the tapered portion and the parallel portion. The cable can be firmly clamped. Thereby, according to this invention, it can mount | wear with the noise absorption apparatus firmly supported with respect to the cable of a wide range of thickness, and can be comprised as a highly versatile noise absorption apparatus.

The external appearance perspective view of the noise absorber of the present invention. The external appearance perspective view of the state which removed the division | segmentation core. The external appearance perspective view of the state which attaches a noise absorber to a cable. The external appearance perspective view and front view of the state which attached the noise absorption apparatus to the cable. The top view of the state which opened the case. The expanded sectional view which follows the VI-VI line of FIG. 5, and sectional drawing of the state which closed the division | segmentation case. Sectional drawing which shows the state with which a large diameter cable is mounted | worn. Sectional drawing which shows the state with which a medium diameter cable is mounted | worn. Sectional drawing which shows the state with which a small diameter cable is mounted | worn.

  Next, an embodiment of the present invention will be described. FIG. 1 is an external perspective view showing a state before the noise absorbing device of the present invention is attached to a cable. A case 1 configured in a cylindrical shape when closed, and a ferrite core built in the case 1 2 and. FIG. 2 is an external perspective view of the core 2 taken out from the case 1, and the core 2 is configured as a pair of split cores 2A and 2B having a semi-cylindrical shape in which a cylindrical core is split into two in the radial direction. . Each split core 2A, 2B has a stepped portion 21 formed on both end faces in the length direction, and the stepped portion 21 is configured as a supporting projection used when supporting the interior of the case 1. As will be described later, the support protrusion 21 is engaged with a core support protrusion 14 provided on the case 1 so as to prevent the case 1 from falling off when it is supported inside the case 1. .

  The case 1 has a semi-cylindrical shape that can accommodate the divided cores 2A and 2B, respectively, and includes a pair of divided cases 1A and 1B having semicircular cutouts 1a for inserting cables through both end walls. Yes. When the right split case 1A in FIGS. 1 and 2 is referred to as a first split case, and the left split case 1B is referred to as a second split case, the first and second split cases 1A and 1B are opposite edges. Are connected to each other by a flexible connecting piece 11 provided on the right side of the first divided case 1A, and an engagement protrusion 12a is provided on the right edge of the first divided case 1A. Is provided with an engagement frame portion 12b that engages with the engagement protrusion 12a. Then, as shown in an external perspective view of FIG. 3, the cable C is inserted into the inner diameter recess of the split core 2A housed in the first split case 1A, and the second split case 1B is bent while the connecting piece 11 is bent and deformed. As shown in FIGS. 4A and 4B, the perspective view and the front view of the split cases 1A and 1B are obtained by facing the split case 1A and engaging the engaging frame portion 12b and the engaging protrusion 12a. The cylindrical case 1 is assembled and attached to the cable C with the cable C sandwiched in the center hole of the case 1. At this time, it is needless to say that the split cores 2A and 2B come into contact with each other to form a cylindrical state, surround the cable C, and absorb noise flowing through the cable C.

Referring to FIG. 2 again, each of the first and second divided cases 1A and 1B has a tongue-shaped core pressing piece 13 cut off on the bottom surface thereof so as to exert an elastic force inward in the radial direction. In addition to being formed in a notch, core support protrusions 14 are provided at both ends in the length direction so as to protrude inward from both edges toward a required dimension. Then, as shown in the plan view of FIG. 5 and the enlarged cross-sectional view of FIG. 6A taken along the line VI-VI of FIG. In addition, each of the split cores 2A and 2B has the support protrusions 21 provided at both ends engaged with the core support protrusions 14, and at the same time, the bottom surfaces (circumferential surfaces) of the split cores 2A and 2B are By being pressed in the direction, the divided cores 2A and 2B are supported in the interior of the divided cases 1A and 1B while being prevented from falling off.

  Further, the first split case 1A is provided with a pair of cable holding portions 15 at positions along the inner surfaces of the end walls at both ends. Further, stoppers 16 are provided at both outer positions of the cable holding portions 15. The cable clamping portion 15 is for abutting the cable C from both sides to clamp the cable C, and for supporting the noise absorbing device to the cable C in a fixed state by this clamping force. The stopper 16 is for abutting against the cable holding portion 15 when the cable holding portion 15 is deformed to both outer sides to suppress the deformation of the cable holding portion 15. The second divided case 1B is provided with partition walls 17 at positions along the inner surfaces of the end walls at both ends, and between the end walls at both outer positions of the partition walls 17 18 is provided.

  Referring to FIG. 6A, the cable holding portion 15 is erected on the bottom surface of the first divided case 1A, and has a gap dimension D2 larger than the inner diameter dimension D1 of the core 2 in the width direction of the first divided case 1A. Opposed to each other, a base piece 151 extending substantially straight in the opening direction of the first divided case 1A, and a sandwiching piece 152 folded inward from the tip of the base piece 151 toward the bottom surface. As can be seen from FIG. 6B, the base piece 151 has an inner diameter height of the core 2 constituted by a pair of split cores 2A and 2B when the second split case 1B is closed to the first split case 1A. The length is almost reached. The sandwiching piece 152 includes a taper portion t whose interval is gradually narrowed from the tip of the base piece 151 and a parallel portion p that extends substantially in parallel downward from the tip of the taper portion t. The opposing distance at the tip of the taper part t, that is, the opposing distance dimension D3 of the parallel part p, is set to be smaller than the outer diameter dimension of the thinnest cable assuming that the noise absorbing device is applied. The taper portion t is set to a length where the tip position is outside (lower in the drawing) from the inner diameter center of the first split core 2A, and the parallel portion p has a tip of the inner diameter of the first split core 2A. It extends to the outside from the outer edge. In this embodiment, a narrow rib 153 that can bite into the outer skin of the cable C is provided on the opposing surface extending from the tapered portion t to the parallel portion p.

  As shown in FIG. 6 (b), the cable holding / pressing portion 18 provided in the second divided case 1B has the cable holding portion when the second divided case 1B is closed and engaged with the first divided case 1A. 15 is brought into contact with the outer surface near the tip of the base piece 151 and exerts a pressing force that elastically deforms the base piece 151 or the holding piece 152 inward when the base piece 151 comes into contact. That is, the pair of cable holding and pressing portions 18 are opposed to each other in the width direction across the notch 1a of the second divided case 1B, and the inner edge of the cable holding and pressing portion 18 is each base piece 151 of the cable holding portion 15. The gap dimension is set to be smaller than the gap between the outer side surfaces of the first and second outer sides of the cable holding portion 15 when the second divided case 1B is closed to the first divided case 1A as will be described later. Thus, it is configured in a curved shape.

  A cable holding operation when the noise absorbing device having the above configuration is attached to a cable will be described. FIG. 7 is a cross-sectional view showing a case where the cable C1 is attached to the thick cable C1. Needless to say, the maximum diameter of the thick cable C1 is a diameter corresponding to the inner diameter of the split cores 2A and 2B. When the noise absorbing device is attached to the cable C1, as shown in FIG. 7A, the cable C1 is disposed so as to enter the inner diameter of the first divided core 2A of the first divided case 1A. As shown in FIG. 7B, the cable C1 is inserted between the pair of cable holding portions 15. The cable C1 enters between the holding pieces 152 of the cable holding portion 15, particularly between the holding pieces 152 while being elastically deformed so as to expand the tapered portion t outward, and from both sides by the elastic force at the tapered portions t of both the holding pieces 152. It is pinched. At this time, since the cable C1 has a large diameter, the base piece 151 is also deformed so as to fall down on both outer sides. However, both outer surfaces of the base piece 151 are prevented from coming into contact with the stopper 16 and greatly deformed on both outer sides. Therefore, the cable holding portion 15 is prevented from being damaged, and the cable holding piece 15 interferes with the second divided case 1B when the second divided case 1B is closed with respect to the first divided case 1A in the next step. It will not be impossible to close. Then, as shown in FIG. 7C, when the second divided case 1B is closed and engaged with the first divided case 1A, the cable holding pressing portion 18 of the second divided case 1B becomes the base piece 151 of the cable holding portion 15. The outer surface is pressed inward, and the base piece 151 is elastically deformed into a curved state. As a result, the taper portion t of the sandwiching piece 152 is also deformed inward, and the cable C1 is sandwiched while being curved and closely adhered along the peripheral surface of the cable C1. As a result, the noise absorbing device is firmly fixed to the cable C1 by the large clamping force generated by both the deformation caused by the inward bending of the base piece 151 and the elastic deformation of the clamping piece 152 accompanying this.

When the cable has a medium diameter, when the cable C2 is inserted between the holding pieces 152 of the cable holding portion 15 as shown in FIG. 8A, the cable C2 is connected to the tapered portion t as shown in FIG. It enters the boundary region of the parallel part p and is clamped by these elastic return forces. Then, when the second divided case 1B is closed and engaged with the first divided case 1A, the cable holding / pressing portion 18 of the second divided case 1B becomes the base piece of the cable holding portion 15 as shown in FIG. The outer surface of 151 is pressed inward, and the base piece 151 is elastically deformed inward. Thereby, the elastic force of the clamping piece 152 is increased, and the cable C2 is firmly clamped. At this time, the deformation of the base piece 151 is slightly tilted inward, and the deformation amount of the sandwiching piece 152 is smaller than that of the large-diameter cable, and the sandwiching pieces 152 on both sides are almost parallel. As a result, the noise absorbing device is firmly fixed to the cable C <b> 2 by the clamping force generated by both the deformation due to the tilting of the base piece 151 and the elastic deformation of the clamping piece 152. At this time, as shown by an arrow in FIG. 8C, even when the cable C2 moves in the radial direction between the holding pieces 152, the holding state of the cable C2 is secured.

When the cable has a small diameter, when the cable C3 is inserted between the holding pieces 152 of the cable holding portion 15 as shown in FIG. 9A, the cable C3 has a tapered portion t as shown in FIG. 9B. It passes through to the parallel part p. When the diameter dimension of the cable C3 is larger than the interval dimension of the parallel part p, the parallel part p is expanded in a “C” shape, but when the diameter dimension of the cable C3 is smaller than the interval dimension of the parallel part p, as shown in FIG. The parallel part p remains in a parallel state. Then, when the second divided case 1B is closed and engaged with the first divided case 1A, the cable holding / pressing portion 18 of the second divided case 1B becomes the base piece of the cable holding portion 15 as shown in FIG. The outer surface of 151 is pressed inward, and the base piece 151 is elastically deformed inward. At this time, since the parallel portion p is deformed into a “C” shape, the cable C3 is held between the parallel portions p, and is held in a state where movement to the inner diameter side is prevented. As a result, the noise absorbing device is firmly fixed to the cable C3 by the clamping force generated between the clamping pieces 152 mainly due to the deformation of the base piece 151 due to the fall.

  As described above, the cable holding portion 15 includes the holding pieces 152 that are easily elastically deformed in the radial direction on the inner side of the base piece 151. Therefore, the holding pieces 152 are formed regardless of the difference in the thicknesses of the cables C (C1 to C3). The cable C is deformed following the thickness of the cable C, and can exhibit a clamping force corresponding to cables of different thicknesses. In particular, in the case of a thick cable, the clamping force of the cable is increased by the clamping force generated by the deformation of the base piece 151 and the clamping piece 152, and in the case of a thin cable, the elastic force generated in the clamping piece 152 by the deformation of the base piece 151. Thus, the cable clamping force can be obtained, and in any case, the cable can be firmly clamped. Therefore, the noise absorbing device can be attached to a cable having a wide range of thickness in a strongly supported state, and can be configured as a highly versatile noise absorbing device.

  Note that when an external force in the cable length direction is applied to the noise absorbing device while the cable C is held, a force for deforming the cable holding portion 15 in the length direction of the cable C is generated. The cable 17 is prevented from being deformed by the partition wall 17 provided in the second divided case 1B disposed adjacent to the portion 15 and the end wall of the divided case 1B, thereby preventing the cable C from moving in the length direction. Therefore, the state where the cable C is clamped is held.

  Here, the sandwiching piece 152 of the cable sandwiching portion 15 is formed to be thinner than the base piece 151, for example, so that it is easily elastically deformed, so that when the cable C is sandwiched, the sandwiching piece 152 is greatly deformed. The piece 151 is less deformed, and the cable C can be stably held by the cable holding unit 15. Further, by making the holding piece 152 easily elastically deformed, the holding force for the cable C can be relaxed, and the cable covering can be made less likely to be damaged. In recent years, the number of non-halogen cables has been increasing, and non-halogen cables are more susceptible to scratches because they have a weaker coating than vinyl chloride-coated cables. It becomes effective with. Further, even if the clamping force is eased in this way, the rib 153 provided on the clamping piece 152 is bitten into the covering of the cable C, thereby suppressing the cable C from moving in the length direction and increasing the clamping force. validate.

  In the embodiment, an example in which a single cable is clamped has been described. However, even when a plurality of cables are clamped in a bundle, noise is absorbed in the cable regardless of the difference in the thickness of the cable bundle. It is possible to mount the apparatus while firmly holding the apparatus.

  Here, the parallel portion described in the embodiment is referred to to distinguish it from the tapered portion. Therefore, when the small-diameter cable is sandwiched as described above, the parallel portion is deformed into a letter “C” and the cable is It is not always necessary to be parallel as long as it has a sandwiching function, and is almost parallel, that is, a tapered shape having a smaller taper angle than the taper portion, or a taper inclined at a small taper angle in the opposite direction to the taper portion. It may be a shape.

  The present invention can be applied to a noise absorber having a structure in which a split core is provided in each split case, and the split case is closed and attached to the cable so as to sandwich the cable.

1 Case 1A, 1B Split case 2 Core (ferrite core)
2A, 2B Split core 11 Connection piece 12a Engagement protrusion 12b Engagement frame part 13 Core pressing piece 14 Core support protrusion 15 Cable holding part 151 Base piece 152 Holding piece 153 Rib t Taper part p Parallel part 16 Stopper 17 Bulkhead 18 Cable holding Pressing part C (C1, C2, C3) cable

Claims (1)

Each of the split cores includes a first and a second split case that support the interior of the core and engage each other with a cable interposed therebetween to form a cylindrical container. The first split case holds the cable in the radial direction. A pair of cable holding portions, and the second divided case includes a cable holding pressing portion that presses the two cable holding portions toward each other when engaged, and the cable holding portion is in a position to hold the cable. a base element which is erected oppositely provided with an elastically deformable clamping pieces is extended to the side of the surface facing the tip end of the base piece in the cable in the opposite direction of both the cable clamping portion, said base element Are opposed to each other with a gap larger than the diameter of the cable having the maximum diameter, and the clamping piece has a tapered portion with a taper shape reduced from the distal end of the base piece toward the proximal end, and the tapered portion. Further proximal Toward direction and a parallel portion extending substantially parallel, wherein the parallel portions noise absorber, characterized in that disposed opposite a smaller spacing than the diameter of the cable minimum diameter dimensions.

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