Structure and method for fixing ferrite core and housing structure of electronic device

Abstract

To prevent a ferrite core from being fallen by vibration.SOLUTION: A base 2 is attached to an annular ferrite core 1 and a bracket 5 having an inverse concave shaped vertical cross section is fixed to a housing 10. The base 2 is fixed to the bracket 5. The bracket 5 and the housing 10 are spaced a predetermined distance apart from each other to form a space part. A binding band 6 is inserted into the space part and a cavity part 1b of the ferrite core 1 and tightened to bind the bracket 5 and the ferrite core 1 to each other.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a technique for fixing a ferrite core (a magnetic body made of ferrite) for electromagnetic noise suppression to the housing of an electronic device. [Background technology]

[0002] As is well known, in electric vehicles, the voltage of the battery installed as a power source is passed through a conversion circuit such as a DC / DC converter to generate a control power supply voltage (e.g., +5V, ±15V) for driving printed circuit boards. Such a limited power supply voltage unit is often housed in a single housing (controller housing).

[0003] Conversion circuits usually involve the on / off operation of switching elements, which generates electromagnetic noise. To prevent malfunctions of printed circuit boards and other devices due to electromagnetic noise, ferrite cores are installed in the paths of the conversion circuits (for example, in the wires connecting the battery and DC / DC converter).

[0004] For example, in electric vehicles, ferrite cores formed in a circular (approximately doughnut) shape are used. In this case, an electric wire (cable) is wound around the circular part of the ferrite core, but in many cases the core is left suspended from the electric wire, or it is sometimes wrapped in heat-shrink tubing and used while being held close to the electric wire.

[0005] 4 and 5, a fixing structure using a separate ferrite core base (hereinafter referred to as the base) 2 is also employed. According to this fixing structure, the ferrite core 1 is fixed by inserting the claws 3 of the base 2, which is fixed to the controller housing with screws, into a socket (not shown) for the ferrite core 1. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2013-69658 Summary of the Invention [Problem to be solved by the invention]

[0007] For example, electrical equipment mounted on vehicles is required to be vibration resistant, and construction machinery in particular is required to be vibration resistant to high acceleration vibrations.

[0008] However, if the ferrite core 1 is attached to the electric wire in a suspended state as described above, vibrations may cause the ferrite core 1 to swing and collide with surrounding components, and may also pull on the electric wire, causing the connection to break. Also, although a fixing structure using the base 2 can fix the ferrite core 1 more stably than a suspended state, there is a risk that the ferrite core 1 may fall off the base 2 due to severe vibrations.

[0009] Therefore, as shown in Patent Document 1, a method has been proposed in which a metal fitting for placing the ferrite core 1 on the connector is provided and secured with a cable tie. However, when vibration occurs, the load of the ferrite core 1 is applied to the metal fitting, which may bend or break, causing the ferrite core 1 to fall off.

[0010] The present invention has been made to solve the problems of the prior art, and aims to prevent the ferrite core from falling off due to vibration. [Means for solving the problem]

[0011] (1) One aspect of the present invention is a structure for fixing a ferrite core for noise suppression to a housing of an electronic device, a base attached to the ferrite core; a bracket fixed to the housing; Equipped with The base is fixed to the bracket, and the ferrite core and the bracket are bound together.

[0012] The present invention can also be configured as a housing structure for an electronic device that includes the ferrite core fixing structure.

[0013] (2) Another aspect of the present invention is a method for fixing a ferrite core for noise suppression to a housing of an electronic device, comprising the steps of: fixing a bracket to the housing; a step of fixing a base attached to the ferrite core to the bracket; a step of bundling the ferrite core and the bracket; It is characterized by having: [Effects of the Invention]

[0014] According to the present invention, it is possible to prevent the ferrite core from falling off due to vibration. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a perspective view showing a fixing structure of a ferrite core according to an embodiment of the present invention. [Figure 2] Front view of the same. [Figure 3] FIG. [Figure 4] FIG. 10 is a perspective view of the ferrite core attached to the base. [Figure 5] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, a fixing structure (fixing method) for a ferrite core according to an embodiment of the present invention will be described. This fixing structure is used when fixing a ferrite core for electromagnetic noise suppression to the housing of an electronic device, and is applied to fixing to the controller housing of an electric vehicle, for example.

[0017] That is, as mentioned above, the limited voltage generating unit such as the conversion circuit (e.g., DC / DC converter) of the electric vehicle is housed in the controller housing. To prevent malfunction of printed circuit boards and the like due to electromagnetic noise generated by this conversion circuit, a ferrite core for noise suppression is fixed to the controller housing. [Example]

[0018] An embodiment of the fixing structure will be described with reference to Figures 1 to 3. Here, the same components as those in Figures 4 and 5 will be described using the same reference numerals.

[0019] <Configuration example> In this embodiment, when fixing the ferrite core 1 to the controller housing, a bracket 5 and a cable tie 6 are used to prevent the ferrite core 1 from falling off the base 2 due to vibration. Note that 10 in Figures 1 to 3 indicates the fixing point of the ferrite core 1 on the controller housing, and in this embodiment, this fixing point will be referred to as housing 10.

[0020] (1) As shown in Figures 1 and 2, the ferrite core 1 is attached to a bracket 5 using a base 2. The ferrite core 1 is mainly composed of an annular portion (outer periphery) 1a formed in an annular (substantially doughnut) shape, and is provided with a connecting portion 1c at the bottom of the annular portion 1a.

[0021] An approximately cylindrical hollow portion 1b is formed within the annular portion 1a, and an electric wire (cable) connecting the battery and the conversion circuit is inserted into the hollow portion 1b, and an insertion port (not shown) is formed at the bottom of the connecting portion 1c.

[0022] The base 2 is formed in a flat plate shape and includes a pair of box sections 3a (see FIG. 5) formed on the plane, claw sections 3 formed on the box sections 3a, and a pair of through holes 2a (see FIG. 3) formed on a diagonal line. Here, the ferrite core 1 is attached to the base 2 by inserting the claw sections 3 into the insertion holes.

[0023] (2) As shown in Figures 2 and 3, the bracket 5 is formed with an inverted concave shape in longitudinal section, and includes a pair of left and right leg portions 7 and a flat plate portion 8 between the legs 7. Each leg portion 7 includes a substantially horizontal fixing portion 7a fixed to a housing 10 of the electric vehicle, and a leg main body 7b formed by bending substantially vertically from the inner end of the fixing portion 7a, and a pair of through holes 11 formed in each fixing portion 7a.

[0024] The bracket 5 is fixed to the housing 10 by fastening the shanks of the bolts 12 inserted into the through holes 11 to the female threaded holes 10a of the housing 10. At this time, a space S with a predetermined interval is formed between the flat plate portion 8 and the housing 10, as shown in FIG.

[0025] The flat plate portion 8 is formed symmetrically, with a concave constricted portion 8a formed approximately in the center in the left-right direction (RL). This constricted portion 8a is located between the hollow portion 1b and the space portion S, and the base 2 is fixed to the bracket 5 by fastening the shanks of bolts 14 inserted into each through hole 2a to the female threaded holes 13.

[0026] (3) Figure 3 shows an example of a cable tie 6. This cable tie 6 has a long strap portion 6a, a tail portion 6b formed at one end of the strap portion 6a, and a head portion 6c formed at the other end of the strap portion 6a.

[0027] A fixing hole 6d is formed in the head portion 6c, and as shown in FIGS. 1 and 2, after the strap portion 6a is passed through the hollow portion 1b and the space portion S, the tail portion 6b is inserted into the fixing hole 6d.

[0028] At this time, the unevenness of the tail portion 6b engages with the claws in the fixing holes 6d, tightening the cable tie 6 and restraining the ferrite core 1 and the bracket 5. After this binding, the excess portion of the tail portion 6b is cut off. Note that the cable tie 6 is not limited to the configuration shown in FIG. 3, and other configurations may be used as long as it can be passed through the hollow portion 1b and the space portion S to bind the ferrite core 1 and the bracket 5.

[0029] <Installation process> The process of attaching the ferrite core 1 to the housing 10 will be described with reference to Fig. 3. Here, it is assumed that the claws 3 of the base 2 have been inserted into the insertion holes of the connecting portion 1c, and the ferrite core 1 has been attached to the base 2 in advance.

[0030] First, each fixing portion 7a of the bracket 5 is placed opposite the housing 10, and the female screw hole 10a is aligned with the through hole 11 to communicate with both 10a and 11. In this state, the shank of the bolt 12 is fastened to the female screw hole 10a through the through hole 11, thereby fixing the bracket 5 to the housing 10.

[0031] Next, the base 2 is placed opposite the flat plate portion 8 of the bracket 5, and the female screw hole 13 is aligned with the through hole 2a to connect the two. In this state, the shank of the bolt 14 is fastened to the female screw hole 13 through the through hole 2a, thereby fixing the base 2 to the bracket.

[0032] Thereafter, the strap portion 6a of the cable tie 6 is passed through the hollow portion 1b and the space portion S, and then the tail portion 6b is inserted into the fixing hole 6d to tighten the cable tie 6. This restrains the ferrite core 1 and the bracket 5 with the cable tie 6, completing the fixing of the ferrite core 1. The fixing structure of this embodiment has the following effects.

[0033] (1) As mentioned above, electrical equipment mounted on vehicles is required to be vibration resistant, and construction machinery in particular is required to be vibration resistant to high acceleration vibrations.

[0034] In this regard, although the conventional fixing structure using the base 2 can fix the ferrite core 1 more stably than a suspended state, there is a risk that the claws 3 will come off the insertion port due to strong vibrations, causing the ferrite core 1 to fall off from the base 2. Furthermore, in Patent Document 1, the load of the ferrite core 1 is applied to the metal fittings during vibrations, which may cause damage or bending of the metal fittings, resulting in the ferrite core 1 falling off.

[0035] In contrast, in this embodiment, the ferrite core 1 and the bracket 5 are restrained by the cable tie 6, so there is no risk of the claw portion 3 coming off the insertion port, and it is possible to prevent the ferrite core 1 from falling off the base 2 due to vibration.

[0036] (2) Furthermore, according to the fixing structure of this embodiment, after the strap portion 6a of the cable tie 6 is passed through the hollow portion 1b and the space portion S, the cable tie 6 is tightened to restrain the ferrite core 1 and the bracket 5.

[0037] Therefore, simply by adding a bracket 5 and a cable tie 6 to a fixing structure using a conventional base 2, it is possible to easily prevent the ferrite core 1 from falling off, and it can be applied to existing housings 10 at low cost, making it possible to provide a highly versatile fixing structure.

[0038] (3) Furthermore, since the bracket 5 has the constricted portion 8a, the strap portion 6a can be easily passed through the hollow portion 1b and the space portion S, and the strap portion 6a can be prevented from shifting out of position.

[0039] The present invention is not limited to the above-described embodiment, and can be modified and implemented within the scope of the claims. For example, the structure of a controller housing equipped with the fixing structure of this embodiment also constitutes the present invention.

[0040] Furthermore, the present invention is not limited to the housing 10 of electric vehicles, but can also be applied to the housing of electrical products (electronic devices) that are expected to vibrate during operation or transportation, and the structure of such a housing also constitutes the present invention. [Explanation of symbols]

[0041] 1...Ferrite core 1a...Annular part 1b…Cavity part 1c...Connection part 2...Bass 2a,11...Through hole 3...Claw part 3a...Box section 5...Bracket 6... Cable ties 6a...Strap section 6b...Tail section 6c...Head 6d…Fixing hole 7…Legs 7a…Fixed part 7b…Leg body 8...Flat plate part 8a...constricted part 10...Housing 10a, 13... Female threaded holes 12,14...volts

Claims

1. A structure in which a ferrite core for noise suppression is fixed to the housing of an electronic device, a base attached to the ferrite core; a bracket fixed to the housing; Equipped with The base is fixed to the bracket, The ferrite core and the bracket are bound together. A ferrite core fixing structure characterized by the above.

2. The ferrite core is formed in an annular shape, a space having a predetermined distance is provided between the bracket and the housing; The ferrite core and the bracket are fastened by passing a cable tie through the ferrite core and the space and fastening it.

2. The ferrite core fixing structure according to claim 1.

3. The bracket has a cross section formed in an inverted concave shape, Legs at both ends fixed to the housing; a flat plate portion between the legs; Equipped with The base is fixed to the flat plate portion, 3. The ferrite core fixing structure according to claim 2, wherein the space is formed between the flat portion and the housing.

4. A cavity is formed in the ferrite core, A constricted portion is formed in the flat plate portion, The constricted portion is located between the space portion and the hollow portion.

4. The ferrite core fixing structure according to claim 3.

5. A housing structure for an electronic device, comprising the ferrite core fixing structure according to any one of claims 1 to 4.

6. A method for fixing a ferrite core for noise suppression to a housing of an electronic device, comprising: fixing a bracket to the housing; a step of fixing a base attached to the ferrite core to the bracket; a step of bundling the ferrite core and the bracket; A method for fixing a ferrite core, comprising:

Images