JP2009252803A - Reactor fixing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reactor fixing structure easy to assemble by a simple structure, for surely fixing to a reactor case, dispersing stress of a spring member, and obtaining downsizing and space-saving. <P>SOLUTION: A plate 3 fixes a reactor 1 to a case 2 by inserting the plate 3 into an aperture between the case 2 and the reactor 1 to be inserted into the case 2 at a position corresponding to a side face region 1c containing a chamfer-cut surface 1b of a core 1a of the reactor 1. The plate 3 includes a fixed part 3a to be fixed to the case 2, a pressing part 3b for preventing the reactor from coming out, and a fitted part 3c to be inserted into the aperture between the reactor 1 and the case 2 for filling the aperture between the reactor 1 and the case 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a reactor fixing structure used in a so-called inverter circuit or active filter circuit.

  In the conventional reactor, in order to hold the core in the case, the core 1a and the case 2 are fixed using a leaf spring 11 as shown in FIG. More specifically, the leaf spring 11 having a lateral shape is fixed to the case by the bolt 4. The leaf spring 11 is fixed so as to urge the core 1 a to the opposite side of the case 2. With such a configuration, the reactor is fixed to the case to prevent the reactor from jumping out of the case.

In addition, expansion of the gap formed in the joint part of the core caused by the heat generation of the reactor device due to the difference in thermal characteristics due to different materials of the core and case, and the vibration of the core are transmitted to the outside of the housing In order to cope with the noise problem caused by the above, a technology has been proposed in which the core is attached to the aluminum case with a bolt via a retainer, and the core is separated from the case by inserting a cushion rubber between the retainer and the core. (See Patent Document 1).
JP 2004-241475 A

  Incidentally, in the conventional reactor fixing structure shown in FIG. 4, the position where the leaf spring is urged is only the side surface portion 1c among the positions corresponding to the side surface portions exposed from the coil of the core 1a. That is, the C surface cut part 1b which is an inclined surface inclined with respect to the inner peripheral surface of the reactor case in the side surface portion is not biased. FIGS. 5A and 5B show an image diagram in this case and a diagram of an analysis result of a stress distribution state with respect to the core due to the bias of the leaf spring.

  As shown in the image diagram of FIG. 5A and the stress distribution diagram of FIG. 5B, the stress of the leaf spring 11 is applied only to the side surface portion 1c, and this stress reaches the inner peripheral surface of the core 1a. I understand that. In such a case, stress is concentrated on the corner 1d of the inner peripheral surface of the core 1a, which causes a crack in the portion. Note that this stress distribution diagram is originally expressed in gradation by color, but for the sake of convenience of explanation, this is expressed as a simplified expression and the stress stages are expressed in three parts.

  The present invention solves the problems as described above, and its purpose is easy to assemble with a simple configuration and can securely fix the reactor to the case, and also distribute the stress of the spring member, It is another object of the present invention to provide a reactor fixing structure that realizes a small space saving.

  In order to achieve the above object, the invention of claim 1 is a gap between a reactor case and a reactor inserted into the reactor case, at a position corresponding to a side surface portion exposed from a coil in the core of the reactor, In the reactor fixing structure that fixes the reactor to the reactor case by inserting a plate, the plate includes a fixing portion that is fixed to the reactor case, a press-out portion for preventing the reactor from popping out, and the reactor. An insertion portion that is inserted into the gap of the reactor case and fills the gap between the reactor and the reactor case, and the pressing portion fixes the reactor with respect to the insertion direction of the reactor into the reactor case. A spring member is configured, and the interposition portion is the side surface portion of the core. A substantially arcuate spring member extending along the inner surface of the reactor case at a central portion of the spring member, with respect to the inner peripheral surface of the reactor case among the side surface portions of the core at both end portions. It contacts the inclined surface which inclined.

  In the above-described aspect, conventionally, only the portion other than the inclined surface of the side surface portion of the core is pressed by the spring member, but the inclined surface is biased by the both end portions of the spring member. Even in the case of spring members having the same reaction force, that is, spring members having the same width, the point of action is a position that enters the core side more. Accordingly, the width of the gap provided between the side surface portion other than the inclined surface of the core and the reactor case can be further reduced, space can be saved, and the entire reactor case can be reduced. .

  Conventionally, the stress of the spring member is applied only to the side surface portion other than the inclined surface, and this stress reaches the inner peripheral surface of the core, and the stress concentrates on the corner portion of the inner peripheral surface of the core, and cracks occur in the corresponding portion. However, in this aspect, the stress can be dispersed by urging the inclined surface at both ends of the spring member, and the stress is concentrated at the corners of the inner peripheral surface of the core. There is nothing.

  Here, in the present invention, the inclined surface of the side surface portion exposed from the coil in the core means that the C surface cut portion or the side surface portion disclosed in Patent Document 1 in the case shown in FIG. It also includes the U core outer side R portion.

  According to a second aspect of the present invention, in the first aspect of the present invention, the pressing portion includes a hole for adjusting a spring load at a center thereof. A third aspect of the present invention is characterized in that, in the first or second aspect of the present invention, the interposition portion includes a hole for adjusting a spring load at a central portion or both end portions.

  In the above aspect, the load of the spring member with respect to the core can be freely adjusted by providing a hole for adjusting the spring load at the center of the presser part, or at the center part or both end parts of the insertion part. It becomes like this.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the plate is inserted into the gap between the reactor case and the reactor at the both end portions of the insertion portion. Further, a guide piece for guiding the insertion is provided at the insertion ends of the both end portions, and the guide pieces are provided so as to be inclined from the reactor side to the reactor case side toward the insertion end.

  In the above-described aspect, the guide piece is provided to be inclined from the reactor side toward the reactor case side toward the insertion end, but if this is not present, the plate urges the reactor. The interpolated part has a tighter arc shape than the angle of the C surface cut part and the side part. Therefore, if both end portions of the side surface portion of the core are inserted as they are between the reactor and the reactor case, both end portions are caught on the upper portion of the core. Therefore, by providing a guide piece and inserting the plate while applying it to the upper end of the C-plane cut portion of the core, the plate can be easily inserted.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects of the present invention, the both end portions of the interpolating portion are arranged so that the inclined surface of the spring member is The center portion is pressed in a direction perpendicular to the inner peripheral surface of the reactor case.

  In the aspect as described above, regardless of the inclination of the C surface cut portion of the core, by pressing the C surface cut portion in the vertical direction with respect to the inner peripheral surface of the reactor case with which the central portion of the spring member abuts, The load of the spring member is not directed toward the center of the core, and the stress on the core can be dispersed and concentrated.

  According to the present invention, there is provided a reactor fixing structure that is easy to assemble with a simple configuration and can reliably fix the reactor to the case, distributes the stress of the spring member, and realizes a small space saving. Can be provided.

  Next, the best mode for carrying out the present invention (hereinafter referred to as “the present embodiment”) will be described with reference to the drawings. In the following, as an inclined surface of the side surface portion exposed from the coil in the core of the present invention, only the C surface cut portion will be exemplified and its embodiment will be shown. The present invention can also be applied to the U core outer side R portion. In addition, the same preconditions as those already described in the background art and problems are not repeated.

(1) Embodiment 1. [1. Outline of mounting structure]
The reactor mounting structure of this embodiment is demonstrated, showing a reactor and a reactor case in FIG. As shown in FIG. 1, the reactor mounting structure of the present embodiment inserts a plate 3 into a gap between a reactor 1 inserted into a case and a case 2. The plate 3 is screwed to the case 2 at a fixing portion 3a described later. With such a configuration, the reactor 1 and the case 2 are integrated and fixed.

[2. Specific configuration]
Next, a specific configuration of the structure for attaching the reactor to the case will be described. FIG. 2 is a perspective view showing the reactor 1 of the present embodiment and the plate 3 that urges the reactor 1 against the case 2.

  In FIG. 2A, the plate 3 is a gap between the case 2 (not shown) and the reactor 1 inserted into the case 2, and is formed on the side surface portion 1 c including the C surface cut portion 1 b of the core 1 a of the reactor 1. The reactor 1 is fixed to the case 2 by inserting the plate 3 at the corresponding position.

  The structure of the plate 3 will be described in detail. The plate 3 is inserted into a fixing portion 3a fixed to the case 2, a press-out portion 3b for preventing the reactor from jumping out, and a gap between the reactor 1 and the case 2, and the reactor 1 It comprises an insertion part 3c that fills the gap of the case 2.

  As described above, the fixing portion 3a is for fixing the plate 3 to the case 2, and screws are respectively inserted into the holes 3g provided at both ends in the width direction of the reactor 1, and the positions of the holes 3g are fixed. Are screwed in the holes 2a and 2b of the case 2 corresponding to.

  The presser part 3b is composed of a leaf spring that fixes the reactor 1 with respect to the insertion direction Y of the reactor 1 into the case 2, and the presser part 3b is provided with a hole 3f for adjusting the spring load at the center thereof. It has been. The hole 3f is an arbitrary component, and can be arbitrarily set according to the adjustment amount of the spring load on the core 1a, including the size and shape of the hole 3f and whether or not the hole 3f is provided.

  The interposing portion 3c is a substantially arcuate leaf spring member along the C-surface cut portion 1b of the core 1a, and abuts against the inner peripheral surface of the case 2 at the central portion 3d of the spring member, and at both end portions 3e. The C surface cut portion 1b of the core 1a is in contact with the core 1a. Here, the “substantially arcuate shape” in the present embodiment is, for example, (1) to (1) in FIG. As shown in 4), the shape may be any of an arc shape, a trapezoidal shape having two corners, or a triangular shape having one corner.

  Here, also in this insertion part 3c, you may provide the hole for adjusting a spring load in the center part 3d or both-ends part 3e similarly to the hole 3g demonstrated previously. This hole is also an optional component, and can be arbitrarily set according to the adjustment amount of the spring load with respect to the core 1a, including its size and shape, and whether or not it is provided.

  Further, since both end portions 3e of the interpolating portion 3c are in contact with the C-plane cut portion 1b of the core 1a, as shown in FIG. The angle Q of both end portions 3e with respect to the central portion 3d is configured to be larger than the angle P of the C-plane cut portion 1b with respect to the axis X, and the tip thereof is inclined toward the core 1a. In order for both end portions 3e to come into contact with the C-surface cut portion 1b, the inclination angle Q of the both end portions 3e needs to be slightly deeper than the inclination angle P of the C-surface cut portion of the core. Needless to say.

  When the interposing portion 3c having such a configuration is inserted into the gap between the reactor 1 and the case 2, the central portion 3d of the interposing portion 3c abuts on the inner peripheral surface of the case 2, and this is used as a fulcrum. The both end portions 3e of the insertion portion 3c are urged toward the one side. Both end portions 3e come into contact with the C-surface cut portion 1b of the core 1a. In this case, the direction of the pressing force of the both end portions 3e is opposite to the direction of the force generated on the central portion 3d and the inner peripheral surface of the case 2, and therefore, as shown by the arrows in FIG. Thus, a vertical force is applied.

  Further, at both end portions 3e of the insertion portion 3c, guide pieces 3h for guiding the insertion when the plate 3 is inserted into the gap between the case 2 and the reactor 1 are provided at the insertion ends of the both end portions. . The guide piece 3h is provided to be inclined from the reactor 1 side to the case 2 side toward the insertion end.

[3. Reactor mounting method]
Next, the attachment structure of the plate 3, the core 1a, and the case 2 will be described while showing the attachment procedure.

  With the reactor 1 inserted into the case 2, the plate 3 is inserted into the gap generated between the case 2 and the reactor 1. Specifically, the plate 3 is inserted while the guide pieces 3h provided at the insertion ends of the both end portions 3e of the interposing portion 3c in the plate 3 are applied to the upper end corner of the C-surface cut portion 1b of the core 1a.

  Here, although this guide piece 3h is inclined and provided from the reactor 1 side toward the case 2 side toward the insertion end, the plate 3 urges the reactor 1 in the absence of this. The insertion portion 3c has a more arcuate shape than the angle of the C-plane cut portion 1b and the side surface portion 1c, and the side portion both end portions 3e of the core 1a are inserted between the reactor 1 and the case 2 as they are. Then, both end portions 3e are caught on the upper portion of the core 1a. Therefore, the insertion of the plate 3 can be facilitated by providing the guide piece 3h as described above and inserting the plate 3 while applying the guide piece 3h to the upper end of the C-surface cut portion 1b of the core 1a.

[4. effect]
According to the present embodiment as described above, conventionally, only the side surface portion other than the C-cut surface of the core is pressed by the spring member, but the C-cut surface is urged by both end portions of the spring member. As a result, even if the spring member has the same reaction force, that is, the spring member having the same width, as shown in FIG. Therefore, the width of the gap provided between the side surface portion other than the C-cut surface of the core and the reactor case can be further reduced, space can be saved, and the entire reactor case can be reduced. it can.

  Further, as shown in the image diagram of FIG. 5A and the stress distribution situation of FIG. 5B, conventionally, the stress of the spring member is applied only to the side surface portion, and this stress reaches the inner peripheral surface of the core. In this embodiment, stress is concentrated on the corners of the inner peripheral surface of the core and causes cracks. However, in this embodiment, an image diagram of FIG. 3A and a stress distribution state of FIG. As shown in the figure, by urging the C-cut surface at both ends of the spring member, the stress can be dispersed and the stress is not concentrated on the corners of the core inner peripheral surface. Note that this stress distribution diagram is originally expressed in gradation by color, but for the sake of convenience of explanation, this is expressed as a simplified expression and the stress stages are expressed in three parts.

  Moreover, regardless of the inclination of the C-plane cut portion of the core, the load of the spring member is reduced by pressing the C-plane cut portion in the vertical direction against the inner peripheral surface of the reactor case with which the central portion of the spring member abuts. It is possible to avoid spreading and concentrating stress on the core without facing toward the center of the core.

  By providing a hole for adjusting the spring load at the center of the presser part, or at the center part or both end parts of the insertion part, the load of the spring member on the core can be freely adjusted.

  In the interposer, the guide piece is inclined from the reactor side to the reactor case side toward the insertion end, but when there is no guide piece, the plate urges the reactor. The part is more arcuate than the angle of the C-cut and side parts. Therefore, if both end portions of the side surface portion of the core are inserted as they are between the reactor and the reactor case, both end portions are caught on the upper portion of the core. Therefore, by providing a guide piece and inserting the plate while applying it to the upper end of the C-plane cut portion of the core, the plate can be easily inserted.

(2) Other Embodiments In the above-described embodiment, the material of the plate is not limited, and any known material can be used as appropriate within the range that can be assumed by those skilled in the art. For example, if the plate is made of a shape memory alloy and the plate is deformed at a high temperature, the plate can be thermally expanded at a high temperature, and a gap that cannot be absorbed in the above embodiment can be absorbed. Can be securely fixed to the case.

  As described at the beginning of the present embodiment, in the present embodiment, as an inclined surface of the side surface portion exposed from the coil in the core, only the C surface cut portion is illustrated and the embodiment thereof is shown. The present invention is not limited to this, and the present invention can also be applied to the U core outer side R portion whose side surface portion has an R shape.

The perspective view (a) and sectional drawing (b) which show the whole structure of the reactor and reactor case in embodiment of this invention. The perspective view (a) which shows the structure of the reactor and plate in embodiment of this invention, and the schematic diagram (b) which shows another plate shape. The image figure (a) which shows the load direction to the reactor in the reactor attachment structure in embodiment of this invention, and the figure (b) showing a stress distribution condition. The perspective view which shows the structure of the conventional reactor and plate. The image figure (a) which shows the load direction to the reactor in the conventional reactor mounting structure, and the figure (b) showing a stress distribution condition.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Reactor 1a ... Core 1b ... C surface cut part 1c ... Side surface part 1d ... Corner | angular part 11 ... Leaf spring 2 ... Case 2a, 2b ... Hole 3 ... Plate 3a ... Fixing part 3b ... Presser part 3c ... Insertion part 3d ... Center portion 3e ... Both end portions 3f, 3g ... Hole 3h ... Guide piece 4 ... Bolt

Claims (5)

By inserting a plate into a gap between the reactor case and the reactor inserted into the reactor case and corresponding to the side surface exposed from the coil in the core of the reactor, In the reactor fixing structure that fixes the reactor,
The plate includes a fixing portion fixed to the reactor case, a pressing portion for preventing the reactor from popping out, an insertion portion that is inserted into a gap between the reactor and the reactor case, and fills a gap between the reactor and the reactor case. With
The presser portion constitutes a spring member that fixes the reactor with respect to the insertion direction of the reactor to the reactor case,
The interposition portion is a substantially arcuate spring member along the side surface portion of the core, and is in contact with the inner peripheral surface of the reactor case at a central portion of the spring member, and at both end portions, the side surface of the core. The reactor fixing structure characterized by contacting the inclined surface inclined with respect to the inner peripheral surface of the reactor case among the parts.   The reactor fixing structure according to claim 1, wherein the holding portion includes a hole for adjusting a spring load at a center thereof.   The reactor fixing structure according to claim 1, wherein the insertion portion includes a hole for adjusting a spring load at a central portion or both end portions. In the both end portions of the interposition portion, when inserting the plate into the gap between the reactor case and the reactor, a guide piece that guides the insertion is provided at the insertion ends of the both end portions,
The reactor fixing structure according to any one of claims 1 to 3, wherein the guide piece is provided to be inclined from the reactor side to the reactor case side toward the insertion end.   Regardless of the inclination angle of the inclined surface, the both end portions of the interposition part press the inclined surface in the vertical direction against the inner peripheral surface of the reactor case with which the central portion of the spring member abuts. The reactor fixing structure according to any one of claims 1 to 4.

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