JP5668875B2 - Embedded fixing bracket - Google Patents

Description

  The present invention relates to an embedded fixing metal fitting that is embedded and fixed in a molded product such as a resin and screws other members or the like.

  An embedded fixing metal fitting, for example, an insert holder nut or the like, is known which is embedded and fixed in a molded product such as resin and screwed to other members. Some embedded fixing brackets have holes for embedding in the molded product and the embedded fixing brackets are embedded and fixed in the molded product by driving the embedded fixing brackets into the holes. Yes (Patent Documents 1 and 2). On the other hand, there is a type in which a resin or the like is poured around the embedded fixing bracket and is integrally formed with the molded product so that the embedded fixing bracket is embedded and fixed in the molded product. For example, in an electric vehicle (EV), it is used for a battery case made of a resin that houses a battery (see FIG. 1 described later), and a plurality of embedded fixing metal fittings are provided on the tray by integral molding. With this embedded fixing bracket, the cover of the battery case is fixed to the tray, and further, the tray is fixed to the cross member of the vehicle body.

Japanese Patent Laid-Open No. 5-126124 JP-A-56-141416

  With reference to FIG. 5 (a), (b), the structure of the conventional embedded fixing metal fitting used for integral molding and its problem are demonstrated. FIG. 5B is an enlarged view of the region E in FIG. Further, here, as an example, the tray 11, the cover 12 and the cross member 13 of the battery case 10 shown in FIG. 1 will be described as an example, and the same reference numerals are used.

  The embedded fixing metal fitting 51 is set in a mold when the tray 11 (resin molded product) of the battery case 10 is molded, and is integrally molded by injection molding of the resin in this state. As a result, the embedded fixing is performed. A metal fitting 51 is fixed to the protruding portion 11 a of the tray 11. A plurality of grooves 52 are formed in the embedded fixing metal fitting 51 to prevent it from coming off. Conventionally, an annular central portion of the embedded fixing metal fitting 51 is annularly formed in the circumferential direction. . In addition, female screws 53 are formed at both ends of the embedded fixing bracket 51, and the cover 12 of the battery case 10 is fixed to the cross member 13 by using the female screws 53. become.

  However, during injection molding, when the resin is poured, an air pool 54 may be generated in the groove 52 described above (see FIG. 5B). In such a case, the air reservoir 54 becomes an intrusion path for water and air from the outside of the battery case 10, so it is necessary to apply a sealing material or the like as a post-treatment, and the manufacturing effort is reduced. The cost is high. Incidentally, since the embedded fixture shown in Patent Document 1 is embedded and fixed in a molded product by driving, it is inevitable that a gap is generated. Therefore, the embedded fixing metal fitting shown in Patent Document 2 is provided with a seal member, but it takes time and effort to manufacture, and the cost becomes high.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an embedded fixing metal fitting that prevents the occurrence of an air pool when a resin is poured.

The embedded fixing bracket according to the first invention for solving the above-described problems is as follows.
An embedded fixing bracket embedded in a resin molded product molded by the resin mold while being held in the resin mold,
Forming at least one groove on the outer peripheral surface of the embedded fixture;
The longitudinal direction of the groove is inclined with respect to the axial direction (or circumferential direction) of the embedded fixture,
The depth of the groove is shallower from one axial side to the other side of the embedded fixture.

The embedded fixing bracket according to the second invention for solving the above-described problems is as follows.
In the embedded fixing metal fitting according to the first invention,
A bolt hole into which a bolt is inserted is formed at the end of the embedded fixing metal fitting.

  According to the present invention, a groove is formed on the outer periphery of the embedded fixing bracket, the longitudinal direction of the groove is inclined with respect to the axial direction (or circumferential direction) of the embedded fixing bracket, and the depth of the groove is set to resin. Since it is made smaller in the direction in which the air flows, it is possible to prevent the occurrence of air accumulation in the groove and to improve the sealing performance. As a result, it is not necessary to apply a sealing material, so that the manufacturing process is simplified and the cost can be reduced.

It is a perspective view which shows the battery case using the embedded fixation metal fitting which concerns on this invention. It is a figure which shows an example of embodiment of the embedded fixing metal fitting which concerns on this invention. (A) is an expanded view of the groove part of the embedded fixing metal fitting shown in FIG. 2, (b) is the BB arrow sectional drawing, (c) is the CC arrow view. It is sectional drawing. It is a figure explaining the injection molding in the embedded fixation metal fitting shown in FIG. (A) is sectional drawing explaining the structure of the conventional embedding fixing metal fitting, (b) is an enlarged view of the area | region E. FIG.

Hereinafter, with reference to FIGS. 1-4, embodiment of the embedded fixing metal fitting which concerns on this invention is described.
Here, as an example, the battery case shown in FIG. 1 will be described as an example. However, the battery case can be applied to other cases as long as the case protects the electrical components from intrusion of water or the like.

Example 1
FIG. 1 is a perspective view showing a battery case using the embedded fixture of the present embodiment. 2 is a view showing the embedded fixing metal fitting of the present embodiment, FIG. 3 (a) is a development view of the groove portion, and FIG. 3 (b) is a BB line of the groove portion. An arrow sectional view and Drawing 3 (c) are CC line arrow sectional views of a slot part. FIG. 4 is a view for explaining injection molding with the embedded fixing metal fitting shown in FIG. In FIGS. 2, 3A, and 4, the axial direction and the circumferential direction of the embedded fixture are shown for reference.

  First, a brief description will be given of a battery case using the embedded fixing metal fitting according to the present invention. In an electric vehicle (EV), a resin battery case 10 is used to accommodate and protect a battery. The battery case 10 is an electrical component such as a large number of batteries and cooling fans (both not shown). And a cover 12 that covers the upper portion of the tray 11 together with a large number of batteries and the like. A large number of embedded fixing brackets 21 are integrally formed with the tray 11 together with the tray 11, and the cover 12 is fixed to the tray 11 by the embedded fixing bracket 21. The embedded fixture 21 is also used to fix the battery case 10 to the cross member 13 on the vehicle body side.

  In the present embodiment, the embedded fixture 21 has screw portions made of female screws 23 (bolt holes into which bolts are inserted) at both ends thereof, as shown in FIG. By embedding the periphery with resin while being held in the molds 31 and 32), the periphery is embedded in the tray 11 (resin molded product) formed by the resin mold and integrally molded. The screw portion is not limited to a female screw, and may be a male screw or a combination of a female screw and a male screw.

  Three grooves 22 are formed on the outer peripheral surface of the embedded fixing bracket 21 to prevent it from coming off and preventing it from rotating. And in order to prevent generation | occurrence | production of an air pool, the longitudinal direction which is perpendicular | vertical with respect to the width direction of the groove | channel 22 is inclined with respect to the axial direction (or circumferential direction) of the embedded fixture 21, and The width and depth of the groove 22 are reduced toward the resin flow direction.

  The groove 22 formed on the outer peripheral surface of the embedded fixture 21 will be further described with reference to the developed view shown in FIG. 3A and the cross-sectional views shown in FIGS. 3B and 3C.

  If the outer peripheral surface of the embedded fixture 21 is a development view cut along the line AA, the shape shown in FIG. Each groove 22 is formed such that its longitudinal direction is inclined with respect to the axial direction (or circumferential direction) starting from the AA line side, and is linear in the developed view. As this inclination, for example, an angle of 30 ° to 60 ° is given to the axial direction. Then, as shown in FIG. 4 to be described later, when the resin used for injection molding is supplied from the lower side to the upper side in the drawing, the resin flows from the lower side to the upper side along the groove 22.

  In addition, the width and depth of each groove 22 are reduced from one side in the axial direction of the embedded fixture 21 toward the other side, that is, in the resin flow direction. For example, as shown in the cross-sectional views of FIG. 3B and FIG. 3C, the width W2 and the depth D2 in the CC line are W1> with respect to the width W1 and the depth D1 in the BB line. The relationship is W2, D1> D2, and the width is narrower and the depth is shallower in the resin flow direction (from one side to the other side in the axial direction of the embedded fixture 21). Then, the width and depth of each groove 22 finally disappears at the front end portion on the same surface as the outer peripheral surface of the embedded fixture 21.

  In the embedded fixture 21, the configuration of each groove 22 is also important in relation to the resin flow during injection molding, and this point will be described with reference to FIG. 4.

  The embedded fixture 21 is set between the lower mold 31 and the upper mold 32 when the tray 11 is molded. More specifically, it is inserted between the female screw 23 and is set between the lower holding pin 31a and the upper holding pin 32a for holding the embedded fixture 21. In this state, the tray 11 and the embedded fixture 21 are integrally formed by injection molding of resin. At the time of this injection molding, the resin is supplied from the lower side of the lower mold 31 and passes through the space at the bottom of the tray 11 to become a protruding portion 11a formed around the embedded fixture 21. It will flow into the space.

  As described above, the groove 22 formed on the outer peripheral surface of the embedded fixture 21 is inclined in the longitudinal direction, and further, the width and depth thereof are reduced toward the resin flow direction. Therefore, when the injection molded resin flows in, the resin flows in the direction of the arrow described in the groove 22. At this time, the resin flows into the groove 22 while pushing the air in the groove 22 upward, so that the outflow of the air in the groove 22 is promoted and the occurrence of air accumulation is prevented.

  In this way, the embedded fixture 21 is integrally molded with the tray 11 and fixed to the projecting portion 11a, and the sealing performance of that portion is improved. As a result, it is not necessary to apply a sealing material, so that the manufacturing process is simplified and the cost can be reduced. In addition, the groove 22 formed on the outer peripheral surface of the embedded fixing bracket 21 also functions as a stopper and a rotation stopper for the embedded fixing bracket 21.

  In addition, about the structure of the groove | channel 22 mentioned above, the number should just be at least one. Further, the length of each groove 22 in the longitudinal direction may be any length that makes at least one round of the outer peripheral surface of the embedded fixing fitting 21. However, the length is further increased so that each groove 22 has a spiral shape. You may arrange as follows. Here, the width and depth of each groove 22 are both reduced, but either one, for example, only the width or the depth may be reduced. In the developed view, the groove 22 is linear, but it may be curved.

  The present invention is suitable for a battery case of an electric vehicle, and can be applied to other cases as long as it is a case for protecting electrical components from intrusion of water or the like.

DESCRIPTION OF SYMBOLS 10 Battery case 11 Tray 11a Protruding part 21 Embedded fixing bracket 22 Groove 23 Female screw

Claims (2)

An embedded fixing bracket embedded in a resin molded product molded by the resin mold while being held in the resin mold,
Forming at least one groove on the outer peripheral surface of the embedded fixture;
The longitudinal direction of the groove is inclined with respect to the axial direction of the embedded fixture,
The depth of the groove is shallower from one side to the other side in the axial direction of the embedded fixing bracket. The embedded fixing bracket according to claim 1,
An embedded fixing bracket, wherein a bolt hole into which a bolt is inserted is formed at an end of the embedded fixing bracket.

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