JP6197732B2 - Bracket mounting structure and resin molding - Google Patents

Description

  The present invention relates to a mounting structure for attaching a bracket to a boss formed on a base member made of a resin material, and a resin molded body.

  10 and 11 of Patent Document 1 disclose a structure in which a connector mounting bracket is attached to a base member. That is, the bracket is attached to the boss by inserting the bolt into the insertion hole of the bracket and screwing the bolt into the female screw of the base portion (hereinafter referred to as a boss) protruding from the base member. In this mounting structure, a flat engagement surface is formed on the side surface of the boss, and the bracket engagement piece abuts against the engagement surface, thereby restricting the rotation of the bracket around the bolt. Has been.

  In addition, in the bracket mounting structure disclosed in FIGS. 1 to 3 of Patent Document 1, the end of the engagement piece of the bracket is inserted into the concave groove formed in the base member, so that the bolt is centered. The rotation of the bracket is restricted.

  The base member described in Patent Document 1 is made of aluminum.

JP 2009-224040 A

  By the way, when a bracket is attached to a base member made of a resin material, the following problems arise when the structure described in FIGS. That is, by forming the engagement surface on the side surface of the boss, at least the thickness of the engagement surface side of the boss is increased. For this reason, when a base member having a boss is molded from a resin material, there is a risk of molding shrinkage of the resin, so-called sink, and it is difficult to increase the dimensional accuracy of the boss. Furthermore, if the distance from the insertion hole of the bracket to the engagement piece becomes longer due to restrictions on the shape of the bracket, etc., the distance from the female thread of the boss to the engagement surface will increase, and the physique of the boss will increase and the amount of resin material used will increase. There arises a problem that increases.

  Further, when the structure described in FIGS. 1 to 3 of Patent Document 1 is employed, the following problems occur. That is, in order to form the concave groove, it is necessary to partially increase the thickness of the portion corresponding to the concave groove of the base member, or to increase the thickness of the base member as a whole.

  An object of the present invention is to provide a bracket mounting structure and a resin molded body capable of suppressing an increase in the amount of resin material used and restricting the rotation of the bracket even when the shape of the bracket is limited. Is to provide.

The bracket mounting structure for achieving the above object is the same by providing a female screw on a boss formed on a base member made of a resin material, inserting a bolt into the insertion hole of the bracket, and screwing the bolt into the female screw. The bracket is attached to the boss, and the bracket is made of a plate material, and has a flat plate portion in which the insertion hole is formed, and a bent portion that is bent from one end of the flat plate portion and extends toward the base member side. The base member is integrally formed with a flat plate-shaped restricting projection spaced from the boss so as to restrict the rotation of the bracket around the bolt by contacting the bent portion. Yes.

Further, a resin molded body for achieving the above object is integrally formed with the base member at a position separated from the boss formed with a base member made of a resin material, the boss formed on the base member and having an internal thread, e Bei and a plate-shaped regulating projection for regulating the rotation of the bracket by contact with the bracket attached by screwing a bolt into the internal thread, the bracket is made of sheet material, the insertion hole is formed A flat plate portion and a bent portion that is bent from one end of the flat plate portion and extends toward the base member, and is attached to the boss by screwing a bolt inserted into the insertion hole into the female screw. And the restricting projection comes into contact with the bent portion .

According to this configuration, rotation of the bracket around the bolt is restricted by the bracket being brought into contact with the restriction protrusion.
In addition, since the restricting protrusion can be formed independently of the boss, the resin can be used even when the distance from the insertion hole of the bracket to the contact portion is increased due to restrictions on the shape of the bracket. The amount of material used will not increase.

  Further, since the shape of the boss can be set independently of the restricting projection, it is possible to avoid a partial increase in the thickness of the boss by making the boss cylindrical. For this reason, generation | occurrence | production shrinkage | contraction of resin, what is called sink, can be suppressed, and the dimensional accuracy of a boss | hub can be improved.

  According to the present invention, even when the shape of the bracket is restricted, an increase in the amount of resin material used can be suppressed and the rotation of the bracket can be restricted.

The side view which shows the attachment structure of the bracket which concerns on 1st Embodiment. (A) is an exploded perspective view showing the cylinder head cover, bracket, and bolt of the embodiment in an exploded state, and (b) is a perspective view showing a state in which the cylinder head cover, bracket, and bolt of the embodiment are assembled. Sectional drawing along the 3-3 line of FIG.2 (b). (A) is a disassembled perspective view showing the cylinder head cover, bracket and bolt of the second embodiment in an exploded manner, and (b) is a perspective view showing a state in which the cylinder head, bracket and bolt of the embodiment are assembled. Sectional drawing along line 5-5 in FIG.4 (b). The perspective view which shows the attachment structure of the bracket of a modification. Sectional drawing along line 7-7 in FIG. The perspective view of the cylinder head cover which concerns on another modification. Sectional drawing which shows the attachment structure of the bracket of a 1st comparative example. (A) is a disassembled perspective view which shows the cylinder head cover of a 2nd comparative example, (b) is a perspective view which shows the attachment structure of the bracket of the comparative example. Sectional drawing which shows the attachment structure of the bracket which concerns on another modification. Sectional drawing which shows the attachment structure of the bracket which concerns on another modification.

<First Embodiment>
The first embodiment will be described below with reference to FIGS.
A main body (hereinafter referred to as a cover main body 12) of the cylinder head cover 10 of the internal combustion engine shown in FIG. 1 is formed of a heat-resistant resin material, and as shown in FIGS. The boss 14 having a cylindrical shape is integrally formed. As shown in FIGS. 2A and 3, a metal nut 18 is fixed to the hole 16 of the boss 14. The nut 18 is fixed to the hole 16 by insert molding or press-fitting the heated nut 18 to the boss 14.

  As shown in FIGS. 1 to 3, a flat plate-like restricting protrusion 40 is integrally formed on the upper surface of the cover body 12 at a position spaced from the boss 14. The restriction projection 40 has a restriction surface 42 that faces the boss 14. The position of the top surface of the boss 14 in the vertical direction is substantially the same as the position of the tip surface of the restricting protrusion 40.

  A bracket 30 formed by pressing a metal plate material is attached to the nut 18. The bracket 30 includes a flat plate portion 32 in which an insertion hole 33 is formed, a first bent portion 34 that is bent from one end of the flat plate portion 32 and extends toward the cover body 12, and is bent from the other end of the flat plate portion 32. The second bent portion 36 extends toward the opposite side of the cover body 12. The second bent portion 36 is illustrated only in FIG. Then, in a state where the first bent portion 34 of the bracket 30 is in contact with the regulation surface 42, the bolt 30 is inserted into the insertion hole 33 of the bracket 30 and the bolt 20 is screwed into the nut 18. It is attached to the boss 14. As shown in FIG. 1, a C-shaped holding member 38 is supported in a hole (not shown) at the tip of the second bent portion 36, and the wire harness 22 is held by the holding member 38. .

Next, the operation of this embodiment will be described.
In the mounting structure of the bracket 430 of the first comparative example shown in FIG. 9, the tip of the bent portion 434 of the bracket 430 is inserted into the recessed groove 450 formed in the cover body 412, so that the bolt 420 is the center. The rotation of the bracket 430 is restricted. That is, in the mounting structure of the first comparative example, in order to form the concave groove 450, the thickness of the portion corresponding to the concave groove 450 of the cover body 412 is partially increased as shown by the solid line in FIG. Alternatively, it is necessary to increase the overall thickness of the cover body 412 as indicated by a two-dot chain line in FIG.

  On the other hand, in the mounting structure of the bracket 30 of the present embodiment, the restriction protrusion 40 that restricts the rotation of the bracket 30 around the bolt 20 is provided to protrude from the upper surface of the cover body 12. Unlike the first comparative example, it is not necessary to increase the thickness of the cover body 12.

  Further, in the mounting structure of the bracket 530 of the second comparative example shown in FIG. 10B, a flat restricting surface 515 is formed on the side surface of the boss 514, and the bent portion 534 of the bracket 530 contacts the restricting surface 515. As a result, the rotation of the bracket 530 around the bolt 520 is restricted. However, in the mounting structure of the second comparative example, as shown in FIG. 10A, the thickness of the boss 514 on the regulating surface 515 side is thick. For this reason, when the cover body 512 having the boss is molded from a resin material, there is a risk of molding shrinkage of the resin, so-called sink, and it is difficult to increase the dimensional accuracy of the boss 514. Further, when the distance from the insertion hole (not shown) of the bracket 530 to the bent portion 534 is increased due to restrictions on the shape of the bracket 530, the distance from the nut 518 of the boss 514 to the restriction surface 515 is increased, and the physique of the boss 514 is increased. As a result, the problem arises that the amount of resin material used increases.

  On the other hand, in the bracket 30 mounting structure of the present embodiment, since the restricting protrusion 40 is formed independently of the boss 14, the distance from the insertion hole 33 of the bracket 30 to the first bent portion 34 is small. Even when the length is increased, the amount of resin material used does not increase.

  Further, since the shape of the boss 14 can be set independently of the restricting protrusion 40, it is possible to avoid a partial increase in the thickness of the boss 14. For this reason, generation | occurrence | production shrinkage | contraction of resin can be suppressed and the dimensional accuracy of the boss | hub 14 can be improved.

According to the mounting structure of the bracket 30 and the cylinder head cover 10 according to the present embodiment described above, the following effects can be obtained.
(1) On the cover body 12 of the cylinder head cover 10, a regulation protrusion 40 that regulates the rotation of the bracket 30 around the bolt 20 by being in contact with the bracket 30 is integrally formed at a position away from the boss 14. ing.

According to such a configuration, rotation of the bracket 30 is restricted when the bracket 30 is brought into contact with the restriction protrusion 40. For this reason, it is not necessary to increase the thickness of the cover main body 12.
Further, since the restricting protrusion 40 is formed independently of the boss 14, the insertion hole 33 of the bracket 30 and the first bent portion 34 abutting against the restricting protrusion 40 due to restrictions on the shape of the bracket 30 and the like. Even when the interval is increased, the amount of the resin material used does not increase.

  Moreover, since it becomes possible to set the shape of the boss | hub 14 independently, it can avoid that the thickness of the boss | hub 14 increases. For this reason, it is possible to suppress the occurrence of molding shrinkage of the resin, so-called sink.

  Therefore, even when the shape of the bracket 30 is restricted, an increase in the thickness of the cover main body 12 and the amount of resin material used can be suppressed and the rotation of the bracket 30 can be restricted.

(2) The bracket 30 has a first bent portion 34 that comes into contact with a restriction surface 42 that faces the boss 14 of the restriction protrusion 40.
According to such a configuration, since the first bent portion 34 of the bracket 30 is located between the boss 14 and the restricting protrusion 40, the bracket 30 extends to the opposite side of the boss 14 from the restricting protrusion 40 and is enlarged. Can be avoided.

Further, the rotation of the bracket 30 can be suitably restricted by the surface contact between the restriction surface 42 and the first bent portion 34.
(3) The first bent portion 34 of the bracket 30 extends toward the cover body 12 side. For this reason, when it is difficult to extend the first bent portion 34 of the bracket 30 to the side away from the cover main body 12 due to the layout above the cover main body 12, the first bent portion 34 is brought into contact with the restricting protrusion 40. By doing so, the rotation of the bracket 30 can be regulated appropriately.

Second Embodiment
Hereinafter, with reference to FIG. 4 and FIG. 5, the second embodiment will be described focusing on differences from the first embodiment.

As shown in FIGS. 4A, 4 </ b> B, and 5, in the present embodiment, the position of the front end surface of the restriction projection 140 in the vertical direction is higher than the position of the top surface of the boss 114.
Further, the bent portion 134 of the bracket 130 extends toward the distal end side of the restricting protrusion 140, that is, the side away from the upper surface of the cover main body 12.

Next, the operation of this embodiment will be described.
In the mounting structure of the bracket 130 of this embodiment, the bent portion 134 of the bracket 130 is brought into contact with the restriction surface 142 of the restriction protrusion 140, whereby the rotation of the bracket 130 around the bolt 120 is restricted.

According to the bracket mounting structure and the resin molded body according to the present embodiment described above, the following effects are newly obtained in addition to the effects (1) and (2) of the first embodiment. .
(4) The bent portion 134 extends toward the distal end side of the restricting protrusion 140. Therefore, even if it is difficult to extend the bent portion of the bracket to the cover main body 112 side because the height from the upper surface of the cover main body 112 to the top surface of the boss 114 is low, the bent portion 134 is moved to the tip of the restricting protrusion 140. The bent portion 134 can be brought into contact with the restricting protrusion 140 by extending to the side. Accordingly, even when the height from the upper surface of the cover main body 112 to the top surface of the boss 114 is low, the rotation of the bracket 130 around the bolt 120 can be restricted.

<Modification>
In addition, the said embodiment can also be changed as follows, for example.
In the first embodiment, the position of the tip surface of the restricting protrusion 40 can be set lower than the position of the top surface of the boss 14. In this case, it is possible to reduce the amount of resin material used to form the restricting protrusions compared to the first embodiment.

  As shown in FIGS. 6 and 7, the bent portion 234 of the bracket 230 may be brought into contact with the regulating surface 242 on the opposite side to the surface facing the boss 214 of the regulating projection 240. Even in this case, when the bent portion 234 of the bracket 230 is brought into contact with the restriction surface 242 of the restriction protrusion 240, the rotation of the bracket 230 around the bolt 220 is restricted.

  -Two or more restricting protrusions can be formed on the cover body. For example, as shown in FIG. 8, if two restricting projections 340 are formed at positions spaced from the boss 314 on the upper surface of the cover main body 312, an amount corresponding to the gap 344 formed between each of the restricting projections 340. The resin material can be reduced.

  -A bracket is not limited to what has a bending part contact | abutted to a control protrusion. That is, as shown in FIG. 11, the end of the flat plate portion 632 of the bracket 630 may be brought into contact with the restriction surface 642 of the restriction protrusion 640.

  In the above-described embodiment, the boss and the restricting projection are illustrated as being formed on the upper surface of the cover body having a flat plate shape, that is, on the same plane. For example, as shown in FIG. Can also be formed on different surfaces 712a, 712b of the cover body 712.

  -This invention can also be applied with respect to other resin moldings, such as an intake manifold of an internal combustion engine.

  DESCRIPTION OF SYMBOLS 10 ... Cylinder head cover (resin molding), 12, 112, 212, 312, 412, 512, 612, 712 ... Cover main body (base member), 14, 114, 214, 314, 414, 514, 614, 714 ... Boss , 16, 116, 216, 416 ... holes, 118, 218, 418, 518, 618, 718 ... nuts, 20, 120, 220, 420, 620, 720 ... bolts, 22 ... wire harnesses, 30, 130, 230, 430, 530, 630, 730 ... bracket, 32, 132, 232, 632, 732 ... flat plate portion, 33, 133, 233, 533 ... insertion hole, 34 ... first bent portion (contact portion), 36 ... Second bent portion, 38 ... holding member, 40, 140, 240, 340, 640, 740 ... regulating protrusion, 42, 142, 242, 642 Regulating surface, 134,234,734 ... bent portion (contact portion), 344 ... gap, 434 ... bent portion 450 ... recessed groove, 515 ... restricting surface, 534 ... bend.

Claims (3)

A structure in which a female screw is provided on a boss formed on a base member made of a resin material, a bolt is inserted into an insertion hole of the bracket and a bolt is screwed into the female screw to attach the bracket to the boss,
The bracket is made of a plate material, and has a flat plate portion in which the insertion hole is formed, and a bent portion that is bent from one end of the flat plate portion and extends toward the base member side,
The base member is integrally formed with a flat plate-like restricting projection that is spaced from the boss by restricting the rotation of the bracket around the bolt by contacting the bent portion .
Bracket mounting structure. The bent portion, it abuts the surface facing the boss of the regulating projection,
The bracket mounting structure according to claim 1. A base member made of a resin material;
A boss formed on the base member and having an internal thread;
Is integrally molded to the base member in a position spaced from said boss, eh Bei a, a flat regulating projection for regulating the rotation of the bracket by contact with the bracket attached by screwing a bolt into the internal thread ,
The bracket is made of a plate material, has a flat plate portion in which an insertion hole is formed, and a bent portion that is bent from one end of the flat plate portion and extends toward the base member side, and a bolt inserted into the insertion hole. It is attached to the boss by screwing into the female screw,
The restricting protrusion is in contact with the bent portion;
Resin molded body.