JP6319005B2 - Integrated molded product - Google Patents

Description

  The present invention relates to an integrally molded product.

  For example, Patent Document 1 describes a molded product in which a fiber reinforced resin composite material plate and a member made of a thermoplastic resin are integrated. Here, an opening is formed in the fiber reinforced resin composite material plate, and the fiber reinforced resin composite material plate and the thermoplastic resin are combined by filling the opening in a molten state. Yes.

JP 2010-46940 A

  By the way, the process of forming the opening in the fiber reinforced resin composite material plate is complicated and tends to be expensive. In particular, in order to integrally mold the resin member on the outer peripheral surface side of the pipe, when the member that forms the opening is a pipe, the opening is formed on the outer peripheral surface side of the pipe and penetrates to the inner peripheral surface. The process is likely to be complicated because it is necessary to avoid the problem.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an integrally molded product in which a resin member can be easily coupled to a pipe.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
The integrally molded product is a pipe, a fastening member that is inserted into a through-hole penetrating in the radial direction of the pipe and fastened to the pipe, and is molded by injection molding, and an outer peripheral surface of the pipe via the fastening member A resin member coupled to the pipe on the side, and the fastening member has an uneven surface on the surface that contacts the resin member.

  In the said structure, the fastening member is fastened by the pipe using the through-hole formed in the pipe. And the unevenness | corrugation is formed in the surface where a fastening member contacts a resin member. For this reason, a part of resin member is embedded in the recessed part of the fastening member among the surfaces which a resin member and a fastening member contact. Therefore, when the resin member is displaced so as to be pulled away from the pipe, a force for preventing the displacement is exerted by an anchor effect generated on a surface where the resin member and the fastening member are in contact with each other. Therefore, the resin member is firmly coupled to the pipe via the fastening member. In this case, the resin member can be injection-molded by arranging a mold near the outer peripheral side member. For this reason, the resin member can be easily coupled to the pipe.

The perspective view of the integrally molded product concerning 1st Embodiment. 2-2 sectional drawing of the integrally molded product concerning the embodiment. (A)-(d) is sectional drawing which shows the manufacturing process of the integrally molded article concerning the embodiment. Sectional drawing of the integrally molded product concerning 2nd Embodiment. 5-5 sectional drawing of the integrally molded product concerning the embodiment.

<First Embodiment>
Hereinafter, a first embodiment of an integrally molded product will be described with reference to the drawings.
As shown in FIG. 1, the integrally molded product 8 includes a pipe 10 having an inner peripheral surface 14 and an outer peripheral surface 12, and a resin bracket 20 coupled to the outer peripheral surface 12 side. Here, the pipe 10 is a cylindrical member made of aluminum. The resin bracket 20 is an injection-molded bracket.

  The integrally molded product 8 constitutes an instrument panel reinforcement of the vehicle. Specifically, the pipe 10 is disposed such that its axial direction is the vehicle width direction, and supports a shaft connected to the steering wheel. The resin bracket 20 is connected to an electronic control unit (ECU) whose control amount is an assist amount for assisting steering. Note that the ECU may be arranged at a position far away from the pipe 10 due to space restrictions when mounting the ECU on the vehicle. In this case, the actual resin bracket 20 has a shape extending from the pipe 10 to the location where the ECU is disposed. Here, for convenience, the resin bracket 20 is illustrated in a rectangular parallelepiped shape.

FIG. 2 is a sectional view taken along the line 2-2 in FIG.
As shown in FIG. 2, the pop stud 30 is inserted into the insertion hole 16 of the pipe 10, and the pop stud 30 is mechanically fastened to the pipe 10. The pop stud 30 includes an outer peripheral member 34 disposed on the outer peripheral surface 12 side of the pipe 10, an inner peripheral member 36 disposed on the inner peripheral surface 14 side of the pipe 10, an outer peripheral member 34 and an inner peripheral member. And an insertion member 32 for connecting 36. Here, the insertion member 32 is inserted into the insertion hole 16 penetrating between the outer peripheral surface 12 and the inner peripheral surface 14 of the pipe 10. The inner peripheral side member 36 includes a large diameter portion 36a having a diameter larger than that of the insertion hole 16, and a convex portion 36b extending inward in the radial direction of the pipe 10 with respect to the large diameter portion 36a. 36a covers the insertion hole 16 from the inner peripheral surface 14 side. On the other hand, the outer peripheral side member 34 includes a large-diameter portion 34a having a diameter larger than that of the insertion hole 16 and a convex portion 34b extending outward in the radial direction of the pipe 10 with respect to the large-diameter portion 34a. The insertion hole 16 is covered from the outer peripheral surface 12 side. A male screw 39 is formed in the large diameter portion 34a.

FIG. 3 shows a manufacturing process of the integrally molded product 8 according to the present embodiment.
FIG. 3A shows the time when the process of forming the insertion hole 16 in the pipe 10 is completed. Next, as shown in FIG. 3B, the pop stud 30 is fitted into the pipe 10 using the insertion hole 16. This step can be performed by fitting the pop stud 30 into the insertion hole 16 from the outer peripheral surface 12 side of the pipe 10 by a known technique. Next, as shown in FIG. 3C, the mold 40 is disposed on the outer peripheral surface 12 of the pipe 10 so as to cover the outer peripheral member 34. And as shown in FIG.3 (d), the injection molding of the resin bracket 20 is performed by pouring the thermoplastic resin which gave fluidity | liquidity by high temperature from the gate 42 of the metal mold | die 40. FIG.

Here, the operation of the present embodiment will be described.
As shown in FIG. 2 and the like, the outer peripheral side member 34 of the pop stud 30 is covered with the resin bracket 20 on the entire periphery. For this reason, even if it tries to displace the resin bracket 20 in any direction in the coupling surface S (surface stretched by the directions R and L and the directions F and B in FIG. 2) between the resin bracket 20 and the pipe 10, the displacement The outer peripheral side member 34 will be located ahead in the direction. For this reason, even if the resin bracket 20 is to be displaced in any of the above directions, the resin bracket 20 is exerted with a force from the pop stud 30 to prevent the displacement.

  A male screw 39 is formed on the convex portion 34 b of the outer peripheral side member 34. For this reason, as shown in the upper left part of FIG. 2 with an enlarged portion in the vicinity of the male screw 39, the convex portion 34b has an uneven shape on the contact surface in the L and R directions in the drawing between the resin bracket 20 and the convex portion 34b. doing. As a result, the specific portion P of the resin bracket 20 is embedded in the thread groove of the male screw 39 of the convex portion 34 b, and particularly contacts the male screw 39 on the radially outer side (direction U side) of the pipe 10. Therefore, when the resin bracket 20 is to be displaced outward in the radial direction of the pipe 10, a force is applied to the resin bracket 20 from the male screw 39 to prevent the displacement. That is, the male screw 39 has a shape that exhibits an anchor effect regarding the connection between the pop stud 30 and the resin bracket 20. The specific portion P can be an arbitrary portion sandwiched between the male screws 39 in the resin bracket 20.

  Further, in the step of performing injection molding, the insertion hole 16 is closed by the pop stud 30 as shown in FIG. For this reason, the thermoplastic resin used as the material of the resin bracket 20 does not flow to the inner peripheral surface 14 side of the pipe 10 through the insertion hole 16.

According to the present embodiment described above, the following effects can be obtained.
(1) The mold 40 was placed so as to cover the pop stud 30 and injection molding was performed. Thereby, the resin bracket 20 formed by injection molding can be easily coupled to the pipe 10. When the resin bracket 20 is formed on both the inner peripheral surface 14 side and the outer peripheral surface 12 side of the pipe 10 through the insertion hole 16 without using the pop stud 30, a mold is also provided on the inner peripheral surface 14 side. This will be difficult to do.

  (2) The pop stud 30 in which the external thread 39 is formed on the convex portion 34b of the outer peripheral member 34 is used as a fastening member. Thereby, even if it tries to displace the resin bracket 20 to the radial direction outer side of the pipe 10, the force which tries to prevent a displacement by the outer peripheral side member 34 is exerted by the anchor effect. For this reason, the resin bracket 20 and the pipe 10 can be firmly joined.

  (3) The entire circumference of the outer peripheral member 34 was covered with the resin bracket 20. Thereby, even if it tries to displace the resin bracket 20 in the arbitrary directions in the joint surface S (surface stretched by the directions F, B, R, and L in FIG. 2) between the resin bracket 20 and the pipe 10, the front in the displacement direction. A force for preventing displacement is exerted by the outer circumferential member 34 positioned at the position. For this reason, the resin bracket 20 and the pipe 10 can be firmly joined.

  (4) The pipe 10 was made of aluminum. In this case, if a metal bracket is used in place of the resin bracket 20 and the pipe 10 and the metal bracket are joined by welding, the strength of the pipe 10 is likely to be reduced by heat during welding. On the other hand, in this embodiment, the temperature of the pipe 10 when the pop stud 30 is fitted to the pipe 10 is lower than the temperature required by welding. Further, the heat applied to the pipe 10 in the injection molding process is smaller than the heat applied by welding. Therefore, in this embodiment, while using aluminum, integral molding with the resin bracket 20 is possible, suppressing the strength fall.

In addition, when the pipe 10 is made of aluminum and a resin bracket is used, it contributes to weight reduction of the instrument panel reinforcement.
<Second Embodiment>
Hereinafter, the second embodiment will be described with reference to the drawings with a focus on differences from the first embodiment.

  FIG. 4 shows a cross-sectional view of the integrally molded product 8 according to the present embodiment. The cross-sectional view shown in FIG. 4 corresponds to the cross-sectional view shown in FIG. In the present embodiment, members corresponding to those in the first embodiment are denoted by the same reference numerals for convenience.

  As illustrated, in the present embodiment, a pop nut 50 is fastened to the pipe 10 using the insertion hole 16. The pop nut 50 connects the outer peripheral member 54 disposed on the outer peripheral surface 12 side, the inner peripheral member 56 disposed on the inner peripheral surface 14 side, the outer peripheral member 54 and the inner peripheral member 56. And an insertion member 52 to be inserted into the insertion hole 16.

  A hole 57 reaching the inner peripheral side member 56 via the insertion member 52 is formed in the surface of the outer peripheral side member 54 located on the radially outer side of the pipe 10. A female screw 59 is formed on the inner peripheral surface that defines the hole 57 in the inner peripheral member 56 of the pop nut 50. A part of the resin bracket 20 is embedded in the hole 57.

FIG. 5 shows a 5-5 cross section of FIG.
Here, the operation of the present embodiment will be described.
As shown in FIGS. 4 and 5, the entire circumference of the outer peripheral side member 54 of the pop nut 50 is covered with the resin bracket 20. A part of the resin bracket 20 is also embedded in the hole 57 of the pop nut 50. For this reason, if it is going to displace the resin bracket 20 in the arbitrary directions in the joint surface S (surface stretched by the directions L, R, F, and B) of the resin bracket 20 and the pipe 10, it is positioned forward in the displacement direction. A force is applied from the outer peripheral side member 54 to prevent displacement.

  As shown in FIGS. 4 and 5, a hole 57 is formed in the pop nut 50, a female screw 59 is formed on the inner peripheral surface of the inner peripheral member 56 that defines the hole 57, and a resin is formed in the hole 57. A part of the bracket 20 is embedded. Therefore, a part of the resin bracket 20 is embedded in the thread groove of the female screw 59. Accordingly, when the resin bracket 20 is to be displaced outward in the radial direction of the pipe 10, a force for preventing the displacement is exerted by the female screw 59. That is, the internal thread 59 has a shape that exhibits an anchor effect with respect to the connection between the pop nut 50 and the resin bracket 20.

<Other embodiments>
Each of the above embodiments may be modified as follows.
・ "Resin member (resin bracket 20) joining method"
In the first embodiment, it is not essential that the entire circumference of the outer peripheral side member 34 of the pop stud 30 is covered with the resin bracket 20. For example, the large diameter portion 34a may be partially exposed. Even in this case, when the resin bracket 20 is to be displaced in an arbitrary direction within the coupling surface S, a force for preventing the displacement is exerted on the resin bracket 20 by the convex portion 34b. Similarly, it is not essential that the entire circumference of the outer peripheral side member 54 of the pop nut 50 is covered with the resin bracket 20 in the second embodiment.

  In the second embodiment, a hole that reaches the inner peripheral member 56 from the outer peripheral member 54 via the insertion member 52 is formed, and the female screw 59 is provided on the inner peripheral surface that defines the hole in the inner peripheral member 56. Although formed, it is not restricted to this. For example, an internal thread may be formed on the entire inner peripheral surface defining the hole among the outer peripheral side member 54, the insertion member 52, and the inner peripheral side member 56, and the hole of the insertion member 52 and the inner peripheral side member 56 may be formed. An internal thread may be formed on the entire surface of only the inner peripheral surface that divides. Further, for example, a hole may be formed only in the outer peripheral side member 54 and the insertion member 52, and a female screw may be formed on the inner peripheral surface defining the hole. Further, for example, a hole may be formed only in the outer peripheral side member 54 and a female screw may be formed on the inner peripheral surface that defines the hole.

Moreover, not only a screw | thread but the unevenness | corrugation should just be formed in the surface which contacts a resin member among fastening members.
As what pinches | interposes a part of resin bracket 20, it is not restricted to either a male screw or a female screw. For example, what has both a male screw and a female screw as a fastening member is employ | adopted, and a part of resin bracket 20 may be pinched | interposed by both of them. For example, in the second embodiment, a male screw is formed on the outer peripheral surface of the outer peripheral member 54, or a hole is formed in the outer peripheral member 34 in the first embodiment, and a female screw is formed on the inner periphery defining the hole. It can be realized by forming.

・ About pipes
It is not limited to those made of aluminum. For example, other metals such as iron may be used. However, it is not limited to metals.

·"others"
In each of the above embodiments, the insertion hole 16 is blocked by the pop stud 30 and the pop nut 50, so that the thermoplastic resin does not flow to the inner peripheral surface 14 side of the pipe 10 through the insertion hole 16. However, it is not limited to this. If the pressure of the resin at the time of injection molding is high and there is a concern that the resin may flow to the inner peripheral surface 14 side of the pipe 10 through the insertion hole 16, a separate sealing member may be provided.

  In each of the above embodiments, only the portion where the single resin bracket 20 is coupled to the pipe 10 is described as the instrument panel reinforcement, but the number of the resin brackets 20 coupled to the pipe 10 is not limited to one. At this time, the ECU connected to the resin bracket 20 may be, for example, an ECU that controls the control amount of the engine in addition to the ECU having the assist amount exemplified in the above embodiment as a control amount. However, it is not essential to add an ECU having the assist amount as a control amount as a connection target to the resin bracket 20. Furthermore, the connection target to the resin bracket 20 is not limited to the ECU. For example, a part of an air conditioner or an air bag may be used.

  The integrally molded product is not limited to that applied to the instrument panel reinforcement.

  P: specific location, S: coupling surface, 8: integrally molded product, 10: pipe, 12: outer peripheral surface, 14 ... inner peripheral surface, 16 ... insertion hole, 20 ... resin bracket, 30 ... pop stud, 32 ... insertion member , 34 ... outer peripheral side member, 34a ... large diameter part, 34b ... convex part, 36 ... inner peripheral side member, 36a ... large diameter part, 36b ... convex part, 39 ... male screw, 40 ... mold, 42 ... gate, 50 ... Pop nut, 52 ... Insert member, 54 ... Outer peripheral member, 56 ... Inner peripheral member, 57 ... Hole, 59 ... Female screw.

Claims (1)

Pipes,
A fastening member that is inserted into a through-hole penetrating in the radial direction of the pipe and fastened to the pipe while closing the through-hole ;
A resin member molded by injection molding and coupled to the pipe on the outer peripheral surface side of the pipe via the fastening member,
The fastening member is an integrally molded product in which irregularities are formed on a surface that contacts the resin member.