JPH0564513U - Bonding structure between metal parts and resin parts - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent scratches on resin parts, facilitate mounting work, and reduce manufacturing costs. [Structure] A rectangular through hole 6 is provided in a resin bumper 1, a nut member 4 having a boss portion 4a that can be fitted in the through hole 6 so as to be prevented from rotating, and a metal panel 2 that is superposed on the resin bumper 1. Double screw member having a hexagonal bolt 3 that is inserted into the hole 2a of the hexagonal bolt, an outer screw portion 5b that is screwed into the female screw portion 4c of the nut member 4, and an inner screw portion 5a that is screwed into the screw portion 3a of the hexagonal bolt 3. 5, the hexagon bolt 3 is screwed in to pull in the nut member 4 via the double screw member 5, and the metal panel 2 is inserted between the hexagon bolt 3 and the outward flange portion 5c of the double screw member 5. While sandwiching the resin bumper 1 and the metal panel 2, the hexagon bolt 3 and the nut member 4
Join them by sandwiching them. One-sided work is possible, and an error in the thickness of the resin bumper 1 can be appropriately absorbed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a connecting structure between a metal part and a resin part, and more particularly, to a connecting structure between a metal part and a resin part, which both parts are connected by being sandwiched between a bolt member and a nut member.

[0002]

[Prior Art]

 For example, there is a bumper member of an automobile using a synthetic resin material. Conventionally, for example, a structure shown in FIG. 5 has been used as a structure for connecting the resin bumper 1 as the resin component to the automobile body. In this structure, the nut 11 is previously welded to the metal panel 2 which is a part of the body as the metal part, and the screw at the tip of the reduced diameter of the bolt 12 inserted into the through hole 6 provided in the resin bumper 1. The metal panel 2 is sandwiched between the nut 11 and the shoulder surface of the expanded body of the bolt 12 by screwing the portion of the resin bumper 1 between the head of the bolt 12 and the nut 11. And the metal panel 2 is sandwiched and connected.

However, in the structure described above, as shown in the figure, the head portion 12a of the metal bolt 12 is slidably contacted with the shoulder surface 6a of the through hole 6 of the resin bumper 1 having a two-step shape, and the resin bumper 1 In order to avoid scratching, it was necessary to interpose a washer member 13 between them. Therefore, the welding cost of the nut 11 and the washer member 13 are required, which causes a problem that the manufacturing cost increases.

Further, FIG. 6 shows a second conventional example, but in the structure thereof, a clip member 14 having a cylindrical shape is used. A female screw portion 14a is provided at one end portion of the clip member 14 in the axial direction, and an outward flange portion 14b outward in the radial direction is provided at the other end portion in the axial direction. In addition, a plurality of slits 14c cut along the axis are provided in an intermediate portion between the outward flange portion 14b and the female screw portion 14a of the clip member 14.

The connection procedure in the second embodiment will be shown below. The clip member 14 is inserted into the through hole 6 of the resin bumper 1 with the female screw portion 14a first, and the metal panel 2 is inserted between the outward flange portion 14b of the clip member 14 and the head portion 15a of the bolt 15. The end portion of the bolt 15 is screwed into the female screw portion 14a so that the bolt is clamped. Then, by further turning the bolt 15, the female screw portion 14a of the clip member 14 is pulled toward the outward flange portion 14b side, so that the middle portion of the clip member 14 is shown by a solid line from the state shown by the imaginary line in FIG. As shown in the drawing, the intermediate portion of the clip member 14 is pressed against the inner peripheral surface of the through hole 6 of the resin bumper 1. Therefore, the clip member 14 is prevented from coming off, and the resin bumper 1 and the metal panel 2 are integrated.

However, when the bolt 15 is turned, the clip member 14 must be prevented from co-rotating, a special tool for that purpose is required, and the position of the clip member 14 in the inserting direction is not regulated. However, there is a problem that the metal panel 2 is attached to the resin bumper 1 in a floating state.

[0007]

[Problems to be solved by the device]

 In view of the problems of the prior art, the main object of the present invention is to prevent the resin parts from being scratched, facilitate the mounting work, and reduce the manufacturing cost. To provide.

[0008]

[Means for Solving the Problems]

 According to the present invention, such an object is a connecting structure between a metal part and a resin part for sandwiching and connecting a metal part and a resin part between both members of a bolt member and a nut member. The nut member is on the side of the resin component and is prevented from rotating, and the bolt is an internal screw thread that is screwed from the metal component side to the nut member and to the nut member. It is achieved by providing a connecting structure between a metal part and a resin part, which is screwed to the nut member via a double screw member provided with a section. Particularly, it is preferable that the nut member is made of a synthetic resin material.

[0009]

[Action]

 In advance, the double screw member is screwed into the inner screw portion of the nut member and assembled, and, for example, the nut member is attached to the resin component in a state in which it is prevented from rotating, and the nut member in that state and the resin component and The bolt member is screwed into the inner screw portion of the double screw member so as to sandwich the metal part. Then, when the bolt member is turned in a direction to be screwed in, for example, when the metal part is sandwiched between the bolt member and the double screw member, the bolt member and the double screw member rotate together to prevent the nut from rotating. When the member is pulled in and the displacement of the nut member is stopped by the stopper means, the resin component and the metal component can be joined by being sandwiched between the bolt member and the nut member.

[0010]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is an exploded side sectional view showing a connecting structure of parts in a resin bumper for an automobile to which the present invention is applied. The resin bumper 1 is integrally joined to a metal panel 2 which is a part of an automobile body (not shown) to be integrated with the body. A hexagonal bolt 3 and a nut member 4 and a metal double screw member 5 interposed between the two are used for connecting the two.

The resin bumper 1 is formed with a rectangular through hole 6 penetrating in the thickness direction thereof, and an enlarged portion that is slightly widened is provided at the axially one end side portion of the through hole 6. .. The metal panel 2 is provided with a hole 2a capable of penetrating the screw portion 3a of the hexagon bolt 3 and having a smaller diameter than the head portion 3b.

The nut member 4 is made of a synthetic resin such as POM, and has a rectangular cross section that can be fitted into the through hole 6 so as to form a detent means in cooperation with the through hole 6. A boss portion 4a, and a rectangular outward flange portion 4b formed at the base end portion of the boss portion 4a so that it can be received in the enlarged portion of the through hole 6 and contact the shoulder surface 6a thereof, and A female screw portion 4c penetrating in the axial direction is provided. Further, as shown in FIG. 2, each of the four surfaces of the boss portion 4a is provided with a ridge portion 4d oriented along the axis. The double screw member 5 coaxially has an inner screw portion 5a and an outer screw portion 5b. The external threaded portion 5b can be screwed into the female threaded portion 4c of the nut member 4, and the threaded portion 3a of the hexagonal bolt 3 can be screwed into the internal threaded portion 5a. An outward flange portion 5c having a diameter slightly smaller than the inner diameter of the through hole 6 is provided at one end of the double screw member 5 in the axial direction.

Next, an assembling procedure based on the present invention will be shown below. As shown by the imaginary line in FIG. 1, the tip of the outer screw portion 5b of the double screw member 5 is screwed into a part of the female screw portion 4c of the nut member 4 in advance. At this time, for example, butyl rubber is interposed in the threaded portion between the nut member 4 and the double screw member 5, and both members 4 and 5 are temporarily fixed to each other, so that the nut member 4 and the double screw member 5 are joined together. Assemble in advance. The nut member 4 is mounted in the through hole 6 of the resin bumper 1 as shown in FIG. In this state, the tip portion of the boss portion 4a is slightly inserted into the through hole 6, but the above-mentioned protruding portions 4d provided on the four surfaces of the boss portion 4a are formed on the inner peripheral surface of the through hole 6. The nut member 4 is temporarily fixed by elastically pressing it.

Next, the threaded portion 3a of the hexagon bolt 3 is inserted into the hole 2a of the metal panel 2, and the metal panel 2 is placed on the surface of the resin bumper 1 opposite to the side on which the nut member 4 is mounted. The hexagon bolts 3 are screwed onto the inner threaded portions 5 a of the double screw member 5 so as to fit together.

Then, the hexagon bolt 3 is screwed into the double screw member 5 by turning the hexagon bolt 3 in a direction to be screwed in, and the head portion 3 b of the hexagon bolt 3 and the outward flange portion 5 c of the double screw member 5 are respectively provided. It comes into contact with both surfaces of the metal panel 2. By continuing to rotate the hexagon bolt 3 in this state, the double screw member 5 rotates together, and the nut member 4 in the rotation stopping state is pulled in.

When the outward flange portion 4 b of the pulled-in nut member 4 hits the shoulder surface of the enlarged portion 6 a of the through hole 6, the axial direction between the outer screw portion 5 b of the double screw member 5 and the nut member 4 is determined. A directional force is generated, the frictional force between the two becomes large, and the rotation of the double screw member 5 stops. Therefore, by further turning the hexagon bolt 3, the metal panel 2 can be firmly tightened by the head portion 3b of the hexagon bolt 3 and the outward flange portion 5c of the double screw member 5, and the hexagon bolt 3 and the nut member can be tightened. 4, the resin bumper 1 and the metal panel 2 can be firmly tightened. In order to improve the tightening torque control of the hexagon bolt, grease may be applied between the outward flange portion 5c of the double screw member 5 and the metal panel 2. In this way, the resin bumper 1 and the metal panel 2 can be integrally joined with an appropriate axial force.

According to the joint structure configured as described above, the resin bumper 1 and the metal panel 2 can be joined only by turning the hexagonal bolt 3 from one side as described above. It can be easily done by one-sided work. Further, since the double screw member 5 is inserted between the hexagon bolt 3 and the nut member 4 to be screwed in, the screwing depth of the hexagon bolt 3 and the nut member 4 with respect to the double screw member 5 is determined. Even if there is a large error in the thickness dimension of the resin bumper 1, the error can be appropriately absorbed.

Further, the conventional example shown in FIG. 6 has a problem that the holding force of the clip member changes depending on the accuracy of the through hole of the resin bumper, but according to the structure of the present invention, the hexagonal bolt 3 and Since the holding force is generated by the axial force between the nut member 4 and the nut member 4, the holding force is not affected by the accuracy of the hole as in the conventional example. Further, in the embodiment, the boss portion 4a of the nut member 4 is provided with the ridge portion 4d which exhibits a temporary fixing function when mounted in the through hole of the resin bumper 1 on the outer peripheral surface of the resin bumper 1. Work is made easier. Note that this temporary fixing function is not limited to the protrusion 4d of the embodiment, and a plurality of elastic anchor pieces extending obliquely outward from the outer peripheral surface of the boss 4a may be provided, for example.

[0019]

As described above, according to the present invention, the resin component and the metal component can be coupled by only screwing the bolt member by the one-sided work, and the coupling work can be easily performed. Further, since the double screw member is interposed between the bolt member and the nut member, the sandwiching interval between the bolt member and the nut member can be made variable, and the thickness dimension of the resin component is suitable. Acceptable.

[Brief description of drawings]

FIG. 1 is an exploded side sectional view showing a connecting structure of parts in an automotive resin bumper to which the present invention is applied.

FIG. 2 is a perspective view of a nut member according to the present invention.

FIG. 3 is a side sectional view showing a procedure for joining work.

FIG. 4 is a side sectional view showing a combined state.

FIG. 5 is a side sectional view showing a conventional coupling structure.

FIG. 6 is a side sectional view showing another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin bumper 2 Metal panel 2a Hole 3 Hexagon bolt 3a Screw part 3b Head part 4 Nut member 4a Boss part 4b Outward flange part 4c Screw part 4d Projection part 5 Double screw member 5a Inner screw part 5b Outer screw part 5c Outer flange Part 6 Through hole 6a Expanded part 6a Expanded part 11 Nut 12 Bolt 12a Head part 13 Washer member 14 Clip member 14a Female screw part 14b Outward flange part 14c Slit 15 Bolt 15a Head part

Claims (2)

[Scope of utility model registration request] 1. A joining structure between a metal component and a resin component for sandwiching and joining a metal component and a resin component between both members of a bolt member and a nut member, wherein the nut member is the resin component. , And the bolt is provided with an outer screw portion that is screwed into the nut member and an inner screw portion that is screwed into the bolt member from the side of the metal component. A coupling structure between a metal component and a resin component, which is screwed to the nut member via a thread member. 2. The joint structure between a metal component and a resin component according to claim 1, wherein the nut member is made of a synthetic resin material.