JPS6338713A - Part mounting structure to hollow member - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a structure for attaching components to a hollow member formed with a constant closed cross section.

[Prior Art] Conventionally, as a general means for attaching a functional component to a mounting surface of an aluminum hollow member formed on a fixed joint surface, for example, the method shown in FIGS. 5 and 6 is known. ing.

That is, when the inner diameter of the hollow member 101 is large to ensure a working space as shown in FIG. 5, the bolt 1 is inserted from the inner space side.
03 and screwing the nut 105 into the threaded portion of the bolt 103 that has passed through the bolt 103, it becomes possible to fasten the bracket 107 for mounting the functional component. However, as shown in FIG. 6, if the inner diameter of the hollow member 101 is small and it is difficult to secure a working space, attachment using bolts and nuts will not be possible. Therefore, a method is adopted in which the bracket 107 is fixed to the mounting surface of the hollow member 101 using blind rivets 109.

[Problems to be Solved by the Invention] As described above, the bracket 107 for mounting the functional component is attached to the mounting surface of the hollow member 101 via the blind rivet 109.
In the structure where bolts 103 and nuts 1 are fastened,
The fastening strength is lower than that of a structure that uses 05 to fasten.
There was a problem with reliability.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a structure for attaching components to a hollow member that can provide reliable fastening strength in a hollow member whose inner diameter is small and it is difficult to secure a working space.

[Means for Solving the Problems] In this invention for achieving the above object, an internal space is provided in an internal space of a longitudinally continuous hollow member having a through hole bored in the mounting surface. A retainer inscribed in the inner wall surface and slidable in the longitudinal direction is disposed, and the retainer has a
A nut is fixedly engaged with the threaded portion of the fastening bolt inserted through the through hole.

[Operation J] In such a structure, the retainer is slid into the internal space of the hollow member to align the nut with the through hole. Next, after aligning the functional component with the mounting surface, a fastening bolt is inserted and the threaded portion is screwed into the nut. As a result, attachment using bolts and nuts can be performed, and a reliable fastened state can be obtained.

[Example] Hereinafter, a detailed explanation will be given based on an example implemented in a rear step bumper.

In FIG. 3, 1 indicates an aluminum rear step bumper.

The rear step bumper 1 consists of a step body 5 on which a step surface 3 is formed along the inside direction of the vehicle, and side bumpers 9, which are connected to both sides of the body 5 via overriders 7, 7. .

The step body 5 includes a vertical portion 13 fixed to a strength member (not shown) of the vehicle body 11, and inner and outer hollow members 15 and 17 that are continuous with the vertical portion 13 and whose upper surfaces form the step surface 3. The inner hollow cross section is formed in a rectangular shape, and the outer hollow cross section is formed in a fan shape, and both the hollow members 15 and 17 function as reinforcing members for the step surface 3.

An overrider 7 integral with the side bumper 9 is fastened to both sides of the fan-shaped hollow member 15 by fastening bolts 19 and nuts 21.

That is, a longitudinal mounting surface 23 is formed in the fan-shaped curved portion, and a through hole 25 is bored in the mounting surface 23. On the other hand, a retainer 27 made of a spring that is slidable along the longitudinal direction is fitted into the internal space, and the retainer 27
The nut 21 is fixed by welding.

The retainer 27 is formed along the inner wall surface serving as the mounting surface 23, and has folded pieces 29 and 31 on both ends, and stoppers 33 on the edges of the retainer body.

The folded pieces 29 and 31 contact the vertical inner wall surface 15a and the horizontal inner wall surface 15b of the internal space, respectively, so that the retainer 27
movement perpendicular to the longitudinal direction is restricted.

In addition, in an embodiment in which the hollow member 15 has an independent shape as shown in FIG. It becomes a shape that is inscribed with . Therefore, one folded piece 29 comes into contact with the inner wall surface 15C facing the mounting surface 23, and the other folded piece 31 comes into contact with the inclined inner wall surface 15d continuous with the inner wall surface 15c.

On the other hand, the stopper 33 has a function of positioning the nut 21 with respect to the through hole 25 by coming into contact with the edge of the step body 5.

That is, the dimension from the stopper 33 to the nut 21 and the dimension from the edge of the step body 5 to the through hole 25 are set to be the same, and by inserting the retainer 27 into the internal space until it hits the stopper 33, the nut 21 is It is set at a position facing the through hole 25.

In order to attach the overrider 7 to both ends of the hollow member 15 configured as described above, the retainer 33 is first inserted into the internal space until the stopper 33 touches the edge of the step body 5. At this time, the nut 21 is placed in a standby state by the stopper 33 at a position facing the through hole 25. Further, the folded pieces 29 and 31 are in contact with the vertical inner wall surface 15a and the horizontal inner wall surface 15b, respectively, and movement perpendicular to the longitudinal direction is restricted.

Next, after aligning the mounting plate 7a of the overrider 7 with the through hole 25 on the mounting surface 23, the fastening bolt 19 is inserted and the threaded portion 19a is screwed into the nut 21. As a result, the overrider 7 is fastened with the bolt 19 and the nut 21, and as a result, reliable installation can be achieved.

[Effects of the Invention] As explained above, according to the structure for attaching parts to hollow members of the present invention, nuts can be set using a retainer even in hollow members such as aluminum with a small inner diameter where it is difficult to secure a working space. This makes it possible to install using fastening bolts. Therefore, a reliable fastened state can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view taken along the line I-I in Fig. 3 showing an example of a structure for attaching parts to a hollow member according to the present invention, Fig. 2 is an exploded perspective view of the same, and Fig. 3 is a rear step bumper according to the present invention. Fig. 4 is an exploded perspective view similar to Fig. 2 showing a modified example of the hollow member, Fig. 5 is a perspective view showing a conventional example, and Fig. 6 shows a conventional example. A perspective view similar to FIG. 6,
FIG. 7 is a sectional view taken along the line VN-Vl in FIG. 6. Explanation of main drawing symbols 15... Hollow member 19... Fastening bolt 21... Nut 23... Mounting surface 25... Through hole 27... Retainer agent Patent attorney Yasuo Miyoshi 15- Hollow member 19 - 8M bolt 21 - Nut 23 - Mounting surface 25 - Through hole 27 - Retainer Fig. 1/Fig. 2

Claims (1)

[Claims] A retainer inscribed in the inner wall surface of the internal space and slidable in the longitudinal direction is disposed in an internal space of a longitudinally continuous hollow member having a through hole bored in the mounting surface, and the retainer includes: A structure for attaching components to a hollow member, characterized in that a nut is fixed to be engaged with a threaded portion of a fastening bolt inserted through the through hole.