JPS61169350A - Connecting structure between bumper main and bumper side - Google Patents

Abstract

PURPOSE:To avoid the stress concentration due to the expansion and shrinkage of a bumper main by forming truncated cone-like boss sections and taper holes on flanges of individual connecting ends of the bumper main and a bumper side. CONSTITUTION:Truncated cone-like boss sections 10 are protruded on the upper and lower sections of a flange 3 face integrally molded on the connecting end 1a of a bumper main 1. On the other hand, taper holes 11 for containing the boss sections 10 are formed on a flange 4 integrally molded on the connecting end 2a of a bumper side 2. These boss sections 10 and taper holes 11 are coupled to connect the bumper main 1 and bumper side 2.

Description

[Detailed description of the invention] Industrial applications The present invention relates to automobile bumpers, especially resins.

This invention relates to a connection structure between the bumper main part and the bumper side of a so-called soft bumper made of an elastic material such as rubber.

Conventional technology Soft bumpers for automobiles are molded as is well known, but because the main part of the bumper and the sides of the bumper have an opening angle of about 90 degrees, it is difficult to mold them in one piece, and generally the main part of the bumper is The bumper side and bumper side are molded separately, and then connected with bolts and nuts. Examples of the connection structure between the main part of the bumper and the bumper side are disclosed in Japanese Utility Model Application Publication No. 51-108442 and Japanese Utility Model Application Publication No. 53-145640.
As shown in the publication No. 5, there is a known one in which the connecting end of the bumper side is wrapped over the end of the main part of the bumper, and the wrapped part is used to secure the vehicle with bolts and nuts or with clips. It is being However, in this type of lap joint, a step is formed at the connection between the bumper side and the main part of the bumper, and the lack of alignment significantly impairs the appearance.

For these reasons, in November 1981, Nissan Motor Co., Ltd. ((
Inc.) Published by Nirasan Laurel C31fi Maintenance Manual 356
As shown on the page, flanges are integrally molded at each connection end of the bumper main part and bumper side, and these flange surfaces are brought together and bolts and nuts are connected. There are known devices that can be matched and connected to one another. This is the 7th and 8th
As shown in the figure, a flange 3 is attached inwardly to each connecting end 1a, 2a of the bumper main part 1 and the bumper side 2.
, 4 are formed, and the 7 flange 3 and 4 surfaces are abutted against each other and bolts and nuts 5 are fixed at two locations, upper and lower. 6 in FIG. 7 indicates pampers tea.

Problems to be Solved by the Invention The bumper main part 1 and the bumper side 2 have a large degree of expansion and contraction in the longitudinal direction due to changes in outside air temperature.
However, since the directions of expansion and contraction of the bumper main part 1 and the bumper side 2 intersect, expansion and contraction forces act on the connecting part of the flanges 3 and 4 in the shearing direction of the flange 3 and 5a, and the 7 flange 3 and 4 Stress is concentrated on the edges of each bolt insertion hole 3a, 4a,
There was a high risk of cracking and damage. In addition, in order to fasten the 7 langes 3゜4 with bolts and nuts 5, the bumper main part 1 and the bumper side 2 need to be sub-assembled, which makes it impossible to assemble them separately to the vehicle body, making them long and large. The fact that it is difficult to handle due to its relative weight, is difficult to assemble, and requires a lot of effort on the part of the operator is still a problem.

Therefore, the present invention can avoid cracking or damage of the flange even if the main part of the bumper and the side of the pants expand or contract significantly in the length direction, and can be connected with one touch. To provide a connection structure between a bumper main part and a bumper side, which allows the bumper main part and the bumper side to be separately assembled to a vehicle body.

Means for Solving the Problem A plurality of approximately truncated conical bosses are protruded from the 7 flange surface of one of the flanges at the connecting ends of the bumper main part and the bumper side, and the other 7 flange is provided with a plurality of substantially truncated conical boss parts. A tapered hole is formed to accommodate the boss portion, and the boss portion and the tapered hole are engaged and connected.

Action Expansion and contraction in the longitudinal direction of the bumper main part and bumper side, especially expansion and contraction of the bumper main part, causes expansion and contraction force to act on the boss part in the shearing direction, but the tapered surface on the outer periphery of the boss part K [Since they are in contact, the acting force is dispersed to avoid stress concentration.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, with the same reference numerals assigned to the same parts as in the conventional structure.

In FIGS. 1 and 2, a truncated conical boss portion 10 is provided protruding from the upper and lower portions of the 7 flange 3 surface integrally formed on the connecting end 1a of the bumper main portion 1, while the connecting end of the bumper side 2 A taper hole 11 for accommodating the boss portion 10t is formed in a portion of the seven flange 4 integrally molded on the flange 2a that corresponds to the boss portion lO, and the boss portion 10 and the taper hole 11 are engaged to form a bumper It connects the main part 1 and the bumper side 2. The bumper main part 1 is assembled to the vehicle body via a panburst tie 6 (see FIG. 7), and the bumper side 2 is fixed to a fender (bracket and 7 ender are not shown) via a bracket with bolts and nuts. It is something that
The contact M of the 7 langes 3 and 4 is the bumper main part 1. When assembling the bumper side 20 to the vehicle body, the boss part 10 and the tapered hole 1 are sometimes used.
Press 1.

It is done by engaging. That is, for example, when the bumper main part 1 is assembled to the vehicle body first, the bumper side 2 is pressed with its 7 flange 4 against the 7 flange 3 of the bumper main part 1 to engage the boss part 10 and the tapered hole 11. Then, in this state, fix the bumper side 2 to the fender. bumper side 2
If the bumper main part 1 is fixed to the 7 ender first,
When assembling, the 7 langes 3 are pressed against the flange 4 of the bumper side 2, the boss portion 10 and the tapered hole 11 are engaged, and the bumper is fixed to the vehicle body via the pan burstie 6.

According to the structure of the embodiment described above, when the bumper main portion 1 expands and contracts in the longitudinal direction, expansion and contraction force acts on the boss portion 10 in the shearing direction, but the boss portion 10 has a truncated conical shape. Since the outer peripheral tapered surface engages with the tapered hole 11, the force in the shearing direction is dispersed by these tapered surfaces, thereby making it possible to avoid concentration of stress. In addition, since the bumper main part 1 and the bumper side 2 can be assembled to the vehicle body separately, they are easy to handle, reducing the labor of the worker and making the work easier.
Since the connection of the lunges 3 and 4 does not involve fastening bolts and nuts, work efficiency can be significantly improved. Furthermore, as mentioned above, since the bumper side 2 can be assembled separately from the bumper main part 1, unlike the conventional case where the bumper side 2 is sub-assembled to the bumper main part 1 and then assembled to the vehicle body, It is also possible to prevent the bumper side 2 from interfering with the fender and damaging the fender.

Here, the assembly of the bumper side 2 to the 7-ender is sometimes carried out as long as the boss portion 10 and the tapered hole 11 are engaged and the engaged state of both is maintained, that is, the assembly can be performed temporarily. can make the work even easier.

Therefore, in the embodiment shown in FIG. 3, the boss portion 10 is formed longer than the thickness of the flange 4, and an annular groove 12 is formed on the outer periphery of the tip portion, while an opening on the back side of the tapered hole 11 of the flange 4 is formed. A plurality of or annular locking pieces 13 are provided protruding from the edge, and when the boss portion 10 is engaged with the tapered hole 11, these annular grooves and the locking pieces 13 are engaged to temporarily lock the boss portion 10 to the tapered hole 11. . In addition, as shown in FIGS. 4 and 5, a clip 14 or an E-ring 15 can be attached to the tip of the boss 10 protruding from the tapered hole 11 for temporary fixation.

The embodiment shown in FIG. 6 has seven lunges 3 and 4 for the same purpose.
A locking protrusion 16 is formed in the shape of a letter on the outer periphery of the tip of the boss portion lO, and a pair of notches into which the locking protrusion 16 enters the tapered hole 11. 17 is formed.

The boss portion 10 is integrally formed in the center of a circular opening 18 formed in the flange 3 via a plurality of leg pieces 19.

Each of the leg pieces 19 is set to be slightly longer than the gap between the outer periphery of the base 10a of the boss 10 and the opening 18.
In addition, a thin hinge part 20t is formed on the continuous throw part at both ends, and the boss part 10 can be moved from the position where the locking protrusion 16 and the notch part 17 match to each other. The leg piece 19 can be rotated and stopped in the reversing direction with a click action at the corner of the leg. That is, in this embodiment, the locking projection 16 is inserted into the notch 17, the boss portion 10 and the tapered hole 17 are engaged, and the locking projection 16 is projected to the back side of the flange 4, and then the boss portion By rotating and stopping the leg piece 19 in the direction in which the leg piece 19 is reversed, the locking protrusion 1
6 engages with the back surface of the flange 4 to perform temporary fixing.

Note that the arrangement relationship between the boss portion 10 and the tapered hole 11 may be reversed to that in each of the above embodiments, that is, the boss portion 10 may be set on the 7 flange 4 side and the tapered hole 11 may be set on the flange 3 side.

Effects of the Invention As described above, according to the present invention, due to the engagement between the truncated conical boss portion and the tapered hole, the boss portion is caused to expand and contract in the longitudinal direction of the bumper main portion in the shear direction. The acting force can be dispersed, stress concentration can be avoided, and cracking or damage can be prevented from occurring at the connecting portion of the flange. In addition, the main part of the bumper and the bumper side can be separated and assembled on the vehicle body separately, and the connection of the 7 lunges does not involve tightening bolts and nuts, which greatly improves work efficiency. It is also possible to avoid damaging the 7 ender, which has a great practical effect.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, FIG. 2 is a perspective view of the same separated state, and FIGS. 3 and 4. FIG. 5 is a cross-sectional view of each prefecture of the present invention, FIG. 6 is a separated perspective view of still another example of the present invention, FIG. 7 is an exploded perspective view showing a conventional structure, and FIG. 8 is an exploded perspective view of a conventional structure. It is a sectional view taken along the line ■-■ in FIG. 7. 1, +, bumper main part, 1a, - connection end, 200. Bumper side, 2a...connection end, 3, 4...7 langes, 10...boss portion, 11...tapered hole. 2 people Figure 1 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] (1) Flanges are integrally molded on each connecting end of the main part of the bumper and the bumper side, and the flange surfaces are butted to connect. A connection structure between a bumper main part and a bumper side, characterized in that a boss part is provided protrudingly, one flange is formed with a tapered hole for accommodating the boss part, and the boss part and the tapered hole are engaged. .