JPS5863546A - Bumper for automobile - Google Patents

Abstract

PURPOSE:To reduce a noise, suppress vibration and improve appearance quality in a bumper for an automobile, by closely fixedly attaching a reinforcer, having an almost squared section with one end open, to the inside of a resin skin, having an almost squared section with one end open, through soft shock absorbing materials. CONSTITUTION:A bumper A is provided with a resin made skin 1 of one end- opened almost square-shaped section and reinforcer 2 of one end-opened almost square-shaped section fitted to the inside of this skin 1. A sheet 6 is interposed as a soft shock absorbing material between the internal surface of an upper side 1a of the skin 1 and the outside of an upper side 2a of the reinforcer 2, similarly a sheet 6 is interposed between the internal surface of a lower side 1b of the skin 1 and the external surface of a lower side 2b of the reinforcer 2. Further a resin sheet 7 of excellent vibro-isolating quality is mounted to an internal side of the reinforcer 2. Then the reinforcer 2 and the skin 1 are fixed by a carriage bolt 4 and stepped bolt 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automobile bumper, and more particularly to an automobile bumper having a resin skin that is effective against light collisions.

What is generally called a resin bumper is K as shown in Figure 2.
It has become. In other words, Pa/Pam is a resin example with a roughly U-shaped cross section, and is equipped with a urethane skin l and a reinforcement 2 that is fitted inside the skin l and fixed to the vehicle body B via a pan busty 3. , epidermis l and reinforcement 2
1. In order to absorb the difference in the amount of expansion and contraction due to thermal changes between the two, the mounting is done using a stepped cap, a ridge bolt l, and a stepped bolt j to enable relative change.

However, in such a structure, the skin 1 and the reinforcement 2 have different general surface parts (other than the bolt attachment part) due to manufacturing variations.
Gaps easily form in the mounting area, and stepped bolts are used instead of fully tightened to smooth out the movement of the skin due to thermal changes, so vibrations during driving may cause chattering noises. When the skin is pressed or struck by hand, a low-grade rattling sound may be heard, and when the skin l expands and contracts due to thermal changes, the skin l will move against the reinforcement 2 due to the sliding resistance between the skin l and the reinforcement λ. The skin, which moves smoothly, sometimes becomes wavy, and some kind of countermeasure is desired in terms of noise/vibration resistance, appearance quality, etc.

The present invention was made in view of the above circumstances, and it is an object of the present invention to provide a bumper structure that is excellent in noise and vibration resistance and appearance quality, and does not emit a low-grade sound even when struck by hand.

As a means to achieve this purpose, a resin skin with a substantially U-shaped cross section that is effective in light collisions, and a reinforcement with a substantially U-shaped cross section fitted inside this skin are provided, and these skins and reinforcements are fitted. In addition to attaching it to 5 so that thermal deformation can be absorbed, at least a soft cushioning material is interposed between the inside of the upper surface of the tun skin and the outside of the upper surface of the reinforcement to bring them into close contact with each other. Even if there are manufacturing variations, the deformation of the cushioning material will fill the gap between the two and produce a deep, low-frequency sound without producing a low-grade sound even when struck by hand. Since the contact between the tire and the reinforcement is kept close, there is no chattering noise while driving, and the skin follows the expansion and contraction extremely well even when the skin tries to expand or contract due to thermal deformation.

In this invention, at least (between the inside of the top surface of the skin and the outside of the top surface of the reinforcement) means that a cushioning material can also be interposed between the inside of the bottom surface of the skin and the outside of the bottom surface of the reinforcement.

An example will be described below. In FIG.
It is equipped with a substantially U-shaped reinforcement λ with a #fr surface that is fitted inside the skin l of and , and is fixed to the vehicle body B by fixing a pan busty (not shown) to this reinforcement 2. . The skin l and the reinforcement 2 are attached and fixed by the stepped carriage bolt der and the stepped bolt jK at an appropriate interval in the vehicle width direction. A soft cushioning material, for example, a sheet made of soft vinyl chloride, is interposed between the upper surface and the outer surface of the iJa, and similarly
A sheet 6 is also interposed between the inside of 1) and the outside of the lower surface 2b of the rain forceco. Moreover, a resin sheet 7 with excellent vibration damping properties is installed on the inside of the rain force 2. .

To describe the installation of the cholera sheet 6.7 and the attachment of the skin l to the reinforcement 2, first, as shown in Figure 1, the sheet 6ft is attached to the inside and outside of the upper surface Ja and lower surface 2b of the reinforcement λ. Attach the sheet 7 as shown by the arrow Y on the inside of the reinforcement. Then apply reinforcement 2 to the epidermis/' with arrow 2
Insert it as shown in , and securely attach the cover l and the reinforcement using the carriage bolt der and stepped bolt j. Note that both seats ≦, 7 bolts.

Naturally, a bolt insertion hole (not shown) is provided in the mounting portion of j.

As shown in FIG.
It can also be mounted by applying the soft resins 9 and 10 to form a layer of a predetermined thickness.

As is clear from this example, a cushioning material is interposed between the inside of the upper skin surface /& and the outside of the reinforcement upper surface 2a by adhering or coating a soft resin sheet to bring the two into close contact. As a result, the occurrence of chattering noise between the two while driving is significantly reduced, and even when the epidermis is struck by hand, there is no low-grade rattling sound, and the force of the strike is reduced. It is reliably transmitted from the outer skin to the reinforcement via the cushioning material 6.7, producing a sound full of profound luxury. Furthermore, even if the skin 1 is thermally deformed and moves relative to the reinforcement 2, the function K of the buffer material 6.9 ensures smooth expansion and contraction, and the skin 1 does not wave.

Here, in this example, iQK of the reinforcement λ is also pasted or coated with a resin sheet, so the distribution of the reinforcement λ is even more excellent, and the effect on the chattering noise during driving is further improved. can be suppressed.

According to the above-mentioned invention 22, it is possible to construct a bumper with excellent noise and vibration resistance, and an excellent appearance quality that effectively prevents ripples on the skin, and also produces a high-quality sound even when struck by hand. It can be used as a high-quality banba, and the practical effect is great.

[Brief explanation of the drawing]

Fig. 1 is a front plan view of the automatic military, Fig. 2 is a sectional view taken along the line M-M in Fig. 1 showing a conventional example, and Fig. 3 is a sectional view similar to Fig. 2 showing an embodiment of the present invention. , FIG. 5 is an explanatory view in the lFr plane showing the method of assembling the above embodiment, and FIG. 5 is an explanatory view similar to FIG. 4 showing another embodiment of the present invention. A...Bumper, B...Body, l...Skin, /a...
・Upper surface of the support, /b...Lower surface of the epidermis, 2...
......Reinforce 1, 2a...
...Reinforce top surface, Cob......Reinforce bottom L g, 9...Buffer material. Note 1 Note 2 Note 9 Note

Claims (1)

[Claims] It includes a skin having a substantially U-shaped cross section and a reinforcement having a substantially U-shaped cross section that fits inside the skin, and a soft cushioning material is interposed between at least the inside top surface of the skin and the outside top surface of the reinforcement. Pampa for automobiles.