JPS59171760A - Car front fender - Google Patents

Abstract

PURPOSE:To improve the impact strength of a front fender, by a method wherein the main part of a fender, gradually increased in thickness, is connected to an arch-shaped part and a rear end part. CONSTITUTION:A front fender F is secured to a car body assembly body B so that it constitutes a part of a car body, and is adapted to cover the upper surface of a front wheel Wf. The front fender F consists of a thickened arch part 1 which extends along the upper surface of the front wheel Wf and is longitudinally formed in a beltlike shape, a thickened rear end part 2 which is positioned on the front pillar Pf side of the car body assembly body B and is formed in a beltlike shape, and a main body part 3 of the fender which is a portion except the arch-shaped part 1 and the rear end part 2 and is more thinned than those parts. The main part 3 of the fender, gradually increased in thickness, is connected to the arch-shaped part 1 and the rear end part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a front fender for an automobile that is fixed to a vehicle body assembly so as to constitute a part of the vehicle body and covers the upper surface of a front wheel.

Generally, in order to reduce the weight of the entire vehicle body, it is conceivable to use a front fender made of plastic or plastic instead of a steel plate. However, front fenders made of synthetic resin are inferior to those made of steel plates in terms of impact strength, and in particular, the arched part along the top surface of the front wheel and the rear end part on the front pillar side are not included in the vehicle body except for those ends. Since there are no attachment points to the three-dimensional structure, there is a problem in that distortion is likely to occur when an external impact load is applied to them.

In view of the above, an object of the present invention is to provide the above-mentioned front fender, which can improve the impact strength of the arched portion and the rear end portion, thereby eliminating the conventional problems.

An embodiment of the present invention will be described below with reference to the drawings. is fixed to the vehicle body assembly B so as to constitute a part of the vehicle body, and covers the upper surface of the front wheel Wf.

The front fender F is integrally molded using thermoplastic synthetic resin with relatively excellent impact resistance, such as polycarbonate resin, polycarbonate alloy resin, and polycarbonate ABS resin. a thick arched portion 1 that forms a band-like shape in the front and rear along the vehicle body assembly B; It consists of a fender main body part 3 which is thinner than the rear end part 2 except for the rear end part 2. The fender main portion 3 is connected to the arched portion 1 and the rear end portion 2 by gradually increasing its wall thickness.

With this configuration, the impact resistance of the arched portion 1 and the rear end portion 2 is increased, and stress concentration due to the difference in wall thickness at the connection between the two sections 1゜2 and the fender main portion 3 is prevented. As a result, the impact strength of the front fender F can be improved.

Further, a mounting bent portion 4 having a substantially hooked cross section is formed on the inside of the upper edge of the fender main portion 3, and a reinforcing bent portion 5 is formed on the inside of the lower edge of the arched portion 1. The inner corners 61 to 64 of the bent portions 4 and 5 have a radius of 0.5
It is formed into a circular arc surface of ++a++ or more. Thereby, when an impact load is applied to the front fender L', it is possible to prevent the impact load from being concentrated on the respective side corners 61 to 64, thereby avoiding the occurrence of cracks, damage, etc. As a result of the experiment, each inner corner 61
~640 When the radius of the circular arc surface was Q, 4 m or less, stress was generated in them, and cracking and damage were observed.

The reason for strictly setting the radius of each inner corner 61 to 640 is that the polycarbonate resin has relatively excellent impact resistance, so in order to fully demonstrate its characteristics, it is necessary to prevent stress concentration. This is because parts need to be removed.

In general, the front fender l? In order to improve the external appearance, the cavity surface of the mold is finished with high precision so that the surface roughness is approximately 0.3μ. The surface roughness is rough.However, when an impact load is applied to the outer surface of the front fender, a tensile force is applied to the inner surface, so the surface roughness of the inner surface becomes the front fender t=
'The influence of thickness on impact strength is shown in Figure 5:
A flat polycarbonate resin test piece with an outer surface roughness of 01μ was used.
This figure shows the case where the DuPont impact test at 130tZ' was performed with the surface roughness of the lj surface changed by 1]i, and as is clear from this figure, the DuPont impact value was 270 to 300 ky,'*c
In order to obtain m, the surface roughness of the inner surface must be 5 μ or less. In the present invention, the cavity surface of the mold is finished with high precision so as to obtain such surface roughness.

The front fender F having the above configuration includes a tip a of the arched portion 1, a rear end of the arched portion 1, or a lower end b of the rear end portion 2.
, the upper end C of the rear end portion 2 and the four points d of the folding part 4 for picking up.
, 9 in total to the vehicle body assembly B.

As described above, according to the present invention, molded from synthetic resin,
A front fender for an automobile is fixed to a car body assembly so as to constitute a part of the car body, and covers the top surface of the front wheel. , except for the thick rear end part that forms a band shape up and down located on the front pillar side of the vehicle body assembly, the arched part and the rear end part, the main part of the fender is thicker than those parts, and the main part of the fender is The impact resistance of the arched part and the rear end part was improved by gradually increasing the wall thickness of the part and connecting it to the arched part and the rear end part.
'=;<L Also, it is possible to improve the impact strength of the front fender by preventing stress caused by the difference in wall thickness at the connection between the two sections and the main body of the fender.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show one embodiment of the present invention, in which FIG. 1 is a perspective view of an automobile, FIG. 2 is a side view of a front fender, and FIG. 3 is a side view of a front fender. The heel cross-sectional view in Figure 4 is Figure 2 I.
The V-TV cross-sectional view, FIG. 5, is a graph showing the relationship between surface roughness and DuPont impact value. B...Vehicle assembly, L...Front fender, J
J7f...Front wheel p f...Front pillar, 1...Archied part, 2...Rear end part, 3...
Fender main part patent applicant Honda Gitsukuda Kogyo Co., Ltd.

Claims (1)

[Claims] An automobile front fender is molded from synthetic resin, is fixed to a vehicle body assembly so as to constitute a part of the vehicle body, and covers the upper surface of the front wheel, and has a front and rear 'fl' M shape along the upper surface of the front wheel. a thick arched portion forming a wall, and a thick rear end portion forming a band (C) located on the front pillar side of the vehicle body assembly, excluding the arched portion OJ and the rear end portion ( , meat than them'
It consists of the fender main part of AM, and the fender main part is fffu! A front fender for an automobile comprising a thicker wall and connected to the arched portion and the rear end portion.