JPS598552A - Automobile bumper - Google Patents

Abstract

PURPOSE:To provide the susceptibility to buckling deformation at a collision so as to improve the bumping performance in a synthetic resin bumper which has the ?-shaped section and has a plurality of ribs projectingly arranged on the back face of the front wall thereof by providing respective spaces between the ribs and the upper wall and the lower wall of the bumper. CONSTITUTION:A front bumper 31 which is made of synthetic resin has the upper wall 32, the lower wall 33 and the front wall 34, has the approximately ?-shaped section and extends in the width direction of a car. The bumper 31 has at both the upper and lower rear ends flanges 38 and 39 which project rearward. A bumper rain forth 36 which extends in the width direction of a car is tightened to the bumper with bolts 42 and nuts 43 and the bumper 31 is attached to a carside supporting member 46 via a couple of stays 45 which are fixed to the bumper rain forth 36. Said front wall 34 has a plurality of flat ribs 51 arranged on the rear face thereof in the width direction of the car, each of the ribs 51 having upper and lower slant faces 52 and 53. Consequently, spaces 55 and 56 may be defined between the slant faces 52 and 53 and the upper and the lower walls 32 and 33.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bumper for an automobile that absorbs impact during a collision, and particularly to a bumper for an automobile made of synthetic resin.

In recent years, the use of automobile bumpers made of synthetic resins such as polypropylene, polycarbonate, etc. has been increasing in order to reduce the weight of vehicles.

Conventional synthetic resin automobile bumpers include No. 1.2.
．． The one shown in Figure 3 is known. In FIG. 1, ■ is an automobile, and this automobile 1 has a synthetic resin front flap 2 which extends in the direction of the interior of the automobile and is bent and molded at both ends so as to surround the front portion of the automobile 1. As shown in FIG. 2.3, the bumper 2 has an upper wall 3, a lower wall 4, and a vertical wall 5 connecting the front ends of the upper wall 3 and the lower wall 4. It has a letter shape. 7 is a bumper reinforcement, and this bumper reinforcement 7 is a vertical wall 8. ! It has flanges 9 and 10 that protrude rearward from the upper and lower ends of the JI wall 8, has a U-shape in cross section, extends toward the interior of the vehicle, and has approximately the same length as the interior of the vehicle. be. The bumper reinforcement 7 is housed in the bumper 2, and is located between the rear part n of the upper wall 3, the flange 9, the rear part n2 of the lower wall 4, and the flange 10.
are fixed by bolts 13 and nuts 14 via retainers 12, respectively. A pair of stiffeners 17 are fixed to the vertical wall 8, and each stiffener 17
are attached to each side member 18 of the automobile 1 by bolts 19. Reference numeral 21 denotes a plurality of ribs spaced a predetermined distance apart in the vehicle direction, and each rib 21 projects rearward from the rear surface of the vertical wall 5 and extends in the vertical direction. Further, the upper end and lower end of each rib 21 are connected to the slope 1 of the upper wall 3, respectively.
1 and the upper surface of the slope β2 of the lower wall 4. Further, each rib 21 is spaced apart from the vertical wall 8. When such a front humber 2 collides with an obstacle R as shown in FIG. The central part m1 of the second wall 3 and the lower wall 4 do not deform because of their high rigidity and are not continuous with the rib 21.
The central portion m2 of the vehicle undergoes buckling deformation and absorbs the impact caused by the collision.

However, such conventional automobile bumpers have a problem in that when the front bumper 2 collides with the pedestrian IHf, the damage caused to the pedestrian is large. The reason is that the brittle central portion m and m of the bumper 2
2 is because the IJ is narrow in the front-rear direction, making it difficult to buckle when colliding with a soft object such as a pedestrian.

This invention was made by focusing on the above-mentioned problems.
It is an object of the present invention to solve the above-mentioned problems by providing spaces between the ribs of the hanger and the upper and lower parts, respectively.

An embodiment of the present invention will now be described based on the drawings. In FIG. 5, 31 is a front bumper for an automobile made of synthetic resin. wall 33, upper wall 32 and lower wall 3
a vertical wall 34 as a front part connecting the front ends of 3;
It has a U-shaped cross section and extends towards the inside of the car. Reference numeral 36 designates a bumper reinforcement having a U-shaped cross section, and includes a vertical wall 37 having an approximately U-shaped cross section, and flanges 38 and 39 projecting rearward from the upper and lower ends of the vertical wall 37, respectively. Reference numeral 36 extends in the direction of the inside of the car and has approximately the same length as the inside of the car. The bumper reinforcement 36 is housed in the bumper 3I, and the rear part r of the upper wall 32 and the flange 38 and the rear part r2 and flange 39 of the lower wall 33 are respectively connected to the retainer 41.
It is fixed by a bolt 42 and a nut 43 via. A pair of stiffeners 45 are attached to the rear surface of the vertical wall 37 at a predetermined distance apart from each other in the direction of the interior of the vehicle. The bumper reinforcement 36 and the stiffener 45 collectively constitute a vehicle body side support member 46. As a result, the upper and lower portions of the front bumper 3I are respectively connected to the vehicle body side support member 46. The stiffener 45
is a bolt 4 attached to a pair of side members 47 of an automobile.
It is fixed by 8. Reference numeral 51 denotes a plurality of flat plate-shaped ribs spaced a predetermined distance apart in the direction of the inside of the vehicle, and each rib 51 projects rearward from the rear surface of the vertical wall 34 and extends in the vertical direction. Furthermore, each rib 51 connects the 1&end of the upper slope 52 and the lower slope 53 with an upper slope 52 that slopes backward and downward from the upper end and the lower end of the vertical wall 34, and a lower slope 53 that slopes backward and upper. It has a rear end surface 54.

As a result, the upper slope 52 of each rib 51 and the slope p of the upper wall 32
, and between the lower slope 53 of each rib 51 and the slope p2 of the lower wall 33, spaces 55 and 56 are formed, respectively, and each rib 51 is separated from the damper reinforcement 36.

Next, the operation of one embodiment of the present invention will be explained. The vertical wall 34 has high rigidity because it is continuous with the rib 51, but the slope p of the top wall 32 and the slope p2 of the bottom wall 33 are separated from the top slope 52 and bottom slope 53 of the rib 51, respectively. Central part q.

And like q2, it is vulnerable. The upper weak part of the front bread bar 31 is composed of the slope pI and the center part q, and the lower weak part is composed of the slope p2 and the center part q2, and the width of each weak part in the front and rear direction is wide. ing. Therefore, as shown in FIG. 6, when the front bumper 31 collides with the obstacle R1, for example, a pedestrian, each fragile portion is easily buckled and deformed. As a result, the deformation of the upper wall 32 and the lower wall 33 can sufficiently absorb the impact without causing serious damage to the pedestrian, and the damage to the pedestrian can be significantly reduced compared to the conventional case. Also, front bumper 3
1 collides with another car, building, etc., each fragile portion deforms further, and the rib 51 hits the bumper reinforcement 36 and undergoes buckling deformation to absorb energy.

In this way, in this embodiment, in the event of a minor collision such as a collision between a pedestrian and a vehicle, the upper wall 32 of the upper part of the hamper and the lower wall 33 of the lower part deform, and this deformation absorbs energy.
At this time, since both the upper wall 32 and the lower wall 33 have low rigidity,
Even if the collision speed is relatively high, pedestrians will not be seriously injured. In addition, in the event of a large-scale collision, such as when two vehicles collide, the ribs 51 come into contact with the reinforcement 36 and undergo buckling deformation, ensuring the original rigidity of the humber, and absorbing the impact without deforming the vehicle body due to buckling of the ribs. I can do it.

As explained above, according to the present invention, spaces are provided between the ribs of the bumper and the upper and lower parts, respectively.
This has the effect of reducing damage to pedestrians without impairing the original function of the pamba.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the front part of an automobile viewed diagonally from the front, Fig. 2 is a perspective view illustrating how a conventional automobile bumper is attached to the car body, and Fig. 3 is a perspective view of the m- m arrow sectional view,
FIG. 4 is an explanatory diagram of the operation of FIG. 3, FIG.
FIG. 2.31----1 automobile bumper, 3.32--1 upper part, 4.33----1 lower part, 5.
34---1.Front part, 7.36~------Hampa reinforcement, 17.4
5---Stiffener, 21, 51---Rib, 46---Vehicle body side support member, 55.56---One space.

Claims (1)

[Claims] In the synthetic resin automobile bumper comprising an upper part and a lower part connected to the vehicle body side support member, a front part connected to the upper part and the lower part, and a rib provided at the front part and spaced apart from the vehicle body side support member, A bumper for an automobile, characterized in that spaces are provided between the rib and the upper and lower parts, respectively.