JPH03217355A - Vehicle bumper - Google Patents

Abstract

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

Description

[Detailed description of the invention] Industrial applications The present invention relates to a bumper for a vehicle.

An example of a conventional automobile bumper is shown in FIG. 2, for example.

In the figure, l indicates a pump stay, and this pump stay 1 is provided with a mounting hole 2 for mounting on the vehicle body.

A pamba armature 3 is attached to the front end of the pampastay l.

The Pamba armature 3 is formed into a closed cross-sectional structure by joining an outer member 3a and an inner member 3b each having a hat-shaped cross section, and a bumper fascia is provided on the upper side of the joint flange portion 4 of the Pamba armature 3. The upper edge flange portion 5a of No. 5 is bolted.

The bumper fascia 5 is molded from resin or the like, and between the bumper fascia 5 and the outer member 3a of the bumper armature 3, there is an energy absorbing material 6 such as urethane foam.
(This similar structure is, for example,
-184055).

Problems to be Solved by the Invention Although the front end surface of the outer member 3a of the bumper armature 3 has a flat shape, the outer surface of the bumper fascia 5 is curved up and down, so that the filled energy absorber 6 is bent in the front-rear direction. The wall thickness differs in each part in the vertical direction.

Therefore, the amount of collapse at the time of a vehicle frontal collision, that is, the collapse rate of the energy absorber 6 compressed in response to the bumper stroke, differs between the upper and lower positions (between the 8th position and the B position).
As a result, the upper part of the bumper armature 3 shown in part a in FIG. This causes a problem in that a clockwise moment C as shown by the arrow in FIG. 2 is generated in the bread stay 1, causing slippage of the fastening point of the bread stay 1 and deformation of the bread stay 1.

In addition, in the lower part b, the energy absorber 6 has an upper part λ
There is a problem in that, because it does not collapse sufficiently compared to the other parts, it does not have an effective energy absorption effect.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a bumper for a vehicle that allows an energy absorber to function effectively in the event of a top-side collision of a vehicle.

Means for Solving the Problems In an automobile bumper in which a bumper fascia is attached to a breadboard armature supported by a vehicle body, and an energy absorber is filled between the bumper armature and the bumper armature, the tip position of the breadboard fascia is Corresponding to the amount of retreat of each part from ? A protrusion is provided on the front side of the pump armature to match the collapse rate of the energy absorber in the vertical direction.

In order to prevent the collapse rate of the bumper fascia from decreasing as the amount of retreat from the tip of the bumper fascia increases when the bumper fascia and the energy absorber are compressed rearward during a frontal collision of the vehicle, the above-mentioned measures are taken. The front side surface of the pamba armature is made to protrude according to the amount of retreat to make the crushing rate of the energy absorber uniform over the entire effective impact portion of the pamba fascia.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings, in which the same parts as in the conventional structure are denoted by the same reference numerals.

In FIG. 1, a bumper armature 3 is attached to the front end of a bumper stay l having a mounting hole 2 to be attached to the vehicle body. amateur 3
The upper edge flange portion 5a of the resin bumper fascia 5 is bolted to the upper side of the joint flange portion 4 of The point that the absorbent body 6 is filled is the same as in the prior art.

Here, the pumping Asia 5 is formed such that the upper and lower parts of the tip P recede from the position of the tip P and are curved in the collision effective part (between L and H),
Corresponding to the retracted bottle of these retracted portions, a protrusion 7 is provided on the corresponding front side surface of the outer member 3λ of the bumper armature 3 in order to match the crushing rate of the energy absorber 6 in the vertical direction in the collision effective portion. It is formed.

Specifically, the amount of protrusion of the protrusion 7 at the lower part of the tip P is y
, where X is the amount of retraction of the retracted portion of the bumper fascia 5 corresponding to this protrusion 7, and a is the bumper stroke line at the time of a vehicle frontal collision, the above xSy is determined as follows.

Bumper stroke line ρ from tip P of bumper fascia 5
Let A be the distance from the front side of the bumper armature 3 to the bumper stroke line Q, B/A=K ・・・・・・・・・・・・・・・(1)
Then, at the bottom of the tip P of the Pamba fascia 5, (B-y)/(A-x)=K... (2)
If this holds true, the collapse rate of the energy absorber 6 in each part at the time of a vehicle surface collision is A/(A+B)(-1/(1
+K)) will be equal.

Substituting B=AK obtained from equation (1) into equation (2) and rearranging it, y / x = K ・・・・・・・・・・・・
・(3) becomes.

Therefore, in order to establish the relationship y/x -=K, there is a spacer on the front side of the bumper armature 3 (outer member 3a) corresponding to the amount of retraction of the front side of the bumper fascia 5 (dimension retracted from the tip P). All that is required is to form the protrusion 7.

In this way, the Pamba armature 3 (outer member 3a)
By forming a protrusion on the front side of the pan-buff asia 5 with a protrusion amount corresponding to the amount of retreat from the tip P of each part of the front side of the pan-buff asia 5, the energy absorber 6 can be crushed to a certain degree in the event of a frontal collision of the vehicle. This prevents a moment from acting on the bread-pasta-stay 1 and prevents slippage from occurring in the mounting hole 2 of the bread-pasta-stay 1.

Here, as mentioned above, the crushing rate is given by A/(A+B), that is, 1/(1+K) ('.'B/A=K)
, the value is said to be 70 to 80%, which is a high energy absorption efficiency.

Therefore, K (1 B/
The value of A) is preferably 0.43 to 0.25.

Effects of the Invention As explained above, according to the present invention, the collapse rate of the energy absorber is matched in the vertical direction on the front side of the bumper armature in accordance with the amount of retreat of each part from the tip position of the bumper fascia. Because the protruding part is formed, the energy absorber, which is compressively deformed during a frontal collision of the vehicle, can maintain a uniform collapse rate in the vertical direction, and therefore can efficiently absorb energy without applying biased force to the vehicle body. This has the effect of increasing absorption.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional technique. 3...Pamba Amacha, 5...Bumpa Facia,
6...Energy absorber, 7...Protrusion part. Figure 1 l 3---Pashino de Amako 7 5---B'Medicine Mafe Isiah 6---Ichiku 5t Le N'FJjJlx'Iho 7-11 Prominent sound

Claims (1)

[Claims] (1) In a vehicle bumper in which a bumper fascia is attached to a bumper armature supported by the vehicle body, and an energy absorber is filled between the bumper fascia and the bumper armature, each part from the tip of the bumper fascia A bumper for a vehicle, characterized in that a protrusion is formed on the front side of the bumper armature to match the collapse rate of the energy absorber in the vertical direction in accordance with the amount of retreat.