JPH0637006U - Vehicle bumper structure - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] The present invention is to provide a bumper structure having excellent impact energy absorption of a vehicle. [Structure] When absorbing impact energy by buckling deformation of the bumper / line hosement 4 arranged in a substantially horizontal direction, the amount of impact energy absorption can be improved by causing the ribs 4a to 4d to buckle while interfering with each other.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bumper structure for a vehicle, and particularly to a structure for absorbing impact energy in a vehicle collision.

[0002]

[Prior art]

 Vehicle bumpers are required to have the function of preventing damage to the vehicle body in a light collision and absorbing as much impact energy as possible in the event of a further collision to protect passengers.

Therefore, conventionally, a bumper having a structure in which an energy absorber such as a urethane foam is attached to the front portion of the reinforcement, and a design skin is attached onto the energy absorber is used, and in a very light collision, An energy absorber, which is generally called an absorber, made of foam absorbs impact energy, and when a shock that cannot be absorbed by deformation of the foam is applied, the line reinforcement buckles and absorbs impact energy. Has become.

Recently, it has been desired to further increase the amount of energy absorption in order to improve safety. However, due to the design of the vehicle, there is a limit to the amount of protrusion of the front or rear portion of the vehicle of the bumper, and it is more compact. Therefore, a lightweight and low cost bumper structure is required.

Therefore, a structure as disclosed in Japanese Patent Laid-Open No. 2-234861 has been proposed as such a solution, but the structure is complicated and the weight must be increased, and the second cushioning member is used. Although it can be expected to absorb some energy, it cannot be expected to improve energy absorption due to deformation of the bumper reinforcement.

[0006]

DISCLOSURE OF INVENTION Problem to be Solved by the Invention The present invention is to provide a structure capable of absorbing more impact energy in a lean hosement, low cost, and excellent in space saving.

[0007]

[Means for Solving the Problems]

 In the present invention, when a collision impact is applied from the front part of the bumper / line hosement, the energy is absorbed by the deformation resistance of the substantially horizontal rib of the bumper / linehosement, and the mechanism is considered in good faith. As a result, they found that the buckling deformation of the paired ribs while they were laid over each other was far greater than the energy absorption due to the individual collapse.

Therefore, the ribs are formed in a substantially arc shape so that the pair of ribs buckle while interfering with each other, and the chord side is outside the pair of ribs.

[0009]

[Action]

 According to the structure of the present invention, when an impact is applied to the bumper / line hosement, the substantially horizontal ribs start to fall in the directions opposite to the center of the arc. Then, when the amount of deformation increases, the pair of ribs deforms with contact interference.

[0010]

【Example】

 Embodiments according to the present invention will be described with reference to the accompanying drawings. Needless to say, as long as the configuration according to the present invention is adopted, it is possible to appropriately change them, and in particular, the number of ribs of the line hosement and the ribs to be paired therewith. The length and interval can be set according to the amount of shock energy absorption required.

FIG. 1 is a sectional view of a bumper / line hose 4 according to the present invention, which is fastened (not shown) to a member bracket 6 of a vehicle body with bolts or the like.

The bumper cover 1 is fixed to the cover support 3 with a clip 8 via a cover pressing plate 7.

The bumper / line hosement 4 has ribs 4a, 4b, 4c, and 4d in a substantially horizontal direction formed in a substantially arc shape, and the ribs 4a, 4b, 4c, and 4d forming a pair are respectively formed. The chord side is set to be placed outside the corresponding rib.

The bumper cover 1 is deformed, the absorber 2 is compressed, a load is applied to the bumper reinforcement 4, and the ribs 4a, 4b, 4c, 4d are buckled and deformed to absorb the impact energy.

2 and 3 show a deformed state at the time of a vehicle collision.

FIG. 4 shows the relationship between the displacement of the front part of the bumper and reinforcement and load.

Curve I is the case according to the present invention, and as a comparison, curve II is shown in the case where ribs are not circular arcs but are arranged horizontally and interference does not occur during buckling deformation. According to this, it is clear that the load drop after the start of buckling is moderate and the impact energy absorption amount is improved by about 20%.

[0018]

[Effect of device]

 According to the present invention, the impact energy absorption amount can be easily increased without increasing the size and wall thickness of the bumper / line hosement, which is very inexpensive and space saving.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a side member 5 portion when a bumper reinforcement is attached to a vehicle.

FIG. 2 shows an intermediate state between FIG. 1 and FIG.

FIG. 3 shows a deformed state at the time of collision.

[Fig.4] Displacement of bumper and reinforcement during a collision-
The load curve is shown.

[Explanation of symbols]

 1 ... Bumper cover 2 ... Absorber 3 ... Cover support 4 ... Bumper reinforcement 5 ... Side member 6 ... Member bracket 7 ... Cover holding plate 8 ···clip

Claims (1)

[Scope of utility model registration request] 1. One or more pairs of substantially horizontal ribs are provided, and the pair of ribs are arranged so that they are substantially arcuate and the chord side is outside the pair of ribs. Bumper structure that has a bumper and reinforcement.