CN106828375B

CN106828375B - Front collision crossbeam

Info

Publication number: CN106828375B
Application number: CN201710081325.0A
Authority: CN
Inventors: 鲁文川; 李天兵; 牛伟; 吴玉禄; 周阳
Original assignee: Chongqing Changan Automobile Co Ltd
Current assignee: Chongqing Changan Automobile Co Ltd
Priority date: 2017-02-15
Filing date: 2017-02-15
Publication date: 2020-01-10
Anticipated expiration: 2037-02-15
Also published as: CN106828375A

Abstract

The invention relates to a front collision beam which comprises a collision beam body, wherein the collision beam body comprises an outer frame and an inner supporting rib, the inner supporting rib is supported between the front wall and the rear wall of the outer frame, and the section thickness of the inner supporting rib is gradually thickened from the front wall to the rear wall.

Description

Front collision crossbeam

Technical Field

The present invention relates to a cross beam; and more particularly to a front impact beam.

Background

In order to more fully absorb the energy in collision, more and more mass-produced vehicle types adopt the aluminum alloy front collision beam body 1, so that the requirement of collision absorption energy can be met, and the density is lighter than that of a steel front collision beam.

Referring to fig. 1 and 2, a front impact beam body 1 is fixed to a vehicle body by mounting brackets 2 on left and right sides. Wherein, a towing hook pipe 3 of a part of vehicle types is fixedly connected on the front collision beam body 1. The common fixing modes are as follows: the towing hook pipe 3 penetrates through the front wall 111 and the rear wall 112 of the front collision beam body 1, and the towing hook pipe 3 is fixedly connected to the front collision beam body 1 at the joint of the towing hook pipe 3 and the front wall 111 and the rear wall 112 through a welding fixing mode. A tow hook for a tractor vehicle is screwed with the tow hook pipe 3.

In the process of towing the vehicle to move ahead, the fixed connection part of the towing pintle pipe 3 and the front collision beam body 1 has insufficient local strength due to stress concentration. In order to improve the problem of local strength of the front impact cross beam, two schemes are provided at present.

The first scheme is as follows: and a reinforcing plate 4 is welded at the fixed connection part of the towing pintle pipe 3 and the front collision beam body 1. The local force of the front impact beam body 1 is improved by the modification of the reinforcement plate 4. The number of the reinforcing plates 4 to be mounted and the mounting positions are three. Referring to fig. 2, the reinforcement plate 4 is welded to the front wall 111 of the front impact beam body 1. The second is to weld the reinforcement plate 4 to the rear wall 112 of the front impact beam body 1. The third is that reinforcing plates 4 are welded to both the front and rear walls of the front impact beam body 1.

Scheme II: referring to fig. 3, the strength of the front impact beam body 1 is improved by increasing the thickness a1 of the front wall 111, the thickness a2 of the rear wall 112, and the thickness A3 of the inner brace 12.

In the first aspect, the welding of the reinforcement plate 4 adds a process of machining the front impact beam body 1. In the second embodiment, the cross section is thickened, which results in an increase in the overall mass of the front impact cross member, which is very disadvantageous from the viewpoint of cost and pedestrian protection.

Therefore, under the condition of ensuring the performance of the front collision cross beam, how to reduce the production cost becomes a problem to be solved urgently.

Disclosure of Invention

The invention aims to reduce the production cost of the front collision cross beam under the condition of ensuring the performance of the front collision cross beam.

In order to achieve the above effects, the present invention provides a front collision beam, including a collision beam body, the collision beam body includes an outer frame and an inner bracing rib, the inner bracing rib is supported between a front wall and a rear wall of the outer frame, and a cross-sectional thickness of the inner bracing rib gradually becomes thicker from the front wall to the rear wall.

Furthermore, the thickness of the cross section of the inner bracing rib is gradually changed in a straight line or gradually changed in an inward concave curve.

Further, the collision beam body is made of aluminum alloy.

Further, the collision beam body is formed by adopting an extrusion process. The extrusion process has low manufacturing cost and good manufacturability.

Further, the thickness of the thickest part of the inner bracing rib is not more than 2 times of the thickness of the thinnest part. The requirement of 2 times thickness ensures that the aging deformation of the inner supporting rib is in a controllable range after aging treatment, thus the qualification rate of the product is improved.

Further, the thinnest part of the outer frame and the inner supporting rib is not less than 1.8mm in thickness. The requirement of the thickness of 1.8mm can ensure the deformation resistance of the extruded part and the yield of the part.

Further, the thickness of the thick part is 1.2 times of the thickness of the thin part. The 1.2 times thickness design is the lightest mass with the strength satisfied.

Further, the collision beam body has no sharp point. The design of no cusp has improved the performance of collision crossbeam body, has avoided the problem of structural strength sudden change.

Further, the front wall thickness is less than the back wall thickness.

Furthermore, two inner supporting ribs are arranged in the outer frame, and the extending section of the collision beam body is in a shape like a Chinese character 'mu'.

The invention has the beneficial effects that:

when the collision beam body is pulled by the tow hook, stress concentrates on the rear wall of the collision beam body. The concentrated stress of the rear wall is relieved by deformation of the thick-side inner bracing. The cooperation of the thin-side inner bracing rib and the front wall reduces the strength and rigidity of the front wall and improves the protection of the legs of pedestrians. The gradually-changed thickness structure of the cross section of the inner bracing rib not only meets the structural strength required in vehicle traction, but also improves the protection of the leg of a pedestrian. The change of the structure saves materials and reduces the cost. The extrusion molding process solves the problem of high cost caused by welding and assembling of sheet metal. Simultaneously, collision crossbeam in this application can effectively reduce 1.3% quality compared with prior art.

Drawings

The invention is described in further detail below with reference to the following figures and detailed description:

FIG. 1 is a view showing an installation structure of a collision beam;

FIG. 2 is a view of a first prior art arrangement;

FIG. 3 is a cross-sectional view of a second prior art embodiment;

FIG. 4 is a cross-sectional view with linear internal bracing ribs;

FIG. 5 is a cross-sectional view of an inner brace having an inwardly concave curved shape;

in the figure: 1-collision beam body, 11-outer frame, 111-front wall, 112-rear wall, 12-inner support rib, 2-mounting bracket, 3-towing hook pipe and 4-reinforcing plate.

Detailed Description

The front collision beam provided by the invention is mainly characterized in that the section structure of the collision beam body 1 is optimized to ensure the strength of the part passing through the towing hook.

Referring to fig. 1, 4, the front impact beam of the invention includes an impact beam body 1. The collision beam body 1 includes an outer frame 11 and inner support ribs 12. The outer frame 11 with a frame-shaped section is enclosed by upper, lower, front and rear walls. The inner bracing wire 12 is supported vertically between the front wall 111 and the rear wall 112. The mounting bracket 2 fixes the impact beam body 1 to the vehicle body through the rear wall 112.

The number of the inner bracing ribs 12 is two, and the two inner bracing ribs 12 are supported and connected between the front wall 111 and the rear wall 112. The extending section of the inner supporting rib 12 and the outer frame 11 is in a shape of Chinese character mu. The two inner bracing ribs 12 have the same structure, and the cross-sectional thickness of the inner bracing rib 12 is gradually changed from the front wall 111 to the rear wall 112, the thickness of the inner bracing rib is connected with the rear wall 112, and the thin portion of the inner bracing rib is connected with the front wall 111. And the thickness of the thick part of the inner supporting rib 12 is not more than 2 times of the thickness of the thin part.

Of course, the number of the inner supporting ribs 12 is two in the present embodiment, and the number of the inner supporting ribs 12 may be modified and adjusted according to the requirement. Such as one, three, or even more.

In fig. 4, only a linear gradual change of the cross-sectional thickness is shown, but a concave curve gradual change structure as shown in fig. 5 is also possible. And the thickness of the thick part is 1.2 times of that of the thin part.

The collision beam body 1 is formed by adopting an aluminum alloy extrusion process, and the formed collision beam body 1 has no sharp point and is smooth in transition. The thickness of any position on the outer frame 11 and the inner supporting rib 12 is not less than 1.8 mm.

Through analysis, it is found that the front wall 111 and the rear wall 112 of the impact beam body 1 are deformed by different forces in traction. The deformation stress is mainly concentrated on the rear wall 112, and according to the stress analysis result, the thickness T1 of the rear wall 112 is adjusted in production, and the problem of insufficient strength of the rear wall 112 is solved by increasing the thickness T1. Meanwhile, in order to improve the safety protection of the leg of the pedestrian, the thickness T2 of the front wall 111 is adjusted in production, and the strength and rigidity of the front wall 111 are weakened by reducing the thickness T2.

Claims

1. The utility model provides a front collision crossbeam, includes collision crossbeam body (1), collision crossbeam body (1) is including outer frame (11) and interior muscle (12) that props, interior muscle (12) support between preceding, back wall (111, 112) of outer frame (11), its characterized in that, follow antetheca (111) to back wall (112), the cross-sectional thickness of interior muscle (12) thickens gradually.

2. A front impact beam according to claim 1, characterised in that said inner bracing rib (12) has a linear or concave curved gradual change in cross-sectional thickness.

3. A front impact beam according to claim 1 or 2, characterized in that the impact beam body (1) is formed by an extrusion process.

4. The front impact beam according to claim 1, characterized in that the thickness of the inner brace (12) at the thickest point is not more than 2 times the thickness at the thinnest point.

5. The front impact beam according to claim 1, characterized in that the thinnest portions of the outer frame (11) and the inner brace (12) are not less than 1.8mm thick.

6. The front impact beam of claim 4 wherein the thickness of the thick portion is 1.2 times the thickness of the thin portion.

7. A front impact beam according to claim 3, characterized in that the impact beam body (1) is free of sharp points.

8. A front impact beam according to claim 1, characterized in that the thickness of the front wall (111) is smaller than the thickness of the rear wall (112).

9. A front collision beam according to claim 1, characterized in that two of said inner bracing pieces (12) are provided in said outer frame (11), and the extending section of said collision beam body (1) is "herringbone".

10. A front impact beam according to claim 1, characterized in that said impact beam body (1) is made of aluminum alloy.