Variable-cross-section automobile door anti-collision beam

Abstract

A variable-cross-section automobile door anti-collision beam relates to the technical field of automobile door manufacturing, is an integrally formed cavity structural member with a variable cross section, and is provided with a left end part, a middle part, a right end part and a transition area; and transition areas are arranged between the left end part and the middle part and between the right end part and the middle part. Compared with a traditional sheet type thermal forming anti-collision beam, the anti-collision beam with the variable cross section has higher strength and bending resistance, compared with a tubular anti-collision beam with the same material thickness, the anti-collision beam with the variable cross section has the advantages that the bending resistance of the anti-collision beam can be guaranteed through variable cross section, variable material thickness and variable strength, meanwhile, the product weight can be effectively reduced, and due to the arrangement of a transition area, the product quality is improved. And the collision energy absorption effect is achieved, and the harm of rigid collision to the human body during vehicle collision is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile door manufacturing, in particular to a variable-section automobile door anti-collision beam. Background Art

[0002] Cars are the main means of transportation for people. Whether it is the relevant laws and regulations or the considerations of consumers when purchasing cars, they have put forward higher and higher requirements for the collision safety of cars. According to relevant statistics on traffic accidents, side collision accidents account for about 30% of the total number of accidents, and side collision accidents cause serious injuries and deaths, accounting for about 35%. Therefore, it is very necessary to improve the safety of cars in side collisions.

[0003] Door anti-collision beams are important safety components for side collision prevention of automobiles. At present, most steel door anti-collision beam structures used in the passenger car market are hot-formed sheet structures or tubular structures. In the Chinese utility model patent with publication number: CN 207028797 U and title: Door anti-collision beam, door and automobile, a sheet-type door anti-collision structure is disclosed. Due to molding limitations, this structure cannot improve the collision performance of the anti-collision beam by using a larger material thickness and material strength, and then cannot meet the use requirements of automobiles with higher collision safety requirements; in the Chinese utility model patent with publication number: CN 208006660 U and title: Door anti-collision rod structure and vehicle with the same, a tubular door anti-collision rod structure is disclosed. This structure has a single shape and is difficult to adapt to the changing door shape. It cannot be directly installed on the inner door panel and generally requires additional installation and fixing devices, which is inconvenient to use. On the other hand, it cannot meet the lightweight requirements of the automobile. Therefore, the industry is in urgent need of an automobile door anti-collision beam that can meet the requirements of automobile collision safety while meeting the requirements of automobile lightweight. Utility Model Content

[0004] The utility model aims to provide a variable-section anti-collision beam for automobile doors, which can improve the collision safety of the automobile and reduce the deadweight of the automobile.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A variable-section automobile door anti-collision beam is an integrally formed cavity structural member with a variable section, and is provided with a left end portion, a middle portion, a right end portion, and a transition region; transition regions are provided between the left end portion and the middle portion, and between the right end portion and the middle portion.

[0007] In the above-mentioned variable-section automobile door anti-collision beam, the wall thickness of the transition area is smaller than the wall thickness of the left end portion, the middle portion, and the right end portion.

[0008] The above-mentioned variable-section automobile door anti-collision beam is provided with convex ribs on the lower surface of the left end portion.

[0009] The utility model has the following advantages:

[0010] Compared with the traditional sheet-type hot-formed anti-collision beam, the variable cross-section anti-collision beam of the utility model has higher strength and bending resistance. Compared with the tubular anti-collision beam of the same material thickness, the utility model can effectively reduce the weight of the product while ensuring the bending resistance of the anti-collision beam through variable cross-section, variable material thickness, and variable strength, which meets the lightweight requirements of automobile manufacturing. The setting of the transition area plays a role in collision energy absorption, reducing the damage to the human body caused by rigid collision when the vehicle collides. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0012] Figure 2 It is a schematic diagram of the cross section at AA;

[0013] Figure 3 It is a schematic diagram of the cross section at BB;

[0014] Figure 4 It is a schematic diagram of the cross section at CC;

[0015] Figure 5 This is a schematic diagram of the installation of the door anti-collision beam on the door;

[0016] Figure 6 Schematic diagram of the location of the anti-collision beam:

[0017] The reference numerals in the figure represent: 1, left end, 2, middle, 3, right end, 4, transition area, 5, rib, L, width, H, height, d, depth. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0019] The utility model discloses a variable-section automobile door anti-collision beam, which is made by a hot steam expansion process, uses a mold, designs different closed sections at different positions according to design requirements, and effectively improves the bending resistance of the anti-collision beam by adjusting the cross-sectional shapes of different parts. The strength of different parts is achieved by different heat treatment processes, and the thickness of each position of the closed door anti-collision beam is achieved by using variable thickness steel, which ensures that the door anti-collision beam can achieve better coordinated deformation during a collision, while improving the lightweight effect of the door anti-collision beam structure.

[0020] The utility model discloses a variable cross-section anti-collision beam for automobile doors, such as Figure 6As shown, the parts enclosed by the rectangular boxes are the left end 1, the middle 2, and the right end 3, respectively, and the transition area 4 is between two adjacent rectangular boxes. The overall shape of the AA section in the middle of the anti-collision beam is in the shape of a mountain, the section width L ≥ 90mm, the section height H ≥ 40mm, the rib width is generally in the range of 15~25mm, and the depth d is in the range of 15~25mm. The width and depth of the rib are determined according to the performance requirements of the anti-collision beam during the side collision of the automobile door. Figure 3 is a cross-sectional view of the right end portion 3, Figure 4 is a cross-sectional view of the left end portion 1, Figure 3 The width of the middle section is L≥110mm, the height is H≥20mm, Figure 4 The left end section is Figure 3 Compared with the middle right end section, its height H, section width B and rib depth d are reduced. The design of the middle and end sections of the anti-collision beam is mainly to enhance the anti-bending performance of the anti-collision beam while reducing the overall weight of the anti-collision beam. The design of the end section can better improve the anti-bending performance of the end of the anti-collision beam in an environment with limited installation height. Considering the formability, the difference in the cross-sectional circumference of each part should not exceed 30%.

[0021] The utility model discloses a variable cross-section automobile door anti-collision beam, which also has the characteristic of variable material thickness. Different material thicknesses are used in different areas, which can significantly reduce the weight of the anti-collision beam while ensuring the anti-bending performance of the anti-collision beam. The material thickness of the anti-collision beam is generally controlled within the range of 1.2~3.0mm. In this example, we use a variable material thickness scheme, the material thickness in the middle of the anti-collision beam is defined as 2.0mm, the material thickness at the end is defined as 1.4mm, the material thickness in the transition area changes uniformly, and the length of the transition area is greater than or equal to 10 times the material thickness difference at both ends. In this example, the length of the material thickness area is 60mm. Under the same anti-bending performance, the variable material thickness scheme reduces the weight by 26% compared with the 2.0mm material thickness scheme.

[0022] The utility model discloses a variable-section automobile door anti-collision beam. Through the hot forming soft zone process, the soft zone strength reaches 650±100MPa during the part forming process, and the hard zone strength is within the range of 1300MPa-1700MPa. Through the arrangement of different strength areas, the energy absorption effect during vehicle collision is achieved, and the damage to drivers and passengers caused by rigid collision is reduced.

[0023] The utility model discloses a variable cross-section anti-collision beam for automobile doors, such as Figure 5 As shown, the two ends of the anti-collision beam are welded to the vehicle door and can also be installed by fasteners.

Claims

1. A variable cross-section automobile door anti-collision beam, characterized in that: The variable-section automobile door anti-collision beam is an integrally formed cavity structural member with a variable section, and is provided with a left end portion (1), a middle portion (2), a right end portion (3), and a transition region (4); a transition region (4) is provided between the left end portion (1) and the middle portion (2) and between the right end portion (3) and the middle portion (2); the wall thickness of the transition region (4) is less than the wall thickness of the left end portion (1), the middle portion (2), and the right end portion (3); the overall shape of the cross section of the middle portion of the anti-collision beam is a mountain shape, the cross section width L≥90mm, the cross section height H≥40mm, the rib width is within the range of 15-25mm, and the depth d is within the range of 15-25mm; the cross section width L≥110mm and the height H≥20mm of the right end portion of the anti-collision beam; compared with the cross section of the right end portion, the height H, cross section width B and rib depth d of the left end portion are reduced.

2. The variable cross-section automobile door anti-collision beam according to claim 1, characterized in that: A convex rib (5) is provided on the lower surface of the left end portion (1).

3. The variable cross-section automobile door anti-collision beam according to claim 1, characterized in that: The difference in cross-sectional circumferences of the middle and end portions of the door anti-collision beam shall not exceed 30%.

4. The variable cross-section automobile door anti-collision beam according to claim 1, characterized in that: The door anti-collision beam also has the characteristic of variable material thickness. Different material thicknesses are used in different areas. The material thickness in the middle of the anti-collision beam is defined as 2.0 mm, the material thickness at the end is defined as 1.4 mm, and the material thickness in the transition area changes evenly.

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