A connecting structure for an automobile aluminum alloy floor beam

Abstract

A connecting structure for an automobile aluminum alloy floor beam is provided with a first connecting piece and a second connecting piece; the first connecting piece is a hollow cavity structure, provided with an arc-shaped top surface extending to the front and back sides, and is connected to a first cross beam by spot welding through the arc-shaped top surface front side extension, cavity front side wall and cavity bottom surface, and is connected to the end of a longitudinal beam by spot welding through the arc-shaped top surface rear side extension and cavity rear side wall; the second connecting piece is a T-shaped hollow shell, the upper and lower ends of which are open structures, and longitudinal beam through grooves and cross beam through grooves are arranged on the side walls thereof, the longitudinal beam penetrates through the longitudinal beam through grooves, and the left and right side walls of the longitudinal beam are spot welded to the longitudinal inner walls of the T-shaped hollow shell, and the end of the second cross beam penetrates through the cross beam through grooves, and the front and back side walls of the second cross beam are spot welded to the transverse inner walls of the T-shaped hollow shell. The present application realizes reliable connection of parts in the aluminum alloy floor beam assembly, and achieves the purpose of meeting the connection strength of the automobile floor beam and the requirements of light weight and low cost.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of automobile floor beams, especially a kind of connecting structure for automobile aluminum alloy floor beam. BACKGROUND

[0002] At present, in automobile floor beam assembly, cross beam and longitudinal beam are generally steel plate stamping forming piece, and the connection between cross beam and longitudinal beam is realized by spot welding process. With the continuous deepening of the concept of lightweight design of automobile, in order to better reduce the weight of vehicle body, aluminum alloy material is selected in the design of vehicle body floor beam structure.

[0003] As shown in the accompanying Figure 1 , Figure 2 , Figure 3 After using aluminum alloy material for automobile floor beam parts, if the connection mode similar to steel stamping forming piece (i.e. the first cross beam 1, the second cross beam 3 and the longitudinal beam 2 are connected by spot welding process) is still used, in order to ensure the connection strength, 3-5 spot welding connection surfaces are generally provided, so the second cross beam 3 and the longitudinal beam 2 end flanging are bent to form the joint surface with the longitudinal beam 2 or the first cross beam 1. Since aluminum alloy material is easy to have micro-cracks or cracks in the bending deformation process, the risk of fracture is caused, so process gap 4 is designed between the flanging welding surface of the second cross beam 3 and the longitudinal beam 2 end and the welding surface, which greatly reduces the strength of the second cross beam 3 and the longitudinal beam 2 end.

[0004] As shown in the accompanying Figure 4 In order to solve the above problems and improve the strength of the second cross beam 3 and the longitudinal beam 2 end of aluminum alloy, it is conceived to add first cast aluminum connecting piece 5 and second cast aluminum connecting piece 6 at the connecting parts of longitudinal beam 2 and first cross beam 1, second cross beam 3 and longitudinal beam 2, and weld and assemble first cross beam 1, longitudinal beam 2 and second cross beam 3 through first cast aluminum connecting piece 5 and second cast aluminum connecting piece 6. However, due to the problems of large weight and low strength (the yield strength of cast aluminum part is about 200 MPa) of cast aluminum connecting piece, and the high cost of casting process, it is difficult to meet the requirements of connection strength, lightweight and low cost of automobile floor beam assembly. SUMMARY

[0005] The present application provides a kind of connecting structure for automobile aluminum alloy floor beam, which aims to realize the reliable connection of parts in aluminum alloy floor beam assembly by adding extruded aluminum connecting piece, to ensure the connection strength of automobile floor beam and meet the design requirements of lightweight and low cost.

[0006] To achieve the above purpose, the present application adopts the following technical solutions:

[0007] A connecting structure for automobile aluminum alloy floor beam, which is provided with a first connecting piece at the joint between a first cross beam and a longitudinal beam end, and a second connecting piece at the joint between a second cross beam and a longitudinal beam middle; the first connecting piece is a hollow cavity structure, provided with an arc-shaped top surface extending to the front and back sides, and is connected to the first cross beam by spot welding through the arc-shaped top surface front side extension, cavity front side wall and cavity bottom surface, and is connected to the longitudinal beam end by spot welding through the arc-shaped top surface rear side extension, cavity rear side wall; the second connecting piece is a T-shaped hollow shell, with its upper and lower ends being open structure, and provided with a longitudinal beam through groove and a cross beam through groove on its side wall, the longitudinal beam penetrates through the longitudinal beam through groove, and the left and right side walls of the longitudinal beam are spot welded to the longitudinal inner wall of the T-shaped hollow shell, and the end of the second cross beam penetrates through the cross beam through groove, and the front and back side walls of the second cross beam are spot welded to the transverse inner wall of the T-shaped hollow shell.

[0008] In the above connecting structure for automobile aluminum alloy floor beam, in the second connecting piece, the welding surface of the longitudinal inner wall of the T-shaped hollow shell and the transverse inner wall of the T-shaped hollow shell is a convex structure protruding inward.

[0009] In the above connecting structure for automobile aluminum alloy floor beam, a reinforcing rib plate is arranged in the hollow cavity of the first connecting piece, which is perpendicular to the arc-shaped top surface, and divides the hollow cavity of the first connecting piece into two parts, i.e. a first cavity and a second cavity.

[0010] In the above connecting structure for automobile aluminum alloy floor beam, the front side wall of the first cavity of the first connecting piece and the arc-shaped top surface front side extension are both transversely widened structures.

[0011] In the above connecting structure for automobile aluminum alloy floor beam, the first connecting piece and the second connecting piece are both made of aluminum alloy material, and are formed into strip-shaped profiles matched with the structure of the first connecting piece or the second connecting piece by extrusion process, and are divided into a plurality of first connecting piece or second connecting piece blank pieces from the strip-shaped profiles, and are finally formed into the first connecting piece or the second connecting piece by machining.

[0012] The application provides a connecting structure for an automobile aluminum alloy floor beam, which can reliably connect each part in an automobile aluminum alloy floor beam assembly by matching an aluminum alloy spot welding process through a first connecting piece arranged at a first beam and longitudinal beam end joint, a second connecting piece arranged at a second beam and longitudinal beam middle joint, in terms of material, the first connecting piece and the second connecting piece are both made of aluminum alloy material, the yield strength of the material can generally reach above 280 MPa, which is 40%-100% higher than the strength of a cast aluminum connecting piece and the strength of a beam and longitudinal beam plate; in terms of structure, the first connecting piece is a cavity structure, the cavity axis is parallel to the first beam, and the second connecting piece is a T-shaped hollow shell, both of which have high cross-sectional stiffness and are not easy to bend and deform, in addition, the hollow structure of the first connecting piece and the second connecting piece is beneficial to reducing the weight of the part; in terms of manufacturing process, the first connecting piece and the second connecting piece can be first formed into a strip-shaped profile through an extrusion process, and then the manufacturing process of a single part is completed through segmentation and machining, because the extrusion forming die has a development cost far lower than that of a casting die and a development cycle only 1 / 3 of that of a casting piece, and the energy consumption in the forming process is low, which meets the low-carbon requirement. In summary, the application realizes reliable connection of parts in an aluminum alloy floor beam assembly, and achieves the purposes of ensuring the connection strength of an automobile floor beam and meeting the requirements of light weight and low cost. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a connecting structure schematic diagram of an automobile aluminum alloy floor beam in the prior art by spot welding;

[0014] Figure 2 is Figure 1 is an enlarged view of structure I in FIG. 1;

[0015] Figure 3 is Figure 1 is an enlarged view of structure II in FIG. 1;

[0016] Figure 4 is a connecting structure schematic diagram of an automobile aluminum alloy floor beam in the prior art by a cast aluminum connecting piece;

[0017] Figure 5 is a connecting structure schematic diagram of an automobile aluminum alloy floor beam in the application;

[0018] Figure 6 is Figure 5 is an enlarged view of structure III in FIG. 2;

[0019] Figure 7 is a first connecting piece structure schematic diagram;

[0020] Figure 8 is Figure 5 is an enlarged view of structure IV in FIG. 2;

[0021] Figure 9This is a schematic diagram of the second connector structure.

[0022] Explanation of each label in the diagram:

[0023] 1 is the first crossbeam; 2 is the longitudinal beam; 3 is the second crossbeam; 4 is the process notch; 5 is the first cast aluminum connector; 6 is the second cast aluminum connector; 7 is the first connector, 7-1 is the arc-shaped top surface, 7-2 is the first cavity, 7-3 is the reinforcing rib, 7-4 is the second cavity; 8 is the second connector, 8-1 is the longitudinal beam through slot, 8-2 is the crossbeam through slot, 8-3 is the longitudinal inner wall of the T-shaped hollow shell, 8-4 is the transverse inner wall of the T-shaped hollow shell. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] See Figure 5 The connection structure for automotive aluminum alloy floor beams of the present invention includes a first connector 7 at the end joint of the first crossbeam 1 and the longitudinal beam 2, and a second connector 8 at the middle joint of the second crossbeam 3 and the longitudinal beam 2. Both the first connector 7 and the second connector 8 are made of aluminum alloy. They are first formed into strip profiles that match the structure of the first connector or the second connector through an extrusion process. Then, the strip profiles are divided into several blanks of the first connector 7 or the second connector 8. Finally, the first connector 7 or the second connector 8 is formed by machining.

[0026] See Figure 5 , Figure 6 , Figure 7 The connecting structure for automotive aluminum alloy floor beams of the present invention has a first connecting member 7 as a hollow cavity structure, with an arc-shaped top surface 7-1 extending forward and backward, and a reinforcing rib 7-3 provided in the hollow cavity. The reinforcing rib 7-3 is perpendicular to the arc-shaped top surface 7-1. The reinforcing rib 7-3 divides the hollow cavity of the first connecting member 7 into two parts: a first cavity 7-2 and a second cavity 7-4. The front side wall of the first cavity 7-2 and the front extension of the arc-shaped top surface 7-1 are both laterally widened structures. The first connecting member 7 is spot-welded to the first crossbeam 1 through the front extension of the arc-shaped top surface 7-1, the front side wall of the first cavity 7-2, and the bottom surface of the first cavity 7-2. It is spot-welded to the end of the longitudinal beam 2 through the rear extension of the arc-shaped top surface 7-1 and the rear side wall of the second cavity 7-4.

[0027] See Figure 5 , Figure 8 , Figure 9The connecting structure for the automobile aluminum alloy floor beam has the second connecting piece 8 being a T-shaped hollow shell, the upper and lower ends being open structures, the longitudinal beam through groove 8-1 and the transverse beam through groove 8-2 being arranged on the side wall of the T-shaped hollow shell, the longitudinal beam 2 penetrating through the longitudinal beam through groove 8-1, the left and right side walls of the longitudinal beam 2 being spot-welded to the longitudinal inner wall 8-3 of the T-shaped hollow shell, the end of the second transverse beam 3 penetrating through the transverse beam through groove 8-2, the front and rear side walls of the second transverse beam 3 being spot-welded to the transverse inner wall 8-4 of the T-shaped hollow shell, and the welding surfaces of the longitudinal inner wall 8-3 of the T-shaped hollow shell and the transverse inner wall 8-4 of the T-shaped hollow shell being outwardly convex boss structures.

[0028] Referring to Figures 1 to 9 After the automobile floor beam part is made of aluminum alloy material, in order to overcome the disadvantages of the connecting mode of the steel stamping forming part as shown in Figures 1 to 3 and the connecting mode of the cast aluminum connecting piece as shown in Figure 4 , the application provides a connecting structure for an automobile aluminum alloy floor beam, which is characterized in that a first connecting piece 7 is arranged at the joint between the end of the first transverse beam 1 and the longitudinal beam 2, the first connecting piece 7 is spot-welded to the first transverse beam 1 through the front side extension of the arc-shaped top surface 7-1, the front side wall of the first cavity 7-2 and the bottom surface of the first cavity 7-2, and is spot-welded to the end of the longitudinal beam 2 through the rear side extension of the arc-shaped top surface 7-1 and the rear side wall of the second cavity 7-4, so as to realize the reliable connection between the longitudinal beam 2 and the first transverse beam. The second connecting piece 8 arranged at the joint between the second transverse beam 3 and the middle part of the longitudinal beam 2 can make the longitudinal beam 2 penetrate through the longitudinal beam through groove 8-1 of the second connecting piece 8, and spot-weld the left and right side walls of the longitudinal beam 2 to the longitudinal inner wall 8-3 of the T-shaped hollow shell, at the same time, the end of the second transverse beam 3 penetrates through the transverse beam through groove 8-2 of the second connecting piece 8, and the front and rear side walls of the second transverse beam 3 are spot-welded to the transverse inner wall 8-4 of the T-shaped hollow shell, so as to realize the reliable connection between the longitudinal beam 2 and the second transverse beam 3.

Claims

1. A connecting structure for an automobile aluminum alloy floor beam, characterized by: It is provided with a first connecting piece (7) at the joint of the first cross beam (1) and the longitudinal beam (2) end, and a second connecting piece (8) at the joint of the second cross beam (3) and the longitudinal beam (2) middle; the first connecting piece (7) is a hollow cavity structure, provided with an arc-shaped top surface (7-1) extending to the front and back sides, connected with the first cross beam (1) by the front side extension of the arc-shaped top surface (7-1), the cavity front side wall and the cavity bottom surface, and connected with the longitudinal beam (2) end by the rear side extension of the arc-shaped top surface (7-1), the cavity rear side wall; the second connecting piece (8) is a T-shaped hollow shell, with the upper and lower ends being open structures, provided with a longitudinal beam passing groove (8-1) and a cross beam passing groove (8-2) on the side wall, the longitudinal beam (2) passing through the longitudinal beam passing groove (8-1), the left and right side walls of the longitudinal beam (2) being connected with the longitudinal inner wall (8-3) of the T-shaped hollow shell by spot welding, and the end of the second cross beam (3) passing through the cross beam passing groove (8-2), the front and rear side walls of the second cross beam (3) being connected with the transverse inner wall (8-4) of the T-shaped hollow shell by spot welding.

2. The connecting structure for an automobile aluminum alloy floor beam according to claim 1, characterized by: In the second connecting piece (8), the welding surfaces of the longitudinal inner wall (8-3) of the T-shaped hollow shell and the transverse inner wall (8-4) of the T-shaped hollow shell are convex boss structures.

3. The connecting structure for an automobile aluminum alloy floor beam according to claim 1 or 2, characterized by: A reinforcing rib plate (7-3) is arranged in the hollow cavity of the first connecting piece (7), the reinforcing rib plate (7-3) being perpendicular to the arc-shaped top surface (7-1), and the hollow cavity of the first connecting piece (7) being divided into a first cavity (7-2) and a second cavity (7-4) by the reinforcing rib plate (7-3).

4. The connecting structure for an automobile aluminum alloy floor beam according to claim 3, characterized by: The front side wall of the first cavity (7-2) of the first connecting piece (7) and the front side extension of the arc-shaped top surface (7-1) are both transversely widened structures.

5. The connecting structure for an automobile aluminum alloy floor beam according to claim 4, characterized by: The first connecting piece (7) and the second connecting piece (8) are both made of aluminum alloy material, formed into strip-shaped profiles matched with the structures of the first connecting piece or the second connecting piece by an extrusion process, divided into a plurality of blank pieces of the first connecting piece (7) or the second connecting piece (8) from the strip-shaped profiles, and finally formed into the first connecting piece (7) or the second connecting piece (8) by machining.

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