Mortise and tenon welding aluminum alloy fuel tank

Abstract

The utility model discloses a mortise and tenon welding aluminum alloy fuel tank which comprises a tank body, an end plate, a partition plate, a sealing plate and a welding pad, the tank body, the end plate, the partition plate and the welding pad are all machined and formed by aluminum alloy thin plates, the sealing plate comprises a top plate and a bent plate, and a mortise and tenon welding structure is adopted between the top plate and the bent plate. The connecting structure between the sealing plate and the fuel tank also adopts a mortise and tenon welding structure, so that the direct stress of welding seams and the intersection of a plurality of welding seams in the original fuel tank scheme are avoided, the stress concentration and welding deformation at the notch position in the fuel tank are reduced, and the quality of the fuel tank is comprehensively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle fuel tank structures, and particularly relates to a mortise and tenon welded aluminum alloy fuel tank. Background Art

[0002] With the development of the automotive industry, the use of aluminum alloy fuel tanks in vehicles has gradually increased, primarily due to their ability to improve vehicle lightweighting. A certain vehicle's fuel tank, constructed from multiple thin aluminum alloy parts welded together, cracked and leaked during a race car test. Observation revealed that the primary cracking location was at the corner of the notch. The appearance of the sealing plate at the notch is shown in the figure below. The cause of the cracking was analyzed as follows:

[0003] 1. The sealing plate at the crack is a thin aluminum alloy plate that has been formed after multiple bending and welding processes and then corrected. The parts themselves, especially at the corners, have large stress concentration.

[0004] 2. The aluminum alloy fuel tank adopts the consumable electrode welding method, and its weld strength is about 60% of the parent material. The welding quality depends on the personal level of the operator, and the weld quality is difficult to guarantee.

[0005] 3. The vibration of the road conditions where the vehicle is used is indeed quite severe, and the stress-bearing structure of the parts here is directly borne by the welds, and because they are welded with thin aluminum alloy plates, the weld cross-section is small.

[0006] The current solution involves adding additional steps to extend bends and reduce welds at corners; inspecting and testing welds, and repairing unsatisfactory welds. This is cumbersome and unsuitable for high-volume production and urgent tasks. Utility Model Content

[0007] In order to overcome the shortcomings of the above-mentioned prior art, the utility model provides a mortise and tenon welded aluminum alloy fuel tank, which has high reliability, avoids the multiple welded structures and direct stress on the welds at the corners of the notch, reduces stress concentration at the location, and improves the quality of the aluminum alloy fuel tank.

[0008] The technical solution adopted by the utility model is as follows: a mortise and tenon welded aluminum alloy fuel tank, comprising a tank body, end plates, partitions, sealing plates and welding pads, characterized in that the connection between the sealing plate, the end plates and the tank body adopts a mortise and tenon welding structure.

[0009] Furthermore, the end plate is divided into a left end plate and a right end plate, which are respectively installed at the two ends of the box body, and the end plate and the box body are connected by welding; the partition is directly welded to the inside of the box body; the welding pad is assembled at the overlap between the end plate and the box body; the closing plate is composed of a top plate and a bent plate, the bent plate is provided with an L-shaped tenon and a U-shaped tenon with a rectangular cross-section, and the upper and lower surfaces of the top plate are provided with an L-shaped tenon with a rectangular cross-section, the tenon at the top of the bent plate is embedded in the tenon at the bottom of the top plate, and then the bent plate and the top plate are assembled into a closing plate by welding; the aluminum alloy sheet at the notch between the box body and the end plate is used as a tenon to be embedded in the tenon of the closing plate, and then the box body, end plate and closing plate are assembled into a fuel tank by welding.

[0010] The beneficial effects of the present invention are as follows: the sealing plate in the present invention adopts a mortise and tenon welding structure, which avoids the many bending, shearing and welding processes in the existing sealing plate forming process, reduces the stress and welding deformation of the parts themselves, and reduces the workload of parts correction; the mortise and tenon welding structure adopted between the sealing plate and the box body and end plate avoids the direct stress on the welds and the intersection of multiple welds in the existing technology, reduces the stress concentration and welding deformation at this position in the fuel tank, and improves the quality of the fuel tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the fuel tank of the utility model;

[0012] Figure 2 This is a schematic diagram of the assembly of the box body and the partition of the utility model;

[0013] Figure 3 This is a schematic diagram of the assembly of the welding pad of the utility model;

[0014] Figure 4 This is a schematic diagram of the box structure of the utility model;

[0015] Figure 5 This is a schematic diagram of the partition structure of the utility model;

[0016] Figure 6 This is a schematic diagram of the end plate structure of the utility model;

[0017] Figure 7 This is a schematic diagram of the end plate structure of the utility model;

[0018] Figure 8 This is a schematic diagram of the sealing plate structure of the utility model;

[0019] Figure 9 This is a schematic diagram of the top plate structure of the utility model;

[0020] Figure 10 It is a schematic diagram of the bent plate structure of the present utility model.

[0021] The markings in the figure are: 1. Box body, 2. Closing plate, 3. End plate, 4. Box body joint, 5. Welding pad, 6. Notch, 7. Interface, 8. Oil through hole, 9. Notch, 10. Top plate, 11. Bent plate, 12. L-shaped mortise, 13. L-shaped mortise, 14. I-shaped mortise, 15. L-shaped tenon, 16. U-shaped mortise. DETAILED DESCRIPTION

[0022] like Figure 1-10 As shown, the utility model includes a box body 1, a sealing plate 2, an end plate 3, a partition, and a welding pad 5. The assembly order is to first install the partition and the welding pad 5 into the box body by welding; then embed the end plate 3 and the thin aluminum alloy plate of the box body notch 9 into the mortise and tenon of the sealing plate 3, and weld the mortise and tenon joints; finally, assemble the end plate 3 on the other side of the fuel tank.

[0023] The box body is made of aluminum alloy sheet bent into a square shape, and a certain gap is set at the joint, which can be used for I-shaped gap groove; the box body is provided with a notch at the connection position with the cover plate, and the thin aluminum alloy sheet at this position can be used as a tenon to be embedded in the tenon groove of the cover plate; the box body is also provided with an interface for connecting the fuel tank to the vehicle oil circuit, as shown in the following figure. Figure 4 As shown, 6 is a notch and 7 is an interface.

[0024] The end plate 3 is composed of two pieces, which are respectively assembled on both sides of the box body. A notch is provided on one side of the end plate, and the thin aluminum alloy plate there is used as a tenon to be embedded in the tenon groove of the sealing plate. Figure 6 shown.

[0025] The welding pads are multiple thin aluminum alloy strips with the same cross-section, which are respectively assembled at the end plate and the box body, and the box body bending joint. They are provided with grooves to prevent the welding slag and other waste products from entering the fuel tank during the welding of the box body, the end plate, and the box body bending joint. Figure 3 shown.

[0026] The partition is a thin aluminum alloy flat plate with a square notch for the welding pad and multiple through holes 8 for oil flow, which can increase the path of oil circulation, facilitate the cooling and heat dissipation of fuel, bubble precipitation and impurity precipitation, such as Figure 5 shown.

[0027] The sealing plate 2 is composed of a top plate 10 and a bent plate 11. The sealing plate 2 is provided with a circle of mortise and tenon grooves corresponding to the notch of the fuel tank, which can be used to fit the thin plates at the notch of the tank body and the end plate. The sealing plate is assembled by welding the mortise and tenon joints. Figure 9 The structure and function of the top plate and the bent plate are as follows:

[0028] The top plate is formed by thick aluminum alloy plate, and its upper and lower surfaces are provided with L-shaped track-shaped grooves. The L-shaped mortise and tenon groove on the upper surface can be extended to the two sides of the top and form an I-shaped mortise and tenon groove on the side of the top plate. The depth of the I-shaped mortise and tenon groove on the side is the same as that of the L-shaped mortise and tenon groove, which can be used as the interface of the mortise and tenon connection between the cover plate and the end plate and the box body. The L-shaped mortise and tenon groove on the lower surface can be used as the interface of the mortise and tenon connection between the top plate and the bent plate. Figure 9 shown.

[0029] The bent plate is processed and bent by aluminum alloy thick plate, with a circle of U-shaped mortise on the outside, which corresponds to the mortise on both ends of the L-shaped mortise on the top plate, and can serve as the interface for the mortise and tenon connection between the cover plate and the end plate and the box body; the top is provided with an L-shaped tenon, which can be used as the interface for the mortise and tenon connection between the bent plate, as shown in the following figure. Figure 10 shown.

[0030] The principle of the present invention is that a mortise and tenon welding structure is adopted between the parts constituting the closing plate, which can be specifically expressed as a mortise and tenon connection between the top plate and the bent plate through the L-shaped mortise and tenon groove on the lower surface of the top plate and the L-shaped mortise and tenon groove on the upper surface of the bent plate, and the assembly is completed by welding, which avoids the many bending, shearing and welding processes in the closing plate forming process in the original scheme, reduces the stress and welding deformation of the parts themselves, and reduces the workload of part correction; a mortise and tenon welding structure is also adopted between the closing plate and the box body and the end plate, which can be specifically expressed as a thin aluminum alloy plate at the notch of the end plate and the box body can be embedded in the L-shaped mortise and tenon groove on the upper surface of the top plate, the I-shaped mortise and tenon groove on the side and the U-shaped mortise and tenon groove on the outer side of the bent plate, and the assembly is completed by welding, which has reliable connection quality and high structural strength, avoids the direct force on the weld and the intersection of multiple welds in the original scheme, reduces the stress concentration and welding deformation at this position in the fuel tank, and improves the quality of the fuel tank.

Claims

1. A mortise and tenon welded aluminum alloy fuel tank, comprising a tank body, end plates, partitions, sealing plates and welding pads, characterized in that The connection between the cover plate, the end plate and the box body adopts a mortise and tenon welding structure.

2. The mortise and tenon welded aluminum alloy fuel tank according to claim 1, characterized in that: The end plates are divided into left and right end plates, which are respectively installed at the two ends of the box body, and the end plates and the box body are connected by welding; the partitions are directly welded to the inside of the box body; the welding pads are installed at the overlaps between the end plates and the box body; the closing plate is composed of a top plate and a bent plate, and the bent plate is provided with an L-shaped tenon and a U-shaped tenon with a rectangular cross-section, and the upper and lower surfaces of the top plate are provided with an L-shaped tenon with a rectangular cross-section, and the tenon at the top of the bent plate is embedded in the tenon at the bottom of the top plate, and then the bent plate and the top plate are assembled into a closing plate by welding; the aluminum alloy sheet at the notch between the box body and the end plate is used as a tenon to be embedded in the tenon of the closing plate, and then the box body, end plate and closing plate are assembled into a fuel tank by welding.

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