Water-drop-shaped aluminum alloy roof rack
By designing a water droplet type aluminum alloy roof rack, optimizing the appearance and structure, combined with electrophoretic powdering surface treatment technology, the wind resistance, wind noise, weight and corrosion resistance of the existing roof rack is solved, and a more efficient and safer roof rack design is achieved.
Patent Information
- Application Number
- CN202422028823.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-20
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-08-20
AI Technical Summary
The existing aluminum alloy roof rack has problems such as large wind resistance coefficient, obvious wind noise, heavier weight, poor surface treatment performance, and easy deformation and cracking of plastic corner parts, which affect user experience and safety.
A water droplet type aluminum alloy roof rack is designed, and the flow guide design is adopted to reduce wind resistance by optimizing the appearance design and assembly line shape arc; the wall thickness and profile cross-sectional structure are optimized to reduce weight when meeting the load-bearing performance; the surface treatment process of electrophoresis combined with powder spray is adopted, and the Aksu powder coating is used to improve the coating adhesion and corrosion resistance.
It achieves a smaller wind resistance coefficient and lower wind noise, further reducing weight, improving the corrosion resistance and service life of the surface treatment, and improving the safety and user experience of the product.
Smart Images
Figure CN222973306U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of roof rack structures, in particular to an aluminum alloy roof rack in a water droplet shape. Background Art
[0002] At present, the roof racks applied to the roofs of automobiles are commonly used for self-driving tours, capable of carrying luggage and increasing the storage space in the vehicle, and are mainly applied to SUVs and off-road vehicle models. The traditional roof rack adopts a steel structure with a relatively high weight. After installing the steel structure roof rack on the vehicle, the weight of the whole vehicle increases significantly, which is not conducive to the lightweight of the vehicle. And the currently popular roof racks are basically aluminum alloy roof racks in order to reduce weight, etc. The aluminum alloy structure reduces the weight by about 40% compared with the steel structure, and at the same time does not reduce its load capacity. The matching aluminum alloy roof rack for the vehicle is one of the important ways to achieve the lightweight of the vehicle. However, there are generally some problems with the aluminum alloy roof racks on the market at present, which are specifically as follows: (1) The surface coating performance of the roof rack products is weak. The surface treatment process generally adopts the painting process, the hardness of the paint layer is low, it is easy to be scratched and lose paint, the paint layer of the painted product is easy to blister and crack, and the performance and stability of the coating are poor, resulting in poor corrosion resistance. (2) The shapes of most roof racks are square without smooth transitions, lacking aesthetic feeling. When the wind flows through the surface of the aluminum alloy roof rack, there is flow interference, the wind resistance coefficient is large, and the wind noise is very obvious under actual vehicle conditions, and the user experience is poor. (3) The aluminum alloy roof rack is basically a welded integral roof rack structure. Once installed, it cannot be disassembled, and the replacement and maintenance costs are relatively high. Moreover, the transportation packaging occupies a large space, and the user cannot put the aluminum alloy roof rack into the vehicle for transportation. (4) Except that the main frame of the aluminum alloy roof rack is made of aluminum alloy structure, bent corners are often installed at the four corners of the aluminum alloy roof rack respectively. These four bent corners are plastic parts. The plastic parts are directly connected to the profiles on both sides of the aluminum alloy roof rack. Therefore, the plastic parts need to bear a certain load. When subjected to a large impact load, the plastic parts are at risk of deformation and cracking, there are certain potential safety hazards, and the safety performance is poor.
[0003] In view of the above technical defect problems, the applicant has also previously developed and applied for a Chinese patent for an aluminum alloy roof rack, which can solve the above technical problems. However, in actual use of this patent structure, there are still technical problems that need to be further optimized and solved, which are as follows: (1) How to further reduce the wind resistance coefficient and wind noise of the roof rack. (2) How to further reduce the weight while meeting the load-bearing performance and the aluminum alloy roof rack of the same specification, and achieve a better lightweight design. (3) How to further improve the physical properties and corrosion resistance of the surface treatment coating of the roof rack.
[0004] Therefore, it is necessary to improve the structure of the existing roof rack to address the problems of the prior art. Summary of the Invention
[0005] The purpose of the present utility model is to overcome the above-mentioned drawbacks of the prior art and provide an aluminum alloy roof rack in a water droplet shape. This aluminum alloy roof rack in a water droplet shape is lighter in weight, higher in strength, better in corrosion resistance, lower in wind noise, etc. The windward side of this aluminum alloy roof rack further optimizes the external shape design and the shape curvature of the streamline, and is designed into a shape similar to a water droplet and a flow guiding design, achieving a smaller wind resistance coefficient and lower wind noise. Under the condition of meeting the load-bearing performance and the aluminum alloy roof rack of the same specifications, the wall thickness, the cross-sectional structure of the aluminum alloy profile, and the external shape of the aluminum alloy roof rack are optimized, realizing further weight reduction and achieving a more optimized lightweight purpose. When the surface treatment of the aluminum alloy roof rack adopts the surface treatment process of electrophoresis combined with powder spraying, a coating layer that can further improve the coating adhesion ability, physical properties, and corrosion resistance performance is used, further improving the corrosion resistance performance and achieving the purpose of a longer service life and maintaining a beautiful appearance for a long time.
[0006] The technical solution adopted by the present utility model to solve its technical problems is: an aluminum alloy roof rack in a water droplet shape, including an aluminum alloy outer frame formed by assembling an aluminum alloy front frame bar, an aluminum alloy rear frame bar, an aluminum alloy left frame bar, and an aluminum alloy right frame bar into a square shape, and four plastic corner pieces respectively installed at the four corner positions of the aluminum alloy outer frame, several longitudinal bars installed between the aluminum alloy front frame bar and the aluminum alloy rear frame bar and evenly spaced, and several cross bars installed between the aluminum alloy left frame bar and the aluminum alloy right frame bar and evenly spaced and connected to all the longitudinal bars. The cross-section of the aluminum alloy front frame bar is in a water droplet shape structure, and the front end of the aluminum alloy front frame bar is the windward side; the front end of the aluminum alloy front frame bar is semi-elliptical, the middle position is flat, and the rear end is a pointed shape formed by gradually narrowing; the plastic corner piece is inserted and installed on the side of the aluminum alloy front frame bar, and the outer side of the plastic corner piece is a semi-elliptical arc surface matching the semi-elliptical shape of the aluminum alloy front frame bar; the outer sides of the aluminum alloy left frame bar and the aluminum alloy right frame bar are both elliptical arc surfaces matching the semi-elliptical arc surface shape of the plastic corner piece.
[0007] Furthermore, the aluminum alloy outer frame, the longitudinal bars, and the cross bars are all hollow aluminum alloy profile structures, and the wall thickness formed between the aluminum alloy profile structure and the hollow space is 12 - 15 mm; the height of the middle position of the aluminum alloy front frame bar is 48 - 50 mm; after the longitudinal bars and the cross bars are installed in the aluminum alloy outer frame, they do not protrude outward and are not higher than the maximum height of the aluminum alloy front frame bar.
[0008] Furthermore, the semi-elliptical shape at the front end of the aluminum alloy front frame bar is composed of two symmetrically arranged upper and lower first arc surfaces. The first arc surface is composed of five arcs, and the radii of each arc of the first arc surface are 43.5 mm, 44.5 mm, 43 mm, 19 mm, and 13 mm respectively; the pointed shape at the rear end of the aluminum alloy front frame bar is composed of two symmetrically arranged upper and lower second arc surfaces. The second arc surface is composed of four arcs, and the radii of each arc of the second arc surface are 37.5 mm, 280.5 mm, 23 mm, and 5 mm respectively.
[0009] Furthermore, a longitudinal rod installation groove is provided on the second arc surface above the rear end of the aluminum alloy front frame bar, and a rear frame bar installation groove is provided by being recessed downward above the front end of the aluminum alloy rear frame bar; the front end of the longitudinal rod is embedded and installed in the longitudinal rod installation groove, and the rear end of the longitudinal rod is installed in the rear frame bar installation groove, and the top surface of the longitudinal rod does not protrude from the top surface of the middle position of the aluminum alloy front frame bar; the cross bar is fitted and installed at the bottom of the longitudinal rod, and the bottom surface of the cross bar does not protrude from the bottom surface of the middle position of the aluminum alloy front frame bar.
[0010] Furthermore, the aluminum alloy left frame bar and the aluminum alloy right frame bar are symmetrically arranged inverted L-shaped hollow profile structures, and a frame bar installation groove is provided by being recessed downward on the second arc surface above the rear end of the aluminum alloy front frame bar; the front ends of the aluminum alloy left frame bar and the aluminum alloy right frame bar are both embedded and installed in the frame bar installation groove, and the rear ends of the aluminum alloy left frame bar and the aluminum alloy right frame bar are both embedded and installed in the rear frame bar installation groove; the top surfaces after the installation of the aluminum alloy left frame bar and the aluminum alloy right frame bar form a horizontally flat plane with the top surface of the middle position of the aluminum alloy front frame bar.
[0011] Furthermore, screw installation grooves are provided on the top surface of the aluminum alloy outer frame, the longitudinal rod, and the bottom surface of the cross bar. Screws are installed by being slid into the screw installation grooves, and the various frame bars of the aluminum alloy outer frame, the longitudinal rod, and the cross bar are fixedly installed through screws and nuts, and the screws and nuts are in a non-exposed state.
[0012] Furthermore, four longitudinal rods are provided, and three cross bars are provided; the surfaces of the aluminum alloy outer frame, the longitudinal rod, and the cross bar are covered with an Akzo powder coating by means of an electrophoretic coating combined with powder spraying.
[0013] Furthermore, the total weight of the aluminum alloy outer frame, the four plastic corner pieces, the four longitudinal rods, and the three cross bars is 15 kg.
[0014] Furthermore, plugs are provided at both ends of the plastic corner piece, slots are provided at the four corner positions of the aluminum alloy outer frame corresponding to the plugs, and convex pressing heads are provided on the side of the plug and protrude outward and press the inner wall surface of the slot after being inserted into the slot.
[0015] In summary, the water-drop-shaped aluminum alloy roof luggage rack of the present utility model is an aluminum alloy roof luggage rack with lighter weight, higher strength, better corrosion resistance, lower wind noise, etc. The windward side of the aluminum alloy luggage rack further optimizes the shape design and the shape radian of the streamline, and is designed into a shape similar to a water-drop shape and a flow guiding design, achieving a smaller wind resistance coefficient and lower wind noise; under the condition of meeting the load-bearing performance and the aluminum alloy roof luggage rack of the same specification, the wall thickness, the cross-sectional structure and the shape of the aluminum alloy profile of the aluminum alloy roof luggage rack are optimized, realizing further weight reduction and achieving a more optimized lightweight purpose; when the surface treatment of the aluminum alloy roof rack adopts the surface treatment process of electrophoresis combined with powder spraying, a coating layer that can better improve the coating adhesion ability, physical properties and corrosion resistance performance is used, further improving the corrosion resistance performance and achieving the purpose of longer service life and maintaining a beautiful appearance for a long time. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is an exploded schematic view of a water-drop-shaped aluminum alloy roof luggage rack according to Embodiment 1;
[0017] Figure 2 is a three-dimensional schematic view of a water-drop-shaped aluminum alloy roof luggage rack according to Embodiment 1;
[0018] Figure 3 is a front view schematic view of a water-drop-shaped aluminum alloy roof luggage rack according to Embodiment 1;
[0019] Figure 4 is a top view schematic view of a water-drop-shaped aluminum alloy roof luggage rack according to Embodiment 1;
[0020] Figure 5 is a left view schematic view of a water-drop-shaped aluminum alloy roof luggage rack according to Embodiment 1;
[0021] Figure 6 is a cross-sectional schematic view of the aluminum alloy front frame bar according to Embodiment 1;
[0022] Figure 7 is a cross-sectional schematic view of the front frame bar of the luggage rack in the prior art;
[0023] Figure 8 is an installation schematic view of installing screws into the aluminum alloy left frame bar and the aluminum alloy right frame bar during the first step of installing the aluminum alloy roof luggage rack;
[0024] Figure 9 is an installation schematic view of installing plastic corner pieces on the aluminum alloy front frame bar and the aluminum alloy rear frame bar during the second step of installing the aluminum alloy roof luggage rack;
[0025] Figure 10It is an installation schematic diagram of an aluminum alloy outer frame formed by the mutual installation of an aluminum alloy front frame bar, an aluminum alloy rear frame bar, an aluminum alloy left frame bar, and an aluminum alloy right frame bar during the third installation step of the aluminum alloy roof luggage rack;
[0026] Figure 11 It is an installation schematic diagram of installing screws into each longitudinal rod during the fourth installation step of the aluminum alloy roof luggage rack;
[0027] Figure 12 It is an installation schematic diagram of installing each longitudinal rod with the aluminum alloy outer frame during the fifth installation step of the aluminum alloy roof luggage rack;
[0028] Figure 13 It is an installation schematic diagram of installing each cross bar with the longitudinal rod during the sixth installation step of the aluminum alloy roof luggage rack;
[0029] Figure 14 It is a structural schematic diagram after the installation of the aluminum alloy roof luggage rack is completed;
[0030] Figure 15 It is a structural schematic diagram of the plastic corner piece;
[0031] The markings in the attached drawings are as follows: 1. Aluminum alloy front frame bar; 2. Aluminum alloy rear frame bar; 3. Aluminum alloy left frame bar; 4. Aluminum alloy right frame bar; 5. Aluminum alloy outer frame; 6. Plastic corner piece; 7. Longitudinal rod; 8. Cross bar; 9. First arc surface; 10. Second arc surface; 11. Longitudinal rod installation slot; 12. Rear frame bar installation slot; 13. Frame bar installation slot; 14. Screw installation groove; 15. Screw; 16. Nut; 17. Plug; 18. Socket; 19. Protruding press head. Detailed implementation manners
[0032] Example 1
[0033] A drop-shaped aluminum alloy roof luggage rack described in this Example 1, as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 shown, includes a square-shaped aluminum alloy outer frame 5 formed by the mutual assembly of an aluminum alloy front frame bar 1, an aluminum alloy rear frame bar 2, an aluminum alloy left frame bar 3, and an aluminum alloy right frame bar 4, as well as four plastic corner pieces 6 respectively installed at the four corner positions of the aluminum alloy outer frame, multiple longitudinal rods 7 installed between the aluminum alloy front frame bar and the aluminum alloy rear frame bar and evenly spaced, and multiple cross bars 8 installed between the aluminum alloy left frame bar and the aluminum alloy right frame bar and evenly spaced and connected to all longitudinal rods. The cross-section of the aluminum alloy front frame bar has a drop-shaped structure, and the front end of the aluminum alloy front frame bar is the windward surface. As Figure 6As shown, the front end of the aluminum alloy front frame bar is semi-elliptical, the middle part is flat, and the rear end is a pointed shape formed by gradually narrowing; the front end of the aluminum alloy front frame bar is used as the windward surface and the overall shape is designed in a streamline shape, and the overall shape is similar to a "water droplet" shape, so that the wind resistance coefficient is smaller, and it has a flow guiding design, with lower wind resistance and wind noise; as Figure 7 As shown, the windward surface of the front end of the luggage rack front frame bar of the aluminum alloy roof rack previously applied for by the applicant also has a certain streamline design, but the overall windward surface has a certain included angle similar to a triangle, and the overall height dimension is large and the wall thickness is also large. Using Solidworks software for fluid simulation analysis and testing, simulating the air flow condition at a speed of 120 km / h, under the same conditions, the wind noise generated by the previously applied aluminum alloy roof rack product is about 66 db, and the wind noise of the water droplet-shaped aluminum alloy roof luggage rack is about 55 db. Comparing the two, the wind noise of the water droplet-shaped aluminum alloy roof luggage rack is significantly reduced.
[0034] In this Embodiment 1, the plastic corner piece is inserted and installed on the side of the aluminum alloy front frame bar, and the outer side surface of the plastic corner piece is a semi-elliptical arc surface matching the semi-elliptical shape of the aluminum alloy front frame bar; the outer side surfaces of the aluminum alloy left frame bar and the aluminum alloy right frame bar are both elliptical arc surfaces matching the semi-elliptical arc surface shape of the plastic corner piece. This aluminum alloy roof luggage rack not only designs the shape of the aluminum alloy front frame bar with less wind resistance, but also optimizes the shape of the plastic corner piece, designs the outer side surface of the plastic corner piece into a streamline design more matching the front end of the aluminum alloy front frame bar, and the arc is more narrowed into a semi-elliptical arc surface, which can further reduce wind resistance.
[0035] In this Embodiment 1, the semi-elliptical shape at the front end of the aluminum alloy front frame bar is composed of two upper and lower symmetric first arc surfaces 9, the first arc surface is composed of five arcs, and the radius of each arc of the first arc surface is 43.5 mm, 44.5 mm, 43 mm, 19 mm, 13 mm respectively; the pointed shape at the rear end of the aluminum alloy front frame bar is composed of two upper and lower symmetric second arc surfaces 10, the second arc surface is composed of four arcs, and the radius of each arc of the second arc surface is 37.5 mm, 280.5 mm, 23 mm, 5 mm respectively. The two first arc surfaces of the aluminum alloy front frame bar are symmetrically spliced to form a similar semi-elliptical shape (i.e., the middle bottom shape of the water droplet shape), achieving the purpose of smaller wind resistance on the windward surface; at the same time, the rear end of the aluminum alloy front frame bar is designed into a gradually narrowing pointed shape, so that there is no other turbulent flow effect after the air flow passes through the middle position of the aluminum alloy front frame bar, achieving the effect of smaller air flow contact area, and further reducing the wind resistance. The arc radius parameter design of the above-mentioned arc surfaces and the like are obtained through corresponding tests, meeting the requirements of reasonable design for further reducing wind resistance.
[0036] In the first embodiment, a longitudinal rod mounting groove 11 which is recessed downward is provided on the second arc surface above the rear end of the aluminum alloy front frame bar, and a rear frame bar mounting groove 12 which is recessed downward is provided above the front end of the aluminum alloy rear frame bar; the front end of the longitudinal rod is embedded in the longitudinal rod mounting groove, and the rear end of the longitudinal rod is mounted in the rear frame bar mounting groove, so that the top surface of the longitudinal rod does not protrude from the top surface of the middle position of the aluminum alloy front frame bar; the cross bar is fitted and mounted on the bottom of the longitudinal rod, so that the bottom surface of the cross bar does not protrude from the bottom surface of the middle position of the aluminum alloy front frame bar. The longitudinal rod is mounted in the longitudinal rod mounting groove and the rear frame bar mounting groove, and the cross bar is tightly attached to the bottom plate of the longitudinal rod, so that after the longitudinal rod and the cross bar are mounted, they will not protrude from the top surface and the bottom surface of the aluminum alloy front frame bar at all; that is, when looking horizontally at the aluminum alloy roof luggage rack from the front of the vehicle, only the aluminum alloy front frame bar can be seen, and the longitudinal rod and the cross bar are in a completely hidden state. When the vehicle is running, the air flow will not impact the contact surface of the longitudinal rod and the cross bar, making the air resistance smaller.
[0037] In the first embodiment, the aluminum alloy left frame bar and the aluminum alloy right frame bar are symmetrically arranged inverted L-shaped hollow profile structures, and a frame bar mounting groove 13 which is recessed downward is provided on the second arc surface above the rear end of the aluminum alloy front frame bar; the front ends of the aluminum alloy left frame bar and the aluminum alloy right frame bar are both embedded in the frame bar mounting groove, and the rear ends of the aluminum alloy left frame bar and the aluminum alloy right frame bar are both embedded in the rear frame bar mounting groove; the top surfaces of the aluminum alloy left frame bar and the aluminum alloy right frame bar after installation form a horizontal and flat plane with the top surface of the middle position of the aluminum alloy front frame bar. The two ends of the aluminum alloy left frame bar and the aluminum alloy right frame bar are respectively mounted in the frame bar mounting groove and the rear frame bar mounting groove to realize the installation of the aluminum alloy outer frame. The top surfaces and the bottom surfaces of the aluminum alloy left frame bar and the aluminum alloy right frame bar are connected to the middle position of the aluminum alloy front frame bar to form a seamless plane-like shape, realizing better aesthetics and better flow guiding effect.
[0038] In the first embodiment, screw installation grooves 14 are provided on the top surface of the aluminum alloy outer frame, vertical bars and the bottom surface of the cross bars. Screws 15 are slidably installed in the screw installation grooves. Between the frame bars of the aluminum alloy outer frame, and between the vertical bars and the cross bars, they are fixedly installed through screws and nuts 16 and the screws and nuts are in a non-exposed state. This aluminum alloy roof rack adopts an assembled structure and is assembled through the aluminum alloy outer frame, vertical bars and cross bars. During assembly, screws and nuts are used, etc., and the assembly is convenient. One person can complete the assembly of the entire roof rack, greatly improving the production efficiency of manufacturing this aluminum alloy roof rack in the workshop. This aluminum alloy roof rack can be supplied after being assembled into an integral structure, or each component can be separately packaged and transported for supply. In addition, when the user does not use the aluminum alloy roof rack, the aluminum alloy roof rack can also be disassembled and placed in the vehicle for storage. After disassembly, it occupies less space and has high portability. The assembled aluminum alloy roof rack can be disassembled and stored, occupies less space, and the assembly and disassembly are simple. One person can easily complete the assembly and disassembly of the entire aluminum alloy roof rack.
[0039] In the first embodiment, four vertical bars are provided and three cross bars are provided. The surfaces of the aluminum alloy outer frame, vertical bars and cross bars are covered with Akzo powder coatings by means of electrophoretic coating combined with powder spraying. The previously applied aluminum alloy roof rack adopted the surface treatment process of electrophoretic coating combined with powder spraying, achieving the purpose of enhanced coating adhesion, good physical properties and corrosion resistance. However, in order to further improve adhesion, be more environmentally friendly and non-toxic, and have a longer service life, etc., when the sprayed coating adopts Akzo powder coating, it has the characteristics of being non-toxic, pollution-free and waste-free, and the corrosion resistance is further improved, which can greatly improve the surface performance of the product, and the anti-corrosion, wear-resistant and scratch-resistant properties are effectively improved.
[0040] In Embodiment 1, the total weight of the aluminum alloy outer frame, four plastic corner pieces, four longitudinal bars, and three cross bars is 15 kg. The aluminum alloy outer frame, longitudinal bars, and cross bars are all hollow aluminum alloy profile structures, and the wall thickness formed between the aluminum alloy profile structure and the hollow space is 12 - 15 mm; the height at the middle position of the aluminum alloy front frame bar is 48 - 50 mm; after the longitudinal bars and cross bars are installed in the aluminum alloy outer frame, they do not protrude outward and do not exceed the maximum height of the aluminum alloy front frame bar. The wall thickness of the previously applied aluminum alloy roof rack is about 20 mm, and the height is about 60 mm; under the condition of meeting the load-bearing performance and the same specifications, this aluminum alloy roof luggage rack adopts the above-mentioned wall thickness and height design, etc., and the net weight is 15 kg. The net weight of the previously applied aluminum alloy roof rack is 17.9 kg, which is about 16% lighter than the previously applied aluminum alloy roof rack. In addition, the profile cross-sectional structure, appearance, and wall thickness of this aluminum alloy roof rack have been optimized and verified through static stress analysis. A static stress analysis is carried out on the aluminum alloy roof luggage rack with a 1500 N load applied, and the stress values are far lower than the yield strength of the material, meeting the requirements of reasonable design.
[0041] In Embodiment 1, as Figure 15 shown, both ends of the plastic corner piece are provided with plugs 17, and slots 18 are correspondingly arranged at the four corner positions of the aluminum alloy outer frame for the plugs. The side of the plug is provided with a protruding pressing head 19 that protrudes outward and presses against the inner wall surface of the slot after being inserted into the slot. Since the plastic corner piece only serves as a decoration and is not a load-bearing component, it greatly reduces the potential safety hazards caused by cracking and damage of the plastic corner. The load is evenly distributed on the aluminum alloy frame, and it is installed by a one-step plugging method and is tightly fixed by the protruding pressing head on the plug pressing against the inner wall surface of the slot after installation, achieving the purpose of convenient disassembly and assembly and more reliable installation structure, and the plastic corner piece is not easily detached, and the connection is reliable and firm.
[0042] The installation steps of this drop-shaped aluminum alloy roof luggage rack are as follows: (1) In the first step, first install the screws into the aluminum alloy left frame bar and the aluminum alloy right frame bar, as Figure 8 shown. (2) In the second step, respectively install the four plastic corner pieces into the ends of the aluminum alloy front frame bar and the aluminum alloy rear frame bar, and also install the screws into the aluminum alloy front frame and the aluminum alloy rear frame bar, as Figure 9 shown. (3) In the third step, flip the aluminum alloy left frame bar and the aluminum alloy right frame bar, and assemble the aluminum alloy front frame bar, the aluminum alloy rear frame bar, the aluminum alloy left frame bar, and the aluminum alloy right frame bar correspondingly to form a square shape and fix them with corresponding screws and nuts to form a fixedly installed aluminum alloy outer frame, and the plastic corner pieces are also correspondingly inserted and installed at the four corner positions of the aluminum alloy outer frame, as Figure 10 shown. (4) In the fourth step, install the screws into the four longitudinal bars, as Figure 11As shown in the figure. (5) In the fifth step, turn over the four longitudinal bars and install the longitudinal bars on the aluminum alloy outer frame through screws and nuts to complete the installation of the longitudinal bars, as shown in Figure 12 the figure. (6) In the sixth step, turn over the semi-finished aluminum alloy roof luggage rack in the fifth step, and then install it correspondingly through the nuts and the screws on the longitudinal bars to complete the installation of the cross bars at the bottom of the longitudinal bars, as shown in Figure 13 the figure. After the installation of the cross bars, the installation of the entire aluminum alloy roof luggage rack can be completed, as shown in Figure 14 the figure.
[0043] The water-drop-shaped aluminum alloy roof luggage rack is an aluminum alloy roof luggage rack with lighter weight, higher strength, better corrosion resistance, lower wind noise, etc. The windward side of the aluminum alloy luggage rack further optimizes the shape design and the shape arc of the production line, and is designed into a shape similar to a water-drop shape and a flow guiding design, achieving a smaller wind resistance coefficient and lower wind noise; under the condition of meeting the load-bearing performance and the aluminum alloy roof luggage rack of the same specification, the wall thickness, the cross-sectional structure and the shape of the aluminum alloy profile of the aluminum alloy roof luggage rack are optimized, realizing further weight reduction and achieving a more optimized lightweight purpose; when the surface treatment of the aluminum alloy roof rack adopts the surface treatment process of electrophoresis combined with powder spraying, a paint layer that can further improve the coating adhesion ability, physical properties and corrosion resistance performance is used to further improve the corrosion resistance performance, achieving the purpose of longer service life and maintaining a beautiful appearance for a long time.
[0044] The above is only a preferred embodiment of the present invention, and does not impose any form of limitation on the structure of the present invention. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.
Claims
1. A teardrop-shaped aluminum alloy roof rack, comprising an aluminum alloy outer frame formed by assembling an aluminum alloy front frame bar, an aluminum alloy rear frame bar, an aluminum alloy left frame bar and an aluminum alloy right frame bar to form a square shape, four plastic corner pieces respectively installed at the four corners of the aluminum alloy outer frame, a plurality of longitudinal bars installed between the aluminum alloy front frame bar and the aluminum alloy rear frame bar and evenly spaced, a plurality of transverse bars installed between the aluminum alloy left frame bar and the aluminum alloy right frame bar and evenly spaced and connected to all the longitudinal bars, characterized in that: The cross-section of the aluminum alloy front frame strip is in a water drop shape, and the front end of the aluminum alloy front frame strip is the windward surface; the front end of the aluminum alloy front frame strip is semi-elliptical, the middle position is flat, and the rear end is gradually narrowed to form a pointed tip; the plastic angle piece is inserted into the side of the aluminum alloy front frame strip for installation, and the outer side surface of the plastic angle piece is a semi-elliptical arc surface that matches the semi-elliptical shape of the aluminum alloy front frame strip; the outer side surfaces of the aluminum alloy left frame strip and the aluminum alloy right frame strip are both elliptical arc surfaces that match the semi-elliptical arc surface shape of the plastic angle piece.
2. The teardrop-shaped aluminum alloy roof rack according to claim 1, characterized in that: The aluminum alloy outer frame, longitudinal bars and transverse bars are all hollow aluminum alloy profile structures, and the wall thickness formed between the aluminum alloy profile structure and the hollow space is 12-15mm; the middle position height of the aluminum alloy front frame bar is 48-50mm; after the longitudinal bars and transverse bars are installed in the aluminum alloy outer frame, they do not bulge outward and are not higher than the maximum height of the aluminum alloy front frame bar.
3. The teardrop-shaped aluminum alloy roof rack according to claim 2, characterized in that: The semi-elliptical shape of the front end of the aluminum alloy front frame strip is composed of two first arc surfaces that are symmetrical up and down, the first arc surface is composed of five arc segments, and the radius of each arc segment of the first arc surface is 43.5mm, 44.5mm, 43mm, 19mm, and 13mm respectively; the pointed shape of the rear end of the aluminum alloy front frame strip is composed of two second arc surfaces that are symmetrical up and down, the second arc surface is composed of four arc segments, and the radius of each arc segment of the second arc surface is 37.5mm, 280.5mm, 23mm, and 5mm respectively.
4. The teardrop-shaped aluminum alloy roof rack according to claim 3, characterized in that: A downwardly recessed longitudinal bar mounting groove is provided on the second arc surface above the rear end of the aluminum alloy front frame strip, and a downwardly recessed rear frame strip mounting groove is provided above the front end of the aluminum alloy rear frame strip; the front end of the longitudinal bar is embedded and installed in the longitudinal bar mounting groove, and the rear end of the longitudinal bar is installed in the rear frame strip mounting groove to form a top surface of the longitudinal bar that does not protrude from the top surface of the middle position of the aluminum alloy front frame strip; the cross bar is fitted and installed at the bottom of the longitudinal bar to form a bottom surface of the cross bar that does not protrude from the bottom surface of the middle position of the aluminum alloy front frame strip.
5. The teardrop-shaped aluminum alloy roof rack according to claim 4, characterized in that: The aluminum alloy left frame bar and the aluminum alloy right frame bar are symmetrically arranged inverted L-shaped hollow profile structures, and a downwardly recessed frame bar installation groove is provided on the second arc surface above the rear end of the aluminum alloy front frame bar; the front ends of the aluminum alloy left frame bar and the aluminum alloy right frame bar are embedded and installed in the frame bar installation groove, and the rear ends of the aluminum alloy left frame bar and the aluminum alloy right frame bar are embedded and installed in the rear frame bar installation groove; the top surfaces of the aluminum alloy left frame bar and the aluminum alloy right frame bar after installation form a horizontal and flat plane with the top surface of the middle position of the aluminum alloy front frame bar.
6. The teardrop-shaped aluminum alloy roof rack according to claim 5, characterized in that: The top surfaces of the aluminum alloy outer frame and the longitudinal bars and the bottom surfaces of the cross bars are all provided with screw installation grooves, and screws that slide into the screw installation grooves are provided. The frame bars of the aluminum alloy outer frame, the longitudinal bars and the cross bars are all fixedly installed by screws and nuts, and the screws and nuts are in a non-exposed state.
7. The teardrop-shaped aluminum alloy roof rack according to claim 6, characterized in that: There are four longitudinal bars and three transverse bars; the surfaces of the aluminum alloy outer frame, longitudinal bars and transverse bars are covered with Akzo powder coating by using a surface treatment method combining electrophoresis and powder spraying.
8. The teardrop-shaped aluminum alloy roof rack according to claim 7, characterized in that: The overall weight of the aluminum alloy outer frame, the four plastic corner pieces, the four longitudinal bars and the three transverse bars is 15 kg.
9. The teardrop-shaped aluminum alloy roof rack according to claim 8, characterized in that: Plugs are arranged at both ends of the plastic angle piece, slots are arranged at the four corners of the aluminum alloy outer frame corresponding to the plugs, and a protruding pressure head is arranged on the side of the plug to protrude outwards and press the inner wall of the slot after being inserted into the slot.