A main frame structure for a flying car and an integrated air-to-ground aircraft

Abstract

This utility model relates to the technical field of low-altitude aircraft frame structure, specifically to a main frame structure for a flying car and an integrated air-to-ground aircraft. It includes a main frame with two short sides extending outwards to form a first connecting arm and a second connecting arm, the first connecting arm being shorter than the second connecting arm; multiple folding sections fixedly installed at both ends of the first and second connecting arms; and a drive unit installed on the outer sides of the two long sides of the main frame, capable of rotating the folding sections. The main frame of this utility model adopts an unequal-distance design, allowing for the folding of external rotors without lengthening the main frame, thus enabling the extension and retraction of the rotors of the integrated air-to-ground flying car. This allows the flying car to switch between land-based and flight modes, improving the convenience of use.

Description

Technical Field

[0001] This utility model relates to the technical field of low-altitude aircraft frame structure, specifically to a main frame structure for a flying car and an air-to-ground integrated aircraft. Background Technology

[0002] With the development of urban air mobility, low-altitude aircraft such as drones, eVTOL, and flying cars have become cutting-edge research and development directions. In flying cars, the main frame is the core load-bearing component, which needs to connect the land-based body and the flying body to coordinate flight and land travel.

[0003] However, the existing main frameworks designed and manufactured to meet the needs of automobiles and vertical takeoff and landing aircraft (eVTOL) mostly consider a single land or flight mode. This single-mode design is difficult to adapt to the needs of integrated land and air flying cars for rotor extension and retraction and land-air mode switching, which will hinder the smooth driving of flying cars and reduce their convenience. Summary of the Invention

[0004] In view of the above-mentioned shortcomings in the existing technology, this utility model provides a main frame structure for a flying car and an air-to-ground integrated aircraft. This solves the problem that the design and manufacturing of the main frame to meet the use of automobiles and vertical take-off and landing aircraft (eVTOL) mostly consider a single land or flight mode. This single-mode design is difficult to adapt to the needs of the air-to-ground integrated flying car for rotor extension and retraction and air-to-ground mode switching, which will hinder the smooth driving of the flying car and reduce the convenience of the flying car.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A main frame structure for a flying car and an air-to-ground integrated aircraft includes a main frame, with two short sides of the main frame extending outward to form a first connecting arm and a second connecting arm, the length of the first connecting arm being less than the length of the second connecting arm; multiple folding parts, the multiple folding parts being fixedly installed at both ends of the first connecting arm and the second connecting arm; and a drive unit, the drive unit being installed on the outside of the two long sides of the main frame, the drive unit being capable of driving the folding parts to rotate.

[0006] In this way, when the flying car needs to enter the land travel mode, the driving part is activated to drive the folding part to rotate towards the main frame. The length of the first connecting arm is less than that of the second connecting arm. Therefore, during the folding process, the driving part first drives the folding part connected to the first connecting arm to rotate towards the main frame. After the folding part connected to the first connecting arm rotates in place, the driving part then drives the folding part connected to the second connecting arm to rotate towards the main frame. At this time, the folding parts connected by the first connecting arm and the second connecting arm are overlapped and placed in parallel, and the rotors externally connected to the folding parts are also overlapped and placed in parallel. Similarly, when the flying car enters the flight mode, the driving part is activated to drive the folding part to rotate in a direction away from the main frame. The driving part first drives the folding part connected to the second connecting arm to rotate away from the main frame. After the folding part connected to the second connecting arm rotates in place, the driving part then drives the folding part connected to the first connecting arm to rotate towards the main frame. At this time, the folding parts connected by the first connecting arm and the second connecting arm are fully unfolded, and the rotors externally connected to the folding parts are also fully unfolded. With this structure, the main frame adopts a non-equidistant design, and it is possible to fold the externally connected rotors without lengthening the length of the main frame, cooperate to complete the retraction and extension of the rotors of the land-air integrated flying car, and thus the flying car can switch between the land travel or flight mode, improving the convenience of using the flying car.

[0007] Furthermore, the overall shape of the main frame is like a Chinese character 'Mu'.

[0008] In this way, the main frame is formed by the interweaving of horizontal and vertical members to form multiple closed loops. When cyclic loads act on a local area, the force can be dispersed and transmitted through multiple closed-loop paths, converting the concentrated load into a distributed load, avoiding overloading of a single force transmission channel. With this structure, it is possible to reduce the possibility of local stress superposition caused by unbalanced forces on the main frame.

[0009] Furthermore, the main frame is made of carbon fiber braided material, which can effectively reduce the weight of the main frame without affecting its strength, facilitating the lightweight of the main frame.

[0010] Furthermore, the folding part includes arm fixing parts fixedly installed at the ends of the first connecting arm and the second connecting arm, and folding parts are rotatably connected to the end faces of the arm fixing parts.

[0011] In this way, when it is necessary to cooperate with the arm to fold and complete the retraction and extension of the rotor, the driving part drives the folding part to rotate around the arm fixing part, driving the arm externally connected to the folding part to rotate towards the main frame. With this structure, it is possible to cooperate with the arm to fold and complete the retraction and extension of the rotor.

[0012] Furthermore, the drive unit includes multiple electric cylinder lugs symmetrically and fixedly installed on the outer side of the long side of the main frame. Each electric cylinder lug is rotatably connected to an electric push rod. Each electric push rod corresponds to a folding component and its end is rotatably connected to the folding component, thereby driving the folding component to rotate and cooperate with the arm to fold and complete the extension and retraction of the rotor.

[0013] Furthermore, the two long sides of the main frame are symmetrically fixedly equipped with connecting parts. The connecting parts include upper connectors symmetrically fixedly installed on the long sides of the main frame. The bottom surface of the upper connector is fixedly connected to a hanger rod, the bottom surface of the hanger rod is fixedly installed with a lower connector, and the bottom surface of the lower connector is fixedly connected to a roll cage beam, thereby facilitating the connection between the main frame and the roll cage beam of the flying car.

[0014] Furthermore, a reinforcing rod is fixedly connected between the upper connector and the opposite lower connector, thereby strengthening the connection between the roll cage beams and improving the stability of the roll cage beams.

[0015] Furthermore, the surface of the main frame is a smooth, continuous curved surface, which can guide the airflow and reduce the air resistance experienced by the main frame.

[0016] Furthermore, the main frame surface has pre-drilled holes for wire installation, which facilitates the route planning of land-based and air-based vehicles. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the main frame in an embodiment of the main frame structure of a flying car and an air-to-ground integrated aircraft of this utility model; Figure 2 This is a three-dimensional structural diagram of an embodiment of the main frame structure of a flying car and an integrated air-ground aircraft according to the present invention. Figure 3 for Figure 2 A magnified schematic diagram of the partial structure at point A in the middle; Figure 4 This is a three-dimensional structural diagram (another view) of an embodiment of the main frame structure of a flying car and an air-to-ground integrated aircraft according to the present invention. Reference numerals in the accompanying drawings: Main frame 1, first connecting arm 101, second connecting arm 102; Folding part 2, arm fixing part 201, folding part 202; Drive unit 3, electric cylinder lug 301, electric push rod 302; Connecting part 4, upper connector 401, hanger rod 402, lower connector 403, anti-roll frame crossbeam 404, reinforcing rod 405; Wire mounting hole 5. Detailed implementation mode

[0018] In order to enable those skilled in the art to better understand the present utility model, the technical solution of the present utility model will be further described below in conjunction with the drawings and embodiments.

[0019] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation of this patent; in order to better illustrate the embodiments of the present utility model, some components in the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0020] Embodiment: As Figures 1-4 shown, a flight vehicle and an air-ground integrated machine flight body main frame structure of the present utility model includes a main frame 1. The main frame 1 is overall in the shape of a square with a hole in the middle, and the surface of the main frame 1 is a smooth continuous curved surface. A wire installation hole 5 is reserved on the surface of the main frame 1. Both short sides of the main frame 1 extend outward to form a first connecting arm 101 and a second connecting arm 102 respectively. The length of the first connecting arm 101 is less than the length of the second connecting arm 102.

[0021] Folding parts 2 are fixedly installed at both ends of the first connecting arm 101 and the second connecting arm 102. Specifically, the folding part 2 includes arm fixing parts 201 fixedly installed at the ends of the first connecting arm 101 and the second connecting arm 102. Folding parts 202 are rotatably connected to the end faces of the arm fixing parts 201. The folding parts 202 are externally connected to the arms with installed rotors.

[0022] Driving parts 3 are installed on the outer sides of the two long sides of the main frame 1. Specifically, the driving parts 3 include a plurality of electric push rod lugs 301 symmetrically and fixedly installed on the outer sides of the long sides of the main frame 1. Electric push rods 302 are rotatably connected to the outer sides of the electric push rod lugs 301. The electric push rods 302 correspond to the folding parts 202 one by one and the ends are rotatably connected to the folding parts 202.

[0023] Connecting parts 4 are symmetrically and fixedly installed on the two long sides of the main frame 1. Specifically, the connecting parts 4 include upper joints 401 symmetrically and fixedly installed on the long sides of the main frame 1. A suspension rod 402 is fixedly connected to the bottom surface of the upper joint 401. A lower joint 403 is fixedly installed on the bottom surface of the suspension rod 402. An anti-roll bar cross beam 404 is fixedly connected to the bottom surface of the lower joint 403. Reinforcement rods 405 are fixedly connected between the upper joint 401 and the opposite lower joint 403.

[0024] For a flight vehicle and an air-ground integrated machine flight body main frame structure of the present utility model, finite element analysis load calculation is carried out using the specification dimensions of the main frame 1, and the results are shown in the following table:

[0025] Table 1: Load Calculation Data for Finite Element Analysis Analysis of the data in the table above shows that: 1. The main frame 1 of this utility model can withstand a yield strength of up to 3500 MPa; 2. The main frame 1 of this utility model needs to withstand stresses ranging from 200.3 MPa to 252.8 MPa during use; 3. By comparing the tensile yield strength and the local maximum fatigue stress, it can be seen that the tensile yield strength that the main frame 1 can achieve is much greater than the local maximum fatigue that occurs in actual use. The main frame 1 of this utility model can meet the usage requirements after reducing the weight.

[0026] The main frame structure of the flying car and air-to-ground integrated aircraft of this utility model is made of carbon fiber woven material, specifically carbon fiber T300 material with a density of 1.76 g / cm^3, while common car frames are mostly made of steel with a density of 7.85 g / cm^3.

[0027] Analysis of Table 1 shows that, while meeting the strength requirements of the main frame, the weight of the main frame has been effectively reduced, which is conducive to achieving the lightweighting of the main frame.

[0028] The above are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent.

Claims

1. A main frame structure for a flying car and an integrated air-to-ground aircraft, characterized in that, Comprising: A main body frame (1), both short sides of the main body frame (1) extend outward to form a first connecting arm (101) and a second connecting arm (102) respectively, and the length of the first connecting arm (101) is less than the length of the second connecting arm (102); A plurality of folding parts (2), and the plurality of folding parts (2) are respectively fixedly installed at both ends of the first connecting arm (101) and the second connecting arm (102); A driving part (3), the driving part (3) is installed on the outer sides of the two long sides of the main body frame (1), and the driving part (3) can drive the folding part (2) to rotate.

2. The main frame structure of a flying car and an integrated air-to-ground aircraft as described in claim 1, characterized in that: The main body frame (1) is in an overall shape of a Chinese character 'Mu'.

3. The main frame structure of a flying car and an integrated air-to-ground aircraft as described in claim 2, characterized in that: The main body frame (1) is made of carbon fiber woven material.

4. The main frame structure of a flying car and an integrated air-to-ground aircraft as described in claim 1, characterized in that: The folding part (2) includes an arm fixing part (201) fixedly installed at the ends of the first connecting arm (101) and the second connecting arm (102), and a folding part (202) is rotatably connected to the end face of the arm fixing part (201).

5. The main frame structure of a flying car and an integrated air-to-ground aircraft as described in claim 4, characterized in that: The driving part (3) includes a plurality of electric push rod connecting ears (301) symmetrically and fixedly installed on the outer sides of the long sides of the main body frame (1), an electric push rod (302) is rotatably connected to the outside of each electric push rod connecting ear (301), the electric push rods (302) correspond to the folding parts (202) one by one and the ends thereof are rotatably connected to the folding parts (202).

6. The main frame structure of a flying car and an integrated air-to-ground aircraft as described in claim 1, characterized in that: Two long sides of the main body frame (1) are symmetrically and fixedly installed with connecting parts (4), and the connecting part (4) includes an upper joint (401) symmetrically and fixedly installed on the long side of the main body frame (1), a suspension rod (402) is fixedly connected to the bottom surface of the upper joint (401), a lower joint (403) is fixedly installed on the bottom surface of the suspension rod (402), and an anti-roll bar cross beam (404) is fixedly connected to the bottom surface of the lower joint (403).

7. The main frame structure of a flying car and an integrated air-to-ground aircraft as described in claim 6, characterized in that: A reinforcing rod (405) is fixedly connected between the upper joint (401) and the opposite lower joint (403).

8. The main frame structure of a flying car and an integrated air-to-ground aircraft as described in claim 1, characterized in that: The surface of the main body frame (1) is a smooth continuous curved surface.

9. The main frame structure of a flying car and an integrated air-to-ground aircraft as described in claim 1, characterized in that: A wire installation hole (5) is reserved and opened on the surface of the main body frame (1).

Images