An integrated EVTOL rotor arm

Abstract

This utility model relates to the field of EVTOL technology, and in particular discloses an integral EVTOL rotor arm, including a frame, an upper skin and a lower skin located on the upper and lower sides of the frame respectively; the upper and lower skins are fitted together to form a accommodating chamber for accommodating the frame. The frame includes a beam plate and two sets of loading structures respectively disposed at both ends of the beam plate. The loading structures are used to install the drive motor of the external EVTOL. This integral EVTOL rotor arm forms an accommodating chamber to accommodate the frame through the upper and lower skins fitting together. The frame uses the beam plate as the core load-bearing component and has loading structures at both ends to install the drive motor. The symmetrically arranged loading structures at both ends can optimize the load distribution, reduce the additional bending moment on the EVTOL wing, and reduce the wing load requirements. Furthermore, the fitting structure of the upper and lower skins simplifies the overall assembly process of the arm, improves assembly efficiency and structural integrity, and provides a guarantee for the structural stability and safety of the EVTOL during flight.

Description

Technical Field

[0001] This utility model relates to the field of EVTOL technology, and in particular discloses an integral EVTOL rotor arm. Background Technology

[0002] In the field of electric vertical takeoff and landing (EVTOL) aircraft, the rotor support structure must meet the requirements of high tensile force and high torque bearing under high-speed and high-frequency speed regulation scenarios of the motor, while also possessing high fatigue resistance and rigidity. The design of the support structure has become a key challenge in the industry. In existing technologies, some EVTOL motor arms adopt a pure integral frame structure, but their frames are mostly composed of frames and relatively weak stringers, which have insufficient bending resistance and are prone to structural failure under the high tensile force of the motor. Other technologies use a multi-segment lift support beam structure, connecting the segmented beams through hinge joints. This results in the front and rear motor loads needing to be transferred to the wing separately, generating large bending moments at the connection roots, increasing structural weight, and making the structure complex, difficult to disassemble and assemble, and unfavorable for regular maintenance. Utility Model Content

[0003] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide an integral EVTOL rotor arm.

[0004] To achieve the above objectives, this utility model provides an integral EVTOL rotor boom, characterized in that it includes a frame, an upper skin and a lower skin located on the upper and lower sides of the frame respectively; the upper skin and the lower skin are fitted together to form a receiving chamber for accommodating the frame, the frame includes a beam plate and two sets of loading structures respectively disposed at both ends of the beam plate, the loading structures being used to install the drive motor of the external EVTOL.

[0005] The integrated EVTOL rotor arm is formed by the combination of an upper and lower skin to create a cavity that houses the frame. The frame uses a beam plate as the core load-bearing component, with loading structures at both ends to mount the drive motors. In practice, the beam plate serves as the core support, and loading structures are assembled at both ends of the beam plate to fix the EVTOL drive motors. Then, the upper and lower skins are fitted onto the sides of the frame, forming a cavity that houses the frame and ensuring stable assembly of all components. The advantages are that the integrated cavity and frame structure allows for stable transmission of motor loads along the beam plate, avoiding excessive stress on the local parts of the arm caused by distributed loads. At the same time, the symmetrically arranged loading structures at both ends optimize load distribution, reduce additional bending moments on the EVTOL wing, and lower the wing load requirements. Furthermore, the combination of the upper and lower skins simplifies the overall assembly process of the arm, improves assembly efficiency and structural integrity, and provides a guarantee for the structural stability and safety of the EVTOL during flight.

[0006] The loading structure includes two sets of support frames respectively set at both ends of the beam plate, two sets of motor mounts respectively set on the two sets of support frames, and the external evtol drive motor is mounted on the motor mount.

[0007] Using the beam as the core load-bearing foundation, two sets of support frames are first assembled at both ends of the beam. Then, two sets of motor mounts are fixed to the two sets of support frames respectively. Finally, the external EVTOL drive motor is installed on the motor mount, so that the drive motor forms a stable force transmission path with the beam through the motor mount, support frame, and beam. The beneficial effects are that the modular design of "support frame + motor mount" can not only provide a stable mounting carrier for the drive motor and ensure the structural stability of the motor during operation, but also buffer the direct impact of the motor load on the beam through the support frame, optimizing the load transmission efficiency. At the same time, the symmetrically distributed loading structure at both ends can make the arm bear the force evenly, avoiding structural damage caused by concentrated load on one side. Moreover, the modular assembly method facilitates the disassembly and maintenance of the drive motor, which meets the requirements of EVTOL rotor arm for structural safety, load rationality, and maintenance convenience.

[0008] The beam plate is provided in two sets, and the beam plate has a C-shaped structure. The beam plate includes a main beam web and two sets of main beam edge strips respectively set at both ends of the main beam web. The two sets of main beam edge strips are located on the same side of the main beam web, and the main beam edge strips and the main beam web are integrally formed.

[0009] First, two sets of integrally formed C-shaped beams are prepared (each set consists of a main beam web and two side main beam flanges, with structural integrity ensured through an integral molding process). The two sets of C-shaped beams are connected to the connecting frame to form a double-beam core load-bearing structure. The beneficial effect is that the integrally formed C-shaped beams (including the main beam web and flanges) can avoid stress weak points in the spliced ​​structure, significantly improve the bending and torsional stiffness of a single set of beams, and meet the high load transmission requirements of the EVTOL motor. The double-beam structure formed by the two sets of beams can further enhance the overall load-bearing capacity of the support arm. At the same time, the C-shaped cross-section design can optimize the amount of material used while ensuring structural strength, reduce the self-weight of the support arm, meet the dual requirements of EVTOL for lightweight structure and high stability, and provide reliable support for the balanced transmission of motor load.

[0010] The frame also includes a front wing connecting frame and a rear wing connecting frame set on the beam plate. The front wing connecting frame and the rear wing connecting frame are both bonded to the side wall of the beam plate with structural adhesive. The wing connecting frame is provided with a first mounting hole, and the beam plate is provided with a second mounting hole connected to the first mounting hole. External bolts pass through the first mounting hole and the second mounting hole in sequence to install the connecting frame on the beam plate.

[0011] Using the frame beams as the installation base, structural adhesive is first applied to the corresponding positions on the sidewalls of the beams. The front wing connecting frames and the rear wing connecting frames are then bonded to the sidewalls of the beams. External bolts are then inserted through the pre-set first mounting holes on the front and rear wing connecting frames and the matching second mounting holes on the beams to complete the fixation, forming a "bonded + bolted" combined connection structure between the connecting frames and the beams. The structural adhesive bonding ensures a tight fit between the connecting frames and the beams, dispersing local contact stress, while the bolt connection further strengthens the connection strength. This dual connection method avoids the risk of failure of a single connection, ensuring that the front and rear wing connecting frames stably transmit the motor load to the beams. At the same time, the standardized mounting hole design simplifies the assembly positioning process and improves assembly efficiency, meeting the design requirements of this integral EVTOL rotor boom for structural connection safety, load transmission stability, and assembly convenience, effectively supporting the reliable connection between the boom and the wing.

[0012] A backing plate is provided on the side of the beam plate near the external bolt. The backing plate is bonded to the connection between the second mounting hole of the beam plate and the external bolt via structural adhesive. The backing plate is used to reduce the connection stress of the external bolt on the beam plate.

[0013] The pad is stably attached to the contact area between the bolt and the beam plate using structural adhesive. It can effectively disperse the local compressive stress around the second mounting hole of the beam plate when the external bolts are tightened, and prevent the hole from cracking or deforming due to stress concentration. This ensures the structural integrity of the beam plate as the core load-bearing component. At the same time, the structural adhesive ensures that the pad is tightly attached to the beam plate without relative displacement, further improving the stress dispersion effect. This meets the reliability requirements of the hole structure of the EVTOL rotor arm during long-term load transfer, and provides additional protection for the stable connection between the arm and the wing.

[0014] The lower skin is provided with a recessed platform, and the upper skin is bonded and fixed to the lower skin via the recessed platform of the lower skin.

[0015] The countersunk platform can quickly locate the bonding position between the upper and lower skins, avoiding assembly misalignment. At the same time, the boss structure can increase the bonding contact area between the skins to a certain extent, improving the connection stability of the upper and lower skins.

[0016] The beam plate is provided with multiple sets of partition frames at equal intervals. There are four sets of partition frames. Two sets of partition frames are located on the side of the front wing connecting frame away from the rear wing connecting frame, and two sets of partition frames are located on the side of the rear wing connecting frame away from the front wing connecting frame. The partition frames are connected to the beam plate by adhesive bonding. The partition frames are used to maintain the shape of the rotor arm and improve the structural stability of the beam plate.

[0017] The four sets of partition frames, which are evenly distributed and placed on the outside of the front and rear wing connecting frames, can form a stable structure with the beam plate through adhesive bonding. This effectively maintains the overall shape accuracy of the rotor arm after the upper and lower skins are wrapped, preventing the skin from deforming due to stress or vibration. They also provide auxiliary support to the beam plate, enhancing its bending resistance and structural stability during load transfer. This improves the structural reliability of the integral EVTOL rotor arm and makes it suitable for the stress requirements of EVTOL during flight.

[0018] The inner side of the beam plate is provided with multiple sets of brackets, which are used to install evtol parts.

[0019] By installing multiple sets of brackets on the inner side of the beam, a dedicated and stable mounting platform can be provided for EVTOL parts, avoiding structural interference caused by direct contact between the parts and the beam or skin. EVTOL parts can be used as mounting components for motor control harnesses, and sensors (such as stress sensors and temperature sensors) for monitoring arm stress or motor operating status. These parts need to be installed close to the motor or the core load-bearing part of the arm to achieve signal acquisition and wiring neatness.

[0020] The motor mount is connected to the support frame via detachable bolts.

[0021] The detachable bolt connection method ensures a stable connection between the motor mount and the support frame, guaranteeing the structural reliability of the drive motor under load transmission and flight vibration environments after installation. On the other hand, it allows for quick separation of the two by removing the bolts when it is necessary to change the motor model or inspect the motor mount or support frame, without disassembling other core components of the support arm, significantly improving maintenance convenience.

[0022] The front wing connecting frame and the rear wing connecting frame have the same structural dimensions, and the two are symmetrically arranged along the length of the beam plate, so that the load transfer path at both ends of the support arm remains symmetrical and balanced.

[0023] The front and rear wing connecting frames are connected by a combination of adhesive bonding and bolts, and fixed symmetrically on both sides of the beam plate along its length. This ensures that their installation positions and connection methods on the beam plate are completely symmetrical. The beneficial effect is that the front and rear wing connecting frames, with consistent structural dimensions and symmetrical arrangement, allow the loads transmitted from the motors at both ends of the outrigger to the beam plate through the loading structure to be evenly transmitted to the wing along the symmetrical connecting frame path. This avoids load transfer offset caused by asymmetry in the connecting frame structure or position, effectively balances the forces at both ends of the outrigger, reduces the additional bending moment on the wing, and lowers the load-bearing pressure on the wing. At the same time, the symmetrical structure simplifies the processing and assembly positioning of the connecting frames, meeting the design requirements of this integral EVTOL rotor outrigger for load transfer stability and ease of structural assembly.

[0024] The beneficial effects of this utility model are as follows: Through the structural design of "upper skin + lower skin + integral frame", with an integrally molded C-shaped double beam plate as the core load-bearing foundation, combined with a modular loading structure, a symmetrical front and rear wing connection frame connected by "adhesive + bolt", stress dispersion pads, a bulkhead frame that balances shape and stability, and equipment mounting brackets, a complete force transmission and functional system is formed; the integrally molded C-shaped beam plate and double beam structure improve bending and torsional stiffness, while taking into account lightweight and high load-bearing capacity; the symmetrical connection frame and loading structure balance the forces at both ends, reducing the additional bending moment of the wing; the "adhesive + bolt" and pad design avoids connection failure and stress concentration, ensuring structural reliability; the bulkhead frame maintains the shape accuracy of the outrigger and enhances the stability of the beam plate; the bracket provides dedicated installation space for electrical and monitoring components, avoiding structural interference; the detachable bolt connection between the motor mount and the support frame significantly improves maintenance convenience, and the overall design meets evtol's multiple core requirements for rotor outrigger structural stability, load rationality, assembly efficiency, and maintenance convenience. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the skeleton of this utility model;

[0027] Figure 3 This is a cross-sectional view of the connection between the connecting frame and the beam plate of this utility model;

[0028] Figure 4 This is a sectional view of the beam-slab of this utility model;

[0029] Figure 5 This is a schematic diagram of the lower skin structure of this utility model.

[0030] The reference numerals in the figures include:

[0031] 1. Upper skin; 2. Lower skin; 21. Sloping platform; 3. Frame; 31. Beam plate; 311. Main beam web plate; 312. Main beam flange; 32. Motor mount; 33. Support frame; 34. Spacer frame; 35. Bracket; 36. Front wing connection frame; 37. Rear wing connection frame; 38. Pad plate; 39. Structural adhesive. Detailed Implementation

[0032] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0033] Please see Figures 1 to 5As shown, this utility model discloses an integral EVTOL rotor arm, characterized in that it includes a frame 3, an upper skin 1 and a lower skin 2 located on both sides of the frame 3 respectively; the upper skin 1 and the lower skin 2 are fitted together to form a accommodating chamber for accommodating the frame 3, the frame 3 includes a beam plate 31 and two sets of loading structures respectively disposed at both ends of the beam plate 31, the loading structures being used to install the drive motor of the external EVTOL.

[0034] The integral EVTOL rotor arm is formed by the upper skin 1 and the lower skin 2 covering each other to form a cavity that houses the frame 3. The frame 3 uses the beam plate 31 as the core load-bearing component and has loading structures at both ends to install the drive motor. In specific implementation, the beam plate 31 is used as the core support, and loading structures are assembled at both ends of the beam plate 31 to fix the EVTOL drive motor. Then, the upper skin 1 and the lower skin 2 are correspondingly covered on both sides of the frame 3, so that the two enclose the cavity that houses the frame 3, ensuring the stable assembly of each component. Its beneficial effects are that the integral cavity and frame 3 structure can realize the stable transmission of motor load along the beam plate 31, avoiding excessive stress on the local part of the arm caused by the distributed load. At the same time, the symmetrical loading structures at both ends can optimize the load distribution, reduce the additional bending moment on the EVTOL wing, reduce the wing load requirements, and the covering structure of the upper skin 1 and the lower skin 2 simplifies the overall assembly process of the arm, improves the assembly efficiency and structural integrity, and provides a guarantee for the structural stability and safety of the EVTOL during flight.

[0035] The loading structure includes two sets of support frames 33 respectively set at both ends of the beam plate 31, and two sets of motor seats 32 respectively set on the two sets of support frames 33. The external evtol drive motor is installed on the motor seat 32.

[0036] Using the beam plate 31 as the core load-bearing foundation, two sets of support frames 33 are first assembled at both ends of the beam plate 31, and then two sets of motor mounts 32 are fixed on the two sets of support frames 33 respectively. Finally, the external EVTOL drive motor is installed on the motor mount 32, so that the drive motor forms a stable force transmission path with the beam plate 31 through the motor mount 32, support frame 33, and beam plate 31. Its beneficial effects are that, through the modular design of "support frame 33 + motor mount 32", it can provide a stable mounting carrier for the drive motor, ensuring the structural stability of the motor during operation, and can also buffer the direct impact of the motor load on the beam plate 31 through the support frame 33, optimizing the load transmission efficiency. At the same time, the symmetrically distributed loading structure at both ends can make the arm bear the force evenly, avoiding structural damage caused by concentrated load on one side. Moreover, the modular assembly method facilitates the disassembly and maintenance of the drive motor, which meets the requirements of EVTOL rotor arm for structural safety, load rationality, and maintenance convenience.

[0037] The beam plate 31 is provided in two sets. The beam plate 31 has a C-shaped structure. The beam plate 31 includes a main beam web 311 and two sets of main beam flanges 312 respectively disposed at both ends of the main beam web 311. The two sets of main beam flanges 312 are located on the same side of the main beam web 311. The main beam flanges 312 and the main beam web 311 are integrally formed.

[0038] First, two sets of integrally formed C-shaped beam plates 31 are prepared (each set of beam plates 31 consists of a main beam web 311 and main beam flanges 312 on both sides, and the structural integrity is ensured by integral molding process). The two sets of C-shaped beam plates are connected to the connecting frame 36 to form a double beam core load-bearing structure. Its beneficial effect is that the integrally formed C-shaped beam plates 31 (including the main beam web 311 and flanges) can avoid the stress weak points of the spliced ​​structure, significantly improve the bending and torsional stiffness of a single set of beam plates 31, meet the high load transmission requirements of EVTOL motor, and the double beam structure formed by the two sets of beam plates 31 can further enhance the overall load-bearing capacity of the support arm. At the same time, the C-shaped cross-section design can optimize the amount of material used and reduce the self-weight of the support arm while ensuring the structural strength, which meets EVTOL's dual requirements for lightweight structure and high stability, and provides reliable support for the balanced transmission of motor load.

[0039] The frame 3 also includes a front wing connecting frame 36 and a rear wing connecting frame 37 disposed on the beam plate 31. The front wing connecting frame 36 and the rear wing connecting frame 37 are both bonded to the side wall of the beam plate 31 by structural adhesive 39. The wing connecting frame is provided with a first mounting hole, and the beam plate 31 is provided with a second mounting hole connected to the first mounting hole. External bolts pass through the first mounting hole and the second mounting hole in sequence to install the connecting frame on the beam plate 31.

[0040] Using the beam plate 31 of the frame 3 as the installation base, structural adhesive 39 is first applied to the corresponding positions on the side wall of the beam plate 31. The front wing connecting frame 36 and the rear wing connecting frame 37 are then attached and bonded to the side wall of the beam plate 31. External bolts are then inserted through the pre-set first mounting holes on the front wing connecting frame 36 and the rear wing connecting frame 37 and the matching second mounting holes on the beam plate 31 to complete the fixation, so that the connecting frame and the beam plate 31 form a "bonding + bolt" combined connection structure. The structural adhesive 39 bonding can achieve a tight fit between the connecting frame and the beam plate 31 and disperse local contact stress, while the bolt connection can further strengthen the connection strength. The dual connection method avoids the risk of failure of a single connection and ensures that the front and rear wing connecting frames 37 stably transmit the motor load to the beam plate 31. At the same time, the standardized mounting hole design simplifies the assembly positioning process and improves assembly efficiency, which meets the design requirements of the integral EVTOL rotor arm for structural connection safety, load transmission stability and assembly convenience, and effectively supports the reliable connection between the arm and the wing.

[0041] A pad 38 is provided on the side of the beam plate 31 near the external bolt. The pad 38 is bonded to the connection between the second mounting hole of the beam plate 31 and the external bolt via structural adhesive 39. The pad 38 is used to reduce the connection stress of the external bolt on the beam plate 31.

[0042] The pad 38 is stably attached to the contact area between the bolt and the beam plate 31 by the structural adhesive 39. It can effectively disperse the local compressive stress around the second mounting hole of the beam plate 31 when the external bolt is tightened, and avoid cracking or deformation of the hole due to stress concentration. This ensures the structural integrity of the beam plate 31 as the core load-bearing component. At the same time, the adhesive 39 ensures that the pad 38 and the beam plate 31 are tightly attached without relative displacement, further improving the stress dispersion effect. This meets the requirements of the EVTOL rotor arm for the reliability of the hole structure during long-term load transfer, and provides additional protection for the stable connection between the arm and the wing.

[0043] The lower skin 2 is provided with a recessed platform 21, and the upper skin 1 is bonded and fixed to the lower skin 2 via the recessed platform 21 of the lower skin 2.

[0044] The recessed platform 21 can quickly locate the bonding position of the upper skin 1 and the lower skin 2, avoiding assembly misalignment. At the same time, the boss structure can increase the bonding contact area between the skins to a certain extent, improving the connection stability of the upper and lower skins 2.

[0045] Multiple sets of partition frames 34 are equidistantly arranged on the beam plate 31. There are four sets of partition frames 34. Two sets of partition frames 34 are located on the side of the front wing connecting frame 36 away from the rear wing connecting frame 37, and two sets of partition frames 34 are located on the side of the rear wing connecting frame 37 away from the front wing connecting frame 36. The partition frames 34 are connected to the beam plate 31 by adhesive bonding. The partition frames 34 are used to maintain the shape of the rotor arm and improve the structural stability of the beam plate 31.

[0046] The four sets of partition frames 34, which are equidistantly distributed and placed on the outside of the front and rear wing connecting frames 37, can form a stable structure with the beam plate 31 through adhesive bonding, effectively maintaining the overall shape accuracy of the rear rotor arm wrapped by the upper skin 1 and lower skin 2, and preventing the skin from deforming due to stress or vibration. They can also provide auxiliary support for the beam plate 31, enhance the bending resistance and structural stability of the beam plate 31 during load transfer, and thus improve the structural reliability of the integral EVTOL rotor arm, adapting to the stress requirements of EVTOL during flight.

[0047] The inner side of the beam plate 31 is provided with multiple sets of brackets 35, which are used to install evtol parts.

[0048] By setting multiple sets of brackets 35 on the inner side of the beam plate 31, a dedicated and stable mounting carrier can be provided for EVTOL parts, avoiding structural interference caused by direct contact between the parts and the beam plate 31 or skin. EVTOL parts can be used as matching control harness fixing parts for motors, and sensors (such as stress sensors and temperature sensors) for monitoring arm stress or motor operating status. These parts need to be installed close to the motor or the core load-bearing part of the arm to achieve signal acquisition and wiring neatness.

[0049] The motor mount 32 is connected to the support frame 33 via detachable bolts.

[0050] The detachable bolt connection method ensures a stable connection between the motor mount 32 and the support frame 33, guaranteeing the structural reliability of the drive motor under load transmission and flight vibration environments after installation. On the other hand, when it is necessary to change the motor model or inspect the motor mount 32 or the support frame 33, the two can be quickly separated by removing the bolts without disassembling other core components of the support arm, significantly improving maintenance convenience.

[0051] The front wing connecting frame 36 and the rear wing connecting frame 37 have the same structural dimensions and are symmetrically arranged along the length direction of the beam plate 31, so that the load transmission paths at both ends of the support arm remain symmetrical and balanced.

[0052] The front wing connecting frame 36 and the rear wing connecting frame 37 are connected by a combination of adhesive bonding and bolts, and are fixed symmetrically on both sides of the beam plate 31 along its length. This ensures that the installation positions and connection methods of the two on the beam plate 31 are completely symmetrical. The beneficial effect is that the front and rear wing connecting frames 37, which have the same structural dimensions and are symmetrically arranged, allow the loads transmitted from the motors at both ends of the outrigger to the beam plate 31 through the loading structure to be evenly transmitted to the wing along the symmetrical connecting frame path. This avoids load transmission offset caused by asymmetry in the structure or position of the connecting frames, effectively balances the forces at both ends of the outrigger, reduces the additional bending moment on the wing, and lowers the load-bearing pressure on the wing. At the same time, the symmetrical structure also simplifies the processing and assembly positioning of the connecting frames, which meets the design requirements of the integral EVTOL rotor outrigger for load transmission stability and structural assembly convenience.

[0053] The rest of this embodiment is the same as that in Embodiment 1. Features not explained in this embodiment are explained using the methods in Embodiment 1, and will not be repeated here.

[0054] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A unitary evtol rotor boom, characterized by: It includes a frame (3), an upper skin (1) and a lower skin (2) located on the upper and lower sides of the frame (3) respectively; the upper skin (1) and the lower skin (2) cover each other to form a accommodating chamber for accommodating the frame (3), the frame (3) includes a beam plate (31) and two sets of loading structures respectively set at both ends of the beam plate (31), the loading structures are used to install the drive motor of the external EVTOL.

2. An integral evtol rotor boom according to claim 1, characterized in that: The loading structure includes two sets of support frames (33) respectively set at both ends of the beam plate (31), and two sets of motor mounts (32) respectively set on the two sets of support frames (33). The external evtol drive motor is installed on the motor mounts (32).

3. An integral evtol rotor arm according to claim 1, wherein: The beam plate (31) is provided in two sets. The beam plate (31) has a C-shaped structure. The beam plate (31) includes a main beam web plate (311) and two sets of main beam edge strips (312) respectively disposed at both ends of the main beam web plate (311). The two sets of main beam edge strips (312) are located on the same side of the main beam web plate (311). The main beam edge strips (312) and the main beam web plate (311) are integrally formed.

4. An integral evtol rotor arm according to claim 1, wherein: The frame (3) also includes a front wing connecting frame (36) and a rear wing connecting frame (37) set on the beam plate (31). The front wing connecting frame (36) and the rear wing connecting frame (37) are both bonded to the side wall of the beam plate (31) by structural adhesive (39). The wing connecting frame is provided with a first mounting hole, and the beam plate (31) is provided with a second mounting hole connected to the first mounting hole. External bolts pass through the first mounting hole and the second mounting hole in sequence to install the connecting frame on the beam plate (31).

5. A unitary evtol rotor spar according to claim 4, wherein: The beam plate (31) is provided with a pad (38) on the side near the external bolt. The pad (38) is bonded to the connection between the second mounting hole of the beam plate (31) and the external bolt via the structural adhesive (39). The pad (38) is used to reduce the connection stress of the external bolt on the beam plate (31).

6. The integral EVTOL rotor arm according to claim 1, characterized in that: The lower skin (2) is provided with a recessed platform (21), and the upper skin (1) is bonded and fixed to the lower skin (2) via the recessed platform (21) of the lower skin (2).

7. The integral EVTOL rotor arm according to claim 4, characterized in that: Multiple sets of partition frames (34) are equidistantly arranged on the beam plate (31). There are four sets of partition frames (34). Two sets of partition frames (34) are located on the side of the front wing connecting frame (36) away from the rear wing connecting frame (37), and two sets of partition frames (34) are located on the side of the rear wing connecting frame (37) away from the front wing connecting frame (36). The partition frames (34) are connected to the beam plate (31) by adhesive bonding. The partition frames (34) are used to maintain the shape of the rotor arm and improve the structural stability of the beam plate (31).

8. The integral EVTOL rotor arm according to claim 1, characterized in that: The beam plate (31) is provided with multiple sets of brackets (35) on its inner side, and the brackets (35) are used to install evtol parts.

9. The integral EVTOL rotor arm according to claim 2, characterized in that: The motor mount (32) is connected to the support frame (33) via detachable bolts.

10. An integral EVTOL rotor arm according to claim 4, characterized in that: The front wing connecting frame (36) and the rear wing connecting frame (37) have the same structural dimensions and are symmetrically arranged along the length direction of the beam plate (31) so that the load transmission paths at both ends of the support arm remain symmetrical and balanced.

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