Easily-assembled connecting structure for eVTOL aircraft motor arm

Abstract

The utility model discloses an eVTOL aircraft motor arm easy assembly connecting structure which comprises a motor arm, the rear end of the motor arm is connected with a motor arm frame, the motor arm frame is connected with a wing frame through a fastener, the wing frame is installed on the front section of a wing, the wing and the motor arm are both provided with operation openings, opening covers are installed on the operation openings, and the motor arm frame is connected with the wing frame through a fastener. The wing frame and the motor arm frame are located between the two operation openings. When the motor arm is installed, the motor arm is attached to the wing upwards from the lower portion, plane fit is achieved in the front-back direction, curved face fit is achieved at the lower portion, a sleeving structure is avoided, and the requirement for precision is low. The bolt and the nut are adopted for connection, and when the threads of the fastener are disassembled for a certain number of times, the bolt and the nut can be replaced by new bolts and new nuts, so that disassembly and assembly are completed; during assembling, the matching area is in plane matching, and compared with curved surface matching, the assembling difficulty is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of aviation equipment, and in particular to an easy-to-assemble connection structure for an eVTOL aircraft motor arm. Background Art

[0002] The eVTOL (Electric Vertical Takeoff and Landing) electric vertical takeoff and landing aircraft uses an electric propulsion system instead of an internal combustion engine, which gives it many advantages and unique qualities. The most prominent advantages are energy saving and environmental protection, high efficiency and low energy consumption, while achieving near-zero emissions, very low noise and vibration levels, and good ride comfort. It is a truly environmentally friendly aircraft. In addition, it is safe and reliable, simple in structure, easy to operate and use, good maintainability / low cost, and good economy. There are also many advantages in design: the overall layout is flexible, and the optimal layout and unconventional / innovative layout can be adopted; aircraft with extraordinary performance can be designed to meet special purpose needs, etc.

[0003] The motor arm of the existing eVTOL aircraft is directly connected to the fuselage, wing, and tail structure to provide support for the motor arm and bear the lift transmitted by the motor arm. Due to the range limitation of the eVTOL aircraft, the motor arm and the wing are arranged in a cross shape, which occupies a large space. When delivering to customers and transferring needs, it needs to be transported. Designing the connection between the motor arm and the wing as a detachable structure for separate transportation can effectively save transportation space and reduce the grade of the transportation road. At the same time, during the operation process, there will be problems such as damaged components that need to be replaced. The motor arm is designed as a detachable structure, which also provides convenience for replacement and reduces costs. The motor arm is connected to large equipment such as motors and motor controllers, and the motor arm also needs to be disassembled during maintenance. The existing eVTOL aircraft motor arm connection structure, such as the Chinese utility model patent "A kind of eVTOL aircraft motor arm connection structure" with application number 202221785279.5, is complicated to assemble and cannot be disassembled and installed multiple times, which will limit the number of transportation and maintenance, and limit the delivery and operation of eVTOL aircraft. Utility Model Content

[0004] The purpose of the utility model is to provide an easy-to-assemble connection structure for the motor arm of an eVTOL aircraft to solve the problems mentioned in the background technology. To achieve the above purpose, the utility model provides the following technical solutions: an easy-to-assemble connection structure for the motor arm of an eVTOL aircraft, comprising a motor arm, the rear end of the motor arm is connected to a motor arm frame, the motor arm frame is connected to a wing frame through a fastener, the wing frame is installed on the front section of the wing, the wing and the motor arm are both provided with an operation port, a cover is installed on the operation port, and the wing frame and the motor arm frame are located between the two operation ports.

[0005] Preferably, the wing frame is an annular structure, and the wing frame is provided with reinforcing ribs along the circumference, the reinforcing ribs connect the edge strips and the web of the wing frame, a thickened area is provided on the web at the upper end of the wing frame, a connecting hole is opened on the thickened area, and a platform is provided on the edge strip at the lower end of the wing frame.

[0006] Preferably, the motor arm frame structure is similar to the wing frame structure, and a connecting edge strip is connected to the bottom of the motor arm frame.

[0007] Preferably, the fastener comprises an upper fastener and a lower fastener, the upper fastener is a raised head bolt assembly, and the lower fastener is a countersunk head bolt assembly.

[0008] Preferably, the upper portion of the motor arm frame is connected to the thickened area on the wing frame via an upper fastener.

[0009] Preferably, the connecting edge strip of the motor arm frame is connected to the platform on the wing frame through a lower fastener.

[0010] The technical effects and advantages of the utility model: the assembly precision of the structure is low: when installing the motor arm, it is enough to fit the wing from the bottom to the top, with a flat fit in the front and rear directions and a curved fit in the bottom, avoiding the sleeve structure and having low precision requirements;

[0011] High safety: According to the characteristics of the motor arm being subjected to the motor tension, the lower fasteners are subjected to shear loads and the upper fasteners are subjected to compression loads, which avoids the fasteners from being pulled and improves the safety of the connection;

[0012] Can be disassembled and assembled multiple times: It is connected by bolts and nuts. When the threads of the fasteners have been disassembled a certain number of times, new bolts and nuts can be replaced to complete the disassembly and assembly;

[0013] Easy to assemble: During assembly, the mating area is a flat surface, which greatly reduces the difficulty of assembly compared to curved surface mating. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the axonometric drawing of the utility model;

[0015] Figure 2 This is an exploded view of the utility model;

[0016] Figure 3 It is an axonometric view of the wing frame of the utility model;

[0017] Figure 4 This is a cross-sectional view of the connection between the wing frame and the motor arm frame at the lower part of the utility model;

[0018] Figure 5 This is a cross-sectional view of the connection between the wing frame and the motor arm frame at the upper part of the utility model;

[0019] Figure 6 This is a schematic diagram of the position of the utility model on the eVTOL aircraft.

[0020] Numbers in the figure: 1. Motor arm connection structure; 11. Motor arm; 111. Motor arm frame; 1111. Connection flange; 12. Wing; 121. Wing frame; 1211. Reinforcement rib; 1212. Platform; 1213. Thickened area; 1214 flange; 1215. Web; 13. Cover; 14. Fastener; 141. Raised head bolt assembly; 142. Countersunk bolt assembly; 2. eVTOL aircraft. DETAILED DESCRIPTION

[0021] In order to make the technical means for realizing the utility model, creative features, objectives and effects easy to understand, the utility model is further explained below in conjunction with specific diagrams. In the description of the utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, an integral connection or a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two components.

[0022] Example

[0023] like Figure 6 The figure shows a schematic diagram of the position of the motor arm connection structure 1 on the eVTOL aircraft 2. The motor arm is arranged at the front and rear ends of the wing. When it needs to be transported, it is connected to the wing for transportation, which occupies a large space. The motor arm needs to be disassembled to save transportation space and then installed after arriving at the airport. Therefore, it needs to meet the requirements of multiple disassembly and installation.

[0024] like Figure 1 and Figure 2 As shown, the motor arm connection structure 1 includes a motor arm 11, a wing 12, a cover 13, and a fastener 14. The rear end of the motor arm 11 is connected to a motor arm frame 111, and the motor arm frame 111 is connected to a wing frame 121 through a fastener 14. The wing frame 121 is installed at the front section of the wing 12. Both the wing 12 and the motor arm 11 are provided with operation ports, and the cover 13 is installed on the operation port. The wing frame 121 and the motor arm frame 111 are located between the two operation ports; wherein the cover 13 provides a passage for installing and removing the fastener 14, and is convenient for tools and hands to be placed on both sides to fasten and remove the fastener 14. The motor arm 11 bears the tension of the motor and transfers the load to the wing 12. The wing 12 serves as a support and bears the load of the motor arm 11. The fastener 14 is connected by threading to connect the motor arm 11 and the wing 12 together.

[0025] The motor arm 11 and the wing 12 are connected through the motor arm frame 111 and the wing frame 121. The load of the motor arm 11 is transferred to the motor arm frame 111. The motor arm frame 111 and the wing frame 121 are connected together through the fastener 14, and the wing frame 121 is connected together with the wing 12. The motor arm frame 111 and the wing frame 121 are similar structures, both of which are metal machined parts. The preferred material is 2024 aluminum alloy, the preferred heat treatment state is T351, and the preferred surface treatment state is anodized.

[0026] like Figure 3 As shown, the wing frame 121 is an annular structure, and the wing frame 121 is provided with reinforcing ribs 1211 along the circumference, and the reinforcing ribs 1211 connect the edge strips 1214 and the webs 1215 of the wing frame 121 to provide rigidity and strength. At the same time, the reinforcing ribs 1211 are also connected to the long stringers inside the wing to transmit axial force; a thickened area 1213 is provided at the webs 1215 at the upper end of the wing frame 121, and a connecting hole is opened on the thickened area 1213; a platform 1212 is provided at the edge strips 1214 at the lower end of the wing frame 121, and when the platform 1212 is connected to the lower fastener in the fastener 14, a small installation plane is provided, which cooperates with the nut plane in the lower fastener to ensure that the connecting surface fits and improves the connection reliability. The thickened area 1213 is designed in the area where the upper fastener in the fastener 14 is connected. Since the connection is an out-of-plane connection, the connection stiffness needs to be improved. The upper fastener is mainly subjected to compressive load. In order to prevent the structural damage of the connection area, the thickened area 1213 is partially thickened, which can effectively reduce the stress level of the hole edge and improve the connection safety. The structure of the motor arm frame 111 is similar to that of the wing frame 121. A connecting edge strip 1111 is connected to the bottom connection area. Figure 2 and Figure 5 .

[0027] like Figure 4 and Figure 5 As shown, the fasteners 14 connecting the motor arm 11 and the wing 12 include two types, upper fasteners and lower fasteners. The upper part of the motor arm frame 111 is connected to the thickened area 1213 on the wing frame 121 through the upper fasteners. The upper fasteners are connected by a convex head bolt assembly 141, which is mainly composed of convex head bolts, washers, and self-locking nuts. The convex head bolt connection is more convenient and the tools are easier to use. The connecting edge strip 1111 of the motor arm frame 111 is connected to the platform 1212 on the wing frame 121 through the lower fasteners. The two are connected at the edge strip. In order to maintain aerodynamic smoothness, the lower fasteners use a countersunk bolt assembly 142, which is mainly composed of countersunk bolts, washers and self-locking nuts. When the fasteners 14 are disassembled a certain number of times, the thread may be worn. After changing a set of fasteners 14, the connection between the motor arm 11 and the wing 12 is still effective, which can increase the number of disassembly and assembly and improve the service life.

[0028] The upper connection of the motor arm frame 111 and the wing frame 121 is connected together by a web "back to back" connection, and the mating surface is a plane; the lower connection is connected by a rib, the motor arm frame 111 extends out of the connecting rib 1111, the rib at the bottom of the wing frame 121 is partially lengthened, and then the position matching the connecting rib 1111 is sunken and raised to a certain height. During installation, the motor arm 11 is raised and moved closer to the wing 12, and then it can be installed, which effectively reduces the precision requirements for connection and matching.

[0029] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An easy-to-assemble connection structure for an eVTOL aircraft motor arm, comprising a motor arm, characterized in that: The rear end of the motor arm is connected to the motor arm frame, the motor arm frame is connected to the wing frame through fasteners, the wing frame is installed on the front section of the wing, the wing and the motor arm are both provided with operation openings, the operation openings are provided with covers, and the wing frame and the motor arm frame are located between the two operation openings.

2. The easy-to-assemble connection structure for an eVTOL aircraft motor arm according to claim 1, characterized in that: The wing frame is an annular structure, and is provided with reinforcing ribs along the circumference of the wing frame, the reinforcing ribs connect the edge strips and the web of the wing frame, a thickened area is provided at the web at the upper end of the wing frame, a connecting hole is opened on the thickened area, and a platform is provided at the edge strip at the lower end of the wing frame.

3. The easy-to-assemble connection structure for an eVTOL aircraft motor arm according to claim 2, characterized in that: The motor arm frame structure is similar to the wing frame structure, and a connecting edge strip is connected to the bottom of the motor arm frame.

4. The easy-to-assemble connection structure for an eVTOL aircraft motor arm according to claim 3, characterized in that: The fastener comprises an upper fastener and a lower fastener, wherein the upper fastener is a raised head bolt assembly, and the lower fastener is a countersunk head bolt assembly.

5. The easy-to-assemble connection structure for an eVTOL aircraft motor arm according to claim 4, characterized in that: The upper part of the motor arm frame is connected to the thickened area on the wing frame through an upper fastener.

6. The easy-to-assemble connection structure for an eVTOL aircraft motor arm according to claim 4, characterized in that: The connecting edge strip of the motor arm frame is connected to the platform on the wing frame through the lower fastener.

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