EVTOL aircraft ground resonance prevention undercarriage structure

Abstract

The utility model discloses an eVTOL aircraft ground resonance prevention undercarriage structure which comprises two sliding pipes, a transverse pipe is arranged between the two sliding pipes, the two ends of the transverse pipe are connected with the sliding pipes through anti-abrasion plates matched with fasteners, the anti-abrasion plates are of an arc-shaped structure, the connecting positions of the sliding pipes and the transverse pipe are wrapped with vibration isolation pads, and the anti-abrasion plates are connected with the transverse pipe. And the vibration isolation pad is tightly pressed with the anti-abrasion plate through the transverse pipe. The vibration isolation pads are additionally arranged between the sliding pipe and the transverse pipe and between the sliding pipe and the anti-abrasion plate, the transverse pipe is connected with an eVTOL machine body, the anti-abrasion plate makes contact with the ground, vibration transmitted by eVTOL paddles can be isolated by the vibration isolation pads, resonance between the eVTOL paddles and the ground is avoided, and the safety is high.

Description

Technical Field

[0001] The utility model relates to the technical field of aviation equipment, and in particular to an anti-ground resonance landing gear structure for an eVTOL aircraft. Background Art

[0002] The development of eVTOL (Electric Vertical Takeoff and Landing) electric vertical takeoff and landing aircraft has attracted widespread attention from aerospace companies, the automotive industry, the transportation industry, the government, the military and academia. The potential future applications of eVTOL involve a variety of scenarios such as urban passenger transport, regional passenger transport, freight, personal aircraft, and emergency medical services. The American Vertical Flight Association believes that eVTOL technology is one of the most important technological changes in the aviation industry since the birth of the helicopter 75 years ago, and may be more revolutionary than the emergence of turbine engines. According to the "World Electric Vertical Takeoff and Landing (eVTOL) Aircraft Directory" published online by the association, there are currently more than 260 projects engaged in eVTOL development around the world. The use of electric propulsion systems instead of internal combustion engine power has gained 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, low noise and vibration levels, and good ride comfort. It is a truly environmentally friendly aircraft. In addition, it is also safe and reliable (no explosion and fuel leakage), simple structure, easy operation and use, good maintainability / low cost, and good economy. There are also many advantages in design: the overall layout is flexible, and both optimal layout and unconventional / innovative layout can be adopted; aircraft with extraordinary performance can be designed to meet special purpose requirements, etc.

[0003] Each blade and motor of the eVTOL aircraft is a vibration source, and the rotation speed of each blade is different during takeoff and landing, causing multiple blade vibration sources to superimpose on each other, resulting in a particularly complex vibration frequency. When the landing gear contacts the ground, if the blade vibration frequency or the superimposed frequency is the same as the landing gear's own natural frequency, it will cause resonance problems and damage the landing gear. Utility Model Content

[0004] The purpose of the utility model is to provide an anti-ground resonance landing gear structure for 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 anti-ground resonance landing gear structure for an eVTOL aircraft, comprising a sliding tube, wherein two sliding tubes are provided, a cross tube is provided between the two sliding tubes, and both ends of the cross tube are connected to the sliding tube by anti-wear plates and fasteners, the anti-wear plates are arc-shaped structures, and the connection between the sliding tube and the cross tube is coated with a vibration isolation pad, and the vibration isolation pad is pressed by the cross tube and the anti-wear plate.

[0005] Preferably, the vibration isolation pad comprises an upper vibration isolation pad and a lower vibration isolation pad, and avoidance holes are provided on the upper vibration isolation pad and the lower vibration isolation pad.

[0006] Preferably, an arc-shaped connecting surface is provided at the end of the transverse tube, and the arc-shaped connecting surface is pressed against the vibration isolation pad by a fastener.

[0007] Preferably, the vibration isolation pad is a rubber material part, and the anti-wear plate is a structural part selected from steel, glass fiber composite material or aramid fiber composite material.

[0008] Preferably, the fasteners include bolts and nuts.

[0009] Technical effects and advantages of the utility model: The structure is highly safe: a vibration isolation pad is added between the sliding tube, the cross tube and the wear plate, the cross tube is connected to the eVTOL body, and the wear plate is in contact with the ground. When the vibration transmitted from the eVTOL blade is isolated by the vibration isolation pad, resonance with the ground is avoided, and the safety is high;

[0010] Low cost: The vibration isolation pad is made of soft material and needs to be replaced when its service life expires. The cross tube, sliding tube and anti-wear plate are connected by detachable fasteners. The vibration isolation pad can be replaced by removing the fasteners.

[0011] Easy to dismantle and replace: The vibration isolation pad is made of soft material. When its service life expires, it needs to be replaced. The cross tube, sliding tube and anti-wear plate are connected by detachable fasteners. The vibration isolation pad can be replaced by removing the fasteners.

[0012] Long service life: A wear plate is installed at the bottom of the vibration isolation pad. Every time the eVTOL aircraft lands, only the wear plate is worn, and the sliding tube and cross tube are not damaged, so the service life is long. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is an axonometric drawing of the utility model;

[0014] Figure 2 It is an axonometric view of the point where the utility model contacts the ground;

[0015] Figure 3 This is an exploded view of the contact point between the electric regulator and the ground of the utility model;

[0016] Figure 4 This is an axonometric diagram of the vibration isolation pad of the utility model;

[0017] Figure 5 It is a transverse cross-sectional view of the connection area of ​​the vibration isolation pad of the utility model.

[0018] In the figure, 1. anti-ground resonance landing gear; 11. cross tube; 12. slide tube; 13. wear plate; 14. vibration isolation pad; 141. upper vibration isolation pad; 142. lower vibration isolation pad; 15. fastener; 16. connector. DETAILED DESCRIPTION

[0019] 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.

[0020] Example

[0021] like Figure 1 As shown, the upper part of the anti-ground resonance landing gear 1 is connected to the eVTOL aircraft through a connecting piece, and the lower part is in contact with the ground. When the eVTOL aircraft takes off and lands, it supports the weight of the entire eVTOL aircraft. When the lift of the propeller is less than the gravity, the landing gear is kept in contact with the ground; when the eVTOL aircraft completes takeoff, it hangs in the air.

[0022] like Figure 2 and Figure 3As shown, the anti-ground resonance landing gear 1 includes a cross tube 11, a slide tube 12, a wear plate 13, a vibration isolation pad 14 and a fastener 15, wherein two slide tubes 12 are provided, and the front and rear cross tubes 11 are connected between the two slide tubes 12 to improve the rigidity in the front and rear directions, and the force is small. Considering the lightweight requirements, aluminum alloy materials are used, and the material of this example is 7075 aluminum alloy. The cross tube 11 bears the weight of the entire eVTOL aircraft and the impact during landing, and has high requirements for performance and weight. It is preferably supported by high-strength steel, preferably steel with a strength greater than 1600MPa. The two ends of the cross tube 11 are provided with arc-shaped connecting surfaces 111, which are connected to the slide tube 12 through the wear plate 13 and the fastener 15. The wear plate 13 is an arc-shaped structure, and the wear plate 13 is in contact with the ground when in use. When the eVTOL aircraft lands, it may have a certain forward speed or lateral speed, and there is relative sliding between the wear plate 13 and the ground, which will cause certain damage to the wear plate 13. Therefore, the wear plate 13 needs to be made of wear-resistant materials, which can be steel, glass fiber composite materials, aramid fiber composite materials. In this example, 15-5PH stainless steel material is used. The vibration isolation pad 14 is a soft material, which is coated at the connection between the slide tube 12 and the cross tube 11, and is pressed by the cross tube 11 and the wear plate 13. The vibration isolation pad 14 isolates the rigid body vibration between the cross tube 11 and the wear plate 13, reduces the vibration of the landing gear and the ground, avoids ground resonance, and damages the landing gear. In this example, the vibration isolation pad 14 is made of rubber and has a compression amount of 10%. The fasteners 15 are used to connect the structures together and are detachable. In this example, bolts and nuts are used.

[0023] like Figure 4 As shown, the vibration isolation pad 14 is divided into two parts, including an upper vibration isolation pad 141 and a lower vibration isolation pad 142. Since the cross tube 11 has a curvature shape, it cannot be fitted if a circular ring structure is used. It is divided into two parts. A flat plate can be curled on the surface of the sliding tube 12 to reduce costs. At the same time, it is divided into two parts, which is convenient for replacement during disassembly and replacement. Avoidance holes are opened on the upper vibration isolation pad 141 and the lower vibration isolation pad 142 for avoiding the fasteners 15 and the cross tube 11, so that the vibration isolation pad 14 and the sliding tube 12 can fit together.

[0024] like Figure 5 As shown, the transverse tube 11 and the anti-wear plate 13 hold the slide tube 12, and then the fastener 15 is used to connect the combination together to ensure reliable connection. When subjected to force, the structure will not fall apart. The vibration isolation pad 14 is made of soft material. In order to ensure that the fastener 15 can be connected reliably, the thickness of the vibration isolation pad 14 before compression is greater than the actual required thickness, and a certain amount of compression is required to ensure a certain compression strength and ensure safe connection. The compression amount in this example is 10%.

[0025] 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 anti-ground resonance landing gear structure for an eVTOL aircraft, comprising a slide tube, characterized in that: There are two sliding tubes, and a transverse tube is arranged between the two sliding tubes. Both ends of the transverse tube are connected to the sliding tubes through anti-wear plates and fasteners. The anti-wear plates are arc-shaped structures. The connection between the sliding tube and the transverse tube is covered with a vibration isolation pad, and the vibration isolation pad is pressed by the transverse tube and the anti-wear plate.

2. The anti-ground resonance landing gear structure for an eVTOL aircraft according to claim 1, characterized in that: The vibration isolation pad comprises an upper vibration isolation pad and a lower vibration isolation pad, and avoidance holes are provided on the upper vibration isolation pad and the lower vibration isolation pad.

3. The anti-ground resonance landing gear structure for an eVTOL aircraft according to claim 1, characterized in that: The end of the transverse tube is provided with an arc-shaped connecting surface, and the arc-shaped connecting surface is pressed against the vibration isolation pad through a fastener.

4. The anti-ground resonance landing gear structure for an eVTOL aircraft according to claim 1, characterized in that: The vibration isolation pad is a rubber material, and the anti-wear plate is a structural member made of steel, glass fiber composite material or aramid fiber composite material.

5. The anti-ground resonance landing gear structure for an eVTOL aircraft according to claim 1, characterized in that: The fasteners include bolts and nuts.

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