Wheel hub, aircraft wheel and aircraft

Abstract

The application discloses a machine wheel hub, an aircraft wheel and an aircraft. A nipple-shaped structure is arranged on the butt joint surface of at least one of the inner half hub and the outer half hub of the machine wheel hub, which can improve the bending resistance of the hub spoke, reduce the stress of the spoke and the bolt hole, and the nipple-shaped structure has a simple forming process without complex milling processing, thereby improving the service life and reliability of the machine wheel while reducing the cost. A smooth transition structure is used to transitionally connect between the sealing ring groove and the rim on the inner half hub, which can reduce the stress concentration at the sealing ring groove, and a sealing ring installation guide cone is further arranged on the outer half hub, which can avoid the twisting of the sealing ring during the installation of the machine wheel, and improve the maintainability of the machine wheel. The machine wheel hub is designed in details, and can meet the design requirements of light weight, long service life, high reliability, good maintainability and low cost on the basis of meeting the basic technical requirements, and overcomes the problems in the prior art.

Description

Technical Field

[0001] This invention relates to the field of aviation technology, and in particular to a wheel hub, an aircraft wheel, and an aircraft. Background Technology

[0002] Aircraft wheels and their matching tires are used for ground parking, taxiing, and absorbing impact loads during landing. Aircraft wheels generally consist of a main landing gear wheel and a nose landing gear wheel; the main landing gear wheel has brakes, while the nose landing gear wheel does not. Currently, aircraft wheel hubs, in addition to strictly meeting specified technical requirements, are also required to meet design requirements such as light weight, long service life, high reliability, good maintainability, and low cost. However, existing aircraft wheel hubs do not meet these requirements. Therefore, it is necessary to propose a new type of aircraft wheel to meet the current high design requirements for aircraft wheel hubs. Summary of the Invention

[0003] The purpose of this invention is to provide a wheel hub, an aircraft wheel, and an aircraft to solve the problem that existing aircraft wheel hubs cannot simultaneously meet the design requirements of light weight, long service life, high reliability, good maintainability, and low cost.

[0004] To achieve the above objectives, the present invention provides the following solution:

[0005] This invention provides a wheel hub, comprising an inner half-hub and an outer half-hub, wherein the inner half-hub and the outer half-hub are coaxially connected and fastened together by bolts and nuts; a sealing ring is provided at the joint between the inner half-hub and the outer half-hub; on the joint surface of at least one of the inner half-hub and the outer half-hub, a plurality of nipple-shaped structures are evenly distributed circumferentially, the tip of any nipple-shaped structure is facing the center of the wheel hub, and a bolt hole is provided on the large end of any nipple-shaped structure for the bolt to pass through.

[0006] Optionally, the nipple-shaped structure is provided on the mating surface of both the inner half-hub and the outer half-hub, and the nipple-shaped structure on the inner half-hub and the nipple-shaped structure on the outer half-hub are provided in a one-to-one correspondence.

[0007] Optionally, a sealing ring groove is provided on the outer periphery of the end of the inner half-hub that connects with the outer half-hub, and the sealing ring is disposed in the sealing ring groove; the end of the outer half-hub that connects with the inner half-hub is sleeved outside the sealing ring groove, and a sealing ring mounting guide cone is provided on the inner wall of the end of the outer half-hub that connects with the inner half-hub.

[0008] Optionally, a smooth transition structure is provided between one end of the sealing ring groove and the rim of the inner half of the wheel hub, and a positioning surface is provided at the other end of the sealing ring groove for centering the wheel hub bearing; the inner wall of the outer half of the wheel hub is provided with a positioning lip that matches the positioning surface, and the positioning lip is inserted into the positioning hole to ensure the coaxiality of the wheel hub bearing and the wheel hub.

[0009] Optionally, the inner half-hub and the outer half-hub are provided with a reinforcing structure at the tire bead seat.

[0010] Optionally, the inner half of the wheel hub and the spokes, as well as the rim and the spokes, and the outer half of the wheel hub and the spokes, are all connected by a transition fillet, and the surface roughness of the transition fillet is not greater than Ra1.6.

[0011] Optionally, both the inner half-hub and the outer half-hub are further provided with tapered roller bearings and oil retainer rings.

[0012] Optionally, a valve stem mounting hole is provided on the outer side of the spoke plate of the outer half of the hub, and a valve stem and valve core assembly are provided at the valve stem mounting hole.

[0013] The present invention also proposes an aircraft wheel, comprising a tire and a wheel hub as described above, wherein the tire is fitted around the outer periphery of the wheel hub.

[0014] Optionally, the aircraft wheels are either the nose wheel or the main wheel.

[0015] The present invention also proposes an aircraft, characterized in that it includes a fuselage and aircraft wheels as described above.

[0016] The present invention achieves the following technical effects compared to the prior art:

[0017] The wheel hub proposed in this invention, through detailed design, not only meets basic technical requirements but also satisfies design requirements such as light weight, long service life, high reliability, good maintainability, and low cost, as detailed below:

[0018] 1. A nipple-like structure is provided on the mating surface of at least one of the inner and outer half-hubs, which can improve the bending resistance of the hub spokes, reduce the stress on the spokes and bolt holes, and the nipple-like structure has a simple forming process without complex milling, which improves the wheel life and reliability while keeping the cost low.

[0019] 2. A smooth transition structure is used between the sealing ring groove on the inner half of the hub and the rim, which reduces stress concentration at the sealing ring groove, improves the load-bearing capacity and fatigue resistance of this part, and increases the wheel's life and reliability. In addition, a sealing ring installation guide cone is provided at the outer half of the hub to prevent the sealing ring from twisting during wheel installation, thus improving wheel maintainability.

[0020] 3. The sealing ring groove is equipped with a positioning structure for centering the inner and outer half-hub bearings. The inner half-hub is the positioning surface, and the outer half-hub is the positioning lip. The positioning lip and the positioning surface are connected by a hole-shaft insertion fit, which ensures the coaxiality of the tapered roller bearing with the hub during operation and improves the bearing's service life, reliability and maintainability.

[0021] 4. A reinforced structure is installed at the bead seat, which increases the thickness of the bead seat locally on the outside, thereby improving the rigidity of the bead seat, dispersing the tire contact pressure, reducing stress, and improving wheel life and reliability.

[0022] 5. The inner half of the wheel hub and the spokes, as well as the rim and the spokes, and the outer half of the wheel hub and the spokes, all use transition fillets for transition. The surface roughness of the transition fillets is no greater than Ra1.6. This structure can improve the load-bearing capacity and fatigue resistance between the hub and the spokes, as well as between the rim and the spokes, thereby improving the wheel's life and reliability.

[0023] 6. Except for the nipple-shaped structure, the machine wheel hub can be formed by simple milling without the need for milling of complex curved surfaces. The process is relatively simple. The bolt holes are simple through holes, and the process is also simple. The rest of the hub is turned, which is also simple. The machine wheel hub has a simple process, low cost, and good economic efficiency.

[0024] By adopting the above design, the wheel can meet the technical requirements while achieving the effects of light weight, long service life, high reliability, good maintainability and low cost, thus overcoming the problems existing in the prior art.

[0025] The aircraft wheel proposed in this invention uses the aforementioned wheel hub and possesses all the characteristics of the aforementioned wheel hub, which will not be repeated here.

[0026] The aircraft proposed in this invention uses the aforementioned aircraft wheels and possesses all the characteristics of the aforementioned aircraft wheels, which will not be repeated here. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure of the wheel hub disclosed in the embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the inner half-hub structure disclosed in an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the sealing ring groove on the inner half of the hub disclosed in an embodiment of the present invention;

[0031] Figure 4 for Figure 3 Enlarged structural diagram at point A;

[0032] Figure 5 This is a schematic diagram of the structure for mounting a guide cone on the sealing ring of the outer half of the hub as disclosed in an embodiment of the present invention;

[0033] Figure 6 for Figure 5 Enlarged structural diagram at point B;

[0034] Figure 7 This is a schematic diagram of the bead seat reinforcement structure and transition fillet disclosed in the embodiments of the present invention.

[0035] The attached figures are labeled as follows:

[0036] 100. Wheel hub;

[0037] 1. Inner half-hub; 2. Outer half-hub; 3. Bolt; 4. Nut; 5. Washer; 6. Sealing ring; 7. Nipple-shaped structure; 8. Bolt hole; 9. Sealing ring groove; 10. Sealing ring mounting guide cone; 11. Smooth transition structure; 111. Surface 1; 112. Fillet; 113. Surface 2; 12. Positioning surface; 13. Positioning lip; 14. Reinforcing structure; 15. Transition fillet; 16. Tapered roller bearing; 17. Oil retainer ring; 18. Valve nozzle mounting hole; 19. Valve nozzle. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] One of the objectives of this invention is to provide an aircraft wheel hub that solves the problem that existing aircraft wheel hubs cannot simultaneously meet the design requirements of light weight, long service life, high reliability, good maintainability, and low cost.

[0040] Another object of the present invention is to provide an aircraft wheel having the above-mentioned wheel hub.

[0041] Another object of the present invention is to provide an aircraft having the aforementioned aircraft wheels.

[0042] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] Example 1

[0044] like Figures 1 to 7 As shown, this embodiment provides a wheel hub 100, including an inner half-hub 1 and an outer half-hub 2. The inner half-hub 1 and the outer half-hub 2 are coaxially connected and fastened together by bolts 3 and nuts 4. A sealing ring 6 is provided at the joint between the inner half-hub 1 and the outer half-hub 2. On the joint surface of at least one of the inner half-hub 1 and the outer half-hub 2, a plurality of nipple-shaped structures 7 are evenly distributed circumferentially. The tip of any nipple-shaped structure 7 faces the center of the wheel hub, and a bolt hole 8 is provided on the large end of any nipple-shaped structure 7 for the bolt 3 to pass through, so that the bolt 3 can connect the inner half-hub 1 and the outer half-hub 2 into a whole during assembly. The aforementioned inner half-hub 1 and outer half-hub 2 are generally manufactured from high-strength aluminum alloy forging blanks. The axial lengths of the inner half-hub 1 and the outer half-hub 2 are basically the same, thus making the wheel hub 100 a split structure.

[0045] In this embodiment, nipple-shaped structures 7 are provided on the mating surfaces of both the inner half-hub 1 and the outer half-hub 2. The nipple-shaped structures 7 on the inner half-hub 1 and the outer half-hub 2 correspond one-to-one, and the bolt holes 8 on the nipple-shaped structures 7 are coaxially aligned, allowing the bolt 3 to pass through and be tightened with the corresponding nut 4. The nut 4 is preferably a self-locking nut. Generally, as... Figure 1 As shown, the bolt 3 passes through the bolt hole 8 on the inner half-hub 1 and the bolt hole 8 on the outer half-hub 2 in sequence. Washers 5 are provided between the head of the bolt 3 and the inner half-hub 1, and between the nut 4 and the outer half-hub 2. The washers 5 are fitted onto the bolt 3.

[0046] like Figure 2 As shown, the mating surfaces of the inner half-hub 1 and the outer half-hub 2 are evenly distributed with multiple nipple-shaped structures 7 along the circumference. At each set of opposing nipple-shaped structures 7, the inner half-hub 1 and the outer half-hub 2 are fastened together by a set of bolts 3 and nuts 4. This ensures a reliable connection and even stress distribution between the inner half-hub 1 and the outer half-hub 2. Furthermore, the connection method of the bolts 3 and nuts 4 facilitates the assembly and disassembly of the hub.

[0047] In this embodiment, a sealing groove 9 is provided on the outer periphery of the end of the inner half-hub 1 that connects with the outer half-hub 2, and a sealing ring 6 is disposed within the sealing groove 9. The end of the outer half-hub 2 that connects with the inner half-hub 1 is fitted over the sealing groove 9, and a sealing ring mounting guide cone 10 is provided on the inner wall of the end of the outer half-hub 2 that connects with the inner half-hub 1. After the inner half-hub 1 and the outer half-hub 2 are installed, the sealing ring mounting guide cone 10 covers the outer ring of the sealing groove 9, and a cavity for accommodating the sealing ring 6 is formed between the sealing ring mounting guide cone 10 and the sealing groove 9. The sealing ring 6 is placed in this cavity and makes sealing contact with the sealing ring mounting guide cone 10 and the sealing groove 9, thereby ensuring the sealing performance of the wheel hub. Based on this, after the matching tire is fitted onto the outer ring of the hub, the cavity formed between the tire and the inner and outer half-hubs is statically sealed.

[0048] In this embodiment, a smooth transition structure 11 is provided between one end of the sealing ring groove 9 (the end along the hub axis) and the rim of the inner half-hub 1. This smooth transition structure 11 can be a double-sloping rounded corner transition structure or a single-sloping rounded corner transition structure, such as... Figure 4 As shown, the smooth transition structure 11 is a double-sloped rounded corner transition structure, which includes a first slope 111, a second slope 113, and a rounded corner 112 that connects the two.

[0049] Furthermore, in this embodiment, the other end of the sealing ring groove 9 is provided with a positioning surface 12 for centering the hub bearing. The positioning surface 12 is specifically an outer cylindrical surface. Correspondingly, the inner wall of the outer half hub 2 is provided with a positioning lip 13 that is adapted to the positioning surface 12. The positioning lip 13 is inserted into the hole of the positioning surface 12 to ensure the coaxiality of the hub bearing and the hub. Especially when the hub is used in aircraft wheels, the insertion of the positioning lip 13 into the hole of the positioning surface 12 can ensure the coaxiality of the hub bearing and the hub when the wheel is running, which is beneficial to improving the stability and reliability of the wheel.

[0050] In this embodiment, a reinforcing structure 14 is provided at the bead seat of the inner half-hub 1 and the outer half-hub 2, that is, by locally increasing the thickness on the outer side of the bead seat (the thickness of this structure before thickening is generally 5mm).

[0051] With a thickness of ~10mm (the thickness after thickening is 10% to 50% greater than the original structure), the rigidity of the tire bead seat can be improved, the tire contact pressure can be distributed, the stress can be reduced, and the wheel life and reliability can be improved.

[0052] In this embodiment, the transitions between the hub and spokes of the inner half-hub 1, and between the rim and spokes, as well as between the hub and spokes of the outer half-hub 2, and between the rim and spokes, are all achieved through a transition fillet 15. The surface roughness of this transition fillet 15 is no greater than Ra1.6. Specifically, the transition fillet 15 can be a double-circular arc transition or a parabola, or a similar equal-strength design structure. This design improves the load-bearing capacity and fatigue resistance of this part, thereby increasing the wheel's lifespan and reliability.

[0053] In this embodiment, both the inner half-hub 1 and the outer half-hub 2 are provided with bearing mounting holes. A tapered roller bearing 16 and an oil retainer ring 17 are installed on the inner wall of the bearing mounting holes. The oil retainer ring 17 is installed on the hub to prevent grease applied to the tapered roller bearing from being thrown out of the hub and to prevent dust from the external environment from entering the bearing.

[0054] In this embodiment, a valve stem mounting hole 18 is provided on the outer side of the spokes of the outer half-hub 2. A valve stem 19 and a valve core assembly are provided at the valve stem mounting hole 18 for inflating and deflating the wheel, and are mostly used for inflating and deflating tubeless tires. Generally, a valve stem sealing ring is provided between the outer periphery of the valve core assembly and the inner wall of the valve stem mounting hole 18 to prevent air leakage at the valve stem mounting hole 18.

[0055] Therefore, it can be seen that the wheel hub proposed in this solution, through detailed design, not only meets the basic technical requirements, but also meets the design requirements of light weight, long service life, high reliability, good maintainability, and low cost, as detailed below:

[0056] 1. A nipple-like structure is provided on the mating surface of at least one of the inner and outer half-hubs, which can improve the bending resistance of the hub spokes, reduce the stress on the spokes and bolt holes, and the nipple-like structure has a simple forming process without complex milling, which improves the wheel life and reliability while keeping the cost low.

[0057] 2. The inner half of the hub features a smooth transition between the sealing ring groove and the rim using a double-beveled rounded corner transition structure or a single-beveled rounded corner transition. This reduces stress concentration at the sealing ring groove, improves the load-bearing capacity and fatigue resistance of this area, and enhances the wheel's lifespan and reliability. Furthermore, the outer half of the hub is equipped with a sealing ring installation guide cone to prevent the sealing ring from twisting during wheel installation, thus improving wheel maintainability.

[0058] 3. The sealing ring groove is equipped with a positioning structure for centering the inner and outer half-hub bearings. The inner half-hub is the positioning surface, and the outer half-hub is the positioning lip. The positioning lip and the positioning surface are connected by a hole-shaft insertion fit, which ensures the coaxiality of the tapered roller bearing with the hub during operation and improves the bearing's service life, reliability and maintainability.

[0059] 4. A reinforced structure is installed at the bead seat, which increases the thickness of the bead seat locally on the outside, thereby improving the rigidity of the bead seat, dispersing the tire contact pressure, reducing stress, and improving wheel life and reliability.

[0060] 5. The inner half of the wheel hub and the spokes, as well as the rim and spokes, and the outer half of the wheel hub and the spokes, all adopt a double-circular arc transition or a parabola-like equal-strength design structure. At the same time, the surface roughness of the transition fillet is no greater than Ra1.6. This structure can improve the load-bearing capacity and fatigue resistance between the hub and spokes, as well as between the rim and spokes, thereby improving the wheel's life and reliability.

[0061] 6. Except for the nipple-shaped structure, the machine wheel hub can be formed by simple milling without the need for milling of complex curved surfaces. The process is relatively simple. The bolt holes are simple through holes, and the process is also simple. The rest of the hub is turned, which is also simple. The machine wheel hub has a simple process, low cost, and good economic efficiency.

[0062] The above design allows the wheel to meet technical requirements while achieving lightweight, long service life, high reliability, good maintainability, and low cost. It can be used for aircraft wheels, such as the nose wheel, where the inner half-hub 1, outer half-hub 2, and matching aircraft tires form the main sealed cavity.

[0063] Example 2

[0064] This embodiment proposes an aircraft wheel, including a tire and a wheel hub 100 as disclosed in Embodiment 1. The tire is fitted onto the outer circumference of the wheel hub 100, and the inner half-hub 1, the outer half-hub 2, and the tire form the main sealed cavity. The aforementioned tire is prior art, and its details will not be elaborated here.

[0065] The aforementioned aircraft wheels can specifically be the nose wheel of an aircraft or the main engine wheel of an aircraft with a braking structure.

[0066] Example 3

[0067] This embodiment proposes an aircraft, including a fuselage and aircraft wheels as disclosed in Embodiment 2.

[0068] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A wheel hub, characterized in that, The device includes an inner half-hub and an outer half-hub, which are coaxially connected and fastened together by bolts and nuts. A sealing ring is provided at the joint between the inner half-hub and the outer half-hub. On the joint surface of at least one of the inner half-hub and the outer half-hub, a plurality of nipple-shaped structures are evenly distributed circumferentially, with the tip of any nipple-shaped structure pointing towards the center of the wheel hub. A bolt hole is provided on the large end of any nipple-shaped structure for the bolt to pass through.

2. The wheel hub according to claim 1, characterized in that, The nipple-shaped structure is provided on the mating surface of both the inner half-hub and the outer half-hub, and the nipple-shaped structure on the inner half-hub and the nipple-shaped structure on the outer half-hub are provided in a one-to-one correspondence.

3. The wheel hub according to claim 1 or 2, characterized in that, A sealing ring groove is provided on the outer periphery of the end of the inner half-hub that connects with the outer half-hub, and the sealing ring is disposed in the sealing ring groove; the end of the outer half-hub that connects with the inner half-hub is sleeved outside the sealing ring groove, and a sealing ring mounting guide cone is provided on the inner wall of the end of the outer half-hub that connects with the inner half-hub.

4. The wheel hub according to claim 3, characterized in that, A smooth transition structure is provided between one end of the sealing ring groove and the rim of the inner half of the wheel hub, and a positioning surface is provided at the other end of the sealing ring groove for centering the wheel hub bearing; the inner wall of the outer half of the wheel hub is provided with a positioning lip that matches the positioning surface, and the positioning lip is inserted into the positioning hole to ensure the coaxiality of the wheel hub bearing and the wheel hub.

5. The wheel hub according to claim 1 or 2, characterized in that, The inner half-hub and the outer half-hub are provided with a reinforcing structure at the tire bead seat.

6. The wheel hub according to claim 1 or 2, characterized in that, The inner half of the wheel hub and the spokes, as well as the rim and the spokes, and the outer half of the wheel hub and the spokes, are all connected by a transition fillet, and the surface roughness of the transition fillet is no greater than Ra1.

6.

7. The wheel hub according to claim 1 or 2, characterized in that, Both the inner and outer half-hubs are equipped with tapered roller bearings and oil retainer rings.

8. The wheel hub according to claim 1 or 2, characterized in that, The outer half of the wheel hub has a valve stem mounting hole on the outer side of the spoke plate, and a valve stem and valve core assembly are provided at the valve stem mounting hole.

9. An aircraft wheel, characterized in that, It includes a tire and a wheel hub as described in any one of claims 1 to 8, wherein the tire is fitted around the outer periphery of the wheel hub.

10. An aircraft, characterized in that, Includes the fuselage and the aircraft wheels as described in claim 9.

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