Face gears, transmissions and helicopters

Abstract

The present invention discloses a face gear, a transmission system and a helicopter, and relates to the technical field of transmission structure. The face gear comprises a wheel hub, a gear ring and a web. The wheel hub has a plurality of first winding structures, the gear ring is arranged around the wheel hub at intervals, the gear ring has a plurality of second winding structures, the web is formed into an annular structure, the radial inner end of the web has a plurality of first winding segments arranged at intervals along the circumference, and the radial outer end has a plurality of second winding segments arranged at intervals along the circumference, each first winding segment is wound around a first winding structure and connected between two second winding segments, each second winding segment is wound around a second winding structure and connected between two first winding segments, and the two ends of at least one of the first winding segment and the second winding segment cross and extend. Thus, the gear ring is connected to the wheel hub through the web to form a face gear, which enhances the overall structural strength of the face gear and effectively reduces the overall weight of the face gear.

Description

Technical Field

[0001] The invention relates to the technical field of transmission structures, and in particular to a face gear, a transmission system and a helicopter. Background Art

[0002] Face gears are a type of gear with complex spatial curved surfaces. Face gear transmission has the advantages of being insensitive to installation errors, strong load capacity, large single-stage reduction ratio, and large overlap. Therefore, it is widely used in high-tech fields such as aerospace and automobile manufacturing. Helicopter reducers using face gears have a higher power-to-weight ratio and can effectively reduce the weight of helicopter reducers. However, despite these significant advantages of face gears, their overall weight is relatively large and still needs to be optimized in terms of design methods. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a face gear, a transmission system and a helicopter, wherein the gear ring of the face gear is connected to the hub through a belly web, which effectively reduces the overall weight of the face gear.

[0004] According to an embodiment of the first aspect of the present invention, the face gear includes a hub, a gear ring and a web, the hub has a plurality of first winding structures, the gear ring is arranged around the outside of the hub at intervals, at least one of the two axial ends of the gear ring has a plurality of gear teeth, and the gear ring has a plurality of second winding structures, the web is formed as an annular structure, the radial inner end of the web has a plurality of first winding segments arranged at intervals along the circumferential direction and the radial outer end has a plurality of second winding segments arranged at intervals along the circumferential direction, each first winding segment is wound around a first winding structure and connected between two second winding segments, each second winding segment is wound around a second winding structure and connected between two first winding segments, and the two ends of at least one of the first winding segments and the second winding segments extend crosswise.

[0005] According to the face gear of the embodiment of the present invention, the hub has multiple first winding structures, the first winding segment of the belly net is wound on the first winding structure, that is, the belly net is connected to the hub through the first winding segment, the ring gear has multiple second winding structures, the second winding segment of the belly net is wound on the second winding structure, that is, the belly net is connected to the ring gear through the second winding segment, the first winding segment is connected to the second winding segment, and the ring gear is connected to the hub through the belly net to form a face gear, which enhances the overall structural strength of the face gear and effectively reduces the overall weight of the face gear.

[0006] In some embodiments, the outer peripheral walls of the plurality of first winding structures corresponding to the web are all inscribed in the preset cylindrical surface, and the two ends of the second winding section extend along directions tangent to the preset cylindrical surface respectively.

[0007] In some embodiments, the second winding section includes a first part and two second parts, the first part is located radially outside the second winding structure, the two second parts are respectively connected to both ends of the first part and are respectively located on both sides of the circumferential direction of the second winding structure, and on the cross-section of the face gear, the orthographic projections of the two second parts connected by the first winding section are located on the same straight line.

[0008] In some embodiments, the abdominal net is formed by a carbon fiber rope being wound multiple times in one direction along a closed path.

[0009] In some embodiments, there are multiple belly nets and include a first belly net and a second belly net. The multiple first winding structures corresponding to the first belly net constitute a first group, and the multiple first winding structures corresponding to the second belly net constitute a second group. The first group and the second group are arranged axially at intervals, and the two are respectively arranged on both sides of the axial direction of the gear ring.

[0010] In some embodiments, the first web and the second web have the same shape and are staggered circumferentially, and the plurality of second winding structures corresponding to the first web and the plurality of second winding structures corresponding to the second web are alternately arranged one by one along the circumferential direction.

[0011] In some embodiments, one axial end of the gear ring has gear teeth, and all the second winding structures are located at the other axial end of the gear ring.

[0012] In some embodiments, the second winding structure includes a first stop portion and a second stop portion, the first stop portion protruding from the end surface of the other axial end of the ring gear, the second stop portion is connected to the end of the first stop portion facing away from the ring gear and is spaced apart from the ring gear, and the second stop portion protrudes from the radial outer end surface of the first stop portion.

[0013] According to the transmission system of the second embodiment of the present invention, it includes an input shaft, an output shaft, a driving gear and a driven gear. The driving gear is fixed to the input shaft and meshes with the driven gear. The driven gear is a face gear according to the first embodiment of the present invention, and the hub of the driven gear is fixed to the output shaft.

[0014] According to the transmission system of the embodiment of the present invention, by setting the driven gear as a face gear according to the embodiment of the first aspect of the present invention, the overall structural strength of the driven gear is enhanced, and the overall weight of the transmission system is effectively reduced.

[0015] A helicopter according to an embodiment of the third aspect of the present invention comprises a power system, a rotor system and a transmission system according to an embodiment of the second aspect of the present invention, wherein the transmission system is connected between the power system and the rotor system for transmitting power from the power system to the rotor system.

[0016] The helicopter according to the embodiment of the present invention adopts the above-mentioned transmission system, which facilitates the improvement of the performance and lightweight design of the helicopter.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a schematic diagram of a face gear according to some embodiments of the present invention;

[0020] Figure 2 yes Figure 1 The enlarged view of the point A shown in the middle circle;

[0021] Figure 3 yes Figure 1 A schematic diagram of the gear teeth shown in ;

[0022] Figure 4 yes Figure 3 Another schematic diagram of the gear teeth shown in ;

[0023] Figure 5 yes Figure 3 Another schematic diagram of the gear teeth shown in ;

[0024] Figure 6 yes Figure 3 AA section view shown in;

[0025] Figure 7 yes Figure 1 A schematic diagram of a wheel hub shown in ;

[0026] Figure 8 yes Figure 7 Another schematic diagram of the hub shown in ;

[0027] Fig. 9 yes Figure 8 BB cross-sectional view shown in;

[0028] Fig.10 yes Figure 8 The CC section view shown in ;

[0029] Fig.11 yes Figure 1 Schematic diagram of the first abdominal web shown in;

[0030] Fig.12 yes Fig.11 The enlarged view of the point B indicated by the middle circle;

[0031] Fig.13 yes Fig.11Another schematic diagram of the first abdominal web shown in ;

[0032] Fig.14 yes Figure 1 Schematic diagram of the second abdominal web shown in;

[0033] Fig.15 yes Figure 1 Another schematic diagram of the second abdominal web shown in ;

[0034] Fig.16 yes Fig.15 Schematic diagram of the carbon fiber rope shown in;

[0035] Fig.17 yes Fig.16 The enlarged view of the point D indicated by the middle circle;

[0036] Fig.18 is a schematic diagram of a transmission system according to some embodiments of the present invention;

[0037] Fig.19 yes Fig.18 Another schematic diagram of the transmission system shown in;

[0038] Fig. 20 yes Fig.18 Schematic diagram of the assembly of the input shaft and the driving gear shown in;

[0039] Fig.21 yes Fig. 20 An enlarged view of the point I indicated by the middle circle;

[0040] Fig. 22 yes Fig. 20 An exploded view of the input shaft and driving gear shown in;

[0041] Fig.23 yes Fig.18 The assembly diagram of the transmission system, power system and rotor system shown in FIG.

[0042] Fig.24 is a schematic diagram of a helicopter according to some embodiments of the present invention.

[0043] Reference numerals:

[0044] Helicopter 3000, transmission system 2000, face gear 1000, preset cylinder R, hub 100, first winding structure 120, ring gear 200, gear teeth 220, second winding structure 240, first stop portion 242, second stop portion 244, belly net 300, first winding section 320, second winding section 340, first part 342, second part 344, first belly net 360, first group 362, second belly net 380, second group 382, ​​input shaft 510, output shaft 520, driving gear 530, driven gear 540, shell 550, first barrel portion 552, accommodating cavity 553, second barrel portion 554, first cover plate 556, second cover plate 558, adhesive layer 560, power system 610, rotor system 620, carbon fiber rope 700, fiber filament 710. DETAILED DESCRIPTION

[0045] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0046] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific processes and examples of materials, but those of ordinary skill in the art can be aware of the applicability of other processes and / or the use of other materials.

[0047] Hereinafter, a face gear 1000 according to an embodiment of the first aspect of the present invention will be described with reference to the accompanying drawings.

[0048] like Figure 1-Figure 10As shown, the face gear 1000 includes a hub 100, a gear ring 200 and a web 300, the hub 100 has a plurality of first winding structures 120, the gear ring 200 is arranged around the hub 100 at intervals, at least one of the two axial ends of the gear ring 200 has a plurality of gear teeth 220, and the gear ring 200 has a plurality of second winding structures 240, the web 300 is formed into an annular structure, the radial inner end of the web 300 has a plurality of first winding sections 320 arranged at intervals along the circumferential direction, and the web 3 The radial outer end of 00 has a plurality of second winding segments 340 spaced apart along the circumferential direction, each first winding segment 320 is wound around a first winding structure 120, and each first winding segment 320 is connected between two second winding segments 340, each second winding segment 340 is wound around a second winding structure 240, and each second winding segment 340 is connected between two first winding segments 320, and both ends of at least one of the first winding segment 320 and the second winding segment 340 extend crosswise.

[0049] It can be seen that the belly net 300 is formed into a mesh structure, and the belly net 300 is connected to the wheel hub 100 through the first winding section 320, and the belly net 300 is connected to the ring gear 200 through the second winding section 340. The first winding section 320 and the second winding section 340 are connected, and the ring gear 200 is connected to the wheel hub 100 through the belly net 300. Power can be transmitted between the wheel hub 100 and the ring gear 200 through the belly net 300, which effectively reduces the overall weight of the face gear 1000. The belly net 300 also provides necessary support for the ring gear 200, enhances the overall structural strength of the face gear 1000, and ensures that the ring gear 200 can remain stable during power transmission and rotational motion.

[0050] For example, during the operation of the face gear 1000, especially in an environment with high speed, heavy load or high stability requirements, the ring gear 200 will be subjected to large stress and torque, and the belly net 300 can effectively disperse these stresses to prevent the ring gear 200 from being deformed or broken due to stress concentration. At the same time, the belly net 300 also enhances the overall rigidity of the face gear 1000 and improves the stability and reliability of the face gear 1000 during the transmission process.

[0051] Among them, the two ends of at least one of the first winding section 320 and the second winding section 340 cross-extend, which is beneficial to further increase the overall rigidity and stability of the face gear 1000, especially when subjected to external force or torque, it can effectively disperse stress and reduce the risk of deformation or damage. Moreover, through the cross-extension, the first winding section 320 and the second winding section 340 can be more flexibly arranged in a limited space, so as to make full use of the space between the hub 100 and the ring gear 200, which is beneficial to improve the space utilization efficiency. At the same time, the cross-sectional area of ​​each structure of the belly net 300 (such as the first winding section 320 and the second winding section 340) can be increased, thereby improving the structural reliability of the belly net 300. Moreover, the arrangement of the belly net 300 is not easily restricted, which is particularly suitable for design scenarios with compact and slightly complex structures of the belly net 300.

[0052] It can be understood that in the description of the embodiment of the present invention, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The embodiment of the present invention includes the following multiple schemes: first, the two ends of the first winding section 320 cross and extend; second, the two ends of the second winding section 340 cross and extend; third, the two ends of the first winding section 320 and the second winding section 340 cross and extend. The cross-extended winding sections (at least one of the first winding section 320 and the second winding section 340) can achieve a more flexible layout in a limited space, and the user can flexibly adjust the setting mode of the first winding section 320 and the second winding section 340 according to the specific needs of the actual application scenario.

[0053] Exemplarily, the two ends of the second winding section 340 cross and extend, and the two ends of the second winding section 340 "intersect" in space to form a "node" structure. The two ends of the second winding section 340 are not directly connected. This type of "node" structure enables the belly net 300 to disperse stress more evenly when subjected to force, thereby improving the overall mechanical properties. At the same time, this type of "node" structure is conducive to increasing the effective cross-sectional area of ​​the second winding section 340. The increase in cross-sectional area enables the belly net 300 to withstand greater external forces, thereby improving its bearing capacity and durability. The cross-extension can also make the arrangement of the second winding section 340 more flexible, thereby improving the space utilization efficiency; or, the two ends of the second winding section 340 cross and extend, and the two ends of the second winding section 340 are directly connected to form a connection point of the solid structure, which can more effectively resist the impact and extrusion of external forces, thereby improving the overall strength of the belly net 300, and the manufacture of the solid structure can be simpler and more direct. The solid structure also reduces potential failure points caused by node problems, thereby improving the reliability of the belly net 300.

[0054] It should be noted that, in the embodiment of the present invention, the existence of the "node" structure means that the extension directions of the two ends of the second winding segment 340 are not parallel, and the two ends of the second winding segment 340 "intersect" in space, which means that the orthographic projections of the corresponding parts of the two ends of the second winding segment 340 on the cross section of the face gear 1000 have an intersection. As for the corresponding parts of the two ends of the second winding segment 340, they can be directly in contact or spaced apart in space; similarly, the "node" structure corresponding to the first winding segment 320 described in the following text is also explained in the same way, which will not be repeated here.

[0055] Exemplarily, the two ends of the first winding section 320 cross and extend, and the two ends of the first winding section 320 "intersect" in space to form a "node" structure. The two ends of the first winding section 320 are not directly connected. This type of "node" structure enables the belly net 300 to distribute stress more evenly when subjected to force, thereby improving the overall mechanical properties. At the same time, this type of "node" structure is conducive to increasing the effective cross-sectional area of ​​the first winding section 320. The increase in cross-sectional area enables the belly net 300 to withstand greater external forces, thereby improving its bearing capacity and durability. The cross-extension can also make the arrangement of the second winding section 340 more flexible, thereby improving the space utilization efficiency; or, the two ends of the first winding section 320 cross and extend, and the two ends of the second winding section 340 directly form the connection points of the solid structure, which can more effectively resist the impact and extrusion of external forces, thereby improving the overall strength of the belly net 300, and the manufacture of the solid structure can be simpler and more direct. The solid structure also reduces the potential failure points caused by node problems, thereby improving the reliability of the belly net 300.

[0056] Compared with some technologies, the ring gear is connected to the hub through a web to form a face gear. In order to improve the structural strength of the face gear, the web is usually set to a solid structure or an open hole structure, which makes the overall weight of the face gear larger. According to the face gear 1000 of the embodiment of the present invention, the ring gear 200 is connected to the hub 100 through the web 300 to form the face gear 1000. The web 300 can effectively reduce the overall weight of the face gear 1000 and ensure the structural strength of the face gear 1000. At the same time, at least one of the first winding section 320 and the second winding section 340 in the web 300 has two ends that cross-extend, which is conducive to improving the space utilization efficiency and the structural reliability of the web 300. The arrangement of the web 300 is not easily restricted, and is suitable for design scenarios with compact layout and slightly complex structure of the web 300.

[0057] It can be understood that in the embodiment of the present invention, the number of turns of the first winding section 320 around the first winding structure 120 can be less than one turn, equal to one turn, or greater than one turn. Similarly, the number of turns of the second winding section 340 around the second sleeve structure 240 can be less than one turn, equal to one turn, or greater than one turn.

[0058] like Figure 1, Figure 8 , Fig.11 and Fig.14 As shown, in some embodiments, the outer peripheral walls of the plurality of first winding structures 120 corresponding to the web 300 are all inscribed in the preset cylindrical surface R, and the two ends of the second winding section 340 extend along directions tangent to the preset cylindrical surface R respectively.

[0059] For example, when power is transmitted from the ring gear 200 to the hub 100 through the belly mesh 300, the second winding structure 240 drives the corresponding first winding structure 120 to move through the corresponding second winding section 340 and the first winding section 320, and the two ends of the second winding section 340 extend toward the first winding section 320 along a direction tangent to the preset cylinder R. Then, the angle between the extension direction of the two end parts of the second winding section 340 and the direction in which the corresponding first winding section 320 is driven to move is small, and based on tending to 0°, it is convenient to make the two end parts of the second winding section 340 theoretically only subjected to tension, which is the most ideal stress state, which is conducive to giving full play to the mechanical performance advantages of the belly mesh 300, thereby improving the overall strength and durability of the face gear 1000.

[0060] Similarly, when power is transmitted from the wheel hub 100 to the gear ring 200 through the belly mesh 300, the first winding structure 120 drives the corresponding second winding structure 240 to move through the corresponding first winding section 320 and the second winding section 340, and the two ends of the second winding section 340 extend toward the first winding section 320 in a direction tangent to the preset cylinder R. Then, the angle between the extension direction of the two end parts of the second winding section 340 and the movement direction of the corresponding first winding section 320 is small, basically tending to 0°, so that the two end parts of the second winding section 340 are theoretically only subjected to tension, which is the most ideal stress state, which is conducive to giving full play to the mechanical performance advantages of the belly mesh 300, thereby improving the overall strength and durability of the face gear 1000.

[0061] like Figure 1 , Figure 2 , Fig.11 and Fig.13As shown, in some embodiments, the second winding section 340 includes a first portion 342 and two second portions 344, the first portion 342 is located on the radial outer side of the second winding structure 240, and can withstand a larger radial force or bending moment, the two second portions 344 are respectively connected to the two ends of the first portion 342 and the two second portions 344 are respectively located on the circumferential sides of the second winding structure 240, and can more effectively resist the circumferential torque or shear force; on the cross section of the face gear 1000, the orthographic projections of the two second portions 344 connected to the first winding section 320 are located on the same straight line The two second parts 344 are respectively subordinate to two second winding sections 340 connected to and adjacent to the first winding section 320. Therefore, no matter whether the rotation direction of the face gear 1000 is clockwise or counterclockwise, the angle between the extension direction of the second part 344 and the movement direction of the corresponding first winding section 320 or the driven movement direction is small, basically tending to 0°, so that the second part 344 is theoretically only subjected to tension, which is the most ideal stress state, giving full play to the mechanical performance advantages of the belly mesh 300, so that the stress of the face gear 1000 can be more evenly distributed when subjected to stress.

[0062] In some embodiments, the wheel hub 100 and the gear ring 200 are metal parts. For example, when the web 300 is a continuous fiber composite material, the face gear 1000 can be a composite gear of a continuous fiber reinforced composite material-metal material; two or more composite material or metal material structural elements are connected and designed for use, and the connection parts are able to withstand and transmit specific loads, and the composite material structural elements and metal material structural elements are physically connected to form a functional whole structure is called a hybrid structure.

[0063] Metal is a high-strength material that can withstand large mechanical stresses and loads. Therefore, the wheel hub 100 and the gear ring 200 made of metal usually have excellent load-bearing capacity and durability, and can be applied to various heavy-load and high-speed applications. At the same time, the fatigue strength of metal is high, which is conducive to reducing the risk of fatigue damage of the wheel hub 100 and the gear ring 200, thereby improving the structural stability of the face gear 1000. In other words, the advantages of metal materials are good machining performance, high machining accuracy, balanced mechanical properties, and high contact strength, but their main disadvantages are high density and high weight; while composite materials, especially continuous carbon fiber reinforced composite materials, have advantages of low density, high specific strength, high specific modulus, and strong designability, but their main disadvantages are poor machining performance, poor machining accuracy, and low contact strength. The hybrid face gear 1000 of the embodiment of the present invention can optimize material selection and structural design according to different material properties, so as to achieve high performance, light weight, and low cost.

[0064] like Figure 11-Figure 17As shown, in some embodiments, the belly net 300 is composed of a carbon fiber rope 700 that is wound multiple times in a unidirectional cycle along a closed path until the winding thickness of the carbon fiber rope 700 reaches the mechanical strength design requirement of the face gear 1000. The carbon fiber rope 700 has excellent performance (high specific strength, high specific modulus, fatigue resistance, corrosion resistance, and excellent comprehensive performance), performance designability (active cutting and design can be performed according to the stress flow direction and stress size of the component), and material and component integrity (the material and the component are formed at the same time to improve the integrity of the component), so that the belly net 300 made of carbon fiber rope 700 performs well in withstanding tension. The use of carbon fiber rope 700 to make the belly net 300 can also effectively reduce the overall weight of the face gear 1000.

[0065] It can be seen that a continuous carbon fiber rope 700 corresponding to the belly net 300 may include the first rope segment to the nth rope segment connected in sequence, n is a positive integer and n≥2, the first rope segment is alternately wound with the first winding structure 120 and the second winding structure 240 along a closed path to form a first layer structure, the second rope segment is alternately wound with the first winding structure 120 and the second winding structure 240 along a closed path to form a second layer structure, ..., the nth rope segment is alternately wound with the first winding structure 120 and the second winding structure 240 along a closed path to form an nth layer structure, the winding path and winding direction of all rope segments are the same, then the head and tail ends of each layer structure can be matched to make the closed figures formed by the multi-layer structure the same. Among them, n can be set according to the actual needs of the face gear 1000, each layer structure is a ring structure, and the radial inner end of each layer structure is connected to multiple first winding structures 120, and the radial outer end of each layer structure is connected to multiple second winding structures 240.

[0066] It can be understood that the first winding section 320 may include a portion of a multi-layer structure wound around the first winding structure 120 , and the second winding section 340 may include a portion of a multi-layer structure wound around the second winding structure 240 .

[0067] For example, the belly net 300 of the face gear 1000 is formed by weaving a continuous carbon fiber rope 700 through a three-dimensional space and unidirectionally looping multiple times along a closed path, and the winding path is specifically as follows:

[0068] A01-A02-A03-A04-B01-B02-B03-B04-C01-C02-C03-C04-D01-D02-D03-D04-E01-E02-E03-E04-F01-F02-F03-F04-G01 -G02-G03-G04-H01-H02-H03-H04-I01-I02-I03-I04-J01-J02-J03-J04-K01-K02-K03-K04-L01-L02-L03-L04-M01-M0 2-M03-M04-N01-N02-N03-N04-O01-O02-O03-O04-P01-P02-P03-P04-Q01-Q02-Q03-Q04-A01-A02-A03-A04…, cycle in sequence until the winding thickness of the carbon fiber rope 700 reaches the mechanical strength design requirement. The carbon fiber rope 700 is theoretically only subjected to tension, which is the most ideal stress state of the continuous fiber reinforced composite material, giving full play to the mechanical performance advantages of the continuous fiber reinforced composite material, thereby enhancing the stability of the face gear 1000. Among them, the image corresponding to the closed path can be:

[0069] A01-A02-A03-A04-B01-B02-B03-B04-C01-C02-C03-C04-D01-D02-D03-D04-E01- E02-E03-E04-F01-F02-F03-F04-G01-G02-G03-G04-H01-H02-H03-H04-I01-I02- I03-I04-J01-J02-J03-J04-K01-K02-K03-K04-L01-L02-L03-L04-M01-M02-M03- M04-N01-N02-N03-N04-O01-O02-O03-O04-P01-P02-P03-P04-Q01-Q02-Q03-Q04.

[0070] The carbon fiber rope 700 is a rope made of continuous carbon fiber, referred to as carbon rope; for example, based on the carbon fiber preparation process, in the carbon fiber industry, the number of carbon fibers per bundle is between 1,000 and 12,000, which is called small-tow carbon fiber, and the number of carbon fibers per bundle is greater than 48,000 (referred to as 48K) is called large-tow carbon fiber. Using appropriate process flow, carbon fiber bundles of appropriate specifications are prepared into structural elements with specific functions, which are usually called continuous carbon fiber ropes.

[0071] like Figure 1 , Fig.16 and Fig.17As shown, the carbon fiber rope 700 is formed by a plurality of fiber filaments 710. The type of the carbon fiber rope 700 may be a parallel fiber bundle rope, a twisted fiber bundle rope, a braided fiber bundle rope, etc., and its cross section may be circular, elliptical, rectangular, polygonal, or irregular. In some embodiments, the carbon fiber rope 700 may be a parallel fiber bundle rope, which may be used in either manual winding or mechanical automatic winding conditions. After the carbon fiber rope 700 is wound, the face gear 1000 may be placed as a whole in an autoclave and cured according to the curing process requirements of the carbon fiber and the resin to further improve the structural stability of the face gear 1000.

[0072] Of course, it is understandable that the specific type of the carbon fiber rope 700 can be determined according to actual production requirements and is not specifically limited here.

[0073] like Figure 1 As shown, in some embodiments, the web 300 is multiple and the multiple webs 300 include a first web 360 and a second web 380. The multiple first winding structures 120 corresponding to the first web 360 constitute a first group 362, and the multiple first winding structures 120 corresponding to the second web 380 constitute a second group 382. The first group 362 and the second group 382 are arranged at intervals along the axial direction, and the two are arranged at intervals on both sides of the axial direction of the ring gear 200. The first web 360 and the second web 380 can increase the strength and stability of the face gear 1000. The webs 300 are connected to the ring gear 200 through the corresponding winding structures to form a more stable whole.

[0074] The first group 362 and the second group 382 are respectively arranged at intervals on both axial sides of the gear ring 200 , which helps the web 300 to disperse and resist forces and torques from different directions, thereby improving the load-bearing capacity of the face gear 1000 .

[0075] It can be understood that by arranging the first group 362 and the second group 382 on the axial sides of the hub 100, the first web 360 and the second web 380 can be arranged on the axial sides of the gear ring 200, and the axial force of the first web 360 on the gear ring 200 and the axial force of the second web 380 on the gear ring 200 can be basically balanced with each other, so as to improve the stability of the connection between the gear ring 200 and the hub 100 in the axial direction; at the same time, the radial forces between the hub 100 and the gear ring 200 by the first web 360 and the second web 380 can be superimposed on each other, so as to improve the reliability of the connection between the gear ring 200 and the hub 100 in the radial direction. In addition, the number of webs 300 can be two, three, four or more than four.

[0076] In some embodiments, Figure 1 , Fig.13 and Fig.15As shown, the first web 360 and the second web 380 have the same shape, which is beneficial to achieving good consistency between the force exerted by the first web 360 on the gear ring 200 and the wheel hub 100 and the force exerted by the second web 380 on the gear ring 200 and the wheel hub 100, thereby facilitating further improving the structural stability of the face gear 1000 and making it easier to wind the first web 360 and the second web 380 in the same manner, thereby simplifying the processing of the face gear 1000.

[0077] Optionally, the first web 360 and the second web 380 are staggered in the circumferential direction. Exemplarily, on the cross section of the face gear 1000, the orthographic projection surface of the first web 360 and the orthographic projection surface of the second web 380 may have an overlapping area but do not completely overlap, or the orthographic projection surface of the first web 360 and the orthographic projection surface of the second web 380 do not have an overlapping area, which is conducive to preventing the first web 360 and the second web 380 from interfering with each other, facilitating the arrangement of the first web 360 and the second web 380 on the gear ring 200, and further improving the space utilization rate on the face gear 1000.

[0078] like Figure 1 , Fig.13 and Fig.15 As shown, in some embodiments, the first web 360 and the second web 380 have the same shape and are circumferentially staggered, so that the first web 360 and the second web 380 have a certain circumferential rotational symmetry, which can more evenly distribute the loads from all directions, help reduce local overload and stress concentration, thereby improving the stability and durability of the entire structure. At the same time, since the first web 360 and the second web 380 are circumferentially staggered, the space can be used more effectively.

[0079] like Figure 1 , Figure 3 and Figure 7As shown, in some embodiments, the plurality of second winding structures 240 corresponding to the first web 360 and the plurality of second winding structures 240 corresponding to the second web 380 are alternately arranged one by one along the circumferential direction, that is, in the circumferential direction of the gear ring 200, a second winding structure 240 corresponding to the second web 380 is arranged between two adjacent second winding structures 240 corresponding to the first web 360, and similarly, a second winding structure 240 corresponding to the first web 360 is arranged between two adjacent second winding structures 240 corresponding to the second web 380. It can be seen that the second winding structures 240 corresponding to the first web 360 and the second web 380 are alternately arranged to form a more stable structure, which helps to disperse and resist forces and torques from all directions, can distribute stress more evenly, and reduce the occurrence of stress concentration. When the structure is subjected to external force, the stress will be evenly distributed in the circumferential direction of the first web 360 and the circumferential direction of the second web 380, thereby extending the service life of the web 300.

[0080] In addition, the above arrangement is also beneficial to improving the force stability of the gear ring 200 , while improving the space utilization of the gear ring 200 in the circumferential direction, facilitating the processing and production of the gear ring 200 , and helping to prevent mutual interference between the first web 360 and the second web 380 .

[0081] like Figure 1-Figure 6 As shown, in some embodiments, one axial end of the gear ring 200 has gear teeth 220, and all second winding structures 240 are located at the other axial end of the gear ring 200. The gear teeth 220 are located at one end of the gear ring 200 for transmitting torque or rotational motion, and the second winding structure 240 is located at the other end for cooperating with the web 300. Such a layout makes the functions of the gear teeth 220 and the second winding structure 240 clearer, reduces the interference between the gear teeth 220 and the second winding structure 240 during the operation of the face gear 1000, and helps to improve the reliability of the face gear 1000 in operation. In addition, the web 300 is not easy to interfere with the meshing of the gear teeth 200 with other gears, so as to ensure the reliability and stability of the transmission cooperation between the face gear 1000 and other gears, and helps to prevent the web 300 from being worn by the gear teeth 220 or the above-mentioned other gears, thereby improving the service life of the web 300.

[0082] like Figure 1-Figure 6As shown, in some embodiments, the second winding structure 240 includes a first stopper 242 and a second stopper 244, the first stopper 242 protrudes from the end surface of the other axial end of the gear ring 200, the second stopper 244 is connected to the end of the first stopper 242 away from the gear ring 200, and the second stopper 244 is spaced apart from the gear ring 200, and the second stopper 244 protrudes from the radial outer end surface of the first stopper 242. It can be seen that the first stopper 242 provides a stable installation platform for the installation of the second winding section 340, so that the second winding section 340 can be closely and firmly matched with the gear ring 200. At the same time, the first stopper 242 makes the installation process more convenient and efficient. The second winding section 340 can be installed on the first stopper 242 through a simple sleeve fixing or winding action. Since the second stop portion 244 protrudes from the radial outer end surface of the first stop portion 242 , the second stop portion 244 plays a limiting role, so that the second winding section 340 will not accidentally fall out or loosen during use, thereby improving the stability and durability of the face gear 1000 .

[0083] In addition, since the second winding structure 240 entirely protrudes from the end of the ring gear 200 that is away from the gear teeth 200, there is no need to provide a groove or other structure on the ring gear 200, which will not weaken the ring gear 200, and the ring gear 200 will not occupy the space between two adjacent second winding structures 240, and will not limit the cross-sectional area of ​​the winding section of the belly net 300, thereby facilitating appropriate improvement of the structural strength of the belly net 300.

[0084] In other embodiments of the present invention, the second winding structure 240 can also be constructed as two through holes that are spaced apart and radially penetrate the ring gear 200. The second winding section 340 is passed through the through holes to form a more secure connection structure, so that the second winding section 340 will not accidentally fall out or loosen during use.

[0085] Optionally, combined Figure 7-Figure 10 The first winding structure 120 can be configured as a winding column extending in the axial direction, and the hub 100 can be provided with a winding flange extending in the radial direction, and the winding flange is used to provide a mounting position for the winding column to facilitate the processing of the first winding structure 120.

[0086] like Fig.18 and Fig.19 As shown, the transmission system 2000 according to the second aspect of the embodiment of the present invention includes an input shaft 510 and an output shaft 520. The input shaft 510 is a key component that receives external power and transmits it to the output shaft 520. The output shaft 520 is responsible for outputting power in the transmission system 2000, and the output shaft 520 transmits the power to an external device.

[0087] The transmission system 2000 further includes a driving gear 530 and a driven gear 540. The driving gear 530 is fixed to the input shaft 510, and the driving gear 530 meshes with the driven gear 540 to transmit power to the driven gear 540, and the power is transmitted to the output shaft 520 through the driven gear 540, thereby realizing the power output of the transmission system 2000, and then driving the entire transmission system 2000. Among them, the driven gear 540 is the face gear 1000 according to the embodiment of the first aspect of the present invention, and the hub 100 of the driven gear 540 is fixed to the output shaft 520, which enhances the overall structural strength of the driven gear 540 and effectively reduces the overall weight of the transmission system 2000.

[0088] Optionally, the transmission system 2000 is a reduction transmission system to reduce the rotation speed and increase the torque.

[0089] like Figure 20-23 As shown, in some embodiments, the driving gear 530 is sleeved outside the input shaft 510, the inner circumferential wall of the driving gear 530 and the outer circumferential wall of the input shaft 510 that cooperates with the driving gear 530 are both non-circular (then the cross-sectional shape of the inner circumferential wall of the driving gear 530 is non-circular, and the cross-sectional shape of the outer circumferential wall of the input shaft 510 that cooperates with the driving gear 530 is non-circular), and the two are fixed by an adhesive layer 560, the thickness of the adhesive layer 560 is t, 0.1mm≤t≤0.2mm, the non-circular matching design makes the matching between the driving gear 530 and the input shaft 510 more precise, reduces the gap caused by improper matching, thereby improving the accuracy and stability of the transmission, and is fixed by the adhesive layer 560 with a thickness of 0.1mm to 0.2mm, which can further enhance the connection strength between the driving gear 530 and the input shaft 510.

[0090] like Fig.18 and Fig.19 In some embodiments, the transmission system 2000 further includes a housing 550, which includes a first barrel portion 552 and a second barrel portion 554. The first barrel portion 552 has a receiving chamber 553, in which the driving gear 530 and the driven gear 540 are both arranged. An axial end of the second barrel portion 554 is connected to the outer peripheral wall of the first barrel portion 552, and the axial direction of the second barrel portion 554 is perpendicular to the axial direction of the first barrel portion 552. The combination of the first barrel portion 552 and the second barrel portion 554 facilitates the formation of a closed space, which is convenient for isolating the driving gear 530, the driven gear 540 and other internal mechanical components from the external environment, and can reduce the possibility of impurities such as dust and moisture entering the transmission system 2000, so that the transmission system 2000 can run more stably.

[0091] The transmission system 2000 further includes a first cover plate 556, which is covered at one axial end of the first barrel portion 552, and the output shaft 520 is passed through the first cover plate 556 and extends into the accommodating chamber 553; the transmission system 2000 further includes a second cover plate 558, which is covered at one axial end of the second barrel portion 554 away from the first barrel portion 552, and the input shaft 510 is passed through the second cover plate 558 and extends into the accommodating chamber 553. The first cover plate 556 and the second cover plate 558 are respectively covered at one axial end of the first barrel portion 552 and the second barrel portion 554, further enhancing the sealing property of the housing 550, effectively reducing the possibility of impurities entering the transmission system 2000, playing a role in protecting the internal components from external impact and damage, and facilitating the processing and molding of the various components of the transmission system 2000. For example, they can prevent foreign objects from accidentally hitting transmission components such as gears.

[0092] Among them, the shell 550, the first cover plate 556 and the second cover plate 558 are respectively composite materials, and the input shaft 510 and the output shaft 520 are respectively composite materials. For example, the shell 550, the first cover plate 556, the second cover plate 558, the input shaft 510 and the output shaft 520 can all be formed as carbon fiber material parts. Composite materials have the advantages of low density, high specific strength, high specific modulus, strong designability, etc., which can effectively reduce the overall weight of the transmission system 2000.

[0093] like Fig.23 and Fig.24 As shown, the helicopter 3000 according to the third embodiment of the present invention comprises a power system 610, a rotor system 620 and a transmission system 2000 according to the second embodiment of the present invention, wherein the transmission system 2000 is connected between the power system 610 and the rotor system 620 to transmit the power of the power system 610 to the rotor system 620. Thus, the helicopter 3000 adopts the transmission system 2000, which facilitates the performance improvement and lightweight design of the helicopter 3000.

[0094] It can be understood that the type of helicopter 3000 in the embodiment of the present invention is not limited. It can be a single-rotor helicopter or a twin-rotor helicopter. The twin-rotor helicopters include longitudinal twin-rotor helicopters, transverse twin-rotor helicopters, cross twin-rotor helicopters and coaxial twin-rotor helicopters, etc.

[0095] For example, Figure 1-Figure 17As shown, the hub 100 may be provided with thirty-four first winding structures 120, of which seventeen first winding structures 120 are arranged at intervals along the circumference of the hub 100 to form a first group 362, and the remaining seventeen first winding structures 120 are arranged at intervals along the circumference of the hub 100 to form a second group 382, ​​the first group 362 and the second group 382 are arranged at intervals along the axial direction, and are respectively located on both sides of the axial direction of the gear ring 200; the two belly nets 300 are respectively the first belly net 360 and the second belly net 380, the first belly net 360 corresponds to the first group 362, and the second web 380 corresponds to the second group 382; accordingly, the gear ring 200 is provided with thirty-four second winding structures 240 spaced apart along the circumferential direction, of which seventeen second winding structures 240 correspond to the first web 360, and the remaining seventeen second winding structures 240 correspond to the second web 380, and the seventeen second winding structures 240 corresponding to the first web 360 and the seventeen second winding structures 240 corresponding to the second web 380 are alternately arranged one by one along the circumferential direction. The first web 360 and the second web 380 have the same structure, and both adopt a carbon fiber rope 700 to alternately wind the first winding structure 120 and the second winding structure 240 in sequence along a closed path, and are wound one-way and cyclically for multiple times.

[0096] like Fig.11 , Fig.13 and Fig.16 As shown, the winding path of the carbon fiber rope 700 of the first abdominal mesh 360 can be:

[0097] "A01-A02-A03-A04-B01-B02-B03-B04-C01-C02-C03-C04-D01-D02-D03-D04-E01-E02-E 03-E04-F01-F02-F03-F04-G01-G02-G03-G04-H01-H02-H03-H04-I01-I02-I03-I04-J01- J02-J03-J04-K01-K02-K03-K04-L01-L02-L03-L04-M01-M02-M03-M04-N01-N02-N03-N04-O01-O02-O03-O04-P01-P02-P03-P04-Q01-Q02-Q03-Q04-A01-A02-A03-A04…” and so on.

[0098] like Fig.14 , Fig.15 and Fig.16 As shown, the winding path of the carbon fiber rope 700 of the second belly net 380 can be:

[0099] "a01-a02-a03-a04-b01-b02-b03-b04-c01-c02-c03-c04-d01-d02-d03-d04-e01-e02-e 03-e04-f01-f02-f03-f04-g01-g02-g03-g04-h01-h02-h03-h04-i01-i02-i03-i04-j01- j02-j03-j04-k01-k02-k03-k04-l01-l02-l03-l04-m01-m02-m03-m04-n01-n02-n03-n04-o01-o02-o03-o04-p01-p02-p03-p04-q01-q02-q03-q04-a01-a02-a03-a04…” and so on, winding in a cycle.

[0100] Thus, the carbon fiber rope 700 is alternately wound on the seventeen first winding structures 120 and the seventeen second winding structures 240 in sequence according to the above-mentioned winding method, and is wound multiple times in a unidirectional cycle to form a belly net. Compared with some technologies, the ring gear is connected to the hub through a web to form a face gear. In order to improve the structural strength of the face gear, the web is usually set to a solid structure or an open-hole structure, which makes the overall weight of the face gear larger. According to the face gear 1000 of the embodiment of the present invention, the ring gear 200 is connected to the hub 100 through two webs 300 to form the face gear 1000. The web 300 is composed of two carbon fiber ropes 700 that are wound multiple times in a one-way cycle along a closed path. The web 300 can effectively reduce the overall weight of the face gear 1000 and ensure the structural strength of the face gear 1000. At the same time, at least one of the first winding section 320 and the second winding section 340 in the web 300 has two ends that cross and extend, which is conducive to improving the space utilization efficiency and the structural reliability of the web 300. The arrangement of the web 300 is not easily restricted, which is suitable for design scenarios with compact layout and slightly complex structure of the web 300.

[0101] In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. In addition, the various different embodiments of the present invention can also be combined arbitrarily, as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

[0102] In the description of the present invention, it is necessary to understand that the terms "center", "lateral", "length", "thickness", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0103] In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0104] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0105] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A face gear, characterized in that: include: A hub, wherein the hub has a plurality of first winding structures; A gear ring, the gear ring is arranged around the outside of the wheel hub at intervals, at least one of the two axial ends of the gear ring has a plurality of gear teeth, and the gear ring has a plurality of second winding structures; The belly net is formed into an annular structure, the radial inner end of the belly net has a plurality of first winding segments arranged at intervals along the circumferential direction, and the radial outer end has a plurality of second winding segments arranged at intervals along the circumferential direction, each of the first winding segments is wound around one of the first winding structures and connected between two of the second winding segments, each of the second winding segments is wound around one of the second winding structures and connected between two of the first winding segments, and the two ends of at least one of the first winding segments and the second winding segments cross and extend.

2. The face gear according to claim 1, characterized in that: The outer peripheral walls of the plurality of first winding structures corresponding to the web are all inscribed in a preset cylindrical surface, and the two ends of the second winding section extend along directions tangent to the preset cylindrical surface respectively.

3. The face gear according to claim 1, characterized in that: The second winding section includes a first portion and two second portions, the first portion is located radially outside the second winding structure, and the two second portions are respectively connected to two ends of the first portion and are respectively located on both sides of the circumference of the second winding structure. On the cross section of the face gear, the orthographic projections of the two second portions connected by the first winding segment are located on the same straight line.

4. The face gear according to any one of claims 1 to 3, characterized in that: The abdominal net is formed by a carbon fiber rope being wound multiple times in one direction along a closed path.

5. The face gear according to claim 4, characterized in that: The belly webs are multiple and include a first belly web and a second belly web. The multiple first winding structures corresponding to the first belly web constitute a first group. The multiple first winding structures corresponding to the second belly web constitute a second group. The first group and the second group are arranged at intervals along the axial direction, and the two are respectively arranged at intervals on both sides of the axial direction of the gear ring.

6. The face gear according to claim 5, characterized in that: The first web and the second web have the same shape and are staggered in the circumferential direction. The plurality of second winding structures corresponding to the first web and the plurality of second winding structures corresponding to the second web are alternately arranged one by one in the circumferential direction.

7. The face gear according to claim 5, characterized in that: The gear teeth are provided at one axial end of the gear ring, and all the second winding structures are located at the other axial end of the gear ring.

8. The face gear according to claim 7, characterized in that: The second winding structure includes a first stop portion and a second stop portion, the first stop portion protruding from the end surface of the other axial end of the gear ring, the second stop portion being connected to the end of the first stop portion facing away from the gear ring and spaced apart from the gear ring, and the second stop portion protruding from the radial outer end surface of the first stop portion.

9. A transmission system, characterized in that: include: Input shaft and output shaft; A driving gear and a driven gear, wherein the driving gear is fixed to the input shaft and meshes with the driven gear, the driven gear is a face gear according to any one of claims 1-8, and the hub of the driven gear is fixed to the output shaft.

10. A helicopter, characterized in that: The invention comprises a power system, a rotor system and a transmission system according to claim 9, wherein the transmission system is connected between the power system and the rotor system to transmit the power of the power system to the rotor system.

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