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 mechanisms. The face gear comprises: a hub, a gear ring and a belly net, the hub has a plurality of first winding structures, the gear ring is arranged around the hub at intervals, the gear ring has a plurality of gear teeth and a plurality of second winding structures, the belly net is composed of a carbon fiber rope that is alternately wound around the first winding structure and the second winding structure in a closed path and is wound one-way for multiple times, so that the belly net is formed into an annular structure, the radial inner end of the belly net is connected to the plurality of first winding structures, and the radial outer end of the belly net is connected to the plurality of second winding structures. Therefore, by setting the belly net, it is beneficial to reduce the weight of the face gear, and at the same time it is beneficial to ensure the structural strength of the face gear, and the carbon fiber rope is mainly subjected to tension to give full play to the mechanical performance advantages of the carbon fiber rope.

Description

Technical Field

[0001] The invention relates to the technical field of transmission mechanisms, 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 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 the helicopter reducer.

[0003] In the related art, the overall weight of the face gear is relatively large and still needs to be optimized in terms of structural design. Summary of the invention

[0004] 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, which has good structural stability and can effectively reduce the weight of the face gear.

[0005] According to an embodiment of the first aspect of the present invention, the face gear comprises: a hub having a plurality of first winding structures; a gear ring, which is arranged around the outside of the hub at intervals, at least one of the two axial ends of the gear ring having a plurality of gear teeth, and the gear ring has a plurality of second winding structures; a belly net, which is composed of a carbon fiber rope that is alternately wound around the first winding structure and the second winding structure in sequence along a closed path and is wound multiple times in a unidirectional cycle so that the belly net forms an annular structure, the radial inner end of the belly net is connected to the plurality of the first winding structures, and the radial outer end of the belly net is connected to the plurality of the second winding structures.

[0006] According to the face gear of the embodiment of the present invention, by setting the belly net, it is beneficial to reduce the weight of the face gear, and at the same time it is beneficial to ensure the structural strength of the face gear. Considering that the mechanical properties of the carbon fiber rope are best along the fiber filament direction, the belly net is constructed by a carbon fiber rope along a closed path. The first winding structure and the second winding structure are alternately wound in sequence and formed by multiple unidirectional loop windings, so that the carbon fiber rope is mainly subjected to tension, which can also be understood as making the carbon fiber rope stressed along the fiber filament direction, so as to give full play to the mechanical property advantages of the carbon fiber rope, and it is beneficial to improve the processing convenience of the face gear, to ensure the uniformity of force on the belly net, the first winding structure and the second winding structure, and to improve stress concentration, thereby helping to improve the stability of the face gear in the process of transmitting power.

[0007] According to some embodiments of the present invention, the belly network includes a plurality of winding segments connected end to end in sequence, each of the winding segments includes a first segment and a second segment connected in sequence, the first segment is arranged around a first winding structure, and the second segment is arranged around a second winding structure, and on the cross-section of the face gear, the orthographic projection of each winding segment has no intersection with the orthographic projections of the remaining winding segments except the two winding segments adjacent to it.

[0008] According to some embodiments of the present invention, a plurality of the first winding structures are arranged at intervals along the circumferential direction, a plurality of the second winding structures are arranged at intervals along the circumferential direction, and a plurality of the winding sections are arranged in sequence along the circumferential direction.

[0009] According to some embodiments of the present invention, the first segment and the second segment are respectively formed into open ring shapes, the opening of the first segment faces radially outward, and the opening of the second segment faces radially inward.

[0010] According to some embodiments of the present invention, the abdominal web is multiple and includes a first abdominal web and a second abdominal web, the multiple first winding structures corresponding to the first abdominal web constitute a first group, the multiple first winding structures corresponding to the second abdominal web 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.

[0011] According to some embodiments of the present invention, 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.

[0012] According to some embodiments of the present invention, one axial end of the gear ring has the gear teeth, and all of the second winding structures are located at the other axial end of the gear ring.

[0013] According to some embodiments of the present invention, a plurality of the first winding structures corresponding to the first web and the gear teeth are located on the same axial side of the gear ring, and the gear ring is provided with grooves on the outer peripheral side of each of the second winding structures, the radial outer sides of the grooves are open, and the grooves include a first groove segment, a second groove segment and a third groove segment, the first groove segment extends circumferentially, the second groove segment and the third groove segment are respectively connected to the circumferential ends of the first groove segment, and both extend radially to the inner circumferential wall passing through the gear ring, the side of the first groove segment corresponding to the first web facing away from the gear teeth is open, and the second winding structure corresponding to the second web extends to the side of the corresponding first groove segment facing away from the gear teeth.

[0014] A second aspect of the present invention aims to provide a transmission system.

[0015] A transmission system comprises: an input shaft and an output shaft; a driving gear and a driven gear, wherein the driving gear is fixedly arranged on the input shaft and meshes with the driven gear, the driven gear is the above-mentioned face gear, and the hub of the driven gear is fixedly arranged on the output shaft.

[0016] The transmission system has the same advantages as the above-mentioned face gear, which will not be elaborated here.

[0017] A third aspect of the present invention aims to provide a helicopter.

[0018] A helicopter comprises a power system, a rotor system and the above-mentioned transmission system, 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.

[0019] The advantages of the helicopter are the same as those of the transmission system described above, which will not be described in detail here.

[0020] 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

[0021] 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:

[0022] Figure 1 It is a structural schematic diagram of the face gear according to an embodiment of the present invention;

[0023] Figure 2 The structure of the first abdominal mesh according to the embodiment of the present invention is shown in FIG. Figure 1 ;

[0024] Figure 3 The structure of the first abdominal mesh according to the embodiment of the present invention is shown in FIG. Figure 2 ;

[0025] Figure 4 The structure of the second abdominal mesh according to the embodiment of the present invention is shown in FIG. Figure 1 ;

[0026] Figure 5 The structure of the second abdominal mesh according to the embodiment of the present invention is shown in FIG. Figure 2 ;

[0027] Figure 6 This is a schematic diagram of the structure of a carbon fiber rope according to an embodiment of the present invention;

[0028] Figure 7 for Figure 6 The enlarged view of O in the middle;

[0029] Figure 8 The structure of the wheel hub according to the embodiment of the present invention is shown in FIG. Figure 1 ;

[0030] Fig. 9 The structure of the wheel hub according to the embodiment of the present invention is shown in FIG. Figure 2 ;

[0031] Fig.10 for Fig. 9 Sectional view at QQ;

[0032] Fig.11 for Fig. 9 Sectional view at RR;

[0033] Fig.12 The structure of the gear ring according to the embodiment of the present invention is shown in FIG. Figure 1 ;

[0034] Fig.13 The structure of the gear ring according to the embodiment of the present invention is shown in FIG. Figure 2 ;

[0035] Fig.14 The structure of the gear ring according to the embodiment of the present invention is shown in FIG. Figure 3 ;

[0036] Fig.15 for Fig.14 Cross-sectional view at PP;

[0037] Fig.16 It is a structural schematic diagram of a transmission system according to an embodiment of the present invention;

[0038] Fig.17 It is a structural schematic diagram of a helicopter according to an embodiment of the present invention;

[0039] Fig.18 It is a schematic diagram of the coordination of the transmission system, the power system and the rotor system according to an embodiment of the present invention;

[0040] Fig.19 It is a schematic structural diagram of the abdominal net described in another embodiment of the present invention.

[0041] Reference numerals:

[0042] Face gear 100, first group 101, second group 102, hub 110, first winding structure 111, winding flange 112, gear ring 120, gear teeth 121, second winding structure 122, groove 123, first groove section 1231, second groove section 1232, third groove section 1233, belly net 130, carbon fiber rope 1301, fiber filament 13011, winding section 131, first section 1311, second section 1312, first belly net 132, second belly net 133, transmission system 200, input shaft 210, output shaft 220, driving gear 230, housing 240, first barrel portion 241, accommodating cavity 2411, second barrel portion 242, first cover plate 250, second cover plate 260, helicopter 1000, power system 300, rotor system 400. DETAILED DESCRIPTION

[0043] 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.

[0044] In the description of the present invention, it should be understood that the terms "center", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the 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. In addition, 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, "plurality" means two or more.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, 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 communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] Reference below Figure 1-Figure 15 as well as Fig.19 A face gear 100 according to an embodiment of a first aspect of the present invention will be described.

[0047] Reference Figure 1According to an embodiment of the present invention, the face gear 100 includes: a hub 110, a ring gear 120 and a belly net 130, the hub 110 has a plurality of first winding structures 111, the ring gear 120 is arranged around the hub 110 at intervals, at least one of the two axial ends of the ring gear 120 has a plurality of gear teeth 121, and the ring gear 120 has a plurality of second winding structures 122, the belly net 130 is composed of a carbon fiber rope 1301 that is alternately wound along a closed path with the first winding structure 111 and the second winding structure 122, and is wound multiple times in a unidirectional cycle, so that the belly net 130 forms an annular structure, the radial inner end of the belly net 130 is connected to the plurality of first winding structures 111, and the radial outer end of the belly net 130 is connected to the plurality of second winding structures 122.

[0048] The ring gear 120 is arranged around the hub 110 along the circumferential direction of the hub 110, and the ring gear 120 and the hub 110 are spaced apart in the radial direction. The first winding structure 111 set on the hub 110 and the second winding structure 122 set on the ring gear 120 are both used to wind the belly net 130, so that the belly net 130 can connect the ring gear 120 with the hub 110. Power can be transmitted between the hub 110 and the ring gear 120 through the belly net 130. By setting the belly net 130, it is beneficial to reduce the overall weight of the face gear 100.

[0049] Combination Figures 2 to 5 The belly net 130 is composed of a carbon fiber rope 1301 and is formed into a mesh structure. The carbon fiber rope 1301 has excellent properties such as high specific strength, high specific modulus, fatigue resistance, and corrosion resistance, which is beneficial to improving the structural strength and comprehensive performance of the face gear 100. A carbon fiber rope 1301 is alternately wound around the first winding structure 111 and the second winding structure 122 along a closed path and is wound multiple times in a unidirectional cycle to weave the belly net 130.

[0050] It can be seen that a continuous carbon fiber rope 1301 corresponding to the belly net 130 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 111 and the second winding structure 122 along a closed path to form a first layer structure, the second rope segment is alternately wound with the first winding structure 111 and the second winding structure 122 along a closed path to form a second layer structure, ..., the nth rope segment is alternately wound with the first winding structure 111 and the second winding structure 122 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 100, and the relevant mechanical properties of the face gear 100 must be met, each layer structure is a ring structure, and the radial inner end of each layer structure is connected to multiple first winding structures 111, and the radial outer end of each layer structure is connected to multiple second winding structures 122.

[0051] For example, the belly net 130 includes an n-layer structure formed by winding a carbon fiber rope 1301 between the first winding structure 111 and the second winding structure 122 for multiple times. For example, the winding path of the carbon fiber rope 1301 can be along Figure 3 middle:

[0052] "A01-A02-A03-A04-A05-A06-A07-A08-A09-A10-A11-A12-A13-A14-A15-A16-A17-A18-A19-A20-A21-A22-A23-A24-A01..." It loops and entangles in sequence.

[0053] Or the winding path of the carbon fiber rope 1301 can also be along Figure 5 middle:

[0054] "a01-a02-a03-a04-a05-a06-a07-a08-a09-a10-a11-a12-a13-a14-a15-a16-a17-a18-a19-a20-a21-a22-a23-a24-a01..." It loops and entangles in sequence.

[0055] When the structural strength of the belly net 130 reaches the use requirements, the winding of the carbon fiber rope 1301 is stopped. In the three-dimensional space, the graph corresponding to the winding path of each layer of the carbon fiber rope 1301 is a closed graph, which can correspond to:

[0056] A01-A02-A03-A04-A05-A06-A07-A08-A09-A10-A11-A12-A13-A14-A15-A16-A17-A18-A19-A20-A21-A22-A23-A24. Or corresponding to:

[0057] a01-a02-a03-a04-a05-a06-a07-a08-a09-a10-a11-a12-a13-a14-a15-a16-a17-a18-a19-a20-a21-a22-a23-a24.

[0058] Then, each layer of carbon fiber rope 1301 is alternately wound around the first winding structure 111 and the second winding structure 122 in sequence during the winding process, so that each layer of carbon fiber rope 1301 is wound around all the first winding structures 111 and all the second winding structures 122 during the winding process, the number of first winding structures 111 and second winding structures 122 corresponding to the belly net 130 is equal, and the winding paths of the multiple layers of carbon fiber rope 1301 are the same, so as to facilitate the winding of the carbon fiber rope 1301, and the multiple layers of carbon fiber rope 1301 are constructed into a continuously arranged carbon fiber rope 1301.

[0059] Therefore, the above-mentioned setting of the belly net 130 is conducive to improving the processing convenience of the face gear 100, and by making the carbon fiber rope 1301 alternately wound on the first winding structure 111 and the second winding structure 122 in sequence, it is conducive to ensuring the force uniformity of the first winding structure 111 and the second winding structure 122, which is conducive to improving stress concentration, thereby helping to improve the stability of the face gear 100 in the process of transmitting power.

[0060] During the operation of the face gear 100, especially in an environment with high speed, heavy load or high stability requirements, the ring gear 120 will be subjected to large stress and torque. The belly net 130 can effectively disperse these stresses and prevent the ring gear 120 from being deformed or broken due to stress concentration. At the same time, the belly net 130 also enhances the overall rigidity of the face gear 100 and improves the stability and reliability of the face gear 100 during the transmission process.

[0061] In the related art, the ring gear is connected to the hub via a web. 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, resulting in a large overall weight of the face gear. The present application sets a belly net 130, which is beneficial to reducing the weight of the face gear 100 both in terms of the structure and the material of the belly net 130, and is beneficial to ensuring the structural strength of the face gear 100. Considering that the mechanical properties of the carbon fiber rope 1301 along the direction of the fiber filament 13011 are the best, the belly net 130 is constructed by alternately winding the first winding structure 111 and the second winding structure 122 along a closed path in a unidirectional cycle for multiple times, so that the carbon fiber rope 1301 is mainly subjected to tension during the power transmission process of the face gear 100, which can also be understood as making the carbon fiber rope 1301 subjected to force along the direction of the fiber filament 13011, so as to give full play to the mechanical property advantages of the carbon fiber rope 1301, and is beneficial to improving the processing convenience of the face gear 100, ensuring the uniformity of force on the belly net 130, the first winding structure 111 and the second winding structure 122, improving stress concentration, and thus ensuring that the face gear 100 can remain stable during the power transmission process.

[0062] Among them, the carbon fiber rope 1301 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.

[0063] Combination Figure 6 and Figure 7 The carbon fiber rope 1301 is formed by multiple fiber filaments 13011. The type of the carbon fiber rope 1301 can be a parallel fiber bundle rope, a twisted fiber bundle rope, a braided fiber bundle rope, etc., and its cross-section can be circular, elliptical, rectangular, polygonal and irregular. In some embodiments, the carbon fiber rope 1301 can be a parallel fiber bundle rope, which can be used in manual winding or mechanical automatic winding conditions. After the carbon fiber rope 1301 is wound, the face gear 100 can be placed in an autoclave as a whole 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 100.

[0064] Obviously, the belly mesh 130 has excellent high specific strength, high specific modulus, fatigue resistance, corrosion resistance, comprehensive performance, etc., and has good designability (it can be actively cut and designed according to the stress flow direction and stress size of the component), and its material and structural component are integrated (the material and the structural component are formed at the same time to improve the integrity of the component).

[0065] Of course, it is understandable that the specific type of the carbon fiber rope 1301 can be determined according to actual production requirements and is not specifically limited here. It is understandable that in the embodiment of the present application, the number of turns of the belly net 130 around the first winding structure 111 can be less than one turn, equal to one turn, or greater than one turn. Similarly, the number of turns of the belly net 130 around the second winding structure 122 can be less than one turn, equal to one turn, or greater than one turn.

[0066] Combination Figures 2 to 5In some embodiments, the belly net 130 includes a plurality of winding segments 131 connected end to end in sequence, each winding segment 131 includes a first segment 1311 and a second segment 1312 connected in sequence, the first segment 1311 is arranged around a first winding structure 111, and the second segment 1312 is arranged around a second winding structure 122. For two adjacent winding segments 131, the first segment 1311 of one winding segment 131 is connected to the second segment 1312 of the other winding segment 131, so that the plurality of first segments 1311 and the plurality of second segments 1312 in the belly net 130 are alternately arranged one by one along the winding direction of the carbon fiber rope 1301, so that the carbon fiber rope 1301 is alternately wound around the first winding structure 111 and the second winding structure 122 in sequence.

[0067] Among them, combined Figures 2 to 5 , on the cross section of the face gear 100, the orthographic projection of each winding segment 131 has no intersection with the orthographic projections of the remaining winding segments 131 except the two winding segments 131 adjacent to it, then the orthographic projections of the two non-adjacent winding segments 131 on the cross section of the face gear 100 have no intersection, at least one other winding segment 131 is connected between the two non-adjacent winding segments 131, and the intersection of the orthographic projections of the two adjacent winding segments 131 on the cross section of the face gear 100 can be located at the connection position of the two adjacent winding segments 131, then on the cross section of the face gear 100, the orthographic projection of the closed path corresponding to the web 130 at each intersection position has only two projection segments with the intersection as the endpoints intersecting, and there is no intersection formed by three, four or more projection segments with the intersection as the endpoints, for example, the above-mentioned orthographic projection does not exist in T-shape, cross-shape, etc.; the cross section of the face gear 100 is perpendicular to the axial direction of the face gear 100.

[0068] Therefore, on the cross section of the face gear 100, the orthographic projections of any two non-adjacent winding segments 131 do not intersect with each other, and the two winding segments 131 are not likely to contact each other in space, which is beneficial to improving the friction caused by contact between different winding segments 131 at the intersection, and is beneficial to reducing the risk of wear of the belly mesh 130, thereby helping to increase the service life of the face gear 100.

[0069] Exemplarily, in the axial direction of the face gear 100, the positive projection of each winding segment 131 extends along the radial direction of the face gear 100, and the first segment 1311 is arranged close to the central axis of the hub 110 relative to the second segment 1312, so that the first segment 1311 and the second segment 1312 are respectively wound on the first winding structure 111 and the second winding structure 122, thereby realizing that the radial inner end of the belly mesh 130 is connected to multiple first winding structures 111, and the radial outer end of the belly mesh 130 is connected to multiple second winding structures 122.

[0070] Combination Figure 1 , Figure 8 , Fig. 9 , Fig.12 and Fig.13 In some embodiments, a plurality of first winding structures 111 are arranged at intervals along the circumferential direction, a plurality of second winding structures 122 are arranged at intervals along the circumferential direction, and a plurality of winding segments 131 are arranged in sequence along the circumferential direction. Exemplarily, a plurality of first winding structures 111 are arranged at intervals along the circumferential direction of the hub 110, a plurality of second winding structures 122 are arranged at intervals along the circumferential direction of the gear ring 120, and both ends of each winding segment 131 in the radial direction are respectively wound on the first winding structure 111 and the second winding structure 122 corresponding thereto, so that the web 130 can be dispersed and spread along the circumferential direction, which is conducive to reducing the force difference at various locations of the web 130, thereby ensuring that the force acting on the web 130 can be evenly transmitted, and further conducive to improving the uniformity of the force on the face gear 100, so as to better exert the mechanical properties at various positions of the web 130.

[0071] Optionally, combined Figures 8 to 11 The first winding structure 111 can be configured as a winding column extending in the axial direction, and the hub 110 can be provided with a winding flange 112 extending in the radial direction, and the winding flange 112 is used to provide a mounting position for the winding column to facilitate the processing of the first winding structure 111.

[0072] Combination Figures 2 to 5 In some embodiments of the present invention, the first section 1311 and the second section 1312 are respectively formed into open rings, the opening of the first section 1311 is radially outward, and the opening of the second section 1312 is radially inward. At this time, the closed pattern corresponding to the web 130 can be reciprocally bent and extended along the circumference of the face gear 100 and in the radial direction of the face gear 100, so as to facilitate the winding and forming of the web 130.

[0073] It can be seen that the winding section 131 extends in a bent manner. For example, the winding section 131 can extend in a serpentine shape, and by making the opening of the first section 1311 radially outward, the first section 1311 can be wound around the first winding structure 111 located on the radial inner side of the face gear 100, and by making the opening of the second section 1312 radially inward, the second section 1312 can be wound around the second winding structure 122 located on the radial outer side of the face gear 100. At the same time, it is beneficial to ensure that the force of the belly net 130 is balanced, thereby helping to reduce the risk of damage to the belly net 130.

[0074] Optionally, when the opening of the first section 1311 is radially outward and the opening of the second section 1312 is radially inward, the first winding structure 111 and the second winding structure 122 corresponding to the same winding section 131 can be staggered along the circumference of the face gear 100 so that the winding section 131 can be better spread out in the circumferential direction of the face gear 100, which is beneficial to reducing the angle between the portion of the winding section 131 located between the first section 1311 and the second section 1312 and the radial direction of the face gear 100, and is conducive to appropriately reducing the length of the carbon fiber rope 1301, saving material and reducing costs while achieving reliable setting of the belly net 130.

[0075] Of course, the configuration of the abdominal net 130 in the embodiment of the present application is not limited thereto; for example, Fig.19 As shown, the radial inner end of the belly net 130 has a plurality of first segments 1311 spaced apart along the circumferential direction and the radial outer end has a plurality of second segments 1312 spaced apart along the circumferential direction, each first segment 1311 is wound around a first winding structure 111 and connected between two second segments 1312, each second segment 1312 is wound around a second winding structure 122 and connected between two first segments 1311, and both ends of at least one of the first segment 1311 and the second segment 1312 are cross-arranged.

[0076] Among them, the two ends of at least one of the first section 1311 and the second section 1312 are cross-extended, which is beneficial to further increase the overall rigidity and stability of the face gear 100, 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 section 1311 and the second section 1312 can be more flexibly arranged in a limited space, so as to make full use of the space between the hub 110 and the ring gear 120, which is beneficial to improve the space utilization efficiency. At the same time, the cross-sectional area of ​​each section of the belly net 130 (such as the first section 1311 and the second section 1312) can be increased, thereby improving the structural reliability of the belly net 130. Moreover, the arrangement of the belly net 130 is not easily restricted, which is particularly suitable for compact design scenarios with slightly complex structures of the belly net 130.

[0077] It can be understood that in the description of the embodiments of the present application, 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, which can represent: A exists alone, A and B exist at the same time, and B exists alone. The embodiments of the present application include the following multiple schemes: First, the two ends of the first section 1311 cross and extend; second, the two ends of the second section 1312 cross and extend; third, the two ends of the first section 1311 and the second section 1312 cross and extend. The cross-extended winding sections 131 (at least one of the first section 1311 and the second section 1312) can achieve a more flexible layout in a limited space, and the user can flexibly adjust the setting method of the first section 1311 and the second section 1312 according to the specific needs of the actual application scenario.

[0078] In some other embodiments, Fig.19 As shown, the two ends of the second section 1312 cross and extend, and the two ends of the second section 1312 "intersect" in space to form a "node" structure. The two ends of the second section 1312 are not directly connected. This type of "node" structure enables the belly net 130 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 section 1312. The increase in the cross-sectional area enables the belly net 130 to withstand greater external forces, thereby improving its bearing capacity and durability. The cross-extension can also make the arrangement of the second section 1312 more flexible, thereby improving the space utilization efficiency; or, the two ends of the second section 1312 cross and extend, and the two ends of the second section 1312 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 130, and the manufacturing 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 130.

[0079] It should be noted that, in the embodiment of the present application, the existence of the "node" structure means that the extension directions of the two ends of the second section 1312 are not parallel, and the two ends of the second section 1312 "intersect" in space, which means that the orthographic projections of the corresponding parts of the two ends of the second section 1312 on the cross section of the face gear 100 have an intersection. As for the corresponding parts of the two ends of the second section 1312, they can be directly in contact or spaced apart in space; similarly, the "node" structure corresponding to the first section 1311 described later is also explained in the same way and will not be repeated here.

[0080] For example, Fig.19As shown, the two ends of the first section 1311 cross and extend, and the two ends of the first section 1311 "intersect" in space to form a "node" structure. The two ends of the first section 1311 are not directly connected. This type of "node" structure enables the belly net 130 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 section 1311. The increase in the cross-sectional area enables the belly net 130 to withstand greater external forces, thereby improving its bearing capacity and durability. The cross-extension can also make the arrangement of the second section 1312 more flexible, thereby improving the space utilization efficiency; or, the two ends of the first section 1311 cross and extend, and the two ends of the second section 1312 directly form the connection points of the solid structure, thereby being able to more effectively resist the impact and extrusion of external forces, thereby improving the overall strength of the belly net 130, 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 130.

[0081] In some embodiments, the wheel hub 110 and the gear ring 120 are metal parts. Therefore, the face gear 100 can be a composite gear of 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 can bear 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.

[0082] Metal is a high-strength material that can withstand large mechanical stresses and loads. Therefore, the wheel hub 110 and the gear ring 120 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 110 and the gear ring 120, thereby improving the structural stability of the face gear 100. In other words, the advantages of metal materials are good machining performance, high machining precision, balanced mechanical properties, and high contact strength, but their shortcomings are mainly high density and heavy weight; while composite materials, especially continuous carbon fiber reinforced composite materials, have the advantages of low density, high specific strength, high specific modulus, and strong designability, but their shortcomings are mainly poor machining performance, poor machining precision, and low contact strength. The hybrid face gear 100 of the embodiment of the present application can optimize material selection and structural design according to different material properties, so as to achieve high performance, light weight, and low cost.

[0083] Combination Figures 1 to 5 as well as Figure 8In some embodiments of the present invention, there are multiple belly nets 130 and the multiple belly nets 130 include a first belly net 132 and a second belly net 133. The multiple first winding structures 111 corresponding to the first belly net 132 constitute a first group 101, and the multiple first winding structures 111 corresponding to the second belly net 133 constitute a second group 102. The first group 101 and the second group 102 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 ring gear 120.

[0084] By respectively arranging the first group 101 and the second group 102 on both axial sides of the hub 110, the first web 132 and the second web 133 can be respectively arranged on both axial sides of the ring gear 120, and the axial force of the first web 132 acting on the ring gear 120 and the axial force of the second web 133 acting on the ring gear 120 can be basically balanced with each other, so as to help improve the stability of the connection between the ring gear 120 and the hub 110 in the axial direction; at the same time, the radial forces of the first web 132 and the second web 133 acting between the hub 110 and the ring gear 120 can be superimposed on each other, so as to help improve the reliability of the connection between the ring gear 120 and the hub 110 in the radial direction. Therefore, by respectively arranging the first web 132 and the second web 133 on both axial sides of the ring gear 120, it is helpful to improve the structural stability of the face gear 100. It can be understood that the number of the webs 130 can be two, three, four or more than four.

[0085] Combination Figures 1 to 5 In some embodiments of the present invention, the first web 132 and the second web 133 have the same shape, which is beneficial to achieve good consistency between the force exerted by the first web 132 on the gear ring 120 and the wheel hub 110 and the force exerted by the second web 133 on the gear ring 120 and the wheel hub 110, thereby further improving the structural stability of the face gear 100, and at the same time making it easy to make the winding methods of the first web 132 and the second web 133 the same, which is beneficial to simplify the processing of the face gear 100.

[0086] Further integration Figures 1 to 5 The first web 132 and the second web 133 are staggered in the circumferential direction.

[0087] Exemplarily, on the cross section of the face gear 100, the orthographic projection surface of the first web 132 and the orthographic projection surface of the second web 133 may have an overlapping area but do not completely coincide, or the orthographic projection surface of the first web 132 and the orthographic projection surface of the second web 133 do not have an overlapping area, which is beneficial to prevent the first web 132 and the second web 133 from interfering with each other, facilitates the arrangement of the first web 132 and the second web 133 on the ring gear 120, and is beneficial to improving the space utilization on the face gear 100; and the first web 132 and the second web 133 have a certain circumferential rotational symmetry, which can more evenly distribute the loads from all directions, help to reduce local overload and stress concentration, thereby improving the stability and durability of the entire face gear 100 structure, and at the same time, because the first web 132 and the second web 133 are staggered along the circumferential direction, the space can be used more effectively.

[0088] It can be understood that when the first web 132 and the second web 133 have the same shape and are circumferentially staggered, the multiple first winding structures 111 corresponding to the first web 132 and the multiple first winding structures 111 corresponding to the second web 133 are circumferentially staggered in the wheel hub 110, and the multiple second winding structures 122 corresponding to the first web 132 and the multiple second winding structures 122 corresponding to the second web 133 are circumferentially staggered in the gear ring 120.

[0089] Of course, it is understandable that the specific arrangement of the first web 132 and the second web 133 can be determined according to actual production requirements, and is not specifically limited here, as long as the structural stability of the face gear 100 is ensured.

[0090] Combination Figure 1 , Fig.12 and Fig.13 In some embodiments of the present invention, the plurality of second winding structures 122 corresponding to the first web 132 and the plurality of second winding structures 122 corresponding to the second web 133 are alternately arranged one by one along the circumferential direction.

[0091] That is to say, in the circumferential direction of the gear ring 120, a second winding structure 122 corresponding to a second web 133 is arranged between two adjacent second winding structures 122 corresponding to the first web 132, and similarly, a second winding structure 122 corresponding to the first web 132 is arranged between two adjacent second winding structures 122 corresponding to the second web 133, so as to realize the staggered arrangement of the first web 132 and the second web 133 in the circumferential direction, which is beneficial to improve the force stability of the gear ring 120, and at the same time can improve the gear ring 120 in the circumferential direction. The space utilization rate is improved, which is convenient for the processing and production of the gear ring 120, and is also beneficial to prevent the mutual interference between the first web 132 and the second web 133; moreover, the above-mentioned arrangement can make the first web 132 and the second web 133 form a more stable structure, which is helpful to disperse and resist the forces and torques from all directions, and can distribute the stress more evenly and reduce the occurrence of stress concentration. When the structure is subjected to external force, the stress will be more evenly distributed in the circumferential direction of the first web 132 and the circumferential direction of the second web 133, thereby extending the service life of the web 130.

[0092] Combination Figure 1 , Fig.12 and Fig.13 In some embodiments, one axial end of the ring gear 120 has gear teeth 121, and all second winding structures 122 are located at the other axial end of the ring gear 120 to prevent the belly net 130 from interfering with the meshing cooperation between the gear teeth 121 and other gears, thereby facilitating the reliability and stability of the transmission cooperation between the face gear 100 and other gears, and preventing the belly net 130 from being worn by the gear teeth 121 or other gears, thereby increasing the service life of the belly net 130.

[0093] Combination Figures 12 to 15 In some embodiments of the present invention, a plurality of first winding structures 111 and gear teeth 121 corresponding to the first web 132 are located on the same axial side of the gear ring 120, and the gear ring 120 is provided with grooves 123 on the outer peripheral side of each second winding structure 122, and the radial outer sides of the grooves 123 are open, and the grooves 123 include a first groove segment 1231, a second groove segment 1232 and a third groove segment 1233, the first groove segment 1231 extends in the circumferential direction, the second groove segment 1232 and the third groove segment 1233 are respectively connected to the circumferential ends of the first groove segment 1231, and both extend radially to the inner circumferential wall passing through the gear ring 120, the side of the first groove segment 1231 corresponding to the first web 132 away from the gear tooth 121 is open, and the second winding structure 122 corresponding to the second web 133 extends to the side of the corresponding first groove segment 1231 away from the gear tooth 121.

[0094] Exemplarily, a groove 123 is provided on the outer peripheral side of the second winding structure 122 to avoid the belly net 130, so that the belly net 130 is conveniently wound on the second winding structure 122, wherein the belly net 130 can be wound on the radial outer side of the second winding structure 122 through the first groove segment 1231, and extend radially inwardly through the second groove segment 1232 and the third groove segment 1233 provided along the radial direction and penetrating the inner peripheral wall of the gear, thereby facilitating the belly net 130 to be wound on the first winding structure 111 located on the radial inner side.

[0095] Among them, the first winding structure 111 and the gear teeth 121 arranged corresponding to the first web 132 are located on the same axial side of the ring gear 120. When the first web 132 connects the wheel hub 110 with the ring gear 120, the axial force generated on the ring gear 120 is toward the side of the gear teeth 121, that is, the axial force generated by the first web 132 on the ring gear 120 is opposite to the opening direction of the first groove section 1231 corresponding to the first web 132. When the first web 132 is wound on the corresponding second winding structure 122, the first web 132 has a tendency to move toward the side of the gear teeth 121. The groove wall of the first groove section 1231 on the side of the gear teeth 121 can limit the first web 132 to prevent the first web 132 from sliding in the direction of the gear teeth 121, which is beneficial to improving the connection reliability between the first web 132 and the ring gear 120.

[0096] Therefore, taking into account the direction of the force exerted by the first web 132 on the ring gear 120, the first groove section 1231 corresponding to the first web 132 is opened on the side away from the gear tooth 121 to facilitate the processing of the second winding structure 122 corresponding to the first web 132, thereby helping to improve the processing convenience of the ring gear 120 without increasing the risk of the first web 132 slipping off the ring gear 120; and the above-mentioned arrangement is conducive to saving the axial dimension of the face gear 100.

[0097] Optionally, the second winding structure 122 corresponding to the first web 132 may be configured as a protruding column disposed in the groove 123 and extending in the axial direction toward a side away from the gear tooth 121 .

[0098] In addition, the first winding structure 111 corresponding to the second web 133 is located on the side of the ring gear 120 that is away from the gear teeth 121 in the axial direction. When the second web 133 connects the hub 110 with the ring gear 120, the axial force generated on the ring gear 120 is toward the side away from the gear teeth 121, that is, the axial force generated by the second web 133 on the ring gear 120 is opposite to the opening direction of the first groove section 1231 corresponding to the second web 133. In order to prevent the second web 133 from slipping off the second winding structure 122 corresponding to it, the second winding structure 122 corresponding to the second web 133 is extended to the side of the corresponding first groove section 1231 away from the gear teeth 121 to limit the second web 133 and prevent the second web 133 from slipping off the second winding structure 122 corresponding to it, which is beneficial to ensure the winding reliability of the second web 133 and the ring gear 120, and further to ensure the structural stability of the face gear 100.

[0099] Optionally, the second winding structure 122 corresponding to the second web 133 may be constructed as a boss with an L-shaped cross-section.

[0100] like Fig.16 As shown, the transmission system 200 according to the second embodiment of the present invention includes: an input shaft 210 and an output shaft 220. The input shaft 210 is a key component that receives external power and transmits it to the output shaft 220. The output shaft 220 can transmit power to an external device.

[0101] The transmission system 200 also includes a driving gear 230 and a driven gear. The driving gear 230 is fixed to the input shaft 210 and meshes with the driven gear. The driven gear is the above-mentioned face gear 100, and the hub 110 of the driven gear is fixed to the output shaft 220 to further transmit the power transmitted from the input shaft 210 to the driving gear 230 to the driven gear, and further transmit it to the output shaft 220 through the driven gear, thereby realizing the power output of the transmission system 200.

[0102] Since the driven gear is the above-mentioned face gear 100, by setting the belly net 130, it is beneficial to reduce the weight of the face gear 100, and at the same time it is beneficial to ensure the structural strength of the face gear 100. Considering that the mechanical properties of the carbon fiber rope 1301 along the direction of the fiber filament 13011 are the best, by constructing the belly net 130 as a carbon fiber rope 1301 that is alternately wound around the first winding structure 111 and the second winding structure 122 along a closed path and is formed by multiple unidirectional windings, the carbon fiber rope 1301 is mainly subjected to tension, which can also be understood as making the carbon fiber rope 1301 subjected to force along the direction of the fiber filament 13011, so as to give full play to the mechanical property advantages of the carbon fiber rope 1301, and it is beneficial to improve the processing convenience of the face gear 100, and at the same time it is beneficial to achieve the uniformity of force on the belly net 130, the first winding structure 111 and the second winding structure 122, improve stress concentration, and thus help to ensure that the face gear 100 can remain stable during the power transmission process, and then help to ensure the operating stability of the transmission system 200, and help to achieve a lightweight design of the transmission system 200.

[0103] Optionally, the transmission system 200 is a reduction transmission system to reduce the rotation speed and increase the torque.

[0104] In some embodiments, the driving gear 230 is sleeved outside the input shaft 210, and the inner circumferential wall of the driving gear 230 and the outer circumferential wall of the input shaft 210 that cooperates with the driving gear 230 are both non-circular (then the cross-sectional shape of the inner circumferential wall of the driving gear 230 is non-circular, and the cross-sectional shape of the outer circumferential wall of the input shaft 210 that cooperates with the driving gear 230 is non-circular), and the two are fixed by an adhesive layer, the thickness of the adhesive layer is t, 0.1mm≤t≤0.2mm, and the non-circular matching design makes the matching between the driving gear 230 and the input shaft 210 more precise, reduces the gap caused by improper matching, thereby improving the accuracy and stability of the transmission, and is fixed by an adhesive layer with a thickness of 0.1mm to 0.2mm, which can further enhance the connection strength between the driving gear 230 and the input shaft 210.

[0105] Reference Fig.16 In some embodiments of the present invention, the transmission system 200 also includes a shell 240, the shell 240 includes a first barrel portion 241 and a second barrel portion 242, the first barrel portion 241 has a accommodating cavity 2411, the driving gear 230 and the driven gear are both arranged in the accommodating cavity 2411, one axial end of the second barrel portion 242 is connected to the outer peripheral wall of the first barrel portion 241, and the axial direction of the second barrel portion 242 is perpendicular to the axial direction of the first barrel portion 241.

[0106] The first cylindrical portion 241 and the second cylindrical portion 242 together define a closed space to facilitate the arrangement of the driving gear 230, the driven gear and other internal mechanical components in the shell 240, and can isolate the driving gear 230, the driven gear and other internal mechanical components from the external environment, which is beneficial to reduce the risk of dust and other impurities entering the transmission system 200, thereby reducing the risk of failure of the transmission system 200.

[0107] Further references Fig.16 The transmission system 200 also includes a first cover plate 250 and a second cover plate 260. The first cover plate 250 is covered at one axial end of the first barrel portion 241. The output shaft 220 is passed through the first cover plate 250 and the output shaft 220 extends into the accommodating cavity 2411. The second cover plate 260 is covered at one axial end of the second barrel portion 242 away from the first barrel portion 241. The input shaft 210 is passed through the second cover plate 260 and the input shaft 210 extends into the accommodating cavity 2411.

[0108] By making the first cover plate 250 and the second cover plate 260 cover the axial end of the first cylindrical portion 241 and the second cylindrical portion 242 respectively, it is beneficial to further improve the sealing performance of the shell 240 and further reduce the risk of dust and other impurities entering the transmission system 200. At the same time, it can protect the internal components of the shell 240 from external impacts, which is beneficial to improve the operating stability of the transmission system 200 and facilitate the processing and forming of various components of the transmission system 200.

[0109] Among them, the housing 240, the first cover plate 250 and the second cover plate 260 are respectively composite materials, and the input shaft 210 and the output shaft 220 are respectively composite materials. For example, the housing 240, the first cover plate 250, the second cover plate 260, the input shaft 210 and the output shaft 220 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 are conducive to achieving lightweight design of the transmission system 200 while ensuring the structural strength of the transmission system 200. It can be understood that the specific composite materials forming the housing 240, the first cover plate 250, the second cover plate 260, the input shaft 210 and the output shaft 220 can be determined according to actual production requirements, and are not specifically limited here.

[0110] Combination Fig.17 and Fig.18The helicopter 1000 according to the third embodiment of the present invention comprises a power system 300, a rotor system 400 and the transmission system 200, wherein the transmission system 200 is connected between the power system 300 and the rotor system 400 to transmit the power of the power system 300 to the rotor system 400, and the input shaft 210 is connected to the power system 300, and the output shaft 220 is connected to the rotor system 400. Since the helicopter 1000 comprises the transmission system 200, it is beneficial to achieve the performance improvement and lightweight design of the helicopter 1000.

[0111] It can be understood that the type of the helicopter 1000 in the embodiment of the present invention is not limited, and 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, crossed twin-rotor helicopters and coaxial twin-rotor helicopters, etc.

[0112] For example, Figure 1-Figure 15 As shown, twelve first winding structures 111 may be provided on the hub 110, wherein six first winding structures 111 are arranged at intervals along the circumference of the hub 110 to form a first group 101, and the remaining six first winding structures 111 are arranged at intervals along the circumference of the hub 110 to form a second group 102, the first group 101 and the second group 102 are arranged at intervals along the axial direction, and are respectively located on both sides of the axial direction of the gear ring 120; the two belly nets 130 are respectively the first belly net 132 and the second belly net 133, the first belly net The net 132 corresponds to the first group 101, and the second web 133 corresponds to the second group 102; accordingly, the gear ring 120 is provided with twelve second winding structures 122 spaced apart along the circumferential direction, of which six second winding structures 122 correspond to the first web 132, and the remaining six second winding structures 122 correspond to the second web 133, and the six second winding structures 122 corresponding to the first web 132 and the six second winding structures 122 corresponding to the second web 133 are alternately arranged one by one along the circumferential direction. The first web 132 and the second web 133 have the same structure, both of which are formed by a carbon fiber rope 1301 that alternately winds the first winding structure 111 and the second winding structure 122 in sequence along a closed path and is wound in a unidirectional cycle multiple times, and the first web 132 is taken as an example for explanation below.

[0113] like Figure 2 and Figure 3 As shown, the winding path of the carbon fiber rope 1301 of the first belly net 132 can be:

[0114] “A01-A02-A03-A04-A05-A06-A07-A08-A09-A10-A11-A12-A13-A14-A15-A16-A17-A18-A19-A20-A21-A22-A23-A24-A01…” are wound in a loop in sequence, wherein A01, A05, A09, A13, A17 and A21 correspond to six second winding structures 122 respectively, A03, A07, A11, A15, A19 and A23 correspond to six first winding structures 111 respectively, and the orthographic projection of the closed path corresponding to the first web 132 has only two projection segments intersecting at each intersection position, and there is no intersection formed by three, four or more projection segments. For example, the above-mentioned orthographic projection does not exist in T-shape, cross-shape, etc.

[0115] The carbon fiber rope 1301 can be firstly wound on the first of the six first winding structures 111, and then the carbon fiber rope 1301 can extend in the radial direction toward the gear ring 120, and then the carbon fiber rope 1301 is wound on the second winding structure 122 corresponding to the first first winding structure 111, and extends in the radial direction toward the hub 110, and then the carbon fiber rope 1301 can be wound on the first winding structure 111 adjacent to the first first winding structure 111, and extends in the radial direction toward the gear ring 120, and then continues to be wound on the corresponding second winding structure 122. Thus, the carbon fiber rope 1301 is alternately wound on the six first winding structures 111 and the six second winding structures 122 in sequence according to the above-mentioned winding method, and is wound multiple times in a unidirectional cycle to form a belly net.

[0116] 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.

[0117] 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 wheel hub (110), wherein the wheel hub (110) has a plurality of first winding structures (111); A gear ring (120), the gear ring (120) being arranged around the wheel hub (110) at intervals, one of two axial ends of the gear ring (120) having a plurality of gear teeth (121), and the gear ring (120) having a plurality of second winding structures (122), all of the second winding structures (122) being located at the other axial end of the gear ring (120); A belly net (130), the belly net (130) being formed by a carbon fiber rope (1301) being alternately wound around the first winding structure (111) and the second winding structure (122) in sequence along a closed path and being wound multiple times in a unidirectional cycle, so that the belly net (130) forms an annular structure, the radial inner end of the belly net (130) being connected to a plurality of the first winding structures (111), and the radial outer end of the belly net (130) being connected to a plurality of the second winding structures (122), wherein the belly net (130) is a plurality of and includes a first belly net (132) and a second belly net (133), the plurality of the first winding structures (111) corresponding to the first belly net (132) forming a first group (101), the plurality of the first winding structures (111) corresponding to the second belly net (133) forming a second group (102), the first group (101) and the second group (102) being spaced apart in the axial direction, and both being spaced apart on both axial sides of the gear ring (120).

2. The face gear according to claim 1, characterized in that: The belly web (130) comprises a plurality of winding segments (131) connected end to end in sequence, each of the winding segments (131) comprising a first segment (1311) and a second segment (1312) connected in sequence, the first segment (1311) being arranged around a first winding structure (111), and the second segment (1312) being arranged around a second winding structure (122), and on a cross section of the face gear, an orthographic projection of each winding segment (131) has no intersection with an orthographic projection of the remaining winding segments (131) except for two adjacent winding segments (131).

3. The face gear according to claim 2, characterized in that: A plurality of the first winding structures (111) are arranged at intervals along the circumferential direction, a plurality of the second winding structures (122) are arranged at intervals along the circumferential direction, and a plurality of the winding sections (131) are arranged in sequence along the circumferential direction.

4. The face gear according to claim 3, characterized in that: The first section (1311) and the second section (1312) are respectively formed into open rings, the opening of the first section (1311) faces radially outward, and the opening of the second section (1312) faces radially inward.

5. The face gear according to claim 1, characterized in that: The first web (132) and the second web (133) have the same shape and are staggered in the circumferential direction; the plurality of second winding structures (122) corresponding to the first web (132) and the plurality of second winding structures (122) corresponding to the second web (133) are alternately arranged one by one in the circumferential direction.

6. The face gear according to claim 1, characterized in that: A plurality of first winding structures (111) and the gear teeth (121) corresponding to the first web (132) are located on the same axial side of the gear ring (120); the gear ring (120) is provided with a groove (123) on the outer circumferential side of each of the second winding structures (122); the radial outer sides of the grooves (123) are open, and the grooves (123) include a first groove segment (1231), a second groove segment (1232) and a third groove segment (1233); the first groove segment (1231) extends in the circumferential direction; the second groove segment (1232) and the third groove segment (1233) are respectively connected to the circumferential ends of the first groove segment (1231), and both extend in the radial direction to the inner circumferential wall that passes through the gear ring (120); The first slot section (1231) corresponding to the first web (132) is open on a side facing away from the gear tooth (121), and the second winding structure (122) corresponding to the second web (133) extends to a side of the first slot section (1231) facing away from the gear tooth (121).

7. A transmission system, characterized in that: include: An input shaft (210) and an output shaft (220); A driving gear (230) and a driven gear, wherein the driving gear (230) is fixedly mounted on the input shaft (210) and meshes with the driven gear, the driven gear is a face gear according to any one of claims 1 to 6, and the hub (110) of the driven gear is fixedly mounted on the output shaft (220).

8. A helicopter, characterized in that: The invention comprises a power system (300), a rotor system (400), and a transmission system according to claim 7, wherein the transmission system is connected between the power system (300) and the rotor system (400) to transmit the power of the power system (300) to the rotor system (400).

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