Face gear, transmission system and helicopter

Abstract

The utility model discloses a face gear, a transmission system and a helicopter, the face gear comprises a hub, the hub is provided with two positioning groups, the plurality of positioning groups are arranged at intervals along the axial direction of the face gear, each positioning group comprises a plurality of first positioning structures, and the plurality of first positioning structures of each positioning group are arranged at intervals along the circumferential direction of the face gear; the gear rings are arranged around the hub at intervals, each gear ring is provided with a plurality of second positioning structures, and the multiple second positioning structures are arranged in the circumferential direction of the face gear at intervals; the abdominal net comprises two groups of rope nets corresponding to the two positioning groups, each group of rope nets comprises a plurality of carbon fiber ropes, the first ends of the carbon fiber ropes of each group of rope nets are mounted on the first positioning structures of the corresponding positioning groups, and the second ends of the carbon fiber ropes of each group of rope nets are mounted on the second positioning structures. According to the face gear provided by the embodiment of the utility model, the web net is arranged, so that the structural strength of the face gear can be ensured, and the overall weight of the face gear can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of helicopters, 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, having 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.

[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. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a face gear having good structural stability and can effectively reduce the weight of the face gear.

[0005] The utility model also provides a transmission system.

[0006] The utility model also provides a helicopter.

[0007] According to the embodiment of the first aspect of the present invention, the face gear includes: a hub, two positioning groups are provided on the hub, and the multiple positioning groups are arranged at intervals along the axial direction of the face gear, each of the positioning groups includes a plurality of first positioning structures, and the multiple first positioning structures of each positioning group are arranged at intervals along the circumference of the face gear; a ring gear, the ring gear is arranged around the outside of the hub at intervals, the ring gear has a plurality of second positioning structures, and the multiple second positioning structures are arranged at intervals along the circumference of the face gear; a belly net, the belly net includes two groups of rope nets corresponding to the two positioning groups, each group of rope nets includes a plurality of carbon fiber ropes, and each group of rope nets The first end of the carbon fiber rope is installed on the first positioning structure corresponding to the positioning group, and the second end of the carbon fiber rope of each group of the rope nets is installed on the second positioning structure, wherein the second ends of the multiple carbon fiber ropes of one group of the rope nets are located on one side of the first end of the carbon fiber rope in the clockwise direction, the second ends of the multiple carbon fiber ropes of another group of the rope nets are located on one side of the first end of the carbon fiber rope in the counterclockwise direction, and the second end of the carbon fiber rope of one group of the rope nets is located between the second ends of two adjacent carbon fiber ropes of another group of the rope nets.

[0008] According to the face gear of the embodiment of the present invention, by setting the above-mentioned belly net, that is, installing the two ends of the carbon fiber rope on the corresponding first positioning structure and the second positioning structure respectively, each carbon fiber rope can be subjected to only tensile force, that is, each carbon fiber rope is subjected to force only along the direction of the fiber filament, which can give full play to the mechanical performance advantages of the carbon fiber rope, is beneficial to ensure the uniformity of force on the belly net, the hub and the gear ring, improve stress concentration, and thus is beneficial to ensure the stability of the face gear in the process of transmitting power; and compared with the solution in which the gear ring is connected to the hub through the belly plate, the structural strength of the face gear can be guaranteed, and the overall weight of the face gear can be reduced.

[0009] According to some embodiments of the present invention, the first positioning structures of two adjacent positioning groups are staggered in the circumferential direction of the face gear.

[0010] According to some embodiments of the present invention, a plurality of the second positioning structures are staggeredly arranged in the axial direction of the face gear.

[0011] According to some embodiments of the present invention, the second positioning structure is a threaded hole passing through the gear ring, and the second end of the carbon fiber rope is threadedly engaged with the second positioning structure.

[0012] In some examples, the first positioning structure is a tether stake, and the first end of the carbon fiber rope is plug-fitted to the first positioning structure.

[0013] In some examples, the carbon fiber rope includes a carbon fiber bundle, a first inner mold, a second inner mold, a hoop, two clips and a locking nut. The carbon fiber bundle is wound around the first inner mold and the second inner mold, and the hoop is locked on the outermost side of the carbon fiber bundle. The two clips are wrapped around the outer side of the carbon fiber bundle and the second inner mold and are clamped to each other. The locking nut is sleeved on the outside of the two clips to lock the two clips. The outer periphery of the locking nut has an external thread that cooperates with the thread of the second positioning structure, and the first inner mold has a socket that is plugged into and cooperates with the first positioning structure.

[0014] In some examples, the two snap-fits form a truncated cone structure, the locking nut has a locking hole, and the hole wall of the locking hole has the same inclination angle as the outer side surface of the truncated cone structure.

[0015] According to some embodiments of the present invention, the wheel hub includes: a shaft body; two flanges, the two flanges are sleeved on the shaft body and arranged at intervals along the axial direction of the shaft body, each flange is provided with a group of the positioning groups, wherein the flanges are equilateral polygonal cylinders, and multiple first positioning structures correspond to multiple sides of each flange, and the first positioning structure is a tethering rope pile protruding from the outer wall of the flange.

[0016] According to the transmission system of the embodiment of the second aspect of the present invention, it includes: an input shaft and 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 the face gear according to the embodiment of the first aspect of the present invention, and the hub of the driven gear is fixed to the output shaft.

[0017] According to the transmission system of the embodiment of the present invention, by adopting the above-mentioned face gear, the mechanical properties advantages of the carbon fiber rope can be fully utilized, and the stability of the face gear in the process of transmitting power can be improved, which is beneficial to ensuring the operating stability of the transmission system and is conducive to achieving a lightweight design of the transmission system.

[0018] A helicopter according to an embodiment of the third aspect of the present invention includes a power system, a rotor system and a transmission system according to an embodiment of the third 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.

[0019] According to the helicopter of the embodiment of the present invention, by adopting the above-mentioned transmission system, it is beneficial to reduce the weight of the helicopter, to achieve a lightweight design of the helicopter, and to ensure the stability of the helicopter operation.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or 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 readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 is a schematic structural diagram of a face gear according to some embodiments of the present utility model;

[0023] Figure 2 is a schematic structural diagram of a gear ring according to some embodiments of the present utility model;

[0024] Figure 3 This is a schematic diagram of the partial structure of the belly net according to some embodiments of the present invention at one viewing angle;

[0025] Figure 4 is a schematic diagram of the partial structure of the belly net according to some embodiments of the present invention from another perspective;

[0026] Figure 5 This is a schematic structural diagram of a carbon fiber rope according to some embodiments of the present invention at one viewing angle;

[0027] Figure 6 yes Figure 5 A magnified view of the structure in the middle;

[0028] Figure 7 yes Figure 5 A magnified view of the structure in middle B;

[0029] Figure 8 is a schematic structural diagram of a carbon fiber rope according to some embodiments of the present invention from another perspective;

[0030] Figure 9 is a schematic structural diagram of a carbon fiber rope according to some embodiments of the present invention from another perspective;

[0031] Figure 10 is a schematic diagram of an explosion of a carbon fiber rope according to some embodiments of the present invention;

[0032] Figure 11 is a schematic structural diagram of a wheel hub according to some embodiments of the present invention at a certain viewing angle;

[0033] Figure 12 is a schematic structural diagram of a wheel hub according to some embodiments of the present invention from another perspective;

[0034] Figure 13 It is along Figure 12 Cross-sectional view along the CC section line;

[0035] Figure 14 It is along Figure 12 Cross-sectional view along the DD section line.

[0036] Reference numerals:

[0037] Face gear 100,

[0038] Hub 10, first positioning structure 11, shaft 12, flange 13,

[0039] Ring gear 20, second positioning structure 21, gear teeth 22,

[0040] Belly net 30 , carbon fiber rope 31 , first inner mold 311 , insertion hole 3111 , second inner mold 312 , carbon fiber tow 313 , tie hoop 314 , buckle 315 , locking nut 316 , locking hole 3161 , external thread 3162 . DETAILED DESCRIPTION

[0041] The following describes embodiments of the present invention in detail. Examples of the embodiments 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 intended only to explain the present invention and are not to be construed as limiting the present invention.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0043] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0044] Reference below Figures 1-14 A face gear 100 according to an embodiment of the present invention will be described.

[0045] like Figures 1-14 As shown, the face gear 100 according to the embodiment of the present invention includes: a hub 10, a gear ring 20 and a web 30. The hub 10 can be provided with two positioning groups, and the plurality of positioning groups can be arranged along the axial direction of the face gear 100 (such as Figure 1 The first positioning structures 11 are arranged at intervals in the vertical direction (as shown in the figure), each positioning group includes a plurality of first positioning structures 11, and the plurality of first positioning structures 11 of each positioning group can be arranged at intervals along the circumference of the face gear 100.

[0046] The ring gear 20 can be arranged around the outer periphery of the hub 10 and in the radial direction of the face gear 100 (eg Figure 1In the inner and outer directions shown in FIG, the ring gear 20 and the hub 10 can be arranged at intervals, and the ring gear 20 can have a plurality of second positioning structures 21. The plurality of second positioning structures 21 can be arranged at intervals along the circumference of the face gear 100. In the axial direction of the face gear 100 (as shown in FIG, Figure 1 In the up and down direction shown in FIG), both ends of the gear ring 20 (as shown in FIG Figure 1 At least one of the upper and lower ends (as shown) can have a plurality of gear teeth 22 for transmission of the transmission system, which can prevent the web 30 from interfering with the meshing cooperation of the gear teeth 22 and other gears, thereby helping to ensure the reliability and stability of the transmission cooperation between the face gear 100 and other gears, and helping to prevent the web 30 from being worn by the gear teeth 22 or the other gears mentioned above, which can increase the service life of the web 30.

[0047] The belly net 30 may include two groups of rope nets, the two groups of rope nets may correspond to the two positioning groups, each group of rope nets may include a plurality of carbon fiber ropes 31, the first end of the carbon fiber rope 31 of each group of rope nets (such as Figure 1 The inner end shown in FIG) can be installed on the first positioning structure 11 of the corresponding positioning group, and the second end of the carbon fiber rope 31 of each group of rope nets (as shown in FIG) can be installed on the first positioning structure 11 of the corresponding positioning group. Figure 1 The outer end shown in the figure can be installed on the second positioning structure 21 of the corresponding positioning group, so that the belly net 30 can connect the ring gear 20 to the hub 10, and power can be transmitted between the hub 10 and the ring gear 20 through the belly net 30. By setting the belly net 30, it is beneficial to reduce the overall weight of the face gear 100.

[0048] Therefore, the above-mentioned setting of the belly net 30 is conducive to improving the processing convenience of the face gear 100, and by respectively installing the two ends of the carbon fiber rope 31 on the corresponding first positioning structure 11 and the second positioning structure 21, each carbon fiber rope 31 can only bear tension, that is, each carbon fiber rope 31 is only subjected to force along the fiber direction, which can give full play to the mechanical properties of the carbon fiber rope 31, thereby helping to ensure the uniformity of force on the hub 10 and the ring gear 20, and helping to improve stress concentration, which is conducive to improving the stability of the face gear 100 in the process of transmitting power.

[0049] And by the axial direction of the hub 10 (such as Figure 1 A group of rope nets are respectively arranged on both sides of the axial direction of the gear ring 20), so that a group of rope nets can be arranged on both sides of the axial direction of the gear ring 20, and the axial forces of the two groups of rope nets acting on the gear ring 20 can balance each other, so as to improve the stability of the connection between the gear ring 20 and the hub 10 in the axial direction. At the same time, the radial forces of the two groups of rope nets acting between the hub 10 and the gear ring 20 can be superimposed on each other, so as to improve the radial direction (as shown in FIG. Figure 1 The reliability of the connection in the inner and outer directions (as shown) is beneficial to improving the structural stability of the face gear 100.

[0050] It can be understood that the shapes of the two groups of rope nets can be the same, which is conducive to achieving good consistency between the force exerted by one group of rope nets on the ring gear 20 and the hub 10 and the force exerted by the other group of rope nets on the ring gear 20 and the hub 10, thereby helping to further improve the structural stability of the face gear 100 and facilitate processing. Of course, the number of rope nets can be two, three, four or more groups.

[0051] Among them, Figure 1 For example, from a top-down perspective, the face gear 100 can rotate clockwise or counterclockwise, as shown in FIG. Figure 1 、 Figure 3 and Figure 4 As shown, the second ends of a plurality of carbon fiber ropes 31 of a group of rope nets (such as Figure 1 The outer end shown in FIG. 3 may be located at the first end of the carbon fiber rope 31 (e.g. Figure 1 The inner end shown in the figure is on one side in the clockwise direction, the second ends of the multiple carbon fiber ropes 31 of the other group of rope nets are located on one side of the first end of the carbon fiber rope 31 in the counterclockwise direction, and in the circumferential direction of the face gear 100, the second end of the carbon fiber rope 31 of one group of rope nets is located between the second ends of two adjacent carbon fiber ropes 31 of the other group of rope nets.

[0052] Therefore, the above-mentioned setting of the belly net 30 can make the tensions on the carbon fiber ropes 31 of the two groups of rope nets in opposite directions with respect to the torque of the rotation axis of the face gear 100, and can make the tensions on the carbon fiber ropes 31 of the two groups of rope nets in balance with respect to the torque of the rotation axis of the face gear 100. At the same time, it can make the forces on the hub 10 and the ring gear 20 more uniform, thereby further improving stress concentration and enhancing the stability of the face gear 100 during power transmission.

[0053] It can be understood that during the operation of the face gear 100, especially in an environment with high speed, heavy load or high stability requirements, the ring gear 20 will be subjected to greater stress and torque. The web 30 can effectively disperse these stresses and prevent the ring gear 20 from being deformed or broken due to stress concentration. The web 30 can also enhance the overall rigidity of the face gear 100, and improve the stability and reliability of the face gear 100 during the transmission process.

[0054] It should be noted that the carbon fiber rope 31 can be 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 (abbreviated as 48K) is called large-tow carbon fiber. By adopting appropriate process flow, carbon fiber bundles of appropriate specifications can be prepared into structural elements with specific functions, which are usually called continuous carbon fiber ropes.

[0055] According to the face gear 100 of the embodiment of the present invention, by setting the above-mentioned web 30, that is, installing the two ends of the carbon fiber rope 31 on the corresponding first positioning structure 11 and the second positioning structure 21 respectively, each carbon fiber rope 31 can be made to bear only tensile force, that is, each carbon fiber rope 31 is only subjected to force along the direction of the fiber filament, which can give full play to the mechanical performance advantages of the carbon fiber rope 31, is conducive to ensuring the uniformity of force on the web 30, the hub 10 and the ring gear 20, and improving stress concentration, which is conducive to ensuring the stability of the face gear 100 in the process of transmitting power; and compared with the solution in which the ring gear 20 is connected to the hub 10 through the web, the structural strength of the face gear 100 can be guaranteed, and the overall weight of the face gear 100 can be reduced.

[0056] like Figure 1 、 Figure 3 and Figure 4 As shown, according to some embodiments of the present invention, the first positioning structures 11 of two adjacent positioning groups are staggered in the circumferential direction of the face gear 100, that is, in the circumferential direction of the face gear 100, the first positioning structure 11 of one positioning group can be located between two adjacent first positioning structures 11 of another positioning group. Further, the first end of the carbon fiber rope 31 of a group of rope nets (such as Figure 1 The inner end shown in FIG1 is located between the first ends of two adjacent carbon fiber ropes 31 of another group of rope nets, and because the second end of the carbon fiber rope 31 of one group of rope nets (as shown in FIG1 Figure 1 The outer end shown in the figure is located between the second ends of two adjacent carbon fiber ropes 31 of another group of rope nets, so that the force on the hub 10 and the ring gear 20 can be more uniform, stress concentration can be improved, and the stability of the face gear 100 during power transmission can be improved.

[0057] like Figure 1 and Figure 2 As shown, according to some embodiments of the present invention, a plurality of second positioning structures 21 are arranged in the axial direction of the face gear 100 (eg Figure 2 The staggered arrangement in the upper and lower directions (as shown) can reduce the axial spacing between the corresponding first positioning structure 11 and the second positioning structure 21 in the face gear 100, and the rotation axis of the face gear 100 can be perpendicular to a plane, thereby reducing the slope of the carbon fiber rope 31 relative to the plane, so that each carbon fiber rope 31 only bears tension, and can give full play to the mechanical properties of the carbon fiber rope 31, which is beneficial to ensure the uniformity of force on the hub 10 and the ring gear 20, and is beneficial to improving stress concentration, and is beneficial to improving the stability of the face gear 100 in the process of transmitting power.

[0058] like Figure 1 、 Figure 3 and Figure 4As shown, according to some embodiments of the present invention, the two groups of rope nets can be staggered along the circumference of the face gear 100. For example, on the cross-section of the face gear 100, the orthographic projection surface of one group of rope nets and the orthographic projection surface of the other group of rope nets can have an overlapping area but do not completely coincide, which facilitates the arrangement of the two groups of rope nets between the ring gear 20 and the hub 10 and is beneficial to improving the space utilization on the face gear 100.

[0059] Moreover, the two groups of rope nets have a certain circumferential rotational symmetry, which can more evenly distribute the loads from all directions, help reduce local overloads and stress concentration, and thus improve the stability and durability of the entire face gear 100 structure. It can be understood that the specific arrangement of the belly net 30 can be determined according to actual production requirements, and no specific limitation is made here, as long as the structural stability of the face gear 100 is guaranteed.

[0060] like Figure 1 、 Figure 2 、 Figure 5 and Figure 7 As shown, according to some embodiments of the present invention, the second positioning structure 21 can be a threaded hole that passes through the gear ring 20, and the second end of the carbon fiber rope 31 (such as Figure 1 The outer end shown in the figure can be threadedly engaged with the second positioning structure 21. On the basis of ensuring that the carbon fiber rope 31 is threadedly connected to the ring gear 20, it is convenient to adjust the relative position of the second end of the carbon fiber rope 31 and the second positioning structure 21. For example, the second end of the carbon fiber rope 31 can be rotated relative to the threaded hole so that the second end of the carbon fiber rope 31 can move along the axial direction of the threaded hole, thereby realizing the adjustment of the tension of the carbon fiber rope 31, and is conducive to adjusting the tightness of the carbon fiber rope 31, thereby ensuring the working performance of the face gear 100 during the transmission process.

[0061] like Figure 1 、 Figure 5 、 Figure 6 and Figure 11 As shown, in some examples, the first positioning structure 11 can be a tether pile, and the first end of the carbon fiber rope 31 (such as Figure 1 The inner end shown in the figure can be plugged into and matched with the first positioning structure 11, so as to realize the detachable connection between the carbon fiber rope 31 and the hub 10, thereby ensuring the connection effect between the carbon fiber rope 31 and the hub 10 and facilitating operation.

[0062] like Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10As shown, in some examples, the carbon fiber rope 31 may include a carbon fiber tow 313, a first inner mold 311, a second inner mold 312, a tie hoop 314, two buckles 315 and a locking nut 316. The carbon fiber tow 313 can be wound around the first inner mold 311 and the second inner mold 312, and the tie hoop 314 can be locked on the outermost side of the carbon fiber tow 313. The first inner mold 311 can be fixed to the first end of the carbon fiber rope 31 (as shown in FIG. Figure 1 The second inner mold 312 can be fixed to the second end of the carbon fiber rope 31 (as shown in FIG. Figure 1 The outer end shown in the figure is beneficial to increase the size of the end of the carbon fiber rope 31 for easy installation. It can be understood that the number of turns of the carbon fiber tow 313 wrapped around the first inner mold 311 and the second inner mold 312 can be equal to one turn or greater than one turn.

[0063] The first inner mold 311 may have a socket 3111, and the socket 3111 may be plugged into and matched with the first positioning structure 11 to facilitate the first end (such as Figure 1 The inner end shown in the figure) is mounted on the first positioning structure 11; the two buckles 315 can be wrapped around the outer sides of the carbon fiber tow 313 and the second inner mold 312, and the two buckles 315 can be clamped to each other to fix the buckle 315 on the end of the carbon fiber tow 313 (as shown in the figure); Figure 1 outer end shown).

[0064] The locking nut 316 can be sleeved on the outside of the two buckles 315 to lock the two buckles 315, so as to fix the locking nut 316 on the two buckles 315, and the outer periphery of the locking nut 316 can have an external thread 3162, so that the locking nut 316 can be threadedly matched with the second positioning structure 21 to facilitate the second end of the carbon fiber rope 31 (such as Figure 1 The outer end shown) is mounted on the second positioning structure 21.

[0065] like Figure 8 and Figure 10 As shown, in some examples, the two clips 315 can cooperate with each other to form a frustum structure, and the locking nut 316 can have a locking hole 3161. The inclination angle of the hole wall of the locking hole 3161 can be the same as the inclination angle of the outer side surface of the frustum structure, which can improve the fit between the frustum structure and the locking hole 3161 and ensure the fixing effect of the locking nut 316 at the two clips 315.

[0066] Specifically, in the direction from the second end of the carbon fiber rope 31 toward the first end (such as Figure 1The cross-sectional dimensions of the frustum structure and the locking hole 3161 gradually decrease (as shown in the direction from outside to inside), which can prevent the carbon fiber bundle 313 from being separated from the locking nut 316 when the carbon fiber rope 31 is subjected to tension, thereby improving the stability and reliability of the face gear 100 during the transmission process.

[0067] like Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 and Figure 14 As shown, according to some embodiments of the present invention, the hub 10 may include: a shaft 12 and two flanges 13, the two flanges 13 may be sleeved on the shaft 12, the two flanges 13 may be connected to the shaft 12 (for example, by welding), or the two flanges 13 may be integrally formed with the shaft 12, the two flanges 13 may be along the axial direction of the shaft 12 (for example, Figure 11 The flanges 13 are spaced apart in the upper and lower directions as shown, and a group of positioning groups can be respectively provided on each flange 13, wherein the two flanges 13 can be equilateral polygonal cylinders respectively, and the multiple first positioning structures 11 can respectively correspond to the multiple sides of each flange 13, which can ensure the uniformity of the force on the flanges 13, and is conducive to improving stress concentration, and is conducive to improving the stability of the face gear 100 in the process of transmitting power.

[0068] The first positioning structure 11 can be a tether rope pile, which can protrude from the outer wall of the flange 13 to facilitate the insertion and matching of the insertion hole 3111 of the first inner mold 311 with the first positioning structure 11, so as to facilitate the first end of the carbon fiber rope 31 (such as Figure 1 The inner end shown in the figure is installed on the first positioning structure 11, and can ensure the connection effect between the carbon fiber rope 31 and the first positioning structure 11, and ensure the stability of the face gear 100 during the power transmission process.

[0069] In some embodiments of the present invention, the hub 10 and the ring gear 20 are respectively metal parts, and the face gear 100 can be a composite gear of a continuous fiber reinforced composite material and a metal material mixture; two or more composite material or metal material structural elements are connected and designed for use, and the connection parts are made to be able to withstand and transmit specific loads. The structure in which the composite material structural elements and the metal material structural elements are physically connected to form a functional whole is called a hybrid structure.

[0070] Metal is a high-strength material that can withstand large mechanical stresses and loads. Therefore, the hub 10 and ring gear 20 made of metal usually have excellent load-bearing capacity and durability, and can be suitable for various heavy-load and high-speed applications. At the same time, the fatigue strength of metal is high, which helps to reduce the risk of fatigue damage of the hub 10 and ring gear 20, thereby helping to improve the structural stability of the face gear 100.

[0071] In other words, the advantages of metal materials are good machining performance, high machining precision, balanced mechanical properties, and high contact strength, but their main disadvantages are 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 main disadvantages are poor machining performance, poor machining precision, and low contact strength. The mixed face gears in the embodiments of the present application can optimize material selection and structural design based on the different properties of the materials, so as to achieve high performance, lightweight, and low cost.

[0072] According to some embodiments of the present invention, the carbon fiber rope 31 is formed by multiple fiber filaments. The type of the carbon fiber rope 31 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.

[0073] In some examples, the carbon fiber rope 31 can be a parallel fiber bundle rope, which can be used under conditions of manual winding or mechanical automatic winding. After the carbon fiber rope 31 is installed and the tension of the carbon fiber rope 31 is adjusted, the face gear 100 can be placed as a whole in an autoclave and cured according to the curing process requirements of the carbon fiber and resin to further improve the structural stability of the face gear 100.

[0074] Obviously, the belly net 30 has excellent high specific strength, high specific modulus, fatigue resistance, corrosion resistance, comprehensive performance, etc., and has good designability (it can be actively tailored and designed according to the stress flow direction and stress magnitude of the component), and its material and structural component are integrated (the material and structural component are formed at the same time to improve the integrity of the component). It can be understood that the specific type of carbon fiber rope 31 can be determined according to actual production requirements and is not specifically limited here.

[0075] According to the transmission system of the embodiment of the present invention, it includes: an input shaft, an output shaft, a driving gear and a driven gear. The input shaft is a key component that receives external power and transmits it to the output shaft. The output shaft can transmit power to an external device. The driving gear is fixed to the input shaft, and the driving gear is meshed with the driven gear. The driven gear is the above-mentioned face gear 100, and the hub 10 of the driven gear is fixed to the output shaft to further transmit the power transmitted from the input shaft to the driving gear to the driven gear, and further transmit it to the output shaft through the driven gear, thereby realizing the power output of the transmission system.

[0076] Since the driven gear of the transmission system is the above-mentioned face gear 100, the provision of the belly net 30 is beneficial to reducing the weight of the face gear 100, while ensuring the structural strength of the face gear 100. Considering that the mechanical properties of the carbon fiber rope 31 along the fiber filament direction are best, by respectively installing the two ends of the carbon fiber rope 31 on the corresponding first positioning structure 11 and the second positioning structure 21, each carbon fiber rope 31 can only bear tension, that is, each carbon fiber rope 31 is only subjected to force along the fiber filament direction, which can give full play to the mechanical performance advantages of the carbon fiber rope 31; optionally, the transmission system is a reduction transmission system to reduce the rotation speed and increase the torque.

[0077] According to the transmission system of the embodiment of the present invention, by adopting the above-mentioned face gear 100, the mechanical performance advantages of the carbon fiber rope 31 can be fully utilized, and the stability of the face gear 100 in the process of transmitting power can be improved, which is beneficial to ensuring the operating stability of the transmission system and is conducive to achieving a lightweight design of the transmission system.

[0078] According to the embodiment of the present invention, the helicopter includes a power system, a rotor system and a transmission system. 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. The input shaft is connected to the power system, and the output shaft is connected to the rotor system. Since the helicopter includes the above-mentioned transmission system, it is conducive to achieving performance improvement and lightweight design of the helicopter. It can be understood that the type of the helicopter 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 helicopter includes a longitudinal twin-rotor helicopter, a transverse twin-rotor helicopter, a cross-rotor helicopter and a coaxial twin-rotor helicopter, etc.

[0079] According to the helicopter of the embodiment of the present invention, by adopting the above-mentioned transmission system, it is beneficial to reduce the weight of the helicopter, to achieve a lightweight design of the helicopter, and to ensure the stability of the helicopter operation.

[0080] The remaining configuration and operation of the face gear 100 according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here. In the description of the present invention, "first feature" and "second feature" may include one or more of these features. The vertical, horizontal, and front-to-back directions are those shown in the figure.

[0081] In the description of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but through another feature therebetween. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is at a higher level than the second feature.

[0082] Throughout this specification, reference to terms such as "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 that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative use of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0083] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose 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, wherein two positioning groups are provided on the wheel hub, wherein the plurality of positioning groups are arranged at intervals along the axial direction of the face gear, each of the positioning groups comprises a plurality of first positioning structures, and the plurality of first positioning structures of each positioning group are arranged at intervals along the circumference of the face gear; A ring gear, the ring gear being arranged around the outside of the wheel hub at intervals, the ring gear having a plurality of second positioning structures, the plurality of second positioning structures being arranged at intervals along the circumference of the face gear; The abdominal net includes two groups of rope nets corresponding to the two positioning groups, each group of rope nets includes a plurality of carbon fiber ropes, the first end of the carbon fiber ropes of each group of rope nets is installed on the first positioning structure corresponding to the positioning group, and the second end of the carbon fiber ropes of each group of rope nets is installed on the second positioning structure. Among them, the second ends of the multiple carbon fiber ropes of one group of the rope nets are located on one side of the first end of the carbon fiber rope in the clockwise direction, the second ends of the multiple carbon fiber ropes of another group of the rope nets are located on one side of the first end of the carbon fiber rope in the counterclockwise direction, and the second ends of the carbon fiber ropes of one group of the rope nets are located between the second ends of two adjacent carbon fiber ropes of the other group of the rope nets.

2. The face gear according to claim 1, characterized in that: The first positioning structures of two adjacent positioning groups are staggeredly arranged in the circumferential direction of the face gear.

3. The face gear according to claim 1, characterized in that: A plurality of the second positioning structures are staggeredly arranged in the axial direction of the face gear.

4. The face gear according to any one of claims 1 to 3, characterized in that: The second positioning structure is a threaded hole passing through the gear ring, and the second end of the carbon fiber rope is threadedly engaged with the second positioning structure.

5. The face gear according to claim 4, characterized in that: The first positioning structure is a tether pile, and the first end of the carbon fiber rope is plug-fitted to the first positioning structure.

6. The face gear according to claim 4, characterized in that: The carbon fiber rope includes a carbon fiber bundle, a first inner mold, a second inner mold, a hoop, two clips and a locking nut. The carbon fiber bundle is wound around the first inner mold and the second inner mold, and the hoop is locked on the outermost side of the carbon fiber bundle. The two clips are wrapped around the outer side of the carbon fiber bundle and the second inner mold and are clamped to each other. The locking nut is sleeved on the outside of the two clips to lock the two clips. The outer periphery of the locking nut has an external thread that cooperates with the thread of the second positioning structure, and the first inner mold has a socket that is plugged into and cooperates with the first positioning structure.

7. The face gear according to claim 6, characterized in that: The two snaps are fitted together to form a truncated cone structure. The locking nut has a locking hole. The wall of the locking hole has the same inclination angle as the outer side surface of the truncated cone structure.

8. The face gear according to claim 1, wherein: The wheel hub comprises: Axis; Two flanges, the two flanges are sleeved on the shaft and arranged at intervals along the axial direction of the shaft, each flange is provided with a group of the positioning groups, wherein the flanges are equilateral polygonal cylinders, and multiple first positioning structures correspond to multiple sides of each flange, and the first positioning structure is a tether rope pile protruding from the outer wall of the flange.

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 to 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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