Helicopter composite material transmission system

Abstract

The utility model discloses a helicopter composite material transmission system, and relates to the field of transmission devices. The helicopter composite material transmission system comprises a machine shell; the number of the gears is at least two, the gears are sequentially connected in a power transmission mode, the gears are arranged in the machine shell, and the gears comprise an input gear and an output gear. At least one gear is a compound gear, and the compound gear comprises an axis supporting part which is a carbon fiber piece; the metal gear ring is connected with the axis supporting part, the metal gear ring and the axis supporting part are coaxially arranged, and gear teeth distributed at intervals in the circumferential direction are arranged on the metal gear ring; the axis supporting part and the metal gear ring are fixedly connected and rotate synchronously. The metal gear ring is adopted to provide high hardness and wear resistance for meshing transmission, the reliability during high torque transmission is ensured, the carbon fiber piece is adopted as the axis supporting part to obtain torsional strength, and meanwhile the weight of the coincident gear is reduced. Therefore, flight burden of the helicopter can be reduced, and flight energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the field of transmission devices, in particular to a helicopter composite material transmission system. Background Art

[0002] A helicopter generally consists of subsystems such as the powertrain, transmission, rotor, airframe, and flight equipment. The transmission system's task is to transfer the power of the powertrain to the rotor system according to specific rules. Common helicopter types include single-rotor helicopters with tail rotors, tandem twin-rotor helicopters, transverse twin-rotor helicopters, coaxial twin-rotor helicopters, crossed twin-rotor helicopters, and compound helicopters. With the continuous development of helicopter technology, increasingly stringent requirements are being placed on performance indicators such as the lift-to-drag ratio and power-to-weight ratio of the entire helicopter. Advanced materials, such as composite materials, are being used more and more extensively in the helicopter field. Currently, composite materials account for over 50% of the entire structure of advanced helicopters.

[0003] However, the current application of composite materials in helicopters is primarily focused on relatively simple, non-load-bearing components, such as skins, stringers, and stiffeners. High-performance metals are still the primary materials used in load-bearing components, as well as those subject to complex loads and dynamic and impact loads. Therefore, the powertrain and transmission systems are the only subsystems in modern helicopters that still make extensive use of metal, representing the largest portion of the helicopter's total weight and the key to improved performance and lightweight design.

[0004] From a structural perspective, helicopter transmission systems primarily consist of gears, shafts, housings, bearings, and auxiliary accessories. Gears are primarily manufactured from high-performance gear steel, shafts from metals such as alloy steel or titanium alloys, reducer housings from aluminum or magnesium alloys, and bearings primarily from high-performance bearing steel. Metal materials offer advantages such as excellent machinability, high machining precision, balanced mechanical properties, and high contact strength. However, their main drawbacks are high density and weight.

[0005] The advantages of composite materials are low density, high specific strength, high specific modulus and strong designability. How to apply composite materials to the transmission device of helicopters is one of the current research directions on how to reduce the total weight of helicopters. Utility Model Content

[0006] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a helicopter composite material transmission system to reduce weight.

[0007] The helicopter composite transmission system of the present invention includes: a housing defining a cabin; at least two gears, each connected in sequence for power transmission, disposed within the cabin; an input gear and an output gear, the input gear being used to connect to the helicopter's power system, and the output gear being used to connect to the helicopter's rotor system. At least one of the gears is a composite gear, comprising: an axial support portion formed of a carbon fiber member; a metal ring gear connected to the axial support portion, the metal ring gear being coaxially disposed with the axial support portion, and having circumferentially spaced teeth thereon; and the axial support portion and the metal ring gear being fixedly connected and rotating synchronously.

[0008] The helicopter composite transmission system of this invention utilizes a metal ring gear to provide high hardness and wear resistance for the meshing transmission, ensuring reliability during high-torque transmission. Carbon fiber components are used as the axial support to enhance torsional strength while reducing the weight of the overlapping gears. This reduces the helicopter's flight burden and energy consumption.

[0009] In some embodiments, the axial support portion includes multiple layers of carbon fiber prepreg cloth, and also includes an epoxy resin structural adhesive film bonded between two adjacent layers of the carbon fiber prepreg cloth. The axial support portion is molded and cured by multiple layers of the carbon fiber prepreg cloth and multiple layers of the epoxy resin structural adhesive film; or, the axial support portion is a carbon fiber 3D printed molded part.

[0010] In some embodiments, the axial support portion is an integrated tube.

[0011] Specifically, an integrally formed first web is provided on the outer periphery of the axial support portion, and the metal gear ring is connected to one axial side of the first web via a first fastener.

[0012] In some embodiments, the axial support portion is entirely a second web, and the center of the second web has a center hole; the composite gear further includes: a hub, the hub is fitted in the center hole, and the hub is a metal part.

[0013] Specifically, the second web includes at least two layers of sub-plates stacked in the axial direction, and each layer of the sub-plates is an integrally formed carbon fiber plate.

[0014] Furthermore, each layer of the sub-plates has an equal thickness, and the multiple layers of the sub-plates are stacked axially after being processed separately and connected between the wheel hub and the metal gear ring. The composite gear also includes: a second fastener that penetrates and connects at least two layers of the sub-plates.

[0015] Furthermore, each layer of the sub-plates is an integrated 3D printed plate, and the multiple layers of the sub-plates are printed and arranged in sequence along the axial direction; the wheel hub and the metal gear ring are connected to the sub-plates by curing the sub-plates.

[0016] In some embodiments, an integral flange is provided on the inner circumference of the metal gear ring; and the second web comprises:

[0017] a first sub-plate, the first sub-plate being located on one axial side of the flange;

[0018] a second sub-plate, the second sub-plate being located in the space enclosed by the flange;

[0019] a third sub-plate, the third sub-plate being located on the other axial side of the flange;

[0020] The flange is sandwiched between the first sub-board and the third sub-board, and the first sub-board is connected to the third sub-board.

[0021] In some embodiments, the metal gear ring is fixedly connected to the axial support portion by gluing.

[0022] 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

[0023] 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:

[0024] Figure 1 A schematic structural diagram of a helicopter according to some embodiments of the present invention;

[0025] Figure 2 Schematic diagram of the connection structure of the helicopter composite material transmission system, power system and rotor system in some embodiments of the present invention;

[0026] Figure 3 Schematic diagram of the internal structure of a helicopter composite transmission system according to some embodiments of the present invention;

[0027] Figure 4 This is a layer structure diagram of a composite gear according to some embodiments of the present invention;

[0028] Figure 5 Exploded diagrams of compound gears according to some embodiments of the present invention;

[0029] Figure 6 Exploded views of compound gears according to other embodiments of the present invention;

[0030] Figure 7 is an isometric view of a compound gear according to some other embodiments of the present invention;

[0031] Figure 8 for Figure 7 Exploded view of the compound gear shown;

[0032] Figure 9 for Figure 7 A schematic cross-sectional view of the compound gear shown;

[0033] Figure 10 is an isometric view of a compound gear according to some further embodiments of the present invention;

[0034] Figure 11 for Figure 10 Exploded view of the compound gear shown;

[0035] Figure 12 for Figure 10 Schematic cross-sectional view of the compound gear shown.

[0036] Reference numerals:

[0037] Helicopter Composite Drive System 1000;

[0038] Gear 100;

[0039] Axial support portion 10, first web 13-1, second web 13-2, sub-plate 130, first sub-plate 1301, second sub-plate 1302, third sub-plate 1303;

[0040] Wheel hub 15;

[0041] Carbon fiber prepreg 101, epoxy resin structural adhesive film 102;

[0042] Metal gear ring 40, gear teeth 41, flange 44,

[0043] A first fastener 51 and a second fastener 52;

[0044] Housing 200, housing 203;

[0045] Input gear 100-1, output gear 100-2;

[0046] Power system 2000, rotor system 3000. DETAILED DESCRIPTION

[0047] 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.

[0048] In the description of the present invention, it should be understood that the terms "upper," "lower," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, 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, "plurality" means two or more.

[0049] 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.

[0050] Please refer to the following Figures 1-12 A helicopter composite transmission system 1000 according to the present invention is described.

[0051] According to the helicopter composite material transmission system 1000 of the embodiment of the present invention, Figure 1-Figure 3 , including: a casing 200 and a gear 100, a cabin 203 is defined in the casing 200, there are at least two gears 100 and they are connected in sequence by power transmission, the gears 100 are arranged in the cabin 203, the gears 100 include an input gear 100-1 and an output gear 100-2, the input gear 100-1 is used to connect to the power system 2000 of the helicopter, and the output gear 100-2 is used to connect to the rotor system 3000 of the helicopter.

[0052] The housing 200 is an outer structure that houses and supports the various components of the transmission system. It provides a mounting location and protection for transmission components such as the gears 100, shafts, and bearings. Housing 200 protects the transmission gears 100 from external debris and dust, ensuring stable operation of the transmission system in a relatively clean environment.

[0053] The shape of the housing 200 is designed according to the layout and functional requirements of the transmission system, and there is no limitation on the shape of the housing 200. Some housings 200 are further provided with heat sinks or cooling channels to dissipate the heat generated during the transmission process.

[0054] Gears 40 transmit power and motion through the meshing of their teeth 41. When the teeth 41 of the driving gear push the teeth 41 of the driven gear, power is transferred from the driving gear to the driven gear. By selecting a combination of gears 40 with different numbers of teeth, the speed and torque of the transmission system can be varied. In some transmission systems, gears 40 can change the direction of motion. In more complex transmission systems, gears 40 can distribute power to multiple outputs.

[0055] In the present application, a helicopter composite transmission system 1000 including a plurality of gears 100 is a reduction transmission system between a power system 2000 and a rotor system 3000 .

[0056] At least one gear 100 is a composite gear, comprising: a central support portion 10, which is made of carbon fiber; and a metal ring gear 40, which is connected to the central support portion 10 and coaxially disposed with the central support portion 10. The metal ring gear 40 is provided with circumferentially spaced teeth 41. The central support portion 10 and the metal ring gear 40 are fixedly connected and rotate synchronously.

[0057] That is, in the composite gear of the present application, a complete gear is divided into at least two parts, wherein the ring gear part is made of metal, and the center part of the ring gear is made of carbon fiber.

[0058] Carbon fiber materials possess exceptional strength, with tensile strength several times greater than that of ordinary steel. For example, in aerospace, carbon fiber composites used in aircraft wings are able to withstand enormous aerodynamic loads. Their high modulus properties prevent deformation under load, with elastic moduli ranging from 230 to 500 GPa.

[0059] The density of carbon fiber materials is relatively low, some are between 1.5-2.0g / cm 3 In comparison, the density of steel is about 7.8g / cm 3 , the density of aluminum alloy is about 2.7g / cm 3 This makes carbon fiber materials extremely advantageous in areas where weight is a key concern. For example, in automobile manufacturing, using carbon fiber materials to manufacture body parts can effectively reduce the vehicle's weight, thereby reducing energy consumption and improving the vehicle's acceleration and handling performance.

[0060] Carbon fiber itself is chemically stable and exhibits excellent corrosion resistance in common chemical environments. It can withstand the erosion of chemicals such as acids, alkalis, and salts. For example, in marine environments, ship components or offshore wind turbine blades made of carbon fiber composites can maintain stable performance over time, unlike metal materials that are prone to rust and corrosion, significantly extending their service life.

[0061] Carbon fiber materials maintain excellent performance when subjected to repeated alternating loads. Their high fatigue strength excels in applications requiring long-term dynamic loads. For example, in the manufacture of wind turbine blades, which are subjected to periodic wind loads during their long-term rotation, carbon fiber can withstand millions of cyclic loading cycles without fatigue damage, ensuring the long-term stable operation of wind turbines.

[0062] The thermal expansion coefficient of carbon fiber materials is very small, generally -0.5×10 -6 -1.0×10 -6 / °C. This means that carbon fiber materials experience minimal dimensional change when exposed to temperature fluctuations. The use of carbon fiber in high-precision optical instruments and electronic equipment ensures accuracy and stability across varying temperatures. For example, in the manufacture of space telescope mounts, carbon fiber mounts can maintain the relative position accuracy of optical components despite the drastic temperature fluctuations in the space environment.

[0063] Some carbon fibers possess certain electrical conductivity and electromagnetic shielding properties. This makes carbon fiber materials uniquely suited for applications in electronic equipment and environments with stringent electromagnetic compatibility requirements. For example, in the manufacture of housings for some electronic instruments, carbon fiber materials can effectively shield against external electromagnetic interference while also preventing leakage of internal electromagnetic signals.

[0064] By using a lightweight composite gear as the transmission gear 100 for the helicopter composite transmission system 1000, the gear 100 can transmit power more efficiently, thereby reducing energy loss. Furthermore, by reducing the weight and inertia of the gear 100, the response speed of the rotor system 3000 can be increased, allowing the rotor blades to reach the required rotational speed more quickly, thereby improving the helicopter's maneuverability and efficiency.

[0065] In summary, the use of composite gears in a helicopter's critical transmission components can reduce the weight of the entire helicopter. This significantly improves the helicopter's fuel efficiency and endurance. Furthermore, the high strength of the composite gears ensures reliability under high-torque transmission conditions, reducing maintenance frequency and costs, and improving the helicopter's overall reliability. Furthermore, the high hardness and wear resistance of the metal ring gear 40 ensure that the composite gears maintain excellent performance even under high-torque conditions, thereby extending the service life of the helicopter composite transmission system 1000 and the entire helicopter.

[0066] In the embodiments of the present application, the type of helicopter used is not limited, and can be a single-rotor helicopter with a tail rotor or a twin-rotor helicopter. Among the twin-rotor helicopters, they can be a tandem twin-rotor helicopter, a transverse twin-rotor helicopter, a coaxial twin-rotor helicopter, etc.

[0067] In the present application, when the axial support portion 10 is made of carbon fiber, it can have various structural forms.

[0068] For example, in some embodiments, Figure 4 As shown, the carbon fiber part is a multi-layer cloth structure. In other embodiments, the carbon fiber part is a monolithic structure, such as a carbon fiber 3D printed part.

[0069] In some specific embodiments, Figure 4 As shown, the axial support part 10 includes multiple layers of carbon fiber prepreg cloth 101, and also includes an epoxy resin structural adhesive film 102 bonded between two adjacent layers of carbon fiber prepreg cloth 101. The axial support part 10 is formed by molding and curing the multiple layers of carbon fiber prepreg cloth 101 and the multiple layers of epoxy resin structural adhesive film 102.

[0070] This type of axial support 10 fully leverages the performance advantages of continuous fiber-reinforced composite materials and traditional high-performance metal materials, complementing the advantages of composite and metal materials. This reduces the weight of gear 100 and improves the performance of gear 100. Widespread adoption of the helicopter composite transmission system 1000 of this invention could reduce the weight of the entire helicopter by over 10% while maintaining comparable performance and cost. This represents an effective technical solution to the performance improvement and lightweight design challenges faced by traditional helicopter transmission systems.

[0071] To facilitate understanding, the structure of the carbon fiber material portion of a composite gear in a specific embodiment is provided herein.

[0072] The axial support portion 10 includes multiple layers of carbon fiber prepreg 101 arranged in sequence along the axial direction of the axial support portion 10. The multiple layers of carbon fiber prepreg 101 are laid at alternating angles of 0° / 90° and ±45°. A layer of epoxy resin structural adhesive film 102 is laid between each two adjacent layers of carbon fiber prepreg 101. After the layers are laid, they are molded and cured.

[0073] In some specific embodiments, each layer of carbon fiber prepreg 101 is a T700-3K plain weave reinforced fiber layer. Specifically, the material used can be T700-3K plain weave reinforced fiber from Tianjin Anglin Maofeng High-tech Materials Co., Ltd. The epoxy resin structural adhesive film 102 can be HX-F168 from Shanghai Hongsi New Materials Technology Co., Ltd.

[0074] Here, T700 is a carbon fiber model. The "T" in T700 represents the tensile strength classification of the carbon fiber, and the number "700" indicates a tensile strength of approximately 700 MPa. T700 fiber cloth has high strength and can withstand significant tensile forces. It also has a high modulus, meaning it resists deformation under stress.

[0075] In the field of fiber fabrics like carbon fiber cloth, "K" is a unit that represents the number of individual filaments in a fiber bundle. "3K" means that a single bundle of fibers in this fiber cloth is composed of 3,000 individual filaments. For example, during the production process of carbon fiber cloth, these individual filaments are bundled together to form a fiber bundle with specific properties.

[0076] Each layer of carbon fiber prepreg 101 has a thickness ranging from 0.127mm to 0.305mm, a tensile strength ranging from 4700MPa to 5100MPa, and a tensile modulus ranging from 220GPa to 240GPa. The epoxy resin structural adhesive film 102 has a thickness ranging from 0.127mm to 0.254mm, and a shear strength ranging from 30MPa to 40MPa. The carbon fiber prepreg 101 comprises at least 30 layers. The resulting axial support portion 10 has a torsional strength ranging from 100MPa to 150MPa and a flexural strength ranging from 170MPa to 220MPa.

[0077] Specifically, if Figure 5 As shown, the axial support portion 10 is a one-piece tubular body. For example, the axial support portion 10 is a tubular body with a wall thickness of at least 6 mm, and the ratio of the axial length to the outer diameter of the axial support portion 10 ranges from 5 to 15. Compared to a solid shaft, the tubular structure of the axial support portion 10 is lighter while maintaining the same strength and stiffness (ability to resist deformation).

[0078] In other specific embodiments, Figure 6As shown, the outer periphery of the axial support portion 10 is provided with an integrally formed first web 13-1. The metal ring gear 40 is connected to one axial side of the first web 13-1 via a first fastener 51. As part of the axial support portion 10 of the composite gear, the first web 13-1 provides structural support and a path for torque transmission. When the first web 13-1 is provided, the metal ring gear 40 can be a face gear.

[0079] In other embodiments, Figure 7-12 As shown, the entire axial support portion 10 is a second web 13-2, which has a center hole in its center. The composite gear also includes a hub 15, which fits into the center hole. Hub 15 is a metal component. This metal component, along with the metal ring gear 40, enhances torque transmission reliability and makes the composite gear less susceptible to breakage or cracking.

[0080] Specifically, if Figure 8 and Figure 11 As shown, the second web 13 - 2 includes at least two layers of sub-plates 130 stacked along the axial direction, and each layer of sub-plates 130 is an integrally formed carbon fiber plate.

[0081] In this way, after the second web 13-2 is layered, the thickness of the single-layer sub-plate 130 is reduced, which facilitates the installation and connection with the hub 15 and the metal ring gear 40, and facilitates the physical connection of the second web 13-2 to the hub 15 and the metal ring gear 40. Here, each layer of sub-plate 130 is molded integrally from a continuous fiber reinforced composite material.

[0082] For example, each sub-plate 130 includes multiple layers of carbon fiber prepreg 101 distributed sequentially along the thickness direction. The layup angles of the multiple layers of carbon fiber prepreg 101 are alternately 0° / 90° and ±45°. A layer of epoxy resin structural adhesive film is laid between each two adjacent layers of carbon fiber prepreg 101, and after the layup is completed, the layers are molded and cured. The thickness of each layer of carbon fiber prepreg 101 ranges from 0.127mm to 0.305mm, the tensile strength ranges from 4700MPa to 5100MPa, and the tensile modulus ranges from 220GPa to 240GPa. The thickness of the epoxy resin structural adhesive film ranges from 0.127mm to 0.254mm, and the shear strength ranges from 30MPa to 40Mpa.

[0083] Furthermore, the thickness of each layer of sub-boards 130 is equal, so during processing, the board body can be processed according to one thickness, and then cut into corresponding shapes according to the requirements of each layer of sub-boards 130, which can reduce costs.

[0084] Furthermore, the multiple layers of sub-plates 130 are processed and stacked axially and connected between the hub 15 and the metal gear ring 40 . The composite gear further includes a second fastener 52 that penetrates and connects at least two layers of sub-plates 130 .

[0085] The second fastener 52 is used to ensure a firm connection between the second web 13 - 2 and the metal gear ring 40 to prevent relative displacement or loosening during high torque transmission.

[0086] Optionally, the second fastener 52 may be a rivet, or other types of connecting members, such as a screw, a pin, etc.

[0087] In some other embodiments, Figure 10-12 As shown, each layer of sub-plate 130 is an integral 3D printed plate, and the multiple layers of sub-plate 130 are sequentially printed and arranged along the axial direction. The wheel hub 15 and the metal gear ring 40 are connected to the sub-plate 130 by curing.

[0088] Specifically, each layer of the sub-board 130 has periodic hollow holes, and all layers of the sub-board 130 are formed by printing layer by layer. Figure 12 The figure shows triangular hollow holes, and the entire sub-board 130 is covered with hollow holes and arranged regularly. The periodicity here means that the hollow holes are arranged regularly, and the arrangement regularity is not limited.

[0089] Optionally, the thickness of each layer of sub-plates 130 is at least 6 mm. This arrangement reduces the thickness of a single layer of sub-plates 130 after the second webs 13-2 are layered. Each time a sub-plate 130 is printed, it is connected to the hub 15 and the ring gear 40, strengthening the connection strength between the second webs 13-2, the hub 15, and the ring gear 40.

[0090] In some embodiments, as Figure 7-12 As shown, an integral flange 44 is provided on the inner circumference of the metal gear ring 40. The second web 13-2 comprises a first sub-plate 1301, a second sub-plate 1302, and a third sub-plate 1303. The first sub-plate 1301 is located on one axial side of the flange 44. The second sub-plate 1302 is located within the space enclosed by the flange 44. The third sub-plate 1303 is located on the other axial side of the flange 44.

[0091] The flange 44 is sandwiched between the first sub-plate 1301 and the third sub-plate 1303, and the first sub-plate 1301 is connected to at least the third sub-plate 1303. This arrangement, with the flange 44 sandwiched between the first sub-plate 1301 and the third sub-plate 1303, increases the contact area between the second web 13-2 and the metal gear ring 40 and strictly limits their position in the axial, circumferential, and radial directions, thereby improving the structural strength and rigidity of the connection and reducing the chance of disengagement.

[0092] The inner circumference of the flange 44 is a non-cylindrical surface. The outer circumference of the second sub-plate 1302 is consistent with the inner circumference of the flange 44 and is in contact with the inner circumference of the flange 44.

[0093] In some embodiments, the metal gear ring 40 is fixed to the axial support portion 10 by gluing.

[0094] On the one hand, the adhesive connection strengthens the connection between the metal ring gear 40 and the axial support portion 10. The adhesive fills tiny gaps and eliminates potential looseness, thereby improving the reliability of the composite gear. Especially under high-torque transmission and vibration conditions, the adhesive connection prevents relative displacement or loosening between the metal ring gear 40 and the axial support portion 10, thus improving the connection strength.

[0095] On the other hand, adhesive bonding can help even out stress distribution. Since the adhesive can fill any irregularities that may occur on the contact surface, the stress is distributed more evenly on the contact surface, thereby reducing local stress concentration.

[0096] Furthermore, adhesive connections can also provide a certain sealing effect, preventing external impurities from entering between the contact surfaces, protecting the internal structure from contamination, and further extending the service life of the composite gear.

[0097] In summary, the present invention overcomes the deficiencies in the prior art, provides a helicopter composite transmission system 1000, gives a design method and design scheme for the helicopter composite transmission system 1000, and solves the performance improvement and lightweight design problems of the traditional helicopter transmission system 1000.

[0098] Throughout this specification, references to terms such as "embodiment" and "example" indicate 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, schematic representations of these terms do 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.

[0099] 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 helicopter composite transmission system, characterized in that: include: A housing (200), wherein a housing (203) is defined within the housing (200); Gears (100), the gears (100) being at least two and connected in sequence for power transmission, the gears (100) being arranged in the cabin (203), the gears (100) comprising an input gear (100-1) and an output gear (100-2), the input gear (100-1) being used to connect to a power system (2000) of a helicopter, and the output gear (100-2) being used to connect to a rotor system (3000) of a helicopter; Wherein, at least one of the gears (100) is a composite gear, and the composite gear comprises: An axial support portion (10), wherein the axial support portion (10) is a carbon fiber member; a metal gear ring (40), the metal gear ring (40) being connected to the axial support portion (10), the metal gear ring (40) being coaxially arranged with the axial support portion (10), and the metal gear ring (40) being provided with gear teeth (41) distributed at intervals along the circumferential direction; The axial support portion (10) is fixedly connected to the metal gear ring (40) and rotates synchronously.

2. The helicopter composite transmission system according to claim 1, characterized in that: The axial support portion (10) includes multiple layers of carbon fiber prepreg (101), and also includes an epoxy resin structural adhesive film (102) bonded between two adjacent layers of the carbon fiber prepreg (101), and the axial support portion (100) is formed by molding and curing the multiple layers of the carbon fiber prepreg (101) and the multiple layers of the epoxy resin structural adhesive film (102); Alternatively, the axial support portion (10) is a carbon fiber 3D printed part.

3. The helicopter composite transmission system according to claim 1, characterized in that: The axial support portion (10) is an integrated tubular body.

4. The helicopter composite transmission system according to claim 3, characterized in that: An integrally formed first web (13-1) is provided on the outer periphery of the axial support portion (10), and the metal gear ring (40) is connected to one axial side of the first web (13-1) via a first fastener (51).

5. The helicopter composite transmission system according to claim 1, characterized in that: The axial support portion (10) is entirely a second web (13-2), and the center of the second web (13-2) has a center hole; The composite gear further comprises a hub (15), the hub (15) being fitted in the center hole, and the hub (15) being a metal part.

6. The helicopter composite transmission system according to claim 5, characterized in that: The second web (13-2) comprises at least two layers of sub-plates (130) stacked in an axial direction, and each layer of the sub-plates (130) is an integrally formed carbon fiber plate.

7. The helicopter composite transmission system according to claim 6, characterized in that: Each layer of the sub-plates (130) has an equal thickness. The multiple layers of the sub-plates (130) are stacked axially after being processed and connected between the wheel hub (15) and the metal gear ring (40). The composite gear further comprises a second fastener (52) that penetrates and connects at least two layers of the sub-plates (130).

8. The helicopter composite transmission system according to claim 6, characterized in that: Each layer of the sub-plate (130) is an integrated 3D printed molding plate, and the multiple layers of the sub-plate (130) are printed and arranged in sequence along the axial direction; The wheel hub (15) and the metal gear ring (40) are connected to the sub-plate (130) by solidifying the sub-plate (130).

9. The helicopter composite transmission system according to any one of claims 5 to 8, characterized in that: An integral flange (44) is provided on the inner circumferential surface of the metal gear ring (40); The second web (13-2) includes: a first sub-plate (1301), the first sub-plate (1301) being located on one axial side of the flange (44); a second sub-plate (1302), the second sub-plate (1302) being located in a space enclosed by the flange (44); a third sub-plate (1303), the third sub-plate (1303) being located on the other axial side of the flange (44); The flange (44) is sandwiched between the first sub-plate (1301) and the third sub-plate (1303), and the first sub-plate (1301) is connected to the third sub-plate (1303).

10. The helicopter composite transmission system according to any one of claims 1 to 8, characterized in that: The metal gear ring (40) is fixedly connected to the axial support portion (10) by gluing.

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