A bevel gear based dual-rotor unmanned helicopter reduction gearbox

Abstract

A kind of bevel gear based on dual-rotor unmanned helicopter reduction gear box, effectively solve the problem of low transmission efficiency and large size of existing gear box;Including gear box, the lower end of gear box is detachably connected with lower end cover, gear box is small at top and big at bottom, gear box is rotatably connected with upper and lower axial rotor main shaft in output bearing, flange is coaxially arranged on rotor main shaft, transmission bevel gear is detachably connected with flange in coaxial, gear box left side is rotatably connected with connecting bevel gear above transmission bevel gear and meshing with transmission bevel gear in transmission bearing, connecting bevel gear is left and right axial and output end extends out gear box;This structure is simple, novel in design, convenient to use, and has strong practicality.

Description

Technical Field

[0001] This utility model relates to the field of aviation technology, and in particular to a reduction gearbox for a dual-rotor unmanned helicopter based on bevel gears. Background Technology

[0002] In the power transmission system of a dual-rotor unmanned helicopter, the gear reducer is a key component, responsible for converting the high-speed rotation of the power source into the low-speed, high-torque required by the rotor. Traditional single-rotor UAV gear reducers typically employ parallel shaft gears or planetary gear structures, which, while compact and highly efficient, are clearly insufficient for dual-rotor systems.

[0003] Due to the complex interactive torque and vibration coupling effects between the two rotors, the gear meshing surfaces of traditional gearboxes are prone to uneven wear, leading to a significant increase in failure rate and severely affecting transmission stability and service life. Furthermore, traditional structures struggle to achieve efficient spatial transmission arrangements, especially in scenarios requiring 90° steering, often relying on multi-stage transmissions or additional steering mechanisms. This not only increases system complexity and weight but also reduces overall transmission efficiency. Therefore, there is an urgent need for a gearbox that can adapt to the dynamic characteristics of a dual-rotor system, possesses high reliability, high efficiency, and a compact structure. Utility Model Content

[0004] In view of the above situation and in order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a reduction gearbox for a dual-rotor unmanned helicopter based on bevel gears, which effectively solves the problems of low transmission efficiency and large size of existing gearboxes.

[0005] The technical solution is as follows: This utility model includes a gearbox, with a lower end cover detachably connected to the lower end of the gearbox. The gearbox is conical with a smaller upper part and a larger lower part. A rotor shaft with vertical axial direction is rotatably connected inside the gearbox via an output bearing. A flange is coaxially provided on the rotor shaft. A transmission bevel gear is coaxially detachably connected to the flange. A connecting bevel gear located above and meshing with the transmission bevel gear is rotatably connected to the left side of the gearbox via a transmission bearing. The connecting bevel gear is axial in the left and right direction and its output end extends out of the gearbox.

[0006] Preferably, the left end of the gearbox is detachably connected to a sealing cover that is rotatably connected to the connecting bevel gear.

[0007] Preferably, the gearbox has a vent bolt on the right end.

[0008] Preferably, the rotor main shaft is provided with a main shaft sleeve that is rotatably connected to the gearbox.

[0009] Preferably, the gearbox is equipped with an oil viewing bolt.

[0010] Preferably, the flange is connected to the transmission bevel gear via a plurality of fixing bolts evenly distributed along the circumference.

[0011] Preferably, the gearbox is provided with a rotating lip seal at its upper end.

[0012] Preferably, the tooth surfaces of the transmission bevel gear and the connecting bevel gear are carburized and quenched to achieve a hardness of HRC58-62.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: the 90° cross transmission of power is achieved through the spiral bevel gear pair, which not only has a compact structure and a highly efficient and direct transmission path with a transmission efficiency of over 95%, but also the unique "8" meshing design of the bevel gear pair can adapt to slight fluctuations in the transmission ratio, effectively absorb the vibration and interactive torque generated by the dual-rotor system, significantly reduce the risk of gear wear, improve transmission stability and reliability, and overall enhance the service life, maintenance convenience, and overall working efficiency of the power transmission system of the dual-rotor unmanned helicopter. Attached Figure Description

[0014] Figure 1 This is the main view axonometric drawing of this utility model.

[0015] Figure 2 This is a full-section main view axonometric drawing of this utility model.

[0016] Figure 3 This is a full-section left-side axonometric drawing of this utility model.

[0017] Figure 4 This is a full-section top-view axonometric drawing of this utility model.

[0018] Figure label: 1. Gearbox; 2. Lower end cover; 3. Output bearing; 4. Rotor main shaft; 5. Flange; 6. Drive bevel gear; 7. Drive bearing; 8. Connecting bevel gear; 9. Sealing cover; 10. Vent bolt; 11. Main shaft sleeve; 12. Oil viewing bolt; 13. Fixing bolt; 14. Rotary lip seal ring. Detailed Implementation

[0019] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the implementations of the base model disclosed below.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0022] Depend on Figures 1 to 4 The gearbox 1 is provided, with a lower end cover 2 detachably connected to its lower end. The gearbox 1 is conical with a smaller top and a larger bottom. A rotor shaft 4 with vertical axial direction is rotatably connected inside the gearbox 1 via an output bearing 3. A flange 5 is coaxially mounted on the rotor shaft 4. A transmission bevel gear 6 is coaxially detachably connected to the flange 5. A connecting bevel gear 8 located above and meshing with the transmission bevel gear 6 is rotatably connected to the left side of the gearbox 1 via a transmission bearing 7. The connecting bevel gear 8 has a horizontal axial direction and its output end extends out of the gearbox 1.

[0023] To facilitate sealing, a sealing cover 9 is detachably connected to the left end of the gearbox 1 and is rotatably connected to the connecting bevel gear 8.

[0024] In order to balance the air pressure inside the gearbox 1, a vent bolt 10 is provided at the right end of the gearbox 1.

[0025] In order to position and support the rotor main shaft 4, the rotor main shaft 4 is provided with a main shaft sleeve 11 that is rotatably connected to the gearbox 1.

[0026] In order to check and monitor the level of lubricating oil in gearbox 1, gearbox 1 is provided with an oil level indicator bolt 12.

[0027] In order to detach and connect the flange 5 to the transmission bevel gear 6, the flange 5 is connected to the transmission bevel gear 6 by a plurality of fixing bolts 13 evenly distributed along the circumference.

[0028] To prevent leakage, the upper end of the gearbox 1 is provided with a rotating lip seal ring 14.

[0029] For ease of use, the tooth surfaces of the transmission bevel gear 6 and the connecting bevel gear 8 are carburized and quenched to achieve a hardness of HRC58-62.

[0030] When using this utility model, before starting the power system of the unmanned helicopter, the lubricating oil level in the gearbox 1 needs to be checked by the oil inspection bolt 12 on the gearbox 1 to ensure that it is within the normal working range. Then, the engine is started, and the power is transmitted into the gearbox 1 through the input end of the connecting bevel gear 8. The power is transmitted to the rotor main shaft 4 in a 90° cross transmission form through the transmission bevel gear 6. During this process, the "8" meshing design of the gear pair can effectively absorb rotor vibration. During operation, the air pressure fluctuations caused by temperature changes inside the gearbox 1 are automatically balanced by the vent bolts 10 to prevent oil leakage or intrusion of external contaminants. At the same time, the rotating lip seal ring 14 and the sealing cover 9 work together to ensure the static and dynamic sealing of each rotating connection. The rotor main shaft 4 is precisely positioned and stably supported in the gearbox 1 through the main shaft sleeve 11. Its top flange 5 is reliably connected to the transmission bevel gear 6 through multiple circumferentially distributed fixing bolts 13. Finally, the power after deceleration and torque increase is transmitted to the dual rotor system to drive the rotor to operate smoothly and efficiently. When maintenance is required, the lower end cover 2 and the sealing cover 9 can be removed for internal inspection and component replacement. The overall process demonstrates that the gearbox 1 has good maintainability and environmental adaptability while ensuring high transmission efficiency and compact structure.

[0031] Compared with existing technologies, the beneficial effects of this utility model are as follows: The 90° cross-transmission of power through a spiral bevel gear pair not only results in a compact structure and a highly efficient and direct transmission path with a transmission efficiency exceeding 95%, but also allows the unique "8"-shaped meshing design of the bevel gear pair to adapt to minute fluctuations in the transmission ratio, effectively absorbing the vibrations and interactive torques generated by the dual-rotor system. This significantly reduces the risk of gear wear, improves transmission stability and reliability, and overall enhances the service life, maintenance convenience, and overall working efficiency of the dual-rotor unmanned helicopter's power transmission system. This structure is simple, innovative, easy to use, and highly practical.

[0032] It should be noted that, depending on the implementation needs, the various components described in the embodiments of this utility model can be split into more components, or two or more components or parts of components can be combined into new components to achieve the purpose of the embodiments of this utility model.

[0033] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A bevel gear based dual rotor unmanned helicopter reduction gearbox comprising a gearbox (1) characterised in that, The gearbox (1) is detachably connected to a lower end cover (2). The gearbox (1) is a cone shape with a smaller upper part and a larger lower part. The gearbox (1) is rotatably connected to the rotor shaft (4) with the upper and lower axes via the output bearing (3). The rotor shaft (4) is coaxially provided with a flange (5). The flange (5) is coaxially detachably connected to the transmission bevel gear (6). The left side of the gearbox (1) is rotatably connected to a connecting bevel gear (8) located above the transmission bevel gear (6) and meshing with the transmission bevel gear (6) via the transmission bearing (7). The connecting bevel gear (8) is rotatably connected with the output end of the gearbox (1) with the left and right axes.

2. A bevel gear based dual rotor unmanned helicopter reduction gearbox as claimed in claim 1 wherein, The gearbox (1) is detachably connected to a sealing cover (9) that is rotatably connected to the connecting bevel gear (8) at its left end.

3. A bevel gear based dual rotor unmanned helicopter reduction gearbox as claimed in claim 1 wherein, The gearbox (1) is provided with a vent bolt (10) on the right end.

4. A bevel gear based dual rotor unmanned helicopter reduction gearbox as claimed in claim 1 wherein, The rotor shaft (4) is provided with a main shaft sleeve (11) that is rotatably connected to the gearbox (1).

5. A reduction gearbox for a dual-rotor unmanned helicopter based on bevel gears according to claim 1, characterized in that, The gearbox (1) is equipped with an oil viewing bolt (12).

6. A bevel gear based dual rotor unmanned helicopter reduction gearbox as claimed in claim 1 wherein, The flange (5) is connected to the transmission bevel gear (6) by a plurality of fixing bolts (13) evenly distributed along the circumference.

7. A bevel gear based dual rotor unmanned helicopter reduction gearbox as claimed in claim 1 wherein, The gearbox (1) is provided with a rotating lip seal (14) at its upper end.

8. A bevel gear based dual rotor unmanned helicopter reduction gearbox as claimed in claim 1 wherein, The tooth surfaces of the transmission bevel gear (6) and the connecting bevel gear (8) are carburized and quenched to achieve a hardness of HRC58-62.

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