Transmission mechanism of coaxial reverse-propeller dual-rotor unmanned helicopter

Abstract

The utility model discloses a transmission mechanism of a coaxial reverse-propeller double-rotor unmanned helicopter. The transmission mechanism comprises a base, a driving shaft assembly, a gap bridge shaft assembly, an upper propeller rotating shaft assembly and a lower propeller rotating shaft assembly, the driving shaft assembly comprises a motor, and the motor is connected to the base; the gap bridge shaft assembly comprises a gap bridge shaft which is rotationally connected to the machine base, and the motor is in driving connection to the gap bridge shaft. The lower paddle rotating shaft assembly comprises a hollow shaft which is rotationally connected to the machine base, and the motor is in driving connection to the hollow shaft. The upper paddle rotating shaft assembly comprises a center shaft which is rotationally connected to the hollow shaft and the machine base, and the gap bridge shaft is in driving connection to the center shaft. Compared with the prior art, the single motor is adopted for driving, and compared with double motors, the energy consumption is reduced; a bevel gear is adopted to replace a traditional bevel gear for transmission, the space size is smaller, and the transmission efficiency is improved; the transmission mode layout is compact, the structure is reasonable, and the cruising ability and the flight performance of the unmanned aerial vehicle are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to unmanned helicopter technical field especially relates to a transmission mechanism of coaxial counter -rotating rotor dual rotor unmanned helicopter. BACKGROUND

[0002] ‌The load principle of the coaxial counter -rotated rotor dual rotor unmanned helicopter is mainly based on its unique dual rotor design and flight control mechanism, and the upper and lower rotors of the coaxial counter -rotated rotor dual rotor unmanned helicopter rotate around the same theoretical axis in positive and negative directions. This design makes the torque generated by the two rotors balanced in the flight state of the same direction, thereby reducing the tail rotor required by the traditional single rotor helicopter. The coaxial dual rotor unmanned helicopter has certain advantages in urban fire fighting, power inspection, aerial photography, logistics transportation, disaster rescue, agricultural plant protection and other fields compared with other unmanned aerial vehicles due to its compact structure, high hovering precision, good flight performance in complex weather conditions and large lift.

[0003] The traditional coaxial dual rotor unmanned aerial vehicle adopts bevel gears to realize the reverse rotation of the upper and lower blades, but has the disadvantages of large volume and weight, large efficiency loss and the like. The structure of adopting double motors to drive the upper and lower blades increases the system weight and energy consumption and has the problem of power synchronization of the two motors. If the synchronization deviation occurs, the unmanned aerial vehicle will lose control, and therefore a high-precision control system is required, increasing the complexity and cost. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a transmission mechanism of coaxial counter -rotated rotor dual rotor unmanned helicopter, which realizes the reverse and synchronous rotation of the upper and lower blades by adopting the driving mode of single motor, improves the transmission efficiency, optimizes the layout to make the structure more compact, reduces the system weight and volume, improves the endurance and flight performance, and solves the problems in the above background technology.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] A transmission mechanism of coaxial counter -rotated rotor dual rotor unmanned helicopter, including machine seat, drive shaft subassembly, bridge shaft subassembly, upper paddle pivot subassembly and lower paddle pivot subassembly, drive shaft subassembly is connected to including motor, and the motor is connected to the base, and the bridge shaft subassembly includes bridge shaft, and the bridge shaft is rotatably connected to the machine seat, and the motor drive is connected to the bridge shaft, and the lower paddle pivot subassembly includes hollow shaft, and the hollow shaft is rotatably connected to the machine seat, and the motor drive is connected to the hollow shaft, and the upper paddle pivot subassembly includes central shaft, and the central shaft is rotatably connected to the hollow shaft and the machine seat, and the bridge shaft drive is connected to the central shaft.

[0007] The further improved scheme of the utility model is that the machine seat includes the frame structure that is connected by mounting disc, bottom plate, front and rear baffle, left and right baffle, and bearing seat A is fixedly connected to the mounting disc.

[0008] The further improved scheme of the utility model is that the motor is connected to the mounting disc, the power output shaft of the motor is connected with a driving gear shaft, the driving gear shaft is rotatably connected to the bearing seat B through a bearing, the bearing seat B is connected to the bottom plate, and the driving gear shaft is connected with a lower paddle driving gear and a bridge gear I.

[0009] The further improved scheme of the utility model is that the bridge shaft is rotatably connected to the bearing seat C through a bearing, the bearing seat C is connected to the bottom plate, the bottom end of the bridge shaft is connected with a bridge gear II, and the bridge gear II is engaged with the bridge gear I.

[0010] The further improved scheme of the utility model is that the hollow shaft is connected with a lower paddle driven gear through a gear sleeve I at the lower end, and is fixed with a lower paddle seat at the upper end, and the hollow shaft is installed in the bearing seat A through two bearings; the driving gear shaft is connected with a lower paddle driving gear, and the lower paddle driven gear is engaged with the lower paddle driving gear.

[0011] The further improved scheme of the utility model is that the center shaft is connected with an upper paddle driven gear through a gear sleeve II at the lower end, the top end of the bridge shaft is connected with an upper paddle driving gear, the upper paddle driven gear is engaged with the upper paddle driving gear, the upper end of the center shaft is connected with an upper paddle seat, the upper end of the center shaft is fixed in the lower paddle seat through a bearing, the lower end is rotatably connected to the bearing seat D through a bearing, and the bearing seat D is fixedly connected to the bottom plate.

[0012] The further improved scheme of the utility model is that the lower paddle driving gear, the bridge gear I, the bridge gear II, the lower paddle driven gear, the upper paddle driven gear and the upper paddle driving gear are all helical gears.

[0013] The utility model discloses the beneficial effect:

[0014] The coaxial counter paddle double-rotor unmanned helicopter of the utility model adopts the driving mode of single motor, realizes the reverse and synchronous rotation of upper and lower paddles through helical gear transmission, improves transmission efficiency, optimizes the layout, makes the structure more compact, reduces the weight and volume of the system, improves the endurance capacity and flight performance. DRAWINGS

[0015] Fig. 1 It is the three-dimensional axonometric drawing of the utility model.

[0016] Fig. 2 It is the sectional view of the utility model.

[0017] In the diagram: 1-Base, 101-Mounting plate, 102-Base plate, 103-Front and rear baffles, 104-Left and right baffles, 105-Bearing housing A, 2-Drive shaft assembly, 201-Motor, 202-Drive gear shaft, 203-Lower propeller drive gear, 204-Bridge gear I, 205-Bearing housing B, 3-Bridge shaft assembly, 301-Bridge shaft, 302-Upper propeller drive gear, 303-Bridge gear II, 304-Bearing housing C, 4-Upper propeller shaft assembly, 401-Central shaft, 402-Gear sleeve II, 403-Upper propeller driven gear, 404-Upper propeller housing, 405-Bearing housing D, 5-Lower propeller shaft assembly, 501-Hollow shaft, 502-Gear sleeve I, 503-Lower propeller driven gear, 504-Lower propeller housing. Detailed Implementation

[0018] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0019] Example 1: As Figs. 1-2 As shown, a transmission mechanism for a coaxial counter-rotating dual-rotor unmanned helicopter includes a base 1, a drive shaft assembly 2, a bridge shaft assembly 3, an upper rotor shaft assembly 4, and a lower rotor shaft assembly 5. The base 1 is a frame structure, consisting of a mounting plate 101, a base plate 102, front and rear baffles 103, and left and right baffles 104. The transmission device, bearing seats, and other accessories of the unmanned helicopter are all mounted on the base 1.

[0020] The drive shaft assembly 2 includes a motor 201. The upper end of the motor 201 is fixed on the mounting plate 101, and the lower end is connected to the drive gear shaft 202. The lower end of the drive gear shaft 202 is connected to the base plate 102 through the bearing seat B205. The drive gear shaft 202 is equipped with a lower rotor drive gear 203 and a bridge gear I 204. The drive shaft assembly 2 is the power unit of the unmanned helicopter. The lower rotor drive gear 203 directly outputs torque to the lower rotor shaft assembly 5, and the lower end drives the bridge shaft assembly 3 to rotate through the bridge gear I 204.

[0021] The bridge shaft assembly 3 includes a bridge shaft 301, which is connected to the base plate 102 via a bearing housing C304. The bridge shaft 301 is equipped with an upper propeller drive gear 302 and a bridge gear II 303. The bridge shaft assembly 3 is responsible for transmitting the torque output by the drive shaft assembly 2 to the upper propeller shaft assembly 4 at a constant speed, so that the upper and lower propellers rotate at the same speed but in opposite directions.

[0022] The lower propeller shaft assembly 5 includes a hollow shaft 501. The lower end of the hollow shaft 501 is connected to the driven gear 503 of the lower propeller through a gear sleeve I 502, and the upper end is fixed to the lower propeller seat 504. The hollow shaft 501 is installed in the bearing housing A105 through two bearings. The lower propeller shaft assembly 5 is responsible for transmitting the torque output by the drive shaft assembly 2 to the lower propeller blade. It is a single-stage gear transmission, and the rotation direction is opposite to that of the drive shaft assembly 2.

[0023] The upper paddle rotating shaft assembly 4 comprises a central shaft 401, the lower end of the central shaft 401 is connected with the upper paddle driven gear 403 through a gear sleeve II 402, the upper end is fixed with the upper paddle seat 404, the upper end of the central shaft 401 is fixed in the lower paddle seat 504 through a bearing, and the lower end is fixed with the bottom plate 102 through a bearing seat D 405, the upper paddle rotating shaft assembly 4 is responsible for transmitting the torque of the driving shaft assembly 2 to the upper paddle through the bridge shaft assembly 3, is a two-stage gear transmission, and the rotating direction is the same as that of the driving shaft assembly 2.

[0024] The specific working principle of the utility model is as follows:

[0025] When working, the motor works, the driving gear shaft 202 rotates, the lower paddle driving gear 203 on the driving gear shaft 202 drives the lower paddle driven gear 503 to rotate, the hollow shaft 501 is driven to rotate by the lower paddle driven gear 503, and then the lower paddle rotates and works; at the same time, the bridge gear I 204 on the driving gear shaft 202 drives the bridge gear II 303 on the bridge shaft 301 to rotate, the upper paddle driving gear 302 rotates synchronously, the upper paddle driving gear 302 drives the upper paddle driven gear 403 to rotate, the central shaft 401 rotates, and then the upper paddle and the lower paddle rotate and work synchronously.

[0026] The utility model realizes the reverse and synchronous rotation of the upper and lower paddles through the bevel gear transmission, improves the transmission efficiency, adopts the layout mode that the motor and the gear are radially staggered, effectively reduces the length and width dimensions of the machine box, makes the structure more compact, reduces the system weight and volume, improves the endurance and flight performance.

[0027] In addition, compared with the bevel gear structure, the bevel gear transmission has the advantages of large tooth surface coincidence degree, stable transmission and high bearing capacity, can adopt the engineering plastic (such as polyoxymethylene POM) with self-lubricating performance under the same bearing capacity requirement, can still rotate at high speed and stably under the working condition without adding lubricant, the lubrication system of the reduction gearbox is saved, and the system weight and occupied space are reduced.

[0028] The above embodiment is only for describing the technical concept and characteristics of the utility model, the purpose is to enable the person skilled in the art to understand the content of the utility model and implement it, and cannot limit the protection scope of the utility model. Any equivalent transformation or modification according to the spirit and essence of the utility model should be covered in the protection scope of the utility model.

Claims

1. A transmission mechanism for a coaxial counter-rotating rotor unmanned helicopter, characterized in that: The assembly includes a base (1), a drive shaft assembly (2), a bridge shaft assembly (3), an upper propeller shaft assembly (4), and a lower propeller shaft assembly (5). The drive shaft assembly (2) is connected to a motor (201), which is connected to the base. The bridge shaft assembly (3) includes a bridge shaft (301), which is rotatably connected to the base (1), and the motor (201) is driven to the bridge shaft (301). The lower propeller shaft assembly (5) includes a hollow shaft (501), which is rotatably connected to the base (1), and the motor (201) is driven to the hollow shaft (501). The upper propeller shaft assembly (4) includes a central shaft (401), which is rotatably connected to the hollow shaft (501) and the base (1), and the bridge shaft (301) is driven to the central shaft (401).

2. A transmission mechanism for a coaxial counter-rotating rotor unmanned helicopter according to claim 1, characterized in that: The base (1) includes a frame structure consisting of a mounting plate (101), a base plate (102), front and rear baffles (103), and left and right baffles (104), and a bearing seat A (105) is fixedly connected to the mounting plate (101).

3. A transmission mechanism for a coaxial counter-rotating rotor unmanned helicopter according to claim 2, characterized in that: The motor (201) is connected to the mounting plate (101). The power output shaft of the motor (201) is connected to the drive gear shaft (202). The drive gear shaft (202) is rotatably connected to the bearing seat B (205) through the bearing. The bearing seat B (205) is connected to the base plate (102). The drive gear shaft (202) is connected to the lower propeller drive gear (203) and the bridge gear I (204).

4. A transmission mechanism for a coaxial counter-rotating rotor unmanned helicopter according to claim 3, characterized in that: The bridge shaft (301) is rotatably connected to the bearing seat C (304) via a bearing. The bearing seat C (304) is connected to the base plate (102). The bottom end of the bridge shaft (301) is connected to the bridge gear II (303), which meshes with the bridge gear I (204).

5. A transmission mechanism for a coaxial counter-rotating double rotor unmanned helicopter according to claim 3, characterized in that: The lower end of the hollow shaft (501) is connected to the driven gear (503) of the lower propeller through the gear sleeve I (502), and the upper end is fixed to the lower propeller seat (504). The hollow shaft (501) is installed in the bearing seat A (105) through two bearings. The drive gear shaft (202) is connected to the drive gear (203) of the lower propeller, and the driven gear (503) of the lower propeller meshes with the drive gear (203).

6. A transmission mechanism for a coaxial counter-rotating double rotor unmanned helicopter according to claim 3, characterized in that: The lower end of the central shaft (401) is connected to the driven gear (403) of the upper propeller through the gear sleeve II (402). The top end of the bridge shaft (301) is connected to the driving gear (302) of the upper propeller. The driven gear (403) of the upper propeller meshes with the driving gear (302) of the upper propeller. The upper end of the central shaft (401) is connected to the upper propeller seat (404). The upper end of the central shaft (401) is fixed in the lower propeller seat (504) through the bearing. The lower end is rotatably connected to the bearing seat D (405) through the bearing. The bearing seat D (405) is fixedly connected to the base plate (102).

7. A transmission mechanism for a coaxial counter-rotating double rotor unmanned helicopter according to claim 5 or 6, characterized in that: The lower propeller drive gear (203), bridge gear I (204), bridge gear II (303), lower propeller driven gear (503), upper propeller driven gear (403), and upper propeller drive gear (302) are all helical gears.

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