A gear reducer for UAV engine

Abstract

The present invention relates to the technical field of engine reducers for unmanned aerial vehicles, and specifically to a gear reducer for unmanned aerial vehicle engines, comprising: a housing assembly, a power output shaft, a toothed transmission connector, and a buffer assembly, wherein a driving gear is arranged in the housing assembly, and the driving gear is connected to the crankshaft output end of the engine; the power output shaft is rotatably arranged in the housing assembly, and a driven gear is rotatably arranged on the power output shaft, and the driven gear is meshed with the driving gear, and one end of the power output shaft is used to connect with a propeller after passing through the housing assembly; the toothed transmission connector is connected to the power output shaft through an axially arranged spline, and the toothed end of the toothed transmission connector is engaged with the end face of the driven gear; the buffer assembly is used to buffer the impact force caused by the speed difference between the crankshaft and the power output shaft during the engine start or shutdown process. The present invention avoids the impact force caused by the speed difference between the crankshaft and the power output shaft, and realizes the reduction transmission.

Description

Technical Field

[0001] The present invention relates to the technical field of engine reducers for unmanned aerial vehicles, and in particular to a gear reducer for an unmanned aerial vehicle engine. Background Art

[0002] The engine crankshaft and propeller power output shaft of the drone are matched in speed and torque is transmitted through a reducer. A gear set is generally set inside the reducer, in which the small gear rotates with the crankshaft, and the large gear meshes with the small gear and transmits the torque to the power output shaft, which drives the propeller to rotate.

[0003] When the engine starts, the crankshaft starts to rotate, and the propeller power output shaft will be driven by the crankshaft to rotate from rest under the action of the transmission mechanism. At this time, there is a speed difference between the power output shaft and the engine crankshaft. If the power output shaft is rigidly connected to the large gear, the large gear and the power output shaft will be subjected to a large impact, which may cause gear damage or other failures. Similarly, when the engine is stopped, since there is also a speed difference between the power output shaft and the engine crankshaft, the rigid connection will also cause impact and damage. Therefore, a buffer device needs to be set between the large gear of the reducer and the power output shaft to achieve smooth starting and stopping.

[0004] At present, most of the buffer devices in the reducer are friction type or steel ball type. The friction buffer usually includes two friction plates, which limit the movement of the mechanical system through the friction between the friction plates to achieve buffering. The friction buffer has a simple structure and low manufacturing cost, but it is prone to wear and may not provide sufficient buffering under high speed or high load conditions. The steel ball buffer uses the rolling of the steel ball in the track to limit the movement of the mechanical system to achieve a buffering effect. The steel ball buffer can provide a stable limiting force, is suitable for high speed and high load conditions, and has a relatively long service life, but its structure is relatively complex, the manufacturing cost is high, and the performance is affected by the manufacturing accuracy of the steel ball and the track, and a high processing accuracy is required to ensure performance.

[0005] Therefore, it is necessary to provide a gear reducer for a UAV engine to solve the above problems. Summary of the invention

[0006] The invention provides a gear reducer for a UAV engine to solve the existing problems.

[0007] The gear reducer for a UAV engine of the present invention adopts the following technical solution, including: A housing assembly, in which a driving gear is disposed, and the driving gear is connected to an output end of a crankshaft of the engine; A power output shaft is rotatably arranged in the housing assembly, and a driven gear is rotatably arranged on the shaft, the driven gear meshes with the driving gear, and one end of the driven gear passes through the housing assembly and is used to connect with the propeller; A tooth-type transmission connector, which is connected to the power output shaft through an axially arranged spline, and its tooth end is engaged with the end face of the driven gear; And a buffer assembly is arranged on the power output shaft on the side of the driven gear away from the spline transmission connector, and is used to buffer the impact force caused by the speed difference between the crankshaft and the power output shaft during the engine starting or stopping process, so that the spline transmission connector and the driven gear are relatively slipped at the fitting point.

[0008] Preferably, the buffer assembly comprises: Two spring seats, wherein the spring seat close to the tooth-type transmission connection piece is sleeved on the power output shaft in the housing assembly, and the spring seat away from the tooth-type transmission connection piece is sleeved and fixed on the power output shaft; And a disc spring is sleeved on the power output shaft between the two spring seats, and the end of the disc spring is connected to the spring seat.

[0009] Preferably, there are two disc springs, the opposite ends of the two disc springs are in contact, and the ends of the disc springs facing away from each other are connected to corresponding spring seats.

[0010] Preferably, the toothed transmission connector comprises: a sleeve, which is key-connected to the power output shaft, and has a plurality of first tooth-shaped teeth at one end thereof facing the driven gear, and the first tooth-shaped teeth mesh with the second tooth-shaped teeth at the end surface of the driven gear.

[0011] Preferably, the housing assembly comprises a front housing and a rear housing, and the inner cavities of the front housing and the rear housing are relatively connected.

[0012] Preferably, an oil drain hole is provided on the rear housing, and an oil drain plug is provided on the oil drain hole.

[0013] Preferably, a vent hole is provided on the front shell body, and a vent nozzle is provided in the vent hole.

[0014] Preferably, the power output shaft is connected to the mounting holes on the front housing and the rear housing respectively through bearings.

[0015] Preferably, one end of the power output shaft extending out of the housing assembly is provided with a flange for connecting to a propeller.

[0016] Preferably, the reducer is made of magnesium alloy material.

[0017] The beneficial effects of the present invention are: 1. By providing a toothed transmission connector and an elastic component, and the toothed transmission connector is engaged with the end face of the driven gear, relative sliding occurs at the engagement point between the toothed transmission connector and the end face of the driven gear during the engine starting or stopping process, thereby effectively alleviating the impact caused by the speed difference between the crankshaft and the power output shaft.

[0018] 2. The elastic component of the present invention adopts a disc spring, which can ensure that when the engine is in normal working condition, the tooth-type transmission connecting part and the end face of the driven gear are tightly engaged through the tooth-shaped teeth, thereby realizing the reduction transmission between the crankshaft of the engine and the power output shaft of the reducer. Secondly, the present invention has a simple structure, can withstand large torque and impact loads, and adopts magnesium alloy materials to meet the lightweight design requirements of the UAV system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 An exploded view of a gear reducer for a UAV engine according to the present invention; Figure 2 The present invention is an assembly diagram of a gear reducer for a UAV engine.

[0021] In the figure: 1. rear housing; 2. drain plug; 3. driving gear; 4. driven gear; 5. toothed transmission connector; 6. spring seat; 7. disc spring; 8. front housing; 9. vent nozzle; 10. power output shaft; 11. bearing. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] An embodiment of a gear reducer for a drone engine of the present invention is as follows: Figure 1As shown, it includes: a housing assembly, a power output shaft 10, a toothed transmission connector and a buffer assembly, wherein a driving gear 3 is arranged in the housing assembly, and the driving gear 3 is connected to the crankshaft output end of the engine; the power output shaft 10 is rotatably arranged in the housing assembly, and a driven gear 4 is rotatably arranged on the power output shaft 10, and the driven gear 4 is meshed with the driving gear 3, and one end of the power output shaft 10 is used to connect with the propeller after passing through the housing assembly; the toothed transmission connector is connected to the power output shaft 10 through an axially arranged spline, and the tooth end of the toothed transmission connector is engaged with the end face of the driven gear 4; the buffer assembly is arranged on the power output shaft 10 on the side of the driven gear 4 away from the toothed transmission connector, and is used to buffer the impact force caused by the speed difference between the crankshaft and the power output shaft 10 during the start or stop of the engine, so that the toothed transmission connector and the driven gear 4 are relatively slid at the engagement point, wherein the diameter of the driving gear 3 is smaller than the diameter of the driven gear 4.

[0024] like Figure 1 As shown, the buffer assembly includes: two spring seats 6 and two disc springs 7. The spring seat 6 close to the tooth-type transmission connecting member 5 of the two spring seats 6 is slidably mounted on the power output shaft 10 in the housing assembly, and the spring seat 6 away from the tooth-type transmission connecting member 5 is fixedly mounted on the power output shaft 10; the opposite ends of the two disc springs 7 are in contact, and the opposite ends of the disc springs 7 are connected to the corresponding spring seats 6.

[0025] Specifically, the toothed transmission connection comprises: a sleeve, the sleeve is key-connected to the power output shaft 10, a plurality of first tooth-shaped teeth are arranged at one end of the sleeve facing the driven gear 4, and the first tooth-shaped teeth are meshed with the second tooth-shaped teeth arranged at the end surface of the driven gear 4. Specifically, the housing assembly includes a front housing 8 and a rear housing 1, the inner cavities of the front housing 8 and the rear housing 1 are relatively connected, an oil drain hole is provided on the rear housing 1, an oil drain plug 2 is provided on the oil drain hole, and a vent hole is provided on the front housing 8, and a vent nozzle 9 is provided in the vent hole. Among them, two bearings 11 are provided on the power output shaft 10, and the two bearings 11 are correspondingly connected to the mounting holes on the front housing 8 and the rear housing 1. It should be noted that lubricating oil is stored at the bottom of the housing assembly, and the driving gear 3 is partially immersed in the lubricating oil for oil bath lubrication; during the rotation of the driving gear 3, the lubricating oil at the bottom of the rear housing 1 is rolled up, resulting in splashing of lubricating oil, thereby lubricating the driven gear 4, so the driven gear 4 is splashed and lubricated. During the transmission process of the driving gear 3 and the driven gear 4, the friction generates heat, causing the lubricating oil to gasify, resulting in an increase in the internal air pressure of the housing assembly, and the internal and external pressures of the housing assembly can be balanced through the vent nozzle 9. The oil drain plug 2 is used to seal the lubricating oil to prevent oil leakage, and the oil can be drained by pulling out the oil drain plug 2. In this embodiment, the drain plug 2 is fixedly connected to the front housing 8 via a fuse to prevent the drain plug 2 from falling off and causing oil leakage under normal working conditions.

[0026] Specifically, one end of the power output shaft 10 extending out of the housing assembly is provided with a flange for connecting to a propeller.

[0027] Specifically, the reducer is made of magnesium alloy material.

[0028] Specific working principle When in use, the transmission of the driving gear 3 and the driven gear 4 reduces the speed of the propeller power output shaft 10 and increases the torque, thereby reducing the propeller noise and improving the efficiency. The driving gear 3 is meshed with the output end of the engine crankshaft through the spline and is driven by the crankshaft to rotate. The driving gear 3 and the driven gear 4 are meshed to transmit the torque to the driven gear 4. The driven gear 4 transmits the torque to the toothed transmission connector 5 through the toothed tooth engagement. The toothed transmission connector 5 is meshed with the power output shaft 10 through the spline to drive the power output shaft 10 to rotate. When the engine is in normal working state, the toothed teeth of the toothed transmission connector 5 are meshed with the toothed teeth of the driven gear 4 under the elastic force of the elastic component, that is, the toothed teeth of the toothed transmission connector 5 are tightly engaged with the tooth grooves between two adjacent toothed teeth of the driven gear 4 under the elastic force provided by the disc spring 7 of the elastic component. During the process of starting or stopping the engine, the toothed teeth of the toothed transmission connector 5 and the toothed teeth bevel of the driven gear 4 slide relative to each other to relieve the impact caused by the speed difference between the engine crankshaft and the power output shaft 10, so as to achieve smooth starting and stopping of the engine. After the buffering process is completed, under the elastic force of the disc spring 7, the toothed transmission connector 5 is again tightly engaged with the driven gear 4 through the toothed teeth, thereby achieving the reduction transmission between the engine crankshaft and the power output shaft of the reducer.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A gear reducer for a drone engine, characterized in that: include: A housing assembly, in which a driving gear is disposed, and the driving gear is connected to an output end of a crankshaft of the engine; A power output shaft is rotatably arranged in the housing assembly, and a driven gear is rotatably arranged on the shaft, the driven gear meshes with the driving gear, and one end of the driven gear passes through the housing assembly and is used to connect with the propeller; A toothed transmission connector, which is connected to the power output shaft via an axially arranged spline, and one end of which is engaged with the end face of the driven gear via a tooth-shaped tooth; And a buffer assembly is arranged on the power output shaft on the side of the driven gear away from the spline transmission connector, and is used to buffer the impact force caused by the speed difference between the crankshaft and the power output shaft during the engine starting or stopping process, so that the spline transmission connector and the driven gear are relatively slipped at the fitting point.

2. The gear reducer for a drone engine according to claim 1, characterized in that: The buffer components include: Two spring seats, wherein the spring seat close to the tooth-type transmission connection piece is slidably sleeved on the power output shaft in the housing assembly, and the spring seat away from the tooth-type transmission connection piece is sleeved and fixed on the power output shaft; And a disc spring is sleeved on the power output shaft between the two spring seats, and the end of the disc spring is connected to the spring seat.

3. The gear reducer for a drone engine according to claim 1, characterized in that: There are two disc springs, the opposite ends of the two disc springs are in contact, and the opposite ends of the disc springs are connected to corresponding spring seats.

4. The gear reducer for a drone engine according to claim 1, characterized in that: The toothed transmission connector comprises: a sleeve, which is key-connected to the power output shaft, and one end of the sleeve facing the driven gear is provided with a plurality of first tooth-shaped teeth, and the first tooth-shaped teeth mesh with the second tooth-shaped teeth provided on the end surface of the driven gear.

5. The gear reducer for a drone engine according to claim 1, characterized in that: The housing assembly comprises a front housing and a rear housing, and the inner cavities of the front housing and the rear housing are relatively connected.

6. The gear reducer for a drone engine according to claim 5, characterized in that: An oil drain hole is arranged on the rear housing, and an oil drain screw plug is arranged on the oil drain hole.

7. The gear reducer for a drone engine according to claim 5, characterized in that: A vent hole is arranged on the front shell body, and a vent nozzle is arranged in the vent hole.

8. The gear reducer for a drone engine according to claim 5, characterized in that: The power output shaft is connected to the mounting holes on the front housing and the rear housing respectively through bearings.

9. The gear reducer for a drone engine according to claim 1, characterized in that: One end of the power output shaft extending out of the housing assembly is provided with a flange for connecting to a propeller.

10. The gear reducer for a drone engine according to claim 1, characterized in that: The reducer is made of magnesium alloy.

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