| Unmanned aerial vehicle (UAV) has attracted worldwide attention with the rapid development of aviation. And Micro UAV has been a hot field, thanks to its unique advantages and extensive applications in military and civil use. The electric steering engine is a core of components which control Micro UAV. Smaller volume, smaller weight and stronger torque output is the development trend of the electric steering engine.This paper focus on developing a gear decelerator, which has many features such as small size, big transmission ratio, stronger torque, high precision, high efficiency and longevity.To design this type of decelerator which can meet these stringent requirements at the same time is very difficult. Several proposed patterns of transmission were analyzed on transmission ratio and efficiency in order to choose an appropriate type. Because of higher transmission ratio and smaller volume, bevel gear transmission combined with 3K(II) type of planetary transmission is chosen as the final solution. This paper also programmed to calculate parameters of gear transmission with Visual Basic.Because of electric steering engine is essentially a servo system, the backlash of decelerator will directly affect stabilization and sensitivity of the servo system. This paper did a detailed analysis of factors that affecting backlash and calculated the backlash by maximum value method and statistical method respectively. Furthermore, Finding out how various factors affect the precision of transmission according to calculations, and controlling the backlash more effectively by reasonable distribution of precision.The structural design of gear decelerator includes the choice of material, technology for processing, calculation of intensity and rigidity. Based on the structural design, establish a virtual prototype decelerator in Pro/E. And interference checking and kinematics simulation of the virtual prototype decelerator will be completed in Mechanism simulation module of the Pro/E. Adjusting the structure of decelerator according to results of interference checking. Through results of kinematics Simulation, verifying calculation of planetary-gear transmission. Using ANSYS software, the main components of gear decelerator were analyzed on strength and modal. Besides, the meshing of the planetary gear vice was analyzed. The result of finite element analysis will be compared with theory in order to optimize the structure of gear decelerator.Finally, based on all of above, determine all of the parameters of decelerator. Complete the design of decelerator with drawing a full set of drawings. |
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