Graduation Design (Dissertation) of Wuhan University of Technology

Design of planetary gears transaxle for new energy vehicles

College: International Education College

Specialty amp; Class: Automobile GJ1403

Student name: Cuiyi

Tutor: XingHui Han

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Abstract

With the rapid development of the global economy and continuous improvement of the manufacturing industry, the performance of automobiles has been increasingly perfected, and our lives are increasingly inseparable from the automotive and automotive industries. As a result, the ownership of automobiles continues to increase. Even with breakthroughs in energy-saving and emission-reduction technologies, the serious energy crisis and environmental pollution caused by the consumption of petroleum resources are becoming more and more severe. In order to solve the problems caused by traditional fuel vehicles, a new research direction for new energy vehicles has been formed. Among them, the development of electric vehicles is the most rapid, which can effectively alleviate the problems of energy depletion and environmental pollution, and can basically meet people’s basic production and living needs.

The main purpose of this design is to propose a scheme for the design, modelling and verification of electric bridges based on a miniature van that uses an electric motor instead of an engine (including planetary gears—secondary gear reducers, differentials, axles, and bridges. shell). It should be able to complete the functions of speed change, differential speed and drive wheels under the conditions that should be matched with the other power parts of the car and the overall layout of the vehicle, and the performance of the car should be improved as much as possible. The main difference between the existing drive axle and the existing drive axle is that the planetary gear mechanism is used as the main reducer compared with ordinary fixed-shaft gear reducer. Its remarkable features are: the planetary gear reducer is small in size, light in weight, compact in structure, and high in transmission power. High capacity and high transmission ratio, transmission efficiency, smooth movement, shock resistance and vibration.

The significance of this paper is that in the future when the power battery and motor technology are mature, it is undoubtedly the most direct pollution-free way to change the internal combustion engine drive to pure electric drive. The choice of the structural form and performance parameters of the electric vehicle transaxle at this time will mainly affect the dynamic performance of the car, which is mainly reflected in the vehicle's power, fuel economy and emission performance. Moreover, the use of this system can also make the transmission system compact, which is beneficial to the layout of other systems and the weight reduction of the vehicle chassis, and also reduces the difficulty of research and development of vehicles and the cost.

Key Words：Planetary; transaxle; new energy vehicles.

CONTENT

I Introduction 4

1.1 Research Purpose and Significance 4

1.2 Research Status at Home and Abroad 6

1.3 The main research content of this article 8

II Analysis of Drive Axles of Electric Vehicles 10

2.1 Determination of Transmission Scheme (Layout Scheme) 10

2.1.1 Drive Bridge Design Requirements: 10

2.1.2 Drive Bridge Selection 10

2.2 The choice of motor parameters 11

2.2.1 Selection of Motor Power 12

2.2.2 Selection of final reducer gear ratio 13

III Main Reducer Structure Design 14

3.1 Planetary Gear Design 14