Abstract
Mega trends in the global automotive industry are environmentally friendly. As laws and regulations tighten at the government level, the automobile industry is striving to develop a drive system that can operate without using fossil fuels, instead of developing an internal combustion engine using fossil fuels. Environmentally-friendly energy is attracting attention as an alternative to solve the problems of air pollution and fossil fuel depletion. Electricity is attracting the most attention among environmentally-friendly alternative fuels. In addition, research on the development of a high-efficiency and high-reliability advanced electric automobile drive system are actively being carried out. In this study, a two-speed transmission for electric vehicles is developed using environmentally-friendly fuel. The 1st and the 2nd planetary gear modules were integrated, the ring gear and the carrier gear were shared, and the dual disc brake was used to design a mechanism for fixing each sun and shifting gear. Such a structure can improve shift energy efficiency compared to that of conventional transmissions. It was judged that the structure was suitable for an electric car using a limited power supply. Each gear was designed by calculating bending strength and surface durability.
Highlights
The global automotive industry is actively working to reduce weight by downsizing and developing lighter components to increase fuel efficiency and reduce emissions [1,2,3,4,5,6]
Governments around the world are emphasizing ‘fuel efficiency improvement’ and ‘environmentally friendly’, which are key to changes in the future automobile industry, by strengthening environmental regulations to cope with climate change [8,9,10,11]
In order to make a compact transmission for an electric vehicle, the interior of the planetary gear unit was designed not to be in a separated parallel structure but in an integrated serial structure
Summary
The global automotive industry is actively working to reduce weight by downsizing and developing lighter components to increase fuel efficiency and reduce emissions [1,2,3,4,5,6]. If the weight of a vehicle is reduced by 10%, fuel efficiency is improved by about 3 to 8%, acceleration performance (0~100 Km reach time) is improved by 8%, and the emission of environmental pollutants is reduced (carbon monoxide 4.5%, NOx 8.8%, hydrocarbons 2.5%). The usual electric vehicle uses a reducer It does not matter when the load is small, such as flat running, but it is stable to use the transmission to control the motor output when the load is large, such as when going up a hill. There is a need for a transmission that is adaptable to various driving environments and that optimizes torque and speed according to the driving speed [12]
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