1. 研究目的与意义（文献综述）

atpresent, with the continuous growth of the market economy and in response tothe call for environmental protection, new energy vehicles are occupying anever-increasing share of the world market. electric trucks, as a naturally partof new energy vehicles, are greatly concerned by various companies.

electrictrucks are economical, with lower charging fees than fuel costs. becauselogistics vehicles value cost economy and require less comfort, electricvehicles are economically superior to ordinary fuel trucks. from the point ofview of car purchase cost, electric logistics vehicles not only enjoy centraland local double subsidies, but also have purchase tax exemption when buyingcars. however, the high original price may lead to higher selling prices thantraditional logistics vehicles, but in general, electric vehicles with lowcharging costs have obvious economic advantages.

accordingto the research report on the current situation of china's electric logisticsvehicle market from 2018 to 2025 published by the china industry researchnetwork, many large cities do not limit the green light of pure electricvehicles, but also give priority to licensing and free parking. compared to those fuel trucks which can onlybe used at night, pure electric trucks can work at anytime and in anywhere, whosecompetitive advantage is obvious. in u.s. and uk, electric trucks are alsobecome more and more popular, as u.s. is building charging sites for electrictrucks^[1] , andelectric trucks are occupying an increasing share of the u.s. market^[2], uk is trying to replace ordinary trucks by electrictrucks for sanitation workers^[3]. above all, we can clearly see the bright future ofelectric trucks.

2. 研究的基本内容与方案

thebasic content of this design is to design the rear wheel brake of the 1070electric truck. i intend to use dongfeng eq1070 ttbev as the design model. themain contents of the design are listed as follows:

1.determinethe type of designed brake；

2.determinethe structure of designed brake；

3. 研究计划与安排

2.26-3.4 brainstorm、documentretrieval、complete opening report

3.5-3.14 internship

3.15-3.25 translation、gather information

4. 参考文献（12篇以上）

[1] 沈苏皖. 美国:为行驶的电动货车充电[j]. 国际城市规划, 2017(1):149-150.

[2] 戴朝典. 美国纯电动卡车和客车的市场正逐步渗透[j]. 汽车与配件, 2015(52).

[3] 宁文祥. 电动卡车离我们有多远——英国环卫工作者试驾塔塔电动轻卡[j]. 专用汽车, 2013(3):56-57.