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哈尔滨工业大学华德应用技术学院毕业设计（论文）AbstractWith speed up the pace of urbanization, the road of the rapid increase of the requirements of environmental protection, resulting in increasing city of high-pressure cleaning car the growing demand. Development with independent intellectual property rights of the high-pressure cleaning cars has become our country city sanitation cause an important task, and to enhance our countrys exclusive design level, drive our country sanitation vehicle independent design development to have the important meaning. With the end of the 2008 Olympic Games, Beijing and some other cities also accelerate the move towards the pace of international metropolis, on city environment quality to have higher demand, therefore, high-pressure cleaning cars as clean city few should be current of the most promising one of specialized automobile varieties. In this paper, through the plenty of investigation, to modify a kind of type chassis as the foundation, rated load quality of 3.5 t sprinkler cars. This paper mainly carried out by high-pressure pump, hydraulic pump and hydraulic cylinder and chassis accessory device consisting of water systems, hydraulic system design. Finally, the modification after completing the high-pressure cleaning car through the necessary performance, fuel efficiency and stability etc., the main vehicle performance of calculation and analysis, the calculation results show that the vehicle performance meet