1.Taiyuan Research Institute Co.，Ltd.，China Coal Science and Technology Group，Taiyuan ，China；2.Shanxi Tiandi Coal Mining Machinery Co.，Ltd.，Taiyuan ，China

In order to solve the auxiliary transportation problem of thin coal seam mining，for the low and narrow working environment with thin coal seam roadway height less than 2.0 m，the material transportation rubber wheel vehicle is designed to have a rated load of 5 tons.The vehicle has a height of less than 1.6 m and a width of less than 1.9 m.It is powered by an explosion-proof diesel engine，with a frontwheel drive，front and rear oil and gas suspension，and two-way driving control.The oscillating articulated frame and the tapered roller bearing are used between the front and rear frames to realize the relative rotation of the front and rear bodies around the horizontal axis to ensure four-wheel landing of vehicle during driving，thereby effectively improving the reliability and safety of vehicle.The key technologies such as overall vehicle design，the determination rated load，the axle load estimation，the design of the drive axle and brake system，operating road surface and operating conditions，the matching design of power transmission system，design of the swing frame and design of the working device are described.The medium-thick coal seam trackless rubber tire vehicle with the above technology has been verified in the Shendong Baode Coal Mine and the Zhongmei Pingshuo Anjialing No.1 coal mine.The tests show that the technical performance of the vehicle fully meets the requirements of production conditions.Research on key technologies，design ideas and methods of low-profile articulated dump rubber wheel vehicles can solve the problems of low body，driving capacity and rapid transportation of thin coal seam self-unloading rubber tire vehicles and accelerate coal mine thin coal seam intelligence.The promotion and use of new mining equipment will effectively reduce the labor intensity of workers and improve the efficiency of coal development and utilization.

中国煤炭科工集团有限公司科技创新创业资金专项资助项目（2018-TD-ZD011）；山西省重点研发计划（指南）资助项目（201803D121121）；山西天地煤机装备有限公司技术创新资助项目（M2019-05）