关键词: 丘陵山地拖拉机, 仿形调平机构, 稳定性, 越障性能

Abstract:  In order to solve the problems of poor adaptability,  easy tipping,  and low trafficability performance of existing hilly tractors,  the 504type hilly tractor with an automatic leveling mechanism was designed. The hilly tractor adopted mechanical drive,  a fourwheeldrive walking system,  independent steering systems on both sides,  and a parallel fourbar automatic leveling mechanism,  which could realize the tractor posture automatic profile leveling. Threedimensional modeling of the tractor was carried out based on SolidWorks. ADAMS software was used to model the virtual prototype and analyze the dynamic simulation of roll stability. The results showed that: the leveling action range of the automatic leveling mechanism was 732 mm,  which can ensure the horizontal level of the vehicle body on the slope of 25°. The limit tilt angle of uphill and downhill were both 45°. The longitudinal slip angle of uphill and downhill was 33.69° and 16°,  respectively. The obstacleclimbing height of its front and rear driving wheels was 214 mm. The maximum roll angle of the vehicle body in the leveled state was 37.5°,  which was close to the theoretical calculation of 35.93°. Both the front and rear drive axles of the 504type hilly tractor could be leveled independently and always keep the tractor body in a horizontal position,  which could meet the requirements of hilly and mountain production.

Key words: hilly tractor, profiling and leveling mechanism, stability, obstaclesurmounting performance