丘陵山地轮式拖拉机车身调平系统设计与物理模型试验  

Design and physical model experiment of body leveling system for roller tractor in hilly and mountainous region

作　　者：彭贺 马文星[1] 赵恩鹏[1] 卢秀泉[1] 冯雪[1] Peng He;Ma Wenxing;Zhao Enpeng;Lu Xiuquan;Feng Xue(College of Mechanical Science and Engineering,Jilin University,Changchun 130022,China;College of Mechanical Engineering,Beihua University,Jilin 132013,China)

机构地区：[1]吉林大学机械科学与工程学院,长春130022 [2]北华大学机械工程学院,吉林132013

出　　处：《农业工程学报》2018年第14期36-44,共9页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家重点研发计划"智能农机装备"专项(2016YFD0700403)

摘　　要：为解决丘陵山地拖拉机在复杂工况下作业时车身难保水平、容易倾翻等问题,该文设计了一种新型拖拉机车身调平系统。基于数字化虚拟样机技术建立了具有该调平系统的丘陵山地拖拉机多体动力学模型,并对其进行了运动学和动力学仿真分析。运动学仿真分析结果表明,山地拖拉机车身调平系统结构能够实现调平运动且工作部件之间不发生干涉现象;通过动力学仿真分析得到车身调平系统中各个油缸以及关键零部件的动态受力和扭矩等关键数据,结果表明各部件受力能够满足强度以及刚度要求,证明了所设计的丘陵山地拖拉机车身调平机构的正确性。设计并搭建了具有调平功能的模型车体试验台,通过试验与仿真对比分析,最大误差为15%,最大平均误差为10.20%,验证了拖拉机车身调平系统仿真方法具有较高的精度,为拖拉机车身调平系统的设计提供了有效的理论支撑。Hilly tractor is difficult to maintain level, and easy to tip over in complex working conditions. In order to solve this problem, promote the rapid development of agricultural mechanization and improve the farmers＇ production conditions in hilly areas of China, a new leveling system of tractor body is proposed relying on ＂intelligent agricultural machinery and equipment＂, the national key research and development plan. Structural design, hydraulic system design, kinematics and dynamics simulation were included in this paper. The leveling system was mainly composed of central transmission assembly, leveling cylinder assembly, steering knuckle assembly, wheel transmission assembly and tyre. The power of the engine was transferred to the cylinder assembly through the central transmission assembly, then the power was transferred to a pair of bevel gear pairs in the steering knuckle assembly by leveling the cylinder, and finally the power was transferred to the wheels through the wheel transmission assembly. The hydraulic system was mainly composed of a gear oil pump, a filter, 4 electromagnetic proportional selector valves and 4 leveling cylinders. To achieve the leveling of the body, it needs to adjust the input flow of the cylinder by controlling the input current of the electromagnetic proportional valve. Three-dimensional（3 D） model was built by CATIA（computer aided three-dimensional interactive application） according to vehicle design parameters. A multi-body dynamics model of a hilly tractor equipped with the leveling system was established using the digital virtual prototype technology, i.e. the automatic dynamic analysis of mechanical systems（ADAMS）, to simulate the kinematics and dynamics. The changing curves between attitude angles（i.e. pitch angle and roll angle） of the vehicle body and displacement, velocity of the leveling hydraulic cylinder rod were analyzed through kinematics simulation. The result shows that the leveling mechanism can achieve leveling movement and there is no int

关 键 词：农业机械 模型 试验 丘陵山地拖拉机 车身调平系统 动力学仿真 

分 类 号：S232.3[农业科学—农业机械化工程]