Authors

Abstract

With the development of engine supercharging technology and the application of in-cylinder direct injection technology, engines with high power and torque have become a trend. Crankshaft, as one of the most important and expensive parts in tractor engine, plays the role of transforming linear motion into circular rotation. The damage and destruction of crankshaft will lead to the damage of other parts of the engine, which makes the engine unable to work normally, and its stability affects the reliability of the whole engine to a great extent. The main failure form of tractor engine crankshaft is bending fatigue failure, so alternating bending stress occurs in crankshaft, which may cause fatigue failure of crankshaft. Crankshaft is one of the important components of tractor engine, and its stress is complex, which is the key and difficult point of engine design. In this paper, the crankshaft of tractor engine is analysed and studied based on compound supercharging technology, so that the dynamic characteristics of the engine are deeply understood, the action law of dynamic working load is mastered, the response analysis and evaluation of the system are carried out, and the optimization method of crankshaft mechanism of agricultural tractor engine is found out.

Abstract in Chinese

随着发动机增压技术的发展和直喷技术的应用，大功率大扭矩发动机已成为一种发展趋势。曲轴作为拖拉机发动机中最重要、最昂贵的零件之一，起着将直线运动转化为圆周运动的作用。曲轴的损坏和破坏会导致发动机其他部件的损坏，使发动机不能正常工作，其稳定性在很大程度上影响到整个发动机的可靠性。拖拉机发动机曲轴的主要失效形式是弯曲疲劳失效，曲轴产生交变弯曲应力，可能导致曲轴疲劳失效。曲轴是拖拉机发动机的重要部件之一，其受力复杂，是发动机设计的重点和难点。本文以复合增压技术为基础，对拖拉机发动机曲轴进行了分析和研究，以便深入了解发动机的动态特性，掌握动态工作载荷的规律，分析和评价系统的响应，并找出了农用拖拉机发动机曲轴机构的优化方法。