连杆强度计算方法探讨

本文侧重于探讨连杆强度计算中一些较复杂的问题,包括下列内容: (1)连杆衬套、轴瓦与连杆孔的装配过盈和热过盈的处理方法; (2)考虑连杆螺钉的作用; (3)活塞销、曲柄销对连杆孔的分布作用力的研究; (4)连杆大端结合面受力情况分析; (5)连杆强度计算时工况位置的选取; (6)连杆斜约束的处理方法。 此外,还研究了处理以上某些问题的简易方法。 本文的目的在于探求尽可能逼近实际情况的连杆强度计算所需的各种边界条件及其相应的计算方法,务使其计算结果不仅有定性的而且有定量的价值。

STUDY ON THE STRENGTH CALCULATING METHOD OF CONNECTED ROD

Two difficulties should be overcome to precisely calculate the strength of connecting rod. Firstly, the condition of bearing force and motion of the connecting rod is complex and is a function of time; Secondly, the connecting rod is a composite device and is of complex configuration with different types of joining between the various elements and several modes of fitting between interfaces, chiefly, close fit, slide fit and clearance fit.This present paper gives particular attention to the solution of some of the complicated problems concerning strength of the connecting rod. They are:1. Tight fit and shrink fit between axle sleeve, axle bush and connecting rod hole;2. Pre-tight force of connecting rod screw;3. Distribution of the force acting on connecting rod hole via piston pin and crank pin;4. Analysis of bearing force on the interface of the big end of connecting rod;5. Determination of crank running position for the calculation of the strength of connecting rod;6. Treatment of oblique bind of connecting rod.For the solution of the above problems, simplified calculating methods have also be applied in addition to precise techniques.The objective of this paper is to investigate and study boundary conditions of the forces acting on connecting rod and their binding conditions, and consequently to develop methods for their calculation, which will yield solutions of not only qualitative but also quantitative significance.