电液伺服阀衔铁组件过盈配合参数设计

电液伺服阀是航空航天精密电液伺服系统的重要控制元件，其中衔铁组件是负责伺服阀电液转换的关键部件。为保证姿态控制信号的高精度、灵敏放大输出，要求衔铁组件具有极高的位置精度及尺寸精度，其中过盈配合参数设计极为重要。基于厚壁圆筒过盈配合原理，通过对零件材料的屈服极限进行理论分析计算，确定了合理的过盈量范围。计算原衔铁组件各接触面等效应力均超过了材料屈服极限，这是时常出现的管弹簧受损等问题产生的重要原因。经过衔铁组件装配与测试，解决了装配时常出现的组件压配变形、平行度等指标超差及管弹簧受损等问题，过盈联接可靠性和合格率较原来有了很大提升，本文确定的设计参数能更好地满足产品生产要求。

The Design of Interference Fit Parameters for the Armature Assembly of Electro-hydraulic Servo Valve

Electro-hydraulic servo valve is an important control component of the aerospace precise electro-hydraulic servo system, and the armature assembly is the key component responsible for the electro-hydraulic conversion of servo value. To ensure the high precision and sensitive amplification output of attitude control signal, the armature assembly is required to have extremely high position and dimension accuracy, the design of interference fit parameters is very important. Based on the interference fit principle of the thick wall cylinder, the reasonable range of interference is determined by the parts material yield limit theory. The equivalent stress of the original armature assembly exceeds the material yield limit, which is an important reason for the damage of the tube spring. Through assembly and testing of the armature, the problems such as excessive pressure deformation, parallelism, and damage of pipe spring are solved, and the reliability and the qualified rate of interference fit joint originally have a very big promotion. The design parameters determined with the proposed approach in this paper can better satisfy the requirements of the products.