valve springvælvspriŋ短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 气门弹簧 In this paper,3D finite element analytical models of the valve spring and the valve- spring retainer are established for analysis of a variable stiffness valve spring. 本文以变刚度气门弹簧为研究对象，建立了气门弹簧、弹簧座的三维有限元组合模型。 cnki