介绍新型弹性滑键式变速器的特点 ,以及该变速器的换档原理 ,并对弹性滑键变速换档机构进行理论分析。重点论述了弹性滑键的受力分析、失稳计算、强度校核。建立了弹性滑键失稳分析的简化模型 ,推导出弹性滑键顺利滑移的条件和失稳时临界压力计算公式 ,为合理设计弹性滑键提供了理论依据 This paper introduces the characteristics of the new type of elastic sliding key transmission, as well as the gear shift principle of the transmission, as well as the theoretical analysis of the elastic sliding key shift gear shift mechanism. The stress analysis, buckling calculation and strength checking of elastic sliding key are mainly discussed. A simplified model of instability analysis of elastic sliding key was established. The conditions of smooth sliding of elastic sliding key and the formula of critical pressure in instability were deduced, which provided a theoretical basis for the rational design of elastic sliding key