【摘要】 为研究环面型CVT凸轮加载机构轴向力迟滞的影响因素,在离心力和由自旋产生的摩擦力作用下,对传统的圆柱滚子和新型的圆锥滚子两种自动加载机构进行受力分析,分别在自动加载机构静止和高速旋转时分析其轴向力迟滞特性。数值计算结果表明,在输入转矩增加和减小过程中,静止的圆柱滚子实际轴向力分别为理想轴向力的80%和120%,在高转速下,离心力使圆柱滚子产生的轴向力迟滞现象更为严重,最严重时实际轴向力只有理想轴向力的50%;而圆锥滚子静止时的轴向力分别为理想轴向力的98%和102%。高速时实际轴向力与理想轴向力的偏差在7%以内,轴向力迟滞现象显著减弱。更多还原

【Abstract】 For studying the influencing factors of axial force hysteresis in the cam loading mechanism of toroidal continuously variable transmission(CVT),a force analysis on the automatic loading mechanism with both traditional cylindrical and novel tapered rollers is conducted under the action of centrifugal force and friction force induced by the self spinning of rollers,and their hysteresis characteristics of axial force in loading mechanism are analyzed respectively in both standstill and high-speed rotation conditions.The results of numerical calculation show that with cylindrical roller,the real axial forces in input torque increase and decrease process are 80% and 120% of ideal axial force respectively in standstill condition,and the hysteresis phenomenon is more severe due to centrifugal force in high-speed rotation condition with a real axial force being only 50% of ideal one at worst;while with tapered roller,the corresponding figures are 98% and 102% respectively in standstill condition,and the difference between real and ideal axial forces is within 7% in high-speed condition,resulting in significant weakening of axial force hysteresis.更多还原