摘要
为探讨-40℃低温下PCE型斜撑离合器接触性能的特点,通过有限元方法建立了斜撑离合器的分析模型。在不限制楔块任何自由度的情况下,分析了不同时刻楔块外凸轮的接触应力,得到了-40℃低温下PCE型斜撑离合器的接触特性规律。结果表明:刚加载时,楔块外凸轮的轴向方向的最大Mises应力出现在弹簧槽边界所在的竖直平面附近;加载完成时,楔块外凸轮的最大Mises应力出现在轴向方向的中间部位;运行一段时间后,在左右弹簧槽之间的楔块外凸轮部分的应力基本不变,而左右两侧的应力将出现一定程度的下降;楔块在传动过程中将会出现轴向窜动。可见,极低温对斜撑离合器的动态接触特性将有显著的影响,有必要根据实际情况对楔块进行强化。
In order to explore the contact characteristics of the PCE-type sprag clutch at-40℃,the finite element model of the sprag clutch is established.Without restricting any degree of freedom of the wedge,the contact stress of the outer cam of the wedge at different moments is analyzed,and the contact characteristics of the PCE-type sprag clutch at-40℃are obtained.The results are as follows:when just loaded,the maximum Mises stress in the axial direction of the outer cam of the wedge appears near the vertical plane where the spring groove boundary is located;when the loading is completed,the maximum Mises stress of the outer cam of the wedge appears in the middle of the axial direction;after a period of operation,the stress of the outer cam of the wedge between the left and right spring grooves is basically unchanged,and the stress on the left and right sides decreases to a certain extent;the wedge will move axially during transmission.It can be seen that the extreme low temperature has a significant impact on the dynamic contact characteristics of the sprag clutch.Therefore it is necessary to strengthen the wedge according to the actual situation.
作者
黎佳
王志标
LI Jia;WANG Zhibiao
出处
《现代机械》
2020年第6期1-5,共5页
Modern Machinery
基金
湖南省自然科学基金项目(2019JJ70081)
湖南省教育厅科学研究项目(18C1330)
湖南工业职业技术学院校级课题(GYKYZ201901)。
关键词
低温
斜撑离合器
接触特性
分析
low temperature
sprag clutch
contact characteristics
analysis
