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中南大学学报(自然科学版)

Journal of Central South University

第50卷    第7期    总第299期    2019年7月

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文章编号:1672-7207(2019)07-1558-09
输入转速波动下斜撑离合器的动态接合特性
严宏志1, 2, 3,田昊1, 2,朱楚4,李智4,秦娟2, 3,刘建睿1, 2,王志标2, 3

(1. 中南大学 机电工程学院,湖南 长沙,410083;
2. 中南大学 高性能复杂制造国家重点实验室,湖南 长沙,410083;
3. 中南大学 轻合金研究院,湖南 长沙,410083;
4. 中国航发湖南动力机械研究所,湖南 株洲,412002
)

摘 要: 采用有限元方法建立PCE型斜撑离合器动力学模型,分析楔块与内外环Mises接触应力、内外环转速跟随性和扭矩传递等特性,得到输入转速随机波动对PCE型斜撑离合器动态接合特性的影响规律。研究结果表明:斜撑离合器楔块的接触应力约为内外环接触应力的1.6倍,输入转速波动8%导致的接触应力波动最大,其标准差达到5%转速波动时的1.5倍;输出转速的跟随误差率大于输入转速波动率;输入转速波动导致的离合器传递扭矩平均波动率为转速波动的5.5倍左右,8%和10%转速波动导致的扭矩波动达到近50%,极大地影响了扭矩传递的稳定性,故输入转速波动应控制在5%以内。

 

关键词: 斜撑离合器;随机波动;接合特性

Dynamic engagement characteristics of sprag clutch with fluctuation of input speed
YAN Hongzhi1, 2, 3, TIAN Hao1, 2, ZHU Chu4, LI Zhi4, QIN Juan2, 3, LIU Jianrui1, 2, WANG Zhibiao2, 3

1. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;
2. State Key Laboratory of High Performance Complex Manufacturing,
Central South University, Changsha 410083, China;
3. Light Alloys Research Institute, Central South University, Changsha 410083, China;
4. AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412002, China

Abstract:The dynamic model of PCE type sprag clutch was established by using finite element method. The Mises contact stress between wedge and inner/outer ring and the characteristics of inner/outer ring speed following and torque transfer were analyzed. The effects of dynamic engagement characteristic of the PCE type sprag clutch with the input speed random fluctuation were obtained. The results show that the contact stress of wedge of sprag clutch is about 1.6 times the value of the inner and outer ring. The maximum fluctuation of contact stress is caused by 8% fluctuation of input speed, and its standard deviation is 1.5 times of that of 5% speed fluctuation. The following error rate of the output speed is greater than the fluctuation rate of the input speed. The average fluctuation rate of the clutch transfer torque caused by the fluctuation of the input speed is about 5.5 times of the fluctuation of the input speed. The torque fluctuation due to 8% and 10% rotational speed fluctuation reaches nearly 50%, greatly affecting the stability of torque transfer. So, the input speed fluctuation should be controlled within 5%.

 

Key words: sprag clutch; random fluctuation; engagement characteristic

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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