换挡离合器摩擦元件周向间歇接触温度场研究*

doi:10.19562/j.chinasae.qcgc.2018.09.010

汽车工程 ›› 2018, Vol. 40 ›› Issue (9): 1068-1075.doi: 10.19562/j.chinasae.qcgc.2018.09.010

换挡离合器摩擦元件周向间歇接触温度场研究^*

李和言^1,2,李明阳¹,马彪^1,2,杜秋¹,李慧珠¹,于亮¹

1.北京理工大学机械与车辆学院,北京 100081;
2.北京电动车辆协同创新中心,北京 100081

收稿日期:2017-07-13 出版日期:2018-09-25 发布日期:2018-09-25
通讯作者: 李和言,副教授,E-mail:lovheyan@bit.edu.cn
基金资助:
国家自然科学基金(51575042)和工信部基础产品创新科研项目(VTDP-3203)资助

Clutch with Circumferential Intermittent Contact

Li Heyan^1,2, Li Mingyang¹, Ma Biao^1,2, Du Qiu¹, Li Huizhu¹ & Yu Liang¹

1.School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081;
2.Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing 100081

Received:2017-07-13 Online:2018-09-25 Published:2018-09-25

摘要/Abstract

摘要： 考虑温度和滑摩速度对摩擦因数的影响,建立了宏观维度下换挡离合器摩擦元件周向间歇接触温度场迭代计算模型,研究了与花键齿数相对应的间歇接触对温度场和摩擦因数的影响,并通过温度测量实验对模型进行了验证。结果表明:间歇接触会导致对偶片表面出现高温区,高温区分布与花键齿数相对应,对偶片表面最高温度与平均温度均随花键齿数增加而降低,对偶片温升与花键齿数和滑摩时间呈非线性相关。相同滑摩条件下,不同花键齿数对应的摩擦因数随滑摩时间增加而逐渐增大至同一最大值,在摩擦因数达到最大值前,花键齿数较少的对偶片对应的摩擦因数较大。换挡工况下,花键齿数较少的摩擦元件较快进入干摩擦状态,在较短时间内便可达到较大的摩擦因数;车辆蠕行等离合器长时滑摩工况下,花键齿数较多的摩擦元件局部温升较小,具有较好的热安全性。

关键词: 换挡离合器, 对偶片, 间歇接触, 温度场, 摩擦因数

Abstract: With consideration of the effects of temperature and sliding velocity on friction coefficient, an iterative model for calculating the temperature field of circumferential intermittent contact between friction elements of shifting clutch under macro-dimension is established to study the influence of intermittent contact, corresponding to the number of spline teeth, on temperature field and friction coefficient, and the model is validated by friction coefficient measuring experiments. The results show that intermittent contact may result in high temperature zones appear on the surface of friction disks, and the distribution of the high temperature regions corresponds to the number of spline teeth. The highest temperature and average temperature of friction disks lower with the increase of the number of spline teeth, and the temperature rise in friction disks exhibits nonlinear correlation with the number of spline teeth and sliding time. Under the same sliding condition, with the sliding time extending, the friction coefficients, corresponding to different number of spline teeth gradually increases to the same maximum value, and before the friction coefficient reaches the maximum value, the friction coefficient corresponding to fewer spline teeth is larger. Under shifting condition, the friction disks with less spline teeth quicker enter the state of dry friction and reach larger friction coefficient in shorter period of time. Under the long time sliding conditions such as when the vehicle creeps with foot on clutch, the friction disks with more spline teeth have less local temperature rise with better thermal safety

Key words: shifting clutch, friction disk, intermittent contact, temperature field, friction coefficient

李和言,李明阳,马彪,杜秋,李慧珠,于亮. 换挡离合器摩擦元件周向间歇接触温度场研究^*[J]. 汽车工程, 2018, 40(9): 1068-1075.

Li Heyan, Li Mingyang, Ma Biao, Du Qiu, Li Huizhu & Yu Liang. Clutch with Circumferential Intermittent Contact[J]. , 2018, 40(9): 1068-1075.

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换挡离合器摩擦元件周向间歇接触温度场研究^*

Clutch with Circumferential Intermittent Contact

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