过盈量及滚花方式对装配式凸轮轴压装失效的影响

doi:10.13229/j.cnki.jdxbgxb20200647

摘要/Abstract

摘要：

基于有限元仿真方法，研究了过盈量及滚花方式对装配式凸轮轴滚花连接塑性变形及相对滑动等压装失效问题的影响。结果表明：增加连接过盈量能够获得更大的压装力和摩擦剪应力，使连接件配合面越不容易发生相对滑动；另外，过盈量的增加也将导致凸轮轮廓面径向位移数值变大且梯度变化更不均匀，轮廓面过渡区域附近的应力集中明显。为保证配合面不发生打滑，当轴体相对凸轮片较硬时，宜选用轴向滚花连接；反之，则采用横向滚花连接。横向滚花压装试验测得的压装力数据验证了1/36等分压装模型和完整压装模型的合理性。

关键词: 车辆工程, 装配式凸轮轴, 滚花连接, 过盈量, 连接强度, 塑性变形

Abstract:

Based on the finite element method， the influences of the interference fit and knurling connection types on the two major press fitting failure problems including plastic deformation and sliding during knurling connection of assembled camshaft were investigated. The results indicate that a large press fitting force and frictional shear stress could be obtained for a large interference fit to inhibit the sliding between the fit surfaces. On the other hand， the cam profile’s radial displacement magnitude and gradient change increase with the e interference fit， resulting in an obvious stress concentration around the transition region of cam profile. To keep the fit surfaces from sliding， the axial knurling connection is suggested when the hardness of shaft is larger than that of cam. Instead， the radial knurling connection is more beneficial to inhibit the occurrence of sliding between the fit surfaces for a assembled camshaft with a softer shaft. The press fitting force obtained from the radial knurling connection test of assembled camshaft validates the rationality of both the 1/36 finite element model and the complete finite element model.

Key words: vehicle engineering, assembled camshaft, knurling connection, interference fit, connection strength, plastic deformation

中图分类号:

U466

陈剑斌,周宋泽,费峰永,陈永龙,凌国平. 过盈量及滚花方式对装配式凸轮轴压装失效的影响[J]. 吉林大学学报(工学版), 2021, 51(6): 1959-1966.

Jian-bin CHEN,Song-ze ZHOU,Feng-yong FEI,Yong-long CHEN,Guo-ping LING. Influences of interference fit and knurling connection type on press fitting failure of assembled camshaft[J]. Journal of Jilin University(Engineering and Technology Edition), 2021, 51(6): 1959-1966.

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参考文献 10

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试验组别	第1组	第2组	第3组	第4组
凸轮1	17.23	17.99	18.11	18.99
凸轮2	14.86	15.70	15.42	15.63
凸轮3	15.37	16.19	16.92	16.00
凸轮4	14.97	15.96	16.43	15.42
凸轮5	15.78	16.98	16.22	16.26
凸轮6	16.28	16.32	15.98	16.80
凸轮7	15.75	15.74	16.12	16.17
凸轮8	14.64	16.34	15.78	15.74

试验组别	腐蚀深度/mm	第1次应力值/MPa	第2次应力值/MPa	平均值/MPa	备注
第1组	0.48	381.7	373.4	377.55	堵头
第2组	0.54	288.4	280.4	284.40	-
第3组	0.51	240.7	253.7	247.20	-
第4组	0.53	272.3	285.4	278.55	-