Occurrence of brittle flaking on bearings used for automotive electrical instruments and auxiliary devices
Occurrence of brittle flaking on bearings used for automotive electrical instruments and auxiliary devices
复制标题
汽车电气设备及辅助设备用轴承发生脆性剥落的原因
DOI：
10.1016/0043-1648(96)06990-6
复制
发表时间：
1996
期刊：
影响因子：
5
通讯作者：
H. Tanaka
中科院分区：
文献类型：
--
作者：
K. Tamada;H. Tanaka
发动机附件传动带的高传动效率导致了一种新型的轴承损坏，NTN称之为“脆性剥落”。这种新型的轴承损坏已经在汽车电气仪表和辅助装置中使用的轴承中观察到。本文总结了近年来阐明脆性剥落损伤的起始机理的试验结果。发现轴承中使用的润滑脂类型对脆性剥落的发生具有显著影响。因此，使用特定的润滑脂可以避免脆性剥落。在加速-减速试验下运行的轴承内圈、外圈和滚珠中测得的氢含量在固定环中最高，在固定环中可能发生脆性剥落。当试样在试验前充入足够量的氢时，在滚动接触疲劳试验中再现了脆性剥落。试验结果得出结论，脆性剥落是由于润滑脂通过摩擦化学反应分解导致氢扩散到钢中引起的。
The higher transmission efficiency of engine accessory drive belts has resulted in a new type of bearing damage, called “brittle flaking” by NTN. This new type of bearing damage has been observed in bearings used in automotive electrical instruments and auxiliary devices. This paper summarizes recent test results which clarify the initiation mechanism of the brittle flaking damage. the type of grease used in the bearing was found to have a significant effect on the occurrence of brittle flaking. Thus, brittle flaking can be avoided by using specific greases. The amount of hydrogen measured in the inner rings, outer rings and balls of bearing run under acceleration-deceleration tests, was highest in the stationary ring, where brittle flaking was likely to occur. Brittle flaking was reproduced in rolling contact fatigue tests when the test specimens were charged with a sufficient amount of hydrogen prior to testing. The test results concluded that brittle flaking is caused by the diffusion of hydrogen into the steel due to the decomposition of the grease by a tribochemical reaction.