...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Tribology Transactions >Bearing Fatigue Life Tests in Advanced Base Oil and Grease for Space Applications
【24h】

Bearing Fatigue Life Tests in Advanced Base Oil and Grease for Space Applications

机译：用于太空应用的高级基础油和润滑脂的轴承疲劳寿命测试

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Two synthetic base oils (815Z and 2001A) and two greases (601 EF and R2000) used for space applications have been studied at ground level. Rheological tests were performed in order to characterize the behavior of each of the base oils versus the pressure and the temperature. Next, the effect of base oils and greases on ball bearing fatigue life was carried out using thrust ball bearings. The results of L10 life tests showed a bearing life order from the highest to the lowest of grease 601 EF (blended with base oil 815Z), base oil 2001A, grease R2000 (blended with the base oil 2001A) and, the lowest, the base oil 815Z. The general tendency of the base oils and the greases shows that the bearing life increases with the EHL film parameter. However, the anticipated beneficial effect of an apparently high film parameter for the base oil 815Z was not seen due to permanent viscosity loss in the EHL contact. The results showed that the viscosity of the base oil 815Z, which contains the acetal group (-OCF{sub}2O-), was decreased by mechanical shear at the high shear rate in the EHL conjunction and the EHL oil film was thinner than expected. Hydrogen fluoride is released with the decomposition of the acetal group. As a result, the permanent viscosity loss at high Hertzian pressure and the hydrogen fluoride generation shortened bearing life with the 815Z base oil. In the case of grease 601 EF with base oil 815Z, the permanent viscosity loss did not occur in ball bearings and the bearing life is extended.
机译：在地面上对两种合成基础油（815Z和2001A）和两种润滑脂（601 EF和R2000）进行了研究。进行流变学测试以表征每种基础油相对于压力和温度的行为。接下来，使用推力球轴承进行基础油和润滑脂对球轴承疲劳寿命的影响。 L10寿命测试的结果表明，轴承寿命从润滑脂601 EF（与基础油815Z混合），基础油2001A，润滑脂R2000（与基础油2001A混合）的最高到最低顺序，最低的是基础油。油815Z。基础油和润滑脂的总体趋势表明，轴承寿命随EHL膜参数的增加而增加。但是，由于EHL接触中的永久性粘度损失，未看到基础油815Z的表观参数高的预期有益效果。结果表明，在高剪切速率下，EHL接头中的机械剪切力降低了含缩醛基（-OCF {sub} 2O-）的基础油815Z的粘度，并且EHL油膜比预期的薄。氟化氢随着缩醛基的分解而释放。结果，815Z基础油在高赫兹压力下的永久粘度损失和氟化氢的产生缩短了轴承的使用寿命。在使用基础油815Z的润滑脂601 EF的情况下，在球轴承中不会发生永久性的粘度损失，因此可以延长轴承寿命。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号