一台佳木斯联合收割机厂生产的JL1075型联合收割机,使用一段时间后,行走无级变速油缸轴轴承经常烧损。开始,驾驶员以为轴承质量有问题,接连换了10多个轴承,还是烧损,新轴承最短的使用时间仅2～3h。经观察并向驾驶员了解故障发生的前后情况,得知是外口的7507轴承经常烧损。检查各部零件没有发现任何问题。此油缸安装2个对置的7507锥形滚柱轴承,为什么总烧损外口的轴承呢? A Jiamusi combine harvester plant production JL1075 combine harvester, after using for a period of time, walking continuously variable speed cylinder shaft bearings often burn. At the beginning, the driver thought there was a problem with the quality of the bearings, replaced more than 10 bearings one after another, or burned, and the shortest working time of new bearings was only 2 ~ 3h. After observation and to the driver to understand the situation before and after the failure, that is outside the mouth of the 7507 bearing often burn. Check the various parts did not find any problems. This cylinder installed two opposed 7507 tapered roller bearings, why the total loss of the outer bearing it?