南口工厂于1979年开始大批量生产用于我国铁路主型货车的197726型无轴箱双列圆锥滚子轴承。 为了及时掌握这种轴承的结构性能、制造质量及滚动轴承车的运用情况、经济效果等,以加速实现铁路货车滚动轴承化,从1980年开始,铁道部工业总局和车辆局每年都组织由轴承制造厂和有关的装车厂、铁路 South mouth factory in 1979 mass-produced for the main railway vehicles in China 197726 non-axis double row tapered roller bearings. In order to timely grasp the structural performance of this bearing, manufacturing quality and the use of rolling bearing vehicles, economic effects, etc., in order to accelerate the rolling bearing of railway wagons, from 1980 onwards, the Ministry of Railways Administration of Industry and the vehicle each year organized by the bearing manufacturer And the relevant loading factory, railway