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1.改造原因上海204牵引电动机封环是用M8×22镀锌钢六角螺栓四条紧固在外紧圈上。四条螺栓在上紧时,由于工艺问题往往造成螺栓松紧程度不一致,产生应力集中。再加上运行中强烈振动与高速运转,使螺栓断、封环窜出,有的封环裂成几块。电机内甩进去齿轮箱油,不但影响电机绝缘,轴承温升高,而且封环裂块可能卡在大小齿轮之间,造成电机烧损。
1. Reasons for transformation Shanghai 204 traction motor seal ring is M8 × 22 galvanized steel hex bolts four fastened on the outer ring. Four bolts in the tightening, due to process problems often result in inconsistent degree of bolt tightness, resulting in stress concentration. Coupled with the operation of a strong vibration and high-speed operation, the bolt broken, sealing ring sprang, and some ring cracked into pieces. The motor thrown into the gearbox oil, not only affect the motor insulation, bearing temperature rise, and seal ring crack may be stuck in between the size of the gear, causing the motor burn.