Facing the structure of zhuaner type freight car bogie, this paper introduces the characteristics of Zhuan K type bogie, points out the existing problems of Zhuan K type bogie, combines the production status of Wazhou group company and Dalian Locomotive and rolling stock Co., Ltd. and our work practice, through a large number of tests, from the bearing sealing system, bearing ring heat treatment retention , bearing ring phosphating, bearing roller residual magnetic control, bearing sleeve processing and finished product assembly, foundation brake device and other aspects are studied, analyzed and applied. Bearing and foundation brake device related to railway operation safety are taken as the focus of improvement of Zhuan K. bogie, and the structure of Zhuan K. bogie is optimized. The vehicle dynamics test of the bogie shows that the improvement effect is reliable.<br>
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