起重机小车轮压经轨道传给箱形主梁上盖板和腹板，使之产生局部应力。
The local stress in the box beam is caused by the wheel pressure of the trolley conveyed along the track onto the upper flange and the web of the beam.
本课题主要对起重机小车的运行机构进行了总体设计，介绍了小车的基本构造及传动方案。
This paper focuses on design of running mechanism of the dolly, introducing basic constitution of dolly and driving project.
这些缺陷反过来又影响起重机或小车的正常运行。
These defects in turn affect the normal operation of cranes or cars.
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