The purpose of the paper is to study the lightweight of overhead crane trolley to decrease the overall dimension, weight and wheel pressure of the trolley, increase the working space of the crane and reduce the cost of building. 本文通过研究轻量化桥式起重机小车,以达到减小小车外形尺寸、自重及轮压,增加起重机的工作空间,降低厂房造价的目的。