目前国内小吨位汽车起重机,多数采用蜗轮回转机构,蜗轮早期失效屡有发生,这个问题成了工程起重机行业普遍关注的难题。我们对47例早期失效,3例运转四年但非常完好的蜗轮进行了剖析,找出了早期失效的主要原因。汽车起重机用蜗轮回转机构,是在低速、重载情况下工作。其结构见图1,其参数见表1。 At present, the domestic small-tonnage truck cranes mostly use worm gear swing mechanisms, and early failure of the worm gear has occurred frequently. This problem has become a common concern in the construction crane industry. We analysed 47 cases of early failures and 3 cases of worm gears that had been running for four years but were very good. We identified the main causes of early failure. The worm gear slewing mechanism for truck cranes operates at low speed and heavy load. Its structure is shown in Figure 1, and its parameters are shown in Table 1.