介绍了汽车起重机中主臂头部定滑轮组的润滑结构及有利于副臂安装使用的新型结构设计。通过主臂头部定滑轮组润滑结构的新型设计,简化了结构及加工工艺,方便了对滑轮组的润滑;通过有利于副臂安装使用的新型结构设计,副臂安装与收回工作效率大大提高。 This paper introduces the lubrication structure of the fixed pulley block of the main boom in the truck crane and the new structure design which is helpful for the installation and use of the auxiliary arm. The new design of the lubricating structure of the main pulley block of the main arm simplifies the structure and the processing technology and facilitates the lubrication of the pulley block. The efficiency of the installation and retraction of the auxiliary arm is greatly enhanced by the new structural design which is favorable to the installation and use of the auxiliary arm.