This paper introduces the structure and principle of SJD-11 two-speed carhauler. The caculation for the design of the critial gearing parts and the calculating results ofmain parameters are given.

• 介绍了SJD－11型双速调度运搬绞车的结构和原理，给出了该绞车在总体设计中主要参数的设计计算方法及计算结果，并介绍了该绞车的生产和试验过程。