Abstract
The planetary gear seat is a key part of electric winch, a self-help equipment, in cross-country vehicle. It features a complicated form, high running load, and definitely reliable operation. It is difficult to make the part by machining. We find P/M technology is a fairly better way but never easy one, because the structure of two steps internal involute gears is very special and height of the part is comparatively high. In this paper we will introduce you how to manufacture this part by P/M technology in our company.