As one of the new types of farm implements,the two-wheeled double-shared plough went through the stages of popularization on a trial basis,popularization at selective areas and comprehensive popularization.

In order to solve the cam framework of printing equipment halting exactly and less backhaul concussion,the author researches the biconvex cam sine acceleration framework,and designs biconvex cam's structure,geometry dimension and outline.

Structure optimum design of double wheel and direct balance pumping-units;

We upgraded old pumping unit,developed new double wheel pumping unit,single crank long stroke pumping unit,and designed power saving units.

The paper introduced two methods of fin cutting in precision hole and dual gear (or gear with shifter fork)slot.

Presents the study on a semi precision forging process suitable for dual gear, by which, the machining tolerance of a single side achievable on the contour of the gear is 0.

A shifting fork controls a cylinder, a geared sleeve is connected with a dual gear, which can generate a high or low speed, and the gearbox can have two types of outputs.