Abstract: A machine consists of frame , transmission shaft, detection device , leg and some other parts. Asthe core of the machine, transmission shaft accounts a lot for the operation of machines. In designing thetransmission shaft, the rationality of the shaft itself and other parts connected should also be considered. Inthe design process, the stiffness, strength of the shaft and the fixation mode of the parts connected with theshaft should be comprehensively considered based on the design input. Taking the design process of theransmission shaft of the pallet code extension as an example, this paper briefly introduces the method andsteps of designing the transmission shaft , and puts forward the problems that should be paid attention to indesigning the structure, calculating strength , rigidity as well as drawing of the transmission shaft.

Key words: machine, transmission shaft, design method, design step