Graph theory based scheme design synthesis for tractor fixed shaft gearbox

The traditional transmission scheme design of tractor fixed shaft gearbox mainly depends on the trial-and-error method, the design experience and the inspiration of designers, which usually lead to many problems such as low design efficiency, serious motion interference and easy to lose the better design etc. and could not meet the innovative design requirement of gearbox for multi-shift, systematization and intellectualization. Therefore, a graphic theory-based design method for transmission scheme of fixed-axle gearbox was proposed. Based on graph theory and gearbox design principle, the type synthesis and number synthesis of gearbox transmission schemes were realized, and the transmission path analysis of the optimal transmission scheme was done with the depth-first search algorithm. Finally, the example design results show that the transmission scheme design of fixed shaft gearbox based on graph theory could effectively reduce the design difficulty, avoid missing the optimal transmission schemes, and provide some theoretical support for the innovative design and intelligent design of tractor gearbox transmission scheme.