Reverse Design Of The Manual Operating Mechanisms In New Type Harvester

The operating mechanisms of the harvesters are characterized by original conceptionand smart design. Based on the reverse engineering design method,This paper conducted theanalysis and synthesis to such four main operating mechanisms in above-mentionedharvesters as used for Steering plus lifting integrated operation, clutches loading andunloading, brake pedal control, and HST (Hydralic Static Transmisson) operating.Firstly, according to the functional requirements of the rise-fall movement on the cuttingportion and the steering movement on the whole machine, degrees of freedom analysis and amathematical model of the Steering and lifting integrated operating mechanism wasestablished, analyzed and simplified, leading to a mathematical function for design.Secondly, according to the working principle of the tensioning wheel clutches, themathematical model was obtained according to the force analysis with the conception of deadpoints (as the special positions) involved.Thirdly, the mathematical mode of the brake pedal plane linkage was established on thebasis of understanding its working principle. Then the design equations, conditions and const-raints to the mechanisms were also achieved. And, by means of MATLAB optimization tool-box, the local optimal solutions were obtained.Finally, as an operating mechanism to HST(Hydralic Static Transmission, a key powerand speed adjusting sub-system in the harvester), the RSSR spatial mechanism with a highoutput accuracy would insert an important impact on the machine. By means of decomposit-ion method, we deduced the functions reflecting the relationship between the inputs andoutputs, followed by the analysis on the influence to the output angles due to the lengths andangles of linkages. Numerical solutions were achieved by Newton iterative method for thenonleaner equations established before. In order to verify the results of the synthesis, motionsimulations were carried out and comparason of the two results were also done.This research can provide a reliable theoretical support for the harvester-used operatingmechanisms’ analysis and synthesis. And meanwhile it would also present a useful referancefor the similar mechanism design. What’s more, it would be a guideline to some extent forinnovation design...