This thesis describes the process of construction and development of the new roller conditioner for disc mowers. It describes the types and usage of conditioners for disc mowers. The current solutions of roller conditioners with two rollers are shown and described, the thesis also contains analysis of the market and shows new opportunities for upgrades. The ideas for better positioning of rollers are described. Furthermore, new concepts are described and rated. The chosen concept (with three rollers and a gear box) is detailed and models are created. The process of power path from the tractor to the mower is described. This thesis includes the calculation of geometry for spur and bevel gears, calculations of distances between axes, shafts dimensions, construction of housings and bearings. The complete calculation of bevel gears is conducted and described, according to standard SIST ISO 10300. The calculations of shafts and whole design of gear box are included. The goal of this thesis is to develop new gear box, which will be made, implemented and tested on the mowers with roller conditioners.
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