In the diploma thesis an analysis of the gearbox used to transmit power, torques and speed on the Jwell extruder was carried out. To protect the interior of the gearbox against external contaminants, oil seals are used, but they do not provide adequate sealing in the weakest point analyzed. The problem is the direct connection of the cylinder to the gearbox and the wet raw material. The raw material comes in contact with the heated part of the cylinder, which leads to the destruction of the shaft seal. The thesis therefore presents the optimization of sealing in this point. We installed four different combinations of seals at this sealing point, where we had to consider space limitations and working conditions. Its effectiveness was monitored by visual inspections and laboratory analysis of the oil. Additionally, the influence that presence of water in oil has on the damage caused to the gear bearings was measured by monitoring the bearings’ condition. In conclusion, we presented the results. We have found that two combinations of tested seals are suitable for our application: the combination of the labyrinth seal with the shaft oil seal and the combination of the felt seal ring with the shaft oil seal.
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