The testing of the influence of the roughness of the crankshaft journal upon the durability of the crankshaft bearing in engines of agricultural machines (original) (raw)

2010, Scientific Problems of Machines Operation and Maintenance

In the process of the operation of agricultural tractors and harvesters, it is necessary to perform periodical technical service related to the repair of the crankshaft bearings in Diesel engines. The solutions applied in machine finishing of crankshaft journals regenerated by grinding, make it necessary to run the same in operation, which results from the fact that working surfaces are not suitable for the conditions of use. Therefore, testing was initiated in order to establish whether the roughness of working surfaces of crankshaft journals obtained as a result of the repairs may have a considerable influence upon the limitation of durability of the journalbushing sliding joint. Wear tests were performed in the model arrangement constituting material representation and, in the case of crankshaft journals, also the geometrical representation of real parts. The wear tests were performed for established sliding and load values with the assumption

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