Project Assessment of the Reliability of the Joint of a Circulation-Loaded Ring of a Rolling Bearing with a Shaft of Tolerance Class js6

Study and assessment of the reliability of a joint of a circulation-loaded ring of a rolling bearing 50217 and a flange of the Yaroslavl Engine Plant gearbox demultiplier have been carried out. It has been found that, upon adding the dispersion of the sizes of the analyzed holes and shafts, a dispersion of gaps and interferences is formed, in which the probability of occurrence of interference fits (93%) prevails. After pressing, due to the collapsing of the roughness of the hole and the shaft, the probability of interference with a gap increases (51.7%). In addition, upon operating under the action of a load, the possibility arises that joints with an actual interference less than the smallest functional one (8.1 µm) can turn. It has been proven that, when shaft tolerance class js6 is assigned, interference with a gap will prevail in the joint, which will lead to rotation of the circulation-loaded bearing ring in more than 80% of the joints, significantly reducing the reliability of the demultiplier bearing assembly and the gearbox of the Yaroslavl Engine Plant engine as a whole.