Repair techniques for thin-walled bearing shells

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(1) Cleaning and inspection of bearing shells: Due to the special structure of thin-walled bearings, certain aspects must be taken into account when cleaning and inspecting them. 1) Since the alloy layer of thin-walled bearing shells is relatively thin, usually around 0.30–0.80 mm, bearing shells should be replaced in cases where the surface of the half-shaft bearings is severely worn or damaged due to scoring, and it is not possible to adjust the fit by using shims; as well as in situations where the bearings come loose or when it is not possible to maintain the required maintenance intervals. 2) During major repairs, if half of the shaft bearings become too thin or damaged due to wear and can no longer be used, they should be replaced as a set. (2) Repair and replacement of bearing shells 1) Repair by welding. When small pieces of the bearing alloy layer peel off, it can be repaired by welding. 2) Tightening of the bearing shells. During major or medium-scale repairs of thin-walled bearing shells, as the bearing alloy layer is still relatively thick and there are no other irreparable defects, the bearing shell tightening method can be used to tighten the shell. After scraping, it is used again with a specified fit clearance with the journal. There are three methods for tightening the shaft bushings: The first method is that in cases where adjustment shims were originally installed between the shaft bushing and the bearing housing, the thickness of those shims can be appropriately reduced ； In the second case, where there were no adjustment shims between the shaft bearing and the bearing housing originally, or where the gap remains too large even after the adjustment shims have been removed, brass sheets should be placed between the outer surface of the shaft bearing and the bearing housing ； The third method is to plate copper on the outer circumference of the bearing shell. When the bearing shells need to be replaced, if the diameter of the shaft journal remains unchanged, the original standard bearing shell spare parts can be used; with a little sharpening, they can meet the specified installation requirements. If the journal is worn, or the taper has exceeded the specified value, the bearing shells should be fitted according to the dimensions of the journal after it has been machined.