Nowadays trimetal bearings with galvanically applied running layers are employed chiefly as the main and big end bearings in highly loaded Diesel engines. Out of the multitude of problems arising in connection with these bearings the author proposes to deal with those that repeatedly occupy the designer, namely corrosion, cavitation, erosion and failure of the running layer bond. All these phenomena are very similar in appearance, and can be distinguished from each other by the non-expert only with great difficulty. It will now be shown how these running layer problems originate, and how they can be identified and encountered. To withstand corrosive attack from the luboil the bearing running layer must contain at least 6 % indium or tin in finely distributed form. There is no galvanically applied running layer that is proof against cavitation. Slight variations are due solely to the analysis. Cavitation damage to the running layer of bearings is locally restricted as a rule, and is usually caused by unsuitable arrangements for the admission of luboil to the bearings. It can be prevented by providing smoother transitions from the oil hole or groove to the running surface of the bearing. Erosion of the bearing running layer cannot be eliminated, but only modified in its intensity. This can be achieved by minimizing the surface roughness of the journals and also by adequate filtering of the lubricating oil. Bearings with a lead-tin running layer require a barrier between the running layer and the lead-bronze as a rule, to prevent diffusion processes and the bonding failures resulting from them. Bearings with lead bronze sintered-on constitute an exception in part. Lead-indium-base running layers possess a good bond with the lead-bronze.
Bearing problems in internal combustion four-stroke rail traction engines
Lagerprobleme bei Viertakt-Verbrennungsmotoren für Bahnantriebe
1965
30 Seiten, Bilder
Aufsatz (Konferenz)
Datenträger
Englisch
Ausfall , Bleibronze , Dieselmotor , Erosion , Indium , Kavitation , Korrosion , korrosiver Verschleiß , Lager (Maschinenelement) , Lauffläche , Lokomotivmotor , Schmieröl , Viertaktmotor , Zinn , Rauigkeit
Regenerative Supercharging of Four Stroke Internal Combustion Engines
SAE Technical Papers | 1983
|Two-stroke and four-stroke engines for railway traction
Engineering Index Backfile | 1950
Regenerative supercharging of four stroke internal combustion engines
Kraftfahrwesen | 1983
|Engineering Index Backfile | 1952
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