1939-01-01

Engine Bearings - From Design to Maintenance 390182

SIX major causes of bearing failures are catalogued, which include matters of engineering and design, procurement practices, misuse and abuse in operation, faulty installations, unsuitable lubricants, and mechanical faults in the bearings themselves.
Although there are four general types of bearing materials in common use today for main and rod bearings - tin-base babbitts, high-lead babbitts, cadmium alloys, and copper-lead mixtures, the author shows that not one of them is a universal bearing material - each has its own particular field of usefulness, and these fields are defined in terms of maximum unit pressure, Zn/P, PV, oil-reservoir temperature, and crankshaft hardness.
Design factors that react against indicated satisfactory performance are considered, including strength and stiffness of the bearing structure, oil flow to the rod bearing, restrictions in feed grooves, oil clearance, and so on. Standards of design pertaining to these points are set up.
The need for, and the advantages to be gained by, more comprehensive bearing purchase specifications are emphasized.
Identification of failure, due to misuse and abuse, is treated largely by illustration of typical examples.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 16% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Influence of Micro Surface Structures of Nodular Cast Iron Crankshafts on Plain Bearing Wear

880097

View Details

TECHNICAL PAPER

Performance of Plasmaspray Coated Bore 4.6L-V8 Aluminum Block Engines in Dynamometer and Fleet Vehicle Durability Tests

970008

View Details

TECHNICAL PAPER

Steel Piston Rings - A Solution with Lower Environmental Impact

962318

View Details

X