An Analysis of Lubricating System of Automobile Gasoline Engine
871659
09/01/1987
- Event
- Content
- Influences of oil-flow and oil temperature on frictional torques of whole engine and main lubricating components were determined by motoring method. Oil-flow rate, temperature and pressure in main lubricating pathes were directly measured under the same conditions. Oil-flow rate and frictional coefficient of crankshaft system were estimated by theoretically analysing Reynolds’ equation. Experimental data were discussed based on oil-flow analyses in lubricating system. Engine frictional torque becomes smallest when the engine is supplied with an optimum oil-flow rate, 2.5 - 3.5 1/min where the ratio of oil-flow rate is 10 - 20 % in crankshaft system, 30 - 40 % in a piston-connecting rod system, and 50 - 60 % in valve system. The optimum oil-flow rate which minimises the frictional torque is 1 - 2 1/min for crankshaft and piston-connecting rod systems, and 3-4. 1/min for a valve system.
- Pages
- 12
- Citation
- Tran, P., Yamamoto, T., Baba, Y., and Hoshi, M., "An Analysis of Lubricating System of Automobile Gasoline Engine," SAE Technical Paper 871659, 1987, https://doi.org/10.4271/871659.