This paper reports on the effects of crankshaft offset on the engine friction. The effects of crank offset are investigated analytically. In this study, the mathematical models are presented for evaluating the friction level of various engine parts. From the analytical results, the following conclusions are derived: 1) The crank offset is very effective to reduce the piston skirt friction. This is caused by reduction of side force. The effect of offset on the other parts is very small. 2) The crank offset is considerably high at low speed and part load condition. The minimum power loss occurs near the 20 mm offset at low engine speed. As engine speed increases, the offset position for minimizing the piston skirt friction is decreased independently of load condition. 3) The crank offset could not cover the overall operating conditions, and there exists an optimal point where offset effect is extremely high. As can be seen in the presented results, crank offset is very effective to reduce the engine friction losses.
The effects of crankshaft offset on the engine friction
Einfluss der Kurbelwellen-Versetzung auf die Motorreibung
International Journal of Vehicle Design ; 31 , 2 ; 187-201
2003
15 Seiten, 8 Bilder, 3 Tabellen, 10 Quellen
Article (Journal)
English
The effects of crankshaft offset on the engine friction
Automotive engineering | 2003
|The effects of crankshaft offset on the engine friction
Online Contents | 2003
|Offset Crankshaft Effects on SI Engine Combustion and Friction Performance
SAE Technical Papers | 2004
|Offset Crankshaft Effects on Sl Engine Combustion and Friction Performance
British Library Conference Proceedings | 2004
|Offset crankshaft effects on spark ignition engine combustion and friction performance
Automotive engineering | 2004
|