The Effect of Crankshaft Offset on Piston Friction Force in a Gasoline Engine Musashi Institute of Technology

Format:

Book

Conference/Event

Author/Creator:

Nakayama, Kei, author.

Conference Name:

SAE 2000 World Congress (2000-03-06 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2000

Summary:

Offsetting the crankshaft axis with respect to the cylinder axis has been thought to be a method to reduce piston side force[1]. Hence the piston friction is expected to be reduced. An automotive manufacturer has already used the crankshaft offset for a production gasoline engine to improve fuel economy. The authors have conducted research into the effect of crankshaft offset on the piston friction.A single-cylinder engine was modified to have a crankshaft offset. Piston frictional force was measured in real-time by using a floating liner method. In addition, laser-induced fluorescence (LIF) technique was employed to measure oil film thickness on the piston skirt area, and a gap sensor was used to measure piston motion. As a result, the authors concluded that the effect of crankshaft offset on piston friction could not be explained only by its effect on the piston side force. In accordance with the measurement results, crankshaft offset changed piston slap motion. Hence, the conditions of piston skirt contact and oil film development changed in addition to the change in the piston side force and affected the piston friction characteristics

Notes:

Vendor supplied data

Publisher Number:

2000-01-0922

Access Restriction:

Restricted for use by site license