CRANKSHAFT AND OIL FILM JOURNAL BEARING ANISH GANESH

OBJECTIVES To Introduce the topics of: Crankshaft Oil Film Bearing Journal Operation of the mechanism Problems of the Mechanism

CRANKSHAFT The crank shaft turns the piston's up and down motion into circular motion This provides effective torque at the crankshaft's end The material of the crankshaft depends on the load it has to bear

OIL FILM JOURNAL BEARING Thin layer of lubricant between parts, preventing metal-to-metal contact. The type of bearing used depends upon the load on the bearing: low load: soft bearing high load: hard bearing

OPERATION OF THE MECHANISM Oil is pumped in to the crankshaft bearing through the oil inlet and forms a film around the shaft This prevents the contact between the crankshaft and the bearing case

PROBLEMS WITH THE MECHANISM Cavitation Erosion: Erosion on the bearing surface caused by: Heat, pressure, chemical attack, abrasion and loss of lubrication. Misalignment of the crankshaft with in respect to the crankcase and the oil film bearing.

REFERENCES http://www.wartsila.com/Wartsila/docs/en/power/media_publications/brochures/engines/w46_tr.pdf http://www.aa1car.com/library/ar797.htm http://www.hastingsmfg.com/Service%20Tips/factors_influencing_oil_control.htm#Crankshaft%20and%20Bearings http://www.tuninglinx.com/html/crankshaft.html