Patent ID: 7077096
Filing Date: 2006-07-18
Classification: F01M,F01P

Abstract:
1. A multi-cylinder engine wherein, in a crankshaft on which a plurality of crank journals are individually rotatably supported through main metal bearings on a plurality of bearing portions provided on a crankcase and crankpins to which major end portions of connecting rods are pivotally connected are provided integrally, crankpin oil paths for supplying lubricating oil between said major end portions of said connecting rods and said crankpins, wherein: the pair of outermost crank journals disposed most outwardly along an axial line of said crankshaft from among said plurality of crank journals have a length in the axial direction set greater than the length of the remaining crank journals in the axial direction; annular grooves being provided on inner circumferences of the main metal bearings interposed between the outermost crank journals and front and rear bearing portions; and said crankpin oil paths extending from at least one of the two outermost crank journals to said crankpins are provided in said crankshaft while an oil supply source is connected to said crankpin oil paths at least at one of said outermost crank journals.