Multi-cylinder engine with crankpin oil paths

Details Multi-cylinder engine with crankpin oil paths Multi-cylinder engine with crankpin oil paths

F - Mech Eng,Light,Heat,Weapons

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F01M 1/06 (2006.01) F01M 1/08 (2006.01) F01M 11/02 (2006.01)

Patent

CA 2473405

In a multi-cylinder engine, decrease of the load capacity of a main metal bearing between a bearing portion of a crankcase and a crank journal is prevented to achieve reduction in scale and reduction in weight of the engine while lubricating oil is supplied between a major end portion of a connecting rod and a crankpin. A pair of outermost crank journals disposed most outwardly along an axial line of a crankshaft from among a 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, and crankpin oil paths extending from at least one of the two outermost crank journals to the crankpins are provided in the crankshaft while an oil supply source is connected to the crankpin oil paths at least at one of the outermost crank journals.

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