Multi-cylinder engine
AssigneeHonda Motor Co., Ltd.
InventorMinoru Matsuda
Life of this patent
Estimating the term…
Abstract
In a multi-cylinder engine, a 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 a reduction in the scale and a reduction in the 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 are 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. 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.
Claims20
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.
A multi-cylinder engine comprising:
- a crankshaft;
- a plurality of crank journals being individually rotatably supported on the crankshaft through main bearings on a plurality of bearing portions provided on a crankcase;
- crankpins pivotally connected to major end portions of connecting rods;
- crankpin oil paths for supplying lubricating oil between said major end portions of said connecting rods and said crankpins;
- a pair of outermost crank journals disposed at each end of the crankshaft along an axial line of said crankshaft as compared to the remaining of said plurality of crank journals each outermost crank journal having a length in the axial direction set greater than the length of the remaining crank journals in the axial direction;
- and
- annular grooves being provided on inner circumferences of the main metal bearings interposed between the outermost crank journals and front and rear bearing portions;
- 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.
Dependencies are inferred from the claim text.