| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-cylinder engine capable of improving durability of a crankshaft bearing hole. SOLUTION: When providing a side oil pathway 8 extending in a fore and aft direction in a lateral one side of a cylinder block 1, providing a first feed oil pathway 9 branched off from the side oil pathway 8 in a bearing wall 3, communicating a tip of the first feed oil pathway 9 with a bearing hole oil groove 10 formed on an inner circumference face of the crankshaft bearing hole 4, communicating an oil inlet of a bearing metal 5 with the bearing hole oil groove 10, communicating a metal oil groove formed on an inner circumference face of the bearing metal 5 with the oil inlet, providing a second feed oil pathway 13 led out from the bearing hole oil groove 10 in the bearing wall 3, and communicating a lead-out end of the second feed oil pathway 13 with an interlock shaft bearing hole 14 of a rotary interlock shaft provided in a lateral other side of the cylinder block 1, the bearing hole oil groove 10 is formed only on an inner circumference face of an upper half part of the crankshaft bearing hole 4, and an inner circumference face of a lower half part of the crankshaft bearing hole 4 is shaped into an arced curved face without an uneven part. COPYRIGHT: (C)2008,JPO&INPIT
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