Engine fastening structure
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsYoji Utsumi, Masahiro Ito
Life of this patent
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Abstract
An engine fastening structure in which a crankcase and a cylinder body are provided as separate units, so that the crankcase and the cylinder body are connected together with connecting bolts, characterized in that the crankcase 2 is constructed in such a manner that an iron alloy bearing member 12b for supporting a crankshaft bearing is insert cast in an aluminum alloy, and in that connecting boss portions 12c are integrally formed on both sides of the iron alloy bearing member 12b which are situated opposite across a cylinder axis as viewed in a direction in which the crankshaft extends in such a manner as to extend toward a cylinder body side, so that the connecting bolts 30a are screwed into the connecting boss portions 12c, respectively.
Claims10
An engine fastening structure for connecting a cylinder body or a cylinder head via the cylinder body to a crankcase with connecting bolts, characterized in that the crankcase is constructed in such a manner that an iron alloy bearing member for supporting a crankshaft bearing is insert cast in an aluminum alloy, in that the bearing member comprises a bearing portion which surrounds the circumference of a journal portion of a crankshaft, a bearing collar that is formed as a separate unit from the bearing portion, which is inserted into the bearing portion so as to be disposed in place therein and in which the crankshaft bearing is inserted to be fitted, and connecting boss portions which are integrally formed in such a manner as to extend toward a cylinder body side from sides of the bearing portion which are situated opposite across a cylinder axis as viewed in a direction in which the crankshaft extends, and in that the connecting bolts are screwed into the connecting boss portions, respectively.
Dependencies are inferred from the claim text.