Engine fastening structure
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsYoji Utsumi, Masahiro Ito
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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 comprising:
- a cylinder body;
- an aluminum alloy crankcase;
- a crankshaft disposed in the crankcase;
- a bearing bracket made from iron alloy;
- a bearing portion surrounding a journal portion of the crankshaft;
- a bearing collar that is fit into the bearing bracket, is formed as a separate unit from the bearing portion, and holds the bearing portion,
- wherein the bearing bracket comprises a plurality of connecting boss portions extending toward the cylinder body from the bearing portion, the plurality of connecting boss portions being situated on opposite sides of a cylinder axis as viewed in a direction in which the crankshaft extends, and
- connecting bolts screwed into the connecting boss portions to connect the cylinder body to the crankcase.
Dependencies are inferred from the claim text.