| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem that if a crank journal and a bearing are eliminated for reducing friction loss in a crankshaft structure, it becomes a cause of "deflection" and "torsion", and hence if avoiding this, it leads to a large diameter or a large weight of the crankshaft eventually.SOLUTION: A crankshaft structure includes a crank pin which pivotally supports a large end part of a connecting rod, a crank throw part comprising a crank web connected to both the ends of the crank pin, a crank journal which connects the adjacent crank throw part, and a bearing which pivotally supports the crank journal, wherein the crank pins of the mutual adjacent crank throw part are arranged in the same phase mutually, and in the crank journal which connects the mutual crank throw part, the radius in a direction where the crank pin is provided from the center in a cross sectional shape is shorter than the radius in a direction where the crank pin is not provided from the center. |
