Crankshaft and method for producing the same
AssigneeHonda Motor Co., Ltd.
InventorsTakayuki Ohnuma, Tsutomu Ando, Yasuhiro Ito
Life of this patent
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Abstract
In a crankshaft 200, one hole 213L formed in a crankpin 213 has a bottom surface having a larger area and a depth from a surface of the crankpin less than those of another hole 213M. In forming the hole 213L and the hole 213M, a preformed product 200 of the crankshaft having a shape smaller than that of a cavity is disposed in a die set and punches are simultaneously inserted into the crankpin 213. By this operation, the hole 213L and the hole 213M are simultaneously formed in each crankpin 213 of the preformed product 200.
Claims5
A method for producing a crankshaft having a crankpin and oil flow passage formed in an inside of the crankpin, the method comprising:
- forming a first hole and a second hole having a hollow structure on a surface of the crankpin;
- and
- forming the oil flow passage in the inside of the crankpin avoiding the first hole and the second hole;
- wherein the first hole and the second hole have plural surfaces, one surface of the first hole, which is most proximate to the oil flow passage, is a bottom surface, one surface of the second hole, which is most proximate to the oil flow passage, is a side surface, and the bottom surface and the side surface are extended in a direction substantially parallel to the oil flow passage.
Dependencies are inferred from the claim text.