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US 9,610,633 B2Granted
Crankshaft and method for producing the same
AssigneeHonda Motor Co., Ltd.
InventorsTakayuki Ohnuma, Tsutomu Ando, Yasuhiro Ito
Life of this patent
Estimating the term…
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 crankshaft comprising:
- a crankpin;
- and
- a journal shaft,
- the crankpin comprising:
- a columnar portion having an axis;
- a pair of side surface portions that hold the columnar portion;
- holes having a hollow structure formed in the columnar portion of the crankpin and respectively extending from the pair of side surface portions in an inclined direction with respect to the axis of the columnar portion;
- and
- an oil flow passage formed in an inside of the columnar portion;
- wherein each of the holes is defined by plural surfaces, with one surface of the plural surfaces that is most proximate to the oil flow passage extended in a direction substantially parallel to the oil flow passage, and
- each hole of the holes has a shape that contains a straight line that divides a line segment of a base of the hole in half and is parallel to a side surface of the hole on a cross section containing an axis of the journal shaft and the axis of the columnar portion and passes through a journal shaft side surface of the crankpin.
8 more elements
Dependencies are inferred from the claim text.