Patent ID: 7152569

Claim:
A crankshaft comprising: a crankshaft body defining first and second ends and a rotational axis; a crankshaft journal defined on the crankshaft body, the crankshaft journal being configured to rotationally support a connecting rod; a first main bearing journal defined on the crankshaft body between the first end and the crankshaft journal, the first main bearing journal being configured to permit rotation of the crankshaft body within a crankcase; a second main bearing journal defined on the crankshaft body between the second end and the crankshaft journal, the second main bearing journal being configured to permit rotation of the crankshaft body within a crankcase; a first lubrication inlet positioned on the crankshaft and extending radially inwardly from a first peripheral surface of the crankshaft, the first lubrication inlet and the crankshaft journal being disposed on opposite sides of the first main bearing journal; a second lubrication inlet positioned on the crankshaft, the second lubrication inlet and the crankshaft journal being disposed on opposite sides of the second main bearing journal; a first lubrication outlet positioned at the crankshaft journal; a second lubrication outlet positioned at the crankshaft journal; a first lubrication channel defined by the crankshaft body and extending at least from the first lubrication inlet to the first lubrication outlet; and a second lubrication channel defined by the crankshaft body and extending at least from the second lubrication inlet to the second lubrication outlet.