Patent ID: 7350498

Claim:
A crankshaft equipped in an engine, comprising: an oil passage through which oil is drawn from a crank journal of the crankshaft to a crank pin of the crankshaft; wherein the oil passage has an inlet formed at a peripheral region of the crank journal, and when a plane including a center axis of the crank journal and a center axis of the crank pin crosses a peripheral surface of the crank journal at two cross points in a cross-section perpendicular to the center axis of the crank journal, the inlet is located to be spaced apart in an opposite direction to a rotational direction of the crank journal from a journal side cross point which is one of the two cross points of the crank journal, the journal side cross portion being located on an opposite side of the crank pin with respect to the center axis of the crank journal; wherein the oil passage is configured to extend to be spaced apart from the center axis of the crank journal as seen from a direction of the center axis of the crank journal, and wherein the inlet of the oil passage is configured to have an opening direction inclined in the rotational direction of the crank journal at the inlet, with respect to a radial direction of the crank journal from center axis of the crank journal toward the inlet; and wherein the oil passage is configured to extend in a straight line shape from the inlet to an outlet formed at a peripheral region of the crank pin.