| 摘要 |
A bearing structure of a crankshaft is disclosed. The crankshaft is rotatably held by a lower cylinder block portion and a bearing cap arranged below the lower cylinder block portion. Stress relaxation grooves extending along the axis of the crankshaft are formed in upper portions of opposite sides of the bearing cap. The stress relaxation grooves have openings in opposite side surfaces of the bearing cap. By forming the stress relaxation grooves, projecting ends extending along the axis of the crankshaft are formed in the upper portions at the opposite sides of the bearing cap. The projecting ends are flexible in response to load acting on the bearing cap when the crankshaft rotates. |
