| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce the amount of lubricant flowing out from an oil clearance, and at the same time to suppress damages caused by a foreign matter. <P>SOLUTION: An upper bearing 7 of a crank bearing has an oil hole 77 for supplying external engine oil to the oil clearance, and an oil groove 78 for circulating the engine oil in a circumferential direction. A raised section 7ER not provided with an oil passage is formed at part AR of the oil hole 77 rearward of the inner circumference side opening 77A in the rotation direction of a crankshaft. The oil groove 78 is formed so as to connect between the inner circumferential side opening section 77A of the oil hole 77 and a front side mating face 72F via a front side crash relief 73F and a front side chamfer 74F. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
