| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly efficient engine oil lubricant structure recovering and circulating engine oil supplied to each portion of an engine in an early stage. SOLUTION: A crank chamber 40 stores a crankshaft 12 rotatably journaled and a crank web 44 rotated integrally with the crankshaft 12. An oil storage chamber 60 communicates with the bottom of the crank chamber 40 through an opening 61 and is arranged below the crank chamber 40. A clearance between the outer peripheral surface 45 of the crank web 44 and the inner peripheral surface 50 of the crank chamber 40 opposed to the outer peripheral surface 45 is narrowed on an upstream side in comparison with a downstream side with respect to the rotating direction of the crankshaft 12 across the opening 61. COPYRIGHT: (C)2011,JPO&INPIT
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