| 摘要 |
PROBLEM TO BE SOLVED: To ensure sufficient supply of lubricating oil to other part such as a cam shaft while strongly cooling a piston. SOLUTION: Lubricating oil is compressed and supplied to a crankshaft bearing 3. In a lubricating oil passage 8, a lubricating oil inlet 11 is disposed to a surface 10 opening to the crankshaft bearing 3 of a balance weight 6, and a lubricating oil outlet 13 is disposed so as to penetrate the balance weight 6 such that the lubricating oil outlet 13 is positioned in a more centrifugal direction of the balance weight 6 than the lubricating oil inlet 11. A lubricating oil leaked from the crankshaft bearing 3 to a balance weight 6 side flows in the lubricating oil inlet 11, flows through the lubricating oil passage 8 by centrifugal force of the balance weight 6 and is blown off from the lubricating oil outlet 13 in the centrifugal direction of the balance weight 6. Accordingly, the lubricating oil is supplied to a piston 5.
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