| 摘要 |
PURPOSE:To improve the engine efficiency by forming two closed spaces in a lubricating oil feeding device installed in a crank chamber and allowing one closed space to communicate to the back side space of a piston. CONSTITUTION:A lubricating oil feeding device 101 is formed in a lubricating oil chamber 34 in a crank chamber 3. The container body 102 of the device 101 is divided into two closed spaces 104 and 105 by a diaphragm 103. One closed space 104 is allowed to communicate to the back side chamber of an expansion/compression piston, and check valves 107 and 108 are connected to the other closed space. Lubricating oil is supplied by utilizing the pressure variation in a piston back side chamber. Therefore, the engine efficiency can be improved by effectively utilizing the pressure variation.
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