| 摘要 |
PURPOSE:To feed an engine with proper amount of lubricating oil according to the operational condition of the engine by providing a circulating path extending from an oil tank, through a membrane type oil pump and an oil measuring mechanism, to an oil pressure stabilizing mechanism, in a two-cycle internal combustion engine. CONSTITUTION:Lubricating oil of an oil tank 43 is fed to an oil pressure stabilizing mechanism D by a membrane type oil pump B. In the mechanism D, when negative pressure in an intake passage 39 of a carburetor A acts upon a membrane type pressure controlling valve 4 via a passage 36 and the pressure of a passage 13 becomes high, a valve 34 opens so that oil in the passage 13 is returned to the oil tank 43 via a passage 25. Meanwhile, a needle valve 3 of an oil measuring mechanism C is driven by a camshaft 23 which is interlocked with a throttle valve 41 to adjust the passage area of a slit 9. Lubricating oil which flows from the passage 13 into the oil measuring mechanism C is controlled by the slit 9 according to the operational condition of an engine, so that proper amount of the lubricating oil is fed to the intake passage 39 of the carburetor A via a passage 38. Therefore, oil consumption is cut down, while work environment is improved because there is a little exhaust smoke at the time of low load operation. Miniaturization and lightening can be realized with a simple structure. |
