| 摘要 |
PURPOSE:To improve the returning of oil in no relation to a condition or the like of an engine, by utilizing pulsating pressure generated on a crank chamber to flow air and forcibly returning the oil in a rocker chamber through this air flow to the crank chamber. CONSTITUTION:At operation of an engine, when a piston 6 vertically perform reciprocating motion, pulsating pressure due to positively and negatively changing pressure is generated in a crank chamber 3. Both of forcibly returning action of oil and reducing action of blow-by gas are alternately repeated synchronously with the pulsating pressure in said crank chamber 3. In this way, at each time of negative pulsating pressure in the chamber 3, oil in a rocker chamber 13 is forcibly returned to the chamber 3 via a suction passage 23 further dropped and accumulated on an oil pan 7. A period of the pulsating pressure in the chamber 3 is changed in accordance with an engine speed, in case of high speed operation, a large amount of oil can be forcibly returned meetably to an increased quantity of lubricating oil. |
