| 摘要 |
PURPOSE:To simplify the structure around a valve by opening/closing a single port opened to a combustion chamber with a poppet valve and switching and communicating intake/discharge passages to the said port with the bulged section of a valve stem. CONSTITUTION:A port 9 opened to a combustion chamber 7 via a single opening is formed, and a discharge passage 11 and an intake passage 10 are opened at the upper section and lower section of this port 9 respectively. A check valve 14 is provided on the discharge passage 11, and a side passage 12 is formed on the port 9. This opening is controlled to be opened/closed by a poppet valve 8A, and the intake passage 10 and discharge passage 11 opened to the port 9 are controlled to be opened/closed by a bulged section 8B formed on a valve stem. The poppet valve 8A is opened at a suction stroke, the discharge passage 11 is closed by the bulged section 8B, and air is sucked from the intake passage 10 through the side passage 12. The intake passage 10 is closed by the bulged section 8B at a discharge stroke. |
