INTAKE-EXHAUST DEVICE FOR ENGINE
    50.
    发明专利

    公开(公告)号:JPH0968009A

    公开(公告)日:1997-03-11

    申请号:JP21993895

    申请日:1995-08-29

    Applicant: KUBOTA KK

    Inventor: HAMADA KATSUHIRO

    Abstract: PROBLEM TO BE SOLVED: To provide an intake-exhaust device for an engine improving the intake air quantity and exhaust gas quantity with simple constitution. SOLUTION: An intake-exhaust valve is composed of a double-valve 11 formed of an outer valve member 8 with a vertical hole 26 piercing from a valve stem end part to a valve head bottom face 25, and a core valve 9 fittingly inserted in the vertical hole 26. The lowest end part of the vertical hole 26 of the outer valve member 8 is formed into a passage hole 28 reaching the valve head part bottom face 25. The peripheral surface of the outer valve member 8 has oblique lateral holes 29 communicated with the passage hole 28. The oblique lateral holes 29 and the passage hole 28 are communicated when the outer valve member 8 is moved downward in relation to the core valve 9 at the time of the intake-exhaust valve being put in opening action, and the oblique lateral holes 29 and the passage hole 28 are cut off when the outer valve member 8 is moved upward in relation to the core valve 9 at the time of the intake- exhaust valve being put in closing action. With this constitution, the intake air quantity and exhaust gas quantity are increased respectively at the time of an intake stroke and an exhaust stroke.

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