| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To enable valve functions of a small valve element which opens/closes a small inlet/outlet to be maintained well with regard to an intake/exhaust valve gear provided with a large inlet/outlet and the small inlet/outlet. <P>SOLUTION: The large inlet/outlet 30 is provided in a lid body 3 that covers the top end of a casing 2. The movement of a large valve element 6 accommodated in such a way as to be movable vertically opens/closes the large inlet/outlet 30 from below. The small inlet/outlet 61 is provided in the large valve element 6. A small valve element 64 opens/closes the small inlet/outlet 61 from below interlocking with the movement of a float 7. The large valve element 6, made by arranging a member of a cylindrical shape having a bottom with its opening facing downward, forms a valve chamber 60 that stores the small valve element 64 in the inside part. The small inlet/outlet 61 opens at the top wall side of the valve chamber 60 and is used as a small valve seat 63. By arranging the small valve seat 63 at a position of a predetermined height or more from the lower opening end position of the valve chamber 60 and by letting the large valve element 6 reserve air of a predetermined amount or more inside the valve chamber 60 to demonstrate buoyancy of a prescribed level or more, the level of water entering the valve chamber 60 is prevented from reaching up to the height of the small valve seat 63. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
