| 摘要 |
A cylinder structure satisfies the following conditions: 12%@d/a@27%, where d is a distance between a cylinder inner surface 12a and an exhaust valve member 20b, and a is a diameter of the exhaust valve member; 40%@c/b@50%, where c is a length of a non-guided portion of the exhaust valve 20 located below a lower end of a sleeve 26 when the exhaust valve 20 is closed, and b is a diameter of a cylinder bore; and 0.5%@e/S@0.8%, where e is a gap between an exhaust valve rod 20a and the sleeve 26 and S is a diameter of the exhaust valve rod 20a. |
