| 摘要 |
PURPOSE:To prevent an intake valve from being unevenly worn by holding fixedly a valve seat fixing portion of a shroud on a mounting seat of a valve seat ring with the valve seat ring. CONSTITUTION:A shroud 2 is provided with a baffle board portion 2a and a valve seat fixing portion 2c formed of a thin plate integrally. Said valve seat fixing portion 2c is held fixedly on a mounting seat 5 of a valve seat ring 4 with the valve seat ring 4. Since the shroud 2 is provided on an intake port 1, a stopper for prevent an intake valve 3 from rotation is not needed. Thus, the intake valve 3 can be prevented from being unevenly worn.
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