| 摘要 |
<p>The present invention provides a gaseous fuel injection valve comprising a needle valve (10), a seat portion (30) contacting the needle valve (10), a sac portion (32) provided on a lower portion of the seat portion (30), and an injection hole (11) formed in a lower portion of the sac portion (32). The sac portion (32) is formed at no less than a predetermined length so that when the gaseous fuel injection valve (1) is mounted on a cylinder head (C/H) such that the injection hole (11) faces the interior of a combustion chamber (N) of an engine, the seat portion (30) is positioned above the lower surface of the cylinder head (C/H). Further, the fuel injection amount is increased in relation to the lift amount of the needle valve (10) by making the cross section of the seat portion (30) greater than the cross section of the sac portion (32).</p> |
