| 摘要 |
<p>In an internal combustion engine, a piston/cylinder arrangement includes a hemispherical combustion chamber (4) formed either in a piston crown (3) secured to a top of the piston (7) or in the piston head itself. This hemispherical combustion chamber (4) occupies substantially an entirety of the surface area of the upper face of the piston crown or piston (7). A cylinder head extension member (2) extends downwardly into the hemispherical combustion chamber (4) so as to occupy a volume thereof as necessary to increase the compression ratio to a desired value. When the hemispherical combustion chamber (4) is formed in the piston crown, the piston crown (3) is secured to but spaced apart from the piston head (10) so as to insulate the piston crown (3) from the piston head (10). This enables the piston crown (3) to be formed of superior grade metal relative to the piston head (10).</p> |
