| 摘要 |
A piston (10) defines a combustion recess which has an opening and at least one chamber having an opening into the combustion recess. The piston comprises a body portion (12) which defines a socket (20) and has a central surface (12c) within said socket defining a portion of said combustion recess. The body portion (12) also has a chamber-defining surface (12d) which extends around said central surface. The piston also comprises a generally annular portion (14) which is received in said socket (20). The portion (14) has a surface (14e) which cooperates with said central surface (12c) in defining the combustion recess, and a chamber-defining surface (14f) which overlies the chamber-defining surface (12d) of the body portion. The chamber-defining surfaces (12d, 14f) cooperate in defining said chamber, and said opening to the chamber is defined by a groove (24) in one of said chamber-defining surfaces. |
