Pre-combustion chamber and engine

The utility model discloses a pre-combustion chamber and an engine, the pre-combustion chamber comprises a pre-combustion chamber main body, the lower part of the pre-combustion chamber main body is provided with a plurality of spray holes; a mounting protrusion is arranged on the upper portion of the pre-combustion chamber body, and the top face of the mounting protrusion is an arc face. According to the pre-combustion chamber, the pre-combustion chamber body is simple in structure and suitable for being installed and matched with the pressing block to be arranged on the cylinder cover, and the over-positioning problem is not prone to occurring in the actual connection process. 本实用新型公开了一种预燃室和发动机，所述预燃室，包括：预燃室主体，所述预燃室主体的下部设有若干喷孔；所述预燃室主体的上部设置有安装凸起，所述安装凸起的顶面为圆弧面。本实用新型的预燃室，预燃室主体的结构简单，适于与压块安装配合于缸盖，且在实际连接时，不易出现过定位的问题。