Pre-combustion chamber mounting structure and engine

The utility model discloses a precombustion chamber installation structure and an engine, the precombustion chamber installation structure comprises a precombustion chamber main body, the precombustion chamber main body is suitable for being installed in a cylinder cover, the upper part of the precombustion chamber main body is provided with an installation bulge, and the top surface of the installation bulge is an arc surface; and the pressing block is fixedly connected with the cylinder cover, the pressing block tightly presses the installation protrusion, and the pressing block and the arc surface form line contact. According to the pre-combustion chamber installation structure, the pre-combustion chamber body is installed in the cylinder cover in the mode that the pressing block presses the pre-combustion chamber body, the design difficulty of the pre-combustion chamber body is simplified, the design cost is reduced, the problem that the stress defect of the contact position of the pre-combustion chamber