Ultra-precise composite engine cylinder body

The utility model discloses an ultra-precise composite engine cylinder body. The cylinder comprises a cylinder body and a cylinder sleeve, a mounting hole is formed in the middle of the cylinder body;convex rings are arranged at the lower ends of the mounting holes; a fixed ring is arranged at the bottom of the convex ring; a plurality of fixing tables are symmetrically arranged on the inner wallof the upper end of the mounting hole; positioning groove is formed in the fixing table, a kidney-shaped hole is formed in the middle of the fixing table. A support ring is arranged at one end of thecylinder sleeve; the periphery of the cylinder sleeve is further provided with a plurality of protrusions corresponding to the positioning grooves. The cylinder sleeve is inserted into the mounting hole; the supporting ring is in interference fit with the fixing ring; each bulge is inserted into the corresponding positioning groove; a seal is also arranged at the joint of the convex ring and thecylinder sleeve; a liquid st