A SYLINDER HAVING CONCAVO-CONVEX ON THE INNER SURFACE THEREOF

摘要

PURPOSE: A cylinder having concavo-convex portions on an inner surface thereof are provided to supply lubricant and collect abrasive particles, since concavo-convex portions are formed on the upper part of an inner wall of a cylinder. CONSTITUTION: A cylinder having concavo-convex portions comprises a piston, a concavo-convex portion of a dashed line groove type. The piston is inserted into the cylinder and is moved. The multiple concavo-convex portions of a dashed line groove type are formed in the inner wall of a cylinder(10). The concavo-convex portion of the dashed line groove type is formed into a micro hole of a concave mirror type. The diameter of the micro hole is 0.07~0.17mm.