CYLINDER-AND-PISTON GROUP Russian patent published in 2012 - IPC F02F1/18 

FIELD: engines and pumps.

SUBSTANCE: cylinder-and-piston group includes a sleeve and piston with piston rings. Grooves are made on working surface of sleeve in opposite direction. Grooves are filled with non-ferrous metal. Grooves are made in the form of closed rings separated from each other. Angle of elevation of the first and the last grooves is in the range of 15…20 degrees, central groove - 40…45 degrees to diametrical plane of the sleeve. Grooves are located on working surface of sleeve from upper dead point to lower dead point.

EFFECT: improving operating quality of cylinder-and-piston group; decreasing friction coefficient between working surfaces of piston rings and sleeve.

2 dwg