DEVICE FOR LAPPING PISTON RING STACK Russian patent published in 1996 - IPC

FIELD: mechanical engineering. SUBSTANCE: device comprises rod 1 and stack of rings 4 secured inside it by way of washers 2 and nut 3. The stack is lapped alternately but during one stroke of piston 1 in cylinders 6 and 8 of two different diameters. The transition regions between the cylinders are made up as trancated cones 7 to provide non-striking transition of piston stack 4 from cylinder 8 of greater diameter to the cylinder 6 of smaller diameter. The angle of inclination of a generatrix of trancated cones 7 does not exceed 1°. The ratio between the heights of greater cylinder 8 and smaller cylinder 6 presented in the invention description. EFFECT: improved quality of lapping. 3 dwg