ASSEMBLY METHOD OF PISTON-ROD AND PISTON ASSEMBLY Russian patent published in 2013 - IPC F02F3/02 C23C14/24 B82Y40/00 

FIELD: machine building.

SUBSTANCE: piston pin is installed in a piston hole and a piston-rod is installed on the piston pin. First, onto the steel piston pin surface there mechanically applied is mechanically activated powder from material based on nickel with shape memory effect with the particle size of 30-50 mcm by plasma sputtering in vacuum so that a layer 0.2-3 mm thick is obtained. Then, vacuum annealing of the applied layer is performed at the temperature of 500-800°C, thermomechanical treatment is performed at heating to 30 to 250°C or at cooling to -10÷0°C by means of liquid nitrogen and at running-in of the applied layer at that temperature with rollers in radial direction per 50-70 passes with accumulation of deformation degree of ε ≥ 3.7%. Then, after the piston pin is installed into the piston hole, heating of the connection is performed to 20.7-325.8°C of the end of reverse martensitic transformation.

EFFECT: improving strength characteristics of a piston-rod and piston assembly.

6 cl, 1 dwg, 1 tbl, 3 ex