METHOD FOR MANUFACTURING CRANK SHAFT OF HERMETIC RECIPROCATING COMPRESSOR

摘要

PURPOSE: A method is provided to reduce weight of the crank shaft and manufacturing procedures, while achieving improved strength of the crank shaft. CONSTITUTION: A crank shaft(40) comprises a main shaft unit(41) where a rotor of a hermetic reciprocating compressor is coupled; and a crank unit(42) arranged eccentrically with respect to the main shaft unit where a connecting rod is connected. The main shaft unit is formed into a hollow pipe, and the crank unit is formed into a sintered form. The end of the main shaft unit is inserted into a circular groove(42d) formed at the coupling surface of the crank unit, and the crank unit are joined with each other through a laser welding process. The hollow pipe and the sintered form are made of an iron based alloy containing carbon 0.5% or lower.