Compressor comprising an upper shell and a lower shell wherein the upper shell comprises an upper protrusion comprising a first protrusion and a second protrusion comprising a transition and an approximately flat shape

A compressor comprising:

• an upper shell and a lower shell forming an exterior of the compressor;
• and
• a coupling portion provided between the upper shell and the lower shell and configured to:
• protrude from a side surface of the upper shell to an outside of the lower shell, or a side surface of the lower shell to an outside the upper shell,
• wherein the coupling portion comprises:
• a flange portion protruding on the outside of the lower shell or the outside of the upper shell, and
• at least one coupling protrusion configured to protrude further outside from the side surface of the upper shell or the lower shell than the flange portion, to increase a rigidity of the flange portion and the coupling portion, and wherein the upper shell comprises an upper protrusion extended from the at least one coupling protrusion to the upper shell, the upper protrusion forming a portion of the exterior of the compressor, and the upper protrusion comprises a first protrusion and a second protrusion comprising a transition and an approximately flat shape, and the first protrusion has a radius greater than a radius of the transition in the second protrusion.