Patent ID: 7850436

Claim:
A fixing structure for fixing an upper cup muffler having an upper surface opening and a lower surface opening and the upper cup muffler covering a discharge port provided to an upper bearing portion for sealing an opening of an upper cylinder in a hermetically sealed compressor that includes a rotationally compressing element, wherein the upper bearing portion includes a step portion having an upper surface, a lower surface, a side surface between the upper and lower surfaces, and a peripheral edge portion between the upper and side surfaces of the upper bearing portion declined outwardly to have a slant surface, and the upper cup muffler includes a top and a bottom surface and a peripheral side surface lower portion that extends downwardly from an outer peripheral edge portion of the top and bottom surface of the upper cup muffler and forms the lower surface opening, and bolt means extending through the bottom surface of the upper cup muffler for exerting downward force on said upper cup muffler, the peripheral side surface lower portion being sized and positioned to engage said slant surface and flex outwardly as said downward force is applied to sealingly engage at least one of the side surface and the lower surface of the step portion when the bottom surface of the upper cup muffler and the upper surface of the upper bearing portion are fixed to each other by said bolt means, thereby sealing the upper bearing portion; wherein the side surface of the step portion of the upper bearing portion has a slant surface having a different slant angle from the slant surface of the peripheral edge portion and the bolt means exerts downward force on the upper cup muffler so as to make the peripheral side surface lower portion of the upper cup muffler come into contact with the slant surface of the peripheral edge portion of the step portion of the upper bearing portion, slide along the slant surface of the peripheral edge portion, get across the boundary between the slant surface of the peripheral edge portion and the slant surface of the side surface and then engage the slant surface of the side surface, thereby fixing the upper cup muffler and the upper bearing portion to each other; and said two slant surfaces constitute an outwardly bent slant surface.