Patent ID: 6928921

Claim:
A small-type refrigerating machine compressor piston which is free from a piston ring groove, with a cylinder-jacket-like sealing and guide surface section as well as at least two substantially bridge- and cylinder-jacket-sector-like sealing and guide surface sections of the piston skirt which have continuous surfaces, are flush with an upper face of the piston, and extend substantially parallel to the direction of movement of the piston occluding in a substantially sealing fashion with the cylinder wall and allowing the guidance of the piston in the cylinder as well as sealing the crankcase relative to the sealing or compression chamber and other sections of the piston skirt comprising a recess, as a result of which there is a distance between piston skirt and cylinder wall, wherein the angle (a) between the connecting lines of the boundary edges of each bridge-like and cylinder-jacket-sector-like sealing and guide surface section, which boundary edges extend in the axial direction of the piston, is smaller than 40°, with the associated rotational axis and the bridge- and cylinder-jacket-sector-like sealing and guide surface sections have different have different depths.