PISTON COMPRISING A CIRCUMFERENTIAL RADIAL RECESS LOCATED BELOW AN ANNULAR GROOVE

摘要

Disclosed is a piston (1) comprising a top part (2) and an adjacent shaft part (3). The top part (2) of the piston is provided with a field of rings (5) encompassing at least one annular groove (6). A circumferential radial recess (7) is located in the region between the upper edge of the shaft part (3) and the annular groove (6). The upper diameter of said recess (7) is smaller than the lower diameter thereof (7).