Patent ID: 7600465

Claim:
Piston ( 1 ) for an internal combustion engine, consisting of a piston base body ( 2 ) having a piston crown ( 3 ), having pin bosses ( 5 , 6 ) disposed on the side of the piston ( 1 ) facing away from the piston crown ( 3 ), having pin bores ( 7 , 8 ) formed into the pin bosses ( 5 , 6 ), having skirt elements ( 9 , 10 ) that connect the pin bosses ( 5 , 6 ) with one another, having a circumferential region ( 34 ) that proceeds from the piston crown ( 3 ), is disposed radially on the outside, points axially in the pin boss direction, having a circumferential collar ( 12 ) that is disposed at a slight axial distance from the piston crown ( 3 ), formed onto the radial outside of the piston ( 1 ), points radially outward, is at least approximately rectangular in cross-section, which collar has a circumferential outside thread ( 13 ) radially on the outside, the diameter of which is less than the piston diameter, and furthermore having a recess ( 14 ) that follows it on the piston crown side, and furthermore consisting of a ring-shaped groove reinforcement ( 4 ) having a circumferential projection ( 20 ) that follows its face and points radially inward, which is followed, on the pin boss side, by an inside thread ( 19 ) by way of which the groove reinforcement ( 4 ) is screwed onto the outside thread ( 13 ), whereby a contact surface ( 23 ) of the groove reinforcement ( 4 ) that lies on the pin boss side makes contact with a contact surface ( 24 ) that delimits the region ( 34 ) on the pin boss side and thereby closes off the recess ( 14 ) to form a ring-shaped, closed cooling channel ( 21 ), and whereby the ring belt ( 16 ) of the piston ( 1 ) is disposed partly on the radial outside of the groove reinforcement ( 4 ) and partly on the radial outside of the piston ( 1 ) that follows it, on the pin boss side, wherein the collar ( 12 ) has a bend in the pin boss direction radially on the outside, and a radial width that is sufficient for an elastic resilience in the axial direction.