Patent ID: 8683913

Claim:
A piston having a piston head, a ring zone and a skirt, consisting of load-bearing skirt wall sections and rear connecting walls which interconnect the skirt wall sections and piston-pin bosses which run on a boss axis set back from a piston axis and which penetrate the rear connecting walls in the vicinity of their peripheral lower edge convexly to an axis and are configured concave in relation to the axis in the area of their upper edge below the ring zone; comprising: a circumferential, free cast, hollowed out area formed in a projection of the ring zone beyond the rear connecting walls radially inward of the ring zone; a reinforced section configured as an insert provided in the vicinity of the piston head running radially between a radially outward extending, open-ended groove in the ring zone configured to receive a piston ring and the hollowed out area; wherein a weight of a volume of piston material represented by the free cast hollowed out area is greater than a weight of the insert the insert including at least one body; and the insert fixed in place by solidified metal melt of the piston.