Lightweight of a diesel piston

Piston (10) for an internal combustion engine with a piston head (22), a cylindrical piston head (11), which adjoins the piston head (22) and an at least partially hollow piston shaft (40) attached to the piston head (11) on the the piston head (22) side facing away is formed and which has two opposite shaft wall portions (50) and two opposite, the shaft wall portions (50) connecting the connecting walls (60), wherein the connecting walls (60) each have a pin bore (61), wherein the piston head (11) an annular cooling channel (18) with at least one inflow opening (28) and at least one outflow opening (30), and the two shaft wall sections (50) respectively so to the piston head (11) towards broaden that the sector length (L1) of is formed on the piston head (11) side of the shaft wall portion (50) is greater than the sector length (L2) of the side of the end wall portion (50) of the piston head (11) facing away.