Patent ID: 6938604

Claim:
A cooling channel cover for a one-piece piston of an internal combustion engine, the piston having a closed cooling channel that runs around inside a piston crown, at the level of a piston ring band, and a ring-shaped recess provided between the piston ring band and the piston shaft, wherein the piston shaft is connected with the piston hubs suspended on the piston crown, the cooling channel comprising a one-piece, plastic ring having the following features: a U-shaped cross-section; radially angled outer and inner shanks disposed around a circumference of the ring; at least one film hinge running around the circumference of the ring, wherein the film hinge allows at least one radial deflection of at least one of the shanks, in such a manner that the shanks are adapted to engage in a stepped conical recess on an inner edge of the cooling channel in order to close off the cooling channel.