Patent ID: 7409903
Filing Date: 2008-08-12
Classification: F02F

Abstract:
1. A one-part piston for an internal combustion engine, comprising: a piston crown, two pin boss supports molded onto the piston crown for one pin boss each, wherein the pin boss supports and the faces of the pin bosses are disposed set back relative to a radially outer edge of the piston crown, in a direction of the piston longitudinal axis; two skirt elements that connect the pin bosses, said skirt elements being connected with the piston crown by way of one skirt connection each, wherein recesses are molded into the skirt connections between the skirt elements and the piston crown; a ring-shaped cooling channel disposed in an edge region of the piston crown, a radially outer delimitation of which is formed by a ring wall molded onto the piston crown, and a radially inner delimitation of which is formed partly by the pin boss supports and partly by the skirt connections; a projection that runs around the circumference and is partly molded onto the pin boss supports and partly onto the skirt connections, and is nose-shaped in cross-section; a ring having an essentially cylindrical shape and closing off the cooling channel, said ring having an axially oriented continuous gap forming two joint ends, said ring having a circumferential collar disposed on its outside for closing the cooling channel, said collar forming a snap-in connection with a circumferential groove molded into an inside of the ring wall, wherein the ring makes contact on the projection; and an axially oriented bore made in one of the skirt connections, into which an oil feed pipe is introduced, which pipe opens into the cooling channel, with its upper part, in the region of the ring, wherein the joint ends of the ring make contact with an upper part of the oil feed pipe.