Federal-mogul World Wide, Inc.

Alan S Brown

Xiluo Zhu

Miguel Azevedo

Walter Joseph Griffiths

Duraid Mahrus

Xilou Zhu

A heavy duty diesel piston includes upper and lower portions joined across a friction weld and internally contoured to provide a dual gallery structure including an outer annular gallery and a central gallery joined by passages for communicating cooling oil therebetween. The dual-gallery structure allows oil to enter from the outer gallery, which is formed by the circumferential annular recess in the crown and crown bottom, into the central gallery to cool the piston and particularly the central crown region exposed to hot combustion gases. The friction weld provides high structural integrity and minimizes the number of manufacturing steps needed to attach the crown to the crown bottom.

Dual gallery piston

A heavy duty diesel piston includes upper and lower portions joined across a friction weld and internally contoured to provide a dual gallery structure including an outer annular gallery and a central gallery joined by passages for communicating cooling oil therebetween. The dual-gallery structure allows oil to enter from the outer gallery, which is formed by the circumferential annular recess in the crown and crown bottom, into the central gallery to cool the piston and particularly the central crown region exposed to hot combustion gases. The friction weld provides high structural integrity and minimizes the number of manufacturing steps need to attach the crown to the crown bottom.

A piston ( ) for an internal combustion engine includes an upper crown ( ) and a lower crown ( ) that are each fabricated using a same strong material, such as steel and fastened together using a plurality of fasteners ( ). The piston ( ) provides increased strength resulting in improved design flexibility and smaller sized engines that produce the same amount of power. Piston ring grooves ( ) are also provided in either one or both of the upper and lower crowns ( ) which control piston combustion height. A deeper combustion bowl ( ) is also available with the piston ( ).

Bolted articulated piston

A piston (,) for an internal combustion engine includes an upper crown (,) and a lower crown (,) that are each fabricated using a same strong material, such as steel and fastened together using a plurality of fasteners (,). The piston (,) provides increased strength resulting in improved design flexibility and smaller sized engines that produce the same amount of power. Piston ring grooves (,) are also provided in either one or both of the upper and lower crowns (,) which control piston combustion height. A deeper combustion bowl (,) is also available with the piston (,).

A piston (20) for an engine having a crown portion (22) that contains a generally closed cooling chamber (58) that communicates with a cooling fluid source by a cooling bore (74) formed in a pin ear (60, 62). A tube portion (80) is located along the cooling bore (74) and cooperates with the cooling bore (74) to provide a continuous inlet passageway (88) to the cooling chamber (58).

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Sumter, SC, United States of America

Alan S Brown