Federal-mogul World Wide, Inc.

Federal-mogul Corporation

Xiluo Zhu

Randall R Gaiser

Alan S Brown

Duraid Mahrus

Eduardo Matsuo

Roberto Bueno Nigro

Richard R Gofton

Eduardo Hiroki Matsuo

A piston for diesel engine applications has a piston body cast entirely of one piece of steel and includes a piston head with a combustion bowl, a ring belt and an oil cooling gallery. A pair of pin bosses and a piston skirt are cast as one piece with the piston head out of the same steel material.

One piece cast steel monobloc piston

A monobloc piston assembly has at least two parts fixedly joined together forming a piston body having an oil cooling gallery. The oil cooling gallery is defined by an upper wall, a lower wall, and a pair of radially spaced inner and outer annular walls. A skirt is formed as one piece and of the same material with at least one of the two parts and depends generally along a longitudinal axis from the lower wall. A pair of pin bosses are spaced laterally from the longitudinal axis and depend generally from the lower wall. At least one elongated opening extends generally between the pin bosses with the opening preferably spanning a substantial portion of the distance between the pin bosses. Oil flows into and out of an oil cooling gallery through the opening.

Monobloc piston having open floor

A monobloc piston has at least two steel parts welded together to define an inner cooling gallery. An outer ring belt is spaced from an inner annular support wall and is joined by a combustion bowl and a lower wall. A pair of pin bosses have axially aligned pin bores. A skirt is formed as one immovable piece with the pin bores. The piston has the following dimensional relationships:

Monobloc piston

A piston ( ) particularly suited for heavy duty diesel engine applications includes upper and lower crown sections ( ) joined by a friction weld ( ) to define an annular ring belt ( ) formed with ring groves ( ) and having a lower end ( ) and an internal piston cooling chamber ( ). A pair of pin bosses ( ) depend from the ring belt ( ) and are formed as one piece with the lower crown section ( ). A skirt ( ) is also formed as one piece with the pin bosses ( ) and has an upper end ( ) that is spaced from the lower end ( ) of the ring belt ( ) to define a space ( ) therebetween which effectively uncouples the skirt ( ) from the ring belt ( ).

Piston having uncoupled skirt

A steel monobloc piston for diesel engines is formed with a relatively short piston skirt whose lower edge resides below the axis of the pin bores of the piston, but located at or above a lowest tangent point of the pin bores. The piston body preferably has a closed oil cooling gallery and the skirt is preferably joined at its upper end to an outer wall of the piston in which a plurality of ring grooves are formed.

Monobloc piston for diesel engines

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 one-piece piston (,) formed by an upper crown (,) and a lower crown (,) having an integral skirt (,). The upper crown (,) includes an upper surface (,) and a lower surface (,). The lower crown (,) includes an upper surface (,) and two pin bosses (,). The upper crown (,) has a first collar (,) and the lower crown (,) has a second collar (,). In addition, skirt ribs (,) connect the two pin bosses (,). The first and second collars (,) are secured together to form the one-piece piston (,).

One-piece integral skirt piston and method of making the same

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).

Growing community of inventors

Ann Arbor, MI, United States of America

Xiluo Zhu