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US 6,182,630 B2Granted
Bolted articulated piston
AssigneeFederal-Mogul World Wide, Inc.
InventorsXiluo Zhu, Duraid Mahrus, Alan S. Brown
Life of this patent
Estimating the term…
Abstract
A piston (20) for an internal combustion engine includes an upper crown (22) and a lower crown (24) that are each fabricated using a same strong material, such as steel and fastened together using a plurality of fasteners (50). The piston (20) provides increased strength resulting in improved design flexibility and smaller sized engines that produce the same amount of power. Piston ring grooves (100, 102, 104) are also provided in either one or both of the upper and lower crowns (22, 24) which control piston combustion height. A deeper combustion bowl (72) is also available with the piston (20).
Claims7
An articulated piston (20) for an internal combustion engine comprising:
- an upper crown (22) having an upper surface (70), a lower surface (82), and an outer sidewall (68) that defines an outer diameter;
- a lower crown (24) having an upper surface (90), a lower surface and an outer sidewall (88) and at least one downwardly projecting pin boss (31) for receiving a wrist pin;
- said upper and lower crowns (22,24) are fabricated from ferrous-based metallic material and are joined together by a plurality of fasteners (50) to form a crown portion and including a separate skirt member (26) fabricated of aluminum-based material coupled in articulated manner to said crown portion;
- said upper crown (22) having a lower (81) surface including a downwardly projecting, generally annular ridge (80) having at least one locating feature (40);
- said lower crown (24) having an upper surface (90) including an upwardly projecting, annular ridge (92) for mating engagement with said upper ridge (80) of said upper crown (22);
- wherein at least one of said upper and lower ridges (80,92) has a boss (32) located adjacent thereto for forming a fastener bore (34,38);
- and
- wherein said boss (32) is located radially outwardly of said at least one of said upper and lower ridges (80,92).
5 more elements
A piston (20) for an internal combustion engine comprising:
- an upper crown (22) having an upper surface (78) defining a combustion bowl (72) and an outer sidewall (68) having a first combustion ring groove (100) located thereon;
- a lower crown (24) having an anular ring member (92) with an outer sidewall (88) and at least one downwardly projecting pin boss (31) for receiving a wrist pin;
- a second combustion ring groove (102) located on said outer sidewall (88) of said lower crown (24);
- an oilscraper ring groove (104) located on said outer sidewall (88) of said lower crown (24);
- said upper and lower crowns (22,24) being fabricated from ferrous-based metallic material and joined together by a plurality of fasteners (50) to form a crown portion and a separate skirt member (26) fabricated of aluminum-based material coupled in articulated manner to said crown portion;
- wherein said upper crown (22) has a lower surface (82) including a downwardly projecting, generally annular ridge (80) having at least one locating feature (40);
- and
- wherein said lower crown (24) has an upper surface (90) including an upwardly projecting, annular ridge (80,92) for mating engagement with said upper ridge (80) of said upper crown (22), at least one of said upper and lower ridges (80,92) has a boss (31) located radially outwardly and adjacent thereto for forming a fastener bore (34,38).
5 more elements
An articulating piston for a large bore internal combustion engine comprising:
- an upper crown (24) having an upper surface defining (70) a combustion bowl (72) and an outer sidewall (68) having a first combustion ring groove (100) located thereon;
- said upper crown (22) further including a lower surface (82) with a downwardly projecting, generally annular ridge (80);
- a lower crown (24) having an annular ring member (92) with an outer sidewall (88) and at least one downwardly projecting pin boss (31) for receiving a wrist pin;
- said lower crown (24) having an upper surface (90) with an upwardly projecting, annular ridge (92) for mating engagement with said upper ridge (80) of said upper crown (22);
- a second combustion ring groove (102) located on said outer sidewall (88) of said lower crown (24);
- an oilscraper ring groove (104) located on said outer sidewall (88) of said lower crown (24);
- said upper and lower crowns (22, 24) being fabricated from steel and joined together by a plurality of fasteners (50) to form a crown portion;
- wherein said upper and lower ridges (80, 92) have a plurality of bosses (32, 36) located radially outwardly and adjacent thereto for forming a plurality of fastener bores (34, 38) for receiving said fasteners (50);
- and
- a skirt (26) for articulating connection to said crown portion.
7 more elements
Dependencies are inferred from the claim text.