Lubricant-cooled and wristpin lubricating piston

Details Lubricant-cooled and wristpin lubricating piston Lubricant-cooled and wristpin lubricating piston

2007-03-20

2010-11-23

Lopez, F. Daniel (Department: 3745)

Expansible chamber devices

With lubricating means

Piston has lubricant retaining or conducting means

Reexamination Certificate

active

07836815

ABSTRACT:
A piston for an internal combustion engine, the engine having a connecting rod coupled to a wristpin, the wristpin being connected to the piston for pivotal movement about an axis, the piston comprising: a top portion and a generally cylindrically-shaped wall portion extending from the top portion, the top and wall portions defining a skirt cavity, the top portion having thereon a downwardly extending projection with a downwardly facing bearing surface for the wristpin, the bearing surface extending in the direction of the axis and defining a portion of a cylinder centered on the axis, and the projection having opposite sides facing the skirt cavity; at least one lubricant passage extending through the projection from one of the opposite sides and over the bearing surface to the other of the opposite sides; and a lubricant opening communicating between the lubricant passage and the bearing surface to supply lubricant to the bearing surface and to the wristpin.

REFERENCES:
patent: 1404621 (1922-01-01), Livingood
patent: 1800077 (1931-04-01), Jennings
patent: 1890914 (1932-12-01), Parsons
patent: 2159989 (1939-05-01), Hazen et al.
patent: 2843433 (1958-07-01), Burnand
patent: 3613521 (1971-10-01), Itano
patent: 4011797 (1977-03-01), Cornet
patent: 4013057 (1977-03-01), Guenther
patent: 4180027 (1979-12-01), Taylor
patent: 4635596 (1987-01-01), Nakano et al.
patent: 6477941 (2002-11-01), Zhu et al.
patent: 6491013 (2002-12-01), Gaiser et al.
patent: 2002/0046593 (2002-04-01), Ribeiro et al.

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