Internal-combustion engines – Particular piston and enclosing cylinder construction
Reexamination Certificate
2009-05-04
2011-11-29
Cuff, Michael (Department: 3783)
Internal-combustion engines
Particular piston and enclosing cylinder construction
C123S041350, C092S208000, C092S231000, C092S214000, C092S224000, C092S186000
Reexamination Certificate
active
08065985
ABSTRACT:
A piston has an upper crown portion with an upper combustion wall against which combustion forces act and a lower crown portion with a pair of pin bosses spaced for receipt of a small end of a connecting rod therebetween. The upper crown portion and the lower crown portion form an outer oil gallery and a central oil gallery in fluid communication with one another. The central oil gallery is formed in part by an annular flange extending radially inwardly from the outer oil gallery and upwardly toward the upper combustion wall to a free edge spaced from the upper combustion wall. The free edge forms an opening about a central axis of the piston and has a non-planar uppermost surface with depressions aligned diametrically opposite one another across the opening to improve the oil flow throughout the central oil gallery.
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Cuff Michael
Dickinson Wright PLLC
Federal-Mogul Corporation
Kim James
Sterns Robert L.
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