Internal-combustion engines – Particular piston and enclosing cylinder construction – Piston
Reexamination Certificate
2008-03-11
2008-03-11
McMahon, Marguerite (Department: 3747)
Internal-combustion engines
Particular piston and enclosing cylinder construction
Piston
C092S187000, C092S208000, C092S255000
Reexamination Certificate
active
10343499
ABSTRACT:
An engine piston is manufactured by assembling an outer shell, comprising a crown and tubular side wall in which a ring groove region and skirt are defined, with a plate-like mounting member and bonding them together by brazing or welding. The mounting member is located within the tubular side wall displaced axially from the crown and is bonded near, but displaced radially from, its centre to the crown and at its periphery to the side wall at the end of the ring groove region. The mounting member carries gudgeon pin boss means facing away from the crown. The outer shell is formed by extrusion or the like that permits minimal wall thickness and the bonded structure is of light weight but great strength and stiffness, particularly in the ring groove region. A combustion bowl formed in the crown facilitates bonding to the mounting member and defines with the mounting member an annular cooling chamber adjacent the ring groove region and crown.
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Hume Gillian
Jones Roger James
Parker Duncan
Pindar David Thornton
Tharratt David James
Dickinson Wright PLLC
McMahon Marguerite
Stearns Robert L.
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