Expansible chamber devices – Piston – Open-ended hollow skirt type
Reexamination Certificate
2005-03-01
2005-03-01
Lazo, Thomas E. (Department: 3745)
Expansible chamber devices
Piston
Open-ended hollow skirt type
C092S238000
Reexamination Certificate
active
06860190
ABSTRACT:
An engine piston has a crown portion generated about a longitudinal piston axis and, extending axially form the crown, a pair of gudgeon pin bosses defining a pin axis and spaced apart at opposite sides of an orthogonal thrust axis. A circumferentially discontinuous skirt defines lateral thrust and non-thrust bearing regions, respectively, centered on the thrust axis, each joined by convexly bowed reinforcement ribs to the bosses. The bearing region on the non-thrust side of the piston is circumferentially shorter than thrust region, reducing piston mass to one side of the piston, and the reinforcement ribs are offset in pin axis direction where they intersect the bosses. Mass reducing recesses are formed in the underside of the crown between the unskirted periphery reinforcement ribs and bosses, the offset ribs permitting the recesses to extend further and to permit greater reduction in mass. The asymmetry of mass reduction permits the bosses and pin axis to be offset toward the thrust region while having the center of mass of the piston acting through or near the pin axis.
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Allan Stuart Andrew
Oversby Graham
Federal-Mogul Bradford Limited
Howard & Howard
Lazo Thomas E.
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