Internal-combustion engines – Particular piston and enclosing cylinder construction – Piston
Reexamination Certificate
2007-01-10
2010-06-08
McMahon, M. (Department: 3741)
Internal-combustion engines
Particular piston and enclosing cylinder construction
Piston
C277S434000
Reexamination Certificate
active
07730866
ABSTRACT:
This device is designed for a piston which is designed to move in alternating linear movement parallel to the axis of a chamber divided by the piston into a high pressure volume and a low pressure volume, and is of the type comprising:a circular cylindrical sliding surface bounding the chamber,an annular groove provided in the piston which is coaxial with the sliding surface and open towards the sliding surface, anda closed resilient sealing ring housed in a leak tight manner in the groove and intended to make sealing contact with the sliding surface.According to one aspect of the invention the ring is designed to determine the size of a lubricating oil film between the ring and the sliding surface to a limit lubricating thickness preferably from 0.1 μm to 1 μm when it moves from the high pressure volume to the low pressure volume.
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Jackson Douglas E.
McMahon M.
Stites & Harbison PLLC
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