Expansible chamber devices – Cylinder detail – Nonmetallic piston contacting portion
Patent
1996-12-18
1999-05-04
Denion, Thomas E.
Expansible chamber devices
Cylinder detail
Nonmetallic piston contacting portion
92 80, 92 82, 921692, 123495, F01B 1102
Patent
active
058991360
ABSTRACT:
An improved plunger and barrel assembly is provided which includes a plunger reciprocally mounted in a cavity formed in the barrel and a leakage flow reduction device positioned in the cavity for reducing fluid leakage flow around the plunger thus increasing system efficiency. The leakage flow reduction device includes a sealing sleeve removably mounted in the cavity between the plunger and the barrel, which includes a bore for slidably receiving the plunger to form an annular clearance gap between the plunger and the bore. The sealing sleeve is designed to resiliently flex in response to fluid pressure forces to reduce the annular clearance gap so as to minimize fluid leakage through the annular clearance gap. The sealing sleeve is formed as a separate piece from the barrel to permit simple, low cost replacement. The sealing sleeve is preferably applied to a fuel pump having a pump plunger for pressurizing fuel in a high pressure chamber.
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Benson Donald J.
Carroll, III John T.
Tarr Yul J.
Brackett Jr. Tim L.
Cummins Engine Company, Inc.
Denion Thomas E.
Leedom Jr. Charles M.
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