Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2005-03-09
2011-11-22
Huynh, Hai H (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S1960CP
Reexamination Certificate
active
08061328
ABSTRACT:
Mixing of lubrication fluid and pumped fluid within a pump can undermine lubricity of the lubrication fluid and/or contaminate the pumped fluid (e.g. fuel) with lubrication fluid. In order to reduce mixing of fluids within a high pressure pump of the present disclosure, a lubrication fluid is supplied to the high pressure pump. A low pressure pump supplies a second fluid to the high pressure pump. The pressure of the second fluid is increased within at least one piston bore of the high pressure pump. Mixing of the lubrication fluid and the second fluid is reduced by fluidly connecting a weep annulus which is opened to the at least one piston bore to a low pressure pump inlet of the low pressure pump.
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Hefler Greg W.
Rushton Dan
Shafer Scott F.
Stewart Chris L.
Stockner Alan R.
Caterpillar Inc.
Huynh Hai H
Miller Matthias & Hull
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