The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 22, 2011
Filed:
Mar. 09, 2005
Scott F. Shafer, Morton, IL (US);
Alan R. Stockner, Metamora, IL (US);
Greg W. Hefler, Chillicothe, IL (US);
Chris L. Stewart, Dunlap, IL (US);
Dan Rushton, Peoria, IL (US);
Scott F. Shafer, Morton, IL (US);
Alan R. Stockner, Metamora, IL (US);
Greg W. Hefler, Chillicothe, IL (US);
Chris L. Stewart, Dunlap, IL (US);
Dan Rushton, Peoria, IL (US);
Caterpillar Inc., Peoria, IL (US);
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.