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:
Jun. 18, 1991
Filed:
Jun. 07, 1990
Pao C Pien, Marco Island, FL (US);
Other;
Abstract
A primary low viscosity fuel and a secondary high viscosity fuel are fed to an injection pump including a plunger which reciprocates and rotates within a bore in a pump housing. The upper end of the plunger defines with the upper end of the bore a mixing chamber. The mixing chamber is connected through a check valve with a fuel injector for injecting mixed fuel into the combustion chamber of an engine. The plunger has a helical groove thereon which is in communication with the mixing chamber. Primary fuel is fed directly into the mixing chamber. The secondary fuel is fed into an annular groove which is in communication with the mixing chamber through a passage formed in the plunger. The high viscosity secondary fuel in the annular groove forms a seal between the plunger and the wall of the bore to prevent the low viscosity primary fuel from leaking past the seal.