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. 04, 1996
Filed:
Jan. 25, 1995
Frederick A Camplin, Peoria, IL (US);
Jeffrey C Huang, Peoria, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A hydraulically actuated fuel injector includes an intensifier piston with a tapered or conical protuberance and an injector body with a conical seat. During the pre-injection stage, the piston is spring loaded to seat its conical protuberance against the conical seat of the injector body. To start the injection, actuation fluid is admitted to the injector. The injector actuation volume is pressurized and the pressure acts initially only on the top of the conical protuberance of the piston. The displacement of the piston is temporarily retarded during the first stage of injection due to a throttling effect in allowing the high pressure fluid to act on the remaining top surface of the piston. The throttling effect is provided by the relatively narrow flow area between the conical protuberance and the conically shaped seat. The result being that the intensifier piston hesitates in its downward movement such that injection is either slowed or briefly stopped before the piston has moved sufficiently downward that the high pressure actuation fluid acts over the complete top side of the piston. As the conical protuberance of the piston clears its seat, unrestricted main injection begins.