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:
Mar. 25, 1986
Filed:
Aug. 06, 1984
Yukio Matsui, Yokosuka, JP;
Mitsuo Uchiyama, Yokohama, JP;
Nissan Motor Co., Ltd., , JP;
Abstract
A method of finishing spray-holes bored by machining in the body of a fuel injection nozzle for an IC engine by removing burrs that remain after machining around the inside mouth of each spray-hole. Employed is electrolytic polishing process wherein the nozzle body is made the anode. A tubular electrode having an insulator cover is inserted into the nozzle body, and electrolyte liquid is supplied through the tubular electrode to flow out through the spray-holes. An end portion of the insulator cover completely covers the tip portion of the electrode and comes into close contact with the inner surface of the nozzle body over an area in which the spray-holes are open. In the insulator cover, liquid passages are formed so as to inject the electrolyte liquid only at the location of the mouth of each spray-hole to thereby prevent dissolution of the nozzle body inner surface in unwanted areas. Accordingly the removal of the burrs is achieved without increasing the volume of dead space in the nozzle body.