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. 28, 2017
Filed:
Sep. 30, 2015
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi-ken, JP;
Kabushiki Kaisha Toyota Jidoshokki, Kariya-shi, Aichi-ken, JP;
Noriyuki Takada, Susono, JP;
Tsutomu Kawae, Kariya, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi-ken, JP;
Kabushiki Kaisha Toyota Jidoshokki, Kariya-shi, Aichi-ken, JP;
Abstract
An object of the present invention is to improve the exhaust emission for a fuel injection valve having a stepped injection hole constructed so that a small diameter portion and a large diameter portion are communicated with each other with a stepped portion intervening therebetween. The present invention resides in a fuel injection valve comprising a cylindrical nozzle body which has a tip portion formed to have a conical shape, an injection hole which penetrates from an inner circumferential surface to an outer circumferential surface of the nozzle body, the injection hole being constructed so that a small diameter portion, which is positioned on a side of the inner circumferential surface of the nozzle body, is communicated with a large diameter portion which is positioned on a side of the outer circumferential surface of the nozzle body, with a stepped portion intervening therebetween, and a valve plug which is accommodated slidably in the nozzle body and which opens/closes the injection hole, wherein a ratio of the hole diameter of the large diameter portion with respect to the hole diameter of the small diameter portion is not less than 3.1 and not more than 4.0, a ratio of a length of the large diameter portion with respect to a length of the small diameter portion is not less than 0.25 and not more than 0.55, and a ratio of the length of the large diameter portion with respect to the hole diameter of the large diameter portion is not less than 0.4 and not more than 1.6.