Patent ID: 8733326
Filing Date: 2014-05-27
Classification: F02D,F02M,Y02T,Y10T

Abstract:
1. A dual fuel injector comprising: an injector body defining a dual fuel inlet configured to receive a first fuel and a second fuel, a first fuel supply passage, a second fuel supply passage, a first fuel control chamber, a second fuel control chamber, a first fuel control line, a second fuel control line, at least one low pressure drain, a first fuel check cavity and a nozzle having at least one first fuel outlet and at least one second fuel outlet; a first fuel check needle disposed in the first fuel check cavity and movable between a first position wherein the first fuel check needle blocks fluid communication between the first fuel supply passage and the at least one first fuel outlet, and a second position wherein the first fuel check needle at least partially allows fluid communication between the first fuel supply passage and the at least one first fuel outlet, and wherein the first fuel check needle defines an interior cavity; a second fuel check needle positioned within the interior cavity of the first fuel check needle and movable between a first position wherein the second fuel check needle blocks fluid communication between the second fuel supply passage and the at least one second fuel outlet, and a second position wherein the second fuel check needle at least partially allows fluid communication between the second fuel supply passage and the at least one second fuel outlet; a hydraulic lock assembly configured to facilitate fluid communication between the first fuel supply passage and gaseous check cavity; a first fuel control valve assembly disposed at least partially within the injector body and having a control valve member that selectively allow fluid communication between the first fuel control chamber, the first fuel control line and the at least one low pressure drain; and a second fuel control valve assembly disposed at least partially within the injector body and having a control valve member the selectively allows fluid communication between the second fuel control passage and the at least one low pressure drain.