Patent ID: 9664122
Date: 2017-05-30
CPC Classifications: F02D,F02M,Y02T

Claim:
1. A dual fuel engine comprising: an engine housing defining a plurality of cylinders; a plurality of fuel injectors, each having an injector body that defines a liquid nozzle outlet set and a gaseous nozzle outlet set that open into one of the cylinders, and defines a liquid fuel inlet, a gaseous fuel inlet and a drain outlet, and including a liquid needle valve member that opens and closes the liquid nozzle outlet set, and a gaseous needle valve member that opens and closes the gaseous nozzle outlet set, and including a first electrical actuator operably coupled to the liquid needle valve member, and a second electrical actuator operably coupled to the gaseous needle valve member; a high pressure liquid fuel common rail fluidly connected to the liquid fuel inlet of each of the fuel injectors; a low pressure gaseous fuel common rail fluidly connected to the gaseous fuel inlet of each of the fuel injectors; a drain line fluidly connected to the drain outlet; and each of the fuel injectors includes a drain annulus that surrounds the gaseous needle valve member, and is fluidly connected to the drain outlet.