Patent ID: 9140177
Filing Date: 2015-09-22
Classification: F02B,F02D,F02M,Y02T

Abstract:
1. A coaxial quill assembly for a dual fuel common rail fuel system comprising: a block defining a liquid fuel passage that opens into a quill chamber through a conical seat, and defines a gaseous fuel passage that opens into the quill chamber outside of the conical seat; an inner tube that defines a liquid fuel conduit extending between a first end and a second end, and the first end including an annular spherical surface resting in contact with, but unattached to, the conical seat; an outer tube with a hollow interior separating a first end from a second end, and the first end being received in the quill chamber; a gaseous fuel conduit extending between an outer surface of the inner tube and an inner surface of the outer tube; an annular seal for preventing gaseous fuel from escaping from the gaseous fuel conduit between the block and the outer tube; an upstream half of the gaseous fuel conduit having a pressure damping chamber with a volume larger than a volume of a downstream half of the gaseous fuel conduit to damp pressure waves arriving from the gaseous fuel passage of the block; and a gage line at the second end of the inner tube extending a predetermined target distance beyond a gage line at the second end of the outer tube so that the inner and outer tubes seat on a common conical seat responsive to a predetermined load on the block along an axis of the inner tube.