End cone assembly, exhaust emission control device and method of making thereof

摘要

An end cone assembly for an exhaust emission control device includes an inner cone spacedly disposed within an outer cone. The outer cone comprises a small outer cone end a large outer cone end and an outer wall that diverges from the small outer cone end to the large outer cone end. The inner cone comprises a small inner cone end and a large inner cone end with an inner wall having a first diameter proximal the first inner cone end, wherein the inner wall diverges to a second diameter, wherein the second diameter is disposed proximal a recessed portion having a third diameter at the second inner cone end, and wherein the first diameter is smaller than the third diameter and the third diameter is smaller than the second diameter. The outer wall is disposed in a spaced relation to at least a portion of the inner wall, and, with the exception of the recessed portion, the space between the inner and outer walls is free of insulating material. Disposed within the recessed portion of the inner cone is an insulating member.