Patent ID: 9140174
Filing Date: 2015-09-22
Classification: B01D,F01N

Abstract:
1. An exhaust treatment device, comprising: a housing including an inner shell and an outer shell encapsulating the inner shell; an inlet pipe extending through both the outer shell and the inner shell; an outlet pipe extending through both the inner shell and the outer shell, wherein an exhaust gas enters the exhaust treatment device through the inlet pipe and exits through the outlet pipe; first and second substrates for treating the exhaust gas flowing through the exhaust treatment device, the first and second substrates being coaxially aligned with one another and positioned within the inner shell; a first insulating mat circumferentially surrounding the first substrate; a second insulating mat circumferentially surrounding the second substrate, wherein the inner shell includes a first inner cap coupled to a first end of an inner tube and a second inner cap fixed to a second end of the inner tube, wherein the inner tube includes a first reduced diameter portion engaging the first insulating mat and compressing the first insulating mat between an inner surface of the first reduced diameter portion and an outer surface of the first substrate, wherein the inner tube includes a second reduced diameter portion spaced apart from the first reduced diameter portion and compressing the second insulating mat between an inner surface of the second reduced diameter portion and an outer surface of the second substrate, the first and second reduced diameter portions being positioned inwardly from the first and second ends of the inner tube, the inner tube also including an undeformed central portion between the first and second reduced diameter portions; and insulating material positioned between the inner and the outer shell.