Insulated cover for mixer assembly

A vehicle exhaust component assembly comprising:

• a first exhaust component;
• a second exhaust component downstream of the first exhaust component;
• an injection system configured to inject a reducing agent into engine exhaust gases upstream of the second exhaust component;
• and
• a mixer connecting an outlet of the first exhaust component to an inlet to the second exhaust component, the mixer comprising an outer housing that is configured to direct a mixture of the reducing agent and the engine exhaust gases into the second exhaust component,
• the mixer including at least one insulation feature that is configured to reduce heat lost at the outer housing, and wherein the mixer includes an inner wall spaced from an inner surface of the outer housing, the inner wall directing at least a portion of the mixture of the reducing agent and engine exhaust gases along a gas path into the second exhaust component, and wherein the inner wall is spaced from an inner surface of the outer housing by an air gap, the inner wall providing a surface to direct a substantial amount of the mixture of the reducing agent and engine exhaust gases into the second exhaust component, and including at least one additional gas path directed to a predetermined area of the outer housing to increase heat at the predetermined area, and wherein the at least one insulation feature comprises the insulating air gap.

A vehicle exhaust component assembly comprising:

• a first exhaust component;
• a second exhaust component downstream of the first exhaust component;
• an injection system configured to inject a reducing agent into engine exhaust gases upstream of the second exhaust component;
• and
• a mixer connecting an outlet of the first exhaust component to an inlet to the second exhaust component, the mixer comprising an outer housing that is configured to direct a mixture of the reducing agent and the engine exhaust gases into the second exhaust component, the mixer including at least one insulation feature that is configured to reduce heat lost at the outer housing, and wherein the mixer includes an inner wall spaced from an inner surface of the outer housing, the inner wall directing at least a portion of the mixture of the reducing agent and engine exhaust gases into the second exhaust component, and wherein the inner wall is spaced from the inner surface of the outer housing to split an exhaust gas flow path into a first flow path that inboard of the inner wall and a second flow path that is outboard of the inner wall, and wherein the at least one insulation feature comprises exhaust gases flowing through the first flow path to heat the inner wall.

A vehicle exhaust component assembly comprising:

• a first exhaust component comprising at least one of a DPF or DOC;
• a SCR catalyst downstream of the first exhaust component;
• an injection system including a doser configured to inject a reducing agent into engine exhaust gases upstream of the SCR catalyst;
• and
• a mixer connecting an outlet of the first exhaust component to an inlet to the SCR catalyst, the mixer comprising an outer housing that is configured to direct a mixture of the reducing agent and the engine exhaust gases into the second exhaust component, and wherein the outer housing comprises an enclosed end and an open end opposite the enclosed end, the open end including both a connection to the outlet of the first exhaust component and the inlet to the second exhaust component such that the outer housing comprises a common end cap cover for both the first and second exhaust components, and wherein the outer housing has a doser opening for the doser that is in an upstream portion of the outer housing such that the doser opening faces the outlet of the first exhaust component, and the mixer including at least one insulation feature that is configured to reduce heat lost at the outer housing.

A vehicle exhaust component assembly comprising:

• a first exhaust component;
• a second exhaust component downstream of the first exhaust component;
• an injection system configured to inject a reducing agent into engine exhaust gases upstream of the second exhaust component;
• and
• a mixer connecting an outlet of the first exhaust component to an inlet to the second exhaust component, the mixer comprising
• an outer housing that is configured to direct a mixture of the reducing agent and the engine exhaust gases into the second exhaust component, and wherein the outer housing comprises an enclosed end and an open end opposite the enclosed end, the open end including both a connection to the outlet of the first exhaust component and the inlet to the second exhaust component such that the outer housing comprises a common end cap cover for both the first and second exhaust components, and wherein the outer housing has an injection opening for the injection system that is in an upstream portion of the outer housing, and
• an inner wall spaced from an inner surface of the outer housing to provide a first exhaust gas flow path that is inboard of the inner wall and a second exhaust gas flow path that is outboard of the inner wall.