Exhaust gas treatment assembly unit

An exhaust gas treatment assembly unit for an exhaust system of an internal combustion engine, the exhaust gas treatment assembly unit comprising:

• a tubular outer housing elongated in a direction of an outer housing longitudinal axis;
• a tubular inner housing elongated in a direction of an inner housing longitudinal axis, wherein an exhaust gas treatment unit is carried in the inner housing;
• and
• a locking fixing device configured to detachably fix the inner housing in the outer housing, wherein the locking fixing device comprises:
• a plurality of locking fixing elements held at the inner housing in both axial directions along the inner housing longitudinal axis, and following one another in a circumferential direction about the inner housing longitudinal axis, each locking fixing element having at least one radially outwards prestressed locking meshing portion;
• and
• a locking receiving area associated with each one of the locking meshing portions and interacting with the locking meshing portions for holding the inner housing in the outer housing in at least one of the two axial directions along the housing outer longitudinal axis, wherein:
• each one of the locking fixing elements comprises a holding area holding the locking fixing element at the inner housing in both axial directions along the housing longitudinal axis, each one of the locking meshing portions of each one of the locking fixing elements projecting radially outwards with respect to the holding area thereof;
• each one of the holding areas comprises two holding sections arranged spaced from one another in the circumferential direction about the inner housing longitudinal axis or along the inner housing longitudinal axis, at least one of the two spaced holding sections comprising a holding element provided integrally at the locking fixing element by an end section of the locking fixing element, which said end section passes through an opening in the inner housing;
• and
• the locking receiving area comprises a radially inwardly open locking depression extending in at least some areas in a circumferential direction about the outer housing longitudinal axis.