Exhaust gas treatment assembly unit

Patent metadata

Field	Value
Publication number	US-11536179-B2
Application number	US-202016986618-A
Country	US
Kind code	B2
Filing date	Aug 6, 2020
Priority date	Aug 8, 2019
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

An exhaust gas treatment assembly unit for an exhaust system of an internal combustion engine includes a tubular outer housing (12) elongated in a direction of an outer housing longitudinal axis (LA), a tubular inner housing (14) elongated in the direction of an inner housing longitudinal axis (LI), an exhaust gas treatment unit (16) being carried in the inner housing (14), and a locking fixing device (24) detachably fixing the inner housing in the outer housing. The locking fixing device (24) includes a locking fixing element (26) held at the inner housing (14) in both axial directions with a radially outwards prestressed locking meshing area (28). In association with the locking meshing area (28), a locking receiving area (42) at the outer housing (12), interacts with the locking meshing area (28) for holding the inner housing (14) in the outer housing (12) in at least one axial direction.

First claim

What is claimed is:

1. 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.

2. The exhaust gas treatment assembly unit in accordance with claim 1 , wherein:
the locking receiving area comprises a groove locking depression extending without interruptions in a circumferential direction about the outer housing longitudinal axis; or
the locking receiving area comprises a plurality of locking depressions following one another in the circumferential direction about the outer housing longitudinal axis and arranged at circumferentially spaced locations from one another.

3. The exhaust gas treatment assembly unit in accordance with claim 1 , wherein each one of the locking fixing elements comprises a plurality of locking meshing portions spaced from one another in the circumferential direction about the inner housing longitudinal axis.

4. The exhaust gas treatment assembly unit in accordance with claim 1 , wherein the locking fixing element is configured as a shaped sheet metal part.

5. The exhaust gas treatment assembly unit in accordance with claim 1 , wherein each one of the locking fixing element is fixed by a connection in substance at the inner housing in one holding section.

6. The exhaust gas treatment assembly unit in accordance with claim 1 , wherein:
at each one of the holding areas comprising the two holding sections spaced from one another in the direction of the inner housing longitudinal axis, the holding sections extend radially inwards over the inner housing from an outer side thereof and extend behind the inner housing on an inner side thereof, support section provided between the holding sections being supported on the outer side of the inner housing such that the least one locking meshing portion projecting radially outwards for meshing with the associated locking receiving area is provided between the support section and one of the holding sections.

7. The exhaust gas treatment assembly unit in accordance with claim 6 , wherein each holding section comprises:
at least one holding leg extending over the inner housing in an area of a passage opening or in the area of an axial end of the inner housing from radially outwards to radially inwards; and
a holding projection projecting axially with respect to the holding leg and extending behind the inner housing on the inner side thereof.

8. The exhaust gas treatment assembly unit in accordance with claim 6 , wherein the locking fixing element is configured as a shaped sheet metal part.

9. The exhaust gas treatment assembly unit in accordance with claim 1 , further comprising mounting material arranged between the inner housing and the outer housing.

10. The exhaust gas treatment assembly unit in accordance with claim 9 , wherein:
the locking fixing device acts in an axial end area of the inner housing between the inner housing and the outer housing; and
the mounting material is provided at least in another axial end area of the inner housing between the inner housing and the outer housing.

11. The exhaust gas treatment device in accordance with claim 9 , wherein:
the mounting material is held under compression between the inner housing and the outer housing; or
the mounting material comprises wire material; or
the mounting material is held under compression between the inner housing and the outer housing and the mounting material comprises wire material.

12. An internal combustion engine, exhaust system, exhaust gas treatment assembly unit comprising:
a tubular outer housing elongated in a housing longitudinal axis direction;
a tubular inner housing elongated in the housing longitudinal axis direction, wherein the inner housing is configured to carry an exhaust gas treatment unit; and
a locking fixing device configured to detachably fix the inner housing in the outer housing, the locking fixing device comprising:
a locking receiving area configured as a radially inwardly open locking depression extending in at least some areas in a circumferential direction with respect to the housing longitudinal axis; and
a plurality of single piece locking fixing elements, each of the plurality of fixing elements comprising:
a holding area holding the locking fixing element at the inner housing in both axial directions along the housing longitudinal axis and positioning each locking fixing element to follow another locking fixing element in a circumferential direction about the inner housing longitudinal axis, each holding area comprising two holding sections arranged spaced aprat from one another in the circumferential direction about the inner housing longitudinal axis or spaced from one another along the inner housing longitudinal axis, at least one of the two spaced apart holding sections comprising a holding element provided by an end section of the locking fixing element, said end section passing through an opening in the inner housing; and
at least one radially outwards prestressed locking meshing portion, each locking meshing portion acting radially outwards with respect to the holding area thereof and interacting with the open locking depression to hold the inner housing in the outer housing in at least one of the two axial directions along the housing outer longitudinal axis.

Assignees

• Purem GmbH

Inventors

• Datz Wolfgang
• Henzler Markus
• Kast Peter

Classifications

• F01N2450/30

  Removable or rechangeable blocks or cartridges, e.g. for filters · CPC title

• F01N13/1805 Primary

  Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body (pipe joints in general F16L; fixing auxiliaries in motor vehicles in general B60K) · CPC title

• F01N2450/18

  by using quick-active type locking mechanisms, e.g. clips · CPC title

• F01N3/0211

  Arrangements for mounting filtering elements in housing, e.g. with means for compensating thermal expansion or vibration · CPC title

• F01N2450/20

  by mechanical joints, e.g. by deforming housing, tube, baffle plate or parts thereof · CPC title