U.S. patent application number 11/898216 was filed with the patent office on 2008-03-13 for device for after-treatment of exhaust gases from internal combustion engines.
Invention is credited to Bernd Fuhrmann, Andreas Steigert, Thomas Weidner.
Application Number | 20080060353 11/898216 |
Document ID | / |
Family ID | 37650835 |
Filed Date | 2008-03-13 |
United States Patent
Application |
20080060353 |
Kind Code |
A1 |
Steigert; Andreas ; et
al. |
March 13, 2008 |
Device for after-treatment of exhaust gases from internal
combustion engines
Abstract
Ceramic support bodies for the after-treatment of exhaust gases
of internal combustion engines is provided. On a jacket of the
support body heat-resistant elevations are subsequently applied
that fix the bed against movement.
Inventors: |
Steigert; Andreas;
(Lambrecht, DE) ; Weidner; Thomas; (Edenkoben,
DE) ; Fuhrmann; Bernd; (Harthausen, DE) |
Correspondence
Address: |
MG-IP Law, PLLC
P.O. BOX 1364
FAIRFAX
VA
22038-1364
US
|
Family ID: |
37650835 |
Appl. No.: |
11/898216 |
Filed: |
September 10, 2007 |
Current U.S.
Class: |
60/311 |
Current CPC
Class: |
F01N 2350/04 20130101;
F01N 3/2853 20130101; F01N 3/0211 20130101; Y02T 10/12 20130101;
Y02T 10/20 20130101 |
Class at
Publication: |
060/311 |
International
Class: |
F01N 3/021 20060101
F01N003/021 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 8, 2006 |
DE |
DE 202006013789 |
Claims
1. A device for aftertreatment of exhaust gases of internal
combustion engines, the comprising: an active ceramic support body;
a bed mat; and a housing; wherein a jacket of the support body has
temperature-resistant elevations that are subsequently applied.
2. The device according to claim 1, wherein the elevations have a
baked-on ceramic.
3. The device according to claim 1, wherein the elevations are
annular.
4. The device according to claim 1, wherein the elevations are
punctiform.
5. The device according to claim 4, wherein the bed mat has
recesses that correspond with the elevations.
6. The device according to claim 1, wherein the housing has
recesses that correspond with the elevations.
7. A device for treating exhaust gases of a vehicle, the device
comprising: a ceramic support body having a plurality of
honeycomb-shaped channels formed therein; a bed mat substantially
circumscribing the ceramic support body; and a plurality of
engagement devices provided on the ceramic support body for fixedly
supporting the bed mat to an outer surface of the ceramic support
body, thereby preventing movement between the bed mat and the
ceramic support body.
8. The device according to claim 7, wherein the engagement devices
are punctiform elevations that are provided on the ceramic support
body such that the punctifom elevations correspond to a plurality
of apertures provided in the bed mat for fixedly supporting the bed
mat.
Description
[0001] This nonprovisional application claims priority under 35
U.S.C. .sctn. 119(a) to German Patent Application No. 20 2006 013
789, which was filed in Germany on Sep. 8, 2006, and which is
herein incorporated by reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to devices for the
after-treatment of exhaust gases from internal combustion
engines.
[0004] 2. Description of the Background Art
[0005] In exhaust gas catalysts or soot particle filters, which use
a ceramic support body, are held in a housing with the aid of a bed
mat. This bed mat has the task of balancing out the differences in
thermal expansion of ceramic and metal as a result of the
distinctly different expansion coefficients. Special materials that
expand upon heating are used as bed mats.
[0006] Nevertheless it is often observed in practice that the
ceramic support body and/or the bed mat moves within the housing
under the influence of pulsating exhaust gases. This is
unsatisfactory. Therefore, attempts have been made to prevent these
movements by means of terminal rings made of wire or sheet metal.
Aside from the fact that these additional measures represent an
additional expense, they have not been successful in practice.
SUMMARY OF THE INVENTION
[0007] It is therefore an object of the present invention to
provide a device so that movements of support bodies and/or bed
mats relative to one another or to the housing can be reliably
prevented.
[0008] Via elevations in accordance with an embodiment of the
invention, the otherwise smooth jacket surface of the ceramic
support body is modified to such an extent that a force-locking or
form-locking connection takes place between the support body and
the bed mat. In this way, relative movements of the two are
prevented.
[0009] Advantageously, these elevations can include baked-on
ceramic. These can either already be placed on a green blank or
subsequently applied to a baked blank, preferably using
stencils.
[0010] According to an embodiment of the invention, these
elevations are annular. In particular, two parallel rings can be
recommended, between which the bed mat is fixed immovably and
protected from the pulsations.
[0011] According to an alternative embodiment, the elevations can
be punctiform.
[0012] In this case it is advisable to incorporate into the bed
mats recesses that correspond to the elevations. In this manner it
is possible to prevent the support body and bed mat from performing
any further relative movements with respect to one another.
[0013] To also rule out any relative movement between the housing
and bed mat or support body, according to a further embodiment of
the invention, the housing in turn may have recesses that
correspond to the elevations on the support body.
[0014] Further scope of applicability of the present invention will
become apparent from the detailed description given hereinafter.
However, it should be understood that the detailed description and
specific examples, while indicating preferred embodiments of the
invention, are given by way of illustration only, since various
changes and modifications within the spirit and scope of the
invention will become apparent to those skilled in the art from
this detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The present invention will become more fully understood from
the detailed description given hereinbelow and the accompanying
drawings which are given by way of illustration only, and thus, are
not limitive of the present invention, and wherein:
[0016] FIG. 1 illustrates a ceramic support body with annular
elevations; and
[0017] FIG. 2 illustrates a support body with punctiform
elevations.
DETAILED DESCRIPTION
[0018] FIG. 1 shows a first example embodiment. A ceramic support
body 1 is recognizable, with a plurality of honeycomb-like
channels, which for example are catalytically coated. On the jacket
of the support body 1, a bed mat 2 is wound. To reliably prevent
relative movement between the support body 1 and bed mat 2 from
occurring, two annular elevations 3 are applied to the jacket of
the support body 1. These have a heat-resistant material,
especially baked-on ceramic, and fix the bed mat 2 in a
form-locking way.
[0019] FIG. 2 shows an alternative exemplified embodiment. To the
jacket surface of the ceramic bed mat 1, punctiform elevations made
of ceramic are applied. The corresponding bed mat 2 has recesses 5,
which correspond with the punctiform elevations 4. In this way, a
form-locking connection is formed between the support body 1,
elevations 4 and bed mat 2 or recesses 5, preventing relative
movement.
[0020] To also prevent relative movement between the support body 1
and bed mat 2 on one hand, and the catalyst housing (not shown) on
the other, the housing may be equipped in an area of its jacket
with recesses that correspond to the elevations 3, 4. Catalyst
housings with circumferential fins, which fit with the annular
elevations 3 can be used without modification.
[0021] The invention being thus described, it will be obvious that
the same may be varied in many ways. Such variations are not to be
regarded as a departure from the spirit and scope of the invention,
and all such modifications as would be obvious to one skilled in
the art are to be included within the scope of the following
claims.
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