Title of Invention

METHOD OF PRODUCING AN EXHAUST GAS-CARRYING DEVICE

Abstract The invention relates to a method of producing an exhaust gas-carrying device, comprising at least one insert piece and a cylindrical outer housing (16), which method comprises the following steps: Introducing the insert piece into the outer housing (16) and applying radial forces by means of clamping jaws (18) which bear against the outer surface area of the outer housing (16) and plastically deform the outer housing (16) inwards in order to clamp the insert piece in the outer housing (16). In this arrangement, the clamping jaws (18) are configured such and have edges (20) such that marking lines (22) are formed in the outer housing (16) which do not continuously extend axially parallel to the outer housing (16) along that portion of the outer housing (16) in which the insert piece is arranged.
Full Text PCT/EP2006/000371
ArviMentor Emissions Technolgies GmbH
Our reference: Zeichen: A 2951 WO
Method of Producing an Exhaust Gas-Carrying Device
The invention relates to a method of producing an exhaust gas-carrying
device, comprising at least one insert piece and a cylindrical outer housing, which
method comprises the following steps: Introducing the insert piece into the outer
housing and applying radial forces by means of clamping jaws which bear against
the outer surface area of the outer housing and plastically deform the outer
housing inwards in order to clamp the insert piece in the outer housing.
Moreover, the invention relates to an exhaust gas-carrying device comprising at
least one insert piece and a plastically deformed cylindrical outer housing.
Such a method and an exhaust gas carrying device of this type are known
from prior art (see for instance EP 0 982 480 A2), with the exhaust gas-carrying
device being a catalytic converter, a particle filter for diesel engines or a muffler
of a motor vehicle, for example.
Figure 1 shows a tool which is usually used for clamping an insert piece,
which in the case of a vehicular catalytic converter 10 is formed by a ceramic
substrate 12 and an insulation mat 14, for instance, in an outer housing 16. The
tool has several clamping jaws 18 which are arranged around the substrate 12,
the insulation mat 14 and the outer housing 16. Subsequently the clamping jaws
18 are pressed radially inwards toward the outer housing 16, whereby radial
forces act on the outer surface area of the outer housing 16. Thereby the outer
housing 16 is plastically deformed in inward direction and, hence, the substrate
12 and the insulation mat 14 will be clamped in the outer housing 16. The
clamping jaws 18 have the shape of a hollow cylinder when completely brought
together, the inner diameter of which just equaling the desired outer diameter of
the finished catalytic converter 10.
A disadvantage of the described method of producing an exhaust gas-
carrying device is that the process of moving the clamping jaws 18 towards each

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other results in marking lines in the outer housing 16, which marking lines are
nearby the contact surfaces of the inner longitudinal edges 20 of the clamping
jaws 18 with the outer housing 16 and are formed by the outer housing 16 being
impressed in sections. These inner longitudinal edges 20 extend rectilinearly with
the clamping jaws 18 according to prior art and parallel to the longitudinal axis L
of the outer housing 16, as can be seen particularly well in Figure 2, showing the
developed inner lateral surface of the tool according to prior art.
During the deformation process it may happen that indentations - also
referred to as dents - develop on a portion of the outer housing 16. This risk
exists in particular with outer housings which do not have a circular cross-section,
but an elliptical or an approximately triangular cross-section, for example.
Therefore, it is the object of the invention to provide a method of the type
initially mentioned by means of which an exhaust gas-carrying device can be
produced, the outer housing of which has a higher stability during deformation.
According to the invention, provision is made in a method of the type initially
mentioned in that the clamping jaws are configured such and have edges such
that marking lines are formed in the outer housing which do not continuously
extend axially parallel to the outer housing along that portion of the outer housing
in which the insert piece is arranged. It is by the method according to the
invention that an exhaust gas-carrying device of the type initially mentioned is
produced in which the outer housing has marking lines which do not continuously
extend axially parallel to the outer housing along that portion of the outer housing
in which the insert piece is arranged. Thus, the resulting marking lines have one
or more portions which do not extend axially parallel to the outer housing, which
also means that they comprise several portions which, when seen singularly, are
axially parallel but offset relative to each other. In any case, the marking lines are
not both continuous and continuously axially parallel, whereby the susceptibility
of the outer housing in terms of indentations and dents is remarkably reduced.
By the special orientation of the marking lines the forces applied to the
housing during deformation are transmitted into and distributed in the outer
housing more uniformly. The method according to the invention is distinguished
by a very simple and low-cost applicability, because in the method according to

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prior art ideally only the clamping jaws 18 have to be replaced, while the
remaining production equipment can be maintained.
According to a preferred embodiment the marking lines have at least one
portion which extends obliquely relative to the longitudinal axis of the outer
housing, whereby the outer housing has an enhanced stability during deforming.
The marking lines preferably have at least one axially parallel portion and at
least one portion which extends transverse to the longitudinal axis of the outer
housing, and are brought about by clamping jaws which can be manufactured in
a comparable simple manner.
According to a further embodiment several axially consecutively arranged
groups of marking lines, extending across partial lengths, are formed in the outer
housing, with the marking lines of subsequent groups being offset relative to each
other in circumferential direction. This is achieved, for instance, by the
employment of clamping jaws comprising several sections which are arranged
axially in succession and in each case exhibit longitudinal edges which are axially
parallel to the outer housing, every two consecutive sections being arranged so
as to be offset from one another. Clamping jaws configured in such a manner are
distinguished by a particularly simple and low-cost producibility.
It will be preferred that the opposite longitudinal edges of each of the
clamping jaws extend parallel to each other; advantageously, all clamping jaws
have identical geometries and dimensions. This will result in a set of clamping
jaws which can be interchanged at will, whereby it is possible without difficulty to
keep spare parts in stock, for instance.
Further features and advantages of the invention will be apparent from the
following specification of several preferred embodiments on the basis of the
attached drawing in which:
- Figure 1 is a perspective view of a tool for producing an exhaust gas-
carrying device according to prior art, partially in cross-section;
- Figure 2 is a top view of the developed inner lateral surface of the prior art
tool according to Figure 1;

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- Figure 3 is a sectional view taken through an exhaust gas-carrying device
produced by the method according to the invention;
- Figure 4 is a top view of the developed inner lateral surface of a tool for
performing the method according to the invention, which also corresponds to the
top view of a developed outer housing; and
- Figures 5a to 5h are schematic views of various embodiments of marking
lines which are formed in the outer housing of the exhaust gas-carrying device
during performing the method according to the invention.
Figure 3 shows a sectional view through an exhaust gas-carrying device in
the form of a catalytic converter 10 which has been produced by means of the
method according to the invention. Here too, the outer housing 16 of the catalytic
converter 10 has several marking lines 22, as is known from prior art, which are
formed in that the outer housing 16 is deformed in inward direction only in the
region of the clamping jaws 18 and not between the opposite longitudinal edges
20 of adjacent clamping jaws 18. The marking lines 22 which protrude outwards,
however, do not continuously extend axially parallel to the outer housing 16,
whereby the outer housing 16 during deforming exhibits a lower susceptibility
with respect to indentations and dents.
A possible tool for clamping the ceramic substrate 12 and the insulation mat
14 in the outer housing 16 is illustrated in Figure 4. Again, the tool is a hollow
cylinder made up of several clamping jaws 18, but compared with prior art (see
Figure 2) the longitudinal edges 20 with the clamping jaws 18 according to the
invention do not continuously extend axially parallel to the outer housing 16.
According to the embodiment of the invention shown in Figure 4, the clamping
jaws 18 have an upper portion 18a, a middle portion 18b and a lower portion 18c,
with the middle portion 18b of each clamping jaw being offset to the left with
respect to the upper portion 18a and the lower portion 18c by roughly half the
width of a clamping jaw.
The opposite longitudinal edges 20 of each clamping jaw 18 extend parallel to
each other along the entire length of the clamping jaw 18, and the geometry and
the dimensions are the same for all clamping jaws 18, i.e. they mate with each
other seamlessly in the closed state.

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If one employs the clamping jaws 18, which are illustrated in Figure 4, in the
production of an exhaust gas-carrying device, then several bead-like marking
lines 22a will be formed in its outer housing 16 which are arranged parallel to
each other and extend in the nature of crenellates along the longitudinal axis L of
the outer housing 16, essentially having the shape illustrated in Figure 5a.
Apart from the one-piece form of the individual clamping jaws 18 which is
illustrated in Figure 4, it is likewise conceivable, of course, that each individual
clamping jaw 18 consists of three separate portions 18a, 18b and 18c, which are
arranged so as to be offset in circumferential direction of the outer housing 16.
With the employment of clamping jaws which are configured in such a manner,
several axially consecutively arranged groups of marking lines are formed which
extend across partial lengths, with the marking lines of consecutive groups being
offset from one another in circumferential direction (Figure 5b).
Of course, the clamping jaws 18 may have any other configuration which
results in the formation of marking lines 22 which do not continuously extend
axially parallel to the outer housing 16; some further examples of these are
shown in Figures 5c to 5h. Here too, the shape of the respective longitudinal
edges 20 of the clamping jaws 18 corresponds to the shape of the developing
marking lines.
Thus, marking lines 22c are conceivable which have several axially parallel
portions and several portions which extend obliquely relative to the longitudinal
axis L of the outer housing. It is likewise possible to give the clamping jaws 18
such a design that marking lines are formed which continuously extend obliquely
relative to the longitudinal axis L of the outer housing. In this arrangement, the
marking lines may be diagonal marking lines 22d or angle-forming marking lines
22e.
Besides, Figures 5f to 5h show bow-shaped, approximately S-shaped and
meander-like marking lines 22f to 22h.
It is common to all possible marking lines 22a to 22h, which have been
shown, that they do not continuously extend axially parallel to the outer housing
of the exhaust gas-carrying device.

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Claims
1. A method of producing an exhaust gas-carrying device, comprising at
least one insert piece and a cylindrical outer housing (16), the method comprising
the following steps:
introducing the insert piece into the outer housing (16) and
applying radial forces by means of clamping jaws (18) which bear against
the outer surface area of the outer housing (16) and plastically deform the outer
housing (16) inwards in order to clamp the insert piece in the outer housing (16),
characterized in that the clamping jaws (18) are configured such and have
edges (20) such that marking lines (22) are formed in the outer housing (16)
which do not continuously extend axially parallel to the outer housing (16) along
that portion of the outer housing (16) in which the insert piece is arranged.
2. The method according to claim 1, characterized in that the marking lines
(22c; 22d; 22e) have at least one portion which extends obliquely relative to the
longitudinal axis (L) of the outer housing (16).
3. The method according to claim 1 or claim 2, characterized in that the
marking lines (22a; 22c) have at least one axially parallel portion and at least one
portion which extends transverse to the longitudinal axis (L) of the outer housing
(16).
4. The method according to any of the preceding claims, characterized in
that the marking lines (22a) extend along the longitudinal axis (L) in the nature of
crenellates.
5. The method according to any of the preceding claims, characterized in
that the marking lines (22f) extend in a bow shape with respect to the longitudinal
axis (L).
6. The method according to any of the preceding claims, characterized in
that the marking lines (22g) extend approximately in a S-shape.

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7. The method according to any of the preceding claims, characterized in
that the marking lines (22h) extend in the form of a meander.
8. The method according to any of the preceding claims, characterized in
that several axially consecutively arranged groups of marking lines (22b),
extending across partial lengths, are formed in the outer housing (16), with the
marking lines of subsequent groups being offset relative to each other in
circumferential direction.
9. The method according to any of the preceding claims, characterized in
that the opposite longitudinal edges (20) of each of the clamping jaws (18) extend
parallel to each other.
10. The method according to any of the preceding claims, characterized in
that all clamping jaws (18) have identical geometries and dimensions.
11. An exhaust gas-carrying device, comprising at least one insert piece and
a plastically deformed cylindrical outer housing (16), characterized in that the
outer housing (16) has marking lines (22) which do not continuously extend
axially parallel to the outer housing (16) along that portion of the outer housing
(16) in which the insert piece is arranged.

The invention relates to a method of producing an exhaust gas-carrying
device, comprising at least one insert piece and a cylindrical outer housing (16),
which method comprises the following steps: Introducing the insert piece into the
outer housing (16) and applying radial forces by means of clamping jaws (18)
which bear against the outer surface area of the outer housing (16) and
plastically deform the outer housing (16) inwards in order to clamp the insert
piece in the outer housing (16). In this arrangement, the clamping jaws (18) are
configured such and have edges (20) such that marking lines (22) are formed in
the outer housing (16) which do not continuously extend axially parallel to the
outer housing (16) along that portion of the outer housing (16) in which the insert
piece is arranged.

Documents:

02842-kolnp-2007-abstract.pdf

02842-kolnp-2007-assignment.pdf

02842-kolnp-2007-claims.pdf

02842-kolnp-2007-correspondence others 1.1.pdf

02842-kolnp-2007-correspondence others 1.2.pdf

02842-kolnp-2007-correspondence others 1.3.pdf

02842-kolnp-2007-correspondence others-1.4.pdf

02842-kolnp-2007-correspondence others.pdf

02842-kolnp-2007-description complete.pdf

02842-kolnp-2007-drawings.pdf

02842-kolnp-2007-form 1.pdf

02842-kolnp-2007-form 18.pdf

02842-kolnp-2007-form 2.pdf

02842-kolnp-2007-form 3.pdf

02842-kolnp-2007-form 5.pdf

02842-kolnp-2007-international publication.pdf

02842-kolnp-2007-international search report.pdf

02842-kolnp-2007-others.pdf

02842-kolnp-2007-pct request form.pdf

02842-kolnp-2007-priority document-1.1.pdf

02842-kolnp-2007-priority document.pdf

2842-KOLNP-2007-ABSTRACT.pdf

2842-KOLNP-2007-ASSIGNMENT.1.3.pdf

2842-KOLNP-2007-ASSIGNMENT.pdf

2842-KOLNP-2007-CANCELLED PAGES.pdf

2842-KOLNP-2007-CLAIMS.pdf

2842-KOLNP-2007-CORRESPONDENCE OTHERS 1.4.pdf

2842-KOLNP-2007-CORRESPONDENCE.1.3.pdf

2842-KOLNP-2007-DESCRIPTION (COMPLETE).pdf

2842-KOLNP-2007-DRAWINGS.pdf

2842-KOLNP-2007-EXAMINATION REPORT.1.3.pdf

2842-KOLNP-2007-FORM 1.pdf

2842-KOLNP-2007-FORM 18.1.3.pdf

2842-KOLNP-2007-FORM 2.pdf

2842-KOLNP-2007-FORM 26.1.3.pdf

2842-KOLNP-2007-FORM 3.1.3.pdf

2842-KOLNP-2007-FORM 3.pdf

2842-KOLNP-2007-FORM 5.1.3.pdf

2842-KOLNP-2007-GRANTED-ABSTRACT.pdf

2842-KOLNP-2007-GRANTED-CLAIMS.pdf

2842-KOLNP-2007-GRANTED-DESCRIPTION (COMPLETE).pdf

2842-KOLNP-2007-GRANTED-DRAWINGS.pdf

2842-KOLNP-2007-GRANTED-FORM 1.pdf

2842-KOLNP-2007-GRANTED-FORM 2.pdf

2842-KOLNP-2007-GRANTED-LETTER PATENT.pdf

2842-KOLNP-2007-GRANTED-SPECIFICATION.pdf

2842-KOLNP-2007-OTHERS.1.3.pdf

2842-KOLNP-2007-PA.pdf

2842-KOLNP-2007-PETETION UNDER RULE 137.pdf

2842-KOLNP-2007-REPLY TO EXAMINATION REPORT.1.3.pdf

2842-KOLNP-2007-REPLY TO EXAMINATION REPORT.pdf

2842-KOLNP-2007-TRANSLATED COPY OF PRIORITY DOCUMENT.1.3.pdf

abstract-02842-kolnp-2007.jpg


Patent Number 247697
Indian Patent Application Number 2842/KOLNP/2007
PG Journal Number 18/2011
Publication Date 06-May-2011
Grant Date 02-May-2011
Date of Filing 03-Aug-2007
Name of Patentee EMCON TECHNOLOGIES GERMANY (AUGSBURG) GMBH
Applicant Address BIBERBACHSTRASSE 9, 86154 AUGSBURG
Inventors:
# Inventor's Name Inventor's Address
1 FORSTER, ERICH AN DER ALTEN SAGE 1, 86845 GROSSAITINGEN
2 SCHMIDT, STEFAN PAUL-KLEE-STRASSE 8D, 86462 LANGWEID
3 KRONER, PETER BRUNNENBACHSTRASSE 22A, 86157 AUGSBURG
PCT International Classification Number F01N 3/28, F01N 7/18
PCT International Application Number PCT/EP2006/000371
PCT International Filing date 2006-01-17
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 10 2005 002 165.4 2005-01-17 Germany