U.S. patent application number 16/257705 was filed with the patent office on 2019-06-06 for muffler for single-cylinder diesel engine.
The applicant listed for this patent is Motorenfabrik Hatz GmbH & Co. KG. Invention is credited to Wolfgang DORNER, Tobias WINTER.
Application Number | 20190170043 16/257705 |
Document ID | / |
Family ID | 59409320 |
Filed Date | 2019-06-06 |
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United States Patent
Application |
20190170043 |
Kind Code |
A1 |
WINTER; Tobias ; et
al. |
June 6, 2019 |
MUFFLER FOR SINGLE-CYLINDER DIESEL ENGINE
Abstract
A muffler for single-cylinder diesel engines with an integrated
oxidation catalyst is provided, such that the muffler is connected
to the cylinder head of the engine, that the muffler housing is
divided into two chambers, that is, an inlet chamber and an outlet
chamber, by means of an intermediate wall and that the oxidation
catalyst is secured in the intermediate wall such that it
fludically connects together both chambers.
Inventors: |
WINTER; Tobias;
(Furstenzell, DE) ; DORNER; Wolfgang; (Brombach,
DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Motorenfabrik Hatz GmbH & Co. KG |
Ruhstorf/Rott |
|
DE |
|
|
Family ID: |
59409320 |
Appl. No.: |
16/257705 |
Filed: |
January 25, 2019 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
PCT/EP2017/068077 |
Jul 18, 2017 |
|
|
|
16257705 |
|
|
|
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F01N 2230/04 20130101;
F01N 2490/04 20130101; F01N 1/089 20130101; F01N 13/1855 20130101;
F01N 1/026 20130101; F01N 1/085 20130101; F01N 2450/22 20130101;
F01N 3/103 20130101; F01N 1/006 20130101; F01N 13/1805 20130101;
F01N 2590/06 20130101; F01N 1/165 20130101; F01N 3/2885 20130101;
F01N 2260/20 20130101; F01N 2490/06 20130101; F01N 2490/16
20130101; F01N 13/143 20130101; F01N 13/1872 20130101; F01N
2490/155 20130101; F01N 2450/24 20130101; F01N 13/1888
20130101 |
International
Class: |
F01N 3/28 20060101
F01N003/28; F01N 1/16 20060101 F01N001/16; F01N 1/08 20060101
F01N001/08; F01N 13/18 20060101 F01N013/18; F01N 1/00 20060101
F01N001/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 26, 2016 |
DE |
10 2016 113 756.1 |
Claims
1. A muffler for a single-cylinder diesel engine having an
oxidation catalyst in the muffler housing, which is attached to the
cylinder head of the engine, wherein the muffler housing is divided
by an intermediate wall (3) into two chambers and the oxidation
catalyst (28) is fastened in the intermediate wall (3) in such a
way that it places two chambers fluidically in communication with
one another, and wherein an outlet chamber (5) of the muffler,
connected downstream from the intermediate wall (3) in flow
direction, is joined in gas-tight manner to an outlet pipe (10) for
the post-treated exhaust gas, wherein: the muffler housing is
attached by means of a flanged joint directly to the cylinder head
and the intermediate wall (3) has openings for gas-tight
installation of mounting pipes (14), which traverse the muffler
housing and at their engine-side ends are fastened to the inside of
a muffler-side attachment flange (9) in association with its joint
bores (15), for the purpose of applying a screw coupling of the
attachment flange (9) to a corresponding flange part of the
cylinder head.
2. The muffler of claim 1, wherein the muffler-side attachment
flange (9) is welded at its lateral periphery in a gas-tight manner
to an embossment (22) of the muffler housing encircling it.
3. The muffler of claim 1, wherein the intermediate wall (3) is
fastened in a gas-tight manner between two housing parts of the
muffler housing.
4. The muffler of claim 1, wherein the intermediate wall (3) has an
opening for the penetration, in a gas-tight manner, of the catalyst
body (28).
5. The muffler of claim 1, wherein the intermediate wall (3) has an
opening for receiving the closed inner end of the exhaust pipe (10)
in a gas-tight manner.
6. The muffler of claim 5, wherein the inner end of the outlet pipe
(10) projects into an inlet chamber (4) of the muffler housing
connected upstream from the intermediate wall (3) and is braced
displaceably there in an associated indentation of the housing rear
wall (1) of the muffler housing.
7. The muffler of claim 1, wherein the outlet pipe (10) is designed
to be perforated in its portion inside the outlet chamber (5) of
the muffler housing.
8. The muffler of claim 1, wherein the intermediate wall (3) is
designed to be dish-shaped with convex bulge toward the exhaust gas
flowing into the inlet chamber (4) of the muffler.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation under 35 U.S.C. .sctn.
120 of International Application PCT/EP2017/068077, filed Jul. 18,
2017, which claims priority to German Application No. 10 2016 113
756.1, filed Jul. 26, 2016, the contents of each of which are
incorporated by reference herein.
FIELD OF THE INVENTION
[0002] The invention relates to a muffler for a single-cylinder
diesel engine having an oxidation catalyst.
BACKGROUND
[0003] Such drives are known. Reference is made to DE 101 39 700 A1
and JP 2015-143 510 A. They are preferably used to operate
construction machinery or as low-power stationary drives.
[0004] In this connection, the requirements applicable to the
cleaning/detoxification of the exhaust gas are different.
Frequently, the treatment of the exhaust gas by means of an
oxidation catalyst is sufficient, i.e. the oxidation of the CO
components in the exhaust gas to CO.sub.2 as well as of
hydrocarbons to CO.sub.2 and water.
[0005] In the case of retrofitting of an oxidation catalyst in an
existing single-cylinder diesel engine, allowance is to be made
from the viewpoint of structural mechanics that an oxidation
catalyst is to be associated with the existing muffler without
altering the natural frequency of the overall unit in the process,
in order to avoid unfavorable vibrational loads. In this way, it is
possible to prevent damage to the working machine connected to the
drive unit.
[0006] The present invention therefore has as an underlying object
of combining an oxidation catalyst appropriately with a muffler
while avoiding the said disadvantages, especially of lowering the
natural frequency and the resonance-induced damage associated
therewith.
SUMMARY
[0007] To achieve this object, it is provided according to the
invention that the muffler housing is attached by means of a
flanged joint directly to the cylinder head and that the
intermediate wall (3) has openings for gas-tight installation of
mounting pipes (14), which traverse the muffler housing and at
their engine-side ends are fastened to the inside of a muffler-side
attachment flange (9) in association with its joint bores (15), for
the purpose of applying a screw coupling of the attachment flange
(9) to a corresponding flange part of the cylinder head.
[0008] In this way, the extra weight introduced by the oxidation
catalyst into the muffler can be absorbed by the intermediate wall
and distributed over the entire muffler housing. Thus the said
natural frequency of the muffler can be kept within a noncritical
range, so that resonance-induced damage to the muffler housing or
the overall apparatus can be avoided, for example by vibratory
plates used in the construction industry.
[0009] During the use of diesel oxidation catalysts, carbon
monoxide (CO) is oxidized to carbon dioxide (CO.sub.2) and
hydrocarbons (C.sub.nH.sub.m) in the exhaust gas to carbon dioxide
(CO.sub.2) and water. Within the scope of the present invention,
the high exhaust-gas temperatures that are advantageous for
oxidation are maintained by the fact that the muffler has a flanged
joint by means of which it can be attached directly to the cylinder
head.
[0010] In this connection, a particularly advantageous
configuration consists in the fact that the intermediate wall has
openings for the gas-tight penetration of mounting pipes, which
traverse the muffler housing and at their engine-side ends are
fastened to a muffler-side attachment flange in association with
its joint bores.
[0011] According to an embodiment of the invention, a robust
embodiment that is stable to vibrations consists in the fact that
the muffler-side attachment flange is welded at its lateral
periphery in gas-tight manner to an embossment of the muffler
housing encircling it.
[0012] According to an embodiment of the invention, the
intermediate wall itself is fastened in gas-tight manner between
two separate housing parts of the muffler housing, namely a housing
rear wall turned toward the engine and a housing cover. Both
housing parts are welded along their periphery to the intermediate
wall.
[0013] The intermediate wall is advantageously designed to be
dish-shaped with convex bulge toward the exhaust gas flowing into
the inlet chamber of the muffler. Thereby the intermediate wall is
stiffened and thus an improved stiffness of the entire muffler
housing is achieved.
[0014] The catalyst body itself punches through the intermediate
wall in which it is received in gas-tight manner in an opening. The
untreated exhaust gas therefore flows out of the inlet chamber
formed by the housing rear wall through the catalyst body into the
outlet chamber separated by the housing cover and from there as
post-treated exhaust gas into the outlet pipe of the engine.
[0015] A particularly stable seat of the closed inner end of the
outlet pipe is achieved according to an embodiment of the invention
by the fact that the intermediate wall has an opening for receiving
the inner end of the outlet pipe in gas-tight manner.
[0016] For this purpose, it is provided in a further advantageous
configuration of the holder of the outlet pipe in the interior of
the muffler housing that its inner end projects into the inlet
chamber of the muffler housing and is braced displaceably there in
an associated indentation of the housing rear wall of the muffler
housing.
[0017] With the objective of suppressing vibrations of the muffler
housing as well as possible, the housing itself is equipped with
beads provided on all sides and similar embossed shapes of the
housing parts, which not only impart stiffness but also favor the
prevention of resonance vibrations. This objective is also served
by the structure--which according to an embodiment of the invention
is perforated--of the exhaust pipe in its portion inside the outlet
chamber of the muffler housing.
BRIEF DESCRIPTION OF THE DRAWING
[0018] An embodiment of the invention will be described hereinafter
on the basis of the drawing, wherein
[0019] FIG. 1 shows a sectional diagram of the muffler according to
I-I of FIG. 2,
[0020] FIG. 2 shows a view toward the housing rear wall of the
muffler with attachment flange,
[0021] FIG. 3 shows a perspective view of the housing cover with
outgoing exhaust-gas pipe,
[0022] FIG. 4 shows a sectional diagram of the muffler according to
IV-IV of FIG. 3,
[0023] FIG. 5 shows a variant of the sectional diagram according to
FIG. 4, and
[0024] FIG. 6 shows a perspective view of the housing rear wall of
the variant according to FIG. 5.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0025] The figures of the drawings show the muffler housing with
housing rear wall 1 and housing cover 2, between which an
intermediate wall 3 is fastened. Intermediate wall 3 extends in
gas-tight manner transversely through the entire muffler housing;
it is designed in dish-shaped manner and possesses a convex bulge
in an inlet chamber 4 formed by housing rear wall 1; with its
convex side, it therefore bounds an outlet chamber 5 formed by
housing cover 2. Intermediate wall 3 possesses an encircling bulged
connecting rim 6, into which the open end 7, facing it, of housing
cover 2 penetrates, so that a gas-tight joint between the two
housing parts, namely the housing rear wall 1 and the housing cover
2, is assured, for example by welding.
[0026] Catalyst body 28 of an oxidation catalyst extends from inlet
chamber 4 through intermediate wall 3, to which it is joined in
gas-tight manner, into outlet chamber 5. The exhaust gas from the
cylinder head flows via a flanged joint through an attachment
flange 9 fastened to housing rear wall 1 in the direction of arrow
P1 in the interior of inlet chamber 4 and from there flows through
catalyst body 28 according to arrow P2. The exhaust gas treated in
catalyst body 28 passes from catalyst body 28 into outlet chamber 5
and from there into an outlet pipe 10, 10' for the treated exhaust
gas (see FIG. 4-6). After exiting catalyst body 28, the treated
exhaust gas flows through perforations 11 into the interior of
exhaust pipe 10, 10' and further, according to arrow P3, P3',
through an exhaust-gas line (not illustrated) into the
environment.
[0027] Concerning the geometry of the muffler housing, its housing
rear wall 1 and its housing cover 2, is stiffened multiple times as
indicated with contour lines, for example by beads 12 in the region
of housing rear wall 1 (FIG. 4) or by indentations/embossments 13,
22 of the housing dishes, preferably in regions of connection to
other components. Due to such stamped shapes, the housing parts of
the muffler housing acquire greater stiffness, whereby the tendency
toward housing vibrations is reduced.
[0028] It is self-evident that built-in parts of the muffler
housing that punch through the housing wall and the intermediate
wall in the regions of the respective openings are joined in
gas-tight manner to the intermediate wall or to the housing walls,
for which purpose welded joints are normally provided. This is the
case for the passage of catalyst body 28 through intermediate wall
3, for the passage of outlet pipe 10 through housing cover 2 as
well as for outlet pipe 10' through housing rear wall 1 (FIG. 5)
and also for the passage of the three mounting pipes 14 shown in
the exemplary embodiment through housing rear wall 1, intermediate
wall 3 and housing cover 2. The three mounting pipes 14 are joined
firmly at their engine-side ends to attachment flange 9, so that
attachment bores 15 (FIG. 2) of attachment flange 9 can be reached
by the mounting tool, which is inserted on the side of housing
cover 2, through mounting pipes 14. The fastening of attachment
flange 9 to a corresponding flange part (not illustrated) of the
cylinder head takes place by applying a screw coupling for
establishment of a strong and tight flanged joint between the
muffler housing on the one hand and the cylinder block on the
other. A flanged seal (not illustrated) ensures that the untreated
exhaust gas passes from the combustion chamber of the engine
directly and along the shortest path through flange bore 16 into
inlet chamber 4 inside housing rear wall 1. Fastening points 17 on
the outside of housing cover 2 and on the outside of housing rear
wall 1 are used to fasten a heat shield 18, which is shown
schematically as a broken line in FIGS. 1 and 2. It functions as
protection against burns due to contact and extends along the
outside of housing cover 2 and, with an angled part, over a narrow
side of the muffler housing.
[0029] In FIG. 4, the closed inside end of outlet pipe 10 is
illustrated. A cover 19 closes the inside end of outlet pipe 10.
The end of outlet pipe 10 is braced relative to the adjacent
housing rear wall 1 in longitudinally displaceable manner in a
guide (not illustrated).
[0030] The sectional diagrams according to FIGS. 4 and 5 show
similar cross sections in plane IV-IV of FIG. 3 through the muffler
housing.
[0031] In FIG. 4, outlet pipe 10 passes through housing cover 2
toward the outside with outflow of the cleaned exhaust gas
according to arrow P3.
[0032] FIG. 5 shows an alternative approach to this. Here, outlet
pipe 10' passes through housing rear wall 1 toward the outside with
outflow of the cleaned exhaust gas according to arrow P3'. Through
a perforated pipe length 21 in the interior of outlet chamber 5,
the cleaned exhaust gas passes according to arrow P2' via outlet
pipe 10', which traverses inlet chamber 4 in gas-tight manner, then
according to arrow P3' to the outside.
[0033] FIG. 6 shows a perspective view of the muffler housing
toward its housing cover 2. According to the variant shown in FIG.
5, outlet pipe 10' discharges outward through housing rear wall 1.
In other respects, the muffler housing corresponds to the view
shown in FIG. 3, as described there.
* * * * *