U.S. patent application number 14/151945 was filed with the patent office on 2014-07-17 for silencer and method for manufacturing the same.
This patent application is currently assigned to HENN GMBH & CO KG.. The applicant listed for this patent is HENN GMBH & CO KG.. Invention is credited to Harald HARTMANN.
Application Number | 20140196977 14/151945 |
Document ID | / |
Family ID | 49998075 |
Filed Date | 2014-07-17 |
United States Patent
Application |
20140196977 |
Kind Code |
A1 |
HARTMANN; Harald |
July 17, 2014 |
SILENCER AND METHOD FOR MANUFACTURING THE SAME
Abstract
The invention relates to a silencer (1), in particular a vehicle
silencer, having a continuous pipe (2) as well as a first resonator
chamber (14) and a second resonator chamber (15) each surrounding
the pipe (2) and being arranged one behind the other, with the
shell (3) of the pipe (2) having at least one first opening (7)
which opens into the first resonator chamber (14), and at least one
second opening, which opens into the second resonator chamber (15).
In order to allow a more flexible manufacturability, the resonator
chambers (14, 15) are formed from a first housing part (4) and a
second housing part (5), each having a shell embodied around an
axis, and the length of the shell of the one housing part (4; 5),
as seen in axial direction, is at least the half of the length of
the other housing part (5; 4), and the housing parts (4, 5) are
slid inside each other and overlap their shells at least in parts,
and in the overlapping region (6), the shell exterior face (4a) of
the first housing part (4) rests against the shell interior face
(5b) of the second housing part (5), and in at least the
overlapping region (6), the shell exterior face (4a) of the first
housing part (4) and the shell interior face (5b) of the second
housing part (5) each have a constant cross-section as seen in
axial direction, and the housing parts (4, 5) have a recess on each
side facing away from the overlapping region (6), which recess the
pipe (2) passes through.
Inventors: |
HARTMANN; Harald; (Dornbirn,
AT) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
HENN GMBH & CO KG. |
Dornbirn |
|
AT |
|
|
Assignee: |
HENN GMBH & CO KG.
Dornbirn
AT
|
Family ID: |
49998075 |
Appl. No.: |
14/151945 |
Filed: |
January 10, 2014 |
Current U.S.
Class: |
181/227 ;
29/890.08 |
Current CPC
Class: |
Y10T 29/49398 20150115;
F01N 1/026 20130101; F02B 33/44 20130101; F02M 35/1283 20130101;
F02M 35/1266 20130101 |
Class at
Publication: |
181/227 ;
29/890.08 |
International
Class: |
F01N 1/10 20060101
F01N001/10 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 16, 2013 |
AT |
A 50024/2013 |
Claims
1. Silencer (1), in particular a vehicle silencer, having a pipe
(2) forming a flow duct and having a first resonator chamber (14)
and a second resonator chamber (15), each surrounding the pipe (2)
and being arranged one behind the other in axial direction, with
the pipe (2) having in its shell (3) at least one first opening (7)
which opens into the first resonator chamber (14), and at least one
second opening (8) which opens into the second resonator chamber
(15), wherein the resonator chambers (14, 15) are formed from a
first housing part (4) and a second housing part (5) which each
have a shell embodied around an axis, with--as seen in axial
direction--the length of the shell of the one housing part (4; 5)
being at least the half of the length of the shell of the other
housing part (5; 4), and wherein the housing parts (4, 5) are slid
inside each other and their shells overlap at least in parts, and
in the overlapping region, the shell exterior face (4a) of the
first housing part (4) rests against the shell interior face (5b)
of the second housing part (5), and the shell exterior face (4a) of
the first housing part (4) and the shell interior face (5b) of the
second housing part (5) each have a constant cross-section as seen
in axial direction, at least in the overlapping region (6), and
wherein the housing parts (4, 5) each have a recess (21, 22) where
the flow duct extends through.
2. Silencer according to claim 1, wherein the majorities of the
sections of the shell exterior face (4a) of the first housing part
(4) and the shell interior face (5b) of the second housing part (5)
each have a constant cross-section as seen in axial direction.
3. Silencer according to claim 1, wherein the housing parts (4, 5)
are each designed to be cylindrical, and the shell exterior face
(4a) of the first housing part (4) and the shell interior face (5b)
of the second housing part (5) each have a circular
cross-section.
4. Silencer according to claim 1, wherein as seen in axial
direction, the length of the shell of the one housing part (4; 5)
is at least two thirds, preferably three quarters, of the length of
the shell of the other housing part (5; 4), and it is particularly
preferred that the shells of the housing parts (4, 5) are
essentially of the same length.
5. Silencer according to claim 1, wherein at least in the
overlapping region (6), preferably continuously, the shells of the
housing parts (4, 5) have a constant shell thickness as seen in
axial direction in each case.
6. Silencer according to claim 1, wherein the housing parts (4, 5)
have an end face (9, 10) on each side facing away from the
overlapping region (6), in which end faces the recesses (21, 22)
for the passage of the pipe (2) are formed.
7. Silencer according to claim 1, wherein the housing parts (4, 5)
are in each of their regions of their recesses (21, 22) connected
to the pipe (2) in a manner airtight to the outside.
8. Silencer according to claim 1, wherein the housing parts (4, 5)
are welded to each other in their overlapping region (6).
9. Silencer according to claim 1, wherein the shell of the one
housing part (4) and the shell of the other housing part (5) each
form a part of the external wall of the silencer (1).
10. Silencer according to claim 1, wherein the housing parts (4, 5)
seal the resonator chambers (14, 15) in a manner airtight to the
outside.
11. Silencer according to claim 1, wherein the shell lying outside
in the overlapping region (6) has a beading (13) at its edge.
12. Silencer according to claim 1, wherein in one of the housing
parts (5), a separating wall (20) is situated which separates the
resonator chambers (14, 15) from each other, and the separating
wall (20) has a recess for the passage of the pipe (2).
13. Silencer according to claim 1, wherein the housing parts (4, 5)
are clamped between two profiles (16, 17) which are each situated
at a pipe section (11, 12) extending outside the resonator chambers
(14, 15).
14. Silencer according to claim 1, wherein the housing parts (4, 5)
are made of sheet metal, preferably of stainless steel sheet.
15. Silencer according to claim 1, wherein the region of the pipe
(2) surrounded by the resonator chambers (14, 15) is formed from a
first part of pipe (2a) and a second part of pipe (2b) which are
slid inside each other in their end regions, with the first housing
part (4) surrounding the first part of pipe (2a), and the second
housing part (5) surrounding the second part of pipe (2b).
16. Silencer according to claim 15, wherein at least one of the
parts of pipe (2b) is formed to be integral with the housing part
(5) surrounding it, and is preferably made of a deep-drawn piece of
sheet metal.
17. Silencer according to claim 16, wherein the integrally formed
part forms a projection (23) which rests against a pipe section
(12) at least partially extending outside the resonator chambers
(14, 15), and is held from outside by a profile (17), preferably a
spring clip, so that the projection (23) is in radial direction
arranged between the pipe section (12) and the profile (17).
18. Silencer according to claim 15, wherein the separating wall
(20) is integrally formed with one of the parts of pipe (2a, 2b),
preferably with the part of pipe (2a) slid on the other part of
pipe (2b), and is preferably made of a deep-drawn piece of sheet
metal.
19. Silencer according to claim 1, wherein at least one
circumferentially extending sealing ring (24) is inserted in the
overlapping section (6) between the shell exterior face (4a) of the
first housing part (4) and the shell interior face (4b) of the
second housing part (5).
20. Silencer according to claim 19, wherein in the shell of the
first housing part (4) and/or in the shell of the second housing
part (5), an annularly extending holding (25) for the sealing ring
(24) is embodied, with the holding (25) being preferably formed
from a bow-shaped course of the shell.
21. Vehicle (19), in particular a road vehicle, having a silencer
(1), in particular a turbocharger silencer, which is arranged on
the discharge side of a turbocharger (18), wherein the silencer (1)
is a silencer according to claim 1.
22. Method for manufacturing a silencer according to claim 1,
having a pipe (2) forming a flow duct as well as a first resonator
chamber (14) and a second resonator chamber (15) each surrounding
the pipe (2) and being arranged one behind the other, with the pipe
(2) in its shell (3) having at least one first opening (7) which
opens into the first resonator chamber (14), and at least one
second opening (8), which opens into the second resonator chamber
(15), wherein for forming the resonator chambers (14, 15), a first
housing part (4) and a second housing part (5) are provided each
having a recess (21, 22) for the flow duct, and a shell embodied
around an axis, and which can be telescopically slid inside each
other along the axis, with the length of the shell of the one
housing part (4; 5), as seen in axial direction, being at least the
half of the length of the shell of the other housing part (5; 4),
and with the shell exterior face (4a) of the first housing part (4)
resting against the shell interior face (5b) of the second housing
part (5) in different telescopic positions, and wherein for forming
the resonator chambers (14, 15) and for adjusting a defined
resonator volume of a resonator chamber (15), the prefabricated
housing parts (4, 5) are telescopically slid inside each other to a
corresponding extent.
23. Method according to claim 22, wherein the housing parts (4, 5)
are slid on the pipe (2), so that the pipe (2) passes through the
recesses (21, 22) of the housing parts (4, 5).
24. Method according to claim 22, wherein the housing parts (4, 5)
are welded to each other in their overlapping region (6) after the
resonator volume of a resonator chamber (14) has been adjusted by
sliding the housing parts (4, 5) into each other.
25. Method according to claim 22, wherein the prefabricated housing
parts (4, 5) have an end face (9, 10) on each side facing away from
the overlapping region (6), in which end face (9, 10) a recess (21,
22) corresponding to the external diameter of the pipe (2) is
embodied, and wherein the housing parts (4, 5) are slid on the pipe
(2) so that the at least one first opening (7) opens into the first
resonator chamber (14) and the at least one second opening (8)
opens into the second resonator chamber (15).
26. Method according to claim 22, wherein the housing parts (4, 5)
are prefabricated as pot-shaped parts the bottoms of which have the
recess (21, 22) for the passage of the flow duct.
27. Method according to claim 22, wherein one of the housing parts
(5) is provided with a separating wall (20) which, in assembled
state, separates the first resonator chamber (14) from the second
resonator chamber (15).
28. Method according to claim 22, wherein in the region surrounded
by the resonator chambers (14, 15), the pipe (2) is formed from a
first part of pipe (2a) and a second part of pipe (2b) which are
slid inside each other in their end regions, with the first housing
part (4) surrounding the first part of pipe (2a) and the second
housing part (5) surrounding the second part of pipe (2b).
29. Method according to claim 28, wherein at least one of the parts
of pipe (2b) is formed to be integral with the housing part (5)
surrounding it, preferably by deep-drawing a piece of sheet
metal.
30. Method according to claim 22, wherein in the overlapping region
(6) at least one circumferentially extending sealing ring (24) is
inserted between the shell exterior face (4a) of the first housing
part (4) and the shell interior face (5b) of the second housing
part (5).
Description
[0001] The invention relates to a silencer, in particular a vehicle
silencer, having a pipe forming a flow duct as well as a first
resonator chamber and a second resonator chamber, each surrounding
the pipe and being arranged one behind the other in axial
direction, with the pipe in its shell having at least one first
opening which opens into the first resonator chamber, and at least
one second opening which opens into the second resonator chamber.
The invention also relates to a vehicle having a silencer, and to a
method for manufacturing a silencer.
[0002] A silencer of that kind is disclosed in document EP 1400662
B1. This publication discloses two resonator chambers that are
arranged one behind the other in axial direction and separated from
the flow duct by a perforated plate. The manufacture of the
silencer designed according to the principle of a Helmholtz
resonator is expensive and elaborate. In order to produce silencers
having different resonator volumes it is in each case also required
to produce different parts and provide them in accordance with the
case of application. Thus, the manufacturing process flexibility is
not very flexible.
[0003] WO 07101412 A1 discloses a silencer of modular type of
construction and method of producing it. For this purpose, a number
of fluid guide elements forming a labyrinth of channels and
resonator chambers is provided. A continuous pipe is not provided,
design and construction are very complex and require a number of
component parts, the composition of which is very elaborate.
[0004] Document DE 736633 A discloses a silencer comprising one or
several chambers, where the gases flow along inside the shell of
the silencer. This being the case, two chambers are in each case
connected to one another by an annular space.
[0005] The internal pipe is not embodied to be continuous but opens
with a first pipe connecting piece, coming from one side, into a
central chamber. From there, the fluid flows into an annular space
via radial openings, is redirected there and lead into a further
chamber. The second pipe connecting piece of the silencer projects
into this further chamber. This construction is very much different
from the above-mentioned silencer and its assembly requires
comparably many individual components that not only have to be
positioned exactly but also need to be supported in order to
achieve sufficient stability.
[0006] DE 10 2008 015353 A1 discloses a charging device, in
particular an exhaust turbocharger for a vehicle having a silencer
based on the principle of a resonant absorber for reducing the
sound generated by the charging device. This being the case, a
shell and an insert element together form the silencer. The
silencer is thus an integral part of the charging device. The
insert element formed from plastic material can be screwed to the
shell of the charging device. A continuous exhaust pipe is not
provided. This solution is only suitable for certain applications
and needs to be adapted exactly to the design of the charging
device.
[0007] WO 1205248 A2 discloses a wide-band damper for charge air
lines of an internal combustion engine with turbocharger. This
solution does not include a continuous pipe but discloses pipe
sections arranged one behind the other, and each of them being
separated from another by an annular gap, with the gap connecting
the interior of the fluid line with the resonator chamber arranged
outside. This is a very special solution and difficult to produce
due to its design and requires a high number of components.
Furthermore, the mechanical stability is low.
[0008] DE 10 2010 020064 A1 discloses a silencer arrangement for a
particularly charged vehicle internal combustion engine. This
comprises a shell wherein a flow duct is designed, with a resonator
chamber being arranged outside the flow duct. The silencer
arrangement simultaneously forms a coupling between a hose section
and an exhaust turbocharger. This being the case, two shell parts
are inserted into one another, and the faces touching each other
are embodied to have a conical shape and rest against one another
in the predefined position. Design and manufacture of such a
construction is complex and limited to a predefined resonator
volume. If other resonance conditions are required to be created
for certain applications, it results to be necessary to provide the
component parts with essentially different dimensions. This
requires additional effort already when the individual parts are
being prefabricated.
[0009] Finally, also JP 2008082306 A, DE 19957597 B4, DE 4219249 A1
and DE 3020492 C2 disclose silencer constructions which, however,
are different from the present invention.
[0010] An essential disadvantage of the known silencers or the
production methods is that for manufacturing silencers having
different resonator volumes, the required components are to be
adapted to the respective resonator volume. This means that
individually dimensioned components have to be used depending on
the desired resonator volume. This requires an increased effort
already when the components are being prefabricated. Also during
assembly, these components are to be considered individually. These
requirements also have a negative influence on the costs of the
silencer.
[0011] The objective of the present invention is to provide a
silencer and a manufacturing method not having these disadvantages
and where the manufacture of different silencers having different
resonator volumes does not require additional effort when it comes
to the prefabrication of the components and their assembly. This
invention will allow reliable, mechanically stable and efficiently
damping silencers to be manufactured.
[0012] By means of an above-mentioned silencer this objective is
achieved by the fact that the resonator chambers are formed by a
first and a second housing part, each housing part having a shell
designed around an axis, and the length of the shell of the one
housing part is in axial direction at least the half of the length
of the shell of the other housing part, and that the housing parts
are slid inside each other and their shells overlap each other at
least in parts, with the shell exterior face of the first housing
part resting again the shell interior face of the second housing
part in the overlapping region, and the shell exterior face of the
first housing part and the shell interior face of the second
housing part each have a constant cross-section in axial direction,
and that the housing parts each have a recess, where the flow duct
extends through.
[0013] The advantage of such a construction resides in the fact
that the housing parts can be slid into each other to different
extents other during manufacture, depending on the desired
resonator volume. The housing parts are--before being fixed to one
another, e.g. welded--telescopic, and the shell faces rest again
one another in the different telescopic positions in the
overlapping region.
[0014] The feature, according to which the shell exterior face of
the first housing part and the shell interior face of the second
housing part each have a constant cross-section or cross-sectional
contour in axial direction, at least in the overlapping region,
allows a telescopic ability with shell faces continuously resting
against each other during assembly. The cross-section concerned
extends in this case perpendicularly with respect to the axial
direction.
[0015] Only when the correct relative position of the housing parts
has been achieved by telescoping, the housing parts will be fixed.
Thus, a high degree of flexibility is achieved, without the
requirement that differently dimensioned housing parts have to be
produced for different resonator volumes.
[0016] Usually, the recesses (provided for the pipe or the flow
duct) are arranged on the side of the respective housing part
facing away from the overlapping region.
[0017] It is preferred that the pipe is embodied to be continuous
at least in the region surrounded by the resonator chambers, and
passes through the recesses of the housing parts. As a result, a
particularly simple manufacture including only a few parts is
allowed.
[0018] It is alternatively possible that the pipe running inside is
made of two parts that are slid inside each other, thus forming a
continuous flow duct.
[0019] It is preferred that the shell exterior face of the first
housing part and the shell interior face of the second housing part
each have a constant cross-section as seen in axial direction in
the majority of their regions. Apart from the simple construction
this allows a maximum of telescopic ability during manufacture and
thus a large extent of variability of the resonator volume.
[0020] It is preferred that the housing parts are each embodied to
be cylindrical and the shell exterior face of the first housing
part and the shell interior face of the second housing part each
have a circular cross-section. This allows a simple telescoping
during manufacture, and twisting the housing parts slightly against
each other can help to overcome possible resistances.
[0021] It is preferred that the shells of the housing parts each
have, as seen in axial direction, a constant shell thickness at
least in the overlapping region, preferably continuously. It is
thus possible for the shells or also all housing parts to be
produced of sheets of metal having a constant thickness, which
results in an advantageous reduction of weight.
[0022] It is preferred that the length of the shell of one housing
part is in axial direction at least two thirds, preferably three
quarters, of the length of the shell of the other housing part,
with preferably the shells of the housing parts being essentially
of the same length. Thus, the maximum possible extent to which the
housing parts can be slid inside each other during manufacture
becomes large, with the result that a maximum of flexibility during
the manufacturing process in terms of the resonator volume is
ensured.
[0023] It is preferred that the housing parts have an end face on
each side facing away from the overlapping region, in which end
faces the recesses for the passage of the pipe or the flow duct ass
are embodied. The end faces limit the resonator chambers in axial
direction and their recesses form a connection to the pipe.
[0024] It is preferred that the housing parts are in each region of
their recesses connected with the pipe to seal towards the outside
in an airtight manner. No additional cover or shell creating
airtightness is thus required. The housing parts directly limit the
resonator chambers towards the outside.
[0025] It is preferred that the housing parts are welded to each
other in their overlapping region. This is a measure that is easily
to realize and ensures not only mechanical stability but also an
airtight closure. It is alternatively possible to create a
force-locked connection, e.g. by means of clips.
[0026] It is preferred that the shell of the one housing part and
the shell of the other housing part each form a part of the
external wall of the silencer. This is a space- and material-saving
solution, since no further outer shell is required.
[0027] It is preferred that the housing parts seal the resonator
chambers towards the outside in an airtight manner. This feature as
well aims at reliability, simplicity and savings in terms of
space.
[0028] It is preferred that the shell (of the second housing part)
lying within the overlapping region has a beading at its edge. The
beading or the eversion simplifies the insertion of the first
housing part into the second housing part. In addition, the beading
at the housing part provides protection against injuries. Due to
this fact, it is possible to use also very thin sheets of metal.
The stability is increased by this measure as well.
[0029] It is preferred that a separating wall separating the
resonator chambers from each other, is arranged in one of the
housing parts, with the separating wall having a recess for the
passage of the pipe or the flow duct. The separating wall is in
this case fixed to the housing part and can already be present at
the prefabricated housing part, so that no additional measures for
separating the resonator chambers are being required during
assembly.
[0030] It is preferred that the housing parts are clamped between
two profiles, which profiles are each situated at a pipe section
extending outside the resonator chambers. These pipe sections can
each be designed as an (integral) part of the pipe extending inside
the resonator chambers, or each fixed to the interior pipe as a
separated pipe section. This does not only allow a fixation at the
pipe but also a correct positioning which guarantees that the first
openings open into the first resonator chamber and the second
openings open into the second resonator chamber. It is additionally
possible to use the profiles as connection profiles for a hose or a
connecting pipe.
[0031] It is preferred that the housing parts are made of metal
sheets, preferably stainless steel sheets. The housing part is
preferably formed as a deep-drawn pot. Such a measure allows saving
weight when thin wall thicknesses are used and do not have a
negative influence on stability.
[0032] It is preferred that region of the pipe which is surrounded
by the resonator chambers is formed from a first part of the pipe
and a second part of the pipe, the end regions of which parts are
inserted into each other, with the first housing part surrounding
the first pipe section and the second housing part surrounding the
second pipe section. It is thus possible to co-form also the pipe
extending inside when the housing parts are being assembled, with
the result that the production process is getting even easier.
[0033] It is preferred that at least one of the parts of the pipe
is formed to be integral with the housing part surrounding it,
preferably from a deep-drawn piece of sheet metal. This measure
reduces the required components and provides a high mechanical
stability. By way of a deep-drawing process, the integral part is
provided with two functionalities, namely the housing functionality
and the design of the flow duct.
[0034] It is preferred that the integral part forms a projection,
which rests against a pipe section at least parts of which extend
outside the resonator chambers, and is held from outside by a
profile, preferably a spring clip, with the result that the
projection is in radial direction arranged between the pipe section
and the profile. This simplifies the assembly and the fixation of
the individual components.
[0035] It is preferred that the separating wall is formed to be
integral with one of the parts of the pipe, preferably with the
part of the pipe slid on the other part of the pipe, preferably
formed from a deep-drawn metal sheet, with the result that it is
possible to continue simplifying the silencer and its
manufacture.
[0036] It is preferred that at least one circumferentially
extending sealing ring is inserted in the overlapping region
between the shell exterior face of the first housing part and the
shell interior face of the second housing part. If these two
housing parts are not welded, a force-locked connection can
reliably be sealed by means of an O-ring.
[0037] It is preferred that in the shell of the first housing part
and/or in the shell of the second housing part, an annularly
extending holding for the sealing ring is embodied, with preferably
the holding being formed from a bow-shaped course of the shell.
Thus, the sealing ring remains fixed during the telescoping
(adjusting the resonator volume).
[0038] The objective is also achieved by a vehicle, in particular a
road vehicle, having a silencer, in particular a turbocharger
silencer, which is arranged on the discharge side of a
turbocharger, with the silencer being embodied according to one of
the preceding explanations. It is preferred that the silencer is a
turbocharger silencer which is arranged on the discharge side of a
turbocharger. The turbocharger silencer serves for reducing the
sound emissions on the discharge side of the turbocharger. The
silencer may be plugged onto a short pressure hose directly at the
outtake of the turbocharger and fixed, e.g. by means of a spring
band clamp.
[0039] The objective is also achieved by a method for manufacturing
a silencer having a pipe forming a flow duct as well as a first
resonator chamber and a second resonator chamber, each surrounding
the pipe and being arranged one behind the other in axial
direction, with the pipe in its shell having at least one first
opening which opens into the first resonator chamber, and at least
one second opening, which opens into the second resonator chamber.
The method is characterized by that a first housing part and a
second housing part, each having a recess for the flow duct, and
each having a shell which is designed around an axis, and can be
slid inside one another telescopically along the axis, are provided
for forming the resonator chambers, and the length of the shell of
the one housing part as seen in axial direction is at least the
half of the length of the other housing part, and the shell
exterior face of the first housing part rests against the shell
interior face of the second housing part in the different
telescopic positions, and that the prefabricated housing parts are
telescopically slid inside one another to a defined extent in order
to form the resonator chambers and to adjust a defined resonator
volume of a resonator chamber.
[0040] As already stated above, the large advantage of the
invention resides in the fact that the silencer is made of
originally separated housing parts which can be telescoped inside
one another to a large extent. For this purpose, the lengths of the
shells of the housing parts are accordingly dimensioned (shell
length of one housing part is at least the half of the shell length
of the other housing part). The continuous pipe, that supports the
housing parts in assembled state of the silencer or whereon they
rest, ensures that the silencer only requires a few components.
[0041] In order to achieve a certain resonator volume of a
resonator chamber, it is only required for the first housing part
to be slid inside the second housing part to the desired extent.
The shell faces resting against one another already form a kind of
form-fitting connection which can also be reliably sealed by way of
a force-locked connection or by welding.
[0042] It is possible that a different resonator volume is required
for another application or for meeting customer requirements. In
contrast to prior art it is according to the invention not required
to provide differently dimensioned components. It is rather
possible to use the same housing parts. Only the extent to which
the housing parts are slid inside one another is different from the
other application. It is thus possible to use standardized and
consequently cost-efficiently produced (identical) housing parts
for embodying different resonator volumes.
[0043] It is preferred that the pipe is embodied to be continuous
and that the housing parts are slid on the pipe, so that the pipe
passes through the recesses of the housing parts, with the result
that a reliable construction which is easy to produce is
achieved.
[0044] It is preferred that the housing parts are welded to one
another once the resonator volume of a resonator chamber has been
adjusted by sliding the housing parts inside one another, with the
result that a reliable and air-tight connection is achieved.
[0045] It is preferred that the prefabricated housing parts have an
end face on each side facing away from the overlapping region,
which end face can have a recess corresponding to the external
diameter of the pipe and the housing parts are slid onto the pipe,
so that the at least one first opening opens into the first
resonator chamber and the at least one second opening opens into
the second resonator chamber.
[0046] It is preferred that the housing parts are prefabricated as
pot-shaped parts the bottoms of which have a recess for the pipe.
This can e.g. achieved by deep-drawing.
[0047] It is preferred that one of the housing parts is provided
with a separating wall, which--in an assembled state--separates the
first resonator chamber from the second resonator chamber. The
separating wall can be prefabricated together with the concerned
housing part, so that only an assembly of the individual components
has to be performed. The position of the separating wall in the
housing part is responsible for the volume of the other resonator
chamber. It is possible for the separating wall to be inserted into
the housing part at the desired place as a separated part, e.g. as
an annular wall having a flanged edge, and connected to the housing
part, e.g. by welding.
[0048] It is preferred that the region of the pipe which is
surrounded by the resonator chambers is formed from a first part of
pipe and a second apart of pipe, the end sections of which are slid
inside one another, and the first housing part surrounds the first
part of pipe and the second housing part surrounds the second pipe
section.
[0049] It is preferred that at least one of the parts of the pipe
are formed integrally with the housing part surrounding it,
preferably by way of deep-drawing a piece of sheet metal.
[0050] It is preferred that in the overlapping region, at least one
circumferentially extending sealing ring is inserted between the
shell exterior face of the first housing part and the shell
interior face of the second housing part.
[0051] The invention thus allows the provision of a modular system
of a silencer for manufacturing a silencer having a pipe, with the
silencer having at least one first opening and at least one second
opening in its shell, which second opening is axially spaced apart
from the first opening, as well as having a first housing part and
a second housing part which each have a recess for the passage of
the pipe or the flow duct, with the housing parts being capable of
being slid telescopically inside each other, so that at least parts
of their shells overlap, with the shell exterior face of the first
housing part resting against the shell interior face of the second
housing part in the overlapping region, and the housing parts can
be slid onto the pipe, so that the pipe passes through the
recesses.
[0052] For a better understanding of the invention the latter is
explained in more detail with reference to the following
figures.
[0053] The heavily simplified schematics show:
[0054] FIG. 1 a silencer according to the invention;
[0055] FIG. 2 a first and a second housing part before
assembly;
[0056] FIG. 3 the housing parts from FIG. 2 in assembled state;
[0057] FIG. 4 the housing parts from FIG. 2 in assembled state with
a smaller resonator volume of the first resonator chamber being
embodied as compared to FIG. 3;
[0058] FIG. 5 a vehicle having a turbocharger silencer according to
the invention;
[0059] FIG. 6 a variant of a silencer according to the invention in
cross-section;
[0060] FIG. 7 the silencer from FIG. 6 in perspective view.
[0061] It must first be stated that in the various embodiments
described, identical parts have been marked with the same reference
identifiers and the same parts descriptions. It is therefore
possible to transfer the disclosures contained in the overall
description to the identical parts with the same reference
identifiers or the same parts descriptions. The selected
positioning terms are used in the description, such as top, bottom,
side etc., which refer directly to the described and the depicted
figures and which can be correspondingly transferred to the new
position in the event of a change in position. Furthermore,
individual characteristics or combinations of characteristics from
the various embodiments shown and described can present independent
or inventive solutions, or solutions according to the present
invention.
[0062] The embodiments illustrated as examples represent possible
variants of the silencer, and it should be pointed out at this
stage that the invention is not specifically limited to the
variants specifically illustrated, and instead the individual
variants may be used in different combinations with one another and
these possible variations lie within the reach of the person
skilled in this technical field given the disclosed technical
teaching. Accordingly, all conceivable variants which can be
obtained by combining individual details of the variants described
and illustrated are possible and fall within the scope of the
invention.
[0063] For the sake of good order, finally, it should be pointed
out that, in order to provide a clearer understanding of the
structure of the silencer, it and its constituent parts are
illustrated to a certain extent out of scale and/or on an enlarged
scale and/or on a reduced scale.
[0064] The fundamental function of the independent inventive
solutions can be taken from the description.
[0065] FIG. 1 shows a silencer 1 according to the invention, which
is formed from a continuous pipe 2 and from two resonator chambers
14, 15 surrounding the pipe 2. The pipe 2 is a flow duct, i.e. the
medium is lead therein between the entrance and the exit of the
silencer 1. Should the silencer be downstream a turbocharger, the
medium lead is compressed air. The pipe 2 continuously extends
between a first pipe section 11 and second pipe section 12. First
and second pipe section 11, 12 extend on both sides outside (or at
least partially outside) the resonator chambers 14, 15 and form the
entrance and the exit of the silencer 1.
[0066] The shell 3 of the pipe 2 has first openings 7 spread across
the circumference and opening into the first resonator chamber 14,
and second openings 8 spread across the circumference and opening
into the second resonator chamber 15. The first openings 7 and the
second openings 8 are of different size. Also the volumes of the
two resonator chambers 14, 15 are of different size. The resonator
chambers 14, 15 are formed from a first housing part 4 and a second
housing part 5. This being the case, the housing parts 4, 5 are
slid into one another, so that the shells of the housing parts 4, 5
overlap in an overlapping region 6. This being the case, the shell
exterior face 4a of the first housing part 4 rests against the
shell interior face 5b of the second housing part 5. It is
preferred that the shells of the housing parts 4, 5 are welded to
one another in the overlapping region 6, so that the resonator
chambers 14, 15 are sealed to be airtight to the outside.
[0067] In the second housing part 5, there is additionally a
separating wall 20, which separates the resonator chambers 14, 15
from each other thus creating volumes independent thereof. The
separating wall 20 is embodied to be an annular wall having a
flanged exterior edge which is welded to the shell interior face
5b, and a flanged interior edge which rests against the exterior
face of the pipe 2 in a loose manner or is also welded thereto.
[0068] The housing parts 4, 5 are cylindrical, each having one end
face 9, 10 facing away from the overlapping region 6. Recesses 21,
22 are embodied in the end faces 9, 10 where the pipe 2 passes
through, i.e. protrudes to the outside. The recesses 21, 22
preferably correspond to the external diameter of the pipe 2, and
it is preferred that in this section, an airtight sealing between
the housing parts 4, 5 and the pipe 2 is created. The profiles 16,
17 which will be described in more detail below contribute to this
sealing.
[0069] The housing parts 4, 5 are held, preferably clamped, between
profiles 16, 17. The profiles 16, 17 are each embodied or fixed to
the pipe sections 11, 12 extending on both sides of the silencer 1
outside the resonator chambers 14, 15. It is also possible for
these profiles to be simultaneously embodied for serving as a
possibility to connect a further pipe or a hose connection, in
particular for allowing an air-tight sealing of a line here.
[0070] For the sake of completeness, in FIG. 1 also the shell
exterior face 5a of the second housing part 5 and the shell
interior face 4b of the first housing part 4 are indicated. The
shell thickness of both housing parts 4, 5 is continuously
constant. The external diameter of the first housing part 4
essentially corresponds to the internal diameter of the second
housing part 5. The edge of the second housing part 5 has a
circumferential beading 13 which makes it easier to insert the
first housing part 4 into the second housing part 5.
[0071] The principle of manufacturing a silencer 1 according to the
invention can now be described on the basis of the FIGS. 2 to 4.
During the process of manufacturing, firstly, two housing parts 4,
5 which can be telescopically slid inside each other are provided.
For this purpose, the shell exterior face 4a of the first housing
part 4 and the shell interior face 5b of the second housing part 5
have a cross-sectional contour which is constant as seen in axial
direction.
[0072] The pre-produced housing parts 4, 5 already have recesses
21, 22 for letting the pipe 2 pass through. While the silencer 1 is
being assembled, the two housing parts 4, 5 are slid inside each
other and the extent as to how far they are inserted into each
other is determined by the resonator volume to be achieved.
According to application or for meeting customer's requirements,
this modular system allows adjusting any desired resonator volume.
It is not necessary to produce specific or individually dimensioned
components. It is only required to take into consideration the
extent to which the components are inserted into one another during
assembly, whereas the housing components used are always embodied
to be identical.
[0073] For the sake of simplicity, the pipe 2 is not shown in FIGS.
2 to 4. It is possible for the two housing parts 4, 5 to be slid
onto the pipe 2 from opposite directions before being inserted into
each other. It is alternatively possible to insert the two housing
parts 4, 5 into each other at first and to slide them onto the pipe
2 afterwards.
[0074] The separating wall 20 accommodated in one of the housing
parts 5 can also be inserted and fixed at the desired distance to
the corresponding end face 10 during manufacture of the housing
parts, so that also any variation of the volume of the second
resonator chamber 15 is allowed.
[0075] FIG. 3 shows a variant where the volume of the first
resonator chamber 14 is relatively great. It can e.g. be desired
for another application that the resonator volume is designed to be
smaller. For achieving this, it is according to the invention only
required to slide the first housing part 4 a little further into
the second housing part 5 during manufacture, so that a situation
according to FIG. 4 results.
[0076] The length L1, L2 of the shells as seen in axial direction
(as well as the position of the separating wall 20) defines how far
the housing parts 4, 5 can be slid inside each other. It is
preferred that the length L1, L2 of the shell of one of the housing
parts 4, 5 is at least the half of the shell L2, L1 of the shell of
the other housing part 5, 4. In particularly preferred embodiments,
the lengths L1, L2 of the shells brought in line with each other to
a larger extent and the length L1 of the one shell is at least one
third, particularly preferably three quarters, of the length L2 of
the other shell. The embodiment shown in FIG. 1, the shells of the
two housing parts 4, 5 are essentially of the same length.
[0077] The housing parts 4, 5 are preferably made of sheet metal,
in particular stainless steel sheets. This being the case, the
pot-shaped housing parts 4, 5 are deep-drawn metal sheets.
[0078] FIG. 5 finally shows a vehicle 19 having a turbocharger 18
and a silencer 1 attached to the discharge side of the turbocharger
18. This represents a preferred application field of the silencer 1
according to the invention.
[0079] FIG. 6 shows a preferred variant of a silencer 1 according
to the invention. Here, the region of the pipe 2 surrounded by the
resonator chambers 14, 15 is formed from a first part of pipe 2a
and a second part of pipe 2b with the first housing part 4
surrounding the first part of pipe 2a, and the second housing part
5 surrounding the second part of pipe 2b. The first openings 7 are
situated in the shell of the first part of pipe 2a and the second
openings 8 are situated in the shell of the second part of pipe 2b.
The end regions of the parts of pipe 2a, 2b are slid inside each
other. The extent of the telescoping is determined by the
overlapping of the housing parts 4, 5 and thus by the resonator
volume.
[0080] In this embodiment, the silencer is composed of two halves,
and the telescoping of the housing parts involves the telescoping
of the parts of pipe.
[0081] The second part of pipe 2b is integrally formed with the
housing part 5 surrounding it and preferably made of a deep-drawn
piece of sheet metal.
[0082] This one-part piece additionally forms a projection 23 which
rests against a pipe section 12 at least partially extending
outside the resonator chambers 14, 15 and is held by a profile 17,
preferably a spring clip, from outside, with the result that the
projection 23 is arranged between the pipe section 12 and the
profile 17 as seen in radial direction.
[0083] The separating wall 20 is integrally formed--preferably from
a deep-drawn piece of sheet metal--with the first part of pipe 2a,
which is slid onto the other part of pipe 2b. On this basis, an
opposed variation of the resonator volumes of both resonator
chambers 14, 15 is allowed (see FIG. 6).
[0084] In the following, an aspect of the invention will be
described, which is also applicable to the embodiments of FIGS. 1
to 4. At least one circumferentially extending sealing ring 24 is
inserted in the overlapping region 6 between shell exterior face 4a
of the first housing part 4 and the shell interior face 5b of the
second housing part 5.
[0085] This being the case, the shell of the first housing part 4
and/or the shell of the second housing part 5 has an annularly
extending holding 25 for the sealing ring 24, and it is preferred
that the holding 25 is formed by a bow-shaped course of the
shell.
[0086] Referring to FIG. 6 attention is drawn to the fact that it
is possible that at least one of the pipe sections 11, 12 running
outside the resonator chambers can be embodied as a component
separated from the internal pipe 2 and fixed thereto. Additionally
or alternatively, it is possible that at least one of the two pipe
sections 11, 12 are integrally formed with a housing part 4, 5.
[0087] FIG. 6 e.g. shows the (left) pipe section 11 being
integrally formed with the first housing part 4, preferably from a
deep-drawn piece of sheet metal.
[0088] The (right) pipe section 12 is embodied as a separated
component and connected to the pipe (here the second part of pipe
2b).
[0089] FIG. 7, finally, shows the outside of a silencer having a
very compact design.
LIST OF REFERENCE NUMERALS
[0090] 1 Silencer [0091] 2 Pipe [0092] 2a First part of pipe [0093]
2b Second part of pipe [0094] 3 Shell [0095] 4 First housing part
[0096] 4a Shell exterior face [0097] 4b Shell interior face [0098]
5 Second housing part [0099] 5a Shell exterior face [0100] 5b Shell
interior face [0101] 6 Overlapping region [0102] 7 First opening
[0103] 8 Second opening [0104] 9 End face [0105] 10 End face [0106]
11 First pipe section [0107] 12 Second pipe section [0108] 13
Beading [0109] 14 First resonator chamber [0110] 15 Second
resonator chamber [0111] 16 Profile [0112] 17 Profile [0113] 18
Turbocharger [0114] 19 Vehicle [0115] 20 Separating wall [0116] 21
Recess [0117] 22 Recess [0118] 23 Projection [0119] 24 Sealing ring
[0120] 25 Holding [0121] L1 Shell length [0122] L2 Shell length
* * * * *