U.S. patent application number 10/897727 was filed with the patent office on 2005-01-27 for twin flow turbine housing.
Invention is credited to Claus, Hartmut, Mayer, Michael.
Application Number | 20050019158 10/897727 |
Document ID | / |
Family ID | 33483922 |
Filed Date | 2005-01-27 |
United States Patent
Application |
20050019158 |
Kind Code |
A1 |
Claus, Hartmut ; et
al. |
January 27, 2005 |
Twin flow turbine housing
Abstract
A twin flow turbine housing for two intake channels (13a, 14a)
separated from one another in terms of fluid technology and
intended for a fluid which is to be fed under pressure to a
turbine, for example of a turbocharger, consists of two
substantially symmetrical half-shells (13, 14) which between them
enclose a substantially flat partition (18). The two half-shells
(13, 14) and the partition (18) consist of sheet metal and are
welded to one another. The outer contours of the half-shells have
bent-over edges (20, 20') and notches (30') which are engaged by
extensions (30) of the partition (18), the extensions (30)
projecting outwards through the notches (30') to enable them, after
assembly of the half-shells, to be welded to the edges thereof.
This manufacturing technology can be used for uncontrolled
turbochargers and also for turbochargers controlled by a
bypass.
Inventors: |
Claus, Hartmut; (Rochester,
MI) ; Mayer, Michael; (Grunstadt, DE) |
Correspondence
Address: |
Borg Warner Inc.
Patent Department
Powertrain Technical Center
3800 Automation Ave., Ste. 100
Auburn Hills
MI
48326-1782
US
|
Family ID: |
33483922 |
Appl. No.: |
10/897727 |
Filed: |
July 23, 2004 |
Current U.S.
Class: |
415/204 |
Current CPC
Class: |
F05D 2220/40 20130101;
F01D 9/026 20130101 |
Class at
Publication: |
415/204 |
International
Class: |
F01D 001/02 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 23, 2003 |
EP |
03 016 529.4 |
Claims
1. A twin flow turbine housing (1) comprising two intake channels
(13a, 14a) separated in terms of fluid technology and adapted for a
fluid under pressure which is to be fed to a turbine wheel, wherein
the twin flow turbine housing (1) is formed from two half-shells
(13, 14) which are substantially symmetrical relative to one
another and between them enclose a partition (18).
2. The twin flow turbine housing according to claim 1, wherein the
two half-shells (13, 24) comprise sheet metal.
3. The twin flow turbine housing according to claim 1, wherein the
partition (18) comprises sheet metal.
4. The twin flow turbine housing according to claim 1, wherein the
two half-shells (13, 14) and optionally the partition (18) are
welded to one another.
5. The twin flow turbine housing according to claim 1, wherein the
partition (18) and the half-shells (13, 14) have outer contours
(13', 14', 18') adapted to one another.
6. The twin flow turbine housing according to claim 5, wherein the
outer contours (13', 14') of the half-shells have notches (30'),
and the outer contour (18') of the partition (18) has extensions
(30) which, on assembly of the half-shells with the partition, come
to rest in the notches (30') and are welded to one another in this
state.
7. The twin flow turbine housing according to claim 1, wherein the
outer contours (13', 14') of the half-shells have bent-over edges
(20, 20') which lie in the separation plane (A) and are welded to
one another.
8. The twin flow turbine housing according to claim 1, wherein the
half-shells have circular inner contours on which bent-over edges
(31) lying in the separation plane (A) are formed, which edges can
be connected in the same way as the outer contours by means of
notches (30) and extensions (30) and welding.
9. The twin flow turbine housing according to claim 1, wherein the
two intake channels (13a, 14a) have bypass orifices (17, 17')
leading to a bypass line (22), and in that this bypass line (22) is
divided into two part-bypasses by an extension (18') of the
partition (18).
Description
FIELD OF THE INVENTION
[0001] The present invention relates to a twin flow turbine housing
according to the precharacterizing clause of Claim 1.
BACKGROUND TO THE INVENTION
[0002] It is known that turbine housings of various kinds can be
used for turbines, such as, for example, the turbine part of a
turbocharger for motor vehicles.
[0003] In a conventional manner, typically used turbine housings
are those which are made of cast iron and which have a spiral
intake space for the combustion gases which are fed from the engine
via a manifold to the turbine part of a turbocharger, from where
they are then fed, for example through an annular gap which may
contain a mechanism for varying the flow geometry, to the turbine
wheel.
[0004] The spiral intake space surrounds the actual turbine space
and, together with it, forms the turbine housing in which the
turbine wheel and the mechanism for varying the geometry are
housed.
[0005] It has already been proposed to make the turbine housing
from sheet metal, advantageously in a double-walled design, in
order on the one hand to save weight but especially, and more
importantly, to prevent excessive cooling of the exhaust gases of
the engine in the case of a cold turbocharger, since the downstream
catalyst has to be heated as rapidly as possible to the operating
temperature by the exhaust gases in order to achieve its full
effect.
[0006] Part of the prior art, especially in the case of more
powerful engines, is the provision of two spiral intake channels to
the turbocharger, in particular for separating cylinder groups
whose valve opening characteristics do not correspond.
[0007] It has also been proposed to use a single turbine housing
for these two intake channel of a turbocharger which act in
parallel, the two spiral intake spaces being arranged, so to speak,
axially relative to one another, and the exhaust gases being fed
either downstream to a single turbine wheel of relatively large
turbochargers or to two different turbine wheels of two smaller
turbochargers acting in parallel, but no solution has been proposed
to date as to how such a twin turbine housing can be produced by a
simpler method than casting from a lighter material than cast iron,
for example sheet iron.
SUMMARY OF THE INVENTION
[0008] It is therefore the object of the present invention to
produce a twin turbine housing with acceptable effort and at
acceptable costs from sheet metal.
[0009] This object is achieved, according to the invention, by the
features mentioned in the characterizing clause of Claim 1.
[0010] A twin flow turbine housing corresponding to the present
invention may have half-shells which consist of sheet metal.
[0011] A twin flow turbine housing corresponding to the present
invention may furthermore have a partition comprising sheet
metal.
[0012] In a twin flow turbine housing corresponding to the present
invention, the two half-shells and optionally the partition may be
welded to one another.
[0013] In a twin flow turbine housing corresponding to the present
invention, the partition and the half-shells may have outer
contours adapted to one another.
[0014] In a twin flow turbine housing corresponding to the present
invention, the outer contours of the half-shells may have notches,
and the outer contour of the partition may have extensions, which,
when the half-shells are assembled with the partition, come to lie
in the notches and are welded to one another in this state.
[0015] In a twin flow turbine housing corresponding to the present
invention, the outer contours of the half-shells may have bend-over
edges which lie in the separation plane and are welded to one
another.
[0016] In a twin flow turbine housing corresponding to the present
invention, the half-shells may have circular inner contours on
which are formed bent-over edges which lie in the separation plane
and, like the outer contours, can be connected by means of notches
and extensions and welding.
[0017] In a twin flow turbine housing corresponding to the present
invention, the two intake channels may have bypass orifices leading
to a bypass pipe, and this bypass pipe is divided into two
part-bypasses by an extension of the partition.
BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The invention will now be explained in more detail with
reference to drawings, of which:
[0019] FIG. 1 shows a conventional cast iron twin flow turbine
housing in perspective view,
[0020] FIG. 2 shows a twin flow turbine housing according to the
invention, in the same view,
[0021] FIG. 3 shows a section parallel to the axis of a housing
according to FIG. 2, and
[0022] FIG. 4 shows a section perpendicular to the axis according
to FIG. 2.
DETAILED DESCRIPTION
[0023] FIG. 1 shows a conventional twin flow turbine housing for a
turbocharger. Such twin housings are used in relatively powerful
engines and serve for separating the exhaust gases of one group of
cylinders from the exhaust gases of another group of cylinders.
[0024] In a four-stroke engine, it is known that a cylinder can
have a plurality of valves and that these valves are subject to a
specific opening and closing cycle controlled, for example, by the
camshaft, different exhaust valves of the same cylinder opening at
different times in order to allow gases to flow out under different
pressure.
[0025] In the case of multicylinder engines, there will therefore
be phases in which, for example, a high-pressure exhaust valve of a
cylinder is open at the same time as a low-pressure exhaust valve
of another cylinder, both valves releasing exhaust gases into the
same manifold to the turbocharger. The result of this is that gases
of the high-pressure exhaust valve may flow back into the cylinder
whose low-pressure exhaust valve is open at the same time,
something which must be avoided.
[0026] FIG. 1 is a computer drawing of a known modern twin flow
turbine housing 1 for the two separate intake channels 2 and 3 to a
single turbine wheel which is not shown, which corresponds, as has
been explained above, to an embodiment of turbochargers for more
powerful engines.
[0027] The entire housing is made of cast iron, and clearly evident
are the two spiral intake channels 2 and 3, which have outer
contours 2' and 3' completely separated from one another up to the
gap 1', and of course also separate, exhaust gas-carrying
interiors, which lead radially to the single annular gap 1' and
thereby to one and the same turbine wheel which lies radially
inside the annular gap 1' and is not shown. Such a housing is
relatively complicated simply from the point of view of the casting
process and, also with respect to its weight, is by no means
optimally adapted to present-day requirements for fuel efficiency,
nor to the abovementioned requirement for optimum catalysis of the
exhaust gases. The housing according to FIG. 1 also contains a
bypass which can be closed by means of a valve 19.
[0028] FIG. 2, on the other hand, shows a twin flow turbine housing
(the term "twin" relates to the presence of two intake channels) in
which, viewed from the outside, only a single intake channel
appears to be present, but in reality, as shown in FIGS. 2 and 3,
the intake channel of this housing is divided by a partition 18
into two axially adjacent parts 13a and 14a, so that two intake
channels completely separated from one another operationally thus
form.
[0029] The twin turbine housing of FIG. 2 consists of a
double-walled structure, the division into two separate intake
channels relating only to the inner housing. The outer housing
consists of two parts 12 and 15, which are connected to one another
at 21. The inner housing consists of two half-shells 13 and 14
whose outer edges 20 and 20' are bent over parallel to the
separation surface A (cf. FIG. 3) and can thus be welded to one
another.
[0030] The housing of FIG. 2 furthermore has two connecting flanges
11 and 16 for connection to the catalytic converter and to the
central housing of the turbocharger.
[0031] Prior to welding, however, a partition 18 is placed between
the two half-shells 13 and 14, this partition having an outer
contour 18' which corresponds to the outer contours 13' and 14' of
the two half-shells 13 and 14, which outer contours are congruent
to one another.
[0032] Corresponding notches 30' are made in the outer contours 13'
and 14' of the half-shells 13 and 14 so that, on assembly of the
half-shells 13 and 14, and of the partition 18 located between
them, dovetail-like extensions 30 of the outer contour 18' of the
partition 18 come to rest in the notches 30', and, after assembly
of these three parts, first the two half-shells in the region of
the bent-over edge regions 20 and 20' and then the dovetail-like
extensions 30 of the partition, which project outwards through the
half-shells, can be welded to those edges 20, 20' of the
half-shells which have already been welded to one another.
[0033] This gives a rigid sheet metal structure consisting of two
channels which each correspond to the spaces 13a and 14a between
the half-shell 13 or 14 and the partition 18, and which are
adjacent in the region of the partition.
[0034] As shown in FIG. 4, the half-shells 13 and 14 do of course
also have bent-over edge regions 31 along their inner contours,
which form a circle within which the turbine wheel, which is not
shown, comes to rest. In the vicinity of the circular edge regions
31 of the half-shells 13 and 14, notches and extensions can of
course likewise have been formed, as in the outer regions.
[0035] As furthermore shown in FIG. 2, orifices 17 and 17', which
together complete a circle and which are provided for branching of
bypasses, are provided on the half-shells 13 and 14, these orifices
leading to a bypass line 22 which is formed by a pipe 17" welded to
the orifices 17, 17' and which can be closed by means of a flap
valve 19, by means of a lever 23 controllable from outside the
housing.
[0036] The partition 18 has an extension 18' which projects into
the bypass line and follows this up to the seat of the valve 19.
For this purpose, the bypass pipe 17" can likewise consist of two
half-shells, and the extension 18' of the partition 18 may have
further extensions 13 which engage, and are welded, in notches of
bent-over, axial edges of the half-shells of the pipe 17".
[0037] The invention has been described here in more detail above
with reference to a working example, but a large number of
possibilities are conceivable for permanently joining the two
half-shells of the twin turbine housing and the partition located
between them, without departing from or exceeding the scope of the
present invention.
* * * * *