DE102009007735A1 - Double-flow turbine housing for exhaust gas turbocharger of e.g. internal combustion engine, has guide vane arranged in transfer region between spiral channel and space, and intermediate wall sectionwise integrally designed with vane - Google Patents

Abstract

The housing (10) has spiral channels (12, 16) coupled with an exhaust manifold of a drive unit. One of the channels is delimited by the other channel by an intermediate wall (14). A turbine wheel (18) is arranged downstream to the spiral channels in a receiving space and loaded with exhaust gas. The wheel is rotatable around a rotational axis (A). A guide vane (20) is arranged in a transfer region between one of the channels and the receiving space. The intermediate wall is sectionwise integrally designed with the vane. An independent claim is also included for a method for manufacturing a turbine housing for an exhaust gas turbocharger of a drive unit.

Description

The The invention relates to a turbine housing for an exhaust gas turbocharger Drive unit, with a first spiral channel and with a second spiral channel, which can each be coupled to an exhaust tract of the drive unit are, with an intermediate wall, by means of which the second spiral channel is delimited from the first spiral channel, with a receiving space for a downstream the spiral channels can be arranged, with exhaust gas acted turbine wheel, which um a rotation axis is rotatably receivable in the turbine housing, and with one in a crossing area arranged between at least one of the spiral channels and the receiving space Guide grid.

One Such turbine housing is in the form of a double-flow turbine housing of the prior art known.

By the perpetual intensification of emission limit values, in particular for nitrogen oxides and soot also the requirements for exhaust gas turbocharger or supercharged internal combustion engines. For example, there are growing demands in terms of the boost pressure provision via medium to high load requirement ranges of the internal combustion engine, whereby exhaust gas turbochargers are geometrically increasingly reduced have to. Demanded high turbine performance of exhaust gas turbochargers are with In other words, by increasing the Aufstaufähigkeit or by a reduction in the absorption capacity of the exhaust gas turbocharger implemented in interaction with the respective internal combustion engine. In order to counteract a reduction in the efficiency of the turbine, has the provision of a Leitgitters in the crossing area between at least a spiral channel and the turbine wheel proved to be advantageous.

A further influencing the performance of an exhaust gas turbocharger results from exhaust aftertreatment devices arranged in the exhaust tract downstream of the turbine, which a particle filter, a catalyst and / or an SCR system may include (SCR = selective catalytic reduction, selective catalytic reduction). such Exhaust gas aftertreatment devices lead to an increase in pressure an outlet side of the turbine housing and the exhaust gas turbocharger. Around a for providing a satisfactory performance of the exhaust gas turbocharger sufficient turbine pressure gradient To obtain the pressure upstream of the turbine must be increased. As a turbine pressure gradient Here is the quotient of the pressure before the turbine and the pressure determined by the turbine.

One Laying out the turbine size too special small values can indeed be the power requirement of the compressor side satisfy the exhaust gas turbocharger, but goes with lower efficiencies accompanied by the turbine. A certain improvement, especially for internal combustion engines with exhaust gas recirculation systems, offer here from the prior art known exhaust gas turbocharger, their turbine housing two independent each other with exhaust gas flow through and usually comprise asymmetrically formed spiral channels. The spiral channels are each with different exhaust gas lines of the exhaust tract of the internal combustion engine coupled. However, here too the spiral channels of such turbine housings have meanwhile Spiral sizes achieved, due to wall friction and due to the small dimensions too much high flow losses to lead. In addition, there are regarding the exhaust gas recirculation capability in conjunction with the required combustion air of the internal combustion engine especially in the lower to medium speed range certain problems.

task The present invention is a turbine housing of to create the aforementioned type, in which a flow can be reached with exhaust gas with comparatively low flow losses.

These The object is achieved by a turbine housing having the features of the patent claim 1 solved. Furthermore, this object is achieved by a method for manufacturing a turbine housing solved with the features of claim 12. Advantageous embodiments with appropriate training of the invention are in the dependent claims specified.

at the turbine housing according to the invention for a Exhaust gas turbocharger of a drive unit, with a first spiral channel and with a second spiral channel, each with an exhaust tract of the drive unit can be coupled, is the second spiral channel delimited from the first spiral channel by means of an intermediate wall. The turbine housing includes a receiving space for a downstream the spiral channels can be arranged, with exhaust gas acted turbine wheel, which um a rotation axis is rotatably receivable in the turbine housing. In a crossing area between at least one of the spiral channels and the receiving space arranged a guide grid, wherein the intermediate wall at least partially in one piece with the guide grid is formed.

The delimitation of the two spiral channels from each other can therefore be achieved by means of a piece prefabricated with the guide grille part, whereby a particularly precise separation of the spiral channels can be specified. In particular, it is possible here to rework the integrally prefabricated part prior to connection to the turbine housing, so as to keep the transition area and / or the guide grid within predetermined, due to thermodynamic conditions tolerances. In such a post-processing, in particular a chip-removing method can be used. In particular, by such, precise reworking is a Durchströmtwerden the turbine housing with exhaust gas with relatively low flow losses and consequently achievable with a particularly high efficiency.

in this connection can the intermediate wall of a tongue area, at which the crossing of the exhaust gas out of the spiral channel out onto the turbine wheel, formed integrally with the guide grid to an inlet flange of the turbine housing be. At the inlet flange of the turbine housing is a the respective Spiral channel associated strand of the exhaust tract with the respective Spiral channel can be coupled.

alternative can be provided that the intermediate wall partially in one piece with one the spiral channels comprehensive housing part of the turbine housing is trained. However, this is particularly the case with the tongue area to be joined portion of the intermediate wall in an advantageous manner one piece form with the guide grid and - for example by means of a Pouring method or by a positive connection - with the spiral channels comprehensive housing part connect to.

In alternative embodiments can also more than two spiral channels in the turbine housing be delimited from each other by means of respective intermediate walls.

When Drive unit for applying the turbine housing with In the present case, exhaust gas is also one of an internal combustion engine different system, for example a fuel cell system, used.

In Advantageously, the intermediate wall comprises an anchoring part embedded in the turbine housing. By means of the anchoring part is in particular a positive connection between reach the intermediate wall and the turbine housing, whereby a Particularly secure setting of the intermediate wall can be reached on the turbine housing is. The anchoring part can be used as an area of the intermediate wall widened cross section executed be which - for example in the casting process - in the turbine housing is embedded. Also a hook-shaped design of the anchoring part or forming a T-profile is possible. Is the partition form-fitting with the turbine housing connected, so can mechanical stresses in the partition by sliding be dismantled in the storage area.

In have a further advantageous embodiment of the invention that, in particular as a precision casting or Genaugussteil trained, Leitgitter and the intermediate wall at least partially the same Material, in particular cast steel, on. By choosing similar Materials is a connection of the guide grid and the intermediate wall by welding and / or pouring to do very well. As a cast steel material, for example the material 1.4849 are used. Such a steel casting material draws Among other things by particularly high crack-free.

are Both the intermediate wall and the guide grid of a cast steel material formed, so the gas-tight connection of the castings is facilitated. Thermodynamically particularly good results are then achievable, if the guide grid and the intermediate wall as a precision casting or Genaugussteil are formed. Such a precision casting or Genaugussteil points, namely a very high accuracy.

According to one further advantageous embodiment of the invention, the intermediate wall at least a compensation area, by means of which a different thermal expansion of components of the turbine housing at least is partially compensated. As such compensation area can a curvature or a sequence of multiple curvatures be provided in the intermediate wall. Temperature spreads through different thermal expansion of the spiral channels in cooperation with the intermediate wall forming portion of the turbine housing and of the Leitgitters can so without major increases in voltage be compensated. The compensation area can, in particular, be wave-shaped to have. Also, different relative strains between the spiral channels in cooperation forming with the intermediate wall region of the turbine housing, the Guideway and the partition itself are so very good manageable.

As a further advantage, it has been shown that the intermediate wall is at least partially formed of a metal sheet, which is connected to the guide grid, in particular gas-tight welded. When welding the intermediate wall formed by a metal sheet with the guide grid, an automatic welding method, for example based on a laser or electron beam welding process, can be used. Such, the intermediate wall and the guide grid integral integral part can then - in particular by pouring - are fixed to the turbine housing. Such an integral part is produced with particularly low manufacturing tolerances, that is, particularly precise. Alternatively, the intermediate wall can be positively connected to the guide grid. Due to the smooth surfaces of, for example, formed by means of a deep drawing sheet, also a flow loss of the exhaust gas when flowing through the spiral channels is particularly low.

Also with the turbine housing part providing the spiral channels in cooperation with the intermediate wall the intermediate wall can be positively connected.

alternative can the intermediate wall at least indirectly by pouring with the turbine housing part be connected. Here, the partition itself in the im Interaction with the partition between the demarcated spiral channels providing turbine housing part be poured. additional or alternatively it is conceivable, the intermediate wall with the guide grid to connect and such a one-piece integral part by pouring the Leitgitters in the turbine housing part to connect with this. In this way, a gas-tight separation the spiral channels and / or a gas-tight setting of the guide grid on the turbine housing part reachable. This is possible with a particularly high, especially over wide temperature ranges constant high, turbine efficiency.

at a further advantageous embodiment of the turbine housing is by means of, in particular a plurality of stationary vanes having Leitgitters in the crossing area between the first spiral channel and the receiving space a flow state is adjustable, which from one in the crossing area adjustable between the second spiral channel and the receiving space flow state is different. Through the Leitgitter is so asymmetrical Property of the turbine housing reachable. In particular, it may be provided here for the more pent-up Associate exhaust flow designed spiral channel an exhaust gas recirculation device. Out space limitations In this case, it makes sense to have this guide grid in the crossing area of the one Spiral channel to arrange, which is closer to a bearing housing than the second spiral channel. The bearing housing, which on the turbine housing can be fixed, serves here for receiving and supporting a shaft, which is rotatably connected to the turbine wheel.

By the relatively high damming of the exhaust gas in the first spiral channel, which the integrally formed with the intermediate wall guide grid has, it is possible to couple this spiral channel with a strand of the exhaust tract, from which exhaust gas the charge air is supplied becomes. By means of the first spiral channel associated Leitgitters is therefore a Aufstaufähigkeit the first spiral channel available, which can be used for efficient exhaust gas recirculation is.

To the Setting different flow conditions in the respective crossing area can the crossing area between the second spiral channel and the receiving space for the turbine wheel however, as a free ring nozzle be educated.

Prefers is, however, according to one Another embodiment of the invention, in the crossing area between the second spiral channel and the receiving space for the turbine wheel from the guide grid the first spiral channel different flow guide can be arranged. This may in particular be a flow guide, by means of which at least two different flow states in the crossing area between the second spiral channel and the receiving space for the turbine wheel are adjustable.

One such flow guide can as Vario device an axially displaceable guide grille, a Axial slide for different widths covering a Leitgitters or the like vario device. By means of such Vario device for adjusting the turbine geometry are in particular tuned to a variety of operating conditions of the turbine Flow conditions adjustable. In particular, a turbo-brake functionality (turbo-brake) can be achieved by means of such a flow-guiding element. to be provided. By reducing the flow-through cross section in the crossing area between the second spiral channel and the receiving space for the turbine wheel by means of the flow guide is when pulling the flow guide for the Turbobrake functionality an exhaust back pressure adjustable, which brakes on an output shaft of the Internal combustion engine acts.

In Advantageously, in this case, the flow element in the transition area arranged that spiral channel, which has an outlet channel of the turbine housing includes. On the side of this exit channel are less cramped space to provide the Vario device before than on a close to the bearing housing Side of the turbine housing.

As a further advantage, it has been shown, when a flow-through cross section of a demarcated by the intermediate wall first flood to a flow-through cross-section of a demarcated by the intermediate wall second flood to at least substantially the same. In such a double-flow and symmetrical turbine housing arise in an advantageous manner even in the exhaust gas recirculation used, so having integrally formed with the intermediate wall guide vanes, first spiral channel at most low flow losses.

By Providing the guide grid are nevertheless characteristics of an asymmetric Turbine accessible. in the so comparatively large, the integrally formed with the partition Leitgitter having, first spiral channel so the exhaust gas flows when operating the drive unit, in particular the internal combustion engine, especially low loss. The for a particularly good flow Accelerator of the exhaust gas is then provided by means of the Leitgitters achieved in a particularly short way.

Finally has it has proven to be advantageous if components of the turbine housing form fit with each other are connected. this makes possible a very exact manufacturing and especially very good finishing the individual components before assembly. Such a construction of the turbine housing also provides a high density of the connection of the components secure with each other. Another advantage is the cost-effective manufacturability the components of the turbine housing.

• a) Bereitstellen eines Turbinengehäuseteils mit wenigstens einem Spiralkanal, welcher mit einem Abgastrakt des Antriebsaggregats koppelbar ist, und mit einem Aufnahmeraum für ein stromabwärts des wenigstens einen Spiralkanals anordenbares, mit Abgas beaufschlagbares Turbinenrad, welches um eine Drehachse drehbar in dem Turbinengehäuse aufnehmbar ist,
• b) Bereitstellen eines Leitgitters, welches in einem Übertrittsbereich zwischen wenigstens einem Spiralkanal und dem Aufnahmeraum anordenbar ist, und Anordnen des Leitgitters an dem Turbinengehäuseteil, wobei das Leitgitter eine zumindest bereichsweise einstückig mit dem Leitgitter ausgebildete Zwischenwandung umfasst, mittels welcher eine erste Flut von einer zweiten Flut abgegrenzt wird.

According to a further aspect of the invention, the above-mentioned object is achieved by a method for producing a turbine housing for an exhaust-gas turbocharger of a drive unit, comprising the following steps:

• a) providing a turbine housing part with at least one spiral channel, which can be coupled to an exhaust tract of the drive assembly, and with a receiving space for a downstream of the at least one spiral channel can be arranged, can be acted upon with exhaust turbine wheel, which is rotatably received about an axis of rotation in the turbine housing,
• b) providing a guide grid, which can be arranged in a transfer area between at least one spiral channel and the receiving space, and arranging the guide grid on the turbine housing part, wherein the guide grid comprises an at least partially integrally formed with the guide baffle intermediate wall, by means of which a first flood of a second Tide is demarcated.

The for the Turbine housing according to the invention described preferred embodiments and benefits also apply to the inventive method for producing a turbine housing.

Further Advantages, features and details of the invention will become apparent the following description of preferred embodiments and with reference to the Drawings in which the same or functionally identical elements with identical reference numerals are provided. Showing:

1 a sectional view of a double-flow turbine housing for an exhaust gas turbocharger supercharged internal combustion engine, in which an integrally formed with the guide grid intermediate wall is connected by pouring with a housing part of the turbine housing; and

2 in a sectional view of another embodiment of a twin-bladed turbine housing, wherein the intermediate wall is formed of a metal sheet and welded to the guide grid, wherein an integral part of the guide grid and the intermediate integral part is connected by pouring with the housing part of the turbine housing.

An in 1 cut shown twin-bladed turbine housing 10 for an exhaust gas turbocharger of a supercharged internal combustion engine comprises a first spiral channel 12 , which by means of an intermediate wall 14 from a second spiral channel 16 is delimited. In a transition area between the first spiral channel 12 and a receiving space for a turbine wheel 18 is a guide grid 20 arranged. The turbine wheel 18 is rotatable about an axis of rotation A in the turbine housing 10 taken and out of the spiral channels 12 . 16 exiting exhaust gas of the internal combustion engine acted upon.

The first spiral channel 12 is bearing housing side, so near a connection flange 40 for connecting a bearing housing, not shown, to the turbine housing 10 educated. The bearing housing serves to receive and store a shaft 26 at which the turbine wheel 18 is determinable.

The Leitgitter 20 is in the embodiment of the turbine housing according to 1 integral with the intermediate wall 14 formed as precision casting of a steel casting material, for example, the material 1.4849.

One the spiral channels 12 . 16 comprehensive first part housing 32 of the turbine housing 10 is formed of the same cast steel material, but by means of a less accurate casting process, for example as a sand casting. In particular, due to the use of a similar material for the investment casting, which the guide grid 20 and the intermediate wall 14 includes, is connecting Leitgritter 20 and sub-housing 32 by means of the pouring so feasible that a particular gas-tight connection is achieved.

At the in 1 shown embodiment of the turbine housing 10 So it's the Leitgitter 20 integral with the intermediate wall 14 prefabricated as precision casting from the cast steel material. This precision casting can be used in the manufacture of the turbine housing 10 by pouring with the spiral channels 12 . 14 having first part housing 32 get connected. In addition to a wavy surface 42 the Leitgitters 20 ensures an anchoring part 44 the partition wall 14 , which may comprise, for example, the T-profile shown here, for a particularly secure cohesive bonding of the integral precision casting with the sub-housing 32 ,

The one-piece prefabricated, the Leitgitter 20 and the intermediate wall 14 Comprehensive part may be before connecting to the turbine housing 10 be reworked so as to the crossing area and the Leitgitter 20 within prescribed tolerances due to thermodynamic conditions.

The sub-housing 32 may be formed analogous to a housing of a single-flow turbine, so that alone the one piece with the guide grid 20 trained intermediate wall 14 for delimiting the spiral channels 12 . 16 takes care of each other. Alternatively, it is conceivable, starting from the turbine inlet flange in the sub-housing 32 to provide an intermediate wall, to which the formed as a precision casting part intermediate wall 14 when pouring the integral part is connected. In the flow direction of the exhaust gas through the spiral channels 12 . 16 is the one piece with the baffle 20 trained intermediate wall 14 formed extending up to the tongue area, at which the outlet of the exhaust gas from the spiral channels 12 . 16 he follows.

The Leitgitter 20 has fixed vanes in the present case 38 on. By means of fixed vanes 38 this is the first spiral channel 12 flowing exhaust gas in the crossing region between the spiral channel 12 and the receiving space for the turbine wheel 18 accelerate strongly by a short route. This is a very efficient flow of the turbine wheel 18 reachable.

The turbine housing 10 is formed in two parts, in which the spiral channels 12 . 16 comprehensive first part housing 32 an outlet channel 30 comprehensive second sub-housing 34 is determinable. The second part housing 34 has a die 36 in which serving as a flow guide or coupled to a flow guide axial slide as a Vario device is inserted. The axial slide can be designed as a guide grid.

By means of such, not shown here and, for example, vanes comprehensive Strömungsleitelements are in the crossing region between the second spiral channel 16 and the receiving space for the turbine wheel 18 different flow conditions adjustable. This gives a variability of the turbine. Thus, depending on the power requirement of the internal combustion engine, a different sized flow-through cross-section in the transition area between the second spiral channel 16 and the receiving space for the turbine wheel 18 be set so that over a very wide, especially low and medium speeds comprehensive speed range, the requirements for the provision of the charge air of the internal combustion engine can be met.

The in the matrix 36 of the second sub-housing 34 insertable axial slide, by means of which in the transition region between the second spiral channel 16 and the receiving space for the turbine wheel 18 Different flow conditions are adjustable, providing a turbobrake functionality (turbo brake) allows for braking the internal combustion engine.

A flow-through cross section through the intermediate wall 14 demarcated first tide 50 and a flow-through cross-section of a through the intermediate wall 14 delimited second flood 52 are essentially the same size here. As a result, flow losses due to the wall friction of the exhaust gas are comparatively low compared to a twin-flow asymmetric turbine.

Through the Leitgitter 20 is the first spiral channel 12 yet imparted a stowage capability, which benefits one at the first spiral channel 12 connectable exhaust system of an exhaust tract for efficient exhaust gas recirculation makes possible. In particular, by the accomplished, for example by means of pouring connecting the guide grid 20 with the sub-housing 32 In this case it is ensured that temperature-related different expansions of the spiral channels 12 . 16 forming components of the turbine housing 10 and the Leitgitters 20 do not lead to the efficiency of the turbine affecting leaks.

The present symmetrical double-flow turbine housing 10 thus has properties of an asymmetric turbine housing, but without having to buy the asymmetry with high flow losses of a spiral channel.

In the embodiment of the turbine housing 10 according to 2 form the intermediate wall 14 and the Leitgitter 20 also a one-piece ges integral part, which, for example, by pouring cohesively with the sub-housing 32 connected is. The intermediate wall 14 also has a, in this case hook-shaped, anchoring part 44 on.

However, unlike in 1 embodiment shown, the intermediate wall 14 formed from a thin sheet, which for producing the one-piece integral part gastight with the guide grid 20 is welded. In this case, an automatic laser or electron beam welding process can be used. The connection of the integral part to the sub-housing 32 done by pouring, both at the guide grid 20 as well as at the intermediate wall 14 for positioning the integral part relative to the sub-housing 32 suitable Eingussstellen are provided.

It is conceivable in an alternative embodiment of the turbine housing 10 the one-piece with the Leitgitter 20 trained intermediate wall 14 with the sub-housing 32 to be connected by pouring, and then when tying the Leitgitters 20 to the sub-housing 32 to use an automatic welding process, for example based on a laser or electron beam welding process.

As long as that the exit channel 30 comprehensive second part housing 34 of the turbine housing 10 not yet on the first part housing 32 is set, is to carry out the welding process comparatively much space available. Also bearing housing side are for welding the guide grid 20 with the sub-housing 32 sufficient space available.

Furthermore, the intermediate wall 14 at the in 2 shown embodiment of the turbine housing 10 a present wave-shaped compensation area 46 on. By means of this compensation area 46 are different thermal expansions of the part housing 32 , the Leitgitters 20 and the partition wall 14 compensated.

In alternative embodiments, the compensation area 46 have a different shape from the waveform shown here. As with the in 1 shown embodiment, the outlet channel 30 comprehensive sub-housing 34 the matrix 36 on, which is designed to receive the Vario element.

The Leitgitter 20 for one of the in 1 or 2 illustrated turbine housing 10 comprises a support ring, on which in the profile section drop-shaped, fixed vanes 38 are arranged.

Claims (12)

Turbine housing for an exhaust gas turbocharger of a drive unit, with a first spiral channel ( 12 ) and with a second spiral channel ( 16 ), which are each coupled to an exhaust tract of the drive unit, with an intermediate wall ( 14 ), by means of which the second spiral channel ( 16 ) from the first spiral channel ( 12 ) is delimited, having a receiving space for a downstream of the spiral channels ( 12 . 16 ) can be arranged, with exhaust gas acted turbine wheel ( 18 ) which is rotatable about an axis of rotation (A) in the turbine housing ( 10 ) and with one in a crossing area between at least one of the spiral channels ( 12 ) and the receiving space arranged Leitgitter ( 20 ), characterized in that the intermediate wall ( 14 ) at least in regions integrally with the guide grid ( 20 ) is trained. Turbine housing according to claim 1, characterized in that the intermediate wall ( 14 ) into the turbine housing ( 10 ) embedded anchoring part ( 44 ). Turbine housing according to claim 1 or 2, characterized in that, in particular formed as a precision casting or Genaugussteil, Leitgitter ( 20 ) and the intermediate wall ( 14 ) at least partially the same material, in particular steel casting material having. Turbine housing according to one of claims 1 to 3, characterized in that the intermediate wall ( 14 ) at least one compensation area ( 46 ), by means of which a different thermal expansion of components of the turbine housing ( 10 ) is at least partially compensated. Turbine housing according to one of claims 1 to 4, characterized in that the intermediate wall ( 14 ) is at least partially formed from a sheet, which with the guide grid ( 20 ), in particular gas-tight welded, is. Turbine housing according to one of claims 1 to 5, characterized in that the intermediate wall ( 14 ) at least indirectly by pouring with a turbine housing part ( 32 ) connected is. Turbine housing according to one of claims 1 to 6, characterized in that by means of, in particular a plurality of fixed guide vanes ( 38 ), Leitgitters ( 20 ) in the crossing area between the first spiral channel ( 12 ) and the receiving space a flow state is adjustable, which of one in the crossing area between the second spiral channel ( 16 ) and the receiving space adjustable flow state is different. Turbine housing according to one of claims 1 to 7, characterized in that in the crossing region between the second spiral channel ( 16 ) and receiving space for the turbine wheel ( 18 ) one of the guide grid ( 20 ) Different flow guide can be arranged. turbine housing according to claim 8, characterized in that by means of the flow guide at least two different flow conditions in the transition area adjustable are. Turbine housing according to one of claims 1 to 9, characterized in that a flow-through cross section of a through the intermediate wall ( 14 ) demarcated first flood ( 50 ) a flow-through cross-section of a through the intermediate wall ( 14 ) demarcated second flood ( 52 ) is at least substantially the same. turbine housing according to one of claims 1 to 10, characterized in that components of the turbine housing form fit with each other are connected. Method for producing a turbine housing ( 10 ) for an exhaust gas turbocharger of a drive unit, comprising the following steps: a) providing a turbine housing part ( 32 ) with at least one spiral channel ( 12 . 16 ), which is coupled to an exhaust tract of the drive unit, and with a receiving space for a downstream of the at least one spiral channel ( 12 . 16 ) can be arranged, with exhaust gas acted turbine wheel ( 18 ) which is rotatable about an axis of rotation (A) in the turbine housing ( 10 ), b) providing a guide grid ( 20 ), which in a transition area between at least one spiral channel ( 12 ) and the receiving space can be arranged, characterized by arranging the guide grid ( 20 ) on the turbine housing part ( 32 ), wherein the guide grid ( 20 ) an at least partially integral with the guide grid ( 20 ) formed intermediate wall ( 14 ), by means of which a first flood ( 50 ) from a second flood ( 52 ) is demarcated.