Turbocharger.

[0001] The invention relates to a turbocharger.

[0002]Aturbocharger has a turbine and a compressor. In the turbine of a turbocharger is a first medium, in particular exhaust gas, this is expanded and energy is recovered. In the compressor of the turbocharger is a second medium, in particular charge air, compressed, and the expansion of the first medium in the turbine using the recovered energy. The turbine housing and a turbine of a turbocharger has a turbine rotor. The compressor of the turbocharger compressor housing and a compressor the rotor has a. Turbine rotor and compressor rotor are coupled via a shaft, the bearing housing is mounted in a, wherein the bearing housing with the turbine casing on the one hand and on the other hand is connected to the compressor housing.

[0003] It is also known from practice, that the turbocharger turbine housing has a turbine flowing housing, on which the material to be relaxing, first medium can be supplied to the turbine rotor. The turbine housing and a nozzle ring of the turbine housing on an insert piece typically takes. On the insertion piece can be relaxed first medium of the turbine are discharged, wherein the insert radially outer adjacent rotor blades of the turbine rotor. The nozzle ring, the turbine guide apparatus or guiding grid or guide apparatus as described, has vanes, the direction of flow of the first medium are positioned upstream of the turbine rotor as viewed, and via which the first medium upstream of the turbine rotor is guided to relaxing.

[0004] Wherein the turbine flowing housing is known from practice with the bearing housing via a turbocharger typically Spannpratzen connection. Such a connection of the turbine flowing housing with the bearing housing is as critical to evaluate by construction, since between the turbine flowing housing and the bearing housing typically high temperature differences. The turbine flowing housing the relatively hot exhaust gas and thus is exposed to more thermally stressed than the bearing housing. Thereby there may be temperature-induced deformation in the connecting region between turbine flowing housing and come bearing housing, whereby the tightness of the connection between turbine flowing housing and bearing housing Spannpratzen impaired. There is a need for it, the turbine flowing housing on the bearing housing to secure better in this respect.

[0005] On this basis based on the present invention is, to provide a novel turbocharger. This task is solved by a turbocharger according to claim 1. The bearing housing of the turbine housing with the turbine flowing housing invention is connected via a compensation element. On the compensating element in the connection region between turbine flowing housing and bearing housing temperature-induced deformations can be compensated. The compensation element is radially flexible and resilient, so that the same can execute a radial elongation and therefore a temperature-induced displacement between turbine flowing housing and bearing housing receiving or can compensate.

[0006] The compensating element at a radially outer portion is preferably with the turbine flowing housing and at a radially inner portion connected with the bearing housing, wherein radially between these sections a folding bellows portion contoured or curved manner seen extending wall extends. Such a configuration and connection of the compensation member with the turbine flowing housing and bearing housing is particularly preferably.

[0007] According to another embodiment of the invention is the compensation element is made of a nickel-based alloy plant substance. Particularly preferably has the following composition in percent by weight nickel base alloy material on:

50.00 - 55.00% Ni (nickel), chromium (chromium) 17.00 - 21.00%, 4.75 - 5.50% niobium (of Nb), molybdenum (Mo-) 2.80 - 3.30%, 0.65 - 1.15% titanium (Ti is), 0.20 - 0.80% aluminum (a.i.), in the remainder iron (VU). Such a material for the compensating element at temperatures of more than 600 °c is also a sufficiently high creep resistance for the compensating element prepared. Turbine flowing housing and bearing housing can be made from metallic materials, as are usual in practice from the same known turbochargers.

[0008] Preferred refinements of the invention emerge from the dependent claims and the following description. Embodiments of the invention are, without being limited thereto, on hand of the drawing explained. It showed:

1 Figfig.: have a cut-out in the axial direction by a cross-section in the region of a turbine and a turbocharger bearing housing of the invention.

[0009] The invention relates to a turbocharger. A turbocharger has a turbine for expansion of a first medium, in particular for internal combustion engine exhaust gas expansion. A turbocharger having a compressor for compressing a second medium further on, in particular charge air, and utilizing the expansion of the first medium energy obtained in the turbine. The turbine has a turbine housing and a turbine rotor on top. The compressor has a compressor housing and a rotor compressor agree. The compressor rotor is coupled with the turbine rotor via a shaft, the bearing housing is mounted in a, between the turbine housing and the compressor housing wherein the bearing housing and the turbine housing and the compressor housing positioned with both is connected.

[0010] The above fundamental construction of a turbocharger is the expert familiar addressed here.

[0011] Figfig. 1 shows a section of a turbocharger bearing housing 1 in the region of the connection between the invention and a turbine flowing housing 2 of the turbine casing of a turbine. 1 Figfig. further shows a turbine rotor 3 and a shaft 4 in a cut out, wherein the turbine rotor 3 on the shaft 4 with a not-shown compressor is coupled to the rotor. 2 Have a bearing housing lid 5 of the bearing housing, the bearing housing 1 is connected with and axially between the turbine rotor 3 and the bearing housing 1 seen in sections is positioned.

[0012] The turbine flowing housing 2 guides the first medium to the turbine rotor 3 to relaxing, wherein in flow direction of the medium upstream of the turbine rotor 3 is a so-called first seen to relaxing nozzle ring 6 is positioned, also referred to as the turbine nozzle, wherein the nozzle ring of the turbine rotor 3 upstream of the turbine rotor 6 the medium to be fed through vanes of the nozzle ring 6 is guided 3.

[0013] The present invention provides a novel compound of the turbine flowing housing 2 here completely prepared with the bearing housing 1, namely via a compensation element 1 and turbine flowing housing 2 via the compensation element are so 7th bearing housing 7 connected to each other, wherein the compensating element is flexible and resilient in the radial direction, a temperature-related, and to compensate for different thermal deformation of bearing housing 1 turbine flowing housing 2. The compensating element 7 a temperature-compensating by its elasticity can radially expansion.

[0014] The compensating element with a radially outer section 7 is mounted with a radially inner portion 8 thereof on the turbine flowing housing 2 and 9 thereof connected with the bearing housing 1. Typically this is a screw connection between the compensation element 7 and the turbine flowing housing 2 each bearing housing or provided.

[0015] Between the two portions 8, 9 of the compensation member 7 has the same via a radially extending wall portion contoured or curved manner seen bellows 10th this wall 10 can bellows-like or accordion-radially deforming, radially to compensate for temperature-induced expansions.

[0016] The two sections 8, 9 of the compensation member 7 are approximately on the same position in the axial direction viewed axially. However seen a significant offset between the portions radially 8, 9, wherein the bellows segment type contoured or curved wall extending radially and partially axially extending partially with therebetween, curved portions extending.

[0017] Seen in flow direction of the first medium to the portion of the compensation member 7 8 engages relaxing at a portion of the turbine flowing housing 2 to 11, the upstream of the nozzle ring 6 is positioned. A portion 12 of the bearing housing 1, to which the portion of the compensation member 7 9 engages, is radially positioned on the radial height of the nozzle ring seen in about 6.

[0018] The compensation element 7 is made of a nickel-based alloy material produced.

[0019] Preferably has the following composition in percent by weight nickel base alloy material on:

50.00 - 55.00%

17.00 - 21.00%

4.75 - 5.50%

2.80 - 3.30%

0.65 - 1.15%

0.20 - 0.80%

0.00 to 1.00%

0.00 to 0.08%

0.00 to 0.35%

0.00 to 0.35%

0.00 to

The nickel (Ni is),

Chromium (chromium),

Niobium (of Nb),

Molybdenum (Mo is),

Titanium (Ti is),

Aluminum (a.i.),

(Carbon) of cobalt,

Carbon (carbon),

Of magnesium (mg of),

Silicon (Si is),

0.015% Phosphorus (para),

0.00 to 0.017% sulfur (seconds),

0.00 to 0.006% boron (b is)

0.00 to 0.30% copper (copper)

in the radical iron (VU).

[0020] Such a nickel-based alloy material at temperatures of more than 600 °c is also a good creep resistance on, so that a temperature of the compensation member 7 is not expected failure due to the.

[0021] The compensation element 7 provides not only for the compensation of temperature dependent expansions in the connection region between the bearing housing 1 and turbine flowing housing 2 radially, rather can also improve turbocharger of the same Contain type element safety. The turbine rotor 3 should rupture, kinetic energy of fragments may also be intercepted the compensating element 7.

[0022]

1 Bearing housing

2 Turbine flowing housing

3 Turbine rotor

4 Shaft

5 Housing cover layer

6 Nozzle ring

7 Compensation element

8 Portion

9 Section

10 Wall

11 Section

12 Portion