EXHAUST GAS TURBOCHARGER WITH AUXETIC STRUCTURES

Abstract

An auxetic material or auxetic structures in an exhaust gas turbocharger having a shaft and at least one compressor wheel arranged on the shaft, a turbine wheel and a housing in which the shaft, the compressor wheel, and the turbine wheel are arranged. At least one part of the housing includes an auxetic material with a negative Poisson's ratio.

Claims

1. An exhaust gas turbocharger comprising: at least two adjacent components; and one of an auxetic material or of an auxetic structure with a negative Poisson's ratio in or on the exhaust gas turbocharger between the at least two adjacent components configured to influence thermal and transient elongations.

2. The exhaust gas turbocharger of claim 1, wherein the auxetic material or the auxetic structure comprises an elastic connecting element arranged between the at least two adjacent components configured as two housing walls, in hollow spaces of components of the exhaust gas turbocharger or between the at least two adjacent components of the exhaust gas turbocharger adjoining one another.

3. An exhaust gas turbocharger comprising: a shaft; at least one compressor wheel arranged on the shaft; a turbine wheel; and a housing in which the shaft, the at least one compressor wheel, and the turbine wheel are arranged, wherein at least a part of the housing has an auxetic material with a negative Poisson's ratio.

4. The exhaust gas turbocharger according to claim 3, wherein the housing comprises: an inner housing wall; and an outer housing wall; wherein the auxetic material is arranged between the inner housing wall and the outer housing wall.

5. The exhaust gas turbocharger according to claim 3, wherein the auxetic material is entirely arranged in a region surrounding at least one of the at least one compressor wheel and the turbine wheel.

6. The exhaust gas turbocharger according to claim 3, further comprising: an elastic connecting element arranged between at least two adjoining components of the exhaust gas turbocharger, the elastic connecting element comprises the auxetic material.

7. The exhaust gas turbocharger according to claim 6, wherein the at least two adjoining components are directly connected to one another by the auxetic material.

8. The exhaust gas turbocharger according to claim 3, wherein cavities are provided in the housing that are filled with the auxetic material.

9. The exhaust gas turbocharger according to claim 3, wherein the auxetic material is one of coated on or applied to components of the exhaust gas turbocharger.

10. The exhaust gas turbocharger according to claim 3, wherein the exhaust gas turbocharger is a radial turbocharger, an axial turbocharger, a turboblower, or a turbine.

11. The exhaust gas turbocharger according to claim 4, wherein the auxetic material is entirely arranged in a region surrounding at least one of the at least one compressor wheel and the turbine wheel between the inner housing wall and the outer housing wall.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other advantageous further developments of the invention are marked in the subclaims or are shown by way of the figures in the following together with the description of the preferred embodiment of the invention. It shows:

[0024] FIG. 1 is a first schematic exemplary embodiment of the present invention; and

[0025] FIG. 2 is an alternative schematic exemplary embodiment of the present invention.

DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS

[0026] In the following, the invention is explained in more detail making reference to the FIGS. 1 and 2, wherein same reference characters in the figures point to same structural and/or functional features.

[0027] In FIG. 1, a first purely schematic exemplary embodiment of the present invention is shown. Shown is an extract of a housing 3 of an exhaust gas turbocharger with a rotor L (e.g. a turbine wheel T or a compressor wheel V) with rotor blades 7. The rotor L is arranged on a shaft 2 in the housing 3.

[0028] The housing 3 has an inner housing wall 4 and an outer housing wall 5, wherein an auxetic material M or an auxetic structure with a negative Poisson's ratio is arranged between the two housing walls 4, 5.

[0029] Between the rotor blades 7 and the inner housing wall 4 a gap S is provided as intended.

[0030] In the shown exemplary embodiment, the auxetic material M is entirely arranged in the region round about the rotor L between the housing walls 4, 5.

[0031] FIG. 2 shows an alternative schematic exemplary embodiment of the present invention. Shown are a component B1 and a component B2 of an exhaust gas turbocharger, wherein between the two adjacent, i.e. adjoining components B1, B2 of the exhaust gas turbocharger an elastic connecting element 10 is arranged, which consists of an auxetic material M or of an auxetic structure M with a negative Poisson's ratio. There, the two adjacent components B1, B2 are directly connected to one another by the auxetic material M.

[0032] In its embodiment, the invention is not restricted to the preferred exemplary embodiments stated above. On the contrary, a number of versions is conceivable which also makes use of the presented solution even with embodiments of fundamentally different type.

[0033] Thus, while there have shown and described and pointed out fundamental novel features of the invention as applied to a preferred embodiment thereof, it will be understood that various omissions and substitutions and changes in the form and details of the devices illustrated, and in their operation, may be made by those skilled in the art without departing from the spirit of the invention. For example, it is expressly intended that all combinations of those elements and/or method steps which perform substantially the same function in substantially the same way to achieve the same results are within the scope of the invention. Moreover, it should be recognized that structures and/or elements and/or method steps shown and/or described in connection with any disclosed form or embodiment of the invention may be incorporated in any other disclosed or described or suggested form or embodiment as a general matter of design choice. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto.