DESCRIPTION

The invention relates to a supercharging device according to the preamble of claim 1.

Supercharging devices of said type are known in the form of exhaust-gas turbochargers or electrical compressors which, in the case of turbochargers, have a turbine housing and a compressor housing and, in the case of electrical compressors, have a compressor housing.

To protect said housings against rupturing, it is known from DE 10 2004 018

987 to use so-called rupture belts or containment belts composed of the housing material for example in the spiral region, which creates the problem that the wall thickness in said region is greatly increased. This in turn can lead to space problems during the installation of the supercharging device, for example for the supercharging of drive assemblies such as internal combustion engines.

It is therefore an object of the present invention to provide a supercharging device of the type indicated in the preamble of claim 1 which has a rupture protection means which can be applied easily and in a space-saving manner. Additionally or alternatively, it is an object of the present invention to provide a supercharging device of the type specified in the preamble of claim 1 which permits acoustic deadening.

This object is achieved by the features of claim 1.

According to the invention, there is accordingly provided a coating as a rupture protection means and/or as an acoustic deadening means, which coating may be arranged at least in one subregion of the housing.

The dependent claims contain advantageous developments of the invention.

The coating may preferably be applied directly to the housing (both at the inside and/or at the outside).

Depending on the application, it is possible for only subregions of the housing to be equipped with the rupture protection means and/or the acoustic deadening means, or for the entire housing to be equipped with a corresponding coating.

Preferred materials for the coating are special polymers and/or highly porous nanostructures, organic or inorganic and hybrid polymer substances which, as stated, may either be applied directly to the housing or to the subregions thereof or else may be applied to suitable carrier materials, for example carrier plates. The coating is particularly preferably sprayed onto the carrier plate by means of a spraying device, though may also be painted or smoothed on.

The material of the coating may furthermore be admixed with fibers composed of different materials, which are distributed and arranged in a non-specific manner in the coating or the layer, or else may comprise one or more fiber mats of a variety of web forms and arrangements.

The layer thickness and the type of fibers may be selected on an application- specific basis. The coating may be applied either locally or over the entire component. The layer thickness and the type of fibers may vary on the same component, specifically in a manner dependent on the application and boundary conditions (for example installation space, acting forces, etc.).

If the coating is sprayed on directly, no additional fastening points are necessary.

One of the particular advantages of the invention can be seen in that, with the rupture protection coating according to the invention, the housing wall thickness can, in part, be considerably reduced, which makes it possible to realize considerably more lightweight and thin- walled housings.

Furthermore, a combination with thermal insulation and/or with the acoustic deadening means is likewise possible.

In a further particulars preferred embodiment, the coating may additionally be covered by a protective jacket, composed for example of sheet metal, plastics or foils, in order to protect the coating against abrasion and wear by foreign bodies.

Further details, advantages and features of the present invention become apparent from the following description with reference to the drawing. The single figure of the drawing shows, in schematically highly simplified form, a supercharging device 1 in the form of an exhaust-gas turbocharger. As already mentioned in the introduction, the supercharging device 1 may however also be an electrical compressor, for example, in which a compressor wheel arranged in a compressor housing is driven by means of an electric motor.

The embodiment illustrated in the figure, in the form of the exhaust-gas turbocharger 1, has a housing 2 which comprises a compressor housing 2A width compressor wheel 14, a bearing housing 2B in which a shaft 15 is mounted, and a turbine housing 2C with turbine wheel 16. In order to make it possible to realize a rupture protection means and/or an acoustic deadening means in this embodiment of the supercharging device 1, three coatings 3, 4 and 5 are illustrated by way of example in the figure in order to illustrate the different possibilities. As stated, said coatings are merely examples wherein subregions 6, 7 and 8 are equipped with the stated coatings 3, 4 and 5 respectively. As has likewise already been stated in the introduction, it would however also be possible for the entire compressor housing 2a and/or the entire turbine housing 2c to be equipped with a full coating.

The coating 3 is applied directly to the subregion 6 of the compressor housing 2a, specifically in this case to an outer surface 10. The layer thickness D shown by way of example for all of the coatings may be selected on an application-specific basis.

The coating 4 is arranged not directly on the turbine housing 2C but on a carrier, for example a carrier plate 12, and is fastened, for example adhesively bonded or screwed, together with said carrier 12 to an outer surface 11 of the turbine housing 2C.

The coating 5 is in turn applied directly, in this case to an inner surface 9 of the bearing housing 2B, as a deadening means. Said coating is, as an example which may also be used in the case of the other coatings 3 and 4, equipped with a protective layer or a protective jacket 13 which may for example be composed of sheet metal, plastics or a foil.

Furthermore, in the figure, a rupture protection means is provided by way of example for the volute 17 of the turbine housing 2C. Said rupture protection means has a rupture coating 21 on which, in this embodiment, there is in turn arranged a protective layer or a protective jacket 22. Said rupture protection coating 21 with its protective jacket 22 is fixed in a suitable manner to an outer surface 18 of the volute 17.

A further rupture protection means is applied to the turbine housing outlet 19 or to the outer surface 20 thereof. Said rupture protection means comprises a rupture protection coating 23, which in turn is equipped with a protective jacket or a protective layer 24. Said coating 23 is applied directly to the outer surface 20, as in the case of the rupture protection coating for the volute 17.

As already explained above, these are however merely examples which are not restrictive but which are merely intended to explain how the coatings according to the invention can be applied to all possible subregions of the housing 2 of the supercharging device 1.

In addition to the above written disclosure, reference is hereby explicitly made, for supplementation of said disclosure, to the illustration of the invention in the figure.

LIST OF REFERENCE SIGNS

1 Supercharging device

2 Housing

2A Compressor housing

2B Bearing housing

2C Turbine housing

3, 4, 5,

21, 23 Coatings

6, 7, 8 Subregions

9 Inner surface

10, 11,

18, 20 Outer surfaces

12 Carrier

13, 22, 24 Protective layer/protective jacket

14 Compressor wheel

15 Shaft

16 Turbine wheel

17 Volute

19 Turbine housing outlet

D Layer thickness