WO2017071895A1

WO2017071895A1 - Compressor casing for a turbocharger

Info

Publication number: WO2017071895A1
Application number: PCT/EP2016/072808
Authority: WO
Inventors: Mark PAULOV; Andrew Armstrong; Heinrich Axt; Rolf DIERINGER; Martin HÖER
Original assignee: Continental Automotive Gmbh
Priority date: 2015-10-30
Filing date: 2016-09-26
Publication date: 2017-05-04
Also published as: DE102015221278A1

Abstract

The invention relates to a compressor casing for a turbocharger, comprising a base that includes an air intake region, a contoured region, a diffuser region and a spiraling channel region, and comprising a plastic part which is connected to the base in the contoured region of the base and which engages one or more recesses in the base.

Description

description

Compressor housing for a turbocharger The invention relates to a compressor casing for an exhaust gas turbocharger ^¬.

From DE 10 2007 009 781 B4 are a

Plastic compressor housing and a method for its production known. This plastic compressor housing has a Duroplastkörper to provide an intake manifold, a compressor duct and an outlet nozzle. The Duroplastkörper is at least partially covered by a Thermo ^¬ plast hood. The thermoset body is formed as a basic body. The thermoplastic is sprayed onto the Grundkör ^¬ per. On at least a first surface of the Duroplastkörpers a first anchoring element is ausgebil ^¬ det, wherein at least a second surface of the first Veran ^¬ kerungselements is substantially completely covered with the thermoplastic. These measures are intended to achieve an improved structural ^strength , in particular a separation of the thermoplastic from the thermoset base body even under extreme load conditions. The object of the invention is a

Specify compressor housing for an exhaust gas turbocharger, the load capacity is further increased.

This object is achieved by a compressor housing having the features specified in claim 1. Advantageous Substituted ^¬ staltungen and developments of the invention are specified in the dependent claims.

The present invention provides a compressor housing for an exhaust gas turbocharger, which has a

Base body and having a connected to the main body plastic component, wherein the base body an air inlet area, a contour area, a diffuser area and has a spiral channel region. The plastic component is connected in the air guide region of the body with this and engages in one or more recesses of the body. As a result, a firm bond is formed between the base body and the plastic component. Preferably, the recesses are implemented in such a manner that there is between the base ^¬ body and the plastic component, a bias voltage, based on which the relative position of the plastic component is fixed to the base body and at the same time DA good boundary conditions are for provided that the interconnected components both axial tensile or compressive forces as well as forces in the circumferential direction, ie shearing forces. Also in the case that the basic body and the plastic component un ^¬ terschiedliche material properties, in particular different thermal expansion coefficients, different thermal conductivities, etc., it is ensured that the existing from the base body and the plastic component assembly to occur during operation of the turbocharger heavy loads under all operating conditions withstand. This also applies to the occurrence of large temperature differences. Even in such a case, no detachment of the plastic component from the base body. Plastic ^¬ component and body always remain connected without play with each other so that no rattling noises occur between these components even under high stresses that drove at Be ^¬ the turbocharger would be undesirable.

Furthermore, in the case of a compressor housing equipped with the features according to the invention, the contour gap of the compressor housing is kept small. This is due, in particular, to the fact that the gap between compressor wheel and compressor housing can be selected smaller than with an aluminum housing if the plastic has properties (tri-bology, machinability) in such a way that the compressor wheel does not come into contact with the compressor wheel and plastic is damaged.

Further advantageous features of the invention will become apparent from the exemplification thereof with reference to the figures. It shows

FIG. 1 is a block diagram for explaining the basic structure of an exhaust gas turbocharger;

FIG. 2 is a longitudinal sectional view of a part of a compressor housing for explaining a first embodiment of the invention;

3 is a longitudinal sectional view of a part of a compressor housing for explaining a second ^exemplary embodiment of the invention;

FIG. 4 is a longitudinal sectional view of a part of a compressor housing for explaining a third ^exemplary embodiment of the invention;

5 is a longitudinal sectional view of a part of a compressor housing for explaining a fourth ^exemplary embodiment for the invention, FIG.

6 is a longitudinal sectional view of a part of a compressor housing for explaining a fifth ^exemplary embodiment for the invention, FIG.

7 is a longitudinal sectional view of a part of a compressor housing for explaining a sixth ^exemplary embodiment for the invention, FIG.

8 is a longitudinal sectional view of a part of a compressor housing for explaining a seventh ^exemplary embodiment of the invention;

9 is a longitudinal sectional view of a part of a compressor housing for explaining an eighth Ausfüh approximately for the invention,

10 is a longitudinal sectional view of a part of a compressor housing for explaining a ninth ^exemplary embodiment of the invention, FIG.

FIG. 11 is a longitudinal sectional view of a portion of a compressor housing for explaining a tenth ^embodiment of the invention;

Figure 12 is a longitudinal sectional view of a portion of a compressor housing for explaining an eleventh Ausfüh approximately for the invention and Figure 13 is a longitudinal sectional view of a portion of a compressor housing for explaining a twelfth ^exemplary embodiment for the invention. 1 shows a block diagram for explaining the basic structure of an exhaust gas turbocharger first

This exhaust-gas turbocharger 1 has a turbine 2, which contains a turbine wheel 4 arranged in a turbine housing 3. Furthermore, the exhaust gas turbocharger 1 to a compressor 5, which is arranged in a compressor housing 6

Compressor 7 contains. Furthermore, the exhaust gas turbocharger 1 has a bearing device 9, which contains a bearing housing 10, which is connected to the compressor housing 6 and the turbine housing 3. In the bearing housing 10, a shaft 8 is mounted, in one end of which the turbine wheel 4 and in the other end region of the compressor 7 is arranged. The tur ^¬ binenrad 4 and the compressor 7 may be attached to the shaft 8 or be an integral part of the shaft 8.

In operation of the turbocharger, a ^¬ the Abgasturbola the supplied exhaust gas stream of a motor vehicle drives the turbine wheel 4, whereby the shaft integral with the turbine wheel 4 is set into a rotational movement. 8 This Drehbewe ^¬ tion is transmitted to the also fixedly connected to the shaft 8 compressor 7. By means of the compressor wheel 7 is the compressor compresses 5 supplied fresh air and recycled together with the required fuel to the combustion chambers of the engine of the motor vehicle in order to increase the engine power to ^¬.

The invention relates to the use and attachment of a plastic component in a compressor housing, wherein by means of the plastic component of the contour gap, the compressor inlet ^¬ rittsbereich or the diffuser area or all enumerated areas at the same time the compressor housing optimized ^¬ who, for example, the contour gap is kept as small as possible. A compressor housing according to the invention has a base ^¬ body and connected to the body Kunststoffbau ^¬ part on. The main body has an air inlet area, a contour area, a diffuser area and a spiral channel area. In the base body may be one made of aluminum by a die-casting process or ingot molds ^¬ casting process Basic bodies produced. Alternatively, the base body can be made of a different light metal or thermoset materials. In which

Plastic component is, for example, thermal ^¬ plastering in amorphous or semi-crystalline structure or pourable thermosets or thermosetting plastics that belong to the class of moist polyester. The material properties of the base body and the plastic component, in particular the thermal expansion coefficient and hardness can be un ^¬ differently. Preferably, the material of the base ^¬ body is harder than the material of the plastic component, but has a smaller thermal expansion coefficient than the material of the plastic component.

The plastic component is preferably arcuate ^{ausgebil ¬} det and may extend on the one hand from the contour region to the beginning of the air inlet region and on the other hand from the contour region to the end of the diffuser region.

The plastic component is placed ^¬ injected onto the base body inside, and forms the contour region of the compressor housing such that the gap contour of the compressor housing, that the gap between compressor casing and compressor wheel is made small ge ^¬. A small contour gap has the advantage that the efficiency on the compressor side is increased. To increase the load capacity of the connection between the

Base body and the plastic component recesses are introduced into the base body, which are filled from the plastic material during spraying of the plastic component on the base body ^¬ . The artisanal inserted into the recesses Material material hardens in the recesses and increases in Be ^¬ drive the exhaust gas turbocharger, the stability of the body formed from the base ^¬ and the plastic component composite. In particular ^¬ sondere occurs no peeling of the plastic component of the basic body, whereby the shape of the contour gap remains and it does not even come to undesirable rattling noises.

The plastic component can advantageously axial tensile and compressive forces during operation of the exhaust gas turbocharger

Apply forces in the circumferential direction, which occur by applying a torque or a shear stress record. Even in the case that the base body and the plastic component have different thermal expansion coefficients, which consists of the main body and the Kunststoffbau ^¬ part composite ensures the desired mechanical stability of the compressor housing. This is due to the fact that radial, axial or radial-axial Zugkräf ^¬ te and / or shear forces are generated due to the eingebra ^¬ th in the recesses of the base ^¬ th plastic material between the base body and the plastic component, which bias the main body relative to the plastic component. By this biasing the relative positioning between the base body and the plastic component to be ensured and at the same boundary conditions for the capacity of ge ^¬ formed composite component with respect to the occurring during operation of the exhaust gas turbocharger ^¬ forces created.

Exemplary embodiments of the invention will be explained in more detail below with reference to FIGS. 2 to 13.

2 shows a longitudinal sectional view of a portion of a compressor housing 6 for explaining a first ^exemplary embodiment for the invention. Of this

Compressor housing, the main body 11 and the associated with the main body by an injection molding plastic component 17 are shown. The plastic component 17 is formed bo ^¬ genförmig and can in the entire air inlet region 12, in the contour region 13 and in the entire diffuser area 14th of the main body 11 are attached to this. The main body has in the air inlet region 12 a radially directed undercut 18, which is filled with the material of the plastic component 17 ^¬ . Further, in Figure 2 with the reference numeral 16, the Laufermittelachse the exhaust gas turbocharger, with the reference numeral 22, the axial direction and the reference numeral 23 illustrates the radial direction.

The number of undercuts 18 and their arrangement in the circumferential direction of the base body as well as their positioning in the air inlet area and their exact shape can be selected depending on the installation space.

These undercuts 18 can transmit forces in the radial direction by being subjected to tension, and transmit forces in the axial direction by being subjected to shear.

3 shows a longitudinal sectional view of a portion of a compressor housing 6 for explaining a second ^exemplary embodiment for the invention. This second exporting ^¬ approximately example differs from the first Ausführungsbei ^¬ play in that a a blind hole 19 re- ised recess is provided in the air inlet region 12 of the body 11 in place of an undercut 18, which is filled with the material of Kunstoffbauteils 17th Also this blind hole 19 is directed radially. Furthermore, the contour region 13, the diffuser region 14 and the spiral channel region 15 are shown in FIG.

4 shows a longitudinal sectional view of a portion of a compressor housing 6 for explaining a third ^exemplary embodiment for the invention. This third exporting ^¬ approximately example differs from the second exemplary embodiment play in that an opening formed as a groove 20 recess is in the air inlet region 12 of the body 11 in place of a blind hole 19 is provided, which is filled with the material of the plastic ^¬ material component 17th This groove 20 is directed radially. Furthermore, in FIG. 4, the contour area 13, the diffuser region 14 and the spiral channel region 15 are shown.

FIG. 5 shows a longitudinal sectional illustration of a part of a compressor housing 6 for explaining a fourth ^exemplary embodiment of the invention. This fourth exporting ^¬ approximately example differs from the previous embodiments in that the diffuser in the region 14

Base body 11 is provided in the axial direction extending undercut 21 in the base body 11, which is filled with the material of the plastic component 17. Furthermore, the air inlet region 12, the contour region 13 and the spiral channel region 15 are shown in FIG. FIG. 6 shows a longitudinal sectional illustration of a part of a compressor housing 6 for explaining a fifth ^exemplary embodiment for the invention. This fifth exporting ^¬ approximately example differs from the ge in the Figure 5 ^¬ showed embodiment in that in the diffuser portion 14 of the base body a which extends in the axial direction of the blind hole 19 is provided in the main body 11 11, which is filled with the material of the plastic component 17th Furthermore, the air inlet region 12, the contour region 13 and the spiral channel region 15 are shown in FIG.

FIG. 7 is a longitudinal sectional view of a part of a compressor housing 6 for explaining a sixth embodiment of the invention. This sixth From ^¬ operation example differs from that shown in the Figure 6 embodiment in that an axially extending groove 20 is provided in Diffusorbe- rich 14 of the base body 11, which is filled with the material of the plastic component 17th Furthermore, the air inlet region 12, the contour region 13 and the spiral channel region 15 are shown in FIG.

FIG. 8 shows a longitudinal sectional illustration of a part of a compressor housing 6 for explaining a seventh ^exemplary embodiment of the invention. This seventh The exemplary embodiment differs from the exemplary embodiments shown in the preceding figures in that recesses filled with the material of the plastic component 17 are provided both in the air inlet region 12 and in the diffuser region 14 of the base body 11. The recess provided in the air inlet region 12 is an undercut 18 directed in the radial direction. The recess provided in the diffuser region 14 is an undercut 21 directed in the axial direction. Furthermore, in FIG. 8, the contour region 13 is the spiral channel region 15 and the rotor center axis 16.

FIG. 9 shows a longitudinal sectional illustration of a part of a compressor housing 6 for explaining an eighth exemplary embodiment of the invention. This eighth exporting ^¬ approximately example differs from the ge in the figure 8 ^¬ exemplary embodiment shown in that ^¬ a blind hole 19 and the diffuser portion 14 of the base body 11, another blind hole 24 is provided in Lufteinlassbe rich 12, wherein both blind holes with the material of the plastic component 17 are filled. Furthermore, shown in Figure 9, the Konturbe ^¬ reaching 13, the spiral channel region 15 and the rotor center axis sixteenth FIG. 10 shows a longitudinal sectional illustration of a part of a compressor housing 6 for explaining a ninth ^exemplary embodiment of the invention. This ninth exporting ^¬ approximately example differs from the ge in Figure 8 showed ^¬ embodiment in that in the rich Lufteinlassbe- 12 and a groove 20 in the diffuser portion 14, a further

Groove 25 is provided, wherein both grooves are filled with the material of the plastic component 17. Furthermore, the contour region 13, the spiral channel region 15 and the rotor center axis 16 are shown in FIG.

FIG. 11 shows a longitudinal section of a part of a compressor housing 6 for explaining a tenth ^embodiment of the invention. This tenth exporting ^¬ approximate example differs from the previous execution Examples in that in the air inlet region 12 a realized in the form of an undercut 18 and filled with the Ma ^¬ material of the plastic component 17 recess vorgese ^¬ hen, which extends obliquely. This filled with plastic material recess can absorb forces in the axial and radial directions. Furthermore, FIG. 11 shows the contour region 13, the diffuser region 14 and the spiral channel region 15. FIG. 12 shows a longitudinal sectional illustration of a part of a compressor housing 6 for explaining an eleventh ^exemplary embodiment of the invention. This eleventh exporting ^¬ approximately example differs from the ge ^¬ showed in the Figure 11 embodiment in that rich 12 a realized in Lufteinlassbe- in the form of an undercut 26 and filled with the material of the plastic component 17 from ^¬ saving or sheath is provided at the provided from the contour region 13 distal end of the air inlet region and extends in the radial and axial directions. These filled with plastic material recess can absorb forces in the axial and radial directions. Furthermore, in FIG. 12, the diffuser region 14 and the spiral channel region 15 are shown. FIG. 13 is a longitudinal sectional view of a part of a compressor housing 6 for explaining a twelfth embodiment of the invention. This twelfth From ^¬ operation example differs from that shown in Figures 11 and 12 embodiments, in that in the transition area between the diffuser portion 14 and the spiral channel region 15 a realized in the form of an axially directed undercut 27 and the material of the plastic ^¬ component 17 filled recess is provided. Furthermore, the air inlet region 12, the contour region 13 and the diffuser region 14 are shown in FIG.

Alternatively to the above described Ausführungsbei play ^¬ it is also possible to provide recesses of different types in one and the same basic body, respectively are filled with the material of the plastic component 17 to provide the desired stable component composite, which remains free of play even at high load, so that no rattling noises occur.

This stable composite component is also given when the base body and the plastic component have different Wär ^¬ meausdehnungskoeffizienten. Has the plastic component a higher Wärmeausdehnungskoef ^¬ coefficient than the base body, the stable composite is ensured in the hot state of the components that the plastic component forms a press fit with the base body due to its higher Wärmeausdeh ^¬ expansion coefficient. In the cold state of the components, the synthetic resin member ^¬ attracts because of its higher thermal expansion coefficient ^¬ a greater degree than the main body, thereby exerting a pulling force on the example as background ^¬ sections realized recesses of the base body from. The tensile force on the undercuts produces a frictional force Zvi ^¬ rule the plastic component and the base body, which provides a frictional connection between the components of the composite. A positive connection is ensured by the structural design of the undercuts.

If the plastic ^{component has} a smaller coefficient of thermal expansion than the base body, then in the warm state the base body expands more strongly than the plastic component and exerts a tensile force or shear force on the plastic ^component due to the undercuts. This pulling force on the undercuts produces a frictional force between the plastic ^¬ fabric member and the base body, which provides a force-locking connection ^¬ between the components of the composite. The positive connection becomes the constructive

Design of the undercuts guaranteed. In the cold stand to ^¬ components of the base body contracts more than the plastic component and thereby forms a press ^¬ combined with the plastic component.

Claims

claims

A compressor housing for an exhaust gas turbocharger, comprising a base body (11) which has an air inlet area (12), a contour area (13), a diffuser area (14) and a spiral channel area (15), and one with the base body (11). connected plastic component (17), characterized in that the plastic component (17) in the contour region (13) of the base body (11) is connected thereto and in one or more recesses (18, 19, 20, 21, 24, 25, 26, 27) of the base body (11) engages.

2. compressor housing according to claim 1, characterized in that the recesses undercuts (18, 21, 26, 27), blind holes (19, 24) and / or grooves (20, 25).

3. compressor housing according to claim 1 or 2, characterized in that the plastic component (17) in the base body

(11) is injected inside.

4. compressor housing according to one of the preceding claims, characterized in that the base body (11) and the plastic component (17) are biased against each other.

5. compressor housing according to claim 4, characterized in that between the base body (11) and the plastic component (17) has a tensile force and / or a shearing force.

6. Compressor housing according to one of the preceding claims, characterized in that the plastic component (17) is formed gebo ^¬ gene and extends into the air inlet area

(12) and / or the diffuser region (14).

7. compressor housing according to one of the preceding claims, characterized in that a recess of the base body

(11) is provided in the air inlet area (12).

8. compressor housing according to claim 7, characterized in that in the air inlet region (12) provided recess of the base body (11) in the radial direction (23).

9. compressor housing according to claim 7, characterized in that in the air inlet region (12) provided at the recess of the contour region (13) distal end of the air inlet portion (12) is provided and in the radial direction (23) and axial direction (22).

10. Compressor housing according to one of the preceding Ansprü ^¬ che, characterized in that a recess of the base ^¬ body (11) in the diffuser region (14) is provided.

11. compressor housing according to claim 10, characterized in that in the diffuser region (14) provided from ^¬ savings in the axial direction (22).

12. Compressor housing according to one of the preceding claims, characterized in that a recess of the base ^¬ body (11) in the transition region between the diffuser region (14) and the spiral channel region (15) is provided.

13. Compressor housing according to claim 12, characterized marked, that in the transition region between the

Diffuser region (14) and the spiral channel region (15) provided recess in the axial direction (22).

14. Compressor housing according to any preceding Ansprü- surface, characterized in that the base body (11) and the plastic component (17) have different thermal expansion coefficients ^¬ or have the same thermal expansion coefficient.

15. Compressor housing according to one of the preceding Ansprü ^¬ che, characterized in that the base body (11) consists of a metal or plastic.