RECEPTACLE DEVICE FOR THE ROTOR ASSEMBLY OF A TURBOCHARGER
A turbocharger has a turbocharger housing with at least one section that is divided in the longitudinal direction into at least two housing halves. A receiving device for receiving a rotor assembly of the turbocharger can be fastened to at least one half of the housing.
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The invention relates to a receptacle device for the rotor assembly of a turbocharger, wherein the rotor assembly comprises a shaft, a bearing arrangement and at least one rotor wheel, and wherein the housing of the turbocharger is designed so as to be divided in the longitudinal direction into at least two housing halves.
In general, a turbocharger comprises an exhaust gas turbine in an exhaust gas mass flow, which is connected by a shaft to a compressor in the intake section. The turbine wheel of the turbine is arranged in a turbine housing, and the compressor wheel of the compressor is arranged in a compressor housing. The shaft, in turn, is supported in a bearing housing. During operation, the turbine wheel is driven by the exhaust gas mass flow and, in turn, drives the compressor wheel. The compressor compresses the induced air and feeds it to the internal combustion engine. Normally, the shaft is supported in the bearing housing by means of a radial bearing arrangement. Owing to fluid flows acting on the turbine wheel and the compressor wheel, powerful axial forces can occur. The radial bearings are generally not suitable for absorbing such axial forces. The usual practice is therefore to provide at least one or two additional axial bearings in order to absorb these axial forces in an appropriate manner.
The existing design of turbochargers furthermore provides for individual housings which are fastened one behind the other and sealed off relative to one another. A new form of turbocharger housing now envisages dividing the turbocharger housing in the longitudinal direction, not transversely to the longitudinal axis thereof as hitherto.
This new turbocharger housing is the subject matter of a separate patent application.
Thus, it is the object of the present invention to provide an improved receptacle device for a rotor assembly of a turbocharger, wherein the turbocharger has a turbocharger housing divided in the longitudinal direction into at least two housing halves.
This object is achieved by a turbocharger having a receptacle device with the features of patent claim 1.
Accordingly, the invention provides a turbocharger having a turbocharger housing, wherein at least one section of the turbocharger housing is designed so as to be divided in the longitudinal direction into at least two housing halves, wherein a receptacle device for receiving a rotor assembly of the turbocharger is provided.
The turbocharger has the advantage that the receptacle device can be fully preassembled with the rotor assembly, i.e. the shaft and the bearing assembly thereof plus the rotor wheels, and then inserted into the housing halves. The receptacle device, together with the rotor assembly in addition, can then be fastened to one or both housing halves. In the case of the existing turbocharger housings, which were of closed design, the rotor assembly had to be, as it were, slipped on, there being no possibility of preassembly.
Advantageous embodiments and developments of the invention will emerge from the dependent claims and from the description with reference to the drawings.
The invention is explained in greater detail below with reference to the embodiments indicated in the schematic figures of the drawings, in which:
In all the figures, elements and apparatus which are the same or have the same function have been provided with the same reference signs, unless otherwise indicated. Moreover, the depiction of the turbocharger in the following figures is shown in a purely schematic way, which is not to scale and is greatly simplified.
For assembly, an appropriate design of turbocharger housing is one in which at least one section of the turbocharger housing is designed so as to be divided in the longitudinal direction into at least two housing halves, thus enabling the rotor assembly to be inserted radially. Hitherto, the rotor assembly was installed axially in a bearing housing, and the components of the rotor were, as it were, slipped on. In this case, the housing is normally of closed design.
According to the invention, the rotor assembly of a turbocharger and the bearing assembly thereof is received in a turbocharger housing divided in the longitudinal direction into at least two housing halves, as shown by way of example in following
Moreover, a seat is formed for a respective sealing device in such a way that it has a certain concentricity so as to be leaktight and maintains a certain predetermined play.
In the present example, the turbocharger housing 12 is, as an option, additionally embodied in such a way that it can be at least partially temperature-controlled or cooled and/or heated. To be more precise, the region of the turbocharger housing 12 in the example shown in
The housing halves 14, 16 shown in
In
A first embodiment according to the invention, as shown in
Moreover, it is possible, as an option, for an axial bearing arrangement or at least one axial bearing to be additionally fastened to the inserted sleeve 36, as shown by way of example in following
In the example shown in
As shown in
As shown in
The shaft 30 forms an offset with a stop for the radial bearing arrangement 38, for example. As an option, an axial bearing arrangement 48 is additionally provided at the other end of the inserted sleeve 36, having at least one axial bearing 50, wherein the axial bearing 50 is designed as an axial bearing washer, for example, and can be additionally fastened to the inserted sleeve 36, depending on function and application, as shown by way of example and in a purely schematic way in following
As an option, the axial bearing 50 can additionally be bounded on one side by a bush element 52, for example. The bush element 52 can additionally have at least one sealing device 54 on the outside thereof for the purpose of sealing the bearing housing section 18, for example, with respect to the rotor wheel housing section 22. Two piston ring seals in corresponding grooves on the outside of the bush element 52 can be provided as a sealing device 54, for example. As described above, it is possible, according to the first embodiment according to the invention, for the inserted sleeve 36 to be preinstalled directly on the shaft 30 and then to be inserted with the rotor assembly into the respective housing half 14, 16 of the turbocharger housing 12.
Here, a radial bearing arrangement 38 is received in the inserted sleeve 36 in order to provide support for the shaft 30 in the radial direction. The radial bearing arrangement 38 likewise has two radial plain bearings 40, for example, wherein the inserted sleeve 36 is simultaneously designed as a spacer sleeve for the purpose of positioning the two bearings. An additional lubricant feed 44 leading to one or both radial plain bearings 40 can furthermore be provided in the inserted sleeve 36, said lubricant feed being connected to a corresponding lubricant feed 46 of the turbocharger housing 12 and/or one housing half 14. As an option, an axial bearing arrangement 48 can also additionally be provided as well as the radial bearing arrangement 38, said axial bearing arrangement having at least one axial bearing 50 for example, e.g. in the form of an axial bearing washer. The axial bearing 50 in
The inserted sleeve 36 has the advantage that it can be inserted into the housing halves 14, 16 of the turbocharger housing 12 or, for example, into a cylinder head or into an engine block (not shown), together with the fully assembled rotor assembly, in which case a screwing operation can be omitted. In addition, damping of the oil or lubricant surrounding the sleeve is obtained.
This shows a bearing bracket 60 which has in each case at least one lug 62 or projection on one or both sides for fastening to the turbocharger housing 12. The bearing bracket 60 is fastened to one housing half 14 of the longitudinally divided turbocharger housing 12, e.g. by means of screwing and/or pinning. In the example in
After the insertion of the shaft 30 with the two rotor wheels 32, 34 and the radial bearing arrangement 38 and/or axial bearing arrangement 48 into a housing half 14 of the turbocharger 10 for example, the respective bearing bracket 60 is attached to said housing half 14 in order to fasten the rotor assembly additionally thereon.
The bearing bracket 60 and, with the latter, the rotor assembly is fastened to the housing half 14 by means of screwing or pinning, for example, as described above. By providing the bearing bracket 60, preferably together with the turbocharger housing 12 or the associated housing half 14, with a pinned or screwed joint or machining it in an appropriate manner, a bearing receptacle for the respective bearing arrangement is obtained which has a high truth of running and accuracy of position, even after reassembly. Another advantage of this embodiment is that there are no interruptions in the bearing surfaces due to a seal, which would otherwise disrupt the sliding film of a plain bearing arrangement, for example. This also enables the lubricant discharge to be configured in an optimum manner.
As shown in
In the example shown in
This embodiment according to the invention has the advantage that the machining for the respective bearing receptacle has to be carried out in only one component, in this case the bearing core 66, since there is no division of the bearing location in this case. This furthermore has the advantage that no offset can arise. Another advantage of the bearing core 66 is that high truth of running can be achieved. Moreover, machining of the bearing location independently of the housing halves 14 in the case of the solution involving the bearing core 66 is advantageous.
The invention as described above by way of example with reference to
The above-described embodiments relating to the installation of the rotor assembly in a turbocharger housing have the advantage that it is possible to machine the housing halves, the cylinder head halves or the engine block independently of one another. Moreover, as an option, it is possible additionally to provide or additionally to fasten an axial bearing on or to the bearing bracket, the bearing core and the inserted sleeve, making it possible to implement the feeding of lubricant and the bearing tolerances in an optimum manner and to better define the positions thereof relative to one another.
The invention is not restricted to the embodiments described above. In particular, the embodiments described above can be combined, especially individual features of the various embodiments.
The depiction of the turbocharger in
Claims
1-10. (canceled)
11. A turbocharger. comprising:
- a turbocharger housing, said turbocharger housing having at least one section divided in a longitudinal direction to form at least two housing halves;
- a receptacle device for receiving a rotor assembly of the turbocharger, said receptacle device being configured for fastening to at least one of said at least two housing halves.
12. The turbocharger according to claim 11, wherein said receptacle device includes at least one inserted sleeve configured to receive at least a shaft of the rotor assembly and at least one bearing of a bearing assembly.
13. The turbocharger according to claim 12, wherein said inserted sleeve is configured to receive a radial bearing assembly.
14. The turbocharger according to claim 13, wherein said inserted sleeve includes at least one lubricant feed for one or both bearings of said radial bearing assembly.
15. The turbocharger according to claim 14, wherein said turbocharger housing is formed with a lubricant feed and said lubricant feed of said inserted sleeve is connectible to said lubricant fee of said turbocharger housing.
16. The turbocharger according to claim 12, wherein said inserted sleeve has a collar section at one end or at both ends, and wherein at least one said collar section is elastically flexible.
17. The turbocharger according to claim 12, wherein said inserted sleeve has a collar section at one end or at both ends, and wherein at least one said collar section is rigid.
18. The turbocharger according to claim 12, wherein said inserted sleeve is fastenable in said housing halves.
19. The turbocharger according to claim 18, wherein said inserted sleeve is fastened in said housing halves by screwing and/or pinning.
20. The turbocharger according to claim 11, wherein said receptacle device includes at least one bearing bracket for receiving at least the shaft and at least one bearing of a bearing assembly.
21. The turbocharger according to claim 20, wherein said bearing assembly is a radial bearing assembly.
22. The turbocharger according to claim 20, wherein said bearing bracket has at least one lug or projection on one or both sides thereof for fastening said bearing bracket to a housing half of said turbocharger housing.
23. The turbocharger according to claim 22, wherein said bearing bracket is connected to said housing half of said turbocharger housing by screwing and/or pinning.
24. The turbocharger according to claim 11, wherein said receptacle device includes at least one bearing core or bearing block for receiving at least the shaft and at least one bearing of a bearing assembly.
25. The turbocharger according to claim 11, wherein the bearing assembly to be received by said at least one bearing core or bearing block is a radial bearing assembly.
26. The turbocharger according to claim 25, wherein said bearing core has at least one lug or projection on one or both sides thereof for fastening said bearing core to a housing half of said turbocharger housing.
27. The turbocharger according to claim 26, wherein said bearing core is attached to the housing half of said turbocharger housing by screwing and/or pinning.
28. The turbocharger according to claim 11, wherein said receptacle device is configured for attaching at least one axial bearing of an axial bearing assembly.
29. The turbocharger according to claim 28, wherein said at least one axial bearing of said axial bearing assembly is fastened to an inserted sleeve, a bearing block, a bearing core, and/or at least one of said housing halves of said turbocharger housing.
30. The turbocharger according to claim 29, wherein said at least one axial bearing is attached by screwing and/or pinning.
Type: Application
Filed: Nov 4, 2010
Publication Date: Nov 8, 2012
Applicant: CONTINENTAL AUTOMOTIVE GMBH (HANNOVER)
Inventors: Ralf Boening (Reiffelbach), Holger Faeth (Fussgoenheim), Ralph Maurice Koempel (Mannheim)
Application Number: 13/509,637
International Classification: F01D 25/24 (20060101); F01D 25/18 (20060101);