Rotor of a supercharging device

Abstract

A rotor for a supercharging device may include a compressor wheel and a turbine wheel. A sealing disc may be arranged between the compressor wheel and the turbine wheel. The sealing disc may include a first side interfacing with the compressor wheel and a second side interfacing with the turbine wheel. The compressor wheel and the turbine wheel may each define one of a holding contour and a counter-holding contour, which respectively interact with a corresponding one of a holding contour and a counter-holding contour defined on each of the first side and the second side of the sealing disc. The respective holding contour may correspond to the respective counter-holding contour, which may engage in one another and secure the compressor wheel, the sealing disc and the turbine wheel to one another.

Claims

1. A rotor of a supercharging device, comprising: a compressor wheel and a turbine wheel arranged coaxially with the compressor wheel with respect to a rotation axis; a sealing disc arranged axially between the compressor wheel and the turbine wheel, the sealing disc including a first axial side interfacing with the compressor wheel and a second axial side interfacing with the turbine wheel, wherein the sealing disc encloses a hollow space and defines a radial extent greater than an axial extent to facilitate sealing; wherein the sealing disc is coupled on the first axial side to the compressor wheel and on the second axial side to the turbine wheel at respective connections, the respective connections each including a holding contour engaged with a counter-holding contour, wherein the holding contour is a central recess and the counter-holding contour is a centrally projecting extension; and wherein the respective connections are disposed in the hollow space axially between the compressor wheel and the turbine wheel and secure the compressor wheel, the sealing disc and the turbine wheel to one another.

2. The rotor according to claim 1, wherein the central recess and the centrally projecting extension extend axially to the rotation axis.

3. The rotor according to claim 1, wherein: the compressor wheel and the turbine wheel each include the central recess, which respectively face one another, the sealing disc includes centrally projecting extensions on the first side and on the second side, respectively, the centrally projecting extensions on the first side and the second side of the sealing disc respectively engaging the corresponding central recess of the compressor wheel and the turbine wheel to secure the compressor wheel, the sealing disc and the turbine wheel to one another.

4. The rotor according to claim 1, wherein: the compressor wheel and the turbine wheel each include the centrally projecting extension, which project in a direction towards one another, the sealing disc includes central recesses on the first side and the second side, respectively, wherein the central recesses on the first side and the second side of the sealing disc respectively receive the corresponding centrally projecting extension of the compressor wheel and the turbine wheel to secure the compressor wheel, the sealing disc and the turbine wheel to one another.

5. The rotor according to claim 1, wherein: the first side and the second side of the sealing disc respectively include one of the centrally projecting extension and the central recess, the compressor wheel includes another of the centrally projecting extension and the central recess corresponding to the first side of the sealing disc, and the turbine wheel includes another of the centrally projecting extension and the central recess corresponding to the second side of the sealing disc to secure the compressor wheel, the sealing disc and the turbine wheel to one another.

6. The rotor according to claim 1, wherein the sealing disc further includes a plurality of annular sealing fins disposed on a radially outer side with respect to the hollow space to provide a labyrinth seal.

7. The rotor according to claim 1, wherein the centrally projecting extension of the respective connections has an external thread and the central recess associated therewith has a complementary internal thread, so that the compressor wheel is configured to be screwed to the turbine wheel via the sealing disc.

8. The rotor according to claim 1, wherein the centrally projecting extension of the respective connections defines at least one of a crowned head and a ball joint head, which engage in the central recess associated therewith having a profile complementary thereto.

9. The rotor according to claim 1, wherein the centrally projecting extension of the respective connections is pressed into the central recess associated therewith.

10. The rotor according to claim 1, wherein the sealing disc is annularly and sealingly connected to the turbine wheel and the compressor wheel.

11. The rotor according to claim 1, wherein the sealing disc further includes at least two annular steps disposed axially opposite one another on the first side and the second side, respectively, wherein the compressor wheel engages at least one annular step on the first side via a first annular edge, and the turbine wheel engages another annular step on the second side via a second annular edge.

12. A supercharging device, comprising: a rotor including a compressor wheel having a first face end, a turbine wheel having a second face end and a sealing disc arranged axially between the compressor wheel and the turbine wheel with respect to a rotation axis, the sealing disc enclosing a hollow space and having a first axial side interacting with the first face end of the compressor wheel and a second axial side interacting with the second face end of the turbine wheel; the first face end of the compressor wheel having one of a first holding contour and a first counter-holding contour and the first axial side of the sealing disc having another of the first holding contour and the first counter-holding contour; the second face end of the turbine wheel having one of a second holding contour and a second counter-holding counter and the second axial side of the sealing disc having another of the second holding contour and the second counter-holding contour; wherein the first holding contour and the second holding contour each define a recess, and the first counter-holding contour and the second contour-holding contour each define an axially projecting extension; wherein the compressor wheel is fastened to the turbine wheel via a first interlocking connection disposed in the hollow space between the first holding contour and the first counter-holding contour, and a second interlocking connection disposed in the hollow space between the second holding contour and the second counter-holding contour; and wherein the sealing disc defines a radial extent greater than an axial extent to facilitate sealing a fluid flow in an axial direction of the rotation axis.

13. The supercharging device according to claim 12, wherein the first interlocking connection and the second interlocking connection are disposed centrally in the hollow space.

14. The supercharging device according to claim 12, wherein the first face end of the compressor wheel and the second face end of the turbine wheel respectively include the recess, the recess of the first face end arranged to face towards the recess of the second face end; and the sealing disc includes the axially projecting extension on the first axial side engaged with the recess of the first face end and on the second axial side engaged with the recess of the second face end to secure the compressor wheel, the sealing disc and the turbine wheel to one another.

15. The supercharging device according to claim 12, wherein the first face end of the compressor wheel and the second face end of the turbine wheel respectively include the axially projecting extension, which project towards one another; and the sealing disc includes the recess on the first axial side engaged with the axially projecting extension of the first face end and on the second axial side engaged with the axially projecting extension of the second face end to secure the compressor wheel, the sealing disc and the turbine wheel to one another.

16. The supercharging device according to claim 12, wherein one of the first face end of the compressor wheel and the second face end of the turbine wheel includes the recess, and another of the first face end and the second face end includes the axially projecting extension; and wherein the first axial side of the sealing disc includes a corresponding one of the recess and the axially projecting extension interacting with the first face end, and the second axial side includes a corresponding one of the recess and the axially projecting extension interacting with the second face end.

17. The supercharging device according to claim 12, wherein the sealing disc further includes a plurality of annular sealing fins, which define a labyrinth seal.

18. The supercharging device according to claim 12, wherein the sealing disc is annularly and sealingly connected to the turbine wheel and the compressor wheel.

19. The supercharging device according to claim 18, wherein the sealing disc further includes at least two annular steps disposed axially opposite one another with respect to an axis of rotation; wherein the first side of the compressor wheel engages one of the at least two annular steps via a first annular edge and the second side of the turbine wheel engages another of the at least two annular steps via a second annular edge.

20. A rotor for a supercharging device, comprising: a compressor wheel having a first face end, the first face end defining a central recess; a turbine wheel having a second face end facing towards the first face end of the compressor wheel, the second face end defining a central recess; a sealing disc disposed axially between the compressor wheel and the turbine wheel with respect to an axis of rotation, the sealing disc enclosing a hollow space and including a first axially projecting extension engaging into the central recess of the first face end and a second axially projecting extension engaging into the central recess of the second face end; wherein the compressor wheel and the turbine wheel are fastened to one another at a first interlocking connection disposed in the hollow space between the first axially projecting extension of the sealing disc and the central recess of the first face end of the compressor wheel, and at a second interlocking connection disposed in the hollow space between the second axially projecting extension of the sealing disc and the central recess of the second face end of the turbine wheel; and wherein the sealing disc defines a radial extent greater than an axial extent to facilitate sealing a fluid flow in an axial direction of the rotation axis.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Here it shows, in each case schematically,

(2) FIG. 1 a sectional representation through a rotor according to the invention,

(3) FIG. 2 a representation as in FIG. 1, however with another type of connection between sealing disc and compressor wheel respectively turbine wheel,

(4) FIG. 3 a detail representation from FIG. 2 in the region of the connection of the sealing disc to the compressor wheel respectively turbine wheel,

(5) FIG. 4 a representation as in FIG. 1, however with extensions and recesses arranged conversely,

(6) FIG. 5 a representation as in FIG. 4, however with extension and recess conversely on the compressor side,

(7) FIG. 6 a representation as in FIG. 4, however with extension and recess conversely on the turbine side.

DETAILED DESCRIPTION

(8) According to the FIGS. 1 to 4, a rotor 1 according to the invention of a supercharging device 2 which is merely shown in outline, which in particular can be designed as an exhaust gas turbocharger, comprises a compressor wheel 3 and a turbine wheel 4 connected thereto. The compressor wheel 3 and the turbine wheel 4 each have a holding contour 13 and the sealing disc 5 a counter-holding contour 14 formed complementarily thereto, or vice versa (see FIG. 4). With the embodiments shown in FIGS. 5 and 6, the sealing disc 5 comprises a central counter-holding contour 14 and located opposite a central holding contour 13 and the compressor wheel 3 and the turbine wheel 4 each comprise a holding contour 13 or a counter-holding contour 14 each formed complementarily thereto. All shown embodiments in this case have in common that the holding contour 13 and the counter-holding contour 14 engage in one another in the assembled state and in addition fasten the compressor wheel 3, the sealing disc 5 and the turbine wheel 4 to one another.

(9) Independently of the selected embodiment, the holding contour 13 is designed as a central recess 7, 7, 7, 7, whereas the counter-holding contour 14 is designed as a centrally projecting extension 6, 6, 6, 6.

(10) According to FIGS. 1 to 3, a sealing disc 5 is arranged between the compressor wheel 3 and the turbine wheel 4, which comprises two centrally projecting extensions 6, 6 located axially opposite as counter-holding contour 14. The compressor wheel 3 and the turbine wheel 4 by contrast each have a central recess 7, 7 facing one another as holding contour 13, wherein the sealing disc 5 with its extensions 6, 6 engages in the central recess 7, 7 of the compressor wheel 3 and of the turbine wheel 4 and thereby fastens these to one another. FIG. 4 shows a converse, alternative embodiment, with which the compressor wheel 3 and the turbine wheel 4 each comprise central extensions 6, 6 facing one another as counter-holding contour 14. Between the compressor wheel 3 and the turbine wheel 4 a sealing disc 5 is again arranged which now however comprises two central recesses 7, 7 located axially opposite and designed as holding contour 13. The compressor wheel 3 and the turbine wheel 4 engage with their central extensions 6, 6 in the central recesses 7, 7 of the sealing disc 5. Thus, FIG. 4 is an inverted embodiment with respect to FIGS. 1 and 2 only with respect to the extensions 6, 6 and the recesses 7, 7. This embodiment offers the major advantage that the extension 6 is heated on the turbine wheel 4 during the operation of the exhaust gas turbocharger and because of this expands, which leads to a pressing in and additional fixing in the recess 7 of the sealing disc 5.

(11) Looking at the embodiment of FIG. 5, it is evident that the sealing disc 5 comprises a central extension 6 on the turbine side and a central recess 7 on the compressor side and the compressor wheel 3 has an extension 6 designed complementarily thereto and the turbine wheel 4 has a recess 7 designed complementarily thereto and in addition are fastened to one another.

(12) Looking at the embodiment of FIG. 6 the same is constructed conversely to FIG. 5, so that the sealing disc 5 has a central extension 6 on the compressor side and a central recess 7 on the turbine side and the compressor wheel 3 has a recess 7 designed complementarily thereto and the turbine wheel 4 has an extension 6 designed complementarily thereto and are thereby fastened to one another. This alternative is particularly favourable since on the turbine wheel 4 an extension 6 and on the sealing disc 5 an associated recess 7 and on the compressor wheel 3 a recess 7 and located opposite on the sealing disc an associated extension 6 are formed, so that the extension 6 on the turbine wheel 4 during the operation of the exhaust gas turbocharger heats up and because of this expands, which leads to a pressing in and additional fixing in the recess 7 of the sealing disc 5 and simultaneously transfers the heat to the sealing disc 5 and the extension 6 of the same facing the compressor wheel 3, so that said extension can expand and brace itself in the recess 7 on the compressor wheel 3.

(13) Here, the extensions 6, 6, 6, 6 can comprise an external thread 15 and the associated recess 7, 7, 7, 7 an internal thread 16 designed complementarily thereto, so that the compressor wheel 3 can be screwed to the turbine wheel 4 via the sealing disc 5, as is shown according to FIG. 1. Analogously, this obviously applies also to the converse embodiment according to FIG. 4. Alternatively thereto, the extensions 6, 6, 6, 6 can also be formed crowned or comprise a ball joint head 8, 8, as is shown according to FIGS. 2 and 3 and engage in the associated recesses 7, 7, 7, 7 designed complementarily thereto. In this case, the recesses 7, 7 are formed in the manner of a joint socket.

(14) Again alternatively, the extensions 6, 6, 6, 6 can also be formed with oversize to the associated recesses 7, 7, 7, 7 and are pressed into these. Here it is also conceivable purely theoretically that the extensions 6, 6, 6, 6 and the associated recesses 7, 7, 7, 7 do not have a rotation-symmetrical outer contour respectively inner contour but purely theoretically an angular outer contour or an angular contour that is formed complementarily thereto, as a result of which a torque transmission is possible in a particularly simple manner and in particular via a positively joined connection. Obviously it is also conceivable that the extension 6, 6 has an external thread and the recess 7, 7 an associated complementary internal thread, whereas the extension 6, 6 has a ball joint head 8, as a result of which a combination of the connections from FIGS. 1 and 2 respectively from FIGS. 2 and 4 is possible.

(15) Looking further at the FIGS. 1, 2 and 4 to 6, it is evident that the sealing disc 5 has annular sealing fins 9 which form a labyrinth seal. This is to prevent in particular a transfer of hot exhaust gas from the turbine wheel 4 in the direction of the compressor wheel 3. It is evident furthermore in the FIGS. 1 and 2 that the sealing disc 5 is connected in an annularly sealing manner to the turbine wheel 4 on the one side and the compressor wheel 3 on the other side. To this end, the sealing disc 5 has two annular steps 10 and 10 located opposite, wherein in one thereof the compressor wheel 3 engages with an annular edge 11, whereas the turbine wheel 4 with an annular edge 11 engages in the other annular step 10.

(16) On the whole, a connection of a turbine wheel 4 to a compressor wheel 3 can be achieved with the rotor 1 according to the invention even with a comparatively thick shaft 12, in particular provided a mounting of the shaft 12 on the end side is selected.