Rotor for a turbocharger

Abstract

There is disclosed a rotor for a turbocharger, wherein the rotor has a rotor shaft, a carrier sleeve, a bearing collar and an oil diverting ring. The oil diverting ring is arranged on the carrier sleeve and is spaced apart from the rotor shaft in the radial direction by means of the carrier sleeve.

Claims

1. A rotor for a turbocharger, the rotor comprising: a rotor shaft; a carrier sleeve; a sealing bushing, the sealing bushing arranged on the carrier sleeve; an oil diverting ring; a bearing collar; and wherein the oil diverting ring, as a separate component, is arranged adjacent to the sealing bushing in an axial direction on the carrier sleeve and is spaced apart from the rotor shaft in a radial direction thereof; wherein the bearing collar, as a separate component, is arranged on the carrier sleeve spaced apart from the oil diverting ring such that an axial bearing is located in between the bearing collar and the oil diverting ring.

2. The rotor of claim 1, wherein the carrier sleeve is formed as part of the sealing bushing and the oil diverting ring is arranged on the carrier sleeve of the sealing bushing.

3. The rotor of claim 2, wherein the oil diverting ring is pressed, soldered, welded, adhesively bonded, riveted or screwed to the sealing bushing.

4. The rotor of claim 3, wherein the sealing bushing provides a step on the carrier sleeve, onto which the oil diverting ring is fitted.

5. The rotor of claim 4, wherein the bearing collar is also arranged on the step provided by the sealing bushing.

6. The rotor of claim 4, wherein the bearing collar is arranged on the same step of the carrier sleeve as the oil diverting ring or is arranged on a further step of the carrier sleeve.

7. The rotor of claim 5, wherein the bearing collar comprises an annular disk.

8. The rotor of claim 1, further comprising shaft sealing rings arranged on the carrier sleeve, forming the sealing bushing.

9. The rotor of claim 8, wherein the oil diverting ring is in contact with one of the shaft sealing rings.

10. The rotor of claim 1, wherein the oil diverting ring has a surface which is embossed, coated, or hardened.

11. The rotor of claim 1, wherein the bearing collar has a surface which is embossed, coated, or hardened.

12. The rotor of claim 1, wherein the carrier sleeve is produced using a forming process and an additional grinding process.

13. The rotor of claim 1, wherein the carrier sleeve has at least a partially conical outer contour.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Example embodiments for the invention will be explained in more detail below with reference to FIGS. 4 to 13. In the figures:

(2) FIG. 1 shows a sectional illustration of a known rotor of a turbocharger,

(3) FIG. 2 shows a sectional illustration of another known rotor of a turbocharger,

(4) FIG. 3 shows a sectional illustration of yet another known rotor of a turbocharger,

(5) FIG. 4 shows a sectional illustration for explaining a first example embodiment of the invention,

(6) FIG. 5 shows a perspective illustration of a sealing bushing,

(7) FIG. 6 shows an illustration of a sealing bushing with an oil diverting ring pressed thereon,

(8) FIG. 7 shows a further illustration of a sealing bushing with an oil diverting ring pressed thereon,

(9) FIG. 8 shows a sectional illustration for explaining a second example embodiment of the invention,

(10) FIG. 9 shows a sectional illustration for explaining a third example embodiment of the invention,

(11) FIG. 10 shows a sectional illustration for explaining a fourth example embodiment of the invention,

(12) FIG. 11 shows a sectional illustration for explaining a fifth example embodiment of the invention,

(13) FIG. 12 shows a sectional illustration for explaining a sixth example embodiment of the invention, and

(14) FIG. 13 shows a further illustration of the example embodiment shown in FIG. 12.

DETAILED DESCRIPTION

(15) In the embodiments of the present invention, a rotor for a turbocharger has a rotor shaft, a carrier sleeve, an oil diverting ring and a bearing collar, wherein the oil diverting ring is arranged on the carrier sleeve and is spaced apart from the rotor shaft in the radial direction.

(16) FIG. 4 shows a sectional illustration for explaining a first example embodiment.

(17) The rotor shown in FIG. 4 has a rotor shaft 10. The latter is guided through a bearing housing 13, which has a lubricating oil supply 14, a radial bearing 15a and an axial bearing 15b, and continues into a compressor housing. A compressor wheel 11 is fastened on the rotor shaft 10. In the transition region between the bearing housing 13 and the rear wall 12, the rotor shaft has a step 16 which serves as an axial stop.

(18) Furthermore, a bearing collar 5 which is configured as an annular disk is provided on the rotor shaft 10 in the direction of the rear wall 12. A carrier sleeve which is realized as a sealing bushing 7 is arranged adjacent to the bearing collar 5 in the direction of the rear wall 12. An oil diverting ring 7a is arranged on the sealing bushing 7, into which sealing rings are inserted, the oil diverting ring being pressed onto a step of the sealing bushing 7. The oil diverting ring 7a is spaced apart from the rotor shaft 10 by the sealing bushing and consequently is not in direct contact with the rotor shaft 10. The number of components which are directly contacted by the rotor shaft is thereby reduced. The advantage of this reduction in the number of intersections is that, during the installation of the rotor, when the shaft nut is tightened, the bending of the rotor shaft is reduced and in that movements of the components of the rotor assembly relative to one another and relative to the rotor shaft during operation of the turbocharger are reduced.

(19) FIG. 5 shows a perspective illustration of the sealing bushing 7 illustrated in FIG. 4. The sealing bushing has annularly formed widened portions which extend radially outward and form receptacles for one or more annular sealing elements, for example piston rings. A receiving step for the oil diverting ring 7a is provided adjacent to the sealing element receptacles in the axial direction. The outside diameter of the sealing bushing is constant in the region of the receiving step. A bearing-housing-side end region of the sealing bushing, in which end region the outside diameter of the sealing bushing is continuously reduced, adjoins the receiving step for the oil diverting ring. This facilitates the installation. This diameter may also be constant.

(20) FIG. 6 shows an illustration of the sealing bushing 7 with the oil diverting ring 7a pressed thereon and with the bearing collar 5 which is adjacent to the sealing bushing 7 in the axial direction.

(21) FIG. 7 shows a further illustration of the sealing bushing 7 with the oil diverting ring 7a pressed thereon and with the bearing collar 5 which is adjacent to the sealing bushing in the axial direction. The arrow P1 illustrates a force flux cone, the arrow P2 a reduction in the contact surface in order to minimize angle errors, the arrow P3 a loose fit, the arrow P4 an interference fit and the arrow P5 a reduction in the contact surface in order to minimize angle errors.

(22) FIG. 8 shows a sectional illustration for explaining a second example embodiment.

(23) In this second example embodiment, as in the first example embodiment, the carrier sleeve is realized as a sealing bushing 7 which has one or more receiving regions or receiving grooves for receiving one piston ring each. Furthermore, in this example embodiment too, an oil diverting ring 7a is arranged on the sealing bushing 7, is pressed onto the sealing bushing, and is spaced apart from the rotor shaft by means of the sealing bushing. Furthermore, in this second example embodiment, the bearing collar 5 is also arranged on the sealing bushing 7 and is therefore spaced apart from the rotor shaft by means of the sealing bushing. In this second example embodiment, the oil diverting ring 7a and the bearing collar 5 are positioned on the same receiving step of the sealing bushing 7. The outside diameter of the sealing bushing is approximately constant throughout the region of the receiving step. A cone over the entire length or over part of the receiving step is also conceivable here.

(24) FIG. 9 shows a sectional illustration of a third example embodiment. This third example embodiment differs from the second example embodiment shown in FIG. 8 only in that the sealing bushing 7 has a second receiving step on which the bearing collar 5 is positioned.

(25) FIG. 10 shows a sectional illustration of a fourth example embodiment. This differs from the example embodiments described above in that the sealing bushing 1 does not form the carrier sleeve, but rather is arranged on the carrier sleeve 8 and is therefore spaced apart from the rotor shaft by means of the carrier sleeve. The sealing bushing 1 has receiving grooves in a conventional manner for sealing rings. An oil diverting ring 7a is positioned on the carrier sleeve 8 adjacent to the sealing bushing 1. In the example embodiment shown, the oil diverting ring makes contact directly with the sealing bushing 1. Furthermore, a bearing collar 5 is arranged on the carrier sleeve 8. The bearing collar is also consequently spaced apart from the rotor shaft by means of the carrier sleeve 8. In this example embodiment, only the carrier sleeve 8 is consequently in direct contact with the rotor shaft.

(26) FIG. 11 shows a sectional illustration of a fifth example embodiment. This example embodiment differs from the example embodiment shown in FIG. 10 in that, instead of a sealing bushing, a total of two or more run-on disks 9 for shaft sealing rings are positioned on the carrier sleeve 8. Furthermore, an oil diverting ring 7a is positioned on the carrier sleeve 8 adjacent to the run-on disk 9 which is on the right in FIG. 11. In the example embodiment shown, the oil diverting ring makes contact directly with the right-hand run-on disk 9. Furthermore, a bearing collar 5 is arranged on the carrier sleeve 8. The bearing collar is also consequently spaced apart from the rotor shaft by means of the carrier sleeve 8. In this example embodiment too, only the carrier sleeve 8 is consequently in direct contact with the rotor shaft.

(27) FIG. 12 shows a sectional illustration of a sixth example embodiment.

(28) The rotor shown in FIG. 12 has a rotor shaft 10. The latter is guided through a bearing housing 13, which has a lubricating oil supply 14, a radial bearing 15a and an axial bearing 15b, and continues into a compressor housing. A compressor wheel 11 is fastened on the rotor shaft 10. In the transition region between the bearing housing 13 and the rear wall 12, the rotor shaft has a step 16 which serves as an axial stop.

(29) Furthermore, a bearing collar 5 which is configured as an annular disk is provided on the rotor shaft 10 in the direction of the compressor housing 12. A carrier sleeve 8 is arranged adjacent to the bearing collar 5 in the direction of the compressor housing. A sealing bushing 1 into which sealing rings are inserted is arranged on the carrier sleeve 8. The sealing bushing 1 is consequently spaced apart from the rotor shaft by means of the carrier sleeve 8. Furthermore, an oil diverting ring 7a is arranged on the carrier sleeve 8 adjacent to the sealing bushing 1. The oil diverting ring is positioned on a step of the carrier sleeve 8. The oil diverting ring 7a is spaced apart from the rotor shaft 10 by the carrier sleeve 8 and consequently is not in direct contact with the rotor shaft 10. The number of components which are directly contacted by the rotor shaft is thereby reduced to two. The advantage of this reduction in the number of intersections in this example embodiment too is that, during the installation of the rotor, when the shaft nut is tightened, the bending of the rotor shaft is reduced and in that movements of the components of the rotor assembly relative to one another during operation of the turbocharger are reduced.

(30) FIG. 13 shows a further illustration of the example embodiment which is shown in FIG. 12 and in which the carrier sleeve 8, the sealing bushing 1, the oil diverting ring 7a and the bearing collar 5 which is positioned next to the carrier sleeve 8 are illustrated in enlarged form.

(31) In all of the example embodiments described above, the number of components directly contacted by the rotor shaft is kept small. A carrier sleeve which is directly contacted by the rotor shaft is in each case provided. The carrier sleeve may be a sealing bushing on which an oil diverting ring is positioned. Furthermore, a bearing collar is either likewise positioned on the sealing bushing or is arranged next to the latter. Alternatively thereto, the sealing bushing may also be arranged on the carrier sleeve. In this alternative, the oil diverting ring is likewise arranged on the carrier sleeve. Furthermore, in this alternative too, the bearing collar is either likewise arranged on the carrier sleeve or is positioned next to the latter in the axial direction.

(32) In all of the above-described example embodiments, the oil diverting ring 7a may have a surface which is embossed, coated, hardened or changed in its microstructure.

(33) Furthermore, the bearing collar may also have a surface which is embossed, coated, hardened or changed in its microstructure.

(34) Furthermore, the carrier sleeve may be produced by forming and by an additional grinding process.