ROTOR DISK HAVING SERRATIONS AND ROTOR

Abstract

A rotor disk of a rotor, in particular of a gas turbine, which has serrations, at least on one side, for torque transmission, having a plurality of teeth distributed over the circumference, the tooth flanks of which are aligned opposite with respect to a respective central plane, wherein the tooth flanks have a course that deviates from a radial direction in a cross section perpendicular to the rotor axis.

Claims

1. A rotor disk of a rotor comprising: serrations, at least on one side, for torque transmission, comprising a plurality of teeth distributed over the circumference, the tooth flanks of which are aligned opposite with respect to a respective central plane, wherein the tooth flanks have a course that deviates from a radial direction in a cross section perpendicular to the rotor axis.

2. The rotor disk as claimed in claim 1, further comprising: an inner disk portion and a central portion, on the front end of which the serrations are arranged, and an outer fastening portion, which has a plurality of blade retention grooves distributed over the circumference.

3. The rotor disk as claimed in claim 1, further comprising: an axially extending sleeve portion and a connection flange, which extends radially inward and/or outward on said sleeve portion and on the front face of which the serrations are arranged.

4. The rotor disk as claimed in claim 3, further comprising: a plurality of fastening holes distributed over the circumference in the connection flange.

5. The rotor disk as claimed in claim 1, wherein the tooth tip of each tooth extends radially with respect to the rotor axis; and/or wherein the two tooth flanks of each tooth are mirror-symmetrical with respect to the central plane.

6. The rotor disk as claimed in claim 1, wherein the teeth have a centering portion, the tooth flanks of which extend substantially radially and a locking portion adjoining radially on the outside and/or on the inside, wherein the spacing of the tooth flanks relative to one another increases or decreases in the locking portion, deviating in this respect from the centering portion.

7. The rotor disk as claimed in claim 6, wherein the tooth flanks have an arc-shaped course in cross section in the locking portion; and/or wherein the tooth flanks have a linear course in cross section in the locking portion.

8. The rotor disk as claimed in claim 6, wherein the tooth tips extend substantially radially in the centering portion and in an arc shape and/or in a linear radial-axial direction at an angle to the centering portion in the locking portion, when viewed in longitudinal section.

9. The rotor disk as claimed in claim 8, wherein the tooth tips in the locking portion slope by at least 0.25, relative to the centering portion; and/or wherein the tooth tips in the locking portion slope by at most 15, relative to the centering portion.

10. A rotor, comprising: a first rotor disk as claimed in claim 1, and a second rotor disk, wherein the sets of serrations of the rotor disks are arranged so as to engage in one another.

11. The rotor as claimed in claim 10, wherein the rotor disks are connected by means of a plurality of fastening bolts passing through the fastening holes in the first connection flange and/or the second connection flange.

12. The rotor as claimed in claim 10, wherein, when the first tooth flanks are resting on the second tooth flanks in the centering portion, there is a gap between the first tooth flanks and the second tooth flanks in the locking portion.

13. The rotor as claimed in claim 12, wherein the gap in the locking portion is at least 0.01 mm, and/or at most 2 mm.

14. The rotor as claimed in claim 12, wherein the gap becomes continuously larger toward the outside; and/or wherein the gap is substantially constant; and/or wherein the gap is larger in the region of the fastening bolts than in the region between two fastening bolts.

15. The rotor disk as claimed in claim 1, wherein the rotor disk is of a rotor of a gas turbine.

16. The rotor disk as claimed in claim 2, wherein the plurality of blade retention grooves comprise axially extending blade retention grooves, distributed over the circumference.

17. The rotor disk as claimed in claim 6, wherein the tooth flanks form a set of Hirth-type serrations.

18. The rotor disk as claimed in claim 9, wherein the tooth tips in the locking portion slope by at least 0.5, linearly, relative to the centering portion; and/or wherein the tooth tips in the locking portion slope by at most 5, linearly, relative to the centering portion.

19. A rotor of a gas turbine, comprising: a first rotor disk and a second rotor disk, both rotor disks as claimed in claim 1, wherein the sets of serrations of the rotor disks are arranged so as to engage in one another.

20. The rotor as claimed in claim 13, wherein the gap in the locking portion is at least 0.1 mm, and/or at most 0.2 mm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In the figures below, two illustrative embodiments of a rotor and, associated with this, two illustrative embodiments of the tooth flanks are depicted diagrammatically. Of the figures:

[0040] FIG. 1 shows a first illustrative embodiment of a rotor having a widening gap in the serrations;

[0041] FIG. 2 shows a second illustrative embodiment of a rotor having a constant gap in the serrations;

[0042] FIG. 3 shows a longitudinal section through the serrations;

[0043] FIG. 4 shows a cross section through two teeth of the serrations in FIG. 3;

[0044] FIG. 5 shows another longitudinal section through an alternative set of serrations with an arc-shaped course;

[0045] FIG. 6 shows a cross section through two teeth of the serrations in FIG. 5.

DETAILED DESCRIPTION OF INVENTION

[0046] A first illustrative embodiment of a rotor according to the invention is depicted diagrammatically in FIG. 1. Two disks 01 and 02, shown by way of example, which 01, 02 are connected to one another by serrations 21, 22, can be seen. The rotor disks 01, 02 each have a disk portion 11, a central portion 12 and a fastening portion 13. Respective sleeve portions 14, on the ends of which there are respective connection flanges 10, are arranged in the central portion 12 on both sides of the center. There are respective fastening holes 16 in the connection flange 15, said holes being distributed over the circumference. The two rotor disks 01, 02 are connected via the sets of serrations 21, 22 present on the front face of the connection flange 15. In this illustrative embodiment, it is envisaged that the serrations 21, 22 of the rotor disks 01, 02 have a centering portion 41 and a locking portion 42, wherein a gap 28 which 28 widens continuously, starting from the central portion 41, is formed in the locking portion 42.

[0047] Another illustrative embodiment relating to this is shown by FIG. 2, likewise having two rotor disks 03 and 04, which 03, 04 correspondingly have a disk portion 11, a central portion 12 and a fastening portion 13. Once again, the rotor disks are connected via respective connection flanges 15, which 15 are arranged on sleeve portions 14. Once again, there are fastening holes 16 distributed over the circumference in the connection flanges 15. Once again, the rotor disks 03, 04 are connected to one another via sets of serrations 23, 24, which 23, 24 are divided into a centering portion 41 and a locking portion 42. In contrast to the previous illustrative embodiment, it is now envisaged that the gap 29 in the locking portion 42 between the sets of serrations 23, 24 is substantially constant.

[0048] A tooth 31 of set of serrations 21 is then depicted diagrammatically in detail in longitudinal section through the first rotor disk 01 in FIG. 3. It shows the sleeve portion 14 with the connection flange 15, on the front face of which the set of serrations 21 having the tooth 31 is situated. The tooth 31 is divided into the radially inner centering portion 41 and the outer locking portion 42. Here, it is envisaged that the tooth flanks or tooth 31 extends radially in the centering portion 41. In contrast, the tooth in the locking portion 42 extends on a slope relative to the radial direction.

[0049] In this regard, FIG. 4 depicts diagrammatically the embodiment of set of serrations 21 in cross section through two teeth 32 perpendicularly to the rotor axis. Once again, it shows the centering portion 41 and, radially on the outside, the locking portion 42. The tooth flanks 36 of the respective teeth 31 are embodied symmetrically with respect to a central plane through the rotor axis. In corresponding fashionwhen considering this view of set of serrations 21 along the rotor axisthe tooth tips 37 and likewise the respective tooth root 38 between two teeth 31 extend in a radial direction. If the section through the teeth 31 is then considered, it is immediately apparent that the tooth flanks 36 in the central portion 41 have the undiminished radial course. In contrast, the section curves of the cross section through the teeth 31 widen relative to one another in the locking portion 42 and thus have a course which deviates from the radial direction.

[0050] An alternative illustrative embodiment of the shaping of the teeth 31 is then depicted diagrammatically in FIG. 5. Once again, the sleeve portion 14 with the connection flange 15, on the front face of which set of serrations 25 is situated, can be seen in longitudinal section. The teeth 31 thereof once again have a centering portion 41 with a radial course and a locking portion 42. In contrast to the previous illustrative embodiment in FIG. 3, the teeth 31 have an arc-shaped course when viewed in longitudinal section.

[0051] In this regard, FIG. 6, similarly to FIG. 4, diagrammatically depicts a cross section through set of serrations 25, through two teeth 35. The tooth flanks 36 of the teeth 35 are formed in a correspondingly mirror-symmetrical fashion relative to a central plane through the rotor axis. In corresponding fashion, the tooth tips 37 and the respective tooth root 38 extend undiminished in a radial direction when the serrations are considered in this view along the rotor axis. However, the tooth flanks 36 sectioned in the cross section, i.e. the section curves, have an arc-shaped course which deviates from the radial direction in the locking portion 42.