WO2020260055A1

WO2020260055A1 - Planetary gear carrier having an outer circumferential inlet opening for radial supply of a sun gear as well as of planetary gears

Info

Publication number: WO2020260055A1
Application number: PCT/EP2020/066503
Authority: WO
Inventors: Matthias Biertz
Original assignee: Aerospace Transmission Technologies GmbH
Priority date: 2019-06-22
Filing date: 2020-06-15
Publication date: 2020-12-30
Also published as: EP3976996A1; DE102020115733A1

Abstract

The invention relates to a planetary gear carrier (30), in particular for a planetary gearing of a transmission for an aircraft drive turbine, said planetary gear carrier (30) having two parallel, spaced-apart base plates (10, 20) for receiving a sun gear (5) and planetary gears (6) which can be arranged around same and can be engaged with the sun gear (5), wherein the base plates (10, 20) of the planetary gear carrier are connected to one another via cross-pieces (4) and cannot be detached from one another in a non-destructive manner, wherein the cross-pieces (4) are at a distance (A11) from one another on an outer circumference at least at an inlet opening (11), which enables planetary gears (6) to be introduced against a radial direction (R), inwards between the base plates (10, 20) and to be engaged with the sun gear (5).

Description

Planetary gear carrier with an outer circumferential insertion opening for the radial supply of a sun gear and planetary gears

description

The invention relates to a planet carrier and a

Method for manufacturing and assembling a planet carrier. A generic planetary gear carrier is disclosed in US Pat. No. 8,667,688 B2. That disclosed in US 8,667,688 B2

The planetary gear carrier has two spaced-apart base plates that are permanently connected to one another via webs. The base plates are designed to accommodate a plurality of planet gears and a sun gear between them so that the planet gears with externally arranged gear rings can be brought into engagement with externally arranged gear rings on the sun gear.

Sun gears for aircraft turbines have one

Double helical teeth so that axial forces are avoided during operation. The outer periphery is between the webs

There are recesses at which the mounted planet gears can be brought into engagement radially on the outside with an internally toothed ring gear. The recesses are separated from one another by the webs. The planetary gear carrier is mounted by first mounting and positioning the planetary gears through a central opening in one of the base plates.

A central sun gear is then introduced. The

The sun gear is then not yet in meshing engagement with the planet gears. In order to provide the meshing engagement, these must be moved radially inwards onto the sun gear, since the gears move due to the double helical toothing is not possible in the axial direction. Only in this position can the planet gears be rotatably fixed to the base plates.

An object of the present invention is seen in ensuring that the planetary gear carrier can be assembled more easily. Furthermore, according to a further object, the production of the planetary gear carrier is to be simplified.

The tasks are achieved by a planet carrier and a method for manufacturing and also for assembling a

Planet carrier according to the independent claims.

The subclaims can be combined with one another in any technologically meaningful way, in particular if their subject matter is explicitly disclosed.

The description, in particular in connection with the figures, additionally characterizes and specifies the invention.

Accordingly, a planetary gear carrier is provided, in particular for a planetary gear of a transmission for a

Aircraft drive turbine, the planetary gear carrier having two parallel spaced-apart base plates for receiving one

The sun gear and the planet gears that can be arranged around it and can be brought into engagement with the sun gear, the base plates of the planet gear carrier being connected to one another via webs and not being detachable from one another without being destroyed, characterized in that the webs are at a distance from one another at least at one insertion opening on the outside circumference which allows

Planet gears against a radial direction inward between insert the base plates and bring them into engagement with the sun gear.

As a result, the central opening can have a diameter which is greater than an outer diameter of the planetary gears. Namely, the planet gears do not have to fit through the central opening, since they can be mounted from the outside through the insertion position. The planet gears weigh in

Aircraft propulsion turbines up to 50 kg. Installation by hand through the central opening is made even more difficult by sharp-edged teeth. Through the insertion opening the

Planet gears are easily introduced radially from the outside. During assembly, the planet gears no longer have to be held, they can be fixed directly to the base plates during assembly, at least the first two or three planet gears can be rotatably fixed between the base plates immediately after their introduction.

In one embodiment, a central opening has to

Passing a shaft in the radial direction

Opening diameter which is smaller than a diameter of the sun gear, the insertion opening having a diameter which allows the sun gear to be introduced inwardly between the base plates against a radial direction.

According to this embodiment, in addition to the planetary gears, the sun gear is also introduced radially from the outside. Because it is no longer necessary to be able to insert the sun gear through the central opening, a central opening can be used

Passing through a shaft on which the sun wheel sits in operation, are made smaller. A rigidity opposite Deformations of the planet carrier can be increased because more material can be filled radially inward in both base plates radially outside the central opening. Furthermore, the assembly can now take place by first introducing several, preferably all, planet gears except for one radially inward and fixing them rotatably between the base plates.

Then the sun gear is through the insertion opening

introduced and one or two last planet gears, which are located directly on the insertion opening, introduced and rotatably fixed. A final movement of the planet gears radially inward is no longer necessary, since planet gears are now introduced radially last and not the sun gear axially.

As stated in the introduction, these are gears with double helical teeth, which cannot be axially displaced with respect to one another as long as they are in meshing engagement with one another. According to the invention, this is also not necessary since the insertion opening enables assembly by displacement and rotation in a plane parallel to the radial direction.

As a result, the planetary gear carrier can be constructed in a more compact manner, because mobility in the radial direction outward away from the sun gear and back towards it opposite to the radial direction is no longer necessary.

Due to the more compact structure of the planetary gear carrier, a weight saving can be achieved compared to planetary gear carriers with central gear assembly. Furthermore, the weight saved is on the outside of the planet carrier, since this can have a smaller diameter in the radial direction. As a result, the weight saving goes hand in hand with a considerable reduction in the mass inertia of the planetary gear carrier, which in turn increases the efficiency of the aircraft engine in which the planetary gear carrier is to be used.

In a further embodiment, a web is mounted at an insertion position, which after an insertion of the

Planetary gear to complete the planetary gear

Base plates, connecting them together, was mounted.

The mounted bar closes the insertion opening and increases the rigidity of the planetary gear carrier.

In a further embodiment, a recess is present on each of the base plates, which has a cavity into which the web engages with an outer contour that fills the recess or cavity in a form-fitting manner.

The web engaging into the cavities on both sides provides a stable connection between the web and the base plates, which is immediately recognizable as such before the web is introduced, according to the poka yoke principle.

In a further embodiment, the web is with the

Base beams, closing the insertion opening on both sides, welded.

A screw connection by means of several screws, for example with countersunk screws, can be released. For maintenance or replacement of the gears, the planet carrier can be opened in the embodiment with a screwed bar. In a further embodiment, the base plates have an axial recess in the area of the insertion opening, so that a contact line between the web and the base plates is accessible from the radial inside and a weld seam can thus be applied to the contact line.

According to this configuration, the web can be additionally secured by a weld seam applied from the inside. To further explain the arrangement of the radially from the inside

applied weld is to the corresponding

Reference embodiment.

According to a further embodiment, the web is the insertion opening at one end in each case with the two base plates

closing, screwed.

According to a further embodiment, the web was made by means of a build-up welding process in which a

Welding device which is designed to be guided along a contour of the web and thereby material

to apply, filled up.

Deposition welding corresponds to a 3D printing process in which metal is applied directly and no sintering step is necessary. If necessary, there are still another

Deburring or surface treatment of the printed web necessary. After the build-up welding of the bar, it is connected in one piece to the base plates.

For the build-up welding, the same material can be used as it is also used for the base plates, or a material more suitable for build-up welding, or a softer material.

In a further embodiment, at least one web, which adjoins the insertion opening, has a width, measured on the circumference, which is smaller than a width of further webs. The bridge can be referred to as a narrow bridge. This narrow web is completed by a web plate that narrows the insertion opening and the web is closed off radially to the outside. Two adjacent webs can also have a smaller width in order to form an insertion opening.

In other words, in one embodiment a web can be missing at one point so that the sun gear and the planetary gears can be inserted, or one or two webs are made so narrow that there is a sufficiently large insertion opening between them for the radial introduction of the sun gear and the planetary gears.

In both cases it is planned to close the bridge

complete or complete so that it does not stand out from other webs that are completely formed

differs. A fully formed web surrounds the gears adjoining it.

In a further embodiment, the mounted web is formed from a material that has a higher elasticity and a lower hardness than a material from which the base plates are formed. By using such a more elastic and softer material for the web, a damping function of the web can be realized.

Furthermore, to solve the previously mentioned problem

proposed a method of manufacturing a

Planet carrier with the steps:

- Provision of two base plates, which are connected to one another in one piece via webs and are held in parallel via the webs,

- Provision of a centrally between the base plates rotatably mountable sun gear, which a

Has double helical teeth,

- Provision of several planet gears which can be arranged on the outside of the sun gear and which also have double helical gearing that can be brought into engagement with the double helical gearing of the sun gear,

- Insertion of the sun gear between the base plates against a radial direction from the outside between the base plates through an insertion opening at which the webs are spaced apart

each other, which allows radial insertion,

- Closing the insertion opening by one of the

Insertion opening mountable bar.

According to one embodiment of the method, the

mountable bar welded to the base plates.

It is provided here that the web missing at the insertion opening or the web completing the narrow web on an upper side with the upper base plate and a lower side with the lower one Weld the base plate. On the essentially cylindrical planet carrier, the web is in a radial direction

inwardly accessible from the outside so that it can be welded to the base plates at the top and bottom outside.

According to a further embodiment of the method, further weld seams are made on a recess on the base plates through which the web is accessible from radially inward

brought in .

The weld seam on the inside can complement the weld seam on the outside. The web or the connection between the web and the base plates can thus withstand greater loads.

According to a further embodiment of the method, the mountable web is screwed to the base plates.

The screw connection can be opened again more easily than a weld seam. Maintenance can thus be carried out on the planetary gear carrier even after operation.

In most cases, the screw connection is used instead of the

Welding made, but combinations of screwed and welded bars are conceivable.

According to a further embodiment of the method, the mountable web is between the base plates by means of a

Build-up welding process in which a welding device which is designed to be guided along a contour of the web and in the process to apply material is filled. Build-up welding is a process in which a three-dimensional body, in this case the web, is formed in layers by following a contour and possibly also filling a body with a welding nozzle that applies material. This makes it almost one-piece

Planetary carrier created, which macroscopically does not differ from a planetary carrier with all around closed

Insertion openings or closely spaced webs

differs.

According to a further embodiment of the method, a material is welded on for the build-up welding of the web which has a higher elasticity and a lower hardness than a material from which the base plates are formed.

By using a softer material, which has a higher elasticity and a lower hardness, you can

for example, damping properties can be realized in the web. A possible material for this is aluminum bronze or 2.0921 or CuA18.

Furthermore, a web can also be created by build-up welding

be applied, which is formed in layers from several different materials. By using several different materials with different stiffness and different damping properties, a natural frequency of the web can be increased or decreased in a targeted manner.

The drawings described herein are for the purpose only

For purposes of illustration and not intended to limit the scope of the present disclosure in any way. Show it: 1 shows a front view of a planetary gear carrier from the prior art,

Fig. 2: a side view of the planet carrier from the prior art,

3: a planet carrier from an axial perspective,

4: a planetary gear carrier from a radial perspective, with an insertion opening for inserting gearwheels from a radial direction, a web being missing in the insertion opening,

Fig. 5: a planet carrier from a radial perspective, with a closed by a mountable web

Insertion opening,

6: a planetary gear carrier with a mountable, in this case screwed, web,

7: a planet gear carrier with an insertion opening in which a web is missing and two base plates as well as recesses provided therein,

8: a web that can be mounted on the planetary gear carrier shown in FIG. 7, with an outer contour that fits into the recess on the base plates, and FIG

9: a planet gear carrier with a web, measured on the outer circumference and, compared to other webs, narrower, which has a sufficiently wide insertion opening, 10: schematically, a layered structure of a web in the build-up welding process, and

11: schematically, a process sequence for manufacturing a planet gear carrier with a sun gear, a planet gear and a web that can be mounted in an insertion opening.

The following description is merely in essence

illustrative. For the sake of clarity, the same reference numbers have been used in the drawings to identify similar elements.

It should be noted that steps within a method can be performed out of order without changing the principles of the present disclosure.

The fact that not every conceivable fastening option for the web is disclosed does not mean that connection options are not included in the scope of protection. In particular, the narrow web from Figure 9 can be replaced by the in the other figures

disclosed webs are supplemented, an explicit disclosure of this is dispensed with for the sake of clarity.

FIG. 1 shows a planetary gear carrier 3 from the prior art from an axial direction A. FIG. 2 shows the planetary gear carrier 3 from the prior art from a radial direction R. The planetary gear carrier 3 has two spaced-apart base plates 1 and 2, which are connected via webs 4 are inextricably linked. The base plates 1 and 2 are designed to have several

To accommodate planet gears 6 and a sun gear 5 between them in such a way that the planet gears 6 with gear rings 7 arranged on the outside in engagement with externally arranged gear rings 7 on the sun gear

5 can be brought. There are recesses on the outer circumference between the fixed webs 4, on which the mounted planet gears 6 do not engage radially on the outside with one

internally toothed ring gear shown can be brought. The recesses are separated from one another by the webs 4. The planetary gear carrier 3 is assembled by first the

Planet gears 6 through a central opening 9 in one of the

Base plates 1 or 2 is mounted and positioned.

A central sun gear 5 is then introduced. For this purpose, the central opening 9 has a diameter D1 which is greater than a diameter D2 of the sun gear 5

Sun gear 5 is then not yet in meshing engagement with the planetary gears 6. To provide the meshing engagement, they must be moved inwardly against the radial direction R on the sun gear 5, since due to a

Double helical toothing 8 a movement of the gears 5 and 6 against each other in the axial direction A is not possible. Only in this position can the planet gears 6 be rotatably fixed on the base plates 1 and 2.

FIG. 3 shows, from an axial direction A, planetary gear carrier 30, in particular for a planetary gear transmission, not shown.

FIG. 4 shows the planetary gear carrier 30, seen against a radial direction R. The planetary gear carrier 30 has two

parallel spaced-apart base plates 10 and 20 for receiving a sun gear 5. Planet gears can be placed around the sun gear 5

6 are arranged, which with the sun gear 5 in meshing

Are brought into engagement. The base plates 10 and 20 des

Planetary gear carriers 30 are connected to one another via fixed bars 4 connected. Fixed means that the webs 4 cannot be detached from the base plates 10 and 20 without being destroyed. The fixed webs 4 have at least one insertion opening 11

outer circumference a distance from each other, which allows planet gears 5 against the radial direction R inwardly between the base plates 10 and 20 and with the

To bring sun gear 5 into engagement. The insertion opening 11 has a width All which allows the sun gear 5 to be inserted inwardly between the base plates 10 and 20 counter to a radial direction R. In the one shown in FIG

Embodiment there is no web at the insertion opening 11.

A central opening 90 for the passage of a non

Shaft shown, on which the sun gear 5 sits in operation, has an opening diameter A90 in the radial direction R, which is smaller than a diameter D2 of the sun gear 5. Mounting the sun gear 5 through the central opening 90 is therefore not possible and not required, it is now inserted through the insertion opening 11 between the base plates 10 and 20. In the one shown in Figures 3 and 4

In the exemplary embodiment, one of the webs is missing, which is particularly clear in FIG. The remaining fixed webs 4 connect the base plates 10 and 20 to one another.

After the sun gear 5 and the planetary gears 6 have been introduced through the insertion opening 11, the planetary gear carrier 30 can be completed by mounting a mountable web 41 on the insertion opening 11 as shown in FIG. The web 41 connects the base plates 10 and 20 to one another and, geometrically, the web 41 no longer differs from the fixed webs 4 after assembly. A mobility of the planet gears 6 in the radial direction R as in the prior art according to FIGS. 1 and 2 is no longer required in the embodiments described herein because the gears 5 and 6 in a direction to the radial

parallel plane E can be moved and into the

Double helical gears 8 can be brought into meshing engagement with one another in this way. A diameter of the

As a result, base plates 10 and 20 can turn out to be smaller, which results in a lower mass inertia of the planetary gear carrier.

The following are combinable with each other

Attachment methods for attaching the web 41 to the

Base plates 10 and 20 described. The planetary gear carrier 30 is essentially balanced with the mounted web 41; a subsequent balancing process may be necessary. Geometric

the mounted web 41 does not differ from the fixed webs 4.

FIG. 6 shows a planetary gear carrier 30, in which the web 42 is screwed at one end 14 to the two base plates 10 and 20 by means of screws 12 shown schematically.

FIG. 7 shows a planet gear carrier 30 on the base plates 10 and each has a recess 15 which has a cavity 16 into which the web 43 shown in FIG. 8 engages with an outer contour 17 that fills the cavity 16 or the recess 15 in a form-fitting manner. The cavity 16 can have a rectangular shape, as shown, and a slot nut 18 that fits exactly into the rectangular cavity 16 can be provided on the web 43. After the web 43 has been mounted on the base plates 10 and 30, one cannot run along the contour of the recess 15

weld seam shown are applied to the web 43 with to connect the two base plates 10, 20 finally. A

However, screwing of the web shown in accordance with FIG. 6 is also conceivable, for example also for fixing before welding.

A welded connection between the base plates 10 and 20 with the web 41, 42 and 43 can be developed in that the web 41, 42, 43 through a recess 19 in the base plates 10 and 20 at a contact line 21 between the web 41, 42 and 43 and the base plates 10 and 20 remains accessible from the inside and is welded to the base plates 10 and 20 here. The web, which is not shown in FIG. 3 and is still missing, is hollow on the inside. The contact line for a welding tool can be easily reached through the recess 19. In addition, the inertia of the planetary gear carrier 30 can be further reduced by the hollow web 41.

Figure 9 shows a planetary gear carrier 30 with a narrow web 44, which the radial insertion of the gears 5 and 6 with

Double helical toothing 8 allowed, but afterwards still with one of the web elements 41, 42, 43 or 45 according to FIGS.

6, 7, 8 or 10 is added.

FIG. 10 shows, very schematically, a layered structure of a web 45 between the base plates 10 and 20 through a

Deposition welding process. In the build-up welding process, a contour 51 of the web 45 is applied in layers by a welding device 52. The welding device 52 can

electrically, with a laser or with an electric arc. Welding material can be fed in in the form of a wire or applied as a powder between welding processes. The The web 45 formed by the build-up welding in the 3D printing process can then with the appropriate choice of material and

Post-processing can hardly be distinguished from a web 4 previously formed in one piece with the base plates 10 and 20.

In Figures 3 to 8 and 10 planetary carriers 30 are with

originally missing webs 41, 42, 43, 44, 45 as well

various webs for filling the insertion opening 11 are shown. As an alternative to this, the webs 44 could also be made so narrow that an insertion opening 11 remains, as shown in FIG. This narrower fixed web 44 is also to be completed with one of the webs 41, 42, 43 or 45 or closed to the outside.

FIG. 11 clearly shows a sequence of process steps which can be used to manufacture a planet gear carrier 30 according to FIGS. 3 to 8. This is done in step 101

Provision of two base plates 10 and 20 which are connected to one another in one piece via webs 4 and are held in parallel via webs 4. This is done in step 102

Provision of a centrally between the base plates 10 and 20 rotatably mountable sun gear 5, which a

Has double helical teeth 8. In step 103, several can be arranged on the outside of the sun gear 5 are provided

Planetary gears 6, which also have a double helical toothing 8, which can be brought into engagement with the double helical toothing 8 of the sun wheel 5. In step 103, the sun gear 5 is inserted counter to a radial direction R from the outside between the base plates through the insertion opening 11, at which the webs 4 are spaced apart from one another by a radial insertion allows. This is done in step 104

Closing the insertion opening 11 by one on the

Insertion opening 11 mountable or welded web 41, 42, 43, 45. Step 104 can be carried out according to FIG. 5 by any method of mounting a web 41. Step 104 can take place by screwing the web 42 according to FIG. The step 104 can also be implemented by a web 43, which has outer contours 17 which can be inserted into a recess 15 on the base plates 10 and 20. If necessary, the web 43, which is fitted with a positive fit in this way, is screwed or welded to the base plates 10 and 20. The welding can also be done by the

Recess 19 take place from the inside in the web (see Figure 3).

Furthermore, step 104 can also take place by inserting a web 45 corresponding to that shown in FIG

Deposition welding process in layers on a first

Base plate 10 is built up until the web 45 is a second

Base plate 20 reached. Furthermore, as shown in FIG. 9, a narrow web 44 can allow the radial insertion of the gears 5 and 6 with double helical teeth 8, but can be supplemented with one of the web elements 41, 42, 43 or 45 afterwards.

Reference character list

1 base plate

2 base plate

3 planetary gear carriers

4 bars

5 sun gear

6 planetary gear

7 ring gears

8 double helical teeth

9 central opening

10 base plate

11 insertion opening

12 screws

14 end

15 recess

16 cavity

17 outer contour

18 slot nut

19 recess

20 base plate

51 contour

52 welding device

101 step

102 step

103 step

104 step

A axial direction

All distance

A90 opening diameter Dl diameter D2 diameter

E level

Claims

1. Planet carrier (30), especially for a

Planetary gear of a transmission for one

Aircraft drive turbine, the planetary gear carrier (30) having two parallel spaced-apart base plates (10, 20) for receiving a sun gear (5) and planet gears (6) that can be arranged around it and thereby mesh with the sun gear (5), the base plates (10, 20 ) of the planetary gear carrier are connected to one another via webs (4) and cannot be detached from one another in a non-destructive manner, characterized in that the webs (4) at least at one insertion opening (11) have a spacing (All) from one another on the outer circumference, which allows planet gears (6) against a radial direction (R) inwardly between the base plates (10, 20) and to bring them into engagement with the sun gear (5).

2. Planet carrier (30) according to claim 1, characterized

characterized in that a central opening (90) for

Passing a shaft on which the sun gear (5) is seated in the radial direction (R) has an opening diameter (A90) which is smaller than a diameter (D2) of the sun gear (5), the insertion opening (11) having a diameter (All), which allows the sun gear (5) against a radial

Direction (R) inwards between the base plates (10, 20)

to introduce.

3. Planet carrier (30) according to claim 1 and / or 2, characterized in that a web (44) is mounted on the insertion opening (11), which after an insertion of the

Planet carrier (30) completing planet gear (6) to the Base plates (10, 20), connecting them to one another, was mounted.

4. Planetary gear carrier (30) according to claim 3, characterized in that a recess (15) is present on each of the base plates (10, 20) which has a cavity (16) into which the web (43) with a cavity ( 16) or the recess (15)

engages positively filling outer contour (17).

5. Planet carrier (30) according to one of claims 1 to 4, characterized in that the web (41, 42, 43, 45) is welded to the base carriers (10, 20), closing the insertion opening (11) on both sides.

6. Planet carrier (30) according to one of claims 1 to 5, characterized in that the base plates (10, 20) in the region of the insertion opening (11) have an axial recess (19), so that a line of contact between the web (41 , 42, 43, 45) and the base plates (10, 20) is radially accessible from the inside and thus a weld seam can be applied to the contact line.

7. Planet carrier (30) according to one of claims 1 to 5, characterized in that the web (42) is screwed at one end (14) to the two base plates (10, 20) closing the insertion opening (11).

8. planet carrier (30) according to any one of claims 1 to 5, characterized in that the web (45) by means of a

Deposition welding process in which a welding device

(52), which is designed to follow a contour (51) of the Web (45) to be guided and thereby to apply material, was filled.

9. Planet carrier (30) according to one of claims 1 to 8, characterized in that at least one web (44) which adjoins the insertion opening (11), measured on the circumference, has a width which is less than a width of further webs ( 4), and in that one that narrows the insertion opening (11)

Step plate completes the web (44) and closes it radially outwards.

10. Planet carrier (30) according to one of claims 1 to 9, characterized in that the mounted web (41, 42, 43, 45) is formed from a material which has a higher elasticity and a lower hardness than a material from which the base plates (10, 20) are formed.

11. A method for manufacturing a planet carrier (30) with the steps

- Provision of two base plates (10, 20) which are connected to one another in one piece via webs (4) and are held in parallel via the webs (4),

- Provision of a centrally between the base plates (10, 20) rotatably mountable sun gear (5), which a

Has double helical teeth (8),

- Provision of several planet gears (6) which can be arranged on the outside of the sun gear (5) and which also have a double helical toothing (8) which is connected to the double helical toothing (8) of the

Sun gear (5) can be brought into engagement,

- Insertion of the sun gear (5) between de base plates (10, 20) against a radial direction (R) from the outside between the Base plates (10, 20) through an insertion opening (11) at which the webs (4) are spaced apart (All) from each other, which allows radial insertion,

- Closing the insertion opening (11) by one of the

Insertion opening (11) mountable web (41, 42, 43, 45).

12. The method according to claim 11, characterized in that the mountable web (41, 42, 43, 45) is welded to the base plates (10, 20).

13. The method according to claim 11, characterized in that further weld seams are introduced through a recess (19) on the base plates (10, 20) through which the web (41, 42, 43) is accessible from radially inward.

14. The method according to claim 11, characterized in that the mountable web (42) is screwed to the base plates (10, 20).

15. The method according to claim 11, characterized in that the mountable web (45) between the base plates (10, 20) by means of a build-up welding process in which a

Welding device (52), which is designed to be guided along a contour (51) of the web (45) and to apply material, has been filled.

16. The method according to claim 15, characterized in that a material is welded on for the build-up welding of the web (45) which has a higher elasticity and a lower hardness than a material from which the base plates (10, 20) are formed.