Planet Carrier Assembly

Abstract

The present invention relates to a planet carrier assembly (1) consisting of at least one first carrier cheek (2) of a planet carrier (3) and at least one shaft (4), wherein the first carrier cheek (2) and the shaft (4) are joined to each other at a first joining zone (5) formed axially between an axial stop (7) of the shaft (4) and the first carrier cheek (2).

Description

[Technical Field]

[0001] The present invention relates to a planet carrier assembly consisting of at least one carrier cheek of a planet carrier and at least one shaft, the shaft being provided with at least one guiding surface and at least one axial stop axially adjacent to the guiding surface, a holder of the carrier cheek being radially supported on the guiding surface and centered on an axially aligned rotation axis of the shaft, the carrier cheek and the shaft being at least substantially connected to each other in at least one joining zone. [Background technology]

[0002] A planetary gearbox having this type of planet carrier assembly is disclosed in DE11 2012 000 461 B4. This planetary gearbox is formed by planet gears, planet pins, and a planet carrier assembly. The planet carrier assembly is composed of various components. One component is a planet carrier composed of two carrier cheeks, and another component is a shaft with a radial flange. The planet carrier has two carrier cheeks made of sheet metal, which are axially connected to each other by webs and planet pins. The planet carrier and the shaft are permanently materially connected to each other. According to the embodiment shown in FIG. 1 of DE11 2012 000 461 B4, one of the carrier cheeks has a through hole with an inner cylindrical guide surface. The inner diameter of the guide surface nominally corresponds to the outer diameter of the outer cylindrical guide surface of the flange. Each guide surface is axially adjacent by a chamfer on one side. The carrier cheek is disposed on and supported by the flange such that the inner and outer cylindrical guide surfaces are concentric and radially aligned with one another, thereby concentrically guiding the planet carrier to the shaft or radial flange. The annular shoulder of the carrier cheek has an inner diameter smaller than the outer diameter of the outer cylindrical guide surface of the flange and is axially adjacent to the through hole. This annular shoulder forms an axial stop. The axial stop ensures that the two mating surfaces are axially aligned with one another, concentrically radially opposed to one another, and not axially offset from one another. The carrier cheek is axially supported on the carrier cheek via the stop. Due to the opposing conical mating surfaces or chamfers, an axially aligned, arrow-shaped annular groove is formed at this point. As a result, the planet carrier and the shaft are substantially irremovably coupled to one another with an axially aligned V-seam. Summary of the Invention [Problem to be solved by the invention]

[0003] The object of the present invention is to create an optimized planet carrier assembly. [Means for solving the problem]

[0004] This object is achieved by the subject matter of claim 1.

[0005] In the joint zone formed axially between the axial stop and the carrier cheek, provision is made for joining the carrier cheek and the shaft to one another. The joint zone is thus perpendicularly penetrated by the rotation axis of the shaft, and a weld seam is formed through or within the joint zone in at least one radial plane extending axially. The weld seam therefore extends radially in depth. The joint zone is formed prior to the material-fixing connection, for example, by a joint formed between components that are placed adjacent to one another in the axial direction. In welding technology, such weld seams are also called butt welds. At the joint, the components face each other or rest against each other with or without play.

[0006] The advantage of the present invention is that the welding head of the welding device can be fed directly perpendicular to the rotation axis, i.e., radially, into the joining zone without being obstructed by other components. This advantage is particularly evident when, according to one embodiment of the present invention, a further welding seam must be created between two carrier cheeks of a planet carrier of a planet carrier assembly. In this case, the welding head must also be fed radially, i.e., the joining zone is again penetrated perpendicularly by the rotation axis of the shaft and lies in at least a radial plane extending axially through the welding seam or within the joining zone. This is necessary, for example, when the carrier cheeks are designed as one and the same part. In this case, the welding process is optimized, since the welding head does not need to be rotated when changing between welding seams. Otherwise, when changing between welding points, the welding head would need to be rotated from the axial feed direction to the radial feed direction or vice versa when welding two joining zones consecutively. As a result, the welding device must have a more complex design because the welding head must be able to pivot, and the pivoting increases the overall cycle time required for welding.

[0007] In the configurations already described in the background section of DE11 2012 000 461 B4, the weld seam extends axially deeply. Therefore, the welding head must be fed axially. When designing such a planetary carrier assembly, care must be taken to ensure that there is a sufficient radial distance between the joining zone and the shaft, taking into account the dimensions and radial freedom of the welding head, so that the welding head can be fed axially without interference. The advantage of the present invention, however, is that the distance between the joining zones can be realized directly on the shaft or at a radial distance from the shaft, regardless of the dimensions of the welding head.

[0008] The above embodiment of the present invention is characterized in that the first carrier cheek is connected to the second carrier cheek in a second joining zone by at least one second weld seam, which is formed so as to be axial between the carrier cheeks, and the welding head is also fed from the radial direction, as a result of which the weld seam extends radially to the depth of the material in the direction of the rotation axis.

[0009] In this context, embodiments of the present invention also provide that the two carrier cheeks are designed as identical parts. An advantage of the present invention is that the forming tool(s) required to form the two carrier cheeks are the same design for both carrier cheeks. Tooling costs are saved because the tooling required to manufacture both carrier cheeks is reduced to one fixture. Additionally, due to the doubling in number, each carrier cheek can be manufactured more cost-effectively compared to individual production. In a final step, the central holes of the carrier cheeks may need to be designed differently. The hole in the holder for connecting the shaft and carrier cheek may need to be designed differently from the hole in the other carrier cheek axially opposite the holder. This may be necessary, for example, when a large sun gear must be inserted into the planet carrier through the second carrier cheek. Alternatively, the hole in the second carrier cheek may also be large, providing sufficient space for components and feed tooling for assembly or assembly of components within the planet carrier assembly.

[0010] It is conceivable that the carrier cheeks, in particular the contact points for the planetary gears, are provided with a sliding coating, for example a manganese phosphate coating.

[0011] One embodiment of the present invention provides that the guide surface for guiding the first carrier cheek extends intermittently or continuously circumferentially around the rotation axis. The function of the guide surface is to radially support and center the carrier cheek attached to the shaft with respect to the rotation axis of the shaft. The carrier cheek, together with the opposite carrier cheek, forms a planetary carrier. Alternatively, the planetary carrier may be formed from only one carrier cheek. Alternatively, the planetary carrier may be formed from other components in addition to the carrier cheek. The carrier cheek is a component that carries the planet pins of the planetary gearbox and the planet gears seated on the planet pins. Accurate centering of the carrier cheek with respect to the rotation axis of the shaft is necessary, for example, to ensure the correct center distance of the planetary pins and therefore the center distance of the planetary gears relative to the rotation axis, and thus for proper meshing with the other gears of the planetary gearbox. A shaft is understood to mean any rotationally symmetrical component that is designed as a hollow or solid material shaft or stub shaft and that can or will rotate about an axis of rotation.

[0012] A further embodiment of the invention provides that the guide surface has an external cylindrical surface in at least several sections. Such a cylindrical surface can be easily and inexpensively produced, for example, by machining a cylindrical section into the shaft or into a hub connected to the shaft. Alternatively, it is also conceivable that several partial guide surfaces, for example on at least three spoke-like projections or projections projecting radially from the shaft, are spaced apart from one another at the same pitch or at different distances on the circumferential side surface.

[0013] A further embodiment of the present invention provides that the axial stop is provided with at least one mating surface. The mating surface faces the carrier cheek, extends radially outward away from the rotation axis, and extends at least in sections or completely circumferentially around the rotation axis. A first mating zone is formed axially between the carrier cheek and the mating surface. Therefore, advantageously, the axial stop is formed on the shaft, preferably on the shaft hub, and can be easily and inexpensively technically integrated into the machining sequence for creating the external cylindrical guide surface. As a result, the manufacture of the carrier cheek can be simplified. The holder mounted on the guide surface can be inexpensively produced by punching. In previously known prior art, forming the known axial stop required introducing a step into the holder, for example, by a machining process.

[0014] A further feature of the invention provides that the shaft and the first carrier cheek are substantially connected to one another by a weld seam formed in the first joining zone, the weld seam being designed, for example, as a V-seam extending at least partially around the rotation axis.

[0015] In a weld seam, the materials of the components are substantially joined together with or without the aid of additional materials, for example in the joining zone of the weld joint where the carrier cheek and the shaft axially contact each other. Depending on their appearance in the axial longitudinal section along the axis of rotation and across the joining zone, the weld seam is defined and executed as a butt weld and fillet weld or a V-seam.

[0016] In the case of butt welding, two components are butted axially in a joint zone. In addition, a distinction is made between through-welded and non-through-welded weld seams. If the weld seam extends deep across the abutment, the seam is through-welded. In the case of a non-through-welded seam, a zone without substantial bonding remains at the depth of the joint or abutment. In the cases considered in relation to the present invention, the weld seam either extends radially deep across the abutment (joining zone), or a radially extending zone without substantial bonding remains within the joint zone, where the components rest.

[0017] In a V-seam, the surfaces for joining the materials are inclined relative to one another in a V-shape. Such surfaces are introduced into formed parts, for example, by machining or by bending, embossing, stamping, etc. V-seams are usually butt welds.

[0018] An embodiment of the present invention provides that the first carrier cheek is connected to the second carrier cheek at a second joining zone by at least one second weld seam, where the first carrier cheek is connected to the second carrier cheek at a second joining zone formed axially between the carrier cheeks by at least one second weld seam or spot weld, where the second joining zone and the second weld seam each extend at least partially radially and are thus formed axially in at least one radial plane between the carrier cheeks.

[0019] A further embodiment of the present invention provides that the guide surface and axial stop are formed on the hub, which is oriented radially away from the rotation axis and extends from the shaft. The hub is thus a component projecting radially from the shaft, or a spoke-like or disk-like section or flange projecting radially from the shaft, made together with the hub as a single part and from a single material, preferably rotationally symmetrical, and formed with an outer periphery as the guide surface and axial stop. The advantage of such an embodiment of the shaft is that the carrier cheeks can be variably adapted for each application and attached to the shaft or hub. In this case, for example, sufficient space and freedom of movement for fastening the carrier cheeks to the hub can be created only by changing the radial dimensions of the hub and holder. Alternatively, the center distance of the planet pin to the rotation axis, sun gear, or sun gear tooth can be set by the dimensions of the hub. The shaft blank has a corresponding allowance in the hub, which can then be removed to suit various requirements. Often, various requirements are imposed on the components or materials of the carrier cheeks and shaft. For example, the shaft needs to be hardened and made of a material suitable for machining, whereas the carrier cheeks of the planet carrier do not need to be hardened in all cases and can be made of steel, which is preferably suitable for cold forming. Advantageously, the hub should be made in one piece with the shaft from the same material as the shaft, as provided by embodiments of the present invention. For example, an unhardened zone that can be more easily welded can be made or provided on the hub that protrudes radially from the shaft.

[0020] The planetary gearbox with the planet carrier assembly is provided with planet pins, which are supported on the left and right sides in carrier cheeks, on which the planet gears are seated. In addition, the planetary gearbox optionally has at least one sun gear or at least one ring gear, or both. The carrier cheeks form what is called a planet web. Optionally, the support panel may be provided with additional functional elements, such as a lubricant guide structure or an oil pan.

[0021] A further embodiment of the present invention provides at least one oil pan. The oil pan is attached to one of the carrier cheeks, preferably the first carrier cheek. The carrier cheek is provided with a connecting hole, and the planet pin has an oil bore. The oil pan has at least one support plate and a channel connected to the support plate and extending around the rotation axis of the transmission device, which is axially aligned. The oil pan is also provided with an oil guide nozzle and a connecting element. The oil guide nozzle is axially inserted into one of the oil bores. The oil pan is held on the carrier cheek by the connecting element, which in each case is at least partially firmly engaged with one of the connecting holes. On the side facing away from the carrier cheek, each connecting element is followed in the axial direction by a platform. On each platform, at least one protrusion axially rising above the platform and above the surface protrudes from the flat surface of the respective platform. The advantage of this configuration is that the protrusions serve as a positional orientation aid during assembly of the oil pan on the carrier cheek, thus providing for correct assembly positioning of both the oil guide nozzle into the oil bore and the connecting element into the connecting hole. In addition, if the protrusions are appropriately designed, the oil pan can also be gripped or guided onto the protrusions during assembly.

[0022] One embodiment of the present invention provides that the respective surfaces from which the respective projections project axially extend in an imaginary radial plane perpendicularly penetrated by the axis of rotation. The flat surfaces of all the platforms may lie in a common imaginary radial plane, or may be axially offset from one another in radial planes axially spaced from one another. The advantage of such an arrangement is that these surfaces, aligned in one or more radial planes, serve as reference surfaces necessary for accurately positioning the oil pan relative to the carrier cheek or planetary gearbox during assembly.

[0023] In addition, it is optionally provided that one of the connecting elements protrudes axially from the respective platform on the side facing the carrier cheek, i.e., preferably integrally formed with the platform. The advantage of this design feature lies in the fact that, due to the corresponding design of the platform, the radial spacing of the connecting elements is independent or only partially dependent on the radial dimensions of the support plate or channel. If necessary, the platform with the connecting elements can protrude radially beyond the outer contour of the oil pan. Thus, the platform forms a radial extension from which the connecting elements protrude. The distance between the attachment points (connecting elements) of the oil pan can be adjusted to the design of the carrier cheek via the dimensions of the platform, regardless of the position of the actual oil guide. Additionally, due to the invention, the dimensions of the hub and the joining zone, as well as the distance between the oil pans, can be advantageously adjusted or adapted to each other, taking into account the requirements.

[0024] In addition, it is optionally provided that each protrusion is designed as a rib connected to the respective platform and channel. On the one hand, the ribs can be easily engaged during assembly, and on the other hand, the ribs form a reinforcement of the fixed structure. The latter is useful when, for example, the connecting element is pressed or snapped into the connecting hole under pressure during assembly of the oil pan to the carrier cheek.

[0025] One embodiment of the present invention provides that a removable or non-removable snap-on connection between the planet carrier and the oil pan is realized by means of connecting holes and connecting elements. The connecting elements are, for example, designed as snap hooks or have an expansion design like a dowel. Such an arrangement can be easily produced, especially when the oil pan is made from plastic. Corresponding undercuts are formed in the connecting holes for hooking the snap hooks or expansion dowels, or hooks or expansion elements reach axially through the respective connecting holes and hook on the opposite side, gripping behind the wall or wall section of the carrier cheek.

[0026] Each oil guide nozzle, which may be one, some or all of the oil guide nozzles in the oil pan, engages with one of the oil bores in the planet pin, which usually extend axially in the planet pin and are designed as through or blind holes. A transverse bore leads from each oil bore to at least one planet bearing for at least one planet gear.

[0027] In the following, the invention will be explained in more detail with reference to exemplary embodiments. [Brief explanation of the drawings]

[0028] [Figure 1] The planetary gearbox 15 is shown in longitudinal section along the axis of rotation 8. The axis of rotation 8 is considered to be axially aligned regardless of its actual orientation in space. Radial means transverse to the axis of rotation 8. [Figure 2] The shaft 4 of the planet carrier assembly 1 shown in FIG. 5, installed in the planetary gearbox 15 shown in FIG. 1, is shown partly as individual parts in a longitudinal section along the axis of rotation 8. [Figure 3] Illustrated is a first carrier cheek 2 from a planet carrier assembly 1 shown in FIG. 5 as an individual part. [Figure 4]The second carrier cheek 12 from the planet carrier assembly 1 shown in Figure 5 as an individual part is shown. [Figure 5] The planet carrier assembly 1 is shown in longitudinal section along the axis of rotation 8. [Figure 6] 6 shows a general view of the oil pan 19 arranged on the opposite side of the second shaft section 24 of the shaft 4 of the planet carrier assembly 1 shown in FIG. 5. DETAILED DESCRIPTION OF THE INVENTION

[0029] FIG. 1 - The planetary gearbox 15 consists of a planet carrier assembly 1, planet gears 16, planet pins 17, planet bearings 18, and an oil pan 19. Each of the planet gears 16 is rotatably mounted on a planet pin 17 with a planet bearing 18. Each of the planet pins 17 is supported in the first carrier cheek 2 on the right and in the second carrier cheek 12 on the left. The planet pins 17 are each provided with a blind hole 20, from which a transverse bore 21 leads to the respective planet bearing 18. The oil pans 19 are arranged laterally on the first carrier cheek 2 and in each case engage an oil guide nozzle 22 axially in one blind hole 20.

[0030] 1 and 5 - Planet carrier assembly 1 is formed from a first carrier cheek 2, a second carrier cheek 12, and a shaft 4. The first carrier cheek 2 is substantially coupled to a hub 11, and the first carrier cheek 2 and the second carrier cheek 12 are substantially coupled to each other.

[0031] FIG. 2 - The shaft 4 (shown only as a cutout in FIG. 2) is made in one piece and from one material from steel, consisting of two shaft sections 23, 24 and a hub 11. The hub 11 is located axially between the first shaft section 23 and the second shaft section 24 and extends around the rotation axis 8. The hub 11 protrudes radially from the two shaft sections 23 and 24. The shaft section 23 on the left side of the drawing has a diameter that is smaller in two stages compared to the diameter of the shaft section 24 on the right side of the drawing. The hub 11 has an outer cylindrical guide surface 6 on its outer circumferential side and an axial stop 7. The axial stop 7 is axially directly adjacent to the guide surface 6 and protrudes radially from the outer cylindrical guide surface 6. The abutment surface 25 formed on the axial stop 7 is directly contiguous with the guide surface 6. The abutment surface 25 is an annular surface located in an imaginary radial plane EE, through which the rotation axis 8 passes perpendicularly. Alternatively, instead of an annular surface, multiple individual axial stop surfaces or points on the axial stop may be formed in the same radial plane or in imaginary radial planes that are axially offset from one another.

[0032] FIG. 3 - The first carrier cheek 2 is a component made of sheet metal and manufactured by cold forming, for example by drawing and / or embossing and stamping. The carrier cheek 2 has first webs 26 uniformly distributed relative to one another on a circumference about an axis of symmetry, which is located on the axis of rotation 8 of the shaft within the mounted planet carrier assembly 1. Due to the cross-sectional view according to FIG. 3, only two of the webs 26 are visible: one in cross section and one viewed radially from the inside. The carrier cheek 2 is provided with axial through-holes, which are holders 9. The holders 9 are provided for guiding and seating on the guide surfaces 6 (see FIG. 5). The carrier cheek 2 is provided with bolt bearings 27 corresponding to the number of planet pins to be installed in the planetary gearbox 15 (see FIG. 1). The pin bearings 27 are axial through-holes. Due to the cross-sectional view, only one of the pin bearings 27 is visible in FIG. 3. The carrier cheek 2 is also provided with further through-holes 28, which may for example be introduced for technical reasons and / or used to attach an oil pan (see Figures 5 and 6). In this exemplary embodiment, three bolt bearings 27 and three through-holes 28 are provided, although due to the cross-section only one is visible.

[0033] 4 - The shape of the carrier cheek 12 essentially corresponds to the carrier cheek 2 shown in FIG. 3. The carrier cheek 12 also has three webs 26, a pin bearing 27, and through holes 28. However, the central through hole 29 of the carrier cheek 12 has a larger diameter than the holder 9 of the carrier cheek 2 (see FIG. 3). Due to the cross-sectional view according to FIG. 4, only two of the webs 26 are visible, one in cross section and one viewed radially from the inside. In this exemplary embodiment, three bolt bearings 27 and three through holes 28 are provided, but due to the cross-sectional view, only one is visible.

[0034] 5 - The first carrier cheek 2 is radially supported on the guiding surface 6 via the inner contour of the holder 9 and is centered on the rotation axis 8 of the shaft 4. The first carrier cheek 2 and the shaft 4 are at least substantially connected to each other in a first joining zone 5. The first carrier cheek 2 and the shaft 4 are in axial contact with each other in the joining zone 5 and are substantially connected to each other in the first joining zone 5, which is formed axially between the first carrier cheek 2 and an axial stop 7 extending around the rotation axis 8. The first joining zone 5 is formed axially between the carrier cheek 2 and the joining surface 25 and lies in a radial plane EE, which the rotation axis 8 passes through perpendicularly.

[0035] The shaft 4 and the first carrier cheek 2 are essentially joined to one another in the first joining zone 5 by a first weld seam 10 designed as a V-seam. The V-seam extends to a radial depth in a radial direction perpendicular to the rotation axis 8 and extends around the rotation axis 8 on the outer circumferential side. The result is a fully welded seam, where, at the depth of the joint or abutment, a zone free of material bond remains radially between the tip of the V and the guide surface 6, on which the carrier cheek 2 and the stop 7 rest axially against one another.

[0036] The first carrier cheek 2 and the second carrier cheek 12 rest axially on one another via a web 26. The planet bearings 27 are concentrically aligned with one another on the axis A. The first carrier cheek 2 is connected to the second carrier cheek 12 in a second joining zone 13 by at least one second weld seam 14. The second joining zone 13, and therefore the second weld seam 14, is formed axially between the carrier cheeks 2 and 12. In the case of this full weld seam, the weld seam extends radially in depth over only a portion of the adjoining part (joining zone).

[0037] 6 shows the oil pan 19 in an aligned position in preparation for assembly with the shaft 4, for example, of the planet carrier assembly 1 shown in FIG. 5. The oil pan 19 comprises a support plate 30, a channel 31, oil guide nozzles 22, and a connecting element 32. The channel 31 allows a plurality of platforms 33 to be formed in one piece from a single plastic material and to project radially beyond the outer contour 40 of the channel 31 in the radial direction, i.e., in the direction transverse to the axis of symmetry or rotation 8. The connecting element 32 projects axially on one side of each platform 33, and a protrusion 34 projects axially from the surface 35 of the platform 33 on the other side. Each protrusion 34 is designed in the form of a gusset plate, which is made in one piece from a single material and whose radial root 36 is fused to the surface 35 and whose axial root 37 is fused to the channel 31, also in one piece from a single material. The connecting element 32 is a plug connector with a snap function and has snap lugs 39 for this purpose.

[0038] 1 - The support plate 30 of the oil pan 19 rests axially on the end face 38 of the first carrier cheek 2, into whose blind holes 20 the oil guide nozzles 22 are inserted. The oil pan 19 is fixed to the support component 2 by means of the connecting elements 32 so that the connecting elements 32 pass axially through the respective through-holes 28 formed in the wall of the carrier cheek 2 and the snap-in lugs 39 reach axially or radially rearward on the side of the carrier cheek 2 facing away from the oil pan 19. The first carrier cheek 2 and the second carrier cheek 12 rest axially on one another via the web 26. The first carrier cheek 2 is connected to the second carrier cheek 12 in a second joining zone 13 by at least one second weld seam 14. The second joining zone 13, and therefore the second weld seam 14, is formed axially between the carrier cheeks 2 and 12. [Explanation of symbols]

[0039] 1 Planet Carrier Assembly 2. First Career Cheek 3 Planet carrier 4 shafts 5. First joining zone (between carrier cheek and shaft) 6 Guide surface on shaft 7 Axial stop on shaft 8 Shaft rotation axis 9 Carrier Cheek Holder 10 Welded Seam 11. Hub 12 Second Career Cheek 13 Second Joint Zone 14 Second welding seam 15 Planetary Gearbox 16 Planetary Gear 17 Planetary pin 18 Planetary bearings 19 Oil pan 20 Blind hole 21 Crossbore 22 Oil guide nozzle in oil pan 23 First Shaft Section 24 Second Shaft Section 25 Joint surface 26 Web 27 pin bearing 28 Through Hole 29 Through holes 30 Support Plate 31 channels 32 connection elements 33 Platform 34 Protrusion 35 Surface 36 Radial root 37 Axial root 38 End face 39 Snap Nose 40 Outer contour

Claims

1. A planet carrier assembly (1) comprising at least one first carrier cheek (2) of a planet carrier (3) and at least one shaft (4), the shaft (4) being provided with at least one guide surface (6) and at least one axial stop (7) axially adjacent to the guide surface (6), a holder (9) of the first carrier cheek (2) being radially supported on the guide surface (6) and centered on an axially aligned rotation axis (8) of the shaft (4), the first carrier cheek (2) and the shaft (4) being substantially connected to each other at a first joining zone (5) formed between the axial stop (7) and the first carrier cheek (2) in the axial direction, the axial stop (7) is provided with at least one abutment surface (25), which faces the first carrier cheek (2) and extends radially outwardly away from the rotation axis (8) and at least partially around the circumference of the abutment surface (25), and the first abutment zone (5) is formed axially between the first carrier cheek (2) and the abutment surface (25), the shaft (4) and the first carrier cheek (2) are substantially joined to one another in the first joining zone (5) by a first welded seam (10) designed as a V-seam, the shaft is formed from a first shaft section (23), a second shaft section (24) and a hub (11) which are made together as one piece and from one material; the guide surface (6) and the axial stop (7) are formed on a hub (11), the hub (11) being axially located between a first shaft section (23) and a second shaft section (24) and oriented radially away from the rotation axis (8); The planet carrier assembly (1) is characterized in that the first shaft section (23) protrudes from the hub (11) in one axial direction so as to penetrate the planet carrier (3), and the second shaft section (24) protrudes from the hub (11) in the other axial direction.

2. Planet carrier assembly (1) according to claim 1, characterized in that said guide surface (6) extends circumferentially around said axis of rotation (8).

3. Planet carrier assembly (1) according to claim 1 or 2, characterized in that the guiding surface (6) has an external cylindrical surface at least in sections.

4. 2. A planet carrier assembly (1) according to claim 1, characterized in that the first carrier cheek (2) and the shaft (4) are made from different steel materials.

5. 5. A planet carrier assembly (1) according to any one of claims 1 to 4, characterized in that the first carrier cheek (2) is connected to the second carrier cheek (12) in a second joining zone (13) by at least one second weld seam (14), the second joining zone (13) and the second weld seam being formed at least partially axially between the carrier cheeks (2, 12).

6. the first carrier cheek (2) and the second carrier cheek (12) are designed as one and the same part; 6. A planet carrier assembly (1) according to claim 5, characterized in that the holder (9), configured as a cylindrical hole in the first carrier cheek (2) and concentric with the rotation axis (8), has an inner diameter different from or the same as a through hole (29) formed in the second carrier cheek (12) and concentric with the rotation axis (8).

7. A planetary carrier assembly (1) as described in any one of claims 1 to 6, wherein the first shaft section (23) has a diameter smaller than the diameter of the second shaft section (24).

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