Planetary gear transmission and vehicle
By incorporating limiting components, including washers and rolling elements, into the planetary gear transmission, the vibration and wear problems caused by axial movement of the gear ring are resolved, resulting in lower friction and less wear, and improved operational stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-23
- Publication Date
- 2026-03-13
AI Technical Summary
In existing planetary gear transmissions, the gear ring is suspended inside the housing. When the driving and driven plates come into contact, the gear ring will move axially, causing vibration and abnormal noise, and accelerating the wear of the housing and the gear ring.
A limiting component, including a washer and a rolling element, is provided between the gear ring and the housing. The gear ring is fixed to the washer, and the rolling element rotates at intervals along the circumference of the washer to limit the axial movement of the gear ring, replacing rolling friction to reduce friction.
It effectively limits the movement of the gear ring, reduces friction, reduces vibration and abnormal noise of the planetary gear transmission at high speeds, and extends the service life of the limiting components and the gear ring.
Smart Images
Figure CN223991952U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of vehicle technology, and in particular to planetary gear transmissions and vehicles. Background Technology
[0002] Planetary gear transmissions are efficient and compact transmission devices widely used in the automotive, construction machinery, and aerospace industries. Their core structure consists of a sun gear, planet gears, a ring gear, and a planet carrier, achieving multi-speed changes through the fixing or linkage of different components.
[0003] like Figure 1 As shown, in the prior art, a planetary gear transmission typically includes a housing 1, a planetary gear assembly disposed within the housing 1, a driving plate 41, and a driven plate 42. The driving plate 41 is typically fixed on the housing 1 or the planet carrier 24 (planetary gear set support structure) and connected to a pressure plate controlled by a hydraulic system or a solenoid valve. The driven plate 42 is mounted on the gear ring 21 and is arranged alternately with the driving plate 41. The driving plate 41 and the driven plate 42 are pressed together or separated by the pressure plate controlled by the hydraulic system or a solenoid valve, thereby realizing the transmission or interruption of power.
[0004] However, the gear ring 21 is usually suspended inside the housing 1. When the driving plate 41 and the driven plate 42 are pressed together, the gear ring 21 will move axially, which will cause the gear ring 21 to come into contact with the housing 1. When the planetary gear transmission is running at high speed, it is easy to generate vibration and abnormal noise, and accelerate the wear of the housing 1 and the gear ring 21.
[0005] Therefore, planetary gear transmissions are urgently needed to solve the above problems. Utility Model Content
[0006] The purpose of this utility model is to provide a planetary gear transmission and vehicle to solve the problem in the related technology that the gear ring is usually suspended in the housing. When the driving plate and the driven plate are pressed together, the gear ring will move axially, which will cause the gear ring to come into contact with the housing. Under high-speed operation, the planetary gear transmission is prone to vibration and abnormal noise, and accelerates the wear of the housing and the gear ring.
[0007] On one hand, this utility model provides a planetary gear transmission, which includes:
[0008] A housing, wherein the housing is provided with a mounting cavity;
[0009] A planetary gear assembly is disposed within the mounting cavity. The planetary gear assembly includes a gear ring. Along the axial direction of the gear ring, gaps are respectively provided between the two ends of the gear ring and the housing. The gear ring is floating relative to the housing along the axial direction of the gear ring.
[0010] A limiting component is disposed within the gap at one end or both ends of the gear ring. The limiting component includes a washer and rolling elements. One of the gear ring and the housing is fixedly connected to the corresponding washer, and the washer is coaxially opposite to the gear ring. A plurality of rolling elements are circumferentially spaced and rotatably disposed on the washer, and the plurality of rolling elements abut against the other of the gear ring and the housing.
[0011] As a preferred technical solution for a planetary gear transmission, the washer is provided with multiple rolling grooves around its circumference, and multiple rolling elements are respectively disposed in the rolling grooves.
[0012] As a preferred technical solution for a planetary gear transmission, the limiting assembly further includes a retainer, which is fixed to the washer and restricts the rolling element from dislodging from the rolling groove.
[0013] As a preferred technical solution for a planetary gear transmission, the cage is annular and coaxially fixed to one end of the washer where the rolling groove is provided. The cage is provided with a plurality of retaining holes at intervals around the circumference of the washer, and the plurality of retaining holes correspond one-to-one with the plurality of rolling grooves. The rolling element extends out of the retaining hole and abuts against the gear ring and another one of the housing.
[0014] Along the axial direction of the retaining hole, the cross-sectional area of the end of the retaining hole away from the washer is smaller than the maximum cross-sectional area of the rolling element.
[0015] As a preferred technical solution for a planetary gear transmission, the washer is fixed to the housing, and the retainer is located at the end of the washer away from the housing.
[0016] As a preferred technical solution for a planetary gear transmission, the limiting assembly further includes a plurality of bolts, which are circumferentially spaced around the washer, and the bolts pass through the housing and are screwed to the washer and the cage.
[0017] As a preferred technical solution for a planetary gear transmission, the washer is provided with a first lubricating oil passage, one end of which is located on the radial sidewall of the washer, and the other end of which is located within the rolling groove.
[0018] As a preferred technical solution for a planetary gear transmission, the planetary gear assembly includes a sun gear, planet gears, a ring gear, a sun gear shaft, and a planet gear shaft. Each of the sun gear, planet gears, ring gear, sun gear shaft, and planet gear shaft is provided with a second lubrication passage. The second lubrication passage can deliver lubricating oil to the outer surfaces of the sun gear, planet gears, ring gear, sun gear shaft, and planet gear shaft.
[0019] As a preferred technical solution for a planetary gear transmission, it also includes a clutch plate assembly, which includes a driving plate, a driven plate, and a driving member. One of the driving plate and the driven plate is disposed in the housing, and the other is disposed in the gear ring. The driving member drives the driving plate to undergo elastic deformation along the axial direction of the gear ring, so that the driving plate and the driven plate abut against each other. One end of the gear ring along the axial direction is close to the housing.
[0020] The limiting component is disposed between one end of the gear ring and the housing.
[0021] On the other hand, the present invention provides a vehicle including a planetary gear transmission as described in any of the above embodiments.
[0022] The beneficial effects of this utility model are as follows:
[0023] This utility model provides a planetary gear transmission and a vehicle. The planetary gear transmission includes a housing, a planetary gear assembly, and a limiting assembly. The housing has a mounting cavity. The planetary gear assembly is disposed in the mounting cavity and includes a gear ring. Along the axial direction of the gear ring, gaps are respectively provided between the two ends of the gear ring and the housing. The gear ring is floating relative to the housing along the axial direction of the gear ring. The limiting assembly is disposed in the gap at one end or the gap at both ends of the gear ring. The limiting assembly includes a washer and rolling elements. One of the gear ring and the housing is fixedly connected to the corresponding washer, and the washer and the gear ring are coaxially opposite each other. Multiple rolling elements are circumferentially spaced and rotatably disposed on the washer, and multiple rolling elements abut against another of the gear ring and the housing. When the planetary gear transmission is operating, the ring gear floats relative to the housing along its own axis. While rotating around its own axis, it may also move relative to the housing along its own axis. To limit this movement, a limiting component is installed in the gap between one or both ends of the ring gear along its own axis. This limiting component fills the gap between the ring gear and the housing, thus restricting the ring gear's movement along its own axis. Since the ring gear rotates around its own axis, to reduce friction between the ring gear and the limiting component, the limiting component includes washers and rolling elements. One of the ring gear and the housing is fixed to the corresponding washer. Multiple rolling elements are circumferentially spaced and rotatably mounted on the washer, and abut against another of the ring gear and the housing. This replaces the traditional sliding friction between the ring gear and the housing with rolling friction between the ring gear and the limiting component. In summary, by setting the limiting component, not only is the axial movement of the gear ring restricted, but the friction between the gear ring and the limiting component is also significantly reduced. Under high-speed operation, the planetary gear transmission reduces vibration and abnormal noise, and reduces wear between the limiting component and the gear ring. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the structure of a planetary gear transmission in the prior art;
[0025] Figure 2 This is a schematic diagram of the planetary gear transmission in an embodiment of the present invention;
[0026] Figure 3 This is a cross-sectional view of the limiting component in an embodiment of the present utility model;
[0027] Figure 4 This is a schematic diagram of the gasket structure in an embodiment of this utility model.
[0028] In the picture:
[0029] 1. Shell; 11. Body; 12. Cover; 121. Through hole;
[0030] 21. Gear ring; 22. Sun gear; 23. Planet gears; 24. Planet carrier; 25. Sun gear shaft; 26. Planet gear shaft;
[0031] 3. Limiting assembly; 31. Washer; 311. Rolling groove; 312. First threaded hole; 32. Rolling element; 33. Cage; 331. Retaining hole; 332. Second threaded hole; 34. Bolt;
[0032] 4. Clutch plate assembly; 41. Driving plate; 42. Driven plate; 43. Driven component;
[0033] 5. Connecting disk. Detailed Implementation
[0034] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0035] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0037] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0038] like Figures 2-4 As shown, this embodiment provides a planetary gear transmission, which includes a housing 1, a planetary gear assembly, and a limiting component 3. The housing 1 is provided with a mounting cavity. The planetary gear assembly is disposed in the mounting cavity and includes a gear ring 21. Along the axial direction of the gear ring 21, there are gaps between the two ends of the gear ring 21 and the housing 1. The gear ring 21 is floating relative to the housing 1 along the axial direction of the gear ring 21. The limiting component 3 is disposed in the gap at one end or the gap at both ends of the gear ring 21. The limiting component 3 includes a washer 31 and rolling elements 32. One of the gear ring 21 and the housing 1 is fixedly connected to the corresponding washer 31, and the washer 31 is coaxially arranged opposite to the gear ring 21. A plurality of rolling elements 32 are spaced apart circumferentially along the washer 31 and rotatably disposed on the washer 31. A plurality of rolling elements 32 abut against the other of the gear ring 21 and the housing 1. When the planetary gear transmission is working, the ring gear 21 is floating relative to the housing 1 along its own axis. When the planetary gear set is working, the ring gear 21 will rotate around its own axis and may also move relative to the housing 1 along its own axis. In order to limit the movement of the ring gear 21 relative to the housing 1 along its own axis, a limiting component 3 is provided in the gap at one or both ends of the ring gear 21 along its own axis. The limiting component 3 fills the gap between the ring gear 21 and the housing 1 along its own axis, thereby limiting the movement of the ring gear 21 along its own axis. Since the gear ring 21 rotates around its own axis, in order to reduce the friction between the gear ring 21 and the limiting component 3, the limiting component 3 includes a washer 31 and rolling elements 32. One of the gear ring 21 and the housing 1 is fixedly connected to the corresponding washer 31. Multiple rolling elements 32 are circumferentially spaced and rotatably disposed on the washer 31, and multiple rolling elements 32 abut against the other of the gear ring 21 and the housing 1. This replaces the traditional sliding friction between the gear ring 21 and the housing 1 with rolling friction between the gear ring 21 and the limiting component 3. In summary, by setting the limiting component 3, not only is the axial movement of the gear ring 21 restricted, but the friction between the gear ring 21 and the limiting component 3 is also significantly reduced. Under high-speed operation, the planetary gear transmission reduces vibration and abnormal noise, and reduces wear between the limiting component 3 and the gear ring 21.
[0039] Optionally, the housing 1 includes a body 11 and a cover 12. The body is provided with an open mounting cavity, and the cover 12 is fixedly connected to the body to close the open. The planetary gear assembly and the limiting assembly 3 are both disposed in the mounting cavity from the open.
[0040] Optionally, the planetary gear assembly also includes a sun gear 22, planet gears 23, a ring gear 21, and a planet carrier 24, with the planet carrier 24 being connected to the connecting disc 5 to transmit power to the next stage gear set.
[0041] Regarding how the rolling elements 32 are rotatably mounted on the washer 31, optionally, the washer 31 is provided with a plurality of rolling grooves 311 around its circumference, and the plurality of rolling elements 32 are correspondingly disposed within the rolling grooves 311. In this embodiment, the rolling elements 32 can rotate within the rolling grooves 311. The rolling elements 32 are balls. In other embodiments, the rolling elements 32 can also be rollers, with the rolling axis of the roller coinciding with the radial direction of the washer 31.
[0042] Regarding how the rolling element 32 is rotatably mounted on the washer 31, in other embodiments, the washer 31 is provided with a rolling recess around the circumference of the washer 31, and the rolling element 32 is disposed within the rolling recess.
[0043] Optionally, the limiting component 3 further includes a retainer 33, which is fixed to the washer 31 and restricts the rolling element 32 from dislodging from the rolling groove 311. In this embodiment, since the toothed ring 21 floats relative to the housing 1 along its own axis, the gap distance between the toothed ring 21 and the housing 1 along its own axis will change. When the gap distance along the axial direction of the toothed ring 21 is greater than the distance of the rolling element 32 along the axial direction of the toothed ring 21, the toothed ring 21 is more likely to dislodge from the rolling groove 311. Therefore, by providing a retainer 33 on the washer 31, the rolling element 32 can be prevented from dislodging from the rolling groove 311.
[0044] Optionally, the retainer 33 is annular and coaxially fixed to one end of the washer 31 where the rolling groove 311 is provided. The retainer 33 has multiple retaining holes 331 spaced circumferentially around the washer 31, each corresponding to a rolling groove 311. A portion of the rolling element 32 extends out of the retaining hole 331 and abuts against another part of the gear ring 21 and housing 1. Along the axial direction of the retaining hole 331, the cross-sectional area of the end of the retaining hole 331 away from the washer 31 is smaller than the maximum cross-sectional area of the rolling element 32. In this embodiment, the retainer 33 is annular and attached to the side of the washer 31 where the rolling groove 311 is provided. The retaining holes 331 and the corresponding rolling grooves 311 on the retainer 33 form a cavity adapted to the rolling element 32. After the rolling element 32 is placed in this cavity, a portion of the rolling element 32 extends out of the retaining hole 331, and the rolling element 32 can roll within the cavity. Specifically, along the axial direction of the retaining hole 331, the cross-sectional area of the end of the retaining hole 331 away from the washer 31 is smaller than the maximum cross-sectional area of the rolling element 32 located in the cavity. This arrangement can prevent the rolling element 32 from coming out of the retaining hole 331.
[0045] Optionally, the washer 31 is fixed to the housing 1, and the retainer 33 is located at the end of the washer 31 away from the housing 1. In this embodiment, the washer 31 is disposed on the cover 12, which facilitates the maintenance and replacement of the limiting component 3.
[0046] Optionally, the limiting component 3 further includes a plurality of bolts 34, which are spaced apart circumferentially around the washer 31. The bolts 34 pass through the housing 1 and are screwed to the washer 31 and the retainer 33. In this embodiment, the cover 12 has a plurality of through holes 121 spaced apart circumferentially along the washer 31, the washer 31 has a plurality of first threaded holes 312, and the retainer 33 has a plurality of second threaded holes 332. The plurality of bolts 34, the plurality of through holes 121, the plurality of first threaded holes 312, and the plurality of second threaded holes 332 correspond one-to-one. The bolts 34 pass through the through holes 121, the first threaded holes 312, and the second threaded holes 332 and are screwed to the washer 31 and the retainer 33, thereby fixing the cover 12, the washer 31, and the retainer 33. In other embodiments, the bolts 34 may pass through the housing 1 and the washer 31, and then be screwed to the retainer 33.
[0047] Optionally, the washer 31 is provided with a first lubricating oil passage. One end of the first lubricating oil passage is located on the radial sidewall of the washer 31, and the other end is located in the rolling groove 311. In this embodiment, the mounting cavity is usually provided with lubricating oil. When the planetary gear transmission is working, the lubricating oil in the mounting cavity will splash. When the lubricating oil splashes onto the radial sidewall of the washer 31, it can then enter the rolling groove 311 through the first lubricating oil passage, thereby achieving lubrication between the washer 31, the cage 33, and the rolling element 32. Some of the lubricating oil can also splash directly onto the rolling element 32.
[0048] Optionally, the planetary gear assembly also includes a sun gear shaft 25 and a planetary gear shaft 26. The sun gear 22, planetary gears 23, ring gear 21, sun gear shaft 25, and planetary gear shaft 26 are all provided with a second lubrication path. This second lubrication path can deliver lubricating oil to the outer surfaces of the sun gear 22, planetary gears 23, ring gear 21, sun gear shaft 25, and planetary gear shaft 26. In this embodiment, the second lubrication path is used to deliver lubricating oil from the mounting cavity to the outer surfaces of the planetary gear assembly, thereby lubricating the planetary gear assembly. Simultaneously, since the outer surfaces of the sun gear 22, planetary gears 23, ring gear 21, sun gear shaft 25, and planetary gear shaft 26 are all lubricated, when the planetary gear assembly is working, lubricating oil will splash onto the limiting component 3, thereby achieving lubrication between the washer 31, cage 33, and rolling element 32. A portion of the lubricating oil can also directly splash onto the rolling element 32.
[0049] Optionally, the planetary gear transmission further includes a clutch plate assembly 4, which includes a driving plate 41, a driven plate 42, and a driving member 43. One of the driving plate 41 and the driven plate 42 is disposed on the housing 1, and the other is disposed on the gear ring 21. The driving member 43 drives the driving plate 41 to elastically deform along the axial direction of the gear ring 21, so that the driving plate 41 and the driven plate 42 abut against each other. One end of the gear ring 21 along the axial direction is close to the housing 1. The limiting component 3 is disposed between one end of the gear ring 21 and the housing 1. In this embodiment, taking the sun gear 22 as the driving gear as an example, when the sun gear 22 rotates, the driving member 43 drives the driving plate 41 to deform, so that the driving plate 41 and the driven plate 42 abut against each other, thereby fixing the gear ring 21 and the housing 1 relatively, and the sun gear 22 can then transmit power to the planet carrier 24. During this process, while the driving component 43 drives the active plate 41 to deform, it also drives one end of the gear ring 21 along the axial direction of the gear ring 21 to approach the housing 1. Then, a limiting component 3 is set between the one end of the gear ring 21 along the axial direction of the gear ring 21 and the housing 1, which on the one hand restricts the movement of the gear ring 21, and on the other hand reduces the wear of the gear ring 21.
[0050] Optionally, the drive element 43 is a hydraulic actuator; in other embodiments, it may also be an electromagnetic actuator or a pneumatic actuator.
[0051] This embodiment also provides a vehicle, including the planetary gear transmission described above.
[0052] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A planetary gear variator characterised in that, The application relates to a shell (1) provided with a mounting cavity; a planetary gear assembly arranged in the mounting cavity, the planetary gear assembly comprising a ring gear (21), gaps being respectively arranged between both ends of the ring gear (21) and the shell (1) along the axial direction of the ring gear (21), and the ring gear (21) being arranged in a floating mode relative to the shell (1) along the axial direction of the ring gear (21); and a limiting assembly (3) arranged in the gap at one end of the ring gear (21) or in the gaps at both ends of the ring gear (21), the limiting assembly (3) comprising a washer (31) and rolling bodies (32), one of the ring gear (21) and the shell (1) being fixedly connected with the corresponding washer (31), the washer (31) being arranged in a coaxial mode relative to the ring gear (21), and the rolling bodies (32) being arranged in a rotating mode in the washer (31) along the circumferential direction of the washer (31) and abutting against the other one of the ring gear (21) and the shell (1). The washer (31) is provided with rolling grooves (311) along the circumferential direction of the washer (31), and the rolling bodies (32) are arranged in the rolling grooves (311) in a one-to-one mode. The limiting assembly (3) further comprises a retainer (33) fixedly arranged on the washer (31) and limiting the rolling bodies (32) from being pulled out of the rolling grooves (311). The retainer (33) is annular, is coaxially arranged on one end of the washer (31) provided with the rolling grooves (311), is arranged in a spaced mode along the circumferential direction of the washer (31), is provided with retainer holes (331) in a one-to-one mode corresponding to the rolling grooves (311), and the rolling bodies (32) partially extend out of the retainer holes (331) and abut against the other one of the ring gear (21) and the shell (1).
2. The planetary gear variator of claim 1, wherein, The cross-sectional area of the retainer holes (331) away from one end of the washer (31) is smaller than the maximum cross-sectional area of the rolling bodies (32) along the axial direction of the retainer holes (331).
3. The planetary gear variator of claim 2, wherein, The washer (31) is fixedly arranged on the shell (1), and the retainer (33) is located on one end of the washer (31) away from the shell (1).
4. The planetary gear variator of claim 3, wherein, The limiting assembly (3) further comprises a plurality of bolts (34) arranged in a spaced mode along the circumferential direction of the washer (31), the bolts (34) penetrating through the shell (1) and being screwed with the washer (31) and the retainer (33). The washer (31) is provided with a first lubricating oil path, one end of the first lubricating oil path being located on the side wall of the washer (31) along the radial direction, and the other end of the first lubricating oil path being located in the rolling grooves (311).
5. The planetary gear variator of claim 3 wherein, 6. The planetary gear variator of claim 5, wherein, 7. The planetary gear variator of claim 2 wherein, 8. The planetary gear variator of claim 1, wherein, The planetary wheel assembly comprises a sun gear (22), a planetary gear (23), a ring gear (21), a sun gear rotating shaft (25) and a planetary gear rotating shaft (26), and the sun gear (22), the planetary gear (23), the ring gear (21), the sun gear rotating shaft (25) and the planetary gear rotating shaft (26) are all provided with a second lubricating oil path, which can cause lubricating oil to flow to the outer surfaces of the sun gear (22), the planetary gear (23), the ring gear (21), the sun gear rotating shaft (25) and the planetary gear rotating shaft (26).
9. A planetary gear variator according to any one of claims 1-8, characterised in that, Further comprising a clutch plate set (4), the clutch plate set (4) comprises a driving plate (41), a driven plate (42) and a driving member (43), one of the driving plate (41) and the driven plate (42) is arranged on the housing (1), and the other is arranged on the ring gear (21), the driving member (43) drives the driving plate (41) to elastically deform along the axial direction of the ring gear (21), so that the driving plate (41) and the driven plate (42) abut against each other, and one end of the ring gear (21) along the axial direction of the ring gear (21) is close to the housing (1); The limiting assembly (3) is arranged between one end of the ring gear (21) and the housing (1).
10. Vehicle, characterized in that The planetary gear transmission comprises the planetary gear transmission according to any one of claims 1-9.