Planetary transmission mechanism and wind power gear box

Abstract

The utility model belongs to the technical field of wind power equipment, and discloses a planetary transmission mechanism and a wind power gear box. The planetary transmission mechanism comprises a planet carrier, a planet wheel and a thrust sliding bearing, the planet carrier is provided with a mounting cavity, a mounting boss is arranged on the inner wall of the mounting cavity, and the planet wheel is arranged in the mounting cavity; the thrust sliding bearing comprises a bearing body and a connecting boss, the bearing body is arranged on the end face, facing the planet wheel, of the mounting boss, the end face, facing the planet wheel, of the bearing body is a working face, and a lubricating oil film is formed between the working face and the planet wheel; the connecting boss is connected to the side, away from the planet wheel, of the bearing body and used for being fixedly connected with the mounting boss. The mounting component is additionally arranged to reduce the hole structure of the working surface of the thrust sliding bearing of the planet wheel, so that a continuous lubricating oil film is more easily formed on the working surface of the thrust sliding bearing, and the bearing capacity of the thrust sliding bearing is ensured.

Description

Technical Field

[0001] This utility model relates to the field of wind power equipment technology, and in particular to a planetary transmission mechanism and a wind turbine gearbox. Background Technology

[0002] In the field of wind power equipment, wind turbine gearboxes play a vital role in transmitting the slow wind power to the generator for power generation.

[0003] In wind turbine gearboxes, the use of planetary sliding bearings is becoming increasingly common. Currently, due to space constraints and the rotational operation of the planetary carrier, the installation and fixing structure of thrust sliding bearings that bear the axial load of the planetary gears primarily involves multiple screws arranged circumferentially on the working surface of the thrust sliding bearing and secured with preload. However, machining multiple screw holes on the working surface reduces the effective area of ​​the working surface and is detrimental to the continuity of the oil film. Furthermore, because the material of thrust sliding bearings has low hardness and is sensitive to temperature changes, it has a significant impact on screw preload, which can easily lead to screw preload failure and bearing damage over time.

[0004] Therefore, there is an urgent need for a planetary transmission mechanism and a wind turbine gearbox to solve the above-mentioned technical problems. Utility Model Content

[0005] One objective of this invention is to provide a planetary transmission mechanism that can be separately equipped with mounting components to reduce the hole structure of the working surface of the thrust sliding bearing of the planetary gear, making it easier for a continuous lubricating oil film to form on the working surface of the thrust sliding bearing, thereby ensuring the load-bearing capacity of the thrust sliding bearing.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Planetary transmission mechanism, including:

[0008] The planetary carrier has a mounting cavity, and a mounting boss is provided on the inner wall of the mounting cavity;

[0009] Planetary gears are disposed within the aforementioned mounting cavity;

[0010] A thrust sliding bearing includes a bearing body and a connecting boss. The bearing body is disposed on the end face of the mounting boss facing the planetary gear. The end face of the bearing body facing the planetary gear is a working surface. The working surface is used to form a lubricating oil film between the bearing body and the planetary gear. The connecting boss is connected to the side of the bearing body away from the planetary gear and is used to fix it to the mounting boss.

[0011] Optionally, the connecting boss is connected to the inner circumferential surface of the bearing body, and the connecting boss is used to fix the connection with the inner circumferential surface of the mounting boss.

[0012] Alternatively, the connecting boss is connected to the outer peripheral surface of the bearing body, and the connecting boss is used to fix it to the outer peripheral surface of the mounting boss.

[0013] Optionally, the connecting boss is a continuous annular boss structure;

[0014] Alternatively, the connecting boss may include a plurality of protruding structures, which are spaced apart circumferentially along the bearing body.

[0015] Optionally, the thrust sliding bearing is an integral structure; or, the thrust sliding bearing is a split structure, wherein the bearing body includes at least two connected bearing half-rings.

[0016] Optionally, it also includes multiple fasteners. One of the connecting boss and the mounting boss is provided with multiple connecting holes spaced apart along its circumference, and the other is provided with multiple threaded holes spaced apart along its circumference. The multiple connecting holes and the multiple threaded holes are provided in a one-to-one correspondence. The multiple fasteners are passed through the multiple connecting holes and threadedly connected to the corresponding threaded holes.

[0017] Optionally, it also includes multiple stop pins. The connecting boss is provided with multiple connecting grooves located on the inner side of the connecting boss at intervals along its circumference. The stop pins are fixedly connected to the mounting boss, and the multiple stop pins are slidably connected to the multiple connecting grooves one by one.

[0018] Optionally, the connecting groove includes a waist-shaped groove and a radial groove. The waist-shaped groove extends circumferentially along the connecting boss, and one end of the radial groove is connected to the waist-shaped groove, while the other end is connected to the end face of the connecting boss away from the bearing body.

[0019] Optionally, it also includes a pin, which is disposed on the planetary carrier, the planetary gear is sleeved on the outer periphery of the pin, the thrust sliding bearing is disposed on the mounting boss of the planetary carrier, and the working surface of the thrust sliding bearing is disposed facing the end face of the planetary gear.

[0020] Optionally, two thrust sliding bearings are provided, and the two thrust sliding bearings are respectively disposed between the two end faces of the planetary gear along its own axial direction and the planet carrier.

[0021] Another objective of this invention is to provide a wind turbine gearbox that can be additionally equipped with mounting components to reduce the hole structure of the working surface of the thrust sliding bearing of the planetary gear, making it easier for a continuous lubricating oil film to form on the working surface of the thrust sliding bearing, thereby ensuring the load-bearing capacity of the thrust sliding bearing.

[0022] To achieve this objective, the present invention adopts the following technical solution:

[0023] A wind turbine gearbox includes a housing and the aforementioned planetary transmission mechanism, wherein the planetary transmission mechanism is disposed within the housing.

[0024] The beneficial effects of this utility model are:

[0025] This invention provides a planetary transmission mechanism and a wind turbine gearbox. By additionally providing a connecting boss for fixed connection with the mounting boss of the planetary carrier, it avoids placing the connecting structure of the thrust sliding bearing on the working surface of the thrust sliding bearing structure. This increases the effective area for oil film formation on the working surface, making it easier for a continuous lubricating oil film to form on the working surface of the thrust sliding bearing of the planetary gears. This ensures the axial load-bearing capacity of the thrust sliding bearing on the planetary gears and avoids damage to the bearing body caused by fixing it to an external structure, thus extending the service life of the thrust sliding bearing. Simultaneously, changing the connecting structure of the planetary carrier from the main stress area to the mounting boss eliminates fixed connections in the main stress area of ​​the planetary carrier, ensuring the structural strength of the planetary carrier. Attached Figure Description

[0026] Figure 1 This is a cross-section of the planetary transmission mechanism provided in a specific embodiment of this utility model. Figure 1 ;

[0027] Figure 2 This is a cross-section of the planetary transmission mechanism provided in a specific embodiment of this utility model. Figure 2 ;

[0028] Figure 3 This is a cross-section of the planetary transmission mechanism provided in a specific embodiment of this utility model. Figure 3 ;

[0029] Figure 4 This is a cross-section of the planetary transmission mechanism provided in a specific embodiment of this utility model. Figure 4 ;

[0030] Figure 5 This is a cross-section of the planetary transmission mechanism provided in a specific embodiment of this utility model. Figure 5 ;

[0031] Figure 6 The isometric view of the thrust sliding bearing provided in the specific embodiment of this utility model Figure 1 ;

[0032] Figure 7 The isometric view of the thrust sliding bearing provided in the specific embodiment of this utility model Figure 2 ;

[0033] Figure 8 The isometric view of the thrust sliding bearing provided in the specific embodiment of this utility model Figure 3 ;

[0034] Figure 9 yes Figure 1 A magnified view of a section at point A in the middle;

[0035] Figure 10 yes Figure 2 A magnified view of a section at point B in the middle;

[0036] Figure 11 yes Figure 3 A magnified view of a section at point C.

[0037] In the picture:

[0038] 1. Thrust sliding bearing; 2. Planetary carrier; 201. Mounting boss; 3. Planetary gear; 4. Pin; 5. Radial sliding bearing; 6. Threaded hole; 7. Connecting hole; 8. Fastener; 9. Stop pin;

[0039] 110. Bearing body; 111. Working surface;

[0040] 120. Connecting boss; 121. Connecting groove; 1211. Waist-shaped groove; 1212. Radial groove. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0042] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between 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.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] In the description of this embodiment, the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0045] The following reference Figures 1 to 11 This invention introduces the planetary transmission mechanism and wind turbine gearbox provided by this utility model.

[0046] Please refer to Figures 1 to 8 This embodiment provides a planetary transmission mechanism, which includes a planet carrier 2, planet gears 3, and a thrust sliding bearing 1. The planet carrier 2 has a mounting cavity, and a mounting boss 201 is provided on the inner wall of the mounting cavity. The planet gears 3 are disposed in the mounting cavity, and the thrust sliding bearing 1 is disposed between the planet carrier 2 and the planet gears 3 to achieve axial load bearing on the planet gears 3. The thrust sliding bearing 1 includes a bearing body 110 and a connecting boss 120. The bearing body 110 is disposed on the end face of the mounting boss 201 facing the planet gears 3, and the end face of the bearing body 110 facing the planet gears 3 is a working surface 111, which is used to form a lubricating oil film between itself and the planet gears 3. The connecting boss 120 is connected to the side of the bearing body 110 away from the planet gears 3, and the connecting boss 120 is used for fixed connection with the mounting boss 201.

[0047] In this embodiment, the planetary transmission mechanism uses a connecting boss 120 outside the bearing body 110 of the thrust sliding bearing 1 to be fixedly connected to the mounting boss 201 of the planetary carrier 2. This avoids placing the connecting structure of the thrust sliding bearing 1 on the working surface 111 of the thrust sliding bearing 1, increasing the effective area for forming an oil film on the working surface 111. This makes it easier for a continuous lubricating oil film to form on the working surface 111 of the thrust sliding bearing 1, ensuring the axial load-bearing capacity of the thrust sliding bearing 1 on the planetary gear 3, and avoiding damage to the bearing body 110 caused by fixing it to an external structure, thus improving the service life of the thrust sliding bearing 1 and even the planetary transmission mechanism. At the same time, changing the connecting structure of the planetary carrier 2 from the main stress area to the mounting boss 201 eliminates the fixed connection on the main stress area of ​​the planetary carrier 2, ensuring the structural strength of the planetary carrier 2.

[0048] Specifically, there are two thrust sliding bearings 1, which are respectively disposed between the two end faces of the planetary gear 3 along its own axial direction and the planet carrier 2, and are used to carry axial load on both end faces of the planetary gear 3 along its axial direction, so as to improve the axial load capacity of the planetary gear 3.

[0049] Please refer to Figure 6 , Figure 7 , Figure 9 and Figure 10 Optionally, the connecting boss 120 can be disposed on the outer or inner circumference of the bearing body 110, both of which can achieve a fixed connection to the mounting boss 201 of the planetary carrier 2. Specifically, in one optional embodiment, the connecting boss 120 is connected to the inner circumferential surface of the bearing body 110, and the connecting boss 120 is used for a fixed connection with the inner circumferential surface of the mounting boss 201; in another optional embodiment, the connecting boss 120 is connected to the outer circumferential surface of the bearing body 110, and the connecting boss 120 is used for a fixed connection with the outer circumferential surface of the mounting boss 201. Regardless of whether the connecting boss 120 is disposed on the outer or inner circumference of the bearing body 110, it does not affect the working surface 111 of the bearing body 110, thus enabling the formation of a continuous oil film on the working surface 111.

[0050] Since multiple mounting positions are generally provided between the connecting boss 120 and the mounting boss 201, the connecting boss 120 can optionally be a ring structure or have multiple fixing structures provided at intervals, both of which can realize the installation of the connecting boss 120 and the mounting boss 201.

[0051] In an optional embodiment, the connecting boss 120 is a continuous annular boss structure; this configuration increases the contact area between the thrust sliding bearing 1 and the planetary carrier 2, thereby also improving the installation stability of the thrust sliding bearing 1.

[0052] Please refer to Figure 4 and Figure 5 Optionally, when the connecting boss 120 is a continuous ring structure, the connecting boss 120 can be a circular ring structure, an irregular ring structure, or a polygonal ring structure, all of which are within the protection scope of this utility model and are not specifically limited here.

[0053] In another alternative embodiment, the connecting boss 120 includes a plurality of protruding structures spaced apart circumferentially along the bearing body 110. These structures can also be connected to the mounting boss 201, simplifying the structure and reducing the weight of the thrust sliding bearing 1.

[0054] Optionally, the protruding structure can be an arc-shaped structure, a polygonal structure, or an irregular structure, all of which are within the protection scope of this utility model and are not specifically limited herein.

[0055] Similarly, the mounting boss 201 can be a continuous ring structure or multiple fixed structures spaced apart, both of which can achieve the installation of the connecting boss 120 and the mounting boss 201.

[0056] In an optional embodiment, a mounting boss 201 is provided, and the mounting boss 201 is a ring structure; this configuration increases the contact area between the thrust sliding bearing 1 and the planetary carrier 2, thereby also improving the installation stability of the thrust sliding bearing 1.

[0057] In another alternative embodiment, the mounting boss 201 includes a plurality of protrusions corresponding to the connecting boss 120, the plurality of protrusions being spaced apart circumferentially along the planetary carrier 2. This also enables connection with the connecting boss 120, simplifies the structure, and reduces the weight of the thrust sliding bearing 1.

[0058] It should be noted that the shape of the annular structure and the shape of the protrusion of the mounting boss 201 can be referenced to the shape of the annular structure and the shape of the protrusion of the connecting boss 120, and will not be described again here.

[0059] Optionally, the thrust sliding bearing 1 is an integral structure; or the thrust sliding bearing 1 is a split structure, with the bearing body 110 including at least two connected bearing half-rings. That is, the thrust sliding bearing 1 can be a single ring structure or assembled from at least two half-ring structures. Both structures can be matched with corresponding connecting bosses 120 to ensure the applicability of the thrust sliding bearing 1.

[0060] For example, the thrust sliding bearing 1 has a split structure, so that if the thrust sliding bearing 1 needs to be replaced or disassembled during use, it is not necessary to disassemble the planetary gear 3 first, which simplifies the time and difficulty of disassembly and maintenance.

[0061] Specifically, the fixed connection between the connecting boss 120 and the mounting boss 201 can be achieved by bolt fixing, slip ring fixing, etc., and no specific limitation is made here.

[0062] Please refer to Figure 6 , Figure 7 , Figure 9 and Figure 10 In an optional embodiment, the planetary transmission mechanism further includes a plurality of fasteners 8. One of the connecting boss 120 and the mounting boss 201 has a plurality of connecting holes 7 spaced apart along its circumference, and the other has a plurality of threaded holes 6 spaced apart along its circumference. The plurality of connecting holes 7 and the plurality of threaded holes 6 are arranged in a one-to-one correspondence. The plurality of fasteners 8 are respectively inserted through the plurality of connecting holes 7 and threadedly connected to the corresponding threaded holes 6. This achieves a fixed connection between the connecting boss 120 and the mounting boss 201.

[0063] For example, in this embodiment, such as Figure 6 and Figure 9As shown, when the connecting boss 120 is located on the inner circumferential surface of the bearing body 110, the connecting boss 120 is connected to the inner circumferential surface of the mounting boss 201. At this time, the connecting boss 120 has a threaded hole 6, and the mounting boss 201 has a connecting hole 7, so that the fastener 8 can be installed from the outside, facilitating installation by operators. Figure 7 and Figure 10 As shown, when the connecting boss 120 is set on the outer peripheral surface of the bearing body 110, the connecting boss 120 is connected to the outer peripheral surface of the mounting boss 201. At this time, the connecting boss 120 is provided with a connecting hole 7, and the mounting boss 201 is provided with a threaded hole 6, so that the fastener 8 can be installed from the outside, which is convenient for the operator's installation work.

[0064] It should be noted that the number of fasteners 8, connecting holes 7 and threaded holes 6 can be adapted to the size of the thrust sliding bearing 1 and the working conditions, and no specific limit is made here.

[0065] Alternatively, the fastener 8 can be any bolt, stud, screw, or other structure with external threads, all of which can achieve a threaded connection with the threaded hole 6.

[0066] like Figure 8 and Figure 11 As shown, in another optional embodiment, the planetary transmission mechanism further includes multiple stop pins 9. The connecting boss 120 has multiple connecting grooves 121 recessed at intervals along its circumference on its inner side. The stop pins 9 are fixedly connected to the mounting boss 201, specifically by having pin holes in the mounting boss 201, with the stop pins 9 fixedly connected within the pin holes. Multiple stop pins 9 are slidably connected to the multiple connecting grooves 121 in a one-to-one correspondence. After each stop pin 9 slides into its corresponding connecting groove 121, the connecting boss 120 and the mounting boss 201 can be connected in a limited manner. Furthermore, it also provides a limiting function for the planet carrier 2 and the planetary gear 3 in the axial direction, thus also achieving the fixation of the thrust sliding bearing 1 and allowing it to swing slightly in the circumferential direction, compensating for part errors during the manufacturing process.

[0067] Specifically, the connecting groove 121 includes a waist-shaped groove 1211 and a radial groove 1212. The waist-shaped groove 1211 extends circumferentially along the connecting boss 120. One end of the radial groove 1212 is connected to the waist-shaped groove 1211, and the other end is connected to the end face of the connecting boss 120 away from the bearing body 110. That is, during installation, each radial groove 1212 is correspondingly set with each stop pin 9 fixedly connected in the pin hole opened in the mounting boss 201 and slidably connected until the stop pin 9 slides into the waist-shaped groove 1211 to realize the installation of the connecting boss 120.

[0068] Furthermore, the planetary transmission mechanism also includes a pin 4, which is mounted on the planet carrier 2. The planet gear 3 is sleeved on the outer periphery of the pin 4. The thrust sliding bearing 1 is mounted on the mounting boss 201 of the planet carrier 2, and the working surface 111 of the thrust sliding bearing 1 faces the end face of the planet gear 3, thus enabling the installation of the planet gear 3.

[0069] Furthermore, the wind turbine gearbox is also equipped with a radial sliding bearing 5, which is located on the outer periphery of the pin 4 and forms a lubricating oil film with the inner circumferential surface of the planetary gear 3 for radial bearing of the planetary gear 3.

[0070] Furthermore, the wind turbine gearbox is also provided with a lubrication oil passage, which is connected between the working surface 111 of the thrust sliding bearing 1 and the planetary gear 3. In addition, the lubrication oil passage is also connected between the inner circumferential surface of the radial sliding bearing 5 and the planetary gear 3, for supplying lubricating oil to the two bearings to achieve the formation of a lubricating oil film.

[0071] Please refer to Figures 1 to 3 This embodiment also provides a wind turbine gearbox, which includes a housing and a planetary transmission mechanism as described in any of the above embodiments, the planetary transmission mechanism being disposed on the housing. By using this planetary transmission mechanism, the effective working area of ​​the working surface 111 of the thrust sliding bearing 1 is increased, the continuity of the lubricating oil film is improved, and the axial load-bearing capacity of the thrust sliding bearing 1 on the planetary gear 3 is ensured.

[0072] 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 various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments 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 transmission mechanism, characterized by, The application relates to a thrust sliding bearing (1) and a planet carrier (2) for a planetary gear. The planet carrier (2) comprises a mounting cavity, and a mounting boss (201) is arranged on the inner wall of the mounting cavity. The thrust sliding bearing (1) comprises a bearing body (110) and a connecting boss (120), the bearing body (110) is arranged on the end face of the mounting boss (201) facing the planet wheel (3), the end face of the bearing body (110) facing the planet wheel (3) is a working face (111) for forming a lubricating oil film with the planet wheel (3), and the connecting boss (120) is connected to the side of the bearing body (110) away from the planet wheel (3) and is used for being fixedly connected with the mounting boss (201). The connecting boss (120) is connected to the inner circumferential surface of the bearing body (110), and is used for being fixedly connected with the inner circumferential surface of the mounting boss (201).

2. The planetary transmission mechanism according to claim 1, characterized in that, Or, the connecting boss (120) is connected to the outer circumferential surface of the bearing body (110), and is used for being fixedly connected with the outer circumferential surface of the mounting boss (201). The connecting boss (120) is a continuous annular boss structure.

3. The planetary transmission mechanism according to claim 1, characterized in that, Or, the connecting boss (120) comprises a plurality of protruding structures which are arranged at intervals along the circumference of the bearing body (110). The thrust sliding bearing (1) is of an integrated structure, or the thrust sliding bearing (1) is of a split structure, and the bearing body (110) comprises at least two connected bearing half-rings.

4. The planetary transmission mechanism according to claim 1, characterized in that, A plurality of fasteners (8) are further arranged, one of the connecting boss (120) and the mounting boss (201) is provided with a plurality of connecting holes (7) at intervals along the circumference thereof, the other is provided with a plurality of threaded holes (6) at intervals along the circumference thereof, the plurality of connecting holes (7) and the plurality of threaded holes (6) are arranged in one-to-one correspondence, and the plurality of fasteners (8) are arranged in one-to-one correspondence in the plurality of connecting holes (7) and are threadedly connected with the corresponding threaded holes (6).

5. The planetary transmission mechanism according to any one of claims 1 to 4, characterized in that, A plurality of stop pins (9) are further arranged, the connecting boss (120) is provided with a plurality of connecting grooves (121) on the inner side surface of the connecting boss (120) at intervals along the circumference thereof, the stop pins (9) are fixedly connected to the mounting boss (201), and the plurality of stop pins (9) are arranged in one-to-one correspondence and are slidably connected to the plurality of connecting grooves (121).

6. A planetary transmission mechanism according to any one of claims 1-4, characterized in that The connecting groove (121) comprises a waist-shaped groove (1211) and a radial groove (1212), the waist-shaped groove (1211) is arranged in extension along the circumference of the connecting boss (120), and one end of the radial groove (1212) is communicated with the waist-shaped groove (1211) and the other end is communicated with the end face of the connecting boss (120) away from the bearing body (110).

7. A planetary transmission mechanism according to claim 6, characterised in that, ​ 8. The planetary transmission mechanism of claim 1, wherein Further comprising a pin shaft (4) arranged on the planet carrier (2), the planet wheel (3) is sleeved on the outer periphery of the pin shaft (4), the thrust sliding bearing (1) is arranged on the mounting boss (201) of the planet carrier (2), and the working surface (111) of the thrust sliding bearing (1) is arranged towards the end surface of the planet wheel (3).

9. The planetary transmission mechanism of claim 1, wherein The thrust sliding bearing (1) is provided with two, and the two thrust sliding bearings (1) are arranged between the two end faces of the planet wheel (3) along the axial direction thereof and the planet carrier (2) respectively.

10. A wind turbine gearbox, characterised in that It comprises a box body and the planetary transmission mechanism as claimed in any one of claims 1-9, and the planetary transmission mechanism is arranged in the box body.

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