Concentric double-shaft differential double-screw feeding device based on planetary transmission

Abstract

The invention relates to the technical field of feeding machines, in particular to a concentric double-shaft differential double-screw feeding device based on planetary transmission. The speed reducer comprises an output outer shaft and an output inner shaft, the output outer shaft is internally provided with a front-back through inner shaft mounting cavity, the output inner shaft is arranged in the inner shaft mounting cavity, the output outer shaft and the output inner shaft are in running fit through a first bearing structure, and the output outer shaft and the output inner shaft are coaxially arranged; the output end of the output inner shaft is connected with a blade screw through threads, the output end of the output outer shaft is connected with a spring screw through threads, the blade screw is located on the inner ring of the spring screw, and a gap is reserved between the blade screw and the spring screw. The inner and outer double-shaft material conveying structure composed of the blade screw and the spring screw can prevent conveyed materials from being extruded, and stable feeding is achieved; the cross section of the conveying structure formed by the blade screws and the spring screws is round, and compared with a traditional kidney-shaped double-blade screw conveying structure, the feeding yield is improved.

Description

Technical Field

[0001] The invention relates to the technical field of feeders, in particular to a concentric double-shaft differential-speed twin-screw feeding device based on planetary transmission. Background Art

[0002] A loss-in-weight feeder is a device that adds quantitative ingredients into the equipment according to a program, and is widely used in the field of automatic batching production. The screw is an important feeding component on a loss-in-weight scale. Most of the screws of this type in the prior art have a fixed structure, mainly double-meshing screws, double-blade screws, single-blade screws, and spring screws. Due to different industries, the materials conveyed will vary greatly. When the screw of a loss-in-weight feeder conveys a high-viscosity granular powder mixture, there will be unevenness and powder sticking to the screw, resulting in no discharge. In the prior art, in order to achieve uniform feeding of powder, a double-blade screw is generally used to convey materials. However, the double-blade screw has the disadvantages of material extrusion and low output. Summary of the invention

[0003] In view of the shortcomings of the above-mentioned existing production technology, the present application provides a concentric twin-axis differential twin-screw feeding device based on planetary transmission. The inner and outer twin-axis material conveying structure composed of a blade screw and a spring screw can avoid extrusion of the conveyed material, achieve stable feeding, and improve feeding output; at the same time, it can realize the feeding of particle powder mixture.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A concentric double-shaft differential double-screw feeding device based on planetary transmission comprises an output outer shaft and an output inner shaft, wherein an inner shaft mounting cavity which passes through from front to back is arranged in the output outer shaft, and the output inner shaft is arranged in the inner shaft mounting cavity, the output outer shaft and the output inner shaft are rotationally matched through a first bearing structure, and the output outer shaft and the output inner shaft are coaxially arranged; the output end of the output inner shaft is connected to a blade screw through a thread, and the output end of the output outer shaft is connected to a spring screw through a thread, the blade screw is located in the inner ring of the spring screw, and a gap is left between the blade screw and the spring screw; a screw mounting piece is sleeved on the outer ring of the output outer shaft, and the screw mounting piece and the output outer shaft are rotationally matched through a second bearing structure; the input ends of the output inner shaft and the output outer shaft are connected to a double-shaft differential transmission mechanism together, and the double-shaft differential transmission mechanism can drive the output inner shaft and the output outer shaft to rotate in the same direction at a differential speed.

[0006] Furthermore, the end of the blade screw is connected to the blade via a fixing bolt.

[0007] Furthermore, the first bearing structure includes two groups of first bearing groups arranged in the inner shaft mounting cavity in a front-to-back manner, each group of first bearing groups includes a number of first bearings arranged side by side, a plurality of first spacer rings are arranged side by side between the two groups of first bearing groups, a first retaining ring is arranged on the left side of the first bearing group arranged on the left side, the first retaining ring is clamped in the groove on the side wall of the inner shaft mounting cavity, the first retaining ring plays a side positioning role for the first bearing group on the left side, and the first bearing group on the right side is side positioned by the shoulder side wall of the output inner shaft.

[0008] Furthermore, the cross section of the conveying structure formed by the blade screw and the spring screw is circular.

[0009] Furthermore, the spring screw includes a screw mounting portion and a coil spring portion, one end of the coil spring portion is fixedly connected to the screw mounting portion, and the other end of the coil spring portion is suspended, and the screw mounting portion is connected to the external thread section of the output outer shaft through an internal thread.

[0010] Furthermore, the blade screw comprises a screw body, and spiral blades are arranged on the side of the screw body along the length direction.

[0011] Furthermore, the second bearing structure includes two groups of second bearing groups arranged on the outer ring of the output outer shaft in front and back, each group of second bearing groups includes a number of second bearings arranged side by side, and a plurality of second spacer rings are arranged side by side between the two groups of second bearing groups. A second retaining ring is arranged on the left side of the second bearing group arranged on the left side, and the second retaining ring is clamped in the groove on the inner wall of the screw mounting component. The second retaining ring plays a side positioning role for the second bearing group on the left side, and the second bearing group on the right side is side positioned by the shoulder side wall of the output outer shaft.

[0012] Furthermore, the dual-axis differential transmission mechanism includes a planetary carrier shaft, the output end of the planetary carrier shaft and the input end of the output outer shaft are snap-connected into one body, the input end of the planetary carrier shaft is connected to one end of the coupling, and the other end of the coupling is connected to the driving end of the driving motor. The outer ring of the planetary carrier shaft is sleeved with an inner gear sleeve, and the inner gear sleeve and the planetary carrier shaft are rotatably matched through a third bearing structure. The side surface of the inner gear sleeve is detachably connected by a connecting screw mounting piece through a connecting piece, and the inner gear ring is fixed to the inner ring side wall of the inner gear sleeve. Three planetary gear mounting cavities are arranged in the planetary carrier shaft, and the three planetary gear mounting cavities are evenly distributed along the same circumference. A planetary gear is rotatably connected in each planetary gear mounting cavity, and the inner gear ring is located at the outer rings of the three planetary gears and is meshed with the three planetary gears. The input end of the output inner shaft is clamped with the sun output gear through a keyway, and the sun output gear is located at the inner rings of the three planetary gears and is meshed with the three planetary gears.

[0013] Furthermore, a plurality of straight inner flat grooves are arranged at the input end of the output outer shaft, and the plurality of inner flat grooves are evenly distributed along the circumferential direction; a snap-in hole is arranged at the output end of the planetary carrier shaft, and a plurality of straight outer flat grooves are arranged on the inner wall of the snap-in hole, and the plurality of outer flat grooves are evenly distributed along the circumferential direction; the plurality of inner flat grooves of the output outer shaft can correspond one-to-one with the plurality of outer flat grooves of the planetary carrier shaft in an interference fit, thereby realizing a snap-in connection between the output outer shaft and the planetary carrier shaft.

[0014] Furthermore, the third bearing structure includes two groups of third bearing groups arranged on the planetary carrier shaft in front and behind, each group of third bearing groups includes at least one third bearing, at least one third spacer ring is arranged between the two groups of third bearing groups, a third retaining ring is arranged on the left side of the third bearing group arranged on the left, the third retaining ring is clamped in the groove on the inner wall of the inner gear sleeve, and the right side of the third bearing group arranged on the right side is side-positioned by the shoulder side wall of the planetary carrier shaft.

[0015] The beneficial effects of the present invention are as follows:

[0016] The inner and outer double-axis material conveying structure composed of the blade screw and the spring screw of the present invention can avoid squeezing the conveyed material and realize stable feeding; the cross-section of the conveying structure composed of the blade screw and the spring screw is circular, which improves the feeding output compared with the traditional waist-shaped double-blade screw conveying structure; the present invention realizes the same-direction differential rotation of the spring screw and the blade screw by a set of driving transmission mechanism. Under the same-direction differential rotation of the spring screw and the blade screw, the conveyed granular powder mixture with relatively large viscosity is not easy to stick to the spring screw and the blade screw, and the feeding of the granular powder mixture can be realized; the blades at the end of the blade screw of the present invention can make the material discharge evenly, and at the same time can break up the larger volume of material blocks and feed them out in batches, so as to improve the feeding stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a stereogram of the present invention.

[0018] Figure 2 It is a front view half-section view of the present invention.

[0019] Figure 3 The schematic diagram of the structure of the first bearing, the second bearing and the third bearing of the present invention is

[0020] Figure 4 It is a three-dimensional diagram of the blade screw of the present invention.

[0021] Figure 5 It is a structural diagram of the spring screw of the present invention.

[0022] Figure 6 It is a schematic diagram of the connection between the planet carrier shaft and the output outer shaft of the present invention.

[0023] Figure 7 It is a schematic diagram of the structure of the internal gear sleeve of the present invention.

[0024] Figure 8 It is a schematic diagram of the planet carrier shaft structure of the present invention.

[0025] Fig. 9 It is a schematic diagram of the planetary transmission structure of the present invention.

[0026] Fig.10 It is a schematic diagram of the output inner shaft structure of the present invention.

[0027] Among them: 1. Coupling; 2. Internal gear sleeve; 3. Screw mounting; 4. Output outer shaft; 4.1. Internal flat groove; 5. Output inner shaft; 6. Planet carrier shaft; 6.1. External flat groove; 7. Planetary gear; 8. Sun output gear; 9. Spring screw; 9.1. Screw mounting part; 9.2. Helical spring part; 10. Blade screw; 10.1. Screw body; 10.2. Helical blade; 11. Fixing bolt; 12. Blade; 13. Third bearing; 14. First bearing; 15. First spacer; 16. First retaining ring; 17. Second bearing; 18. Second spacer; 19. Second retaining ring; 20. First sealing ring; 21. Second sealing ring; 22. Third spacer; 23. Third retaining ring; 24. Internal gear ring. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0029] like Figure 1 and Figure 2 As shown, a concentric double-shaft differential twin-screw feeding device based on planetary transmission includes an output outer shaft 4 and an output inner shaft 5. The output outer shaft 4 is provided with an inner shaft installation cavity that passes through from front to back, and the inner shaft installation cavity is provided with the output inner shaft 5. The output outer shaft 4 and the output inner shaft 5 are rotationally matched through a first bearing structure, and the output outer shaft 4 and the output inner shaft 5 are coaxially arranged.

[0030] like Figure 3 As shown, the first bearing structure includes two groups of first bearing groups arranged in the inner shaft installation cavity in front and back, each group of first bearing groups includes a plurality of first bearings 14 arranged side by side, and a plurality of first spacers 15 are arranged side by side between the two groups of first bearing groups. A first retaining ring 16 is arranged on the left side of the first bearing group arranged on the left side, and the first retaining ring 16 is clamped in the clamping groove on the side wall of the inner shaft installation cavity. The first retaining ring 16 plays a side positioning role for the first bearing group on the left side, and the first bearing group on the right side is formed by the shoulder side wall of the output inner shaft 5 to form a side positioning.

[0031] like Figure 1 and Figure 2As shown, the output end of the output inner shaft 5 is connected to the blade screw 10 through a thread, and the end of the blade screw 10 is connected to the blade 12 through a fixing bolt 11. The blade 12 at the end of the blade screw 10 can make the material uniformly discharged, and at the same time can break up the large volume of material blocks and feed them out in batches to improve the feeding stability. The output end of the output outer shaft 4 is connected to the spring screw 9 through a thread, and the blade screw 10 is located in the inner circle of the spring screw 9. There is a gap between the blade screw 10 and the spring screw 9, and the gap is a channel for material transportation. When the material is transported through the gap between the blade screw 10 and the spring screw 9, the material will not be squeezed, and the original state and integrity of the transported material can be effectively guaranteed. The cross section of the conveying structure formed by the blade screw 10 and the spring screw 9 is circular, and the cross section of the traditional double-blade screw conveying structure is waist-shaped. In the same space, the circular conveying cross section of the blade screw 10 and the spring screw 9 has a larger output.

[0032] like Figure 5 As shown, the spring screw 9 includes a screw mounting portion 9.1 and a spiral spring portion 9.2, one end of the spiral spring portion 9.2 is fixedly connected to the screw mounting portion 9.1, and the other end of the spiral spring portion 9.2 is suspended. The screw mounting portion 9.1 is connected to the external thread section of the output outer shaft 4 through an internal thread.

[0033] like Figure 4 As shown, the blade screw 10 comprises a screw body 10.1, and spiral blades 10.2 are arranged on the side of the screw body 10.1 along the length direction.

[0034] like Figure 1 and Figure 2 As shown, the outer ring of the output outer shaft 4 is sleeved with a screw mounting member 3, and the screw mounting member 3 and the output outer shaft 4 are rotatably matched through a second bearing structure. When applied to a loss-in-weight feeder, the screw mounting member 3 can be connected to a loss-in-weight scale.

[0035] like Figure 3 As shown, the second bearing structure includes two groups of second bearing groups arranged front and back on the outer ring of the output outer shaft 4, each group of second bearing groups includes a plurality of second bearings 17 arranged side by side, and a plurality of second spacers 18 are arranged side by side between the two groups of second bearing groups. A second retaining ring 19 is arranged on the left side of the second bearing group arranged on the left side, and the second retaining ring 19 is clamped in the inner wall groove of the screw mounting member 3. The second retaining ring 19 plays a side positioning role for the second bearing group on the left side, and the second bearing group on the right side is formed by the shoulder side wall of the output outer shaft 4. As shown Figure 3 As shown, a first sealing ring 20 is arranged between the screw mounting member 3 and the output outer shaft 4 . The first sealing ring 20 is located in a groove on the inner wall of the screw mounting member 3 . The first sealing ring 20 can achieve sealing between the screw mounting member 3 and the output outer shaft 4 .

[0036] like Figure 1 and Figure 2 As shown, the input ends of the output inner shaft 5 and the output outer shaft 4 are commonly connected to a dual-axis differential transmission mechanism, and the dual-axis differential transmission mechanism can drive the output inner shaft 5 and the output outer shaft 4 to rotate in the same direction at a differential speed.

[0037] like Figure 3 As shown, a second sealing ring 21 is arranged between the output end of the output outer shaft 4 and the output inner shaft 5 . The second sealing ring 21 is located in a groove on the inner wall of the output outer shaft 4 . The second sealing ring 21 can achieve sealing between the output end of the output outer shaft 4 and the output inner shaft 5 .

[0038] like Figure 2 and Figure 6 As shown, the dual-axis differential transmission mechanism includes a planetary carrier shaft 6, and the output end of the planetary carrier shaft 6 and the input end of the output outer shaft 4 are snap-connected into one. The input end of the planetary carrier shaft 6 is connected to one end of the coupling 1, and the other end of the coupling 1 is connected to the driving end of the drive motor. The outer ring of the planetary carrier shaft 6 is sleeved with an inner gear sleeve 2, and the inner gear sleeve 2 and the planetary carrier shaft 6 are rotatably matched through a third bearing structure. The side of the inner gear sleeve 2 is detachably connected by a connecting screw mounting member 3.

[0039] like Figure 6 As shown, the input end of the output outer shaft 4 is provided with a plurality of straight inner flat grooves 4.1, and the plurality of inner flat grooves 4.1 are evenly distributed along the circumferential direction. The output end of the planetary carrier shaft 6 is provided with a snap-in hole, and the inner wall of the snap-in hole is provided with a plurality of straight outer flat grooves 6.1, and the plurality of outer flat grooves 6.1 are evenly distributed along the circumferential direction. The plurality of inner flat grooves 4.1 of the output outer shaft 4 can be interference-fitted with the plurality of outer flat grooves 6.1 of the planetary carrier shaft 6 in a one-to-one correspondence, so as to realize the snap-in connection between the output outer shaft 4 and the planetary carrier shaft 6.

[0040] like Figure 7 and Figure 8 As shown, the inner ring side wall of the inner gear sleeve 2 is fixed with an inner gear ring 24. Three planetary gear mounting cavities are arranged in the planet carrier shaft 6, and the three planetary gear mounting cavities are evenly distributed along the same circumference. A planetary gear 7 is rotatably connected in each planetary gear mounting cavity, and the inner gear ring 24 is located at the outer rings of the three planetary gears 7 and meshes with the three planetary gears 7.

[0041] like Fig. 9 and Fig.10 As shown, the input end of the output inner shaft 5 is engaged with the sun output gear 8 through a keyway. The sun output gear 8 is located on the inner rings of the three planetary gears 7 and is meshed with the three planetary gears 7 .

[0042] During operation, the motor drives the planetary carrier shaft 6 to rotate through the coupling 1, and the planetary carrier shaft 6 drives the output outer shaft 4 connected thereto to rotate in the same direction and at the same speed, and the output outer shaft 4 drives the spring screw 9 to rotate in the same direction and at the same speed. The planetary carrier shaft 6, the planetary gear 7, and the sun output gear 8 form a planetary transmission structure, and the planetary carrier shaft 6 drives the sun output gear 8 to rotate through the planetary transmission structure, thereby driving the output inner shaft 5 and the blade screw 10 to accelerate in the same direction. Finally, a set of driving transmission mechanisms realizes the same-direction differential rotation of the spring screw 9 and the blade screw 10. Under the same-direction differential rotation of the spring screw 9 and the blade screw 10, the granular powder mixture with a large viscosity is not easy to stick to the spring screw 9 and the blade screw 10.

[0043] like Figure 3 As shown, the third bearing structure includes two third bearing groups arranged on the planetary carrier shaft 6 in front and back, each third bearing group includes at least one third bearing 13, and at least one third spacer 22 is arranged between the two third bearing groups. A third retaining ring 23 is arranged on the left side of the third bearing group arranged on the left side, and the third retaining ring 23 is clamped in the inner wall groove of the inner gear sleeve 2, and the right side of the third bearing group arranged on the right side is formed by the shoulder side wall of the planetary carrier shaft 6 to form a side positioning.

[0044] The inner and outer double-axis material conveying structure composed of the blade screw and the spring screw of the present invention can avoid squeezing the conveyed material and realize stable feeding; the cross-section of the conveying structure composed of the blade screw and the spring screw is circular, which improves the feeding output compared with the traditional waist-shaped double-blade screw conveying structure; the present invention realizes the same-direction differential rotation of the spring screw and the blade screw by a set of driving transmission mechanism. Under the same-direction differential rotation of the spring screw and the blade screw, the conveyed granular powder mixture with relatively large viscosity is not easy to stick to the spring screw and the blade screw, and the feeding of the granular powder mixture can be realized; the blades at the end of the blade screw of the present invention can make the material discharge evenly, and at the same time can break up the larger volume of material blocks and feed them out in batches, so as to improve the feeding stability.

Claims

1. A concentric twin-shaft differential twin-screw feeding device based on planetary transmission, comprising an output outer shaft (4) and an output inner shaft (5), characterized in that: The output outer shaft (4) is provided with an inner shaft installation cavity which is through-through from front to back, and the output inner shaft (5) is provided in the inner shaft installation cavity, the output outer shaft (4) and the output inner shaft (5) are rotationally matched through a first bearing structure, and the output outer shaft (4) and the output inner shaft (5) are coaxially arranged; the output end of the output inner shaft (5) is connected to a blade screw (10) through a thread, and the output end of the output outer shaft (4) is connected to a spring screw (9) through a thread, the blade screw (10) is located in the inner ring of the spring screw (9), and a gap is left between the blade screw (10) and the spring screw (9); the outer ring of the output outer shaft (4) is sleeved with a screw mounting member (3), and the screw mounting member (3) and the output outer shaft (4) are rotationally matched through a second bearing structure; the input ends of the output inner shaft (5) and the output outer shaft (4) are connected to a dual-axis differential transmission mechanism, and the dual-axis differential transmission mechanism can drive the output inner shaft (5) and the output outer shaft (4) to rotate in the same direction at a differential speed.

2. A concentric twin-shaft differential twin-screw feeding device based on planetary transmission as claimed in claim 1, characterized in that: The end of the blade screw (10) is connected to the blade (12) via a fixing bolt (11).

3. A concentric twin-shaft differential speed twin-screw feeding device based on planetary transmission as claimed in claim 1, characterized in that: The first bearing structure comprises two groups of first bearing groups arranged in the inner shaft installation cavity in a front-to-rear manner, each group of first bearing groups comprises a plurality of first bearings (14) arranged side by side, a plurality of first spacer rings (15) are arranged side by side between the two groups of first bearing groups, a first retaining ring (16) is arranged on the left side of the first bearing group arranged on the left side, the first retaining ring (16) is clamped in a clamping groove on the side wall of the inner shaft installation cavity, the first retaining ring (16) plays a side positioning role for the first bearing group on the left side, and the first bearing group on the right side is formed by the side wall of the output inner shaft (5) to form a side positioning.

4. A concentric twin-shaft differential speed twin-screw feeding device based on planetary transmission as claimed in claim 1, characterized in that: The cross section of the conveying structure formed by the blade screw (10) and the spring screw (9) is circular.

5. A concentric twin-shaft differential speed twin-screw feeding device based on planetary transmission as claimed in claim 1, characterized in that: The spring screw (9) comprises a screw mounting portion (9.1) and a coil spring portion (9.2); one end of the coil spring portion (9.2) is fixedly connected to the screw mounting portion (9.1), and the other end of the coil spring portion (9.2) is suspended; the screw mounting portion (9.1) is connected to the external thread section of the output outer shaft (4) via an internal thread.

6. A concentric twin-shaft differential speed twin-screw feeding device based on planetary transmission as claimed in claim 1, characterized in that: The blade screw (10) comprises a screw body (10.1), and spiral blades (10.2) are arranged on the side of the screw body (10.1) along the length direction.

7. A concentric twin-shaft differential speed twin-screw feeding device based on planetary transmission as claimed in claim 1, characterized in that: The second bearing structure comprises two groups of second bearing groups arranged front and back on the outer ring of the output outer shaft (4), each group of second bearing groups comprises a plurality of second bearings (17) arranged side by side, a plurality of second spacer rings (18) are arranged side by side between the two groups of second bearing groups, a second retaining ring (19) is arranged on the left side of the second bearing group arranged on the left side, the second retaining ring (19) is clamped in the inner wall groove of the screw mounting member (3), the second retaining ring (19) plays a side positioning role for the second bearing group on the left side, and the second bearing group on the right side is formed by the shoulder side wall of the output outer shaft (4) to form a side positioning.

8. A concentric twin-shaft differential speed twin-screw feeding device based on planetary transmission as claimed in claim 1, characterized in that: The dual-axis differential transmission mechanism comprises a planetary carrier shaft (6), the output end of the planetary carrier shaft (6) and the input end of the output outer shaft (4) are snap-connected to form an integral whole, the input end of the planetary carrier shaft (6) is connected to one end of a coupling (1), and the other end of the coupling (1) is connected to the driving end of a driving motor, an inner gear sleeve (2) is sleeved on the outer ring of the planetary carrier shaft (6), the inner gear sleeve (2) and the planetary carrier shaft (6) are rotationally matched through a third bearing structure, a detachable connecting screw mounting member (3) is provided on the side of the inner gear sleeve (2), and the inner gear sleeve (2) is provided with a connecting member. An inner gear ring (24) is fixed on the inner ring side wall, three planetary gear installation cavities are arranged in the planetary carrier shaft (6), the three planetary gear installation cavities are evenly distributed along the same circumference, a planetary gear (7) is rotatably connected in each planetary gear installation cavity, the inner gear ring (24) is located on the outer rings of the three planetary gears (7) and is meshed with the three planetary gears (7), the input end of the output inner shaft (5) is clamped with a sun output gear (8) through a keyway, and the sun output gear (8) is located on the inner rings of the three planetary gears (7) and is meshed with the three planetary gears (7).

9. A concentric twin-shaft differential-speed twin-screw feeding device based on planetary transmission as claimed in claim 8, characterized in that: The input end of the output outer shaft (4) is provided with a plurality of straight inner flat grooves (4.1), which are evenly distributed along the circumferential direction; the output end of the planetary carrier shaft (6) is provided with a snap-in hole, and the inner wall of the snap-in hole is provided with a plurality of straight outer flat grooves (6.1), which are evenly distributed along the circumferential direction; the plurality of inner flat grooves (4.1) of the output outer shaft (4) can be interference-fitted with the plurality of outer flat grooves (6.1) of the planetary carrier shaft (6) in a one-to-one correspondence, thereby realizing a snap-in connection between the output outer shaft (4) and the planetary carrier shaft (6).

10. A concentric dual-shaft differential speed twin-screw feeding device based on planetary transmission as claimed in claim 8, characterized in that: The third bearing structure comprises two third bearing groups arranged on the planetary carrier shaft (6) in a front-rear manner, each third bearing group comprising at least one third bearing (13), at least one third spacer ring (22) being arranged between the two third bearing groups, a third retaining ring (23) being arranged on the left side of the third bearing group arranged on the left side, the third retaining ring (23) being clamped in a clamping groove on the inner side wall of the inner gear sleeve (2), and a side positioning is formed on the right side of the third bearing group arranged on the right side by a shoulder side wall of the planetary carrier shaft (6).

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