Planetary gear speed reducer

Abstract

The utility model provides a planetary gear speed reducer. The planetary gear speed reducer comprises a planet carrier assembly, the planet carrier assembly comprises a planet carrier connecting rod, a planet wheel is rotationally connected outside the planet carrier connecting rod, a gear ring is meshed outside the planet wheel, a sun wheel is meshed inside the planet wheel, the sun wheel and the gear ring are coaxial, meshing teeth of the sun wheel, meshing teeth of the planet wheel and meshing teeth of the gear ring are oblique teeth, and the sun wheel and the gear ring are coaxial. The helical teeth of the sun gear rotate leftwards, the helical teeth of the planet gear rotate rightwards, and the helical teeth of the gear ring rotate leftwards. The planetary gear, the sun gear and the helical teeth of the gear ring can effectively avoid bearing damage and failure caused by the fact that the speed reducer is affected by large axial force in the working process, the service life is prolonged, the transmission efficiency is high, and meanwhile it can be guaranteed that the gear ring is stably fixed in the shell.

Description

Technical Field

[0001] The utility model relates to a planetary gear reducer. Background Art

[0002] A reducer is an independent component consisting of a gear drive, worm drive, or gear-worm drive enclosed in a rigid housing. It is commonly used as a reduction transmission device between the prime mover and the working machine. In the field of aerators, the reducer acts as a reduction transmission device connecting the motor and impeller. The impeller, which is underwater, generates a downward pull during operation, pulling on the reducer's output shaft. Because the deep groove ball bearings in ordinary reducers cannot withstand large axial forces, they are easily damaged and fail under long-term tension. To extend their service life, angular contact bearings are often used to replace deep groove ball bearings to secure the output shaft, which also increases manufacturing costs. Utility Model Content

[0003] In view of the defects of the existing reducers, the technical problem to be solved by the present invention is to provide a planetary gear reducer with low cost and reduced axial force.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, the present invention is implemented through the following technical measures:

[0005] A planetary gear reducer comprises: a planetary carrier assembly, the planetary carrier assembly comprises a planetary carrier connecting rod, the planetary carrier connecting rod is externally rotatably connected to a planetary gear, the planetary gear is externally meshed with a ring gear, the planetary gear is internally meshed with a sun gear, the sun gear is coaxial with the ring gear, the meshing teeth of the sun gear, the planetary gear and the ring gear are all helical teeth, the helical teeth of the sun gear are left-handed, the helical teeth of the planetary gear are right-handed, and the helical teeth of the ring gear are left-handed.

[0006] Furthermore, the helix angle of the helical teeth is 13-18°.

[0007] Furthermore, the planetary carrier assembly also includes an upper bracket and a base. The upper end of the planetary carrier connecting rod is threaded, and a nut is connected to the outside of the thread. The thread is a reverse thread. When the planetary carrier rotates clockwise, it will self-tighten to prevent loosening. The upper bracket is disc-shaped, and its axis extends upward to form a bearing seat I. A bearing I is provided in the bearing seat I. The bearing I is clamped to the inner wall of the top of the bearing seat I through a retaining spring, and the range of movement of the bearing I is limited to the bearing seat I. The base is disc-shaped, and its axis extends downward to form a bearing seat II. A bearing II is provided in the bearing seat II. The bearing II is clamped to the inner wall of the top of the bearing seat II through a retaining spring, and the range of movement of the bearing II is limited to the bearing seat II. A partition is fixed at the position corresponding to the bottom of the bearing seat II, and the outer sleeve of the base is provided with a bearing III.

[0008] Furthermore, a reducer output shaft is provided under the base, a bolt hole is opened at the end of the reducer output shaft, a hole is opened in the center of the partition of the bearing seat II, and the bolts pass through the partition and are fixed to the bolt holes of the reducer output shaft. The reducer output shaft is outer-circuited with an oil seal and a bearing IV, and the oil seal and bearing IV are separated by a retaining spring.

[0009] Furthermore, a nine-key slot is provided on the top of the sun gear, and the nine-key slot is connected to the motor. The motor drives the nine-key slot to rotate. A bearing V is provided in the planetary gear, and the bearing V is sleeved on the planetary carrier connecting rod.

[0010] Furthermore, there are two bearings V, which are separated by a retaining spring. The double-bearing design makes the planetary gear rotate more stably and effectively reduces noise during rotation.

[0011] Furthermore, the planetary carrier assembly is outer-circuited by a shell, the surface of which is provided with an anti-corrosion layer, the bottom of the shell is provided with a bearing seat III, the interior of the bearing seat III is hollow, a clip is fixed to the bottom of the shell, the ring gear and the clip are fixed by bolts, and the base and the reducer output shaft are rotationally connected to the bearing seat III through bearing III and bearing IV respectively.

[0012] Furthermore, the shell frame is made of metal, and the anti-corrosion layer is made of nylon alloy composite material.

[0013] Compared with the existing technology, the advantages of the present invention are: the helical teeth of the planetary gear, sun gear and ring gear can effectively prevent the reducer from being affected by large axial forces during operation, which may cause bearing damage and failure, thereby extending the service life and improving the transmission efficiency, while also ensuring that the ring gear is stably fixed in the housing; the planetary carrier connecting rod and the nut are matched with a reverse thread, and when the planetary carrier rotates clockwise, it will self-tighten to prevent loosening; the double-bearing design of the planetary gear and sun gear can make their rotation more stable and reduce noise; the anti-corrosion layer on the surface of the housing can ensure that the reducer can be used for a long time in highly corrosive waters. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 This is a schematic structural diagram of a planetary gear reducer described in the present utility model.

[0016] Figure 2 This is a schematic diagram of an explosion of a planetary gear reducer described in the present utility model.

[0017] Figure 3 This is a schematic diagram of the shell structure described in the present utility model.

[0018] Figure 4 This is an exploded schematic diagram of the overall structure of the planetary gear pair described in the present invention.

[0019] Explanation of the accompanying reference numerals: 1. Housing; 2. Planetary carrier assembly; 3. Reducer output shaft; 4. Base; 5. Planetary carrier connecting rod; 6. Upper bracket; 7. Bearing I; 8. Nine-key groove; 9. Planetary gear; 10. Ring gear; 11. Sun gear; 12. Bearing II; 13. Bearing seat II; 14. Bearing III; 15. Bearing seat III; 16. Clip; 17. Bolt hole; 18. Bearing IV; 19. Circlip; 20. Oil seal; 21. Partition; 22. Bearing seat I; 23. Thread; 24. Bearing V; 25. Helical tooth. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0021] In the description of the present invention, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", "bottom", "top", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 The planetary gear reducer includes: a planetary carrier assembly 2, the planetary carrier assembly 2 includes a planetary carrier connecting rod 5, the planetary carrier connecting rod 5 is externally connected to a planetary gear 9, the planetary gear 9 is externally meshed with a ring gear 10, the planetary gear 9 is internally meshed with a sun gear 11, the sun gear 11 is coaxial with the ring gear 10, the meshing teeth of the sun gear 11, the planetary gear 9 and the ring gear 10 are all helical teeth 25, the helical teeth 25 of the sun gear 11 are left-handed, the helical teeth 25 of the planetary gear 9 are right-handed, and the helical teeth 25 of the ring gear 10 are left-handed.

[0023] The helix angle of the helical teeth 25 is 13-18°.

[0024] The planetary carrier assembly 2, the planetary gears 9, the sun gear 11 and the ring gear 10 form a planetary gear pair integral structure.

[0025] The planetary gears 9 and the sun gear 11 are movably fixed in the gear ring 10 through the planetary carrier assembly 2. The planetary carrier assembly 2 also includes an upper bracket 6 and a base 4. The upper end of the planetary carrier connecting rod 5 is provided with a thread 23. The thread 23 is externally connected to a nut. The thread 23 is a reverse thread 23. When the planetary carrier rotates clockwise, it will self-tighten to prevent loosening. The upper bracket 6 is disc-shaped, and its axis extends upward to form a bearing seat Ⅰ22. A bearing Ⅰ7 is provided in the bearing seat Ⅰ22. The bearing Ⅰ7 is clamped with the inner wall of the top of the bearing seat Ⅰ22 through a retaining spring 19 to clamp the shaft. The range of movement of bearing I7 is limited to the bearing seat I22. The base 4 is disc-shaped, and its axis extends downward to form a bearing seat II13. A bearing II12 is provided in the bearing seat II13. The bearing II12 is clamped with the inner wall of the top of the bearing seat II13 through a retaining spring 19, and the range of movement of the bearing II12 is limited to the bearing seat II13. A partition 21 is fixed at a position corresponding to the bottom of the bearing seat II13 and the bearing II12. The base 4 is covered with a bearing III14. The rotation of the sun gear 11 drives the bearing I7 and the bearing II12 to be movably connected to the planetary carrier assembly 2.

[0026] A reducer output shaft 3 is provided under the base 4, and a bolt hole 17 is opened at the end of the reducer output shaft 3. The center of the partition 21 of the bearing seat II 13 is opened, and the bolt passes through the partition 21 and is fixed to the bolt hole 17 of the reducer output shaft 3. The reducer output shaft 3 is covered with an oil seal 20 and a bearing IV 18, and the oil seal 20 and the bearing IV 18 are separated by a retaining spring 19.

[0027] The top of the sun gear 11 is provided with a nine-key slot 8 , which is connected to the motor. The motor drives the nine-key slot 8 to rotate. A bearing V 24 is provided in the planetary gear 9 , and the bearing V 24 is sleeved on the planetary carrier connecting rod 5 .

[0028] There are two bearings V24, which are separated by a retaining spring 19. The double-bearing design makes the planetary gear 9 rotate more stably and effectively reduces noise during rotation.

[0029] The planetary carrier assembly 2 is outerly provided with a shell 1, the surface of which is provided with an anti-corrosion layer. A bearing seat III15 is provided at the bottom of the shell 1. The interior of the bearing seat III15 is hollow. A clip 16 is fixed to the bottom of the shell 1. The ring gear 10 and the clip 16 are fixed by bolts. The base 4 and the reducer output shaft 3 are rotationally connected to the bearing seat III15 through bearing III14 and bearing IV18 respectively.

[0030] The frame of the shell 1 is made of metal, and the anti-corrosion layer is made of nylon alloy composite material.

[0031] When a planetary gear reducer of the present invention is in use, the motor drives the sun gear 11 to rotate clockwise, the planet gear 9 to rotate counterclockwise, and the planet gear 9 drives the planet carrier assembly 2 to rotate clockwise. Since the sun gear 11 and the planet gear 9 are designed with helical teeth 25, and the sun gear 11 rotates left and the planet gear 9 rotates right, when the two rotate relative to each other, the axial component of the helical teeth 25 will push the sun gear 11 upward and press the ring gear 10 downward. The upward force on the sun gear 11 will offset the downward force on the output shaft caused by the impeller pulling it, so that the axial force of the reducer is in a balanced state, thereby avoiding the bearing from being subjected to a large axial force. The downward pressure on the ring gear 10 can make the ring gear 10 more firmly fixed in the housing 1.

[0032] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A planetary gear reducer comprising: A planetary carrier assembly, the planetary carrier assembly includes a planetary carrier connecting rod, the planetary carrier connecting rod is externally rotatably connected to a planetary gear, the planetary gear is externally meshed with a ring gear, the planetary gear is internally meshed with a sun gear, the sun gear is coaxial with the ring gear, and is characterized in that the meshing teeth of the sun gear, planetary gear and ring gear are all helical teeth, the helical teeth of the sun gear are left-handed, the helical teeth of the planetary gear are right-handed, and the helical teeth of the ring gear are left-handed, the upper end of the planetary carrier connecting rod is threaded, the thread is externally connected to a nut, and the thread is a reverse thread.

2. A planetary gear reducer according to claim 1, characterized in that: The helix angle of the helical teeth is 13-18°.

3. The planetary gear reducer according to claim 1, characterized in that: The planetary carrier assembly also includes an upper bracket and a base. The upper bracket is disc-shaped, and its axis extends upward to form a bearing seat I. A bearing I is arranged in the bearing seat I. The bearing I is clamped to the inner wall of the top of the bearing seat I through a retaining spring, so that the range of movement of the bearing I is limited to the bearing seat I. The base is disc-shaped, and its axis extends downward to form a bearing seat II. A bearing II is arranged in the bearing seat II, and the bearing II is clamped to the inner wall of the top of the bearing seat II through a retaining spring, so that the range of movement of the bearing II is limited to the bearing seat II. A partition is fixed at the position corresponding to the bottom of the bearing seat II, and the outer sleeve of the base is provided with a bearing III.

4. A planetary gear reducer according to claim 3, characterized in that: A reducer output shaft is provided under the base, a bolt hole is provided at the end of the reducer output shaft, a hole is provided in the center of the partition of the bearing seat II, a bolt passes through the partition and is fixed to the bolt hole of the reducer output shaft, and an oil seal and a bearing IV are provided on the outer sleeve of the reducer output shaft, and the oil seal and the bearing IV are separated by a retaining spring.

5. The planetary gear reducer according to claim 1, characterized in that: The top of the sun gear is provided with a nine-key slot, which is connected to the motor. The motor drives the nine-key slot to rotate. A bearing V is provided in the planetary gear, and the bearing V is sleeved on the planetary carrier connecting rod.

6. The planetary gear reducer according to claim 5, characterized in that: There are two bearings V, and the bearings V are separated by a retaining spring.

7. The planetary gear reducer according to claim 4, characterized in that: The planetary carrier assembly is outer-circuited with a shell, the surface of which is provided with an anti-corrosion layer, the bottom of the shell is provided with a bearing seat III, the interior of the bearing seat III is hollow, a clip is fixed to the bottom of the shell, the gear ring and the clip are fixed by bolts, and the base and the reducer output shaft are rotationally connected to the bearing seat III through bearing III and bearing IV respectively.

8. The planetary gear reducer according to claim 7, characterized in that: The shell frame is made of metal, and the anti-corrosion layer is made of nylon alloy composite material.

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