Planetary gearbox with planet carrier of double-wall type structure
By using a planetary carrier double-wall structure and component connection method, the problems of pin verticality and rigidity are solved, thereby improving the stability and performance of the gearbox, reducing noise and heat generation, and making it suitable for applications with strict space requirements.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU WEICHUANG MEDICAL EQUIP TECH CO LTD
- Filing Date
- 2025-06-11
- Publication Date
- 2026-05-12
AI Technical Summary
In the existing technology, it is difficult to ensure the perpendicularity of the pins on the planetary carrier, which leads to assembly difficulties and low structural rigidity, resulting in problems such as high heat generation and high noise in the gearbox.
It adopts a planetary carrier double-wall structure, and improves the pin perpendicularity and overall meshing rigidity by screwing the gear ring, connecting sleeve and bearing housing assembly. Plastic planetary gears reduce wear, multi-stage planetary carrier assembly realizes multi-stage transmission, and rolling bearings reduce friction.
It effectively improves the perpendicularity of the pin shaft, reduces the defect rate, enhances the stability of the gear ring, improves the performance of the gearbox, reduces noise and heat generation, and meets the requirements for long-term working stability.
Smart Images
Figure CN224229197U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of power equipment technology, and in particular to a planetary gearbox with a planetary carrier double-wall structure. Background Technology
[0002] Currently, small, high-speed gearboxes are finding increasingly widespread applications, such as in robotics and medical devices. Combining a gearbox with a micro motor can create a prime mover for various space-constrained applications.
[0003] In existing technologies, planetary carriers generally adopt a single-wall structure. On the one hand, the perpendicularity of the pins on the planetary carrier cannot be guaranteed, leading to assembly difficulties; on the other hand, the planetary carrier structure has low rigidity and is prone to elastic deformation during operation, resulting in problems such as high overall heat generation and noise in the gearbox. Summary of the Invention
[0004] This application provides a planetary gearbox with a planetary carrier double-wall structure to solve the technical problem in the prior art where it is difficult to ensure the perpendicularity of the pins on the planetary carrier, which leads to assembly difficulties.
[0005] In a first aspect, this application provides a planetary gearbox with a planetary carrier double-wall structure, comprising: a planetary carrier assembly, a connecting sleeve disposed on one side of the planetary carrier assembly, a bearing housing assembly disposed on the other side of the planetary carrier assembly, and a gear ring sleeved on the outside of the planetary carrier assembly, wherein one end of the gear ring is connected to the connecting sleeve, and the other end of the gear ring is connected to the bearing housing assembly.
[0006] Furthermore, the gear ring and the connecting sleeve are connected by a screw connection, and the other end of the gear ring is connected to the bearing housing assembly by a screw connection.
[0007] Furthermore, the planetary carrier assembly includes: a first planetary carrier, a second planetary carrier, and pins. The first planetary carrier and the second planetary carrier are each provided with a plurality of mounting holes corresponding to the pins. One end of the pin passes through the mounting hole of the first planetary carrier, and the other end passes through the mounting hole of the second planetary carrier. The two ends of the pin do not exceed the end faces of the first planetary carrier and the second planetary carrier, respectively.
[0008] Furthermore, an output shaft is provided on the first planetary carrier, and the output shaft is located on the side of the first planetary carrier away from the second planetary carrier.
[0009] Furthermore, a plurality of planetary gears are provided between the first planetary carrier and the second planetary carrier, the pin passes through the through hole in the center of the planetary gear, and the planetary gear meshes with the gear ring.
[0010] Furthermore, a sun gear is disposed between the first planetary carrier and the second planetary carrier, and the sun gear meshes with the planetary gears respectively.
[0011] Furthermore, multiple sets of the planetary carrier assemblies are connected to form a multi-level planetary carrier group, with the output shaft of the first planetary carrier of the previous level planetary carrier assembly serving as the input end of the next level planetary carrier assembly.
[0012] Furthermore, the bearing housing assembly has several bearing housing bores inside, each bearing is embedded in a bearing housing bore, and each bearing is fitted onto the output shaft of the first planetary carrier.
[0013] Furthermore, the planetary gears are made of plastic.
[0014] Furthermore, a front end cover is provided on the side of the bearing housing assembly away from the planetary carrier assembly, and the front end cover is connected to the bearing housing assembly.
[0015] The technical solutions provided in this application have the following advantages compared with the prior art:
[0016] The method provided in this application embodiment can effectively improve the perpendicularity of the pin in the planetary carrier assembly. On the one hand, it greatly reduces the defect rate of the planetary carrier assembly, and on the other hand, it increases the overall meshing stiffness of the gear ring, thus greatly improving the performance of the gearbox. Attached Figure Description
[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.
[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.
[0020] Figure 1 This is a schematic diagram of a planetary gearbox with a planetary carrier and double-wall structure, provided as an embodiment of this application.
[0021] Figure 2 This is a schematic diagram of the planetary carrier assembly.
[0022] Figure 3 This is a cross-sectional schematic diagram of the planetary carrier assembly.
[0023] Explanation of reference numerals in the attached figures:
[0024] 1. Planetary carrier assembly; 11. First planetary carrier; 111. Mounting hole; 112. Output shaft; 12. Second planetary carrier; 13. Pin; 14. Planetary gear; 15. Sun gear; 2. Connecting sleeve; 3. Bearing housing assembly; 31. Bearing housing inner hole; 32. Bearing; 4. Gear ring; 5. Front end cover. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0026] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.
[0027] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.
[0028] To address the technical problem of difficulty in ensuring the perpendicularity of the pins on the planetary carrier in the prior art, which leads to assembly difficulties, this application provides a planetary gearbox with a double-walled planetary carrier structure. This effectively improves the perpendicularity of the pins in the planetary carrier assembly, greatly reducing the defect rate of the planetary carrier assembly and increasing the overall meshing stiffness of the gear ring, thus significantly improving the performance of the gearbox.
[0029] Figure 1 A planetary gearbox with a planetary carrier double-wall structure provided in this application includes: a planetary carrier assembly 1, a connecting sleeve 2 disposed on one side of the planetary carrier assembly 1, a bearing housing assembly 3 disposed on the other side of the planetary carrier assembly 1, and a gear ring 4 sleeved on the outside of the planetary carrier assembly 1. One end of the gear ring 4 is connected to the connecting sleeve 2, and the other end of the gear ring 4 is connected to the bearing housing assembly 3. The planetary carrier assembly 1 includes: a first planetary carrier 11, a second planetary carrier 12, and a pin 13. The first planetary carrier 11 and the second planetary carrier are respectively provided with a plurality of mounting holes 111 evenly distributed corresponding to the pin 13. One end of the pin 13 passes through the mounting hole 111 of the first planetary carrier 11, and the other end passes through the mounting hole 111 of the second planetary carrier 12. The two ends of the pin 13 do not exceed the end faces of the first planetary carrier 11 and the second planetary carrier 12, respectively.
[0030] By connecting the gear ring 4 to the connecting sleeve 2 and the bearing housing assembly 3 respectively, the overall stability of the gear ring 4 is improved, thereby effectively increasing the overall meshing stiffness of the planetary gear train. Simultaneously, mounting holes 111 are correspondingly provided on the first planetary carrier 11 and the second planetary carrier 12, and the two ends of the pin 13 are respectively inserted into the mounting holes 111 of the first planetary carrier 11 and the second planetary carrier 12. This effectively improves the perpendicularity of the pin 13 relative to the first planetary carrier 11 and the second planetary carrier 12, enhancing the stability of the pin 13, thereby effectively reducing the defect rate of the planetary carrier assembly 1 and meeting the stability requirements under long-term operation.
[0031] In some embodiments, the gear ring 4 is connected to the connecting sleeve 2 by a screw connection, and the other end of the gear ring 4 is connected to the bearing housing assembly 3 by a screw connection. By screwing the gear ring 4 to the connecting sleeve 2 and the bearing housing assembly 3, the gear ring 4 can be quickly assembled while being securely tightened to form a stable connection structure, improving the stability of the gear ring 4 and effectively enhancing the overall meshing stiffness of the planetary gear train.
[0032] In some embodiments, an output shaft 112 is provided on the first planetary carrier 11, and the output shaft 112 is located on the side of the first planetary carrier 11 away from the second planetary carrier 12. By providing an output shaft 112 integrated with the first planetary carrier 11, torque is output through the output shaft 112 during the driving process, thereby meeting the needs of various applications with strict space requirements as a prime mover. The output shaft 112 is provided with a key and / or a pin hole. By setting a key on the key or inserting a pin into the pin hole, it is connected and fixed to an external mechanism, thereby enabling the torque on the output shaft 112 to be output to the connected structure, achieving the driving effect.
[0033] In some embodiments, a plurality of planetary gears 14 are disposed between the first planetary carrier 11 and the second planetary carrier 12. A pin 13 passes through a through hole in the center of each planetary gear 14. The planetary gears 14 mesh with a ring gear 4. A sun gear 15 is disposed between the first planetary carrier 11 and the second planetary carrier 14. The axis of the sun gear 15 is collinear with the center lines of both the first planetary carrier 11 and the second planetary carrier 12. The sun gear 15 meshes with each of the planetary gears 14. A through hole is provided in the center of the second planetary carrier 12 corresponding to the sun gear 15. The shaft of the sun gear 15 extends through the through hole in the center of the second planetary carrier 12 and serves as an input end. The input torque is applied to the sun gear 15, thereby driving the planetary gears 14 to rotate and perform circular motion along the ring gear 4. During the circular motion of the planetary gears 14, the pin 13 drives the first planetary carrier 11 and the second planetary carrier 12 to rotate synchronously, and the torque is output through the output shaft 112 on the first planetary carrier 11.
[0034] In some alternative embodiments, the planetary gears 14 are made of plastic, which facilitates processing and molding, effectively reducing overall production costs and overall structural weight, thus optimizing the overall weight of the planetary gearbox. Furthermore, since the planetary gears 14 continuously rub against the sun gear 15 and the ring gear 4 during operation, wear will occur on each gear tooth over prolonged use. By using plastic for the planetary gears 14, wear is concentrated on the more easily replaceable planetary gears, effectively reducing overall maintenance costs and meeting cost control requirements.
[0035] In some embodiments, multiple planetary carrier assemblies 1 are connected to form a multi-stage planetary carrier group, with the output shaft 112 of the first planetary carrier 11 of the previous stage serving as the input end of the next stage planetary carrier assembly 1. Some devices connected to gearboxes require multi-stage transmission to achieve corresponding speed reduction and high torque output to meet specific drive requirements. Therefore, a multi-stage planetary carrier group is needed for power transmission to meet the speed reduction requirements. In a multi-stage planetary carrier group, a sun gear 15 is connected to the end of the output shaft 112 of the first planetary carrier 11 in the previous stage planetary carrier assembly 1, meshing with the planetary gears 14 in the next stage planetary carrier assembly 1. This allows the output torque from the previous stage planetary carrier assembly 1 to be applied to the next stage planetary carrier assembly 1 after meshing and outputting power, thus realizing the transmission of the multi-stage planetary carrier group. The multi-stage planetary carrier group, with multiple planetary carrier assemblies 1 working simultaneously, can evenly distribute the load, fully utilizing the load-bearing capacity of each gear, thereby greatly improving the load-bearing capacity of the entire transmission system.
[0036] In some embodiments, the bearing housing assembly 3 has a plurality of bearing housing bores 31 inside, and bearings 32 are respectively embedded in the bearing housing bores 31. The bearings 32 are respectively sleeved on the output shafts 112 on the first planetary carrier 11. The bearings 32 are rolling bearings. A rolling bearing is a precision mechanical component that converts the sliding friction between the rotating shaft and the bearing housing into rolling friction, thereby reducing friction loss. It generally consists of an outer ring, an inner ring, rolling elements, and a cage. The outer ring is installed in the bearing housing bores 31, the inner ring is sleeved on the output shaft 112, and the rolling elements roll on the raceway between the inner and outer rings. By transmitting load through the rolling of the rolling elements inside the rolling bearing, the coefficient of friction is greatly reduced, making the rotation of the output shaft 112 smoother, reducing energy consumption, and improving mechanical efficiency. By setting the bearings 32, a guiding function is provided for the output shaft 112 on the first planetary carrier 11, and the frictional effect of the guide on the output shaft 112 is reduced, thereby effectively ensuring the stable rotation of the output shaft 112 of the first planetary carrier 11.
[0037] In some embodiments, a front cover 5 is provided on the side of the bearing housing assembly 3 away from the planetary carrier assembly 1, and the front cover 5 is connected to the bearing housing assembly 3. By providing the front cover 5 to be connected and fixed to the bearing housing assembly 3, in addition to providing guidance and protection for the output shaft 112 of the first planetary carrier 11, a threaded hole can be provided on the front cover 5 so that screws can be passed through the fixing plate of the equipment and locked into the threaded hole, thereby realizing the installation and fixing of the planetary gearbox and meeting the fixed setting requirements.
[0038] The method provided in this application improves the overall stability of the gear ring 4 by connecting the gear ring 4 to the connecting sleeve 2 and the bearing housing assembly 3, thereby effectively improving the overall meshing stiffness of the planetary gear train. Simultaneously, by providing mounting holes 111 on the first planetary carrier 11 and the second planetary carrier 12 respectively, and by inserting both ends of the pin 13 into the mounting holes 111 of the first planetary carrier 11 and the second planetary carrier 12 respectively, the perpendicularity of the pin 13 relative to the first planetary carrier 11 and the second planetary carrier 12 is effectively improved, thus enhancing the stability of the pin 13. This effectively reduces the defect rate of the planetary carrier assembly 1 and meets the stability requirements under long-term operation.
[0039] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.
[0040] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", 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 application and 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 application.
[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; 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; 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 application according to the specific circumstances.
[0043] In this application, unless otherwise expressly 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 being 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 being 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 specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.
[0045] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Since these modifications and variations fall within the scope of the claims and their equivalents, this application also intends to include these modifications and variations.
[0046] The above description describes specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A planetary gearbox with a planetary carrier and double-wall structure, characterized in that, It includes: a planetary carrier assembly, a connecting sleeve disposed on one side of the planetary carrier assembly, a bearing housing assembly disposed on the other side of the planetary carrier assembly, and a gear ring sleeved on the outside of the planetary carrier assembly, one end of the gear ring being connected to the connecting sleeve, and the other end of the gear ring being connected to the bearing housing assembly.
2. The planetary gearbox with a double-walled planetary carrier structure according to claim 1, characterized in that, The gear ring and the connecting sleeve are connected by a screw connection, and the other end of the gear ring is connected to the bearing housing assembly by a screw connection.
3. The planetary gearbox with a double-walled planetary carrier structure according to claim 1, characterized in that, The planetary carrier assembly includes a first planetary carrier, a second planetary carrier, and pins. The first planetary carrier and the second planetary carrier are each provided with a plurality of mounting holes corresponding to the pins. One end of the pin passes through the mounting hole of the first planetary carrier and the other end passes through the mounting hole of the second planetary carrier. The two ends of the pin do not exceed the end faces of the first planetary carrier and the second planetary carrier, respectively.
4. The planetary gearbox with a double-walled planetary carrier structure according to claim 3, characterized in that, An output shaft is provided on the first planetary carrier, and the output shaft is located on the side of the first planetary carrier away from the second planetary carrier.
5. The planetary gearbox with a double-walled planetary carrier structure according to claim 3, characterized in that, A plurality of planetary gears are provided between the first planetary carrier and the second planetary carrier. The pin passes through the through hole in the center of the planetary gear, and the planetary gear meshes with the gear ring.
6. The planetary gearbox with a double-walled planetary carrier structure according to claim 5, characterized in that, A sun gear is disposed between the first planetary carrier and the second planetary carrier, and the sun gear meshes with the planetary gears respectively.
7. The planetary gearbox with a double-walled planetary carrier structure according to claim 4, characterized in that, Multiple sets of the planet carrier assemblies are connected to form a multi-level planet carrier group, and the output shaft of the first planet carrier of the previous level planet carrier assembly serves as the input end of the next level planet carrier assembly.
8. The planetary gearbox with a double-walled planetary carrier structure according to claim 4, characterized in that, The bearing housing assembly has several bearing housing bores inside, and bearings are embedded in the bearing housing bores. The bearings are respectively sleeved on the output shaft of the first planetary carrier.
9. The planetary gearbox with a double-walled planetary carrier structure according to claim 5, characterized in that, The planetary gears are made of plastic.
10. The planetary gearbox with a double-walled planetary carrier structure according to claim 1, characterized in that, The bearing housing assembly has a front end cover on the side away from the planetary carrier assembly, and the front end cover is connected to the bearing housing assembly.