Two-stage planetary gear speed reducer
By using components such as ball bearings and end caps in a two-stage planetary gear reducer, the problem of untreated axial force was solved, achieving stable gear meshing and high-precision transmission.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG WINS MACHINERY
- Filing Date
- 2025-07-10
- Publication Date
- 2026-05-12
AI Technical Summary
The existing two-stage planetary gear reducer does not have effective measures to handle axial forces, which may cause axial displacement or movement of the second-stage planetary support, affecting gear meshing accuracy and service life.
The first and second ball bearings support the first and second planetary carriers, and the various parts are tightly connected by end cover plates and connecting bodies to coordinate and balance axial forces and ensure stable gear meshing.
It effectively withstands and balances axial forces, maintains good gear meshing, reduces transmission errors, and improves transmission accuracy and service life.
Smart Images
Figure CN224229187U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of speed reducer technology and relates to a two-stage planetary gear reducer. Background Technology
[0002] Two-stage planetary gear reducers are a type of high-efficiency power transmission device, characterized by their compact structure, high transmission efficiency, and strong load-bearing capacity. They are widely used in engineering machinery, automation equipment, new energy fields, and other applications requiring high torque output.
[0003] Chinese patent publication number CN204140785U discloses a two-stage planetary gear reducer, including a primary planetary carrier, a primary planetary gear mounted on the primary planetary carrier, a secondary planetary carrier, and a secondary planetary gear mounted on the secondary planetary carrier. The primary planetary gear meshes internally with a primary gear ring, and a primary transmission tooth is provided in the middle of the primary gear ring. The primary transmission tooth passes through the secondary planetary carrier and meshes externally with the secondary planetary gear. The secondary planetary gear meshes internally with the secondary gear ring, and an output shaft is synchronously connected to the middle of the secondary gear ring. The primary planetary carrier and the secondary planetary carrier each have mounting flanges, and the mounting flanges are respectively provided with buckles and protrusions. The primary planetary carrier and the secondary planetary carrier are fixedly engaged.
[0004] The patent provides a two-stage planetary gear reducer, but it does not include effective measures to address the increased axial force. If the axial force is not properly addressed, it may cause axial displacement or movement of the two-stage planetary support, affecting the meshing accuracy of the gears, accelerating gear wear, and shortening the service life of the reducer. Utility Model Content
[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a two-stage planetary gear reducer.
[0006] The objective of this utility model can be achieved through the following technical solution: A two-stage planetary gear reducer includes a gear ring body, a front end cover plate, a rear end cover plate, a first-stage planetary gear set, a second-stage planetary gear set, and a drive motor. The gear ring body is annular and has a gear-like structure inside. The first-stage planetary gear set includes a first-stage planetary gear, a first-stage sun gear, and a first-stage planetary carrier. A first bearing hole is opened in the middle of one side of the first-stage planetary carrier, and a first ball bearing is fixed in the first bearing hole. A first-stage fixing post is fixed at the end of the first-stage planetary carrier. The first-stage planetary gear is sleeved on the outside of the first-stage fixing post, and first-stage fixing plates are fixed on both sides of the first-stage planetary gear. The drive motor has a motor shaft extending out, and one end of the motor shaft extends into the first bearing hole and is connected to the first ball bearing. The first-stage sun gear is sleeved on the outside of the motor shaft, and the first-stage sun gear... The gear meshes with the first-stage planetary gear. A first-stage connecting shaft is formed on one side of the first-stage planetary carrier. The second-stage planetary gear set includes a second-stage planetary gear, a second-stage sun gear, and a second-stage planetary carrier. A second bearing hole is opened in the middle of one side of the second-stage planetary carrier, and a second ball bearing is fixed in the second bearing hole. The first-stage connecting shaft extends into the second bearing hole and is connected to the second ball bearing. A first limiting platform is formed at the end of the first-stage connecting shaft. The second-stage sun gear is sleeved on the outside of the first-stage connecting shaft and fits against the first limiting platform. A second-stage fixing post is fixed at the end of the second-stage planetary carrier. The second-stage planetary gear is sleeved on the outside of the second-stage fixing post, and second-stage fixing plates are fixed on both sides of the second-stage planetary gear. The second-stage planetary gear meshes with the second-stage sun gear. Both the first-stage and second-stage planetary gears mesh with the inside of the gear ring body.
[0007] In the aforementioned two-stage planetary gear reducer, a first-stage connecting bearing is connected to the end of the first-stage fixed column. The first-stage connecting bearing is installed between the end of the first-stage planetary carrier and the first-stage fixed plate, and both sides of the first-stage connecting bearing are respectively in contact with the end of the first-stage planetary carrier and the first-stage fixed plate.
[0008] In the aforementioned two-stage planetary gear reducer, a secondary connecting bearing is connected to the end of the secondary fixed column. The secondary connecting bearing is installed between the end of the secondary planetary carrier and the secondary fixed plate, and both sides of the secondary connecting bearing are respectively in contact with the end of the secondary planetary carrier and the secondary fixed plate.
[0009] In the aforementioned two-stage planetary gear reducer, a secondary connecting shaft is formed on one side of the secondary planetary carrier, the front end cover is sleeved on the outside of the secondary connecting shaft and connected to the secondary connecting shaft, and the rear end cover is sleeved on the outside of the motor shaft and connected to the motor shaft.
[0010] In the aforementioned two-stage planetary gear reducer, an extension connector is formed on the outer side of the gear ring body. A front connector and a rear connector adapted to the extension connector are respectively formed on the outer periphery of the front end cover plate and the rear end cover plate. A front spacer is provided between the front connector and the extension connector, and a rear spacer is provided between the rear connector and the extension connector. A front fixing pin is passed through and fixed between the front connector, the front spacer, and the extension connector, and a rear fixing pin is passed through and fixed between the rear connector, the rear spacer, and the extension connector.
[0011] In the aforementioned two-stage planetary gear reducer, the rear end cover plate is fitted to and fixedly connected to the end face of the drive motor.
[0012] Compared with the prior art, the two-stage planetary gear reducer provided by this utility model has the following beneficial effects: 1. The first ball bearing in the first bearing hole and the second ball bearing in the second bearing hole not only play a supporting role and reduce friction, but also effectively bear and balance the axial force generated from the motor shaft and the gear transmission process of each stage, ensuring the stability of the motor shaft, the first stage connecting shaft and other components in the axial direction, so that the gears can maintain a good meshing state, reduce the transmission error caused by axial movement, and improve the transmission accuracy of the reducer; 2. Through the cooperation of the front end cover plate, the rear end cover plate, the gear ring body and the extension connecting body, the front connecting body, the rear connecting body, the front spacer, the rear spacer and the front fixing pin, the various parts of the reducer are tightly connected together, and the axial force between the components can be better coordinated and balanced during the power transmission process. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0014] Figure 2 This is a schematic diagram of the internal structure of this utility model;
[0015] Figure 3 This is a schematic diagram of the exploded structure of this utility model.
[0016] In the diagram: 1. Gear ring body; 11. Extension connector; 2. Front end cover plate; 21. Front connector; 3. Rear end cover plate; 31. Rear connector; 4. First-stage planetary gear set; 41. First-stage planetary gear; 42. First-stage sun gear; 43. First-stage planetary carrier; 431. First bearing hole; 432. First-stage connecting shaft; 433. First limiting platform; 44. First ball bearing; 45. First-stage fixing post; 46. First-stage fixing plate; 47. First-stage connecting bearing; 5. Second-stage planetary gear set; 51. Second-stage planetary gear; 52. Second-stage sun gear; 53. Second-stage planetary carrier; 531. Second bearing hole; 532. Second-stage connecting shaft; 54. Second ball bearing; 55. Second-stage fixing post; 56. Second-stage fixing plate; 57. Second-stage connecting bearing; 6. Drive motor; 61. Motor shaft; 7. Front fixing pin; 8. Rear fixing pin; 9. Front spacer; 10. Rear spacer. Detailed Implementation
[0017] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.
[0018] like Figures 1 to 3 As shown, this embodiment includes a gear ring body 1, a front end cover plate 2, a rear end cover plate 3, a first-stage planetary gear set 4, a second-stage planetary gear set 5, and a drive motor 6. The gear ring body 1 is annular in shape, and its inner wall is machined with gear-shaped structures for meshing and connecting with the first-stage planetary gear set 4 and the second-stage planetary gear set 5.
[0019] like Figures 1 to 3 As shown, the first-stage planetary gear set 4 consists of a first-stage planetary gear 41, a first-stage sun gear 42, and a first-stage planetary carrier 43. A first bearing hole 431 is opened in the middle of one side of the first-stage planetary carrier 43. A first ball bearing 44 is installed in the first bearing hole 431 with an interference fit. Three first-stage fixing posts 45 are evenly distributed and fixed along the circumference at the end of the first-stage planetary carrier 43. A first-stage planetary gear 41 is sleeved on the outside of each first-stage fixing post 45. The first-stage planetary gear 41 is axially positioned on both sides by first-stage fixing plates 46. A first-stage connecting bearing 47 is installed at the end of the first-stage fixing post 45. This bearing is located between the end of the first-stage planetary carrier 43 and the first-stage fixing plate 46 to ensure that the first-stage planetary gear 41 rotates flexibly. One end of the motor shaft 61 of the drive motor 6 extends into the first bearing hole 431 and is interference-fitted with the inner ring of the first ball bearing 44. The first-stage sun gear 42 is sleeved on the outside of the motor shaft 61 through a key connection, and the first-stage sun gear 42 meshes with the first-stage planetary gear 41. The first-stage planetary carrier 43 extends to form a first-stage connecting shaft 432 on the side away from the first bearing hole 431, and a first limiting platform 433 is machined at its end.
[0020] like Figures 1 to 3As shown, the second-stage planetary gear set 5 consists of a second-stage planetary gear 51, a second-stage sun gear 52, and a second-stage planetary carrier 53. A second bearing hole 531 is formed in the middle of one side of the second-stage planetary carrier 53. A second ball bearing 54 is installed in the second bearing hole 531 with an interference fit. A first-stage connecting shaft 432 extends into the second bearing hole 531 and has an interference fit with the inner ring of the second ball bearing 54. The second-stage sun gear 52 is sleeved on the outside of the first-stage connecting shaft 432 and axially fitted with the first limiting platform 433. The ends of the second-stage planetary carrier 53 are evenly distributed with fixed bearings along the circumference. Three secondary fixed posts 55, each with a secondary planetary gear 51 sleeved on its exterior. The secondary planetary gear 51 is axially positioned on both sides by secondary fixed plates 56. A secondary connecting bearing 57 is installed at the end of the secondary fixed post 55. The secondary connecting bearing 57 is located between the end of the secondary planetary carrier 53 and the secondary fixed plate 56 to ensure that the secondary planetary gear 51 rotates flexibly. The secondary planetary gear 51 meshes externally with the secondary sun gear 52, and both the primary planetary gear 41 and the secondary planetary gear 51 mesh with the gears on the inner wall of the gear ring body 1.
[0021] To elaborate further, such as Figure 1 and Figure 3 As shown, the secondary planetary carrier 53 extends to form a secondary connecting shaft 532 on the side away from the second bearing hole 531. The front end cover plate 2 is sleeved on the outside of the secondary connecting shaft 532 and rotatably connected to it. The rear end cover plate 3 is sleeved on the outside of the motor shaft 61 and rotatably connected to it.
[0022] To elaborate further, such as Figure 1 and Figure 3 As shown, an extension connector 11 is integrally formed on the outer middle of the gear ring body 1. A front connector 21 and a rear connector 31 are integrally formed on the outer periphery of the front end cover plate 2 and the rear end cover plate 3, respectively. A front spacer 9 is provided between the front connector 21 and the extension connector 11, and a rear spacer 10 is provided between the rear connector 31 and the extension connector 11. The front fixing pin 7 and the rear fixing pin 8 are respectively inserted and fixed to ensure accurate axial positioning of each stage of the structure. The rear end cover plate 3 is attached to the end face of the drive motor 6 and fixedly connected by bolts to form a complete reducer housing structure.
[0023] The working principle of this utility model is as follows: When the drive motor 6 is working, the motor shaft 61 drives the first-stage sun gear 42 to rotate. The first-stage sun gear 42 drives the first-stage planetary gear 41 to rotate around the first-stage fixed column 45 and revolve along the inner wall of the gear ring body 1. The first-stage planetary carrier 43 rotates accordingly. The first-stage planetary carrier 43 drives the second-stage sun gear 52 to rotate through the first-stage connecting shaft 432. The second-stage sun gear 52 drives the second-stage planetary gear 51 to rotate around the second-stage fixed column 55 and revolve along the inner wall of the gear ring body 1. Finally, the decelerated power is output by the second-stage connecting shaft 532 of the second-stage planetary carrier 53. Through the deceleration of the two-stage planetary gears, a large transmission ratio and high efficiency power transmission are achieved.
[0024] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.
[0025] Although this document uses a variety of terms, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.
Claims
1. A two-stage planetary gear reducer, comprising a gear ring body (1), a front end cover plate (2), a rear end cover plate (3), a first-stage planetary gear set (4), a second-stage planetary gear set (5), and a drive motor (6), characterized in that: The gear ring body (1) is annular and has a gear-like structure inside. The first-stage planetary gear set (4) includes a first-stage planetary gear (41), a first-stage sun gear (42), and a first-stage planetary carrier (43). A first bearing hole (431) is opened in the middle of one side of the first-stage planetary carrier (43), and a first ball bearing (44) is fixed in the first bearing hole (431). A first-stage fixing post (45) is fixed at the end of the first-stage planetary carrier. The first-stage planetary gear (41) is sleeved on the outside of the first-stage fixing post (45) and A primary planetary gear (41) has primary fixing plates (46) fixed on both sides. The drive motor (6) has a motor shaft (61) extending out, and one end of the motor shaft (61) extends into the first bearing hole (431) and is connected to the first ball bearing (44). The primary sun gear (42) is sleeved on the outside of the motor shaft (61) and meshes with the primary planetary gear (41). A primary connecting shaft (432) is formed on one side of the primary planetary carrier (43). The secondary planetary gear set (5) The system includes a second-stage planetary gear (51), a second-stage sun gear (52), and a second-stage planetary carrier (53). A second bearing hole (531) is provided in the middle of one side of the second-stage planetary carrier (53), and a second ball bearing (54) is fixed in the second bearing hole (531). A first-stage connecting shaft (432) extends into the second bearing hole (531) and connects to the second ball bearing (54). A first limiting platform (433) is formed at the end of the first-stage connecting shaft (432). The second-stage sun gear (52) is sleeved on... The first-stage connecting shaft (432) is external and fits against the first limiting platform (433). The end of the second-stage planetary carrier (53) is fixed with a second-stage fixing column (55). The second-stage planetary gear (51) is sleeved on the outside of the second-stage fixing column (55) and the second-stage fixing plates (56) are fixed on both sides of the second-stage planetary gear (51). The second-stage planetary gear (51) meshes with the second-stage sun gear (52). The first-stage planetary gear (41) and the second-stage planetary gear (51) are both meshed with the inside of the gear ring body (1).
2. The two-stage planetary gear reducer according to claim 1, characterized in that: The first-stage fixed column (45) is connected to a first-stage connecting bearing (47) at its end. The first-stage connecting bearing (47) is installed between the end of the first-stage planetary carrier (43) and the first-stage fixed plate (46), and the two sides of the first-stage connecting bearing (47) are respectively attached to the end of the first-stage planetary carrier (43) and the first-stage fixed plate (46).
3. A two-stage planetary gear reducer according to claim 1, characterized in that: The end of the secondary fixed column (55) is connected to a secondary connecting bearing (57). The secondary connecting bearing (57) is installed between the end of the secondary planetary carrier (53) and the secondary fixed plate (56), and the two sides of the secondary connecting bearing (57) are respectively attached to the end of the secondary planetary carrier (53) and the secondary fixed plate (56).
4. A two-stage planetary gear reducer according to claim 1, characterized in that: A secondary connecting shaft (532) is formed on one side of the secondary planetary carrier (53). The front end cover (2) is sleeved on the outside of the secondary connecting shaft (532) and connected to the secondary connecting shaft (532). The rear end cover (3) is sleeved on the outside of the motor shaft (61) and connected to the motor shaft (61).
5. A two-stage planetary gear reducer according to claim 1, characterized in that: An extension connector (11) is formed on the outer side of the gear ring body (1). A front connector (21) and a rear connector (31) adapted to the extension connector (11) are formed on the outer periphery of the front end cover plate (2) and the rear end cover plate (3), respectively. A front spacer (9) is provided between the front connector (21) and the extension connector (11). A rear spacer (10) is provided between the rear connector (31) and the extension connector (11). A front fixing pin (7) is passed through and fixed between the front connector (21), the front spacer (9) and the extension connector (11). A rear fixing pin (8) is passed through and fixed between the rear connector (31), the rear spacer (10) and the extension connector (11).
6. A two-stage planetary gear reducer according to claim 1, characterized in that: The rear end cover plate (3) is attached to the end face of the drive motor (6) and is fixedly connected to the end face of the drive motor (6).