A planetary gear reducer

Abstract

This invention provides a planetary gear reducer, belonging to the technical field of reducer technology. It solves the problem of unstable torque in existing technologies. This invention includes a front housing, a gear ring body, a rear housing, a planetary gear assembly, an input shaft, and an output splined shaft. The front housing, gear ring body, and rear housing are connected sequentially, and the planetary gear assembly is installed inside the front housing, gear ring body, and rear housing. The planetary gear assembly includes planetary gears, a sun gear, and a planet carrier. The planet carrier is a hollow annular sleeve with a mounting hole in the center and a connecting ring formed on the rear side. The planetary gears are fitted onto the planetary shafts and located in the mounting hole, meshing with the inner side of the gear ring body. The sun gear is located inside the planet carrier and meshes with the planetary gears. A keyway groove is formed on the inner side of the connecting ring groove on the rear side of the planet carrier, and the output splined shaft is connected to the rear side of the planet carrier through the keyway groove. This invention has the advantages of stable torque transmission and high precision.

Description

Technical Field

[0001] This utility model belongs to the field of speed reducer technology and relates to a planetary gear reducer. Background Technology

[0002] Planetary gearboxes are widely used in transmission systems such as servo motors, stepper motors, and DC motors due to their advantages such as small size, high transmission efficiency, wide reduction range, and high precision. Their function is to reduce speed, increase torque, and reduce the moment of inertia ratio of the load motor while ensuring precise transmission.

[0003] Chinese patent publication number CN219299887U discloses a planetary gear reducer, including a reducer housing, with reducer protective covers fixedly installed at both ends of the reducer housing. A first planetary reduction assembly is provided on the inner side of the reducer housing. The first planetary reduction assembly includes a driving planetary gear ring, a driven gear, a first driving gear, and an input shaft. The outer side of the driving planetary gear ring is fixedly connected to the inner side of the reducer housing. Multiple driven gears are meshed on the inner side of the driving planetary gear ring. The first driving gear is meshed among the multiple driven gears. An input shaft is fixedly sleeved inside the first driving gear. A second planetary reduction assembly is also sleeved on the outer side of the first driving gear. The second planetary reduction assembly includes a driven planetary gear ring. An input assembly is fixedly installed on the side of the driven planetary gear ring away from the first planetary reduction assembly. One side of the input assembly is fixedly connected to the side wall of the reducer protective cover by bolts. An output assembly is also provided inside the reducer housing. The output assembly includes an output triangle plate and an output cylinder. The inside of the output triangle plate is fixedly connected to one end of the input shaft, and an output cylinder is fixedly connected to one side of the output triangle plate.

[0004] In the planetary gear reducer provided by this patent, the surface of the output cylinder is a smooth structure. When connected to the external actuator, it lacks structures such as keyways and splines to provide reliable circumferential fixation, which easily leads to relative sliding and causes the torque to be unable to be transmitted to the external actuator stably and efficiently. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a planetary gear reducer.

[0006] The objective of this utility model can be achieved through the following technical solution: A planetary gear reducer includes a front housing, a gear ring body, a rear housing, a planetary gear assembly, an input shaft, and an output spline shaft. The front housing, gear ring body, and rear housing are connected in sequence, and the planetary gear assembly is installed inside the front housing, gear ring body, and rear housing. The planetary gear assembly includes planetary gears, a sun gear, and a planet carrier. The planet carrier is generally in the shape of a hollow annular sleeve. A mounting hole is provided in the middle of the planet carrier, and a connecting ring is formed on the rear side of the planet carrier. The mounting hole is located on the front side of the planet carrier. A planetary shaft is installed in the mounting hole. The planetary gear is sleeved on the outside of the planetary shaft and located in the mounting hole. The planetary gear meshes with the inner side of the gear ring body. The sun gear is located inside the planet carrier and meshes with the planetary gear. A keyway groove is formed on the inner side of the connecting ring body on the rear side of the planet carrier. The output spline shaft is connected to the rear side of the planet carrier through the keyway groove. A mounting ring body is formed on the front side of the planet carrier. A gear sleeve is installed inside the mounting ring body. One side of the sun gear meshes with the gear sleeve. The end of the input shaft is gear-shaped and meshes with the gear sleeve.

[0007] In the aforementioned planetary gear reducer, a large bearing is installed on the outside of the connecting ring body, and the outside of the large bearing is connected to the inside of the rear housing.

[0008] In the aforementioned planetary gear reducer, a first bearing, a second bearing, and a washer are fixedly fitted around the outside of the input shaft, with the washer located between the first and second bearings, and the input shaft extending out from one side of the front housing.

[0009] In the aforementioned planetary gear reducer, a connecting keyway is provided inside the output spline shaft.

[0010] Compared with the prior art, the planetary gear reducer provided by this utility model has the following beneficial effects: 1. The output spline shaft is rigidly connected to the planetary carrier through the keyway groove. The internal connecting keyway can be adapted to the external load shaft. Compared with single key or bolt connection, spline connection has a larger contact area and more uniform force distribution, which can transmit torque more accurately, reduce transmission error, and ensure the accuracy of output speed and torque, meeting the requirements of equipment with strict motion control; 2. The keyway groove on the inner side of the connecting ring is adapted to the output spline shaft. The external large bearing cooperates with the rear housing, which not only ensures the rotational stability of the planetary carrier, but also optimizes the force distribution through the support of the large bearing, reduces friction and wear between the planetary carrier and the rear housing, and extends the service life of the components. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0012] Figure 2 This is a schematic cross-sectional view of the present invention;

[0013] Figure 3This is a schematic diagram of the exploded structure of this utility model.

[0014] In the diagram: 1. Front housing; 2. Gear ring body; 3. Rear housing; 4. Planetary gear assembly; 41. Planetary gear; 42. Sun gear; 43. Planetary carrier; 431. Mounting hole; 432. Connecting ring body; 433. Keyway; 434. Mounting ring body; 44. Planetary shaft; 5. Input shaft; 6. Output spline shaft; 61. Connecting keyway; 7. Gear sleeve; 8. Large bearing; 9. First bearing; 10. Second bearing; 11. Washer. Detailed Implementation

[0015] 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.

[0016] like Figures 1 to 3 As shown, this embodiment consists of a front housing 1, a gear ring body 2, a rear housing 3, a planetary gear assembly 4, an input shaft 5, and an output spline shaft 6. The front housing 1, gear ring body 2, and rear housing 3 are connected in sequence by bolts to form a closed reducer housing structure, which provides stable support for the internal planetary gear assembly 4.

[0017] like Figures 1 to 3 As shown, the planetary gear assembly 4 includes a planetary gear 41, a sun gear 42, and a planet carrier 43. The planet carrier 43 is designed as a hollow annular sleeve. A mounting ring 434 is formed on the front side of the planet carrier 43. A mounting hole 431 is opened in the middle of the planet carrier 43. A connecting ring 432 extends from the rear side of the planet carrier 43. Several planetary shafts 44 are installed in the mounting hole 431 in the middle of the planet carrier 43 by interference fit. The planetary gear 41 is sleeved on the outside of the planetary shaft 44 by bearings. The outer side of the planetary gear 41 meshes with the inner tooth surface of the gear ring body 2, and the inner side meshes with the sun gear 42.

[0018] like Figures 1 to 3 As shown, the sun gear 42 is located at the center inside the planetary carrier 43, and the gear sleeve 7 is installed inside the mounting ring 434. One side of the sun gear 42 is meshed with the gear sleeve 7. The end of the input shaft 5 is designed as a gear and meshes with the gear sleeve 7, thereby transmitting external power to the sun gear 42. The inner side of the connecting ring 432 on the rear side of the planetary carrier 43 is machined with a keyway groove 433. The front end of the output spline shaft 6 is rigidly connected to the planetary carrier 43 through the keyway groove 433 to ensure efficient torque transmission.

[0019] like Figures 1 to 3 As shown, a large bearing 8 is installed on the outside of the connecting ring 432. The outer ring of the large bearing 8 is precisely fitted with the inner side of the rear housing 3, which can not only ensure the rotational stability of the planetary carrier 43, but also effectively distribute the radial load and reduce the friction and wear between components.

[0020] To elaborate further, such as Figures 1 to 3 As shown, the input shaft 5 is fitted with a first bearing 9, a washer 11, and a second bearing 10 in sequence. The washer 11 is used to precisely control the bearing clearance. The input shaft 5 extends out of the front housing 1 to connect to the power source.

[0021] To elaborate further, such as Figures 1 to 3 As shown, the output spline shaft 6 has a connecting keyway 61 inside, and the output spline shaft 6 can be reliably connected to the external load shaft through the connecting keyway 61.

[0022] 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.

[0023] 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 planetary gear reducer, comprising a front housing (1), a gear ring body (2), a rear housing (3), a planetary gear assembly (4), an input shaft (5), and an output spline shaft (6), wherein the front housing (1), the gear ring body (2), and the rear housing (3) are connected in sequence and the planetary gear assembly (4) is installed inside the front housing (1), the gear ring body (2), and the rear housing (3), characterized in that: The planetary gear assembly (4) includes a planetary gear (41), a sun gear (42), and a planet carrier (43). The planet carrier (43) is a hollow annular sleeve. A mounting hole (431) is provided in the middle of the planet carrier (43), and a connecting ring (432) is formed on the rear side of the planet carrier (43). A planetary shaft (44) is installed in the mounting hole (431) on the front side of the planet carrier (43). The planetary gear (41) is sleeved on the outside of the planetary shaft (44) and located in the mounting hole (431). The planetary gear (41) meshes with the inner side of the gear ring body (2). The sun gear (42) is located inside the planet carrier (43) and meshes with the planet gear (41). A keyway groove (433) is formed on the inner side of the connecting ring (432) on the rear side of the planet carrier (43). The output spline shaft (6) is connected to the rear side of the planet carrier (43) through the keyway groove (433). A mounting ring (434) is formed on the front side of the planet carrier (43). A gear sleeve (7) is installed inside the mounting ring (434). One side of the sun gear (42) meshes with the gear sleeve (7). The end of the input shaft (5) is gear-shaped and meshes with the gear sleeve (7).

2. The planetary gear reducer according to claim 1, characterized in that: A large bearing (8) is installed on the outside of the connecting ring (432), and the outside of the large bearing (8) is connected to the inside of the rear housing (3).

3. A planetary gear reducer according to claim 1, characterized in that: The input shaft (5) is externally fitted with a first bearing (9), a second bearing (10) and a washer (11), the washer (11) being located between the first bearing (9) and the second bearing (10), and the input shaft (5) extending out of the front housing (1) on one side.

4. A planetary gear reducer according to claim 1, characterized in that: The output spline shaft (6) has a connecting keyway (61) inside.

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