Planetary gear set speed reducer

Abstract

The utility model discloses a planetary gear set speed reducer which comprises a shell, a gear ring fixedly arranged in the shell, a sun gear rotationally arranged in the shell and a plurality of planet gears, each planet gear is in meshed contact with the sun gear and the gear ring, two planet carriers are arranged in the shell, and the planet carriers are meshed with the sun gear and the gear ring. The planet wheel is rotatably arranged between the two planet carriers, one planet carrier is fixedly connected with an output shaft, the output shaft penetrates out of the shell, a plurality of main fins are fixedly embedded in the top of the shell, and the lower ends of the main fins extend into the shell. According to the heat exchanger, the connecting fins are arranged between the tops of the main fins, the surface area in contact with air is directly increased, and the heat exchange efficiency is improved; the low-power-consumption fan is arranged near the main fins and the connecting fins, so that the natural convection efficiency can be improved, and the heat dissipation efficiency is improved; the fan is parallel to the direction of the fins and directly pushes airflow to pass through gaps of the fins (the airflow is prevented from being blocked due to vertical blowing).

Description

Technical Field

[0001] This utility model relates to the field of gear reducer technology, specifically a planetary gear reducer. Background Technology

[0002] Planetary gear reducers are speed reduction devices composed of planetary gear transmission mechanisms. With their small size, high transmission efficiency, and strong load-bearing capacity, they are widely used in machinery manufacturing, automation equipment, automotive industry and other fields.

[0003] Fins are typically installed on the surface of the gearbox housing. The heat is carried away by the fins through natural airflow (hot air rising). Although the traditional method of cooling the gearbox through heat dissipation fins is simple in structure and low in cost, it has obvious limitations in practical applications, especially in high-load, high-temperature or compact space scenarios. Even if the fin surface area is large, the speed at which heat is conducted from the gear meshing area to the housing may not keep up with the heating rate. In a closed space or without airflow (such as inside a cabinet), the heat dissipation capacity drops sharply. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a planetary gear reducer, which solves the problems mentioned in the background section.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a planetary gear reducer, comprising a housing, a gear ring fixedly disposed inside the housing, a sun gear rotatably disposed inside the housing, and multiple planet gears, each planet gear meshing with the sun gear and the gear ring. Two planet carriers are disposed inside the housing, and the planet gears are rotatably disposed between the two planet carriers. An output shaft is fixedly connected to one of the planet carriers, extending through to the outside of the housing. Multiple main fins are fixedly embedded in the top of the housing, with the lower end of each main fin extending into the housing and the upper end extending out of the housing. A connecting fin is fixedly connected between the upper ends of two adjacent main fins. A protective assembly is provided on the top of the housing, and a fan for cooling the main fins and connecting fins is provided on the protective assembly.

[0008] Preferably, the protective component includes a top protective frame and positioning pins fixed to the bottom of the top protective frame, wherein a mounting bracket is fixedly connected between two of the positioning pins, and the fan is fixedly mounted on the mounting bracket.

[0009] Preferably, four rectangularly distributed positioning sleeves are fixedly connected to the top of the housing, and the positioning pins are inserted into the positioning sleeves.

[0010] Preferably, a drive shaft is fixedly connected to the end of the sun gear away from the output shaft, and a drive gear is fixedly connected to the end of the drive shaft away from the output shaft. A drive gear is provided inside the housing, and the drive gear meshes with the drive gear. An input shaft is fixedly connected to one end of the drive gear, and one end of the input shaft extends through to the outside of the housing.

[0011] Preferably, each of the planetary gears has the same specifications, and the diameter of the sun gear is smaller than the diameter of the planetary gears.

[0012] Preferably, the housing is provided with multiple bearings fixedly embedded inside, and the output shaft, input shaft and transmission shaft are all inserted into the inner ring of the corresponding bearings.

[0013] (III) Beneficial Effects

[0014] This utility model provides a planetary gear reducer, which has the following advantages:

[0015] 1. In this utility model, connecting fins are provided between the top of the main fins to directly increase the surface area in contact with air and improve heat exchange efficiency; a low-power fan is provided near the main fins and connecting fins to improve natural convection efficiency, thereby improving heat dissipation efficiency. No large heat sink is required, making it suitable for compact reducers; the fan is parallel to the fin direction and directly pushes the airflow through the fin gaps (avoiding vertical airflow that would cause the airflow to be blocked).

[0016] 2. In this utility model, an external motor is connected to the input shaft via a coupling and drives the drive gear to rotate. The drive gear drives the transmission gear to rotate, and the transmission gear drives the sun gear to rotate via the transmission shaft. Since each planet gear meshes with the sun gear and the ring gear, it drives each planet gear to revolve around the sun gear and rotate on its own axis. Each planet gear jointly drives the planet carrier and the output shaft to rotate, thereby achieving the purpose of deceleration. The rotation (around its own axis) and revolution (around the sun gear) of the planet gears are coupled, resulting in the output shaft and the planet carrier rotating at a speed lower than that of the sun gear. Multiple planet gears mesh simultaneously, sharing the load, making the transmission smoother and the load-bearing capacity higher (compared to ordinary gearboxes). Attached Figure Description

[0017] Figure 1 This is a front-view perspective view of a planetary gear reducer proposed in this utility model;

[0018] Figure 2 for Figure 1 Left-view cross-sectional structural diagram;

[0019] Figure 3 for Figure 1 Front view sectional structural diagram;

[0020] Figure 4 for Figure 1 Right-side cross-sectional structural diagram;

[0021] Figure 5 for Figure 1 Enlarged structural diagram at point A;

[0022] Figure 6 This is a partial structural diagram of a planetary gear reducer proposed in this utility model.

[0023] In the diagram: 1. Housing; 2. Sun gear; 3. Planet gear; 4. Gear ring; 5. Planet carrier; 6. Output shaft; 7. Drive shaft; 8. Drive gear; 9. Drive gear; 10. Input shaft; 11. Main fin; 12. Connecting fin; 13. Positioning sleeve; 14. Top protective frame; 15. Positioning pin; 16. Mounting bracket; 17. Fan. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Please see Figures 1 to 6 This utility model provides a technical solution: a planetary gear reducer, including a housing 1, a gear ring 4 fixedly disposed inside the housing 1, a sun gear 2 rotatably disposed inside the housing 1, and multiple planet gears 3. Each planet gear 3 is meshed with the sun gear 2 and the gear ring 4. Two planet carriers 5 are disposed inside the housing 1, and the planet gears 3 are rotatably disposed between the two planet carriers 5. An output shaft 6 is fixedly connected to one of the planet carriers 5, and the output shaft 6 extends through to the outside of the housing 1. Multiple main fins 11 are fixedly embedded in the top of the housing 1. The lower end of the main fins 11 extends into the housing 1, and the upper end extends to the outside of the housing 1. A connecting fin 12 is fixedly connected between the upper ends of two adjacent main fins 11. A protective assembly is disposed on the top of the housing 1, and a fan 17 for heat dissipation of the main fins 11 and the connecting fins 12 is disposed on the protective assembly.

[0026] Connecting fins 12 are arranged between the top of the main fins 11 to directly increase the surface area in contact with air and improve heat exchange efficiency. Low-power fans 17 are arranged near the main fins 11 and connecting fins 12 to improve natural convection efficiency, thereby improving heat dissipation efficiency. No large heat sink is required, making it suitable for compact reducers. The fans 17 are parallel to the fin direction and directly push airflow through the gaps between the fins (avoiding vertical airflow that would block the airflow).

[0027] Each planetary gear 3 revolves around the sun gear 2 and rotates on its own axis. The planetary gears 3 together drive the planet carrier 5 and the output shaft 6 to rotate, so that the speed of the output shaft 6 is less than the speed of the sun gear 2, thus achieving the purpose of speed reduction.

[0028] Reference Figure 5 and Figure 6 The protective assembly includes a top protective frame 14 and positioning pins 15 fixed to the bottom of the top protective frame 14, wherein a mounting bracket 16 is fixedly connected between the two positioning pins 15, and the fan 17 is fixedly mounted on the mounting bracket 16.

[0029] The top protective frame 14 and multiple positioning pins 15 can separate the top of the main fin 11 and the connecting fin 12. Since the top of the main fin 11 and the connecting fin 12 has a high temperature, it prevents fingers from directly touching the high-temperature fins. The airflow generated by the fan 17 passes through the gaps between the fins and carries away the heat to achieve heat dissipation. The fan 17 adopts a detachable installation method, such as screw fixing.

[0030] Reference Figure 5 and Figure 6 Four rectangular positioning sleeves 13 are fixedly connected to the top of the housing 1, and positioning pins 15 are inserted into the positioning sleeves 13.

[0031] During installation, each positioning pin 15 is inserted into the positioning sleeve 13 with a transition fit, ensuring centering, removability, and appropriate tension. At the same time, the top protective frame 14 can be disassembled to clean the top of the main fin 11 and connecting fin 12 in a timely manner. In addition, bolts can be installed on the positioning sleeve 13 to lock the positioning pins 15 inserted inside, ensuring the installation stability of the protective component.

[0032] Reference Figure 2 and Figure 3 The end of the sun gear 2 away from the output shaft 6 is fixedly connected to the drive shaft 7. The end of the drive shaft 7 away from the output shaft 6 is fixedly connected to the drive gear 8. The housing 1 is provided with a drive gear 9, which meshes with the drive gear 8. One end of the drive gear 9 is fixedly connected to the input shaft 10, and one end of the input shaft 10 extends through to the outside of the housing 1.

[0033] An external motor is connected to the input shaft 10 via a coupling and drives the drive gear 9 to rotate. The drive gear 9 drives the transmission gear 8 to rotate, and the transmission gear 8 drives the sun gear 2 to rotate via the transmission shaft 7. Since each planet gear 3 meshes with the sun gear 2 and the ring gear 4, it drives each planet gear 3 to revolve around the sun gear 2 and rotate on its own axis. Each planet gear 3 together drives the planet carrier 5 and the output shaft 6 to rotate, thus achieving the purpose of speed reduction. The rotation (around its own axis) and revolution (around the sun gear 2) of the planet gear 3 are coupled, resulting in the output shaft 6 and the planet carrier 5 rotating at a speed lower than that of the sun gear 2. Multiple planet gears 3 mesh simultaneously, sharing the load, making the transmission smoother and the load-bearing capacity higher (compared to ordinary gearboxes).

[0034] Reference Figure 2Each planetary gear 3 has the same specifications, and the diameter of the sun gear 2 is smaller than the diameter of the planetary gear 3.

[0035] The smaller diameter of the sun gear 2 allows for the arrangement of more planet gears 3. With 3-4 planet gears 3 meshing simultaneously, the torque capacity is increased by 3-4 times. Planet gears 3 of the same specification ensure even load distribution.

[0036] In addition, multiple bearings are fixedly embedded inside the housing 1, and the output shaft 6, input shaft 10, and transmission shaft 7 are all inserted into the inner rings of the corresponding bearings.

[0037] The bearing constrains the radial runout of the shaft (such as deep groove ball bearings restricting radial displacement), ensuring that the meshing center distance of each gear is constant; only the rotational degree of freedom of the shaft about its own axis is retained, while other degrees of freedom are restricted. In addition, the friction coefficient of rolling bearings is much lower than that of sliding bearings, reducing power loss.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A planetary gear reducer, characterized in that: The device includes a housing (1), a gear ring (4) fixedly disposed inside the housing (1), a sun gear (2) rotatably disposed inside the housing (1), and multiple planet gears (3). Each planet gear (3) meshes with the sun gear (2) and the gear ring (4). Two planet carriers (5) are disposed inside the housing (1). The planet gears (3) are rotatably disposed between the two planet carriers (5). An output shaft (6) is fixedly connected to one of the planet carriers (5). The output shaft (6) extends through to the outside of the housing (1). Multiple main fins (11) are fixedly embedded on the top of the housing (1). The lower end of the main fins (11) extends into the housing (1), and the upper end extends to the outside of the housing (1). A connecting fin (12) is fixedly connected between the upper ends of two adjacent main fins (11). A protective assembly is disposed on the top of the housing (1). A fan (17) for heat dissipation of the main fins (11) and the connecting fins (12) is disposed on the protective assembly.

2. The planetary gear reducer according to claim 1, characterized in that: The protective assembly includes a top protective frame (14) and positioning pins (15) fixed to the bottom of the top protective frame (14), wherein a mounting bracket (16) is fixedly connected between the two positioning pins (15), and the fan (17) is fixedly mounted on the mounting bracket (16).

3. A planetary gear reducer according to claim 2, characterized in that: The top of the housing (1) is fixedly connected with four rectangularly distributed positioning sleeves (13), and the positioning pins (15) are inserted into the positioning sleeves (13).

4. A planetary gear reducer according to claim 1, characterized in that: The sun gear (2) is fixedly connected to a drive shaft (7) at one end away from the output shaft (6), and a drive gear (8) is fixedly connected to the other end of the drive shaft (7) away from the output shaft (6). A drive gear (9) is provided inside the housing (1), and the drive gear (9) meshes with the drive gear (8). An input shaft (10) is fixedly connected to one end of the drive gear (9), and one end of the input shaft (10) extends through to the outside of the housing (1).

5. A planetary gear reducer according to claim 1, characterized in that: Each of the planetary gears (3) has the same specifications, and the diameter of the sun gear (2) is smaller than the diameter of the planetary gears (3).

6. A planetary gear reducer according to claim 1, characterized in that: The housing (1) is provided with multiple bearings fixedly embedded inside, and the output shaft (6), input shaft (10) and transmission shaft (7) are all inserted into the inner ring of the corresponding bearings.

Images