High torque planetary speed reducer

Abstract

The utility model provides a kind of high torque planetary reducer belongs to speed reducer technical field.It solves the torque small technical problem of existing planetary reducer.The high torque planetary reducer, including shell and end cover, inner ring gear is fixedly arranged in shell interior, planetary gear engages sun gear shaft and inner ring gear, planetary gear is set in planet carrier by planet shaft, planet carrier is rotatably connected by first bearing with sun gear shaft;Sun gear shaft is connected with motor output end outside end cover one end;Second bearing is equipped between sun gear shaft and end cover, the other end of sun gear shaft is stretched out outside planet carrier, and is rotatably connected with output shaft by second bearing;Output gear is fixedly installed on planet carrier, output gear is engaged with output gear ring and synchronous belt drive output gear ring rotation, and output gear ring is fixedly connected on output shaft;The other end of output shaft is stretched out outside shell outside.The utility model enhances output torque capacity and overall rigidity, optimizes transmission path, reduces vibration and noise.

Description

Technical Field

[0001] This utility model belongs to the field of speed reducer technology, and specifically refers to a high-torque planetary speed reducer. Background Technology

[0002] Planetary gear reducers, as a common and efficient transmission device, are widely used in industrial robots, precision machine tools, automated equipment, and other applications requiring high torque, high rigidity, and high precision. They achieve power distribution through the multi-tooth meshing of planetary gear trains, and offer advantages such as compact structure, high load-bearing capacity, and smooth transmission.

[0003] In the prior art, planetary gear reducers have various structures and improvements. For example, Chinese invention patent CN116104915A discloses a "planetary gear reducer" that includes a motor connector and a housing. It has a primary and secondary reduction structure inside, achieving two-stage reduction through the meshing of a double planetary gear with a ring gear carrier and the rotation of planetary gears within the housing driven by a sun gear. The output shaft is mounted on an output planetary carrier and outputs power through the meshing of planetary gears with an internal ring gear on a fixed housing. This structure suffers from problems such as indirect torque transmission and insufficient support stiffness, leading to increased vibration and noise, and even affecting lifespan and accuracy. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a high-torque planetary reducer. The technical problem this invention aims to solve is how to enhance output torque capacity and overall rigidity, optimize the transmission path, and reduce vibration and noise.

[0005] The objective of this utility model can be achieved through the following technical solution: A high-torque planetary reducer includes a housing and an end cover. The housing and the end cover are fixedly connected. An internal gear ring is fixedly installed inside the housing. The internal gear ring meshes with planet gears. The planet gears also mesh with a sun gear shaft. The planet gears are rotatably mounted in a planet carrier via the planet shaft. The two ends of the planet carrier are rotatably connected to the sun gear shaft via a pair of first bearings. One end of the sun gear shaft extends outside the end cover and is used to connect to the output end of a motor. A second bearing is provided between the sun gear shaft and the end cover. The other end of the sun gear shaft extends outside the planet carrier and is rotatably connected to an output shaft via the second bearing. An output gear is fixedly installed on the planet carrier. The output gear meshes with the output gear ring and synchronously drives the output gear ring to rotate. The output gear ring is fixedly connected to the output shaft. The other end of the output shaft extends outside the housing.

[0006] In the aforementioned high-torque planetary reducer, the output shaft has an expansion portion at one end near the sun gear shaft. The side end of the expansion portion has an inwardly recessed mounting groove. A second bearing is provided between the mounting groove and one end of the sun gear shaft. The outer periphery of the expansion portion is fixed to the output gear ring by a fixing member.

[0007] In the aforementioned high-torque planetary reducer, the sun gear shaft includes an input section, a first fixed section, a gear section, and a second fixed section. The outer circumferential diameter of the gear section is larger than the outer circumferential diameters of the first and second fixed sections. The outer circumferential diameters of the first and second fixed sections are equal. The outer circumferential diameter of the first fixed section is larger than the outer circumferential diameter of the input section. The input section extends out of the fixed cover, and the fixed cover is fixed to the end cover. The shoulder of the first fixed section is engaged with the inner side of the fixed cover. A first sealing element is provided between the first fixed section and the fixed cover. A second bearing is provided between the first fixed section and the end cover. The second fixed section passes through the planetary carrier and is positioned between the second fixed section and the mounting groove.

[0008] In the aforementioned high-torque planetary reducer, the planet carrier sequentially includes a first mounting part, a second mounting part, and a third mounting part. The first mounting part has a planetary mounting cavity for mounting planetary gears, and the planetary gears are rotatably disposed between the first mounting part and the second mounting part via planetary shafts.

[0009] In the aforementioned high-torque planetary reducer, the third mounting part has an output mounting cavity for mounting an output gear, and the output gear is rotatably disposed between the second mounting part and the third mounting part.

[0010] In the aforementioned high-torque planetary reducer, the output mounting cavity and the planetary mounting cavity are staggered.

[0011] In the aforementioned high-torque planetary reducer, the first mounting part, the second mounting part, and the third mounting part are separately arranged.

[0012] In the aforementioned high-torque planetary reducer, a fixing rod is integrally formed on the output gear, and the fixing rod and nut fix the first mounting part, the second mounting part, and the third mounting part.

[0013] Compared with existing technologies, the technical advantages of this utility model are as follows: 1. Through the torque output path of the planetary carrier, output gear, output gear ring, and output shaft, the output gear is fixed to the planetary carrier and rotates synchronously. Its torque is then fully transmitted to the matched output gear ring through meshing, and finally output through the output shaft fixed to the output gear ring. This significantly increases the bearing contact area of ​​the output path, making the force transmission more direct and uniform, thereby greatly improving the overall torque capacity of the reducer. 2. The two ends of the sun gear shaft are adequately and stably supported by a pair of first and second bearings, forming an optimized structure with support at both ends. This greatly improves the rigidity and rotational accuracy of the sun gear shaft, reducing errors and noise caused by shaft deflection or vibration. 3. The planetary carrier adopts a split design and is locked together by a fixing rod and nut on the output gear. This structure not only facilitates the precise installation and positioning of each planetary gear and output gear, ensuring the accuracy of gear meshing clearance, but also makes the overall structure compact and the axial dimensions well controlled. The output mounting cavity and the planetary mounting cavity are staggered, providing each gear set with an independent and sufficient space layout, avoiding mutual interference, further ensuring the reliability and stability of the transmission, and extending its service life. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the present invention.

[0015] Figure 2 This is an enlarged view of section A of this utility model.

[0016] Figure 3 This is an enlarged view of section B of this utility model.

[0017] Figure 4 This utility model relates to a three-dimensional mounting system for the planetary carrier, planetary gears, and output gear. Figure 1 .

[0018] Figure 5 This utility model relates to a three-dimensional mounting system for the planetary carrier, planetary gears, and output gear. Figure 2 .

[0019] Drawing number markings: 1. Outer shell; 2. End cover; 3. Internal gear ring; 4. Planetary gear; 5. Sun gear shaft; 501. Input section; 502. Fixing part one; 503. Gear section; 504. Fixing part two; 6. Planetary shaft; 7. Planetary carrier; 701. First mounting part; 702. Second mounting part; 703. Third mounting part; 704. Planetary mounting cavity; 705. Output mounting cavity; 8. First bearing; 9. Second bearing; 10. Output gear; 11. Output gear ring; 12. Output shaft; 121. Expansion part; 122. Mounting groove; 13. Third bearing; 14. Fixing cover; 15. Fixing rod; 16. Nut. Detailed Implementation

[0020] 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.

[0021] It should be noted that the descriptions of "up", "down", "left", "right", "top", "bottom", etc. in this utility model are defined based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] according to Figures 1 to 5 As shown, a high-torque planetary reducer includes a housing 1 and an end cover 2. The housing 1 and end cover 2 are fixedly connected. An internal gear ring 3 is fixedly installed inside the housing 1 and is stationary relative to the housing 1. The internal gear ring 3 meshes with planet gears 4, which in turn mesh with a sun gear shaft 5. The planet gears 4 are rotatably mounted in a planet carrier 7 via planet shafts 6. Both ends of the planet carrier 7 are rotatably connected to the sun gear shaft 5 via a pair of first bearings 8. One end of the sun gear shaft 5 extends outside the end cover 2 and is used to connect to the output end of a motor. A second bearing 9 is provided between the sun gear shaft 5 and the end cover 2. The other end of the sun gear shaft 5 extends outside the planet carrier 7 and is rotatably connected to an output shaft 12 via the second bearing 9. An output gear 10 is fixedly mounted on the planet carrier 7. The output gear 10 meshes with an output gear ring 11 and synchronously drives the output gear ring 11 to rotate. The output gear ring 11 is fixedly connected to the output shaft 12. The other end of the output shaft 12 extends outside the housing 1. The output shaft 12 is also rotatably connected to the housing 1 via a third bearing 13. The torque output path of the planetary carrier 7, output gear 10, output gear ring 11 and output shaft 12 is such that the output gear 10 is fixed to the planetary carrier 7 and rotates synchronously, and then its torque is completely transmitted to the matching output gear ring 11 through the meshing relationship, and finally output by the output shaft 12 which is fixed to the output gear ring 11. This significantly increases the bearing contact area of ​​the output path, and the force flow is transmitted more directly and evenly, thereby greatly improving the overall torque capacity of the reducer.

[0023] The output shaft 12 has an expansion portion 121 at one end near the sun gear shaft 5. The side end of the expansion portion 121 has an inwardly recessed mounting groove 122. A second bearing 9 is provided between the mounting groove 122 and one end of the sun gear shaft 5. The outer periphery of the expansion portion 121 is fixed to the output gear ring 11 by a fixing member. The sun gear shaft 5 includes an input section 501, a first fixing section 502, a gear section 503, and a second fixing section 504. The outer diameter of the gear section 503 is larger than the outer diameters of the first fixing section 502 and the second fixing section 504. The outer diameters of the first fixing section 502 and the second fixing section 504 are equal. The outer diameter of the first fixing section 502 is larger than the outer diameter of the input section 501. The input section 501 extends out of the fixing cover 14. The fixing cover 14 is fixed to the end cover 2. The shoulder of the first fixing section 502 is engaged with the inner side of the fixing cover 14. A first seal is provided between the first fixing section 502 and the fixing cover 14. A second bearing 9 is provided between the first fixing section 502 and the end cover 2. The second fixing section 504 passes through the planetary carrier 7 and is positioned between the second fixing section 504 and the mounting groove 122. The two ends of the sun gear shaft 5 are fully and stably supported by a pair of first bearings 8 and second bearings 9, forming an optimized structure with support at both ends. This greatly improves the rigidity and rotational accuracy of the sun gear shaft 5 and reduces errors and noise caused by shaft deflection or vibration.

[0024] The planetary carrier 7 comprises a first mounting portion 701, a second mounting portion 702, and a third mounting portion 703. The first mounting portion 701 has a planetary mounting cavity 704 for mounting planetary gears 4. The planetary gears 4 are rotatably disposed between the first mounting portion 701 and the second mounting portion 702 via a planetary shaft 6. The third mounting portion 703 has an output mounting cavity 705 for mounting an output gear 10. The output gear 10 is rotatably disposed between the second mounting portion 702 and the third mounting portion 703. The output mounting cavity 705 and the planetary mounting cavity 704 are staggered. The axes of the output mounting cavity 705 and the planetary mounting cavity 704 are not aligned but are parallel to each other and are evenly arranged circumferentially around the planetary carrier 7. The first mounting portion 701, the second mounting portion 702, and the third mounting portion 703 are separate components. A fixing rod 15 is integrally formed on the output gear 10, and the fixing rod 15 and a nut 16 fix the first mounting portion 701, the second mounting portion 702, and the third mounting portion 703. One end of the planetary shaft 6 is used to fix the planetary gears 4, and the other end passes through the third mounting part 703 and is fixed with the nut 16. Both the second mounting part 702 and the third mounting part 703 have polygonal fixing grooves near the output gear 10. Polygonal fixing blocks protrude from both ends of the output gear 10, and the polygonal fixing blocks and polygonal fixing grooves are fixedly engaged. The planetary carrier 7 adopts a split design and is locked together by the fixing rod 15 on the output gear 10 and the nut 16. This structure not only facilitates the precise installation and positioning of each planetary gear 4 and the output gear 10, ensuring the accuracy of the gear meshing clearance, but also makes the overall structure compact and the axial dimensions well controlled. The output mounting cavity 705 and the planetary mounting cavity 704 are staggered, providing independent and sufficient space for each gear set, avoiding mutual interference, further ensuring the reliability and stability of the transmission, and extending its service life.

[0025] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection defined by the claims of the present utility model.

Claims

1. A high-torque planetary reducer, comprising a housing (1) and an end cover (2), wherein the housing (1) and the end cover (2) are fixedly connected, an internal gear ring (3) is fixedly disposed inside the housing (1), the internal gear ring (3) meshes with planet gears (4), the planet gears (4) also mesh with a sun gear shaft (5), the planet gears (4) are rotatably disposed in a planet carrier (7) via a planet shaft (6), and both ends of the planet carrier (7) are rotatably connected to the sun gear shaft (5) via a pair of first bearings (8); one end of the sun gear shaft (5) extends outside the end cover (2) for connection to the output end of a motor; characterized in that: A second bearing (9) is provided between the sun gear shaft (5) and the end cover (2). The other end of the sun gear shaft (5) extends out of the planet carrier (7) and is rotatably connected to the output shaft (12) through the second bearing (9). An output gear (10) is fixedly installed on the planet carrier (7). The output gear (10) meshes with the output gear ring (11) and drives the output gear ring (11) to rotate synchronously. The output gear ring (11) is fixedly connected to the output shaft (12). The other end of the output shaft (12) extends out of the outer casing (1).

2. The high-torque planetary reducer according to claim 1, characterized in that: The output shaft (12) has an expansion portion (121) at one end near the sun gear shaft (5). The side end of the expansion portion (121) has an inwardly recessed mounting groove (122). A second bearing (9) is provided between the mounting groove (122) and one end of the sun gear shaft (5). The outer periphery of the expansion portion (121) is fixed to the output gear ring (11) by a fixing member.

3. A high-torque planetary reducer according to claim 2, characterized in that: The sun gear shaft (5) includes an input part (501), a first fixing part (502), a gear part (503), and a second fixing part (504). The outer diameter of the gear part (503) is larger than the outer diameters of the first fixing part (502) and the second fixing part (504). The outer diameters of the first fixing part (502) and the second fixing part (504) are equal. The outer diameter of the first fixing part (502) is larger than the outer diameter of the input part (501). The input part (501) extends out of the fixing cover (14). The fixing cover (14) is fixed outside the end cover (2). The shoulder of the first fixing part (502) is engaged inside the fixing cover (14). A first sealing element is provided between the first fixing part (502) and the fixing cover (14). A second bearing (9) is provided between the first fixing part (502) and the end cover (2). The second fixing part (9) passes through the planetary carrier (7) and is provided between the second fixing part (502) and the mounting groove (122).

4. A high-torque planetary reducer according to any one of claims 1 to 3, characterized in that: The planetary carrier (7) includes a first mounting part (701), a second mounting part (702) and a third mounting part (703) in sequence. The first mounting part (701) has a planetary mounting cavity (704) for mounting planetary gears (4). The planetary gears (4) are rotatably disposed between the first mounting part (701) and the second mounting part (702) via a planetary shaft (6).

5. A high-torque planetary reducer according to claim 4, characterized in that: The third mounting part (703) has an output mounting cavity (705) for mounting an output gear (10), which is rotatably disposed between the second mounting part (702) and the third mounting part (703).

6. A high-torque planetary reducer according to claim 5, characterized in that: The output mounting cavity (705) and the planetary mounting cavity (704) are staggered.

7. A high-torque planetary reducer according to claim 4, characterized in that: The first mounting part (701), the second mounting part (702), and the third mounting part (703) are provided separately.

8. A high-torque planetary reducer according to claim 7, characterized in that: The output gear (10) has an integrally formed fixing rod (15), and the fixing rod (15) and nut (16) fix the first mounting part (701), the second mounting part (702) and the third mounting part (703).

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