Planetary gear reducers and transmission systems

Abstract

This utility model relates to the field of speed reduction transmission technology, and discloses a planetary gear reducer and transmission system. The planetary gear reducer includes a stator, an inner rotor, planetary gears, a fixed gear, and an output gear. The stator has a mounting cavity. The inner rotor is rotatably disposed in the mounting cavity and is coaxially arranged with the stator. The planetary gears are rotatably disposed on the inner rotor. The fixed gear is fixedly connected to the stator. The output gear is coaxially arranged with the fixed gear, and the planetary gears mesh with both the output gear and the fixed gear. The difference in the number of teeth between the fixed gear and the output gear is an integer multiple of the number of planetary gears. This utility model sets the difference in the number of teeth between the fixed gear and the output gear to an integer multiple of the number of planetary gears, ensuring that the planetary gears mesh with the coaxially arranged fixed gear and output gear in real time. The meshing transmission relationship between the planetary gears and the dual gears improves the power performance of the transmission system.

Description

Technical Field

[0001] This utility model relates to the field of speed reduction and transmission technology, specifically to planetary gear reducers and transmission systems. Background Technology

[0002] In the field of industrial transmission, speed reducers, as core devices for achieving speed regulation and torque amplification, are widely used in high-end equipment such as robots, CNC machine tools, new energy vehicles, and construction machinery. Among them, planetary speed reducers, with their significant advantages such as compact structure, high transmission efficiency, strong load-bearing capacity, and large transmission ratio, have become a key component in high-precision transmission scenarios.

[0003] In planetary gear reducers, the reduction ratio (i.e., the transmission ratio) directly determines the effectiveness of its core functions and has a crucial impact on the power performance, operating status, and applicable scenarios of the transmission system. However, the reduction ratio of existing planetary gear reducers is relatively low. In order to pursue higher performance transmission systems, there is an urgent need for a planetary gear reducer with a large reduction ratio. Utility Model Content

[0004] In view of this, the present invention provides a planetary gear reducer and transmission system to solve the problem of low reduction ratio of planetary gear reducers.

[0005] In a first aspect, this utility model provides a planetary gear reducer, comprising a stator, an inner rotor, planetary gears, a fixed gear, and an output gear. The stator has a mounting cavity. The inner rotor is rotatably disposed within the mounting cavity and is coaxially disposed with the stator. The planetary gears are rotatably disposed on the inner rotor, and at least one planetary gear is provided. The fixed gear is fixedly connected to the stator. The output gear is coaxially disposed with the fixed gear, and the planetary gears mesh with both the output gear and the fixed gear. The difference in the number of teeth between the fixed gear and the output gear is an integer multiple of the number of planetary gears.

[0006] Beneficial effects: The difference in the number of teeth between the fixed gear and the output gear is an integer multiple of the number of planetary gears, ensuring that the planetary gears mesh with the coaxial fixed gear and output gear in real time. The meshing transmission relationship between the planetary gears and the double gears has a larger reduction ratio compared to the traditional transmission relationship output through the planetary carrier, resulting in better power performance of the transmission system.

[0007] In one optional embodiment, the inner rotor has a first through hole that penetrates the inner rotor; the stator has a second through hole that penetrates the stator and is corresponding to and connected to the first through hole; the first through hole and the second through hole are suitable for threading cables through them.

[0008] Beneficial effects: By setting up interconnected first and second through holes, it is convenient to run and arrange cables, which can effectively solve the problem of inconvenient wiring and connection when there are many wire harnesses, and improve the overall compactness of the reducer.

[0009] In one optional embodiment, the stator includes a main body and an end cover; the main body is connected to the end cover to enclose and form the mounting cavity, the fixed gear is fixedly connected to the main body, and the second through hole is provided through the end cover.

[0010] Beneficial effects: The separate connection between the main body and the end cap facilitates the assembly and maintenance of various components inside the cavity, reducing the difficulty of production and manufacturing.

[0011] In one alternative embodiment, the planetary gear reducer further includes a first bearing disposed between the inner rotor and the end cover.

[0012] Beneficial effects: By setting the first bearing, the coefficient of friction between the inner rotor and the end cover is reduced, the wear during relative rotation of the two is reduced, the transmission efficiency is guaranteed, and the smoothness of the inner rotor rotation is improved.

[0013] In one optional embodiment, the planetary gear reducer further includes a first fastener and an outer cover; the outer cover has a first mounting hole, and multiple first mounting holes and first fasteners are provided correspondingly, the first fasteners pass through the first mounting holes and are fastened inside the main body, and the outer cover has a third through hole, the third through hole communicating with the second through hole.

[0014] Beneficial effects: The first fastener enables a detachable connection between the main body and the outer cover, facilitating the disassembly, assembly, and maintenance of the planetary gear reducer.

[0015] In one optional embodiment, the planetary gear reducer further includes a second fastener; the stator has a second mounting hole, and multiple second fasteners and second mounting holes are provided correspondingly, with multiple second mounting holes spaced apart along the periphery of the stator, and the second fasteners pass through the second mounting holes and are fastened to the fixed gear.

[0016] Beneficial effects: The stator and fixed gear are detachably connected by the second fastener. Multiple fasteners are set at intervals along the periphery of the stator to ensure connection stability and facilitate the disassembly, assembly and maintenance of the stator and fixed gear.

[0017] In one optional embodiment, the stator is further provided with weight reduction holes, which are spaced apart from the second through hole.

[0018] Beneficial effects: By opening weight-reducing holes on the stator, the weight of the stator can be reduced without affecting the strength of the stator, thus achieving the lightweighting of the planetary gear reducer.

[0019] In one alternative embodiment, the planetary gear reducer further includes a second bearing disposed between the stationary gear and the output gear.

[0020] Beneficial effects: By setting a second bearing, the coefficient of friction between the fixed gear and the output gear is reduced, the wear during relative rotation between the two is reduced, and the transmission efficiency is guaranteed.

[0021] In one alternative embodiment, the planetary gear reducer further includes a third bearing disposed between the output gear and the inner rotor.

[0022] Beneficial effects: By setting a third bearing, the coefficient of friction between the inner rotor and the output gear is reduced, the wear during relative rotation between the two is reduced, and the transmission efficiency is guaranteed.

[0023] Secondly, this utility model also provides a transmission system, including the aforementioned planetary gear reducer. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the overall structure of the planetary gear reducer according to an embodiment of the present utility model;

[0026] Figure 2 This is a side view of the planetary gear reducer according to an embodiment of the present utility model;

[0027] Figure 3 for Figure 2 Schematic diagram of the sectional structure of the middle AA section;

[0028] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure of the middle BB;

[0029] Figure 5 This is a schematic diagram showing the connection between the inner rotor and the planetary gear in an embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram showing the coaxial arrangement of the fixed gear and the output gear in an embodiment of this utility model.

[0031] Figure 7 This is a simplified diagram of the gear structure of the planetary gear reducer according to an embodiment of the present utility model;

[0032] Figure 8 This is a simplified diagram of the gear structure of a planetary gear reducer in related technologies.

[0033] Explanation of reference numerals in the attached figures:

[0034] 10. Stator; 11. Second through hole; 12. Main body; 13. End cover; 14. Weight reduction hole; 20. Inner rotor; 21. First through hole; 30. Planetary gear; 40. Fixed gear; 50. Output gear; 60. First bearing; 70. First fastener; 80. Outer cover; 81. Third through hole; 90. Second fastener; 100. Second bearing; 110. Third bearing; 121. Internal gear ring; 122. Sun gear; 123. Planetary carrier. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] The following is combined Figures 1 to 8 The following describes embodiments of the present invention.

[0037] According to an embodiment of this utility model, a planetary gear reducer is provided, comprising a stator 10, an inner rotor 20, planetary gears 30, a fixed gear 40, and an output gear 50. The stator 10 has a mounting cavity; the inner rotor 20 is rotatably disposed within the mounting cavity and is coaxially arranged with the stator 10; the planetary gears 30 are rotatably disposed on the inner rotor 20, and at least one planetary gear 30 is provided; the fixed gear 40 is fixedly connected to the stator 10; the output gear 50 is coaxially arranged with the fixed gear 40, and the planetary gears 30 mesh with both the output gear 50 and the fixed gear 40; the difference in the number of teeth between the fixed gear 40 and the output gear 50 is an integer multiple of the number of planetary gears 30. The output gear 50 outputs power via the planetary gears 30.

[0038] In the planetary gear reducer of this embodiment, the difference in the number of teeth between the fixed gear 40 and the output gear 50 is an integer multiple of the number of planetary gears 30, ensuring that the planetary gears 30 are meshed with the coaxially arranged fixed gears 40 and output gears 50 in real time. The meshing transmission relationship between the planetary gears 30 and the double gears in the same group has a larger reduction ratio than the traditional transmission relationship output through the planet carrier 123, resulting in better power performance of the transmission system.

[0039] Specifically, in this embodiment, such as Figure 6 As shown, the fixed gear 40 and the output gear 50 are coaxially arranged (i.e., their axes coincide). The fixed gear 40 has fifty-seven teeth, and the output gear 50 has fifty-four teeth, with a difference of three teeth between them. Figure 4 and Figure 5 As shown, there are three planetary gears 30, which are evenly spaced on the inner rotor 20.

[0040] It should be noted that, in other alternative embodiments, the number of teeth of the fixed gear 40 and the number of teeth of the output gear 50 can be adjusted and selected according to the actual required reduction ratio.

[0041] It should be noted that the difference in the number of teeth between the fixed gear 40 and the output gear 50 must be an integer multiple of the number of planetary gears 30 to ensure that the planetary gears 30 can mesh with both the fixed gear 40 and the output gear 50 simultaneously. If the difference in the number of teeth between the fixed gear 40 and the output gear 50 is not an integer multiple of the number of planetary gears 30, meshing interference and jamming will occur when the planetary gears 30 are in transmission with the fixed gears 40 and the output gears 50. This may cause gear tooth breakage in the short term and damage the planetary transmission structure in the long term.

[0042] It should be noted that in related technologies, such as Figure 8 As shown, the sun gear 122 serves as the driving element. The sun gear 122 is connected to the internal gear ring 121 via the planetary gear 30, and the output is ultimately provided by the planet carrier 123. The reduction ratio of this planetary gear reducer is i0 = 1 + Z. r / Z s (where Z) r Z represents the number of teeth on the internal gear ring 121. s (The number of teeth of the sun gear 122), in this application, as... Figure 7 As shown, the inner rotor 20 is directly used as the power input. The planetary gear 30 on the inner rotor 20 simultaneously meshes with the fixed gear 40 and the output gear 50, and finally outputs power through the output gear 50. The reduction ratio of this planetary gear reducer is i = Z. r2 / (Z r2 -Z r1 (where Z) r1 Z is the number of teeth of the output gear 50. r2(For the number of teeth of the fixed gear 40), when Z r =Z r2 Z s =Z r1 At the same time, the reduction ratio of this application is larger than that of the related technology. Therefore, the output torque of this application is greater and the torque output performance of the planetary gear reducer is better.

[0043] In this embodiment, as Figure 3 As shown, the inner rotor 20 has a first through hole 21, which is axially inserted through the inner rotor 20. The stator 10 has a second through hole 11, which is inserted through the stator 10. The second through hole 11 corresponds to and is connected to the first through hole 21. The first through hole 21 and the second through hole 11 are suitable for threading cables.

[0044] It is worth noting that by setting up the interconnected first through hole 21 and second through hole 11, the cable threading and arrangement are facilitated, which can effectively solve the problem of inconvenient wiring and connection when there are many wire harnesses, and improve the overall compactness of the reducer.

[0045] It should be noted that in related technologies, the wiring harness needs to be routed outside the planetary gear reducer. Therefore, when there are many wiring harnesses, it causes inconvenience for wiring, connection, and wiring harness organization. In this application, by opening the first through hole 21 and the second through hole 11, the wiring harness can be easily routed inside the planetary gear reducer, saving space.

[0046] In this embodiment, as Figure 3 As shown, the stator 10 includes a main body 12 and an end cover 13; the main body 12 and the end cover 13 are connected to form an mounting cavity, the fixed gear 40 is fixedly connected to the main body 12, and the second through hole 11 is provided to penetrate the end cover 13 axially.

[0047] It is worth noting that the main body 12 and the end cap 13 are connected separately, which facilitates the assembly and maintenance of various components inside the cavity and reduces the difficulty of manufacturing.

[0048] Furthermore, such as Figure 3 As shown, the planetary gear reducer also includes a first bearing 60; the first bearing 60 is disposed between the inner rotor 20 and the end cover 13.

[0049] It is worth noting that by setting the first bearing 60, the coefficient of friction between the inner rotor 20 and the end cover 13 is reduced, the wear during relative rotation of the two is reduced, the transmission efficiency is ensured, and the smoothness of the rotation of the inner rotor 20 is improved.

[0050] In this embodiment, as Figures 1 to 3As shown, the planetary gear reducer also includes a first fastener 70 and an outer cover 80. The outer cover 80 has a first mounting hole, and multiple first mounting holes and first fasteners 70 are correspondingly provided. The first fasteners 70 pass through the first mounting holes and are fastened within the main body 12. The outer cover 80 has a third through hole 81, which communicates with a second through hole 11. A cavity for mounting a circuit board is formed between the outer cover 80 and the end cover 13.

[0051] It is worth noting that the first fastener 70 enables a detachable connection between the main body 12 and the outer cover 80, facilitating the disassembly and maintenance of the planetary gear reducer.

[0052] It should be noted that the main body 12 and the outer cover 80 can also be connected in other ways, such as by snap-fit.

[0053] In this embodiment, as Figures 1 to 3 As shown, the planetary gear reducer also includes a second fastener 90; a second mounting hole is provided on the stator 10, and multiple second fasteners 90 and second mounting holes are provided correspondingly. Multiple second mounting holes are spaced apart along the periphery of the stator 10, and the second fasteners 90 pass through the second mounting holes and are fastened in the fixed gear 40.

[0054] Specifically, the second mounting hole is opened on the main body 12, and multiple second mounting holes are evenly spaced along the periphery of the stator 10 to ensure that the connection between the fixed gear 40 and the main body 12 is balanced and to ensure service life.

[0055] It is worth noting that the stator 10 and the fixed gear 40 are detachably connected by the second fastener 90. Multiple fasteners are set at intervals along the periphery of the stator 10 to ensure connection stability and facilitate the disassembly, assembly and maintenance of the stator 10 and the fixed gear 40.

[0056] Furthermore, such as Figure 4 As shown, the stator 10 is also provided with a weight reduction hole 14, which is spaced apart from the second through hole 11.

[0057] It is worth noting that by opening weight-reducing holes 14 on the stator 10, the weight of the stator 10 can be reduced without affecting its strength, thus achieving the lightweighting of the planetary gear reducer.

[0058] In this embodiment, as Figure 1 and Figure 3 As shown, the planetary gear reducer also includes a second bearing 100; the second bearing 100 is disposed between the fixed gear 40 and the output gear 50.

[0059] It is worth noting that by setting the second bearing 100, the coefficient of friction between the fixed gear 40 and the output gear 50 is reduced, thereby reducing wear when the two rotate relative to each other and ensuring transmission efficiency.

[0060] In one embodiment, such as Figure 3 As shown, the planetary gear reducer also includes a third bearing 110; the third bearing 110 is disposed between the output gear 50 and the inner rotor 20.

[0061] It is worth noting that by setting the third bearing 110, the coefficient of friction between the inner rotor 20 and the output gear 50 is reduced, thereby reducing wear when the two rotate relative to each other and ensuring transmission efficiency.

[0062] Working principle: After the planetary gear reducer is powered on, the inner rotor 20 rotates, which drives the planetary gear 30 to rotate. The planetary gear 30 meshes with the fixed gear 40 and the output gear 50 at the same time. The output gear 50 is connected to the external structure to realize power output.

[0063] According to an embodiment of the present invention, in a second aspect, a transmission system is also provided, including the planetary gear reducer described above.

[0064] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A planetary gear reducer characterized by, include: Stator (10), wherein the stator (10) has an mounting cavity; An inner rotor (20) is rotatably disposed within the mounting cavity, and the inner rotor (20) is coaxially disposed with the stator (10); Planetary gear (30), which is rotatably disposed on the inner rotor (20), and at least one planetary gear (30) is provided; A fixed gear (40) is fixedly connected to the stator (10); The output gear (50) is coaxially arranged with the fixed gear (40), and the planetary gear (30) meshes with both the output gear (50) and the fixed gear (40); the difference in the number of teeth between the fixed gear (40) and the output gear (50) is an integer multiple of the number of planetary gears (30).

2. The planetary gear reducer according to claim 1, characterized in that, The inner rotor (20) has a first through hole (21) that passes through the inner rotor (20); the stator (10) has a second through hole (11) that passes through the stator (10) and is connected to the first through hole (21); the first through hole (21) and the second through hole (11) are suitable for threading cables through them.

3. The planetary gear reducer according to claim 2, characterized in that, The stator (10) includes a main body (12) and an end cap (13); the main body (12) and the end cap (13) are connected to form the mounting cavity, the fixed gear (40) is fixedly connected to the main body (12), and the second through hole (11) is provided through the end cap (13).

4. The planetary gear reducer according to claim 3, characterized in that, The planetary gear reducer also includes a first bearing (60); the first bearing (60) is disposed between the inner rotor (20) and the end cover (13).

5. The planetary gear reducer according to claim 3, characterized in that, The planetary gear reducer also includes a first fastener (70) and an outer cover (80); the outer cover (80) is provided with a first mounting hole, and multiple first mounting holes and first fasteners (70) are provided accordingly. The first fasteners (70) pass through the first mounting holes and are fastened in the main body (12). The outer cover (80) is provided with a third through hole (81), and the third through hole (81) communicates with the second through hole (11).

6. The planetary gear reducer according to any one of claims 1-4, characterized in that, The planetary gear reducer also includes a second fastener (90); the stator (10) is provided with a second mounting hole, and multiple second fasteners (90) and second mounting holes are provided correspondingly. Multiple second mounting holes are spaced apart along the periphery of the stator (10), and the second fasteners (90) pass through the second mounting holes and are fastened in the fixed gear (40).

7. The planetary gear reducer according to any one of claims 2-4, characterized in that, The stator (10) is also provided with a weight reduction hole (14), which is spaced apart from the second through hole (11).

8. The planetary gear reducer according to any one of claims 1-4, characterized in that, The planetary gear reducer also includes a second bearing (100); the second bearing (100) is disposed between the fixed gear (40) and the output gear (50).

9. The planetary gear reducer according to any one of claims 1-4, characterized in that, The planetary gear reducer also includes a third bearing (110); the third bearing (110) is disposed between the output gear (50) and the inner rotor (20).

10. A transmission system, characterized in that, include: The planetary gear reducer according to any one of claims 1 to 9.

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