A combined two-stage speed reduction device

Abstract

This invention relates to a combined two-stage reduction gear, comprising a base, an input wheel, an output wheel, and a first reduction transmission structure. The drive mechanism includes at least two independent drive components, which are connected to the input wheel via a second reduction transmission structure. The input and output wheels are each equipped with a gear ring that receives power through a meshing structure, and several individual teeth are detachably assembled to form the corresponding gear ring. This invention uses a splicing method to combine multiple teeth to form a complete gear ring. The input and output wheels receive power from upstream through meshing structures. By using a splicing method, the gear ring structure is made more flexible, eliminating the need for specialized large-scale gear-making equipment. Large and ultra-large reduction gears can be manufactured using general-purpose equipment, which not only facilitates the processing and manufacturing of large gear rings but also improves the accuracy of the resulting tooth pitch and tooth profile. The combined drive of multiple independent drive components significantly reduces the requirements for power equipment and manufacturing costs.

Description

Technical Field

[0001] This invention relates to the field of gear reduction device technology, specifically a combined two-stage reduction device. Background Technology

[0002] Currently, reduction structures based on the principle of low tooth difference reduction are relatively mature in existing technologies.

[0003] The applicant's earlier application CN202211555299.8, "A Combined Reducer," provides a structure for transmission via rolling meshing. This structure includes a base, an input planar impeller, an output planar gear, a movable gear assembly, and a compression spring. The input planar impeller drives the movable gear assembly to oscillate up and down, thereby driving the output planar gear to perform a deceleration motion. The input planar impeller has a circumferentially arranged wave-shaped structure. The lower surface of this wave-shaped structure rolls into contact with the upper end of the movable gear assembly. When the input planar impeller rotates, the lower surface of the wave-shaped structure pushes the movable gear assembly to form continuous circumferential oscillations. The lower end of the movable gear assembly rolls into contact with the teeth of the output planar gear.

[0004] The aforementioned reducer employing a live-tooth structure eliminates the interference problem of rigid meshing between existing teeth, improves the stability of force transmission, and achieves balanced output of torque and power. Simultaneously, eliminating meshing interference also reduces the difficulty of tooth modification. Since the gear ring on the output plane gear is directly machined, it has significant advantages for use in small reduction devices. However, when manufacturing large or ultra-large reduction devices, numerous individual teeth must be machined onto the large gear. These individual teeth have stringent requirements regarding pitch and profile, and existing gear manufacturing equipment and processes present many constraints and difficulties, resulting in low manufacturing precision of the gear ring and impacting transmission performance.

[0005] Therefore, further improvements are needed for the current large-scale deceleration structure. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a combined two-stage reduction device that is easy to process and manufacture large gear rings and has high precision in tooth pitch and tooth profile, thereby improving the transmission effect, in view of the current situation of the prior art.

[0007] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0008] A combined two-stage speed reduction device, comprising:

[0009] Matrix;

[0010] An input wheel is rotatably mounted on the top of the base and is used to connect to the drive mechanism;

[0011] An output wheel is rotatably mounted at the bottom of the base for connecting to the device to be driven;

[0012] The first reduction gear transmission structure is connected between the input wheel and the output wheel;

[0013] It also includes: the drive mechanism is connected to the input wheel through a second reduction transmission structure, the input wheel and the output wheel are provided with gear rings that receive power through a meshing structure, and several individual teeth are detachably assembled to form corresponding gear rings.

[0014] In this invention, the upper surface of the input wheel is provided with a first gear ring with the tooth ends facing upwards. The first gear ring includes a plurality of first teeth arranged sequentially along the circumference of the input wheel. By splicing the first gear ring with a plurality of first teeth, large and super-large speed reduction devices can be manufactured using general-purpose equipment without the need for specialized large-scale gear-making equipment. This has significant practical and economic implications for the manufacture of large-scale speed reduction equipment.

[0015] Preferably, the first tooth comprises a first cylindrical portion, a sector-shaped block portion, and a first tooth-shaped portion connected sequentially from bottom to top. The upper surface of the input wheel has an annular groove arranged circumferentially. The bottom wall of the annular groove has a first insertion hole for the first cylindrical portion to be inserted. The sector-shaped block portion is accommodated in the annular groove and is radially larger on the outside and smaller on the inside, thus matching the inner and outer walls of the annular groove. The first tooth-shaped portion protrudes above the annular groove, and a tooth groove is formed between the first tooth-shaped portions of two adjacent first teeth. Using this structure, a first tooth ring with good overall integrity can be assembled to adapt to the annular structure of the input component.

[0016] As an improvement, the annular groove is filled with epoxy resin to fill the gaps. After the epoxy resin is filled but not yet cured, the drive unit is operated to adjust the meshing surface through its meshing with the first gear ring. If existing gear-making equipment is used to manufacture the first gear ring, the tooth adjustment is actually very difficult and precise. However, this invention utilizes the gaps between the spliced ​​first gear rings (there is some adjustability between each first tooth). Before the annular resin cures, the drive unit is operated, and the output gear on the drive unit meshes with the first gear ring to adjust the meshing surface, achieving a high-precision tooth adjustment effect. Simultaneously, after the tooth adjustment is completed, the cured epoxy resin fixes the first gear ring into a single unit, ensuring good reliability.

[0017] Preferably, the drive mechanism includes at least two independent drive members, which are located beside the input wheel and have their output shafts extending radially upwards from the input wheel towards the first gear ring. A gear capable of meshing with the first gear ring is connected to the output shaft of each drive member. This gear, together with the first gear ring, constitutes the second reduction transmission structure. Existing large-scale reduction devices require large power equipment, and manufacturing a single large power unit is not only difficult but also very costly. This invention uses multiple independent drive members to drive the input wheel through a reduction transmission structure, which not only facilitates single-stage reduction but also reduces the power equipment requirements and manufacturing costs.

[0018] In this invention, the upper surface of the output wheel is provided with a second gear ring with the tooth ends facing upwards. The second gear ring includes a plurality of second teeth arranged sequentially along the circumference of the output wheel. By splicing the second gear ring with a plurality of second teeth, large and super-large reduction devices can be manufactured using general-purpose equipment without the need for specialized large-scale gear-making equipment. This has significant practical and economic implications for the manufacture of large-scale reduction equipment.

[0019] Preferably, the second tooth comprises a second cylindrical portion and a second toothed portion connected sequentially from bottom to top. A second insertion hole is provided on the upper surface of the output wheel for the second cylindrical portion to be inserted. The second toothed portion is located above the upper surface of the output wheel, and a tooth groove is formed between the second toothed portions of two adjacent second teeth. Using this structure, a second toothed ring with good overall integrity can be assembled to fit the annular structure of the output component.

[0020] As an improvement, a sliding sleeve is provided in the second socket, close to the inner wall of the second socket. The second cylindrical portion is inserted into the sliding sleeve. In the assembled state, there is a gap between the inner wall of the sliding sleeve and the outer wall of the second cylindrical portion. The gap allows for a small-angle tooth deflection between the second teeth, thereby improving the fit of the meshing surfaces, reducing friction, and meeting the requirements of high loads.

[0021] Preferably, the inner circumferential wall of the sliding sleeve has multiple recesses arranged circumferentially and extending radially, and a raised ridge is formed between adjacent recesses to mate with the outer wall surface of the second cylindrical portion. This structure helps to improve the constraint accuracy of the sliding sleeve on the second tooth.

[0022] As an improvement, the second cylindrical portion has a notch extending upward from the bottom wall, and the bottom of the second insertion hole is provided with an inverted U-shaped elastic element. The upper part of the elastic element is accommodated in the notch, and the closed end abuts against the top of the notch. The lower end of the elastic element is constrained by the bottom wall of the second insertion hole. The aforementioned elastic element allows the second tooth to maintain its axial posture along the second cylindrical portion. When the first reduction gear mechanism above the second tooth meshes with the second tooth, it pushes the second tooth to make a small-angle tooth direction deflection, so that the lower end of the first reduction gear mechanism's generatrix is ​​always in straight contact with the planar tooth profile of the second tooth, thereby reducing interference and friction and improving the transmission effect.

[0023] Preferably, the notch is an inverted V-shape, and the closed end of the V-shape transitions through an arc surface. The bottom wall of the second insertion hole has first and second limiting holes arranged radially at intervals along the output wheel to mate with the open end of the U-shaped structure. This structure facilitates improved limiting effect on the elastic element.

[0024] To facilitate the restriction of the vertical position of the second tooth, the upper surface of the output wheel is also provided with a pressure plate for constraining the second tooth on the output wheel. The pressure plate consists of multiple plates arranged at intervals along the circumference of the output wheel. The side of the second tooth-shaped portion is provided with an outwardly extending pressure edge. The pressure plate is locked to the output wheel by screws and has a clamping groove on its inner side to hold the pressure edge.

[0025] In this invention, the input wheel is an input planar impeller, and the lower surface of the input planar impeller is provided with a waveform structure arranged circumferentially and with varying heights. The waveform structure includes at least two downward protrusions. The output wheel is an output planar gear.

[0026] Preferably, the first reduction transmission structure includes a movable tooth assembly and a compression spring. The movable tooth assembly is movably constrained within the base, with its upper end rolling into the lower surface of the wave-shaped structure and its lower end rolling into the second gear ring of the output plane gear. The number of movable tooth assemblies is greater than the number of the second tooth on the output plane gear. The compression spring is located within the base, ensuring that the movable tooth assembly always maintains a tendency to contact the wave-shaped structure at its upper end. This movable tooth assembly structure allows the movable teeth to maintain a rigid structure while enabling rolling engagement with the gears, eliminating existing tooth-to-tooth meshing interference problems, thereby improving load-bearing capacity and achieving a balanced output of torque and power in the reduction device.

[0027] Compared with the prior art, the advantages of the present invention are as follows: The present invention forms a complete gear ring by splicing multiple teeth together, and the gear ring is respectively set on the input wheel and the output wheel, thereby receiving power from the upstream through the meshing structure; The present invention makes the gear ring structure movable by splicing, eliminating the need for special large gear making equipment, and large and super large reduction devices can be manufactured using general equipment, which not only facilitates the processing and manufacturing of large gear rings, but also helps to improve the accuracy of the resulting tooth pitch and tooth profile; The drive mechanism uses multiple independent drive components to combine and drive, which greatly reduces the requirements of the power equipment and the manufacturing cost. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0029] Figure 2 for Figure 1 A structural diagram from another angle;

[0030] Figure 3 This is a cross-sectional view of an embodiment of the present invention;

[0031] Figure 4 for Figure 3 Enlarged view of section A;

[0032] Figure 5 This is an assembly diagram of the first gear ring and the input wheel in an embodiment of the present invention;

[0033] Figure 6 This is an assembly diagram of the second gear ring and the output wheel in an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the input wheel in an embodiment of the present invention;

[0035] Figure 8 This is a structural schematic diagram of the input wheel from another angle in an embodiment of the present invention. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0037] like Figures 1-8As shown, the combined two-stage reduction device of this embodiment includes a base 1, an input wheel 2, an output wheel 3, a first reduction transmission structure, and a second reduction transmission structure. The input wheel 2 is rotatably mounted on the top of the base 1 for connection to the drive mechanism, and the output wheel 3 is rotatably mounted on the bottom of the base 1 for connection to the device to be driven. The first reduction transmission structure is connected between the input wheel 2 and the output wheel 3. The drive mechanism includes at least two independent drive components 9; in this embodiment, six are provided. The drive components 9 are connected to the input wheel through the second reduction transmission structure 90. The input wheel and the output wheel are provided with gear rings that receive power through meshing structures, and several individual teeth are detachably assembled to form corresponding gear rings.

[0038] For ease of explanation, in this embodiment, the input wheel 2 adopts the input planar impeller from the applicant's prior application CN202211555299.8, the output wheel 3 adopts the output planar gear from the applicant's prior application CN202211555299.8, and the first reduction transmission structure adopts the movable gear assembly 4 and compression spring 5 from the applicant's prior application CN202211555299.8. It should be emphasized that the technical concept of movable gears in this invention can be independently implemented and achieve the corresponding technical effects even without using the aforementioned input planar impeller, output planar gear, movable gear assembly 4, and compression spring 5.

[0039] In this embodiment, as Figure 3 , 5 As shown, the upper surface of the input wheel 2 is provided with a first gear ring 21' with the tooth ends facing upwards. The first gear ring 21' includes a plurality of first teeth 211' arranged sequentially along the circumference of the input wheel 2. By splicing the first gear ring 21' with a plurality of first teeth 211', large and super-large reduction devices can be manufactured using general equipment without the need for special large gear-making equipment. This has significant practical and economic significance for the manufacture of large reduction equipment.

[0040] The first tooth 21' includes a first cylindrical portion 2111, a sector-shaped block portion 2112, and a first tooth-shaped portion 2113 connected sequentially from bottom to top. An annular groove 22' arranged circumferentially is formed on the upper surface of the input wheel 2. The bottom wall of the annular groove 22' has a first insertion hole 221' for the first cylindrical portion 2111 to be inserted into. The sector-shaped block portion 2112 is accommodated in the annular groove 22' and is radially larger on the outside and smaller on the inside, thus matching the inner and outer walls of the annular groove 22'. The first tooth-shaped portion 2113 protrudes above the annular groove 22', and a tooth groove is formed between the first tooth-shaped portions 2113 of two adjacent first teeth 211'. Using this structure, a first tooth ring 21' with good overall integrity can be assembled to fit the annular structure of the input component 2.

[0041] The annular groove 22' is filled with epoxy resin for filling gaps. After the epoxy resin is filled but not yet cured, the drive unit 9 is operated to modify the meshing surface through its meshing transmission with the first gear ring 21'. If the first gear ring is manufactured using existing gear-making equipment, the tooth modification is actually very difficult and it is hard to achieve precision. However, this invention utilizes the gaps between the spliced ​​first gear rings (there is a certain degree of adjustability between each first tooth). Before the annular resin is cured, the drive unit is operated to modify the meshing surface through the meshing transmission between the output gear on the drive unit and the first gear ring, achieving a high-precision tooth modification effect. At the same time, after the tooth modification is completed, the cured epoxy resin fixes the first gear ring into a whole, which has good reliability.

[0042] like Figure 3 As shown, in this embodiment, the driving component 9 is a motor, located beside the input wheel 2, with its output shaft 91 extending radially upwards from the input wheel 2 towards the first gear ring 21'. A gear 92, capable of meshing with the first gear ring 21', is connected to the output shaft 91 of the driving component 9. This gear 92 and the first gear ring 21' together constitute the second reduction transmission structure. For large construction equipment, using multiple independent driving components 9 to drive the input wheel through a reduction transmission structure not only facilitates single-stage reduction but also reduces power equipment requirements and manufacturing costs.

[0043] In this embodiment, as Figure 3 , 6 As shown, the upper surface of the output wheel 3 is provided with a second gear ring 31' with the tooth ends facing upwards. The second gear ring 31' includes a plurality of second teeth 311' arranged sequentially along the circumference of the output wheel 3. By splicing the second gear ring 31' with a plurality of second teeth 311', large and super-large reduction devices can be manufactured using general equipment without the need for special large gear-making equipment. This has significant practical and economic significance for the manufacture of large reduction equipment.

[0044] The second tooth 311' includes a second cylindrical portion 3111 and a second toothed portion 3112 connected sequentially from bottom to top. A second insertion hole 32' is provided on the upper surface of the output wheel 3 for inserting the second cylindrical portion 3111. The second toothed portion 3112 is located on the upper surface of the output wheel 3, and a tooth groove is formed between the second toothed portions 3112 of adjacent second teeth 311'. Using this structure, a second toothed ring 31' with good overall integrity can be assembled to fit the annular structure of the output component 3.

[0045] In this embodiment, a sliding sleeve 33' is provided in the second insertion hole 32', which is inserted close to the inner wall of the second insertion hole 32'. The second cylindrical portion 3111 is inserted into the sliding sleeve 33'. In the assembled state, there is a gap between the inner wall of the sliding sleeve 33' and the outer wall of the second cylindrical portion 3111. The gap allows for a small-angle tooth deflection between the second teeth 311', thereby improving the fit of the meshing surfaces, reducing friction, and meeting the requirements of high load.

[0046] The inner circumferential wall of the sliding sleeve 33' has multiple recesses 331' arranged circumferentially and extending radially, and a protruding ridge 332' is formed between two adjacent recesses 331' that can mate with the outer wall surface of the second cylindrical part 3111. This structure helps to improve the constraint accuracy of the sliding sleeve 33' on the second tooth 311'.

[0047] The second cylindrical portion 3111 has a notch 3110 extending upward from the bottom wall. The bottom of the second insertion hole 32' has an inverted U-shaped elastic element 34' made of metal wire. The upper part of the elastic element 34' is housed in the notch 3110, with the closed end of the U-shape abutting against the top of the notch 3111. The lower end of the elastic element 34' is constrained by the bottom wall of the second insertion hole 32'. The elastic element 34' ensures that the second tooth 311' maintains its axial position along the second cylindrical portion 3111. When the first reduction gear mechanism above the second tooth 3111 meshes with the second tooth 3111, it pushes the second tooth 3111 to deflect at a small angle, ensuring that the lower end of the first reduction gear mechanism is always in straight contact with the planar tooth profile of the second tooth 3111, thereby reducing interference and friction and improving transmission efficiency.

[0048] The aforementioned notch 3110 has an inverted V-shaped structure, and the closed end of the V-shaped structure is transitioned by an arc surface. The bottom wall of the second insertion hole 32' has a first limiting hole 321' and a second limiting hole 322' arranged radially along the output wheel 2 to cooperate with the open end of the U-shaped structure, so as to improve the limiting effect on the elastic member 34'.

[0049] To facilitate the restriction of the vertical position of the second tooth 3111, the upper surface of the output wheel 2 is also provided with a pressure plate 35' for constraining the second tooth 3111 on the output wheel 2. The pressure plate 35' consists of multiple pieces arranged at intervals along the circumference of the output wheel 2. The side of the second tooth-shaped portion 3112 is provided with an outwardly extending pressure edge 3113. The pressure plate 35' is locked onto the output wheel 32' by screws and has a clamping groove 351' on its inner side for holding the pressure edge 3113.

[0050] In this embodiment, the input planar impeller 2 is rotatably mounted on the top of the base 1. The upper surface of the input planar impeller 2 is the power output point and is connected to the drive component 9. The lower surface of the input planar impeller 2 is provided with a circumferentially arranged and undulating waveform structure 21, which includes three downward protrusions 211. The lower end of the output planar gear 3 is connected to the device body that needs to reduce speed. The movable gear assembly 4 is constrained in the base 1 and can move up and down. Its upper end rolls with the lower surface of the waveform structure 21, and its lower end rolls with the second gear ring 31' of the output planar gear 3. The number of movable gear assemblies 4 is greater than the number of the second teeth 3111 on the output planar gear 3. A compression spring 5 is provided in the base 1 to keep the upper end of the movable gear assembly 4 in contact with the waveform structure 21.

[0051] In this embodiment, the reduction ratio of the reducer is designed based on the number of waves on the input planar impeller 2. That is, the number of waves on the input planar impeller 2 corresponds to the difference between the number of movable gear components 4 and the number of teeth on the output planar gear 3. In this embodiment, the number of waveform structures 21 is N, the number of movable gear components 4 is Z1, and the number of teeth 31 on the output planar gear 3 is Z2. Therefore, N = (Z1 - Z2), and the reduction ratio is Z2:(Z1 - Z2).

[0052] The waveform structure 21 in this embodiment corresponds to an unfolded waveform line comprising three interconnected V-shaped segments, i.e., one protrusion 211 corresponds to one V-shaped segment, and the tip of the V-shaped segment is smoothly transitioned by an arc segment 212. With this structure, the angle between the straight segment of the V-shaped segment and the original creation plane is the wave angle, and the arc segment 212 between the two straight segments of the V-shaped segment serves as a transition portion. This structure helps improve the contact stability and reliability between the live tooth assembly 4 and the waveform structure 21, and further eliminates interference between the lower end of the live tooth assembly 4 and the second tooth 3111.

[0053] In this embodiment, a horizontally arranged assembly block 11 is provided in the middle of the base 1. The central part of the bottom of the input planar impeller 2 is rotatably connected to the top of the assembly block 11 through a first bearing assembly 100. The central part of the top of the output planar gear 3 is rotatably connected to the bottom of the assembly block 11 through a second bearing assembly 200. The assembly block 11 has a plurality of circumferentially spaced and vertically connected assembly holes 111 through which the movable gear assembly 4 passes. The outer edge of the input planar impeller 2 extends downward to form a wave structure 21. The edge of the upper surface of the output planar gear 3 is provided with a second gear ring 31'. The lower surface of the wave structure 21 corresponds to the assembly holes 111 and the second gear ring 31' from top to bottom.

[0054] The movable tooth assembly 4 in this embodiment includes a top seat 41, a movable tooth connecting post 42, a tooth seat 43, a roller 44, and a pin 45. The top seat 41 is disposed on the assembly block 11 and its top is in rolling engagement with the lower surface of the wave structure 21. The movable tooth connecting post 42 is arranged through the assembly hole 111 and can move up and down, with its upper end connected to the top seat 41. The upper end of the movable tooth connecting post 42 is fixedly connected to the bottom of the top seat 41 by an interference fit. The tooth seat 43 is connected to the lower end of the movable tooth connecting post 42, and the lower end of the movable tooth connecting post 42 is fixedly connected to the top of the tooth seat 43 by an interference fit. The roller 44 is rotatably disposed at the bottom of the tooth seat 43 and forms a tooth surface rolling engagement with two adjacent teeth 31. The pin 45 is used to constrain the roller 44 to the bottom of the tooth seat 43. This structure allows the movable tooth to roll and mesh with tooth 31 while maintaining a rigid structure, eliminating the existing tooth-to-tooth meshing interference problem, thereby improving load-bearing capacity and achieving a balanced output of torque and power in the reduction device. The upper surface of the assembly block 11 has a downwardly extending mounting groove 112 for accommodating the compression spring 5. The lower part of the compression spring 5 is accommodated in the mounting groove 112, and its upper end abuts against the top seat 41. This structure facilitates the installation of the compression spring 5 and ensures that the upper end of the movable tooth assembly 4 remains in contact with the lower surface of the wave structure 21.

[0055] Other detailed structures of the live tooth assembly 4 in this embodiment are the same as those in the earlier application CN202211555299.8, and will not be repeated here.

[0056] In this embodiment, the top of the base 1 is provided with an upper cover plate 01, which is used to surround the input wheel 2 and its assembly structure therein. The drive component 9 is arranged on the outside of the upper cover plate and the output shaft 91 passes through the upper cover plate.

[0057] It should be noted that, in order to more clearly and intuitively illustrate the assembly relationship between each gear and the corresponding input gear 2 and output gear 3, this embodiment... Figure 5 , Figure 6 The design conceals some individual teeth and corresponding holes, suggesting a gap between adjacent teeth. However, in reality, there is virtually no noticeable assembly gap between the individual teeth in this embodiment. Specifically, as shown below... Figure 3 As shown.

[0058] In this embodiment, a gear ring is formed by combining multiple teeth through splicing. The gear ring is respectively installed on the input wheel 2 and the output wheel 3, thereby receiving power from the upstream through the meshing structure. This embodiment makes the gear ring structure movable by splicing, eliminating the need for special large gear-making equipment. Large and super-large reduction devices can be manufactured using general equipment, which not only facilitates the processing and manufacturing of large gear rings, but also helps to improve the accuracy of the resulting tooth pitch and tooth profile. The drive mechanism uses multiple independent drive components to combine and drive, which greatly reduces the requirements of the power equipment and the manufacturing cost.

[0059] The specification and claims of this invention use terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," to describe various exemplary structural parts and elements of the invention. However, these terms are used herein merely for ease of explanation and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this invention can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A combined two-stage speed reduction device, comprising: Matrix (1); The input wheel (2) is rotatably mounted on the top of the base (1) and is used to connect with the drive mechanism; The output wheel (3) is rotatably disposed at the bottom of the base (1) for connecting to the device to be driven; The first reduction gear transmission structure is connected between the input wheel (2) and the output wheel (3); The feature is that it also includes: the drive mechanism is connected to the input wheel (2) through the second reduction transmission structure, the input wheel (2) and the output wheel (3) are provided with gear rings that receive power through the meshing structure respectively, and several individual teeth are assembled in a disassembled manner to form corresponding gear rings; The upper surface of the input wheel (2) is provided with a first tooth ring (21') with the tooth ends facing upwards. The first tooth ring (21') includes a plurality of first teeth (211') arranged sequentially along the circumference of the input wheel (2). The first tooth (211') includes a first cylindrical part (2111), a sector-shaped block part (2112), and a first tooth-shaped part (2113) connected sequentially from bottom to top. The upper surface of the input wheel (2) is provided with an annular groove (22') arranged circumferentially. The bottom wall of the annular groove (22') has a first insertion hole (221') for inserting the first cylindrical part (2111). The fan-shaped block part (2112) is accommodated in the annular groove (22') and is larger on the outside and smaller on the inside in the radial direction of the annular groove (22') so as to match the inner and outer walls of the annular groove (22'). The first toothed part (2113) is exposed above the annular groove (22'), and the first toothed parts (2113) of two adjacent first teeth (211') form a tooth groove. The drive mechanism includes at least two independent drive members (9), which are located on the side of the input wheel (2) and have an output shaft (91) extending radially above the first gear ring (21') along the input wheel (2). A gear (92) that can mesh with the first gear ring (21') is connected to the output shaft (91) of the drive member (9). The gear (92) and the first gear ring (21') together constitute the second reduction transmission structure.

2. The combined two-stage reduction gear according to claim 1, characterized in that: The annular groove (22') is filled with epoxy resin for filling gaps. After the epoxy resin is filled and before it is cured, the drive unit is operated so as to use its meshing with the first gear ring to modify the meshing surface.

3. The combined two-stage reduction gear according to claim 1 or 2, characterized in that: The upper surface of the output wheel (3) is provided with a second tooth ring (31') with the tooth ends facing upward. The second tooth ring (31') includes a plurality of second teeth (311') arranged sequentially along the circumference of the output wheel (3).

4. The combined two-stage reduction gear according to claim 3, characterized in that: The second tooth (311') includes a second cylindrical part (3111) and a second toothed part (3112) connected sequentially from bottom to top. The upper surface of the output wheel (3) is provided with a second insertion hole (32') for the second cylindrical part (3111) to be inserted therein. The second toothed part (3112) is located on the upper surface of the output wheel (3). The second toothed parts (3112) of two adjacent second teeth (311') form a tooth groove.

5. The combined two-stage reduction gear according to claim 4, characterized in that: The second insertion hole (32') is provided with a sliding sleeve (33') that is close to the inner wall of the second insertion hole (32') and inserted therein. The second cylindrical part (3111) is inserted in the sliding sleeve (33'). In the assembled state, there is a gap between the inner wall of the sliding sleeve (33') and the outer wall of the second cylindrical part (3111).

6. The combined two-stage reduction gear according to claim 5, characterized in that: The inner peripheral wall of the sliding sleeve (33') has a plurality of recesses (331') arranged circumferentially and extending radially, and a protruding ridge (332') is formed between two adjacent recesses (331') to cooperate with the outer wall surface of the second cylindrical part (3111).

7. The combined two-stage reduction gear according to claim 5, characterized in that: The second cylindrical portion (3111) has a notch (3110) extending upward from the bottom wall. The bottom of the second insertion hole (32') is provided with an elastic member (34') in the shape of an inverted U. The upper part of the elastic member (34') is accommodated in the notch (3110) and the closed end abuts against the top of the notch (3110). The lower end of the elastic member (34') is constrained to the bottom wall of the second insertion hole (32').

8. The combined two-stage reduction gear according to claim 7, characterized in that: The notch (3110) is an inverted V-shaped structure, and the closed end of the V-shaped structure is transitioned by a circular arc surface.

9. The combined two-stage reduction gear according to claim 7, characterized in that: The bottom wall of the second insertion hole (32') has a first limiting hole (321') and a second limiting hole (322') arranged radially along the output wheel (3) for engaging with the open end of the U-shaped structure.

10. The combined two-stage reduction gear according to claim 4, characterized in that: The upper surface of the output wheel (3) is also provided with a pressure plate (35') for constraining the second tooth (311') on the output wheel (3). The pressure plate (35') consists of multiple pieces arranged at intervals along the circumference of the output wheel (3). The side of the second tooth-shaped portion (3112) is provided with an outwardly extending pressure edge (3113). The pressure plate (35') is locked onto the output wheel (3) by screws and has a clamping groove (351') on its inner side for holding the pressure edge (3113).

11. The combined two-stage reduction gear according to claim 3, characterized in that: The input wheel (2) is an input planar impeller, and the lower surface of the input planar impeller is provided with a waveform structure (21) arranged circumferentially and with varying heights. The waveform structure (21) includes at least two downward protrusions (211). The output wheel (3) is an output planar gear (92).

12. The combined two-stage reduction gear according to claim 11, characterized in that: The first deceleration transmission structure includes a movable gear assembly (4) and a compression spring (5). The movable gear assembly (4) is constrained in the base (1) and can move up and down. Its upper end rolls with the lower surface of the wave structure (21), and its lower end rolls with the second gear ring (31') of the output plane gear (92). The number of movable gear assemblies (4) is greater than the number of the second teeth (311') on the output plane gear (92). The compression spring (5) is located in the base (1) so that the movable gear assembly (4) always maintains the tendency of its upper end to contact the wave structure (21).

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