Speed reducer

Abstract

The speed reducer comprises a connecting shaft, a gear, a limiting structure and an abutting piece, the first end of the connecting shaft is used for being connected with a driving piece, the second end of the connecting shaft is provided with an installation groove, the peripheral wall of the connecting shaft is provided with a via hole communicated with the installation groove, the gear is arranged on the connecting shaft in a sleeved mode, and the gear is arranged on the gear. The inner circumferential wall of the gear is provided with a clamping groove communicating with the via hole, the limiting structure can elastically deform, the head of the limiting structure abuts against the interior of the mounting groove, and the tail of the limiting structure is arranged in the mounting groove or the tail of the limiting structure penetrates through the via hole to extend into the clamping groove after the limiting structure deforms. At least one part of the abutting part is movably arranged in the mounting groove, the abutting part abuts against the limiting structure, and the abutting part provides driving force for elastic deformation of the limiting structure. The speed reducer solves the problems that in a speed reducer in the prior art, the universality of the structure of an input shaft and an input gear is poor, and when the speed reducer is matched with different devices, overall disassembly is needed, and operation is complex.

Description

Technical Field

[0001] The utility model relates to the technical field of speed reducers, and more specifically, to a speed reducer. Background Art

[0002] As a type of speed reducer, the RV speed reducer is mainly a new type of cycloidal pinwheel planetary transmission composed of a first-stage gear transmission and a second-stage cycloidal drive. It has the advantages of high transmission accuracy, small backlash, large stiffness, strong shock resistance, compact structure, and high transmission efficiency. Therefore, the RV speed reducer is widely used in industrial robots, machine tools and other equipment.

[0003] At present, on the market, one device is mostly used for one reduction ratio. However, according to the different actual uses of products, the requirements for the reduction ratio are different. When the corresponding RV speed reducer is adapted to different devices, the corresponding transmission gears need to be replaced. At present, the input shaft and input gear of the RV speed reducer mostly adopt an integrated design structure, resulting in the need to replace the overall structure when adapting to different devices, and the operation is complex; moreover, the number of teeth of the gear with the integrated structure and the length of the input shaft are fixed. When adapting to different devices, an integrated structure of a gear with specific number of teeth and an input shaft with a specific length is required. Therefore, there is a problem of poor versatility.

[0004] As can be seen from the above, the speed reducer in the prior art has the problems that the structures of the input shaft and the input gear have poor versatility and the overall disassembly is required when adapting to different devices, and the operation is complex. Summary of the Utility Model

[0005] The main purpose of the utility model is to provide a speed reducer to solve the problems that the structures of the input shaft and the input gear of the speed reducer in the prior art have poor versatility and the overall disassembly is required when adapting to different devices, and the operation is complex.

[0006] To achieve the above object, according to one aspect of the utility model, a speed reducer is provided. The speed reducer includes a connecting shaft, the first end of the connecting shaft is used to connect with a driving member, the second end of the connecting shaft has an installation groove, and a through hole communicating with the installation groove is provided on the outer peripheral wall of the connecting shaft; a gear, the gear is sleeved on the connecting shaft, and a clamping groove communicating with the through hole is provided on the inner peripheral wall of the gear; a limiting structure capable of elastic deformation, the head of the limiting structure abuts against the inside of the installation groove, the tail of the limiting structure is arranged inside the installation groove, or after the limiting structure is deformed, the tail of the limiting structure penetrates through the through hole and extends into the inside of the clamping groove; an abutting member, at least a part of the abutting member is movably arranged inside the installation groove, the abutting member abuts against the limiting structure, and the abutting member provides a driving force for the elastic deformation of the limiting structure.

[0007] Furthermore, the limiting structure includes a plurality of claws, one ends of the plurality of claws are connected to form a head portion, and the other ends of the plurality of claws are spaced apart along the circumference of the connecting shaft to form a tail portion, and the plurality of claws form a conical space.

[0008] Furthermore, the limiting structure has a first position and a second position where elastic deformation occurs. When the limiting structure is in the first position, the abutment member provides a driving force for the limiting structure to be in the second position. The tails of the multiple claws are arranged inside the mounting groove. When the limiting structure is in the second position, the multiple claws expand toward one side of the head and the tails extend through the through hole into the interior of the groove.

[0009] Further, a plurality of claws are arranged at equal intervals along the circumference of the connecting shaft; and / or three claws are arranged.

[0010] Furthermore, a positioning groove with an opening facing the notch of the installation groove is provided on the bottom surface of the installation groove, and the head of the limiting structure is arranged inside the positioning groove.

[0011] Furthermore, the positioning groove is a tapered groove; and / or the positioning groove is coaxial with the mounting groove.

[0012] Furthermore, the abutment member moves axially along the connecting shaft, and one end of the abutment member facing the limiting structure has a conical abutment head, the cone angle of the abutment head is larger than the cone angle of the conical space, and the abutment head is used to abut against multiple claws and drive the multiple claws to expand.

[0013] Furthermore, the abutment member moves along the axial direction of the connecting shaft, the inner peripheral wall of the mounting groove is provided with an internal thread, the outer peripheral wall of the abutment member is provided with an external thread, and the abutment member is rotationally connected to the mounting groove thread.

[0014] Furthermore, the abutment member has an operating portion on a side facing away from the limiting structure, and the operating portion is used to cooperate with a tool.

[0015] Furthermore, the operating portion is a hexagonal groove.

[0016] Furthermore, the outer peripheral wall of the connecting shaft has an axially arranged first arm segment and a second arm segment, the diameter of the first arm segment is larger than the diameter of the second arm segment, a radially extending abutment surface is formed at the connection between the first arm segment and the second arm segment, and the gear sleeve is arranged on the second arm segment and fits the abutment surface.

[0017] Furthermore, the first end of the connecting shaft is provided with an axially extending groove structure, and the groove structure is used for the output shaft of the driving member to extend into.

[0018] Applying the technical solution of the present utility model, the speed reducer of the present application includes a connecting shaft, a gear, a limiting structure and an abutting member. The first end of the connecting shaft is used to connect with a driving member. The second end of the connecting shaft has an installation groove. There is a through hole on the outer peripheral wall of the connecting shaft that communicates with the installation groove. The gear is sleeved on the connecting shaft. There is a clamping groove on the inner peripheral wall of the gear that communicates with the through hole. The limiting structure can undergo elastic deformation. The head of the limiting structure abuts against the inside of the installation groove. The tail of the limiting structure is arranged inside the installation groove, or after the limiting structure deforms, the tail of the limiting structure penetrates through the through hole and extends into the inside of the clamping groove. At least a part of the abutting member is movably arranged inside the installation groove. The abutting member abuts against the limiting structure, and the abutting member provides a driving force for the elastic deformation of the limiting structure.

[0019] As can be seen from the above, the speed reducer of the present application adopts a split setting of the connecting shaft and the gear. The limiting structure that can undergo elastic deformation is deformed under the push of the abutting member to realize the locking connection between the connecting shaft and the gear. Among them, the limiting structure can be abutted by moving the abutting member or the abutting of the limiting structure can be released by moving the abutting member. Under the abutting action of the abutting member, the tail of the limiting structure can deform and extend into the inside of the clamping groove to lock the gear; when the corresponding abutting member releases the abutting of the limiting structure, the limiting structure returns to its original state and is located inside the installation groove. At this time, the connecting shaft and the gear can be disassembled relatively. The structural setting of the speed reducer of the present application can realize the independent replacement of the gear and the connecting shaft, and then match the equipment with different reduction ratio requirements, improving the overall applicability. At the same time, the operation is simple, which is conducive to improving the maintenance and replacement efficiency. Description of the Drawings

[0020] The schematic drawings forming a part of this application are used to provide a further understanding of the present utility model. The illustrative embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation of the present utility model. In the drawings:

[0021] Figure 1 Shows a structural cross-sectional view of the cooperation of the connecting shaft, gear, limiting structure and abutting member of the present utility model;

[0022] Figure 2 Shows a structural cross-sectional view of the cooperation of the connecting shaft, limiting structure and abutting member of the present utility model;

[0023] Figure 3 Shows a cross-sectional view of the connecting shaft of the present utility model;

[0024] Figure 4 Shows a cross-sectional view of the abutting member of the present utility model;

[0025] Figure 5 Shows a cross-sectional view of the gear of the present utility model.

[0026] Figure 6The side view of the limiting structure of the present utility model is shown;

[0027] Figure 7 The schematic three-dimensional structure diagram of the limiting structure of the present utility model is shown;

[0028] Figure 8 The cross-sectional view of the speed reducer of the present utility model is shown.

[0029] Among them, the above-mentioned drawings include the following reference numerals:

[0030] 10. Connecting shaft; 110. Groove structure; 120. Installation groove; 121. Positioning groove; 130. Through hole; 140. First arm section; 150. Second arm section; 20. Gear; 210. Card slot; 30. Limiting structure; 310. Claw; 320. Head; 330. Tail; 40. Abutting member; 410. Abutting head; 420. Operating part. Detailed implementation manners

[0031] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0032] It should be pointed out that, unless otherwise specified, all technical and scientific terms used in the present application have the same meanings as those commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0033] In the present utility model, unless otherwise stated, the orientation words such as "upper, lower, top, bottom" are usually in the directions shown in the drawings, or in the vertical, perpendicular or gravitational directions of the components themselves; similarly, for the convenience of understanding and description, "inner, outer" refer to the inner and outer of the contours of the respective components themselves, but the above orientation words do not limit the present utility model.

[0034] In order to solve the problems that the structures of the input shaft and the input gear in the existing speed reducers have poor universality and the overall disassembly operation is complicated when adapting to different devices, the present utility model provides a speed reducer, wherein the speed reducer is an RV speed reducer.

[0035] The speed reducer of this embodiment is mainly applied to devices involving transmission structures such as industrial robots and machine tools.

[0036] Such as Figures 1 to 8As shown in the figure, the speed reducer includes a connecting shaft 10, a gear 20, a limiting structure 30, and an abutting member 40. The first end of the connecting shaft 10 is used to connect with a driving member. The second end of the connecting shaft 10 has an installation groove 120. A through hole 130 communicating with the installation groove 120 is provided on the outer peripheral wall of the connecting shaft 10. The gear 20 is sleeved on the connecting shaft 10. A clamping groove 210 communicating with the through hole 130 is provided on the inner peripheral wall of the gear 20. The limiting structure 30 can undergo elastic deformation. The head 320 of the limiting structure 30 abuts against the inside of the installation groove 120. The tail 330 of the limiting structure 30 is arranged inside the installation groove 120, or after the limiting structure 30 is deformed, the tail 330 of the limiting structure 30 penetrates through the through hole 130 and extends into the inside of the clamping groove 210. At least a part of the abutting member 40 is movably arranged inside the installation groove 120. The abutting member 40 abuts against the limiting structure 30, and the abutting member 40 provides a driving force for the elastic deformation of the limiting structure 30.

[0037] Specifically, the speed reducer of the present application adopts a split setting of the connecting shaft 10 and the gear 20, and realizes the locking connection between the connecting shaft 10 and the gear 20 after the limiting structure 30 that can undergo elastic deformation is deformed under the push of the abutting member 40.

[0038] Among them, the gear 20 has an external gear ring. The gear 20 is sleeved on the connecting shaft 10, and the gear 20 and the connecting shaft 10 are slidably arranged between them to facilitate disassembly and installation.

[0039] It should be noted that the elastic deformation of the limiting structure 30 in the present application means that the limiting structure 30 will deform under the drive of an external force, for example, under the abutting action of the abutting member 40 of the present application, and can return to its original state when the external force disappears, that is, when the abutting is released.

[0040] Furthermore, the gear 20 is a planetary gear 20.

[0041] In this embodiment, the installation groove 120 is arranged with the notch facing away from the driving member, and the installation groove 120 extends along the axial direction of the connecting shaft 10.

[0042] It can be understood that the driving member is a structure for driving the speed reducer, such as an electric motor. The first end of the connecting shaft 10 is used for driving connection with the output shaft of the driving member to realize the connection between the speed reducer and the driving member.

[0043] In this embodiment, the abutting and limiting structure 30 can be abutted and limited by moving the abutting member 40, or the abutting and limiting structure 30 can be released by moving the abutting member 40. Under the abutting action of the abutting member 40, the tail 330 of the limiting structure 30 can be deformed and extended into the inside of the clamping groove 210 to lock the gear 20. When the corresponding abutting member 40 releases the abutting and limiting structure 30, when the limiting structure 30 returns to its original state, it is located inside the installation groove 120. At this time, the connecting shaft 10 and the gear 20 can be disassembled relatively. The structural setting of the reducer of the present application can realize the independent replacement of the gear 20 and the connecting shaft 10, and then match the equipment with different reduction ratio requirements, improving the overall applicability. At the same time, the operation is simple, which is beneficial to improving the maintenance and replacement efficiency.

[0044] As Figure 1 , Figure 2 , Figure 6 and Figure 7 shown, the limiting structure 30 includes a plurality of claws 310. One ends of the plurality of claws 310 are connected to form a head 320, and the other ends of the plurality of claws 310 are arranged at intervals along the circumferential direction of the connecting shaft 10 to form a tail 330. The plurality of claws 310 form a conical space.

[0045] Among them, one ends of the plurality of claws 310 are fixedly connected to form a head 320 with a taper angle. The other ends of the plurality of claws 310 extend toward the side away from the driving member. The plurality of claws 310 cooperate to form a conical space to facilitate the abutting member 40 to extend into the inside of the abutting space to abut the claws 310.

[0046] The structural setting that the plurality of claws 310 cooperate to form a conical space is beneficial to facilitating the elastic deformation of the limiting structure 30 to expand and realizing the retraction after the deformation is released. The expandable structural setting can enable the tail 330 of the claws 310 to penetrate through the through hole 130 and extend into the inside of the clamping groove 210.

[0047] In this embodiment, the clamping groove 210, the through hole 130 and the claws 310 are arranged in one-to-one correspondence.

[0048] Specifically, the limiting structure 30 has a first position and a second position where elastic deformation occurs. When the limiting structure 30 is in the first position, the abutting member 40 provides a driving force for the limiting structure 30 to be in the second position. The tails 330 of the plurality of claws 310 are arranged inside the installation groove 120. When the limiting structure 30 is in the second position, the plurality of claws 310 expand toward the head 320 side and the tails 330 penetrate through the through hole 130 and extend into the inside of the clamping groove 210.

[0049] The limiting structure 30 remains in the first position when not under force. When the limiting structure 30 is subjected to the abutting driving force of the abutting member 40, it deforms towards the second position. During the deformation process, the head 320 of the limiting structure 30 remains in contact with the installation groove 120, and the abutting member 40 drives the expansion of the claw 310. The plurality of claws 310 in the second position form a conical space with a larger cone angle than that of the plurality of claws 310 in the first position.

[0050] In this embodiment, the plurality of claws 310 are deformed synchronously under force. To ensure the stability of synchronous deformation, the plurality of claws 310 are arranged at equal intervals in the circumferential direction of the connecting shaft 10. By adopting the structure of arranging at equal intervals in the circumferential direction of the connecting shaft 10, the plurality of claws 310 are uniformly stressed, thereby ensuring the synchronous deformation of the plurality of claws 310.

[0051] In this embodiment, three claws 310 are provided, that is, the limiting structure 30 is a three-claw structure, and the tails 330 of the three claws 310 are arranged at intervals of 120° in the circumferential direction of the connecting shaft 10.

[0052] As Figures 1 to 3 shown, the bottom surface of the installation groove 120 has a positioning groove 121 with an opening facing the notch, and the head 320 of the limiting structure 30 is arranged inside the positioning groove 121.

[0053] Specifically, for the convenience of installing the limiting structure 30 and ensuring the stable contact of the head 320 of the limiting structure 30 with the limiting groove, the present application adopts the setting of the positioning groove 121 to realize that the head 320 is arranged inside the positioning groove 121. Then, during the installation process of the limiting structure 30, the head 320 of the limiting structure 30 can be inserted into the positioning groove 121 to complete the installation, improving the installation efficiency and accuracy of the limiting structure 30; at the same time, when the limiting structure 30 is driven by the abutting member 40, the head 320 of the limiting structure 30 is restricted by the positioning groove 121 and will not move. Then, under the drive of the abutting member 40, the tail 330 of the limiting structure 30 moves along with the expansion of the claw 310.

[0054] Furthermore, the positioning groove 121 is a conical groove to adapt to the conical head 320 of the limiting structure 30.

[0055] In this embodiment, the positioning groove 121 and the installation groove 120 are coaxially arranged to enable the limiting structure 30 installed inside the installation groove 120 to synchronously penetrate the through hole 130 of the connecting shaft 10 with the tail 330 and extend into the inside of the card slot 210.

[0056] As Figure 1 、 Figure 2 and Figure 4As shown, the abutting member 40 moves axially along the connecting shaft 10. One end of the abutting member 40 facing the limiting structure 30 has a conical abutting head 410. The cone angle of the abutting head 410 is larger than the cone angle of the conical space. The abutting head 410 is used to abut against a plurality of claws 310 and drive the plurality of claws 310 to expand.

[0057] Among them, the abutting member 40 adopts an abutting head 410 with a cone angle larger than the conical space of the limiting structure 30, so that under the driving action of the abutting head 410, the limiting structure 30 can expand, and further realize driving the limiting structure 30 to switch from the first position to the second position, and the tail 330 of the limiting member can penetrate through the through hole 130 and extend into the inside of the card slot 210.

[0058] In this embodiment, the inner peripheral wall of the installation groove 120 on the abutting member 40 has internal threads, and the outer peripheral wall of the abutting member 40 has external threads. The abutting member 40 is rotationally connected to the installation groove 120 by threads. When it is necessary to move the abutting member 40, the abutting member 40 can be rotated. Under the structure of the internal and external thread mating, the abutting member 40 can move along the axial direction of the connecting member.

[0059] As Figure 4 shown, one side of the abutting member 40 facing away from the limiting structure 30 has an operating portion 420, and the operating portion 420 is used to cooperate with a tool.

[0060] Among them, the operating portion 420 is used for the tool to operate, so as to realize driving the movement of the abutting member 40 through the tool.

[0061] Specifically, the operating portion 420 is an internal hexagonal groove, and the tool is a corresponding hexagonal wrench. Under the drive of the hexagonal wrench, the abutting member 40 can be driven to rotate, thereby realizing the movement of the abutting member 40.

[0062] The hexagonal groove refers to a groove whose inner wall surface is a groove surrounded by six planes that are sequentially connected end to end. The hexagonal wrench is a common wrench structure on the market.

[0063] As Figure 3 shown, the outer peripheral wall of the connecting shaft 10 has an axially arranged first arm segment 140 and a second arm segment 150. The diameter of the first arm segment 140 is larger than the diameter of the second arm segment 150. A radially extending abutting surface is formed at the connection of the first arm segment 140 and the second arm segment 150. The gear 20 is sleeved on the second arm segment 150 and fits with the abutting surface.

[0064] Among them, an abutting surface is formed on the outer peripheral wall of the connecting shaft 10 to limit the gear 20 through the setting of the abutting surface, which is convenient for the gear 20 to be arranged on the connecting shaft 10 and prevent the phenomenon of axial offset.

[0065] Furthermore, the diameter of the first arm segment 140 is greater than that of the second arm segment 150, and the first arm segment 140 is used to cooperate with the driving member. Thus, the first arm segment 140 with a larger diameter has better strength, which is beneficial to improving the stability of the connection between the connecting shaft 10 and the driving member.

[0066] In this embodiment, an axially extending groove structure 110 is provided at the first end of the connecting shaft 10 for the output shaft of the driving member to extend into. The groove structure 110 is provided to facilitate the cooperation with the output shaft of the driving member through the groove structure 110. It can be that the end of the output shaft of the driving member extends into the inside of the groove structure 110 to drive the connecting shaft 10 to rotate.

[0067] From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects:

[0068] The reducer of the present application adopts a split setting of the connecting shaft 10 and the gear 20. The elastic deformation-limiting structure 30 is locked to connect the connecting shaft 10 and the gear 20 after being deformed under the push of the abutting member 40. Among them, the abutting member 40 can be moved to abut against the limiting structure 30 or the abutting member 40 can be moved to release the abutting against the limiting structure 30. Under the abutting action of the abutting member 40, the tail 330 of the limiting structure 30 can be deformed and extend into the inside of the card slot 210 to lock the gear 20. When the corresponding abutting member 40 releases the abutting against the limiting structure 30, the limiting structure 30 returns to its original state and is located inside the installation groove 120. At this time, the connecting shaft 10 and the gear 20 can be disassembled relative to each other. The structural setting of the reducer of the present application can realize the independent replacement of the gear 20 and the connecting shaft 10, and then match equipment with different reduction ratio requirements, improving the overall applicability. At the same time, the operation is simple, which is beneficial to improving the maintenance and replacement efficiency.

[0069] Obviously, the above-described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0070] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0071] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of this application described here can be implemented in an order other than those illustrated or described here.

[0072] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, various changes and modifications can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A reducer, characterized in that: include: A connecting shaft (10), wherein a first end of the connecting shaft (10) is used to be connected to a driving member, a second end of the connecting shaft (10) has a mounting groove (120), and an outer peripheral wall of the connecting shaft (10) has a through hole (130) in communication with the mounting groove (120); A gear (20), the gear (20) being sleeved on the connecting shaft (10), and having an inner peripheral wall of the gear (20) having a slot (210) communicating with the through hole (130); A limiting structure (30) capable of elastic deformation, wherein a head portion (320) of the limiting structure (30) abuts against the interior of the mounting groove (120), a tail portion (330) of the limiting structure (30) is arranged inside the mounting groove (120), or after the limiting structure (30) is deformed, the tail portion (330) of the limiting structure (30) passes through the through hole (130) and extends into the interior of the card slot (210); An abutment member (40), at least a portion of which is movably disposed inside the mounting groove (120), the abutment member (40) abuts against the limiting structure (30), and the abutment member (40) provides a driving force for the limiting structure (30) to undergo elastic deformation.

2. The reducer according to claim 1, characterized in that: The limiting structure (30) comprises a plurality of claws (310), one ends of the plurality of claws (310) are connected to form the head portion (320), the other ends of the plurality of claws (310) are arranged at intervals along the circumference of the connecting shaft (10) to form the tail portion (330), and the plurality of claws (310) form a conical space.

3. The reducer according to claim 2, characterized in that: The limiting structure (30) has a first position and a second position where elastic deformation occurs. The abutment member (40) provides a driving force for the limiting structure (30) to be in the second position. When the limiting structure (30) is in the first position, the tails (330) of the plurality of claws (310) are arranged inside the mounting groove (120). When the limiting structure (30) is in the second position, the plurality of claws (310) expand toward one side of the head (320) and the tails (330) penetrate the through hole (130) and extend into the inside of the groove (210).

4. The reducer according to claim 2, characterized in that: The plurality of claws (310) are arranged at equal intervals along the circumference of the connecting shaft (10); and / or The number of the clamping claws (310) is three.

5. The reducer according to claim 1, characterized in that: The bottom surface of the installation groove (120) is provided with a positioning groove (121) which is opened toward the notch of the installation groove (120), and the head (320) of the limiting structure (30) is arranged inside the positioning groove (121).

6. The reducer according to claim 5, characterized in that: The positioning groove (121) is a conical groove; and / or The positioning groove (121) and the installation groove (120) are coaxial.

7. The reducer according to claim 2, characterized in that: The abutment member (40) moves axially along the connecting shaft (10), and one end of the abutment member (40) facing the limiting structure (30) has a conical abutment head (410), the conical angle of the abutment head (410) is larger than the conical angle of the conical space, and the abutment head (410) is used to abut against the plurality of claws (310) and drive the plurality of claws (310) to expand.

8. The reducer according to claim 1, characterized in that: The abutment member (40) moves axially along the connecting shaft (10); the inner peripheral wall of the mounting groove (120) has an internal thread; the outer peripheral wall of the abutment member (40) has an external thread; the abutment member (40) is threadedly rotatably connected to the mounting groove (120).

9. The reducer according to claim 1, characterized in that: The side of the abutment member (40) facing away from the limiting structure (30) has an operating portion (420), and the operating portion (420) is used to cooperate with a tool.

10. The reducer according to claim 9, characterized in that: The operating portion (420) is a hexagonal groove.

11. The reducer according to any one of claims 1 to 10, characterized in that: The outer peripheral wall of the connecting shaft (10) comprises a first arm segment (140) and a second arm segment (150) which are axially arranged, the diameter of the first arm segment (140) being larger than the diameter of the second arm segment (150), a radially extending abutment surface being formed at the connection between the first arm segment (140) and the second arm segment (150), and the gear (20) being sleeved on the second arm segment (150) and in contact with the abutment surface.

12. The reducer according to any one of claims 1 to 10, characterized in that: The first end of the connecting shaft (10) is provided with an axially extending groove structure (110), and the groove structure (110) is used for the output shaft of the driving member to extend into.

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