Coupling and connecting system

Abstract

The embodiment of the utility model discloses a coupling and a connecting system. The coupling comprises a coupling body and two shaft sleeves. The coupling main body comprises at least two connecting pieces, each connecting piece is encircled to form two coaxially arranged mounting holes, one end, deviating from the other mounting hole, of one of the two mounting holes is communicated with the outside, and the two adjacent connecting pieces are connected with each other; the two shaft sleeves are arranged in the two mounting holes respectively, any shaft sleeve comprises at least two sub-shells, first matching parts are arranged on the inner sides of the sub-shells in the radial direction of the mounting holes, the first matching parts are used for limiting the connecting shaft in the axial direction and the circumferential direction, and the first matching parts are connecting keys or connecting key grooves. According to the coupler, the transmission reliability of a connecting system can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of transmission accessories, and in particular to a coupling and a connection system. Background Art

[0002] A coupling is a component that connects the motor shaft and the drive shaft. In related art, a coupling consists of a coupling body and a sleeve. During installation, a single screw passes through the coupling body and sleeve, securing the coupling to the drive shaft or motor shaft, forming a connection system. This type of coupling is prone to torque transmission failure during high rotation speeds or under heavy loads, resulting in relatively poor transmission reliability. Utility Model Content

[0003] In view of this, the embodiments of the present application hope to provide a coupling and a connection system, aiming to improve the transmission reliability of the connection system.

[0004] To solve the above problems, the technical solution of the embodiment of the present application is implemented as follows:

[0005] A first aspect of an embodiment of the present application provides a coupling, comprising:

[0006] The coupling body includes at least two connecting members, each of the connecting members is surrounded by two coaxially arranged mounting holes, one end of the two mounting holes facing away from the other is in communication with the outside, and two adjacent connecting members are connected to each other;

[0007] Two shaft sleeves are respectively arranged in the two mounting holes. Any shaft sleeve includes at least two sub-shells. The sub-shells are provided with a first matching portion along the radial inner side of the mounting hole. The first matching portion is used to limit the connecting shaft in the axial and circumferential directions. The first matching portion is a connecting key or a connecting keyway.

[0008] In some embodiments, the first matching portion is a connecting key, the connecting key extends along the axial direction of the sub-shell, and two ends of the connecting key extend to two ends of the sub-shell respectively.

[0009] In some embodiments, the connecting member is provided with two mounting grooves spaced apart along its axial direction, the groove walls of the mounting grooves constitute the hole walls of the mounting hole, a sub-shell is respectively provided in the two mounting grooves, and the sub-shell is interference fit with the groove walls of the mounting groove.

[0010] In some embodiments, the connecting member includes a main body and a partition, the main body is provided with a groove extending along the axial direction of the coupling, and the two ends of the groove extend to the two ends of the main body respectively, and the partition wall is provided in the groove and divides the groove into the two mounting grooves; and / or,

[0011] Along the circumference of the coupling, one of the two adjacent connecting members is provided with a clamping hole, and the other is provided with a buckle, and the buckle is clamped in the clamping hole.

[0012] In some embodiments, along the circumference of the mounting hole, two adjacent sub-shells are limitedly matched.

[0013] In some embodiments, the sub-shell is provided with a positioning portion, and along the circumference of the mounting hole, the positioning portion of one of the two adjacent sub-shells is a positioning pin, and the positioning portion of the other sub-shell is a positioning hole, and at least a portion of the positioning pin is provided in the positioning hole.

[0014] In some embodiments, the sub-shell is provided with a plurality of positioning portions spaced apart along its axial direction.

[0015] In some embodiments, the connecting member is made of a flexible material.

[0016] A second aspect of an embodiment of the present application provides a connection system, the connection system comprising:

[0017] Two connecting shafts;

[0018] In the coupling described in any one of the above embodiments, the two sleeves are respectively sleeved on the two connecting shafts;

[0019] Wherein, the connecting shaft is provided with a second matching portion, one of the first matching portion and the second matching portion is a connecting key, and the other is a connecting key slot, and at least a portion of the connecting key is provided in the connecting key slot.

[0020] In some embodiments, the groove wall of the connecting key groove extends continuously along its circumference and is connected end to end.

[0021] In the coupling of the embodiment of the present application, the coupling sleeve and the connecting shaft utilize a mating structure of a connecting key and a connecting keyway to limit the connecting shaft in both the axial and circumferential directions. The torque between the connecting shaft and the coupling is transmitted via the connecting key and the connecting keyway, rather than relying on friction, thereby improving the reliability of torque transmission. Furthermore, the coupling body and the sleeve are both split-piece structures, allowing both to be installed radially close to the connecting shaft or removed away from it, making assembly and disassembly of the coupling more convenient.

[0022] Furthermore, with the connecting shafts axially restrained, neither shaft is likely to displace axially, potentially colliding with the other. This eliminates the need for a rubber stopper between the two shafts, thus improving assembly efficiency between the coupling and the connecting shaft. Furthermore, since no rubber stopper is required, the risk of missing a rubber stopper is eliminated, creating a fool-proof design. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 An exploded view of a coupling according to an embodiment of the present application;

[0024] Figure 2 An exploded diagram of a connection system according to an embodiment of the present application;

[0025] Figure 3 This is a schematic structural diagram of a coupling according to an embodiment of the present application;

[0026] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure along AA;

[0027] Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure along BB.

[0028] Description of Reference Numerals

[0029] 100, coupling; 10, coupling body; 10a, mounting hole; 11, connector; 11a, mounting groove; 11b, snap-fit ​​hole; 11c, buckle; 111, main body; 112, spacer; 20, sleeve; 21, subshell; 21a, first mating portion; 21b, positioning portion; 21b1, positioning pin; 21b2, positioning hole; 200, connecting shaft; 200a, second mating portion. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. The following embodiments are only used to more clearly illustrate the technical solutions of the present application and are therefore only used as examples and are not intended to limit the scope of protection of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0031] In the description of the embodiments of this application, the technical terms "first," "second," "third," etc. are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0032] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0033] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0034] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0035] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

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

[0037] The fan assembly of an air conditioner usually has multiple connecting shafts, which are connected by couplings to achieve the transmission of motion and torque.

[0038] In the related art, the coupling includes a coupling body and a sleeve, and a plane is set on the outer peripheral surface of the connecting shaft. When installing the coupling, a screw is passed through the coupling body and the sleeve in sequence and abuts against the plane of the connecting shaft. The torque is transmitted by the friction between the screw and the plane. The two connecting shafts also need to be separated by a rubber plug to prevent the two connecting shafts from accidentally colliding and producing abnormal noise.

[0039] However, a coupling with this structure, firstly, transmits torque through the friction between the screw and the plane of the connecting shaft, and there is a risk of slipping when rotating at high speed or under heavy load; secondly, the screw needs to abut the plane of the connecting shaft, and manual visual positioning is required when screwing the screw, and there is a risk of hitting the arc surface of the connecting shaft. If the screw hits the arc surface, the friction between the screw and the arc surface is small, which cannot meet the torque transmission requirements. At the same time, the arc surface is concave at the point where the screw abuts, and the outer periphery of the depression will bulge to form burrs, which may make it impossible to remove the coupling; thirdly, after the coupling is installed, the rubber plug cannot be seen and is easy to be missed, which may cause abnormal noise problems.

[0040] In summary, the couplings in the related art have relatively poor reliability.

[0041] Based on this, the first aspect of the embodiment of the present application provides a coupling. Figure 1 , Figure 1 FIG2 is an exploded view of a coupling 100 according to an embodiment of the present invention. The coupling 100 includes a coupling body 10 and a sleeve 20.

[0042] See also Figure 2 , Figure 2 FIG2 is an exploded view of a connection system according to an embodiment of the present application. The connection system includes two connection shafts 200 and a coupling 100 according to any embodiment of the present application.

[0043] The application field of the connection system is not limited. For example, the connection system can be applied to the field of air conditioning.

[0044] One of the two connecting shafts 200 may be a motor shaft, and the other may be a transmission shaft.

[0045] It should be noted that the connecting shaft 200 can be a solid shaft or a hollow shaft. Figure 4 In a specific embodiment, one of the two connecting shafts 200 is a solid shaft, and the other is a hollow shaft.

[0046] The two shaft sleeves 20 are respectively sleeved on the two connecting shafts 200, and the shaft sleeves 20 can rotate synchronously with the coupling body 10. In this way, the rotation of one connecting shaft 200 can drive the other connecting shaft 200 to rotate synchronously.

[0047] The coupling body 10 includes at least two connecting members 11. Each connecting member 11 is surrounded by two coaxially arranged mounting holes 10a. One end of the two mounting holes 10a facing away from the other is in communication with the outside. Two adjacent connecting members 11 are connected to each other.

[0048] For example, see Figure 1 and Figure 2, there are two connectors 11. Of course, in other embodiments, the number of connectors 11 can be any number greater than two. It is understood that the fewer the number of connectors 11, the fewer the number of parts required for assembly, and the higher the assembly efficiency. For ease of explanation, the present embodiment uses two connectors 11 as an example.

[0049] The specific structure of the mounting holes 10a is not limited. In some embodiments, the mounting holes 10a can be through holes, that is, the two mounting holes 10a are connected at one end close to each other. In other embodiments, the mounting holes 10a can be blind holes, that is, the two mounting holes 10a are not connected at one end close to each other.

[0050] The two sleeves 20 are respectively disposed in the two mounting holes 10a. It should be noted that, taking one of the sleeves 20 as an example, the sleeve 20 can be completely located in the corresponding mounting hole 10a; or the sleeve 20 can be partially located in the corresponding mounting hole 10a and the other part exposed outside the corresponding mounting hole 10a.

[0051] Each sleeve 20 includes at least two sub-shells 21. For example, see Figure 1 , a shaft sleeve 20 includes two sub-shells 21. The two sub-shells 21 can be half shells, so that the sizes of the two sub-shells 21 are closer, which is convenient for production using the same processing method or tool, thereby helping to reduce the production cost of the sub-shells 21.

[0052] The sub-shell 21 is provided with a first matching portion 21 a on the radial inner side of the mounting hole 10 a . The first matching portion 21 a is used to limit the connecting shaft 200 in the axial and circumferential directions.

[0053] The connecting shaft 200 has a second mating portion 200a. One of the first mating portion 21a and the second mating portion 200a functions as a connecting key, while the other functions as a connecting keyway. Specifically, if the first mating portion 21a functions as a connecting key, the second mating portion 200a functions as a connecting keyway; if the first mating portion 21a functions as a connecting keyway, the second mating portion 200a functions as a connecting key.

[0054] At least part of the connecting key is disposed in the connecting key slot. Thus, after the connecting key and the connecting key slot are positioned and matched, the connecting key is restricted by the slot wall of the connecting key slot in both the axial and circumferential directions of the coupling 100, thereby forming a limiting structure.

[0055] It should be noted that the axial direction of the coupling 100 is as follows: Figure 3 or Figure 4 Directions shown in .

[0056] In the coupling of the embodiment of the present application, the sleeve 20 and the connecting shaft 200 are provided with a matching structure of a connecting key and a connecting keyway, thereby enabling the connecting shaft 200 to be limited in the axial and circumferential directions. The torque between the connecting shaft 200 and the coupling 100 is transmitted through the connecting key and the connecting keyway, rather than relying on friction, thereby facilitating improved torque transmission reliability. Furthermore, the coupling body 10 and the sleeve 20 are both split-body structures, and both can be installed radially close to the connecting shaft 200 or removed away from the connecting shaft 200, making assembly and disassembly of the coupling 100 more convenient.

[0057] Furthermore, with the connecting shafts 200 axially constrained, neither connecting shaft 200 is likely to displace axially and collide with the other. This eliminates the need for a rubber plug between the two connecting shafts 200, thereby reducing the noise problem. This improves the efficiency of assembling the coupling 100 and the connecting shafts 200. Furthermore, since no rubber plug is required, the risk of missing a rubber plug is eliminated, creating a fool-proof design.

[0058] For some examples, see Figure 2 The first matching portion 21 a is a connecting key, which extends along the axial direction of the sub-shell 21 , and both ends of the connecting key extend to both ends of the sub-shell 21 respectively.

[0059] In this way, if the sub-shell 21 is produced by injection molding, the mold can be demoulded along the axial direction of the sub-shell 21, and the mold demoulding process will not be affected by the connecting key, thus facilitating the production and molding of the sub-shell 21.

[0060] In addition, when the size of the sub-shell 21 remains unchanged, the size of the connecting key of this structure is longer, which is beneficial to improving the structural strength of the connecting key and thus improving its stability.

[0061] For some examples, see Figure 2 The connecting member 11 is provided with two mounting grooves 11a spaced apart along its axial direction. The groove wall of the mounting groove 11a constitutes the hole wall of the mounting hole 10a. A sub-shell 21 is respectively provided in the two mounting grooves 11a, and the sub-shell 21 is interference fit with the groove wall of the mounting groove 11a.

[0062] Specifically, after the two connecting members 11 are connected, the two mounting grooves 11a on the same circumference together form a mounting hole 10a. Here, the four mounting grooves 11a of the two connecting members 11 together form two coaxially arranged mounting holes 10a.

[0063] In this embodiment, the two sub-shells 21 can be stably mounted on one connecting member 11. Specifically, during the assembly of the coupling 100, one connecting member 11 and two sub-shells 21 constitute an integral component. When there are two connecting members 11, the coupling 100 is composed of two integral components. The two integral components are respectively mounted on the connecting shaft 200 and the two connecting members 11 are connected to complete the assembly of the coupling 100. This assembly structure is relatively simple to operate during assembly, thereby improving the assembly efficiency of the coupling 100.

[0064] In addition, after the coupling 100 is assembled, the sleeve 20 can also be understood as an interference fit with the wall of the mounting hole 10a. During the rotation of the sleeve 20, the friction between the sleeve 20 and the wall of the mounting hole 10a can be used to transmit torque, thereby driving the coupling body 10 to rotate synchronously. That is, there is no need to set up other positioning and matching structures between the sleeve 20 and the coupling body 10, and the synchronous rotation of the two can be achieved. This is conducive to simplifying the structure of the sleeve 20 and the coupling body 10 and reducing the production difficulty of both.

[0065] For some examples, see Figure 2 The connecting member 11 includes a main body 111 and a spacer 112. The main body 111 is provided with a groove extending along the axial direction of the coupling 100, and the two ends of the groove extend to the two ends of the main body 111 respectively. The spacer wall is provided in the groove and divides the groove into two mounting grooves 11a.

[0066] The connecting member 11 may be a main body portion 111 and a spacer portion 112 formed integrally, or the main body portion 111 and the spacer portion 112 may be formed separately and then assembled to obtain the connecting member 11 , and this application does not impose any limitation on this.

[0067] The spacer 112 can separate the two sub-shells 21 so that the two sub-shells 21 do not come into direct contact with each other, thereby helping to reduce the probability of abnormal noise problems occurring in the coupling 100 .

[0068] The specific structure of the spacer 112 is not limited.

[0069] In some embodiments, along the axial projection of the sub-shell 21, the projection of the mounting groove 11a exceeds the outer edge of the projection of the spacer 112. In this way, after the coupling 100 is assembled, the two mounting holes 10a formed at one end close to each other are in a connected state.

[0070] In other embodiments, the projection of the partition wall along the axial direction of the sub-shell 21 completely covers the projection of the mounting groove 11 a . Thus, after the coupling 100 is assembled, the two mounting holes 10 a formed at their adjacent ends are not connected.

[0071] For some examples, see Figure 2、 Figure 4 and Figure 5 Along the circumference of the coupling 100 , one of the two adjacent connecting members 11 is provided with a snap-fit ​​hole 11 b , and the other is provided with a buckle 11 c , which is snap-fitted into the snap-fit ​​hole 11 b .

[0072] Here, adjacent connecting members 11 are connected by a snap-fit ​​structure. This connection structure is relatively simple, and during assembly, the connection between the connecting members 11 can be achieved without the aid of tools, which is easy to operate and therefore helps to improve the assembly efficiency of the coupling 100.

[0073] It should be noted that the specific structure of the clamping hole 11b is not limited. Figure 2 、 Figure 3 and Figure 5 Both ends of the engaging hole 11b are connected to the outside, and the buckle 11c extends from one end of the engaging hole 11b into the engaging hole 11b and engages with the inner wall of the engaging hole 11b. When the coupling 100 needs to be disassembled, a finger can be inserted through the other end of the engaging hole 11b to move the buckle 11c, so that the buckle 11c releases the engagement relationship with the inner wall of the engaging hole 11b, and the buckle 11c can be disengaged from the engaging hole 11b, thus achieving the disassembly of the coupling 100. Here, the operator can also complete the disassembly of the coupling 100 without using tools, which is convenient for the operator to operate and thus helps to improve the disassembly efficiency of the coupling 100.

[0074] For some examples, see Figure 1 and Figure 2 Along the circumference of the mounting hole 10a, two adjacent sub-shells 21 are limitedly matched.

[0075] In this way, based on one shaft sleeve 20, a limiting fit is formed between each sub-shell 21 of the shaft sleeve 20, and the overall stability of the shaft sleeve 20 is better, which is beneficial to improving the reliability and stability of the transmission of the coupling 100.

[0076] It should be noted that the specific structure of the position-limiting cooperation between two adjacent sub-shells 21 is not limited.

[0077] For some examples, see Figure 2 The sub-shell 21 is provided with a positioning portion 21b. Along the circumference of the mounting hole 10a, the positioning portion 21b of one of the two adjacent sub-shells 21 is a positioning pin 21b1, and the positioning portion 21b of the other is a positioning hole 21b2. At least a portion of the positioning pin 21b1 is disposed in the positioning hole 21b2.

[0078] The structures of the positioning pin 21 b 1 and the positioning hole 21 b 2 are relatively simple, which facilitates the production and molding of the sub-shell 21 .

[0079] After the positioning pin 21b1 is inserted into the positioning hole 21b2, the two sub-shells 21 can be positioned. At the same time, the positioning pin 21b1 can also withstand a certain torque, which is beneficial to reduce the torque applied to the connector 11. As a result, the snap 11c has better clamping stability in the clamping hole 11b.

[0080] For some examples, see Figure 2 The sub-shell 21 is provided with a plurality of positioning portions 21b at intervals along its axial direction.

[0081] Here, a plurality of positioning portions 21 b are provided on one sub-shell 21 , and positioning cooperation is achieved between adjacent sub-shells 21 through the plurality of positioning portions 21 b , resulting in a better positioning effect.

[0082] It should be noted that the specific structure of each positioning portion 21b on a sub-shell 21 is not limited. For example, a portion of the positioning portions 21b may be positioning pins 21b1, while another portion of the positioning portions 21b may be positioning holes 21b2; alternatively, all positioning portions 21b may be positioning pins 21b1; and of course, all positioning portions 21b may be positioning holes 21b2.

[0083] In one embodiment, see Figure 2 Each sub-case 21 has two positioning portions 21b on one side of its circumference, one of which is a positioning pin 21b1 and the other is a positioning hole 21b2. Thus, the adjacent sub-case 21 also has a structure with one positioning pin 21b1 and one positioning hole 21b2. This ensures that the positioning portions 21b of the two adjacent sub-cases 21 have a consistent structure, thereby improving the consistency of the sub-cases 21 and facilitating the production of each sub-case 21 using the same processing method or tools. This helps reduce the production cost of the sub-cases 21 and improves the production efficiency of the sub-cases 21.

[0084] In some embodiments, the connecting member 11 is made of a flexible material.

[0085] For example, the connecting member 11 may be a rubber member, a plastic member, or the like.

[0086] For example, the sleeve 20 may be made of aluminum, steel, or the like.

[0087] The connecting piece 11 is made of flexible material. During the assembly of the coupling 100, the coupling body 10 can adapt to the sleeve 20 and produce slight deformation, which facilitates the coaxial setting of the two sleeves 20, thereby helping to improve the vibration and noise problems of the connection system.

[0088] In addition, the connector 11 is made of a flexible material and can produce a certain amount of elastic deformation, thereby facilitating the interference fit between the sub-shell 21 and the groove wall of the mounting groove 11a, and also facilitating the operation of the buckle 11c and causing it to produce a slight deformation to achieve its engagement in the engaging hole 11b or release of the engaging relationship with the engaging hole 11b.

[0089] For some examples, see Figure 2 The groove wall of the connecting keyway extends continuously along its circumference and is connected end to end. In other words, the connecting keyway can be a blind groove or a through groove.

[0090] After the connecting key is inserted into the connecting key slot, there is a slot wall at any position on the circumference of the connecting key slot, which can limit the connecting key. In this way, after the coupling 100 and the connecting shaft 200 are assembled, the stability is better and the reliability is higher.

[0091] A second aspect of an embodiment of the present application provides a connection system, which includes two connecting shafts 200 and a coupling 100 according to any one embodiment of the present application.

[0092] It should be noted that the connection system has all the advantages of the coupling 100 of any of the above embodiments, which will not be described in detail in this application.

[0093] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A coupling, characterized in that: include: The coupling body includes at least two connecting members, each of the connecting members is surrounded by two coaxially arranged mounting holes, one end of the two mounting holes facing away from the other is in communication with the outside, and two adjacent connecting members are connected to each other; Two shaft sleeves are respectively arranged in the two mounting holes. Any shaft sleeve includes at least two sub-shells. The sub-shells are provided with a first matching portion along the radial inner side of the mounting hole. The first matching portion is used to limit the connecting shaft in the axial and circumferential directions. The first matching portion is a connecting key or a connecting keyway.

2. The coupling according to claim 1, characterized in that The first matching portion is a connecting key, which extends along the axial direction of the sub-shell, and two ends of the connecting key extend to two ends of the sub-shell respectively.

3. The coupling according to claim 1, characterized in that The connecting member is provided with two mounting grooves spaced apart along its axial direction, the groove walls of the mounting grooves constitute the hole walls of the mounting hole, a sub-shell is respectively provided in the two mounting grooves, and the sub-shell is interference fit with the groove walls of the mounting grooves.

4. The coupling according to claim 3, characterized in that The connecting member includes a main body and a partition, the main body is provided with a groove extending along the axial direction of the coupling, and the two ends of the groove extend to the two ends of the main body respectively, the partition wall is provided in the groove and divides the groove into two mounting grooves; and / or, Along the circumference of the coupling, one of the two adjacent connecting members is provided with a clamping hole, and the other is provided with a buckle, and the buckle is clamped in the clamping hole.

5. The coupling according to claim 1, wherein: Along the circumference of the mounting hole, two adjacent sub-shells are positionally matched.

6. The coupling according to claim 5, characterized in that The sub-shell is provided with a positioning portion. Along the circumference of the mounting hole, the positioning portion of one of the two adjacent sub-shells is a positioning pin, and the positioning portion of the other sub-shell is a positioning hole. At least a portion of the positioning pin is disposed in the positioning hole.

7. The coupling according to claim 6, characterized in that The sub-shell is provided with a plurality of positioning portions at intervals along the axial direction thereof.

8. The coupling according to claim 1, wherein: The connecting piece is made of flexible material.

9. A connection system, characterized in that: The connection system comprises: Two connecting shafts; The coupling according to any one of claims 1 to 8, wherein the two sleeves are respectively sleeved on the two connecting shafts; Wherein, the connecting shaft is provided with a second matching portion, one of the first matching portion and the second matching portion is a connecting key, and the other is a connecting key slot, and at least a portion of the connecting key is provided in the connecting key slot.

10. The connection system according to claim 9, characterized in that The groove walls of the connecting key groove extend continuously along the circumference thereof and are connected end to end.

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