Coupling

Abstract

The invention discloses a coupler, which relates to the field of coupler design, comprises a connecting half shaft, a limiting connecting unit, a sealing protection unit and an external connecting assembly, and is characterized in that the two connecting half shafts are respectively sleeved with a fixed gear ring, and the two fixed gear rings are connected through the external connecting assembly; sealing protection units are arranged at the positions, located on the outer sides of the fixing gear rings, of the two connecting half shafts, each limiting connecting unit comprises a fixing circular groove, a fixing protruding block, a limiting cylinder, an inserting frame, a buffering damper and a clamping buckle, the fixing circular groove is formed in the position, close to the end face of the fixing gear ring, of one connecting half shaft, and the two connected half shafts are prevented from deviating; the two half shafts are concentric, the service life of the coupler is prolonged, the sealing performance of the internal structure is improved, dust is prevented from entering, and device damage is prevented.

Description

Technical Field

[0001] This invention relates to the field of coupling design, and more particularly to a coupling. Background Technology

[0002] A coupling, also known as a shaft coupling, is a mechanical component used to securely connect the driving and driven shafts in different mechanisms, enabling them to rotate together and transmit motion and torque. It is sometimes also used to connect shafts to other parts (such as gears and pulleys). It is usually composed of two halves, each connected by a key or tight fit to one end of the shaft, and then joined together in some way. Couplings can compensate for misalignment (including axial, radial, angular, or combined misalignment) between two shafts caused by manufacturing or installation inaccuracies, deformation during operation, or thermal expansion; and can also mitigate shocks and absorb vibrations.

[0003] The serpentine spring coupling is an advanced metal structure. It transmits torque using serpentine spring plates. The serpentine spring coupling is currently one of the most advanced shaft connection transmission components in the international mechanical field, and it is also a very common type of shaft connection transmission component. Its main structure consists of two half-couplings, two half-shrouds, two sealing rings, and serpentine spring plates. It transmits torque by the serpentine spring plates embedding into the toothed grooves of the two half-couplings. The coupling uses the serpentine spring plates embedded in the toothed grooves of the two half-couplings to achieve the connection between the driving shaft and the driven shaft.

[0004] Existing couplings have the problem that the two connected half-shafts may misalign, causing non-concentricity and affecting the service life of the coupling. The internal structure has poor sealing, which makes it easy for dust to enter and cause damage to the device. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide a coupling that prevents the two connected half shafts from misaligning, makes the two half shafts concentric, improves the service life of the coupling, improves the internal sealing structure, prevents dust from entering, and prevents damage to the device, thus effectively solving the problems in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a coupling comprising a connecting half-shaft, a limiting connection unit, a sealing and protection unit, and an external connection assembly, characterized in that:

[0007] Connecting half-shafts: A fixed toothed ring is fitted onto each of the two connecting half-shafts. The two fixed toothed rings are connected by an external connecting component. A sealing protection unit is provided on the two connecting half-shafts at the position outside the fixed toothed rings.

[0008] The limiting connection unit includes a fixed circular groove, a fixed protrusion, a limiting cylinder, a plug-in bracket, a buffer damper, and a snap-fit. One connecting half-shaft has a fixed circular groove on its end face near the fixed gear ring, and the other connecting half-shaft has a fixed protrusion on its end face near the fixed gear ring. The fixed protrusion is inserted into the fixed circular groove, which has a cross groove. A limiting circular groove is located at the center of the cross groove. Four buffer dampers in a circular array are arranged in the cross groove, each with a snap-fit. The four snap-fits are located near the limiting circular groove. A limiting cylinder is located at the center of the fixed protrusion, and a plug-in bracket is fixedly fitted onto the limiting cylinder. The plug-in bracket has four plug-in plates in a circular array, which are inserted into their corresponding snap-fits. The limiting cylinder is inserted into the limiting circular groove.

[0009] The connecting half-shaft and the fixed gear ring are matched to connect with the serpentine spring for easy assembly and use. The external connecting component is used for external connection. The sealing and protection unit is used for sealing and protection. The fixed circular groove and the fixed protrusion correspond to make the two connecting half-shafts correspond. The limiting cylinder is used to fix the plug bracket. The plug bracket is used for the snap-fit ​​buckle to connect to the buffer damper. In this way, vibration is eliminated during rotation, making the rotation more stable, improving service life, and making it convenient to use.

[0010] Furthermore, the limiting connection unit also includes a damper fixing plate, a damper, and a fixing top cover. Multiple annular arrays of circular grooves are opened in the fixing circular groove at the edge of the cross groove. A limiting plate is set in each circular groove. A damper fixing plate is respectively set on the fixing protrusion at the position corresponding to the circular groove. A damper is respectively set on each damper fixing plate. A fixing top cover is respectively set on each damper. Each damper is respectively set in the corresponding circular groove. The fixing top cover is in contact with the corresponding limiting plate.

[0011] The damper fixing plate is used to fix the damper, and the damper is used to fix the top cover so that the damper is set in the circular groove for corresponding limit use, so that it can absorb vibration when rotating, making the rotation more stable and convenient to use.

[0012] Furthermore, the limiting connection unit also includes arc-shaped limiting blocks and arc-shaped grooves. Four arc-shaped limiting blocks in a ring array are arranged in the fixed circular groove between the circular groove and the cross groove. Arc-shaped grooves are respectively opened on the fixed protrusion at the positions corresponding to the four arc-shaped limiting blocks. The four arc-shaped limiting blocks are inserted into the corresponding arc-shaped grooves.

[0013] The arc-shaped limiting block and the arc-shaped groove are engaged to make the two connecting half shafts concentric and correspond, making it convenient to connect and use them.

[0014] Furthermore, the limiting connection unit also includes limiting blocks and limiting grooves. One of the fixed toothed rings has four limiting grooves arranged in a ring array on its end face, and the other fixed toothed ring has four equally spaced limiting blocks on its end face. The four limiting blocks are inserted into the corresponding limiting grooves.

[0015] The limiting block and the limiting groove are engaged to limit the two fixed toothed rings, making it easy to splice and use them concentrically.

[0016] Furthermore, the sealing and protection unit includes a protective cover, a wear-resistant pattern, and a sealing strip. Two protective covers are provided at the position of the two connecting half shafts located at the edge of the fixed tooth ring. The outer surface of the two protective covers is respectively provided with a wear-resistant pattern. Sealing strips are respectively fitted on the two protective covers at the connection point of the connecting half shafts. All sealing strips are in contact with the corresponding connecting half shafts.

[0017] The protective cover is used for protection, the wear-resistant pattern is used to increase friction and extend the service life of the protective cover, and the sealing strip is used to seal the connection of the half shaft to improve the sealing performance and facilitate use.

[0018] Furthermore, the sealing and protection unit also includes a sealing gasket, a sealing strip, and a sealing groove. Two sealing gaskets are provided between the two protective covers, and sealing strips are provided on the upper and lower sides of the two sealing gaskets respectively. A sealing groove is opened on one side between the two protective covers, and all the sealing grooves are engaged with the corresponding sealing strips.

[0019] The sealing strip and sealing groove interlock to allow the sealing gasket to be placed between the two protective covers, thereby facilitating sealing and preventing dust from entering the interior.

[0020] Furthermore, the sealing and protection unit also includes connecting rings and arc-shaped sealing strips. A connecting ring is fixedly sleeved on each of the two connecting half shafts. Two equally spaced arc-shaped sealing grooves are opened on the non-corresponding side of the two connecting rings. An arc-shaped sealing strip is provided on the left and right sides of the two protective covers. The four arc-shaped sealing strips are respectively engaged with the corresponding arc-shaped sealing grooves.

[0021] The arc-shaped sealing strip engages with the arc-shaped sealing groove on the connecting ring to provide a seal and prevent dust from entering the interior.

[0022] Furthermore, the sealing and protection unit also includes tapered bolts and sealing gaskets. The two protective covers are connected by four tapered bolts, and a sealing gasket is fitted onto each tapered bolt.

[0023] Tapered bolts are used to connect two protective covers, thereby fixing the protective covers to the connecting half-shaft for protection. Sealing gaskets are used for sealing and protection, making the fixation more secure and convenient for use.

[0024] Furthermore, the external connection assembly includes a serpentine spring and a protective bellows, with the two fixed toothed rings being snapped together by a serpentine spring, and a protective bellows being fitted onto the outer surface of the serpentine spring.

[0025] The serpentine spring is used to connect two half-shafts, thereby preventing vibration during rotation, making the rotation more stable, and facilitating use. The protective bellows is used to increase the service life of the serpentine spring and to absorb vibration.

[0026] Furthermore, the external connection assembly also includes a keyway, an external connection flange, and fixing screw holes. An outer connection hole is opened on the non-corresponding side of the two connecting half shafts, and a keyway is provided in each of the two outer connection holes. An external connection flange is fitted onto each of the two connecting half shafts, and multiple fixing screw holes in an annular array are opened on each external connection flange.

[0027] The keyway is used to facilitate connection with external parts and prevent the external connecting shaft from rotating. The external connecting flange is used for external connection, and the fixing screw hole is used for bolt connection.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] 1. This coupling has the following advantages: It is equipped with a limit connection unit. The two connecting half shafts are aligned by the corresponding fixed circular groove and fixed protrusion. The limit cylinder is used to fix the plug bracket, which is used for the snap-fit ​​buckle to facilitate connection with the buffer damper. The damper fixing plate is used to fix the damper, and the damper is used to fix the fixed top cover, so that the damper is set in the circular groove for corresponding limit use, so as to absorb vibration during rotation. The arc-shaped limit block and arc-shaped groove snap together to make the two connecting half shafts concentrically aligned. The limit block and limit groove snap together to limit the two fixed toothed rings, so as to facilitate splicing and concentric alignment, and facilitate quick installation and use.

[0030] 2. This coupling has the following advantages: It is equipped with a sealing and protection unit, which is used for protection through the protective cover. The wear-resistant pattern is used to increase friction and improve the service life of the protective cover. The sealing strip is used to seal the connection of the connecting half shaft. The sealing strip and the sealing groove are engaged to allow the sealing gasket to be placed between the two protective covers, thereby facilitating the sealing use. The arc-shaped sealing strip is engaged with the arc-shaped sealing groove on the connecting ring for sealing and protection. The tapered bolt is used to connect the two protective covers to fix the protective cover on the connecting half shaft for protection. The sealing gasket is used for sealing and protection.

[0031] 3. This coupling has the following advantages: it prevents the two connected half shafts from misaligning, keeps the two half shafts concentric, improves the service life of the coupling, enhances the sealing of the internal structure, prevents dust from entering, and prevents damage to the device. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the front structure of the invention;

[0033] Figure 2 This is a schematic diagram of the front cross-sectional structure of the invention;

[0034] Figure 3 This is a schematic diagram of the left side structure of the invention connecting half-shaft;

[0035] Figure 4 This is a schematic diagram of the right side structure of the invention connecting half-shaft;

[0036] Figure 5 This is a partial structural diagram of the invention's limiting connection unit;

[0037] Figure 6 This is a partial cross-sectional view of the invention's sealing and protection unit.

[0038] Figure 7 This is a schematic diagram of the internal structure of the serpentine spring.

[0039] Figure 8 This is a schematic diagram of the invention of the serpentine spring structure.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1 Connecting half shaft, 2 Fixed gear ring, 3 Limiting connection unit, 31 Limiting block, 32 Limiting groove, 33 Fixed circular groove, 34 Fixed protrusion, 35 Damper fixing plate, 36 Damper, 37 Fixed top cover, 38 Limiting cylinder, 39 Plug-in bracket, 310 Buffer damper, 311 Snap-fit ​​buckle, 312 Arc-shaped limiting block, 313 Arc-shaped groove, 4 Sealing protection unit, 41 Protective cover, 42 Wear-resistant pattern, 43 Sealing strip, 44 Connecting ring, 45 Arc-shaped sealing strip, 46 Tapered bolt, 47 Sealing gasket, 48 Sealing strip, 49 Sealing groove, 410 Sealing gasket, 5 External connection assembly, 51 Snake spring, 52 Protective bellows, 53 Keyway, 54 External connection flange, 55 Fixed screw hole. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Please see Figure 1-8 This embodiment provides a technical solution: a coupling, comprising a connecting half-shaft 1, a limiting connection unit 3, a sealing and protection unit 4, and an external connection assembly 5, characterized in that:

[0044] Connecting half-shaft 1: A fixed toothed ring 2 is fitted onto each of the two connecting half-shafts 1. The two fixed toothed rings 2 are connected by an external connecting component 5. A sealing protection unit 4 is provided on the two connecting half-shafts 1 at the position outside the fixed toothed ring 2.

[0045] Limiting connection unit 3 includes a fixing groove 33, a fixing protrusion 34, a limiting cylinder 38, a plug-in bracket 39, a buffer damper 310, and a snap-fit ​​buckle 311. One connecting half-shaft 1 has a fixing groove 33 on its end face near the fixing gear ring 2. The other connecting half-shaft 1 has a fixing protrusion 34 on its end face near the fixing gear ring 2. The fixing protrusion 34 is inserted into the fixing groove 33. A cross groove is formed in the fixing groove 33, and a limiting cylinder is formed at the center of the cross groove. The groove has four annular arrays of buffer dampers 310 arranged in the cross groove. Each buffer damper 310 is provided with a snap-fit ​​buckle 311. The four snap-fit ​​buckles 311 are located near the limiting circular groove. A limiting cylinder 38 is provided at the center of the fixing protrusion 34. A plug-in bracket 39 is fixedly sleeved on the limiting cylinder 38. The plug-in bracket 39 is provided with four annular arrays of plug-in plates. The four plug-in plates are inserted into the corresponding snap-fit ​​buckles 311. The limiting cylinder 38 is inserted into the limiting circular groove.

[0046] The connecting half-shaft 1 and the fixed gear ring 2 are matched to connect with the serpentine spring 51 for easy assembly and use. The external connecting component 5 is used for external connection. The sealing and protection unit 4 is used for sealing and protection. The fixed circular groove 33 and the fixed protrusion 34 correspond to each other so that the two connecting half-shafts 1 are aligned. The limiting cylinder 38 is used to fix the plug bracket 39. The plug bracket 39 is used to plug into the snap fastener 311 to facilitate connection with the buffer damper 310. Thus, vibration is eliminated during rotation, making the rotation more stable, improving service life, and facilitating use.

[0047] The limiting connection unit 3 also includes a damper fixing plate 35, a damper 36, and a fixing top cover 37. Multiple annular arrays of circular grooves are opened in the fixing circular groove 33 at the edge of the cross groove. A limiting plate is set in each circular groove. A damper fixing plate 35 is set on the fixing protrusion 34 at the corresponding position of the circular groove. A damper 36 is set on each damper fixing plate 35. A fixing top cover 37 is set on each damper 36. Each damper 36 is set in the corresponding circular groove. The fixing top cover 37 is in contact with the corresponding limiting plate.

[0048] The damper fixing plate 35 is used to fix the damper 36, and the damper 36 is used to fix the top cover 37 so that the damper 36 is set in the circular groove for corresponding limit use, so that it can absorb vibration when rotating, making the rotation more stable and convenient to use.

[0049] The limiting connection unit 3 also includes an arc-shaped limiting block 312 and an arc-shaped groove 313. Four arc-shaped limiting blocks 312 in a ring array are arranged in the fixed circular groove 33 between the circular groove and the cross groove. Arc-shaped grooves 313 are respectively opened on the fixed protrusion 34 at the corresponding positions of the four arc-shaped limiting blocks 312. The four arc-shaped limiting blocks 312 are inserted into the corresponding arc-shaped grooves 313.

[0050] The arc-shaped limiting block 312 and the arc-shaped groove 313 are engaged to make the two connecting half shafts 1 concentric and correspond, which facilitates connection and use.

[0051] The limiting connection unit 3 also includes limiting blocks 31 and limiting grooves 32. One of the fixed toothed rings 2 has four ring-shaped limiting grooves 32 on its end face, and the other fixed toothed ring 2 has four equally spaced limiting blocks 31 on its end face. The four limiting blocks 31 are inserted into the corresponding limiting grooves 32.

[0052] The limiting block 31 and the limiting groove 32 are engaged to limit the two fixed toothed rings 2, so as to facilitate splicing and use, and to facilitate concentric use.

[0053] The sealing and protection unit 4 includes a protective cover 41, a wear-resistant pattern 42, and a sealing strip 43. Two protective covers 41 are provided at the position of the two connecting half shafts 1 on the edge of the fixed toothed ring 2. The outer surface of the two protective covers 41 is respectively provided with a wear-resistant pattern 42. A sealing strip 43 is respectively sleeved on the two protective covers 41 at the connection of the connecting half shafts 1. All the sealing strips 43 are in contact with the corresponding connecting half shafts 1.

[0054] The protective cover 41 is used for protection, the wear-resistant pattern 42 is used to increase friction and improve the service life of the protective cover 41, and the sealing strip 43 is used to seal the connection of the connecting half shaft 1 to improve the sealing performance and facilitate use.

[0055] The sealing and protection unit 4 also includes a sealing gasket 47, a sealing strip 48 and a sealing groove 49. Two sealing gaskets 47 are provided between the two protective covers 41. Sealing strips 48 are provided on the upper and lower sides of the two sealing gaskets 47 respectively. A sealing groove 49 is opened on one side between the two protective covers 41. All sealing grooves 49 are engaged with the corresponding sealing strips 48.

[0056] The sealing strip 48 and the sealing groove 49 engage to allow the sealing gasket 47 to be positioned between the two protective covers 41, thereby facilitating sealing and preventing dust from entering the interior.

[0057] The sealing and protection unit 4 also includes a connecting ring 44 and an arc-shaped sealing strip 45. A connecting ring 44 is fixedly sleeved on each of the two connecting half shafts 1. Two equally spaced arc-shaped sealing grooves are opened on the non-corresponding side of the two connecting rings 44. An arc-shaped sealing strip 45 is provided on the left and right sides of the two protective covers 41. The four arc-shaped sealing strips 45 are respectively engaged with the corresponding arc-shaped sealing grooves.

[0058] The arc-shaped sealing strip 45 engages with the arc-shaped sealing groove on the connecting ring 44 to provide sealing protection and prevent dust from entering the interior.

[0059] The sealing and protection unit 4 also includes tapered bolts 46 and sealing gaskets 410. The two protective covers 41 are connected by four tapered bolts 46 respectively, and a sealing gasket 410 is fitted on each tapered bolt 46.

[0060] The tapered bolt 46 is used to connect the two protective covers 41, so that the protective covers 41 are fixed on the connecting half shaft 1 for protection. The sealing gasket 410 is used for sealing and protection, so that the fixation is more secure and convenient for use.

[0061] The external connection component 5 includes a serpentine spring 51 and a protective bellows 52. The two fixed toothed rings 2 are snapped together by a serpentine spring 51, and a protective bellows 52 is sleeved on the outer surface of the serpentine spring 51.

[0062] The serpentine spring 51 is used to connect the two half-shafts, thereby preventing vibration during rotation, making the rotation more stable, and facilitating use. The protective bellows 52 is used to increase the service life of the serpentine spring 51 and to absorb vibration.

[0063] The external connection assembly 5 also includes a keyway 53, an external connection flange 54 and fixing screw holes 55. An outer connection hole is opened on the non-corresponding side of the two connecting half shafts 1. A keyway 53 is provided in the two outer connection holes. An external connection flange 54 is fitted on each of the two connecting half shafts 1. Multiple fixing screw holes 55 in an annular array are opened on each external connection flange 54.

[0064] The keyway 53 is used to facilitate connection with the outside and prevent the external connecting shaft from rotating. The external connecting flange 54 is used for external connection, and the fixing screw hole 55 is used for bolt connection to connect with the outside.

[0065] The working principle of the coupling provided by this invention is as follows: First, the two connecting half-shafts 1 are aligned by the corresponding fixed circular groove 33 and fixed protrusion 34. The limiting cylinder 38 is used to fix the plug-in bracket 39, which is used to insert the snap-fit ​​buckle 311 to facilitate connection with the buffer damper 310. The damper fixing plate 35 is used to fix the damper 36, which is used to fix the fixed top cover 37, so that the damper 36 is set in the circular groove for corresponding limiting use, so as to absorb vibration during rotation. The arc-shaped limiting block 312 and the arc-shaped groove 313 are engaged to make the two connecting half-shafts 1 concentrically aligned. The limiting block 31 and the limiting groove 32 are engaged to limit the two fixed toothed rings 2, so as to facilitate splicing and concentric alignment. At the same time, the connection is achieved by the serpentine spring 51, and then the protective cover 4 is used for connection. 1. For protective use, wear-resistant pattern 42 is used to increase friction and improve the service life of protective cover 41. Sealing strip 43 is used to seal the connection of connecting half shaft 1. Sealing strip 48 and sealing groove 49 are snapped together to allow sealing gasket 47 to be placed between the two protective covers 41, thereby facilitating sealing. Arc-shaped sealing strip 45 is snapped together with arc-shaped sealing groove on connecting ring 44 for sealing and protection. Tapered bolt 46 is used to connect the two protective covers 41 to fix the protective cover 41 on connecting half shaft 1 for protection. Sealing gasket 410 is used for sealing and protection. Finally, keyway 53 is used to facilitate connection with the outside and prevent the external connecting shaft from rotating. External connecting flange 54 is used for external connection and assembly.

[0066] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A coupling comprising a connecting half-shaft (1), a limiting connection unit (3), a sealing and protection unit (4), and an external connection assembly (5), characterized in that: Connecting half shaft (1): A fixed toothed ring (2) is fitted on each of the two connecting half shafts (1). The two fixed toothed rings (2) are connected by an external connecting component (5). A sealing protection unit (4) is provided on the two connecting half shafts (1) at the position outside the fixed toothed ring (2). Limiting connection unit (3): includes a fixed circular groove (33), a fixed protrusion (34), a limiting cylinder (38), a plug-in bracket (39), a buffer damper (310), and a snap-fit ​​buckle (311). One of the connecting half shafts (1) has a fixed circular groove (33) on its end face near the fixed gear ring (2), and the other connecting half shaft (1) has a fixed protrusion (34) on its end face near the fixed gear ring (2). The fixed protrusion (34) is inserted into the fixed circular groove (33). A cross groove is formed in the fixed circular groove (33), and a cross groove is formed at the center of the cross groove. The limiting groove has four annular arrays of buffer dampers (310) arranged in the cross groove. Each buffer damper (310) has a snap-fit ​​buckle (311) arranged on it. The four snap-fit ​​buckles (311) are located near the limiting groove. The fixing protrusion (34) has a limiting cylinder (38) arranged at the center. A plug-in bracket (39) is fixedly sleeved on the limiting cylinder (38). The plug-in bracket (39) has four annular arrays of plug-in plates arranged on it. The four plug-in plates are inserted into the corresponding snap-fit ​​buckles (311). The limiting cylinder (38) is inserted into the limiting groove.

2. The coupling according to claim 1, characterized in that: The limiting connection unit (3) also includes a damper fixing plate (35), a damper (36) and a fixed top cover (37). The fixed circular groove (33) has multiple circular grooves arranged in an annular array at the edge of the cross groove. Each circular groove is provided with a limiting plate. The fixed protrusion (34) is provided with a damper fixing plate (35) at the corresponding position of the circular groove. Each damper fixing plate (35) is provided with a damper (36). Each damper (36) is provided with a fixed top cover (37). Each damper (36) is provided in the corresponding circular groove. The fixed top cover (37) is in contact with the corresponding limiting plate.

3. A coupling according to claim 2, characterized in that: The limiting connection unit (3) also includes an arc-shaped limiting block (312) and an arc-shaped groove (313). Four arc-shaped limiting blocks (312) in a ring array are arranged in the fixed circular groove (33) between the circular groove and the cross groove. Arc-shaped grooves (313) are respectively opened on the fixed protrusion (34) at the positions corresponding to the four arc-shaped limiting blocks (312). The four arc-shaped limiting blocks (312) are inserted into the corresponding arc-shaped grooves (313).

4. A coupling according to claim 3, characterized in that: The limiting connection unit (3) also includes limiting blocks (31) and limiting grooves (32). One of the fixed toothed rings (2) has four ring-shaped limiting grooves (32) on its end face, and the other fixed toothed ring (2) has four equally spaced limiting blocks (31) on its end face. The four limiting blocks (31) are inserted into the corresponding limiting grooves (32).

5. A coupling according to claim 1, characterized in that: The sealing and protection unit (4) includes a protective cover (41), a wear-resistant pattern (42), and a sealing strip (43). Two protective covers (41) are provided at the position of the two connecting half shafts (1) at the edge of the fixed toothed ring (2). The outer surfaces of the two protective covers (41) are respectively provided with wear-resistant patterns (42). Sealing strips (43) are respectively sleeved on the two protective covers (41) at the connection of the connecting half shafts (1). All the sealing strips (43) are in contact with the corresponding connecting half shafts (1).

6. A coupling according to claim 5, characterized in that: The sealing and protective unit (4) also includes a sealing gasket (47), a sealing strip (48) and a sealing groove (49). Two sealing gaskets (47) are provided between the two protective covers (41). Sealing strips (48) are provided on the upper and lower sides of the two sealing gaskets (47). Sealing grooves (49) are opened on one side between the two protective covers (41). All sealing grooves (49) are engaged with the corresponding sealing strips (48).

7. A coupling according to claim 5, characterized in that: The sealing and protection unit (4) also includes a connecting ring (44) and an arc-shaped sealing strip (45). A connecting ring (44) is fixedly sleeved on each of the two connecting half shafts (1). Two equally spaced arc-shaped sealing grooves are opened on the non-corresponding side of the two connecting rings (44). An arc-shaped sealing strip (45) is provided on the left and right sides of the two protective covers (41). The four arc-shaped sealing strips (45) are respectively engaged with the corresponding arc-shaped sealing grooves.

8. A coupling according to claim 5, characterized in that: The sealing and protective unit (4) also includes a tapered bolt (46) and a sealing gasket (410). The two protective covers (41) are connected by four tapered bolts (46) respectively, and a sealing gasket (410) is fitted on each tapered bolt (46).

9. A coupling according to claim 1, characterized in that: The external connection assembly (5) includes a serpentine spring (51) and a protective bellows (52). The two fixed toothed rings (2) are snapped together by a serpentine spring (51), and a protective bellows (52) is sleeved on the outer surface of the serpentine spring (51).

10. A coupling according to claim 9, characterized in that: The external connection assembly (5) also includes a keyway (53), an external connection flange (54) and fixing screw holes (55). An outer connection hole is opened on the non-corresponding side of the two connecting half shafts (1), and a keyway (53) is provided in the two outer connection holes. An external connection flange (54) is sleeved on the two connecting half shafts (1), and a plurality of fixing screw holes (55) in an annular array are opened on each external connection flange (54).

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