Curved jaw coupling

Abstract

The application discloses a curved jaw coupling, which comprises a first half coupling, a second half coupling and an elastic piece. The first half coupling and the second half coupling are both cylindrical. A plurality of first bosses are protruded from the end surface of one end of the first half coupling at equal intervals in the circumferential direction. A plurality of second bosses are protruded from the end surface of one end of the second half coupling at equal intervals in the circumferential direction. The first half coupling is coaxially connected with the second half coupling. The adjacent first boss and the second boss are matched to form a placing cavity. The elastic piece is detachably installed in the placing cavity along the radial direction of the first half coupling. The elastic piece is attached to the first boss in the circumferential direction of the first half coupling and is attached to the second boss in the circumferential direction of the second half coupling. When the elastic piece needs to be replaced due to wear, the elastic piece only needs to be detached along the radial direction of the first half coupling, and no alignment operation is needed, so that the efficiency of replacing the elastic element is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of couplings, in particular to a curved jaw coupling. BACKGROUND

[0002] A coupling is a mechanical device used to fasten together rotating shafts of different mechanisms to rotate together and transmit motion and torque. A coupling is often composed of two half couplings, which are usually fastened to the ends of two shafts by keys or tight fits, and then connected by bolts or other means. The coupling can compensate for the misalignment (including axial misalignment, radial misalignment, angular misalignment or comprehensive misalignment) between the two shafts due to manufacturing and installation inaccuracies, deformation during operation or thermal expansion, and can also absorb impact and vibration.

[0003] A jaw coupling, also known as a plum blossom coupling, is composed of two metal jaw plates and an elastic body. The jaw coupling uses a plum blossom-shaped elastic element to be placed between the two shaft sleeves to achieve the connection of the two shaft sleeves. The plum blossom coupling has the characteristics of compensating for the relative displacement of the two shafts, reducing vibration, buffering, small radial size, simple structure, no lubrication, high load capacity, easy maintenance, etc.

[0004] The elastic element of the jaw coupling is a consumable part that needs to be replaced in time when damaged. Each time the elastic element is replaced, the two half couplings need to be separated along the axial direction, and then reconnected after the new elastic element is replaced. In order to avoid the phenomenon that the inertia main shaft of the coupling does not coincide with its rotation axis, causing shaft vibration, which in turn causes shaft deformation, bearing damage, etc., affecting the normal operation of the equipment and the service life of the equipment, the two half couplings need to be aligned each time they are reconnected, resulting in low efficiency each time the elastic element is replaced. SUMMARY

[0005] In order to improve the low efficiency of replacing the elastic element of the jaw coupling, the present application provides a curved jaw coupling.

[0006] The curved jaw coupling provided by the present application adopts the following technical solution:

[0007] The curved jaw coupling comprises a first half coupling, a second half coupling and an elastic member, the first half coupling and the second half coupling are both cylindrical, a plurality of first bosses are outwardly protruded on the end face of one end of the first half coupling at equal intervals in the circumferential direction, first matching grooves are formed between adjacent first bosses, a plurality of second bosses are outwardly protruded on the end face of one end of the second half coupling at equal intervals in the circumferential direction, second matching grooves are formed between adjacent second bosses, the number of the first bosses is equal to the number of the second bosses, the first half coupling is coaxially connected with the second half coupling, the first bosses are located in the second matching grooves and abut against the groove bottoms of the second matching grooves, the second bosses are located in the first matching grooves and abut against the groove bottoms of the first matching grooves, the first bosses and the second bosses that are adjacent to each other match to form a placement cavity, the elastic member is detachably installed in the placement cavity in the radial direction of the first half coupling, the elastic member is attached to the first bosses in the circumferential direction of the first half coupling and is attached to the second bosses in the circumferential direction of the second half coupling.

[0008] By adopting the above technical scheme, the first half coupling and the second half coupling are coaxially connected, and the elastic member is used to fix the first half coupling and the second half coupling in the circumferential direction, so that the first half coupling and the second half coupling can synchronously rotate. When the elastic member needs to be replaced due to wear, the elastic member only needs to be detached in the radial direction of the first half coupling, the elastic member can be replaced without moving the first half coupling and the second half coupling, and no alignment operation is needed, so that the efficiency of replacing the elastic member is improved.

[0009] Optionally, the width of the slot opening of the first matching groove is greater than the width of the groove bottom of the first matching groove, and the width of the slot opening of the second matching groove is greater than the width of the groove bottom of the second matching groove.

[0010] By adopting the above technical scheme, the elastic member is conveniently installed in the radial direction of the first half coupling.

[0011] Optionally, the elastic member comprises an elastic band and a plurality of elastic bosses, the elastic bosses are matched with the placement cavity, the plurality of elastic bosses are uniformly arranged along the length direction of the elastic band, the elastic band is wound on the side wall of the first half coupling and is in over-matching with the side wall of the first half coupling, the elastic bosses enter the placement cavity and are attached to the first bosses in the circumferential direction of the first half coupling and are attached to the second bosses in the circumferential direction of the second half coupling, the elastic band is provided with a limiting ring, and the limiting ring is slidably connected with the first half coupling in the axial direction of the first half coupling.

[0012] By adopting the technical scheme, when the elastic member is installed, the elastic belt only needs to be wound on the first half-coupling, and the elastic protrusions are arranged in the accommodation cavities one by one, without the need to move the first half-coupling and the second half-coupling. The limiting ring can also ensure that the elastic belt does not separate from the first half-coupling during rotation.

[0013] Optionally, the two side walls of the limiting ring in the axial direction are respectively outwardly protruded with a plurality of first limiting blocks and a plurality of second limiting blocks, the first limiting blocks are uniformly distributed along the circumferential direction of the limiting ring, the second limiting blocks are uniformly distributed along the circumferential direction of the limiting ring, and the first limiting blocks and the second limiting blocks respectively abut against the two side walls in the width direction of the elastic belt.

[0014] By adopting the technical scheme, the first limiting blocks and the second limiting blocks can axially fixedly connect the limiting ring to the elastic belt, to prevent the limiting ring from sliding along the axial direction of the first half-coupling and separating from the elastic belt during rotation.

[0015] Optionally, the limiting ring is rotationally connected to the elastic belt, the second limiting blocks are staggered distributed along the circumferential direction of the limiting ring and the first limiting blocks, a surface of the elastic belt away from the first protrusions is provided with a plurality of first guide grooves matched with the first limiting blocks along the width direction of the elastic belt, the plurality of first guide grooves are uniformly arranged along the length direction of the elastic belt, the second limiting blocks are matched with the first guide grooves, a plurality of clamping blocks are outwardly protruded on the two side walls in the width direction of the elastic belt, the clamping blocks are located on the two side walls of the first guide grooves, and the clamping blocks are made of elastic material.

[0016] By adopting the technical scheme, during synchronous rotation of the first half-coupling and the second half-coupling, the first limiting blocks and the second limiting blocks abut against the side walls in the width direction of the elastic belt, and the clamping blocks can limit the first limiting blocks and the second limiting blocks from entering the first guide grooves during rotation. When the elastic member needs to be replaced, because the clamping blocks are elastic, the limiting ring can still be rotated to a position where the first limiting blocks and the first guide grooves are axially aligned, and the limiting ring can be slid along the axial direction of the first half-coupling towards the second half-coupling, so that the limiting ring can be separated from the elastic belt. The limiting ring can also be rotated to a position where the second limiting blocks and the first guide grooves are axially aligned, and the limiting ring can be slid along the axial direction of the first half-coupling towards the first half-coupling, so that the limiting ring can be separated from the elastic belt. When the replacement of the elastic member is completed, only the first limiting blocks or the second limiting blocks need to be aligned with the first guide grooves, and then the limiting ring needs to be slid along the axial direction of the first half-coupling to a position where the limiting ring is attached to the elastic belt, and then the limiting ring needs to be rotated so that the first limiting blocks and the second limiting blocks are staggered with the first guide grooves.

[0017] Optionally, the inner wall of the limiting ring is circumferentially and uniformly provided with a plurality of limiting members, the surface of the elastic band away from the first boss is provided with a plurality of positioning holes matched with the limiting members, the positioning holes are uniformly arranged along the length direction of the elastic band, and the limiting members are inserted into the positioning holes.

[0018] By adopting the above technical scheme, the relative fixation of the limiting ring and the elastic band is realized through the cooperation of the limiting members and the positioning holes, and the elastic band is prevented from being separated from the first half-coupling during rotation.

[0019] Optionally, the surface of the elastic band away from the first boss is provided with a plurality of second guide grooves along the width direction of the elastic band, the second guide grooves are uniformly arranged along the length direction of the elastic band, the second guide grooves are communicated with the positioning holes, and the limiting members are rotated into the second guide grooves and are in sliding connection with the second guide grooves.

[0020] By adopting the above technical scheme, when the elastic member needs to be replaced, the limiting member is rotated into the second guide groove, the limiting ring is slid along the axial direction of the first half-coupling, and the limiting ring and the elastic band can be separated.

[0021] Optionally, the elastic member comprises a plurality of elastic blocks, the elastic blocks are matched with the accommodation cavities, the elastic blocks are installed in the accommodation cavities along the radial direction of the first half-coupling, and are matched with the first boss along the circumferential direction of the first half-coupling and the second boss along the circumferential direction of the second half-coupling.

[0022] By adopting the above technical scheme, the elastic blocks are installed in the accommodation cavities, the first half-coupling and the second half-coupling can be fixed in the circumferential direction, and synchronous rotation of the first half-coupling and the second half-coupling is ensured.

[0023] Optionally, a fixing ring is further included, the fixing ring is sleeved on the first half-coupling and connected with the first half-coupling, and wraps the elastic member.

[0024] By adopting the above technical scheme, the fixing ring limits the movement of the elastic member in the radial direction of the first half-coupling, so as to prevent the elastic member from being separated from the accommodation cavity during rotation.

[0025] Optionally, the first half-coupling is provided with a first equipment shaft through hole, the first equipment shaft through hole is coaxial with the first half-coupling, the second half-coupling is provided with a second equipment shaft through hole, the second equipment shaft through hole is coaxial with the second half-coupling, the inner wall of the first equipment shaft through hole is provided with a first key groove along the axial direction of the first half-coupling, the first key groove extends to the end face of the first half-coupling, the position of the first key groove corresponds to the position of the first boss, the first key groove is used for fixing the first half-coupling and the equipment shaft in the circumferential direction, the inner wall of the second equipment shaft through hole is provided with a second key groove along the axial direction of the second half-coupling, the second key groove extends to the end face of the second half-coupling, the position of the second key groove corresponds to the position of the second boss, and the second key groove is used for fixing the second half-coupling and the equipment shaft in the circumferential direction.

[0026] By adopting the technical scheme, the connecting part of the equipment shaft penetrates into the coupling, and is fixed and connected with the coupling in the circumferential direction through the key groove. The length of the key groove is compensated by the length of the first boss and the second boss in the axial direction of the coupling, so that the matching length of the coupling and the equipment shaft is reduced, and then the length of the coupling is reduced, and the production cost of the product is reduced.

[0027] In summary, the present application has at least one of the following beneficial technical effects:

[0028] 1. By adopting the elastic member which can be radially installed in the installation cavity, when the elastic member needs to be replaced due to wear, the elastic member only needs to be disassembled along the radial direction of the first half-coupling, without moving the first half-coupling and the second half-coupling, the elastic member can be replaced, and no re-alignment operation is required, thereby improving the efficiency of replacing the elastic member.

[0029] 2. By cooperation of the elastic member and the limiting ring, the elastic member is prevented from being separated from the first half-coupling during rotation, and when the elastic member needs to be replaced, the limiting ring only needs to be moved along the axial direction of the first half-coupling, so that the elastic member can be replaced. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is an explosion of a curved jaw coupling Figure One .

[0031] Figure 2 is a schematic view of an expanded state of an elastic belt.

[0032] Figure 3 is an explosion of a curved jaw coupling Figure Two .

[0033] Figure 4 is an explosion of a curved jaw coupling Figure Three .

[0034] Figure 5 is an explosion of a curved jaw coupling Figure Four .

[0035] Figure 6 is an explosion of a curved jaw coupling Figure Five .

[0036] The figure mark explanation: 1, first half coupling; 11, first boss; 12, first matching groove; 13, first equipment shaft through hole; 14, bearing platform; 2, second half coupling; 21, second boss; 22, second matching groove; 23, second equipment shaft through hole; 3, elastic piece; 31, elastic band; 311, first guide groove; 312, second guide groove; 313, positioning hole; 32, elastic block; 33, elastic block; 34, clamping block; 4, installation cavity; 5, limiting ring; 51, first limiting block; 52, second limiting block; 53, limiting piece; 531, limiting screw hole; 532, limiting screw; 533, third limiting block; 6, fixed ring; 7, first key groove; 8, second key groove. DETAILED DESCRIPTION

[0037] The application will be further described in detail below in combination with the drawings.

[0038] The curved jaw coupling disclosed by the embodiment of the application comprises a first half coupling 1, a second half coupling 2 and an elastic piece 3.

[0039] Referring to Figure 1 and Figure 3 , the first half coupling 1 and the second half coupling 2 are both cylindrical, a plurality of first bosses 11 are outwardly protruded on the end face of one end of the first half coupling 1 at equal intervals in the circumferential direction, and a plurality of second bosses 21 are outwardly protruded on the end face of one end of the second half coupling 2 at equal intervals in the circumferential direction. In different embodiments, the first half coupling 1 can outwardly protrude to form different numbers of first bosses 11, can form two first bosses 11, can form three first bosses 11, or can form four first bosses 11, as an example, Figure 1The first half-coupling 1 in the shown embodiment is externally convex with four first bosses 11. It is worth noting that the second half-coupling 2 paired with the first half-coupling 1 is externally convex with the number of second bosses 21 consistent with the number of first bosses 11. When assembled, the first bosses 11 are located in the second matching grooves 22 and abut the groove bottoms of the second matching grooves 22, the second bosses 21 are located in the first matching grooves 12 and abut the groove bottoms of the first matching grooves 12, the adjacent first bosses 11 and second bosses 21 cooperate to form the installation cavities 4 for installing the elastic members 3. In different embodiments, the first half-coupling 1 and the second half-coupling 2 can be made of different materials, as long as they have sufficient hardness and rigidity, for example, the first half-coupling 1 and the second half-coupling 2 are both made of steel.

[0040] In order to facilitate the elastic member 3 to be installed in the installation cavity 4 along the radial direction of the first half-coupling 1, a first matching groove 12 is formed between adjacent first bosses 11, the width of the groove opening of the first matching groove 12 is greater than the width of the groove bottom of the first matching groove 12, and a second matching groove 22 is formed between adjacent second bosses 21, the width of the groove opening of the second matching groove 22 is greater than the width of the groove bottom of the second matching groove 22.

[0041] Referring to Figure 1 and Figure 2 , in order to be able to replace the elastic member 3 without moving the first half-coupling 1 and the second half-coupling 2, and improve the efficiency of replacing the elastic member 3, a specific but non-limiting embodiment of the elastic member 3 which can be detachably installed in the installation cavity 4 along the radial direction of the first half-coupling 1 is proposed, the elastic member 3 includes an elastic band 31 and a plurality of elastic blocks 32, the elastic blocks 32 are matched with the installation cavity 4, and the plurality of elastic blocks 32 are uniformly arranged along the length direction of the elastic band 31. In different embodiments, the number of elastic blocks 32 is determined according to the number of first bosses 11 and second bosses 21, when the number of first bosses 11 and second bosses 21 is three, six installation cavities 4 are formed by the cooperation of adjacent first bosses 11 and second bosses 21, then the number of elastic blocks 32 is six, for example, the number of first bosses 11 and second bosses 21 is four, and the corresponding number of elastic blocks 32 is eight. The elastic band 31 is wound on the side wall of the first half-coupling 1 and is in interference fit with the side wall of the first half-coupling 1, and the elastic blocks 32 enter the installation cavities 4 and are in contact with the first bosses 11 in the circumferential direction of the first half-coupling 1, and are in contact with the second bosses 21 in the circumferential direction of the second half-coupling 2. Specifically, the length of the elastic band 31 is determined by the circumference of the first half-coupling 1. In different embodiments, the elastic band 31 and the elastic blocks 32 can be made of different materials, as long as they have sufficient elasticity and will not deform greatly when subjected to pressure, for example, the elastic band 31 and the elastic blocks 32 are made of rubber.

[0042] With reference to Figure 1 In order to prevent the elastic member 3 from being separated from the first half-coupling 1 during rotation, a limiting ring 5 is specifically but not limitatively provided, which is sleeved on the elastic belt 31 wound on the first half-coupling 1. The two side walls of the limiting ring 5 in the axial direction are respectively provided with a plurality of first limiting blocks 51 and a plurality of second limiting blocks 52. The first limiting blocks 51 are uniformly distributed along the circumferential direction of the limiting ring 5, and the second limiting blocks 52 are also uniformly distributed along the circumferential direction of the limiting ring 5. The first limiting blocks 51 and the second limiting blocks 52 respectively abut against the two side walls of the elastic belt 31 in the width direction. In this way, the first limiting blocks 51 and the second limiting blocks 52 can axially fixedly connect the limiting ring 5 to the elastic belt 31, preventing the limiting ring 5 from sliding along the axial direction of the first half-coupling 1 during rotation and being separated from the elastic belt 31. The limiting ring 5 is sleeved on the elastic belt 31, which can avoid the phenomenon that the elastic belt 31 is separated from the first half-coupling 1 during rotation.

[0043] With reference to Figure 1 and Figure 2, in order to facilitate the elastic band 31 in the radial direction of the first half coupling 1 dismounting, the face of the elastic band 31 away from the first boss 11 along the width direction of the elastic band 31 is provided with a plurality of first guide grooves 311 matched with the first limiting block 51, a plurality of first guide grooves 311 are uniformly arranged along the length direction of the elastic band 31, the second limiting block 52 is matched with the first guide groove 311, a plurality of clamping blocks 34 are outwardly protruded on the two side walls of the width direction of the elastic band 31, the clamping block 34 is located on the side wall of the first guide groove 311, and the clamping block 34 is made of rubber. The clamping block 34 can limit the rotation of the limiting ring 5 relative to the elastic band 31 when the first half coupling 1 rotates, avoid the limiting ring 5 rotating relative to the elastic band 31 in the rotating process of the first half coupling 1, make the first limiting block 51 or the second limiting block 52 rotate to the position aligned with the first guide groove 311, and thus the phenomenon that the first half coupling 1 slides relative to the elastic band 31 in the axial direction in the rotating process of the first half coupling 1 occurs. As an example, the first guide groove 311 is provided at the position corresponding to the position of the elastic block 32, the elastic block 32 is provided with eight, the first guide groove 311 is also provided with eight, and the clamping block 34 is provided with thirty-two. The limiting ring 5 is rotationally connected with the elastic band 31, and the second limiting block 52 is staggered with the first limiting block 51 along the circumference direction of the limiting ring 5. In this way, in the rotating process of the first half coupling 1, the first limiting block 51 and the second limiting block 52 are in abutment with the side wall of the width direction of the elastic band 31. When the elastic member 3 needs to be replaced, because the clamping block 34 is made of rubber and has elasticity, when the limiting ring 5 is forced, the limiting ring 5 can still be rotated to realize that the first limiting block 51 and the first guide groove 311 are aligned along the axis direction of the first half coupling 1 or the second limiting block 52 and the first guide groove 311 are aligned along the axis direction of the first half coupling 1, the limiting ring 5 can slide along the axis direction of the first half coupling 1 to realize disengagement with the elastic band 31, and the elastic band 31 can be dismounted in the radial direction of the first half coupling 1. When the replacement of the elastic member 3 is completed, only the first limiting block 51 or the second limiting block 52 needs to be aligned with the first guide groove 311, the limiting ring 5 needs to be slid along the axis direction of the first half coupling 1 to the position abutting with the elastic band 31, and then the limiting ring 5 is rotated to make the first limiting block 51 and the second limiting block 52 staggered with the first guide groove 311.

[0044] Referring to Figure 3 and Figure 4In order to relatively fix the limiting ring 5 and the elastic member 3, and also to conveniently separate the limiting ring 5 and the elastic member 3 when the elastic member 3 needs to be replaced, another embodiment of the limiting ring 5 is specifically but not limitatively provided, in which the plurality of first limiting blocks 51 and the plurality of second limiting blocks 52 arranged outward on the two side walls of the limiting ring 5 are cancelled, and a plurality of limiting members 53 are arranged on the inner wall of the limiting ring 5 in the circumferential direction. A plurality of positioning holes 313 adapted to the limiting members 53 are arranged on the surface of the elastic band 31 away from the first boss 11. The positioning holes 313 are arranged in the length direction of the elastic band 31. The limiting members 53 are inserted into the positioning holes 313. In different embodiments, the limiting members 53 can be in various forms, as long as they can cooperate with the positioning holes 313 to relatively fix the limiting ring 5 and the elastic member 3 in the axial direction of the first half-coupling 1. A plurality of limiting screw holes 531 adapted to the positioning holes 313 can be arranged on the limiting ring 5 in the circumferential direction, and a limiting screw 532 is arranged on the limiting screw hole 531 and is screwed into the positioning hole 313. A plurality of third limiting blocks 533 adapted to the positioning holes 313 can also be arranged on the inner wall of the limiting ring 5 in the circumferential direction, and the third limiting blocks 533 can be integrally formed with the limiting ring 5. Specifically, the positioning holes 313 are arranged at positions corresponding to the positions of the elastic protrusions 32. If there are eight elastic protrusions 32, there are also eight positioning holes 313, and eight limiting members 53. The limiting ring 5 and the elastic band 31 are relatively fixed by the cooperation of the limiting screw 532 and the positioning hole 313 or the cooperation of the third limiting block 533 and the positioning hole 313, so as to prevent the elastic band 31 from being separated from the first half-coupling 1 during rotation. A plurality of second guide grooves 312 are arranged on the surface of the elastic band 31 away from the first boss 11 in the width direction of the elastic band 31. The second guide grooves 312 are arranged in the length direction of the elastic band 31. The second guide grooves 312 are in communication with the positioning holes 313. The limiting screw 532 can be rotated into the second guide groove 312 and is in sliding connection with the second guide groove 312. The third limiting block 533 can also be rotated into the second guide groove 312 and is in sliding connection with the second guide groove 312. Specifically, the number of the second guide grooves 312 is equal to the number of the positioning holes 313. If there are eight positioning holes 313, there are also eight second guide grooves 312. When the elastic member 3 needs to be replaced, the limiting member 53 is rotated into the second guide groove 312, and the limiting ring 5 is slid in the axial direction of the first half-coupling 1, so as to separate the limiting ring 5 and the elastic band 31.

[0045] In another optional embodiment of the elastic member 3, referring to Figure 5The elastic member 3 comprises a plurality of elastic blocks 33. In different embodiments, the number of the elastic blocks 33 depends on the number of the first bosses 11 and the second bosses 21. When the number of the first bosses 11 and the second bosses 21 is three, six accommodation cavities 4 are formed by the adjacent first bosses 11 and the second bosses 21. Therefore, the number of the elastic blocks 33 is six. For example, when the number of the first bosses 11 is four, the number of the elastic blocks 33 is eight. The elastic blocks 33 are accommodated in the accommodation cavities 4 along the radial direction of the first half-coupling 1 and are in contact with the first bosses 11 along the circumferential direction of the first half-coupling 1 and in contact with the second bosses 21 along the circumferential direction of the second half-coupling 2. In different embodiments, the elastic blocks 33 can be made of different materials as long as they have enough elasticity and do not deform greatly when being pressed. For example, the elastic blocks 33 are made of rubber. The elastic blocks 33 are accommodated in the accommodation cavities 4 and can fix the first half-coupling 1 and the second half-coupling 2 along the circumferential direction of the first half-coupling 1, so that the first half-coupling 1 and the second half-coupling 2 rotate synchronously.

[0046] Referring to Figure 5 and Figure 6 Optionally, in order to prevent the elastic blocks 33 from being separated from the accommodation cavities 4 during rotation, a fixing ring 6 is provided. The fixing ring 6 is arranged on the first half-coupling 1 and is connected with the first half-coupling 1 and wraps the elastic member 3. In different embodiments, the fixing ring 6 can be connected with the first half-coupling 1 in different ways. For example, the first half-coupling 1 is a stepped cylinder, and a support 14 is formed at the joint of the end with a smaller diameter and the end with a larger diameter. One end of the fixing ring 6 is provided with a connecting ring surface matched with the support 14. The fixing ring 6 is coaxially arranged on the first half-coupling 1, the connecting ring surface is in contact with the support 14, and the fixing ring 6 is fixedly connected with the first half-coupling 1 by screws. The length of the fixing ring 6 extends from the support 14 to the bottom of the second matching groove 22, and the fixing ring 6 can wrap the elastic blocks 33 along the circumferential direction. The fixing ring 6 limits the movement of the elastic blocks 33 along the radial direction of the first half-coupling 1 and prevents the elastic member 3 from being separated from the accommodation cavities 4 during rotation. It is worth mentioning that the fixing ring 6 can also cooperate with the elastic belt 31 to limit the movement of the elastic belt 31 along the radial direction of the first half-coupling 1. When the elastic member 3 needs to be replaced, the screws are removed, the fixing ring 6 is slid along the axial direction of the first half-coupling 1, and the fixing ring 6 is separated from the elastic member 3.

[0047] It is worth mentioning that the first half coupling 1 and the equipment shaft can be connected in different ways, and the second half coupling 2 and the equipment shaft can also be connected in different ways. As an example, the first half coupling 1 is provided with a first equipment shaft through hole 13 coaxial with the first half coupling 1, and the second half coupling 2 is provided with a second equipment shaft through hole 23 coaxial with the second half coupling 2. The inner wall of the first equipment shaft through hole 13 is provided with a first key groove 7 along the axial direction of the first half coupling 1, the first key groove 7 extends to the end face of the first half coupling 1, the position of the first key groove 7 corresponds to the position of the first boss 11, the first half coupling 1 is relatively fixed with the equipment shaft in the circumferential direction through the first key groove 7, and the inner wall of the second equipment shaft through hole 23 is provided with a second key groove 8 along the axial direction of the second half coupling 2, the second key groove 8 extends to the end face of the second half coupling 2, the position of the second key groove 8 corresponds to the position of the second boss 21, and the second half coupling 2 is relatively fixed with the equipment shaft in the circumferential direction through the second key groove 8. In this way, the connecting part of the equipment shaft penetrates into the equipment shaft through hole and can be fixedly connected with the coupling in the circumferential direction. The length of the key groove is compensated by the length of the first boss 11 and the second boss 21 in the axial direction of the coupling, thereby reducing the matching length of the coupling and the equipment shaft, and further reducing the length of the coupling and the production cost of the product.

[0048] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A curved claw-type coupling, characterized in that: The coupling includes a first half-coupling (1), a second half-coupling (2), and an elastic element (3). Both the first half-coupling (1) and the second half-coupling (2) are cylindrical. The end face of one end of the first half-coupling (1) has multiple first bosses (11) protruding outward at equal intervals in the circumferential direction, and a first mating groove (12) is formed between adjacent first bosses (11). The end face of one end of the second half-coupling (2) has multiple second bosses (21) protruding outward at equal intervals in the circumferential direction, and a second mating groove (22) is formed between adjacent second bosses (21). The number of first bosses (11) is equal to the number of second bosses (21). The first half-coupling (1) and the second half-coupling (2) are connected. The first boss (11) is located in the second mating groove (22) and abuts against the bottom of the second mating groove (22). The second boss (21) is located in the first mating groove (12) and abuts against the bottom of the first mating groove (12). The adjacent first boss (11) and second boss (21) cooperate to form a mounting cavity (4). The elastic member (3) is detachably installed in the mounting cavity (4) along the radial direction of the first half coupling (1). The elastic member (3) is attached to the first boss (11) in the circumferential direction of the first half coupling (1) and attached to the second boss (21) in the circumferential direction of the second half coupling (2). The opening width of the first mating groove (12) is greater than the bottom width of the first mating groove (12), and the opening width of the second mating groove (22) is greater than the bottom width of the second mating groove (22). The elastic element (3) includes an elastic band (31) and a plurality of elastic protrusions (32). The elastic protrusions (32) are adapted to the mounting cavity (4). The plurality of elastic protrusions (32) are evenly distributed along the length direction of the elastic band (31). The elastic band (31) is wound around the side wall of the first half coupling (1) and is interference-fitted with the side wall of the first half coupling (1). The elastic protrusions (32) enter the mounting cavity (4) and are in contact with the first boss (11) in the circumferential direction of the first half coupling (1). At the same time, they are in contact with the second boss (21) in the circumferential direction of the second half coupling (2). The elastic band (31) is covered with a limiting ring (5). The limiting ring (5) is slidably connected to the first half coupling (1) along the axial direction of the first half coupling (1). The limiting ring (5) has multiple first limiting blocks (51) and multiple second limiting blocks (52) protruding outward on its two axial side walls respectively. The first limiting blocks (51) are evenly distributed along the circumference of the limiting ring (5), and the second limiting blocks (52) are evenly distributed along the circumference of the limiting ring (5). The first limiting blocks (51) and the second limiting blocks (52) abut against the two side walls of the elastic band (31) in the width direction respectively. The second limiting block (52) is staggered with the first limiting block (51) along the circumference of the limiting ring (5). The elastic band (31) away from the first boss (11) has a plurality of first guide grooves (311) adapted to the first limiting block (51) along the width direction of the elastic band (31). The plurality of first guide grooves (311) are evenly distributed along the length direction of the elastic band (31). The second limiting block (52) is adapted to the first guide groove (311). A plurality of snap-fit ​​blocks (34) protrude outward on the two side walls of the elastic band (31) in the width direction. The snap-fit ​​blocks (34) are located on both sides of the side wall of the first guide groove (311). The snap-fit ​​blocks (34) are made of elastic material.

2. The curved claw-type coupling according to claim 1, characterized in that: The inner wall of the limiting ring (5) is provided with a plurality of limiting members (53) evenly distributed around it. The elastic band (31) is provided with a plurality of positioning holes (313) that are adapted to the limiting members (53) on the surface away from the first boss (11). The positioning holes (313) are evenly distributed along the length of the elastic band (31), and the limiting members (53) are inserted into the positioning holes (313).

3. A curved claw-type coupling according to claim 2, characterized in that: The elastic band (31) has a plurality of second guide grooves (312) on the surface away from the first boss (11) along the width direction of the elastic band (31). The plurality of second guide grooves (312) are evenly distributed along the length direction of the elastic band (31). The second guide grooves (312) are connected to the positioning hole (313). The limiting member (53) rotates into the second guide groove (312) and slides in connection with the second guide groove (312).

4. A curved claw-type coupling according to claim 1, characterized in that: The elastic element (3) includes a plurality of elastic blocks (33), which are adapted to the mounting cavity (4). The elastic blocks (33) are installed in the mounting cavity (4) along the radial direction of the first half coupling (1) and are in contact with the first boss (11) in the circumferential direction of the first half coupling (1), while in contact with the second boss (21) in the circumferential direction of the second half coupling (2).

5. A curved claw-type coupling according to claim 1 or 3, characterized in that: It also includes a retaining ring (6), which is sleeved on the first half coupling (1) and connected to the first half coupling (1), and wraps around the elastic element (3).

6. A curved claw-type coupling according to claim 1, characterized in that: The first half-coupling (1) has a first equipment shaft through hole (13), which is coaxial with the first half-coupling (1). The second half-coupling (2) has a second equipment shaft through hole (23), which is coaxial with the second half-coupling (2). The inner wall of the first equipment shaft through hole (13) has a first keyway (7) along the axial direction of the first half-coupling (1). The first keyway (7) extends to the end face of the first half-coupling (1). The position of the first boss (11) corresponds to the position of the first keyway (7). The first keyway (7) is used to fix the first half coupling (1) and the equipment shaft in the circumferential direction. The inner wall of the second equipment shaft through hole (23) is provided with a second keyway (8) along the axial direction of the second half coupling (2). The second keyway (8) extends to the end face of the second half coupling (2). The position of the second keyway (8) corresponds to the position of the second boss (21). The second keyway (8) is used to fix the second half coupling (2) and the equipment shaft in the circumferential direction.

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