Pin type coupler with symmetrical rubber elastic bodies on two sides

Abstract

The invention relates to a pin coupling with rubber elastomers symmetrical on two sides, which comprises a flange group, the flange group comprises two flanges attached to each other, and the interiors of the two flanges are fixedly connected with corresponding rotating shafts through locking pieces respectively; the elastic reinforcing assembly comprises a sleeve cover, one flange is wrapped by the sleeve cover, the sleeve cover is fixedly connected with the other flange through a connecting piece, at least two sets of through holes located in the same axis are formed in the two flanges and the sleeve cover, and elastic assemblies are arranged in the through holes. The coupling is compact and reasonable in structure and convenient to operate, and the bearing capacity and the anti-seismic property of the coupling are improved by optimizing the structural design and adopting high-strength materials and a precision machining process; through the design and use of various locking pieces, the connection reliability and the anti-loosening effect are enhanced; through the design of the sleeve cover and the sealing ring, the structure of the coupler is optimized, and the connecting effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of couplings, and in particular to a pin - type coupling with symmetric rubber elastomers on both sides. Background Art

[0002] As a key component in a mechanical transmission system, the main function of a coupling is to connect two shafts and achieve effective transmission of motion and power. In various types of mechanical equipment, couplings are widely used. Especially in large - scale test facilities, such as the connection between a horizontal axial - flow pump and a motor, higher requirements are imposed on the performance of the coupling.

[0003] In a large - scale axial - flow pump system, due to the possible settlement of different foundations for the water pump and the motor, the axes of the two shafts connected by the coupling may have various offsets such as axial displacement, radial displacement, and angular displacement. Therefore, a coupling is needed that has a simple structure, good vibration - damping and buffering performance, and can compensate for the relative displacement of the two shafts at the same time. In addition, the coupling should also have the characteristics of no noise, no need for lubrication, and convenient installation, disassembly, and maintenance to meet the actual use requirements.

[0004] However, currently, standard elastic pin couplings usually have some problems. On the one hand, traditional elastic pin couplings mostly adopt the installation method of one - side pins and one - side rubber elastomers. This structure results in a relatively low load - bearing capacity of the coupling, and only one side has the elastic connection function, making it difficult to fully meet the usage requirements under heavy loads and complex working conditions. On the other hand, some couplings suitable for heavy loads often have complex structures and large radial dimensions, which not only increase the manufacturing cost but also limit their application in limited spaces.

[0005] Therefore, there is an urgent need for a new type of coupling that can solve the problems of low load - bearing capacity and single elastic connection of traditional elastic pin couplings, and can avoid the defects of complex structure and large radial dimensions to meet the special requirements for the connection between a horizontal axial - flow pump and a motor in large - scale test facilities. Summary of the Invention

[0006] The applicant of the present invention aims at the above - mentioned disadvantages in the existing production technology and provides a pin - type coupling with symmetric rubber elastomers on both sides. By optimizing the structural design, using high - strength materials and precision machining processes, the load - bearing capacity and seismic performance of the coupling are improved; through the design and use of various locking parts, the connection reliability and anti - loosening effect are enhanced; through the design of the sleeve cover and the sealing ring, the structure of the coupling is optimized and the connection effect is improved.

[0007] The technical solution adopted by the present invention is as follows:

[0008] A pin - type coupling with symmetric rubber elastomers on both sides, comprising:

[0009] Flange group, which includes two flanges that fit together, and the two flanges are respectively fixedly connected to the corresponding rotating shafts through locking members;

[0010] Elastic reinforcement assembly, which includes a sleeve cover. The sleeve cover covers one of the flanges and is fixedly connected to the other flange through a connecting member. At least two groups of through holes on the same axis are provided on the two flanges and the sleeve cover, and an elastic assembly is arranged in the through holes;

[0011] The elastic assembly includes a stud sleeve. The middle part of the stud is located in the covered flange, and both ends of the stud extend to both sides and are sleeved with elastic sleeves. Covers and bolts for axially limiting the elastic sleeves are arranged on the other flange and the sleeve cover.

[0012] In one embodiment, a connection hole for docking with the rotating shaft is provided on the flange, a cover plate is arranged in the connection hole, and a plurality of annularly distributed first locking members are arranged on the area where the cover plate contacts the shaft end of the rotating shaft.

[0013] In one embodiment, at least two through holes are further provided on the cover plate. A second locking member is inserted into the through holes. Prefabricated grooves corresponding to the second locking member are provided on the flange and the rotating shaft. The second locking member includes a first stud lobe and a second stud lobe with semicircular cross-sections. The first stud lobe and the second stud lobe are respectively located in the corresponding prefabricated grooves on the flange and the rotating shaft, and the two stud lobes are buckled together to form a whole. A limiting block is fixedly connected to the stud lobe close to the rotating shaft, and the limiting block is clamped on the outer extension of the cover plate.

[0014] In one embodiment, the stud lobe close to the flange is of an L-shaped structure, and the end face height D1 of the stud lobe on the rotating shaft on the side close to the limiting block is less than the end face height D2 on the other side.

[0015] In one embodiment, the middle part of the stud has a larger diameter, and the diameters on both sides are smaller. A stud sleeve is sleeved on the middle part of the stud.

[0016] In one embodiment, the horizontal section of the sleeve cover covers the middle flange, and the horizontal section of the sleeve cover extends to a preset annular groove on the other flange. At least two connecting members are arranged between the sleeve cover and the outer flange.

[0017] In one embodiment, the elastic ring is made of rubber material, and there is a gap between the elastic ring and the flange or the sleeve cover.

[0018] In one embodiment, a sealing ring is arranged between the two flanges.

[0019] The beneficial effects of the present invention are as follows:

[0020] The structure of the present invention is compact and reasonable, and it is convenient to operate. By optimizing the structural design, adopting high-strength materials and precision machining processes, the bearing capacity and seismic performance of the coupling are improved; through the design and use of various locking parts, the connection reliability and anti-loosening effect are enhanced; through the design of the sleeve cover and the sealing ring, the structure of the coupling is optimized and the connection effect is improved. These beneficial effects together make the coupling in this embodiment perform excellently in the connection between the horizontal axial flow pump shaft and the motor in large test facilities, and it can withstand heavy loads, compensate for the relative displacement of the two shafts, have good vibration damping and buffering performance, no noise, do not require lubrication, and is convenient for installation, disassembly and maintenance, meeting the actual use requirements.

[0021] At the same time, the present invention also has the following advantages:

[0022] The coupling in this embodiment adopts a rubber elastomer design with bilateral symmetry. Through 20 elastic components evenly distributed on the flange and the sleeve cover, the elastic acting force is maximally improved. This design not only makes the elastomer more evenly squeezed, increasing the service life and bearing capacity, but also effectively improves the seismic performance of the coupling. During the torque transmission process, the rubber elastomer can absorb and buffer vibrations and impacts, reducing rigid impacts and vibration noises, thereby improving the stability and reliability of the coupling. Specifically, the middle diameter of the pin is larger, which can withstand larger torque transmission, while the diameters on both sides are smaller, facilitating the sleeving of the elastic sleeve and the cooperation with the flange and the sleeve cover. The design of the pin sleeve further enhances the strength and stiffness of the pin, improving its bending and torsional resistance. As a key component of the coupling, the elastic ring is made of rubber material with good elasticity and damping performance, providing a stable elastic acting force for the coupling.

[0023] The coupling in this embodiment adopts a variety of locking parts to ensure a firm connection between the flange and the rotating shaft. The first locking part usually uses high-strength bolts. By tightening the nuts to generate a pre-tightening force, the flange is fastened to the rotating shaft. The second locking part, as an auxiliary locking device, has been carefully designed in terms of its structure and function, including a first pin lobe and a second pin lobe with semi-circular cross-sections. The two pin lobes are buckled together to form a whole, and by inserting through the through-hole and engaging in the prefabricated grooves on the flange and the rotating shaft, further locking between the flange and the rotating shaft is achieved. This design not only improves the connection reliability but also makes the installation and disassembly of the coupling more convenient and fast. At the same time, the design of the limit block plays a positioning role, ensuring the accurate position and stability of the second locking part during the installation process, and having a more reliable anti-loosening effect than ordinary safety pins.

[0024] The coupling structure in this embodiment is compact. The design of the sleeve cover fully considers the overall structural strength and stability of the coupling. The sleeve cover is made by casting or forging processes, and the material is high-strength cast iron or alloy steel, which has good rigidity and impact resistance. The horizontal section of the sleeve cover wraps the flange in the middle, not only enhancing the overall structural strength of the flange group but also improving the connection effect of the coupling. It is fixedly connected to the outer flange through connecting parts, forming a stable overall structure, restricting the radial displacement degree between the two flanges, and improving the stability and precision of the coupling. At the same time, a sealing ring is arranged between the two flanges, which can effectively prevent leakage problems caused by factors such as vibration, impact, or temperature change during the operation of the coupling, further improving the connection effect of the coupling. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the present invention.

[0026] Figure 2 is Figure 1 a sectional view taken along line A-A in

[0027] Figure 3 is Figure 2 a partially enlarged view of part B in

[0028] Figure 4 is Figure 2 an axial exploded view of

[0029] Figure 5 is a schematic structural diagram of the second locking member of the present invention.

[0030] Wherein:

[0031] 100, the first rotating shaft; 200, the second rotating shaft; 300, the first flange; 400, the second flange; 500, the elastic reinforcement assembly; 600, the first locking member; 700, the second locking member;

[0032] 501, the connecting part; 502, the stud; 5021, the stud sleeve; 503, the elastic sleeve; 504, the connecting bolt; 505, the cover plate;

[0033] 701, the first stud lobe; 702, the second stud lobe; 703, the limiting block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The following will describe the detailed embodiments of the present invention with reference to the accompanying drawings.

[0035] As shown in Figures 1-5As shown, this embodiment discloses a pin - type coupling with rubber elastomers symmetric on both sides, including a flange group and an elastic reinforcement component. The flange group includes two flanges that are mutually attached, namely the first flange 300 and the second flange 400. The first flange 300 fixes the first rotating shaft 100 (which is also the motor shaft) through the first locking member 600 and the second locking member 700. The second flange 400 fixes the second rotating shaft 200 (which is also the axial - flow pump shaft) through the first locking member 600 and the second locking member 700. Specifically, the designs of the first flange 300 and the second flange 400 adopt high - precision machining processes to ensure the flatness and sealing performance of their mating surfaces. The material of the flanges is selected as high - strength alloy steel, which has good tensile and compressive resistance properties and can withstand the huge stresses generated during the torque transmission of the coupling. The combined use of the first locking member 600 and the second locking member 700 realizes the firm connection between the flange and the rotating shaft. The first locking member 600 usually adopts high - strength bolts, whose threaded parts are closely matched with the threaded holes on the flange. By tightening the nuts to generate pre - tightening force, the flange is fastened to the rotating shaft.

[0036] The elastic reinforcement component 500 includes a sleeve cover. The sleeve cover covers one of the flanges. In this embodiment, the sleeve cover is sleeved on the first flange 300 and covers the entire first flange 300. At the same time, the sleeve cover is fixedly connected to the second flange 400 through the connecting member 501. And there are at least two groups of through - holes on the two flanges and the sleeve cover that are on the same axis, and elastic components are arranged in the through - holes. In this embodiment, the number of elastic components is 20, which maximizes the elastic acting force. The design of the sleeve cover fully considers the overall structural strength and stability of the coupling. The sleeve cover is made by casting or forging processes, and the material is high - strength cast iron or alloy steel, which has good rigidity and impact resistance. The inner wall of the sleeve cover is closely attached to the outer wall of the first flange 300 and is fixedly connected to the second flange 400 through the connecting member 501, forming a stable overall structure. The design of the through - holes enables the elastic components to be evenly distributed on the flanges and the sleeve cover, thereby improving the elastic acting force and seismic performance of the coupling. The number of elastic components is reasonably selected according to the torque transmission size and working environmental conditions of the coupling. In this embodiment, 20 elastic components are selected, which not only ensures sufficient elastic acting force but also avoids the structural complexity and cost increase caused by too many elastic components. At the same time, the arrangement method of the elastic components has also been optimized to ensure that during the torque transmission process, the forces on each elastic component are evenly distributed, improving the overall service life of the coupling.

[0037] Specifically, as Figure 3As shown in the figure, in this embodiment, the elastic component includes a dowel bushing 5021 and a dowel pin 502. The middle part of the dowel pin 502 is located in the covered flange, and both ends of the dowel pin 502 extend to both sides and are sleeved with elastic sleeves 503. A cover plate 505 and a connecting bolt 504 for axially limiting the elastic sleeve 503 are provided on the other flange and the cover. The material of the dowel pin 502 is usually selected from high-strength alloy steel or stainless steel, which has good tensile, compressive and bending resistance. The middle part of the dowel pin 502 has a larger diameter, which can withstand greater torque transmission. At the same time, the diameters of both sides are smaller, which is convenient for sleeving the elastic sleeve 503 and for mating with the flange and the cover. The elastic sleeve 503 is made of high-quality rubber or polyurethane material, which has good elasticity and wear resistance, and can provide a stable elastic force during the operation of the coupling, absorbing and buffering the vibration and impact during the torque transmission process. The design of the cover plate 505 and the connecting bolt 504 ensures the axial limitation of the elastic sleeve 503, preventing it from axially moving during the operation and affecting the normal operation of the coupling. At the same time, the materials and specifications of the cover plate 505 and the connecting bolt 504 have also been strictly selected and calculated to ensure that they can withstand the huge stress and vibration during the operation of the coupling.

[0038] In this embodiment, the middle part of the dowel pin 502 has a larger diameter, and the diameters of both sides are smaller. The middle part of the dowel pin 502 is sleeved with a dowel bushing 5021. The elastic ring is made of rubber material, providing an elastic force. There is a gap between the elastic ring and the flange or the cover, so that there is a certain vibration space between the two flanges in the radial direction. At the same time, it is restricted by the dowel pin 502, thus achieving a certain seismic resistance effect. The design of the larger middle diameter of the dowel pin 502 not only improves the bearing capacity of the dowel pin 502, but also makes the dowel pin 502 more stable and reliable during the torque transmission process. The design of the smaller diameters on both sides is convenient for sleeving and installing the elastic sleeve 503, and at the same time reduces the overall weight of the coupling. The design of the dowel bushing 5021 further enhances the strength and stiffness of the dowel pin 502, improving its bending and torsional resistance. As one of the key components of the coupling, the material and performance of the elastic ring have a direct impact on the seismic resistance effect of the coupling. The rubber material has good elasticity and damping performance, and can effectively absorb and buffer vibration and impact during the operation of the coupling, improving the seismic performance of the coupling. The gap design between the elastic ring and the flange or the cover enables there to be a certain vibration space between the two flanges in the radial direction, thus reducing the rigid impact and vibration noise during the torque transmission process of the coupling. At the same time, the restrictive effect of the dowel pin 502 ensures the stability and reliability of the coupling in the radial direction.

[0039] As Figure 2 and Figure 3As shown, the horizontal section of the sleeve cover in this embodiment covers the flange located in the middle, and the horizontal section of the sleeve cover extends to the preset annular groove on the other flange. At least two connectors 501 are arranged between the sleeve cover and the outer flange, which improves the connection effect between the flange group and the sleeve cover, and also limits the radial displacement between the two flanges. The horizontal section design of the sleeve cover fully considers the overall structure and installation requirements of the coupling. The horizontal section covers the flange located in the middle, which not only enhances the overall structural strength of the flange group, but also improves the connection effect of the coupling. The horizontal section of the sleeve cover extends to the preset annular groove on the other flange, and is fixedly connected to the outer flange through the connector 501 to form a stable overall structure. The number and position of the connector 501 have been optimized, which not only ensures the connection reliability between the flange group and the sleeve cover, but also limits the radial displacement between the two flanges, and improves the stability and precision of the coupling. In practical applications, according to the specific use requirements and working environment conditions of the coupling, connectors 501 of different specifications and models can be selected to meet the installation and use requirements of the coupling.

[0040] like Figure 2 As shown, the flange in this embodiment is provided with a connection hole for docking with the rotating shaft, and a cover plate 505 is arranged in the connection hole, and a plurality of first locking members 600 distributed in an annular manner are arranged in the area where the cover plate 505 contacts the shaft end of the rotating shaft, thereby improving the connection effect between the flange and the rotating shaft. The connection hole provided on the flange is reasonably designed, and is closely matched with the shaft end of the rotating shaft, thereby ensuring the transmission torque efficiency and stability of the coupling. The design of the cover plate 505 further enhances the connection reliability between the flange and the rotating shaft. The cover plate 505 is made of high-strength material and has good rigidity and impact resistance. A plurality of first locking members 600 distributed in an annular manner are arranged in the area where the cover plate 505 contacts the shaft end of the rotating shaft, and a pre-tightening force is generated by tightening the first locking members 600, so that the cover plate 505 is fastened to the rotating shaft, thereby realizing a firm connection between the flange and the rotating shaft. The number and position of the first locking members 600 are optimized, which not only ensures the connection reliability between the flange and the rotating shaft, but also avoids the structural complexity and cost increase caused by too many locking members. At the same time, the material and specifications of the first locking member 600 have also been strictly selected and calculated to ensure that it can withstand the huge stress and vibration of the coupling during operation.

[0041] like Figure 2As shown in the figure, at least two through holes are also provided on the cover plate 505 in this embodiment. A second locking member 700 is inserted into the through holes, and prefabricated grooves corresponding to the second locking member 700 are provided on the flange and the rotating shaft. The second locking member 700 includes a first pin lobe 701 and a second pin lobe 702, both of which have a semicircular cross-section. The first pin lobe 701 and the second pin lobe 702 are respectively located in the prefabricated grooves on the flange and the rotating shaft, and the two pin lobes are buckled together to form an integral body. A limiting block 703 is also fixedly connected to the pin lobe close to the rotating shaft. The limiting block 703 is engaged with the outer extension of the cover plate 505 to play a positioning role. The through holes provided on the cover plate 505 facilitate the installation of the second locking member 700. The second locking member 700, as an auxiliary locking device between the flange and the rotating shaft, has been carefully designed in terms of its structure and function. The second locking member 700 includes a first pin lobe 701 and a second pin lobe 702, both of which have a semicircular cross-section. The two pin lobes are buckled together to form an integral body. By inserting into the through holes and engaging with the prefabricated grooves on the flange and the rotating shaft, further locking between the flange and the rotating shaft is achieved. This design not only improves the connection reliability between the flange and the rotating shaft but also makes the installation and disassembly of the coupling more convenient and fast. The design of the limiting block 703 plays a positioning role, ensuring the accurate position and stability of the second locking member 700 during the installation process. At the same time, the material and specifications of the limiting block 703 have also been strictly selected and calculated to ensure that it can withstand the huge stress and vibration of the coupling during operation.

[0042] As Figure 3 shown, the pin lobe close to the flange in this embodiment has an L-shaped structure. The end face height D1 of the second pin lobe 702 on the side close to the limiting block 703 is less than the end face height D2 on the other side. When the two pin lobes approach each other axially, a radial force will be provided, thereby tightening the flange and the rotating shaft. At the same time, after reaching the position, there will be no axial movement. The pin lobe close to the flange 300 has an L-shaped structure and is combined with the other pin lobe (note: here it generally refers to the cooperation between two pin lobes) to form an integral cylinder, and axial limit can be achieved. The design that the end face height D1 of the pin lobe on the rotating shaft on the side close to the limiting block 703 is less than the end face height D2 on the other side cleverly utilizes the geometric change of the pin lobe during the axial movement to generate a radial force, making the flange and the rotating shaft fit more closely together during the locking process. This design not only improves the connection reliability between the flange and the rotating shaft but also enhances the seismic performance and stability of the coupling. At the same time, when the two pin lobes approach each other axially and reach the predetermined position, due to the action of the limiting block 703 and the tight fit between the pin lobes, they will no longer have axial movement, thus ensuring the stability and accuracy of the coupling during operation.

[0043] A sealing ring is provided between the two flanges in this embodiment. The design of the sealing ring is an important guarantee for the connection effect of the coupling. By setting a sealing ring between the two flanges, it can effectively prevent leakage problems of the coupling caused by factors such as vibration, impact, or temperature change during operation. The material of the sealing ring is usually selected as high-performance rubber or polyurethane materials that are oil-resistant, high-temperature-resistant, and wear-resistant, and have good elasticity and connection effect. During the installation process, the sealing ring is tightly compressed between the two flanges, forming a reliable sealing effect.

[0044] The assembly method in this embodiment is as follows: The first flange 300 is connected to the motor shaft through the second locking member 700 and the first locking member 600, and the second flange 400 is connected to the water pump shaft through the second locking member 700 and the first locking member 600. The first flange 300 is connected to the left and right rubber elastic rings (the number is not clearly defined in the original text, assumed to be part of the elastic sleeve 503 or a similar component) through the dowel pins 502. At the same time, the dowel pins 502 and the elastic rings are placed inside the second flange 400 and the cover plate 505, and then the first flange 300, the second flange 400, and the cover plate 505 are tightened with nuts and the cover plate 505. At the same time, the holes around the outer circle of the elastic reinforcement component 500 are fixedly connected to the holes around the outer circle of the second flange 400 through screws. In the present invention, after the elastic reinforcement component 500 is fixed to the second flange 400, rubber elastic bodies (the number is not clearly defined in the original text, can be understood as the elastic sleeve 503 or a similar component) are installed on both sides of the first flange 300 respectively. The elastic bodies are more evenly compressed, increasing the service life and load-bearing capacity. Here, using the second locking member 700 is more reliable than the ordinary safety pin and has an anti-loosening effect. At the same time, the motor torque in this embodiment is 1000000 N / M. The coupling in this embodiment has a compact structure and can transmit a larger torque in the same space. It is simple, noiseless, does not require lubrication, and is convenient for installation, disassembly, and maintenance. In summary, in the present invention, after the elastic reinforcement component 500 is fixed to the second flange 400, rubber elastic bodies (the number is not clearly defined in the original text, can be understood as the elastic sleeve 503 or a similar component) are installed on both sides of the first flange 300 respectively. The elastic bodies are more evenly compressed, increasing the service life and load-bearing capacity. At the same time, using the second locking member 700 is more reliable than the ordinary safety pin and has an anti-loosening effect.

[0045] The above description is an explanation of the present invention, not a limitation of the invention. The scope defined by the present invention can be seen in the claims. Any form of modification can be made within the protection scope of the present invention.

Claims

1. A pin-type coupling having a bilaterally symmetrical rubber elastic body, characterized in that: include: A flange assembly, comprising two flanges fitted to each other, wherein the two flanges are fixedly connected to corresponding rotating shafts via locking members; An elastic reinforcement component, comprising a cover, the cover covers one of the flanges and is fixedly connected to the other flange via a connecting piece, and at least two groups of through holes on the same axis are formed on the two flanges and the cover, and an elastic component is arranged in the through hole; The elastic component includes a pin sleeve, the middle part of the pin is located in the covered flange, and the two ends of the pin extend to both sides and are covered with elastic sleeves, and the other flange and the sleeve cover are provided with a cover plate and bolts for axially limiting the elastic sleeve.

2. A pin-type coupling having a bilaterally symmetrical rubber elastic body as claimed in claim 1, characterized in that: The flange is provided with a connection hole for docking with the rotating shaft, a cover plate is arranged in the connection hole, and a plurality of first locking members distributed in an annular manner are arranged in the area where the cover plate contacts the shaft end of the rotating shaft.

3. A pin-type coupling having a bilaterally symmetrical rubber elastic body as claimed in claim 2, characterized in that: The cover plate is also provided with at least two through holes, in which a second locking piece is inserted, and prefabricated grooves corresponding to the second locking piece are provided on the flange and the rotating shaft. The second locking piece includes a first column pin petal and a second column pin petal, both of which have semicircular cross-sections. The first column pin petal and the second column pin petal are respectively located in the corresponding prefabricated grooves on the flange and the rotating shaft, and the two column pin petals are interlocked and formed as a whole. A limiting block is also fixedly connected to the column pin petal close to the rotating shaft, and the limiting block is clamped on the extension of the cover plate.

4. A pin-type coupling having a bilaterally symmetrical rubber elastic body as claimed in claim 3, characterized in that: The pin petal close to the flange is an L-shaped structure, and the end surface height D1 of the pin petal on the rotating shaft close to the limit block is smaller than the end surface height D2 of the other side.

5. A pin-type coupling having a bilaterally symmetrical rubber elastic body as claimed in claim 1, characterized in that: The central part of the pin has a larger diameter, and the diameters on both sides are smaller. The central part of the pin is sleeved with a pin sleeve.

6. A pin-type coupling having a bilaterally symmetrical rubber elastic body as claimed in claim 1, characterized in that: The horizontal section of the sleeve covers the flange in the middle, and extends to a preset annular groove on another flange. At least two connecting pieces are arranged between the sleeve and the outer flange.

7. A pin-type coupling having a bilaterally symmetrical rubber elastic body as claimed in claim 1, characterized in that: The elastic ring is made of rubber material, and a gap is provided between the elastic ring and the flange or the sleeve cover.

8. A pin-type coupling having a bilaterally symmetrical rubber elastic body as claimed in claim 1, characterized in that: A sealing ring is arranged between the two flanges.

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