Flexible joint coupling

Abstract

The application provides a flexible joint coupling, which comprises a first coupling joint, a second coupling joint, a connecting piece, an elastic sleeve, a limiting part and a positioning part; the first coupling joint is provided with a first through hole, the first through hole comprises a first hole section with an opening formed on a first surface and a second hole section with an opening formed on a second surface, and the second coupling joint is provided with a second through hole; the connecting piece comprises a first mounting section, a connecting section, a second mounting section and a positioning section arranged in sequence; the elastic sleeve is sleeved on the second mounting section, and an outer wall can abut on an inner wall of the second through hole; the positioning part is arranged on the positioning end, and the limiting part is arranged between the first mounting section and the inner wall of the first hole section. The flexible joint coupling not only has strong compensation capacity, but also can reduce the risk of tensile damage of elements when a large torque is borne, thereby reducing maintenance cost.

Description

Technical Field

[0001] The present invention relates to the technical field of couplings, in particular to a flexible joint coupling. Background Art

[0002] Couplings are commonly used connecting mechanisms in mechanical transmission, used to connect two shafts so that they rotate together. Their performance in all aspects plays an important role in the safe and stable operation of mechanical equipment.

[0003] Most existing couplings include a first coupling, a second coupling, a connector, and an elastic component. The first coupling is provided with a first connecting hole, and the second coupling is provided with a second connecting hole. During assembly, one end of the connector is inserted into the first connecting hole, and the other end is connected to the second connecting hole via the elastic component. This technical solution relies solely on the elastic component, which connects the connector to the second connecting hole, to compensate for relative displacement between the first and second couplings. This has the disadvantage of weak compensation capability, and the elastic element is prone to tensile failure when subjected to high torque, which in turn increases maintenance costs. Summary of the Invention

[0004] The object of the present invention is to provide a flexible joint coupling which not only has a strong compensation capability but also can reduce the risk of tensile failure of components when subjected to large torques, thereby reducing maintenance costs.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A flexible joint coupling comprises: a first coupling, a second coupling, a connecting piece, an elastic sleeve, a limiting component and a positioning component;

[0007] The first coupling has a first surface and a second surface facing each other, a first through hole penetrating the first and second surfaces is provided on the first coupling, the first through hole including a first hole section forming an opening on the first surface and a second hole section forming an opening on the second surface, and a second through hole is provided on the second coupling, the second coupling facing the second surface, and the axis of the second through hole coincides with the axis of the first through hole;

[0008] The connecting member includes a first mounting section, a connecting section, a second mounting section, and a positioning section arranged in sequence, wherein the first mounting section is located within the first hole section, the connecting section is inserted into the second hole section, the second mounting section extends into the second through hole, and the positioning section extends from a side of the second through hole away from the first coupling;

[0009] The elastic sleeve is sleeved on the second mounting section, and the outer wall can abut against the inner wall of the second through hole. The positioning component is arranged on the positioning section to fix the elastic sleeve within the second through hole. The limiting component is arranged between the first mounting section and the inner wall of the first hole section to limit the relative position between the first mounting section and the inner wall of the first hole section.

[0010] Preferably, it also includes an inner cylinder made of a rigid material;

[0011] The inner cylinder is sleeved on the second mounting section, and the elastic sleeve is sleeved on the inner cylinder and fixedly connected to the inner cylinder.

[0012] Preferably, an external thread is provided on the surface of the positioning section, and the positioning component is a nut matching the external thread, so that the positioning component is threadedly connected to the positioning section and abuts against the end surface of the inner cylinder by screwing in.

[0013] Preferably, it also includes an outer cylinder made of a rigid material;

[0014] The outer cylinder is sleeved on the elastic sleeve and fixedly connected to the elastic sleeve, so that the elastic sleeve can abut against the inner wall of the second through hole through the outer cylinder.

[0015] Preferably, the elastic sleeve includes N buffer segments, and the N buffer segments are arranged in sequence along the circumference of the second through hole. When the elastic sleeve is in a free state, two adjacent buffer segments are separated from each other.

[0016] The outer cylinder includes N cylinder tiles, which are arranged in sequence along the circumference of the second through hole, and the N cylinder tiles are connected to the N buffer sections in a one-to-one correspondence.

[0017] Preferably, the buffer segment has an abutting end surface facing the adjacent buffer segment, and when the elastic sleeve is subjected to radial pressure, the buffer segment can be deformed so that the two abutting end surfaces of the two adjacent buffer segments fit together;

[0018] A vibration-damping groove is provided on the abutting end surface. When the two abutting end surfaces of two adjacent buffer segments are fitted together, the two vibration-damping grooves on the two abutting end surfaces jointly form a vibration-damping space.

[0019] Preferably, in a cross section passing through the axis of the elastic sleeve, the elastic sleeve is in a shape that tapers from the inner wall toward the outer wall.

[0020] Preferably, a first vibration-damping hole having an axis parallel to the axis of the elastic sleeve is provided in the side wall of the elastic sleeve;

[0021] The number of the first vibration-damping holes is at least two, and on a cross section perpendicular to the axis of the elastic sleeve, the line connecting the points formed by the axes of at least two of the first vibration-damping holes is a straight line L1, and the point formed by the axis of the elastic sleeve is located on the straight line L1.

[0022] Preferably, a second vibration-damping hole having an axis parallel to the axis of the elastic sleeve is provided in the side wall of the elastic sleeve;

[0023] The number of the second vibration-damping holes is at least two, and on a cross section perpendicular to the axis of the elastic sleeve, a line connecting points formed by the axes of at least two of the second vibration-damping holes is a straight line L2, the points formed by the axis of the elastic sleeve are located on the straight line L2, and the straight line L1 is perpendicular to the straight line L2;

[0024] In the radial direction of the elastic sleeve, the maximum distance between the inner walls of the first vibration-damping holes is A, the maximum distance between the inner walls of the second vibration-damping holes is B, and A>B.

[0025] Preferably, the limiting component is a cylindrical body having an accommodating through hole, and the outer shape matches the shape of the first hole segment, and the first mounting segment is located within the accommodating through hole.

[0026] Preferably, the limiting component is made of a rigid material and is fixedly connected to the inner wall of the first hole segment, and the first mounting segment can rotate relative to the limiting component in the accommodating through hole.

[0027] Preferably, the shape of the first mounting section is spherical, and the shape of the accommodating through hole matches the shape of the first mounting section.

[0028] Preferably, the limiting component is made of elastic material, and its outer wall abuts against the inner wall of the first hole segment, and the outer wall of the first mounting segment abuts against the inner wall of the accommodating through hole.

[0029] Preferably, the limiting component is made of a flexible material, an annular air-filled space extending axially is provided in the side wall of the limiting component, and an air inlet for allowing external fluid to enter the air-filled space is provided on the outer surface of the limiting component;

[0030] When external fluid enters the inflation space, the limiting component can be deformed, so that the outer wall of the limiting component fits with the inner wall of the first hole segment, and the inner wall of the accommodating through hole fits with the outer wall of the first installation segment.

[0031] The flexible joint coupling of the present invention adopts the elastic sleeve to be sleeved on the second mounting section, and the outer wall can abut against the inner wall of the second through hole. The positioning component is arranged on the positioning section to fix the elastic sleeve within the second through hole. The limiting component is arranged between the first mounting section and the inner wall of the first hole section to limit the relative position between the first mounting section and the inner wall of the first hole section. The technical solution not only has a strong compensation ability, but also can reduce the risk of tensile damage of the component when subjected to a large torque, thereby reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the structure of the flexible joint coupling in Example 1;

[0033] Figure 2 is a cross-sectional schematic diagram of the elastic sleeve in the third embodiment in a free state;

[0034] Figure 3 This is a schematic cross-sectional view of the elastic sleeve in Example 3 when subjected to radial force;

[0035] Figure 4 is a schematic cross-sectional view of the elastic sleeve in the fourth embodiment;

[0036] Figure 5 is a cross-sectional view of the limiting component in Example 5;

[0037] Figure 6 This is a cross-sectional view of the limiting component in Example 6.

[0038] In the figure: 1-first coupling; 2-second coupling; 3-connecting piece; 4-elastic sleeve; 5-limiting component; 6-positioning component; 7-first surface; 8-second surface; 9-first through hole; 10-first hole section; 11-second hole section; 12-second through hole; 13-first mounting section; 14-connecting section; 15-second mounting section; 16-positioning section; 17-inner cylinder; 18-outer cylinder; 19-buffer section; 20-cylinder tile; 21-abutting end face; 22-vibration-damping groove; 23-vibration-damping space; 24-first vibration-damping hole; 25-second vibration-damping hole; 26-accommodating through hole; 27-inflating space; 28-air inlet; 29-blocking component. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the flexible joint coupling of the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0040] Example 1

[0041] A flexible joint coupling is used to connect an external first rotating shaft (not shown) and a second rotating shaft (not shown) so that the two can rotate together.

[0042] The specific structure of the flexible joint coupling is as follows Figure 1 As shown, it includes: a first coupling 1, a second coupling 2, a connecting member 3, an elastic sleeve 4, a limiting component 5 and a positioning component 6. In actual use, the first coupling 1 can be fixedly connected to the first rotating shaft, and the second coupling 2 can be fixedly connected to the second rotating shaft.

[0043] The first coupling 1 has a first surface 7 and a second surface 8 facing each other. A first through hole 9 is provided on the first coupling 1, extending through the first and second surfaces 7 and 8. The first through hole 9 includes a first hole segment 10, which forms an opening on the first surface 7, and a second hole segment 11, which forms an opening on the second surface 8. In actual production, the diameter of the first hole segment 10 is larger than the diameter of the second hole segment 11, and the axes of the first and second hole segments coincide. A second through hole 12 is provided on the second coupling 2, facing the second surface 8, and the axis of the second through hole 12 coincides with the axis of the first through hole 9.

[0044] Connector 3 includes a first mounting segment 13, a connecting segment 14, a second mounting segment 15, and a positioning segment 16, arranged in sequence. First mounting segment 13 is located within first hole segment 10, connecting segment 14 is inserted into second hole segment 11, second mounting segment 15 extends into second through-hole 12, and positioning segment 16 extends from the side of second through-hole 12 away from first coupling 1. In actual production, the outer profile of first mounting segment 13 can be a rotating body (e.g., a cylinder, a sphere, etc.), and the diameter of first mounting segment 13 is smaller than that of first hole segment 10 and larger than that of second hole segment 11. This prevents first mounting segment 13 from escaping from first hole segment 10 through second hole segment 11.

[0045] The elastic sleeve 4 is sleeved on the second mounting section 15, and its outer wall is able to abut the inner wall of the second through hole 12, that is, the elastic sleeve 4 is located within the second through hole 12. A positioning member 6 is provided on the positioning section to fix the elastic sleeve 4 within the second through hole 12. A limiting member 5 is provided between the first mounting section 13 and the inner wall of the first hole section 10 to limit the relative position between the first mounting section 13 and the inner wall of the first hole section 10.

[0046] By adopting such a technical solution, the elastic sleeve 4 and the limiting component 5 can jointly supplement the displacement generated between the first coupling 1 and the second coupling 2, so that the compensation capability is enhanced. At the same time, the position of the first mounting segment 13 is limited by the limiting component 5, which can avoid the flexible joint coupling from being subjected to a large torque, causing the second mounting segment 15 to generate a large displacement in the second through hole 12 (i.e., the relative displacement between the second mounting segment 15 and the inner wall of the second through hole 12) and damaging the elastic sleeve 4, thereby reducing maintenance costs.

[0047] Specifically, if Figure 1 As shown in the figure, in a cross section passing through the axis of the elastic sleeve 4, the elastic sleeve 4 tapers from the inner wall toward the outer wall. This technical solution increases the elastic sleeve 4's stretching threshold, preventing excessive axial compensation displacement from causing cracking at the end of the elastic sleeve 4. When subjected to radial loads, the elastic sleeve 4's outer wall aligns with the inner wall, and the area between the outer and inner walls is squeezed outward. In actual production, the elastic sleeve 4 can be made of rubber.

[0048] Example 2

[0049] Based on Example 1, Figure 1 As shown, the second mounting section 15 also includes an inner cylinder 17 made of a rigid material. The inner cylinder 17 is sleeved onto the second mounting section 15, and the elastic sleeve 4 is sleeved onto the inner cylinder 17 and fixedly connected to the inner cylinder 17. Directly sleeved onto the second mounting section 15, the elastic sleeve 4 generates significant friction between the elastic sleeve 4 and the outer wall of the second mounting section 15, making installation difficult. However, the friction between the inner cylinder 17 and the outer wall of the second mounting section is much smaller when the inner cylinder 17 is made of a rigid material. Therefore, sleeved onto the second mounting section 15 via the inner cylinder 17, the elastic sleeve 4 is easier to install. The fixed connection between the elastic sleeve 4 and the inner cylinder 17 can be achieved by any suitable method, such as bonding or vulcanization.

[0050] Specifically, if Figure 1 As shown in , an external thread is provided on the surface of the positioning section 16, and the positioning component 6 is a nut that matches the external thread, so that the positioning component 6 is threadedly connected to the positioning section 16 and abuts against the end surface of the inner cylinder 17 by screwing in. It should be noted that when the elastic sleeve 4 is actually installed, the positioning component 6 can be screwed into the positioning section 16, driving the inner cylinder 17 to move the elastic sleeve 4 to the target position, thereby achieving the installation of the elastic sleeve 4.

[0051] Furthermore, if Figure 1As shown, the outer sleeve 18, made of a rigid material, is also included. The outer sleeve 18 is sleeved over the elastic sleeve 4 and fixedly connected thereto, allowing the elastic sleeve 4 to abut against the inner wall of the second through hole 12 through the outer sleeve 18. Directly inserting the elastic sleeve 4 into the second through hole 12 would generate significant friction between the elastic sleeve 4 and the inner wall of the second through hole 12, making installation difficult. However, the friction between the outer sleeve 18 and the inner wall of the second through hole 12 is much less when the outer sleeve 18 is made of a rigid material. Therefore, inserting the elastic sleeve 4 into the second through hole 12 through the outer sleeve 18 facilitates installation. The fixed connection between the elastic sleeve 4 and the outer sleeve 18 can be achieved by any suitable method, such as bonding or vulcanization.

[0052] Example 3

[0053] Based on the second embodiment, this embodiment specifically introduces a structural form of the elastic sleeve 4, such as Figure 2 、 3 As shown, the elastic sleeve 4 includes N buffer segments 19, which are arranged in sequence along the circumference of the second through hole 12. At the same time, the outer cylinder 18 includes N cylinder shoes 20, which are arranged in sequence along the circumference of the second through hole 12, and the N cylinder shoes 20 are connected to the N buffer segments 19 in a one-to-one correspondence. Figure 2 As shown, when the elastic sleeve 4 is in a free state, two adjacent buffer sections 19 are separated from each other.

[0054] Furthermore, if Figure 2 As shown in FIG, the buffer segment 19 has an abutting end surface 21 facing the adjacent buffer segment 19, as shown in FIG. Figure 3 As shown, when the elastic sleeve 4 is subjected to radial pressure, the buffer segment 19 can deform so that the two abutting end surfaces 21 of two adjacent buffer segments 19 are abutted together. At this time, a vibration-damping groove 22 is provided on the abutting end surfaces. When the two abutting end surfaces 21 of two adjacent buffer segments 19 are abutted together, the two vibration-damping grooves 22 on the two abutting end surfaces 21 jointly form a vibration-damping space 23.

[0055] Example 4

[0056] Based on the second embodiment, this embodiment specifically introduces another structural form of the elastic sleeve 4, such as Figure 4As shown, a first vibration-damping hole 24 with an axis parallel to the axis of the elastic sleeve 4 is provided in the side wall of the elastic sleeve 4. There are at least two first vibration-damping holes 24, and on a cross section perpendicular to the axis of the elastic sleeve 4, the line connecting the points formed by the axes of at least two first vibration-damping holes 24 is a straight line L1, with the points formed by the axis of the elastic sleeve 4 lying on straight line L1. In actual operation, the direction of external torque applied to the elastic sleeve 4 is fixed. The specific installation principle of the elastic sleeve 4 is that, on a cross section perpendicular to the axis of the elastic sleeve 4, straight line L1 is perpendicular to the direction of torque applied to the elastic sleeve 4. This makes it easier for the elastic sleeve 4 to deform along straight line L1, thereby reducing the risk of damage.

[0057] Furthermore, if Figure 4 As shown, a second vibration-damping hole 25 whose axis is parallel to the axis of the elastic sleeve 4 is provided in the side wall of the elastic sleeve 4; the number of the second vibration-damping holes 25 is at least two, and on a cross section perpendicular to the axis of the elastic sleeve 4, the line connecting the points formed by the axes of at least two second vibration-damping holes 25 is a straight line L2, the point formed by the axis of the elastic sleeve 4 is located on the straight line L2, and the straight line L1 is perpendicular to the straight line L2. According to the installation principle of the elastic sleeve 4 described above, the extension direction of the straight line L2 on the cross section perpendicular to the axis of the elastic sleeve 4 is consistent with the direction of the torque applied to the elastic sleeve 4, which can make it easier for the elastic sleeve 4 to deform along the straight line L2, further reducing the risk of damage. Figure 4 As shown in , in the radial direction of the elastic sleeve 4, the maximum distance between the inner walls of the first vibration-damping hole 24 is A, the maximum distance between the inner walls of the second vibration-damping hole 25 is B, and A>B. According to the installation principle of the elastic sleeve 4 described above, on the cross section perpendicular to the axis of the elastic sleeve 4, a straight line L2 is drawn. This ensures that the elastic sleeve 4 is less flexible along the extension direction of the straight line L2 than along the straight line L1, that is, the elastic sleeve 4 is more likely to deform along the direction of the straight line L1. In this way, the elastic sleeve 4 can reduce its restraining force along the direction of L1 while ensuring the bearing capacity along the direction of L2. In actual operation, the elastic sleeve 4 now deforms along the extension direction of L1. When the deformation in this direction is too large, it deforms along the direction of L2, causing the second vibration-damping hole 25 to close, thereby preventing damage to the elastic sleeve 4 caused by excessive deformation compensation.

[0058] Example 5

[0059] Based on the first embodiment, this embodiment introduces the specific structural form of the limiting component 5, such as Figure 5As shown, the limiting component 5 is a cylindrical body having an accommodating through hole 26, and its outer contour matches the shape of the first hole segment 10. The first mounting segment 13 is located within the accommodating through hole 26. In actual production, the shape of the first mounting segment 13 is spherical, and the shape of the accommodating through hole 26 matches the shape of the first mounting segment 13.

[0060] In one embodiment, the limiting component 5 is made of a rigid material and is fixedly connected to the inner wall of the first hole segment 10. The first mounting segment 13 is able to rotate relative to the limiting component 5 within the accommodating through-hole 26. This structural approach ensures that the limiting component 5 effectively limits the first mounting segment 13, thereby more effectively preventing the second mounting segment 15 from significantly displacing within the second through-hole 12 (i.e., relative displacement between the second mounting segment 15 and the inner wall of the second through-hole 12) and potentially damaging the elastic sleeve 4.

[0061] Example 6

[0062] This embodiment introduces an improved form of the limiting component 5 in Example 5. The component 5 is made of elastic material (for example), and its outer wall abuts against the inner wall of the first hole section 10, and the outer wall of the first mounting section 13 abuts against the inner wall of the accommodating through hole 26.

[0063] Specifically, if Figure 6 As shown, the limiting component 5 is made of a flexible material, and an annular air-filled space 27 extending axially is provided in the side wall of the limiting component 5. An air inlet 28 is provided on the outer surface of the limiting component 5 to allow external fluid (such as air) to enter the air-filled space 27. When the external fluid enters the air-filled space 27, the limiting component 5 can be deformed, so that the outer wall of the limiting component 5 fits with the inner wall of the first hole section 10, and at the same time, the inner wall of the accommodating through hole 26 fits with the outer wall of the first mounting section 13. In actual production, it can be as follows Figure 6 As shown in , a blocking component (such as a check valve) is provided on the air inlet 28 to prevent the gas in the inflation space from being discharged through the air inlet 28 .

[0064] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A flexible joint coupling, characterized in that: include: A first coupling (1), a second coupling (2), a connecting member (3), an elastic sleeve (4), a limiting member (5) and a positioning member (6); The first coupling (1) has a first surface (7) and a second surface (8) facing each other, a first through hole (9) penetrating the first surface (7) and the second surface (8) is provided on the first coupling (1), the first through hole (9) including a first hole section (10) forming an opening on the first surface (7) and a second hole section (11) forming an opening on the second surface (8), a second through hole (12) is provided on the second coupling (2), the second coupling (2) faces the second surface (8), and the axis of the second through hole (12) coincides with the axis of the first through hole (9); The connecting member (3) comprises a first mounting section (13), a connecting section (14), a second mounting section (15) and a positioning section (16) arranged in sequence, wherein the first mounting section (13) is located within the first hole section (10), the connecting section (14) is arranged in the second hole section (11), the second mounting section (15) extends into the second through hole (12), and the positioning section (16) extends from a side of the second through hole (12) away from the first coupling (1); The elastic sleeve (4) is sleeved on the second mounting section (15), and the outer wall thereof can abut against the inner wall of the second through hole (12); the positioning component (6) is arranged on the positioning section for fixing the elastic sleeve (4) within the second through hole (12); and the limiting component (5) is arranged between the first mounting section (13) and the inner wall of the first hole section (10) for limiting the relative position between the first mounting section (13) and the inner wall of the first hole section (10).

2. The flexible joint coupling according to claim 1, characterized in that: Also included is an inner cylinder (17) made of a rigid material; The inner cylinder (17) is sleeved on the second mounting section (15), and the elastic sleeve (4) is sleeved on the inner cylinder (17) and fixedly connected to the inner cylinder (17).

3. The flexible joint coupling according to claim 2, characterized in that: An external thread is provided on the surface of the positioning section (16), and the positioning component (6) is a nut matching the external thread, so that the positioning component (6) is threadedly connected to the positioning section (16) and abuts against the end surface of the inner cylinder (17) through screwing action.

4. The flexible joint coupling according to claim 1, characterized in that: Also included is an outer cylinder (18) made of a rigid material; The outer cylinder (18) is sleeved on the elastic sleeve (4) and fixedly connected to the elastic sleeve (4), so that the elastic sleeve (4) can abut against the inner wall of the second through hole (12) through the outer cylinder (18).

5. The flexible joint coupling according to claim 4, characterized in that: The elastic sleeve (4) comprises N buffer segments (19), the N buffer segments (19) being arranged in sequence along the circumference of the second through hole (12), and when the elastic sleeve (4) is in a free state, two adjacent buffer segments (19) are separated from each other; The outer cylinder (18) comprises N cylinder tiles (20), the N cylinder tiles (20) being arranged in sequence along the circumference of the second through hole (12), and the N cylinder tiles (20) being connected to the N buffer sections (19) in a one-to-one correspondence.

6. The flexible joint coupling according to claim 5, characterized in that: The buffer segment (19) has an abutting end surface (21) facing the adjacent buffer segment (19), and when the elastic sleeve (4) is subjected to radial pressure, the buffer segment (19) can be deformed so that the two abutting end surfaces (21) of the two adjacent buffer segments (19) fit together; A vibration-damping groove (22) is provided on the abutting end surface. When the two abutting end surfaces (21) of two adjacent buffer sections (19) are fitted together, the two vibration-damping grooves (22) on the two abutting end surfaces (21) jointly form a vibration-damping space (23).

7. The flexible joint coupling according to claim 1, characterized in that: On a cross section passing through the axis of the elastic sleeve (4), the elastic sleeve (4) is in a shape that tapers from the inner wall toward the outer wall.

8. The flexible joint coupling according to claim 1, characterized in that: A first vibration-damping hole (24) having an axis parallel to the axis of the elastic sleeve (4) is provided in the side wall of the elastic sleeve (4); The number of the first vibration-damping holes (24) is at least two, and on a cross section perpendicular to the axis of the elastic sleeve (4), a line connecting the points formed by the axes of at least two of the first vibration-damping holes (24) is a straight line L1, and the point formed by the axis of the elastic sleeve (4) is located on the straight line L1.

9. The flexible joint coupling according to claim 8, characterized in that: A second vibration-damping hole (25) having an axis parallel to the axis of the elastic sleeve (4) is provided in the side wall of the elastic sleeve (4); The number of the second vibration-damping holes (25) is at least two, and on a cross section perpendicular to the axis of the elastic sleeve (4), a line connecting the points formed by the axes of at least two of the second vibration-damping holes (25) is a straight line L2, the points formed by the axis of the elastic sleeve (4) are located on the straight line L2, and the straight line L1 is perpendicular to the straight line L2; In the radial direction of the elastic sleeve (4), the maximum distance between the inner walls of the first vibration-damping holes (24) is A, the maximum distance between the inner walls of the second vibration-damping holes (25) is B, and A>B.

10. The flexible joint coupling according to any one of claims 1 to 9, characterized in that: The limiting component (5) is a cylindrical body having an accommodating through hole (26), and the outer shape matches the shape of the first hole section (10), and the first mounting section (13) is located within the accommodating through hole (26).

11. The flexible joint coupling according to claim 10, characterized in that: The limiting component (5) is made of a rigid material and is fixedly connected to the inner wall of the first hole section (10); the first mounting section (13) is rotatable relative to the limiting component (5) within the accommodating through hole (26).

12. The flexible joint coupling according to claim 11, characterized in that: The shape of the first mounting section (13) is spherical, and the shape of the accommodating through hole (26) matches the shape of the first mounting section (13).

13. The flexible joint coupling according to claim 10, characterized in that: The limiting component (5) is made of elastic material, and its outer wall abuts against the inner wall of the first hole section (10), and the outer wall of the first mounting section (13) abuts against the inner wall of the accommodating through hole (26).

14. The flexible joint coupling according to claim 10, characterized in that: The limiting component (5) is made of a flexible material, an annular air-filled space (27) extending in the axial direction is provided in the side wall of the limiting component (5), and an air inlet (28) is provided on the outer surface of the limiting component (5) for allowing external fluid to enter the air-filled space (27); When external fluid enters the inflation space (27), the limiting component (5) can be deformed, so that the outer wall of the limiting component (5) fits with the inner wall of the first hole section (10), and at the same time, the inner wall of the accommodating through hole (26) fits with the outer wall of the first mounting section (13).

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