A coupling

Abstract

The application discloses a coupling, which comprises a pair of flanges and a center pipe, the pair of flanges are oppositely arranged; the center pipe is located between the pair of flanges and coaxially arranged with the flanges; a diaphragm, an annular diaphragm and a torque absorption pad are coaxially arranged between the end of the center pipe and the corresponding flange in sequence; the inner diameter part of the diaphragm is fixedly connected with the end of the center pipe; the outer diameter part of the annular diaphragm is fixedly connected with the outer diameter part of the corresponding diaphragm; the torque absorption pad is fixed on the outer diameter part of the annular diaphragm and the flange respectively, and is used for connecting the annular diaphragm and the flange. The coupling provided by the application can absorb the alignment error between the driving shaft and the driven shaft.

Description

Technical Field

[0001] This invention relates to the field of general mechanical components, and more specifically to a coupling for absorbing alignment errors between a drive shaft and a driven shaft. Background Technology

[0002] Couplings are core components for transmitting power in the mechanical field. They have a wide range of applications, mainly connecting the driving shaft and the driven shaft to transmit torque so that the driving and driven shafts rotate together.

[0003] Commonly used couplings typically employ gear or snap-fit ​​connections. The coupling operates or disengages through telescoping. This type of coupling is a rigid connection during operation. Sudden torque changes during the rotation of the drive shaft can cause severe fluctuations when transmitted to the driven shaft. Continuous vibrations from the drive shaft during operation can also be transmitted to the driven shaft. This makes overload protection impossible, affecting the dynamic performance between the drive and driven shafts. Furthermore, prolonged continuous vibration can accelerate component damage and affect the alignment error between the drive and driven shafts.

[0004] For example, patent CN107339330A discloses a gear coupling comprising two half-couplings joined together. This coupling can achieve strict alignment, thereby ensuring a stable connection. However, this gear coupling is a rigid connection and cannot provide overload protection for the driving and driven shafts, nor does it have the ability to compensate for axial, radial, and angular displacements. Summary of the Invention

[0005] Purpose of the invention: The technical problem to be solved by the present invention is to provide a coupling that can achieve overload protection and has the ability to compensate for axial displacement, radial displacement and angular displacement, in order to overcome the shortcomings of the prior art.

[0006] To address the aforementioned technical problems, this invention discloses a coupling comprising a pair of flanges and a central tube, the pair of flanges being arranged opposite to each other; the central tube being located between the pair of flanges and coaxially arranged with the flanges; a diaphragm, an annular diaphragm, and a torque-absorbing pad being sequentially and coaxially arranged between the end of the central tube and the corresponding flange; the inner diameter portion of the diaphragm being fixedly connected to the end of the central tube; the outer diameter portion of the annular diaphragm being fixedly connected to the outer diameter portion of the corresponding diaphragm; and the torque-absorbing pad being fixedly fixed to the outer diameter portion of the annular diaphragm and the flange, respectively, for connecting the annular diaphragm and the flange.

[0007] Specifically, the torque absorbing pad is an I-shaped hollow cylinder. The torque absorbing pad includes a pair of annular end plates and a tubular connecting part. The pair of annular end plates are arranged opposite to each other. The tubular connecting part is fixedly connected to the pair of annular end plates. Each annular end plate is provided with a plurality of radial closed grooves. One annular end plate is fixedly connected to the outer diameter of the annular diaphragm, and the other annular end plate is fixedly connected to the corresponding flange.

[0008] Furthermore, the torque absorbing pad also includes a first mounting hole, which is located at the radially outer closed end of the radial closed groove of each annular end plate of the torque absorbing pad; one side of the annular end plate of the torque absorbing pad is fixedly connected to the outer diameter portion of the annular diaphragm through the first mounting hole and the eccentric wheel device; the other side of the annular end plate of the torque absorbing pad is fixedly connected to the flange through the first mounting hole and bolts.

[0009] Optionally, the radial closed grooves of the two annular end plates of the torque absorbing pad are staggered relative to each other along the circumferential direction of the annular end plates.

[0010] The annular diaphragm includes an annular diaphragm body and a plurality of radially opening slots formed on the annular diaphragm body. Each radially opening slot of the annular diaphragm includes a radially inner opening end and a radially outer closing end.

[0011] Optionally, the radial opening grooves of the annular diaphragm are uniformly distributed along the circumferential direction of the annular diaphragm.

[0012] Furthermore, the diaphragm also includes a flexible portion located between the inner diameter portion and the outer diameter portion of the diaphragm.

[0013] Furthermore, the coupling also includes an elastic ring sandwiched between the diaphragm and the annular diaphragm.

[0014] Optionally, the coupling also includes a pair of opposing protective covers, which are respectively fixedly connected to the outer diameter portion of the corresponding diaphragm and cover the outer peripheral surface of the annular diaphragm and the outer peripheral surface of the torque absorption pad.

[0015] Optionally, the inner diameter portion of the diaphragm is fixedly connected to the end of the central tube by welding.

[0016] Beneficial effects:

[0017] (1) This invention provides a coupling installed between a driving shaft and a driven shaft. During the transmission of rotational torque from the driving shaft to the driven shaft, the entire system will inevitably experience relative errors such as angular displacement and axial displacement, as well as elastic errors. When the coupling is in normal working condition, the coupling provided by this invention absorbs the elastic errors during the transmission process through an annular diaphragm and an elastic ring, and corrects relative errors such as angular displacement and axial displacement through a torque absorption pad, which can effectively improve the transmission of rotational torque and reduce the risk of coupling damage.

[0018] (2) The torque absorbing pad used in the coupling of the present invention is an I-shaped hollow cylinder, including a pair of oppositely arranged annular end plates and a tubular connecting part that is fixedly connected to the pair of annular end plates. By providing a number of radial closed grooves on each annular end plate, when the coupling is in an overspeed working state, the torque absorbing pad undergoes radial deformation from the outside to the inside after absorbing the excess torque. When the radial deformation reaches a certain extent, the torque absorbing pad undergoes axial fracture, thereby ensuring that only the torque absorbing pad is damaged, thus protecting other components in the coupling. In addition, in the torque absorbing pad, the pair of annular end plates are separated by the tubular connecting part and do not interfere with each other, which can enhance the torque absorbing pad 7's ability to absorb misalignment.

[0019] (3) The structure of the present invention is relatively simple, easy to process, and has low production cost. The components of each part will not interfere with each other. When the transmission shaft drives the coupling to rotate, the load of the system is good and reliable because the parts of the entire coupling absorb most of the torque and elasticity. At the same time, the possibility of failure is low even if repeated operation occurs. Attached Figure Description

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, and the advantages of the present invention in the above and / or other aspects will become clearer.

[0021] Figure 1 This is a cross-sectional view of the overall structure of the coupling provided in Embodiment 1 of the present invention;

[0022] Figure 2 for Figure 1 A partial cross-sectional view of the connection where the protective cover, diaphragm, annular diaphragm, and torque absorption pad are sequentially fastened together in the coupling shown;

[0023] Figure 3 for Figure 1 A partial cross-sectional view of the torque absorption pad and flange fastening connection in the coupling shown;

[0024] Figure 4 A front view of the torque-absorbing pad provided in Embodiment 1 of the present invention;

[0025] Figure 5 for Figure 4 A schematic diagram of the three-dimensional structure of the torque absorption pad is shown.

[0026] Figure 6 A front view of the annular diaphragm provided in Embodiment 1 of the present invention;

[0027] Figure 7 for Figure 6 A schematic diagram of the three-dimensional structure of the annular diaphragm shown;

[0028] Figure 8 This is a cross-sectional view of the overall structure of the coupling provided in Embodiment 2 of the present invention;

[0029] Figure 9 This is a three-dimensional structural diagram of the torque absorption pad provided in Embodiment 2 of the present invention;

[0030] Figure 10 This is a three-dimensional structural diagram of the annular diaphragm provided in Embodiment 2 of the present invention. Detailed Implementation

[0031] The reference numerals in the accompanying drawings of this application are as follows:

[0032] Coupling 1; Central tube 2, End 21; Diaphragm 3, Outer diameter 31, Inner diameter 32, Flexible portion 33; Protective cover 4, Elastic ring 5; Annular diaphragm 6, Outer diameter 61, Radial opening groove 63, Inner opening end 631 of radial opening groove 63, Outer closed end 632 of radial opening groove 63, Annular diaphragm body 64, Second mounting hole 65; Torque absorption pad 7, Annular end plate 71, Tubular connection 72, Radial closed groove 73, Outer closed end 731 of radial closed groove 73, First mounting hole 74; Flange 8, Connecting hole 81; Bolt 9, Eccentric wheel device 10.

[0033] The technical solution of this application will now be described in detail with reference to the accompanying drawings.

[0034] Example 1

[0035] according to Figures 1 to 5 Example 1 will be explained below. Figure 1 The structure on the right side of coupling 1 in Embodiment 1 is shown. Figure 1 The left-side structure is omitted, but the left side of coupling 1 has a similar structure. In this embodiment, coupling 1 is installed between the driving shaft and the driven shaft arranged in a straight line, with the driving shaft transmitting rotational torque to the driven shaft. Neither the driving shaft nor the driven shaft is shown in the figure.

[0036] like Figure 1As shown, the coupling 1 includes a pair of flanges 8 and a central tube 2, which are arranged opposite to each other. The central tube 2 is a cylindrical hollow metal part, located between the pair of flanges 8 and coaxially arranged with them. A diaphragm 3, an annular diaphragm 6, and a torque-absorbing pad 7 are sequentially and coaxially arranged between the end 21 of the central tube 2 and the corresponding flange 8. Figure 1 As shown, the diaphragm 3 is a ring-shaped metal part, including an inner diameter portion 32 and an outer diameter portion 31. The inner diameter portion 32 of the diaphragm 3 is fixedly connected to the end 21 of the central tube 2 by welding. Figure 2 As shown, the outer diameter portion 61 of the annular diaphragm 6 is fixedly connected to the corresponding outer diameter portion 31 of the diaphragm 3. Figure 2 and Figure 3 As shown, the torque-absorbing pad 7 is fixed to the outer diameter portion 61 of the annular diaphragm 6 and the flange 8, respectively, for connecting the annular diaphragm 6 and the flange 8. The flange 8 has a connecting hole 81 for connecting the drive shaft or the driven shaft.

[0037] The rotational torque from the drive shaft is transmitted from the flange 8 on the drive shaft side through the torque-absorbing pad 7, the annular diaphragm 6, and the diaphragm 3 to the central tube 2, and then through the diaphragm 3, the annular diaphragm 6, the torque-absorbing pad 7, and the flange 8 on the driven shaft side to the driven shaft. During the transmission of rotational torque, the coupling 1 absorbs relative errors such as axial displacement, shaft misalignment, and angular displacement between the drive and driven shafts, as well as the resulting elasticity. During the assembly of various components, some parts may have errors due to machining or welding, and the mounting holes may be slightly misaligned; this can be corrected using bolts or eccentric wheel devices. During normal operation, coupling 1 will inevitably experience relative errors such as axial displacement, shaft misalignment, and angular displacement due to the forces and rotational torque. The diaphragm 3, annular diaphragm 6, and torque absorption pad 7 in coupling 1 have a certain degree of elasticity, which can absorb the errors and elasticity generated between the driving and driven shafts to a large extent. They will not be damaged under the action of compression, tension, and selection, so that the system load is at a normal level and coupling 1 can work normally.

[0038] like Figure 1 As shown, the diaphragm 3 also includes a flexible portion 33, which is located between the inner diameter portion 32 and the outer diameter portion 31 of the diaphragm 3. The flexible portion 33 is thinned, meaning its thickness is thinner than that of its adjacent portions. When the outer diameter portion 31 and the inner diameter portion 32 of the diaphragm 3 undergo axial displacement or axial offset, the flexible portion 33 can bend.

[0039] Specifically, the flexural portion 33 is thinner than other parts of the part. When the outer diameter portion 31 and the inner diameter portion 32 of the diaphragm 3 undergo axial displacement or axial offset, the flexural portion 33 can deform. After the external force is applied, the diaphragm 3 can recover its original shape to a certain extent.

[0040] like Figure 4 and Figure 5 As shown, the torque-absorbing pad 7 is an H-shaped hollow cylinder. The torque-absorbing pad 7 includes a pair of annular end plates 71 and a tubular connecting portion 72, the pair of annular end plates 71 being arranged opposite each other. The tubular connecting portion 72 is fixedly connected to the pair of annular end plates 71. Each annular end plate 71 is provided with several radially closed grooves 73 to absorb the torque generated by the coupling 1. One annular end plate 71 is fixedly connected to the outer diameter portion 61 of the annular diaphragm 6, and the other annular end plate 71 is fixedly connected to the corresponding flange 8.

[0041] When coupling 1 is in normal working condition, the driving shaft transmits torque to the driven shaft through coupling 1, causing the driven shaft to rotate. The torque-absorbing pad 7 absorbs minor torsional deformation caused by the torque generated within the system, as well as deformation caused by compression, thus reducing the possibility of damage to coupling 1. When the coupling is in an overspeed operating state, the torque generated within the system may damage coupling 1. At this time, the torque-absorbing pad 7 begins to function. Because the torque-absorbing pad 7 is an I-shaped hollow cylinder, it undergoes radial deformation from the outside to the inside after absorbing excess torque. When the radial deformation reaches a certain extent, the torque-absorbing pad 7 breaks axially, ensuring that only the torque-absorbing pad 7 is damaged, thereby protecting other components within coupling 1. Replacing the torque-absorbing pad 7 will restore the normal operation of coupling 1.

[0042] Furthermore, in the torque-absorbing pad 7, the pair of annular end plates 71 are separated by the tubular connecting portion 72 and do not interfere with each other, which enhances the torque-absorbing pad 7's ability to absorb misalignment.

[0043] like Figure 4 As shown, the torque absorbing pad 7 further includes a first mounting hole 74, which is located at the radially outer closed end 731 of the radially closed groove 73 of the torque absorbing pad 7. Figure 2 As shown. The annular end plate 71 on one side of the torque-absorbing pad 7 is fixedly connected to the outer diameter portion 61 of the annular diaphragm 6 through the first mounting hole 74 and the eccentric wheel device 10. (See diagram) Figure 3 As shown, the annular end plate 71 on the other side of the torque absorption pad 7 is fixedly connected to the flange 8 through the first mounting hole 74 and bolts 9.

[0044] like Figure 5As shown, optionally, the radial closed grooves 73 of the two annular end plates 71 of the torque absorbing pad 7 are staggered from each other along the circumferential direction of the annular end plates 71 to prevent interference from the fastening connection device that mates with the first mounting holes of the two annular end plates 71.

[0045] like Figure 6 and Figure 7 As shown, the annular diaphragm 6 includes an annular diaphragm body 64 and a plurality of radial openings 63 formed on the annular diaphragm body 64. Each radial opening 63 of the annular diaphragm 6 includes a radially inner opening end 631 and a radially outer closed end 632.

[0046] The working section of the annular diaphragm 6 is an annular portion that absorbs elasticity along the axial direction of the coupling 1. When the coupling 1 is in normal operation, the drive shaft drives the driven shaft through the coupling 1. The torque generated within the system is absorbed by the annular diaphragm 6 and the torque-absorbing pad 7. Minor deformations in the system are transmitted from the annular diaphragm 6 to the torque-absorbing pad 7. Simultaneously, the annular diaphragm 6 also absorbs elasticity generated within the system. When the coupling 1 is operating at overspeed, both the annular diaphragm 6 and the torque-absorbing pad 7 deform simultaneously due to absorbing excess torque within the system. However, because the deformation space around the annular diaphragm 6 is small, almost nonexistent, the annular diaphragm 6 transmits the minor deformation to the torque-absorbing pad 7, causing the torque-absorbing pad 7 to deform. When the deformation reaches a certain extent, the torque-absorbing pad 7 breaks. At this point, only the torque-absorbing pad 7 is damaged; the probability of damage to the annular diaphragm 6 is far lower than that of the torque-absorbing pad 7. Therefore, only the torque-absorbing pad 7 needs to be replaced for the coupling 1 to return to normal operation.

[0047] like Figure 6 As shown, the radial opening grooves 63 of the annular diaphragm 6 are uniformly distributed along the circumference of the annular diaphragm 6.

[0048] like Figure 1 As shown, the coupling 1 also includes an elastic ring 5, which is sandwiched between the diaphragm 3 and the annular diaphragm 6. The elastic ring 5 is made of an elastic material, such as high-quality natural rubber. When subjected to force, the elastic ring 5 will twist or stretch, and will return to its original shape after the force is removed. When the coupling 1 is working, due to the properties of the material of the elastic ring 5, the elastic ring 5 can fully absorb the torque and elasticity transmitted by the diaphragm 3 and the annular diaphragm 6, and has a good buffering effect on impact loads.

[0049] like Figure 1As shown, the coupling 1 also includes a pair of opposing protective covers 4. The protective covers 4 are cup-shaped parts, and are respectively fixedly connected to the outer diameter portion 31 of the corresponding diaphragm 3, covering the outer peripheral surface of the annular diaphragm 6 and the outer peripheral surface of the torque absorption pad 7. The middle portion of the protective cover 4 has an opening larger than that of the central tube 2, so that the end 21 of the central tube 2 passes through the opening of the annular diaphragm 6 and is fixedly connected to the inner diameter portion 32 of the diaphragm 3.

[0050] like Figure 6 As shown, a second mounting hole 65 for fixed connection with the outer diameter portion 31 of the corresponding diaphragm 3 is provided at the radially outer closed end 632 of the radially open groove 63 of the annular diaphragm 6. Figure 2 As shown, the eccentric wheel device 10 passes through the second mounting hole 65 of the protective cover 4, the diaphragm 3, the annular diaphragm 6, and the first mounting hole 74 of the torque absorption pad 7 in sequence, and then fastens the protective cover 4, the diaphragm 3, the annular diaphragm 6, and the torque absorption pad 7 together.

[0051] Example 2

[0052] like Figure 8 As shown, unlike Embodiment 1, the coupling 1 of Embodiment 2 has multiple annular diaphragms 6 and multiple torque-absorbing pads 7 stacked together. Parts identical to those in Embodiment 1 are indicated by the same reference numerals, and descriptions are omitted.

[0053] like Figure 9 As shown, in this embodiment, each annular end plate 71 of the torque absorbing pad 7 is provided with eight radially closed grooves 73 to improve the coupling 1's ability to absorb relative errors such as elasticity, axial displacement, and angular displacement generated during the transmission of rotational torque. Each radially closed end 731 of the radially closed groove 73 of the torque absorbing pad 7 in this embodiment is provided with a first mounting hole 74 for bolt connection. In this embodiment, the first mounting holes 74 of the two annular end plates 71 of the torque absorbing pad 7 are arranged opposite each other and fixedly connected by bolts.

[0054] At the same time, such as Figure 10 As shown, the annular diaphragm 6 in this embodiment is provided with eight radially open slots 63, and each radially open slot 63 has a second mounting hole 65 at its radially outer closed end 632 for fixed connection with the outer diameter portion 31 of the corresponding diaphragm 3. This embodiment improves the coupling 1's ability to absorb the elasticity generated during the transmission of rotational torque by increasing the number of radially open slots 63.

[0055] This invention provides a concept and method for a coupling. Many methods and approaches exist for implementing this technical solution; the above description is merely a preferred embodiment of the invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention. All components not explicitly stated in this embodiment can be implemented using existing technologies.

Claims

1. A coupling, characterized in that, The device includes a pair of flanges (8) and a central tube (2), the pair of flanges (8) being arranged opposite to each other; the central tube (2) is located between the pair of flanges (8) and is coaxially arranged with the flanges (8); a diaphragm (3), an annular diaphragm (6) and a torque absorption pad (7) are arranged coaxially between the end (21) of the central tube (2) and the corresponding flange (8); the inner diameter portion (32) of the diaphragm (3) is fixedly connected to the end (21) of the central tube (2) by welding; the outer diameter portion (61) of the annular diaphragm (6) is fixedly connected to the outer diameter portion (31) of the corresponding diaphragm (3); The torque absorbing pad (7) is an I-shaped hollow cylinder. The torque absorbing pad (7) includes a pair of annular end plates (71) and a tubular connecting part (72). The pair of annular end plates (71) are arranged opposite to each other. The tubular connecting part (72) is fixedly connected to the pair of annular end plates (71). Each annular end plate (71) is provided with a plurality of radial closed grooves (73). One annular end plate (71) is fixedly connected to the outer diameter part (61) of the annular diaphragm (6), and the other annular end plate (71) is fixedly connected to the corresponding flange (8). The torque absorbing pad (7) further includes a first mounting hole (74), which is located at the radially outer closed end (731) of the radial closed groove (73) of each annular end plate (71) of the torque absorbing pad (7); one side of the annular end plate (71) of the torque absorbing pad (7) is fixedly connected to the outer diameter portion (61) of the annular diaphragm (6) through the first mounting hole (74) and the eccentric wheel device (10); the other side of the annular end plate (71) of the torque absorbing pad (7) is fixedly connected to the flange (8) through the first mounting hole (74) and the bolt (9). The annular diaphragm (6) includes an annular diaphragm body (64) and a plurality of radial opening slots (63) formed on the annular diaphragm body (64). Each radial opening slot (63) of the annular diaphragm (6) includes a radially inner opening end (631) and a radially outer closed end (632). A second mounting hole (65) is provided at the radially outer closed end (632) of the annular diaphragm (6). The eccentric wheel device (10) passes through the second mounting hole (65) of the diaphragm (3), the annular diaphragm (6), and the first mounting hole (74) on one side of the annular end plate (71) of the torque absorption pad (7), and is used to fix the outer diameter portion (61) of the annular diaphragm (6) to the one side of the annular end plate (71) of the torque absorption pad (7), and the outer diameter portion (61) of the annular diaphragm (6) is fixedly connected to the outer diameter portion (31) of the corresponding diaphragm (3); The radial closed grooves (73) of the two annular end plates (71) of the torque absorption pad (7) are staggered from each other along the circumferential direction of the annular end plates (71).

2. The coupling according to claim 1, characterized in that, The radial opening grooves (63) of the annular diaphragm (6) are uniformly distributed along the circumference of the annular diaphragm (6).

3. A coupling according to claim 2, characterized in that, The diaphragm (3) also includes a flexure (33) located between the inner diameter portion (32) and the outer diameter portion (31) of the diaphragm (3).

4. A coupling according to claim 3, characterized in that, It also includes an elastic ring (5), which is sandwiched between the diaphragm (3) and the annular diaphragm (6).

5. A coupling according to claim 4, characterized in that, It also includes a pair of protective covers (4) arranged opposite to each other, the protective covers (4) being fixedly connected to the outer diameter portion (31) of the corresponding diaphragm (3) and covering the outer peripheral surface of the annular diaphragm (6) and the outer peripheral surface of the torque absorption pad (7).

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