resilient coupling

Abstract

The present application relates to the field of transmission technology, in order to solve the problem that the existing elastic coupling is not easy to smoothly transition in the coupling moment of arranging elastic elements in the radial side circumferential direction, the present application constructs an elastic coupling, which comprises a driving disc device and a driven disc, the driven disc device comprises a shell, two driven discs arranged in the axial direction in the inner cavity of the shell, two elastic bodies, and a driving disc, the two elastic bodies are arranged on the axial outer sides of the two driven discs correspondingly; a guide mechanism is arranged between the driven disc and the inner cavity wall surface of the shell, which enables the driven disc to only move axially; the driving disc is arranged between the two driven discs; at least one axial side of the driving disc opposite to the adjacent driven disc has a wedge surface structure abutting against the other axial side, and the wedge surface in the wedge surface structure is configured to push the driven disc to move axially when the driving disc rotates relative to the driven disc. The present application is convenient to arrange the elastic body with non-linear stiffness characteristics, and realizes the non-linear torque-angle characteristics.

Description

Technical Field

[0001] This invention relates to the field of transmission technology, and more specifically, to a flexible coupling. Background Technology

[0002] Couplings are frequently used components in the power transmission process of mechanical systems to transmit torque and motion. Based on whether they contain elastic elements, couplings can be divided into flexible couplings and rigid couplings: rigid couplings require the centerlines of the two shafts being connected to be strictly aligned, allowing only a small amount of displacement and misalignment; otherwise, assembly stress will be generated during operation, causing the equipment to vibrate and produce a lot of noise. Flexible couplings contain elastic elements and have buffering and vibration damping functions.

[0003] Existing common flexible couplings primarily absorb radial vibrations through radially distributed elastic elements. These elements often use helical springs, which have linear stiffness characteristics, low damping, and slow vibration decay. There is also an impact when the springs coil out of contact. To achieve nonlinear torque-angle characteristics, multiple elastic elements need to be combined, and the coupling of different elements is not easily smoothed. Furthermore, additional elastic elements are needed in the axial direction to absorb axial vibrations. Existing high-elasticity couplings have a large number and variety of elastic elements, resulting in complex structures, large overall dimensions, and high costs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is the disadvantage caused by the radial side circumferential arrangement of elastic elements in existing flexible couplings, and a flexible coupling is provided.

[0005] The technical solution of this invention to achieve its objective is as follows: An elastic coupling is constructed, comprising a driven disc device and a driving disc. The driven disc device includes a housing, two driven discs arranged axially within the housing cavity, and two elastic bodies. The two elastic bodies are correspondingly arranged on the axially outer sides of the two driven discs and each elastically abuts against the corresponding driven disc axially. An axial movement guide mechanism is provided between the driven disc and the inner wall of the housing cavity. The driving disc is arranged between the two driven discs. The driven disc device is provided with a through hole for the driving disc shaft to extend from the inner cavity of the housing. At least one of the two axially opposite sides of the driving disc and the adjacent driven disc is provided with a wedge structure. The wedge surface in the wedge structure abuts against the opposite axially opposite side and is configured to push the driven disc to move axially when the driving disc rotates relative to the driven disc.

[0006] In this invention, the active disk rotates and interacts with the driven disk through its wedge structure, generating axial and tangential forces on the driven disk. The tangential force drives the housing to rotate, thus transmitting torque, while the axial force causes the driven disk to compress the elastic body, enabling the driven disk to generate a corresponding axial displacement. When fluctuations occur during the rotation of the active disk, the force on the driven disk in the axial direction changes, resulting in axial movement, thereby providing buffering and vibration reduction.

[0007] In the flexible coupling of the present invention, the housing includes a cylindrical body with a cylindrical inner wall and an end cap. The bottom of the cylindrical body has a baffle for axially abutting against an elastic body. The end cap is fixed to the opening of the cylindrical body and is used for axially abutting against another elastic body.

[0008] In the flexible coupling of the present invention, the driven disc is annular, and its radial side is adapted to the cylindrical surface of the inner cavity of the cylinder. The axial movement guide mechanism includes multiple axial guide grooves disposed on the inner cavity wall of the cylinder and guide teeth disposed on the radial side of the driven disc and adapted to the axial guide grooves.

[0009] In the flexible coupling of the present invention, the elastic body is annular, and both the baffle and the end cover are provided with axial protrusions protruding into the inner cavity of the cylinder, and each elastic body is fitted onto the adjacent axial protrusion.

[0010] In the flexible coupling of the present invention, the axial protrusions on the baffle and the end cover are provided with shaft support holes for supporting the drive disc shaft. Bearings can be installed in the shaft support holes to support the drive disc shaft.

[0011] In the flexible coupling of the present invention, the elastic body is a nonlinear stiffness elastic body, each of the elastic bodies is composed of multiple stacked wave springs, or each of the elastic bodies is composed of an annular rubber pad, or each of the elastic bodies is composed of one or more disc springs.

[0012] In the flexible coupling of the present invention, the wedge structure is arranged in an annular region near the radial edge of the corresponding axial side.

[0013] In the flexible coupling of the present invention, the wedge structure on the axial side includes a plurality of wedge structure units evenly distributed circumferentially within an annular region, and each wedge structure unit contains two wedge surfaces that are mirror-symmetrical to each other.

[0014] In the flexible coupling of the present invention, the wedge structure is provided on both axial sides of the driving disc and the driven disc, and the wedge structure units on the two opposite axial sides are interlocked.

[0015] In the flexible coupling of the present invention, both wedge surfaces in the same wedge surface structural unit are planar.

[0016] Compared with the prior art, the elastic coupling of the present invention converts circumferential impact vibration into axial impact vibration, and uses elastic bodies arranged in the axial direction for buffering and shock absorption. The elastic bodies are arranged in the axial direction, which is less affected by space constraints and facilitates the arrangement of elastic bodies with nonlinear stiffness characteristics, thereby realizing nonlinear torque-angle characteristics. Attached Figure Description

[0017] Figure 1 This is an exploded view of the flexible coupling of the present invention.

[0018] Figure 2 This is a cross-sectional view of the flexible coupling of the present invention.

[0019] Figure 3 This is a side view of the driven disc in the flexible coupling of the present invention.

[0020] Figure 4 This is an axial view of the driven disc in the flexible coupling of the present invention.

[0021] Figure 5 yes Figure 4 A view from direction A.

[0022] Figure 6 This is a side view of the drive disc in the flexible coupling of the present invention.

[0023] Figure 7 This is an axial view of the drive disc in the flexible coupling of the present invention.

[0024] Figure 8 This is a schematic diagram of the structure of the cylinder in the flexible coupling of the present invention.

[0025] Figure 9 This is a schematic diagram of the torque-angle characteristics of a flexible coupling.

[0026] Figure 10 This is a schematic diagram of the engagement between the driving and driven discs of a flexible coupling.

[0027] Component names and serial numbers in the diagram:

[0028] Cylinder 10, axial guide groove 11, first axial protrusion 12, shaft support hole 13, baffle 14.

[0029] End cap 20, second axial protrusion 21.

[0030] Active disk 30, active disk shaft 31, first wedge surface structural unit 32, first wedge surface 33.

[0031] Driven disk 40, guide tooth 41, second wedge structure unit 42, second wedge surface 43.

[0032] Elastomer 50.

[0033] Curve 61 showing the torque-angle characteristic relationship of a nonlinear elastic body, and curve 62 showing the torque-angle characteristic relationship of a coupled linear elastic body. Detailed Implementation

[0034] The specific implementation plan is described below with reference to the attached diagram.

[0035] like Figure 1 As shown in the figure, the flexible coupling in this embodiment includes a driven disc device and a driving disc 30. The driven disc device includes a housing, two driven discs 40 arranged axially within the housing cavity, and two elastic bodies 50. The two elastic bodies 50 are correspondingly arranged on the axially outer sides of the two driven discs 40 and each elastically abuts against the corresponding driven disc 40 axially. An axial movement guide mechanism is provided between the driven disc 40 and the inner wall of the housing cavity. The driving disc 30 is arranged between the two driven discs 40. The driven disc device is provided with a through hole for the driving disc shaft 31 to extend from the inner cavity of the housing. At least one of the two axially opposite sides of the driving disc 30 and the adjacent driven disc 40 is provided with a wedge structure. The wedge surface in the wedge structure abuts against the opposite axially opposite side and is configured to push the driven disc 40 to move axially along the axial movement guide mechanism when the driving disc 30 rotates relative to the driven disc 40.

[0036] Optionally, in this embodiment, the housing includes a cylindrical body 10 with a cylindrical inner wall and an end cap 20. The bottom of the cylindrical body 10 has a baffle 14 for axially abutting against an elastic body 50, and the end cap 20 is fixed to the opening of the cylindrical body 10 and is used for axially abutting against another elastic body 50. Figure 2 As shown, two driven discs 40 are arranged on both sides of the driving disc 30 along the axial direction. One elastic body 50 is arranged between one driven disc 40 and the baffle 14, and the other elastic body 50 is arranged between the other driven disc 40 and the end cover 20.

[0037] In this embodiment, the elastic body 50 is a nonlinear stiffness elastic body, and each elastic body 50 is composed of three stacked annular wave springs. The number of wave springs can be increased or decreased as needed. Optionally, the elastic body 50 can also be composed of an annular rubber pad or one or more disc springs.

[0038] like Figure 2 As shown, the baffle 14 is provided with a first axial protrusion 12 protruding into the inner cavity of the cylinder 10, and an elastic body 50 adjacent to the first axial protrusion 12 is fitted onto the first axial protrusion 12. The end cap 20 is provided with a second axial protrusion 21 protruding into the inner cavity of the cylinder 10, and an elastic body 50 adjacent to the second axial protrusion 21 is fitted onto the second axial protrusion 21.

[0039] A shaft support hole is provided at the center of the first axial protrusion 12, in which a bearing for rotatably connecting with one end of the drive disc shaft 31 can be installed.

[0040] A shaft support hole is provided at the center of the end cover 20. The bearing support hole is a through hole in which a bearing for rotatably connecting with the other end of the drive disc shaft 31 can be installed, and the drive disc shaft can extend out from the shaft support hole.

[0041] like Figure 3 Figure 4 As shown, the driven disk 40 is annular, and its radial side surface is adapted to the cylindrical surface of the inner cavity of the cylinder 10. Figure 8 As shown, the axial movement guide mechanism includes multiple axial guide grooves 11 disposed on the inner wall of the cylinder 10, and guide teeth 41 disposed on the radial side of the driven disk 40 and adapted to the axial guide grooves 11. The guide teeth 41 cooperate with the axial guide grooves 11, enabling the driven disk 40 to move axially relative to the cylinder 10 and to transmit torque.

[0042] like Figure 3 Figure 4 Figure 5 As shown, the driven disk 40 is annular, and a wedge-shaped structure is provided on its axial side facing the driving disk 30. The driven disk 40 has a bearing side facing the elastic body 50 and a plane. The wedge-shaped structure on the driven disk 40 includes several second wedge-shaped structure units 42 that are circumferentially distributed within the annular region. Each second wedge-shaped structure unit 42 contains two mutually mirror-symmetrical second wedge-shaped surfaces 43. The distribution angle corresponding to the second wedge-shaped structure unit 42 is γ, and the second wedge-shaped surface 43 is a plane, with an angle α between it and the radial plane.

[0043] like Figure 6 As shown in Figure 7, the driving disk 30 is disc-shaped, with its center connected to the driving disk shaft 31. Wedge-shaped structures are provided in annular regions near the radial edges on both sides of the driving disk 30's axial sides. The outer diameter of this annular region is D, and the inner diameter is d, which matches the dimensions of the driven disk 40. The wedge-shaped structures on the driving disk 30 include several first wedge-shaped structure units 32 evenly distributed circumferentially within the annular region. Each first wedge-shaped structure unit 32 contains two mutually mirror-symmetrical first wedge-shaped surfaces 33. The central angle corresponding to the first wedge-shaped structure unit 32 is β, and the first wedge-shaped surface 33 is a plane, forming an angle α with the radial plane. The distribution angle of the first wedge-shaped structure units 32 is γ, where β ≤ γ. The second wedge structure unit 42 on the driven disk 40 and the first wedge structure unit 32 on the driving disk 30 are interlocked. That is, when the rotation angle between the driving disk 30 and the driven disk 40 is zero, the two second wedge surfaces 43 in the second wedge structure unit 42 are correspondingly attached to the two first wedge surfaces 33 in the first wedge structure unit 32.

[0044] In this embodiment, the driving disk 30 rotates and interacts with the driven disk 40 through the wedge structure, generating axial and tangential forces on the driven disk 40. The tangential force drives the driven disk 40 and the housing to rotate, thus transmitting torque. The axial force causes the driven disk 40 to compress the elastic body 50, enabling the driven disk 40 to generate a corresponding axial displacement. When fluctuations occur during the rotation of the driving disk 30, the force on the driven disk 40 in the axial direction changes, causing the driven disk 40 to move in the axial direction, thereby playing a role in buffering and vibration reduction.

[0045] In this embodiment, the flexible coupling converts circumferential impact vibration into axial impact vibration through the wedge-shaped structures on the driving disc 30 and the driven disc 40. It then utilizes nonlinear stiffness elastic bodies arranged in the axial direction for buffering and damping. The axial arrangement of these elastic bodies minimizes spatial constraints and facilitates placement, thus achieving the nonlinear torque-angle characteristics of the flexible coupling. The torque-angle characteristic relationship of the flexible coupling is as follows: Figure 9 As shown, in this embodiment, the elastic body is a nonlinear stiffness elastic body, and its torque-rotation angle characteristic curve is curve 61 of the nonlinear elastic body torque-rotation angle characteristic curve, which is relatively smooth and does not have obvious abrupt change points. Correspondingly, the elastic body using multiple linear stiffness elastic bodies such as helical springs for coupling has a torque-rotation angle characteristic curve 62 of the coupled linear elastic body torque-rotation angle characteristic curve, which has obvious abrupt change points and is not easy to smoothly transition.

[0046] like Figure 10 As shown in this embodiment, when the input torque at the driving end of the coupling exceeds the design value (manifested as the relative torsional angle between the driving and driven ends of the coupling exceeding γ / 2), the axial force causes the driven disc 40 to compress the elastic body 50, resulting in a corresponding axial displacement of the driven disc 40 exceeding δ. The first wedge-shaped structural unit 32 in the driving disc 30 will pass over the second wedge-shaped structural unit 42 in the driven disc 40. Before the first wedge-shaped structural unit 32 in the driving disc 30 passes the apex of the second wedge-shaped structural unit 42 in the driven disc 40 and contacts the protruding wedge-shaped unit in the next driven disc 40, the axial and tangential components of the force generated by the interaction between the driving disc and the driven disc through its wedge-shaped structure disappear, and torque transmission is interrupted. If the input torque at the driving end of the coupling continuously exceeds the design value, the raised wedge surface unit in the driving disc 30 will continuously pass over the raised wedge surface unit in the driven disc 40, thereby preventing the output torque of the driven disc from continuously increasing, thus playing an overload protection role and ensuring that the torque load borne by the driven end of the coupling and the equipment connected to the driven end does not exceed a certain value.

Claims

1. A flexible coupling, comprising a driven disc assembly and a driving disc, characterized in that, The driven disk device includes a housing, two driven disks arranged axially within the housing cavity, and two elastic bodies. The two elastic bodies are correspondingly arranged on the outer sides of the two driven disks and each elastically abuts against the corresponding driven disk axially. An axial movement guide mechanism is provided between the driven disks and the inner wall of the housing cavity. The driving disk is arranged between the two driven disks. The driven disk device is provided with a through hole for the driving disk shaft to extend from the inner cavity of the housing. At least one of the two axial sides of the driving disk and the adjacent driven disk is provided with a wedge structure. The wedge surface in the wedge structure abuts against the opposite axial side and is configured to push the driven disk to move axially when the driving disk rotates relative to the driven disk. The elastic body is a nonlinear stiffness elastic body. Each elastic body is composed of multiple stacked wave springs, or each elastic body is composed of an annular rubber pad, or each elastic body is composed of one or more disc springs. The wedge structure is arranged in an annular region near the radial edge on the corresponding axial side surface; The wedge structure on the axial side includes a plurality of wedge structure units evenly distributed circumferentially within the annular region, and each wedge structure unit contains two wedges that are mirror-symmetric to each other. The wedge structure is provided on both opposite axial sides of the driving disk and the driven disk, and the wedge structure units on the two opposite axial sides are interlocked.

2. The flexible coupling according to claim 1, characterized in that, The housing includes a cylindrical body with a cylindrical inner wall and an end cap. The bottom of the cylindrical body has a baffle for axially abutting against an elastic body. The end cap is fixed to the opening of the cylindrical body and is used for axially abutting against another elastic body.

3. The flexible coupling according to claim 2, characterized in that, The driven disk is annular, and its radial side is adapted to the cylindrical surface of the inner cavity of the cylinder. The axial movement guide mechanism includes multiple axial guide grooves disposed on the inner cavity wall of the cylinder and guide teeth disposed on the radial side of the driven disk and adapted to the axial guide grooves.

4. The flexible coupling according to claim 2, characterized in that, The elastomer is annular, and both the baffle and the end cap are provided with axial protrusions that protrude into the inner cavity of the cylinder. Each elastomer is fitted onto an adjacent axial protrusion.

5. The flexible coupling according to claim 4, characterized in that, The axial protrusions on the baffle and end cover are provided with shaft support holes for supporting the drive disc shaft.

6. The flexible coupling according to any one of claims 1 to 5, characterized in that, Both wedge surfaces in the same wedge surface structural unit are planes.

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