Diaphragm structure and flexible coupling

Abstract

The diaphragm structure comprises a diaphragm body, a center hole is formed in the center of the diaphragm body, and at least four positioning holes are symmetrically formed in the diaphragm body in the circumferential direction with the center hole as the circle center; the diaphragm body is provided with a first side face and a second side face which are opposite to each other, a positioning sleeve for a bolt to penetrate through is fixedly arranged in the positioning hole, one end of the positioning sleeve is of a circular truncated cone structure, the circular truncated cone structure is a first boss when on the first side face, and the circular truncated cone structure is a second boss when on the second side face. The first bosses and the second bosses are distributed in a staggered mode and are evenly distributed in the same circumferential direction of the diaphragm body. Except for the concentricity alignment of the central hole between the diaphragm and the corresponding shaft sleeve as well as between the diaphragm and the corresponding flange plate, the secondary concentricity alignment among the diaphragm, the corresponding shaft sleeve and the corresponding flange plate is realized by the first boss and the second boss in sequence, so that the overall concentricity of the flexible coupling is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of flexible couplings and relates to a diaphragm structure and a flexible coupling using the diaphragm. Background Art

[0002] In high-speed spindle systems, the machining accuracy and operational reliability of machine tools are highly dependent on the coordinated performance of various components. Flexible couplings, as the "flexible joints", play a vital role.

[0003] Existing flexible couplings mostly utilize a stainless steel diaphragm assembly, installed between a flange and a sleeve. Working together to transmit torque, they are key components connecting the power source to the main shaft. The diaphragm's corrugated deformation effectively compensates for radial and angular misalignment, while simultaneously offering high torsional stiffness and low backlash, meeting the requirements for efficient and stable power transmission under high-speed transmission conditions.

[0004] However, in practical applications, concentricity issues between the diaphragm, flange, and sleeve are becoming increasingly prominent. Concentricity deviations can lead to additional stress distribution within the spindle system, exacerbating bearing wear and shortening its service life. Furthermore, these deviations can cause increased spindle vibration and noise, severely impacting machine tool precision and reducing workpiece surface quality. Summary of the Invention

[0005] The object of the present invention is to provide a diaphragm structure and a flexible coupling, by improving the existing diaphragm structure, improving the concentricity between the diaphragm structure and the flange and the sleeve, and thus improving the concentricity of the flexible coupling.

[0006] The purpose of the present invention is achieved through the following technical solutions: A diaphragm structure and a flexible coupling include a diaphragm body, a center hole is provided at the center of the diaphragm body, and at least four positioning holes are symmetrically provided on the diaphragm body in a circumferential direction with the center hole as the center; the diaphragm body has a first side surface and a second side surface opposite to each other, a positioning sleeve for a bolt to pass through is fixedly provided in the positioning hole, one end of the positioning sleeve is a frustum structure, the frustum structure is a first boss when on the first side surface, and is a second boss when on the second side surface, the first boss and the second boss are staggered, and both are evenly distributed along the same circumference of the diaphragm body.

[0007] As a further improvement of an embodiment of the present invention, both ends of the positioning sleeve are fixed to the diaphragm body through positioning rings, and the first boss and the second boss are both exposed outside the positioning rings.

[0008] As a further improvement of an embodiment of the present invention, the positioning sleeve and the diaphragm body are interference fit, and the positioning sleeve and the positioning ring are interference fit.

[0009] As a further improvement of one embodiment of the present invention, the number of the first bosses and the second bosses is the same, and the number is selected from two, three, and four; when the number of the first bosses and the second bosses is two, the central angle between adjacent first bosses is 180°, the central angle between adjacent second bosses is 180°, and the central angle in space between adjacent first bosses and second bosses is 90°; when the number is three, the central angle between adjacent first bosses is 120°, the central angle between adjacent second bosses is 120°, and the central angle in space between adjacent first bosses and second bosses is 60°; when the number is four, the central angle between adjacent first bosses is 90°, the central angle between adjacent second bosses is 90°, and the central angle in space between adjacent first bosses and second bosses is 45°.

[0010] As a further improvement of an embodiment of the present invention, the angle between the slope of the frustum structure and the horizontal plane is between 10° and 80°.

[0011] A flexible coupling comprises a spacer and flanges arranged at both ends of the spacer, the outer side of the flange being connected to the corresponding sleeve by means of bolts, and a diaphragm being provided between the sleeve and the flange, the diaphragm adopting the diaphragm structure of the above-mentioned structure, the sleeve being provided with a first groove for embedding the first boss and a second groove for placing the positioning ring, the first groove being a frustum structure adapted to the first boss; the flange being provided with a third groove for embedding the second boss and a fourth groove for placing the positioning ring, the third groove being a frustum structure adapted to the second boss.

[0012] As a further improvement of an embodiment of the present invention, the outer side of the sleeve has a protrusion with a truncated cone structure, and an outer ring adapted to the protrusion is sleeved on the protrusion, and the outer ring is locked on the sleeve by bolts.

[0013] As a further improvement of an embodiment of the present invention, the spacer is a carbon fiber spacer.

[0014] As a further improvement of an embodiment of the present invention, a vertical support member is provided at the center hole of the diaphragm, and the vertical support member is fixed to the shaft sleeve by bolts.

[0015] The above technical solution has the following beneficial effects: in addition to the concentricity alignment of the center hole between the diaphragm and the corresponding sleeve and flange, the first boss and the second boss realize secondary concentricity alignment among the three, thereby improving the overall concentricity of the flexible coupling. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0017] The structures, proportions, sizes, etc. illustrated in this specification are intended only to complement the contents disclosed herein and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in sizes, without affecting the efficacy and objectives of the present invention, shall still fall within the scope of the technical contents disclosed herein.

[0018] Figure 1 This is a three-dimensional schematic diagram of the diaphragm structure provided by the present invention.

[0019] Figure 2 This is a schematic front view of the diaphragm structure provided by the present invention.

[0020] Figure 3 for Figure 2 Schematic cross-sectional view along the AA direction.

[0021] Figure 4 This is a schematic structural diagram of the flexible coupling provided by the present invention.

[0022] Figure 5 This is a three-dimensional schematic diagram of the flange provided by the present invention.

[0023] Figure 6 This is a schematic diagram of the first orientation of the shaft sleeve provided by the present invention.

[0024] Figure 7 This is a schematic diagram of the second orientation of the shaft sleeve provided by the present invention.

[0025] In the picture: 1. Diaphragm body; 11. Center hole; 12. First side surface; 13. Second side surface; 2. Positioning sleeve; 21. First boss; 22. Second boss; 3. Positioning ring; 4. Spacer; 5. Flange; 51. Third groove; 52. Fourth groove; 6. Bushing; 61. First groove; 62. Second groove; 63. Protrusion; 7. Outer ring; 8. Diaphragm. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0028] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention. Example

[0029] See also Figure 1-Figure 3 As shown, a diaphragm structure includes a diaphragm body 1 having a center hole 11 at its center. At least four positioning holes are symmetrically arranged circumferentially around the diaphragm body 1, centered around the center hole 11. The diaphragm body 1 has opposing first and second side surfaces 12 and 13. A positioning sleeve 2 is fixedly mounted within the positioning hole, through which a bolt passes. One end of the positioning sleeve 2 is a frustum. For ease of description, the frustum on the first side 12 is referred to as the first boss 21, and the frustum on the second side 13 is referred to as the second boss 22. The first boss 21 and the second boss 22 are staggered and evenly distributed along the same circumferential direction M of the diaphragm body 1. This arrangement ensures more uniform force distribution during installation, effectively improving the connection stability between the diaphragm, the shaft sleeve, and the flange. (In this embodiment, there are six positioning holes; this number can be determined based on actual needs, but at least four are required to ensure at least two bolts can be used for locking on the same side.)

[0030] In this embodiment, the diaphragm body 1 and the first and second bosses 21 and 22 are generally made of metal materials with certain elasticity and strength, such as stainless steel, spring steel, etc., to ensure sufficient rigidity and flexibility when transmitting torque and compensating deviation.

[0031] The positioning sleeve 2 is a key component in the structure. It is inserted into the positioning hole and fixed to the diaphragm body 1 through the positioning rings 3 on both sides. The first boss 21 and the second boss 22 are exposed outside the corresponding positioning rings 3, thereby playing a guiding role during assembly.

[0032] In actual applications, the diaphragm cooperates with the shaft sleeve, the grooves on the flange and other structures through the first boss 21 and the second boss 22, which not only enables accurate installation, but also effectively compensates for axial, radial and angular deviations during equipment operation, reduces vibration and noise, and improves the operating stability and reliability of the entire mechanical system.

[0033] The positioning sleeve 2 and diaphragm body 1 utilize an interference fit, ensuring they are securely mounted on the diaphragm body 1 and preventing them from loosening during operation. Similarly, the positioning sleeve 2 and positioning ring 3 utilize an interference fit, tightly connecting them. This further enhances the stability and reliability of the entire diaphragm structure, ensuring the diaphragm can accurately and stably perform its functions of positioning and transmitting power within the mechanical system.

[0034] Testing has shown that the concentricity of the first and second bosses 21, 22 formed by the positioning sleeve 2 is less than 0.02 mm. When assembled with the shaft sleeve and flange, the concentricity of the three components is also less than 0.03 mm.

[0035] In this embodiment, the first boss 21 and the second boss 22 have the same structure, and the angle between the slope of the cone structure (side tilt design) and the horizontal plane is between 10° and 80°, so that it can play a guiding role, making the installation smoother and reducing the difficulty of installation.

[0036] The number of the first bosses 21 and the second bosses 22 is the same, and the specific number is determined by the volume of the diaphragm, and can be two, three, four, etc. This number and layout design is designed to better achieve precise positioning and stable connection between the diaphragm, the sleeve, and the flange.

[0037] When the number of first and second bosses 21 and 22 is set to two, the central angle between adjacent first bosses 21 is 180°, the central angle between adjacent second bosses 22 is also 180°, and the central angle between adjacent first and second bosses 21 and 22 is 90°. This layout ensures more uniform force on the diaphragm during installation and ensures accurate positioning.

[0038] If three are selected, the central angle between adjacent first bosses 21 becomes 120°, the central angle between adjacent second bosses 22 is also 120°, and the spatial central angle between adjacent first bosses 21 and second bosses 22 is 60°. This layout increases the number of bosses while still maintaining the stability of the diaphragm structure and the accuracy of positioning.

[0039] When there are four bosses, the central angle between adjacent first bosses 21 is 90°, the central angle between adjacent second bosses 22 is also 90°, and the spatial central angle between adjacent first bosses 21 and second bosses 22 is 45°. Considering the equivalent implementation of the mechanical structure, increasing or decreasing the number of bosses is essentially adjusting the number of circumferential positioning points of the diaphragm. As long as the diaphragm can be reliably connected and accurately positioned with related components, other reasonable numbers and corresponding angle layouts are also within the scope of protection of this patent.

[0040] Combine Figure 4-Figure 7 The figure shows a flexible coupling comprising a spacer 4 and flanges 5 at both ends of the spacer 4. The spacer 4 and flanges 5 are fixed together by adhesive. The outer sides of the flanges 5 are securely connected to corresponding sleeves 6 by bolts. A diaphragm 8 is carefully placed between the sleeves 6 and the flanges 5. This diaphragm 8 adopts the specific diaphragm structure described above.

[0041] In order to achieve precise positioning and reliable connection, the sleeve 6 is specially provided with a first groove 61 for the first boss 21 to be embedded (the first groove 61 is a frustum structure adapted to the first boss 21), and a second groove 62 for the positioning ring 3 to be placed; the flange 5 is correspondingly provided with a third groove 51 for the second boss 22 to be embedded, and a fourth groove 52 for the positioning ring 3 to be placed (the third groove 51 is a frustum structure adapted to the second boss 22).

[0042] From the perspective of mechanically equivalent implementations, the shape of the groove is not fixed. As long as it can effectively cooperate with the corresponding boss and locating ring to achieve positioning, other reasonable shapes and structures are within the scope of protection of this patent. For example, the edges of the groove can adopt a rounded transition design to reduce stress concentration.

[0043] When the diaphragm 8, employing the aforementioned structure, is installed in the flexible coupling, during connection with the corresponding sleeve 6 and flange 5, in addition to achieving concentric alignment through the center hole, the first and second bosses 21 and 22 function sequentially to achieve secondary concentric alignment between the three. Furthermore, the bolts, threaded through the positioning sleeve 2, are installed in the same direction as the positioning sleeve and also staggered. This dual alignment significantly improves the overall concentricity of the flexible coupling, effectively reducing vibration and deviation during operation, enhancing the coupling's performance and stability, and extending the equipment's service life.

[0044] In this embodiment, the outer side of the sleeve 6 has a truncated cone structure protrusion 63. The size of the truncated cone structure protrusion 63 is precisely designed, and its parameters such as the small end diameter, large end diameter and height are determined based on the overall specifications of the sleeve 6 and actual usage requirements.

[0045] A matching outer ring 7 is fitted over protrusion 63. The inner wall of outer ring 7 closely matches the outer surface of protrusion 63, ensuring a stable fit. Outer ring 7 is securely fastened to sleeve 6 via bolts. The size and number of bolts are selected based on the actual load conditions to ensure a reliable and stable connection.

[0046] In this embodiment, the spacer 4 is made of carbon fiber material. Carbon fiber has the characteristics of high strength and high modulus, so that the spacer 4 can greatly reduce its own weight while ensuring high rigidity. This is of great significance to the improvement of the overall performance of the flexible coupling and can effectively reduce the energy loss during the operation of the coupling.

[0047] Furthermore, a vertical support is provided at the center hole of diaphragm 8, enhancing its structural stability. It is bolted to sleeve 6 via bolts. The tightening force of the bolts must be controlled within an appropriate range to ensure a secure connection between the vertical support and sleeve 6 while avoiding damage to diaphragm 8 and sleeve 6 due to excessive tightening force. This design ensures more stable and reliable operation of diaphragm 8 when transmitting torque and compensating for misalignment, further enhancing the overall performance of the flexible coupling.

[0048] When the above-mentioned flexible coupling is subjected to dynamic balancing test, when the dynamic balancing speed reaches 3000RPM, the left imbalance is 0.12g, the right imbalance is 0.1g, and the dynamic balancing grade reaches G2.5, which meets the use requirements of the spindle system.

[0049] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0050] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0051] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0052] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A diaphragm structure comprising a diaphragm body, wherein a central hole is provided at the center of the diaphragm body, and at least four positioning holes are symmetrically provided on the diaphragm body with the central hole as the center; characterized in that: The diaphragm body has a first side surface and a second side surface that are opposite to each other. A positioning sleeve for a bolt to pass through is fixedly arranged in the positioning hole. One end of the positioning sleeve is a frustum structure. The frustum structure is a first boss when on the first side surface, and is a second boss when on the second side surface. The first boss and the second boss are staggered and both are evenly distributed along the same circumference of the diaphragm body.

2. The diaphragm structure according to claim 1, characterized in that Both ends of the positioning sleeve are fixed to the diaphragm body through positioning rings, and the first boss and the second boss are both exposed outside the positioning rings.

3. The diaphragm structure according to claim 2, characterized in that: The positioning sleeve and the diaphragm body are interference fit, and the positioning sleeve and the positioning ring are interference fit.

4. The diaphragm structure according to claim 3, characterized in that: The number of the first bosses and the second bosses is the same, and the number is selected from two, three, and four; when the number of the first bosses and the second bosses is two, the central angle between adjacent first bosses is 180°, the central angle between adjacent second bosses is 180°, and the central angle in space between adjacent first bosses and second bosses is 90°; when the number is three, the central angle between adjacent first bosses is 120°, the central angle between adjacent second bosses is 120°, and the central angle in space between adjacent first bosses and second bosses is 60°; when the number is four, the central angle between adjacent first bosses is 90°, the central angle between adjacent second bosses is 90°, and the central angle in space between adjacent first bosses and second bosses is 45°.

5. The diaphragm structure according to claim 4, characterized in that: The angle between the slope of the frustum structure and the horizontal plane is between 10° and 80°.

6. A flexible coupling comprising a spacer and flanges provided at both ends of the spacer, wherein the outer sides of the flanges are connected to corresponding sleeves by bolts, and a diaphragm is provided between the sleeves and the flanges, characterized in that: The diaphragm adopts the diaphragm structure of any one of claims 1 to 5, and the sleeve is provided with a first groove for the first boss to be embedded and a second groove for the positioning ring to be placed, and the first groove is a frustum structure adapted to the first boss; the flange is provided with a third groove for the second boss to be embedded and a fourth groove for the positioning ring to be placed, and the third groove is a frustum structure adapted to the second boss.

7. The diaphragm structure according to claim 6, characterized in that: The outer side of the shaft sleeve is provided with a truncated cone-shaped protrusion, and an outer ring adapted to the protrusion is sleeved on the protrusion, and the outer ring is fixed to the shaft sleeve by bolts.

8. The diaphragm structure according to claim 6, characterized in that: The spacer is a carbon fiber spacer.

9. The diaphragm structure according to claim 6, characterized in that: A vertical support member is provided at the center hole of the diaphragm, and the vertical support member is fixed on the shaft sleeve by bolts.

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