Diaphragm structure and flexible coupling

Abstract

The utility model discloses a diaphragm structure and flexible coupling, including diaphragm body, the center hole is provided with at least four positioning holes with the center hole as the center on the diaphragm body circumferentially symmetrical, the diaphragm body has opposite first side and second side, the positioning sleeve that the bolt passes through is fixedly arranged in the positioning hole, the positioning sleeve one end is circular platform structure, the circular platform structure is first boss when on the first side, the circular platform structure is second boss when on the second side, first boss with second boss staggered distribution, and both are along the same circumferential uniform distribution of diaphragm body. Through diaphragm and corresponding shaft sleeve, flange disc between the concentricity alignment except the center hole, realize the secondary concentricity alignment between three in proper order first boss and second boss, and then improve the concentricity of flexible coupling whole.

Description

Technical Field

[0001] This utility model belongs to the technical field of flexible couplings, and relates to a diaphragm structure and a flexible coupling using the diaphragm. Background Technology

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

[0003] Most existing flexible couplings employ a stainless steel diaphragm assembly structure, installed between the flange and the bushing. Working in conjunction with these two components, they transmit torque and are a key component connecting the power source and the main shaft. Utilizing the corrugated deformation of the diaphragm, they effectively compensate for radial and angular misalignments, while also possessing high torsional stiffness and low backlash, meeting the requirements for power transmission efficiency and stability under high-speed transmission conditions.

[0004] However, in practical applications, the concentricity problem between the diaphragm and the flange / sleeve is becoming increasingly prominent. Any deviation in concentricity will cause additional stress distribution in the spindle system, accelerating bearing wear and shortening its service life. Furthermore, it will lead to increased spindle vibration and noise, severely affecting the machining accuracy of the machine tool and reducing the surface quality of the workpiece. Utility Model Content

[0005] The purpose of this utility model is to provide a diaphragm structure and a flexible coupling. By improving the existing diaphragm structure, the concentricity between it and the flange and bushing is improved, thereby improving the concentricity of the flexible coupling.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A diaphragm structure and flexible coupling include a diaphragm body with a central hole at its center and at least four positioning holes symmetrically arranged circumferentially around the central hole. The diaphragm body has opposing first and second sides. Positioning sleeves for bolts to pass through are fixedly installed in the positioning holes. One end of the positioning sleeve is a frustum structure, which is a first boss on the first side and a second boss on the second side. The first and second bosses are staggered and uniformly distributed along the same circumference of the diaphragm body.

[0008] As a further improvement of one embodiment of the present invention, the two ends of the positioning sleeve are fixed to the diaphragm body by positioning rings, and the first boss and the second boss are both exposed outside the positioning rings.

[0009] As a further improvement of one embodiment of the present invention, the positioning sleeve and the diaphragm body are interference-fitted, and the positioning sleeve and the positioning ring are interference-fitted.

[0010] As a further improvement of one embodiment of the present invention, the number of the first protrusion and the second protrusion is the same, and the number is selected from two, three, or four; when there are two first protrusions and two second protrusions, the central angle between adjacent first protrusions is 180°, the central angle between adjacent second protrusions is 180°, and the central angle between adjacent first protrusions and second protrusions in space is 90°; when there are three, the central angle between adjacent first protrusions is 120°, the central angle between adjacent second protrusions is 120°, and the central angle between adjacent first protrusions and second protrusions in space is 60°; when there are four, the central angle between adjacent first protrusions is 90°, the central angle between adjacent second protrusions is 90°, and the central angle between adjacent first protrusions and second protrusions in space is 45°.

[0011] As a further improvement of one embodiment of the present invention, the angle between the slope of the frustum structure and the horizontal plane is between 10° and 80°.

[0012] A flexible coupling includes a spacer and flanges disposed at both ends of the spacer. The outer sides of the flanges are connected to corresponding bushings by bolts, and a diaphragm is provided between the bushings and the flanges. The diaphragm adopts the diaphragm structure described above. The bushings are provided with a first groove for a first boss to be inserted and a second groove for a positioning ring to be placed. The first groove is a frustum structure adapted to the first boss. The flanges are provided with a third groove for a second boss to be inserted and a fourth groove for a positioning ring to be placed. The third groove is a frustum structure adapted to the second boss.

[0013] As a further improvement of one embodiment of the present utility model, the outer side of the bushing has a truncated cone-shaped protrusion, and an outer ring adapted to fit the protrusion is fitted on the protrusion. The outer ring is locked to the bushing by bolts.

[0014] As a further improvement of one embodiment of the present invention, the spacer is a carbon fiber spacer.

[0015] As a further improvement of one embodiment of the present invention, a vertical support is provided at the central hole of the diaphragm, and the vertical support is locked to the bushing by bolts.

[0016] The above technical solution has the following beneficial effects: In addition to the concentricity alignment of the central hole, the first boss and the second boss in sequence achieve secondary concentricity alignment between the diaphragm and the corresponding bushing and flange, thereby improving the overall concentricity of the flexible coupling. Attached Figure Description

[0017] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0018] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0019] Figure 1 A three-dimensional schematic diagram of the diaphragm structure provided by this utility model.

[0020] Figure 2 This is a front view schematic diagram of the diaphragm structure provided by this utility model.

[0021] Figure 3 for Figure 2 A cross-sectional view along the AA direction.

[0022] Figure 4 This is a schematic diagram of the flexible coupling provided by this utility model.

[0023] Figure 5 This utility model provides a three-dimensional schematic diagram of the flange.

[0024] Figure 6 This utility model provides a schematic diagram of the first orientation of the bushing.

[0025] Figure 7 This utility model provides a schematic diagram of the second orientation of the bushing.

[0026] In the picture:

[0027] 1. Diaphragm body; 11. Central hole; 12. First side surface; 13. Second side surface;

[0028] 2. Positioning sleeve; 21. First boss; 22. Second boss;

[0029] 3. Positioning ring;

[0030] 4. Spacer;

[0031] 5. Flange; 51. Third groove; 52. Fourth groove;

[0032] 6. Bushing; 61. First groove; 62. Second groove; 63. Protrusion;

[0033] 7. Outer ring;

[0034] 8. Membrane. Detailed Implementation

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] 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 one of ordinary skill in the art to which this application pertains.

[0037] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model. Example

[0038] See Figures 1-3 As shown, a diaphragm structure includes a diaphragm body 1. A central hole 11 is provided at the center of the diaphragm body 1, and at least four positioning holes are symmetrically arranged circumferentially around the central hole 11. The diaphragm body 1 has opposing first side surfaces 12 and second side surfaces 13. A positioning sleeve 2 for bolts to pass through is fixedly installed in the positioning holes. One end of the positioning sleeve 2 is a frustum structure. For ease of description, the frustum structure on the first side surface 12 is named the first boss 21, and the frustum structure on the second side surface 13 is named the second boss 22. The first boss 21 and the second boss 22 are staggered and uniformly distributed along the same circumferential direction M of the diaphragm body 1. This layout makes the diaphragm more evenly stressed during installation, effectively improving the connection stability between the diaphragm and the bushing / flange. (In this embodiment, the number of positioning holes is six, but the number can be determined according to actual needs, but at least four positioning holes are required so that at least two bolts on the same side can be used for locking.)

[0039] In this embodiment, the diaphragm body 1 and the first protrusion 21 and the second protrusion 22 are usually made of metal materials with certain elasticity and strength, such as stainless steel and spring steel, to ensure that they have sufficient rigidity and flexibility when transmitting torque and compensating for deviations.

[0040] The positioning sleeve 2 is a key component in this structure. It is inserted into the positioning hole and fixed to the diaphragm body 1 by the positioning rings 3 on both sides. The first boss 21 and the second boss 22 are exposed outside the corresponding positioning rings 3, thus playing a guiding role during assembly.

[0041] In practical applications, the diaphragm, through the first boss 21 and the second boss 22, cooperates with the grooves on the bushing and flange, etc., 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 operational stability and reliability of the entire mechanical system.

[0042] In terms of connection method, the positioning sleeve 2 and the diaphragm body 1 adopt an interference fit. This fit ensures that the positioning sleeve 2 is firmly installed on the diaphragm body 1 and will not loosen during equipment operation. Similarly, the positioning sleeve 2 and the positioning ring 3 also adopt an interference fit, so that the positioning ring 3 is tightly connected to the positioning sleeve 2, further enhancing the stability and reliability of the entire diaphragm structure and ensuring that the diaphragm can accurately and stably perform its positioning and power transmission functions in the mechanical system.

[0043] Testing revealed that the concentricity of the first boss 21 and the second boss 22 formed by the aforementioned positioning sleeve 2 is less than 0.02 mm. When assembled with the bushing and flange, the concentricity of the assembly of the three components is also less than 0.03 mm.

[0044] In this embodiment, the first boss 21 and the second boss 22 have the same structure. The angle between the slope (side tilt design) of the truncated cone structure and the horizontal plane is between 10° and 80°, so that it can play a guiding role, making the installation smoother and reducing the installation difficulty.

[0045] The number of the first boss 21 and the second boss 22 is consistent, and the specific number is determined according to the volume of the diaphragm, and can be two, three, four, or other different numbers. This number and layout design is to better achieve precise positioning and stable connection between the diaphragm and the bushing and flange.

[0046] When the number of first protrusions 21 and second protrusions 22 is set to two, from a circumferential distribution perspective, the central angle between adjacent first protrusions 21 is 180°, the central angle between adjacent second protrusions 22 is also 180°, and the spatial central angle between adjacent first protrusions 21 and second protrusions 22 is 90°. This arrangement allows the diaphragm to be subjected to more uniform force during installation, ensuring accurate positioning.

[0047] If the number is set to three, the central angle between adjacent first protrusions 21 becomes 120°, the central angle between adjacent second protrusions 22 is also 120°, and the spatial central angle between adjacent first protrusions 21 and second protrusions 22 is 60°. This layout increases the number of protrusions while still maintaining the stability of the diaphragm structure and the accuracy of its positioning.

[0048] When the number is four, the central angle between adjacent first protrusions 21 is 90°, the central angle between adjacent second protrusions 22 is also 90°, and the spatial central angle between adjacent first protrusions 21 and second protrusions 22 is 45°. Considering equivalent implementations of the mechanical structure, increasing or decreasing the number of protrusions is essentially adjusting the number of circumferential positioning points on the diaphragm. As long as reliable connection and accurate positioning of the diaphragm and related components can be ensured, other reasonable quantities and corresponding angle arrangements are also within the scope of this patent protection.

[0049] Combination Figures 4-7 As shown, a flexible coupling includes a spacer 4 and flanges 5 disposed at both ends of the spacer 4. The spacer 4 and the flanges 5 are fixed together by adhesive. The outer side of the flanges 5 is securely connected to the corresponding bushings 6 by bolts. A diaphragm 8 is carefully arranged between the bushings 6 and the flanges 5. This diaphragm 8 adopts the specific diaphragm structure described above.

[0050] To achieve precise positioning and reliable connection, the bushing 6 is specially provided with a first groove 61 for the first boss 21 to be inserted (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 inserted, 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).

[0051] From the perspective of equivalent implementation methods of mechanical structure, the shape of the groove is not fixed. As long as it can achieve a good fit with the corresponding boss and positioning ring and play a positioning role, other reasonable shapes and structures are within the scope of protection of this patent. For example, the edge of the groove can adopt a rounded corner transition design to reduce stress concentration.

[0052] When the diaphragm 8 with the above structure is installed on the flexible coupling, during the connection with the corresponding bushing 6 and flange 5, in addition to relying on the center hole for concentricity alignment, the first boss 21 and the second boss 22 will sequentially play their roles to achieve secondary concentricity alignment among the three. Simultaneously, the bolts are inserted into the positioning sleeve 2, with the bolt installation direction consistent with the positioning sleeve, and are also installed in a staggered manner. This double alignment method greatly improves the overall concentricity of the flexible coupling, effectively reduces vibration and deviation during operation, enhances the working performance and stability of the coupling, and extends the service life of the equipment.

[0053] In this embodiment, the outer side of the bushing 6 has a truncated cone protrusion 63. The dimensions of the truncated cone protrusion 63 are precisely designed, and its small end diameter, large end diameter, and height are all determined according to the overall specifications of the bushing 6 and the actual usage requirements.

[0054] A matching outer ring 7 is fitted onto the protrusion 63. The inner wall shape of the outer ring 7 fits tightly against the outer surface shape of the protrusion 63 to ensure a stable fit between the two. The outer ring 7 is securely locked onto the bushing 6 with bolts. The specifications and number of bolts are selected according to the actual stress conditions to ensure the reliability and stability of the connection.

[0055] In this embodiment, the spacer 4 is made of carbon fiber material. Carbon fiber has the characteristics of high strength and high modulus, which allows the spacer 4 to maintain high rigidity while greatly reducing its own weight. This is of great significance for improving the overall performance of the flexible coupling and can effectively reduce the energy loss during the operation of the coupling.

[0056] Meanwhile, a vertical support is installed at the center hole of the diaphragm 8, which enhances the structural stability of the diaphragm 8. It is bolted to the bushing 6, and the bolt tightening force must be controlled within a suitable range to ensure a secure connection between the vertical support and the bushing 6 while avoiding damage to the diaphragm 8 and bushing 6 due to excessive tightening force. This design allows the diaphragm 8 to operate more stably and reliably when transmitting torque and compensating for deviations, further improving the overall performance of the flexible coupling.

[0057] When the above-mentioned flexible coupling is subjected to dynamic balancing test, when the dynamic balancing speed reaches 3000 RPM, the left unbalance is 0.12g and the right unbalance is 0.1g, and the dynamic balance level reaches G2.5, which meets the usage requirements of the spindle system.

[0058] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0059] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0060] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0061] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A diaphragm structure comprising a diaphragm body, a center hole being provided at the center of the diaphragm body, at least four positioning holes being provided on the diaphragm body in a circumferential symmetry with the center hole as the center; characterized in that, The diaphragm body has opposite first and second sides, the positioning hole is internally fixed with a positioning sleeve through which a bolt passes, the positioning sleeve has a frustum structure at one end, the frustum structure is a first boss on the first side, the frustum structure is a second boss on the second side, the first boss and the second boss are staggered and uniformly distributed along the same circumference of the diaphragm body.

2. The membrane structure of claim 1, wherein, Both ends of the positioning sleeve are fixed on the diaphragm body by a positioning ring, and the first boss and the second boss are exposed outside the positioning ring.

3. The membrane structure of claim 2, wherein, The positioning sleeve and the diaphragm body are in interference fit, and the positioning sleeve and the positioning ring are in interference fit.

4. The diaphragm structure of claim 3, wherein, 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 between adjacent first bosses and second bosses in space 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 between adjacent first bosses and second bosses in space 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 between adjacent first bosses and second bosses in space is 45°.

5. The diaphragm structure of claim 4, wherein, 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 flange plates provided at both ends of the spacer, the flange plates being connected to corresponding shaft sleeves by means of bolts on the outside, and a diaphragm being provided between the shaft sleeves and the flange plates, characterized in that, The diaphragm adopts the diaphragm structure of any one of claims 1-5, the shaft sleeve is provided with a first groove for embedding the first boss and a second groove for placing the positioning ring, and the first groove is a frustum structure matched with the first boss; the flange plate is provided with a third groove for embedding the second boss and a fourth groove for placing the positioning ring, and the third groove is a frustum structure matched with the second boss.

7. The flexible coupling of claim 6 wherein, The outer side of the shaft sleeve has a protrusion with a frustum structure, an outer ring matched with the protrusion is sleeved on the protrusion, and the outer ring is locked on the shaft sleeve by a bolt.

8. The flexible coupling of claim 6 wherein, The spacer is a carbon fiber spacer.

9. The flexible coupling of claim 6 wherein, The diaphragm is provided with a vertical support at the center hole, and the vertical support is locked on the shaft sleeve by a bolt.

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