A shock-absorbing sleeve with a groove structure and a double diaphragm coupling including the same.

Abstract

This application relates to the field of mechanical transmission technology. This application proposes a damping sleeve with a grooved structure and a double-diaphragm coupling including the same. The damping sleeve is cylindrical, and its outer surface has a circumferentially extending groove structure, including a main groove and a micro-textured secondary groove disposed on the main groove. The double-diaphragm coupling includes two half-couplings, two sets of diaphragms, and an intermediate spacer. The half-couplings are located at both ends of the intermediate spacer, and the diaphragm sets are respectively disposed between the half-couplings and the intermediate spacer, and connected by bolts. A damping sleeve with a grooved structure is disposed between the flange holes of the half-couplings and the intermediate spacer and the bolts. By setting the grooved structure, this application achieves synergistic enhancement of the damping sleeve's flexible control and heat dissipation, thereby dispersing bolt loads, reducing stress concentration and local temperature rise, improving the uniformity of stress on the diaphragm sets and the thermal stability of the connection parts, and thus improving the fatigue life and long-term operational reliability of the double-diaphragm coupling.

Description

Technical Field

[0001] This application relates to the field of mechanical transmission technology, and more specifically, to a shock-absorbing sleeve with a groove structure and a double diaphragm coupling including the same. Background Technology

[0002] A double diaphragm coupling is a flexible coupling device used in high-speed, high-precision mechanical transmission systems. It typically consists of two sets of diaphragms, an intermediate spacer, and end coupling halves. Through the elastic deformation of the diaphragms, the double diaphragm coupling can compensate for minor misalignments between shafts while transmitting torque. Due to periodic torque fluctuations and shaft misalignments during operation, the diaphragms need to withstand complex alternating stresses over long periods, making fatigue life a major factor affecting the reliability of the double diaphragm coupling.

[0003] To reduce the direct transmission of impact loads to the diaphragm, damping sleeves are typically installed between the bolts and flange holes in engineering projects to introduce a certain degree of elastic buffering at the connection. Existing damping sleeves are mostly smooth cylindrical structures with limited deformation space in the radial and tangential directions, resulting in high overall stiffness. When the double diaphragm coupling is under eccentric loading or high-speed variable load conditions, the elastic energy absorption effect of the damping sleeve is limited, and the impact energy is still mainly transmitted directly to the diaphragm through the bolts, making it difficult to effectively reduce stress peaks. Furthermore, the damping sleeve is enclosed by the flange hole during operation, with a very small gap between the outer surface and the flange hole wall, resulting in a narrow heat dissipation channel. Under high-frequency shear or alternating stress conditions, the heat generated inside is difficult to dissipate in time, leading to localized temperature rise and material performance degradation. The combined effect of heat accumulation and stress concentration makes the diaphragm hole edge area prone to fatigue cracks, shortening its service life and affecting the long-term operational stability of the double diaphragm coupling. Therefore, it is evident that existing damping sleeve structures are insufficient in both buffering and energy absorption capacity and heat dissipation performance, failing to achieve a balance between flexible response and structural strength.

[0004] Therefore, it is necessary to propose a shock-absorbing sleeve with controllable flexibility and efficient heat dissipation in structure, so that it can have better energy absorption and thermal stability while ensuring connection stiffness and structural stability. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the prior art by providing a shock-absorbing sleeve with a groove structure and a double diaphragm coupling including the same, so as to solve the problem of insufficient buffering and heat dissipation performance of the shock-absorbing sleeve in the prior art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] This application provides a shock-absorbing sleeve with a groove structure. The shock-absorbing sleeve is cylindrical and its outer surface is provided with a groove structure extending in the circumferential direction. The groove structure includes a main groove and a micro-textured secondary groove disposed on the main groove.

[0008] This application utilizes a circumferentially extending groove structure on the outer surface of the damping sleeve to create a periodic flexible zone in the radial direction. The portion between the grooves serves as a support zone, collectively forming a circumferential elastic system with controllable stiffness. When the bolt is subjected to micro-displacement or impact load, the groove structure generates recoverable micro-deformation in the radial and tangential directions, thereby dispersing local stress and weakening the stress transmission path. The micro-textured sub-grooves formed on the main groove further expand the local contact area, enhancing the energy dissipation effect of interfacial friction. Simultaneously, they form micro-flow channels under high-frequency shearing, helping to reduce the temperature rise of the contact surface. Thus, the synergistic effect of the main groove and the micro-textured sub-grooves enables the damping sleeve to achieve a balance between flexibility adjustment and heat dissipation performance while maintaining basic structural stability. This improves the buffering characteristics and thermal stability of the connection interface and reduces the direct load transfer to the diaphragm during damping.

[0009] Furthermore, the main groove is a spiral groove that runs axially through both ends of the damping sleeve. The continuous distribution of the spiral grooves creates a flexible channel that coordinates with the damping sleeve in both the axial and radial directions, resulting in smooth torsional deformation under load, thereby dispersing the stress transmitted along the axial direction. The continuous spiral grooves also form airflow channels, improving the heat dissipation capacity of the damping sleeve.

[0010] Furthermore, the main groove is an annular groove, with its annular surface perpendicular to the axis of the damping sleeve. The annular groove forms a circumferential flexible band in the radial direction, generating radial deformation to withstand transient loads, reducing local impacts and maintaining the overall structural stability.

[0011] Furthermore, the annular grooves are discontinuously distributed. The discontinuous annular grooves maintain the overall strength of the damping sleeve while forming discrete flexible zones, enabling multi-point deformation and stress dispersion under load, thus avoiding structural weakening caused by continuous grooves.

[0012] Furthermore, micro-textured sub-grooves are set on the bottom or wall of the main groove, and they have a dot matrix, corrugated, or ridge-like structure. The micro-textured sub-grooves increase the surface area of ​​the main groove, improve the frictional energy dissipation conditions at the interface, and promote heat conduction and dissipation under high-frequency shearing action, thereby improving the overall energy dissipation and thermal stability characteristics of the shock absorber.

[0013] Furthermore, the materials for the shock-absorbing sleeves are polyurethane, thermoplastic polyester elastomer, silicone rubber, or fluororubber.

[0014] This application also proposes a double diaphragm coupling, comprising two half couplings, two sets of diaphragms, and an intermediate spacer. The half couplings are located at both ends of the intermediate spacer, and the diaphragm sets are respectively disposed between the half couplings and the intermediate spacer and connected by bolts. A damping sleeve with a groove structure is provided between the flange holes of the half couplings and the intermediate spacer and the bolts.

[0015] This application utilizes a grooved damping sleeve between the flange holes and bolts of the half-coupling and intermediate spacer of a double diaphragm coupling to create an adjustable-flexibility isolation layer at the bolt connection interface. During operation, the double diaphragm coupling experiences axial, radial, or angular micro-displacements due to manufacturing errors or assembly deviations when transmitting torque, causing periodic changes in bolt stress. The damping sleeve, with its grooved structure, generates controllable elastic deformation, absorbing and dispersing transient impact loads transmitted by the bolts, and reducing the direct transmission of load peaks along the bolt-to-diaphragm path. The micro-textured grooves enhance interfacial frictional energy dissipation under shear stress, while simultaneously promoting heat conduction and dissipation at the contact surface, maintaining stable mechanical properties of the damping sleeve under high-frequency variable load conditions. Through these structural effects, the stress distribution of the diaphragm assembly tends to be uniform during operation, stress concentration is alleviated, thereby delaying the accumulation of fatigue damage and improving the service life and operational stability of the double diaphragm coupling.

[0016] Furthermore, it also includes an anti-loosening structure, which is located at the limiting end of the bolt. The anti-loosening structure includes an anti-loosening washer, locking thread, or thread-locking adhesive. The anti-loosening structure provides additional limiting when the bolt is subjected to vibration or load impact, preventing the threads from loosening and maintaining the bolt preload and the stability of the diaphragm assembly installation.

[0017] Furthermore, the bolt holes of the diaphragm assembly are teardrop-shaped, with the larger round end facing the inner diameter side of the diaphragm assembly and the pointed end facing the outer diameter side. The geometry of the teardrop-shaped hole allows the stress at the hole edge to gradually transition radially when the diaphragm assembly is subjected to tensile or bending deformation. The larger round end shares the axial stress, while the pointed end guides radial deformation, thereby reducing stress concentration in the bolt hole area and improving the stress distribution of the diaphragm assembly.

[0018] Furthermore, the inner wall of the flange hole is provided with heat dissipation grooves along the axial direction. When the coupling rotates at high speed, the heat dissipation grooves form axial flow channels, allowing frictional heat to be carried away by airflow or oil flow, reducing local temperature rise and maintaining the thermal stability of the connection.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] (1) This application forms a main groove extending circumferentially and a secondary groove with micro-texture on the outer surface of the damping sleeve, enabling the damping sleeve to simultaneously possess flexibility adjustment and thermal conductivity capabilities. Compared to traditional smooth cylindrical damping sleeves, this structure can more fully release deformation space and disperse stress concentration points under load, resulting in a smoother and more stable damping response; at the same time, the heat dissipation channels formed between the groove walls improve local heat accumulation and ensure long-term stability of material properties. Through the above improvements, the damping sleeve can weaken the transmission intensity of impact loads under long-term alternating loads, reduce the impact on the diaphragm assembly, and provide structural support for improving the overall fatigue life of the coupling.

[0021] (2) In this application, a damping sleeve with a groove structure is set in the double diaphragm coupling to form an elastic isolation layer between the flange hole and the bolt, so as to absorb and attenuate the impact load caused by the sudden torque change, reduce the stress concentration transmission along the bolt to the diaphragm group, make the diaphragm more uniformly stressed, reduce the formation of fatigue cracks, thereby extending the service life of the double diaphragm coupling and improving the smoothness of operation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a shock-absorbing sleeve with a groove structure provided by the present invention;

[0023] Figure 2 A schematic diagram of a double diaphragm coupling including a shock-absorbing sleeve with a groove structure provided by the present invention;

[0024] Figure 3 This is a cross-sectional schematic diagram of a double diaphragm coupling including a shock-absorbing sleeve with a groove structure, provided by the present invention.

[0025] Icons: 1-Shock-absorbing sleeve; 2-Main groove; 3-Secondary groove; 4-Half coupling; 5-Diaphragm assembly; 6-Intermediate spacer sleeve; 7-Bolt; 8-Shim. Detailed Implementation

[0026] To make the implementation process of this invention clearer, a detailed description will be provided below in conjunction with the accompanying drawings.

[0027] Example 1:

[0028] This invention provides a shock-absorbing sleeve with a groove structure, such as Figure 1 As shown, the shock-absorbing sleeve 1 is cylindrical, and its outer surface is provided with a groove structure extending in the circumferential direction. The groove structure includes a main groove 2 and a micro-textured secondary groove 3 provided on the main groove 2.

[0029] The damping sleeve 1 is a cylindrical hollow structure, fitted onto the outside of the bolt 7 of the coupling and embedded in the flange hole. The damping sleeve 1 is preferably made of an elastomer material with high elasticity and heat resistance, with a Shore A hardness preferably of 70-90, such as polyurethane, thermoplastic polyester elastomer (TPEE), silicone rubber, or fluororubber, to balance flexibility, fatigue resistance, and long-term operational stability. The outer diameter of the damping sleeve 1 is slightly smaller than the inner diameter of the flange hole, creating a controllable micro-gap between the outer wall of the bolt and the inner wall of the flange hole after assembly. This compensates for minor radial or axial misalignments during coupling operation, reducing assembly stress and operational vibration. Its axial length is slightly greater than the flange thickness, allowing one end to contact the diaphragm assembly 5 during assembly, thus providing isolation and preventing fatigue damage caused by direct friction or contact between the diaphragm and the flange surface.

[0030] When only a smooth cylindrical damping sleeve 1 is used, the recoverable deformation space of the damping sleeve 1 in the radial and tangential directions is relatively limited, making it difficult to effectively disperse the transient peak value of the bolt 7 load. At the same time, due to the narrow heat dissipation channel under the flange hole covering condition, long-term high-frequency shearing easily leads to local temperature rise, thereby aggravating the stress concentration in the hole area of ​​the diaphragm group 5 and causing fatigue damage. To improve the above shortcomings, this embodiment provides a groove structure extending circumferentially on the outer surface of the damping sleeve 1. The groove structure includes a main groove 2 for providing the main flexibility and deformation space, and a micro-textured secondary groove 3 formed on the main groove 2 for adjusting the interfacial friction and thermal conductivity characteristics. The main groove 2 extends along the circumference of the damping sleeve 1, and its groove width is preferably 5%-10% of the outer diameter of the damping sleeve 1, and its groove depth is 10%-20% of the wall thickness. The bottom of the groove adopts an arc or trapezoidal transition structure to avoid stress concentration. The setting of the main groove 2 makes the damping sleeve 1 form a periodic flexible zone in the radial direction, which can generate controllable elastic deformation under load, thereby dispersing the bolt 7 load and reducing the local impact effect. Microtextured sub-grooves 3 are distributed on the bottom or walls of the main groove 2, or can be arranged on all surfaces. They are made by processes such as mold embossing, laser etching, or micro-milling. The presence of sub-grooves 3 increases the actual contact surface area of ​​the main groove 2, causing a slight slippage at the interface under shear load and realizing frictional energy dissipation. At the same time, microscale heat conduction and flow channels are formed at the groove walls, which is conducive to heat diffusion and interface heat dissipation. Through the synergistic design of the main groove 2 and the microtextured sub-grooves 3, the damping sleeve 1 achieves controllable flexibility and efficient heat dissipation performance without weakening the overall structural strength: on the one hand, it can buffer and reduce the peak load of bolt 7, reduce the concentrated effect of load along the transmission path to the edge of the diaphragm hole, thereby improving the stress uniformity of the diaphragm assembly 5; on the other hand, it improves the energy dissipation and thermal stability of the damping sleeve 1 itself, suppresses local temperature rise and material performance degradation, and ultimately delays fatigue damage of the diaphragm assembly 5 and extends its service life.

[0031] The main groove 2 of the shock absorber sleeve 1 is preferably a spiral groove or an annular groove, selected according to the application conditions and the requirements for flexibility and heat dissipation performance. In this embodiment, the main groove 2 adopts an annular groove structure, with its annular surface perpendicular to the axis of the shock absorber sleeve 1, and 3-8 annular grooves distributed along the axial direction. The axial spacing between adjacent annular grooves is preferably 2-3 times the groove width to achieve a balance between flexibility and strength. The number of annular grooves is preferably 3-8. When the number of grooves is less than 3, the flexibility is insufficient, making it difficult to distribute the load and absorb impact energy; when the number of grooves exceeds 8, the cross-section of the connecting band decreases, the overall stiffness decreases, and the processing difficulty increases. Each annular groove is discontinuously distributed in the circumferential direction, consisting of multiple groove segments arranged at intervals along the circumferential direction. An ungrooved connecting band is retained between adjacent groove segments to maintain the overall strength and structural continuity of the shock absorber sleeve 1 and prevent the formation of a continuous circumferential weakening band. The groove ends are provided with rounded corners or small chamfers to avoid local stress peaks and processing burrs at the groove opening. To avoid the formation of a continuous weakening zone by the discontinuous groove segments of adjacent annular grooves in the axial direction, the main groove 2 preferably adopts an axially staggered arrangement design, that is, the groove segments of adjacent annular grooves are staggered from each other at a certain angle in the circumferential direction, preferably 10°-15°. This staggered arrangement allows the flexible zones to be distributed alternately in the circumferential direction, thereby avoiding the concentration of flexibility and achieving multi-directional coordinated deformation, making the compliance of the damping sleeve 1 more uniform in the radial and tangential directions.

[0032] The cross-sectional shape and manufacturing process of the annular groove are determined based on the material properties of the damping sleeve 1. When the damping sleeve 1 is made of thermoplastic elastomer or polyurethane, the annular groove is designed with a circular arc or trapezoidal cross-section to obtain a smooth stress distribution and good molding flow. During the molding stage, the annular groove is directly prefabricated through a mold core or cavity to achieve high-precision integrated molding. When the damping sleeve 1 is made of rubber-like elastic materials such as silicone rubber or fluororubber, the annular groove is designed with a rectangular or approximately rectangular cross-section to facilitate mold release and dimensional control. During manufacturing, a smooth sleeve body is first made, and then the annular groove is formed by CNC turning, molding grooving, or laser cutting. The circumferentially discontinuous groove segment structure is achieved through partitioned molds or post-processing to ensure accurate groove segment distribution and complete connecting bands. Each annular groove forms a discrete flexible zone in the radial direction. When a load is applied, the groove segment independently undergoes elastic deformation to absorb and disperse impact energy. The connecting strip area provides support stiffness to maintain structural stability. At the same time, the gap space formed by the groove wall and the groove bottom induces circumferential airflow during rotation, promotes heat dissipation, and improves the thermal stability and long-term reliability of the shock-absorbing sleeve 1.

[0033] In this embodiment, the micro-textured sub-groove 3 is preferably disposed on the groove wall of the main groove 2 to adjust the interfacial friction characteristics and heat dissipation performance. The micro-textured sub-groove 3 is preferably a dot-matrix, corrugated, or ridge structure. The dot-matrix sub-groove 3 forms regularly arranged micro-dimpled units on the groove wall, with a diameter of 0.2-0.6 mm and a spacing of 0.5-1.5 mm. Under load, it generates local micro-deformation, which can disperse contact stress and improve interfacial energy dissipation. The corrugated sub-groove 3 extends along the direction of the main groove 2, forming a periodically undulating curved surface structure with a wave height of 0.1-0.3 mm. Under shear load, it induces local frictional slippage, enhancing the frictional energy dissipation effect. The ridge-shaped sub-groove 3 consists of slender convex ridges distributed along the direction of the main groove 2, with a ridge height of 0.2 mm and a spacing of 0.5-1 mm. It can guide the stress distribution direction within the groove and form microscale airflow channels between the groove walls to accelerate heat dissipation. Through the structural design of the micro-textured sub-groove 3, the effective surface area of ​​the main groove 2 wall is increased, and the contact interface generates sufficient frictional slippage and energy conversion when subjected to shear. Different types of micro-textured sub-groove 3 structures can be combined and arranged according to the operating conditions to achieve higher energy dissipation efficiency and thermal balance stability under high-frequency variable load conditions, thereby further improving the buffering performance and fatigue life of the damping sleeve 1.

[0034] To further improve the stress distribution and heat conduction performance of the damping sleeve 1 in the axial load transmission direction, the groove structure is designed with multiple main grooves 2 of varying depths distributed along the axial direction, creating a gradient change in the overall groove depth. This gradient change occurs from both ends towards the middle, achieving an overall stiffness distribution that is flexible on the outside and rigid on the inside. The main grooves 2 near the two ends of the damping sleeve 1 are deeper, preferably 15%-20% of the wall thickness; the main grooves 2 in the middle are shallower, preferably 5%-10% of the wall thickness. This gradient arrangement of groove depth creates a continuous change in the local stiffness of the damping sleeve 1 along the axial direction: when torque is transmitted or impact loads are applied, the deep groove area first undergoes elastic deformation to absorb the impact energy, and then the load is gradually transferred to the shallow groove area, achieving a graded release of stress. At the same time, the gradient groove shape forms a heat conduction path from deep to shallow in the structure, allowing heat to gradually diffuse along the axial direction during operation, avoiding heat accumulation in the middle, thereby improving the thermal stability and long-term reliability of the damping sleeve 1.

[0035] In practical applications, the shock-absorbing sleeve 1 of the present invention is installed at the flange connection of the double diaphragm coupling, located between the bolt 7 and the flange hole. In the assembled state, the shock-absorbing sleeve 1 undergoes axial compression deformation under the preload of the bolt 7, and bears alternating radial and tangential loads during the operation of the double diaphragm coupling. When the system transmits torque or experiences minor deviations, the main groove 2 and the micro-textured secondary groove 3 of the shock-absorbing sleeve 1 work together to buffer and dissipate energy. Controllable elastic deformation occurs in the groove walls and bottom areas to absorb and disperse transient energy caused by impact or vibration. Simultaneously, heat is conducted and dissipated through the airflow channels between the grooves to maintain the thermal and mechanical stability of the connection. The shock-absorbing sleeve 1 of the present invention is particularly suitable for diaphragm coupling connections under high-speed, high-precision, or high-frequency start-stop conditions, reducing the fatigue stress level of the diaphragm assembly 5, extending its service life, and improving the overall smoothness and reliability of the transmission system.

[0036] Example 2:

[0037] Based on Example 1, this embodiment optimizes the groove structure of the shock-absorbing sleeve 1. In order to further enhance axial flexibility and heat dissipation performance while maintaining radial flexibility, the structure of the main groove 2 is optimized from the annular groove in Example 1 to a spiral groove structure that runs through both ends, and a thermally conductive elastic filling medium is introduced inside the main groove 2.

[0038] The spiral groove extends axially through both ends of the damping sleeve 1 and continuously at a certain helical angle, forming a flexible channel that connects the grooves circumferentially and axially. Compared with the annular groove structure in Example 1, the continuous spiral groove transforms the discrete flexible band into a coordinated flexible band, enabling the damping sleeve 1 to achieve combined radial and axial deformation under stress, thereby obtaining a smoother stress transmission path and a better buffer response. The helical angle of the spiral groove is 15°-45°, preferably 30°, to balance flexibility and structural stability; the groove width is 5%-8% of the outer diameter of the damping sleeve 1, the groove depth is 10%-20% of the wall thickness, and the groove spacing is continuously distributed axially. Adjacent spiral grooves are arranged in the same or opposite directions, preferably with opposite spirals to form a cross-support structure, further enhancing the overall stability of the damping sleeve 1. The continuous spiral groove induces a spiral airflow channel when rotating, guiding airflow to carry away frictional heat, thereby improving heat dissipation efficiency.

[0039] Furthermore, to improve the heat dissipation performance and energy dissipation efficiency of the shock absorber 1, the main groove 2 is filled with a thermally conductive elastic medium or gel material. The preferred thermally conductive medium is thermally conductive silicone, graphene composite elastomer, or a polymeric gel containing metal oxide fillers, with a thermal conductivity of 0.8-3.0 W / (m·K). The thermally conductive medium is injected into the main groove 2 in a semi-solid or high-viscosity rheological state, and after curing or encapsulation, it forms a tight contact with the groove wall. To prevent the thermally conductive medium from overflowing during operation, a thin sealing film or a heat-resistant elastic protective layer is placed at the opening of the spiral groove, keeping the surface of the main groove 2 closed while the end face remains open. This transforms the main groove 2 from a low-thermal-conductivity air layer into a high-thermal-conductivity composite layer, forming a continuous thermally conductive path along the length of the main groove 2. This reduces the equivalent thermal resistance of the shock absorber 1 and improves the heat dissipation performance of the spiral groove structure under high-speed variable load conditions. Simultaneously, the thermally conductive medium undergoes restricted shear deformation under external loads, participating in stress dissipation and synergistically interacting with the elastic deformation of the shock absorber 1 body. Through the above structural design, the shock absorber 1 maintains flexible response characteristics while having higher energy dissipation efficiency and thermal stability, enabling long-term stable operation under high temperature, high speed or high frequency conditions and extending service life.

[0040] Apart from the improvements mentioned above, the other structural features of the shock-absorbing sleeve 1 are the same as those in Example 1, and will not be described again.

[0041] Example 3:

[0042] Based on Example 1, this application also proposes a double diaphragm coupling including a shock-absorbing sleeve 1 with a groove structure, such as... Figure 2 As shown, it includes two half-couplings 4, two sets of diaphragm groups 5 and an intermediate spacer 6. The half-couplings 4 are located at both ends of the intermediate spacer 6, and the diaphragm groups 5 are respectively arranged between the half-couplings 4 and the intermediate spacer 6 and connected by bolts 7. A damping sleeve 1 with a groove structure is provided between the flange holes of the half-couplings 4 and the intermediate spacer 6 and the bolts 7.

[0043] The two half-couplings 4 of the double diaphragm coupling each include a shaft and a flange. The shaft has a central hole for mounting the drive shaft; this hole can be cylindrical, keyway, or splined, allowing for connection with the driving or driven shaft. The flanges of the two half-couplings 4 are positioned opposite each other, each flange having an even number of flange holes (usually 4-10) evenly distributed along its circumference for mounting the bolt assembly 7 (screws and nuts). The intermediate spacer 6 also has flanges at both ends, with their flange holes corresponding one-to-one with the flange holes of the half-couplings 4. During assembly, the screws pass sequentially through the flange holes of the half-couplings 4, the diaphragm assembly 5, and the intermediate spacer 6, and are then locked with nuts. The diameter of each flange hole varies depending on its function: the through hole used only for mounting the screw has a smaller diameter, while the through hole used for mounting the damping sleeve 1 has a larger diameter to allow for the damping sleeve 1 to be inserted into the hole. Bolts 7 are installed alternately in the circumferential direction, so that the force directions of the two diaphragm assemblies 5 are opposite. Therefore, the flange holes are also alternately distributed. For example, when there are four flange holes, two large holes and two small holes are alternately distributed in the circumferential direction, and the large flange holes of the half-coupling 4 and the small flange holes of the intermediate spacer 6 are opposite each other to form an interlaced assembly relationship. During installation, four damping sleeves 1 are fitted onto the outside of the bolts 7 and embedded in the larger flange holes of the half-coupling 4 or the intermediate spacer 6. Four gaskets 8 are also provided and placed between the smaller flange holes of the half-coupling 4 or the intermediate spacer 6 and the diaphragm assembly 5. After assembly, the diaphragm assembly 5 is fixed between the flange portions of the half-coupling 4 and the intermediate spacer 6, respectively. The two half-couplings 4 are flexibly connected through the diaphragm assembly 5 and bolts 7. The entire double diaphragm coupling is installed between two drive shafts to transmit torque and compensate for minor deviations in the shaft system.

[0044] In this double diaphragm coupling, such as Figure 3 As shown, the damping sleeve 1 is installed between the bolt 7 and the flange hole, forming an elastic isolation layer at the connection. When the double diaphragm coupling transmits torque, the bolt 7 and the diaphragm assembly 5 are subjected to alternating tensile and shear loads. Under the axial clamping force of the bolt 7, the damping sleeve 1 undergoes controllable elastic deformation, absorbing impact loads and attenuating vibration energy in the radial and tangential directions, reducing the tendency for stress concentration at the edge of the diaphragm assembly 5 hole. During the start-up, braking, or high-speed operation of the double diaphragm coupling, the damping sleeve 1 between the bolt 7 and the flange hole reduces the rigid constraint of direct metal-to-metal contact, making the stress change of the diaphragm assembly 5 more gradual and reducing impact peaks. The groove structure forms a micro-circulation airflow channel around the bolt 7 during rotation, promoting the dissipation of frictional heat and maintaining a stable temperature at the connection. The presence of the damping sleeve 1 enables the double diaphragm coupling to maintain stable operation when subjected to high-frequency variable loads or small deviations. The stress distribution between the bolt 7, diaphragm group 5 and flange is more uniform, reducing the tendency of stress concentration at the edge of the hole of diaphragm group 5, and making the operation of diaphragm group 5 more stable under variable load conditions.

[0045] To improve the reliability of the bolt 7 connection, this embodiment provides an anti-loosening structure at the limiting end of the bolt 7. The anti-loosening structure preferably includes one or more of an anti-loosening washer, a locking wire, or thread-locking adhesive. The anti-loosening washer is a spring washer or a toothed anti-slip washer, installed between the nut and the end face of the damping sleeve 1, to provide continuous elastic clamping force in the threaded pair; the locking wire passes radially along the end of the bolt 7 to achieve mechanical limiting; the thread-locking adhesive is applied to the thread surface and, after curing, forms a damping layer between the threads, thereby suppressing relative slippage. When the double diaphragm coupling operates under variable load or vibration conditions, the bolt 7 connection is prone to fretting loosening due to alternating loads. The anti-loosening structure provides additional axial preload holding force, allowing the threaded pair to maintain a tight state under high-frequency vibration conditions. Working in conjunction with the damping sleeve 1 located between the bolt 7 and the flange hole, it improves the anti-loosening capability of the bolt 7 connection, keeping the diaphragm assembly 5 connection in a stable and tight state, preventing fretting loosening under vibration conditions.

[0046] In this embodiment, the bolt hole 7 of the diaphragm assembly 5 is designed as a teardrop shape, with the larger round end facing the inner diameter side of the diaphragm assembly 5 and the tip facing the outer diameter side. This hole shape is formed by laser cutting or precision stamping. The diameter of the larger round end is larger than the screw diameter, and the tip gradually tapers and smoothly transitions to the arc segment, forming a continuous curvature hole edge profile. When the diaphragm assembly 5 undergoes elastic deformation during torsion or bending, the geometric transition structure of the teardrop-shaped hole causes the stress at the hole edge to gradually decrease in the radial direction. The larger round end is used to share the axial tensile load and reduce local stress peaks, while the tip acts as a guide along the radial deformation path, avoiding the stress concentration at the hole edge phenomenon found in traditional round hole structures. The teardrop design makes the deformation process of the diaphragm assembly 5 more gradual under stress, and the stress distribution at the edge of the hole area more uniform, which can improve the fatigue resistance of the diaphragm assembly 5 and delay crack initiation.

[0047] Furthermore, the flexibility direction of the main groove 2 of the damping sleeve 1 is staggered with the flexibility direction of the diaphragm group 5 holes, meaning that the maximum compliance direction of the main groove 2 does not coincide with the principal strain direction of the diaphragm group 5 holes. This arrangement causes the strain peaks to be spatially staggered, allowing load energy to be transferred and dissipated along different paths. The elastic deformation of the damping sleeve 1 and the structural stiffness of the diaphragm group 5 holes complement each other in different directions, maintaining both flexible energy absorption and providing necessary support stiffness, thereby avoiding excessive deformation or stress concentration caused by the superposition of local flexibility. Through the above structural arrangement, the bolt 7 connection system experiences more balanced stress under alternating loads and torque fluctuations, the stress gradient between the diaphragm group 5 holes and the flange connection is alleviated, and the stability of the diaphragm group 5 during cyclic deformation is improved.

[0048] A heat dissipation grooves are provided axially on the inner walls of the flange bores of the half-coupling 4 and the intermediate spacer 6. These grooves are shallow, penetrating the flange thickness and evenly distributed circumferentially, with a depth of 5%-10% of the flange thickness. The heat dissipation grooves are machined using CNC milling, wire cutting, or precision forming processes, with a rounded transition surface at the bottom to avoid stress concentration. When the double diaphragm coupling is rotating at high speed, the heat dissipation grooves form axial flow channels within the flange bores. Airflow or lubricating oil flows along the groove direction, promptly carrying away the frictional heat generated at the contact area between the damping sleeve 1 and the bolt 7, reducing local temperature rise at the connection point, and preventing material performance degradation and thermal fatigue damage caused by heat accumulation. The heat dissipation grooves and the groove structure on the outer surface of the damping sleeve 1 constitute a composite heat dissipation channel, enabling efficient heat conduction and diffusion along the contact interface between the flange and the damping sleeve 1, maintaining temperature equilibrium and thermal stability in the connection area.

[0049] In summary, by introducing a damping sleeve 1 with a grooved structure into the double diaphragm coupling, and combining it with an anti-loosening structure, teardrop-shaped holes, and grooved heat dissipation design, the mechanical and thermal properties of the double diaphragm coupling are optimized. This structure can distribute loads, suppress vibration and heat accumulation, extend the fatigue life of the diaphragm assembly, and ensure the long-term stable operation of the double diaphragm coupling.

[0050] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A shock-absorbing sleeve with a groove structure, characterized in that: The shock-absorbing sleeve is cylindrical, and its outer surface is provided with a groove structure extending circumferentially. The groove structure includes a main groove and a micro-textured secondary groove provided on the main groove. The main grooves are distributed axially with different groove depths, which gradually decrease from both ends to the middle. The micro-textured secondary groove is a corrugated structure provided on the groove wall of the main groove.

2. The shock-absorbing sleeve with a groove structure according to claim 1, characterized in that: The main groove is an annular groove, and its annular surface is perpendicular to the axis of the shock-absorbing sleeve.

3. The shock-absorbing sleeve with a groove structure according to claim 2, characterized in that: The annular grooves are discontinuously distributed.

4. The shock-absorbing sleeve with a groove structure according to claim 1, characterized in that: The material of the shock-absorbing sleeve is polyurethane, thermoplastic polyester elastomer, silicone rubber, or fluororubber.

5. A double diaphragm coupling, comprising two half-couplings, two sets of diaphragms, and an intermediate spacer sleeve, wherein the half-couplings are respectively located at both ends of the intermediate spacer sleeve, and the diaphragm sets are respectively disposed between the half-couplings and the intermediate spacer sleeve and connected by bolts, characterized in that: Between the flange hole of the half coupling and the intermediate spacer sleeve and the bolt, a shock-absorbing sleeve with a groove structure as described in any one of claims 1-4 is provided; the main groove flexibility direction of the shock-absorbing sleeve and the flexibility direction of the diaphragm group hole shape are arranged in a staggered matching manner.

6. The double diaphragm coupling according to claim 5, characterized in that: It also includes an anti-loosening structure, which is disposed at the limiting end of the bolt, and the anti-loosening structure includes an anti-loosening washer, a locking wire, or thread-locking adhesive.

7. The double diaphragm coupling according to claim 6, characterized in that: The bolt holes of the diaphragm assembly are teardrop-shaped, with the larger round end facing the inner diameter side of the diaphragm assembly and the tip facing the outer diameter side.

8. The double diaphragm coupling according to claim 7, characterized in that: The inner wall of the flange hole is provided with heat dissipation grooves along the axial direction.

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