A gasket fastening assembly for automotive parts

Abstract

The utility model provides a kind of fastening assembly of gasket for automobile parts belongs to fastening assembly technical field, the fastening assembly of gasket for automobile parts includes compression seat, limit ring and the locking sleeve connected between compression seat and limit ring, the bottom of compression seat is provided with annular boss, the inner side wall of annular boss is provided with multiple radial distribution limit boss rib, limit ring is sleeved in the outer periphery of annular boss, the inner wall of limit ring is provided with the limit recess that is matched with limit boss rib, the upper end of locking sleeve is connected with the outer peripheral surface of compression seat with screw thread, the lower end inner wall of locking sleeve is provided with inner taper face, the outer wall of limit ring is provided with outer taper face matched with inner taper face, when locking sleeve rotates downward, inner taper face pushes outer taper face and makes limit ring radially contract inward, solve the problem that gasket for automobile parts breaks, deforms and fixed failure due to uneven fastening force and vibration loosening, affect the connection safety and life.

Description

Technical Field

[0001] This utility model belongs to the field of fastening component technology, and more specifically, relates to a fastening component for a gasket used in automotive parts. Background Technology

[0002] In the automotive manufacturing and repair industry, gaskets, as important sealing and cushioning elements, are widely used in the connection parts between various components such as engines, transmissions, and braking systems to prevent fluid leakage, absorb vibration, and compensate for assembly errors between components. As the automotive industry develops towards high performance and long lifespan, the reliability requirements for gasket fastening assemblies are increasing. Existing gasket fastening methods commonly used in technology mainly include direct bolt tightening, snap ring fixing, and simple pressure ring structures. These methods have significant shortcomings in practical applications. Direct bolt tightening is prone to cracking due to excessive localized stress on the gasket caused by improper torque control. Furthermore, the limited number of bolts results in uneven distribution of clamping force, often leaving the gasket edges ineffectively secured. While snap ring fixing is simple to assemble, its vibration resistance is poor. Continuous vibrations generated during vehicle operation can easily cause the snap ring to loosen, leading to gasket displacement and loss of sealing function. Simple pressure ring structures typically use a single friction force to fix the gasket. This fixing method lacks stability when facing thermal expansion caused by temperature changes or high-frequency vibrations, making the gasket prone to rotation or axial movement within the pressure ring. Furthermore, existing fastening components generally lack consideration for gasket material deformation. During the clamping process, stress concentration occurs in the center of the gasket due to the lack of outlet for deformation. After long-term use, the gasket may crack or undergo permanent compression deformation, requiring frequent replacement and increasing maintenance costs. Therefore, there is an urgent need for a fastening component that can achieve uniform gasket clamping, effectively prevent vibration loosening, and protect the gasket from excessive stress damage, in order to meet the technical requirements of modern automotive parts for high reliability and long service life. Utility Model Content

[0003] In view of this, the present invention provides a fastening assembly for gaskets used in automotive parts, which solves the problem of cracking, deformation and fixation failure caused by uneven fastening force and vibration loosening of gaskets in automotive parts, affecting connection safety and lifespan.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a fastening assembly for gaskets used in automotive parts, used to fix gaskets between automotive parts. The fastening assembly includes a clamping seat, a limiting ring, and a locking sleeve connected between the clamping seat and the limiting ring. The bottom of the clamping seat is provided with an annular boss, and the inner side wall of the annular boss is provided with a plurality of radially distributed limiting ribs. The limiting ring is sleeved on the outer periphery of the annular boss, and the inner wall of the limiting ring is provided with a limiting groove that matches the limiting ribs. The upper end of the locking sleeve is threaded to the outer peripheral surface of the clamping seat, and the lower inner wall of the locking sleeve is provided with an inner conical surface. The outer wall of the limiting ring is provided with an outer conical surface that mates with the inner conical surface. When the locking sleeve rotates downward, the inner conical surface pushes the outer conical surface, causing the limiting ring to contract radially inward, thereby creating a tight fit between the limiting groove and the limiting ribs.

[0006] The technical advantages of the fastening assembly for automotive parts gaskets provided by this utility model are as follows: An annular boss is provided at the bottom of the clamping seat, and radially distributed limiting ribs are provided on its inner sidewall. These, along with the limiting groove on the inner wall of the limiting ring, form a multi-point radial limiting structure. When the locking sleeve rotates, the wedge-shaped engagement between the inner and outer conical surfaces causes the limiting ring to radially contract, thereby achieving a tight fit between the limiting groove and the limiting ribs. This structure allows the gasket to obtain a uniform and stable clamping force between automotive parts, effectively preventing displacement or loosening of the gasket under vibration. Simultaneously, the dual mechanism of threaded connection and conical surface engagement ensures that the fastening assembly maintains reliable fixing performance during long-term use.

[0007] Based on the above technical solution, the fastening assembly for a gasket used in automotive parts according to this utility model can be further improved as follows:

[0008] The limiting ribs are evenly distributed along the circumference of the annular boss, and the number of limiting ribs is 6 to 8.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the limiting ribs are evenly distributed along the circumference of the annular boss and there are 6 to 8 of them, so that the clamping force is evenly distributed in the circumference of the gasket, avoiding damage to the gasket due to local stress concentration caused by too few limiting points, and also avoiding the structural complexity and processing difficulties caused by too many limiting points. This configuration of numbers ensures sufficient support while taking into account manufacturing costs and assembly efficiency.

[0010] Furthermore, a circular pressing groove is provided at the top center of the pressing seat, and multiple pressure relief grooves are provided at the bottom of the circular pressing groove in a radial pattern.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: a circular pressing groove is set at the center of the top of the pressing seat and radially distributed pressure relief grooves are set at its bottom. When the gasket is subjected to pressing force, the pressure relief grooves provide a space to accommodate the slight deformation of the gasket material, preventing the central part of the gasket from cracking or permanently deforming due to excessive compression. At the same time, the radial distribution ensures that the pressure is evenly transmitted from the center to the edge, ensuring that the gasket is subjected to balanced force, improving the service life and sealing reliability of the gasket.

[0012] Furthermore, the cross-sectional shape of the limiting rib is trapezoidal, and the width of the end face of the limiting rib away from the inner wall of the annular boss is smaller than the width of the end face close to the inner wall of the annular boss.

[0013] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the limiting rib adopts a trapezoidal cross section and the width of the end face away from the inner wall of the annular boss is smaller than the width of the end face near the inner wall, forming a structure that is wide at the root and narrow at the top. This trapezoidal design enables the limiting rib to have a guiding effect when it is matched with the limiting groove, which facilitates the accurate positioning of the limiting ring during assembly. At the same time, the trapezoidal structure enhances the shear strength of the limiting rib, preventing it from breaking or deforming under the action of fastening force, and ensuring the integrity of the limiting structure during long-term use.

[0014] Furthermore, the outer conical surface of the limiting ring and the inner conical surface of the locking sleeve have the same cone angle, which is 15° to 25°.

[0015] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the outer conical surface of the limiting ring and the inner conical surface of the locking sleeve adopt the same cone angle, and the cone angle is set in the range of 15 degrees to 25 degrees. This cone angle configuration generates a suitable radial contraction force when rotating the locking sleeve. If the cone angle is too small, the self-locking effect will be too strong and it will be difficult to disassemble. If the cone angle is too large, the contraction effect will be insufficient and effective fastening will not be achieved. This cone angle range ensures sufficient radial clamping force and facilitates disassembly operation during subsequent maintenance, thus achieving a balance between fastening performance and maintainability.

[0016] Furthermore, the outer wall of the locking sleeve is provided with a plurality of anti-slip grooves extending along the axial direction, and the cross-sectional shape of the anti-slip grooves is rectangular or trapezoidal.

[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the outer wall of the locking sleeve is provided with an anti-slip groove extending along the axis and the cross-section is rectangular or trapezoidal. When the operator rotates the locking sleeve, the anti-slip groove increases the friction between the fingers or tools and the surface of the locking sleeve, preventing slippage due to the smooth surface. The rectangular or trapezoidal groove design ensures the anti-slip effect while avoiding sharp edges from causing injury to the operator, thus improving the convenience and safety of operation of the fastening components in the actual assembly and disassembly process.

[0018] Furthermore, the height of the annular boss is greater than the height of the limiting rib, and the height of the step formed by the top surface of the annular boss and the bottom of the pressing seat is 1 to 2 times the height of the limiting rib.

[0019] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the height of the annular boss is greater than the height of the limiting rib, forming a stepped structure equivalent to 1 to 2 times the height of the limiting rib. This height difference design allows the limiting ring to first contact the stepped surface rather than directly contact the limiting rib when it is fitted onto the outer periphery of the annular boss, providing a reference surface for the initial positioning of the limiting ring and preventing the limiting ring from tilting during assembly, which would cause the limiting groove and the limiting rib to misalign. At the same time, the stepped structure enhances the rigidity of the annular boss and improves the deformation resistance of the clamping seat when subjected to clamping force.

[0020] Furthermore, the limiting ring is provided with at least one through cut along the radial direction, the cut forming an open ring structure for generating radial contraction deformation when pushed by the inner conical surface.

[0021] The beneficial effects of the above-mentioned improvement scheme are as follows: the limiting ring is provided with a through cut along the radial direction to form an open ring structure. When the inner conical surface of the locking sleeve pushes the outer conical surface, the cut allows the limiting ring to undergo radial contraction deformation, so that the limiting groove can tightly bite the limiting rib. If the limiting ring is a completely closed ring structure, it cannot undergo radial contraction and loses its fastening effect. The open design gives the limiting ring the necessary elastic deformation ability to ensure that the fastening mechanism can be realized. At the same time, the limiting ring can easily be disassembled by relying on its own elasticity to return to its original shape after the external force is removed.

[0022] Furthermore, the clamping seat is made of aluminum alloy, the limiting ring is made of elastic steel, and the locking sleeve is made of stainless steel.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the clamping seat is made of aluminum alloy material, which has the characteristics of being lightweight and reduces the overall weight of the fastening assembly; the limit ring is made of elastic steel material to ensure that it has good elastic deformation capacity and sufficient strength when radially contracted; the locking sleeve is made of stainless steel material, which provides excellent corrosion resistance and surface hardness. The reasonable combination of the three materials enables each component of the fastening assembly to meet the functional requirements while taking into account the requirements of weight control and durability, and adapting to the use environment of automotive parts under complex working conditions.

[0024] Furthermore, the number of pressure relief grooves is 4 to 6, and the pressure relief grooves extend radially from the center of the circular pressing groove to the edge, with the width of the pressure relief grooves gradually increasing along the extending direction.

[0025] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The number of pressure relief grooves is set to 4 to 6, which extend radially from the center of the circular pressing groove to the edge and the width gradually increases along the extension direction. This design allows the pressure in the central area of ​​the gasket to be gradually released to the outside through the pressure relief grooves. The groove shape with increasing width conforms to the distribution law of pressure diffusion from the center to the edge, avoiding the stress change caused by sudden pressure release in a certain area, ensuring that the gasket is subjected to a smooth transition of force throughout the pressing process, reducing the risk of gasket damage caused by stress concentration, and improving the reliability of the gasket in repeated assembly and use.

[0026] Compared with existing technologies, the advantages of this utility model for fastening gaskets in automotive parts are as follows: This utility model, by setting an annular boss at the bottom of the clamping seat and configuring radially distributed limiting ribs, combined with the limiting grooves on the inner wall of the limiting ring, forms a multi-point circumferential limiting structure. The radial contraction force generated by the conical fit between the locking sleeve and the limiting ring achieves uniform clamping and reliable fixing of the gasket, effectively solving the problem of uneven fastening force distribution in existing technologies. The circular clamping groove and radial pressure relief groove at the top of the clamping seat provide buffer space for gasket material deformation, preventing the gasket from cracking due to localized stress concentration, while ensuring that pressure is smoothly transmitted from the center to the edge, significantly improving the gasket's service life. The trapezoidal fit structure of the limiting ribs and limiting grooves, along with the optimized design of the conical angle, ensures that the fastening assembly maintains a stable locking state even under continuous vibration during vehicle operation, preventing loosening. The rational selection of materials balances lightweight and durability requirements, enabling the fastening assembly to meet the long-term use requirements of automotive parts in complex environments such as high temperature and corrosion. The overall structure is simple and easy to assemble. Operators can complete the fastening or disassembly by rotating the locking sleeve, which significantly improves assembly efficiency and maintenance convenience. Compared with existing technologies, it has significant improvements in fastening reliability, gasket protection, vibration resistance and service life. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 An example diagram of a fastening assembly for a gasket used in automotive parts;

[0029] Figure 2 A bottom view of a fastening assembly for a gasket used in automotive parts;

[0030] Figure 3 An exploded view of a fastening assembly for a gasket used in automotive parts;

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 10. Pressing seat; 11. Annular boss; 20. Limiting ring; 21. Limiting groove; 30. Locking sleeve. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0034] like Figures 1-3 The diagram shows an example of a fastening assembly for gaskets used in automotive parts, provided by this utility model. The assembly is used to fix gaskets between automotive parts. The fastening assembly includes a pressure seat 10, a limiting ring 20, and a locking sleeve 30 connecting the pressure seat 10 and the limiting ring 20. The pressure seat 10 has an annular boss 11 at its bottom, and multiple radially distributed limiting ribs are provided on the inner wall of the annular boss 11. The limiting ring 20 is sleeved on the outer periphery of the annular boss 11, and its inner wall has a limiting groove 21 that matches the limiting ribs. The upper end of the locking sleeve 30 is threaded to the outer circumferential surface of the pressure seat 10, and the lower inner wall of the locking sleeve 30 has an inner conical surface. The outer wall of the limiting ring 20 has an outer conical surface that mates with the inner conical surface. When the locking sleeve 30 rotates downwards, the inner conical surface pushes the outer conical surface, causing the limiting ring 20 to contract radially inwards, thereby creating a tight fit between the limiting groove 21 and the limiting ribs.

[0035] The specific operation or usage method is as follows: First, place the gasket to be fixed at the connection position of the automotive part, ensuring that the center of the gasket is aligned with the mounting hole or connection surface of the part. Place the clamping seat above the gasket, so that the area around the annular boss at the bottom of the clamping seat contacts the outer edge of the gasket, at which point the circular clamping groove is located above the center of the gasket. Take the limiting ring and slip it onto the outer circumference of the annular boss from below the clamping seat. During the insertion process, pay attention to aligning the limiting groove on the inner wall of the limiting ring with the limiting rib on the inner side wall of the annular boss. Since the limiting rib has a trapezoidal cross-section and a guiding function, the limiting ring can be slightly rotated and adjusted to initially align the limiting groove with the limiting rib. Slip the locking sleeve onto the outer circumference of the clamping seat from below, aligning the internal thread at the upper end of the locking sleeve with the external thread on the outer circumference of the clamping seat. Begin to rotate the locking sleeve clockwise to move it upward along the thread and gradually tighten the limiting ring. During rotation, the operator applies rotational torque by pressing their fingers or a wrench against the anti-slip groove on the outer wall of the locking sleeve. The friction provided by the anti-slip groove ensures stable force application without slippage. As the locking sleeve continues to rotate upward, its inner conical surface generates a wedge-shaped thrust on the outer conical surface of the limiting ring. Under the radial thrust, the limiting ring contracts inward, and the limiting groove and the limiting rib gradually engage tightly. When a significant increase in rotational resistance is felt, it indicates that the limiting ring has fully contracted to its position. At this point, rotation of the locking sleeve is stopped, and the tightening operation is complete. Throughout the tightening process, the pressure seat applies a uniform pressure to the gasket. The pressure relief groove allows slight deformation of the gasket material to be released outward, preventing damage to the gasket due to excessive compression. When disassembly is required, the operator rotates the locking sleeve counterclockwise to move it downward along the thread. The thrust of the inner conical surface against the outer conical surface disappears, and the limiting ring returns to its initial diameter due to its own elasticity. The engagement between the limiting groove and the limiting rib automatically disengages. At this point, the locking sleeve, limiting ring, and pressure seat can be removed in sequence to complete the disassembly operation.

[0036] In the above technical solution, the limiting ribs are evenly distributed around the annular boss 11, and the number of limiting ribs is 6 to 8.

[0037] Furthermore, in the above technical solution, a circular pressing groove is provided at the top center of the pressing seat 10, and multiple pressure relief grooves are provided at the bottom of the circular pressing groove in a radial pattern.

[0038] Furthermore, in the above technical solution, the cross-sectional shape of the limiting rib is trapezoidal, and the width of the end face of the limiting rib away from the inner wall of the annular boss 11 is smaller than the width of the end face near the inner wall of the annular boss 11.

[0039] Furthermore, in the above technical solution, the outer conical surface of the limiting ring 20 and the inner conical surface of the locking sleeve 30 have the same cone angle, which is 15° to 25°.

[0040] Furthermore, in the above technical solution, the outer wall of the locking sleeve 30 is provided with a plurality of anti-slip grooves extending along the axial direction, and the cross-sectional shape of the anti-slip grooves is rectangular or trapezoidal.

[0041] Furthermore, in the above technical solution, the height of the annular boss 11 is greater than the height of the limiting rib, and the step height formed by the top surface of the annular boss 11 and the bottom of the pressing seat 10 is 1 to 2 times the height of the limiting rib.

[0042] Furthermore, in the above technical solution, the limiting ring 20 is provided with at least one through cut along the radial direction. The cut makes the limiting ring 20 form an open ring structure, which is used to generate radial contraction deformation when pushed by the inner conical surface.

[0043] Furthermore, in the above technical solution, the clamping seat 10 is made of aluminum alloy, the limiting ring 20 is made of elastic steel, and the locking sleeve 30 is made of stainless steel.

[0044] Furthermore, in the above technical solution, the number of pressure relief grooves is 4 to 6, and the pressure relief grooves extend radially from the center of the circular pressing groove to the edge, with the width of the pressure relief grooves gradually increasing along the extension direction.

[0045] Specific Embodiment 1: This embodiment provides a gasket fastening assembly applied between the cylinder head and cylinder block of an automotive engine. The clamping seat is made of aluminum alloy 6061 material and is formed by CNC machine tool. The clamping seat has a disc-shaped structure with an outer diameter of 85mm and a thickness of 12mm. The bottom is provided with an annular boss with an outer diameter of 70mm, an inner diameter of 50mm, and a height of 8mm. Seven limiting ribs are evenly distributed circumferentially on the inner side wall of the annular boss. The central angle between adjacent limiting ribs is 51 degrees. The cross-section of each limiting rib is trapezoidal. The width of the base of the trapezoid, which is the width near the inner side wall of the annular boss, is 4mm. The width of the top of the trapezoid, which is the width away from the inner side wall, is 2mm. The height of the trapezoid, which is the radial protrusion height of the limiting rib, is 3mm. A circular clamping groove is machined at the center of the top of the clamping seat. The groove has a diameter of 35mm and a depth of 2mm. Five radially distributed pressure relief grooves are set at the bottom of the groove. Each pressure relief groove extends from the center of the groove to the edge. The width of the pressure relief groove at the center is 1mm, and the width gradually increases to 3mm as it extends towards the edge. The depth of the pressure relief groove is 1mm. The limiting ring is made of elastic steel 65Mn and is formed after heat treatment. The limiting ring has an open ring structure with an outer diameter of 72mm, an inner diameter of 68mm, and a height of 6mm. A through cut with a width of 2mm is set in the radial direction. The inner wall of the limiting ring is machined with 7 limiting grooves that match the limiting ribs of the clamping seat. The cross-section of each limiting groove is trapezoidal and its dimensions match the limiting ribs. The bottom width of the groove is 2mm, the opening width is 4mm, and the depth is 3mm. The outer wall of the limiting ring is machined with an outer conical surface with a taper angle of 20 degrees. The inner diameter of the outer conical surface gradually decreases from the bottom to the top of the limiting ring, with a bottom diameter of 72mm and a top diameter of 68mm. The locking sleeve is made of 304 stainless steel and is machined. The locking sleeve has a cylindrical structure with an outer diameter of 90mm, an inner diameter of 78mm at the top and 68mm at the bottom, and a total height of 15mm. The upper inner wall is machined with an internal thread with a pitch of 2mm to mate with the external thread on the outer circumference of the pressure seat. The lower inner wall is machined with an inner conical surface with a taper angle of 20 degrees to mate with the outer conical surface of the limiting ring. The inner diameter of the inner conical surface gradually increases from the bottom to the top of the locking sleeve. Six anti-slip grooves are evenly distributed axially on the outer wall of the locking sleeve. Each anti-slip groove is 3mm wide, 2mm deep, and has a rectangular cross-section. The central angle between adjacent anti-slip grooves is 60 degrees.During use, place the engine cylinder head gasket made of graphite composite material on the upper surface of the cylinder block. The cylinder head gasket has an outer diameter of 80mm and a thickness of 1mm. Place the clamping seat on the cylinder head gasket and align the circular clamping groove with the center of the cylinder head gasket. From below, insert the limiting ring onto the outer circumference of the annular boss. Adjust the limiting ring so that its limiting groove and limiting rib are initially aligned. Insert the locking sleeve from below and start rotating it clockwise. During the rotation, the inner conical surface of the locking sleeve pushes the outer conical surface of the limiting ring, causing the diameter of the limiting ring to gradually shrink from the initial 72mm to 69mm. The limiting groove and the limiting rib tightly engage to form a circumferential lock. Continue rotating the locking sleeve until the rotational resistance increases significantly and the feel is tight. At this point, the cylinder head gasket is evenly compressed, and the clamping force is distributed to all positions around the gasket through the 7 limiting ribs. The pressure relief groove allows a small amount of material flow in the center of the cylinder head gasket to avoid stress concentration. The entire fastening assembly can maintain stable fixation even when subjected to temperature changes and vibration impacts during engine operation.

[0046] Specific Embodiment 2: This Embodiment 2 is based on Embodiment 1, with the number of limiting ribs adjusted to 8, the central angle between adjacent limiting ribs adjusted to 45 degrees, and the number of limiting grooves on the inner wall of the limiting ring also increased to 8. The remaining structural dimensions and materials remain the same as in Embodiment 1. The increased number of limiting ribs makes the circumferential fixing points of the gasket more dense and the clamping force distribution more uniform, making it particularly suitable for applications with extremely high sealing performance requirements. The increased number of limiting points allows the fastening assembly to maintain a stable engagement state even under greater vibration amplitude, preventing overall loosening due to the failure of individual limiting points. It is suitable for use in environments with high vibration intensity, such as heavy trucks or off-road vehicles. The number of pressure relief grooves is adjusted to 6 to match the increased limiting points. The pressure relief grooves are evenly distributed radially from the center of the circular clamping groove. Each pressure relief groove has a center width of 1mm, an edge width of 3mm, and a depth of 1mm. The six pressure relief grooves provide a more thorough pressure release path, further reducing the stress level in the central area of ​​the gasket and improving the gasket's resistance to breakage under high pressure conditions.

[0047] Specifically, the principle of this utility model is as follows: This fastening assembly adopts a dual fixing mechanism combining multi-point radial limiting and conical wedge tightening, fundamentally solving the technical problems of uneven gasket fastening force and insufficient vibration resistance. Multiple radially distributed limiting ribs are provided on the inner wall of the annular boss at the bottom of the clamping seat, and corresponding limiting grooves are provided on the inner wall of the limiting ring. When the limiting ring is fitted onto the outer circumference of the annular boss, the limiting grooves and limiting ribs form a circumferential multi-point limiting relationship. This limiting structure distributes the fixing effect of the gasket to multiple circumferential positions, avoiding a single point or a few points bearing all the fixing force. The locking sleeve is connected to the pressure seat by threads. The inner conical surface of its lower end inner wall and the outer conical surface of the outer wall of the limiting ring form a wedge-shaped fit. When the operator rotates the locking sleeve to move it downward, the inner conical surface generates an oblique thrust on the outer conical surface. This oblique thrust can be decomposed into an axial component and a radial component. The radial component forces the limiting ring to contract radially inward. Since the limiting ring has a through cut along the radial direction to form an open ring structure, the cut gives the limiting ring the ability to deform radially contract. When the limiting ring contracts, the limiting groove tightly engages with the limiting rib, forming a strong circumferential anti-rotation and anti-vibration capability. The circular clamping groove at the top of the clamping seat and the radial pressure relief grooves form a pressure buffering mechanism. When the gasket is clamped by the clamping seat, the slight plastic deformation of the gasket material under pressure flows into the pressure relief grooves. The presence of the pressure relief grooves allows the pressure in the central area of ​​the gasket to be released to the periphery, preventing excessive stress concentration in the center. The radial distribution of the pressure relief grooves ensures that the pressure is evenly transmitted in all directions, and the design of the width increasing along the extension direction conforms to the pressure diffusion law, making the pressure release more gradual. The limiting rib adopts a trapezoidal cross-section, with a shape that is wide at the root and narrow at the top. During the contraction of the limiting ring, it plays a guiding role, ensuring that the limiting groove accurately enters the mating position of the limiting rib. At the same time, the trapezoidal structure gives the limiting rib a larger shear resistance area, enhancing its load-bearing capacity. The cone angle is set in the range of 15 degrees to 25 degrees. This angle can generate sufficient radial clamping force while avoiding excessive self-locking effect, ensuring that both tightening and disassembly operations can be carried out smoothly. In terms of material selection, aluminum alloy is used for the clamping seat to reduce weight, elastic steel is used for the limit ring to ensure deformation and rebound performance, and stainless steel is used for the locking sleeve to provide corrosion resistance. The physical properties of the three materials are precisely matched with the functional requirements of each component, jointly achieving long-term stable operation of the fastening assembly. The entire technical solution, through the ingenious combination of structural optimization and mechanical principles, significantly improves the reliability and service life of the gasket fastening without increasing the complexity of the components.

Claims

1. A fastening assembly for gaskets used in automotive parts, used to secure gaskets between automotive parts, characterized in that, The fastening assembly includes a clamping seat, a limiting ring, and a locking sleeve connecting the clamping seat and the limiting ring. The clamping seat has an annular boss at its bottom, and the inner wall of the annular boss has multiple radially distributed limiting ribs. The limiting ring is sleeved on the outer circumference of the annular boss, and the inner wall of the limiting ring has a limiting groove that matches the limiting ribs. The upper end of the locking sleeve is threaded to the outer circumferential surface of the clamping seat, and the lower inner wall of the locking sleeve has an inner conical surface. The outer wall of the limiting ring has an outer conical surface that mates with the inner conical surface. When the locking sleeve rotates downward, the inner conical surface pushes the outer conical surface, causing the limiting ring to contract radially inward, thereby creating a tight fit between the limiting groove and the limiting ribs.

2. The fastening assembly for a gasket used in automotive parts according to claim 1, characterized in that, The limiting ribs are evenly distributed along the circumference of the annular boss, and the number of the limiting ribs is 6 to 8.

3. The fastening assembly for a gasket used in automotive parts according to claim 2, characterized in that, The top center of the clamping seat is provided with a circular clamping groove, and the bottom of the circular clamping groove is provided with multiple radially distributed pressure relief grooves.

4. The fastening assembly for a gasket for automotive parts according to claim 3, characterized in that, The cross-sectional shape of the limiting rib is trapezoidal, and the width of the end face of the limiting rib away from the inner wall of the annular boss is smaller than the width of the end face close to the inner wall of the annular boss.

5. A fastening assembly for a gasket used in automotive parts according to claim 4, characterized in that, The outer conical surface of the limiting ring and the inner conical surface of the locking sleeve have the same cone angle, which is 15° to 25°.

6. A fastening assembly for a gasket used in automotive parts according to claim 5, characterized in that, The outer wall of the locking sleeve is provided with a plurality of anti-slip grooves extending along the axial direction, and the cross-sectional shape of the anti-slip grooves is rectangular or trapezoidal.

7. A fastening assembly for a gasket in an automotive component according to claim 6, characterized in that, The height of the annular boss is greater than the height of the limiting rib, and the height of the step formed by the top surface of the annular boss and the bottom of the pressing seat is 1 to 2 times the height of the limiting rib.

8. A fastening assembly for a gasket in an automotive component according to claim 7, characterized in that, The limiting ring has at least one through cut along the radial direction, which makes the limiting ring form an open ring structure, so as to generate radial contraction deformation when pushed by the inner conical surface.

9. A fastening assembly for a gasket for automotive parts according to claim 8, characterized in that, The clamping seat is made of aluminum alloy, the limiting ring is made of elastic steel, and the locking sleeve is made of stainless steel.

10. A fastening assembly for a gasket for automotive parts according to claim 9, characterized in that, The number of pressure relief grooves is 4 to 6, and the pressure relief grooves extend radially from the center of the circular pressing groove to the edge, with the width of the pressure relief grooves gradually increasing along the extension direction.

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