High-toughness four-layer spring winding composite sleeve fixing device for vehicle

Abstract

The utility model provides a kind of high tenacity four-layer spring winding composite sleeve fixing device for vehicle, it is related to composite sleeve fixing technical field, including fixed device main part, the middle of fixed device main part is provided with locking ring, the both ends of fixed device main part are equipped with flange, and the other end surface of two flanges is installed on frame;Cross helical ratchet set in locking ring is matched with the spring winding helical direction of composite sleeve outer layer, forms mechanical interlock, effectively prevents the circumferential skidding of sleeve when vehicle sudden acceleration or braking, avoids loose connection, simultaneously, the locking force of micro piezoelectric ceramic pump in annular hydraulic cavity can be dynamically adjusted, ensure to keep stable clamping under different working conditions, compared with traditional friction fixing mode, torsional strength is improved by more than 40%.

Description

Technical Field

[0001] This utility model relates to the field of composite sleeve fixing technology, and in particular to a high-toughness automotive four-layer coiled spring composite sleeve fixing device. Background Technology

[0002] Multi-layer spring-coated composite sleeves, such as four layers of metal plus rubber composite structures, are commonly used in automobile chassis, transmission systems, or exhaust systems for vibration reduction, noise reduction, and impact resistance.

[0003] Traditional fixing devices, such as clamps or flanges, rely solely on friction to secure the sleeve. However, during rapid acceleration or braking, this method can easily cause the sleeve to slip circumferentially, leading to loosening of the connection and affecting vehicle safety and lifespan. Furthermore, while rigid fixing devices like welded flanges offer a more robust connection, they directly transmit high-frequency vibrations to the vehicle body, exacerbating noise, vibration, and acoustic roughness issues, severely impacting the driving experience. More importantly, the ambient temperature of automobiles varies drastically, from -40°C to 120°C. Under these conditions, the difference in thermal expansion coefficients between the metal and rubber layers significantly increases stress concentration in the fixing device, potentially leading to crack formation after prolonged use and severely affecting the safety and reliability of the vehicle's wiring harness. Therefore, we propose a high-toughness automotive four-layer spring-coated composite sleeve fixing device. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies. Traditional fixing devices, such as clamps or flanges, rely solely on friction to secure the sleeve. However, during rapid acceleration or braking of a vehicle, this method of fixing can easily cause the sleeve to slip in the circumferential direction, leading to a loose connection and affecting vehicle safety and service life. Furthermore, while rigid fixing devices such as welded flanges provide a more stable connection, they directly transmit high-frequency vibrations to the vehicle body, exacerbating noise, vibration, and acoustic roughness issues, severely impacting the driving experience. More importantly, the ambient temperature of a car varies greatly, from -40°C to 120°C. Under these conditions, the difference in thermal expansion coefficients between the metal and rubber layers significantly increases stress concentration in the fixing device, potentially leading to crack formation after long-term use and severely affecting the safety and reliability of the vehicle's wiring harness.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A high-toughness automotive four-layer coiled spring composite sleeve fixing device includes a fixing device body, a locking ring is provided in the middle of the fixing device body, and flanges are installed at both ends of the fixing device body. The other end faces of the two flanges are installed on the vehicle frame.

[0007] Furthermore, the locking ring has a spiral groove that matches the spring-coated composite sleeve, and the spiral groove has several ratchet teeth.

[0008] Furthermore, each of the ratchet teeth is arranged in a cross-helical pattern on each segment of the helical groove, and each of the ratchet teeth matches the helical direction of the outer layer of the composite sleeve.

[0009] Furthermore, the locking ring has an annular hydraulic chamber inside, which surrounds the entire locking ring, and a miniature piezoelectric ceramic pump is installed inside the annular hydraulic chamber.

[0010] Furthermore, the diameter of the two flanges is larger than the diameter of the locking ring, and three mounting grooves are spirally arranged at equal intervals on the outer side wall of the two flanges. Each mounting groove is equipped with a sector-shaped wedge, and each of the three sector-shaped wedges has several mounting holes.

[0011] Furthermore, the bottom of the mounting groove is provided with an inclined surface, and the angle of the inclined surface is 12°. The fan-shaped wedge block is in contact with the inclined surface at the bottom of the mounting groove. A memory alloy spring is installed inside the mounting groove, and the other end of the memory alloy spring is connected to the fan-shaped wedge block.

[0012] Furthermore, all three sector-shaped wedges are 120°, the spiral arrangement direction of the three sector-shaped wedges matches the spiral direction of the sleeve, and the surface of the sector-shaped wedges is provided with anti-slip mesh texture.

[0013] Furthermore, the mounting hole is a tapered enlarged hole, and a bolt is provided on the mounting hole. The bolt's thread has a 12° taper, which matches the mounting hole.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. The cross-helical ratchet teeth inside the locking ring match the helical direction of the coiled spring on the outer layer of the composite sleeve, forming a mechanical interlock. This effectively prevents the sleeve from slipping circumferentially during rapid acceleration or braking of the vehicle, avoiding loosening of the connection. At the same time, the miniature piezoelectric ceramic pump in the annular hydraulic chamber can dynamically adjust the locking force to ensure stable clamping under different working conditions. Compared with the traditional friction fixing method, the torsional resistance is improved by more than 40%.

[0016] 2. The fan-shaped wedges on the flange, together with the shape memory alloy springs, form a gradient buffer system that can absorb axial, radial and torsional vibrations, reducing the vibration transmission rate to below 30%. The helical direction of the wedges is consistent with the helical direction of the sleeve, ensuring that the vibration energy is dispersed along the helical path and avoiding local stress concentration.

[0017] 3. Within the temperature range of -40℃ to 120℃, the spring can automatically adjust the preload according to the temperature to compensate for the difference in thermal expansion between the metal and rubber layers, avoiding cracking caused by stress concentration. In addition, the 12° tapered bolt fits the bevel of the mounting hole, which can maintain uniform clamping force when the temperature expands, preventing thermal failure. Attached Figure Description

[0018] Figure 1 A schematic diagram of the overall structure of a high-toughness automotive four-layer coiled spring composite sleeve fixing device provided by this utility model;

[0019] Figure 2 A schematic diagram of the locking ring structure of a high-toughness automotive four-layer coiled spring composite sleeve fixing device provided by this utility model;

[0020] Figure 3 A schematic diagram of the flange groove structure of a high-toughness automotive four-layer coiled spring composite sleeve fixing device provided by this utility model;

[0021] Figure 4 This utility model provides a schematic diagram of the bolt structure of a high-toughness automotive four-layer coiled spring composite sleeve fixing device.

[0022] Legend: 1. Main body of the fixing device; 2. Flange; 101. Locking ring; 102. Spiral groove; 103. Ratchet; 104. Annular hydraulic chamber; 201. Mounting groove; 202. Sector-shaped wedge; 203. Mounting hole; 204. Memory alloy spring; 205. Bolt. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0024] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be provided below with reference to relevant embodiments, and several embodiments of this utility model will be given. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this utility model more thorough and complete.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. Example 1

[0027] like Figure 1-4 As shown, this utility model provides a technical solution: a high-toughness automotive four-layer coiled spring composite sleeve fixing device, including a fixing device body 1, a locking ring 101 is provided in the middle of the fixing device body 1, the cross spiral ratchet 103 provided in the locking ring 101 matches the spiral direction of the coiled spring of the outer layer of the composite sleeve to form a mechanical interlock, effectively preventing the sleeve from slipping around the circumference when the vehicle accelerates or brakes rapidly, and avoiding loosening of the connection. Flanges 2 are installed at both ends of the fixing device body 1, and the other end faces of the two flanges 2 are installed on the vehicle frame. Example 2

[0028] like Figure 1-4 As shown, the locking ring 101 has a spiral groove 102 that matches the spring-loaded composite sleeve. Several ratchet teeth 103 are arranged within the spiral groove 102, each ratchet tooth 103 being arranged in a cross-spiral pattern on each segment of the spiral groove 102. Each ratchet tooth 103 matches the spiral direction of the outer layer of the composite sleeve. An annular hydraulic cavity 104 is provided inside the locking ring 101, surrounding the entire locking ring 101. A miniature piezoelectric ceramic pump is installed inside the annular hydraulic cavity 104. Two hydraulic quick-connect interfaces are symmetrically distributed on the outer wall of the locking ring 101 and are connected to the annular hydraulic cavity 104. The miniature piezoelectric ceramic pump inside the annular hydraulic cavity 104 can dynamically adjust the locking force to ensure stable clamping under different working conditions. Compared with the traditional friction fixing method, the torsional resistance is improved by more than 40%.

[0029] The diameters of the two flanges 2 are larger than the diameter of the locking ring 101. Three mounting grooves 201 are spirally arranged at equal intervals on the outer side wall of the two flanges 2. Each mounting groove 201 is equipped with a sector-shaped wedge 202. The root of the sector-shaped wedge 202 is hard and the contact surface is soft. Several mounting holes 203 are opened on each of the three sector-shaped wedges 202. The bottom of the mounting groove 201 is provided with an inclined surface with an angle of 12°. The bottom of the sector-shaped wedge 202 matches the inclined surface at the bottom of the mounting groove 201. A memory alloy spring 204 is installed inside the mounting groove 201. The other end of the memory alloy spring 204 is connected to the sector-shaped wedge 202. At room temperature, the memory alloy spring 204 pushes the sector-shaped wedge 202 to generate an initial preload of 5-8N. When the temperature rises to 80℃, the shape memory alloy spring 204 undergoes secondary deformation, increasing the preload to 15N to compensate for the gap caused by thermal expansion. The three sector-shaped wedges 202 are all 120°, and the spiral arrangement direction of the three sector-shaped wedges 202 matches the spiral direction of the sleeve. The spiral gradient wedges can simultaneously suppress axial, radial, and torsional vibrations, and dynamic pressure adjustment is achieved through the tapered bolts 205. The surface of the sector-shaped wedges 202 is provided with anti-slip grid patterns. The mounting hole 203 is a tapered enlarged hole, and a bolt 205 is provided on the mounting hole 203. The bolt 205 has a 12° taper on its thread, which fits into the mounting hole 203. The 12° taper bolt 205 fits into the inclined surface of the mounting hole 203, which can maintain a uniform clamping force during high-temperature expansion and prevent thermal failure.

[0030] The working process of this utility model is as follows: When using a high-toughness automotive four-layer coiled spring composite sleeve fixing device, firstly, the composite sleeve is inserted into the locking ring 101 of the fixing device. The cross spiral ratchet 103 provided in the locking ring 101 matches the spiral direction of the coiled spring on the outer layer of the sleeve to form a mechanical interlock, preventing the sleeve from slipping around the circumference. The flange 2 is fixed to the frame by bolts 205. During installation, the 12° taper of the tapered bolt 205 matches the inclined surface of the mounting hole 203 to ensure that the initial preload is evenly distributed.

[0031] When the vehicle is running, the miniature piezoelectric ceramic pump adjusts the pressure of the annular hydraulic chamber 104 according to the working conditions, enhances the radial clamping force of the locking ring 101 on the sleeve, and improves the anti-torsion capability. At the same time, the fan-shaped wedge 202 on the flange 2 adapts to temperature changes under the action of the memory alloy spring 204. The pre-tightening force is 5-8N at room temperature and increased to 15N at high temperature. Its gradient hardness design with a hard root, soft contact surface and spiral arrangement effectively absorbs multi-directional vibration and reduces the noise and vibration transmitted to the vehicle body.

[0032] Under ambient temperature fluctuations of -40℃ to 120℃, the shape memory alloy spring 204 automatically adjusts its deformation to compensate for the difference in thermal expansion between the metal and rubber layers; the tapered bolt 205 maintains its inclined surface compression at high temperatures to avoid thermal failure; and the anti-slip grid patterned fan-shaped wedge 202 shows visible wear, facilitating maintenance and ensuring long-term stable operation of the device.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-toughness automotive four-layer coiled spring composite sleeve fixing device, comprising a fixing device body (1), characterized in that: A locking ring (101) is provided in the middle of the main body (1) of the fixing device, and flanges (2) are installed at both ends of the main body (1). The other end faces of the two flanges (2) are installed on the frame.

2. The high-toughness automotive four-layer coiled spring composite sleeve fixing device according to claim 1, characterized in that: The locking ring (101) has a spiral groove (102) that fits into the spring composite sleeve, and the spiral groove (102) has a number of ratchet teeth (103).

3. The high-toughness automotive four-layer coiled spring composite sleeve fixing device according to claim 2, characterized in that: Each of the ratchet teeth (103) is arranged in a cross-helical pattern on each segment of the helical groove (102), and each of the ratchet teeth (103) matches the helical direction of the outer layer of the composite sleeve.

4. The high-toughness automotive four-layer coiled spring composite sleeve fixing device according to claim 1, characterized in that: The locking ring (101) has an annular hydraulic chamber (104) inside, which surrounds the entire locking ring (101). A miniature piezoelectric ceramic pump is installed inside the annular hydraulic chamber (104).

5. The high-toughness automotive four-layer coiled spring composite sleeve fixing device according to claim 1, characterized in that: The diameter of the two flanges (2) is larger than the diameter of the locking ring (101). Three mounting grooves (201) are spirally arranged at equal intervals on the outer side wall of the two flanges (2). Each mounting groove (201) is equipped with a fan-shaped wedge (202). Each of the three fan-shaped wedges (202) has several mounting holes (203).

6. The high-toughness automotive four-layer coiled spring composite sleeve fixing device according to claim 5, characterized in that: The bottom of the mounting groove (201) is provided with an inclined surface, and the angle of the inclined surface is 12°. The ground of the fan-shaped wedge (202) matches the inclined surface at the bottom of the mounting groove (201). A memory alloy spring (204) is installed inside the mounting groove (201), and the other end of the memory alloy spring (204) is connected to the fan-shaped wedge (202).

7. A high-toughness automotive four-layer coiled spring composite sleeve fixing device according to claim 5, characterized in that: All three fan-shaped wedges (202) are 120°, and the spiral arrangement direction of the three fan-shaped wedges (202) matches the spiral direction of the sleeve. The surface of the fan-shaped wedges (202) is provided with anti-slip grid texture.

8. A high-toughness automotive four-layer coiled spring composite sleeve fixing device according to claim 5, characterized in that: The mounting hole (203) is a tapered enlarged hole, and a bolt (205) is provided on the mounting hole (203). The bolt (205) has a 12° taper on its thread, which fits into the mounting hole (203).

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