Elastomeric bushing with pre-tensioning function

Abstract

This utility model relates to the field of elastomer bushing technology, specifically an elastomer bushing with a pre-tightening function. It includes a shell, an inner bushing, and an elastic element. The inner bushing is disposed inside the shell, and the elastic element is fixedly connected between the shell and the inner bushing. A connecting buffer sleeve is fixedly snapped onto one end of the outer surface of the shell, and a fastening device is fixedly connected to the other end of the outer surface of the shell. A fixing ring is fixedly connected to the outer surface of the shell, and the fixing ring and the connecting buffer sleeve are interlocked. The fastening device includes a connecting ring sleeved on the outer surface of the shell, with a connecting hole at the interface of the connecting ring, and a fixing bolt threaded into the connecting hole. This utility model, by incorporating a fastening device, allows for the reduction of the interface gap of the connecting ring by tightening the fixing bolt when the elastic element develops gaps due to fatigue. This effectively solves the problem of loosening that occurs easily after long-term use of existing bushings, improving connection stability and service life.

Description

Technical Field

[0001] This utility model relates to the field of elastomer bushing technology, and in particular to an elastomer bushing with a pre-tightening function. Background Technology

[0002] Bushings are fittings used on the outside of mechanical parts to achieve functions such as sealing and wear protection. They refer to rings that act as gaskets. In mechanical systems, the holes between shafts and housings are high-frequency mating structures (such as motor shafts and end caps, automobile suspension pins and swing arm holes).

[0003] In existing technologies, some devices, due to continuous cyclic loads, will gradually exhibit fatigue aging of the elastomer material, specifically manifested as a decrease in elastic modulus and increased stress relaxation, eventually leading to irreversible plastic deformation. This deformation will directly disrupt the tight fit between the inner bushing and the outer shell, resulting in assembly gaps at the micrometer or even millimeter level. As the gaps continue to widen, it will not only cause loosening of mechanical connections but also generate significant abnormal noise during equipment operation, seriously affecting the operational stability and service life of the equipment. Utility Model Content

[0004] The purpose of this invention is to solve the problem that existing technologies lack an effective pre-tightening mechanism and are prone to loosening after long-term use, and to propose an elastomer bushing with a pre-tightening function.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an elastomer bushing with a pre-tightening function, comprising a shell, an inner bushing, and an elastic element, wherein the inner bushing is disposed inside the shell, the elastic element is fixedly connected between the shell and the inner bushing, a connecting buffer sleeve is fixedly snapped onto one end of the outer surface of the shell, a fastening device is fixedly connected to the other end of the outer surface of the shell, and a fixing ring is fixedly connected to the outer surface of the shell, wherein the fixing ring and the connecting buffer sleeve are interlocked.

[0006] The fastening device includes a connecting ring fitted onto the outer surface of the housing, and a connecting hole is provided at the interface of the connecting ring, with a fixing bolt threaded into the internal thread of the connecting hole.

[0007] Furthermore, the outer surface of the outer shell is provided with strip grooves, which are distributed circumferentially on the outer surface of the outer shell.

[0008] Furthermore, the connecting buffer sleeve includes a ring that engages with the fixing ring, the inner wall of the ring is provided with a buffer assembly, and the outer surface of the ring is provided with a snap-fit ​​block.

[0009] Furthermore, the buffer assembly includes a spring fixedly connected to the inner wall of the ring, and a buffer block is fixedly connected to the end of the spring away from the ring.

[0010] Furthermore, the outer wall of the fixing ring is fixedly connected with a snap-fit ​​groove, and the snap-fit ​​block and the snap-fit ​​groove are snapped together.

[0011] Furthermore, the outer wall of the fixing ring is fixedly connected with a snap-fit ​​groove, and the snap-fit ​​block and the snap-fit ​​groove are snapped together.

[0012] Furthermore, a sealing strip is fixedly connected to the end of the ring away from the fixed ring.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0014] 1. In this utility model, by setting a fastening device and cooperating with the strip groove, the pre-tightening force can be adjusted. When the elastic element has gaps due to fatigue, the interface gap of the connecting ring can be reduced by tightening the fixing bolt, which forces the outer shell to slightly shrink radially along the strip groove, thereby squeezing the elastic element to eliminate the gaps. This effectively solves the problem of loosening of existing bushings after long-term use and improves connection stability and service life.

[0015] 2. In this utility model, by setting up a connecting buffer sleeve, the elastic element in the device acts as the main buffer component, which can absorb most of the conventional vibrations; when encountering high-frequency vibrations or impact loads, the spring in the buffer assembly can further deform and buffer, while the buffer block avoids rigid contact, thus solving the problems of the existing bushing buffer structure being simple and having poor shock absorption effect under complex working conditions, and reducing equipment operating noise and component wear. Attached Figure Description

[0016] Figure 1 A three-dimensional structural diagram of an elastic bushing with pre-tightening function is provided for this utility model;

[0017] Figure 2 This utility model provides a schematic diagram of the split structure of an elastomer bushing with pre-tightening function;

[0018] Figure 3 This utility model provides a structural schematic diagram of a fastening device in an elastomer bushing with a pre-tightening function;

[0019] Figure 4 This utility model provides a cross-sectional structural diagram of an elastomer bushing with pre-tightening function;

[0020] Figure 5 This utility model relates to an elastomer bushing with a pre-tightening function. Figure 4 Enlarged diagram of point A.

[0021] Legend:

[0022] 1. Outer shell; 11. Strip groove; 12. Fixing ring; 13. Snap-fit ​​groove; 2. Inner liner; 3. Elastic element; 4. Connecting buffer sleeve; 41. Ring; 42. Buffer assembly; 421. Spring; 422. Buffer block; 43. Snap-fit ​​block; 44. Sealing strip; 5. Fastening device; 51. Connecting ring; 52. Connecting hole; 53. Fixing bolt. Detailed Implementation

[0023] Please see Figure 1-5 This utility model provides a technical solution: an elastic bushing with pre-tightening function, including a shell 1, an inner bushing 2 and an elastic element 3. The inner bushing 2 is disposed inside the shell 1. The elastic element 3 is fixedly connected between the shell 1 and the inner bushing 2. A connecting buffer sleeve 4 is fixedly snapped onto one end of the outer surface of the shell 1. A fastening device 5 is fixedly connected to the other end of the outer surface of the shell 1. A fixing ring 12 is fixedly connected to the outer surface of the shell 1. The fixing ring 12 and the connecting buffer sleeve 4 are snapped together.

[0024] The specific setup and function of the connecting buffer sleeve 4 and fastening device 5 will be explained below.

[0025] In this embodiment: the fastening device 5 includes a connecting ring 51 sleeved on the outer surface of the housing 1, and a connecting hole 52 is provided at the interface of the connecting ring 51. A fixing bolt 53 is threadedly connected inside the connecting hole 52.

[0026] The effects achieved by the above components are as follows: the pre-tightening function is realized through the combination of the connecting ring 51 and the fixing bolt 53. When the elastic element 3 deforms and gaps due to fatigue aging, tightening the fixing bolt 53 can reduce the opening distance of the connecting ring 51, so that the connecting ring 51 generates a radial clamping force on the shell. At the same time, the connecting ring 51 is made of spring steel 421, which has a certain elastic deformation capacity and can adapt to the slight shrinkage of the shell, avoiding excessive compression and damage to the shell. Finally, the gap of the elastic element 3 is eliminated by the shrinkage of the shell, ensuring the tightness of the bushing connection for a long time and solving the problem of loosening of the existing bushing after long-term use.

[0027] Specifically, the outer surface of the outer shell 1 is provided with strip grooves 11, which are distributed circumferentially on the outer surface of the outer shell 1.

[0028] The effects achieved by the above components are as follows: the strip groove 11 provides radial deformation space for the outer shell 1. When the fastening device 5 applies a clamping force, the outer shell 1 can slightly contract along the strip groove 11, ensuring that the outer shell 1 can uniformly compress the elastic element 3 and avoid local overload of the elastic element 3 due to excessive rigidity of the outer shell 1. At the same time, the strip groove 11 can reduce the overall weight of the outer shell 1, achieving lightweighting while ensuring strength. Moreover, the spaced distribution design can make the outer shell 1 uniformly stressed when it contracts, avoiding excessive local deformation.

[0029] Specifically, the connecting buffer sleeve 4 includes a ring 41 that snaps into the fixing ring 12. The inner wall of the ring 41 is provided with a buffer assembly 42, and the outer surface of the ring 41 is provided with a snap-fit ​​block 43. The buffer assembly 42 includes a spring 421 that is fixedly connected to the inner wall of the ring 41. The end of the spring 421 away from the ring 41 is fixedly connected to a buffer block 422.

[0030] The aforementioned components achieve the following effects: forming a dual buffer structure of elastic element 3 and buffer assembly 42. Elastic element 3 serves as the main buffer layer, absorbing normal vibrations and impacts during equipment operation. When encountering high-frequency vibrations or instantaneous impact loads, the spring 421 in the buffer assembly 42 can be further compressed and deformed, absorbing excess vibration energy through elastic potential energy conversion. At the same time, the buffer block 422 prevents the spring 421 from directly and rigidly contacting the outer shell 1, preventing abnormal metal collision noises. In addition, the ring 41 is positioned with the fixing ring 12 through the snap-fit ​​block 43, ensuring that the buffer assembly 42 can accurately correspond to the force points of the outer shell 1, improving buffering efficiency.

[0031] Specifically, the outer wall of the fixing ring 12 is fixedly connected with a snap-fit ​​groove 13, and the snap-fit ​​block 43 is snapped into the snap-fit ​​groove 13. The buffer assembly 42 is distributed circumferentially on the inner wall of the ring 41.

[0032] The above components achieve the following effects: the snap-fit ​​connection between the two components enables precise positioning of the buffer sleeve 4 and the outer shell 1, preventing the buffer sleeve from rotating circumferentially or sliding axially during operation; at the same time, the snap-fit ​​structure requires no additional fasteners, making assembly and disassembly convenient, and the buffer sleeve can be quickly separated for inspection or replacement during subsequent maintenance, improving operational convenience.

[0033] Specifically, further, the outer wall of the fixing ring 12 is fixedly connected with a snap-fit ​​groove 13, and the snap-fit ​​block 43 is snapped into the snap-fit ​​groove 13.

[0034] The effect achieved by the above components is to realize the precise positioning and installation of the connecting buffer sleeve 4 and the outer shell 1. During installation, simply align the snap-fit ​​block 43 of the ring 41 with the snap-fit ​​groove 13 of the fixing ring 12 and push it in axially to complete the positioning. No additional measuring tools are required, thus improving assembly efficiency.

[0035] Specifically, the buffer components 42 are distributed circumferentially on the inner wall of the ring 41.

[0036] The effect achieved by the above components is that the spacing allows the buffering force to be evenly covered on the inner wall of the ring 41. No matter which direction the external vibration is transmitted to the bushing, the corresponding buffer component 42 is synchronously stressed, avoiding overload damage to the local buffer component 42, ensuring the all-round buffering effect of the bushing, and further improving the impact resistance.

[0037] Specifically, the end of the ring 41 away from the fixed ring 12 is fixedly connected to the sealing strip 44.

[0038] The above components achieve the following effects: they provide a sealing and protective function for the bushing, and the sealing strip 44 can fit tightly against the outer wall of the outer shell 1 and the external installation structure, preventing dust, moisture, oil and other pollutants from entering the bushing; they prevent the elastic element 3 from aging and losing elasticity due to pollutant corrosion, and at the same time prevent the metal surfaces of the outer shell 1 and the inner bushing 2 from rusting, significantly improving the environmental adaptability and service life of the bushing.

[0039] Working principle: During assembly, the elastic element 3 is first fixed between the outer shell 1 and the inner bushing 2. Then, the connecting ring 51 of the fastening device 5 is put on the outer surface of the outer shell 1. By turning the fixing bolt 53 in the connecting hole 52, the tightness of the connecting ring 51 is adjusted to apply a pre-tightening force to the outer shell 1, so that the outer shell 1 forms a stable pre-pressure on the inner bushing 2 and the elastic element 3, eliminating the assembly gap. Then, the snap-fit ​​block 43 of the connecting buffer sleeve 4 is snapped into the snap-fit ​​groove 13 of the fixing ring 12 to complete the fixation of the buffer sleeve and the outer shell 1. At this time, the sealing strip 44 seals the end of the ring 41 to prevent impurities from entering.

[0040] During operation, when the bushing is subjected to external vibration or impact, the vibration is first transmitted to the ring 41 connecting the buffer sleeve 4. The buffer components 42 distributed circumferentially on the inner wall of the ring 41 respond synchronously. The spring 421 elastically stretches and absorbs part of the impact force, and the buffer block 422 bears and disperses the remaining stress. At the same time, the strip groove 11 of the outer shell 1 assists the outer shell 1 to deform slightly, adapting to the force changes of the elastic element 3 and avoiding rigid damage. The pre-tightening force of the fastening device 5 always maintains the stable force state of the elastic element 3, preventing relative displacement of the components. Finally, the bushing achieves the dual functions of pre-tightening and vibration buffering, ensuring stable operation of the equipment.

Claims

1. An elastomer bushing with a pre-tightening function, comprising a shell (1), an inner bushing (2), and an elastic element (3), characterized in that: The inner liner (2) is disposed inside the outer shell (1), the elastic element (3) is fixedly connected between the outer shell (1) and the inner liner (2), a connecting buffer sleeve (4) is fixedly snapped onto one end of the outer surface of the outer shell (1), a fastening device (5) is fixedly connected to the other end of the outer surface of the outer shell (1), a fixing ring (12) is fixedly connected to the outer surface of the outer shell (1), and the fixing ring (12) and the connecting buffer sleeve (4) are snapped together; The fastening device (5) includes a connecting ring (51) sleeved on the outer surface of the outer shell (1), and a connecting hole (52) is provided at the interface of the connecting ring (51), and a fixing bolt (53) is threaded inside the connecting hole (52).

2. The elastomer bushing with pre-tightening function according to claim 1, characterized in that: The outer surface of the outer shell (1) is provided with a strip groove (11), and the strip groove (11) is distributed in a circumferentially spaced manner on the outer surface of the outer shell (1).

3. The elastomeric bushing with pre-tightening function according to claim 1, characterized in that: The connecting buffer sleeve (4) includes a ring (41) that engages with the fixing ring (12). The inner wall of the ring (41) is provided with a buffer assembly (42), and the outer surface of the ring (41) is provided with a snap-fit ​​block (43).

4. The elastomeric bushing with pre-tightening function according to claim 3, characterized in that: The buffer assembly (42) includes a spring (421) fixedly connected to the inner wall of the ring (41), and a buffer block (422) is fixedly connected to one end of the spring (421) away from the ring (41).

5. An elastomer bushing with pre-tightening function according to claim 3, characterized in that: The outer wall of the fixing ring (12) is fixedly connected with a snap-fit ​​groove (13), and the snap-fit ​​block (43) is snapped into the snap-fit ​​groove (13).

6. An elastomer bushing with pre-tightening function according to claim 4, characterized in that: The buffer components (42) are distributed circumferentially on the inner wall of the ring (41).

7. An elastomer bushing with pre-tightening function according to claim 3, characterized in that: A sealing strip (44) is fixedly connected to the end of the ring (41) away from the fixed ring (12).

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