Shock absorber capable of silencing

Abstract

The utility model relates to the technical field of shock absorber noise reduction, in particular to a shock absorber capable of silencing, which comprises a compression limiting block, a connecting rod and an outer cylinder, the connecting rod penetrates through the compression limiting block, the connecting rod is fixedly connected with the compression limiting block, the outer cylinder is sleeved with a protective cover abutting against the compression limiting block, and the outer cylinder is fixedly connected with the connecting rod. The connecting rod penetrates through the protective cover and extends into the outer cylinder, a plurality of protrusions are formed on the end face of the protective cover in a protruding mode, and a silencing channel is formed between every two adjacent protrusions. The multiple protrusions are formed on the end face of the protective cover in the protruding mode, the noise reduction channels are formed between the adjacent protrusions, noise sound waves generated when the compression limiting block collides with the protective cover are continuously reflected and refracted in the noise reduction channels, the noise sound waves are interfered and counteracted, the sound waves are effectively dispersed, and then noise is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of shock absorbers, and in particular to a sound-absorbing shock absorber. BACKGROUND

[0002] Shock absorbers are widely used on automobiles to suppress the oscillation of springs when rebounding after absorbing shocks, to attenuate the vibration and impact caused by road unevenness, and to improve the riding comfort of automobiles.

[0003] The shock absorber comprises an upper support assembly, a connecting rod and a shock absorber outer cylinder, the connecting rod is fixed with a piston at the bottom, the connecting rod drives the piston to make a reciprocating linear motion in the shock absorber outer cylinder under the action of the upper support assembly, the bottom surface of the upper support assembly is provided with a compression limiting block, the connecting rod passes through the compression limiting block and is fixed with the upper support assembly, a protective cover is fixed on the shock absorber outer cylinder, when the shock absorber is compressed, the upper support assembly drives the connecting rod to move into the shock absorber outer cylinder, and the compression limiting block collides with the protective cover to generate noise.

[0004] The end surface of the existing protective cover is a plane, the collision surface of the compression limiting block and the protective cover is large, the gas between the compression limiting block and the protective cover is compressed, and thus noise is generated.

[0005] Therefore, a sound-absorbing shock absorber is needed to solve the problem of noise generated by the collision of the compression limiting block and the protective cover, so as to reduce the generation of noise. CONTENT OF THE INVENTION

[0006] In order to reduce the noise generated by the collision of the compression limiting block and the protective cover, the application provides a sound-absorbing shock absorber.

[0007] The application provides a sound-absorbing shock absorber, which adopts the following technical scheme:

[0008] The sound-absorbing shock absorber comprises a compression limiting block, a connecting rod and an outer cylinder, the connecting rod penetrates through the compression limiting block, the connecting rod is fixedly connected with the compression limiting block, a protective cover abutting against the compression limiting block is sleeved on the outer cylinder, the connecting rod penetrates through the protective cover and extends into the outer cylinder, the end surface of the protective cover is protruded and formed with a plurality of protrusions, and ananechoic channel is formed between adjacent protrusions.

[0009] When the connecting rod extends and retracts in the outer cylinder, the compression limiting block moves towards the outer cylinder along with the connecting rod, noise is generated by the collision of the compression limiting block and the protective cover, the end surface of the protective cover is protruded and formed with a plurality of protrusions, the collision surface of the end surface of the protective cover and the compression limiting block is reduced, ananechoic channel is formed between adjacent protrusions, the noise sound waves generated by the collision are continuously reflected and refracted in the anechoic channel, the noise sound waves are interfered and offset, the sound waves are effectively dispersed, and thus the noise is reduced.

[0010] Optionally, the silencing channel includes a radial channel and a circumferential channel that are interconnected. The radial channel is arranged radially along the end face of the protective cover, and the circumferential channel is arranged circumferentially along the end face of the protective cover.

[0011] By adopting the above technical solution, after noise is generated, it is continuously reflected and refracted in the radial and circumferential channels. The setting of the radial and circumferential channels enhances the tortuosity and interference of the sound during propagation, further enhancing the noise elimination effect of the noise reduction channel.

[0012] Optionally, the protrusions are prismatic in shape and are arranged radially and circumferentially along the end face of the protective cover.

[0013] By adopting the above technical solution, the protrusions are arranged radially and circumferentially along the end face of the protective cover. The impact surfaces of the protective cover and the compression limiting block are multiple and evenly distributed. When the protective cover impacts the compression limiting block, the pressure on the protective cover is more evenly distributed, reducing the deformation and vibration of the impact area, thereby reducing the decibel of the sound and also protecting the protective cover.

[0014] Optionally, the length of the protrusions arranged radially along the end face of the protective cover gradually increases from the center of the protective cover to the edge, and the protrusions arranged circumferentially along the end face of the protective cover are spaced apart and form a ring structure.

[0015] By adopting the above technical solution, the length of the protrusions arranged radially along the protective cover gradually increases from the center of the protective cover to the edge. The number of protrusions at the center of the protective cover is much greater than the number of protrusions at the edge of the protective cover, which in turn increases the number of noise reduction channels at the center of the protective cover. This facilitates the reflection and refraction of noise waves at the center of the protective cover. When the compression limiting block approaches the protective cover and impacts it, the gas between the compression limiting block and the protective cover is compressed. The increased number of noise reduction channels at the center of the protective cover facilitates the outward discharge of gas, thereby reducing noise.

[0016] Optionally, the protrusion has a polygonal cross-sectional shape along the radial direction of the protective cover.

[0017] By adopting the above technical solution, the cross-sectional shape of the protrusion along the radial direction of the protective cover is polygonal, which makes the silencing channel formed between adjacent protrusions more tortuous, further enhancing the reflection and refraction of noise waves in the silencing channel, increasing the interference of the silencing channel on noise waves, and thus further reducing noise.

[0018] Optionally, the end face of the protective cover is coated with a sound-absorbing coating.

[0019] By adopting the above technical solution, the end face of the protective cover is coated with a sound-absorbing coating. The sound-absorbing coating can effectively absorb sound waves and convert them into other forms of energy, thereby reducing the transmission of sound.

[0020] Optionally, the protective cover is an aluminum sound-absorbing cover.

[0021] By adopting the above technical solution, the aluminum sound-absorbing cover has a high density, which can reduce the propagation of sound waves and has a stable sound insulation effect. In addition, the surface of the aluminum sound-absorbing cover has smoothness and light reflection characteristics, which causes sound waves to be reflected and scattered, thereby reducing the propagation of echo and noise sound waves.

[0022] Optionally, the protective cover has a plurality of reinforcing ribs distributed circumferentially, extending upward along the axial direction of the protective cover.

[0023] By adopting the above technical solution, the setting of reinforcing ribs strengthens the axial strength of the surrounding area of ​​the protective cover, preventing damage to the protective cover after impact.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. A sound-absorbing channel is formed between adjacent protrusions. The impact noise waves are continuously reflected and refracted in the sound-absorbing channel, which interferes with and cancels the noise waves, effectively disperses the sound waves, and thus reduces the noise.

[0026] 2. The protrusions are arranged radially and circumferentially along the end face of the protective cover. The impact surfaces of the protective cover and the compression limiting block are multiple and evenly distributed. When the protective cover impacts the compression limiting block, the pressure on the protective cover is distributed more evenly, reducing the deformation and vibration of the impact area, thereby reducing the decibel of the sound and also protecting the protective cover.

[0027] 3. The length of the protrusions arranged radially along the protective cover gradually increases from the center to the edge of the protective cover. The number of protrusions at the center of the protective cover is much greater than that at the edge of the protective cover, which in turn results in a greater number of noise reduction channels at the center of the protective cover. This facilitates the reflection and refraction of noise waves at the center of the protective cover. When the compression limiting block approaches and impacts the protective cover, the gas between the compression limiting block and the protective cover is compressed. The increased number of noise reduction channels at the center of the protective cover facilitates the outward discharge of gas, thereby reducing noise. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this application;

[0029] Figure 2 This is a schematic diagram of the protective cover in Embodiment 1 of this application;

[0030] Figure 3 for Figure 2 An enlarged schematic diagram of section A in the middle is used to show the positional relationship between the radial channel and the circumferential channel;

[0031] Figure 4 This is a schematic diagram of the protective cover in Embodiment 2 of this application, used to show the location of the polygonal protrusions on the protective cover.

[0032] Reference numerals: 1. Vibration damper; 2. Upper support assembly; 3. Compression limit block; 4. Connecting rod; 5. Outer cylinder; 6. Protective cover; 7. Protrusion; 8. Silencing channel; 9. Radial channel; 10. Circumferential channel; 11. Reinforcing rib; 12. Through hole. Detailed Implementation

[0033] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0034] Example 1:

[0035] A noise-absorbing vibration damper, reference Figure 1 and Figure 2 The shock absorber 1 includes an upper support assembly 2, a compression limiting block 3, a connecting rod 4, and an outer cylinder 5 arranged sequentially from high to low. The compression limiting block 3 is fixedly connected to the bottom of the upper support assembly 2. In this embodiment, the compression limiting block 3 is welded to the upper support assembly 2. One end of the connecting rod 4 passes through the compression limiting block 3 and is fixedly connected to the bottom of the upper support assembly 2. A protective cover 6 is fixedly installed on the outer cylinder 5. The protective cover 6 covers the end face of the outer cylinder 5. The protective cover 6 has a through hole 12 for the connecting rod 4 to pass through. The other end of the connecting rod 4 passes through the protective cover 6 and extends into the outer cylinder 5. When the connecting rod 4 extends and retracts within the outer cylinder 5, the compression limiting block 3 moves toward the outer cylinder 5 along with the connecting rod 4. The compression limiting block 3 may collide with the protective cover 6, which will generate noise. Multiple protrusions 7 are formed on the end face of the protective cover 6, which reduces the impact area between the compression limiting block 3 and the protective cover 6. A noise-absorbing channel 8 is formed between adjacent protrusions 7. The noise-absorbing channel 8 interferes with the noise sound waves. The noise sound waves are continuously reflected and refracted within the noise-absorbing channel 8, effectively dispersing the sound waves and further reducing the noise.

[0036] refer to Figure 1 and Figure 3The protrusions 7 are prismatic in shape and arranged radially and circumferentially along the end face of the protective cover 6. When the compression limiting block 3 impacts the protective cover 6, the pressure on the protective cover 6 is dispersed, reducing vibration at the impact point and thus reducing noise. The protrusions 7 are arranged radially and circumferentially on the end face of the protective cover 6, so that the silencing channel 8 formed by the protrusions 7 has a radial channel 9 and a circumferential channel 10. The radial channel 9 is arranged radially along the end face of the protective cover 6, and the circumferential channel 10 is arranged circumferentially along the end face of the protective cover 6. The radial channel 9 and the circumferential channel 10 are connected, which enhances the tortuosity and interference of sound propagation in the silencing channel 8, further reducing noise. To reduce noise, the length of the protrusions 7 arranged radially along the end face of the protective cover 6 gradually increases from the center to the edge of the protective cover 6. The protrusions 7 arranged circumferentially along the end face of the protective cover 6 are spaced apart and form a ring structure, which makes the number of silencing channels 8 formed at the center of the protective cover 6 more, so that the noise sound waves at the center of the protective cover 6 can be reflected and refracted in the silencing channels 8. When the compression limiting block 3 collides with the protective cover 6, the gas between the compression limiting block 3 and the protective cover 6 is compressed, and the gas at the center of the protective cover 6 can be easily discharged outward through the radial channel 9 and the circumferential channel 10, which can further reduce noise.

[0037] refer to Figure 1 and Figure 2 The end face of the protective cover 6 is coated with a sound-absorbing coating. In this embodiment, the sound-absorbing coating is a polyurethane coating. The polyurethane coating has a large number of tiny pores. Sound waves enter the pores and rub and reflect against the material, thereby converting sound energy into heat energy. The heat is then transferred out through heat conduction, achieving a good sound absorption effect and further reducing the noise between the compression limiting block 3 and the protective cover 6. Moreover, the polyurethane coating has corrosion resistance and wear resistance, preventing wear on the sound-absorbing coating on the end face of the protective cover 6 after repeated impacts between the compression limiting block 3 and the protective cover 6, which would affect the sound absorption effect of the protective cover 6. The protective cover 6 is an aluminum sound-absorbing cover. The aluminum sound-absorbing cover has a high density and a stable sound insulation effect. The surface of the aluminum sound-absorbing cover has good smoothness and light reflection characteristics, which also helps to absorb sound, causing sound waves to be reflected and scattered, thereby reducing the propagation of echo and noise waves.

[0038] The implementation principle of Embodiment 1 of this application is as follows: When the connecting rod 4 moves in and out of the outer cylinder 5, the compression limiting block 3 moves toward the outer cylinder 5 along with the connecting rod 4. The compression limiting block 3 impacts the protective cover 6, generating noise. The end face of the protective cover 6 is provided with a plurality of protrusions 7 arranged radially and circumferentially along the end face of the protective cover 6. The impact surface between the end face of the protective cover 6 and the compression limiting block 3 is reduced. A noise reduction channel 8 is formed between adjacent protrusions 7. The noise reduction channel 8 includes a radial channel 9 arranged radially along the end face of the protective cover 6 and a circumferential channel 10 arranged circumferentially along the end face of the protective cover 6. The noise generated by the impact is continuously reflected and refracted in the radial channel 9 and the circumferential channel 10, which effectively reduces the noise. The end face of the protective cover 6 is coated with polyurethane coating. The protective cover 6 is an aluminum sound-absorbing cover, which further enhances the sound absorption effect of the protective cover 6.

[0039] Example 2:

[0040] refer to Figure 4 A noise-absorbing vibration damper, reference Figure 1 and Figure 2 The difference from Embodiment 1 is that the protective cover 6 is different from that in Embodiment 1. The cross-section of the protrusion 7 on the end face of the protective cover 6 along the radial direction of the protective cover 6 is polygonal. In this embodiment, the cross-sectional shape of the protrusion 7 is hexagonal. The noise reduction channel 8 is arranged between adjacent protrusions 7. The protective cover 6 has a plurality of reinforcing ribs 11 distributed circumferentially. The reinforcing ribs 11 are arranged along the axial direction of the protective cover 6, which strengthens the axial strength of the protective cover 6.

[0041] The implementation principle of Embodiment 2 of this application is as follows: the cross-sectional shape of the protrusion 7 is polygonal, and the sound-absorbing channel 8 formed between adjacent protrusions 7 is also polygonal, which enhances the tortuosity of sound reflection and refraction in the sound-absorbing channel 8, further reducing noise. The reinforcing rib 11 further strengthens the axial strength of the protective cover 6.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A noise-absorbing vibration damper, comprising a compression limiting block (3), a connecting rod (4), and an outer cylinder (5), wherein the connecting rod (4) passes through the compression limiting block (3) and is fixedly connected to the compression limiting block (3), a protective cover (6) that abuts against the compression limiting block (3) is fitted on the outer cylinder (5), and the connecting rod (4) extends into the outer cylinder (5) through the protective cover (6), characterized in that: The protective cover (6) has multiple protrusions (7) on its end face, and a sound-absorbing channel (8) is formed between adjacent protrusions (7).

2. The noise-absorbing vibration damper according to claim 1, characterized in that: The noise reduction channel (8) includes a radial channel (9) and a circumferential channel (10) that are interconnected. The radial channel (9) is arranged radially along the end face of the protective cover (6), and the circumferential channel (10) is arranged circumferentially along the end face of the protective cover (6).

3. The noise-absorbing vibration damper according to claim 2, characterized in that: The protrusion (7) is prismatic in shape and is arranged radially and circumferentially along the end face of the protective cover (6).

4. A noise-absorbing vibration damper according to claim 3, characterized in that: The length of the protrusions (7) arranged radially along the end face of the protective cover (6) gradually increases from the center of the protective cover (6) to the edge. The protrusions (7) arranged circumferentially along the end face of the protective cover (6) are spaced apart and form a ring structure.

5. A noise-absorbing vibration damper according to claim 1, characterized in that: The protrusion (7) has a polygonal cross-sectional shape along the radial direction of the protective cover (6).

6. A noise-absorbing vibration damper according to claim 1, characterized in that: The end face of the protective cover (6) is coated with a sound-absorbing coating.

7. A noise-absorbing vibration damper according to claim 1, characterized in that: The protective cover (6) is an aluminum sound-absorbing cover.

8. A noise-absorbing vibration damper according to claim 5, characterized in that: The protective cover (6) has a plurality of reinforcing ribs (11) that extend upward along the axial direction of the protective cover (6).

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