Precise noise reduction shell of automobile gearbox

Abstract

The utility model relates to the technical field of automobile gearboxes, in particular to an automobile gearbox precise noise reduction shell which comprises an outer shell body, an inner shell body is arranged in the outer shell body, a cavity is formed between the inner shell body and the outer shell body, a plurality of supporting blocks are arranged in the cavity, a sound insulation plate is fixedly connected to the inner wall of the inner shell body, and a sound insulation cavity is formed in the sound insulation plate. A plurality of silencing holes are formed in the sound insulation plate and communicate with the sound insulation cavity, a plurality of sets of waved plates are arranged in the sound insulation cavity, and the surfaces of the multiple sets of waved plates are wrapped with sound absorption pads.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of automobile gearbox, in particular to a precise noise reduction casing of automobile gearbox. BACKGROUND

[0002] With the rapid development of automobile industry, the noise reduction problem of automobile gearbox is paid more and more attention. After long time use, the automobile gearbox often has the problem of excessive noise, which not only affects the driving experience of the driver, but also may have adverse effects on the overall performance of the vehicle. Therefore, it is particularly important to develop a noise reduction casing that can effectively reduce the noise of the automobile gearbox. SUMMARY

[0003] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the utility model is to provide a precise noise reduction casing of automobile gearbox, which has the advantage of solving the problem raised in the background art.

[0004] The above technical purpose of the utility model is realized by the following technical scheme:

[0005] A precise noise reduction casing of automobile gearbox, comprising an outer casing, an inner casing is arranged inside the outer casing, a cavity is arranged between the inner casing and the outer casing, a plurality of supporting blocks are arranged in the cavity, a sound insulation board is fixedly connected to the inner wall of the inner casing, a sound insulation cavity is formed in the sound insulation board, a plurality of sound holes are formed in the sound insulation board, the plurality of sound holes are in communication with the sound insulation cavity, a plurality of wave plates are arranged in the sound insulation cavity, and sound absorption pads are wrapped around the surfaces of the plurality of wave plates.

[0006] By adopting the above technical scheme, the cavity arranged between the outer casing and the inner casing can play a moving sound insulation effect, effectively disperse sound waves and reduce the propagation of noise. When the gearbox is working, the noise generated will enter the sound insulation cavity of the sound insulation board through the plurality of sound holes on the sound insulation board. At this time, the noise can be reduced by the cooperation of the plurality of wave plates in the sound insulation cavity and the sound absorption pads wrapped around the wave plates. The wave plates can effectively disperse and reflect sound waves due to their unique wave shape. When the sound waves hit the wave plates, the sound waves will be constantly reflected and refracted on the uneven surface, making the propagation path of the sound complex. In this process, the energy of the sound waves will be constantly consumed, and the intensity of the noise will be greatly reduced.

[0007] Further provided: the outer casing is a double-layer hollow structure, and the outer casing is wrapped with a sound insulation layer.

[0008] By adopting the above technical scheme, the cooperation of the double-layer hollow structure of the outer casing and the sound insulation layer can reduce the propagation of noise, thereby achieving a certain noise reduction effect.

[0009] Further arrangement: the adjacent side in the cavity is fixedly connected with sound insulation cotton.

[0010] By adopting the above technical scheme, through the cooperation of the cavity and the sound insulation cotton arranged in the cavity, the propagation of noise can be slowed down, and the noise reduction effect can be achieved.

[0011] Further arrangement: the sound insulation board is provided with a plurality of U-shaped protrusions away from the inner shell, and the surfaces of the U-shaped protrusions are wrapped with sound-absorbing cotton.

[0012] By adopting the above technical scheme, when the sound wave hits the U-shaped protrusion, the sound wave will be continuously reflected and refracted on the surface of the U-shaped protrusion, so that the propagation path of the sound becomes complex, and in this process, the energy of the sound wave is continuously consumed, and the intensity of the noise is greatly reduced.

[0013] Further arrangement: the sound reduction hole is provided with a port area smaller than the outer port area on the side close to the sound insulation cavity.

[0014] By adopting the above technical scheme, the main function of the sound reduction hole is to reduce the propagation of noise, and when the sound wave enters the sound reduction hole, the design of the sound reduction hole with one end large and the other end small can provide a gradual transition area to enter the sound insulation cavity, and reflection, refraction and interference phenomena will occur, which will consume the energy of the sound wave, thereby reducing the intensity of the noise.

[0015] Further arrangement: the inner shell is a double-layer space structure.

[0016] By adopting the above technical scheme, the inner shell designed by the double-layer space structure can achieve a certain noise reduction effect.

[0017] In summary, the utility model has the following beneficial effects:

[0018] The cavity arranged between the outer shell and the inner shell can achieve the moving sound insulation effect, can effectively disperse the sound wave, and reduce the propagation of noise, and when the gearbox is working, the noise generated by the gearbox enters the sound insulation cavity of the sound insulation board through the plurality of sound reduction holes on the sound insulation board, and at this time, the noise can achieve a certain noise reduction effect through the cooperation of the plurality of wave plates in the sound insulation cavity and the sound-absorbing pads wrapped on the wave plates, and the wave plates can effectively disperse and reflect the sound wave due to the unique wave shape, and when the sound wave hits the wave plate, the sound wave will be continuously reflected and refracted on the uneven surface, so that the propagation path of the sound becomes complex, and in this process, the energy of the sound wave is continuously consumed, and the intensity of the noise is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application, but do not constitute improper limitations on the present application, and in the drawings:

[0020] Figure 1 is the front view of the present application;

[0021] Figure 2 is the front view structural schematic diagram of the present application.

[0022] In the drawings, 1, outer shell; 2, inner shell; 3, cavity; 4, support block; 5, sound insulation board; 6, sound insulation cavity; 7, sound hole; 8, wave board; 9, sound absorption pad; 10, sound insulation layer; 11, sound insulation cotton; 12, U-shaped lug; 13, sound absorption cotton. DETAILED DESCRIPTION

[0023] The foregoing and other technical contents, features and effects of the present application will be described below in conjunction with the accompanying drawings. Figure 1 to the accompanying drawings Figure 2 The detailed description of the embodiments will be clearly presented. The structural contents mentioned in the following embodiments are all referred to the drawings.

[0024] The exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0025] Embodiment 1: a precise noise reduction shell of an automobile gearbox, as shown in Figure 1 , 2 , comprising an outer shell 1, the outer shell 1 is a double-layer hollow structure, the outer shell 1 is wrapped with a sound insulation layer 10, the inner shell 2 is arranged in the outer shell 1, the cavity 3 is arranged between the inner shell 2 and the outer shell 1, a plurality of support blocks 4 are arranged in the cavity 3, the sound insulation cotton 11 is fixedly connected to the adjacent side of the cavity 3, the sound insulation board 5 is fixedly connected to the inner wall of the inner shell 2, the sound insulation cavity 6 is arranged in the sound insulation board 5, a plurality of sound holes 7 are arranged on the sound insulation board 5, the plurality of sound holes 7 are communicated with the sound insulation cavity 6, the sound hole 7 is close to the sound insulation cavity 6, the port area of one side is smaller than that of the other side, a plurality of wave boards 8 are arranged in the sound insulation cavity 6, and the sound absorption pad 9 is wrapped on the surface of the plurality of wave boards 8.

[0026] As shown in Figure 2 , the sound insulation board 5 is provided with a plurality of U-shaped lugs 12 away from the inner shell 2, and the sound absorption cotton 13 is wrapped on the surface of the plurality of U-shaped lugs 12.

[0027] In the embodiment of the utility model, when the gearbox is working, the noise produced will impact on the multiple U-shaped lugs 12 on the soundproof board 5, the sound wave will be reflected and refracted on the surface of the U-shaped lugs 12 constantly, the propagation path of the sound becomes complex, in this process, the energy of the sound wave will be consumed constantly, and the intensity of the noise will be greatly weakened, the remaining sound wave enters the multiple sound absorbing holes 7, and then enters the soundproof cavity 6 in the soundproof board 5, at this time, the multiple wave plates 8 in the soundproof cavity 6 and the sound absorbing pads 9 wrapped on the wave plates 8 can play a certain noise reduction effect through the cooperation, the wave plate 8 can effectively disperse and reflect the sound wave due to the unique wave shape, when the sound wave impacts on the wave plate 8, the sound wave will be reflected and refracted on the uneven surface constantly, the propagation path of the sound becomes complex, in this process, the energy of the sound wave will be consumed constantly, and the intensity of the noise will be greatly weakened.

[0028] The above is the further detailed description of the utility model made in combination with the specific implementation, and the specific implementation of the utility model cannot be limited to this; for the person skilled in the art and the related technical field of the utility model, the expansion, operation method and data replacement made on the basis of the technical scheme idea of the utility model should be within the protection scope of the utility model.

Claims

1. A precise noise reduction shell of an automobile gearbox, comprising an outer shell (1), characterized in that: The inner cavity (3) is provided with a plurality of supporting blocks (4), the inner wall of the inner shell (2) is fixedly connected with a sound insulation board (5), the sound insulation board (5) is provided with a sound insulation cavity (6), a plurality of sound holes (7) are formed in the sound insulation board (5), the plurality of sound holes (7) are communicated with the sound insulation cavity (6), the sound insulation cavity (6) is provided with a plurality of wave plates (8), and the surface of the plurality of wave plates (8) is wrapped with sound-absorbing pads (9).

2. The precise noise reduction shell of an automobile gearbox according to claim 1, characterized in that: The outer shell (1) is a double-layer hollow structure, and the outer shell (1) is wrapped with a sound insulation layer (10).

3. The precise noise reduction shell of an automobile gearbox according to claim 1, characterized in that: The adjacent side of the inner cavity (3) is fixedly connected with sound insulation cotton (11).

4. The precise noise reduction shell of an automobile gearbox according to claim 1, characterized in that: The side, away from the inner shell (2), of the sound insulation board (5) is provided with a plurality of U-shaped protrusions (12), and the surface of the plurality of U-shaped protrusions (12) is wrapped with sound-absorbing cotton (13).

5. The precise noise reduction shell of an automobile gearbox according to claim 1, characterized in that: The port area of the sound hole (7) on the side close to the sound insulation cavity (6) is smaller than the port area on the outer side.

6. The precise noise reduction shell of an automobile gearbox according to claim 1, characterized in that: The inner shell (2) is a double-layer hollow structure.

Images