Soundproof cover

Abstract

To provide a soundproof cover that can be attached to a unit to be a noise source, suppressing rattle noise while also preventing damage to surrounding parts and deterioration of mounting strength.SOLUTION: An embodiment of the present invention is a soundproof cover equipped with a sound absorption layer, in which: a compressed portion is formed where the thickness is reduced at the portion of the sound absorption layer; and a fastening hole is provided at an approximate center of the compressed portion to secure the cover to a noise source using fastening components, with a groove extending from at least one surface of the compressed portion and forming an arc around the fastening hole so as to surround the fastening hole.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a soundproof cover attached to a unit that generates a noise source.

Background Art

[0002] A soundproof cover may be attached to a unit that generates a noise source such as a motor in order to suppress noise and the like generated by the vibration of the unit.

[0003] For example, Patent Document 1 describes an automotive insulator dash for suppressing the transmission of vibrations and noises such as those of an engine into a vehicle interior, which is provided with through-holes for passing through a shaft or the like. In the insulator dash described in Patent Document 1, a curved portion is provided in an annular shape so as to surround the through-hole, and it is described that the attachment workability and sound insulation performance of the insulator dash can be improved by being able to follow and deform to variations in the position of a shaft or the like passed through the through-hole.

[0004] Patent Document 2 describes a configuration in an interior material of an automobile having a through-hole, in which the through-hole of the insulator dash is surrounded by a bending groove in order to suppress the transmission of vibrations and noises.

[0005] Although not for suppressing vibrations and noises, Patent Document 3 describes a structure in a resin molded product having a member that interferes with a rigid body such as a metal member, in which a bellows portion is integrally molded around the insertion hole of the rigid body in the resin molded product to absorb the interference between the rigid body and the member.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0007] Generally, in a soundproof cover attached to a unit that becomes a noise source such as a motor, the vibration of the unit is transmitted to the soundproof cover through the fastening part of the soundproof cover for fixing to the unit. Therefore, rattling noise may occur due to the vibration of the soundproof cover.

[0008] Also, when the soundproof cover vibrates, the soundproof cover repeatedly contacts the surrounding parts, which may cause the surrounding parts to be damaged. Furthermore, since the unit and the soundproof cover vibrate respectively, there is also a possibility that the attachment strength at the fastening part of the soundproof cover for fixing to the unit may decrease.

[0009] The above Patent Documents 1-3 do not show the structure at the fastening part for fixing the soundproof cover to the unit.

[0010] The present invention has been made to solve the problems of the background art as described above, and an object thereof is to provide a soundproof cover attached to a unit that becomes a noise source, which can suppress the generation of rattling noise and also suppress the breakage of surrounding parts and the decrease in attachment strength.

Means for Solving the Problems

[0011] In order to achieve the above object, the soundproof cover of the present invention is a soundproof cover provided with a sound absorption layer, a crushed part with a reduced thickness is formed in a part of the sound absorption layer, and a fastening hole for fixing to a noise source using a fastening part is provided at substantially the center of the crushed part, a groove part protruding from at least one surface of the crushed part is formed in an arc shape so as to surround the fastening hole around the fastening hole.

Effects of the Invention

[0012] According to the present invention, a soundproof cover attached to a unit that becomes a noise source can be obtained, which suppresses the generation of rattling sounds and suppresses damage to peripheral components and a decrease in attachment strength.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0014] Next, the present invention will be described with reference to the drawings.

[0015] FIG. 1 is a side cross-sectional view showing a configuration example of the soundproof cover of the present embodiment. FIG. 2 is a plan view showing a configuration example of a fastening portion provided in the soundproof cover of the present embodiment, and FIG. 3 is a side cross-sectional view showing a configuration example of the fastening portion shown in FIG. 2. FIG. 4 is a plan view showing a configuration example of a bridging portion provided in the fastening portion shown in FIG. 2.

[0016] FIGS. 1 to 4 schematically show the components of the present invention and do not accurately show the dimensions, shapes, structures, positions, etc. of the components.

[0017] As shown in FIG. 1, the soundproof cover 1 has a base material 11 made of a soft material such as slab urethane or PET fiber, which serves as a sound-absorbing layer for absorbing vibration sounds, and surface layers 12 made of non-woven fabric or the like are laminated on both sides of the base material 11.

[0018] Conventional sound insulation covers are appropriately provided with fastening holes for fixing to the unit 3 that is the noise source using fastening parts such as clips, and the sound insulation cover is attached to the unit 3 by the fastening parts inserted into the fastening holes. In contrast, the sound insulation cover 1 of the present invention is provided with a fastening part 2 (see FIGS. 2 and 3) including a fastening hole, and is attached to the unit 3 that is the noise source via the fastening part 2. The shape of the sound insulation cover 1 may be determined according to the shape of the unit 3, and it may be any shape. Also, the fastening part 2 provided on the sound insulation cover 1 only needs to be provided at one or more locations, and may be provided at an appropriate location according to the shapes of the sound insulation cover 1 and the unit 3, as well as the thickness and size of the sound insulation cover 1, etc.

[0019] The surface layer 12 of the sound insulation cover 1 is not limited to non-woven fabric, and may be a resin such as polyethylene terephthalate (PET), for example. By providing the surface layer 12, the strength of the fastening hole with which the fastening part abuts and its surroundings is improved, and the sound insulation cover 1 can be fixed to the unit 3 with a fastening part such as a clip.

[0020] As shown in FIG. 2, the fastening part 2 has a crushed part 21 with a reduced thickness formed in a part of the sound absorption layer (sound insulation cover 1), a fastening hole 22 is provided at substantially the center of the crushed part 21, and a groove part 23 protruding from at least one surface of the crushed part 21 is formed in an arc shape so as to surround the fastening hole 22 around the fastening hole 22.

[0021] As shown in FIG. 2, the groove part 23 is formed, for example, in an annular shape so as to surround the periphery of the fastening hole 22. The groove part 23 may be formed in a spiral shape so as to surround the periphery of the fastening hole 22.

[0022] As shown in FIGS. 2 and 3, the groove part 23 includes a first groove part 24 formed so as to protrude from one surface of the crushed part 21 and a second groove part 25 formed so as to protrude from the other surface of the crushed part 21. The first groove part 24 and the second groove part 25 are formed continuously in the radial direction from the fastening hole 22.

[0023] In such a configuration, a groove portion 23 is formed in an annular shape or a spiral shape so as to surround the periphery of the fastening hole 22 in the fastening portion 2, and vibrations transmitted from the unit 3 that is a noise source to the soundproof cover 1 are absorbed by the groove portion 23. Therefore, the vibration of the soundproof cover 1 is suppressed, and damage such as cracking around the fastening hole 22 of the soundproof cover 1 is reduced. Further, since the vibration of the soundproof cover 1 is suppressed, a decrease in the mounting strength of the fastening portion 2 of the soundproof cover 1 for fixing to the unit 3 is also suppressed. Furthermore, since the vibration of the soundproof cover 1 is suppressed, the generation of rattling noise is also suppressed, and damage to the peripheral components due to repeated contact between the soundproof cover 1 and the peripheral components is also suppressed.

[0024] As shown in FIGS. 2 and 3, by providing the groove portion 23 with a first groove portion 24 and a second groove portion 25, the vibration absorption performance of vibrations transmitted from the unit 3 that is a noise source to the soundproof cover 1 is improved. In particular, by forming the first groove portion 24 and the second groove portion 25 continuously in the radial direction from the fastening hole 22, the points restricting the movement of the fastening portion 2 are reduced, so that the fastening portion 2 becomes more likely to move. Therefore, the vibration absorption performance of vibrations transmitted from the unit 3 to the soundproof cover 1 is further improved.

[0025] The protruding amounts and widths of the first groove portion 24 and the second groove portion 25 may be the same or different. When the protruding amounts and widths of the first groove portion 24 and the second groove portion 25 are the same, the manufacturing of the fastening portion 2 becomes easier than in a configuration where the protruding amounts and widths are different. When the continuously formed first groove portion 24 and second groove portion 25 are taken as a set of groove pairs, the groove portion 23 may be configured to include a plurality of sets of groove pairs.

[0026] The protruding amount (depth) of the groove portion 23 may be larger than the thickness of the crushed portion 21. For example, when the thickness of the crushed portion 21 is 1.0 mm, the protruding amount of the groove portion 23 may be larger than 1.0 mm, and preferably 1.5 mm or more. In this way, if the protruding amount of the groove portion 23 is made larger than the thickness of the crushed portion 21, it becomes possible to sufficiently absorb the vibrations generated in the unit 3 that is a noise source.

[0027] On the one hand, when the protruding amount of the groove portion 23 increases, due to manufacturing reasons, the width of the groove portion 23 (the radial width from the fastening hole 22) also tends to increase, so the space of the groove portion 23 increases. In addition, since the soundproof cover 1 is fixed to the unit 3 that becomes the noise source only by the fastening component 26 such as a clip inserted into the fastening hole 22 (see FIG. 3), the soundproof cover 1 swings through the groove portion 23. Therefore, when the protruding amount of the groove portion 23 increases, the amount by which the soundproof cover 1 swings also increases. Therefore, it is preferable that the protruding amount of the groove portion 23 is smaller than the thickness of the portion around the crushed portion 21 (fastening portion 2) in the soundproof cover 1 (hereinafter referred to as "general portion 27"). For example, when the thickness of the general portion 27 is 7.0 mm, the protruding amount of the groove portion 23 may be smaller than 7.0 mm, preferably 5.0 mm or less, and more preferably 3.0 mm or less. By setting the protruding amount of the groove portion 23 in this way, it is possible to achieve both vibration absorption by the groove portion 23 and space saving.

[0028] In addition, in the configuration in which the groove portion 23 is simply formed in an annular shape or a spiral shape, as described above, since the soundproof cover 1 is fixed to the unit 3 that becomes the noise source only by the fastening component 26 inserted into the fastening hole 22, the soundproof cover 1 swings unstably through the groove portion 23. Therefore, as shown in FIG. 4, the groove portion 23 may be provided with a plurality of bridging portions 28 that do not protrude from the surface of the crushed portion 21. Since the groove portion 23 has the first groove portion 24 and the second groove portion 25, the bridging portions 28 may be provided in the first groove portion 24 and the second groove portion 25, respectively.

[0029] FIG. 4 shows a configuration example in which two bridging portions 28 are provided in each of the first groove portion 24 and the second groove portion 25. In FIG. 4, the two bridging portions 28 of the first groove portion 24 are arranged at positions facing each other, and the two bridging portions 28 of the second groove portion 25 are also arranged at positions facing each other. Further, in FIG. 4, the bridging portion 28 provided in the first groove portion 24 and the bridging portion 28 provided in the second groove portion 25 are arranged so as to be orthogonal to each other. The bridging portion 28 provided in the groove portion 23 is not limited to the arrangement example shown in FIG. 4, and the number of bridging portions 28 may be any number as long as the periphery of the fastening hole 22 can be supported with an equal force, and they may be arranged in any manner. For example, when three or more bridging portions 28 are provided in the first groove portion 24 and the second groove portion 25, the bridging portions 28 are provided at positions corresponding to the corners of a regular polygon inscribed in the annular first groove portion 24, respectively, and the bridging portions 28 are provided at positions corresponding to the corners of a regular polygon inscribed in the annular second groove portion 25, respectively. A configuration can be considered.

[0030] The bridging portion 28 connects the crushing portion 21 and the second groove portion 25 in a plane in a part of the first groove portion 24, and connects the first groove portion 24 and the general portion 27 in a plane in a part of the second groove portion 25, thereby reinforcing the connection between the fastening portion 2 and the general portion 27. The bridging portion 28 may be provided when the shaking movement of the soundproof cover 1 is large or when the vibration of the soundproof cover 1 is large (the acceleration is large). When the frequency band of the vibration of the soundproof cover 1 to be reduced is known to some extent, the number and installation position of the bridging portions 28 may be set according to the frequency band.

[0031] Furthermore, in the first groove portion 24 and the second groove portion 25, for example, if the positions where the bridging portions 28 are provided are aligned (arranged on the same straight line), it is also possible to control the vibration direction and suppress resonance (sympathetic vibration) and the like.

[0032] According to the present invention, the fastening portion 2 provided with the groove portion 23 is provided in the soundproof cover 1, and the soundproof cover 1 is attached to the unit 3 that is a noise source through the fastening portion 2, so that the vibration transmitted from the unit 3 to the soundproof cover 1 is absorbed by the groove portion 23. Therefore, the vibration of the soundproof cover 1 is suppressed, the generation of rattling noise is suppressed, and the damage of the peripheral components due to the repeated contact between the soundproof cover 1 and the peripheral components is also suppressed. Furthermore, by suppressing the vibration of the soundproof cover 1, a decrease in the attachment strength of the fastening portion 2 of the soundproof cover 1 for fixing to the unit 3 is also suppressed.

[0033] Therefore, according to the present invention, it is possible to obtain the soundproof cover 1 attached to the unit 3 that is a noise source, which can suppress the generation of rattling noise and suppress the damage of peripheral components and the decrease in attachment strength.

Explanation of Signs

[0034] 1 Soundproof cover 2 Fastening portion 3 Unit 11 Base material 12 Surface layer 21 Crushed portion 22 Fastening hole 23 Groove portion 24 First groove portion 25 Second groove portion 26 Fastening component 27 General portion 28 Bridging portion

Claims

**Claim 1** A soundproof cover having a sound-absorbing layer, wherein a crushed portion with a reduced thickness is formed in a part of the sound-absorbing layer, and a fastening hole for fixing to a noise source using a fastening component is provided at substantially the center of the crushed portion, A soundproof cover, wherein a groove portion protruding from at least one surface of the crushed portion is formed in an arc shape so as to surround the fastening hole around the fastening hole. **Claim 2** The soundproof cover according to claim 1, wherein the groove portion is formed in an annular shape so as to surround the periphery of the fastening hole. **Claim 3** The soundproof cover according to claim 1, comprising a first groove portion formed so as to protrude from one surface of the crushed portion and a second groove portion formed so as to protrude from the other surface of the crushed portion. **Claim 4** The soundproof cover according to claim 3, wherein the first groove portion and the second groove portion are continuously formed so as to surround the fastening hole. **Claim 5** The soundproof cover according to claim 4, wherein the protruding amounts and widths of the first groove portion and the second groove portion are the same. **Claim 6** The soundproof cover according to claim 1, wherein the protruding amount of the groove portion is larger than the thickness of the crushed portion and smaller than the thickness of the portion around the crushed portion in the sound-absorbing layer. **Claim 7** The soundproof cover according to claim 1, wherein surface layers made of non-woven fabric are laminated on both surfaces of the sound-absorbing layer.

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