Soundproofing materials

Abstract

To provide a soundproof member that can realize both weight reduction and simplification of a manufacturing process.SOLUTION: A soundproof member 1 covering an object comprises a sound absorbing body 10 formed of foam resin, and a cover body 20 of foam resin. While a peripheral side surface of the sound absorbing body 10 is provided with a plurality of fitting concave parts, a side wall of the cover body 20 is provided with a plurality of fitting convex parts. The sound absorbing body 10 and the cover body 20 are integrated by fitting the plurality of fitting concave parts and the plurality of fitting convex parts together.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a soundproofing member.

Background Art

[0002] In Patent Document 1, a urethane sound-absorbing portion formed by covering the opposing positions of a pair of cylinder heads on the lower surface of a cover body made of a synthetic resin with urethane foam resin, and a PET sound-absorbing portion formed by covering the opposing position of an intake manifold on the lower surface of the cover body with a PET non-woven fabric are provided. The urethane sound-absorbing portion is configured by molding urethane foam resin on the lower surface of the cover body.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Since the cover body of the above engine cover is formed of a synthetic resin, the weight of the entire cover increases in proportion to the size of the engine cover. In particular, in the case of a large engine cover, the work load during vehicle assembly increases. Further, since the urethane sound-absorbing portion is formed by molding urethane foam resin on the lower surface of the cover body, manufacturing equipment for the resin raw material for manufacturing the cover body and manufacturing equipment for the foaming raw material for foaming and forming the urethane sound-absorbing portion on the cover body are required, and the manufacturing process becomes complicated.

[0005] An object of the present invention is to provide a soundproofing member capable of achieving both weight reduction and simplification of the manufacturing process.

Means for Solving the Problems

[0006] To solve the above problems, one aspect of the present invention is a sound-insulating member for covering an object having a recess on its outer surface, comprising: a plate-shaped member made of foamed resin, having a protrusion that is accommodated in the recess of the sound-insulating member, a sound-absorbing body comprising: a first surface that covers the outer surface of the object, a second surface that is opposite to the first surface, and a peripheral surface that connects the first surface and the second surface and is an inclined surface that, when viewed from the second surface side, causes the first surface to fall within the projection range of the second surface; and a concave member made of foamed resin, having a bottom that covers the second surface of the sound-absorbing body, and the outer part of the bottom A cover body comprising: a side wall erected from the edge toward the first surface side of the sound absorber so as to be inclined outward in the surface direction of the sound absorber, and surrounding the circumferential surface of the sound absorber, wherein the circumferential surface of the sound absorber has a plurality of fitting recesses provided at predetermined intervals in the circumferential direction, which open outward in the surface direction of the sound absorber and communicate in the thickness direction of the sound absorber, and the inner surface of the side wall of the cover body has a plurality of fitting protrusions provided at positions opposite to the plurality of fitting recesses in the circumferential direction, which protrude inward in the surface direction of the sound absorber and are connected in the thickness direction of the sound absorber 、 The sound-absorbing body and the cover body are integrated by the engagement of their respective opposing fitting recesses and fitting protrusions in the circumferential direction of the sound-absorbing body. It is a soundproofing material.

[0007] According to the above configuration, the sound-absorbing material and cover body constituting the soundproofing component are made of foamed resin, thus enabling overall weight reduction. Furthermore, even when the soundproofing component is large, the burden of assembly work on vehicles and other objects can be reduced.

[0008] According to the above configuration, the circumferential surface of the sound-absorbing body constituting the sound-insulating member is provided with multiple interlocking recesses at predetermined intervals in the circumferential direction, which open outward in the planar direction of the sound-absorbing body and communicate with the thickness direction of the sound-absorbing body where the sound-absorbing body is housed in the cover body. Furthermore, the inner surface of the side wall of the cover body constituting the sound-insulating member is provided with multiple interlocking protrusions in the circumferential direction, which project inward in the planar direction of the sound-absorbing body and are connected in the thickness direction of the sound-absorbing body. Since these interlocking recesses and protrusions are located opposite each other in the circumferential direction, positioning during assembly is facilitated. Moreover, since these interlocking recesses and protrusions can be integrated by interlocking them, manufacturing can be done in a simple manner. In addition, depending on the specifications, the sound-absorbing body and the cover body can be manufactured using the same manufacturing equipment, but by changing the mold and foaming raw materials, thus simplifying the manufacturing process. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view of a soundproofing material. [Figure 2] This is a perspective view of the sound-absorbing material. [Figure 3] This is a plan view of the sound-absorbing material. [Figure 4] This is a cross-sectional view of section 4-4 in Figure 3. [Figure 5] This is a cross-sectional view of section 5-5 in Figure 3. [Figure 6] This is a perspective view of the cover body. [Figure 7] This is a plan view of the cover body. [Figure 8] This is a cross-sectional view of section 8-8 in Figure 7. [Figure 9] This is a cross-sectional view of section 9-9 in Figure 5. [Figure 10] This is a plan view of soundproofing member 1. [Figure 11] This is a cross-sectional view of line 11-11 in Figure 10. [Figure 12] This is a cross-sectional view of line 12-12 in Figure 10. [Modes for carrying out the invention]

[0010] (1. Overall Structure of the Sound Insulation Member 1) The structure of an example of the sound insulation member 1 will be described with reference to FIG. 1. The sound insulation member 1 covers an object (not shown) and prevents the transmission of sound and vibration generated from the object. The object is, for example, a motor, an engine which is a power source of a vehicle, an intake manifold, an air compressor, etc.

[0011] The sound insulation member 1 is formed in a plate shape as a whole. In this embodiment, the sound insulation member 1 is substantially square in a plan view. The sound insulation member 1 is integrally formed by covering a plate-shaped sound absorber 10 with a concave cover body 20. In other words, the sound insulation member 1 is integrally formed in a state where the plate-shaped sound absorber 10 is housed in the concave cover body 20 and one surface of the sound absorber 10 is exposed. Note that the sound insulation member 1 can have an arbitrary shape according to the shape of the object and the covered range.

[0012] The sound insulation member 1 is provided with concave engaging members (not shown) such as grommets that are engaged with convex engaging members (not shown) such as pins provided on the object, and is fixed to the object by the engagement of these engaging members.

[0013] (2. Constituent Members of the Sound Insulation Member 1) The constituent members of the sound insulation member 1 will be described with reference to FIGS. 2 - 9. The sound insulation member 1 includes a sound absorber 10 and a cover body 20. The sound absorber 10 is a member that is covered on the outer surface of the object and mainly prevents the transmission of sound and vibration generated from the object. The cover body 20 is a member that houses the sound absorber 10. The cover body 20 covers the sound absorber 10 in a state where one surface of the sound absorber 10 is exposed, prevents the transmission of sound and vibration generated from the object together with the sound absorber 10, protects the sound absorber 10 from flying objects, and forms the design surface of the sound insulation member 1.

[0014] As shown in FIG. 2, the sound absorber 10 is formed in a plate shape and has a step provided on one surface (upper surface). In this embodiment, as shown in FIG. 3, the sound absorber 10 is substantially square in a plan view. Note that the shape of the sound absorber 10 can be an arbitrary shape such as a rectangle, a polygon, a circle, an ellipse, etc. in a plan view.

[0015] The sound absorber 10 is formed of a foamed resin. As the foamed resin, urethane foam, acrylic foam, silicone foam, styrene foam, foamed olefin (foamed PP, foamed PE), foamed PVC, foamed EVA, foamed PA, etc. can be used. For example, from the viewpoint of enhancing sound absorption, it is preferable to use a foamed resin having an Asker C hardness of 5 to 40 degrees.

[0016] The sound absorber 10 has a first surface 11 (the upper surface in FIG. 2), a second surface 13 (the lower surface in FIG. 2) located on the side opposite to the first surface 11, and a peripheral side surface 14 connecting the first surface 11 and the second surface 13. The first surface 11 serves as a covering surface that covers the object.

[0017] The first surface 11 has a shape corresponding to the outer surface of the object portion to be covered. In the present embodiment, as shown in FIG. 2, the first surface 11 has a raised shape having a two-stage convex portion 12 formed by a first convex portion 12a that bulges upward from the central region leaving a substantially fan-shaped flat portion, and a second convex portion 12b that further bulges upward from the first convex portion 12a on one side surface side of the sound absorber 10. Note that a motor or the like, which is a drive source of a vehicle as the object, has a complex outer surface shape and at least a concave portion (not shown) on the outer surface. The first surface 11 only needs to have at least a convex portion 12 corresponding to the outer surface shape (concave shape) of the object, and the shape and range of the convex portion 12 are arbitrarily set according to the outer surface shape of the object.

[0018] As shown in FIGS. 4 to 5, the second surface 13 has a planar shape. The second surface 13 is a surface on the side opposite to the covering surface of the object, and the sound absorber 10 is covered from the second surface 13 side of the sound absorber 10 by a cover body 20. The second surface 13 is housed in the cover body 20 and is in contact with the bottom portion 21 of the cover body 20 to be described later, or is arranged with a slight gap from the bottom portion 21.

[0019] As shown in Figure 4, the circumferential surface 14 is an inclined surface that slopes inward from the second surface 13 towards the first surface 11 in a cross-section in the thickness direction L (vertical direction in Figure 4) of the sound absorber 10. Similarly, the circumferential surface 14 is an inclined surface that slopes inward from the second surface 13 towards the first surface 11 in a cross-section perpendicular to the cross-section shown in Figure 4 (not shown). In other words, the four sides of the circumferential surface 14 are inclined surfaces such that, when viewed from the second surface 13 side, the first surface 11 falls within the projection range of the second surface 13.

[0020] The sound-absorbing body 10 is foam-molded by injecting foamed resin material into upper and lower molds. For example, a flat upper mold and a concave lower mold are used. Here, since the first surface 11 of the sound-absorbing body 10 has a convex portion 12, when filling the tip side of the convex portion 12 with foamed resin, a lower mold is used that has a recess on its bottom surface corresponding to the shape of the convex portion 12. To facilitate demolding after molding, the inner surface of the concave lower mold is inclined. Therefore, the circumferential surface 14 of the sound-absorbing body 10 after demolding is an inclined surface corresponding to the inner surface of the concave lower mold.

[0021] As shown in Figures 2 and 3, fitting recesses 15 communicating with the thickness direction L of the sound absorber 10 are formed on the circumferential surface 14, approximately midway between the four surfaces. In this embodiment, the fitting recesses 15 are approximately semicircular in plan view and open outward in the surface direction of the sound absorber 10. Here, as described above, the circumferential surface 14 is an inclined surface that slopes inward from the second surface 13 to the first surface 11 of the sound absorber 10 in a cross-section in the thickness direction L of the sound absorber 10 (vertical direction in Figure 4), whereas the inner surface of each fitting recess 15 is a horizontal plane along the thickness direction L of the sound absorber 10 in a cross-section in the thickness direction L of the sound absorber 10 (vertical direction in Figure 5), as shown in Figure 5. In other words, the inner surface of each fitting recess 15 is parallel to the thickness direction L of the sound absorber 10 in a cross-section in the thickness direction L of the sound absorber 10, without sloping from the second surface 13 to the first surface 11.

[0022] The fitting recess 15 can be formed, for example, by using a lower mold for molding the sound-absorbing body 10 described above, which has a protrusion on its inner surface corresponding to the shape of the fitting recess 15.

[0023] As shown in Figure 6, the cover body 20 is formed in a concave shape. The cover body 20 has a concave bottom portion 21 and side walls 22 that are erected from the outer edge of the bottom portion 21 and form a concave side portion. In this embodiment, the bottom portion 21 and the side walls 22 of the cover body 20 are formed with substantially the same thickness. The cover body 20 is placed over the sound absorber 10 from the second surface 13 side, and the second surface 13 of the sound absorber 10 is covered from the bottom portion 21, so the bottom portion 21 is shaped to correspond to the second surface 13 of the sound absorber 10. The shape of the bottom portion 21 can be any shape that corresponds to the shape of the sound absorber 10, such as a rectangle, polygon, circle, or ellipse when viewed from above.

[0024] The cover body 20 is formed from a foamed resin. As the foamed resin, urethane foam, acrylic foam, silicone foam, styrene foam, foamed olefin (foamed PP, foamed PE), foamed PVC, foamed EVA, foamed PA, etc., can be used. For example, from the viewpoint of protecting the sound absorber 10 from flying debris, it is preferable to use a foamed resin with an Asker C hardness of 40 to 95 degrees. However, depending on the usage environment, the hardness can be the same as that of the sound absorber 10.

[0025] As shown in Figure 8, the side wall 22 is an inclined surface that slopes outward in the planar direction of the cover body 20 from the bottom 21 side towards the front end in the cross-section in the vertical direction (thickness direction L of the sound absorber 10) of Figure 8. In other words, when the sound absorber 10 is housed in the cover body 20, the side wall 22 is an inclined surface that slopes outward in the planar direction of the sound absorber 10 from the second surface 13 side towards the first surface 11 side. Similarly, in a cross-section perpendicular to the cross-section shown in Figure 8, the side wall 22 is an inclined surface that slopes outward in the planar direction of the sound absorber 10 from the bottom 21 side towards the front end. In other words, when the sound absorber 10 is housed in the cover body 20, the four walls of the side wall 22 are inclined surfaces that slope outward in the planar direction of the sound absorber 10 from the second surface 13 side towards the first surface 11 side.

[0026] The cover body 20 is formed by foam molding by injecting foamed resin material into upper and lower molds. Since the cover body 20 is a concave member, when filling the bottom 21 of the cover body 20 with foamed resin, for example, a concave lower mold and an upper mold positioned within the concave part of the lower mold are used. To facilitate demolding after molding, the inner surface of the concave part of the lower mold and the side surface of the upper mold are inclined surfaces. Therefore, the side walls 22 of the cover body 20 after demolding are inclined surfaces corresponding to the inner surface of the concave part of the lower mold and the side surface of the upper mold, respectively.

[0027] As shown in Figures 6 and 7, on the inner surface of the side wall 22, fitting protrusions 23 are formed approximately midway between the four walls, protruding inward in the planar direction of the sound absorber 10 and extending in the thickness direction L (vertical direction in Figure 6) of the sound absorber 10. In this embodiment, the fitting protrusions 23 are approximately semicircular in plan view. As will be described later, the fitting protrusions 23 engage with the fitting recesses 15 of the sound absorber 10 when the sound absorber 10 is housed in the cover body 20. Therefore, the fitting protrusions 23 are convex in shape corresponding to the shape of the inner surface of the recess 15 of the sound absorber 10, and are formed at positions opposite each fitting recess 15 of the sound absorber 10.

[0028] As mentioned above, the side wall 22 is an inclined surface that slopes outward in the surface direction of the sound absorber 10 from the second surface 13 side toward the first surface 11 side in the cross-section in the vertical direction (thickness direction L of the sound absorber 10) of Figure 8, whereas the outer surface of each fitting projection 23 is a horizontal plane along the thickness direction L of the sound absorber 10 (vertical direction in Figure 9), as shown in Figure 9. In other words, the outer surface of each fitting projection 23 is parallel to the thickness direction L of the sound absorber 10, without sloping from the second surface 13 side toward the first surface 11 side in the cross-section in the thickness direction L of the sound absorber 10.

[0029] The mating projection 23 can be formed by using an upper mold, which is used for molding the cover body 20 as described above, and which has a recess on its side corresponding to the shape of the mating projection 23.

[0030] (3. Integrated configuration of soundproofing component 1) The integrated configuration of the soundproofing member 1 will be explained with reference to Figures 10-12. The soundproofing member 1 is formed by placing a cover body 20 over a sound-absorbing body 10 to create an integrated structure. The cover body 20 is placed over the sound-absorbing body 10 from the second surface 13 side, and the sound-absorbing body 10 is housed inside the cover body 20 with the first surface 11 of the sound-absorbing body 10 exposed. Alternatively, the sound-absorbing body 10 may be inserted into the cover body 20 from the second surface 13 side to create the integrated structure.

[0031] As shown in Figure 10, four fitting recesses 15 formed on the peripheral surface 14 of the sound absorber 10, and four formed on the side wall 22 of the cover body 20 of The interlocking projection 23 is fitted in and integrated.

[0032] As shown in Figure 11, the peripheral surface 14 of the sound absorber 10 is an inclined surface that slopes inward from the second surface 13 to the first surface 11 in a cross-section in the thickness direction L (vertical direction in Figure 11) of the sound absorber 10. On the other hand, as shown in Figure 11, the side wall 22 of the cover body 20 is an inclined surface that slopes outward in the surface direction of the sound absorber 10 from the second surface 13 to the first surface 11 in a cross-section in the thickness direction L (vertical direction in Figure 11) of the sound absorber 10. Therefore, in the housing state, the peripheral surface 14 of the sound absorber 10 and the side wall 22 of the cover body 20 are housed such that the distance between them increases from the second surface 13 to the first surface 11 of the sound absorber 10.

[0033] On the other hand, as shown in Figure 12, the inner surfaces of each fitting recess 15 formed on the circumferential surface 14 of the sound absorber 10 are parallel to the thickness direction L of the sound absorber 10 (vertical direction in Figure 12) in a cross-section along the thickness direction L of the sound absorber 10, without being inclined from the second surface 13 to the first surface 11 of the sound absorber 10. Similarly, as shown in Figure 12, the outer surfaces of each fitting projection 23 formed on the side wall 22 of the cover body 20 are parallel to the thickness direction L of the sound absorber 10 (vertical direction in Figure 12) in a cross-section along the thickness direction L of the sound absorber 10, without being inclined from the second surface 13 to the first surface 11 of the sound absorber 10. Therefore, in the housing state, the inner surfaces of each fitting recess 15 and the outer surfaces of each fitting projection 23 are in contact with each other from the second surface 13 to the first surface 11 of the sound absorber 10.

[0034] In this embodiment, before being housed, as shown by the dashed line in Figure 12, the distance between the outer surfaces of the two opposite fitting protrusions 23 in the planar direction of the sound absorber 10 is set to be smaller than the distance between the inner surfaces of the two opposite fitting recesses 15 in the planar direction of the sound absorber 10. Therefore, in the housed state, as shown in Figure 12, the sound absorber 10 is housed between the two opposite fitting protrusions 23 in a compressed state in the planar direction of the sound absorber 10 (in a direction perpendicular to the thickness direction L of the sound absorber 10). With this configuration, a compressive reaction force of the sound absorber 10 is applied to the cover body 20, and the holding force of the sound absorber 10 to the cover body 20 is increased.

[0035] (4. Effects of soundproofing material 1) Since the sound-absorbing body 10 and the cover body 20 that make up the sound-insulating member 1 are made of foamed resin, the overall weight can be reduced. Therefore, even if the sound-insulating member is large, the burden of assembly work on vehicles and the like can be reduced.

[0036] The circumferential surface 14 of the sound-absorbing body 10 constituting the sound-insulating member 1 has multiple fitting recesses 15 that open outward in the planar direction of the sound-absorbing body 10 and communicate with the thickness direction L of the sound-absorbing body 10, which is housed in the cover body 20, and are provided at predetermined intervals in the circumferential direction. Furthermore, the inner surface of the side wall 22 of the cover body 20 constituting the sound-insulating member 1 has multiple fitting protrusions 23 that project inward in the planar direction of the sound-absorbing body 10 and are connected to the thickness direction L of the sound-absorbing body 10, in the circumferential direction. Since these fitting recesses 15 and fitting protrusions 23 are provided at positions opposite to each other in the circumferential direction, positioning during assembly is made easy. Moreover, since these fitting recesses 15 and fitting protrusions 23 can be integrated by fitting them together, they can be manufactured using a simple method. In addition, depending on the specifications, the sound-absorbing body 10 and the cover body 20 can be manufactured using the same manufacturing equipment, by changing the mold and foaming raw materials, thus simplifying the manufacturing process.

[0037] The soundproofing member 1 is designed to soundproof objects that have recesses on their outer surface. Therefore, the first surface 11 of the sound-absorbing body 10 has a protrusion 12 that is accommodated in the recess of the object. As described above, the plate-shaped sound-absorbing body 10 having the protrusion 12 has a mold configuration that takes into account raw material filling and demolding during molding. The circumferential surface 14 of the sound-absorbing body 10 is an inclined surface that slopes inward from the second surface 13 side toward the first surface 11 side of the sound-absorbing body 10. On the other hand, the cover body 20, which is a concave plate member, has a mold configuration that takes into account raw material filling and demolding during molding. Therefore, the side wall 22 of the cover body 20 is an inclined surface that slopes outward in the surface direction of the sound-absorbing body 10, from the second surface 13 side toward the first surface 11 side of the sound-absorbing body 10. Therefore, in the containment state, the circumferential surface 14 of the sound-absorbing body 10 and the side wall 22 of the cover body 20 have a larger gap between them as you move from the second surface 13 side of the sound-absorbing body 10 towards the first surface 11 side, making it easy for the sound-absorbing body 10 to fall out of the cover body 20.

[0038] Here, the soundproofing member 1 has fitting recesses 15 on each of the four circumferential surfaces 14 of the sound-absorbing body 10, which open outward in the planar direction of the sound-absorbing body 10 and communicate with the thickness direction L of the sound-absorbing body 10. Furthermore, on the inner surface of the side wall 22 of the cover body 20, fitting protrusions 23 are provided at positions opposite each of the fitting recesses 15 of the sound-absorbing body 10, projecting inward in the planar direction of the sound-absorbing body 10 and connecting with the thickness direction L of the sound-absorbing body 10. These fitting recesses 15 and fitting protrusions 23 are fitted together and integrated.

[0039] Thus, in the housing state, the peripheral surface 14 of the sound absorber 10 and the side wall 22 of the cover body 20 have a larger gap between them as you move from the second surface 13 side to the first surface 11 side of the sound absorber 10. This structure makes the sound absorber 10 prone to falling off the cover body 20. This is compensated for by the engagement of the fitting recess 15 and fitting protrusion 23, respectively, allowing the sound absorber 10 and the cover body 20 to be integrated to a degree that does not hinder handling.

[0040] In particular, in the soundproofing member 1 of this embodiment, the inner surface of each fitting recess 15 in the sound absorber 10 is parallel to the thickness direction L of the sound absorber 10 in a cross-section in the thickness direction L of the sound absorber 10, without being inclined from the second surface 13 side to the first surface 11 side of the sound absorber 10. Similarly, the outer surface of each fitting projection 23 in the cover body 20 is parallel to the thickness direction L of the sound absorber 10 in a cross-section in the thickness direction L of the sound absorber 10, without being inclined from the second surface 13 side to the first surface 11 side of the sound absorber 10. Therefore, in the housing state, the inner surface of each fitting recess 15 and the outer surface of each fitting projection 23 are in contact with each other from the second surface 13 side to the first surface 11 side of the sound absorber 10, thus more effectively preventing the sound absorber 10 from falling out of the cover body 20.

[0041] (5. Other Examples) The above embodiment can be implemented with the following modifications, to the extent that they do not contradict the technical standards.

[0042] In the soundproofing member 1 of the above embodiment, the inner surfaces of each fitting recess 15 in the sound-absorbing body 10 and the outer surfaces of each fitting protrusion 23 in the cover body 20 are parallel to the thickness direction L of the sound-absorbing body 10 in a cross-section in the thickness direction L of the sound-absorbing body 10. However, the inner surfaces of each fitting recess 15 in the sound-absorbing body 10 and the outer surfaces of each fitting protrusion 23 in the cover body 20 may be inclined surfaces that are inclined with respect to the thickness direction L of the sound-absorbing body 10 in a cross-section in the thickness direction L of the sound-absorbing body 10. For example, as in the above embodiment, the length between the outer surfaces of the circumferential surfaces 14 located on opposite sides of the sound-absorbing body 10 may be set to be greater than the length between the inner surfaces of the side walls 22 located on opposite sides of the cover body 20, or the shape of the fitting protrusion 23 may be set to be greater than the shape of the fitting recess 15, so that in the housing state, a part of the outer surface of the fitting protrusion 23 abuts against a part of the inner surface of the fitting recess 15.

[0043] In the soundproofing member 1 of the above embodiment, the sound-absorbing body 10 and the cover body 20 are each provided with four fitting recesses 15 and four fitting protrusions 23. At least two fitting recesses 15 and two fitting protrusions 23 are required. For example, if the sound-absorbing body 10 has a rectangular shape in plan view, fitting recesses 15 can be provided on two adjacent circumferential surfaces 14 of the four circumferential surfaces 14 of the sound-absorbing body 10, while fitting protrusions 23 can be provided on two adjacent side walls 22 of the cover body 20 that are opposite each fitting recess 15. Furthermore, if the sound absorber 10 has a rectangular shape in plan view, fitting recesses 15 can be provided on two of the four circumferential surfaces 14 of the sound absorber 10 that are located on opposite sides, while fitting protrusions 23 can be provided on two of the four side walls 22 of the cover body 20 that are located opposite each other to the fitting recesses 15.

[0044] In the soundproofing member 1 of the above embodiment, a fitting recess 15 is provided on the circumferential surface 14 of the sound-absorbing body 10, while a fitting projection 23 is provided on the side wall 22 of the cover body 20. However, it is also possible to provide a fitting projection (second fitting projection) on the circumferential surface 14 of the sound-absorbing body 10, while providing a fitting recess (second fitting recess) on the side wall 22 of the cover body 20. In this case, with respect to the cover body 20 of the above embodiment, side wall By increasing the thickness of 22, a second fitting recess can be formed on the side wall 22 of the cover body 20. The second fitting projection and the second fitting recess have the same structure as the fitting projection 23 and fitting recess 15 described above, however, the second fitting recess is... side wall Depending on the thickness of 22, it can be designed arbitrarily, and the second mating projection should have a shape corresponding to the second mating recess.

[0045] In the soundproofing member 1 of the above embodiment, the mating recess 15 is configured to communicate with the entire thickness direction of the sound-absorbing body 10, and the mating protrusion 23 is configured to connect with the entire thickness direction of the sound-absorbing body 10. However, the mating recess 15 and the mating protrusion 23 may be provided only in the area of ​​the second surface 13 of the sound-absorbing body 10. Furthermore, the shape of the mating recess 15 and the mating protrusion 23 is not limited to a substantially semicircular shape in plan view, but can be any shape as long as it is a mating concave shape and a convex shape. [Explanation of symbols]

[0046] 1: Soundproofing material, 10: Sound absorber, 11: First surface, 12: Protrusion, 13: Second surface, 14: Peripheral side, 15: Fitting recess, 20: Cover body, 21: Bottom, 22: Side wall, 23: Fitting protrusion

Claims

1. A soundproofing member that covers an object having a recess on its outer surface, A sound-absorbing body comprising: a plate-shaped member made of foamed resin, having a protrusion that is accommodated in the recess of the object, a first surface that covers the outer surface of the object, a second surface that is opposite to the first surface, and a peripheral surface that connects the first surface and the second surface and is an inclined surface that, when viewed from the second surface side, causes the first surface to fall within the projection range of the second surface; A cover body comprising a concave member made of foamed resin, having a bottom portion that covers the second surface of the sound absorber, and a side wall that is erected from the outer edge of the bottom portion so as to be inclined outward in the surface direction of the sound absorber toward the first surface side of the sound absorber, and that surrounds the circumferential surface of the sound absorber, Equipped with, Multiple fitting recesses are provided on the circumferential surface of the sound-absorbing body at predetermined intervals in the circumferential direction, opening outward in the surface direction of the sound-absorbing body and communicating in the thickness direction of the sound-absorbing body. Multiple fitting protrusions are provided on the inner surface of the side wall of the cover body, projecting inward in the planar direction of the sound absorber and extending in the thickness direction of the sound absorber, at positions opposite to the multiple fitting recesses in the circumferential direction. A sound-insulating member in which the sound-absorbing body and the cover body are integrated by the engagement of their respective opposing fitting recesses and fitting protrusions in the circumferential direction of the sound-absorbing body.

2. The soundproofing member according to claim 1, wherein the inner surface of the fitting recess is parallel to the thickness direction of the sound-absorbing material, and the outer surface of the fitting protrusion is parallel to the thickness direction of the sound-absorbing material.

3. The sound-absorbing material is a rectangular plate-shaped member, The soundproofing member according to claim 1 or 2, wherein the fitting recesses are provided on two adjacent circumferential surfaces of the sound absorber in the circumferential direction.

4. The sound-absorbing material is a rectangular plate-shaped member, The soundproofing member according to claim 1 or 2, wherein the fitting recesses are provided on two circumferential surfaces of the sound absorber that are arranged on opposite sides in the surface direction.

5. The sound-absorbing member according to claim 4, wherein the length between the outer surfaces of two fitting protrusions arranged on opposite sides in the planar direction of the sound-absorbing member is set to be smaller than the length between the inner surfaces of two fitting recesses arranged on opposite sides in the planar direction of the sound-absorbing member.

6. The soundproofing member according to claim 2, wherein, with the sound-absorbing body housed in the cover body, the distance between the peripheral surface of the sound-absorbing body and the side wall of the cover body increases from the second surface side to the first surface side of the sound-absorbing body, excluding each of the fitting recesses and fitting protrusions that fit together.

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