Sound insulation member

Abstract

The present invention provides a sound insulation member capable of achieving both light weight and simplification of a manufacturing process. A sound insulation member (1) for covering an object is provided with a sound absorption body (10) formed from a foamed resin, and a cover body (20) formed from a foamed resin. A plurality of fitting recesses (15) are provided on the peripheral surface (14) of the sound-absorbing body (10), while a plurality of fitting protrusions (23) are provided on the side wall (22) of the cover body (20), and the sound-absorbing body (10) and the cover body (20) are integrated by the fitting of the plurality of fitting recesses (15) and the plurality of fitting protrusions (23).

Description

Technical Field

[0001] The present invention relates to a sound insulation member. Background Art

[0002] In Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2007-255190), a hood is disclosed, which includes: a polyurethane sound absorption part formed by covering a position opposed to a pair of cylinder heads on the lower surface of a hood main body made of synthetic resin with a polyurethane foam resin; and a PET sound absorption part formed by covering a position opposed to an intake manifold on the lower surface of the hood main body with a PET non-woven fabric. The polyurethane sound absorption part is formed by molding a polyurethane foam resin on the lower surface of the hood main body.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2007-255190 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] Since the hood main body of the above hood is formed of synthetic resin, the weight of the entire hood increases in proportion to the size of the hood. In particular, in the case of a large hood, the work load during vehicle assembly becomes large. In addition, since the polyurethane sound absorption part is formed by molding a polyurethane foam resin on the lower surface of the hood main body, manufacturing equipment for the resin raw material for manufacturing the hood main body and manufacturing equipment for the foam raw material for foaming and forming the polyurethane sound absorption part on the hood main body are required, and such manufacturing processes are very complicated.

[0008] Therefore, an object of the present invention is to provide a sound insulation member that can achieve both weight reduction and simplification of manufacturing processes.

[0009] Means for Solving the Problems

[0010] In order to achieve the above object, one aspect of the present invention is a sound insulation member that covers an object having a concave portion on its outer surface. The sound insulation member includes: a sound absorber, which is a plate-like member made of a foamed resin. The sound absorber includes: a first surface, which has a convex portion accommodated in the concave portion of the sound insulation member and covers the outer surface of the object; a second surface, which is a surface on the opposite side of the first surface; and a peripheral side surface, which connects the first surface and the second surface and is formed as an inclined surface that is inclined in such a manner that the first surface falls within the projection range of the second surface when viewed from the second surface side; and a cover, which is a concave member made of a foamed resin. The cover includes: a bottom portion, which covers the second surface of the sound absorber; and a side wall, which is erected in such a manner as to incline outward in the surface direction of the sound absorber from the outer edge of the bottom portion toward the first surface side of the sound absorber and surrounds the peripheral side surface of the sound absorber. On the peripheral side surface of the sound absorber, a plurality of fitting concave portions that open outward in the surface direction of the sound absorber and communicate in the thickness direction of the sound absorber are provided at predetermined intervals in the circumferential direction. On the inner surface of the side wall of the cover, a plurality of fitting convex portions that protrude inward in the surface direction of the sound absorber and are continuous in the thickness direction of the sound absorber are provided at positions in the circumferential direction that correspond to the plurality of fitting concave portions.

[0011] Advantages of the Invention

[0012] According to the present invention, since the sound absorber and the cover that constitute the sound insulation member are formed of a foamed resin, the overall weight can be reduced. In addition, when the sound insulation member is enlarged, the burden on the assembly work of a vehicle or the like can be reduced.

[0013] According to the above configuration, on the peripheral side surface of the sound absorber that constitutes the sound insulation member, a plurality of fitting concave portions that open outward in the surface direction of the sound absorber and communicate in the thickness direction of the sound absorber that is accommodated by the cover are provided at predetermined intervals in the circumferential direction. In addition, on the inner surface of the side wall of the cover that constitutes the sound insulation member, a plurality of fitting convex portions that protrude inward in the surface direction of the sound absorber and are continuous in the thickness direction of the sound absorber are provided in the circumferential direction. These fitting concave portions and fitting convex portions are provided at positions that are opposite to each other in the circumferential direction, so that positioning during assembly is easy. Further, by fitting these fitting concave portions and fitting convex portions to each other, integration can be achieved, so that manufacturing can be performed by a simple method. In addition, according to the specifications, the same manufacturing equipment is used and the mold and the foaming raw material are changed, whereby the sound absorber and the cover can be manufactured, so that the manufacturing process can be simplified. Description of the Drawings

[0014] Figure 1 is a perspective view of the sound insulation member.

[0015] Figure 2It is a perspective view of the sound-absorbing body.

[0016] Figure 3 It is a top view of the sound-absorbing body.

[0017] Figure 4 It is Figure 3 a 4-4 cross-sectional view of

[0018] Figure 5 It is Figure 3 a 5-5 cross-sectional view of

[0019] Figure 6 It is a perspective view of the cover body.

[0020] Figure 7 It is a top view of the cover body.

[0021] Figure 8 It is Figure 7 an 8-8 cross-sectional view of

[0022] Figure 9 It is Figure 7 a 9-9 cross-sectional view of

[0023] Figure 10 It is a top view of the sound insulation member 1.

[0024] Figure 11 It is Figure 10 an 11-11 cross-sectional view of

[0025] Figure 12 It is Figure 10 a 12-12 cross-sectional view of Detailed implementation mode

[0026] (1. Overall composition of the sound insulation member 1)

[0027] With reference to Figure 1 , the composition of an example of the sound insulation member 1 will be described. 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 power source of a vehicle such as a motor, an engine, an intake manifold, an air compressor, etc.

[0028] The sound insulation member 1 is integrally formed in a plate shape. In this embodiment, the sound insulation member 1 is substantially square in a top view. The sound insulation member 1 covers and integrates a concave cover body 20 in the plate-shaped sound-absorbing body 10. In other words, with respect to the sound insulation member 1, the plate-shaped sound-absorbing body 10 is accommodated in the concave cover body 20, and the sound insulation member 1 is integrated with the plate-shaped sound-absorbing body 10 in a state where one surface of the sound-absorbing body 10 is exposed. In addition, the sound insulation member 1 can be set to any shape according to the shape of the object and the coverage range.

[0029] In the sound insulation member 1, for example, there are provided concave engaging members (not shown), such as washers, that engage with convex engaging members (not shown), such as pins, provided in the object, and are fixed to the object by the engagement of these engaging members.

[0030] (2. Components of the sound insulation member 1)

[0031] Refer to Figures 2 - 9 , and the components of the sound insulation member 1 will be described. The sound insulation member 1 includes a sound absorber 10 and a cover 20. The sound absorber 10 is a member that covers the outer surface of the object and mainly prevents the transmission of sound and vibration generated from the object. The cover 20 is a member that houses the sound absorber 10. The cover 20 covers one side of the sound absorber 10 to make it exposed, and together with the sound absorber 10, prevents the transmission of sound and vibration generated from the object. On the other hand, the cover 20 protects the sound absorber 10 from flying objects and forms the outer appearance surface of the sound insulation member 1.

[0032] As Figure 2 shown, the sound absorber 10 is formed in a plate shape, and there are steps provided on one surface (the upper surface). In this embodiment, as Figure 3 shown, the sound absorber 10 is substantially square in a top view. In addition, the shape of the sound absorber 10 can be set to any shape such as a rectangle, polygon, circle, ellipse, etc. in a top view.

[0033] The sound absorber 10 is formed of a foamed resin. As the foamed resin, polyurethane foam, acrylic foam, silicone foam, styrene foam, foamed olefins (foamed PP, foamed PE), foamed PVC, foamed EVA, foamed PA, etc. can be used. For example, from the viewpoint of improving sound absorption, a foamed resin with an Asker C hardness of 5 to 40 degrees can be used.

[0034] The sound absorber 10 has a first surface 11 ( Figure 2 the upper surface), a second surface 13 ( Figure 2 the lower surface) located on the opposite side of the first surface 11, and a peripheral side surface 14 connecting the first surface 11 and the second surface 13. The first surface 11 is formed as a covering surface that covers the object.

[0035] The first surface 11 is formed in a shape corresponding to the outer surface of the covered object position of the object. In this embodiment, as Figure 2As shown, the first surface 11 is formed into a raised shape having two-stage convex portions 12, which are composed of a first convex portion 12a that bulges upward from the central region while retaining 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. In addition, a drive source of a vehicle as an object, such as a motor, has a complex outer surface shape and at least has a concave portion (not shown) on the outer surface. It is sufficient that the first surface 11 has at least convex portions 12 corresponding to the outer surface shape (concave shape) of the object, and the shape and range of the convex portions 12 are arbitrarily set according to the outer surface shape of the object.

[0036] As Figures 4 - 5 shown, the second surface 13 is formed into a flat shape. The second surface 13 is the 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 the cover body 20. The second surface 13 is arranged to be accommodated in the cover body 20 and to contact the bottom 21 of the cover body 20 to be described later, or to have a slight gap from the bottom 21.

[0037] As Figure 4 shown, the circumferential side surface 14 has a cross-section in the thickness direction L ( Figure 4 the up-and-down direction) of the sound absorber 10, and is formed into an inclined surface that slopes inward from the second surface 13 side toward the first surface 11 side. The circumferential side surface 14 is also formed into an inclined surface that slopes inward from the second surface 13 side toward the first surface 11 side in a cross-section (not shown) orthogonal to the cross-section shown Figure 4 . In other words, the four side surfaces of the circumferential side surface 14 are formed into inclined surfaces such that the first surface 11 falls within the projection range of the second surface 13 when viewed from the second surface 13 side.

[0038] In addition, a foaming resin material is injected into the upper and lower molds to foam-mold the sound absorber 10. For example, a flat upper mold and a concave lower mold are used. Here, since the first surface 11 of the sound absorber 10 has convex portions 12, when filling the foaming resin at the front end side of the convex portions 12, a lower mold having concave portions corresponding to the shape of the convex portions 12 provided on the bottom surface is used. Since it is easy to demold after molding, the concave inner surface of the lower mold is formed into an inclined surface. Therefore, the circumferential side surface 14 of the sound absorber 10 after demolding is formed into an inclined surface corresponding to the concave inner surface of the lower mold.

[0039] As Figures 2 - 3 shown, on the circumferential side surface 14, fitting concave portions 15 communicating with the thickness direction L of the sound absorber 10 are respectively formed at substantially the middle portions of the four side surfaces. In this embodiment, the fitting concave portions 15 are formed into a substantially semicircular shape that opens outward in the surface direction of the sound absorber 10 when viewed from above. Here, as described above, the circumferential side surface 14 is in the thickness direction L of the sound absorber 10 ( Figure 4A cross-section in the vertical direction) is formed as an inclined surface that slopes inward from the second surface 13 side of the sound-absorbing body 10 toward the first surface 11 side. In contrast, as Figure 5 shown, the inner surface of each fitting recess 15 in the cross-section in the thickness direction L of the sound-absorbing body 10 ( Figure 5 in the vertical direction) is formed as a horizontal plane along the thickness direction L of the sound-absorbing body 10. In other words, the inner surface of each fitting recess 15 in the cross-section in the thickness direction L of the sound-absorbing body 10 is formed to be parallel to the thickness direction L of the sound-absorbing body 10 without inclining from the second surface 13 side toward the first surface 11 side.

[0040] In addition, the fitting recess 15 can be formed, for example, using a lower mold that has a convex portion corresponding to the shape of the fitting recess 15 on the inner surface and is used as a lower mold for forming the above-mentioned sound-absorbing body 10.

[0041] As Figure 6 shown, the cover body 20 is formed in a concave shape. The cover body 20 has side walls 22 that are erected from the bottom 21 of the concave shape and the outer edge of the bottom 21 and constitute the side portions of the concave shape. In this embodiment, the bottom 21 and the side walls 22 of the cover body 20 are formed to have substantially the same thickness. The cover body 20 covers the sound-absorbing body 10 from the second surface 13 side, and the second surface 13 of the sound-absorbing body 10 is accommodated in a state of being covered from the bottom 21, so the bottom 21 is formed to have a shape corresponding to the second surface 13 of the sound-absorbing body 10. In addition, the shape of the bottom 21 can be set to any shape, such as a rectangular, polygonal, circular, or elliptical shape of the sound-absorbing body 10 in a top view.

[0042] The cover body 20 is formed of a foamed resin. As the foamed resin, polyurethane 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-absorbing body 10 from flying objects, a foamed resin with an Asker C hardness of 40 to 95 degrees can be used. In addition, the hardness can also be set to be the same as that of the sound-absorbing body 10 according to the use environment.

[0043] As Figure 8 shown, the side wall 22 in the Figure 8 vertical direction (the thickness direction L of the sound-absorbing body 10) of the cross-section is formed as an inclined surface that slopes outward in the surface direction of the cover body 20 from the bottom 21 side toward the front end side. In other words, it is formed as 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 when the sound-absorbing body 10 is accommodated in the cover body 20. The side wall 22 is in the same direction as Figure 8The cross-section orthogonal to the shown cross-section is also formed as an inclined surface that slopes outward in the surface direction of the sound-absorbing body 10 from the bottom 21 side toward the front end side. In other words, when the sound-absorbing body 10 is accommodated in the cover body 20, the side walls 22 are formed as inclined surfaces where the four walls slope outward in the surface direction of the sound-absorbing body 10 from the second surface 13 side of the sound-absorbing body 10 toward the first surface 11 side.

[0044] In addition, a foaming resin material is injected into the upper and lower molds to foam-mold the cover body 20. Here, since the cover body 20 is a concave member, when filling the bottom 21 of the cover body 20 with the foaming resin, for example, a concave lower mold and an upper mold disposed in the concave portion of the lower mold are used. Since it is easy to demold after forming, the concave inner surface of the lower mold and the side surface of the upper mold are each formed as an inclined surface. Therefore, the side walls 22 of the cover body 20 after demolding are formed as inclined surfaces corresponding to the concave inner surface of the lower mold and the side surface of the upper mold, respectively.

[0045] As Figures 6 - 7 shown, on the inner surface of the side wall 22, fitting protrusions 23 that protrude inward in the surface direction of the sound-absorbing body 10 and are continuous in the thickness direction L ( Figure 6 the vertical direction) of the sound-absorbing body 10 are respectively formed at approximately the middle portions of the four walls. In the present embodiment, the fitting protrusions 23 are substantially formed in a semicircular shape in a top view. As will be described later, when the sound-absorbing body 10 is accommodated in the cover body 20, the fitting protrusions 23 are fitted into the fitting recesses 15 of the sound-absorbing body 10. Therefore, the fitting protrusions 23 are formed as convex shapes corresponding to the concave inner surface shapes of the fitting recesses 15 of the sound-absorbing body 10 and are formed at positions opposite to the respective fitting recesses 15 of the sound-absorbing body 10.

[0046] Here, as described above, the cross-section of the side wall 22 in the Figure 8 vertical direction (the thickness direction L of the sound-absorbing body 10) is formed as an inclined surface that slopes outward in the surface direction of the sound-absorbing body 10 from the second surface 13 side of the sound-absorbing body 10 toward the first surface 11 side. In contrast, as Figure 9 shown, the outer side surfaces of the respective fitting protrusions 23 are formed as horizontal surfaces along the thickness direction L ( Figure 9 the vertical direction) of the sound-absorbing body 10. In addition, in other words, the outer side surfaces of the respective fitting protrusions 23 are formed as surfaces that do not slope from the second surface 13 side toward the first surface 11 side and are parallel to the thickness direction L of the sound-absorbing body 10 in the cross-section in the thickness direction L of the sound-absorbing body 10.

[0047] In addition, as the upper mold for forming the cover body 20 described above, an upper mold having a concave portion corresponding to the shape of the fitting protrusion 23 on the side surface is used, whereby the fitting protrusion 23 can be formed.

[0048] (3. Integrated Structure of the Sound Insulation Member 1)

[0049] Refer to Figures 10 - 12 , the integrated structure of the sound insulation member 1 will be described. In the sound absorption body 10, the cover body 20 is covered and integrated. In a state where the cover body 20 is covered from the second surface 13 side of the sound absorption body 10 and the first surface 11 of the sound absorption body 10 is exposed, the sound absorption body 10 is accommodated in the cover body 20. In addition, the sound absorption body 10 can be inserted from the second surface 13 side into the cover body 20 to integrate the sound absorption body 10.

[0050] As Figure 10 shown, four fitting convex portions 23 formed on the side wall 22 of the cover body 20 are fitted and integrated into four fitting concave portions 15 formed on the peripheral side surface 14 of the sound absorption body 10.

[0051] As Figure 11 shown, the cross-section of the peripheral side surface 14 of the sound absorption body 10 in the thickness direction L ( Figure 11 the up and down direction) of the sound absorption body 10 is formed as an inclined surface that inclines inward from the second surface 13 side of the sound absorption body 10 toward the first surface 11 side. On the other hand, as Figure 11 shown, the cross-section of the side wall 22 of the cover body 20 in the thickness direction L ( Figure 11 the up and down direction) of the sound absorption body 10 is formed as an inclined surface that inclines outward in the surface direction of the sound absorption body 10 from the second surface 13 side of the sound absorption body 10 toward the first surface 11 side. Therefore, in the accommodation state, the peripheral side surface 14 of the sound absorption body 10 and the side wall 22 of the cover body 20 are accommodated in a manner that is spaced apart from each other in a large manner from the second surface 13 side of the sound absorption body 10 toward the first surface 11 side.

[0052] On the other hand, as Figure 12 shown, the inner side surface of each fitting concave portion 15 formed on the peripheral side surface 14 of the sound absorption body 10 in the cross-section in the thickness direction L ( Figure 12 the up and down direction) of the sound absorption body 10 does not incline from the second surface 13 side of the sound absorption body 10 toward the first surface 11 side and is parallel to the thickness direction L of the sound absorption body 10. In addition, as Figure 12 shown, the outer side surface of each fitting convex portion 23 formed on the side wall 22 of the cover body 20 in the cross-section in the thickness direction L ( Figure 12 the up and down direction) of the sound absorption body 10 does not incline from the second surface 13 side of the sound absorption body 10 toward the first surface 11 side and is parallel to the thickness direction L of the sound absorption body 10. Therefore, in the accommodation state, the inner side surface of each fitting concave portion 15 and the outer side surface of each fitting convex portion 23 are accommodated in a state of being in contact with each other from the second surface 13 side of the sound absorption body 10 toward the first surface 11 side.

[0053] In this embodiment, in the state before accommodation, as Figure 12As shown by the dashed line, the length between the outer side surfaces of the two fitting protrusions 23 located on opposite sides in the surface direction of the sound-absorbing body 10 is set to be smaller than the length between the inner side surfaces of the two fitting recesses 15 located on opposite sides in the surface direction of the sound-absorbing body 10. Therefore, in the accommodated state, as Figure 12 shown, the sound-absorbing body 10 is accommodated in a compressed state in the surface direction of the sound-absorbing body 10 (the direction orthogonal to the thickness direction L of the sound-absorbing body 10) between the two fitting protrusions 23 located on opposite sides. With this configuration, the compression reaction force of the sound-absorbing body 10 is applied to the cover body 20, improving the holding force of the sound-absorbing body 10 on the cover body 20.

[0054] (4. Effect of the sound insulation member 1)

[0055] The sound-absorbing body 10 and the cover body 20 constituting the sound insulation member 1 are formed of foamed resin, so the whole can be lightened. Therefore, even when the sound insulation member is enlarged, the burden on the assembly work for vehicles, etc. can be reduced.

[0056] On the peripheral side surface 14 of the sound-absorbing body 10 constituting the sound insulation member 1, a plurality of fitting recesses 15 that open to the outside in the surface direction of the sound-absorbing body 10 and communicate in the thickness direction L of the sound-absorbing body 10 in which the sound-absorbing body 10 is accommodated in the cover body 20 are provided at predetermined intervals in the circumferential direction. In addition, on the inner surface of the side wall 22 of the cover body 20 constituting the sound insulation member 1, a plurality of fitting protrusions 23 that protrude inward in the surface direction of the sound-absorbing body 10 and are continuous in the thickness direction L of the sound-absorbing body 10 are provided in the circumferential direction. These fitting recesses 15 and fitting protrusions 23 are provided at positions opposite to each other in the circumferential direction, so it is easy to perform positioning during assembly. Further, by fitting these fitting recesses 15 and fitting protrusions 23 to each other, integration can be achieved, so manufacturing can be performed by a simple method. In addition, according to the specifications, by using the same manufacturing equipment and changing the mold and foaming raw materials, the sound-absorbing body 10 and the cover body 20 can be manufactured, so the manufacturing process can be simplified.

[0057] Since the sound insulation member 1 uses an object with a recess on its outer surface as the sound insulation object, the convex portion 12 that fits into the recess of the object is provided on the first surface 11 of the sound absorber 10. As described above, the plate-shaped sound absorber 10 having the convex portion 12 is formed by a mold considering the raw material filling and demolding properties during molding, and the peripheral side surface 14 of the sound absorber 10 is formed as an inclined surface that inclines inward from the second surface 13 side of the sound absorber 10 toward the first surface 11 side. On the other hand, as described above, the concave plate member, i.e., the cover 20, is formed by a mold considering the raw material filling and demolding properties during molding, and the side wall 22 of the cover 20 is formed as an inclined surface that inclines outward in the surface direction of the sound absorber 10 from the second surface 13 side of the sound absorber 10 toward the first surface 11 side. Therefore, in the accommodation state, the peripheral side surface 14 of the sound absorber 10 and the side wall 22 of the cover 20 are spaced apart from each other from the second surface 13 side of the sound absorber 10 toward the first surface 11 side, forming a structure in which the sound absorber 10 is likely to fall off from the cover 20.

[0058] Here, the sound insulation member 1 is provided with fitting recesses 15 that open outward in the surface direction of the sound absorber 10 and communicate in the thickness direction L of the sound absorber 10 on the four peripheral side surfaces 14 of the sound absorber 10. In addition, fitting protrusions 23 that protrude inward in the surface direction of the sound absorber 10 and are continuous in the thickness direction L of the sound absorber 10 are provided on the inner surface of the side wall 22 of the cover 20 at positions corresponding to the respective fitting recesses 15 of the sound absorber 10, and these fitting recesses 15 and fitting protrusions 23 are respectively fitted and integrated.

[0059] In this way, in the accommodation state, the peripheral side surface 14 of the sound absorber 10 and the side wall 22 of the cover 20 are spaced apart from each other from the second surface 13 side of the sound absorber 10 toward the first surface 11 side, and the structure in which the sound absorber 10 is likely to fall off from the cover 20 is compensated by the fitting of these fitting recesses 15 and fitting protrusions 23, and the sound absorber 10 and the cover 20 can be integrated without hindering the operation.

[0060] In particular, in the sound insulation member 1 of the present embodiment, the inner side surface of each fitting recess 15 in the sound absorber 10 is not inclined in the cross section in the thickness direction L of the sound absorber 10 from the second surface 13 side toward the first surface 11 side and is parallel to the thickness direction L of the sound absorber 10. In addition, the outer side surface of each fitting protrusion 23 in the cover 20 is not inclined in the cross section in the thickness direction L of the sound absorber 10 from the second surface 13 side toward the first surface 11 side and is parallel to the thickness direction L of the sound absorber 10. Therefore, in the accommodation state, the inner side surface of each fitting recess 15 and the outer side surface of each fitting protrusion 23 are accommodated in a state of being in contact with each other from the second surface 13 side of the sound absorber 10 toward the first surface 11 side, so that the sound absorber 10 can be more effectively prevented from falling off from the cover 20.

[0061] (5. Other Embodiments)

[0062] Within the range where there is no technical contradiction, the above-described embodiments can be modified and implemented as follows.

[0063] In the sound insulation member 1 of the above-described embodiment, the inner side surfaces of the respective fitting recesses 15 in the sound absorber 10 and the outer side surfaces of the respective fitting protrusions 23 in the cover body 20 are parallel to the thickness direction L of the sound absorber 10 in the cross-section in the thickness direction L of the sound absorber 10, but the inner side surfaces of the respective fitting recesses 15 in the sound absorber 10 and the outer side surfaces of the respective fitting protrusions 23 in the cover body 20 can be formed as inclined surfaces inclined with respect to the thickness direction L of the sound absorber 10. For example, as in the above-described embodiment, the length between the outer surfaces of the circumferential side surfaces 14 located on opposite sides in the sound absorber 10 is set larger than the length between the inner surfaces of the side walls 22 located on opposite sides in the cover body 20, and the shape of the fitting protrusion 23 is set larger with respect to the shape of the fitting recess 15. In the accommodated state, it is sufficient to set that a part of the outer side surface of the fitting protrusion 23 abuts on a part of the inner side surface of the fitting recess 15.

[0064] In the sound insulation member 1 of the above-described embodiment, a configuration is adopted in which four fitting recesses 15 and four fitting protrusions 23 are provided in the sound absorber 10 and the cover body 20, respectively. It is sufficient to provide at least two fitting recesses 15 and fitting protrusions 23, respectively. For example, when the sound absorber 10 has a rectangular shape in plan view, fitting recesses 15 are provided in two adjacent circumferential side surfaces 14 among the four circumferential side surfaces 14 of the sound absorber 10. On the other hand, fitting protrusions 23 can be provided in two adjacent side walls 22 among the four side walls 22 of the cover body 20 that are opposite to the respective fitting recesses 15. Further, when the sound absorber 10 has a rectangular shape in plan view, fitting recesses 15 are provided in two circumferential side surfaces 14 that are disposed on opposite sides among the four circumferential side surfaces 14 of the sound absorber 10. On the other hand, fitting protrusions 23 can be provided in two side walls 22 that are disposed on opposite sides and are opposite to the respective fitting recesses 15 among the four side walls 22 of the cover body 20.

[0065] In the sound insulation member 1 of the above embodiment, it is configured as follows: a fitting recess 15 (sound absorption side fitting recess) is provided on the peripheral side surface 14 of the sound absorber 10. On the other hand, a fitting protrusion 23 (cover side fitting protrusion) is provided on the side wall 22 of the cover body 20. However, it may also be configured as follows: a fitting protrusion (sound absorption side fitting protrusion) is provided on the peripheral side surface 14 of the sound absorber 10, and a fitting recess (cover side fitting recess) is provided on the side wall 22 of the cover body 20. In this case, the thickness of the side wall 22 is increased with respect to the cover body 20 of the above embodiment, so that a cover side fitting recess can be formed in the side wall 22 of the cover body 20. In addition, the sound absorption side fitting protrusion and the cover side fitting recess are formed in the same structure as the above fitting protrusion 23 and fitting recess 15, but the cover side fitting recess can be arbitrarily designed according to the thickness of the side wall 22, and the sound absorption side fitting protrusion is formed in a shape corresponding to the cover side fitting recess.

[0066] In addition, both a sound absorption side fitting recess and a sound absorption side fitting protrusion may be provided in the sound absorber, and both a cover side fitting protrusion and a cover side fitting recess may be provided in the cover body, so that the cover side fitting protrusion and the cover side fitting recess of the cover body are fitted to each other.

[0067] In the sound insulation member 1 of the above embodiment, the fitting recess 15 is configured to communicate throughout the thickness direction of the sound absorber 10, and the fitting protrusion 23 is configured to be continuous throughout the thickness direction of the sound absorber 10. However, the fitting recess 15 and the fitting protrusion 23 may be provided only in the area of the second surface 13 of the sound absorber 10. In addition, the shapes of the fitting recess 15 and the fitting protrusion 23 are not limited to being substantially semicircular in a top view, and can be any concave and convex shapes that can be fitted.

[0068] Description of reference numerals

[0069] 1: Sound insulation member;

[0070] 10: Sound absorber;

[0071] 11: First surface;

[0072] 12: Protrusion;

[0073] 13: Second surface;

[0074] 14: Peripheral side surface;

[0075] 15: Fitting recess;

[0076] 20: Cover body;

[0077] 21: Bottom;

[0078] 22: Side wall;

[0079] 23: Fitting protrusion.

Claims

1. A sound insulation member that covers an object having a recess on its outer surface, wherein, the sound insulation member includes: a sound absorber, which is a plate-shaped member made of foamed resin. The sound absorber includes: a first surface having a convex portion received in the recess of the sound insulation member to cover the outer surface of the object; a second surface, which is a surface on the opposite side of the first surface; and a peripheral side surface that connects the first surface and the second surface and is formed as an inclined surface that is inclined in such a manner that the first surface falls within the projection range of the second surface when viewed from the second surface side; and a cover body, which is a concave member made of foamed resin. The cover body includes: a bottom that covers the second surface of the sound absorber; and a side wall that is erected in a manner that inclines outward in the surface direction of the sound absorber from the outer edge of the bottom toward the first surface side of the sound absorber and surrounds the peripheral side surface of the sound absorber, on the peripheral side surface of the sound absorber, a plurality of fitting recesses that open outward in the surface direction of the sound absorber and communicate in the thickness direction of the sound absorber are provided at predetermined intervals in the circumferential direction, on the inner surface of the side wall of the cover body, a plurality of fitting protrusions that protrude inward in the surface direction of the sound absorber and are continuous in the thickness direction of the sound absorber are provided at positions in the circumferential direction that correspond to the plurality of fitting recesses.

2. The sound insulation member according to claim 1, wherein, the inner side surface of the fitting recess is formed parallel to the thickness direction of the sound absorber, and the outer side surface of the fitting protrusion is formed parallel to the thickness direction of the sound absorber.

3. The sound insulation member according to claim 1 or 2, wherein, the sound absorber is a plate-shaped member having a rectangular shape, the fitting recesses are respectively provided on two of the peripheral side surfaces that are adjacent in the circumferential direction of the sound absorber.

4. The sound insulation member according to claim 1 or 2, wherein, the sound absorber is a plate-shaped member having a rectangular shape, the fitting recesses are respectively provided on two of the peripheral side surfaces that are arranged on opposite sides in the surface direction of the sound absorber.

5. The sound insulation member according to claim 4, wherein, the sound absorber is set such that the length between the outer side surfaces of two fitting protrusions arranged on opposite sides in the surface direction of the sound absorber is smaller than the length between the inner side surfaces of two fitting recesses arranged on opposite sides in the surface direction of the sound absorber.

6. A sound insulation member that covers an object having a recess on its outer surface, wherein, the sound insulation member includes: a sound absorber, which is a plate-shaped member made of foamed resin. The sound absorber includes: a first surface having a convex portion received in the recess of the sound insulation member to cover the outer surface of the object; a second surface, which is a surface on the opposite side of the first surface; and a peripheral side surface that connects the first surface and the second surface and is formed as an inclined surface that is inclined in such a manner that the first surface falls within the projection range of the second surface when viewed from the second surface side; and A cover body, which is a concave member made of foamed resin, the cover body comprising: a bottom portion that covers the second surface of the sound absorber; and side walls that are erected in a manner inclined outward in the surface direction of the sound absorber from the outer edge of the bottom portion toward the first surface side of the sound absorber, surrounding the peripheral side surface of the sound absorber. On the peripheral side surface of the sound absorber, a plurality of sound absorption side fitting convex portions protruding outward in the surface direction of the sound absorber or sound absorption side fitting concave portions opening inward in the surface direction of the sound absorber are provided at predetermined intervals in the circumferential direction. On the inner surface of the side walls of the cover body, a plurality of cover side fitting concave portions opening inward in the surface direction of the cover body and fitting with the sound absorption side fitting convex portions or cover side fitting convex portions protruding outward in the surface direction of the cover body and fitting with the sound absorption side fitting concave portions are provided in the circumferential direction.

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