Soundproof cover

Abstract

To provide a soundproof cover that is lightweight and can improve degrees of freedom in shape design.SOLUTION: Soundproof cover 1a, which encloses an object, has a first split body 2a formed of foam resin and a second split body 4a formed of foam resin. The first split body 2a has a hinge shaft 27 formed of foam resin, while the second split body 4a has bearing portions (a first bearing portion 46, a second bearing portion 48) formed of foam resin. The bearing portions engage the hinge shaft 27 to pivotally support the first split body 2a and the second split body 4a.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a soundproof cover. [Background technology]

[0002] A soundproof cover is attached to the driving source of a vehicle to prevent the transmission of sound and vibration. In recent years, a structure in which the entire driving source is covered with a soundproof cover has been adopted from the viewpoint of improving the quietness inside the vehicle cabin. For example, Literature 1 discloses a compressor cover having first and second surrounding walls made of resin, and a hinge part made of resin that connects one side part of the first and second surrounding walls and is formed integrally with the first and second surrounding walls. Literature 2 discloses a sound absorbing cover that is integrally provided with a plurality of sound absorbing parts and a hinge part that connects a pair of adjacent sound absorbing parts. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-133408 A [Patent Document 2] Patent No. 4922978 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the covers of Documents 1 and 2, the thickness of the hinge portion is set smaller than the thickness of the cover body, and therefore, when the cover body is formed from foamed resin and applied to a large driving source, etc., there is a risk that the hinge portion will be damaged during installation, etc.

[0005] An object of the present invention is to provide a soundproof cover that can achieve both weight reduction and improved handling strength. [Means for solving the problem]

[0006] The soundproof cover is a soundproof cover that surrounds an object. The soundproof cover includes a first divided body formed of a foamed resin and a second divided body formed of a foamed resin. The first divided body includes a hinge shaft formed of a foamed resin, and the second divided body includes a bearing portion formed of a foamed resin that fits onto the hinge shaft of the first divided body and rotatably supports the second divided body and the first divided body.

[0007] The first division constituting the soundproof cover, including the hinge shaft, is made of foamed resin. The second division constituting the soundproof cover, including the bearing portion, has its constituent members made of foamed resin. Therefore, since all of the constituent members are made of foamed resin, the soundproof cover can be made lighter.

[0008] In addition, since the first and second divisions are connected by fitting the hinge axis of the first division into the bearing portion of the second division, the strength of the connecting portion can be increased and handling strength can be improved compared to when the first and second divisions are connected with a thin hinge portion. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a perspective view of a first example of a soundproof cover. [Diagram 2] FIG. 2 is a perspective view of a first split body according to a first example. [Diagram 3] FIG. 2 is a perspective view of a second divided body of the first example. [Figure 4] FIG. 2 is a perspective view of the first example of the soundproof cover in an assembled state. [Diagram 5] FIG. 2 is a plan view of the first example of the soundproof cover in an assembled state. [Figure 6] This is a cross section taken along line VI-VI in FIG. [Figure 7] This is a cross section taken along line VII-VII in Figure 5. [Figure 8] FIG. 2 is a plan view of the first example of the soundproof cover in a fixed state. [Figure 9] This is a cross section taken along line IX-IX in Figure 8. [Figure 10] This is a cross section taken along line X-X in Figure 8. [Figure 11] FIG. 11 is a perspective view of a second example of a soundproof cover in an assembled state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (1. Basic structure of the first example soundproof cover) The basic structure of the soundproof cover 1a will be described with reference to Fig. 1. The soundproof cover 1a encloses an object (not shown) and prevents the transmission of sound and vibrations originating from the object. The object is, for example, a motor or engine that is a power source of a vehicle, an intake manifold, an air compressor, etc.

[0011] 1 shows a case where the target object is a motor for a vehicle (not shown). For ease of explanation, a cylindrical motor is shown with the drive shaft, wiring, etc. omitted, but the target object may have any shape. The soundproof cover 1a surrounds the outer periphery of the motor, which is the target object. In this embodiment, the soundproof cover 1a surrounds the entire outer periphery of the target object. The surrounded area can be set appropriately depending on the specific location of sound or vibration generation in the target object, the placement space, etc.

[0012] The soundproof cover 1a is composed of a first divided body 2a and a second divided body 4a. The first divided body 2a surrounds approximately one half of the outer peripheral surface of the motor. The second divided body 4a surrounds approximately the other half of the outer peripheral surface of the motor.

[0013] The first divided body 2a is made of a foamed resin. Examples of foamed resin that can be used include urethane foam, acrylic foam, silicone foam, styrene foam, foamed olefin (foamed PP, foamed PE), foamed PVC, foamed EVA, and foamed PA. For example, it is preferable to use a foamed resin having an Asker C hardness of 60 to 90 degrees.

[0014] The second divided body 4a is made of a foamed resin. Examples of foamed resin that can be used include urethane foam, acrylic foam, silicone foam, styrene foam, foamed olefin (foamed PP, foamed PE), foamed PVC, foamed EVA, and foamed PA. For example, it is preferable to use a foamed resin having an Asker C hardness of 60 to 90 degrees.

[0015] (2. Components of the soundproof cover of the first example) The constituent members of the soundproof cover 1a of the first example will be described with reference to Figures 2 to 3. The soundproof cover 1a is composed of a first divided body 2a shown in Figure 2 and a second divided body 4a shown in Figure 3.

[0016] The first divided body 2a is composed of a first main body portion 20a that houses one semi-cylindrical portion corresponding to the divided shape when a cylindrical motor (not shown), which is the object, is divided into approximately two along a first direction that is the axial direction of a drive shaft (not shown). The first main body portion 20a has a concave inner surface that corresponds to the outer shape of the semi-cylindrical portion of the motor, and the area on the opening end side including the opening surface (first opening surface 22) is the first frame portion 21a. The first main body portion 20a has a predetermined thickness, and the first opening surface 22 of the first frame portion 21a is a horizontal surface corresponding to the thickness of the first main body portion 20a.

[0017] The first opening surface 22 is configured by a pair of first long sides 23 arranged parallel to the first direction, and a pair of first short sides 24 respectively connecting both end portions of the pair of first long sides 23. In this embodiment, the connection portions between the pair of first long sides 23 and the pair of first short sides 24 are formed as arc surfaces with rounded corners.

[0018] The first main body portion 20a is formed with a pair of shaft support portions 25 extending outward from an outer surface including one of the first long sides 23 of the first frame portion 21a along a second direction perpendicular to the first direction. The pair of shaft support portions 25 are integrally molded with the first frame portion 21a. The pair of shaft support portions 25 are formed flush with the first opening surface 22 of the first frame portion 21a, and a portion of the first opening surface 22 connecting the pair of shaft support portions 25 in the first direction is a first recessed portion 26 recessed toward the housing space of the first main body portion 20a. The first recessed portion 26 is formed in a recessed shape corresponding to the outer shape of a first bearing portion 46 of the second divided body 4a described later.

[0019] A hinge shaft 27 extending in the first direction is formed on the outer tip side of the pair of shaft support parts 25. The hinge shaft 27 is integrally formed with the pair of shaft support parts 25 and supported by the pair of shaft support parts 25. The hinge shaft 27 is a rod-shaped member with a circular axial cross section, and both ends are expanded diameter parts 28 whose diameter is expanded in the radial direction. The hinge shaft 27 is fitted into bearing parts 46, 48 of the second divided body 4a, which will be described later, and functions as a rotation shaft that enables the first divided body 2a and the second divided body 4a to rotate.

[0020] A first engagement portion 30 that protrudes toward the opening direction of the first frame portion 21a is formed at the center in the first direction of the other first long side 23 of the first frame portion 21a. The first engagement portion 30 is integrally formed with the first frame portion 21a. In this embodiment, the first engagement portion 30 is formed of a protrusion.

[0021] Specifically, the protrusion is formed in a gate shape including a pair of first leg portions 31 protruding from the first opening surface 22 of the first frame portion 21a and a first connecting portion 32 connecting the tips of the pair of first leg portions 31. In a cross-sectional view in the first direction (see Figs. 6 and 7), the pair of first leg portions 31 are slightly tapered toward the base side at the tip side, and are formed so that the tip side is inclined toward the outer edge side of the first frame portion 21a relative to the base side, and the tip side is disposed outside the first frame portion 21a. The tip portion of the first connecting portion 32 in the protruding direction is curved and convex in the protruding direction. In addition, the edge on the outer edge side of the first frame portion 21a at the tip portion is formed as a flange portion 33 that protrudes toward the outer edge side.

[0022] A pair of first auxiliary engagement portions 34 are formed in the first main body portion 20a so as to sandwich the first engagement portion 30 between them in the first direction. The pair of first auxiliary engagement portions 34 are molded integrally with the first divided body 2a. In this embodiment, the first auxiliary engagement portions 34 are extended on the outer surface of the first frame portion 21a of the first main body portion 20a and are formed so as to extend to a position beyond the first opening surface 22. In the cross-sectional view in the first direction (see FIG. 10 ), the first auxiliary engagement portions 34 are connected at their root portions on the inner edge side of the extension portion extending from the first opening surface 22 to the first opening surface 22 by a first tapered surface 35.

[0023] The second divided body 4a is composed of a second main body portion 40a that houses the other semi-cylindrical portion corresponding to the divided shape when a cylindrical motor (not shown), which is the object, is divided into approximately two along the first direction of the drive shaft (not shown). The second main body portion 40a has a concave inner surface that corresponds to the outer shape of the semi-cylindrical portion of the motor, and the region on the opening end side including the opening surface (second opening surface 42) is the second frame portion 41a.

[0024] The second opening surface 42 of the second frame portion 41a is configured by a pair of second long sides 43 arranged parallel to the first direction, and a pair of second short sides 44 respectively connecting both end portions of the pair of second long sides 43. In this embodiment, the connection portions between the pair of second long sides 43 and the pair of second short sides 44 are formed as arc surfaces with rounded corners.

[0025] The second main body portion 40a is formed with a bearing portion 45 extending outward along one side of the second direction perpendicular to the first direction from an outer surface including one second long side 43 of the second frame portion 41a. The bearing portion 45 is integrally molded with the second frame portion 41a. In this embodiment, the bearing portion 45 is composed of a first bearing portion 46 extending from the center in the first direction of one second long side 43, and a pair of second bearing portions 48 extending from both ends in the first direction of the one second long side 43.

[0026] The first bearing portion 46 is formed with a first mating recess 47 on its extended tip end, the first mating recess 47 having a C-shaped cross section in the first direction (see FIG. 6) that opens toward the housing space of the second main body portion 40a. The inner surface of the first mating recess 47 is a concave curved surface that corresponds to the semicircular shape obtained when the hinge shaft 27 of the first divided body 2a is divided into two in the first direction. Meanwhile, the pair of second bearing portions 48 are formed with second mating recesses 49 on their extended tip end, the second mating recesses 49 having a C-shaped cross section in the first direction (see FIG. 7) that opens toward the direction facing the first mating recess 47. The inner surface of the second mating portion is a concave curved surface that corresponds to the semicircular shape obtained when the hinge shaft 27 of the first divided body 2a is divided into two in the first direction.

[0027] As described below, the first bearing portion 46 and the pair of second bearing portions 48 are engaged with each other in a state in which the hinge axis 27 of the first section 2a is clamped between the first mating recess 47 of the first bearing portion 46 and each of the second mating recesses 49 of the pair of second bearing portions 48, which are arranged apart in the first direction, and serve to hold the hinge axis 27 so that the first section 2a and the second section 4a can rotate.

[0028] The second main body portion 40a is formed with a second engagement portion 50 extending outward from an outer surface including the other second long side 43 of the second frame portion 41a along the other side of the second direction perpendicular to the first direction. The second engagement portion 50 is integrally molded with the second frame portion 41a. As described below, the second engagement portion 50 is formed at a position facing the first engagement portion 30 of the first division body 2a when the first division body 2a and the second division body 4a are assembled and an object is enclosed.

[0029] In this embodiment, the second engagement portion 50 is configured by a through hole formed in the center in the first direction of the other second long side. Specifically, the second engagement portion 50 is formed in a gate shape consisting of a pair of second legs 51 extending flush with the second opening surface 42 of the second frame portion 41a and a second connecting portion 52 connecting the tips of the pair of second legs 51. The portion of the second opening surface 42 connecting the pair of second legs 51 in the first direction is a second recess 53 recessed toward the storage space of the second main body portion 40a, and the portion of the region surrounded by the pair of second legs 51, the second connecting portion 52, and the second recess 53 that opens in the opening direction of the second frame portion 41a is formed as a through hole. The second recess 53 is formed in a recessed shape that can accommodate the first engagement portion 30 of the first divided body 2a.

[0030] A pair of second auxiliary engagement parts 54 are formed on the second main body part 40a so as to sandwich the second engagement part 50 between them in the first direction. The pair of second auxiliary engagement parts 54 are molded integrally with the second divided body 4a. As described below, the pair of second auxiliary engagement parts 54 are formed at positions facing the pair of first auxiliary engagement parts 34 of the first divided body 2a when the first divided body 2a and the second divided body 4a are assembled and an object is enclosed.

[0031] In this embodiment, the second auxiliary engagement portion 54 is configured by a recess that is recessed toward the accommodation space side of the second main body portion 40a in the outer regions in the first direction adjacent to the pair of second leg portions 51 of the second engagement portion 50. Specifically, in a cross-sectional view in the first direction (see FIG. 10), the second auxiliary engagement portion 54 is configured as a recess whose depth increases from the inner edge side toward the outer edge side of the second opening surface 42 and whose outer edge side is open. The inner edge side and the outer edge side of the second opening surface 42 are connected by a convex portion that is convex toward the first auxiliary engagement portion 34 side, and the top of the convex portion is configured as a second tapered surface 55.

[0032] (3. Assembly state of the soundproof cover in the first example) The assembled state of the first example soundproof cover 1a will be described with reference to Figures 4 to 7. When enclosing the soundproof cover 1a, the first divisional body 2a and the second divisional body 4a are assembled together.

[0033] For example, in a state in which the opening direction of the first frame portion 21a of the first division 2a and the opening direction of the second frame portion 41a of the second division 4a are arranged in the same direction, the hinge shaft 27 of the first division 2a is fitted into the bearing portion 45 of the second division 4a. At this time, the bearing portion 45 is composed of a first bearing portion 46 and a pair of second bearing portions 48, and the first fitting recess 47 of the first bearing portion 46 and the second fitting recesses 49 of the pair of second bearing portions 48 are concave curved surfaces that open in the opposing direction, so that the hinge shaft 27 of the first division 2a is fitted in a state in which it is sandwiched between the first bearing portion 46 and the pair of second bearing portions 48.

[0034] The hinge shaft 27 of the first split body 2a is a rod-shaped member having a circular axial cross-section, and the first mating recess 47 of the bearing portion 45 of the second split body 4a and each of the second mating recesses 49 are concave curved surfaces corresponding to the semicircular shape obtained by dividing the axial cross-section of the hinge shaft 27 in half. Therefore, the second split body 4a can be rotated in a direction approaching the first split body 2a, with the hinge shaft 27 of the first split body 2a as the base axis.

[0035] In addition, the hinge shaft 27 of the first partition 2a is fitted in a clamped state between the first bearing portion 46, which is located in the center of the second frame portion 41a in the first direction, and the second bearing portions 48, which are located at both ends in the first direction, so that the hinge shaft 27 can be stably supported even if an uneven force is applied during rotation.

[0036] Furthermore, the hinge shaft 27 of the first split body 2a has both axial ends formed into enlarged diameter portions 28 which are larger than the inner diameters of the mating recesses of the bearing portion 45 of the second split body 4a, thereby preventing the second split body 4a from coming off the first split body 2a in the axial direction.

[0037] (4. Fixation state of the soundproof cover in the first example) The fixed state of the soundproof cover 1a of the first example will be described with reference to Figures 1, 8 to 10. The case where the soundproof cover 1a is fixed to surround a cylindrical motor (not shown), which is an object, will be described as an example.

[0038] With the hinge shaft 27 of the first division 2a fitted into the bearing portion 45 (first bearing portion 46, second bearing portion 48) of the second division 4a, half of the motor is housed in the first main body portion 20a of the first division 2a, and the second division 4a is rotated. When the second frame portion 41a of the second division 4a and the first frame portion 21a of the first division 2a are brought close to each other, the first engagement portion 30 (protrusion) of the first division 2a is engaged with the second engagement portion 50 (through hole) of the second division 4a. At this time, the pair of first auxiliary engagement portions 34 of the first division 2a is simultaneously engaged with the pair of second auxiliary engagement portions 54 of the second division 4a, and the first opening surface 22 of the second division 2a is abutted against the second opening surface 42 of the second division 4a.

[0039] As shown in Fig. 9, the flange 33 at the tip of the first engagement portion 30 (projection) inserted through the second engagement portion 50 (through hole) is locked to the second connection portion 52 of the second engagement portion 50. At this time, as shown in Fig. 10, the first tapered surface 35 of the pair of first auxiliary engagement portions 34 and the second tapered surface 55 of the pair of second auxiliary engagement portions 54 are arranged opposite to each other, and the second tapered surface 55 is in a state where it is inserted into the first tapered surface 35 side with respect to the extending portion of the pair of first auxiliary engagement portions 34. With this configuration, the movement of the second engagement portion 50 in the upward direction in Fig. 10 is suppressed, and the flange 33 of the first engagement portion 30 is made difficult to come off the second connection portion 52 of the second engagement portion 50.

[0040] 9, in the fixed state, the first bearing portion 46 of the second division 4a is housed in the first recess 26 of the first division 2a. Also, the first engagement portion 30 of the first division 2a is housed in the second recess 53 of the second engagement portion 50 of the second division 4a, so that the object is covered without any gaps.

[0041] (5. Effects) In the first main body portion 20a of the first divided body 2a, the hinge shaft 27 (shaft support portion 25) is integrally molded with the first main body portion 20a (first frame portion 21a), and the components including the first main body portion 20a and the hinge shaft 27 (shaft support portion 25) are formed of foamed resin. Similarly, in the second main body portion 40a of the second divided body 4a, the bearing portion 45 is integrally molded with the second main body portion 40a (second frame portion 41a), and the components including the second main body portion 40a and the bearing portion 45 are formed of foamed resin. Therefore, the soundproof cover 1a of the first example can be made lighter in weight because all of the components are molded from foamed resin.

[0042] In addition, the first and second divisions 2a and 4a are connected by fitting the hinge shaft 27 of the first division 2a with the bearing portion 45 (first bearing portion 46, second bearing portion 48) of the second division 4a, thereby increasing the strength of the connecting portion and improving handling strength compared to when the first and second divisions 2a and 4a are connected with a thin-walled hinge portion.

[0043] Furthermore, in the fixed state, the first bearing portion 46 of the second partition 4a is accommodated in the first recess 26 of the first main body portion 20a, and the first opening surface 22 of the first main body portion 20a and the second opening surface 42 of the first main body portion 4a are abutted and fixed. As a result, there is no risk of the hinge portion opening and creating a gap between the two opening surfaces, as occurs when the first partition 2a and the second partition 4a are connected with a thin hinge portion, and the soundproofing effect can be stably maintained.

[0044] In particular, when the first divided body 2a and the second divided body 4a are molded from a foamed resin with an Asker C hardness of 60 to 99 degrees, the strength of the support structure of the hinge shaft 27 can be increased and stable rotation can be achieved, compared to when the first divided body 2a and the second divided body 4a are molded from a foamed resin with an Asker C hardness of less than 60 degrees. In addition, the strength of the main body that houses the object is also increased, and depending on the usage environment, resistance to flying debris and the like can be increased.

[0045] Depending on the vibration (sound) characteristics of the object and the usage environment, the first divided body 2a and the second divided body 4a can be molded from a foamed resin with an Asker C hardness of less than 60 degrees. In this case, the strength of the support structure for the hinge shaft 27 is inferior compared to when it is molded from a foamed resin with an Asker C hardness of 60 to 99 degrees, but the soundproofing performance can be adjusted according to the vibration (sound) characteristics of the object.

[0046] (6. Modifications) The first divided body 2a of the soundproof cover 1a in the first example is configured to support the hinge shaft 27 by a pair of shaft support parts 25, but may be configured to have one or three or more shaft support parts. In addition, the shape of the shaft support part and its axial position can be set arbitrarily depending on the size of the object and the arrangement space.

[0047] The second divided body 4a of the soundproof cover 1a in the first example is configured to support the hinge shaft 27 with three bearing portions 45 (a first bearing portion 46 and a pair of second bearing portions 48), but the bearing portions may be configured to have a first bearing portion and one second bearing portion, or to have two or more first bearing portions and two or more second bearing portions. In this case, the shape, axial position, and other factors can be set arbitrarily according to the size of the object and the arrangement space.

[0048] In the soundproof cover 1a of the first example, the second engagement portion 50 of the second divided body 4a is a through hole, but the second engagement portion 50 may be a recess surrounded by a pair of second leg portions 51, a second connecting portion 52, and a second recess 53. In this case, the outer diameter of the first engagement portion 30 (protrusion) of the first divided body 2a can be made larger than the inner diameter of the recess of the second engagement, and the first engagement portion 30 and the second engagement portion 50 can be fixed by press-fitting. In addition, the first engagement portion 30 and the second engagement portion 50 may have any shape as long as they are engaged or fitted with each other. In addition, the first engagement portion 30 and the second engagement portion 50 can be provided at any position of the first frame portion 21a and the second frame portion 41a depending on the arrangement space of the target object.

[0049] In the first example of the soundproof cover 1a, the first division 2a is provided with the first engagement portion 30 and a pair of first auxiliary engagement portions 34, while the second division 4a is provided with the second engagement portion 50 and a pair of second auxiliary engagement portions, but the auxiliary engagement portions may not be provided. Also, the engagement portions and auxiliary engagement portions may not be provided. In this case, a fixing method such as a belt can be used to wrap the cover, or a flange can be provided on the first frame portion 21a of the first division 2a and the second frame portion 41a of the second division 4a and the flange can be fixed with a clip.

[0050] When the first division 2a and the second division 4a of the first example soundproof cover 1a are molded from a foamed resin having an Asker C hardness of 60 to 99 degrees, a foamed resin layer having an Asker C hardness of less than 60 degrees can be laminated inside the first main body portion 20a and the second main body portion 40a.

[0051] (7. Soundproof cover of the second example) In the soundproof cover 1a of the first example, the constituent members of the first divided body 2a and the second divided body 4a are molded from the same foamed resin, but in the soundproof cover 1b of the second example, the constituent members are molded from different foamed resins. The soundproof cover 1b of the second example will be described with reference to Fig. 11. The same reference numerals are used for the same constituent members as the soundproof cover 1a of the first example.

[0052] The first divided body 2b of the soundproof cover 1b has a first main body portion 20b and a first frame portion 21b which are separate members. A shaft support portion 25 and a hinge shaft 27 are integrally formed with the first frame portion 21b.

[0053] The first main body portion 20b is molded from a foamed resin (first foamed resin) having an Asker C hardness of 1 to 60 degrees. On the other hand, the first frame portion 21b including the hinge shaft 27 (shaft support portion 25) is molded from a foamed resin (second foamed resin) having an Asker C hardness of 60 to 99 degrees. Note that, one of the first main body portion 20b or the first frame portion 21b including the hinge shaft 27 (shaft support portion 25) is molded in advance as an insert material, and with the insert material placed in a molding die for the other, the other material is foam-molded, thereby integrating the two components.

[0054] The second divided body 4b of the soundproof cover 1b has a second main body portion 40b and a second frame portion 41b formed as separate members. A bearing portion 45 (a first bearing portion 46 and a pair of second bearing portions 48) is integrally formed with the second frame portion 41b.

[0055] The second main body portion 40b is molded from a foamed resin (first foamed resin) having an Asker C hardness of 1 to 60 degrees. Meanwhile, the second frame portion 41b including the bearing portion 45 (first bearing portion 46, a pair of second bearing portions 48) is molded from a foamed resin (second foamed resin) having an Asker C hardness of 60 to 99 degrees. Note that, one of the second main body portion 40b or the second frame portion 41b including the bearing portions 45 is molded in advance as an insert material, and with the insert material placed in a molding die for the other, the other material is foam-molded, thereby integrating the two components.

[0056] In the second example soundproofing member, the part that rotatably connects the first division 2b and the second division 4b (hinge axis 27 (axis support portion 25), bearing portion 45) is molded from a foamed resin (first foamed resin) having an Asker C hardness of 60 to 99 degrees, thereby increasing the strength of the connecting portion and enabling stable rotational movement.

[0057] In addition, since the main body portion (first main body portion 20b, second main body portion 40b) that houses the object is molded from a foamed resin (first foamed resin) having an Asker C hardness of 1 to 60 degrees, the soundproofing performance can be adjusted according to the vibration (sound) characteristics of the object. [Explanation of symbols]

[0058] 1a, 1b: soundproof cover, 2a, 2b: first divided body, 4a, 4b: second divided body, 20a, 20b: first main body part, 21a, 21b: first frame part, 25: shaft support part, 27: hinge shaft, 30: first engagement part (protrusion), 40a, 40b: second main body part, 41a, 42b: second frame part, 45: Bearing part, 50: Second engaging part (transparent)

Claims

1. A soundproof cover for enclosing an object, a first divided body formed of a foamed resin; a second division body formed of a foamed resin, the first division body includes a hinge shaft formed of a foamed resin and a first engagement portion formed of a foamed resin, the second division body is made of a foamed resin and includes a bearing portion that is fitted onto the hinge shaft to rotatably support the second division body and the first division body, and also includes a second engagement portion that is made of a foamed resin; The first divisional body and the second divisional body are fixed to each other by the first engagement portion and the second engagement portion being engaged with each other. The soundproof cover, wherein the first division, the second division, the hinge shaft, the first engagement portion, the bearing portion, and the second engagement portion are formed from the same foamed resin having an Asker C hardness of 60 to 99 degrees.

2. the first divided body includes a first main body portion surrounding a part of the object, a shaft support portion extending from the first main body portion, and the rod-shaped hinge shaft supported by the shaft support portion, The second divided body includes a second main body portion surrounding another portion of the object, and the bearing portion extending from the second main body portion, The bearing portion includes a first bearing portion having a first mating recess and a second bearing portion having a second mating recess, The soundproof cover according to claim 1 , wherein the rod-shaped hinge shaft is fitted in a state in which it is sandwiched between the first fitting recess and the second fitting recess.

3. The soundproof cover according to claim 2 , wherein the first bearing portion and the second bearing portion are arranged apart from each other in an axial direction of the hinge shaft.

4. The bearing portion includes two of the second bearing portions, The soundproof cover according to claim 3 , wherein the first bearing portion is disposed between two of the second bearing portions.

5. The soundproof cover according to any one of claims 1 to 4, wherein the hinge shaft has enlarged diameter portions at both ends in the axial direction.

6. The first engagement portion is a protrusion protruding in a direction in which the second division body is assembled, the second engagement portion is a through hole into which the protrusion is engaged when the first division body and the second division body are assembled, a first auxiliary engagement portion disposed adjacent to the first engagement portion in a first direction parallel to an axial direction of the hinge shaft, The second segment is formed with a second auxiliary engagement portion that is disposed adjacent to the second engagement portion in the first direction and engages with the first auxiliary engagement portion in the assembled state, The soundproof cover according to any one of claims 1 to 5, wherein the first auxiliary engagement portion and the second auxiliary engagement portion are opposed to each other in an engaged state and are each formed with a tapered surface that inclines from the first auxiliary engagement portion side to the second auxiliary engagement portion side as it moves from the inside to the outside of the soundproof cover, thereby suppressing movement of the through hole in the direction away from the protrusion in the assembled state.

7. A soundproof cover for enclosing an object, comprising a first division body and a second division body, the first divided body includes a first main body portion surrounding a portion of the object, and a first frame member disposed on an opening surface side of the first main body portion and having a hinge shaft extending from the frame member; the second divided body includes a second main body portion surrounding another portion of the object, and a frame member disposed on an opening surface side of the second main body portion, the second frame member extending from the frame member and having a bearing portion that engages with the hinge shaft and rotatably supports the second divided body and the first divided body, The first body portion and the second body portion are molded from a first foaming resin, The soundproof cover, wherein the first frame portion and the second frame portion are molded from a second foamed resin having a higher hardness than the first foamed resin.

8. The first foaming resin has an Asker C hardness of 1 to 60 degrees, The soundproof cover according to claim 7, wherein the second foamed resin has an Asker C hardness of 60 to 99 degrees.

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