Sound insulation and heat dissipation cover, cover member, and method for manufacturing sound insulation and heat dissipation cover

Abstract

A sound insulation and heat dissipation cover (3) covers an object (2), the sound insulation and heat dissipation cover (3) is provided with a heat dissipation contact surface (10), the heat dissipation contact surface (10) is provided with a contact part (12) in contact with the object (2), the density of the sound insulation and heat dissipation cover (3) is 0.1-2.0 g / cm < 3 >, the thermal conductivity is 0.1-2.0 W / mK, and the maximum height roughness (Rz) of the heat dissipation contact surface (10) is 50-300 [mu] m. By means of an air layer formed between the surface of the object (2) and the heat dissipation contact surface (10) of the sound insulation and heat dissipation cover (3), the contact area between the surface of the object (2) and the heat dissipation contact surface (10) of the sound insulation and heat dissipation cover (3) can be reduced, vibration received by the sound insulation and heat dissipation cover (3) from the surface of the object (2) can be suppressed, and secondary radiation sound from the sound insulation and heat dissipation cover (3) can be suppressed. Therefore, the sound insulation property of the object (2) can be improved.

Description

Technical Field

[0001] The invention relates to a sound insulation and heat dissipation cover, a cover component, and a method for manufacturing the sound insulation and heat dissipation cover. Background Art

[0002] In the past, it is known to install a cover containing a sound absorbing material in a vibration source such as an engine or a motor of a vehicle. Patent document 1 describes a cover covering an object (vibration source). The cover absorbs the sound emitted from the object. Furthermore, an air layer is formed as a damping layer between the object and the cover. The sound is further damped by the air layer.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2020-101101 Summary of the invention

[0006] Problems to be solved by the invention

[0007] Objects (vibration sources) such as engines and motors may generate heat. In this case, there is a risk that the heat generated from the object will accumulate due to the air layer formed between the object and the cover, thereby reducing the heat dissipation performance of the object.

[0008] The present invention has been made in view of the above background, and attempts to provide a sound-insulating heat-dissipating cover, a cover member, and a method for manufacturing the sound-insulating heat-dissipating cover with improved heat dissipation performance.

[0009] Means used to solve problems

[0010] A first aspect of the present invention is a sound-insulating heat-dissipating cover that covers an object, wherein:

[0011] The sound insulation heat dissipation cover includes a heat dissipation contact surface having a contact portion that contacts the object.

[0012] The density of the sound insulation and heat dissipation cover is 0.1-2.0 g / cm 3 ,

[0013] The thermal conductivity of the sound insulation and heat dissipation cover is 0.1 to 2.0 W / mK.

[0014] The maximum height roughness of the heat dissipation contact surface is 50-300 μm.

[0015] A second aspect of the present invention is a cover member, wherein:

[0016] The cover member includes: a sound insulation heat dissipation cover, which is the sound insulation heat dissipation cover involved in the above-mentioned first aspect, and the sound insulation heat dissipation cover further includes a heat dissipation surface on the side opposite to the heat dissipation contact surface; and

[0017] a reinforcing member, which is formed of a material having a greater hardness than the sound insulation heat dissipation cover, and covers the sound insulation heat dissipation cover from the heat dissipation surface side of the sound insulation heat dissipation cover,

[0018] The sound insulation and heat dissipation cover also has:

[0019] a pair of first mounting portions formed near both ends of the heat dissipation contact surface in a first direction; and

[0020] a heat dissipation region formed between the pair of first mounting portions,

[0021] The reinforcing member comprises:

[0022] a pair of second mounting portions, which are formed near both ends of the first direction and are mounted on the pair of first mounting portions, respectively; and

[0023] a cross-linking portion that cross-links the pair of second mounting portions and has a plurality of through holes,

[0024] The heat dissipation contact surface is formed at least at a position overlapping with the heat dissipation area in the thickness direction of the sound insulation heat dissipation cover.

[0025] A third aspect of the present invention is a method for manufacturing a soundproof heat dissipation cover, which is the method for manufacturing a soundproof heat dissipation cover according to the first aspect, wherein:

[0026] The method for manufacturing the sound insulation heat dissipation cover comprises a molding step in which a resin is injected into a mold having a rough surface for molding the heat dissipation contact surface and then the resin is cured, thereby molding the sound insulation heat dissipation cover.

[0027] The maximum height roughness of the rough surface is 50 to 300 μm.

[0028] Effects of the Invention

[0029] According to the first aspect of the present invention, the surface of the object and the heat dissipation contact surface of the sound insulation heat dissipation cover are in contact with each other via the contact portion, so that the heat generated from the object is transferred to the sound insulation heat dissipation cover via the contact portion.

[0030] According to the first aspect of the present invention, the maximum height roughness of the heat dissipation contact surface is greater than 50 μm, so a gap of at least 50 μm is formed between the surface of the object and the heat dissipation contact surface of the sound insulation heat dissipation cover. The air layer formed in the gap can reduce the contact area between the surface of the object and the heat dissipation contact surface of the sound insulation heat dissipation cover compared to the case where the maximum height roughness of the heat dissipation contact surface is less than 50 μm. As a result, the vibration received by the sound insulation heat dissipation cover from the surface of the object can be suppressed, and the secondary radiated sound from the sound insulation heat dissipation cover can be suppressed, so that the sound insulation of the object can be improved.

[0031] In addition, according to the first aspect of the present invention, the maximum height roughness of the heat dissipation contact surface is less than 300 μm, so the gap formed between the surface of the object and the heat dissipation contact surface of the sound insulation heat dissipation cover is narrow. Therefore, it is possible to suppress the accumulation of heat in the air layer, thereby suppressing the reduction of thermal conductivity from the object to the sound insulation heat dissipation cover.

[0032] According to the second aspect of the present invention, the sound insulation and heat dissipation cover can be positioned and the heat dissipation performance can be improved.

[0033] According to the third aspect of the present invention, a sound insulation and heat dissipation cover having excellent heat dissipation performance can be manufactured.

[0034] In addition, the reference numerals in parentheses in the technical solution indicate the corresponding relationship with the specific means described in the embodiment described later, and do not limit the technical scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a side view showing a state where the cover member according to Embodiment 1 is attached to an object.

[0036] Figure 2 1 is a diagram showing a cover member according to Embodiment 1. Figure 2 (a) is the main view. Figure 2 (b) in the figure is a bottom view.

[0037] Figure 3 It is a side view and a partially enlarged side schematic diagram showing the sound insulation and heat dissipation cover according to the first embodiment.

[0038] Figure 4 This is a partially enlarged cross-sectional view showing a state in which the cover member according to Embodiment 1 is attached to an object.

[0039] Figure 5 Yes means Figure 4 A schematic cross-sectional view of a portion of region R in FIG.

[0040] Figure 6 This is a flowchart showing the manufacturing process of the sound insulation and heat dissipation cover according to the first embodiment.

[0041] Figure 7 This is a cross-sectional view showing the state of the mold in the roughening step of the first embodiment.

[0042] Figure 8 This is a cross-sectional view showing a state where resin is injected into a mold in the injection step of the first embodiment.

[0043] Fig. 9 This is a cross-sectional view showing a state where the resin is molded in the molding step of the first embodiment.

[0044] Fig.10 This is a cross-sectional view showing a state where the sound insulation and heat dissipation cover is taken out from the mold in the mold-cutting step of the first embodiment.

[0045] Fig.11 This is a graph showing changes in noise level with respect to the frequency applied to the block for the sound insulation and heat dissipation covers of Examples 1 to 4 and Comparative Examples 1 and 2.

[0046] Fig.12 This is a graph showing changes in noise level with respect to the frequency applied to the block for the sound insulation and heat dissipation covers of Examples 5 to 8 and Comparative Examples 3 and 4.

[0047] Fig.13 This is a graph showing changes in the average noise level at a frequency of 4000 to 10000 Hz with respect to the maximum height roughness Rz for the sound insulation and heat dissipation covers of Examples 5 to 7.

[0048] Fig.14 This is a partially enlarged cross-sectional view showing a state in which the cover member according to Embodiment 1 is attached to an object. DETAILED DESCRIPTION

[0049] (Implementation Method 1)

[0050] 1. Basic Structure of Cover Member 1

[0051] Reference Figure 1 as well as Figure 2 The basic structure of the cover member 1 is described. The cover member 1 covers the object 2, and has the function of suppressing the transmission of the sound generated by the object 2 to the outside, and the function of dissipating the heat of the object 2 to the outside. The object 2 is set as a power source of a vehicle, for example. The power source is a driving motor for the vehicle, a driving engine for the vehicle, etc.

[0052] Here, in Figure 1 In FIG. 1 , the case where the object 2 is a driving motor of a vehicle is shown. Figure 1The driving motor has a cylindrical outer peripheral surface. However, the outer peripheral surface of the driving motor is not limited to a cylindrical surface, and may be appropriately formed into a concave-convex shape.

[0053] In this aspect, the drive motors are arranged so that the rotation axes of the drive motors coincide with each other in the left-right direction of the vehicle. Figure 1 The left side is the front of the vehicle, and the right side is the rear of the vehicle. However, the drive motor may be configured so that the rotation axis of the drive motor is aligned in the front-rear direction of the vehicle.

[0054] The cover member 1 covers the surface of the object 2, for example Figure 1 As shown, when the object 2 is a driving motor, the outer peripheral surface of the driving motor is covered. The cover member 1 covers the outer peripheral surface of the object 2 throughout the entire circumference, but may also have an uncovered portion in a part. In this embodiment, four cover members 1 cover the outer peripheral surface of the object 2. In this embodiment, the four cover members 1 cover the upper surface, the lower surface, the front surface, and the rear surface of the object 2. However, the number of cover members 1 may also be one to three, or five or more.

[0055] like Figure 2 As shown, the cover member 1 includes a sound insulation heat dissipation cover 3 and a reinforcement member 4. The sound insulation heat dissipation cover 3 is formed into a sheet shape by a first sound absorbing material having a sound absorption performance, and covers the surface of the object 2. Therefore, the sound insulation heat dissipation cover 3 has a sound absorption performance. The sound insulation heat dissipation cover 3 can also be pre-formed into a shape corresponding to the surface shape of the object 2. In addition, the sound insulation heat dissipation cover 3 can also be formed into a sheet shape by a deformable material, and installed on the surface of the object 2 while deforming. In addition to the sound absorption performance, the sound insulation heat dissipation cover 3 can also have a heat dissipation performance. The sound insulation heat dissipation cover 3 contacts the surface of the object 2, and includes a heat dissipation contact surface 10 that receives heat from the object 2, and a heat dissipation surface 11 on the side opposite to the heat dissipation contact surface 10.

[0056] As the first sound-absorbing material constituting the sound-insulating heat-dissipating cover 3, a material having excellent sound-absorbing performance is preferably used, for example, a material formed of a foamed resin is preferably used. As examples of foamed resins, polyurethane foam, acrylic foam, silicone foam, styrene foam, foamed olefin (foamed PP, foamed PE), foamed PVC, foamed EVA, foamed PA, etc. are used. Moreover, the Ascar C hardness of the foamed resin of the sound-insulating heat-dissipating cover 3 is 1 to 60 degrees. In addition, the sound-insulating heat-dissipating cover 3 can be formed of a non-foamed resin having sound-absorbing performance, or it can be formed of a metal. As examples of non-foamed resins, polyamide resins, olefin resins, styrene resins, polyurethane resins, silicone resins, acrylic resins, polyvinyl chloride resins, polyethylene resins, polyethylene terephthalate resins, polycarbonate resins, polypropylene resins, ABS resins, EVA resins, carbon fiber plastics (FRP, CFRP), etc. are used. In addition, as examples of metals, iron, aluminum, SUS, copper, and alloys thereof are used. However, a foamed resin with excellent sound-absorbing performance is preferred.

[0057] Furthermore, in order to make the sound insulation heat dissipation cover 3 have heat dissipation performance, the sound insulation heat dissipation cover 3 is preferably formed of a foamed resin containing a heat conductive material. It is preferable that the heat conductive material extends from the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 toward the heat dissipation surface 11. For example, when the heat conductive material is a heat conductive filler, the heat conductive filler is arranged from the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 toward the heat dissipation surface 11. Furthermore, the filling amount of the heat conductive material can be made different depending on the position of the sound insulation heat dissipation cover 3. For example, the rear surface of the vehicle is more difficult to cool than the front surface of the vehicle, so it is better to make the filling amount of the heat conductive material in the rear surface of the vehicle more than the filling amount of the front surface of the vehicle. In addition, the filling amount here means the filling amount per unit area in the surface direction of the sound insulation heat dissipation cover 3. In addition, when the heat conductive material is a metal plate, it can be set to be an insert molding extending from the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 toward the heat dissipation surface 11.

[0058] The density of the sound insulation and heat dissipation cover 3 is preferably 0.1 to 2.0 g / cm 3 The density can be measured by a known method.

[0059] The thermal conductivity of the sound insulation and heat dissipation cover 3 is preferably 0.1 to 2.0 W / mK, and more preferably 0.5 to 0.7 W / mK. The thermal conductivity can be measured by a known method.

[0060] The reinforcement member 4 covers the sound insulation heat dissipation cover 3 from the heat dissipation surface 11 side, and positions the sound insulation heat dissipation cover 3 on the object 2. The reinforcement member 4 is formed separately from the sound insulation heat dissipation cover 3 and is arranged on the heat dissipation surface 11 side of the sound insulation heat dissipation cover 3, thereby sandwiching the sound insulation heat dissipation cover 3 between the reinforcement member 4 and the object 2.

[0061] In addition, as a method of fixing the reinforcing member 4 to the object 2, for example, Figure 1 As shown, the reinforcing member 4 can be fixed to the object 2 by bolts 5. However, the method of fixing the reinforcing member 4 to the object 2 is not limited to bolt fastening, and for example, the reinforcing member 4 may be locked to a locking claw provided on the object 2.

[0062] The reinforcement member 4 is formed of a material having a hardness greater than that of the sound insulation heat dissipation cover 3. In this embodiment, the sound insulation heat dissipation cover 3 is formed of, for example, a foamed resin in a sheet shape. The Ascar C hardness of the foamed resin of the reinforcement member 4 is 60 to 99 degrees. In this way, when the sound insulation heat dissipation cover 3 is formed of the first sound absorbing material that does not have sufficient rigidity, the positioning effect of only positioning the sound insulation heat dissipation cover 3 to the object 2 is poor. In such a case, the sound insulation heat dissipation cover 3 can be reliably positioned to the object 2 by the reinforcement member 4.

[0063] Further, the reinforcing member 4 is formed of a material having a mass per unit volume (hereinafter, referred to as "unit mass") greater than the mass per unit volume of the sound insulation and heat dissipation cover 3. As described above, in order for the reinforcing member 4 to be able to exert a reinforcing function, the reinforcing member 4 is formed of a material having a unit mass greater than the unit mass of the sound insulation and heat dissipation cover 3 as a result.

[0064] The reinforcing member 4 may be formed of a second sound-absorbing material having sound-absorbing properties. As the second sound-absorbing material, a material having excellent sound-absorbing properties may be formed of, for example, a foamed resin. However, the foamed resin applied to the reinforcing member 4 is different from the foamed resin applied to the sound-insulating heat-dissipating cover 3. For example, as examples of foamed resins applied to the reinforcing member 4, polyurethane foam, acrylic foam, silicone foam, styrene foam, foamed olefin (foamed PP, foamed PE), foamed PVC, foamed EVA, foamed PA, etc. are applied. In addition, even if polyurethane foam is applied to the sound-insulating heat-dissipating cover 3 and the reinforcing member 4, the polyurethane foams of the two are of different types. The reinforcing member 4 is formed of a second sound-absorbing material, thereby improving the sound insulation of the cover member 1.

[0065] In addition, the reinforcing member 4 can be made of a material different from the second sound-absorbing material, such as foamed rubber, non-foamed resin, or metal. As examples of foamed rubber, foamed EPDM, foamed CR, foamed NBR / PVC, foamed ACM, etc. are used. In addition, as examples of non-foamed resins, polyamide resins, olefin resins, styrene resins, polyurethane resins, silicone resins, acrylic resins, polyvinyl chloride resins, polyethylene resins, polyethylene terephthalate resins, polycarbonate resins, polypropylene resins, ABS resins, EVA resins, carbon fiber plastics (FRP, CFRP), etc. are used. In addition, as examples of metals, iron, aluminum, SUS, copper, and alloys thereof are used. The reinforcing members in these cases are formed of rubber, resin, or metal having a hardness higher than that of the foamed resin. However, from the perspective of lightweighting, foamed resins are preferred.

[0066] When the reinforcing member 4 has a degree of flexibility that allows it to be flexibly deformed, the reinforcing member 4 can be deformed in a manner that fits the shape of the outer peripheral surface of the object 2 and can be attached to the outer peripheral surface of the object 2. In addition, when the reinforcing member 4 has a high hardness and is difficult to be flexibly deformed, the reinforcing member 4 can be pre-formed in a manner that fits the shape of the outer peripheral surface of the object 2. Thus, the reinforcing member 4 can be easily attached to the outer peripheral surface of the object 2.

[0067] 2. Detailed Structure of Cover Member 1

[0068] Reference Figure 1 to Figure 5 The detailed structure of the cover member 1 is described. Figure 1 As shown, the cover member 1 is formed in a shape corresponding to the surface shape of the object 2. However, for the sake of convenience, Figure 2 to Figure 5 A diagram showing a state where the cover member 1 is developed in a planar shape is shown, and the following description will be made using this diagram.

[0069] like Figure 2 (a) and Figure 2 As shown in (b) in the figure, the cover member 1 includes a sound insulation and heat dissipation cover 3 and a reinforcement member 4. The sound insulation and heat dissipation cover 3 and the reinforcement member 4 are described in detail below. The sound insulation and heat dissipation cover 3 is composed of only one sheet in this example. The cover member 1 is generally formed in a rectangular shape when viewed from above. However, the shape of the cover member 1 is not particularly limited and can be formed in any shape.

[0070] like Figure 2 (a) and Figure 2As shown in (b) of the figure, the sound insulation heat dissipation cover 3 is not particularly limited, and in this embodiment, it is formed roughly in a rectangular shape when viewed from above. The sound insulation heat dissipation cover 3 is formed in a sheet shape as a whole. When the sound insulation heat dissipation cover 3 is mounted on the object 2, it has a pair of first mounting portions 13 formed near the two ends of the object 2 in the axial direction (an example of the first direction), and a heat dissipation area 14 formed between the pair of first mounting portions 13. The heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 contacts in a manner that covers a portion of the surface of the object 2.

[0071] The heat conductive material included in the sound insulation heat dissipation cover 3 may be metal foils such as copper, stainless steel, steel, and aluminum, metal films such as aluminum vapor-deposited films, conductive fillers, and heat conductive resin films. Alternatively, metal foils, metal films, and resin films may be laminated.

[0072] In addition, when the sound insulation and heat dissipation cover 3 is formed of foamed resin, the cells of the foamed resin can be in a closed cell state with the cells closed, or in an open cell state with the cells opened, or in a state where the closed cell state and the open cell state are mixed.

[0073] The reinforcing member 4 is formed in a substantially rectangular shape in a plan view. The reinforcing member 4 is formed in a substantially same size as the sound insulation heat dissipation cover 3 in a plan view. The reinforcing member 4, when mounted on the object 2, includes a pair of second mounting portions 21 formed near both ends in the axial direction of the object 2, and a cross-linking portion 22 that cross-links the pair of second mounting portions 21.

[0074] The pair of second mounting portions 21 are respectively mounted on the pair of first mounting portions 13 of the sound insulation heat dissipation cover 3. The pair of second mounting portions 21 are opposite to the pair of first mounting portions 13, and have mounting surfaces 24 mounted on the pair of first mounting portions 13 by known means such as adhesives and double-sided tape 23 (see Figure 4 In this embodiment, the second mounting portion 21 is mounted on the first mounting portion 13 by means of a double-sided tape 23. In the axial direction of the object 2, the width dimension of the pair of second mounting portions 21 is smaller than the width dimension of the pair of first mounting portions 13.

[0075] The cross-linking portion 22 has a receiving recess 25 formed in a concave shape in a direction away from the sound insulation heat dissipation cover 3 on the surface on the side facing the sound insulation heat dissipation cover 3. In a state where the second mounting portion 21 of the reinforcement member 4 is mounted on the first mounting portion 13 of the sound insulation heat dissipation cover 3, the receiving recess 25 of the reinforcement member 4 is configured to accommodate the heat dissipation area 14 of the sound insulation heat dissipation cover 3. The second mounting portion 21 and the bottom wall 26 of the receiving recess 25 are connected by an inclined wall 27 expanding on the side of the second mounting portion 21. The bottom wall 26 of the receiving recess 25 has an inner surface 28 facing the sound insulation heat dissipation cover 3 and an outer surface 29 on the side opposite to the inner surface 28.

[0076] like Figure 2 As shown in (a) of FIG. 2 , the cross-linked portion 22 includes a plurality of through holes 31 penetrating the cross-linked portion 22. In this embodiment, the plurality of through holes 31 are formed in a slit shape extending in the axial direction of the object 2 and arranged in parallel at intervals in the circumferential direction of the object 2.

[0077] like Figure 4 As shown, when the cover member 1 is mounted on the object 2, the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 covers the surface of the object 2. The sound insulation heat dissipation cover 3 is pressed against the object 2 by the reinforcement member 4, thereby improving the close contact between the sound insulation heat dissipation cover 3 and the object 2, thereby improving the heat dissipation of the cover member 1.

[0078] like Figure 3 As shown, the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 is roughened. In addition, for the convenience of explanation, Figure 3 The concavo-convex shape is described with emphasis. Although not specifically mentioned, the concavo-convex shape may be emphasized in other drawings.

[0079] The maximum height roughness Rz of the heat dissipation contact surface 10 based on JIS B0601:2013 (ISO 4287:1997, Amd.1:2009) is 50 to 300 μm, preferably 60 to 250 μm, more preferably 70 to 250 μm, further preferably 80 to 250 μm, particularly preferably 110 to 200 μm, and most preferably 140 to 160 μm.

[0080] The maximum height roughness Rz is the sum of the maximum value of the peak height Zp and the maximum value of the valley depth Zv of the profile curve within the reference length (refer to Figure 3 ).

[0081] When the cover member 1 is attached to the object 2, the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 is formed at least at a position overlapping with the heat dissipation region 14 in the thickness direction of the sound insulation heat dissipation cover 3. The heat dissipation contact surface 10 may be formed as a region wider than the heat dissipation region 14.

[0082] When the cover member 1 is mounted on the object 2, the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 contacts the object 2 at the contact portion 12 (see Figure 4 as well as Figure 5). A gap is formed between the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 and the surface of the object 2 because the heat dissipation contact surface 10 is roughened. The air layer formed in the gap can reduce the contact area between the surface of the object 2 and the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3. As a result, the vibration received by the sound insulation heat dissipation cover 3 from the surface of the object 2 can be suppressed, and the secondary radiated sound from the sound insulation heat dissipation cover 3 can be suppressed, so that the sound absorption performance of the sound insulation heat dissipation cover 3 is improved.

[0083] On the other hand, it is also considered that the air layer formed in the gap between the surface of the object 2 and the heat dissipation contact surface 10 reduces the thermal conductivity from the object 2 to the sound insulation heat dissipation cover 3. However, as described above, the maximum height roughness of the heat dissipation contact surface 10 is less than 300 μm, so the reduction in thermal conductivity is suppressed.

[0084] Figure 5 Indicates that Figure 4 FIG. 1 is an enlarged cross-sectional view of a portion of the heat dissipation contact surface 10 enlarged in the region R of FIG. The sound insulation heat dissipation cover 3 includes a skin layer 3a and a foam layer 3b in order from the heat dissipation contact surface 10 side. The skin layer 3a is formed by contacting with the mold 40 and rapidly cooling when the sound insulation heat dissipation cover 3 is formed. In the skin layer 3a, the first sound absorbing material is not foamed. Therefore, the thermal conductivity of the skin layer 3a is higher than that of the foam layer 3b.

[0085] Although not shown in detail, the skin layer 3a is also formed on the heat dissipation surface 11 side of the sound insulation heat dissipation cover 3. In other words, the sound insulation heat dissipation cover 3 has a structure in which the foam layer 3b is sandwiched between the skin layer 3a on the heat dissipation surface 11 side and the skin layer 3a on the heat dissipation contact surface 10 side.

[0086] 3. Method for manufacturing sound insulation heat dissipation cover 3

[0087] Next, refer to Figure 6 to Figure 10 , an example of a method for manufacturing the sound insulation and heat dissipation cover 3 will be described. However, the method for manufacturing the sound insulation and heat dissipation cover 3 is not limited to the following description.

[0088] Figure 6 The flowchart shows the manufacturing process of the sound insulation and heat dissipation cover 3. The manufacturing process according to this embodiment includes a roughening process (S1), an injection process (S2), a molding process (S3), and a die-cutting process (S4).

[0089] First, a mold 40 is prepared for molding the sound insulation and heat dissipation cover 3. The mold 40 may be made of metal or resin.

[0090] like Figure 7As shown, the mold 40 includes a lower mold 41 and an upper mold 43 connected to the lower mold 41 via a hinge 42. In this embodiment, the lower mold 41 and the upper mold 43 are formed in the same shape. The upper mold 43 is configured to be able to rotate with the hinge 42 as an axis. By rotating the upper mold 43, the upper mold 43 is overlapped on the lower mold 41. However, the lower mold 41 and the upper mold 43 may be formed in different shapes. In addition, the hinge 42 may be omitted.

[0091] A lower concave portion 41a that is concave downward is formed on the upper surface of the lower mold 41. In a state where the upper mold 43 is superimposed on the lower mold 41, an upper concave portion 43a that is concave upward is formed on the lower surface of the upper mold 43. The cavity formed by the lower concave portion 41a of the lower mold 41 and the upper concave portion 43a of the upper mold 43 is filled with resin and cured, thereby forming the sound insulation and heat dissipation cover 3.

[0092] In this embodiment, the bottom surface of the lower concave portion 41a of the lower mold 41 is formed as the rough surface 41b forming the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3. However, the top surface of the upper concave portion 43a of the upper mold 43 may be formed as the rough surface 41b.

[0093] The maximum height roughness Rz of the rough surface 41b based on JIS B0601:2013 (ISO 4287:1997, Amd.1:2009) is 50 to 300 μm, preferably 60 to 250 μm, more preferably 70 to 250 μm, further preferably 80 to 250 μm, particularly preferably 110 to 200 μm, and most preferably 140 to 160 μm.

[0094] In this method, if Figure 6 As shown, a roughening step (S1) is performed to roughen the bottom surface of the lower concave portion 41a of the lower mold 41. The roughening step can be performed by any method such as sandblasting or texturing. However, when using a mold 40 with a rough surface 41b formed in advance, the roughening step can be omitted.

[0095] Sandblasting is a method of grinding a workpiece by spraying an abrasive mixed with compressed gas onto the workpiece. The abrasive is not particularly limited, and can be selected from metals (alumina, steel shot, steel sand, reduced iron powder, etc.), plastics (polyisobutylene, polyester fiber, nylon, etc.), and plants (walnuts, peaches, corn, etc.).

[0096] The texturing process is a process for forming a corrugated pattern by etching or laser processing the surface of the mold 40. For example, a film having an etching pattern formed thereon is attached to the surface of the metal mold 40 in advance, and etching is performed using chemicals, thereby replicating the pattern to the surface of the mold 40. In this way, the resin is molded using the mold 40 having the pattern replicated thereon, thereby replicating the pattern on the surface of the mold 40 to the resin. Alternatively, a laser beam is irradiated to the surface of the mold 40 made of metal or resin to cut the surface, thereby forming a pattern on the surface of the mold 40.

[0097] After the rough surface 41b is formed on the mold 40, the injection process (S2) is performed. Figure 8 As shown, in the injection step (S2), the upper mold 43 is opened with the hinge 42 as the axis, and a predetermined amount of liquid resin 50 is injected into the lower concave portion 41a of the lower mold 41. The amount of the resin 50 injected into the lower concave portion 41a can be appropriately adjusted by the foaming rate. The resin 50 may contain a thermal conductive material, or may not contain a thermal conductive material.

[0098] Next, the forming process (S3) is performed. Fig. 9 As shown, the upper mold 43 is rotated with the hinge 42 as the axis and overlapped with the lower mold 41. Thereafter, the mold 40 is heated to a predetermined temperature, whereby the foaming agent mixed in the resin 50 is foamed and the liquid resin 50 is cured. In this way, in the molding process (S3), the foaming process of the resin 50 and the curing process of the resin 50 are performed. Thus, a foamed resin is formed. At this time, the surface of the resin 50 is roughened corresponding to the shape of the rough surface 41b formed in the lower concave portion 41a of the lower mold 41.

[0099] The resin 50 expands due to foaming and fills the cavity formed by the lower concave portion 41 a and the upper concave portion 43 a .

[0100] When the resin 50 contacts the inner surface of the cavity, the resin 50 is rapidly cooled and solidified before foaming. Thus, in the resin 50, a skin layer 3a without voids is formed in the portion in contact with the inner surface of the cavity. After the skin layer 3a is formed, the resin inside the skin layer 3a solidifies more slowly than the skin layer 3a, so that foaming by the foaming agent proceeds and a foamed layer 3b is formed.

[0101] As described above, the skin layer 3a is formed in the area where the resin 50 contacts the inner surface of the cavity. Therefore, the skin layer 3a is formed in the portion of the sound insulation heat dissipation cover 3 that contacts the rough surface 41b of the lower mold 41, and the portion of the skin layer 3a that contacts the lower rough surface 41b forms the heat dissipation contact surface 10 having a predetermined maximum height roughness Rz.

[0102] Next, the demolding process (S4) is performed. Fig.10 As shown, after the resin is cured, the upper mold 43 is rotated and opened with the hinge 42 as the axis, and the resin is taken out from the lower mold 41. Thus, the sound insulation and heat dissipation cover 3 is completed.

[0103] 4. Examples and Comparative Examples

[0104] Next, examples of the present invention and comparative examples are described.

[0105] 4.1 Sandblasting

[0106] (Example 1)

[0107] In Example 1, a mold 40 made of metal is used. The metal used for the mold 40 is not particularly limited, and any metal such as aluminum, aluminum alloy, etc. can be used. In this Example 1, an aluminum mold 40 is used. Alumina (grain size 36) is used as an abrasive to sandblast the bottom surface of the lower concave portion 41a of the lower mold 41. As a result, a rough surface 41b with a maximum height roughness Rz of 48μm is formed on the bottom surface of the lower concave portion 41a of the lower mold 41. However, the particle size is based on JIS R 6001-1:2017 (ISO 8486-1).

[0108] A resin containing a heat conductive material is injected into the aluminum lower mold 41 formed with a rough surface 41b, and the resin is cured and foamed. Thus, the sound insulation heat dissipation cover 3 involved in Example 1 is manufactured. The thickness of the sound insulation heat dissipation cover 3 is 5 mm. The maximum height roughness Rz of the heat dissipation contact surface 10 of Example 1 is 105 μm.

[0109] The sound insulation heat dissipation cover 3 of Example 1 was arranged so that the heat dissipation contact surface 10 was in contact with the upper surface of the aluminum block, and the sound insulation heat dissipation cover 3 was fixed to the block. The block with the sound insulation heat dissipation cover 3 fixed was given a vibration of a predetermined frequency, and the sound leaking from the sound insulation heat dissipation cover 3 was detected by a microphone arranged above the sound insulation heat dissipation cover 3. The results are shown in Fig.11 .

[0110] (Example 2)

[0111] Next, the sound insulation heat dissipation cover 3 according to Example 2 was manufactured using an aluminum mold 40, except that silicon carbide (grain size 12) was used as the abrasive, in the same manner as in Example 1. The maximum height roughness Rz of the bottom surface of the lower concave portion 41a of the lower mold 41 of Example 2 was 82 μm. In addition, the maximum height roughness Rz of the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 of Example 2 was 206 μm.

[0112] The sound insulation performance of the sound insulation heat dissipation cover 3 of Example 2 was tested in the same manner as in Example 1. The results are shown in Fig.11 .

[0113] (Example 3)

[0114] Next, the sound insulation heat dissipation cover 3 according to Example 3 was manufactured by using an aluminum mold 40, except that alumina (grain size 16) having a smaller grain size than that of Example 1 was used as the abrasive. The maximum height roughness Rz of the bottom surface of the lower concave portion 41a of the lower mold 41 of Example 3 was 69 μm. In addition, the maximum height roughness Rz of the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 of Example 3 was 195 μm.

[0115] The sound insulation performance of the sound insulation heat dissipation cover 3 of Example 3 was tested in the same manner as in Example 1. The results are shown in Fig.11 .

[0116] (Example 4)

[0117] Next, using an aluminum mold 40, the sound insulation heat dissipation cover 3 according to Example 4 was manufactured in the same manner as in Example 1, except that alumina (grain size 8) with a smaller grain size than that of Example 3 was used as the abrasive. The maximum height roughness Rz of the bottom surface of the lower concave portion 41a of the lower mold 41 of Example 4 was 78 μm. In addition, the maximum height roughness Rz of the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 of Example 4 was 271 μm.

[0118] The sound insulation performance of the sound insulation heat dissipation cover 3 of Example 3 was tested in the same manner as in Example 1. The results are shown in Fig.11 .

[0119] (Comparative Example 1)

[0120] As Comparative Example 1, a predetermined frequency vibration was applied to an aluminum block, and the sound generated by the microphone was detected by a microphone arranged above the block. The results are shown in Fig.11 .

[0121] (Comparative Example 2)

[0122] As Comparative Example 2, a soundproof heat dissipation cover 3 whose heat dissipation contact surface 10 was not roughened was manufactured. Specifically, the soundproof heat dissipation cover 3 involved in Comparative Example 2 was manufactured using a metal mold 40 in which the inner surface of the lower concave portion 41a of the lower mold 41 and the inner surface of the upper concave portion 43a of the upper mold 43 were mirror-finished. The thickness of the soundproof heat dissipation cover 3 was 5 mm.

[0123] The sound insulation performance of the sound insulation heat dissipation cover 3 of Comparative Example 2 was tested in the same manner as in Example 1. The results are shown in Fig.11 .

[0124] (Results and Investigation)

[0125] Fig.11 This is a graph showing the frequency analysis of the noise level generated when white noise vibration is applied to the block using an HBK exciter (Type 4808). When white noise vibration with a frequency of 200 to 10,000 Hz is applied, the noise level of Examples 1 to 4 and Comparative Examples 1 to 2 becomes a mountain shape with a peak at 6,300 Hz.

[0126] In the range of 200 to 1250 Hz, there is no significant difference in the noise level between Examples 1 to 4 and Comparative Examples 1 and 2. When the noise level exceeds 1250 Hz, a difference begins to appear in the noise level.

[0127] For Examples 1 to 4, the noise level decreases in the frequency range of 2000 Hz to 4000 Hz. On the other hand, for Comparative Examples 1 to 2, the noise level increases in the frequency range of 2000 Hz to 4000 Hz. Therefore, in the frequency range of 3150 Hz or more, the noise level of Examples 1 to 4 becomes lower than the noise level of Comparative Examples 1 to 2.

[0128] In Examples 1 to 4, it is found that the noise level decreases as the maximum height roughness Rz of the heat dissipation contact surface 10 increases.

[0129] The maximum height roughness Rz of the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 involved in Examples 1 to 4 is formed to be 105 to 271 μm. As a result, a gap is formed between the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 and the surface of the block. It is believed that the air layer formed in the gap can reduce the contact area between the surface of the block and the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3, and can suppress the vibration received by the sound insulation heat dissipation cover 3 from the surface of the block, and suppress the secondary radiated sound from the sound insulation heat dissipation cover 3, thereby improving the sound insulation performance of the sound insulation heat dissipation cover 3.

[0130] 4.2 Texture processing

[0131] (Example 5)

[0132] In Example 5, a metal mold 40 was used. The bottom surface of the lower recessed portion 41a of the lower mold 41 was textured. The bottom surface of the lower recessed portion 41a of the lower mold 41 had a rough surface 41b having a maximum height roughness Rz of 50 μm.

[0133] Using the mold 40 formed with the rough surface 41b, the sound insulation heat dissipation cover 3 was produced in the same manner as in Example 1. The thickness of the sound insulation heat dissipation cover 3 was 5 mm. The maximum height roughness Rz of the heat dissipation contact surface 10 of Example 5 was 94 μm.

[0134] The sound insulation performance of the sound insulation heat dissipation cover 3 of Example 5 was examined in the same manner as in Example 1. The results are shown in Fig.12 In addition, Fig.12 In FIG. 1 , the maximum height roughness Rz of the heat dissipation contact surface 10 of Example 5 is expressed as 50 μm based on the maximum height roughness Rz of the metal mold for convenience of explanation.

[0135] (Example 6)

[0136] Next, the bottom surface of the lower recessed portion 41 a of the lower mold 41 was textured under conditions different from those of Example 5. A rough surface 41 b having a maximum height roughness Rz of 107 μm was formed on the bottom surface of the lower recessed portion 41 a of the lower mold 41 .

[0137] Using the mold 40 formed with the rough surface 41b, the sound insulation heat dissipation cover 3 was produced in the same manner as in Example 1. The thickness of the sound insulation heat dissipation cover 3 was 5 mm. The maximum height roughness Rz of the heat dissipation contact surface 10 of Example 6 was 141 μm.

[0138] The sound insulation performance of the sound insulation heat dissipation cover 3 of Example 6 was examined in the same manner as in Example 1. The results are shown in Fig.12 In addition, Fig.12 In FIG. 1 , regarding the maximum height roughness Rz of the metal mold, for convenience of explanation, the maximum height roughness Rz of the heat dissipation contact surface 10 of Example 6 is expressed as 100 μm.

[0139] (Example 7)

[0140] Next, the bottom surface of the lower recessed portion 41 a of the lower mold 41 was textured under conditions different from those of Example 5. A rough surface 41 b having a maximum height roughness Rz of 158 μm was formed on the bottom surface of the lower recessed portion 41 a of the lower mold 41 .

[0141] Using the mold 40 formed with the rough surface 41b, the sound insulation heat dissipation cover 3 was produced in the same manner as in Example 1. The thickness of the sound insulation heat dissipation cover 3 was 5 mm. The maximum height roughness Rz of the heat dissipation contact surface 10 of Example 7 was 182 μm.

[0142] The sound insulation performance of the sound insulation heat dissipation cover 3 of Example 7 was examined in the same manner as in Example 1. The results are shown in Fig.12 In addition, Fig.12 In the figure, regarding the maximum height roughness Rz of the metal mold, for convenience of explanation, the maximum height roughness Rz of the heat dissipation contact surface 10 of Example 7 is expressed as 150 μm.

[0143] (Example 8)

[0144] Next, the bottom surface of the lower recessed portion 41 a of the lower mold 41 was textured under conditions different from those of Example 5. A rough surface 41 b having a maximum height roughness Rz of 204 μm was formed on the bottom surface of the lower recessed portion 41 a of the lower mold 41 .

[0145] Using the mold 40 formed with the rough surface 41b, the sound insulation heat dissipation cover 3 was produced in the same manner as in Example 1. The thickness of the sound insulation heat dissipation cover 3 was 5 mm. The maximum height roughness Rz of the heat dissipation contact surface 10 of Example 8 was 203 μm.

[0146] The sound insulation performance of the sound insulation heat dissipation cover 3 of Example 8 was examined in the same manner as in Example 1. The results are shown in Fig.12 In addition, Fig.12 In the figure, regarding the maximum height roughness Rz of the metal mold, for convenience of explanation, the maximum height roughness Rz of the heat dissipation contact surface 10 of Example 8 is expressed as 200 μm.

[0147] (Comparative Example 3)

[0148] As Comparative Example 3, a predetermined frequency vibration was applied to an aluminum block, and the sound generated from the block was detected by a microphone arranged above the block. The results are shown in Fig.12 .

[0149] (Comparative Example 4)

[0150] As Comparative Example 4, a soundproof heat dissipation cover 3 whose heat dissipation contact surface 10 was not roughened was manufactured. Specifically, the soundproof heat dissipation cover 3 involved in Comparative Example 4 was manufactured using a metal mold 40 in which the inner surface of the lower concave portion 41a of the lower mold 41 and the inner surface of the upper concave portion 43a of the upper mold 43 were mirror-finished. The thickness of the soundproof heat dissipation cover 3 was 5 mm.

[0151] The sound insulation performance of the sound insulation heat dissipation cover 3 of Comparative Example 4 was tested in the same manner as in Example 1. The results are shown in Fig.12 .

[0152] (Results and Investigation)

[0153] The difference between the maximum height roughness Rz of the mold 40 and the maximum height roughness Rz of the sound insulation heat dissipation cover 3

[0154] In Examples 5 to 8, the maximum height roughness Rz of the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 is larger than the maximum height roughness Rz of the rough surface 41b of the mold 40. This is considered to be because the rough surface 41b formed by the texture processing of the mold 40 is formed by etching, so the edge is sharp. In addition, it is considered that the etching by the liquid chemical makes the concave and convex shape complicated and forms an overhanging shape. Therefore, it is considered that the molded sound insulation heat dissipation cover 3 is cut by the sharp edge portion, and the overhanging portion is peeled off while remaining in the mold 40. As a result, it is considered that the maximum height roughness Rz of the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 is larger than the maximum height roughness Rz of the rough surface 41b of the mold 40. In Example 8, the maximum height roughness Rz of the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 is approximately the same as the maximum height roughness Rz of the rough surface 41b of the mold 40.

[0155] (2) Noise level

[0156] Fig.12 This is a graph showing the frequency analysis of the noise level generated when white noise vibration is applied to the block using an HBK exciter (Type 4808). When white noise vibration with a frequency of 200 to 10,000 Hz is applied, the noise level of Examples 5 to 8 and Comparative Examples 3 to 4 becomes a mountain shape with a peak at 6,300 Hz.

[0157] There is no significant difference in noise level between Examples 5 to 8 and Comparative Examples 3 to 4 within the range of 200 to 1600 Hz. When the frequency exceeds 1600 Hz, there begins to be a difference in noise level between Examples 5 to 8 and Comparative Examples 3 to 4. When the frequency exceeds 4000 Hz, the noise level between Examples 5 to 8 and Comparative Examples 3 to 4 rises significantly, and a significant difference in noise level occurs.

[0158] In the case of Comparative Example 3 without the sound insulation heat dissipation cover 3, the noise level rises sharply when the frequency exceeds 4000 Hz, becomes the second highest noise level at 5000 to 8000 Hz, and becomes the highest noise level at 10000 Hz.

[0159] The noise level of Comparative Example 4 having the sound insulation and heat dissipation cover 3 without the texture is the highest in the range of 4000 to 8000 Hz. This is probably because the cover resonates due to the lack of texture, resulting in a higher noise level.

[0160] The noise levels of Examples 5 to 8 are lower than those of Comparative Examples 3 and 4 in the range of 5000 to 10000 Hz.

[0161] In the range of 4000-10000 Hz, the noise levels of Example 5 and Example 6 are almost the same. Compared with the noise levels of Example 5 and Example 6, the noise level of Example 7, whose maximum height roughness Rz is larger than that of Example 5 and Example 6, is smaller. Furthermore, the noise level of Example 8, whose maximum height roughness Rz is larger, becomes the smallest. In this way, as a whole, the noise level of the sound insulation heat dissipation cover 3 with a larger maximum height roughness Rz is smaller.

[0162] The maximum height roughness Rz of the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 is 94 μm in Example 5, 141 μm in Example 6, 182 μm in Example 7, and 203 μm in Example 8. Therefore, a gap is formed between the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 and the surface of the block. It is considered that the air layer formed in the gap can reduce the contact area between the surface of the block and the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3, and can suppress the vibration received by the sound insulation heat dissipation cover 3 from the surface of the block, and suppress the secondary radiated sound from the sound insulation heat dissipation cover 3, thereby improving the sound insulation performance of the sound insulation heat dissipation cover 3.

[0163] When the noise levels of Examples 5 to 8 in the frequency range of 4000 to 10000 Hz are compared, as a whole, the noise level decreases as the maximum height roughness Rz increases. It is believed that this is because the larger the gap between the heat dissipation contact surface 10 and the surface of the block, the smaller the contact area between the surface of the block and the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3, and the vibration received by the sound insulation heat dissipation cover 3 from the surface of the block, and the secondary radiated sound from the sound insulation heat dissipation cover 3, so that the absorption of the sound from the block is improved.

[0164] Reference Fig.13 The above points will be explained. Fig.13 This is a graph showing the average change in noise level in the frequency range of 4000 to 10000 Hz with respect to the maximum height roughness Rz in the noise level test. The three data in the figure correspond to Examples 5 to 7.

[0165] like Fig.13 As shown in FIG. 1 , as the maximum height roughness Rz increases, the average noise level decreases. In other words, it can be seen that as the maximum height roughness Rz increases, the sound insulation effect is improved.

[0166] Fig.13 The line indicates an average noise level of 66.7 [dB]. This value is the average noise level in the frequency range of 4000 to 10000 Hz of Comparative Example 3. It is understood that the sound insulation effects of Examples 5 to 7 are higher than the average noise level of Comparative Example 3.

[0167] 4.3 Heat dissipation

[0168] (Example 9)

[0169] Using an aluminum mold 40, the sound insulation heat dissipation cover 3 according to Example 9 was manufactured in the same manner as Example 1 except that alumina was used as the polishing agent. The maximum height roughness Rz of the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 of Example 9 was 150 μm.

[0170] The block with the sound insulation and heat dissipation cover 3 according to Example 9 attached was heated by a heat source at 100°C, and the heating was continued until the surface temperature of the sound insulation and heat dissipation cover 3 became constant. The surface temperature of the sound insulation and heat dissipation cover 3 according to Example 9 was 93.80°C.

[0171] (Comparative Examples 1-2)

[0172] In addition, the block with the sound insulation and heat dissipation cover 3 according to Comparative Example 1 and Comparative Example 2 attached thereto was heated by a heat source at 100°C, and the heating was continued until the surface temperature of the sound insulation and heat dissipation cover 3 became constant. The temperature of the sound insulation and heat dissipation cover 3 according to Comparative Example 1 was 98.40°C, and the temperature of the surface of the sound insulation and heat dissipation cover 3 according to Comparative Example 2 was 92.20°C.

[0173] (Results and Investigation)

[0174] According to the results of the heat dissipation test, Example 9 was 93.80° C., and Comparative Example 1 was 98.40° C. This is considered to be because the heat of the block was efficiently dissipated to the outside through the sound insulation heat dissipation cover 3 .

[0175] On the other hand, the result of Comparative Example 2 was 92.20°C. This is considered to be because the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 of Comparative Example 2 was not roughened, so the adhesion with the surface of the block was high, and heat was quickly conducted from the block to the sound insulation heat dissipation cover 3. However, as described above, since the noise level of Comparative Example 2 was almost the same as that of Comparative Example 1, it was not preferable.

[0176] On the contrary, it is considered that the result of Example 9 is 93.80° C., which does not have heat dissipation properties nearly at the same level as that of Comparative Example 2 which has not been roughened.

[0177] 5. Effects of this method

[0178] Next, the effects of this method are described. This method is a sound insulation heat dissipation cover 3 covering an object 2, comprising a heat dissipation contact surface 10 having a contact portion 12 that contacts the object 2, and a density of the sound insulation heat dissipation cover 3 of 0.1 to 2.0 g / cm 3 , the thermal conductivity is 0.1-2.0 W / mK, and the maximum height roughness Rz of the heat dissipation contact surface 10 is 50-300 μm.

[0179] According to this embodiment, the surface of the object 2 is in contact with the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 via the contact portion 12, so that the heat generated from the object 2 is conducted to the sound insulation heat dissipation cover 3 via the contact portion 12. Thus, the heat dissipation of the object 2 is improved.

[0180] According to this embodiment, since the maximum height roughness Rz of the heat dissipation contact surface 10 is greater than 50 μm, a gap of at least 50 μm is formed between the surface of the object 2 and the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3. The air layer formed in the gap can reduce the contact area between the surface of the object 2 and the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3, and can suppress the vibration received by the sound insulation heat dissipation cover 3 from the surface of the object 2, and suppress the secondary radiated sound from the sound insulation heat dissipation cover 3, so that the sound insulation of the object 2 can be improved.

[0181] In addition, according to this embodiment, since the maximum height roughness Rz of the heat dissipation contact surface 10 is less than 300 μm, the gap formed between the surface of the object 2 and the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 is narrow. Therefore, it is possible to suppress the accumulation of heat in the air layer, and thus it is possible to suppress the reduction of thermal conductivity from the object 2 to the sound insulation heat dissipation cover 3.

[0182] The maximum height roughness Rz of the heat dissipation contact surface 10 according to the present embodiment is preferably 60 to 250 μm, more preferably 110 to 200 μm.

[0183] According to this method, the maximum height roughness Rz of the heat dissipation contact surface 10 is greater than 110μm, so the contact area between the surface of the object 2 and the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 can be further reduced, the vibration received by the sound insulation heat dissipation cover 3 from the surface of the object 2 can be suppressed, and the secondary radiation sound from the sound insulation heat dissipation cover 3 can be suppressed, thereby suppressing the sound insulation of the object 2.

[0184] Furthermore, according to this embodiment, since the maximum height roughness Rz of the heat dissipation contact surface 10 is less than 200 μm, it is possible to further suppress a decrease in thermal conductivity from the object 2 to the sound insulation heat dissipation cover 3 .

[0185] According to this embodiment, the sound insulation heat dissipation cover 3 is formed of a foamed resin in a sheet shape, and further comprises: a foamed layer 3b having bubbles; and a skin layer 3a formed on the outside of the foamed layer 3b in the thickness direction and having fewer bubbles than the foamed layer 3b. The heat dissipation contact surface 10 is formed on the skin layer 3a.

[0186] According to this embodiment, the skin layer 3a has fewer bubbles and therefore has higher thermal conductivity than the foam layer 3b. The skin layer 3a with high thermal conductivity is in contact with the object 2, so the thermal conductivity from the object 2 to the sound insulation and heat dissipation cover 3 can be improved.

[0187] According to this embodiment, the sound insulation and heat dissipation cover 3 is formed in a sheet shape, and the sound insulation and heat dissipation cover 3 further includes a heat conductive material, and the heat conductive material extends in the thickness direction.

[0188] According to this aspect, the thermal conductivity of the sound insulation and heat dissipation cover 3 can be improved.

[0189] The thermal conductivity of the sound insulation and heat dissipation cover 3 according to this embodiment is preferably 0.5 to 0.7 W / mK. According to this embodiment, the thermal conductivity of the sound insulation and heat dissipation cover 3 can be further improved.

[0190] The cover member 1 according to the present embodiment is a soundproof heat dissipation cover 3, further comprising: the soundproof heat dissipation cover 3 having a heat dissipation surface on the side opposite to the heat dissipation contact surface 10; and a reinforcing member 4 formed of a material having a higher hardness than the soundproof heat dissipation cover 3, and covering the soundproof heat dissipation cover 3 from the heat dissipation surface side of the soundproof heat dissipation cover 3. The soundproof heat dissipation cover 3 further comprises: a pair of first mounting portions 13 formed at positions near both ends in the first direction along the heat dissipation contact surface 10; and a heat dissipation region 14 formed between the pair of first mounting portions 13. The reinforcing member 4 comprises: a pair of second mounting portions 21 formed at positions near both ends in the first direction and mounted on the pair of first mounting portions 13, respectively; and a cross-linking portion 22 cross-linking the pair of second mounting portions 21 and having a plurality of through holes 31. The heat dissipation contact surface 10 is formed at least at a position overlapping with the heat dissipation region 14 in the thickness direction of the soundproof heat dissipation cover 3.

[0191] According to this aspect, the sound insulation and heat dissipation cover 3 can be positioned and the heat dissipation performance can be improved.

[0192] The manufacturing method of the sound insulation heat dissipation cover 3 involved in this embodiment includes a molding step, in which a resin is injected into a mold 40 having a rough surface 41b for molding the heat dissipation contact surface 10 and then the resin is cured, thereby molding the sound insulation heat dissipation cover 3, and the maximum height roughness Rz of the rough surface 41b is 50 to 300μm.

[0193] The maximum height roughness Rz of the rough surface 41b of the mold 40 is 50 to 300 μm, thereby forming the maximum height roughness of the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 to correspond to the maximum height roughness Rz of the rough surface 41b. In addition, the corresponding means that the same case is included, and in different cases, the rough surface 41b, the maximum height roughness, and the maximum height roughness Rz of the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 also include a certain relationship.

[0194] According to this embodiment, in the forming step, the shape of the rough surface 41b of the mold 40 may be copied to the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3. In addition, according to this embodiment, in the forming step, the maximum height roughness Rz of the heat dissipation contact surface 10 of the sound insulation heat dissipation cover 3 may be larger than the maximum height roughness Rz of the rough surface 41b of the mold 40.

[0195] According to this embodiment, the method for manufacturing the sound insulation and heat dissipation cover 3 may include a roughening step of roughening at least a part of the inner surface of the mold 40 .

[0196] The roughening process may roughen at least a portion of the inner surface of the mold 40 by sandblasting. Alternatively, the roughening process may roughen at least a portion of the inner surface of the mold 40 made of metal or resin by texturing.

[0197] In this embodiment, a foaming step of foaming the resin 50 may be performed in the molding step.

[0198] In this embodiment, the resin 50 formed in the molding step may contain a thermally conductive material.

[0199] (Implementation Method 2)

[0200] Next, refer to Fig.14 Implementation method 2 is described below. Fig.14 As shown, the sound insulation heat dissipation cover 3 involved in this embodiment has a plurality of protrusions 15 formed in a manner protruding outward in the heat dissipation surface 11 of the heat dissipation area 14. The plurality of protrusions 15 are formed to extend in the surface direction of the sound insulation heat dissipation cover 3. In detail, the plurality of protrusions 15 are formed to extend in a straight line along the circumferential direction of the outer peripheral surface of the object 2 when the sound insulation heat dissipation cover 3 is mounted on the object 2. The plurality of protrusions 15 are arranged in parallel with intervals in the axial direction of the object 2 in the heat dissipation surface 11 of the heat dissipation area 14. In this embodiment, the plurality of protrusions 15 are formed to be arranged in parallel at equal intervals. However, the shape of the plurality of protrusions 15 can also be formed to be wavy in a top view. In addition, the plurality of protrusions 15 can also be formed to extend in the axial direction of the outer peripheral surface of the object 2, and can also be formed to extend in a direction inclined relative to the circumferential direction and axial direction of the outer peripheral surface of the object 2.

[0201] The thermal conductive material may be formed to extend continuously in the extending direction of the protrusion 15 at the front end side of the protrusion 15. Thus, the thermal conductive material is continuously arranged in the range from one end side to the other end side in the extending direction of the protrusion 15, thereby achieving high heat dissipation performance in the surface direction.

[0202] The heat dissipation surface of the sound insulation heat dissipation cover 3 according to the present embodiment is formed with a plurality of ridges 15 arranged in parallel with a gap. When the pair of second mounting portions 21 of the reinforcement member 4 are mounted to the pair of first mounting portions 13 of the sound insulation heat dissipation cover 3, the plurality of ridges 15 of the sound insulation heat dissipation cover 3 abut against the cross-linking portions 22 of the reinforcement member 4. According to the present embodiment, heat can be transferred from the ridges 15 to the reinforcement member 4 without the aid of an air layer, so that the heat dissipation of the cover member 1 can be further improved.

[0203] In addition, unless otherwise indicated, the same reference numerals as those used in the previous embodiments, among the reference numerals used in Embodiment 2 and below, represent the same structural elements as those in the previous embodiments.

[0204] The present invention is not limited to the above-described embodiments, and can be applied to various embodiments without departing from the gist of the invention.

Claims

1. A sound-insulating heat-dissipating cover (3), which covers an object (2), wherein: The sound insulation heat dissipation cover (3) has a heat dissipation contact surface (10), and the heat dissipation contact surface (10) has a contact portion (12) that contacts the object. The density of the sound insulation and heat dissipation cover (3) is 0.1-2.0 g / cm 3 , The thermal conductivity of the sound insulation and heat dissipation cover (3) is 0.1-2.0 W / mK. The maximum height roughness of the heat dissipation contact surface is 50-300 μm.

2. The sound insulation and heat dissipation cover according to claim 1, wherein: The maximum height roughness (Rz) of the heat dissipation contact surface is 60-250 μm.

3. The sound insulation and heat dissipation cover according to claim 2, wherein: The maximum height roughness of the heat dissipation contact surface is 110-200 μm.

4. The sound insulation and heat dissipation cover according to claim 1, wherein: The sound insulation and heat dissipation cover is formed into a sheet shape by a foamed resin. The sound insulation and heat dissipation cover also has: a foamed layer (3b) having bubbles; and a skin layer (3a) formed on the outside of the foamed layer in the thickness direction and having fewer bubbles than the foamed layer, The heat dissipation contact surface is formed on the skin layer.

5. The sound insulation and heat dissipation cover according to claim 1, wherein: The sound insulation and heat dissipation cover is formed in a sheet shape. The sound insulation and heat dissipation cover further comprises a heat conductive material, and the heat conductive material extends along a thickness direction.

6. The sound insulation and heat dissipation cover according to claim 1, wherein: The thermal conductivity is 0.5-0.7 W / mK.

7. A cover member (1), wherein: The cover member (1) comprises: A soundproof heat dissipation cover, which is the soundproof heat dissipation cover according to any one of claims 1 to 6, further comprising a heat dissipation surface (11) on the side opposite to the heat dissipation contact surface; and a reinforcing member (4) formed of a material having a greater hardness than the sound insulation heat dissipation cover, and covering the sound insulation heat dissipation cover from the heat dissipation surface side of the sound insulation heat dissipation cover, The sound insulation and heat dissipation cover also has: a pair of first mounting portions (13) formed near both ends of the heat dissipation contact surface in a first direction; and a heat dissipation region (14) formed between the pair of first mounting portions, The reinforcing member comprises: a pair of second mounting portions (21) formed near the two ends of the first direction and mounted on the pair of first mounting portions respectively; and a cross-linking portion (22) which cross-links the pair of second mounting portions and has a plurality of through holes (31), The heat dissipation contact surface is formed at least at a position overlapping with the heat dissipation area in the thickness direction of the sound insulation heat dissipation cover.

8. The cover member according to claim 7, wherein: A plurality of protrusions (15) are formed on the heat dissipation surface of the sound insulation heat dissipation cover and are arranged in parallel with each other at intervals. In a state where the pair of second mounting portions of the reinforcement member are mounted to the pair of first mounting portions of the sound insulation and heat dissipation cover, the plurality of protrusions of the sound insulation and heat dissipation cover abut against the cross-linking portions of the reinforcement member.

9. A method for manufacturing a sound insulation heat dissipation cover, which is the method for manufacturing a sound insulation heat dissipation cover according to any one of claims 1 to 6, wherein: The method for manufacturing the sound insulation heat dissipation cover comprises a forming step (S3), in which a resin is injected into a mold (40) having a rough surface (41b) for forming the heat dissipation contact surface, and then the resin is cured, thereby forming the sound insulation heat dissipation cover. The maximum height roughness of the rough surface is 50 to 300 μm.

10. The method for manufacturing the sound insulation and heat dissipation cover according to claim 9, wherein: In the forming step, the shape of the rough surface of the mold is copied to the heat dissipation contact surface of the sound insulation and heat dissipation cover.

11. The method for manufacturing a sound insulation and heat dissipation cover according to claim 9, wherein: In the molding step, the maximum height roughness of the heat dissipation contact surface of the sound insulation heat dissipation cover is formed to be larger than the maximum height roughness of the rough surface of the mold.

12. The method for manufacturing the sound insulation and heat dissipation cover according to claim 9, wherein: The method for manufacturing the sound-insulating heat-dissipating cover further comprises a roughening step (S1), in which at least a portion of the inner surface of the mold is roughened.

13. The method for manufacturing the sound insulation and heat dissipation cover according to claim 12, wherein: The roughening step roughens at least a portion of the inner surface of the mold by sandblasting.

14. The method for manufacturing the sound insulation and heat dissipation cover according to claim 12, wherein: The mold is made of metal or resin. The roughening step roughens at least a portion of the inner surface of the mold by texturing.

15. The method for manufacturing the sound insulation and heat dissipation cover according to claim 9, wherein: In the molding step, a foaming step of foaming the resin is performed.

16. The method for manufacturing the sound insulation and heat dissipation cover according to claim 9, wherein: The resin molded in the molding step contains a thermally conductive material.

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