JP7563554B2 - Electronic component housing - Google Patents

Description

The present invention relates to an electronic component housing.

In recent years, electric vehicles, hybrid vehicles, fuel cell vehicles, and other electric vehicles that incorporate electric motors into their drive units have been developed and put into practical use as environmentally friendly vehicles. In these electric vehicles, electronic components such as the drive power supply unit, motor, control board, power board, and inverter are housed individually or in groups within a housing.

In the electric vehicle, it is required to insulate the sound generated by the electronic components in order to improve the comfort inside the vehicle. Conventionally, a housing having a thick metal plate has been used based on the mass law, but this causes a problem of large mass. Therefore, for example, Patent Document 1 discloses a configuration in which a slit is provided in a side wall of the housing and a sound-insulating member is attached in the slit.
Patent Document 2 discloses a structure of a sound-absorbing material that absorbs sound waves.

Patent No. 6077928 JP 2018-146746 A

For example, in order to absorb sound using the sound absorbing material disclosed in Patent Document 2, in principle, it is necessary to use a relatively thick sound absorbing material. Therefore, when using this sound absorbing material in the slit described in Patent Document 1, in order to obtain a sound insulation effect, it is necessary to make the housing thick to a certain extent. However, since the space inside the vehicle is limited, it may be difficult to design the slit to be large. In addition, in order to absorb sound, the sound absorbing material such as that in Patent Document 2 needs to be provided so as to cover the sound source as closely as possible, which creates a problem of using a large amount of sound absorbing material.
Furthermore, when the sound-insulating material is in sheet form as in Patent Document 2, if the sound-insulating sheet material is attached to the entire surface facing the electronic component, depending on the configuration of the sound-insulating sheet material, the ends (the intersections of the facing surface with the adjacent surfaces) may lift up, which may result in poor attachment of the sound-insulating sheet material.

The present invention has been made in consideration of the above points, and aims to provide an electronic component housing that uses a small amount of sound-proofing material without increasing the thickness of the electronic component housing, and ensures the sound-proofing effect of the sound-proofing sheet member without causing poor attachment of the sound-proofing sheet member.

As a result of intensive research into solving the above problems, the inventors discovered that the above problems could be solved by providing a sound-proofing sheet member having a sheet-like base in contact with a surface portion having a surface facing an electronic component, and a plurality of protrusions provided on the base, thereby completing the present invention.

That is, the present invention provides various specific embodiments as shown below.
[1] An electronic component housing for housing an electronic component, the housing having a plurality of face portions each having an opposing surface facing an electronic component, the plurality of face portions being connected to each other via an intersection portion, the face portions being provided with a resonant sheet member on at least one of an inner side of the opposing surface facing the electronic component and a back side of the opposing surface not facing the electronic component, the resonant sheet member having a sheet-shaped sheet surface in contact with the face portions and at least one convex portion provided on the sheet surface, the resonant sheet member being provided on at least one of the face portions spaced apart from the intersection portion.
[2] The electronic component housing according to [1], wherein the face portion has a recess formed on a surface thereof, and the resonating sheet member is provided in the recess.
[3] The electronic component housing according to [2], wherein a depth of the recess is equal to or greater than a maximum thickness of the resonator sheet member.
[4] The electronic component housing according to [2] or [3], wherein the housing has a side wall portion surrounding the periphery of the opening, and the recess opens into an end face of the side wall portion facing the opening.
[5] The electronic component housing according to any one of [1] to [4], wherein the housing has a first member having an internal storage space and opening, and a lid member that closes the storage space when joined to the first member, and the opposing surface is at least one surface of the first member and the lid member that faces the storage space.
[6] In the electronic component housing described in any one of [1] to [4], the housing has a first member that is open and has a first storage space therein, and a second member that is open and has a second storage space therein and that closes the first storage space and the second storage space when joined to the first member, and the opposing surfaces are at least one surface of the first member facing the first storage space and at least one surface of the second member facing the second storage space.
[7] The electronic component housing according to any one of [1] to [6], wherein the electronic component includes any one of a driving power supply device, an inverter, a motor, a junction box, a converter, and a secondary battery.

A sound-proofing sheet with multiple protrusions provides sound insulation by suppressing the vibration of the housing caused by a noise source through the resonance of the protrusions. Therefore, unlike conventional sound-absorbing materials, it is effective to place the sheet in the center of the housing's surfaces (apart from the intersections between the surfaces) where vibrations are greatest. Therefore, sufficient sound-proofing effects can be obtained even without placing the sound-proofing sheet near the intersections between the surfaces. In addition, by placing the sound-proofing sheet away from the intersections between the surfaces, the amount of sound-proofing sheet used can be reduced, and the sound-proofing sheet can also be prevented from floating up, which can occur when the sound-proofing sheet is placed at the intersections.

The present invention can provide an electronic component housing that can reduce the amount of resonance material used while ensuring the resonance effect.

FIG. 1 is a diagram showing an embodiment of the present invention, and is a schematic front view of a drive system SYS including an electronic component housing. 2 is a plan view of the housing 21 according to the first embodiment as viewed from the +Z side. FIG. 2 is a cross-sectional view parallel to the XZ plane at the center of the housing 21 in the Y direction. 2 is a cross-sectional view parallel to the YZ plane at the center of the housing 21 in the X direction. FIG. 2 is a partial perspective view showing sound-insulating sheet members 101 to 103. 6 is a cross-sectional view taken along the line II-II in FIG. 5 . 1 is a plan view of the housing 11 as viewed from the +Z side. 2 is a cross-sectional view parallel to the XZ plane at the center of the housing 11 in the Y direction. 2 is a cross-sectional view parallel to the YZ plane at the center of the housing 21 in the X direction. 11 is a cross-sectional view parallel to the XZ plane at the center in the Y direction of the housing 21 according to the second embodiment. FIG. 11 is a cross-sectional view parallel to the YZ plane at the center in the X direction of a housing 21 according to a second embodiment. FIG. FIG. 11 is a plan view of a housing 21 according to a third embodiment, as viewed from the +Z side. 13 is a front view of the housing 21 according to the third embodiment, as viewed from the -Y side. FIG. 11 is a plan view of a housing 11 according to a third embodiment, viewed from the +Z side. FIG. 11 is a plan view of the housing 11 according to the third embodiment, as viewed from the -Y side. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an electronic component housing according to the present invention will be described with reference to FIGS.
The following embodiment shows one aspect of the present invention, does not limit the present invention, and can be modified as desired within the scope of the technical idea of the present invention. In addition, in the following drawings, the scale and number of each structure are different from the actual structure in order to make each configuration easier to understand.

Figure 1 is a schematic front view of a drive system SYS equipped with an electronic component housing according to this embodiment.

The drive system SYS includes a drive power supply unit 1, an inverter unit 2, and a motor unit 3. The drive power supply unit 1, the inverter unit 2, and the motor unit 3 are stacked in order from the top. The drive power supply unit 1 and the inverter unit 2 are fixed with fixing screws (not shown). The inverter unit 2 and the motor unit 3 are fixed with fixing screws (not shown). Therefore, the drive power supply unit 1, the inverter unit 2, and the motor unit 3 are fixed together.

As described below, the drive power supply unit 1, the inverter unit 2, and the motor unit 3 each have a generally rectangular parallelepiped shape when viewed from above. The drive power supply unit 1, the inverter unit 2, and the motor unit 3 are stacked with their longitudinal directions (left-right direction in FIG. 1) aligned.

In the following explanation, the direction in which the drive power supply unit 1, inverter unit 2, and motor unit 3 are stacked and their thickness directions (the vertical direction in FIG. 1) are referred to as the Z direction, the longitudinal direction of each unit 1, 2, and 3 is referred to as the X direction, and the direction perpendicular to the Z direction and the X direction is referred to as the Y direction.

The drive system SYS is installed in vehicles that use a motor as a power source, such as hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHVs), and electric vehicles (EVs), and is used as the power source for these vehicles.

The drive power supply unit 1 includes a drive power supply device 10 and a housing (electronic component housing) 11 that houses the drive power supply device 10 in a storage space 12. Details of the housing 11 will be described later.

The drive power supply device 10 includes, as electronic components, a charger (power source) for charging an AC current into a high-voltage battery, a secondary battery as a high-voltage storage device, a DC/DC converter that converts high voltage to low voltage, and a junction box that distributes high voltage and acts as a breaker that cuts it off in the event of an abnormality.

The inverter unit 2 includes an inverter 20 and a housing (electronic component housing) 21 that houses the inverter 20 in a storage space 22. Details of the housing 21 will be described later.

The inverter 20 converts the DC current supplied from the drive power supply device 10 into AC current and supplies it to the motor unit 3. The inverter 20 includes, as electronic components, a control board that includes a switching circuit and outputs a control signal, a power board that amplifies the AC signal to generate a force that drives the motor, a capacitor, etc.

The motor unit 3 includes a motor 30 and a housing (electronic component housing) 31 that houses the motor 30 in a storage space 32. Details of the housing 31 will be described later.

The motor 30 is driven by an AC current supplied from an inverter unit. The motor 30 includes a motor body and a reducer as electronic components.

[First embodiment of the housing]
Of the housings 11, 21, and 31 (drive power supply unit 1, inverter unit 2, and motor unit 3) according to the first embodiment, the housings 21 and 31 will first be described with reference to Figures 2 to 4. Note that although the housings 21 and 31 are different in size, they have the same configuration, so for the housing 31, a reference numeral with an suffix (A) added to the reference numeral used to describe the housing 21 is shown, and a description thereof will be omitted.

Figure 2 is a plan view of the housing 21 as viewed from the +Z side. Figure 3 is a cross-sectional view parallel to the XZ plane at the center of the housing 21 in the Y direction. Figure 4 is a cross-sectional view parallel to the YZ plane at the center of the housing 21 in the X direction.

As shown in Figs. 2 to 4, the housing 21 has a rectangular parallelepiped shape in a plan view. The housing 21 has a first member 23 and a second member (lid member) 24. The first member 23 and the second member 24 are formed of a metal material. It is preferable that the first member 23 and the second member 24 are formed of a light metal such as an aluminum alloy or a magnesium alloy.

The first member 23 has a storage space 22 inside and opens to the +Z side. The first member 23 has a bottom wall portion 25, side wall portions 26 and 27, and a flange portion 28. As shown in FIG. 3, the bottom wall portion 25 is disposed parallel to the XY plane. The bottom wall portion 25 has an opposing surface 69 that faces the inverter 20. The side wall portion 26 extends to the +Z side from both ends of the bottom wall portion 25 in the X direction. The side wall portions 26 face each other in the X direction.

The +Z end of each side wall portion 26 is provided with a flange portion 28 that protrudes outward in the X direction. The first member 23 and the second member 24 are fixed in the Z direction by fastening a plurality of fixing screws 29 (six in FIG. 2) to the flange portions 28. As shown in FIG. 4, the side wall portions 27 extend to the +Z side from both ends of the bottom wall portion 25 in the Y direction. The side wall portions 27 face each other in the Y direction. The storage space 22 is a space formed by being surrounded by the bottom wall portion 25 and the side wall portions 26, 27.

The second member 24 is a plate-like member arranged parallel to the XY plane. The second member 24 is joined to the +Z end faces of the side walls 26 and 27, and functions as a lid member that closes the opening of the storage space 22.

As shown in FIG. 3, the side wall portion 26 as a surface portion has a planar facing surface (inner surface) 66 facing the inverter 20. As shown in FIG. 4, the side wall portion 27 as a surface portion has a planar facing surface 67 on the inside facing the inverter 20. The second member 24 as a surface portion has a facing surface 68 on the inside facing the inverter 20.

A sound-proof sheet member 101 is provided on each of the opposing surfaces 66. As shown in Figs. 3 and 4, the area of the sound-proof sheet member 101 is smaller than the area of the opposing surface 66. More specifically, the sound-proof sheet member 101 is provided on the opposing surface 66 away from the linear intersections with the opposing surface 67, the linear intersections with the opposing surface 68, and the linear intersections with the opposing surface 69, and is provided with an area smaller than the area of the opposing surface 66. The sound-proof sheet member 101 is provided in an area including the central portion of the opposing surface 66 where the vibration (amplitude) is large.

A sound-proof sheet member 102 is provided on each of the opposing surfaces 67. As shown in Figs. 3 and 4, the area of the sound-proof sheet member 102 is smaller than the area of the opposing surface 67. More specifically, the sound-proof sheet member 102 is provided on the opposing surface 67 away from the linear intersections with the opposing surface 66, the linear intersections with the opposing surface 68, and the linear intersections with the opposing surface 69, and is provided with an area smaller than the area of the opposing surface 67. The sound-proof sheet member 102 is provided in an area including the central portion of the opposing surface 67 where the vibration (amplitude) is large.

A sound-insulating sheet member 103 is provided on the opposing surface 68. The area of the sound-insulating sheet member 103 is smaller than the area of the opposing surface 68. More specifically, the sound-insulating sheet member 103 is provided on the opposing surface 68, as shown in FIG. 2, away from the linear intersection with the opposing surface 66 and the linear intersection with the opposing surface 67, and is provided with an area smaller than the area of the opposing surface 68. The sound-insulating sheet member 103 is provided in an area including the central portion of the opposing surface 68 where the vibration (amplitude) is large.

Figure 5 is a partial perspective view showing sound insulation sheet members 101 to 103. Figure 6 is a cross-sectional view taken along the line II-II in Figure 5. In the following description, sound insulation sheet members 101 to 103 will be collectively referred to as sound insulation sheet member 100.

5, the sound-proof sheet member 100 includes a sheet 111 having rubber elasticity and a base 51 supporting a sheet surface 111b of the sheet 111. The sheet 111 includes a plurality of resonating portions (convex portions) 121 provided in contact with the sheet surface 111a.
Here, the base 51 may be a surface of the housing (21, 31), or a separate base 51 may be provided between the surface and the sheet surface 111b.

[Sheet]
The sheet 111 is a sheet having rubber elasticity. Although not particularly limited, it may have rubber elasticity due to molecular motion of resin (organic polymer). This sheet 111 can also function as an oscillator (resonator) that vibrates at a certain frequency when sound waves from a noise source or vibrations from a vibration source are incident. That is, the sheet 111 acts as a resonator when sound waves or solid vibrations are transmitted and the housing vibrates. The material constituting the sheet 111 preferably contains at least one selected from the group consisting of a heat- or light-curing elastomer and a thermoplastic elastomer. As the thickness increases, it may become more difficult for the irradiated light to reach the center, so it is more preferable to use a thermosetting elastomer or a thermoplastic elastomer. Specific examples include vulcanized rubber such as chemically crosslinked natural rubber or synthetic rubber, thermosetting elastomers such as thermosetting resin-based elastomers such as urethane rubber, silicone rubber, fluororubber, and acrylic rubber, thermoplastic elastomers such as olefin-based thermoplastic elastomers, styrene-based thermoplastic elastomers, PVC-based thermoplastic elastomers, urethane-based thermoplastic elastomers, ester-based thermoplastic elastomers, amide-based thermoplastic elastomers, silicone rubber-based thermoplastic elastomers, and acrylic-based thermoplastic elastomers, and photocurable elastomers such as acrylic-based photocurable elastomers, silicone-based photocurable elastomers, and epoxy-based photocurable elastomers. More specific examples include natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, polyisobutylene rubber, ethylene-propylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, fluororubber, epichlorohydrin rubber, polyester rubber, urethane rubber, silicone rubber, and modified products thereof, but are not particularly limited thereto. These may be used alone or in combination of two or more. Among these, natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, polyisobutylene rubber, ethylene propylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, fluororubber, epichlorohydrin rubber, polyester rubber, urethane rubber, silicone rubber, and modified products thereof are preferred, and silicone rubber, acrylic rubber, and modified products thereof are more preferred from the viewpoint of excellent heat resistance and cold resistance.
As long as the sheet 111 is a sheet exhibiting so-called rubber elasticity, it may contain various additives such as a flame retardant, an antioxidant, and a plasticizer. The flame retardant is an additive that is mixed to make a flammable material less flammable or to prevent it from igniting. Specific examples of the flame retardant include bromine compounds such as pentabromodiphenyl ether, octabromodiphenyl ether, decabromodiphenyl ether, tetrabromobisphenol A, hexabromocyclododecane, and hexabromobenzene, phosphorus compounds such as triphenyl phosphate, chlorine compounds such as chlorinated paraffin, antimony compounds such as antimony trioxide, metal hydroxides such as aluminum hydroxide, nitrogen compounds such as melamine cyanurate, and boron compounds such as sodium borate, but are not limited to these. The antioxidant is an additive that is mixed to prevent oxidative deterioration. Specific examples of the flame retardant include phenol-based antioxidants, sulfur-based antioxidants, and phosphorus-based antioxidants, but are not limited to these. The plasticizer is an additive that is mixed to improve flexibility and weather resistance. Specific examples thereof include, but are not limited to, phthalates, adipates, trimellitates, polyesters, phosphates, citrates, sebacates, azelates, maleates, silicone oils, mineral oils, vegetable oils, and modified products thereof, etc. These may be used alone or in combination of two or more.
In this embodiment, the sheet 111 is formed in a square or rectangular shape in a plan view, but the shape is not particularly limited thereto. Any shape in a plan view can be adopted, such as a triangular shape, a rectangular shape, a trapezoidal shape, a diamond shape, a polygonal shape such as a pentagonal shape or a hexagonal shape, a circular shape, an elliptical shape, or an irregular shape not classified into the above.
The thickness of the sheet 111 is not particularly limited. Since the frequency band (acoustic band gap width or frequency position) exhibiting high sound insulation performance can be controlled by the thickness of the sheet 111, the thickness of the sheet 111 can be appropriately set so that the acoustic band gap coincides with the desired sound insulation frequency range. If the thickness of the sheet 111 is thick, the acoustic band gap width tends to be narrower and shift toward the lower frequency side. Also, if the thickness of the sheet 111 is thin, the acoustic band gap width tends to be wider and shift toward the higher frequency side. From the viewpoints of sound insulation performance, mechanical strength, flexibility, handling, etc., the thickness of the sheet 111 is preferably 50 μm or more, more preferably 100 μm or more, and even more preferably 200 μm or more. Also, the thickness of the sheet 111 is preferably 10 mm or less, more preferably 1 mm or less, and even more preferably 500 μm or less.
Here, from the viewpoints of sound insulation performance, mechanical strength, flexibility, handling properties, productivity, etc., the sheet 111 preferably has a Young's modulus of 0.01 MPa or more, more preferably 0.1 MPa or more, and preferably has a Young's modulus of 100 MPa or less, more preferably 10 MPa or less. Here, the Young's modulus in this specification means the ratio of the force (stress) acting per unit cross-sectional area of the sample when an external force is applied in one axial direction to the deformation rate (strain), and means the value of the storage vertical elastic modulus at 25°C and 10 Hz measured by the forced vibration non-resonance method of JIS K 6394:2007 "Vulcanized rubber and thermoplastic rubber - Determination of dynamic properties -".
Moreover, from the viewpoint of reducing the temperature dependency of sound insulation at low temperatures, the sheet 111 preferably has a glass transition temperature of 0° C. or lower. The lower the glass transition temperature of the sheet 111, the higher the cold resistance is, and the smaller the temperature dependency of the elastic modulus around 0° C. tends to make the sound insulation performance less dependent on the environmental temperature. The glass transition temperature is more preferably −10° C. or lower, even more preferably −20° C. or lower, and particularly preferably −30° C. or lower. In this specification, the glass transition temperature of the sheet 111 means the peak temperature of the loss tangent in the dynamic viscoelasticity measurement at a frequency of 10 Hz described above, particularly in the temperature dependency measurement.

[Resonator]
The resonating part 121 functions as an oscillator (resonator) that vibrates at a certain frequency when sound waves are incident from a noise source. The resonating part 121 of this embodiment is configured as a composite structure including a base part 122 and a weight part 123 that is supported by the base part 122 and has a mass larger than that of the base part 122. By forming the resonating part 121 into such a composite structure, the resonating part 121 effectively functions as a resonator having a resonance frequency determined by the mass of the weight part 123 that acts as a weight and the spring constant of the base part 122 that acts as a spring.
The arrangement, number of installations, size, etc. of the resonating parts 121 can be appropriately set according to the desired performance, and are not particularly limited. The resonating parts 121 are provided in contact with at least one sheet surface of the sheet. For example, in this embodiment, the multiple resonating parts 121 are arranged at equal intervals in a lattice shape, but the arrangement of the resonating parts 121 is not particularly limited to this. For example, the multiple resonating parts 121 may be arranged in a staggered shape or randomly. Since the sound insulation mechanism using this sheet does not use Bragg scattering like so-called phononic crystals, the intervals of the resonating parts 121 do not necessarily have to be arranged regularly and periodically.
The number of resonating parts 121 installed per unit area is not particularly limited as long as the resonating parts 121 can be arranged so as not to interfere with each other due to contact or the like. The maximum number of resonating parts 121 per unit area varies depending on the shape of the resonating parts 121, etc., but for example, when the resonating parts 121 are cylindrical, the height direction of the cylinder is installed parallel to the sheet normal direction, and the cross-sectional diameter of the cylinder is 1 cm, it is preferable that the number of resonating parts 121 is 100 or less per ¹⁰ cm2. In addition, the minimum number of resonating parts 121 per unit area is preferably 2 or more per 10 ^cm2 , more preferably 10 or more, and even more preferably 50 or more, when the resonating parts 121 are cylindrical, the height direction of the cylinder is installed parallel to the sheet normal direction, and the cross-sectional diameter is 1 cm. When the number of resonating parts 121 installed is equal to or more than the above-mentioned preferable lower limit, higher sound insulation performance tends to be obtained. In addition, when the number is equal to or less than the above-mentioned preferable upper limit, it is easy to reduce the weight of the entire seat.
The maximum height H1 of the resonating portion 121 in the normal direction of the sheet 111 can be appropriately set according to the desired performance, and is not particularly limited. From the viewpoint of ease of molding and improvement of productivity, the maximum height H1 is preferably 50 μm or more and 100 mm or less, more preferably 100 μm or more and 50 mm or less, and even more preferably 1 mm or more and 20 mm or less. By setting the maximum height H1 within the above preferred numerical range, the sheet 111 provided with the resonating portion 121 (i.e., the sound insulation sheet member 100) can be easily wound up and stacked, so that so-called roll-to-roll manufacturing and storage can be performed, and productivity and economy tend to be improved.

[base]
In this embodiment, a plurality of bases 122 each having a substantially cylindrical outer shape are provided on the sheet surface 111a of the sheet 111 in contact with each other, and each of the weights 123 each having a substantially cylindrical outer shape is embedded inside the bases 122. The outer shape of the base 122 is not particularly limited, and any shape can be adopted, such as a triangular prism, a rectangular prism, a trapezoidal prism, a polygonal prism such as a pentagonal prism or a hexagonal prism, a cylindrical shape, an elliptical prism, a truncated pyramid shape, a truncated cone shape, a pyramid shape, a cone shape, a hollow cylinder shape, a branched shape, or an indefinite shape not classified as above. The base 122 can also be formed into a columnar shape having a different cross-sectional area and/or cross-sectional shape depending on the height position.
The material of the base 122 is not particularly limited as long as it satisfies the above required characteristics. For example, a polymer material may be used, and at least one selected from the group consisting of a heat- or light-curable elastomer, a thermoplastic elastomer, a heat- or light-curable resin, and a thermoplastic resin may be used. Examples of the heat- or light-curable elastomer and the thermoplastic elastomer include those exemplified in the sheet. Examples of the heat- or light-curable resin include an acrylic thermosetting resin, a urethane thermosetting resin, a silicone thermosetting resin, and an epoxy thermosetting resin. Examples of the thermoplastic resin include a polyolefin thermoplastic resin, a polyester thermoplastic resin, an acrylic thermoplastic resin, a urethane thermoplastic resin, and a polycarbonate thermoplastic resin. Specific examples include vulcanized rubber such as chemically crosslinked natural rubber or synthetic rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, polyisobutylene rubber, ethylene propylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, fluororubber, epichlorohydrin rubber, polyester rubber, urethane rubber, silicone rubber, and modified versions thereof; and polymers such as polyacrylonitrile, polyethylene terephthalate, polybutylene terephthalate, polyvinyl chloride, polychlorotrifluoroethylene, polyethylene, polypropylene, polynorbornene, polyether ether ketone, polyphenylene sulfide, polyarylate, polycarbonate, polystyrene, epoxy resin, and oxazine resin, but are not limited to these. These may be used alone or in combination of two or more. The base 122 may be a porous body containing pores (gas such as air) in these polymer materials. Furthermore, the base 122 may contain a liquid material such as mineral oil, vegetable oil, and silicone oil. When the base 122 contains a liquid material, it is preferable to encapsulate the liquid material in a polymer material in order to prevent the liquid material from leaking out.
Among these, the material of the base 122 is preferably the same as that of the above-mentioned sheet 111, and elastomers are particularly preferred. If the sheet 111 and the base 122 contain the same elastomers, the sheet 111 and the base 122 can be easily molded together, and productivity can be dramatically improved. In other words, one particularly preferred embodiment is that the sheet 111 and the resonator 121 (base 122) are an integrally molded product that both contain at least one type selected from the group consisting of a heat- or light-curable elastomer and a thermoplastic elastomer. Specific examples of elastomers include vulcanized rubber such as chemically crosslinked natural rubber or synthetic rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, polyisobutylene rubber, ethylene propylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, fluororubber, epichlorohydrin rubber, polyester rubber, urethane rubber, silicone rubber and modified products thereof, polyacrylonitrile, polyethylene terephthalate, polybutylene terephthalate, polyvinyl chloride, polychlorotrifluoroethylene, polyethylene, polypropylene, polynorbornene, polyether ether ketone, polyphenylene sulfide, polyarylate, polycarbonate, polystyrene, epoxy resin, oxazine resin, and the like, but are not particularly limited thereto. Of these, natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, polyisobutylene rubber, ethylene propylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, fluororubber, epichlorohydrin rubber, polyester rubber, urethane rubber, silicone rubber, and modified products thereof are preferred, and from the viewpoint of excellent heat resistance and cold resistance, silicone rubber, acrylic rubber, and modified products thereof are more preferred.
The base 122 may be a two-color molded body or a multi-color molded body made of two or more kinds of polymer materials. In this case, by using the same elastomer as the sheet 111 for the side of the base 122 that contacts the sheet 111, the sheet 111 and the base 122 can be integrally molded.
In addition, when the resonating portion 121 (base 122) having a circular cross section is provided as in this embodiment, in a cross section parallel to the sheet surface 111a of the sheet 111 at the height position of the resonating portion 121 (base 122) where the sum of the cross-sectional areas of the multiple resonating portions 121 (bases 122) is maximum, the diameter of the circle with the largest diameter among the circles (circular cross sections) included in the cross section is preferably 100 mm or less, more preferably 50 mm or less, and even more preferably 20 mm or less. In addition, the diameter of the circle with the smallest diameter is preferably 50 μm or more, more preferably 100 μm or more, and even more preferably 1 mm or more. By setting it within the above preferred numerical range, it is possible to secure a predetermined number or more of the resonating portion 121 (base 122) to be installed on the sheet surface 111a of the sheet 111, and further good sound insulation performance can be obtained, and the ease of molding and productivity also tend to be further improved.

[Weight section]
The weight portion 123 is not particularly limited as long as it has a mass larger than that of the base portion 122 described above. In this embodiment, the weight portion 123 is formed in a substantially cylindrical shape with a maximum diameter smaller than that of the base portion 122, and is embedded in the base portion 122 at the tip side of the resonating portion 121. Since the weight portion 123 acting as a weight of the resonator is supported by the base portion 122 that determines the spring constant, the resonant frequency of the resonating portion 121 can be easily controlled by, for example, adjusting the spring constant by changing the shape or material (elastic modulus, mass) of the base portion 122 or by changing the mass of the weight portion 123. In general, when the elastic modulus of the base portion 122 is smaller, the acoustic band gap tends to shift to the lower frequency side. Also, when the mass of the weight portion 123 is larger, the acoustic band gap tends to shift to the lower frequency side.
The material constituting the weight portion 123 may be appropriately selected in consideration of mass, cost, etc., and the type is not particularly limited. From the viewpoint of miniaturization of the sound insulation sheet member 100 and improvement of sound insulation performance, etc., the material constituting the weight portion 123 is preferably a material with a high specific gravity. Specifically, metals or alloys such as aluminum, stainless steel, iron, tungsten, gold, silver, copper, lead, zinc, brass, etc.; inorganic glass such as soda glass, quartz glass, lead glass, etc.; composites containing powder of these metals or alloys or these inorganic glasses, etc., in the polymer material of the base portion 122 described above; etc., but are not particularly limited thereto. The material, mass, and specific gravity of the weight portion 123 may be determined so that the resonance frequency of the sound insulation sheet member 100 coincides with the desired sound insulation frequency range. Among these, at least one selected from the group consisting of metals, alloys, and inorganic glasses is preferable from the viewpoint of low cost and high specific gravity. The specific gravity means the ratio of the mass of a material to the mass of the same volume of pure water at 4°C under a pressure of 1013.25 hPa, and in this specification, the value measured in accordance with JIS K 0061 "Method of measuring density and specific gravity of chemical products" is used.
In this embodiment, the weight 123 is embedded in the base 122 at the tip side of the resonating part 121, but the installation position is not particularly limited thereto. Although it varies depending on the shape, mass, elastic modulus, etc. of the base 122 and the weight 123, it is preferable to arrange the base 122 and the weight 123 so that the center of gravity (center of mass) of the resonating part 121 is located at least on the tip side from the center in the height direction of the resonating part 121 in terms of reducing the thickness and weight of the sound insulation sheet member or improving the sound insulation performance. Typically, the weight 123 may be offset to the tip side from the center in the height direction of the resonating part 121. Note that the weight 123 may be completely embedded in the base 122, or only a part of it may be embedded, or it may be provided on the base 122 without being embedded in the base 122. Furthermore, in the case where the base 122 has a branched structure, from the viewpoint of reducing the weight of the sound insulation sheet member or improving the sound insulation performance, when a weight is provided on a branch provided from a branch point, it is preferable to arrange the weight 123 so as to be located on the tip side of the branch rather than the center. The shape of the weight 123 may be, other than a substantially cylindrical shape, a sphere, a hemisphere, a cube, a rectangular parallelepiped, an abacus sphere, or the like.
A plurality of resonating parts 121 are provided on the sheet surface 111a of the sheet 111, but the material constituting the resonating parts 121, the arrangement, shape, size, installation direction of the resonating parts 121, etc. do not necessarily have to be the same for all of the plurality of resonating parts 121. By providing a plurality of types of resonating parts 121 in which at least one of these types is different, it is possible to expand the frequency range in which high sound insulation performance is exhibited.

[Adhesion]
The sheet 111 is placed in contact with the surface of the housing, but the method for placing the sheet 111 is not particularly limited. That is, the sheet 111 may be attached or adhered to the surface of the housing by a bonding agent, self-adhesive without a bonding agent, or the sheet may be fused to the surface of the housing.

In the above-mentioned sound-proof sheet member 100, for example, when sound waves are incident from a noise source on the base 51 side or vibrations are incident from a vibration source, resonance occurs in at least one of the sheet 111 and the resonating portion 121. At this time, theoretically, a frequency range can exist in which the direction of the force acting on the base 51 is opposite to the direction of the acceleration occurring in at least one of the sheet 111 and the resonating portion 121, and a complete acoustic band gap occurs in which vibrations of a specific frequency are almost completely eliminated by canceling out part or all of the vibrations of the specific frequency. Therefore, in the vicinity of the resonant frequency of at least one of the sheet 111 and the resonating portion 121, part or all of the vibrations come to rest, and as a result, high sound-proofing performance that exceeds the mass law is obtained. A sound-proofing member that utilizes such a principle is called an acoustic metamaterial. Note that the sheet 111 may have cuts or punched holes at any location from the viewpoint of improving the elasticity and reducing the weight, as long as the characteristics of the acoustic metamaterial are not lost.

Figure 7 is a plan view of the housing 11 as viewed from the +Z side. Figure 8 is a cross-sectional view parallel to the XZ plane at the center of the housing 11 in the Y direction. Figure 9 is a cross-sectional view parallel to the YZ plane at the center of the housing 21 in the X direction.

As shown in Figs. 7 to 9, the housing 11 has a rectangular parallelepiped shape in a plan view. The housing 11 has a first member 13 and a second member 14. The first member 13 and the second member 14 are formed from a metal material. It is preferable that the first member 13 and the second member 14 are formed from a light metal such as an aluminum alloy or a magnesium alloy.

The first member 13 has a storage space 12A inside and opens to the +Z side. The first member 13 has a bottom wall portion 15A, side wall portions 16A and 17A, and a flange portion 18A. The bottom wall portion 15A is arranged parallel to the XY plane. The bottom wall portion 15A has an opposing surface 79A that faces the drive power supply device 10. The side wall portion 16A extends to the +Z side from both ends of the bottom wall portion 15A in the X direction. The side wall portions 16A face each other in the X direction.

The +Z end of each side wall portion 16A is provided with a flange portion 18A that protrudes outward in the X direction. The first member 13 and the second member 14 are fixed in the Z direction by fastening a plurality of fixing screws 19 (six in FIG. 7) to the flange portion 18A. As shown in FIG. 9, the side wall portion 17A extends to the +Z side from both ends of the bottom wall portion 15A in the Y direction. The side wall portions 17A face each other in the Y direction. The storage space 12A is a space formed by being surrounded by the bottom wall portion 15A and the side wall portions 16A and 17A.

The second member 14 has a storage space 12B inside and opens to the -Z side. The storage space 12 in the housing 11 is formed by storage space 12A and storage space 12B that communicate with each other. The second member 14 has a bottom wall portion 15B, side wall portions 16B, 17B, and a flange portion 18B. The bottom wall portion 15B is arranged parallel to the XY plane. The bottom wall portion 15B has an opposing surface 79B that faces the drive power supply device 10. The side wall portion 16B extends to the -Z side from both ends of the bottom wall portion 15B in the X direction. The side wall portions 16B face each other in the X direction. It is also possible to use a plate-shaped member such as the second member 24 as the second member 14.

The -Z end of each side wall portion 16B is provided with a flange portion 18B that protrudes outward in the X direction. As shown in FIG. 9, the side wall portion 17B extends to the -Z side from both ends of the bottom wall portion 15B in the Y direction. The side wall portions 17B face each other in the Y direction. The storage space 12B is a space that is formed by being surrounded by the bottom wall portion 15B and the side wall portions 16B and 17B.

As shown in FIG. 8, the side walls 16A and 16B as surfaces have planar opposing surfaces (inner surfaces) 76A and 76B that face the drive power supply device 10. As shown in FIG. 9, the side walls 17A and 17B as surfaces have planar opposing surfaces 77A and 77B on the inner side that face the drive power supply device 10.

Sound-proof sheet members 104A and 104B are provided on the opposing surfaces 76A and 76B, respectively. As shown in Figs. 8 and 9, the areas of the sound-proof sheet members 104A and 104B are smaller than the areas of the opposing surfaces 76A and 76B, respectively. More specifically, the sound-proof sheet member 104A is provided on the opposing surface 76A, spaced apart from the linear intersection with the opposing surface 77A, the linear intersection with the opposing surface 79A, and the linear intersection with the joint surface with the second member 14, so that the area is smaller than the area of the opposing surface 76A. The sound-proof sheet member 104A is provided in an area including the central portion of the opposing surface 76A where the vibration (amplitude) is large.

The sound-proof sheet member 104B is provided on the facing surface 76B, spaced apart from the linear intersections with the facing surface 77B, the linear intersections with the facing surface 79B, and the linear intersections with the joint surface with the first member 13, and is therefore provided with an area smaller than the area of the facing surface 76B. The sound-proof sheet member 104B is provided in an area including the central portion of the facing surface 76B where the vibration (amplitude) is large.

Sound-proof sheet members 105A and 105B are provided on the opposing surfaces 77A and 77B, respectively. As shown in Figs. 8 and 9, the areas of the sound-proof sheet members 105A and 105B are smaller than the areas of the opposing surfaces 77A and 77B. More specifically, the sound-proof sheet member 105A is provided on the opposing surface 77A away from the linear intersection with the opposing surface 76A, the linear intersection with the opposing surface 79A, and the linear intersection with the joint surface with the second member 14, so that the sound-proof sheet member 105A is provided with an area smaller than that of the opposing surface 77A. The sound-proof sheet member 105A is provided in an area including the central portion of the opposing surface 77A where the vibration (amplitude) is large.

The sound-proof sheet member 105B is provided on the facing surface 77B, spaced apart from the linear intersection with the facing surface 76B, the linear intersection with the facing surface 79B, and the linear intersection with the joint surface with the first member 13, and is therefore provided with an area smaller than the area of the facing surface 77B. The sound-proof sheet member 105B is provided in an area including the central portion of the facing surface 77B where the vibration (amplitude) is large.

A sound-insulating sheet member 106B is provided on the opposing surface 79B. The area of the sound-insulating sheet member 106B is smaller than the area of the opposing surface 79B. More specifically, as shown in FIG. 7, the sound-insulating sheet member 106B is provided on the opposing surface 79B away from the linear intersection with the opposing surface 76B and the linear intersection with the opposing surface 77B, and is therefore provided with an area smaller than the area of the opposing surface 79B. The sound-insulating sheet member 106B is provided in an area including the central portion of the opposing surface 79B where the vibration (amplitude) is large.

Sound insulation sheet members 104A, 104B, 105A, 105B, and 106B have the same configuration as the sound insulation sheet members 101 to 103 (i.e., sound insulation sheet member 100) described above.

The above-mentioned sound-insulating sheet members 101, 102, 103 and a part or the whole surface of the housing 21 are adhered to each other at the base 51 by an adhesive, a sticky material, or self-adhesive. The sound-insulating sheet members 101A, 102A, 103A and a part or the whole surface of the housing 31 are adhered to each other at the base 51 by an adhesive, a sticky material, or self-adhesive. The sound-insulating sheet members 104A, 104B, 105A, 105B, 106B and a part or the whole surface of the housing 11 are adhered to each other at the base 51 by an adhesive, a sticky material, or self-adhesive.

In the drive system SYS configured as described above, sound waves or vibrations generated from the inverter 20 in the inverter unit 2 enter the sound-insulating sheet member 101 through the side wall portion 26, enter the sound-insulating sheet member 102 through the side wall portion 27, and enter the sound-insulating sheet member 103 through the second member 24. The sound-insulating sheet members 101 to 103 to which the sound waves generated from the inverter 20 enter resonate with at least one of the sheet 111 and the resonating portion 121, making it possible for a frequency range to exist in which the direction of the force acting on the base 51 is opposite to the direction of the acceleration generated in at least one of the sheet 111 and the resonating portion 121, and a part or all of the vibration of a specific frequency is canceled. Therefore, the housing 21 is sound-insulated by setting the resonant frequency of at least one of the sheet 111 and the resonating portion 121 to be near the frequency at which the side wall portions 26, 27 and the second member 24 vibrate in response to the sound waves or vibrations generated by the inverter 20.

Similarly, sound waves or vibrations generated by the motor 30 in the motor unit 3 enter the sound-insulating sheet member 101A through the side wall portion 26A, enter the sound-insulating sheet member 102A through the side wall portion 27A, and enter the sound-insulating sheet member 103A through the second member 24A. The sound-insulating sheet members 101A to 103A, to which the sound waves generated by the motor 30 enter, resonate in at least one of the sheet 111 and the resonating portion 121, making it possible for a frequency range to exist in which the direction of the force acting on the base 51 is opposite to the direction of the acceleration generated in at least one of the sheet 111 and the resonating portion 121, and a part or all of the vibration of a specific frequency is canceled. Therefore, the housing 31 is sound-insulated by setting the resonant frequency of at least one of the sheet 111 and the resonating portion 121 to be near the frequency at which the side wall portions 26A, 27A and the second member 24A vibrate in response to the sound waves or vibrations generated by the motor 30.

Similarly, sound waves or vibrations generated from the drive power supply device 10 in the drive power supply unit 1 enter the sound insulation sheet member 104A through the side wall portion 16A in the first member 13, and enter the sound insulation sheet member 105A through the side wall portion 17A. Sound waves or vibrations generated from the drive power supply device 10 enter the sound insulation sheet member 104B through the side wall portion 16B in the second member 14, enter the sound insulation sheet member 105B through the side wall portion 17B, and enter the sound insulation sheet member 106B through the bottom wall portion 15B. When sound waves or vibrations generated by the drive power supply device 10 enter the sound-proof sheet members 104A-106B, resonance occurs in at least one of the sheet 111 and the resonating portion 121, making it possible for a frequency range to exist in which the direction of the force acting on the base 51 is opposite to the direction of the acceleration generated in at least one of the sheet 111 and the resonating portion 121, and vibrations of a specific frequency are partially or entirely cancelled. Therefore, the housing 11 is soundproofed by setting the resonant frequency of at least one of the sheet 111 and the resonating portion 121 to a frequency near the frequency at which the side walls 16A, 16B, 17A, 17B and the bottom wall 15B vibrate in response to sound waves or vibrations generated by the drive power supply device 10.

In addition, when the above-mentioned sound-proofing sheet members 101-103, 101A-103A, 104A, 104B, 105A, 105B, and 106B are provided across the intersections between the opposing surfaces on which they are provided and the surfaces that intersect with them, the sheet 111 is flexible and therefore conforms to the intersections in the areas where the resonating portion 121 is not provided, but the areas where the resonating portion 121 is provided are thick and have a high bending strength, making it difficult for the sheet 111 to conform to the intersections. In this case, the sheet 111 will float up, making it difficult for vibrations to be transmitted through the side walls and bottom wall, and there is a possibility that sufficient sound-proofing performance will not be achieved.

In contrast, the sound-proofing sheet members 101-103, 101A-103A, 104A, 104B, 105A, 105B, and 106B are all provided on the opposing surfaces at a distance from the intersections between the opposing surfaces and the surfaces that intersect with them, so that even in areas where the resonating portion 121 is provided and bending strength is high, there is no lifting, i.e., no poor attachment occurs, and sufficient sound-proofing effect can be ensured.

In particular, in this embodiment, the sound-proofing sheet member is provided in an area including the central portion where vibration is large on the opposing surfaces of the side wall and bottom wall, thereby providing effective sound insulation. Furthermore, in this embodiment, the sound-proofing sheet member is not provided near the intersection portion where vibration is small on the opposing surfaces, so the amount of sound-proofing sheet member used can be reduced, which contributes to cost reduction.

[Second embodiment of the housing]
Next, a second embodiment of the housing will be described with reference to FIGS.
In the first embodiment, the sound-proof sheet member is directly provided on the opposing surface, but in the second embodiment, a recess is provided on the opposing surface and the sound-proof sheet member is provided in the recess. In these figures, the same elements as those in the first embodiment shown in Figures 1 to 9 are given the same reference numerals and their description will be omitted.

Figure 10 is a cross-sectional view parallel to the XZ plane at the center of the housing 21 in the Y direction. Figure 11 is a cross-sectional view parallel to the YZ plane at the center of the housing 21 in the X direction. In Figures 10 and 11, a configuration in which a recess is provided in the housing 21 is illustrated, but a recess may be provided in the housings 11 and 31.

As shown in FIG. 10, the opposing surface 66 of the side wall portion 26 is provided with a recess 26a. The recess 26a opens to the opening side end surface of the side wall portion 26 (i.e., the joint surface of the second member 24). A sound insulation sheet member 101 is provided in the recess 26a. The depth of the recess 26a is formed to be equal to or greater than the maximum thickness (height H2 in FIG. 6) of the sound insulation sheet member 101. As shown in FIG. 11, the opposing surface 67 of the side wall portion 27 is provided with a recess 27a. The recess 27a opens to the opening side end surface of the side wall portion 27. A sound insulation sheet member 102 is provided in the recess 27a. The depth of the recess 27a is formed to be equal to or greater than the maximum thickness of the sound insulation sheet member 102. The opposing surface 68 of the second member 24 is provided with a recess 24a. The recess 24a is provided with a sound insulation sheet member 103. The depth of the recess 24 a is formed to be equal to or greater than the maximum thickness of the sound-insulating sheet member 103 .
The other configurations are similar to those of the first embodiment.

In the case 21 having the above configuration, the sound insulation sheet members 101 to 103 can be prevented from protruding into the storage space 22, so that the reduction in the storage space 22 can be suppressed. In particular, in the case 21 having the above configuration, the depth of the recesses 26, 27a, and 24a is formed to be equal to or greater than the maximum thickness of the sound insulation sheet members 101 to 103, so that the storage space 22 can be utilized to the maximum extent, and the sound insulation sheet members 101 to 103 can be prevented from coming into contact with each other and peeling off when the inverter 20 is installed in the storage space 22. In addition, in the case 21 having the above configuration, the recesses 26 and 27a open on the opening side end faces of the side walls 26 and 27, so that there is no undercut when the first member 23 is molded using a mold, which makes molding easier and improves productivity.

[Third embodiment of the housing]
Next, a third embodiment of the housing will be described with reference to FIGS.
In these figures, the same elements as those in the first embodiment shown in FIGS. 1 to 9 are designated by the same reference numerals, and the description thereof will be omitted.

In the first embodiment described above, a configuration in which a sound-proof sheet member is provided on the inside of the side wall portion and the first member having an opposing surface is exemplified, but the effect of canceling vibrations in the side wall portion and the first member is also exhibited when the sound-proof sheet member is provided on the outside, behind the opposing surface, not facing the electronic component, so this configuration will be described.

Figure 12 is a plan view of the housing 21 according to the third embodiment as viewed from the +Z side. Figure 13 is a front view of the housing 21 according to the third embodiment as viewed from the -Y side. Figure 14 is a plan view of the housing 11 according to the third embodiment as viewed from the +Z side. Figure 15 is a front view of the housing 11 according to the third embodiment as viewed from the -Y side. In Figures 12 to 15, a configuration in which a sound-insulating sheet member is provided on the outside of the housings 11 and 21 is illustrated, but a sound-insulating sheet member may also be provided on the outside of the housing 31.

As shown in FIG. 12, the second member 24 has a sound-proofing sheet member 106 on the facing surface and on the outer surface 68a on the back side on the outside in the Z direction. The sound-proofing sheet member 106 and a part or the entire surface of the housing 21 are adhered to each other at the base 51 by adhesive, adhesive material, or self-adhesiveness. The area of the sound-proofing sheet member 106 is smaller than the area of the facing surface 68 shown in FIG. 3. The sound-proofing sheet member 106 is provided on the outer surface 68a, spaced apart from each edge of the outer surface 68a. Therefore, as described above, the sound-proofing sheet member 106 does not lift up even in areas where the resonating portion 121 is provided and where bending strength is high, i.e., no poor attachment occurs, and sufficient sound-proofing effect can be ensured.

As shown in FIG. 13, the first member 23 has a sound-proof sheet member 107 provided on the outer surface 67a of the side wall portion 27 on the outer side in the Y direction. The sound-proof sheet member 107 and a part or the entire surface of the housing 21 are adhered to each other at the base 51 by an adhesive, a sticky material, or self-adhesiveness. The area of the sound-proof sheet member 107 is smaller than the area of the opposing surface 67 shown in FIG. 3. The sound-proof sheet member 107 is provided on the outer surface 67a, spaced apart from each edge of the outer surface 67a. Therefore, the sound-proof sheet member 107 does not float up even in areas where the resonating portion 121 is provided and where the bending strength is high, i.e., no poor attachment occurs, and sufficient sound-proofing effect can be ensured.

The first member 23 has a sound-proof sheet member 108 on the outer surface 66a of the side wall 26 on the outer side in the X direction. The sound-proof sheet member 108 and a part or the entire surface of the housing 21 are adhered to each other at the base 51 by an adhesive, a sticky material, or self-adhesiveness. The area of the sound-proof sheet member 108 is smaller than the area of the opposing surface 66 shown in FIG. 4. The sound-proof sheet member 108 is provided on the outer surface 66a, spaced apart from each edge of the outer surface 66a. Therefore, the sound-proof sheet member 108 does not float up even in areas where the resonating portion 121 is provided and where bending strength is high, i.e., no poor attachment occurs, and sufficient sound-proofing effect can be ensured.

As shown in FIG. 14, the second member 14 has a sound-proof sheet member 121B provided on the facing surface and the outer surface 79Ba on the back side on the outside in the Z direction. The sound-proof sheet member 121B and a part or the entire surface of the housing 11 are adhered to each other at the base 51 by adhesive, adhesive material, or self-adhesiveness. The area of the sound-proof sheet member 121B is smaller than the area of the facing surface 79B shown in FIG. 8. The sound-proof sheet member 121B is provided on the outer surface 79Ba, spaced apart from each edge of the outer surface 79Ba. Therefore, as described above, the sound-proof sheet member 121B does not lift up even in areas where the resonating portion 121 is provided and where bending strength is high, i.e., no poor attachment occurs, and sufficient sound-proofing effect can be ensured.

As shown in FIG. 15, the second member 14 has a sound-proof sheet member 122B provided on the outer surface 77Ba on the outer side of the side wall portion 17B in the Y direction. The sound-proof sheet member 122B and a part or the entire surface of the housing 11 are adhered to each other at the base 51 by an adhesive, a sticky material, or self-adhesiveness. The area of the sound-proof sheet member 122B is smaller than the area of the opposing surface 77B shown in FIG. 8. The sound-proof sheet member 122B is provided on the outer surface 77Ba, spaced apart from each edge of the outer surface 77Ba. Therefore, the sound-proof sheet member 122B does not float up even in areas where the resonating portion 121 is provided and where bending strength is high, i.e., no poor attachment occurs, and sufficient sound-proofing effect can be ensured.

The second member 14 has a sound-proof sheet member 123B on the outer surface 76Ba on the outer side of the side wall portion 16B in the X direction. The sound-proof sheet member 123B and a part or the entire surface of the housing 11 are adhered to each other at the base 51 by an adhesive, a sticky material, or self-adhesiveness. The area of the sound-proof sheet member 123B is smaller than the area of the opposing surface 76B shown in FIG. 9. The sound-proof sheet member 123B is provided on the outer surface 76Ba, spaced apart from each edge of the outer surface 76Ba. Therefore, the sound-proof sheet member 123B does not float even in areas where the resonating portion 121 is provided and where bending strength is high, that is, no poor attachment occurs, and sufficient sound-proofing effect can be ensured.

The first member 13 has a sound-proof sheet member 122A provided on the outer surface 77Aa on the outer side of the side wall portion 17A in the Y direction. The sound-proof sheet member 122A and a part or the entire surface of the housing 11 are adhered to each other at the base 51 by an adhesive, a sticky material, or self-adhesiveness. The area of the sound-proof sheet member 122A is smaller than the area of the opposing surface 77A shown in FIG. 8. The sound-proof sheet member 122A is provided on the outer surface 77Aa, spaced apart from each edge of the outer surface 77Aa. Therefore, the sound-proof sheet member 122A does not lift up even in areas where the resonating portion 121 is provided and where bending strength is high, i.e., no poor attachment occurs, and sufficient sound-proofing effect can be ensured.

The first member 13 has a sound-proof sheet member 123A on the outer surface 76Aa on the outer side of the side wall portion 16A in the X direction. The sound-proof sheet member 123A and a part or the entire surface of the housing 11 are adhered to each other at the base 51 by an adhesive, a sticky material, or self-adhesiveness. The area of the sound-proof sheet member 123A is smaller than the area of the opposing surface 76A shown in FIG. 9. The sound-proof sheet member 123A is provided on the outer surface 76Aa, spaced apart from each edge of the outer surface 76Aa. Therefore, the sound-proof sheet member 123A does not float even in areas where the resonating portion 121 is provided and where bending strength is high, that is, no poor attachment occurs, and sufficient sound-proofing effect can be ensured.

Although the preferred embodiment of the present invention has been described above with reference to the attached drawings, it goes without saying that the present invention is not limited to the examples. The shapes and combinations of the components shown in the above examples are merely examples, and various modifications can be made based on design requirements, etc., without departing from the spirit of the present invention.

For example, in the above embodiment, a configuration in which the sound-insulating sheet member is provided on the inside where the opposing surface is located or on the outside of the back side of the opposing surface is exemplified, but this configuration is not limited to this, and the sound-insulating sheet member may be provided on both the inside where the opposing surface is located and the outside of the back side of the opposing surface.

In addition, in the above embodiment, a configuration in which the opposing surfaces are flat has been exemplified, but this is not limited to this configuration, and the opposing surfaces may be provided on curved surfaces such as smoothly continuous bulges or depressions. Even in this configuration, it is preferable from the viewpoint of preventing the sound-insulating sheet member from floating up to provide the sound-insulating sheet member away from intersections between curved surfaces or points on the curved surfaces that have inflection points.

10...driving power supply device (electronic component), 11, 21, 31...housing (electronic component housing), 12, 22, 32...storage space, 13, 23, 23A...first member, 14...second member, 24, 24A...second member (cover member, surface portion), 20...inverter (electronic component), 30...motor (electronic component), 16A, 16B, 17A, 17B, 26, 26A, 27, 27A...side wall portion (surface portion), 51...base, 66, 66A, 67, 67A, 76A, 76B, 77A, 78A, 79A, 79B...opposing surface, 101, 101A, 102, 102A, 103, 103A, 104A, 104B, 105A, 105B, 106B...sound insulation sheet member, 121...resonating portion (convex portion)

Claims (7)

An electronic component housing for housing electronic components,
the housing has a plurality of surface portions each having a facing surface facing an electronic component;
The plurality of surfaces are connected to each other via intersections,
The surface portion is provided with a resonant sheet member on at least one of an inner side of the opposing surface facing the electronic component and a back side of the opposing surface not facing the electronic component,
The resonator sheet member has a sheet-like sheet surface in contact with the surface portion, and at least one protrusion provided on the sheet surface,
The protrusion has a weight portion,
The resonant sheet member is provided on at least one of the surfaces of the electronic component housing so as to be spaced apart from the intersection portion. 2. The electronic component housing according to claim 1,
The surface portion has a depression formed on a surface thereof,
The electronic component housing has the resonant sheet member provided in the recess. The electronic component housing according to claim 2,
The depth of the recess is equal to or greater than the maximum thickness of the resonator sheet member. The electronic component housing according to claim 2 or 3,
The housing has a side wall portion surrounding the periphery of the opening, and the recess opens into an end face of the side wall portion facing the opening. The electronic component housing according to any one of claims 1 to 4,
The housing includes a first member having an internal storage space and an opening;
a cover member that closes the storage space when joined to the first member,
The facing surface is at least one surface of the first member and the cover member that faces the storage space. The electronic component housing according to any one of claims 1 to 4,
The housing includes a first member having a first storage space therein and an opening;
a second member that has a second storage space therein and is open, and that closes the first storage space and the second storage space when joined to the first member;
The facing surfaces are at least one surface of the first member facing the first storage space and at least one surface of the second member facing the second storage space. The electronic component housing according to any one of claims 1 to 6,
The electronic component is an electronic component housing including any one of a drive power supply device, an inverter, a motor, a junction box, a converter, and a secondary battery.

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