WO2024024792A1 - 駆動ユニット - Google Patents

駆動ユニット Download PDF

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Publication number
WO2024024792A1
WO2024024792A1 PCT/JP2023/027233 JP2023027233W WO2024024792A1 WO 2024024792 A1 WO2024024792 A1 WO 2024024792A1 JP 2023027233 W JP2023027233 W JP 2023027233W WO 2024024792 A1 WO2024024792 A1 WO 2024024792A1
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WIPO (PCT)
Prior art keywords
hollow particles
drive unit
resin
hollow
acrylate
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Ceased
Application number
PCT/JP2023/027233
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English (en)
French (fr)
Japanese (ja)
Inventor
尊 千葉
修一 横山
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Zeon Corp
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Zeon Corp
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Publication date
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Priority to JP2024537753A priority Critical patent/JPWO2024024792A1/ja
Publication of WO2024024792A1 publication Critical patent/WO2024024792A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H02K11/33—Drive circuits, e.g. power electronics
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/02—Casings or enclosures characterised by the material thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating

Definitions

  • the present invention relates to a drive unit.
  • a partition member with a three-layer structure made of two types of heat conductive materials is placed between the motor and the inverter, and the partition member aims to suppress heat transfer between the motor and the inverter.
  • An object of the present invention is to provide a drive unit that can suppress heat transfer between a motor and an inverter and reduce the number of parts.
  • Aspect 1 of the present invention includes a motor, an inverter, a casing that accommodates the motor and the inverter, and a partition member provided between the motor and the inverter, the partition member being , a drive unit which is a molded body having a plurality of voids.
  • Aspect 2 of the present invention is the drive unit according to aspect 1, wherein the molded body is made of a resin composition containing a matrix resin and hollow particles dispersed in the matrix resin. It is a drive unit.
  • Aspect 3 of the present invention is the drive unit according to aspect 2, in which the hollow particle includes an outer shell made of a resin material and a void surrounded by the outer shell.
  • Aspect 4 of the present invention is the drive unit according to aspect 3, in which the resin material constituting the outer shell contains a crosslinkable monomer unit.
  • Aspect 5 of the present invention is the drive unit according to any one of aspects 1 to 4, wherein the drive unit includes a motor provided inside the casing and facing the motor. This is a drive unit having a heat radiating member.
  • Aspect 6 of the present invention is the drive unit according to any one of aspects 1 to 4, wherein the drive unit includes an inverter heat dissipation member provided inside the casing and around the inverter. It is a drive unit having a
  • the partition member provided between the motor and the inverter is composed of a molded body having a plurality of gaps, heat transfer between the motor and the inverter is suppressed, and the number of parts is reduced. It is possible to reduce the amount of
  • FIG. 1 is a sectional view showing the configuration of a drive unit in an embodiment of the present invention.
  • FIG. 1 is a sectional view showing the configuration of a drive unit in this embodiment.
  • the drive unit 1 includes a motor 10, an inverter 20, a housing 30, and a partition member 40.
  • the drive unit 1 is used by being mounted on, for example, a hybrid vehicle, an electric vehicle, or the like.
  • the motor 10 includes a stator 11 and a rotor 12.
  • the stator 11 includes three-phase (U-phase, V-phase, and W-phase) coils (not shown) wound around a stator core. Note that the number of phases of the coil is not particularly limited to three phases.
  • the rotor 12 is arranged inside the stator 11 and fixed to the rotating shaft 13. The rotating shaft 13 is supported by a bearing (not shown).
  • the inverter 20 is electrically connected to the coil of the motor 10 and can supply AC power to the motor 10.
  • the inverter 20 includes a power module, a bus bar, a capacitor, a current sensor, a circuit board, and the like.
  • the housing 30 includes a housing 31 that houses the motor 10 and a housing 32 that houses the inverter 20.
  • the housing 31 has a substantially cylindrical shape that opens upward in the figure (in the Z-axis positive direction).
  • the housing 32 has a substantially cylindrical shape that opens downward in the figure (in the negative Z-axis direction).
  • the casings 31 and 32 can each be made of a material such as aluminum that has excellent heat dissipation properties.
  • the casings 31 and 32 are configured as separate casings, but the present invention is not particularly limited to this, and may be configured as a single casing.
  • a block-shaped heat radiating member 51 is arranged at the bottom of the housing 31 at a position facing the stator 11.
  • the heat dissipation member 51 is in contact with the coil of the stator 11 of the motor 10.
  • a sheet-shaped heat dissipating member 52 is arranged on the inner surface of the housing 32.
  • the heat dissipating members 51 and 52 are formed of a molded body made of a resin composition containing a matrix resin material and a filler, although not particularly limited thereto.
  • matrix resin materials used for the heat dissipation members 51 and 52 include thermosetting resins such as polyimide resin, silicone resin, epoxy resin, and phenol resin, polyphenylene sulfide resin, polycarbonate resin, polybutylene terephthalate resin, and polyacetal resin. Thermoplastic resins can be mentioned.
  • fillers used in the heat dissipation members 51 and 52 include metals such as aluminum and nickel, metal oxides such as aluminum oxide, magnesium oxide, and silicon oxide, metal nitrides such as aluminum nitride and silicon nitride, and silicon carbide.
  • the material constituting the heat dissipating members 51 and 52 is not particularly limited, and may be composed of a metal material such as copper or aluminum, for example. Further, the drive unit 1 does not need to include the heat radiating members 51 and 52.
  • the partition member 40 is placed between the motor 10 and the inverter 20 so as to be sandwiched between the casing 31 and the casing 32, and is fixed to the casing 31 or the casing 32.
  • the partition member 40 has a function as a heat insulating material, and by providing the partition member 40, heat transfer between the motor 10 and the inverter 20 can be suppressed.
  • the position of the partition member 40 is not particularly limited, and may be placed, for example, inside the opening of the housing 31 or the housing 32, coupled to the inner surface of the housing 31 or the housing 32.
  • the partition member 40 has a plate-like shape, it is not particularly limited, and may have a box-like shape that can accommodate the inverter 20, for example.
  • the partition member 40 in this embodiment is constituted by a molded body obtained using a resin composition in which hollow particles are dispersed in a matrix resin material.
  • a heat-resistant resin can be used, and specifically, fluororesin, polyimide, polyamideimide, polyetherimide, polyetheretherketone, polyetherketone, polysulfone, polyethersulfone, polybenzol, etc.
  • fluororesin polyimide, polyamideimide, polyetherimide, polyetheretherketone, polyetherketone, polysulfone, polyethersulfone, polybenzol, etc.
  • examples include imidazole, polyphenylene sulfide, polyethylene naphthalate, polyarylate, aromatic polyamide, polycarbonate, modified polyphenylene ether, polybutylene terephthalate, polyethylene terephthalate, cycloolefin polymer, polypropylene, epoxy resin, phenolic resin and unsaturated polyester resin. These may be used alone or in combination of two or more.
  • Hollow particles include an outer shell and voids surrounded by the outer shell.
  • inorganic hollow particles, organic hollow particles, organic-inorganic composite hollow particles, etc. can be used. It is preferable to use organic hollow particles from the viewpoints of high processing accuracy, easy particle size control of the hollow particles, and ability to reduce weight when formed into a molded product.
  • Inorganic hollow particles include Si-based oxide components (e.g., silica) or Al-based oxide components (e.g., alumina), such as glass balloons, glass bubbles, fly ash balloons, shirasu balloons, silica balloons, and aluminosilicate balloons.
  • Si-based oxide components e.g., silica
  • Al-based oxide components e.g., alumina
  • Glass balloons and glass bubbles can be manufactured by blowing air while flowing a molten material. Fly ash balloons and shirasu balloons can be manufactured using the gas generated when minerals are heated and melted.
  • Ceramic hollow particles can be produced by forming ceramic on the outside of a mold such as oil droplets of an O/W emulsion or polystyrene beads by a sol-gel method, and then removing the mold.
  • organic hollow particles examples include thermoplastic resin particles and thermosetting resin particles.
  • Thermoplastic resins that can be used as hollow particles include monomers with a styrene skeleton (styrene, parachlorostyrene, ⁇ -methylstyrene, etc.), monomers with a (meth)acryloyl group (acrylic acid, methacrylic acid, etc.).
  • (meth)acrylic esters methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, lauryl acrylate, nitrile acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, lauryl methacrylate, 2-ethylhexyl methacrylate, etc.), vinyl acetate, vinyl ethers (e.g.
  • vinyl methyl ether vinyl isobutyl ether, etc.
  • vinyl ketones vinyl methyl ketone, vinyl ethyl ketone, vinyl isopropenyl ketone
  • homopolymers of monomers such as olefins (e.g., ethylene, propylene, butadiene, etc.), or copolymers of two or more of these monomers in a shell.
  • non-vinyl resins epoxy resins, polyester resins, polyurethane resins, polyamide resins, polyamide resins, cellulose resins, polyether resins, modified rosins, etc.
  • mixtures of these and the vinyl resins or , organic hollow particles whose shells are graft polymers obtained by polymerizing vinyl monomers in the coexistence of these.
  • organic hollow particles include crosslinkable hollow particles using a resin containing a crosslinkable monomer unit. From the viewpoint of improving oil resistance, heat insulation, sound insulation, vibration damping, etc. of the partition member 40, it is preferable to use crosslinkable hollow particles as the hollow particles. Hereinafter, suitable crosslinkable hollow particles will be explained.
  • the outer shell of the crosslinkable hollow particles is composed of a resin made of a shell polymer containing crosslinkable monomer units.
  • the shell polymer is a polymer used to form the shell of hollow particles and contains crosslinkable monomer units.
  • the crosslinkable monomer forming the crosslinkable monomer unit is a monomer that has two or more polymerizable functional groups and forms a crosslinking bond in the resin through a polymerization reaction.
  • As the crosslinkable monomer a compound having at least one ethylenically unsaturated bond as a polymerizable functional group is generally used.
  • crosslinkable monomer forming the crosslinkable monomer unit examples include crosslinkable hydrocarbon monomers and heteroatom-containing crosslinkable monomers.
  • crosslinkable hydrocarbon monomer examples include, but are not particularly limited to, difunctional crosslinkable hydrocarbon monomers such as divinylbenzene, divinyldiphenyl, divinylnaphthalene, dicyclopentadiene, and ethylidenetetracyclododecene. Among them, divinylbenzene is preferred.
  • crosslinkable hydrocarbon monomers consisting of polymers can also be used. Examples include polybutadiene, polyisoprene, a block copolymer of styrene and butadiene (SBS), a block copolymer of styrene and isoprene (SIS), and the like.
  • heteroatom-containing crosslinkable monomer examples include, but are not limited to, diallyl phthalate, allyl (meth)acrylate [meaning allyl acrylate and/or allyl methacrylate]. Same below. ], difunctional heteroatom-containing crosslinkable monomers such as ethylene glycol di(meth)acrylate, pentaerythritol di(meth)acrylate; trimethylolpropane tri(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, pentaerythritol di(meth)acrylate, etc.
  • Trifunctional or higher-functional heteroatoms such as erythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, ethoxylated pentaerythritol tetra(meth)acrylate, dipentaerythritol hexa(meth)acrylate, dipentaerythritol poly(meth)acrylate, etc. Containing crosslinkable monomers, etc. can be mentioned.
  • ethylene glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol poly(meth)acrylate and pentaerythritol tri(meth)acrylate are preferred;
  • Glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate and pentaerythritol tetra(meth)acrylate are more preferred, and ethylene glycol dimethacrylate, trimethylolpropane trimethacrylate and pentaerythritol tetramethacrylate are even more preferred.
  • crosslinkable monomers include crosslinkable hydrocarbon monomers, ethylene glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol poly(meth)acrylate, and Pentaerythritol tri(meth)acrylate is preferred, divinylbenzene, ethylene glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate and pentaerythritol tetra(meth)acrylate are more preferred, divinylbenzene, ethylene glycol dimethacrylate, tri More preferred are methylolpropane trimethacrylate and pentaerythritol tetramethacrylate.
  • the crosslinking monomers can be used alone or in combination of two or more.
  • the shell polymer may include a bifunctional crosslinkable monomer unit and a trifunctional or higher functional crosslinkable monomer unit.
  • the shell polymer can also contain a crosslinkable hydrocarbon monomer unit and a heteroatom-containing crosslinkable monomer unit.
  • the shell polymer may consist essentially only of crosslinkable monomer units, or may contain a monofunctional monomer unit in addition to the crosslinkable monomer units.
  • the monofunctional monomer forming the monofunctional monomer unit is a monomer having only one polymerizable functional group, and a compound having an ethylenically unsaturated bond as the polymerizable functional group is generally used. .
  • Examples of the monofunctional monomer forming the monofunctional monomer unit include monofunctional hydrocarbon monomers and heteroatom-containing monofunctional monomers.
  • Monofunctional hydrocarbon monomers include, but are not particularly limited to, aromatic vinyl monomers such as styrene, ethylvinylbenzene, vinyltoluene, ⁇ -methylstyrene, p-methylstyrene, and halogenated styrene; ethylene; Monoolefin monomers such as propylene, butylene and 4-methyl-1-pentene; diene monomers such as butadiene and isoprene; and the like. Among these, styrene and ethylvinylbenzene are preferred.
  • Heteroatom-containing monofunctional monomers are not particularly limited, but include, for example, hydrophilic monofunctional monomers; methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth) ) Acrylic monovinyl monomers such as acrylate, lauryl (meth)acrylate, and glycidyl (meth)acrylate; Cyano group-containing monomers such as acrylonitrile and methacrylonitrile; (meth)aminoethyl acrylate, (meth)acrylic acid Amino group-containing monomers such as dimethylaminoethyl and dimethylaminopropyl (meth)acrylate; carboxylic acid vinyl ester monomers such as vinyl acetate; vinyl halide monomers such as vinyl chloride; halogenated vinylidene chloride etc. Examples include vinylidene monomer; vinylpyridine monomer; urethane (meth
  • the hydrophilic monofunctional monomer preferably has a solubility in water of 1% by mass or more.
  • Hydrophilic monofunctional monomers are not particularly limited, but include, for example, acid group-containing monomers, hydroxyl group-containing monomers, amide group-containing monomers, polyoxyethylene group-containing monomers, etc. Examples include monofunctional monomers having a hydrophilic group.
  • Acid group-containing monomer means a monomer containing an acid group.
  • the acid group here includes both a proton donating group (Brönsted acid group) and an electron pair accepting group (Lewis acid group).
  • the acid group-containing monomer is not particularly limited as long as it has an acid group, and examples thereof include carboxyl group-containing monomers, sulfonic acid group-containing monomers, and the like.
  • carboxyl group-containing monomers examples include ethylenically unsaturated carboxylic acid monomers such as acrylic acid, methacrylic acid, crotonic acid, cinnamic acid, itaconic acid, fumaric acid, maleic acid, and butenetricarboxylic acid; itaconic acid Monoalkyl esters of unsaturated dicarboxylic acids such as monoethyl, monobutyl fumarate, and monobutyl maleate; and the like.
  • the sulfonic acid group-containing monomer include styrene sulfonic acid.
  • hydroxyl group-containing monomer examples include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, and 4-hydroxybutyl (meth)acrylate.
  • amide group-containing monomer examples include acrylamide, dimethylacrylamide, and the like.
  • polyoxyethylene group-containing monomer examples include methoxypolyethylene glycol (meth)acrylate.
  • the monofunctional monomer units can be used alone or in combination of two or more types.
  • the content of crosslinkable monomer units in the shell polymer is not particularly limited, but is preferably 20 to 100% by mass, more preferably 40 to 100% by mass, and 60 to 100% by mass. It is more preferable that the amount is 80 to 100% by mass.
  • the content ratio of monofunctional monomer units in the shell polymer is not particularly limited, but from the viewpoint of obtaining mechanical strength of the hollow particles, it is preferably 0 to 80% by mass, and 0 to 60% by mass.
  • the amount is more preferably 0 to 40% by weight, even more preferably 0 to 20% by weight.
  • the shell polymer may include heteroatom-containing monomer units.
  • the heteroatom-containing monomer forming the heteroatom-containing monomer unit include the above-mentioned heteroatom-containing crosslinkable monomers and heteroatom-containing monofunctional monomers.
  • the content ratio of heteroatom-containing monomer units in the shell polymer is not particularly limited, but is preferably 1 to 99% by mass, more preferably 5 to 95% by mass, and 10 to 90% by mass. It is even more preferable that there be.
  • the method for producing crosslinkable hollow particles is not particularly limited, but for example, a method for producing hollow particles by polymerizing a suspension containing a crosslinkable monomer, a hydrophobic organic solvent, a polymerization initiator, and an aqueous medium.
  • a method for obtaining precursor particles, removing a hydrophobic solvent from the precursor particles by bubbling, and then removing an aqueous solvent, and a method for removing a suspension containing a crosslinkable monomer, a hydrophobic organic solvent, a polymerization initiator, and an aqueous medium One method is to obtain precursor particles with hollow parts by subjecting a suspension to a polymerization reaction, perform solid-liquid separation to separate the precursor particles, and then remove the hydrophobic solvent in the precursor particles in air. It will be done.
  • the hydrophobic organic solvent is not particularly limited, but hydrocarbon solvents can be suitably used, and specific examples include saturated hydrocarbon solvents such as butane, pentane, n-hexane, cyclohexane, heptane, and octane; Examples include aromatic hydrocarbon solvents such as benzene, toluene, and xylene, and relatively highly volatile solvents such as carbon disulfide and carbon tetrachloride.
  • polymerization initiator examples include benzoyl peroxide, lauroyl peroxide, t-butylperoxide-2-ethylhexanoate, t-butylperoxydiethyl acetate, t-butylperoxypivalate, 2,2'-azobis(2 , 4-dimethylvaleronitrile), azobisisobutyronitrile, and the like.
  • the polymerization method there is no particular limitation on the polymerization method, and for example, a batch method, a semi-continuous method, a continuous method, etc. can be adopted.
  • the polymerization temperature is preferably 40 to 90°C, more preferably 50 to 80°C.
  • the reaction time for polymerization is preferably 1 to 48 hours, more preferably 3 to 24 hours.
  • the crosslinkable hollow particles are not limited to those mentioned above as long as they can form a shell having a three-dimensional crosslinked structure.
  • Shell polymers include, for example, phenolic resins, melamine resins, urea resins, unsaturated polyester resins, epoxy resins, polyurethane resins, silicon resins, alkyd resins, thermosetting modified polyphenylene ether resins, Thermosetting polyimide resin, benzoxazine resin, urea resin, allyl resin, aniline resin, maleimide resin, bismaleimide triazine resin, liquid crystalline polyester resin, vinyl ester resin, unsaturated polyester resin , cyanate ester resin, polyetherimide resin, etc.
  • the organic hollow particles may have outer shells surface-treated with a coupling agent.
  • the coupling agent has a functional group capable of bonding with an organic substance and a functional group capable of bonding with an inorganic substance in one molecule, and is capable of increasing the affinity between the organic material and the inorganic material.
  • the coupling agent preferably has a functional group in its molecular structure that can undergo a crosslinking reaction with the above-mentioned matrix resin material.
  • the functional group capable of crosslinking with the matrix resin material is appropriately selected depending on the type of the base elastomer, and is not particularly limited, but includes, for example, a hydroxyl group, a carboxyl group, a carbonyl group, an amino group, a mercapto group, a halogen group, and a vinyl group. , methacryloyl group, acryloyl group, siloxyl group, peroxide group, epoxy group and the like.
  • the coupling agent include a silane coupling agent, a titanium coupling agent, and an aluminum coupling agent.
  • organic-inorganic composite hollow particles examples include hollow particles having an outer shell made of a combination of the above-mentioned inorganic materials and organic materials.
  • the method for producing organic-inorganic composite hollow particles is not particularly limited, but for example, a polymerizable silane coupling agent having a vinyl group, acrylic group, methacrylic group, styryl group, etc. inside the structure and a non-polymerizable organic solvent may be used.
  • Emulsion polymerization drop-type emulsion polymerization, soap-free polymerization, microemulsion polymerization, miniemulsion polymerization, microsuspension polymerization; silane cup with an epoxy group, isocyanate group, ureido group, amino group, mercapto group, or halogen group inside the structure Interfacial polymerization using a ring agent; Appropriate polymerization methods include a method in which the surfaces of organic hollow particles prepared in advance are coated with silica using a silane coupling agent.
  • the volume average particle diameter (Dv) of the hollow particles is not particularly limited, but is preferably 0.1 to 100 ⁇ m, more preferably 1 to 50 ⁇ m, even more preferably 5 to 45 ⁇ m, particularly preferably 2 to 40 ⁇ m.
  • Particle size distribution (Dv/Dn) of hollow particles is not particularly limited, but is preferably 1.02 to 2.00, more preferably 1.04 to 1.60, more preferably 1.06 to 1.40, particularly preferably 1.06 to 1.30, particularly preferably 1.08 to 1.25, most preferably 1.10 to 1.20. Since the particle size distribution (Dv/Dn) of the hollow particles is within the above range, when the hollow particles are blended into a matrix resin and pressure molded, deformation of the hollow particles is suppressed, and the effect of adding the hollow particles is suppressed. (For example, weight reduction) can be made sufficient.
  • a hollow particle is a particle that includes a shell (outer shell) and a hollow part (void) surrounded by the shell.
  • the hollow portion is a hollow space that is clearly distinguished from the shell of the hollow particle formed of resin.
  • the hollow particles may have one or more hollow parts, but preferably have only one hollow part in order to maintain a good balance between high porosity and mechanical strength.
  • the number ratio of hollow particles having only one hollow part is preferably 90% or more, more preferably 95% or more, and even more preferably more than 95%.
  • a cross section of a sample made by curing an epoxy resin in which hollow particles are dispersed is observed using a TEM (transmission electron microscope).
  • One method is to calculate the By calculating the number ratio of the cross sections of hollow particles with only one hollow part among the cross sections of 100 to 150 hollow particles present in the cross section of the sample observed by TEM, the number of hollow parts in the hollow particles can be calculated by calculating the number of cross sections of hollow particles with only one hollow part. It is possible to determine the number ratio of particles having only
  • the sample is preferably a thin piece prepared by cooling an epoxy resin in which hollow particles are dispersed to -80° C., curing it, and cutting it with a microtome.
  • the concentration of hollow particles in the cross section of the sample is preferably adjusted to such a level that a cross section of 30 to 50 hollow particles can be observed within a range of 56 ⁇ m x 70 ⁇ m, for example.
  • the number of hollow portions is determined based on the image of the observed cross section. It is preferable to exclude from the evaluation a particle cross section that is twice or more the volume average particle diameter, a particle cross section that is less than 10% of the volume average particle diameter, and a cross section of hollow particles in which no hollow portion is shown.
  • the above method is an example, and the method for determining the number ratio of particles having only one hollow portion is not particularly limited.
  • Hollow particles usually have a shell that does not have communicating holes or shell defects, and the hollow part is isolated from the outside of the particle by the shell, but hollow particles have one or more communicating holes and a hollow part. may communicate with the outside of the particle via the communication hole.
  • one hollow particle may have two or more hollow parts. In this case, the two or more hollow parts may exist independently, or the two or more hollow parts may be connected.
  • the hollow portion may be filled with a gas such as air, or may contain a solvent.
  • the shape of the hollow particles is not particularly limited as long as a hollow part is formed inside.
  • the outer shape of the hollow particles is not particularly limited, a spherical shape is preferable from the viewpoint of ease of production.
  • the hollow particles may contain a small amount of particles with low circularity that are cracked or deformed as impurities, but from the viewpoint of further enhancing the effects of the present disclosure, based on 100% by mass of the hollow particles,
  • the proportion of particles with a circularity of 0.85 or less is preferably less than 15% by weight, more preferably less than 10% by weight, even more preferably less than 8% by weight.
  • the external shape of the hollow particles can be confirmed, for example, by observing the particles with a SEM or TEM. Further, the internal shape of the hollow particles can be confirmed, for example, by SEM observation of a cross section of the particles or TEM observation of the particles.
  • the true density of the hollow particles is not particularly limited, but is preferably 0.95 to 1.4 g/cm 3 , more preferably 1.0 to 1.3 g/cm 3 .
  • the true density of a hollow particle means the density of only the shell portion of the hollow particle.
  • the true density of hollow particles is measured by the following method. After crushing the hollow particles in advance, approximately 10 g of the crushed pieces of the hollow particles are filled into a volumetric flask with a capacity of 100 cm 3 , and the mass of the filled crushed pieces is accurately weighed. Next, isopropanol is added to the volumetric flask in the same manner as in the measurement of the apparent density, the mass of the isopropanol is accurately weighed, and the true density (g/cm 3 ) of the hollow particles is calculated based on the following formula (I).
  • True density of hollow particles (g/cm 3 ) [mass of crushed pieces of hollow particles] ⁇ (100 - [mass of isopropanol] ⁇ [density of isopropanol at measurement temperature]) (I)
  • the porosity of the hollow particles is preferably 40 to 95%, more preferably 50 to 90%, even more preferably 55 to 88%, particularly preferably 60 to 85%, and most preferably 65 to 80%.
  • the weight of the partition member 40 made of a molded body containing hollow particles can be further reduced.
  • the porosity of the hollow particles is calculated from the apparent density D 1 and the true density D 0 of the hollow particles.
  • the apparent density D1 corresponds to the density of the entire hollow particle when the hollow portion is considered to be a part of the hollow particle.
  • the porosity is determined by assuming that the density of the components other than those constituting the shell is equal to the true density D 0 of the hollow particle.
  • the apparent density D1 is calculated using the mass including the mass of components other than the components constituting the shell, and then the apparent density D1 calculated in this way is used. Then, calculate the porosity of the hollow particles.
  • the molded body constituting the partition member 40 is made of a resin composition obtained by mixing the above matrix resin and hollow particles.
  • the resin composition is obtained by mixing the above-mentioned matrix resin and hollow particles with compounding agents used as necessary. Specifically, a method of mixing by adding hollow particles and a compounding agent used as needed to a melted matrix resin and melt-kneading the mixture can be mentioned. In this case, all the components may be supplied to the melt kneading machine independently, or on the other hand, after premixing some of the components, the premixed components and the remaining components are independently melted. It may also be fed to a kneader.
  • the resin composition may be a liquid resin composition.
  • liquid resin compositions include those containing a liquid matrix resin before a curing reaction, those obtained by dissolving or dispersing each component in a solvent, or those in which the matrix resin is a thermoplastic resin and the resin is melted. Examples include those in which the resin composition is in a liquid state due to the above-mentioned conditions.
  • the matrix resin, hollow particles, and compounding agents used as necessary are kneaded using, for example, a kneader, roll mill, Brabender, single-screw extruder, twin-screw extruder, multi-screw extruder, etc. be able to.
  • the content of hollow particles in 100% by mass of the total solid content of the resin composition is not particularly limited, but is preferably 5 to 50% by mass.
  • the content of hollow particles is equal to or greater than the lower limit value, the weight reduction effect of the hollow particles can be fully exhibited.
  • the content of hollow particles is equal to or less than the upper limit value, the resin can be sufficiently contained, so that the mechanical strength of the molded article can be improved.
  • the resin composition may contain additives such as a curing agent, curing catalyst, initiator, compatibilizer, ultraviolet absorber, colorant, heat stabilizer, filler, etc., as necessary, within a range that does not impair the effects of the present disclosure. It may further contain a solvent or the like. Moreover, the resin composition may further contain organic or inorganic fibers such as carbon fibers, glass fibers, aramid fibers, and polyethylene fibers.
  • a molded article can be obtained by molding a resin composition containing a matrix resin and hollow particles into a desired shape using a known molding method such as extrusion molding, injection molding, press molding, compression molding, or the like.
  • the resin composition is a liquid resin composition
  • it is a liquid resin composition formed by containing hollow particles etc. in a liquid matrix resin before a curing reaction, or a liquid resin composition formed by dissolving or dispersing each component in a solvent.
  • a molded article can be obtained by applying a liquid resin composition to a support, and drying and curing the composition as necessary.
  • a resin molded article can also be obtained by impregnating a base material with a liquid resin composition, and drying and curing the base material, if necessary.
  • the material for the support include resins such as polyethylene terephthalate and polyethylene naphthalate; metals such as copper, aluminum, nickel, chromium, gold, and silver. The surface of these supports may be coated with a mold release agent.
  • liquid resin composition As a method for applying the liquid resin composition, known methods can be used, such as dip coating, roll coating, curtain coating, die coating, slit coating, and gravure coating.
  • the drying temperature is preferably a temperature at which the matrix resin does not harden, and is usually 20°C or more and 200°C or less, preferably 30°C or more and 150°C or less. Further, the drying time is usually 30 seconds or more and 1 hour or less, preferably 1 minute or more and 30 minutes or less.
  • the curing reaction of the resin composition is carried out by a method depending on the type of matrix resin, and is not particularly limited.
  • the heating temperature for the curing reaction is appropriately adjusted depending on the type of resin, and is not particularly limited, but is usually 30°C or higher and 400°C or lower, preferably 70°C or higher.
  • the temperature is 300°C or less, more preferably 100°C or more and 200°C or less.
  • the curing time is 5 minutes or more and 5 hours or less, preferably 30 minutes or more and 3 hours or less.
  • the heating method is not particularly limited, and may be performed using, for example, an electric oven.
  • the liquid matrix resin before the curing reaction and the matrix resin dissolved or dispersed in the solvent may be a thermosetting resin or a thermoplastic resin.
  • the partition member 40 in this embodiment is made of a molded body made of a resin composition containing hollow particles and a matrix resin, so that it has a structure made of a single member having a plurality of voids. Thereby, it is possible to reduce the number of parts while suppressing heat transfer between the motor 10 and the inverter 20.
  • the partition member 40 is made of a molded body in which hollow particles are dispersed, but the structure of the partition member 40 is not particularly limited to this.
  • the partition member 40 may be formed of a molded body having a structure in which a plurality of solid particles are connected in a chain, with spaces between the solid particles.
  • the partition member 40 may be made of a porous molded body such as a nonwoven fabric or a foamed molded body.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
PCT/JP2023/027233 2022-07-26 2023-07-25 駆動ユニット Ceased WO2024024792A1 (ja)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05236705A (ja) * 1992-02-21 1993-09-10 Fanuc Ltd 電動機の冷却装置
WO2013125339A1 (ja) * 2012-02-21 2013-08-29 アイシン精機株式会社 電動ポンプ
JP2014138489A (ja) * 2013-01-17 2014-07-28 Nissan Motor Co Ltd インバータ付きモータ
JP2021008550A (ja) * 2019-06-28 2021-01-28 東京応化工業株式会社 硬化性樹脂組成物及び硬化物

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05236705A (ja) * 1992-02-21 1993-09-10 Fanuc Ltd 電動機の冷却装置
WO2013125339A1 (ja) * 2012-02-21 2013-08-29 アイシン精機株式会社 電動ポンプ
JP2014138489A (ja) * 2013-01-17 2014-07-28 Nissan Motor Co Ltd インバータ付きモータ
JP2021008550A (ja) * 2019-06-28 2021-01-28 東京応化工業株式会社 硬化性樹脂組成物及び硬化物

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