WO2017077913A1 - 固定構造 - Google Patents

固定構造 Download PDF

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Publication number
WO2017077913A1
WO2017077913A1 PCT/JP2016/081684 JP2016081684W WO2017077913A1 WO 2017077913 A1 WO2017077913 A1 WO 2017077913A1 JP 2016081684 W JP2016081684 W JP 2016081684W WO 2017077913 A1 WO2017077913 A1 WO 2017077913A1
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WO
WIPO (PCT)
Prior art keywords
hole
protrusion
heat
metal plate
heat caulking
Prior art date
Application number
PCT/JP2016/081684
Other languages
English (en)
French (fr)
Inventor
俊治 鰺坂
Original Assignee
タイコエレクトロニクスジャパン合同会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by タイコエレクトロニクスジャパン合同会社 filed Critical タイコエレクトロニクスジャパン合同会社
Priority to EP16861975.7A priority Critical patent/EP3372387A4/en
Priority to CN201680063210.2A priority patent/CN108349169A/zh
Publication of WO2017077913A1 publication Critical patent/WO2017077913A1/ja
Priority to US15/968,923 priority patent/US20180244017A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/08—Interconnection of layers by mechanical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/60—Riveting or staking
    • B29C65/606—Riveting or staking the rivets being integral with one of the parts to be joined, i.e. staking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/64—Joining a non-plastics element to a plastics element, e.g. by force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/004—Preventing sticking together, e.g. of some areas of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
    • B29C66/324—Avoiding burr formation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/731—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the intensive physical properties of the material of the parts to be joined
    • B29C66/7311—Thermal properties
    • B29C66/73113—Thermal conductivity
    • B29C66/73114—Thermal conductivity of different thermal conductivity, i.e. the thermal conductivity of one of the parts to be joined being different from the thermal conductivity of the other part
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/74—Joining plastics material to non-plastics material
    • B29C66/742—Joining plastics material to non-plastics material to metals or their alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/088—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/09—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0012—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular thermal properties
    • B29K2995/0013—Conductive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3002—Superstructures characterized by combining metal and plastics, i.e. hybrid parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/302—Conductive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24008—Structurally defined web or sheet [e.g., overall dimension, etc.] including fastener for attaching to external surface

Definitions

  • the present invention relates to a fixing structure for fixing a member having a high thermal conductivity made of, for example, metal or the like by heat caulking or the like.
  • Patent Document 1 discloses a structure of heat caulking in a connector.
  • heat caulking is a technique for heating and melting the protrusions. For this reason, when the projection is melted, there is a problem that the molten resin flows into the gap between the projection and the wall surface of the through hole, and the gap is filled.
  • Patent Document 2 shows a structure in which a gap is provided between a protrusion and a through hole.
  • the technique proposed in Patent Document 2 is a technique for reliably filling the gap between the protrusion and the wall surface of the through hole, and is a technique that is incompatible with the problem presented here.
  • an object of the present invention is to provide a fixing structure in which a gap is secured between a wall surface of a through hole and a protrusion.
  • thermoplastic first member having a protrusion
  • second member having a first through hole having a diameter larger than the diameter of the protrusion, and having a higher thermal conductivity than the first member
  • a second through hole that communicates with the first through hole and penetrates the protrusion, and is placed on the second member and sandwiches the second member between the first member and the first member
  • a sheet-like third member having a lower thermal conductivity than the first member
  • the fixing structure of the present invention includes a sheet-like third member laid on the second member and having a thermal conductivity lower than that of the first member.
  • the second through hole is preferably a through hole having a smaller diameter than the first through hole.
  • the first member is a member made of a resin material
  • the second member is a member made of a metal material
  • the second member is formed by heat caulking of the protrusion. It may be fixed to the first member.
  • the present invention is specifically suitable for such a fixing structure.
  • a clearance is secured between the wall surface of the through hole and the protrusion, and a fixing structure that avoids the occurrence of distortion due to the difference in coefficient of thermal expansion is realized.
  • bus bar which constitutes one of the devices mounted on the automobile. It is sectional drawing which showed the heat crimping structure employ
  • FIG. 1 is a schematic diagram of a part called a bus bar that constitutes one of the devices mounted on a car.
  • the component 100 is a component that transfers electric power by the two metal plates 10 and 10.
  • the resin plate 20 is interposed between the two metal plates 10 and 10.
  • the resin plate 20 keeps the distance between the two metal plates 10 and 10 constant and performs electrical insulation between the two metal plates 10 and 10.
  • Each of the two metal plates 10 and 10 is fixed to the resin plate 20 by heat caulking.
  • FIG. 1 shows a plurality (five in FIG. 1) of heat caulking heads 22 for fixing the metal plate 10 on the upper surface side of FIG. 1 to the resin plate 20 by heat caulking.
  • a sheet material 30 is sandwiched between the head 22 and the metal plate 10.
  • the metal plate 10 on the lower surface side in FIG. 1 is also fixed to the resin plate 20 by the same heat caulking structure.
  • the resin plate 20 corresponds to an example of the first member referred to in the present invention.
  • Each of the two metal plates 10, 10 corresponds to an example of a second member according to the present invention.
  • the sheet material 30 corresponds to an example of a sheet-like third member referred to in the present invention.
  • FIG. 2 is a cross-sectional view showing a heat caulking structure employed in the component shown in FIG. Here, only one of the two metal plates and the structure of one heat caulking portion are shown.
  • FIG. 2 (A) shows a state before heat caulking and before the sheet material is arranged.
  • FIG. 2B shows a state after the sheet material is arranged before heat caulking.
  • FIG. 2C shows a state after heat caulking.
  • the resin plate 20 is a member made of a thermoplastic resin and has a heat caulking projection 21.
  • the resin plate 20 in the present embodiment is made of PBT (polybutylene terephthalate).
  • the thermal conductivity of the resin plate 20 is about 0.29 W / mK.
  • the metal plate 10 is made of a copper alloy and has a through hole 11 here.
  • the through hole 11 corresponds to an example of the first through hole referred to in the present invention.
  • the metal plate 10 has a thermal conductivity of about 400 W / mK, which is much higher than that of the resin plate 10.
  • the heat caulking protrusion 21 is inserted into the through hole 11 as shown in FIG.
  • the through hole 11 formed in the metal plate 10 is a through hole having a diameter larger than that of the heat caulking protrusion 21 provided in the resin plate 20. For this reason, a gap is formed between the heat caulking projection 21 inserted through the through hole 11 and the wall surface 11 a of the through hole 11.
  • the sheet material 30 is laid on the metal plate 10 so that the metal plate 10 is sandwiched between the sheet material 30 and the resin plate 20, as shown in FIG.
  • the sheet material 30 is formed with a through hole 31 that communicates with the through hole 11 formed in the metal plate 10.
  • the through hole 31 corresponds to an example of a second through hole according to the present invention.
  • the through hole 31 has a smaller diameter than the first through hole 11 and is a through hole having a size that allows the heat caulking protrusion 21 to pass through.
  • This sheet material 30 has a lower thermal conductivity than the resin plate 20.
  • a fluorine sheet or a polyimide sheet having a thermal conductivity of about 0.2 W / mK is employed.
  • the heat resistant temperature of the sheet material 30 needs to be equal to or higher than the melting point of the resin plate 20.
  • the sheet material 30 needs to have heat resistance of 223 ° C. or higher.
  • a heat-caulking head (not shown) is directed to the heat-caulking protrusion 21, and the heat-caulking protrusion 21 is heated and melted. Then, once the heat-caulking protrusion 21 that has been melted is cooled, a heat-caulking head 22 made of resin as shown in FIG. 2C is formed.
  • the metal plate 10 is fixed to the resin plate 10 by the head portion 22.
  • One of the sheet materials 30 has a role of preventing molten resin from entering the gap between the heat caulking protrusion 21 and the wall surface 11 a of the first through hole 11. Further, the sheet material 30 further plays a role of preventing the heat during caulking from being transmitted to the metal plate 10.
  • the molten resin is partly the wall surface of the heat caulking protrusion 21 and the first through hole 11. 11a.
  • heat is immediately transmitted through the metal plate 10 having extremely high thermal conductivity, and even the portion of the heat caulking projection 21 entering the first through hole 11 is immediately melted. Will end up. Due to these two causes, the gap between the heat caulking protrusion 21 and the wall surface 11a of the first through hole 11 is filled with the molten resin, and the gap may not be secured.
  • the metal plate 10 and the resin plate 20 are also greatly different in thermal expansion coefficient. For this reason, when the ambient temperature becomes high without securing the clearance, distortion occurs there, and the component 100 shown in FIG. 1 may be deformed and may not operate correctly.
  • the sheet material 30 having a low thermal conductivity and having a small-diameter through hole 31 is laid, the gap is reliably ensured. Therefore, the dimensional change due to the difference in the coefficient of thermal expansion is absorbed by the gap, and deformation such as distortion and warping of the component 100 shown in FIG. 1 is prevented even under a high temperature environment.
  • the fixing structure of the present invention is not limited to fixing by heat caulking. That is, the fixing structure of the present invention may employ an overmolding fixing method in which molten resin or the like is poured so as to cover the protrusions corresponding to the heat caulking protrusions 21 in the above-described embodiment.
  • the present invention is not limited to the metal plate 10 and the resin plate 20.
  • the fixing structure of the present invention can be widely used when a member having high thermal conductivity is fixed by heat caulking or overmolding.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Connection Of Plates (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

貫通孔壁面と突起との間に隙間が確保された固定構造を提供する。　金属板１０を樹脂板２０に熱かしめ固定によりするにあたり、金属板１０に、樹脂板２０に形成された熱かしめ突起２１よりも大径の貫通孔１１を形成する。そして、その金属板１０の上に、熱伝導率の低いシート材３０を敷く。このシート材３０には、熱かしめ突起２１が貫通するだけの細径の貫通孔３１が設けられている。そして、このシート材３０を敷いた状態で、熱かしめ突起２１を加熱、溶融することにより、金属板１０を樹脂板２０に熱かしめ固定する。

Description

固定構造
　本発明は、例えば金属等からなる高い熱伝導率を有する部材を熱かしめ等により固定する固定構造に関する。
　部材を熱かしめにより固定する構造が、カメラや携帯電話、その他の様々な機器で採用されている。例えば特許文献１には、コネクタにおける熱かしめの構造が示されている。
　ここで、自動車に搭載されている機器において、高い熱伝導率を有する金属部材を樹脂の熱かしめにより固定する構造について考察する。
　自動車のエンジンルーム内に搭載される機器の場合、例えば－４０～１５０℃の広い温度範囲でその動作が保証される必要がある。これを実現するため、上記の固定構造についても工夫が必要となる。すなわち、金属と樹脂とでは熱伝導率だけでなく熱膨張率も大きく異なっている。このため、樹脂材料に設けられる熱かしめ用の突起の径よりも、金属材料に形成される、その突起を貫通させる貫通孔の径を大径にする必要がある。すなわち、貫通孔壁面と突起との間に隙間を持たせておき、熱膨張率の違いによる寸法変化をその隙間で吸収することで歪みの発生を抑える必要がある。
　一方、熱かしめは、上記の突起を加熱して溶融させる技術である。このため、突起の溶融時に、溶融した樹脂がその突起と貫通孔壁面との間の隙間に流れ込み、その隙間が埋められてしまうという問題がある。
　特許文献２には、突起と貫通孔との間に隙間を空けた構造が示されている。しかしながら、この特許文献２に提案された技術は、突起と貫通孔壁面との間の隙間を確実に埋めるための技術であって、ここで提起している問題とは相入れない技術である。
特開２００３－２６４０２５号公報 特開２００８－１６２１２５号公報
　本発明は、上記事情に鑑み、貫通孔壁面と突起との間に隙間が確保された固定構造を提供することを目的とする。
　上記目的を達成する本発明の固定構造は、
　突起を有する、熱可塑性の第１の部材と、
　上記突起の径よりも大径である第１の貫通孔を有する、上記第１の部材よりも高い熱伝導率を有する第２の部材と、
　上記第１の貫通孔と連通して上記突起を貫通させる第２の貫通孔を有し、上記第２の部材の上に敷かれてその第２の部材を第１の部材との間に挟む、第１の部材よりも低い熱伝導率を有するシート状の第３の部材とを備え、
　上記突起の、第１の貫通孔および第２の貫通孔を貫通した部分の熱変形もしくはその部分へのオーバーモールドにより、上記第２の部材が上記第１の部材に固定されていることを特徴とする。
　本発明の固定構造は、第２の部材の上に敷かれた、第１の部材よりも低い熱伝導率を有するシート状の第３の部材を備えている。
　このため、熱かしめにおける熱、あるいはオーバーモールドによる熱が第３の部材で遮られ、突起の、貫通孔の壁面に対面している部分には、熱が伝わり難い。また、熱かしめあるいは、オーバーモールドによる溶融した材料は、第３の部材に遮られて突起と貫通孔壁面との間の隙間への侵入が妨げられる。このようにして、突起と貫通孔壁面との間に隙間が確保される。
　ここで、本発明の固定構造において、上記第２の貫通孔が、上記第１の貫通孔よりも小径の貫通孔であることが好ましい。
　こうすることにより、その隙間への溶融材料の侵入が一層確実に防止される。
　また、本発明の固定構造は、上記第１の部材が樹脂材料からなる部材であり、上記第２の部材が金属材料からなる部材であって、上記突起の熱かしめにより、第２の部材が第１の部材に固定されているものであってもよい。
　本発明は、具体的には、このような固定構造に好適である。
　以上の本発明によれば、貫通孔壁面と突起との間に隙間が確保され、熱膨張率の違いによる歪みの発生を避けた固定構造が実現する。
自動車に搭載される機器の１つを構成するバスバーと呼ばれる部品の概要図である。 図１に示す部品で採用されている熱かしめ構造を示した断面図である。
　以下、本発明の実施の形態を説明する。
　図１は、自動車に搭載される機器の１つを構成するバスバーと呼ばれる部品の概要図である。
　この部品１００は、２枚の金属板１０，１０により電力を移送する部品である。この部品１００では、２枚の金属板１０，１０の間に樹脂板２０が介在している。その樹脂板２０は、２枚の金属板１０，１０の間隔を一定に維持するとともに、２枚の金属板１０，１０どうしの間の電気的な絶縁を担っている。２枚の金属板１０，１０のそれぞれは、熱かしめにより、樹脂板２０に固定されている。この図１には、図１の上面側の金属板１０を熱かしめにより樹脂板２０に固定する、複数（この図１では５つ）の熱かしめの頭部２２があらわれている。その頭部２２と金属板１０との間にはシート材３０が挟まれている。この図１の下面側の金属板１０も、同様の熱かしめ構造により、樹脂板２０に固定されている。
　本実施形態では、樹脂板２０が、本発明にいう第１の部材の一例に相当する。また、２枚の金属板１０，１０のそれぞれが、本発明にいう第２の部材の一例に相当する。さらに、シート材３０が、本発明にいうシート状の第３の部材の一例に相当する。
　図２は、図１に示す部品で採用されている熱かしめ構造を示した断面図である。ここでは、２枚の金属板のうちの一方の金属板、かつ、１つの熱かしめ部分の構造のみが示されている。
　ここで、図２（Ａ）は熱かしめ前であって、かつ、シート材配置前の状態を示している。また、図２（Ｂ）は熱かしめ前であって、シート材を配置した後の状態を示している。さらに、図２（Ｃ）は、熱かしめ後の状態を示している。
　樹脂板２０は、熱可塑性の樹脂からなる部材であり、熱かしめ突起２１を有する。具体的には、本実施形態における樹脂板２０は、ＰＢＴ（ポリブチレンテレフタラート）を材料としている。この樹脂板２０の熱伝導率は約０．２９Ｗ／ｍＫである。また、金属板１０は、ここでは銅合金からなり、貫通孔１１を有する。この貫通孔１１は、本発明にいう第１の貫通孔の一例に相当する。この金属板１０の熱伝導率は約４００Ｗ／ｍＫであって、樹脂板１０と比べ極めて高い熱伝導率を有する。ここで、熱かしめ突起２１は、熱かしめにあたり、図２（Ａ）に示すように、貫通孔１１に挿通される。この金属板１０に形成されている貫通孔１１は、樹脂板２０に設けられている熱かしめ突起２１の径よりも大径の貫通孔である。このため、この貫通孔１１に挿通された熱かしめ突起２１と、この貫通孔１１の壁面１１ａとの間には、隙間が形成されている。
　熱かしめにあたっては、さらに、図２（Ｂ）に示すように、シート材３０が、樹脂板２０との間に金属板１０を挟むようにして、金属板１０の上に敷かれる。このシート材３０には、金属板１０に形成されている貫通孔１１と連通する貫通孔３１が形成されている。この貫通孔３１は、本発明にいう第２の貫通孔の一例に相当する。この貫通孔３１は、第１の貫通孔１１よりも小径であって、熱かしめ突起２１がぎりぎり通る程度の寸法の貫通孔である。このシート材３０は、樹脂板２０よりも低い熱伝導率を有する。具体的には、本実施形態では、熱伝導率が約０．２Ｗ／ｍＫのフッ素系シート、あるいはポリイミド系シートが採用されている。また、シート材３０の耐熱温度は、樹脂板２０の融点以上であることを要する。例えば、樹脂板２０がＰＢＴ製の場合、シート材３０は２２３℃以上の耐熱性が必要である。
　図２（Ｂ）に示すようにシート材３０を敷いた後、熱かしめ突起２１に熱かしめヘッド（不図示）が宛てがわれて、熱かしめ突起２１が加熱、溶融される。そして、一旦溶融した熱かしめ突起２１が冷えると、図２（Ｃ）に示す、樹脂による熱かしめの頭部２２が形成される。金属板１０は、この頭部２２により、樹脂板１０に固定される。このシート材３０は、１つには、溶融した樹脂が熱かしめ突起２１と第１の貫通孔１１の壁面１１ａとの間の隙間に入り込むことを防ぐ役割を担っている。また、このシート材３０は、さらに、熱かしめの際の熱が金属板１０に伝わるのを防ぐ役割を担っている。
　ここで、仮に、シート材３０を敷かずに、図２（Ａ）の状態で熱かしめを行なうと、１つには、溶融した樹脂が、熱かしめ突起２１と第１の貫通孔１１の壁面１１ａとの間の隙間に入り込むことになる。また、もう１つには、極めて高い熱伝導率を有する金属板１０を経由して熱が直ちに伝わり、熱かしめ突起２１の第１の貫通孔１１に入り込んでいる部分までもが直ぐに溶融してしまうことになる。この２つの原因により、熱かしめ突起２１と第１の貫通孔１１の壁面１１ａとの間の隙間が溶融樹脂で埋められてしまい、その隙間が確保されないおそれがある。
　ここで、金属板１０と樹脂板２０は、熱膨張率も大きく異なっている。このため、その隙間が確保されていないまま環境温度が高温になると、そこで歪みが生じ、図１に示す部品１００が変形してしまい、正しく動作しなくなるおそれがある。本実施形態の場合、熱伝導率の低い、かつ、小径の貫通孔３１が形成されたシート材３０が敷かれているため、その隙間が確実に確保される。したがって、熱膨張率の違いのよる寸法変化は、その隙間で吸収され、高温環境下にあっても、図１に示す部品１００の歪みや反り等の変形が防止される。
　なお、ここでは、熱かしめ突起２１を加熱、溶融し、熱かしめにより金属板１０を樹脂板２０に固定する固定構造について説明した。ただし、本発明の固定構造は熱かしめによる固定に限られるものではない。すなわち、本発明の固定構造は、溶融した樹脂等を、上述の実施形態における熱かしめ突起２１に相当する突起を覆うように流し込むオーバーモールドによる固定方法を採用したものであってもよい。
　また、ここでは、金属板１０を樹脂板２０に固定する例について説明したが、本発明は、金属板１０、樹脂板２０に限られるものではない。本発明の固定構造は、熱伝導率の高い部材を熱かしめあるいはオーバーモールドで固定する場合に、広く採用することができる。
１０　金属板
１１　貫通孔
１１ａ　壁面
２０　樹脂板
２１　熱かしめ突起
２２　頭部
３０　シート材
３１　貫通孔
１００　部品

Claims (3)

  1. 　突起を有する、熱可塑性の第１の部材と、
    　前記突起の径よりも大径である第１の貫通孔を有する、前記第１の部材よりも高い熱伝導率を有する第２の部材と、
    　前記第１の貫通孔と連通して前記突起を貫通させる第２の貫通孔を有し、前記第２の部材の上に敷かれて該第２の部材を前記第１の部材との間に挟む、該第１の部材よりも低い熱伝導率を有するシート状の第３の部材とを備え、
    　前記突起の、前記第１の貫通孔および前記第２の貫通孔を貫通した部分の熱変形もしくは該部分へのオーバーモールドにより、前記第２の部材が前記第１の部材に固定されていることを特徴とする固定構造。
  2. 　前記第２の貫通孔が、前記第１の貫通孔よりも小径の貫通孔であることを特徴とする請求項１に記載の固定構造。
  3. 　前記第１の部材が樹脂材料からなる部材であり、前記第２の部材が金属材料からなる部材であって、前記突起の熱かしめにより、該第２の部材が該第１の部材に固定されていることを特徴とする請求項１または２に記載の固定構造。
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