JP4846523B2 - Bolt fastening structure - Google Patents

Bolt fastening structure Download PDF

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JP4846523B2
JP4846523B2 JP2006291253A JP2006291253A JP4846523B2 JP 4846523 B2 JP4846523 B2 JP 4846523B2 JP 2006291253 A JP2006291253 A JP 2006291253A JP 2006291253 A JP2006291253 A JP 2006291253A JP 4846523 B2 JP4846523 B2 JP 4846523B2
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bolt
insulating washer
fastening structure
magnesium alloy
alloy
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JP2008106868A (en
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明義 杉本
典子 鈴木
境 八木
弘光 奈良間
秀晴 内藤
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Honda Motor Co Ltd
Yazaki Corp
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Honda Motor Co Ltd
Yazaki Corp
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Description

本発明は、マグネシウム合金で構成された第１の部材と金属で構成された第２の部材とをボルトで締結するボルト締結構造に関する。   The present invention relates to a bolt fastening structure for fastening a first member made of a magnesium alloy and a second member made of a metal with a bolt.

移動体としての自動車は、近年、更なる燃費の向上が求められるようになってきている。このような更なる燃費の向上に対応するために、自動車の車体自体の軽量化が求められて、実用金属の中で最も軽いマグネシウム合金で構成された部品を車体に取り付けることが多くなってきている。   In recent years, automobiles as moving bodies have been required to further improve fuel efficiency. In order to cope with such further improvement in fuel consumption, weight reduction of the automobile body itself is required, and parts made of the lightest magnesium alloy among practical metals are often attached to the vehicle body. Yes.

一方、マグネシウム合金が電位的に最も卑であるため、該マグネシウム合金で構成された部品は、異種金属で構成された部品との間に水などが付着すると、該異種金属で構成された部品との間に電位差が生じて、電流が流れる。そして、マグネシウム合金で構成された部品は、所謂電食と称する腐食が発生する。この種の腐食を防止するために、マグネシウム合金で構成された部品を固定する従来から種々のボルト締結構造（例えば、特許文献１参照）が用いられてきた。   On the other hand, since the magnesium alloy is the most basic in terms of potential, when water or the like adheres between the parts made of the magnesium alloy and the parts made of the dissimilar metal, A potential difference is generated between them, and current flows. And the component comprised with a magnesium alloy generate | occur | produces corrosion called what is called electric corrosion. In order to prevent this kind of corrosion, various bolt fastening structures (for example, refer to Patent Document 1) for fixing parts made of a magnesium alloy have been used.

特許文献１に示されたボルト締結構造は、マグネシウム合金又は他の金属で構成された部材に、マグネシウム合金で構成された部品を重ねて、少なくとも外表面が絶縁材料で構成された絶縁ワッシャ内を通った鋼などで構成されたボルトを、前述したマグネシウム合金で構成された部品とマグネシウム合金又は他の金属で構成された部材とにねじ込んで、これらの部品と部材とを固定してきた。
特開２００２−１８８６１６号公報 In the bolt fastening structure disclosed in Patent Document 1, a component made of a magnesium alloy is stacked on a member made of a magnesium alloy or other metal, and at least inside the insulating washer whose outer surface is made of an insulating material. Bolts made of threaded steel or the like have been screwed into the parts made of the magnesium alloy and members made of magnesium alloy or other metals, and these parts and members have been fixed.
JP 2002-188616 A

しかしながら、前述した特許文献１に示されたボルト締結構造では、前述した部品の外表面が平坦に形成されているので、該部品と前記絶縁ワッシャと前記ボルトのボルト頭との近傍に水などの液体が溜まり易かった。前述した部品の外表面が平坦に形成されているので、前記部品と前記ボルトのボルト頭との近傍に溜まった前述した水などの液体が、ボルトと前述した部品との双方に同時に付着してしまう。このため、従来のボルト締結構造は、マグネシウム合金で構成された部品とボルトとの間に電位差が生じて、マグネシウム合金で構成された部品が電食してしまうことがあった。   However, in the bolt fastening structure shown in Patent Document 1 described above, since the outer surface of the above-described component is formed flat, water or the like is present in the vicinity of the component, the insulating washer, and the bolt head of the bolt. The liquid was easy to accumulate. Since the outer surface of the component described above is formed flat, the liquid such as the water accumulated in the vicinity of the component and the bolt head of the bolt adheres to both the bolt and the component described above at the same time. End up. For this reason, in the conventional bolt fastening structure, a potential difference is generated between a component composed of a magnesium alloy and the bolt, and the component composed of the magnesium alloy may be eroded.

したがって、本発明の目的は、水などの液体が付着してもマグネシウム合金で構成された部材が腐食されてしまうことを抑制できるボルト締結構造を提供することにある。   Therefore, an object of the present invention is to provide a bolt fastening structure capable of suppressing corrosion of a member made of a magnesium alloy even when a liquid such as water adheres.

前記課題を解決し目的を達成するために、請求項１に記載の本発明のボルト締結構造は、マグネシウム合金で構成された第１の部材と金属で構成された第２の部材とを、ボルト頭が前記第１の部材上に重ねられるボルトで固定するボルト締結構造において、前記第１の部材と前記第２の部材とには、それぞれ、前記ボルトがねじ込まれるねじ孔が設けられており、前記ボルトのボルト頭と前記第１の部材との間には、内側に前記ボルトのボルト軸部を通しかつ少なくとも外表面が絶縁材料で構成されているとともに当該ボルトのボルト頭よりも平面形の大きな絶縁ワッシャが設けられ、前記第１の部材には、前記第２の部材に重ねられる本体部と、前記ねじ孔が形成されているとともに前記本体部から立設した立設部と、が設けられており、かつ、前記立設部の断面形よりも前記絶縁ワッシャの平面形が大きく形成されている、ことを特徴としている。 In order to solve the problems and achieve the object, the bolt fastening structure of the present invention according to claim 1 includes a first member made of magnesium alloy and a second member made of metal as a bolt. In the bolt fastening structure in which the head is fixed by a bolt that is overlaid on the first member, each of the first member and the second member is provided with a screw hole into which the bolt is screwed. Between the bolt head of the bolt and the first member, the bolt shaft portion of the bolt is passed inside and at least the outer surface is made of an insulating material and is more planar than the bolt head of the bolt. A large insulating washer is provided, and the first member is provided with a main body portion that is overlapped with the second member, and a standing portion that is provided with the screw hole and is erected from the main body portion. It is and, One, the plane form of said insulating washer than the cross-section shape of the erected portion is larger, it is characterized in that.

請求項２に記載の本発明のボルト締結構造は、請求項１記載のボルト締結構造において、前記絶縁ワッシャの内周面には、弾性を有する樹脂で構成されたシール部材が取り付けられていることを特徴としている。   A bolt fastening structure according to a second aspect of the present invention is the bolt fastening structure according to the first aspect, wherein a sealing member made of an elastic resin is attached to the inner peripheral surface of the insulating washer. It is characterized by.

請求項１に記載した本発明のボルト締結構造によれば、マグネシウム合金で構成された第１の部材に本体部から立設してボルトがねじ込まれるねじ孔が形成された立設部を設けている。このため、第１の部材のボルトがねじ込まれる部分が、他の部分（本体部）よりも突出した格好となっている。   According to the bolt fastening structure of the present invention as set forth in claim 1, the first member made of magnesium alloy is provided with the standing portion in which the screw hole is formed so that the bolt is screwed up from the main body portion. Yes. For this reason, the part in which the bolt of the 1st member is screwed becomes the appearance which protruded rather than other parts (main part).

このため、ボルトのボルト頭と絶縁ワッシャとの近傍に水などの液体が付着しても、該付着した水などの液体が速やかに本体部に向かって流れるか、絶縁ワッシャ上に位置付けられる。このため、水などの液体がボルトと第１の部材との双方に同時に付着することを防止できるとともに、ボルトのボルト頭と絶縁ワッシャとの間などからねじ孔内に浸入することを防止できる。   For this reason, even if a liquid such as water adheres to the vicinity of the bolt head of the bolt and the insulating washer, the adhering liquid such as water immediately flows toward the main body or is positioned on the insulating washer. Therefore, it is possible to prevent liquid such as water from adhering to both the bolt and the first member at the same time, and to prevent the liquid from entering the screw hole from between the bolt head of the bolt and the insulating washer.

また、ボルトのボルト頭とマグネシウム合金で構成された第１の部材との間に該ボルトのボルト頭よりも大きな絶縁ワッシャを設けている。このため、絶縁ワッシャとボルトのボルト頭との近傍に付着した水が第１の部材にも付着することを防止できる。   Further, an insulating washer larger than the bolt head of the bolt is provided between the bolt head of the bolt and the first member made of a magnesium alloy. For this reason, it can prevent that the water adhering to the vicinity of the insulation washer and the bolt head of a bolt adheres also to a 1st member.

さらに、第１の部材の立設部の断面形よりも絶縁ワッシャの平面形が大きく形成されているので、該絶縁ワッシャの全周にわたって、該絶縁ワッシャの外縁が第１の部材の立設部よりも外方向に突出する。このため、本体部に向かって流れた水などの液体が立設部の根元などに付着することを防止できる。Further, since the planar shape of the insulating washer is formed larger than the cross-sectional shape of the standing portion of the first member, the outer edge of the insulating washer extends around the entire periphery of the insulating washer. Projecting outward. For this reason, it can prevent that liquids, such as water which flowed toward the main-body part, adhere to the root of a standing part, etc.

請求項２に記載した本発明のボルト締結構造によれば、絶縁ワッシャの内周面にシール部材が設けられているので、ねじ孔内に水などの液体が浸入することをより確実に防止できる。According to the bolt fastening structure of the present invention described in claim 2, since the seal member is provided on the inner peripheral surface of the insulating washer, it is possible to more reliably prevent liquid such as water from entering the screw hole. .

以上説明したように請求項１に記載の本発明は、ねじ孔内に水などの液体が浸入することを防止できるので、水などの液体が付着してもマグネシウム合金で構成された第１の部材が腐食されてしまうことを抑制することができる。   As described above, according to the first aspect of the present invention, since liquid such as water can be prevented from entering the screw hole, the first alloy composed of the magnesium alloy even if liquid such as water adheres. It can suppress that a member is corroded.

また、ボルトのボルト頭とマグネシウム合金で構成された第１の部材とに亘って、水などの液体が付着することを防止できるので、マグネシウム合金で構成された第１の部材が腐食されてしまうことを抑制することができる。   Moreover, since it can prevent that liquids, such as water, adhere over the bolt head and the 1st member comprised with the magnesium alloy, the 1st member comprised with the magnesium alloy will be corroded. This can be suppressed.

さらに、水などの液体が立設部の根元などに付着することを防止できるので、立設部のねじ孔の内周面と立設部の外表面との距離が狭くても、本体部に水などの液体が付着しても、ボルトと第１の部材との間を電荷が移動しにくくなって、マグネシウム合金で構成された第１の部材が腐食されてしまうことをより確実に抑制することができる。Furthermore, since liquid such as water can be prevented from adhering to the base of the standing portion, even if the distance between the inner peripheral surface of the screw hole of the standing portion and the outer surface of the standing portion is small, Even if liquid such as water adheres, it is more reliably suppressed that the electric charge hardly moves between the bolt and the first member and the first member made of the magnesium alloy is corroded. be able to.

請求項２に記載の本発明は、ねじ孔内に水などの液体が浸入することを確実に防止できるので、水などの液体が付着してもマグネシウム合金で構成された第１の部材が腐食されてしまうことを確実に抑制することができる。According to the second aspect of the present invention, since the liquid such as water can be surely prevented from entering the screw hole, the first member made of the magnesium alloy is corroded even if the liquid such as water adheres. It can suppress reliably that it will be done.

以下、本発明の一実施形態にかかるボルト締結構造（以下、単に締結構造と記す）を、図１乃至図４に基づいて説明する。本実施形態にかかる締結構造１は、図１に示す第２の部材としての自動車のボディパネル２に、第１の部材としてのマグネシウム合金部材３（以下、単に合金部材と記す）を固定する構造である。   A bolt fastening structure (hereinafter simply referred to as a fastening structure) according to an embodiment of the present invention will be described below with reference to FIGS. A fastening structure 1 according to the present embodiment is a structure in which a magnesium alloy member 3 (hereinafter simply referred to as an alloy member) as a first member is fixed to a body panel 2 of an automobile as a second member shown in FIG. It is.

ボディパネル２は、例えば、鋼などの金属で構成されている。ボディパネル２の合金部材３が固定される箇所は、その表面が平坦に形成されている。   The body panel 2 is made of a metal such as steel, for example. A portion of the body panel 2 where the alloy member 3 is fixed has a flat surface.

締結構造１は、図１及び図２に示すように、前述した合金部材３と、合金部材３とボディパネル２との各々に設けられたねじ孔４，５（図２に示す）と、ボルト６と、絶縁ワッシャ７と、シール部材８とを備えている。   As shown in FIGS. 1 and 2, the fastening structure 1 includes the above-described alloy member 3, screw holes 4 and 5 (shown in FIG. 2) provided in each of the alloy member 3 and the body panel 2, bolts, and the like. 6, an insulating washer 7, and a seal member 8.

合金部材３は、マグネシウム合金で構成されている。合金部材３は、平板状の本体部９と、本体部９から立設した立設部１０とを一体に備えている。本体部９は、ボディパネル２に重ねられる。立設部１０は、円柱状に形成されている。立設部１０は、ボディパネル２に本体部９が重ねられると、これらのボディパネル２及び本体部９から鉛直方向に沿って上方に向かって立設した格好となる。   The alloy member 3 is made of a magnesium alloy. The alloy member 3 is integrally provided with a flat plate-like main body portion 9 and a standing portion 10 erected from the main body portion 9. The main body 9 is overlaid on the body panel 2. The standing portion 10 is formed in a columnar shape. When the main body 9 is overlapped on the body panel 2, the upright portion 10 looks up from the body panel 2 and the main body 9 along the vertical direction.

ねじ孔４は、合金部材３の立設部１０と本体部９とに亘って設けられ、かつこれらの立設部１０と本体部９との双方即ち合金部材３を貫通している。即ち、立設部１０には、ねじ孔４が形成されている。ねじ孔４は、立設部１０と同軸に配置されている。ねじ孔５は、ボディパネル２に設けられている。ねじ孔４，５は、ボディパネル２に合金部材３の本体部９が重ねられると、互いに連通する。互いに連通したねじ孔４，５には、ボルト６がねじ込まれる（螺合する）。   The screw hole 4 is provided across the standing portion 10 and the main body portion 9 of the alloy member 3, and penetrates both the standing portion 10 and the main body portion 9, that is, the alloy member 3. That is, the screw hole 4 is formed in the standing portion 10. The screw hole 4 is arranged coaxially with the standing portion 10. The screw hole 5 is provided in the body panel 2. The screw holes 4 and 5 communicate with each other when the body portion 9 of the alloy member 3 is superimposed on the body panel 2. Bolts 6 are screwed into (threaded into) the screw holes 4 and 5 communicated with each other.

ボルト６は、鋼などのマグネシウム合金とは異なる金属で構成されている。ボルト６は、円柱状に形成されかつ外周面にねじ溝が形成されたボルト軸部１１と、ボルト軸部１１の端に連なったボルト頭１２とを一体に備えている。ボルト軸部１１とボルト頭１２とは、互いに同軸に配置されている。   The bolt 6 is made of a metal different from a magnesium alloy such as steel. The bolt 6 is integrally provided with a bolt shaft portion 11 formed in a columnar shape and having a thread groove formed on the outer peripheral surface thereof, and a bolt head 12 connected to the end of the bolt shaft portion 11. The bolt shaft portion 11 and the bolt head 12 are arranged coaxially with each other.

ボルト頭１２は、ボルト軸部１１よりも該ボルト軸部１１の外周に突出している。ボルト頭１２は、ボルト軸部１１の端に連なった座部１３と、六角柱状に形成されかつ座部１３に連なった頭部１４とを備えている。座部１３は、薄手の円板状となっている。座部１３が、頭部１４よりもボルト頭１２の外周方向に突出している。座部１３の外径Ｒ１は、ボルト頭１２の外径となっている。また、座部１３の外径Ｒ１は、立設部１０の外径Ｒ２よりも小さい。このため、座部１３は、ボルト軸部１１がねじ孔４，５にねじ込まれると、その全周に亘って外縁部が立設部１０より外周側に突出しない。   The bolt head 12 protrudes from the bolt shaft portion 11 to the outer periphery of the bolt shaft portion 11. The bolt head 12 includes a seat portion 13 connected to the end of the bolt shaft portion 11 and a head portion 14 formed in a hexagonal column shape and connected to the seat portion 13. The seat 13 has a thin disk shape. The seat 13 protrudes from the head 14 in the outer peripheral direction of the bolt head 12. The outer diameter R <b> 1 of the seat portion 13 is the outer diameter of the bolt head 12. Further, the outer diameter R1 of the seat portion 13 is smaller than the outer diameter R2 of the standing portion 10. For this reason, when the bolt shaft portion 11 is screwed into the screw holes 4 and 5, the outer edge portion of the seat portion 13 does not protrude from the standing portion 10 to the outer peripheral side.

ボルト６は、勿論、ボルト頭１２が立設部１０上に重なってボルト軸部１１がねじ孔４，５にねじ込まれる（螺合する）。そして、ボルト６は、ねじ孔４，５にねじ込まれる（螺合する）ことで、ボディパネル２と合金部材３とを固定する。   Of course, the bolt head 12 overlaps with the upright portion 10 and the bolt shaft portion 11 is screwed into (threaded into) the screw holes 4 and 5. The bolt 6 is screwed into (threaded into) the screw holes 4 and 5 to fix the body panel 2 and the alloy member 3.

絶縁ワッシャ７は、円環状に形成されている。絶縁ワッシャ７は、図３及び図４に示すように、鋼などの鉄で構成された円環状の心材１５と、該心材１５の外表面全体にカチオン電着塗装が施されて絶縁材料としてのカチオン電着塗料が付着して形成された絶縁層１６とを備えている。絶縁ワッシャ７は、外表面全体に絶縁材料としてのカチオン電着塗料が付着して絶縁層１６が形成されていることで、その少なくとも外表面の全体が絶縁材料で構成されている。   The insulating washer 7 is formed in an annular shape. As shown in FIG. 3 and FIG. 4, the insulating washer 7 has an annular core 15 made of iron such as steel, and cation electrodeposition coating is applied to the entire outer surface of the core 15 to provide an insulating material. And an insulating layer 16 formed by adhering a cationic electrodeposition paint. The insulating washer 7 has a cationic electrodeposition coating material as an insulating material adhered to the entire outer surface to form an insulating layer 16, so that at least the entire outer surface is made of an insulating material.

絶縁ワッシャ７の内径ｒは、ボルト６のボルト軸部１１の外径よりも大きい。絶縁ワッシャ７の外径Ｒは、ボルト６のボルト頭１２の座部１３の外径Ｒ１と立設部１０の外径Ｒ２との双方よりも大きい。このように、絶縁ワッシャ７は、その外径Ｒがボルト頭１２の座部１３の外径Ｒ１よりも大きく形成されることで、図１に示すように、その平面形がボルト６のボルト頭１２の平面形よりも大きく形成されている。   The inner diameter r of the insulating washer 7 is larger than the outer diameter of the bolt shaft portion 11 of the bolt 6. The outer diameter R of the insulating washer 7 is larger than both the outer diameter R1 of the seat portion 13 of the bolt head 12 of the bolt 6 and the outer diameter R2 of the standing portion 10. As described above, the insulating washer 7 is formed so that its outer diameter R is larger than the outer diameter R1 of the seat portion 13 of the bolt head 12, so that the planar shape of the insulating washer 7 is the bolt head of the bolt 6 as shown in FIG. It is formed larger than 12 plane shapes.

また、絶縁ワッシャ７は、その外径Ｒが立設部１０の外径Ｒ２よりも大きく形成されることで、図１に示すように、その平面形がねじ孔４の長手方向に対して直交する方向の立設部１０の断面形よりも大きく形成されている。絶縁ワッシャ７は、内側にボルト軸部１１を通した状態で、立設部１０とボルト６のボルト頭１２との間に配置される。絶縁ワッシャ７は、立設部１０即ち合金部材３とボルト頭１２即ちボルト６とを電気的に絶縁する。絶縁ワッシャ７は、立設部１０とボルト頭１２との間に配置されると、全周に亘って、該絶縁ワッシャ７の外縁が合金部材３の立設部１０よりも外周側に突出する。   Further, the insulating washer 7 is formed such that its outer diameter R is larger than the outer diameter R2 of the erected portion 10, so that its planar shape is orthogonal to the longitudinal direction of the screw hole 4, as shown in FIG. It is formed larger than the cross-sectional shape of the upright portion 10 in the direction in which it extends. The insulating washer 7 is disposed between the upright portion 10 and the bolt head 12 of the bolt 6 with the bolt shaft portion 11 passing inside. The insulating washer 7 electrically insulates the upright portion 10, that is, the alloy member 3, and the bolt head 12, that is, the bolt 6. When the insulating washer 7 is disposed between the standing portion 10 and the bolt head 12, the outer edge of the insulating washer 7 protrudes more outward than the standing portion 10 of the alloy member 3 over the entire circumference. .

シール部材８は、ゴムなどの弾性を有する樹脂で構成されている、シール部材８は、図３及び図４に示すように、絶縁ワッシャ７の内周面の全周に亘って、該絶縁ワッシャ７の内周面に取り付けられている。シール部材８の厚みは、絶縁ワッシャ７の周方向に均一に形成されている。シール部材８は、弾性変形していない中立状態でその内径がボルト６のボルト軸部１１の外径よりも若干小さく形成されている。   The sealing member 8 is made of an elastic resin such as rubber. The sealing member 8 is formed over the entire circumference of the inner peripheral surface of the insulating washer 7 as shown in FIGS. 3 and 4. 7 is attached to the inner peripheral surface. The thickness of the seal member 8 is uniformly formed in the circumferential direction of the insulating washer 7. The seal member 8 is formed in a neutral state that is not elastically deformed, and has an inner diameter slightly smaller than the outer diameter of the bolt shaft portion 11 of the bolt 6.

シール部材８は、絶縁ワッシャ７内にボルト軸部１１が通されると、該ボルト軸部１１から押圧されて内径が縮小する方向に弾性変形する。そして、シール部材８は、絶縁ワッシャ７の内周面とボルト軸部１１との間を水密に保って、ねじ孔４，５内水などの液体が浸入することを規制する。   When the bolt shaft 11 is passed through the insulating washer 7, the seal member 8 is pressed from the bolt shaft 11 and elastically deforms in a direction in which the inner diameter decreases. The seal member 8 keeps the space between the inner peripheral surface of the insulating washer 7 and the bolt shaft portion 11 and restricts the infiltration of liquid such as water in the screw holes 4 and 5.

前述した締結構造１は、以下のように組み立てられる。ねじ孔４，５が互いに連通するように、ボディパネル２に合金部材３の本体部９を重ねる。そして、合金部材３の立設部１０上に絶縁ワッシャ７を重ねて、該絶縁ワッシャ７内にボルト６のボルト軸部１１を通す。その後、ボルト軸部１１をねじ孔４，５にねじ込む（螺合する）。こうして、ボディパネル２と合金部材３とを固定して、前述した構造の締結構造１を組み立てる。   The fastening structure 1 described above is assembled as follows. The body portion 9 of the alloy member 3 is overlaid on the body panel 2 so that the screw holes 4 and 5 communicate with each other. Then, the insulating washer 7 is overlapped on the standing portion 10 of the alloy member 3, and the bolt shaft portion 11 of the bolt 6 is passed through the insulating washer 7. Thereafter, the bolt shaft portion 11 is screwed into (threaded into) the screw holes 4 and 5. Thus, the body panel 2 and the alloy member 3 are fixed, and the fastening structure 1 having the above-described structure is assembled.

本実施形態によれば、マグネシウム合金で構成された合金部材３に本体部９から立設してボルト６がねじ込まれるねじ孔４が形成された立設部１０を設けている。このため、合金部材３のボルト６がねじ込まれる部分（立設部１０）が、他の部分（本体部９）よりも突出した格好となっている。   According to the present embodiment, the standing portion 10 is provided with the screw hole 4 into which the bolt 6 is screwed by being erected from the body portion 9 on the alloy member 3 made of magnesium alloy. For this reason, the part (standing part 10) into which the bolt 6 of the alloy member 3 is screwed becomes a shape protruding from the other part (main body part 9).

このため、ボルト６のボルト頭１２と絶縁ワッシャ７との近傍に水などの液体が付着しても、該付着した水などの液体が速やかに、本体部９に向かって流れるか、図２中一点鎖線で示す絶縁ワッシャ７上に位置付けられる。このため、水などの液体がボルト６と合金部材３との双方に同時に付着することを防止できるとともに、水などの液体がボルト６のボルト頭１２と絶縁ワッシャ７との間などからねじ孔４，５内に浸入することを防止できる。したがって、締結構造１は、水などの液体が付着してもマグネシウム合金で構成された合金部材３が腐食されてしまうことを抑制することができる。   For this reason, even if a liquid such as water adheres to the vicinity of the bolt head 12 of the bolt 6 and the insulating washer 7, the adhering liquid such as water immediately flows toward the main body 9 or is shown in FIG. It is positioned on an insulating washer 7 indicated by a one-dot chain line. For this reason, it is possible to prevent a liquid such as water from adhering to both the bolt 6 and the alloy member 3 at the same time, and a liquid such as water from between the bolt head 12 of the bolt 6 and the insulating washer 7 to the screw hole 4. , 5 can be prevented from entering. Therefore, the fastening structure 1 can suppress corrosion of the alloy member 3 made of a magnesium alloy even when a liquid such as water adheres.

また、ボルト６のボルト頭１２とマグネシウム合金で構成された合金部材３との間に該ボルト６のボルト頭１２よりも大きな絶縁ワッシャ７を設けている。このため、絶縁ワッシャ７とボルト６のボルト頭１２との近傍に付着した水が合金部材３にも付着することを防止できる。したがって、マグネシウム合金で構成された合金部材３が腐食されてしまうことを抑制することができる。   Further, an insulating washer 7 larger than the bolt head 12 of the bolt 6 is provided between the bolt head 12 of the bolt 6 and the alloy member 3 made of a magnesium alloy. For this reason, it is possible to prevent water adhering to the vicinity of the insulating washer 7 and the bolt head 12 of the bolt 6 from adhering to the alloy member 3 as well. Therefore, it can suppress that the alloy member 3 comprised with the magnesium alloy will be corroded.

絶縁ワッシャ７の内周面にシール部材８が設けられているので、ねじ孔４，５内に水などの液体が浸入することをより確実に防止できる。したがって、締結構造１は、水などの液体が付着してもマグネシウム合金で構成された合金部材３が腐食されてしまうことを確実に抑制することができる。   Since the sealing member 8 is provided on the inner peripheral surface of the insulating washer 7, it is possible to more reliably prevent liquid such as water from entering the screw holes 4 and 5. Therefore, even if liquid, such as water, adheres, fastening structure 1 can control certainly that alloy member 3 constituted with a magnesium alloy will be corroded.

合金部材３の立設部１０の断面形よりも絶縁ワッシャ７の平面形が大きく形成されているので、該絶縁ワッシャ７の全周にわたって、該絶縁ワッシャ７の外縁が合金部材３の立設部１０よりも外方向に突出する。本体部９に向かって流れた水などの液体が立設部１０の根元（図２中に二点鎖線で示し、立設部１０の本体部９よりの端部の近傍を示す）などに付着することを防止できる。このため、立設部１０のねじ孔 の内周面と立設部１０の外表面との距離Ｌが狭くても、ボルト６と合金部材３との間を合金部材３に付着した水などの液体を通して電荷が移動しにくくなって、マグネシウム合金で構成された合金部材３が腐食されてしまうことをより確実に抑制することができる。   Since the planar shape of the insulating washer 7 is formed larger than the cross-sectional shape of the standing portion 10 of the alloy member 3, the outer edge of the insulating washer 7 extends over the entire circumference of the insulating washer 7. It protrudes outward from 10. A liquid such as water that flows toward the main body 9 adheres to the root of the standing portion 10 (indicated by a two-dot chain line in FIG. 2 and indicates the vicinity of the end of the standing portion 10 from the main body 9). Can be prevented. For this reason, even if the distance L between the inner peripheral surface of the screw hole of the erected portion 10 and the outer surface of the erected portion 10 is small, water adhered to the alloy member 3 between the bolt 6 and the alloy member 3 or the like. It is possible to more reliably prevent the alloy member 3 made of a magnesium alloy from being corroded because the electric charge is difficult to move through the liquid.

本実施形態では、第２の部材としてのボディパネル２を鋼で構成したが、本発明では、第２の部材をマグネシウム合金で構成しても良い。要するに、本発明では、第２の部材を種々の金属で構成すればよい。   In the present embodiment, the body panel 2 as the second member is made of steel. However, in the present invention, the second member may be made of a magnesium alloy. In short, in the present invention, the second member may be made of various metals.

また、前述した実施形態では、絶縁ワッシャ７の心材１５を鋼などで形成し、該心材１５の外表面全体に絶縁層１６を形成している。しかしながら、本発明では、絶縁ワッシャ７の心材１５をアルミニウム合金で構成して、絶縁層１６を陽極酸化によって形成しても良い。また、本発明では、絶縁ワッシャ７全体を絶縁材料で構成しても良い。要するに、本発明では、種々の手段を用いて、絶縁ワッシャ７の少なくとも外表面を絶縁材料で構成すれば良い。   In the embodiment described above, the core material 15 of the insulating washer 7 is formed of steel or the like, and the insulating layer 16 is formed on the entire outer surface of the core material 15. However, in the present invention, the core 15 of the insulating washer 7 may be made of an aluminum alloy, and the insulating layer 16 may be formed by anodic oxidation. In the present invention, the entire insulating washer 7 may be made of an insulating material. In short, in the present invention, at least the outer surface of the insulating washer 7 may be made of an insulating material using various means.

また、本発明では、ボディパネル２、合金部材３即ち立設部１０や絶縁ワッシャ７を、実施形態に記載した形状に限定することなく、種々の形状に形成しても良い。要するに、本発明では、ボルト頭１２の外縁より絶縁ワッシャ７の外縁を全周に亘って外周に位置付けておけばよいとともに、立設部１０の外縁より絶縁ワッシャ７の外縁を全周に亘って外周に位置付けておけばよい。   Moreover, in this invention, you may form the body panel 2, the alloy member 3, ie, the standing part 10, and the insulation washer 7, in various shapes, without limiting to the shape described in embodiment. In short, in the present invention, the outer edge of the insulating washer 7 may be positioned over the entire circumference from the outer edge of the bolt head 12, and the outer edge of the insulating washer 7 may be disposed over the entire circumference from the outer edge of the standing portion 10. It only has to be positioned on the outer periphery.

なお、前述した実施形態は本発明の代表的な形態を示したに過ぎず、本発明は、実施形態に限定されるものではない。即ち、本発明の骨子を逸脱しない範囲で種々変形して実施することができる。   In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

本発明の一実施形態に係る締結構造の平面図である。It is a top view of the conclusion structure concerning one embodiment of the present invention. 図１中のＩＩ−ＩＩ線に沿う断面図である。It is sectional drawing which follows the II-II line | wire in FIG. 図２に示された締結構造の絶縁ワッシャの断面図である。FIG. 3 is a cross-sectional view of an insulating washer having a fastening structure shown in FIG. 2. 図３に示された絶縁ワッシャ内にボルトのボルト軸部を通した状態を示す断面図である。It is sectional drawing which shows the state which passed the volt | bolt axial part of the volt | bolt in the insulation washer shown by FIG.

符号の説明Explanation of symbols

１ ボルト締結構造
２ ボディパネル（第２の部材）
３ マグネシウム合金部材（第１の部材）
４，５ ねじ孔
６ ボルト
７ 絶縁ワッシャ
８ シール部材
９ 本体部
１０ 立設部
１１ ボルト軸部
１２ ボルト頭 1 Bolt fastening structure 2 Body panel (second member)
3 Magnesium alloy member (first member)
4,5 Screw hole 6 Bolt 7 Insulating washer 8 Seal member 9 Body portion 10 Standing portion 11 Bolt shaft portion 12 Bolt head

Claims (2)

マグネシウム合金で構成された第１の部材と金属で構成された第２の部材とを、ボルト頭が前記第１の部材上に重ねられるボルトで固定するボルト締結構造において、
前記第１の部材と前記第２の部材とには、それぞれ、前記ボルトがねじ込まれるねじ孔が設けられており、
前記ボルトのボルト頭と前記第１の部材との間には、内側に前記ボルトのボルト軸部を通しかつ少なくとも外表面が絶縁材料で構成されているとともに当該ボルトのボルト頭よりも平面形の大きな絶縁ワッシャが設けられ、
前記第１の部材には、前記第２の部材に重ねられる本体部と、前記ねじ孔が形成されているとともに前記本体部から立設した立設部と、が設けられており、かつ、前記立設部の断面形よりも前記絶縁ワッシャの平面形が大きく形成されている、ことを特徴とするボルト締結構造。 In a bolt fastening structure in which a first member made of a magnesium alloy and a second member made of a metal are fixed with a bolt with a bolt head superimposed on the first member.
Each of the first member and the second member is provided with a screw hole into which the bolt is screwed.
Between the bolt head of the bolt and the first member, the bolt shaft portion of the bolt is passed inside and at least the outer surface is made of an insulating material and is more planar than the bolt head of the bolt. A large insulating washer is provided,
The first member is provided with a main body portion that is overlapped with the second member, and a standing portion that is formed with the screw hole and is erected from the main body portion , and A bolt fastening structure, wherein a planar shape of the insulating washer is formed larger than a cross-sectional shape of the standing portion . 前記絶縁ワッシャの内周面には、弾性を有する樹脂で構成されたシール部材が取り付けられていることを特徴とする請求項１に記載のボルト締結構造。 The bolt fastening structure according to claim 1 , wherein a sealing member made of an elastic resin is attached to an inner peripheral surface of the insulating washer.
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