JP7274051B2 - fuel tank - Google Patents

fuel tank Download PDF

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Publication number
JP7274051B2
JP7274051B2 JP2022524814A JP2022524814A JP7274051B2 JP 7274051 B2 JP7274051 B2 JP 7274051B2 JP 2022524814 A JP2022524814 A JP 2022524814A JP 2022524814 A JP2022524814 A JP 2022524814A JP 7274051 B2 JP7274051 B2 JP 7274051B2
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built
support
holes
fuel tank
strut
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JPWO2021234921A1 (en
JPWO2021234921A5 (en
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アラン リチティ
マシュー メイプルズ
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Yachiyo Industry Co Ltd
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Yachiyo Industry Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/16—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge constructed of plastics materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0147—Shape complex
    • F17C2201/0157—Polygonal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/056—Small (<1 m3)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/01—Reinforcing or suspension means
    • F17C2203/011—Reinforcing means
    • F17C2203/013—Reinforcing means in the vessel, e.g. columns
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0614—Single wall
    • F17C2203/0621—Single wall with three layers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0658—Synthetics
    • F17C2203/066—Plastics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/068—Special properties of materials for vessel walls
    • F17C2203/0682—Special properties of materials for vessel walls with liquid or gas layer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/22—Assembling processes
    • F17C2209/221—Welding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/01—Improving mechanical properties or manufacturing
    • F17C2260/011—Improving strength
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0165—Applications for fluid transport or storage on the road
    • F17C2270/0168—Applications for fluid transport or storage on the road by vehicles

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Description

本発明は、樹脂製の燃料タンクに関する。 The present invention relates to a resin fuel tank.

樹脂製の燃料タンクとして、タンク本体の内部で対向する壁部同士を内蔵支柱で支える技術が知られている。燃料タンクでは、内圧変動によりタンク本体の壁部が燃料タンクの外側あるいは内側に向けて変形することがある。このとき、内蔵支柱に伸縮性がないと、タンク本体と内蔵支柱との溶着部に応力が集中しやすく、場合によっては溶着部に亀裂が生じるおそれや内蔵支柱が座屈するおそれがある。 BACKGROUND ART As a resin fuel tank, a technique is known in which walls facing each other inside a tank body are supported by built-in struts. In a fuel tank, the wall portion of the tank body may deform toward the outside or inside of the fuel tank due to internal pressure fluctuations. At this time, if the built-in strut has no stretchability, stress tends to concentrate on the welded portion between the tank body and the built-in strut, and in some cases, the welded portion may crack or the built-in strut may buckle.

この問題に対して、特許文献１には、内蔵支柱に、弾性変形を容易とする耳たぶ形状部（ｌｏｂｅ）を設ける技術が記載されている。これによれば、タンク本体の壁部が燃料タンクの外側あるいは内側に向けて変形すると、耳たぶ形状部が撓むことでタンク本体の変形量を吸収する。これにより、溶着部への応力集中が低減される。 To address this problem, Patent Literature 1 describes a technique of providing a built-in strut with an earlobe-shaped portion (lobe) that facilitates elastic deformation. According to this, when the wall portion of the tank body deforms toward the outside or the inside of the fuel tank, the earlobe-shaped portion bends to absorb the amount of deformation of the tank body. This reduces stress concentration on the welded portion.

米国特許第６３３８４２０号公報U.S. Pat. No. 6,338,420

一方、弾性変形の容易な箇所を部分的に設けた場合、支柱としての剛性が不足しやすいという問題があり、伸縮性と剛性とがバランスよく高次元で両立する内蔵支柱が求められる。 On the other hand, there is a problem that the rigidity of the support tends to be insufficient when a part of the support that is easily elastically deformed is provided.

本発明の第１の態様では、樹脂製の燃料タンクであって、内部に対向する壁部を有するタンク本体と、前記対向する壁部に固定される両端部を有する内蔵支柱を備え、前記内蔵支柱は、側面視において互いに隣接するように縦横に配列された複数の貫通孔を有するハニカム構造を有し、伸縮性を備えるように格子状を呈しており、複数の前記貫通孔の軸方向は、当該内蔵支柱の軸方向に対して直交するように形成されている。
In a first aspect of the present invention, a resin fuel tank includes a tank body having walls facing inside, and an internal strut having both ends fixed to the walls facing the walls, wherein the built-in The column has a honeycomb structure having a plurality of through holes arranged vertically and horizontally so as to be adjacent to each other in a side view, and has a lattice shape so as to have elasticity, and the axial direction of the plurality of through holes is , are formed so as to be perpendicular to the axial direction of the built-in strut.

本発明の第１の態様によれば、内蔵支柱は、側面視において互いに隣接するように配列された複数の貫通孔を有するハニカム構造を有し、格子状を呈していることにより、弾性変形の容易な箇所を部分的に設ける場合に比べ、内蔵支柱の剛性が高くなる。タンク本体の内圧変動によりタンク本体の壁部が外側あるいは内側に変形して、内蔵支柱を軸方向に引張あるいは圧縮する力が加わると、格子構造によって、各貫通孔周りが軸方向に撓む。これにより、本発明の内蔵支柱によれば、伸縮性と剛性とがバランスよく確保され、タンク本体と内蔵支柱との溶着部における応力集中が低減される。 According to the first aspect of the present invention, the built-in support has a honeycomb structure having a plurality of through-holes arranged adjacent to each other in a side view, and exhibits a lattice shape, thereby preventing elastic deformation. The rigidity of the built-in strut is increased compared to the case of partially providing an easy portion. When the wall portion of the tank body deforms outward or inward due to internal pressure fluctuation of the tank body, and a force is applied to pull or compress the built-in support in the axial direction, the grid structure causes the circumference of each through hole to bend in the axial direction. As a result, according to the built-in strut of the present invention, stretchability and rigidity are secured in a well-balanced manner, and stress concentration at the welded portion between the tank body and the built-in strut is reduced.

第２の態様では、前記貫通孔は、六角孔、三角孔、又は、円形孔である。 In a second aspect, the through holes are hexagonal holes, triangular holes, or circular holes.

第２の態様によれば、格子形状がハニカム形状となるので、内蔵支柱の高い剛性と良好な伸縮性の両立を図る。 According to the second aspect, since the lattice shape is a honeycomb shape, both high rigidity and good stretchability of the built-in pillars are achieved.

第３の態様では、前記内蔵支柱は、その両端部に前記壁部に溶着する円形状の溶着面部を有して略円柱形状を呈している。 In a third aspect, the built-in support column has a substantially cylindrical shape with circular welding surface portions that are welded to the wall portions at both ends thereof.

第３の態様によれば、内蔵支柱を、その両端部に円形状の溶着面部を有した略円柱形状とすれば、溶着部や内蔵支柱に加わる荷重を軸を中心として均一に分散する。これにより、内蔵支柱への無理な応力集中を低減する。 According to the third aspect, if the built-in support has a substantially cylindrical shape with circular welding surfaces at both ends, the load applied to the welded part and the built-in support is evenly distributed around the axis. This reduces unreasonable stress concentration on the built-in struts.

第４の態様では、前記内蔵支柱は、２つ以上設けられ、隣接する内蔵支柱同士を連結する連結部が設けられている。 In the fourth aspect, two or more of the built-in struts are provided, and a connecting portion that connects adjacent built-in struts is provided.

第４の態様によれば、内蔵支柱同士を連結する連結部を設けることで、万一、一方の内蔵支柱に過分な力が加わった際に、その力を連結部を通して他方の内蔵支柱に分散させる。 According to the fourth aspect, by providing the connecting portion for connecting the internal columns, in the unlikely event that an excessive force is applied to one of the internal columns, the force is distributed to the other internal column through the connecting portion. Let

第５の態様では、前記連結部は、前記内蔵支柱の両端部から離れた位置に設けられている。 In a fifth aspect, the connecting portion is provided at a position away from both end portions of the built-in support.

第５の態様によれば、格子形状によって伸縮性に富んだ部位に連結部が設けられることとなり、連結部への応力集中を低減する。 According to the fifth aspect, the connecting portion is provided at the portion that is highly stretchable due to the lattice shape, thereby reducing stress concentration on the connecting portion.

第６の態様では、前記連結部に、前記貫通孔と同方向に貫通し、前記内蔵支柱の軸方向に並列された複数の連結貫通孔が設けられている。 In the sixth aspect, the connecting portion is provided with a plurality of connecting through-holes that penetrate in the same direction as the through-holes and are arranged in parallel in the axial direction of the built-in support.

第６の態様によれば、連結部自体の伸縮性を確保でき、内蔵支柱の伸縮動作に合わせて連結部を伸縮させる。これにより、連結部への応力集中を一層低減する。 According to the sixth aspect, the stretchability of the connecting portion itself can be ensured, and the connecting portion is expanded and contracted according to the expansion and contraction of the built-in support. This further reduces the stress concentration on the connecting portion.

本発明によれば、タンク本体が変形した際のタンク本体と内蔵支柱との溶着部への応力集中を低減するにあたり、内蔵支柱に伸縮性と剛性とをバランスよく確保する。 According to the present invention, in order to reduce stress concentration on the welded portion between the tank body and the built-in support when the tank body is deformed, the built-in support is provided with a good balance of stretchability and rigidity.

本発明に係る燃料タンクの側断面図である。1 is a side sectional view of a fuel tank according to the present invention; FIG. 第１実施形態に係る内蔵支柱の側面図である。It is a side view of the built-in support|pillar which concerns on 1st Embodiment. 第１実施形態に係る内蔵支柱の外観斜視図である。It is an external appearance perspective view of the built-in support|pillar which concerns on 1st Embodiment. 第２実施形態に係る内蔵支柱の側面図である。It is a side view of the built-in support|pillar which concerns on 2nd Embodiment. 第２実施形態に係る内蔵支柱の外観斜視図である。It is an external appearance perspective view of the built-in support|pillar which concerns on 2nd Embodiment. 貫通孔が円形孔である内蔵支柱の側面図である。FIG. 4 is a side view of the built-in strut having circular through-holes; 貫通孔が三角孔である内蔵支柱の側面図である。FIG. 4 is a side view of the built-in pillar with triangular through holes.

図１に示すように、燃料タンク１は、樹脂製のタンク本体２の内部で対向する壁部２Ａ，２Ｂに両端部がそれぞれ固定される内蔵支柱３を備えている。タンク本体２の層構造は、例えば燃料の不透過性に優れた材質からなるバリア層を、タンク内面を形成する内側熱可塑性樹脂層と、タンク外面を形成する外側熱可塑性樹脂層とで挟んだ多層断面構造からなる。内側熱可塑性樹脂層および外側熱可塑性樹脂層の材質は、例えば熱溶融性や成形性に優れるＰＥ（高密度ポリエチレン）である。内蔵支柱３の両端部は、壁部２Ａ，２Ｂの内側熱可塑性樹脂層に熱溶着される。 As shown in FIG. 1, the fuel tank 1 includes a built-in strut 3 whose both ends are fixed to opposing walls 2A and 2B inside a tank body 2 made of resin. The layer structure of the tank body 2 is such that a barrier layer made of, for example, a material that is highly impermeable to fuel is sandwiched between an inner thermoplastic resin layer that forms the inner surface of the tank and an outer thermoplastic resin layer that forms the outer surface of the tank. It consists of a multi-layer cross-sectional structure. The material of the inner thermoplastic resin layer and the outer thermoplastic resin layer is, for example, PE (high-density polyethylene), which has excellent heat-meltability and moldability. Both ends of the built-in support 3 are thermally welded to the inner thermoplastic resin layers of the walls 2A and 2B.

図２、図３も参照して、内蔵支柱３は、側面視（内蔵支柱３の軸Ｏ方向と直交するＰ方向）において複数の貫通孔４が隣接して配列されるように格子状を呈している。また、複数の貫通孔４は、内蔵支柱３の縦断面（軸Ｏ方向及びＰ方向と直交する断面）においても隣接して配列されている。内蔵支柱３を格子形状とすることにより、従来のように伸縮部を部分的に設けた場合に比して、内蔵支柱３の剛性を高める。そして、例えばタンク本体２の内圧変動により壁部２Ａ，２Ｂから、内蔵支柱３を軸Ｏ方向に引張あるいは圧縮する力が加わると、各貫通孔４周りの格子壁部５が軸Ｏ方向に撓む。これにより、内蔵支柱３は、無理な応力集中が生じることなく、軸Ｏ方向に弾性変形する。つまり、本発明の内蔵支柱３によれば、伸縮性と剛性とがバランスよく確保されることになり、タンク本体２と内蔵支柱３との溶着部における応力集中が低減される。また、内蔵支柱３が撓むことで、内蔵支柱３の座屈のおそれも低減される。 2 and 3, the built-in support 3 has a lattice shape in which a plurality of through-holes 4 are arranged adjacent to each other when viewed from the side (direction P orthogonal to the direction of the axis O of the built-in support 3). ing. Also, the plurality of through holes 4 are arranged adjacent to each other in the longitudinal section of the built-in support 3 (the section perpendicular to the directions of the axes O and P). By forming the built-in support 3 into a lattice shape, the rigidity of the built-in support 3 is increased as compared with the conventional case where the expandable part is partially provided. For example, when a force is applied from the walls 2A and 2B to pull or compress the built-in support 3 in the direction of the axis O due to fluctuations in the internal pressure of the tank body 2, the lattice wall 5 around each through-hole 4 bends in the direction of the axis O. nothing. As a result, the built-in support 3 is elastically deformed in the direction of the axis O without excessive stress concentration. That is, according to the built-in strut 3 of the present invention, stretchability and rigidity are ensured in a well-balanced manner, and stress concentration at the welded portion between the tank body 2 and the built-in strut 3 is reduced. In addition, since the built-in support 3 bends, the risk of buckling of the built-in support 3 is reduced.

以下、内蔵支柱３の好適な実施形態を説明する。
第１実施形態
図１ないし図３において、内蔵支柱３は、貫通孔４が設けられる柱中央部６と、柱中央部６の両端にそれぞれ柱端部７を介して形成される溶着面部８と、を備えており、全体として略円柱形状を呈している。内蔵支柱３は、樹脂製であり、柱中央部６と柱端部７と溶着面部８とは一体に成形されている。A preferred embodiment of the built-in strut 3 will be described below.
First Embodiment In FIGS. 1 to 3, the built-in support column 3 includes a column center portion 6 provided with a through hole 4 and welding surface portions 8 formed at both ends of the column center portion 6 via column end portions 7. , and has a substantially cylindrical shape as a whole. The built-in column 3 is made of resin, and the column center portion 6, the column end portion 7, and the welding surface portion 8 are integrally formed.

貫通孔４は、六角孔９からなる。つまり、内蔵支柱３の柱中央部６は、ハニカム構造を有する。六角孔９は、軸Ｏ方向に延びる３列状態で配列されている。隣接する３つの六角孔９の中心同士を結ぶ線が三角形の格子を形成するように、六角孔９は格子状に配置される。六角孔９が正六角形であると、隣接する３つの六角孔９の中心同士を結ぶ線は正三角形の格子を形成する。柱中央部６は、周面寄りの格子壁部５がアコーデオン状の平面１０として形成されているものの、各六角孔９の開口端周りは、図３から判るように、軸Ｏ周りの円周方向に沿って円弧状に形成されていることで、全体として略円柱形状を呈している。 The through hole 4 consists of a hexagonal hole 9 . That is, the column center portion 6 of the built-in column 3 has a honeycomb structure. The hexagonal holes 9 are arranged in three rows extending in the axis O direction. The hexagonal holes 9 are arranged in a grid such that lines connecting the centers of three adjacent hexagonal holes 9 form a triangular grid. If the hexagonal holes 9 are regular hexagons, lines connecting the centers of three adjacent hexagonal holes 9 form a grid of equilateral triangles. In the central portion 6 of the column, the grid wall portion 5 near the peripheral surface is formed as an accordion-shaped flat surface 10, but the opening ends of the hexagonal holes 9, as can be seen from FIG. By being formed in a circular arc shape along the direction, it exhibits a substantially cylindrical shape as a whole.

溶着面部８は、円板形状に形成されている。溶着面部８には、複数の円弧リブ１２が軸Ｏを中心として同心状に形成されている。同一円周線上の円弧リブ１２には、切り込みが複数形成されている。このような円弧リブ１２を設けることにより、熱溶着の際にタンク本体２の樹脂が円弧リブ１２周りに回り込むので、タンク本体２と内蔵支柱３との溶着性が向上する。 The welding surface portion 8 is formed in a disc shape. A plurality of arcuate ribs 12 are formed concentrically around the axis O on the welding surface portion 8 . A plurality of cuts are formed in the arcuate rib 12 on the same circumferential line. By providing such arc ribs 12, the resin of the tank body 2 wraps around the arc ribs 12 at the time of heat welding, so that the weldability between the tank body 2 and the built-in support 3 is improved.

本実施形態によれば、貫通孔４が六角孔９から構成されることで、内蔵支柱３がハニカム構造を有することとなり、内蔵支柱３の高い剛性と良好な伸縮性の両立を図ることができる。内蔵支柱３を、その両端部に円形状の溶着面部８を有した略円柱形状とすれば、溶着部や内蔵支柱３に加わる荷重を軸Ｏを中心として均一に分散する。これにより、内蔵支柱３への無理な応力集中を低減する。 According to the present embodiment, since the through-holes 4 are composed of the hexagonal holes 9, the built-in support 3 has a honeycomb structure, and both high rigidity and good stretchability of the built-in support 3 can be achieved. . If the built-in support 3 has a substantially cylindrical shape with circular welded surfaces 8 at both ends, the load applied to the welded part and the built-in support 3 is evenly distributed around the axis O. This reduces excessive stress concentration on the built-in support 3 .

第２実施形態
第２実施形態では、図４、図５に示すように、２つの内蔵支柱３が連結部１３で連結されている。各内蔵支柱３の構成は第１実施形態と同じであるので、説明は省略する。連結部１３は、内蔵支柱３の両端部から離れた内蔵支柱３の中程の位置、具体的には柱中央部６に設けられている。連結部１３は、各内蔵支柱３の平面１０同士を連結する軸Ｏ方向視で矩形状の板状部から構成されている。この板状部は軸Ｏ方向に間隔を空けて複数設けられている。これにより、連結部１３には、六角孔９と同方向に、つまりＰ方向に貫通し、内蔵支柱３の軸Ｏ方向に並列された複数の六角形状の連結貫通孔１４が設けられる。2nd Embodiment In 2nd Embodiment, as shown in FIG.4 and FIG.5, the two built-in support|pillars 3 are connected with the connection part 13. FIG. Since the configuration of each built-in column 3 is the same as that of the first embodiment, the description is omitted. The connecting portion 13 is provided at a position in the middle of the built-in support 3 away from both end portions of the built-in support 3 , specifically, at the column central portion 6 . The connecting portion 13 is formed of a rectangular plate-like portion as viewed in the direction of the axis O that connects the flat surfaces 10 of the built-in support columns 3 . A plurality of plate-shaped portions are provided at intervals in the direction of the axis O. As shown in FIG. Thus, the connecting portion 13 is provided with a plurality of hexagonal connecting through-holes 14 that penetrate in the same direction as the hexagonal hole 9 , that is, in the P direction and are arranged in parallel in the direction of the axis O of the built-in support 3 .

内蔵支柱３同士を連結する連結部１３を設けることで、万一、一方の内蔵支柱３に過分な力がかかった際に、その力を連結部１３を通して他方の内蔵支柱３に分散させる。連結部１３を内蔵支柱３の両端部から離れた内蔵支柱３の中程の位置に設けることで、格子形状によって伸縮性に富んだ部位に連結部１３が設けられることとなり、連結部１３への応力集中を低減する。また、連結部１３に、六角孔９と同方向に貫通し、内蔵支柱３の軸Ｏ方向に並列された複数の連結貫通孔１４を設けることで、連結部１３自体の伸縮性を確保でき、内蔵支柱３の伸縮動作に合わせて連結部１３を伸縮させる。これにより、連結部１３周りの応力集中を一層低減する。 By providing the connecting part 13 for connecting the built-in struts 3 to each other, when an excessive force is applied to one built-in strut 3, the force is dispersed to the other built-in strut 3 through the connecting part 13. - 特許庁By providing the connecting part 13 at a position in the middle of the built-in support 3 away from both ends of the built-in support 3, the connecting part 13 is provided in a part that is highly elastic due to the lattice shape, and the connection to the connecting part 13 is provided. Reduce stress concentration. In addition, by providing a plurality of connecting through-holes 14 that pass through the connecting portion 13 in the same direction as the hexagonal hole 9 and are arranged in parallel in the direction of the axis O of the built-in support 3, the elasticity of the connecting portion 13 itself can be secured. The connecting part 13 is expanded and contracted according to the expansion and contraction of the built-in support 3 . This further reduces stress concentration around the connecting portion 13 .

以上、本発明の好適な実施形態を説明した。貫通孔４は、六角孔９に限られることなく、格子状に配列されていれば、図６に示す円形孔１５や図７に示す三角孔１６等であってもよい。すなわち、図６に示す形態では、隣接する３つの円形孔１５の中心同士を結ぶ線が正三角形の格子を形成するように、円形孔１５は格子状に配置される。図７に示す形態では、隣接する６つの三角孔１６の中心同士を結ぶ線が六角形の格子を形成するように、三角孔１６は格子状に配置される。また、三角孔１６が正三角形であると、隣接する６つの三角孔１６の中心同士を結ぶ線は正六角形の格子を形成する。
また、第２実施形態において、内蔵支柱３は３つ以上あってもよい。The preferred embodiments of the present invention have been described above. The through holes 4 are not limited to the hexagonal holes 9, and may be circular holes 15 shown in FIG. 6, triangular holes 16 shown in FIG. That is, in the form shown in FIG. 6, the circular holes 15 are arranged in a grid such that lines connecting the centers of three adjacent circular holes 15 form a grid of equilateral triangles. In the form shown in FIG. 7, the triangular holes 16 are arranged in a lattice such that lines connecting the centers of six adjacent triangular holes 16 form a hexagonal lattice. Also, if the triangular holes 16 are equilateral triangles, lines connecting the centers of six adjacent triangular holes 16 form a regular hexagonal lattice.
Further, in the second embodiment, there may be three or more built-in struts 3 .

１ 燃料タンク
２ タンク本体
３ 内蔵支柱
４ 貫通孔
５ 格子壁部
６ 柱中央部
７ 柱端部
８ 溶着面部
９ 六角孔
１３ 連結部
１４ 連結貫通孔
REFERENCE SIGNS LIST 1 fuel tank 2 tank body 3 built-in strut 4 through hole 5 grid wall portion 6 column center portion 7 column end portion 8 welding surface portion 9 hexagonal hole 13 connecting portion 14 connecting through hole

Claims (6)

樹脂製の燃料タンクであって、
内部に対向する壁部を有するタンク本体と、
前記対向する壁部に固定される両端部を有する内蔵支柱を備え、
前記内蔵支柱は、側面視において互いに隣接するように縦横に配列された複数の貫通孔を有するハニカム構造を有し、伸縮性を備えるように格子状を呈しており、
複数の前記貫通孔の軸方向は、当該内蔵支柱の軸方向に対して直交するように形成されている燃料タンク。 A fuel tank made of resin,
a tank body having walls facing the inside;
a built-in post having ends fixed to the opposing walls;
The built-in support has a honeycomb structure having a plurality of through-holes arranged vertically and horizontally so as to be adjacent to each other in a side view, and has a lattice shape so as to be stretchable ,
A fuel tank in which the axial direction of the plurality of through holes is perpendicular to the axial direction of the internal strut. 前記貫通孔は、六角孔、三角孔、又は、円形孔である請求項１に記載の燃料タンク。 2. The fuel tank according to claim 1, wherein said through hole is a hexagonal hole, a triangular hole or a circular hole. 前記内蔵支柱は、その両端部に前記壁部に溶着する円形状の溶着面部を有して略円柱形状を呈している請求項１に記載の燃料タンク。 2. The fuel tank according to claim 1, wherein the built-in support column has a substantially cylindrical shape with circular welding surfaces that are welded to the wall portions at both ends thereof. 前記内蔵支柱は、２つ以上設けられ、隣接する内蔵支柱同士を連結する連結部が設けられている請求項１に記載の燃料タンク。 2. The fuel tank according to claim 1, wherein two or more of said built-in struts are provided, and a connecting portion for connecting adjacent built-in struts is provided. 前記連結部は、前記内蔵支柱の両端部から離れた位置に設けられている請求項４に記載の燃料タンク。 5. The fuel tank according to claim 4, wherein the connecting portion is provided at a position separated from both ends of the built-in strut. 前記連結部に、前記貫通孔と同方向に貫通し、前記内蔵支柱の軸方向に並列された複数の連結貫通孔が設けられている請求項５に記載の燃料タンク。 6. The fuel tank according to claim 5, wherein the connecting portion is provided with a plurality of connecting through-holes extending in the same direction as the through-holes and arranged in parallel in the axial direction of the built-in strut.
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