To solve the problem that a lower part of a vehicular fuel tank is structurally covered with a cover to be insulated from heat, in order to deal with the problem that as the vehicular fuel tank is provided in a lower part of a vehicle body, a temperature of the tank is increased by radiation heat from a ground surface and the like when outside air temperature is high and therefore inner pressure increases, which may cause risk and cause an environmental problem that volatile components of fuel are discharged to outside air, where it is required for a thickness of a heat insulation material to be increased for achieving sufficient heat insulation performance, which has disadvantages that shape followability by forming die deteriorates and material costs increase.SOLUTION: Two foam sheets 34 and 36 of thermoplastic resin are used as materials of a heat insulation cover 24 for covering a fuel tank 38, and a space 30 is formed between the two sheets 34 and 36, so that sufficient heat insulation performance can be achieved even if the foam sheets 34 and 36 with thinner thicknesses are used and further, material costs can be suppressed low.SELECTED DRAWING: Figure 1
【課題】例えば、車両用の燃料タンクは車体下部に設けられるため、外気温が高いときは地面からの輻射熱等で温度上昇し、内圧が高まって危険であったり、燃料の揮発成分が外気に放出されて環境問題になる。そこで、燃料タンクの下部をカバーで覆って断熱するようになっているが、充分な断熱性能を得るには断熱材の厚みを大きくする必要がある。しかし厚みを大きくすると、成形型による形状追従性が低下し、また素材コストが嵩む欠点がある。【解決手段】燃料タンク38を覆う断熱カバー24の素材を2枚の熱可塑性樹脂の発泡シート34,36とし、2枚のシート34,36の間に空間30を形成することで、厚みの薄い発泡シート34,36を使用しても充分な断熱性能が得られるようになった。また、素材コストも低く抑えることができる。【選択図】図1
HEAT INSULATION COVER OF FUEL TANK AND METHOD FOR MANUFACTURING HEAT INSULATION COVER
燃料タンクの断熱カバーおよび断熱カバーの製造方法
2019-03-14
Patent
Elektronische Ressource
Japanisch
LAMINATE HEAT INSULATION FILM AND HEAT INSULATION COVER
Europäisches Patentamt | 2017
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