JP4966280B2 - Construction machinery fuel tank - Google Patents

Construction machinery fuel tank Download PDF

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JP4966280B2
JP4966280B2 JP2008242886A JP2008242886A JP4966280B2 JP 4966280 B2 JP4966280 B2 JP 4966280B2 JP 2008242886 A JP2008242886 A JP 2008242886A JP 2008242886 A JP2008242886 A JP 2008242886A JP 4966280 B2 JP4966280 B2 JP 4966280B2
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shaped member
plate
fuel tank
shaped
construction machine
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JP2010070165A (en
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奈津子 堀
武史 樋口
隆之 佐藤
高橋　　毅
孝之 大野
直輝 前田
純 山林
聡美 近藤
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Hitachi Construction Machinery Co Ltd
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Hitachi Construction Machinery Co Ltd
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Description

本発明は、油圧ショベル、機械式ショベル、油圧クレーン、ホイールローダ等の建設機械に搭載され、エンジンを駆動する燃料が蓄えられる建設機械の燃料タンクに関する。   The present invention relates to a fuel tank for a construction machine that is mounted on a construction machine such as a hydraulic excavator, a mechanical excavator, a hydraulic crane, or a wheel loader and that stores fuel for driving an engine.

図１２は従来の建設機械の燃料タンクを示す斜視図、図１３は図１２に示す燃料タンクの要部構成を示す斜視図、図１４は従来の燃料タンクに備えられる第１Ｕ字状部材を示す斜視図、図１５は従来の燃料タンクに備えられる第２Ｕ字状部材を示す斜視図、図１６は図１３の要部拡大図である。   12 is a perspective view showing a fuel tank of a conventional construction machine, FIG. 13 is a perspective view showing a configuration of a main part of the fuel tank shown in FIG. 12, and FIG. 14 shows a first U-shaped member provided in the conventional fuel tank. FIG. 15 is a perspective view showing a second U-shaped member provided in a conventional fuel tank, and FIG. 16 is an enlarged view of a main part of FIG.

油圧ショベル等の建設機械の旋回体に搭載され、エンジンを駆動する燃料が蓄えられる図１２に示す従来の燃料タンク２０は、図１３にその要部を示すように、上側に配置される第１Ｕ字状部材２１と、この第１Ｕ字状部材２１の下側に配置される第２Ｕ字状部材２２とを組み込み、溶接部によって一体化したものから成っており、ほぼ六面体を形成している。   A conventional fuel tank 20 shown in FIG. 12, which is mounted on a revolving body of a construction machine such as a hydraulic excavator and stores fuel for driving the engine, is arranged on the upper side as shown in FIG. The character-shaped member 21 and the second U-shaped member 22 arranged below the first U-shaped member 21 are assembled and integrated by a welded portion, forming a substantially hexahedron.

第１Ｕ字状部材２１は、図１４に示すように、外側に位置する正面板２１Ａと、この正面板２１Ａと対向する背面板２１Ｂと、これらの正面板２１Ａと背面板２１Ｂとを接続する上面板２１Ｃとを有している。正面板２１Ａは外側に向って凸となる曲面板から成っている。また、正面板２１Ａと上面板２１Ｃとを、外側に向って凸となり正面板２１Ａの曲率半径よりも小さい曲率半径を有する曲面板２１Ｄによって接続してある。   As shown in FIG. 14, the first U-shaped member 21 is connected to the front plate 21A located outside, the back plate 21B facing the front plate 21A, and the front plate 21A and the back plate 21B. And a face plate 21C. The front plate 21A is formed of a curved plate that is convex outward. Further, the front plate 21A and the upper surface plate 21C are connected by a curved plate 21D that protrudes outward and has a radius of curvature smaller than that of the front plate 21A.

上述のように正面板２１Ａを外側に凸となる曲面板によって形成したこと、及び曲率半径の小さい曲面板２１Ｄによって正面板２１Ａと上面板２１Ｃとを接続したことによって、旋回体上に搭載される燃料タンク２０の軽量化を実施した場合の、すなわち、第１Ｕ字状部材２１及び第２Ｕ字状部材２２それぞれの板厚を薄くした場合のこの燃料タンク２０の強度を確保している。   As described above, the front plate 21A is formed by a curved plate protruding outward, and the front plate 21A and the upper plate 21C are connected by the curved plate 21D having a small radius of curvature so that the front plate 21A is mounted on the revolving structure. The strength of the fuel tank 20 is ensured when the weight of the fuel tank 20 is reduced, that is, when the plate thickness of each of the first U-shaped member 21 and the second U-shaped member 22 is reduced.

第２Ｕ字状部材２２は、図１５に示すように、第１Ｕ字状部材２１の上面板２１Ｃと対向する底面板２２Ａと、この底面板２２Ａに連設され、第１Ｕ字状部材２１の正面板２１Ａと背面板２１Ｂとの間を塞ぐように互いに対向配置される一対の側面板２２Ｂ，２２Ｃを有している。これらの第２Ｕ字状部材２２と第１Ｕ字状部材２１とを互いに組み込んだときの、これらの第２Ｕ字状部材２２と第１Ｕ字状部材２１との全ての接合部分は、燃料タンク２０に収容される燃料が漏れないように溶接部によって一体化されている。例えば図１６に示すように、第１Ｕ字状部材２１の正面板２１Ａの下端部２１Ａ１と、第２Ｕ字状部材２２の底面板２２Ａの前端部２２Ａ１との接合部分の全域にわたって溶接部２３が設けられており、これによって第１Ｕ字状部材２１の正面板２１Ａと第２Ｕ字状部材２２の底面板２２Ａとが一体化されている。この種の従来技術として特許文献１に示されるものがある。
実用新案登録第２５８２２３９号公報 As shown in FIG. 15, the second U-shaped member 22 is connected to the bottom plate 22 </ b> A facing the top plate 21 </ b> C of the first U-shaped member 21, and the bottom plate 22 </ b> A. It has a pair of side plates 22B and 22C arranged to face each other so as to close the space between the face plate 21A and the back plate 21B. When the second U-shaped member 22 and the first U-shaped member 21 are assembled with each other, all joint portions of the second U-shaped member 22 and the first U-shaped member 21 are attached to the fuel tank 20. It is integrated by a welding part so that the fuel to be stored does not leak. For example, as shown in FIG. 16, the welded portion 23 is provided over the entire joining portion between the lower end portion 21A1 of the front plate 21A of the first U-shaped member 21 and the front end portion 22A1 of the bottom plate 22A of the second U-shaped member 22. Thus, the front plate 21A of the first U-shaped member 21 and the bottom plate 22A of the second U-shaped member 22 are integrated. There exists a thing shown by patent document 1 as this kind of prior art.
Utility Model Registration No. 2582239

上述した従来技術は、図１６に示すように、第１Ｕ字状部材２１の曲面板から成る正面板２１Ａの下端部２１Ａ１に、第２Ｕ字状部材２２の底面板２２Ａの前端部２２Ａ１を接合、すなわち当接するようにしてあることから、燃料タンク２０内の正面板２１Ａの下端部２１Ａ１と、底面板２２の前端部２２Ａ１との間に隙間２４を生じている。このため、この燃料タンク２０が備えられる建設機械の走行時、作業時等に生じる振動衝撃力や旋回体の旋回による遠心力で、正面板２１Ａが燃料タンク２０内の燃料等によって外側に向って押圧されると、同図１６に示す荷重Ｆによって隙間２４側に引張方向の高応力が発生する。   In the prior art described above, as shown in FIG. 16, the front end portion 22A1 of the bottom plate 22A of the second U-shaped member 22 is joined to the lower end portion 21A1 of the front plate 21A made of a curved plate of the first U-shaped member 21. In other words, since they are in contact with each other, a gap 24 is formed between the lower end portion 21A1 of the front plate 21A in the fuel tank 20 and the front end portion 22A1 of the bottom plate 22. For this reason, the front plate 21 </ b> A is directed outward by the fuel in the fuel tank 20 due to the vibration impact force generated when the construction machine provided with the fuel tank 20 is running, working, or the centrifugal force generated by the turning of the turning body. When pressed, a high stress in the tensile direction is generated on the gap 24 side by the load F shown in FIG.

これにより従来技術では、この正面板２１Ａの下端部２１Ａ１と底面板２２Ａの前端部２２Ａ１との接合部分に、すなわち溶接部２３に亀裂が生じる虞がある。このような亀裂が生じると、燃料漏れが発生してこの燃料タンク２０の周囲が燃料によって汚染される事態を招き、煩雑な燃料タンク２０の修復作業が必要になる。   As a result, in the prior art, there is a possibility that a crack occurs in the welded portion 23 at the joint portion between the lower end portion 21A1 of the front plate 21A and the front end portion 22A1 of the bottom plate 22A. If such a crack occurs, a fuel leak occurs and the surroundings of the fuel tank 20 are contaminated with fuel, and a complicated repair work of the fuel tank 20 is required.

本発明は、上記従来技術における実状からなされたもので、その目的は、第１Ｕ字状部材の正面板に生じる高応力による第１Ｕ字状部材の正面板の下端部と、第２Ｕ字状部材の底面板の前端部との接合部分における亀裂の発生を防ぐことができる建設機械の燃料タンクを提供することにある。   The present invention was made from the actual state in the above-described prior art, and the object thereof is the lower end portion of the front plate of the first U-shaped member due to high stress generated in the front plate of the first U-shaped member, and the second U-shaped member. Another object of the present invention is to provide a fuel tank for a construction machine that can prevent the occurrence of cracks at the joint portion with the front end of the bottom plate.

この目的を達成するために、本発明に係る建設機械の燃料タンクは、上側に配置される第１Ｕ字状部材と、この第１Ｕ字状部材の下側に配置される第２Ｕ字状部材とを含み、上記第１Ｕ字状部材が、外側に位置する正面板と、この正面板と対向する背面板と、これらの正面板と背面板とを接続する上面板とを有し、上記第２Ｕ字状部材が、上記第１Ｕ字状部材の上記上面板と対向する底面板と、この底面板に連設され、上記第１Ｕ字状部材の上記前面板と上記背面板との間を塞ぐように互いに対向配置される一対の側面板とを有し、
上記第１Ｕ字状部材と上記第２Ｕ字状部材を組み込み、溶接部によって一体化し、ほぼ六面体を形成する建設機械の燃料タンクにおいて、上記第１Ｕ字状部材の上記正面板の下端部と、上記第２Ｕ字状部材の上記底面板の前端部との接合部分に設けられ、上記正面板の下端部の上記背面板から離れる方向の動きを規制する規制手段を備えたことを特徴としている。 In order to achieve this object, a fuel tank for a construction machine according to the present invention includes a first U-shaped member disposed on the upper side, and a second U-shaped member disposed on the lower side of the first U-shaped member. The first U-shaped member includes a front plate located outside, a back plate facing the front plate, and a top plate connecting the front plate and the back plate, and the second U A letter-shaped member is connected to the bottom plate facing the top plate of the first U-shaped member and the bottom plate so as to block between the front plate and the back plate of the first U-shaped member. A pair of side plates disposed opposite to each other,
In the fuel tank of the construction machine in which the first U-shaped member and the second U-shaped member are assembled and integrated by a welded portion to form a substantially hexahedron, the lower end portion of the front plate of the first U-shaped member; It is provided in the junction part with the front-end part of the said bottom face board of the 2nd U-shaped member, The regulation means which regulates the movement of the direction which leaves | separates from the said back board of the lower end part of the said front board is characterized by the above-mentioned.

このように構成した本発明は、この燃料タンクが備えられる建設機械の走行時、作業時等に生じる振動衝撃力や旋回体の旋回による遠心力で、第１Ｕ字状部材に備えられる正面板が燃料タンク内の燃料等によって外側に向って押圧され、正面板に引張方向の高応力が発生したときでも、正面板の下端部の第２Ｕ字状部材に備えられる底面板の前端部から離れる方向への動きが規制手段によって規制される。これにより、正面板と底面板とを接続する接合部分における亀裂の発生を防ぐことができる。   In the present invention configured as described above, the front plate provided in the first U-shaped member is a vibration impact force generated when the construction machine provided with the fuel tank is traveling, working, or the centrifugal force due to the turning of the turning body. The direction away from the front end portion of the bottom plate provided in the second U-shaped member at the lower end portion of the front plate even when a high stress in the tensile direction is generated on the front plate by being pressed outward by the fuel in the fuel tank The movement to is regulated by the regulation means. Thereby, generation | occurrence | production of the crack in the junction part which connects a front board and a bottom board can be prevented.

また、本発明に係る建設機械の燃料タンクは、上記発明において、上記規制手段が、上記第１Ｕ字状部材の上記正面板の下端部に形成され、断面Ｕ字形のフック状部と、上記第２Ｕ字状部材の上記底面板の前端部に形成され、下方に向って折り曲げられるとともに、上記フック状部内に挿入される折り曲げ部とから成り、上記フック状部と上記底面板の裏面とを接続する溶接部を設けたことを特徴としている。   In the fuel tank for a construction machine according to the present invention, in the above invention, the regulating means is formed at a lower end portion of the front plate of the first U-shaped member, and has a hook-shaped portion having a U-shaped cross section. Formed at the front end of the bottom plate of the 2U-shaped member and bent downward and connected to the hook-shaped portion and connected to the back surface of the bottom plate. It is characterized by providing a welded portion.

また、本発明に係る建設機械の燃料タンクは、上記発明において、上記第１Ｕ字状部材の上記背面板の下端部と、上記第２Ｕ字状部材の上記底面板の前記前端部とは反対側に位置する後端部との接合部分に、上記背面板の下端部の上記正面板から離れる方向の動きを規制する別の規制手段を備えたことを特徴としている。   The fuel tank of the construction machine according to the present invention is the above-described invention, wherein the lower end portion of the back plate of the first U-shaped member and the front end portion of the bottom plate of the second U-shaped member are opposite to each other. It is characterized in that another restricting means for restricting the movement of the lower end portion of the back plate in the direction away from the front plate is provided at the joint portion with the rear end portion located at the position.

このように構成した本発明は、この燃料タンクが備えられる建設機械の走行時、作業時等に生じる振動衝撃力や旋回体の旋回による遠心力で、第１Ｕ字状部材に備えられる背面板が燃料タンク内の燃料等によって外側に向って押圧され、背面板に引張方向の高応力が発生したときでも、背面板の下端部の第２Ｕ字状部材に備えられる底面板の後端部から離れる方向への動きが規制手段によって規制される。これにより、背面板と底面板とを接続する接合部分における亀裂の発生を防ぐことができる。   In the present invention configured as described above, the back plate provided to the first U-shaped member is a vibration impact force generated during traveling of the construction machine provided with the fuel tank, working, or the centrifugal force generated by the turning of the turning body. Even when the back plate is pressed outward by the fuel in the fuel tank and a high stress in the tensile direction is generated on the back plate, the back plate separates from the rear end of the bottom plate provided in the second U-shaped member at the lower end of the back plate. Movement in the direction is regulated by the regulating means. Thereby, generation | occurrence | production of the crack in the junction part which connects a backplate and a bottom board can be prevented.

また、本発明に係る建設機械の燃料タンクは、上記発明において、上記別の規制手段が、上記第１Ｕ字状部材の上記背面板の下端部に形成され、断面Ｕ字状のフック状部と、上記第２Ｕ字状部材の上記底面板の後端部に形成され、下方向に折り曲げられるとともに、上記背面板の上記フック状部内に挿入される折り曲げ部とから成り、上記背面板の上記フック状部と上記底面板の裏面とを接続する溶接部を設けたことを特徴としている。   Further, in the fuel tank of the construction machine according to the present invention, in the above invention, the another regulating means is formed at a lower end portion of the back plate of the first U-shaped member, and has a hook-shaped portion having a U-shaped cross section. The hook of the back plate is formed at the rear end of the bottom plate of the second U-shaped member and is bent downward and inserted into the hook-like portion of the back plate. The welding part which connects a shape part and the back surface of the said baseplate is provided.

また、本発明に係る建設機械の燃料タンクは、上記発明において、上記第１Ｕ字状部材の上記正面板が、外側に向って凸となる曲面板から成り、上記正面板と上記上面板とを、外側に向って凸となるとともに上記正面板の曲率半径よりも小さい曲率半径を有する曲面板によって接続したことを特徴としている。   The fuel tank of the construction machine according to the present invention is the fuel tank according to the present invention, wherein the front plate of the first U-shaped member is a curved plate protruding outward, and the front plate and the upper plate are Further, it is characterized in that it is connected by a curved plate having a curvature radius which is convex toward the outside and which is smaller than the curvature radius of the front plate.

本発明は、第１Ｕ字状部材の正面板の下端部と、第２Ｕ字状部材の底面板の前端部との接合部分に設けられ、正面板の下端部の背面板から離れる方向の動きを規制する規制手段を備えたことから、この燃料タンクが備えられる建設機械の走行時、作業時等に生じる振動衝撃力や旋回体の旋回による遠心力で、正面板が燃料タンク内の燃料等によって外側に向って押圧され、正面板に引張方向の高応力が発生したときでも、正面板の下端部の底面板の前端部から離れる方向への動きが規制される。これにより、正面板と底面板とを接続する接合部分における亀裂の発生を防ぐことができる。したがって、このような亀裂による燃料漏れ、及び漏れた燃料による燃料タンクの周囲への汚染を防止でき、また、煩雑な燃料タンクの亀裂の修復作業を要することがなく、信頼性の高い堅牢な構造を実現させることができる。   The present invention is provided at a joint portion between the lower end portion of the front plate of the first U-shaped member and the front end portion of the bottom plate of the second U-shaped member, and moves in a direction away from the rear plate of the lower end portion of the front plate. Due to the regulation means to regulate, the front plate is driven by the fuel in the fuel tank, etc. due to the vibration impact force generated when the construction machine equipped with this fuel tank is running, working, etc. or the centrifugal force due to the turning of the turning body Even when pressed toward the outside and high stress in the tensile direction is generated on the front plate, the movement of the lower end portion of the front plate in the direction away from the front end portion of the bottom plate is restricted. Thereby, generation | occurrence | production of the crack in the junction part which connects a front board and a bottom board can be prevented. Therefore, it is possible to prevent fuel leakage due to such cracks and contamination of the fuel tank surroundings by the leaked fuel, and there is no need for complicated repair work of fuel tank cracks, and a highly reliable and robust structure. Can be realized.

以下、本発明に係る建設機械の燃料タンクを実施するための最良の形態を図に基づいて説明する。   Hereinafter, the best mode for carrying out a fuel tank of a construction machine according to the present invention will be described with reference to the drawings.

図１は本発明に係る燃料タンクの第１実施形態が備えられる建設機械の一例として挙げた油圧ショベルを示す側面図、図２は図１に示す油圧ショベルに備えられる旋回体を示す斜視図である。   FIG. 1 is a side view showing a hydraulic excavator cited as an example of a construction machine provided with the first embodiment of a fuel tank according to the present invention, and FIG. 2 is a perspective view showing a revolving structure provided in the hydraulic excavator shown in FIG. is there.

これらの図１に示すように、本発明に係る燃料タンクの第１実施形態が備えられる建設機械は、例えば油圧ショベルであり、走行体１と、旋回装置２を介して走行体１上に搭載される旋回体３と、この旋回体３に上下方向の回動可能に取り付けられ、掘削作業等を行なうフロント作業機４とを備えている。旋回体３の旋回フレーム３Ａ上の前側位置には運転室５が配置され、後側位置には重量バランスを確保するカウンタウエイト６が配置され、運転室５とカウンタウエイト６との間には、エンジン、このエンジンによって駆動する油圧ポンプ、コントロールバルブ等の各種の機器が収容される建屋７が配置されている。   As shown in FIG. 1, the construction machine provided with the first embodiment of the fuel tank according to the present invention is a hydraulic excavator, for example, and is mounted on the traveling body 1 via the traveling body 1 and the turning device 2. And a front work machine 4 that is attached to the swivel body 3 so as to be pivotable in the vertical direction and that performs excavation work or the like. A driver's cab 5 is disposed at a front position on the swivel frame 3A of the swivel body 3 and a counterweight 6 for ensuring a weight balance is disposed at a rear position, and between the cab 5 and the counterweight 6, A building 7 is arranged in which various devices such as an engine, a hydraulic pump driven by the engine, and a control valve are accommodated.

また、図２に示すように、建屋７に隣接する一方の側方部分には、エンジンを駆動する燃料が蓄えられる第１実施形態に係る燃料タンク８と、油圧ポンプ、コントロールバルブを含む油圧回路に給排される作動油が蓄えられる作動油タンク９とが備えられている。   In addition, as shown in FIG. 2, a hydraulic circuit including a fuel tank 8 according to the first embodiment in which fuel for driving the engine is stored, a hydraulic pump, and a control valve is disposed on one side portion adjacent to the building 7. And a hydraulic oil tank 9 in which the hydraulic oil supplied and discharged is stored.

図３は第１実施形態に係る燃料タンクの要部構成を示す斜視図、図４は第１実施形態に備えられる第１Ｕ字状部材を示す斜視図、図５は第１実施形態に備えられる第２Ｕ字状部材を示す斜視図、図６は第１実施形態に備えられる第１Ｕ字部材と第２Ｕ字状部材とを互いに組み込んだ状態を示す斜視図、図７は図６の要部拡大図である。   FIG. 3 is a perspective view showing a main configuration of the fuel tank according to the first embodiment, FIG. 4 is a perspective view showing a first U-shaped member provided in the first embodiment, and FIG. 5 is provided in the first embodiment. FIG. 6 is a perspective view showing a state in which the first U-shaped member and the second U-shaped member provided in the first embodiment are assembled with each other, and FIG. 7 is an enlarged view of a main part of FIG. FIG.

第１実施形態に係る燃料タンク８も、前述した図１２〜図１６に示したものと同様の基本構成を備えている。すなわち、図３にその要部を示すように、第１実施形態に係る燃料タンク８は、上側に配置される第１Ｕ字状部材１０と、この第１Ｕ字状部材１０の下側に配置される第２Ｕ字状部材１１とを組み込み、溶接部によって一体化したものから成っており、ほぼ六面体を形成している。   The fuel tank 8 according to the first embodiment also has a basic configuration similar to that shown in FIGS. That is, as shown in FIG. 3, the fuel tank 8 according to the first embodiment is disposed on the upper side of the first U-shaped member 10 and on the lower side of the first U-shaped member 10. The second U-shaped member 11 is incorporated and integrated by a welded portion, and substantially forms a hexahedron.

第１Ｕ字状部材１０は、図４に示すように、外側に位置する正面板１０Ａと、この正面板１０Ａと対向する背面板１０Ｂと、この正面板１０Ａと背面板１０Ｂとを接続する上面板１０Ｃとを有している。正面板１０Ａは外側に向って凸となる曲面板から成っている。また、正面板１０Ａと上面板１０Ｃとを、外側に向って凸となり正面板１０Ａの曲率半径よりも小さい曲率半径を有する曲面板１０Ｄによって接続してある。   As shown in FIG. 4, the first U-shaped member 10 includes a front plate 10A located on the outside, a back plate 10B facing the front plate 10A, and an upper plate connecting the front plate 10A and the back plate 10B. 10C. The front plate 10A is formed of a curved plate that is convex outward. Further, the front plate 10A and the upper surface plate 10C are connected by a curved plate 10D that protrudes outward and has a radius of curvature smaller than that of the front plate 10A.

前述したように、正面板１０Ａを外側に凸となる曲面板によって形成したこと、及び曲率半径の小さい曲面板１０Ｄによって正面板１０Ａと上面板１０Ｃとを接続したことによって、第１Ｕ字状部材１０及び第２Ｕ字状部材１１それぞれの板厚を薄くして軽量化を実施した場合のこの燃料タンク８の強度を確保できる。   As described above, the first U-shaped member 10 is formed by connecting the front plate 10A and the top plate 10C with the curved plate 10D having a small curvature radius, and forming the front plate 10A with a curved plate protruding outward. And the intensity | strength of this fuel tank 8 at the time of implementing weight reduction by making the plate | board thickness of each 2nd U-shaped member 11 thin is securable.

第２Ｕ字状部材１１は、図５に示すように、第１Ｕ字状部材１０の上面板１０Ｃと対向する底面板１１Ａと、この底面板１１Ａに連設され、第１Ｕ字状部材１０の正面板１０Ａと背面板１０Ｂとの間を塞ぐように互いに対向配置される一対の側面板１１Ｂ，１１Ｃとを有している。これらの第２Ｕ字状部材１１と第１Ｕ字状部材１０とを互いに組み込んだときの、これらの第２Ｕ字状部材１１と第１Ｕ字状部材１０との全ての接合部分は、燃料タンク８に収容される燃料が漏れないように溶接部によって一体化されている。   As shown in FIG. 5, the second U-shaped member 11 is connected to the bottom plate 11 </ b> A facing the top plate 10 </ b> C of the first U-shaped member 10, and the bottom plate 11 </ b> A. It has a pair of side plates 11B and 11C that are arranged to face each other so as to close the space between the face plate 10A and the back plate 10B. When the second U-shaped member 11 and the first U-shaped member 10 are assembled with each other, all joint portions of the second U-shaped member 11 and the first U-shaped member 10 are attached to the fuel tank 8. It is integrated by a welding part so that the fuel to be stored does not leak.

そして、この第１実施形態は、第１Ｕ字状部材１０の正面板１０Ａの下端部と、第２Ｕ字状部材１１の底面板１１Ａの前端部との接合部分に設けられ、正面板１０Ａの下端部の背面板１０Ｂから離れる方向の動きを規制する規制手段を備えている。この規制手段は、例えば図４〜図７に示すように、第１Ｕ字状部材１０の正面板１０Ａの下端部に形成され、断面Ｕ字形のフック状部１０Ａ１と、第２Ｕ字状部材１１の底面板１１Ａの前端部に形成され、下方に向って折り曲げられるとともに、フック状部１０Ａ１内に挿入される折り曲げ部１１Ａ３とから成っている。図７に示すように、第１Ｕ字状部材１０の正面板１０Ａのフック状部１０Ａ１と第２Ｕ字状部材１１の底面板１１Ａの裏面との接合部分には溶接部１２を設けてあり、この溶接部１２によって、正面板１０Ａと底面板１１Ａとは一体化されている。   And this 1st Embodiment is provided in the junction part of the lower end part of 10 A of front plates of the 1st U-shaped member 10, and the front end part of 11 A of bottom face boards of the 2nd U-shaped member 11, and the lower end of 10 A of front plates There is a restricting means for restricting the movement of the part away from the back plate 10B. For example, as shown in FIGS. 4 to 7, this restricting means is formed at the lower end portion of the front plate 10 </ b> A of the first U-shaped member 10, and has a hook-shaped portion 10 </ b> A <b> 1 having a U-shaped cross section and the second U-shaped member 11. It is formed at the front end portion of the bottom plate 11A, and is formed of a bent portion 11A3 that is bent downward and inserted into the hook-like portion 10A1. As shown in FIG. 7, a welded portion 12 is provided at a joint portion between the hook-shaped portion 10 </ b> A <b> 1 of the front plate 10 </ b> A of the first U-shaped member 10 and the bottom surface 11 </ b> A of the second U-shaped member 11. The front plate 10A and the bottom plate 11A are integrated by the welded portion 12.

なお、第１Ｕ字状部材１０の幅寸法は、第２Ｕ字状部材１０の一対の側面板１１Ｂ，１１Ｃの外表面間の寸法よりも大きく設定してあり、第１Ｕ字状部材１０の背面板１０Ｂの高さ寸法及び正面板１０Ａの高さ寸法は、第２Ｕ字状部材１１の側面板１１Ｂ，１１Ｃの高さ寸法よりも大きく設定してある。これにより第１Ｕ字状部材１０と第２Ｕ字状部材１１との接合部分に設けられる各溶接部が、第１Ｕ字状部材１０によって覆われ、外部から見えにくくなるように配置される。   In addition, the width dimension of the 1st U-shaped member 10 is set larger than the dimension between the outer surfaces of a pair of side surface plates 11B and 11C of the 2nd U-shaped member 10, and the back plate of the 1st U-shaped member 10 The height dimension of 10B and the height dimension of the front plate 10A are set larger than the height dimensions of the side plates 11B and 11C of the second U-shaped member 11. Thereby, each welding part provided in the junction part of the 1st U-shaped member 10 and the 2nd U-shaped member 11 is covered with the 1st U-shaped member 10, and it arrange | positions so that it may become difficult to see from the exterior.

また、第２Ｕ字状部材１１の底面板１１Ａの前端部に設けた折り曲げ部１１Ａ３の根元部分、及びこの根元部分付近の側面板１１Ｂ，１１Ｃの下端部分に、切欠き部１１Ａ１，１１Ａ２が形成されている。これらの切欠き部１１Ａ１，１１Ａ２は、底面板１１Ａの前端部に折り曲げ部１１Ａ３を加工する際に、折り曲げ部１１Ａ３に応力集中によるしわを発生させないようにするために設けられている。第１Ｕ字状部材１０と第２Ｕ字状部材１１とが互いに組み込まれ、溶接によって一体化された際には、図３に示すように、切欠き部１１Ａ１，１１Ａ２も溶接によって塞がれるようになっている。また、同図３では図示を省略してあるが、第１Ｕ字状部材１０の上面板１０Ｃには、エンジンへの燃料の供給を可能とする供給口が形成されるようになっている。   In addition, notches 11A1 and 11A2 are formed in the base portion of the bent portion 11A3 provided at the front end portion of the bottom plate 11A of the second U-shaped member 11 and the lower end portions of the side plates 11B and 11C in the vicinity of the base portion. ing. These notches 11A1 and 11A2 are provided to prevent wrinkles due to stress concentration in the bent portion 11A3 when the bent portion 11A3 is processed in the front end portion of the bottom plate 11A. When the first U-shaped member 10 and the second U-shaped member 11 are assembled with each other and integrated by welding, the notches 11A1 and 11A2 are also closed by welding as shown in FIG. It has become. Although not shown in FIG. 3, the upper surface plate 10C of the first U-shaped member 10 is formed with a supply port that allows fuel to be supplied to the engine.

また、第１Ｕ字状部材１０と第２Ｕ字状部材１１との組み込みに際しては、第１Ｕ字状部材１０の一方の側方から、第２Ｕ字状部材１１の折り曲げ部１１Ａ３を第１Ｕ字状部材１０のフック状部１０Ａ１内に少しずつ挿入させるようにして、第２Ｕ字状部材１１または第１Ｕ字状部材１０を押し込むことによって互いに組み込むことができる。   Further, when the first U-shaped member 10 and the second U-shaped member 11 are assembled, the bent portion 11A3 of the second U-shaped member 11 is connected to the first U-shaped member from one side of the first U-shaped member 10. The second U-shaped member 11 or the first U-shaped member 10 can be inserted into each other by being inserted little by little into the ten hook-shaped portions 10A1.

このように構成した第１実施形態によれば、第１Ｕ字状部材１０の正面板１０Ａの下端部と、第２Ｕ字状部材１１の底面板１１Ａの前端部の接合部分に設けられ、正面板１０Ａの下端部の背面板１０Ｂから離れる方向の動きを規制するフック状部１０Ａ１と折り曲げ部１１Ａ３とから成る規制手段を備えていることから、この燃料タンク８が備えられる油圧ショベルの走行時、作業時等に生じる振動衝撃力や旋回体３の旋回による遠心力で、正面板１０Ａが燃料タンク８内の燃料等によって外側に向って押圧され、図７に示すように荷重Ｆによって正面板１０Ａに引張方向の高応力が発生したときでも、フック状部１０Ａ１と折り曲げ部１１Ａ３との係合によって、正面板１０Ａの下端部の底面板１１Ａの前端部から離れる方向への動きが規制される。これにより、正面板１０Ａのフック状部１０Ａ１と底面板１１Ａの裏面部とを接続する溶接部１２における亀裂の発生を防ぐことができる。したがって、このような亀裂による燃料漏れ、及び漏れた燃料による燃料タンク８の周囲への汚染を防止でき、また、煩雑な燃料タンク８の亀裂の修復作業を要することがなく、信頼性の高い堅牢な構造を実現させることができる。   According to 1st Embodiment comprised in this way, it is provided in the junction part of the lower end part of 10 A of front plates of the 1st U-shaped member 10, and the front end part of 11 A of bottom face boards of the 2nd U-shaped member 11, and a front plate Since there is a restricting means composed of a hook-like portion 10A1 and a bent portion 11A3 for restricting the movement of the lower end portion of 10A away from the back plate 10B, when the hydraulic excavator provided with the fuel tank 8 is traveling, The front plate 10A is pressed outward by the fuel in the fuel tank 8 or the like due to the vibration impact force generated at the time or the centrifugal force generated by the swiveling body 3, and is applied to the front plate 10A by the load F as shown in FIG. Even when high stress in the tensile direction occurs, the movement of the lower end portion of the front plate 10A in the direction away from the front end portion of the bottom plate 11A is regulated by the engagement of the hook-like portion 10A1 and the bent portion 11A3. It is. Thereby, generation | occurrence | production of the crack in the welding part 12 which connects the hook-shaped part 10A1 of 10 A of front plates, and the back surface part of 11 A of bottom face boards can be prevented. Therefore, fuel leakage due to such cracks and contamination of the surroundings of the fuel tank 8 due to the leaked fuel can be prevented, and no complicated repair work of the cracks in the fuel tank 8 is required, and the reliability is high and robust. A simple structure can be realized.

また、第１Ｕ字状部材１０の正面板１０Ａの下端部に形成したフック状部１０Ａ１に、第２Ｕ字状部材１１の底面板１１Ａの前端部に形成した下方に曲げられた折り曲げ部１１Ａ３を挿入させて互いに係合させるようにし、フック状部１０Ａ１と底面板１１Ａの裏面とを接続する溶接部１２を設けたことから、溶接部が外側に露出せず、美観を保つことができ、優れた意匠性を確保できる。   Further, a downward bent portion 11A3 formed at the front end portion of the bottom plate 11A of the second U-shaped member 11 is inserted into the hook-shaped portion 10A1 formed at the lower end portion of the front plate 10A of the first U-shaped member 10. Since the welded portion 12 that connects the hook-shaped portion 10A1 and the back surface of the bottom plate 11A is provided, the welded portion is not exposed to the outside, and the aesthetic appearance can be maintained. Designability can be secured.

また、上述したように、第１Ｕ字状部１０の材正面板１０Ａを外側に凸となる曲面板によって形成したこと、及び曲率半径の小さい曲面板１０Ｄによって正面板１０Ａと上面板１０Ｃとを接続したことによって、第１Ｕ字状部材１０及び第２Ｕ字状部材１１それぞれの板厚を薄くした燃料タンク８の軽量化と、必要な強度の確保とを実現させたことから、製作費を安くすることができる。   Further, as described above, the material front plate 10A of the first U-shaped portion 10 is formed of a curved plate protruding outward, and the front plate 10A and the upper plate 10C are connected by the curved plate 10D having a small curvature radius. As a result, the weight of the fuel tank 8 in which the plate thickness of each of the first U-shaped member 10 and the second U-shaped member 11 is reduced and the necessary strength is ensured, so that the manufacturing cost is reduced. be able to.

また、上述したように、第１Ｕ字状部材１０と第２Ｕ字状部材１１との組み込みに際して、第１Ｕ字状部材１０の一方の側方から、第２Ｕ字状部材１１の折り曲げ部１１Ａ３を第１Ｕ字状部材１０のフック状部１０Ａ１内に少しずつ挿入させるようにして、第１Ｕ字状部材１０と第２Ｕ字状部材１１とを円滑に組み込むことができることから、これらの第１Ｕ字状部材１０と第２Ｕ字状部材１１の組み込み作業性に優れ、この燃料タンク８の製作作業能率の向上に貢献する。   Further, as described above, when the first U-shaped member 10 and the second U-shaped member 11 are assembled, the bent portion 11A3 of the second U-shaped member 11 is connected to the first U-shaped member 11 from one side. Since the first U-shaped member 10 and the second U-shaped member 11 can be smoothly inserted into the hook-shaped portion 10A1 of the 1U-shaped member 10 little by little, these first U-shaped members 10 and the second U-shaped member 11 are excellent in assembling workability, and contribute to the improvement of the manufacturing work efficiency of the fuel tank 8.

図８は本発明に係る燃料タンクの第２実施形態の要部構成を示す斜視図、図９は第２実施形態に備えられる第１Ｕ字状部材を示す斜視図、図１０は第２実施形態に備えられる第２Ｕ字状部材を示す斜視図、図１１は第２実施形態に備えられる第１Ｕ字状部材と第２Ｕ字状部材を互いに組み込んだ状態を示す斜視図である。   FIG. 8 is a perspective view showing a main configuration of a fuel tank according to a second embodiment of the present invention, FIG. 9 is a perspective view showing a first U-shaped member provided in the second embodiment, and FIG. 10 is a second embodiment. FIG. 11 is a perspective view showing a state in which the first U-shaped member and the second U-shaped member provided in the second embodiment are assembled with each other.

この第２実施形態は、第１Ｕ字状部材１０の背面板１０Ｂの下端部と、第２Ｕ字状部材１１の底面板１１Ａの前端部とは反対側に位置する後端部との接合部分に設けられ、背面板１０Ｂの下端部の正面板１０Ａから離れる方向の動きを規制する別の規制手段を備えている。この別の規制手段は、図９等に示すように、第１Ｕ字状部材１０の背面板１０Ｂの下端部に形成され、断面Ｕ字形のフック状部１０Ｂ１と、図１０等に示すように、第２Ｕ字状部材１１の底面板１１Ａの後端部に形成され、下方に向って折り曲げられるとともに、フック状部１０Ｂ１内に挿入される折り曲げ部１１Ａ６から成っている。底面板１１Ａの後端部に設けた折り曲げ部１１Ａ６の根元部分、及びこの根元部分付近の側面板１１Ｂ，１１Ｃの下端部分には、切欠き部１１Ａ４，１１Ａ５が形成されている。図示しないが第１Ｕ字状部材１０の背面板１０Ｂのフック状部１０Ｂ１と第２Ｕ字状部材１１の底面板１１Ａの裏面との接合部分には溶接部を設けてあり、この溶接部によって、背面板１０Ｂと底面板１１Ａとは一体化されている。その他の構成は上述した第１実施形態と同等である。   In the second embodiment, the lower end of the back plate 10B of the first U-shaped member 10 and the rear end of the second U-shaped member 11 located on the opposite side of the front end of the bottom plate 11A are joined. Provided is another restricting means for restricting the movement of the lower end portion of the back plate 10B in the direction away from the front plate 10A. This other restricting means is formed at the lower end of the back plate 10B of the first U-shaped member 10 as shown in FIG. 9 and the like, as shown in FIG. The second U-shaped member 11 is formed at the rear end portion of the bottom plate 11A, and is bent downward, and includes a bent portion 11A6 inserted into the hook-like portion 10B1. Cutout portions 11A4 and 11A5 are formed at the root portion of the bent portion 11A6 provided at the rear end portion of the bottom plate 11A and the lower end portions of the side plates 11B and 11C near the root portion. Although not shown, a welded portion is provided at a joint portion between the hook-shaped portion 10B1 of the back plate 10B of the first U-shaped member 10 and the back surface of the bottom plate 11A of the second U-shaped member 11. The face plate 10B and the bottom plate 11A are integrated. Other configurations are the same as those of the first embodiment described above.

このように構成した第２実施形態は、上述した第１実施形態と同等の作用効果が得られる他、第１Ｕ字状部材１０の背面板１０Ｂの下端部と、第２Ｕ字状部材１１の底面板１１Ａの後端部の接合部分に設けられ、背面板１０Ｂの下端部の正面板１０Ａから離れる方向の動きを規制するフック状部１０Ｂ１と折り曲げ部１１Ａ６とから成る別の規制手段も備えていることから、この燃料タンク８が備えられる油圧ショベルの走行時、作業時等に生じる振動衝撃力や旋回体３の旋回による遠心力で、背面板１０Ｂが燃料タンク８内の燃料等によって押圧され、背面板１０Ｂに引張方向の高応力が発生したときでも、フック状部１０Ｂ１と折り曲げ部１１Ａ６との係合によって、背面板１０Ｂの下端部の底面板１１Ａの後端部から離れる方向への動きが規制される。これにより、背面板１０Ｂのフック状部１０Ｂ１と底面板１１Ａの裏面部とを接続する溶接部における亀裂の発生を防ぐことができる。したがって、このような亀裂による燃料漏れ、及び漏れた燃料による燃料タンク８の周囲への汚染を防止でき、また、煩雑な燃料タンク８の亀裂の修復作業を要することがなく、第１実施形態におけるよりもさらに信頼性の高い堅牢な構造を実現させることができる。   In the second embodiment configured as described above, the same effects as those of the first embodiment described above can be obtained, and the lower end of the back plate 10B of the first U-shaped member 10 and the bottom of the second U-shaped member 11 can be obtained. Another restricting means is provided at the joint portion of the rear end portion of the face plate 11A, and includes a hook-like portion 10B1 and a bent portion 11A6 for restricting the movement of the lower end portion of the back plate 10B away from the front plate 10A. Therefore, the back plate 10B is pressed by the fuel in the fuel tank 8 by the vibration impact force generated during the operation of the hydraulic excavator provided with the fuel tank 8 or the centrifugal force generated by the turning of the revolving structure 3, Even when a high stress in the tensile direction is generated on the back plate 10B, the movement of the lower end portion of the back plate 10B away from the rear end portion of the bottom plate 11A by the engagement of the hook-like portion 10B1 and the bent portion 11A6. There is restricted. Thereby, generation | occurrence | production of the crack in the welding part which connects the hook-shaped part 10B1 of the back surface board 10B and the back surface part of the bottom face board 11A can be prevented. Therefore, fuel leakage due to such cracks and contamination of the surroundings of the fuel tank 8 due to the leaked fuel can be prevented, and complicated repair work for cracks in the fuel tank 8 is not required, and in the first embodiment. A more reliable and robust structure can be realized.

なお、上記第１，第２実施形態では、規制手段を第１Ｕ字状部材１０の正面板１０Ａの下端部に設けたフック状部１０Ａ１と、第２Ｕ字状部材１１の底面板１１Ａの前端部に下方に折り曲げられるように形成され、フック状部１０Ａ１に係合する折り曲げ部１１Ａ３とによって構成してあるが、意匠性をそれほど考慮しなくて済む場合には、このように構成することに代えて、第２Ｕ字状部材１１の底面板１１Ａの前端部に上方に折り曲げ形成した折り曲げ部を設け、この折り曲げ部の内側にフック状部を形成していない第１Ｕ字状部材１０の正面板１０Ａの下端部を位置させ、上方に折り曲げ形成した底面板１１Ａの折り曲げ部の上端と、正面板１０Ａの下端部とを接続する溶接部を設ける構成にしてもよい。このように構成したものも、正面板１０Ａに引張方向の高応力が発生したときには、正面板１０Ａの下端部と、底面板１１Ａの折り曲げ部１１Ａ３との係合によって、正面板１０Ａの下端部の底面板１１Ａの前端部から離れる方向への動きが規制される。これにより、正面板１０Ａの下端部と底面板１１Ａの折り曲げ部とを接続する溶接部における亀裂の発生を防ぐことができる。   In the first and second embodiments, a hook-like portion 10A1 provided with a restricting means at the lower end portion of the front plate 10A of the first U-shaped member 10 and a front end portion of the bottom plate 11A of the second U-shaped member 11 are used. The bent portion 11A3 is formed so as to be bent downward and engages with the hook-like portion 10A1. Then, a bent portion formed by bending upward is provided at the front end portion of the bottom plate 11A of the second U-shaped member 11, and the front plate 10A of the first U-shaped member 10 in which the hook-shaped portion is not formed inside the bent portion. The bottom end portion of the bottom plate 11A may be positioned and a welded portion may be provided to connect the top end of the bent portion of the bottom plate 11A and the bottom end portion of the front plate 10A. Also in the case of this configuration, when high stress in the tensile direction is generated on the front plate 10A, the lower end portion of the front plate 10A is engaged with the lower end portion of the front plate 10A and the bent portion 11A3 of the bottom plate 11A. Movement in the direction away from the front end of the bottom plate 11A is restricted. Thereby, generation | occurrence | production of the crack in the welding part which connects the lower end part of 10 A of front plates, and the bending part of bottom board 11A can be prevented.

同様に、上記第２実施形態では、別の規制手段を第１Ｕ字状部材１０の背面板１０Ｂの下端部に設けたフック状部１０Ｂ１と、第２Ｕ字状部材１１の底面板１１Ａの後端部に下方に折り曲げられるように形成され、フック状部１０Ｂ１に係合する折り曲げ部１１Ａ６とによって構成してあるが、このように構成することに代えて、第２Ｕ字状部材１１の底面板１１Ａの後端部に上方に折り曲げ形成した折り曲げ部を設け、この折り曲げ部の内側にフック状部を形成していない第１Ｕ字状部材１０の背面板１０Ｂの下端部を位置させ、上方に折り曲げ形成した底面板１１Ａの折り曲げ部の上端と、背面板１０Ｂの下端部とを接続する溶接部を設ける構成にしてもよい。このように構成したものも、背面板１０Ｂに引張方向の高応力が発生したときには、背面板１０Ｂの下端部と底面板１１Ａの折り曲げ部との係合によって、背面板１０Ｂの下端部の底面板１１Ａの後端部から離れる方向への動きが規制される。これにより、背面板１０Ｂの下端部と底面板１１Ａの折り曲げ部とを接続する溶接部における亀裂の発生を防ぐことができる。   Similarly, in the second embodiment, the hook-like portion 10B1 provided with another regulating means at the lower end portion of the back plate 10B of the first U-shaped member 10, and the rear end of the bottom plate 11A of the second U-shaped member 11 The bent portion 11A6 is formed so as to be bent downward and is engaged with the hook-like portion 10B1, but instead of such a configuration, the bottom plate 11A of the second U-shaped member 11 is formed. A bent portion formed by bending upward is provided at the rear end portion, and the lower end portion of the back plate 10B of the first U-shaped member 10 not forming the hook-shaped portion is positioned inside the bent portion and bent upward. You may make it the structure which provides the welding part which connects the upper end of the bending part of 11 A of bottom plate which performed, and the lower end part of the backplate 10B. The bottom plate of the lower end portion of the back plate 10B is also configured by engaging the lower end portion of the back plate 10B and the bent portion of the bottom plate 11A when a high stress in the tensile direction is generated on the back plate 10B. The movement in the direction away from the rear end of 11A is restricted. Thereby, generation | occurrence | production of the crack in the welding part which connects the lower end part of backplate 10B and the bending part of bottom board 11A can be prevented.

本発明に係る燃料タンクの第１実施形態が備えられる建設機械の一例として挙げた油圧ショベルを示す側面図である。1 is a side view showing a hydraulic excavator cited as an example of a construction machine provided with a first embodiment of a fuel tank according to the present invention. 図１に示す油圧ショベルに備えられる旋回体を示す斜視図である。It is a perspective view which shows the turning body with which the hydraulic shovel shown in FIG. 1 is equipped. 第１実施形態に係る燃料タンクの要部構成を示す斜視図である。It is a perspective view which shows the principal part structure of the fuel tank which concerns on 1st Embodiment. 第１実施形態に備えられる第１Ｕ字状部材を示す斜視図である。It is a perspective view which shows the 1st U-shaped member with which 1st Embodiment is equipped. 第１実施形態に備えられる第２Ｕ字状部材を示す斜視図である。It is a perspective view which shows the 2nd U-shaped member with which 1st Embodiment is equipped. 第１実施形態に備えられる第１Ｕ字部材と第２Ｕ字状部材とを互いに組み込んだ状態を示す斜視図である。It is a perspective view which shows the state which mutually integrated the 1st U-shaped member and 2nd U-shaped member with which 1st Embodiment is equipped. 図６の要部拡大図である。It is a principal part enlarged view of FIG. 本発明に係る燃料タンクの第２実施形態の要部構成を示す斜視図である。It is a perspective view which shows the principal part structure of 2nd Embodiment of the fuel tank which concerns on this invention. 第２実施形態に備えられる第１Ｕ字状部材を示す斜視図である。It is a perspective view which shows the 1st U-shaped member with which 2nd Embodiment is equipped. 第２実施形態に備えられる第２Ｕ字状部材を示す斜視図である。It is a perspective view which shows the 2nd U-shaped member with which 2nd Embodiment is equipped. 第２実施形態に備えられる第１Ｕ字状部材と第２Ｕ字状部材を互いに組み込んだ状態を示す斜視図である。It is a perspective view which shows the state which mutually incorporated the 1st U-shaped member and 2nd U-shaped member with which 2nd Embodiment is equipped. 従来の建設機械の燃料タンクを示す斜視図である。It is a perspective view which shows the fuel tank of the conventional construction machine. 図１２に示す燃料タンクの要部構成を示す斜視図である。It is a perspective view which shows the principal part structure of the fuel tank shown in FIG. 従来の燃料タンクに備えられる第１Ｕ字状部材を示す斜視図である。It is a perspective view which shows the 1st U-shaped member with which the conventional fuel tank is equipped. 従来の燃料タンクに備えられる第２Ｕ字状部材を示す斜視図である。It is a perspective view which shows the 2nd U-shaped member with which the conventional fuel tank is equipped. 図１３の要部拡大図である。It is a principal part enlarged view of FIG.

符号の説明Explanation of symbols

３ 旋回体
４ フロント作業機
８ 燃料タンク
１０ 第１Ｕ字状部材
１０Ａ 正面板
１０Ａ１ フック状部（規制手段）
１０Ｂ 背面板
１０Ｂ１ フック状部（別の規制手段）
１０Ｃ 上面板
１０Ｄ 曲面板
１１ 第２Ｕ字状部材
１１Ａ 底面板
１１Ａ１ 切欠き部
１１Ａ２ 切欠き部
１１Ａ３ 折り曲げ部（規制手段）
１１Ａ４ 切欠き部
１１Ａ５ 切欠き部
１１Ａ６ 折り曲げ部（別の規制手段）
１１Ｂ 側面板
１１Ｃ 側面板
１２ 溶接部 DESCRIPTION OF SYMBOLS 3 Revolving body 4 Front work machine 8 Fuel tank 10 1st U-shaped member 10A Front plate 10A1 Hook-shaped part (regulation means)
10B Back plate 10B1 Hook-shaped part (another regulating means)
10C Top surface plate 10D Curved surface plate 11 2nd U-shaped member 11A Bottom surface plate 11A1 Notch portion 11A2 Notch portion 11A3 Bending portion (regulating means)
11A4 Notch 11A5 Notch 11A6 Bending part (another restricting means)
11B Side plate 11C Side plate 12 Welded part

Claims (5)

上側に配置される第１Ｕ字状部材と、この第１Ｕ字状部材の下側に配置される第２Ｕ字状部材とを含み、上記第１Ｕ字状部材が、外側に位置する正面板と、この正面板と対向する背面板と、これらの正面板と背面板とを接続する上面板とを有し、上記第２Ｕ字状部材が、上記第１Ｕ字状部材の上記上面板と対向する底面板と、この底面板に連設され、上記第１Ｕ字状部材の上記前面板と上記背面板との間を塞ぐように互いに対向配置される一対の側面板とを有し、
上記第１Ｕ字状部材と上記第２Ｕ字状部材を組み込み、溶接部によって一体化し、ほぼ六面体を形成する建設機械の燃料タンクにおいて、
上記第１Ｕ字状部材の上記正面板の下端部と、上記第２Ｕ字状部材の上記底面板の前端部との接合部分に設けられ、上記正面板の下端部の上記背面板から離れる方向の動きを規制する規制手段を備えたことを特徴とする建設機械の燃料タンク。 A first U-shaped member disposed on the upper side and a second U-shaped member disposed on the lower side of the first U-shaped member, wherein the first U-shaped member is located on the outside; A back plate facing the front plate, and a top plate connecting the front plate and the back plate, wherein the second U-shaped member is a bottom facing the top plate of the first U-shaped member. A face plate and a pair of side plates that are connected to the bottom plate and arranged to face each other so as to close the space between the front plate and the back plate of the first U-shaped member;
In the fuel tank of the construction machine in which the first U-shaped member and the second U-shaped member are assembled and integrated by a welded portion to form a substantially hexahedron,
The first U-shaped member is provided at a joint portion between the lower end portion of the front plate and the front end portion of the bottom plate of the second U-shaped member, in a direction away from the back plate at the lower end portion of the front plate. A fuel tank for a construction machine, comprising a regulation means for regulating movement. 請求項１に記載の建設機械の燃料タンクにおいて、
上記規制手段が、上記第１Ｕ字状部材の上記正面板の下端部に形成され、断面Ｕ字形のフック状部と、上記第２Ｕ字状部材の上記底面板の前端部に形成され、下方に向って折り曲げられるとともに、上記フック状部内に挿入される折り曲げ部とから成り、
上記フック状部と上記底面板の裏面とを接続する溶接部を設けたことを特徴とする建設機械の燃料タンク。 In the fuel tank of the construction machine according to claim 1,
The regulating means is formed at a lower end portion of the front plate of the first U-shaped member, formed at a hook-shaped portion having a U-shaped cross section, and a front end portion of the bottom plate of the second U-shaped member, and below A bent portion inserted into the hook-shaped portion,
A fuel tank for a construction machine, comprising a welded portion for connecting the hook-shaped portion and the back surface of the bottom plate. 請求項２に記載の建設機械の燃料タンクにおいて、
上記第１Ｕ字状部材の上記背面板の下端部と、上記第２Ｕ字状部材の上記底面板の前記前端部とは反対側に位置する後端部との接合部分に、上記背面板の下端部の上記正面板から離れる方向の動きを規制する別の規制手段を備えたことを特徴とする建設機械の燃料タンク。 The fuel tank for a construction machine according to claim 2,
The lower end of the back plate is joined to the lower end of the back plate of the first U-shaped member and the rear end of the second U-shaped member on the opposite side of the front end of the bottom plate. A fuel tank for a construction machine, comprising another restricting means for restricting the movement of the portion away from the front plate. 請求項３に記載の建設機械の燃料タンクにおいて、
上記別の規制手段が、上記第１Ｕ字状部材の上記背面板の下端部に形成され、断面Ｕ字状のフック状部と、上記第２Ｕ字状部材の上記底面板の後端部に形成され、下方向に折り曲げられるとともに、上記背面板の上記フック状部内に挿入される折り曲げ部とから成り、
上記背面板の上記フック状部と上記底面板の裏面とを接続する溶接部を設けたことを特徴とする建設機械の燃料タンク。 In the fuel tank of the construction machine according to claim 3,
The another restricting means is formed at a lower end portion of the back plate of the first U-shaped member, and formed at a hook-shaped portion having a U-shaped cross section and a rear end portion of the bottom plate of the second U-shaped member. And is folded downward and comprises a bent portion inserted into the hook-shaped portion of the back plate,
A fuel tank for a construction machine, comprising a welded portion for connecting the hook-shaped portion of the back plate and the back surface of the bottom plate. 請求項１〜４のいずれか１項に記載の建設機械の燃料タンクにおいて、
上記第１Ｕ字状部材の上記正面板が、外側に向って凸となる曲面板から成り、
上記正面板と上記上面板とを、外側に向って凸となるとともに上記正面板の曲率半径よりも小さい曲率半径を有する曲面板によって接続したことを特徴とする建設機械の燃料タンク。 In the fuel tank of the construction machine according to any one of claims 1 to 4,
The front plate of the first U-shaped member is a curved plate that is convex outward,
A fuel tank for a construction machine, wherein the front plate and the upper plate are connected by a curved plate that is convex outward and has a radius of curvature smaller than the radius of curvature of the front plate.
JP2008242886A 2008-09-22 2008-09-22 Construction machinery fuel tank Expired - Fee Related JP4966280B2 (en)

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