JP2007331518A

JP2007331518A - Fuel feed pipe

Info

Publication number: JP2007331518A
Application number: JP2006164405A
Authority: JP
Inventors: Hiromitsu Yoshida; 博光吉田
Original assignee: Asteer Co Ltd
Current assignee: Asteer Co Ltd
Priority date: 2006-06-14
Filing date: 2006-06-14
Publication date: 2007-12-27

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filler port using a shutter which is easily assembled, surely opened/closed by inserting a feed nozzle, and sufficiently secures a sealing property when closed. <P>SOLUTION: The filler port of this fuel feed pipe opens a guide part opening 321 by downward rotationally turning the shutter 4 by being pushed by the feed nozzle inserted from the filler port opening 22, and, when the feed nozzle is pulled out, upward rotationally turns the shutter to close the guide part opening 321. The filler port using the shutter 4 is so formed that an internal torsion coil spring 5 with a small coil diameter is fitted in a rotational shaft 7 of the shutter 4 provided in the guide part 3, an external torsion coil spring 6 with a large coil diameter is fitted in the internal torsion coil spring 5, the internal torsion coil spring 5 and the external torsion coil spring 6 are mounted on the rotational shaft 7 in a mutually fitted relation, and the internal torsion coil spring 5 and the external torsion coil spring 6 coact to rotationally turn the shutter 4 from the lower part and push it toward the guide part opening 321. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、燃料タンクに接続した給油管本体に設けられる給油口であって、給油口開口から挿入された給油ノズルを案内するガイド部開口を有し、捻りコイルバネにより前記ガイド部開口に下方から回動して押し付けられるシャッタを設け、前記シャッタが給油口開口から挿入された給油ノズルに押されて下向きに回動してガイド部開口を開き、前記給油ノズルを引き抜くと捻りコイルバネにより上向きに回動してガイド部開口を閉じる燃料給油管の給油口に関する。 The present invention is a fuel supply port provided in a fuel supply pipe main body connected to a fuel tank, having a guide portion opening for guiding a fuel supply nozzle inserted from the fuel supply port opening, and to the guide portion opening from below by a torsion coil spring A shutter that is rotated and pressed is provided, and the shutter is pushed downward by the fuel nozzle inserted from the fuel filler opening to rotate downward to open the guide opening, and when the fuel nozzle is pulled out, the shutter is rotated upward by a torsion coil spring. The present invention relates to a fuel filler opening of a fuel filler pipe that moves to close a guide opening.

燃料タンクに接続した給油管本体に設けられる給油口の多くは、給油口キャップを取り付けて塞ぎ、給油に際して前記給油口キャップを取り外し、外部から給油ノズルを給油口に挿入して燃料油を注入する。給油が終われば給油ノズルを給油口から引き抜き、再び給油口キャップを取り付けて、給油口を塞ぐ。給油口に給油口キャップを取り付けて塞ぐ給油口（以下、キャップ閉蓋形給油口）は、給油口のシール性を確保しやすい利点はあるが、給油口キャップを着脱する手間を有するほか、キャップ取付時の締め込み操作が不適切であると密閉が不十分になる虞や取り外した給油口キャップを紛失させる心配がある。 Many of the filler ports provided in the fuel tank main body connected to the fuel tank are closed by attaching a filler cap, removing the filler cap when refueling, and inserting a fuel nozzle from the outside into the filler port to inject fuel oil. . When refueling is completed, pull out the refueling nozzle from the refueling port, attach the refueling port cap again, and close the refueling port. The oil filler port (hereinafter referred to as the cap-closed type oil filler port) that is closed by attaching the filler port cap to the filler port has the advantage of ensuring the sealability of the filler port, but has the trouble of attaching and detaching the filler port cap. If the tightening operation at the time of installation is inappropriate, there is a possibility that the sealing will be insufficient, or that the removed filler cap may be lost.

そこで、特許文献１〜特許文献３に見られるように、外部から挿入された給油ノズルに押されて下向きに回動して開き、前記給油ノズルを引き抜くと上向きに回動して閉じるシャッタを設けた給油口（以下、シャッタ閉蓋形給油口）が提案されている。シャッタ閉蓋形給油口は、給油口キャップの締め忘れがないことはもちろん、実際に給油ノズルが挿入される直前まで給油口が閉じられており、給油ノズルを挿入して引き抜くまでの間、すなわち燃料油を注入する実質的な給油作業の間しか給油口が開放されず、燃料蒸気の放出を抑制できる利点がある。 Therefore, as seen in Patent Documents 1 to 3, a shutter is provided that is pushed by an oil supply nozzle inserted from the outside and pivots downward to open, and when the fuel nozzle is pulled out, a shutter that pivots upward and closes is provided. In addition, an oil filler opening (hereinafter referred to as a shutter-closed oil filler opening) has been proposed. The shutter-closed lubrication port is not to forget to tighten the lubrication port cap, but the lubrication port is closed until just before the actual lubrication nozzle is inserted, and until the lubrication nozzle is inserted and pulled out, that is, There is an advantage that the fuel supply port is opened only during the substantial refueling operation of injecting the fuel oil, and the release of fuel vapor can be suppressed.

実公平05-032334号公報No. 05-032334 仏国特許出願公開第2753138号明細書French Patent Application Publication No. 2753138 米国特許第5071018号明細書US Patent No. 5071018

特許文献１〜特許文献３に見られるシャッタ閉蓋形給油口は、給油口開口から挿入された給油ノズルを案内するガイド部開口を有し、捻りコイルバネにより前記ガイド部開口に下方から回動して押し付けられるシャッタを設け、前記シャッタが給油口開口から挿入された給油ノズルに押されて下向きに回動してガイド部開口を開き、前記給油ノズルを引き抜くと捻りコイルバネにより上向きに回動してガイド部開口を閉じる構成になっている。シャッタは、ガイド部に設けた回動軸に取り付けられ、前記回動軸に嵌めた捻りコイルバネの固定腕を給油口又はガイド部に固定し、自由状態から捻られた捻りコイルバネの作用腕をシャッタに下方から押し当てている。このとき、捻りコイルバネに曲げ応力（以下、閉鎖時曲げ応力）が発生している。 The shutter-closed type oil filler opening shown in Patent Documents 1 to 3 has a guide opening that guides a fuel nozzle inserted from the oil filler opening, and is rotated from below to the guide opening by a torsion coil spring. The shutter is pressed by the oil supply nozzle inserted from the opening of the oil supply opening and rotated downward to open the guide opening, and when the oil supply nozzle is pulled out, it is rotated upward by the torsion coil spring. The guide opening is closed. The shutter is attached to a rotating shaft provided in the guide portion, and a fixed arm of a torsion coil spring fitted to the rotating shaft is fixed to the oil supply port or the guide portion, and the working arm of the torsion coil spring is twisted from a free state. Is pressed from below. At this time, bending stress (hereinafter referred to as closing bending stress) is generated in the torsion coil spring.

給油口に挿入した給油ノズルがシャッタを押すと、シャッタは下方に回動して開く。このとき、捻りコイルバネに発生する曲げ応力は上記閉鎖時曲げ応力から更に増大し、シャッタが最大に開いた状態で前記曲げ応力（以下、開放時曲げ応力）が最大となる。これから、捻りコイルバネの許容曲げ応力は、開放時曲げ応力を上回る必要がある。ここで、シャッタを閉じた状態で給油口として要求される液密性及び気密性（以下、シール性）を満足するため、捻りコイルバネの閉鎖時曲げ応力は一定値以上が求められる。これから、シャッタが開くことによる曲げ応力の増分を抑えなければ、開放時曲げ応力が捻りコイルバネの許容曲げ応力を超えてしまう虞がある。 When the refueling nozzle inserted into the refueling port pushes the shutter, the shutter rotates downward and opens. At this time, the bending stress generated in the torsion coil spring further increases from the bending stress at the time of closing, and the bending stress (hereinafter referred to as opening bending stress) becomes maximum when the shutter is fully opened. From this, the allowable bending stress of the torsion coil spring needs to exceed the bending stress at the time of opening. Here, in order to satisfy the liquid tightness and air tightness (hereinafter referred to as sealability) required as an oil filler port with the shutter closed, the bending stress when the torsion coil spring is closed is required to be a certain value or more. From this, if the increase in bending stress due to the opening of the shutter is not suppressed, the bending stress at the time of opening may exceed the allowable bending stress of the torsion coil spring.

曲げ応力の増分を抑制するには、捻りコイルバネのバネ定数を小さくすればよい。例えば自由状態からシャッタを閉じた状態に至る捻りコイルバネの作用腕の捩れ角（以下、閉鎖時捩れ角）を大きくし、シャッタが最大に開く状態に至る捻りコイルバネの作用腕の捩れ角（以下、開放時捩れ角）と閉鎖時捩れ角との差分を開放時捩れ角に対して相対的に小さくすることが考えられる。しかし、あまり大きな閉鎖時捩れ角は、捻りコイルバネを捻ってシャッタを給油口又はガイド部に取り付ける組付作業を難しくし、現実的でない。また、捻りコイルバネの仕様、捻りコイルバネを構成する線材の太さや、捻りコイルバネのコイル径又は巻き数等を適切に設定すれば、バネ定数を小さくできる。しかし、給油口付近の狭い余剰空間に納める捻りコイルバネの大きさには制約があり、バネ定数を十分に小さくする仕様の設定が難しい。 In order to suppress the increase in bending stress, the spring constant of the torsion coil spring may be reduced. For example, the torsion angle of the working arm of the torsion coil spring from the free state to the closed state of the shutter (hereinafter referred to as the torsion angle when closed) is increased, and the torsion angle of the torsion coil spring from which the shutter opens to the maximum (hereinafter referred to as the torsion angle). It can be considered that the difference between the twist angle at the time of opening and the twist angle at the time of closing is relatively small with respect to the twist angle at the time of opening. However, a too large torsion angle at the time of closing makes the assembly operation of attaching the shutter to the fuel filler opening or the guide part by twisting the torsion coil spring, which is not practical. Further, if the specifications of the torsion coil spring, the thickness of the wire constituting the torsion coil spring, the coil diameter or the number of turns of the torsion coil spring, etc. are appropriately set, the spring constant can be reduced. However, there is a restriction on the size of the torsion coil spring that can be accommodated in a narrow surplus space near the fuel filler opening, and it is difficult to set specifications that sufficiently reduce the spring constant.

こうした事情から、現在のシャッタ閉蓋形給油口に用いられる捻りコイルバネは、開放時曲げ応力が許容曲げ応力を上回る状態で使用されることが少なくない。それでも、給油に伴うシャッタの開閉は頻度が少ないことから実用上問題ないとされるが、捻りコイルバネが万一破損するとシャッタが閉鎖できなくなり、給油口として重要なシール性が損なわれてしまい、問題である。これから、許容曲げ応力を上回る開放時曲げ応力の発生を許し、破損を招く虞のある態様で、捻りコイルバネを使用することは避ける方が好ましい。 For these reasons, the torsion coil spring used in the current shutter-closed type oil filler is often used in a state where the bending stress at the time of opening exceeds the allowable bending stress. Still, opening and closing of the shutter accompanying refueling is considered to be a practical problem because it is infrequent, but if the torsion coil spring breaks, the shutter cannot be closed, and the important sealing performance as a refueling port is impaired. It is. From this, it is preferable to avoid the use of the torsion coil spring in a mode that allows generation of bending stress at the time of opening exceeding the allowable bending stress and may cause breakage.

ここで、例えば特許文献３のシャッタ閉蓋形給油口のように、回転軸に左右一対の捻りコイルバネを２基嵌めた構成であれば、一方の捻りコイルバネが破損しても、残る他方の捻りコイルバネがシャッタをガイド部の開放端に押し付け、シール性を損なわせないことも考えられる。しかし、左右一対の捻りコイルバネを用いる構成は、各捻りコイルバネの巻き数が低下して個々のバネ定数が高くなり、開放時曲げ応力はかえって大きくなり、結局は各捻りコイルバネの耐久性を低下させてしまう。そこで、使用する捻りコイルバネの開放時曲げ応力を許容曲げ応力内に収めることを主眼としながら、組付が容易で、給油ノズルの挿入によるシャッタの開閉も確実で、更にシャッタを閉じた際のシール性が十分に確保できるシャッタ閉蓋形給油口について検討した。 Here, for example, in the case of a configuration in which two pairs of left and right torsion coil springs are fitted on the rotation shaft as in the shutter-closed type oil filler opening of Patent Document 3, even if one torsion coil spring breaks, the remaining torsion remains. It is also conceivable that the coil spring does not impair the sealing performance by pressing the shutter against the open end of the guide portion. However, the configuration using a pair of left and right torsion coil springs reduces the number of turns of each torsion coil spring, increases the individual spring constant, and increases the bending stress at the time of opening, eventually reducing the durability of each torsion coil spring. End up. Therefore, the main purpose is to keep the bending stress when the torsion coil spring to be used within the allowable bending stress, and it is easy to assemble, and the shutter can be opened and closed by inserting the oiling nozzle, and the seal when the shutter is closed. We examined a shutter-closed oil filler that can secure sufficient performance.

検討の結果開発したものが、燃料タンクに接続した給油管本体に設けられる給油口であって、給油口開口から挿入された給油ノズルを案内するガイド部開口を有し、捻りコイルバネにより前記ガイド部開口に下方から回動して押し付けられるシャッタを設け、前記シャッタが給油口開口から挿入された給油ノズルに押されて下向きに回動してガイド部開口を開き、前記給油ノズルを引き抜くと捻りコイルバネにより上向きに回動してガイド部開口を閉じる燃料給油管の給油口において、ガイド部に設けた支持軸にコイル径の小さな内捻りコイルバネを嵌め、前記内捻りコイルバネにコイル径の大きな外捻りコイルバネを嵌めて、内捻りコイルバネ及び外捻りコイルバネを嵌め合いの関係で前記支持軸に装着し、前記内捻りコイルバネ及び外捻りコイルバネが協働して、シャッタを下方から回動してガイド部開口に押し付けるシャッタ閉蓋形給油口である。内捻りコイルバネ及び外捻りコイルバネを嵌め合いの関係で装着する支持軸は、シャッタの回動軸と別でガイド部に設けてもよいが、シャッタの回動軸を支持軸としてもよい。 What has been developed as a result of the study is a fuel filler opening provided in the fuel filler body connected to the fuel tank, which has a guide opening that guides the fuel nozzle inserted from the fuel filler opening, and the guide part is provided by a torsion coil spring. A shutter that is rotated and pressed from below to the opening is provided, and when the shutter is pushed by the fuel nozzle inserted from the fuel filler opening and pivoted downward to open the guide opening, the torsion coil spring is pulled out. An internal torsion coil spring having a small coil diameter is fitted to a support shaft provided in the guide part at an oil supply port of the fuel supply pipe that is pivoted upward by the valve to close the guide part opening, and an external torsion coil spring having a large coil diameter is fitted to the internal torsion coil spring. The inner torsion coil spring and the outer torsion coil spring are attached to the support shaft in a fitting relationship, and the inner torsion coil spring and the outer torsion coil spring are fitted. Coil spring cooperate a shutter closing type fuel supply port is pressed against the guide opening by rotating the shutter from below. The support shaft for fitting the inner torsion coil spring and the outer torsion coil spring in a fitting relationship may be provided in the guide portion separately from the rotation shaft of the shutter, but the rotation shaft of the shutter may be used as the support shaft.

本発明のシャッタ閉蓋形給油口は、嵌め合い関係にある内捻りコイルバネ及び外捻りコイルバネの協働により給油口を閉じる方向にシャッタを付勢する。これにより、両捻りコイルバネがそれぞれ発揮するトルクの合計によりシャッタをガイド部開口に下方から押し付けて、必要十分なシール性を確保できる。しかし、各捻りコイルバネに発生する曲げ応力は個別であるため、各捻りコイルバネの仕様を適切に設定してバネ定数を小さくし、各捻りコイルバネに発生する開放時曲げ応力をそれぞれの許容曲げ応力内に収めることができる。このように、各捻りコイルバネは、バネ定数を小さくすることでそれぞれ開放時曲げ応力を抑制できるにもかかわらず、閉鎖時捩れ角を大きくとる必要がなく、捻ってシャッタをガイド部に取り付ける組付作業は比較的容易に済む。 The shutter closed lid type oil supply port of the present invention urges the shutter in the direction of closing the oil supply port by the cooperation of the internal torsion coil spring and the external torsion coil spring which are in a fitting relationship. As a result, the shutter is pressed against the opening of the guide portion from below by the sum of the torques exerted by the torsion coil springs, and a necessary and sufficient sealing performance can be ensured. However, since the bending stress generated in each torsion coil spring is individual, the spring constant is reduced by appropriately setting the specifications of each torsion coil spring, and the open bending stress generated in each torsion coil spring is within the allowable bending stress. Can fit in. In this way, each torsion coil spring can suppress the bending stress at the time of opening by reducing the spring constant, but it is not necessary to increase the torsion angle at the time of closing. Work is relatively easy.

全くの別部材である内捻りコイルバネ及び外捻りコイルバネを嵌め合いの関係にするには、それぞれをガイド部に組付ける際、内側となる内捻りコイルバネの内作用腕又は内固定腕の少なくとも一方が外捻りコイルバネの内側から半径方向に突出しない必要がある。これから、外捻りコイルバネは線材の巻き方向に延在する外固定腕及び外作用腕を有し、ガイド部の内面に外固定腕を押し当て、シャッタ下面に外作用腕を押し当て、内捻りコイルバネは前記外捻りコイルバネの内側でシャッタの回動軸の延在方向に突出する内固定腕及び内作用腕を有し、ガイド部の内面に内固定腕を突き刺し、シャッタの回動軸に支持されるシャッタの回動腕に内作用腕を突き刺す構成にするとよい。これにより、内作用腕及び内固定腕のいずれもが邪魔することなく、内捻りコイルバネに外捻りコイルバネを嵌めることができる。 In order to make the internal torsion coil spring and the external torsion coil spring, which are completely separate members, fit to each other, when assembling each to the guide portion, at least one of the inner working arm or the inner fixed arm of the inner torsion coil spring becomes the inner part. It is not necessary to project radially from the inside of the external torsion coil spring. From this, the external torsion coil spring has an outer fixed arm and an outer acting arm that extend in the winding direction of the wire, presses the outer fixed arm against the inner surface of the guide portion, presses the outer acting arm against the lower surface of the shutter, and the inner twist coil spring. Has an inner fixed arm and an inner working arm projecting in the extending direction of the rotating shaft of the shutter inside the outer torsion coil spring, and the inner fixed arm is inserted into the inner surface of the guide portion and supported by the rotating shaft of the shutter. The inner working arm may be inserted into the rotating arm of the shutter. Thus, the external torsion coil spring can be fitted to the internal torsion coil spring without both the inner working arm and the inner fixed arm interfering with each other.

内捻りコイルバネに外捻りコイルバネを嵌めるには、内捻りコイルバネの内作用腕又は内固定腕の少なくとも一方が外捻りコイルバネの内側から半径方向に突出しなければよいので、外捻りコイルバネは線材の巻き方向に延在する外固定腕及び外作用腕を有し、ガイド部の内面に外固定腕を押し当て、シャッタ下面に外作用腕を押し当て、内捻りコイルバネは前記外捻りコイルバネの内側でシャッタの回動軸の延在方向に突出する内固定腕と前記外捻りコイルバネの内側でシャッタの回動軸の延在方向に突出した位置から線材の巻き方向に曲げた内作用腕とを有し、ガイド部の内面に内固定腕を突き刺し、シャッタ下面に内作用腕を押し当てる構成とすることもできる。これにより、内固定腕が邪魔することなく、内捻りコイルバネに外捻りコイルバネを嵌めることができる。 In order to fit the external torsion coil spring to the internal torsion coil spring, at least one of the inner working arm or the inner fixed arm of the inner torsion coil spring does not have to protrude radially from the inner side of the outer torsion coil spring. The outer fixed arm and the outer acting arm extending to the inner surface of the guide portion, pressing the outer fixed arm against the inner surface of the guide portion, pressing the outer acting arm against the lower surface of the shutter, and the inner torsion coil spring inside the outer torsion coil spring. An inner fixed arm protruding in the extending direction of the rotating shaft and an inner working arm bent in the winding direction of the wire from the position protruding in the extending direction of the rotating shaft of the shutter inside the external torsion coil spring; The inner fixed arm may be pierced into the inner surface of the guide portion, and the inner working arm may be pressed against the lower surface of the shutter. Thereby, an external torsion coil spring can be fitted to an internal torsion coil spring without the inner fixed arm interfering.

本発明のシャッタ閉蓋形給油口は、シャッタを閉じる方向に付勢するため、シャッタの回動軸又は前記回動軸と別体の支持軸に対して同軸に嵌める内捻りコイルバネ及び外捻りコイルバネを併用することにより、各捻りコイルバネのバネ定数を小さくして閉鎖時曲げ応力を許容曲げ応力内に収めながら、給油口に求められるシール性に必要なシャッタの付勢を必要十分にする効果がある。具体的には、各捻りコイルバネの閉鎖時曲げ応力を許容曲げ応力内に収めることにより、各捻りコイルバネの破損を防止できる結果、安定したシャッタの開閉を長期にわたって継続できるようになり、シャッタ閉蓋形給油口としての信頼性を高めることができる。また、本発明では各捻りコイルバネのバネ定数を小さくしていることから、各捻りコイルバネの閉鎖時捩れ角をあまり大きくする必要がなく、各捻りコイルバネを捻ってシャッタを給油口又はガイド部に取り付ける組付作業が容易になる。このほか、内捻りコイルバネ及び外捻りコイルバネの併用は、万一一方が破損した場合に他方が残り、最低限給油口を閉じる働きを担保できるフェールセーフの機能を実現する副次的効果をもたらす。 The shutter lid-type oil filler port of the present invention is urged in the closing direction of the shutter, so that the inner twist coil spring and the outer twist coil spring can be fitted coaxially to the rotation shaft of the shutter or the support shaft separate from the rotation shaft. In combination, the spring constant of each torsion coil spring is reduced and the bending stress at the time of closing is kept within the allowable bending stress, while the shutter bias required for the sealing performance required for the fuel filler is necessary and sufficient. is there. Specifically, by keeping the bending stress of each torsion coil spring within the allowable bending stress, the torsion coil spring can be prevented from being damaged. As a result, the shutter can be stably opened and closed over a long period of time. Reliability as a shaped oil filler can be improved. Further, in the present invention, since the spring constant of each torsion coil spring is reduced, it is not necessary to increase the torsion angle when each torsion coil spring is closed, and each torsion coil spring is twisted to attach the shutter to the oil filler opening or the guide portion. Assembly work becomes easy. In addition, the combined use of the internal torsion coil spring and the external torsion coil spring has the secondary effect of realizing a fail-safe function that can ensure the function of closing the fuel filler port at the minimum if one of them is damaged. .

以下、本発明の実施形態について図を参照しながら説明する。図１は本発明を適用した本例のシャッタ閉蓋形給油口を正面方向から見た断面図、図２は本例のシャッタ閉蓋形給油口を背面方向から見た断面図であり、そして図３は本例のシャッタ閉蓋形給油口の分解斜視図である。本例のシャッタ閉蓋形給油口は、説明の便宜上、シャッタ４、内捻りコイルバネ５及び外捻りコイルバネ６を支持する回動軸７の延在方向から見て、前記シャッタ４が右回りに押し下げられて開くように見える側を正面、逆にシャッタ４が左回りに押し下げられて開くように見える側を背面として説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a shutter-closed oil filler port of the present example to which the present invention is applied as viewed from the front direction, and FIG. 2 is a cross-sectional view of the shutter-closed fuel filler port of the present example as viewed from the rear side. FIG. 3 is an exploded perspective view of the shutter-closed oil filler opening of this example. The shutter-closed oil filler opening of this example is pushed down clockwise as viewed from the extending direction of the rotating shaft 7 that supports the shutter 4, the inner torsion coil spring 5, and the outer torsion coil spring 6 for convenience of explanation. The side that appears to be opened will be described as the front side, and conversely, the side that appears to open when the shutter 4 is pushed counterclockwise will be described as the back side.

本例のシャッタ閉蓋形給油口は、図１〜図３に見られるように、燃料タンク（図示略）に接続した給油管本体13の開放端に設けた給油口ケース本体１と、前記給油口ケース本体１に嵌める給油口ケース蓋２と、前記給油口ケース本体１内に収納されるガイド部３とから構成される。ガイド部３は、シャッタ４，内捻りコイルバネ５、外捻りコイルバネ６及び回動軸７を組み付ける下ガイドブロック31と、前記下ガイドブロック31に設けられた一対の軸支持柱312,312に上方から挿入された回動軸７を押さえ付けると共に、シャッタ４により閉鎖されるガイド部開口321をガイド部３に形成する上ガイドブロック32とから構成される。 As shown in FIGS. 1 to 3, the shutter-closed type fuel filler of this example includes a fuel filler case main body 1 provided at an open end of a fuel filler pipe main body 13 connected to a fuel tank (not shown), and the fuel filler. It is comprised from the oil filler case cover 2 fitted to the mouth case main body 1, and the guide part 3 accommodated in the said oil filler case main body 1. FIG. The guide portion 3 is inserted from above into a lower guide block 31 for assembling the shutter 4, the inner torsion coil spring 5, the outer torsion coil spring 6 and the rotating shaft 7, and a pair of shaft support columns 312 and 312 provided in the lower guide block 31. The upper guide block 32 that presses the rotating shaft 7 and that forms a guide portion opening 321 in the guide portion 3 that is closed by the shutter 4.

給油口ケース本体１は、給油管本体13の開口端に設けられる金属製の円筒ケースであり、90度間隔で半径方向内向きに突出した４個の下位置決め凸部11と、同じ90度間隔で半径方向外向きに突出した３個の上位置決め凹部12とをそれぞれ壁面に形成している。下位置決め凸部11は、ガイド部３を構成する上ガイドブロック32の外面に形成した４個所の下位置決め溝部324を嵌合させ、給油口ケース本体１に対するガイド部３の組付に利用する。給油口ケース蓋２は、給油口ケース本体１に収納したガイド部３を外界から隠して保護すると共に、給油ノズル８（図13参照）を差し込む給油口開口22を形成する。給油口ケース蓋２は、壁面に形成した半径方向外向きに突出した３個の上位置決め凸部21を、給油口ケース本体１の上位置決め凹部12に嵌合させて、前記給油口ケース本体１と組み付ける。 The oil filler case body 1 is a metal cylindrical case provided at the open end of the oil supply pipe body 13, and is located at the same 90 degree intervals as the four lower positioning protrusions 11 projecting radially inward at 90 degree intervals. And three upper positioning recesses 12 projecting outward in the radial direction are formed on the wall surface. The lower positioning convex portion 11 is fitted to four lower positioning groove portions 324 formed on the outer surface of the upper guide block 32 constituting the guide portion 3 and is used for assembling the guide portion 3 to the fuel filler case body 1. The fuel filler case cover 2 conceals and protects the guide portion 3 housed in the fuel filler case main body 1 from the outside and forms a fuel filler opening 22 into which the fuel filler nozzle 8 (see FIG. 13) is inserted. The fuel filler case lid 2 is formed by fitting three upper positioning convex portions 21 projecting radially outwardly formed on the wall surface into the upper positioning concave portion 12 of the fuel filler case main body 1, thereby And assembled.

ガイド部３を構成する下ガイドブロック31は、組み付けた上ガイドブロック32と共に、給油口ケース本体１に収納される略円筒状の樹脂ブロックであり、前記上ガイドブロック32の内側に嵌め込んで組み付ける。この下ガイドブロック31は、底面に給油管本体13に通ずる連通口311を開口し、壁面から上方に延びる軸支持柱312,312を正面及び背面に対向させて設けている。連通口311は、給油口ケース本体１に収納した際、前記給油口ケース本体１の給油管本体13と同軸になる位置に開口している。正面側の軸支持柱312は、回動軸７を嵌め込む軸受け溝318のほか、内捻りコイルバネ５の内固定腕51を差し込んで保持する差込み溝313を上面から下方に向けて形成している。また、背面側の軸支持柱312は、回動軸７を嵌め込む軸受け溝318のほか、内捻りコイルバネ５の外作用腕62との干渉を避ける円弧切欠314を上面から下方に向けて形成している。 The lower guide block 31 constituting the guide portion 3 is a substantially cylindrical resin block housed in the fuel filler case main body 1 together with the assembled upper guide block 32, and is fitted and assembled inside the upper guide block 32. . The lower guide block 31 has a communication port 311 that communicates with the oil supply pipe body 13 on the bottom surface, and shaft support columns 312 and 312 that extend upward from the wall surface are provided facing the front and back surfaces. The communication port 311 opens at a position that is coaxial with the fuel supply pipe body 13 of the fuel supply case main body 1 when housed in the fuel supply case main body 1. The shaft support column 312 on the front side is formed with an insertion groove 313 for inserting and holding the inner fixing arm 51 of the internal torsion coil spring 5 from the upper surface downward, in addition to the bearing groove 318 into which the rotating shaft 7 is fitted. . The shaft support column 312 on the back side is formed with a bearing groove 318 in which the rotating shaft 7 is fitted, and an arc notch 314 that avoids interference with the externally acting arm 62 of the internal torsion coil spring 5 from the upper surface downward. ing.

本例の下ガイドブロック31は、シャッタ４のシャッタ本体42から突出する規制突片422に上方から係合してシャッタ４の開閉範囲を規制する断面鉤状の閉鎖時ストッパ316を、壁面から上方に向けて延設している。また、シャッタ４が給油ノズル８（図13参照）に押されて開いた際、シャッタ本体42のシャッタ下面421に当接してシャッタ４の開閉範囲を規制する凸部からなる開放時ストッパ317を、底面に設けている。この下ガイドブロック31は、上ガイドブロック32と共に、給油口ケース本体１の給油管本体13と給油口ケース蓋２の給油口開口22とを結ぶ給油経路を構成するから、組み付ける上ガイドブロック32との間にシール性を確保する必要がある。このため、本例の下ガイドブロック31は、壁面の外周下縁に当接フランジ315を設け、上ガイドブロック32のパッキン溝322に嵌めたシールパッキン33を前記当接フランジ315に押し付けている。 The lower guide block 31 in this example is provided with a closing stopper 316 having a bowl-shaped cross section that engages with a restriction protrusion 422 protruding from the shutter body 42 of the shutter 4 from above and restricts the opening / closing range of the shutter 4. It is extended toward. Further, when the shutter 4 is pushed and opened by the fuel supply nozzle 8 (see FIG. 13), an opening stopper 317 made of a convex portion that contacts the shutter lower surface 421 of the shutter main body 42 and restricts the opening / closing range of the shutter 4 is provided. Provided on the bottom. The lower guide block 31 and the upper guide block 32 form an oil supply path connecting the oil supply pipe body 13 of the oil supply port case body 1 and the oil supply port opening 22 of the oil supply port case lid 2. It is necessary to ensure a sealing property between the two. For this reason, the lower guide block 31 of this example is provided with a contact flange 315 at the outer peripheral lower edge of the wall surface, and the seal packing 33 fitted in the packing groove 322 of the upper guide block 32 is pressed against the contact flange 315.

ガイド部３を構成する上ガイドブロック32は、組み付けた下ガイドブロック31と共に、給油口ケース本体１に収納される略円筒状の樹脂ブロックであり、前記下ガイドブロック31の外側に被せて組み付ける。この上ガイドブロック32は、上面に給油口開口22に通ずるガイド部開口321を開口し、壁面内側に沿って延びる位置決めリブ323を５本設けている。ガイド部開口321は、下ガイドブロック31及び上ガイドブロック32を組み付けた際、前記下ガイドブロック31の連通口311と同軸になる位置に開口しており、給油口開口22から差し込んだ給油ノズル８（図13参照）を正しく給油管本体13へ導くため、上端面が広く、下端面が狭い漏斗様断面を形成している。シャッタ４は、シャッタ本体42を前記ガイド部開口321の下端面に下方から押し付けて、給油経路を閉鎖する。 The upper guide block 32 that constitutes the guide portion 3 is a substantially cylindrical resin block that is housed in the fuel filler case main body 1 together with the assembled lower guide block 31. The upper guide block 32 is assembled to cover the outer side of the lower guide block 31. The upper guide block 32 has a guide portion opening 321 communicating with the oil filler opening 22 on the upper surface, and five positioning ribs 323 extending along the inner surface of the wall surface. The guide opening 321 is opened at a position coaxial with the communication port 311 of the lower guide block 31 when the lower guide block 31 and the upper guide block 32 are assembled. The oil supply nozzle 8 inserted through the oil supply opening 22 In order to correctly guide (see FIG. 13) to the oil supply pipe body 13, a funnel-like cross section is formed with a wide upper end surface and a narrow lower end surface. The shutter 4 presses the shutter main body 42 against the lower end surface of the guide opening 321 from below to close the oil supply path.

本例の上ガイドブロック32は、既述したように、給油口ケース本体１に対して組み付けるため、前記給油口ケース本体１に形成した下位置決め凸部11に対応して、90度間隔で半径方向内向きに凹ませた下位置決め溝部324を形成している。また、下ガイドブロック31に設けた当接フランジ315に押し付けるシールパッキン33を嵌め込み、保持するパッキン溝322を、底面の外周に沿って形成している。前記パッキン33は、上下に長い楕円に内フランジを一体に設けた断面略楕円のゴム製で、前記楕円部分がパッキン溝322内で押し潰され、前記パッキン溝322及び当接フランジ315に押し当てられることで、シール性を発揮する。 As described above, the upper guide block 32 of this example has a radius of 90 degrees corresponding to the lower positioning convex portion 11 formed on the fuel filler case body 1 in order to be assembled to the fuel filler case body 1. A lower positioning groove 324 is formed that is recessed inwardly in the direction. In addition, a seal groove 33 that is pressed into a contact flange 315 provided in the lower guide block 31 is fitted and held to form a packing groove 322 along the outer periphery of the bottom surface. The packing 33 is made of rubber having a substantially elliptical cross section in which an inner flange is integrally provided in a vertically long ellipse. The elliptical portion is crushed in the packing groove 322 and pressed against the packing groove 322 and the contact flange 315. By doing so, it exhibits sealing properties.

上ガイドブロック32の位置決めリブ323は、下ガイドブロック31の壁面上面に突き当てられ、下ガイドブロック31及び上ガイドブロック32の組付関係を特定すると共に、給油口ケース本体１の下位置決め凸部11に下位置決め溝部324を嵌合させることで組み付ける上ガイドブロック32を介して下ガイドブロック31を押さえ付ける部分である。そして、下ガイドブロック31の各軸支持柱312,312は、上方に開放された軸受け溝318が上ガイドブロック32の上面が押し当てられることで塞がれ、回動軸７を安定に保持できるようになっている。このように、ネジ等を用いず、部材相互の嵌合だけによって組み付けられ、更に上ガイドブロック32の押さえ付けてシールパッキン33のシール性を確保したり、回動軸７を安定に保持する本例のシャッタ閉蓋形給油口は、組付が容易になっており、生産性を向上させる効果を有している。 The positioning rib 323 of the upper guide block 32 is abutted against the upper surface of the wall surface of the lower guide block 31 and specifies the assembly relationship between the lower guide block 31 and the upper guide block 32, and the lower positioning convex portion of the fuel filler case body 1 11 is a portion that presses the lower guide block 31 through the upper guide block 32 that is assembled by fitting the lower positioning groove portion 324 to 11. The shaft support columns 312 and 312 of the lower guide block 31 are blocked by the upper surface of the upper guide block 32 being pressed by the bearing grooves 318 opened upward so that the rotating shaft 7 can be stably held. It has become. In this way, the screw is not assembled, and is assembled only by fitting the members together. Further, the upper guide block 32 is pressed down to ensure the sealing performance of the seal packing 33, and the rotating shaft 7 is stably held. The shutter closing lid type oil filler in the example is easy to assemble and has the effect of improving productivity.

シャッタ４は、上ガイドブロック32のガイド部開口321を下方から宛てがって塞ぐシャッタ本体42と、前記シャッタ本体42から同一方向に延ばした左右一対の回動腕41と、前記回動腕41に挟まれた範囲で前記シャッタ本体42から延ばした倣い板423とを一体成形した樹脂成形品である。シャッタ本体42の下面が、外捻りコイルバネ６の外作用腕62を押し当てるシャッタ下面421となる。また、背面側の回動腕41には、内捻りコイルバネ５の内作用腕52を差し込む差込み孔411を設けている。前記内捻りコイルバネ５の内作用腕52は、外捻りコイルバネ６のコイル径内で突出しているから、前記回動腕41の差込み孔411も外捻りコイルバネ６のコイル径内に設けられる。 The shutter 4 includes a shutter main body 42 that covers and guides the guide opening 321 of the upper guide block 32 from below, a pair of left and right rotating arms 41 extending in the same direction from the shutter main body 42, and the rotating arms 41. This is a resin molded product in which a copying plate 423 extending from the shutter main body 42 is integrally molded in a range sandwiched between the two. The lower surface of the shutter body 42 becomes the shutter lower surface 421 that presses the externally acting arm 62 of the external torsion coil spring 6. Further, the rotation arm 41 on the back side is provided with an insertion hole 411 into which the internal working arm 52 of the internal torsion coil spring 5 is inserted. Since the inner working arm 52 of the inner torsion coil spring 5 protrudes within the coil diameter of the outer torsion coil spring 6, the insertion hole 411 of the rotating arm 41 is also provided within the coil diameter of the outer torsion coil spring 6.

倣い板423は、組み付け時に内捻りコイルバネ５及び外捻りコイルバネ６が落下することを防止するほか、組み付け後に外捻りコイルバネ６を支えて、内捻りコイルバネ５と擦れ合いを防止する。このシャッタ４は、閉鎖時のシール性を確保する必要からガイド部開口321周縁に押し付けられるシールリング43をシャッタ本体42に嵌めている。そして、前記シールリング43が正しくガイド部開口321周縁に押し付けられるように、閉鎖時に前記ガイド部開口321へ嵌め込まれる嵌入凸部424をシャッタ本体42の上面に形成し、前記嵌入凸部424がガイド部開口321に正しく嵌め込まれることで、シールリング43が正しくガイド部開口321周縁に押し付けられるようにしている。本例の嵌入凸部424は、ガイド部開口321に倣った円柱状で、回動軸７に近い側を下り勾配の斜面としている。 The copying plate 423 prevents the inner torsion coil spring 5 and the outer torsion coil spring 6 from dropping during assembly, and supports the outer torsion coil spring 6 after assembly to prevent friction with the inner torsion coil spring 5. In the shutter 4, a seal ring 43 that is pressed against the periphery of the guide opening 321 is fitted to the shutter main body 42 because it is necessary to ensure a sealing property when closed. Then, an insertion convex portion 424 that is fitted into the guide portion opening 321 when closed is formed on the upper surface of the shutter body 42 so that the seal ring 43 is correctly pressed against the periphery of the guide portion opening 321, and the insertion convex portion 424 is a guide. The seal ring 43 is correctly pressed against the periphery of the guide opening 321 by being properly fitted into the opening 321. The insertion convex part 424 of this example is a cylindrical shape following the guide part opening 321, and the side close to the rotating shaft 7 is a slope with a downward slope.

回動軸７は、シャッタ４の回動腕41を貫通し、両端が下ガイドブロック31に設けた軸支持柱312それぞれの軸受け溝318に差し込まれ、支持される。本例は前記回動軸７を支持軸とし、内捻りコイルバネ５を前記回動軸７に嵌め、前記内捻りコイルバネ５に外捻りコイルバネ６を嵌めて、内捻りコイルバネ５及び外捻りコイルバネ６を嵌め合いの関係で前記回動軸７に装着している。シャッタ４，外捻りコイルバネ６、内捻りコイルバネ５及び回動軸７の組付手順は自由である。例えば、回動軸７に内捻りコイルバネ５を嵌めた後、前記内捻りコイルバネ５に外捻りコイルバネを嵌め合い関係で嵌めてもよいし、逆に回動軸７に外捻りコイルバネ６を嵌めた後、内捻りコイルバネ５を回動軸７と外捻りコイルバネ６との間に差し込むこともできる。 The rotation shaft 7 penetrates the rotation arm 41 of the shutter 4 and both ends thereof are inserted into and supported by the bearing grooves 318 of the shaft support columns 312 provided in the lower guide block 31. In this example, the rotation shaft 7 is used as a support shaft, an inner torsion coil spring 5 is fitted to the rotation shaft 7, an outer torsion coil spring 6 is fitted to the inner torsion coil spring 5, and the inner torsion coil spring 5 and the outer torsion coil spring 6 are connected. The rotating shaft 7 is attached because of the fitting. The assembly procedure of the shutter 4, the outer torsion coil spring 6, the inner torsion coil spring 5, and the rotating shaft 7 is arbitrary. For example, after the inner torsion coil spring 5 is fitted to the rotating shaft 7, the outer torsion coil spring may be fitted to the inner torsion coil spring 5 in a fitting relationship, or conversely, the outer torsion coil spring 6 is fitted to the rotating shaft 7. Thereafter, the inner torsion coil spring 5 can be inserted between the rotating shaft 7 and the outer torsion coil spring 6.

外捻りコイルバネ６は、線材の巻き方向に延在する外固定腕61及び外作用腕62を有する。外固定腕61は、一方の巻き端の線材から巻き方向に延在させた後、他方の巻き端に向けて１段階に折り曲げたＬ字状（後掲図８右側参照）で、シャッタ４の回動腕41及び倣い板423の隙間から降ろして全体を下ガイドブロック31の壁面内側に押し当てる。外作用腕62は、他方の巻き端の線材から巻き方向に延在させた後、一方の巻き端に向けて２段階に折り曲げて斜めに延ばした変形Ｌ字状（後掲図８左側参照）で、端部をシャッタ４のシャッタ下面421の中央に押し当てている（後掲図６参照）。内捻りコイルバネ５は、外捻りコイルバネ６の内側で回動軸７の延在方向に突出する内固定腕51及び内作用腕52を有する。内固定腕51は、一方の巻き端の線材から半径方向に突出させた後、回動軸７の延在方向に突出させたＬ字状（後掲図７右側参照）で、下ガイドブロック31に設けた正面側の軸支持柱312の差込み溝313に突き刺す。内作用腕52は、他方の巻き端の線材の円周上から回動軸７の延在方向に突出させた棒状（後掲図７左側参照）で、シャッタ４が有する背面側の回動腕41に設けた差込み孔411に突き刺している。 The external torsion coil spring 6 has an external fixed arm 61 and an external action arm 62 that extend in the winding direction of the wire. The outer fixed arm 61 extends in the winding direction from the wire rod at one winding end and is bent in one step toward the other winding end (see the right side of FIG. 8 below). The whole is lowered from the gap between the rotating arm 41 and the copying plate 423 and pressed against the inner surface of the lower guide block 31. The externally acting arm 62 extends from the wire at the other winding end in the winding direction, and then bends in two stages toward the one winding end and extends obliquely (see the left side of FIG. 8 below). Thus, the end is pressed against the center of the shutter lower surface 421 of the shutter 4 (see FIG. 6 described later). The inner torsion coil spring 5 has an inner fixed arm 51 and an inner working arm 52 that protrude in the extending direction of the rotation shaft 7 inside the outer torsion coil spring 6. The inner fixed arm 51 is L-shaped (see the right side of FIG. 7) and protrudes in the extending direction of the rotating shaft 7 after protruding in the radial direction from the wire rod at one winding end. Is inserted into the insertion groove 313 of the shaft support column 312 on the front side. The inner working arm 52 is a rod-like shape (see the left side of FIG. 7 described later) protruding in the extending direction of the rotating shaft 7 from the circumference of the wire rod at the other winding end, and the rotating arm on the rear side of the shutter 4. The insertion hole 411 provided in 41 is pierced.

外捻りコイルバネ６の外固定腕61は下ガイドブロック31の壁面内側に押し付けられ、また内捻りコイルバネ５の外固定腕61は軸支持柱312の差込み溝313に差し込まれて、それぞれ位置固定されている。そして、後述するように、シャッタ４のシャッタ下面421に押し当てられた外捻りコイルバネ６の外作用腕62と、シャッタ４の回動腕41の差込み孔411に差し込まれた内捻りコイルバネ５の内作用腕52は、前記シャッタ４に従い、正面から見て右回りに外作用腕62を捻られるので、内捻りコイルバネ５及び外捻りコイルバネ６は協働してシールリング43をガイド部開口321に押し付ける方向にシャッタ４を付勢する。 The outer fixed arm 61 of the outer torsion coil spring 6 is pressed against the inside of the wall surface of the lower guide block 31, and the outer fixed arm 61 of the inner torsion coil spring 5 is inserted into the insertion groove 313 of the shaft support column 312 and fixed in position. Yes. Then, as will be described later, the inside of the externally acting coil spring 6 pressed against the shutter lower surface 421 of the shutter 4 and the internal twisted coil spring 5 inserted into the insertion hole 411 of the rotating arm 41 of the shutter 4. The working arm 52 can twist the external working arm 62 clockwise in accordance with the shutter 4 as viewed from the front, so that the inner torsion coil spring 5 and the outer torsion coil spring 6 cooperate to press the seal ring 43 against the guide opening 321. The shutter 4 is urged in the direction.

図４はシャッタ４を組み付けた下ガイドブロック31の正面図、図５はシャッタ４を組み付けた下ガイドブロック31を正面方向から見た断面図、図６はシャッタ４を組み付けた下ガイドブロック31の平面図、図７は無負荷時の内捻りコイルバネ５を背面方向から見た斜視図、図８は無負荷時の外捻りコイルバネ６を背面方向から見た斜視図、図９はシャッタ４の閉鎖時を表すガイド部３を正面方向から見た断面図、図10はシャッタ４の閉鎖時を表すガイド部３の平面図、図11はシャッタ４の閉鎖時の内捻りコイルバネ５を背面方向から見た斜視図、図12はシャッタ４の閉鎖時の外捻りコイルバネ６を背面方向から見た斜視図、図13はシャッタ４の開放時を表すガイド部３を正面方向から見た断面図、図14はシャッタ４の開放時を表すガイド部３の平面図、図15はシャッタ４の開放時の内捻りコイルバネ５を背面方向から見た斜視図であり、そして図16はシャッタ４の開放時の外捻りコイルバネ６を背面方向から見た斜視図である。 4 is a front view of the lower guide block 31 to which the shutter 4 is assembled, FIG. 5 is a sectional view of the lower guide block 31 to which the shutter 4 is assembled, viewed from the front, and FIG. 6 is a view of the lower guide block 31 to which the shutter 4 is assembled. FIG. 7 is a perspective view of the inner torsion coil spring 5 when viewed from the rear side, FIG. 8 is a perspective view of the outer torsion coil spring 6 when viewed from the rear direction, and FIG. FIG. 10 is a plan view of the guide portion 3 when the shutter 4 is closed, and FIG. 11 is a plan view of the internal torsion coil spring 5 when the shutter 4 is closed. FIG. 12 is a perspective view of the external torsion coil spring 6 when the shutter 4 is closed as viewed from the back, FIG. 13 is a cross-sectional view of the guide portion 3 when the shutter 4 is opened as viewed from the front, and FIG. Is the plane of the guide portion 3 representing the shutter 4 when it is opened FIGS. 15A and 15B are perspective views of the inner torsion coil spring 5 as viewed from the back when the shutter 4 is opened, and FIG. 16 is a perspective view of the outer torsion coil spring 6 as viewed from the back when the shutter 4 is opened. .

図４〜図６に見られるように、シャッタ４、外捻りコイルバネ６、内捻りコイルバネ５及び回動軸７を下ガイドブロック31に組み付けると、図８に見られるように、無負荷時の外捻りコイルバネ６は外固定腕61を垂下させて下ガイドブロック31の壁面内側に押し当てると、外作用腕62を正面から見て斜め左上に跳ね上げる。同様に、図７に見られるように、無負荷時の内捻りコイルバネ５は内固定腕51を最も高い位置として下ガイドブロック31の軸支持柱312の差込み溝313に差し込まれ、内作用腕52を正面から見て斜め右上の位置とする（図６参照）。外作用腕62はシャッタ下面421に宛てがわれているだけであるが、内作用腕52が回動腕41の差込み孔411に差し込まれているため、シャッタ４は前記外作用腕62に倣って、正面から見て斜め左上に跳ね上げられた姿勢に保持される。これは、シャッタ４、外捻りコイルバネ６、内捻りコイルバネ５及び回動軸７を下ガイドブロック31に組み付けた際、シャッタ４を勝手に回動させない利点がある。 4 to 6, when the shutter 4, the outer torsion coil spring 6, the inner torsion coil spring 5 and the rotating shaft 7 are assembled to the lower guide block 31, as shown in FIG. When the outer fixed arm 61 is suspended and pressed against the inner wall surface of the lower guide block 31, the torsion coil spring 6 springs up the outer acting arm 62 diagonally to the upper left when viewed from the front. Similarly, as shown in FIG. 7, the inner torsion coil spring 5 when no load is applied is inserted into the insertion groove 313 of the shaft support column 312 of the lower guide block 31 with the inner fixed arm 51 at the highest position, and the inner working arm 52 Is a diagonally upper right position when viewed from the front (see FIG. 6). The outer acting arm 62 is only directed to the shutter lower surface 421, but the inner working arm 52 is inserted into the insertion hole 411 of the rotating arm 41, so that the shutter 4 follows the outer acting arm 62. , When held from the front, it is held in a posture that is slanted to the upper left. This is advantageous in that the shutter 4 is not arbitrarily rotated when the shutter 4, the external torsion coil spring 6, the internal torsion coil spring 5 and the rotation shaft 7 are assembled to the lower guide block 31.

図９及び図10に見られるように、シャッタ４を正面から見て右回りに回して下ガイドブロック31に上ガイドブロック32を被せて組み付けると、シャッタ４が上ガイドブロック32のガイド部開口321に下方から押し付けられた閉鎖状態となる。この閉鎖状態では、下ガイドブロック31の連通口311と上ガイドブロック32のガイド部開口321との連通をシャッタ４が遮断する。このようにシャッタ４を閉鎖状態にすると、図11及び図12に見られるように、内作用腕52及び外作用腕62も正面から見て右回りに大きく捻られる結果、内捻りコイルバネ５及び外捻りコイルバネ６に閉鎖時曲げ応力が発生する。ここで、内捻りコイルバネ５及び外捻りコイルバネ６の閉鎖時捩れ角α（図11及び図12中白抜き矢印で図示）は等しいが、それぞれバネ定数を決定する線材の太さ、コイル径及び巻き数が異なるため、発生する閉鎖時曲げ応力はそれぞれ異なる。しかし。従来のように、１つの捻りコイルバネだけを用いる場合に比べ、内捻りコイルバネ５及び外捻りコイルバネ６それぞれに発生する閉鎖時曲げ応力は低く抑えることができる。 As shown in FIGS. 9 and 10, when the shutter 4 is rotated clockwise when viewed from the front and the lower guide block 31 is covered with the upper guide block 32 and assembled, the shutter 4 is guided to the guide portion opening 321 of the upper guide block 32. The closed state is pressed from below. In this closed state, the shutter 4 blocks communication between the communication port 311 of the lower guide block 31 and the guide portion opening 321 of the upper guide block 32. When the shutter 4 is closed as described above, as shown in FIGS. 11 and 12, the inner working arm 52 and the outer acting arm 62 are also largely twisted clockwise as viewed from the front. Bending stress is generated in the torsion coil spring 6 when closed. Here, the torsion angle α when closed (indicated by white arrows in FIGS. 11 and 12) of the inner torsion coil spring 5 and the outer torsion coil spring 6 is equal, but the wire thickness, coil diameter, and winding that determine the spring constant, respectively. Since the numbers are different, the bending stresses generated at the time of closure are different. However. As compared with the conventional case where only one torsion coil spring is used, the bending stress at the time of closing generated in each of the inner torsion coil spring 5 and the outer torsion coil spring 6 can be kept low.

図13及び図14に見られるように、給油ノズル８を上ガイドブロック32のガイド部開口321から下ガイドブロック31の連通口311に向けて挿入すると、給油ノズル８が内捻りコイルバネ５及び外捻りコイルバネ６の付勢に抗してシャッタ４を正面から見て右回りに下方へ回動させる。シャッタ４は、嵌入凸部424を給油ノズル８に当接させて姿勢を保持され、下ガイドブロック31の連通口311と上ガイドブロック32のガイド部開口321とが前記給油ノズル８により連通する。そして、図15及び図16に見られるように、シャッタ４の回動に従って内作用腕52及び外作用腕62も正面から見て右回りに捻られ、内捻りコイルバネ５及び外捻りコイルバネ６に発生していた閉鎖時曲げ応力が開放時曲げ応力まで増大する。上述同様、内捻りコイルバネ５及び外捻りコイルバネ６の開放時捩れ角β（図15及び図16中白抜き矢印で図示）は等しいが、それぞれバネ定数が異なるため、発生する開放時曲げ応力も異なるが、各開放時曲げ応力は内捻りコイルバネ５及び外捻りコイルバネ６それぞれの許容曲げ応力内に抑えることができる。 As shown in FIGS. 13 and 14, when the oil supply nozzle 8 is inserted from the guide portion opening 321 of the upper guide block 32 toward the communication port 311 of the lower guide block 31, the oil supply nozzle 8 is turned into the inner twist coil spring 5 and the outer twist. The shutter 4 is rotated clockwise as viewed from the front against the bias of the coil spring 6. The posture of the shutter 4 is maintained by bringing the fitting convex portion 424 into contact with the oil supply nozzle 8, and the communication port 311 of the lower guide block 31 and the guide portion opening 321 of the upper guide block 32 communicate with each other through the oil supply nozzle 8. As shown in FIGS. 15 and 16, the inner working arm 52 and the outer working arm 62 are also twisted clockwise as viewed from the front according to the rotation of the shutter 4, and are generated in the inner torsion coil spring 5 and the outer torsion coil spring 6. The bending stress at closing increases to the bending stress at opening. As described above, the torsion angle β (indicated by white arrows in FIGS. 15 and 16) of the inner torsion coil spring 5 and the outer torsion coil spring 6 is the same, but the spring constants are different from each other. However, the bending stress at the time of opening can be suppressed within the allowable bending stress of each of the inner torsion coil spring 5 and the outer torsion coil spring 6.

給油ノズル８を引き抜くと、シャッタ４は正面から見て左回りに上方へ回動し、再びガイド部開口321に下方から押し当てられ、内捻りコイルバネ５及び外捻りコイルバネ６の働きにより、図９及び図10に見られる閉鎖状態に復帰する。本発明における内捻りコイルバネ５及び外捻りコイルバネ６それぞれの開放時曲げ応力は個別に許容曲げ応力内に収めながら、シャッタ４をガイド部開口321に押し付けるは両者のモーメントの和が働くため、シャッタ４のシールリング43をガイド部開口321周縁に押し付けて、必要十分なシール性を確保できる。そして、内捻りコイルバネ５及び外捻りコイルバネ６それぞれの開放時曲げ応力が許容曲げ応力内に収まっているため、両者を破損させることなく、前記シール性を永続的に発揮できる。更に、仮に内捻りコイルバネ５又は外捻りコイルバネ６のいずれかが破損しても、他方がシャッタ４をガイド部開口321に押し付けるため、最低限ガイド部開口321を閉鎖できるフェールセーフが実現されている。 When the oil supply nozzle 8 is pulled out, the shutter 4 rotates counterclockwise upward as viewed from the front, and is again pressed against the guide opening 321 from below, and the action of the internal torsion coil spring 5 and the external torsion coil spring 6 causes And it returns to the closed state seen in FIG. The shutter 4 is pressed against the guide opening 321 while the opening bending stresses of the inner torsion coil spring 5 and the outer torsion coil spring 6 are individually within the allowable bending stress in the present invention. This seal ring 43 can be pressed against the periphery of the guide opening 321 to ensure the necessary and sufficient sealing performance. And since the bending stress at the time of opening of each of the inner torsion coil spring 5 and the outer torsion coil spring 6 is within the allowable bending stress, the sealing performance can be exhibited permanently without damaging both. Furthermore, even if either the internal torsion coil spring 5 or the external torsion coil spring 6 is damaged, the other presses the shutter 4 against the guide opening 321, so that a fail-safe that can at least close the guide opening 321 is realized. .

図17は別例のシャッタ閉蓋形給油口を背面方向から見た断面図であり、そして図18は別例におけるシャッタ４を組み付けた下ガイドブロック31の平面図である。この別例のシャッタ閉蓋形給油口は、内捻りコイルバネ５に外捻りコイルバネ６を嵌めるため、内捻りコイルバネ５の内固定腕51を上記例示（図１〜図16参照）同様に外捻りコイルバネ６の内側から半径方向に突出させながら、図18に見られるように、内作用腕52を外捻りコイルバネ６の外作用腕62に沿って線材の巻き方向に突出させた構成である。このため、内捻りコイルバネ５と、上記例示で回動軸７の延在方向に突出させた内作用腕61との緩衝を避ける円弧切欠314（図３参照）のない軸支持柱312を構成した下ガイドブロック31とを除き、図17に見られるように、各部品は上記例示と共通に用いることができる。 FIG. 17 is a cross-sectional view of another example of the shutter-closed type fuel filler port as viewed from the rear side, and FIG. 18 is a plan view of the lower guide block 31 in which the shutter 4 of another example is assembled. In this other example of the shutter-closed type oil filler opening, the outer torsion coil spring 6 is fitted to the inner torsion coil spring 5, so that the inner fixing arm 51 of the inner torsion coil spring 5 is the outer torsion coil spring as in the above example (see FIGS. 1 to 16). 18, the inner working arm 52 is projected in the winding direction of the wire along the outer acting arm 62 of the external torsion coil spring 6 as seen in FIG. For this reason, the shaft support column 312 without the arc notch 314 (see FIG. 3) is constructed to avoid buffering between the internal torsion coil spring 5 and the internal working arm 61 protruding in the extending direction of the rotating shaft 7 in the above example. Except for the lower guide block 31, as shown in FIG. 17, each component can be used in common with the above example.

この別例のシャッタ閉蓋形給油口では、内捻りコイルバネ５の内作用腕52が線材の巻き方向に突出していることから、内捻りコイルバネ５に対する外捻りコイルバネ６の嵌め合いは、内固定腕51の側からに限られることになるが、こうした組付の制限はほとんど支障はない。むしろ、内捻りコイルバネ５の内作用腕52が外捻りコイルバネ６の外作用腕62に沿って延び、シャッタ４の下面421にほぼ等しく押し付けられることから、両捻りコイルバネ５,６が等価かつ安定してシャッタ４の開閉に寄与できるようになり、好ましい利点が得られる。また、軸支持柱312に円弧切欠314（図３参照）がないために、回動軸７を受ける軸受けが大きくなり、軸支持柱312としての構造強度を高めることのできる利点も得られる。 In this other example of the shutter-closed type oil filler opening, the inner working arm 52 of the inner torsion coil spring 5 protrudes in the winding direction of the wire, so that the outer torsion coil spring 6 is fitted to the inner torsion coil spring 5 with the inner fixed arm. Although it will be limited from the side of 51, these restrictions on assembly are almost no hindrance. Rather, since the inner acting arm 52 of the inner torsion coil spring 5 extends along the outer acting arm 62 of the outer torsion coil spring 6 and is almost equally pressed against the lower surface 421 of the shutter 4, the torsion coil springs 5 and 6 are equivalent and stable. Thus, it is possible to contribute to the opening and closing of the shutter 4, and a preferable advantage is obtained. In addition, since the shaft support column 312 does not have the circular arc notch 314 (see FIG. 3), the bearing that receives the rotating shaft 7 becomes large, and there is an advantage that the structural strength as the shaft support column 312 can be increased.

本発明の内捻りコイルバネ及び外捻りコイルバネを具体的に組み合せた実施例の閉鎖時曲げ応力σ1及び開放時曲げ応力σ2を試算し、１つの捻りコイルバネだけを用いる従来例と比較した。実施例及び従来例に共通な条件として、上記例示（図１〜図16参照）の給油口を対象とし、捻りコイルバネを収めるガイド部の空間は、縦（図１中図面上下方向長さ）及び横（図１中図面左右方向長さ）を15mm弱、奥行き（図１中紙面直交方向長さ）を40mm弱とした。また、実施例及び従来例の捻りコイルバネそれぞれは同じステンレス製（SUS304-WPB製）とし、各捻りコイルバネの縦弾性係数Ｅを192080Ｎ/mm²（19600kgf/mm²とするほか、各捻りコイルバネの応力係数Ｋは1.12、閉鎖時捻り角αは150度、開放時捻り角βは230度として揃えた。そして、閉鎖時のシャッタに要求されるシール性（シール性要求）を満足するように、閉鎖時トルクＭ1が900Ｎ・mm（91.8kgf・mm）以上になるように、実施例及び従来例の各捻りコイルバネの仕様を決定した。 The bending stress σ1 at the time of closing and the bending stress σ2 at the time of opening of the embodiment in which the inner torsion coil spring and the outer torsion coil spring according to the present invention were specifically combined were estimated and compared with the conventional example using only one torsion coil spring. As a condition common to the embodiment and the conventional example, the space of the guide portion for accommodating the torsion coil spring is the vertical (length in the vertical direction of the drawing in FIG. 1) The width (length in the horizontal direction in the drawing in FIG. 1) was set to less than 15 mm, and the depth (length in the direction perpendicular to the paper surface in FIG. 1) was set to less than 40 mm. In addition, the torsion coil springs of the example and the conventional example are made of the same stainless steel (made of SUS304-WPB), the longitudinal elastic modulus E of each torsion coil spring is 192080 N / mm ² (19600 kgf / mm ^2), and the stress of each torsion coil spring The coefficient K is 1.12, the twist angle α when closed is 150 degrees, and the twist angle β when opened is 230 degrees, and the shutter is closed to satisfy the sealing performance (sealability requirement) required for the shutter when closed. The specifications of the torsion coil springs of the example and the conventional example were determined so that the hourly torque M1 was 900 N · mm (91.8 kgf · mm) or more.

従来例の捻りコイルバネのコイル径Ｄは13.8mm、線径ｄは2.0mm、有効巻き数ｎは10とした。コイル径Ｄは上記ガイド部の空間にほぼ等しい大きさとしたが、コイル長（線径ｄ×有効巻き数ｎに比例）は短くしている。これは要求される閉鎖時トルクＭ1を満足するためである。この従来例の捻りコイルバネのバネ定数ｋは347.9Ｎ・mm/rad（35.5kgf・mm/rad）、閉鎖時トルクＭ1は910.4Ｎ・mm（92.9kgf・mm）、開放時トルクＭ2は1395.5Ｎ・mm（142.4kgf・mm）となり、閉鎖時曲げ応力σ1は1298.5Ｎ/mm²（132.5kgf/mm²）、そして開放時曲げ応力σ2は1990.4Ｎ/mm²（203.1kgf/mm²）となる。 The coil diameter D of the torsion coil spring of the conventional example is 13.8 mm, the wire diameter d is 2.0 mm, and the effective number of turns n is 10. The coil diameter D is approximately equal to the space of the guide part, but the coil length (wire diameter d × proportional number of effective turns n) is shortened. This is to satisfy the required closing torque M1. The spring constant k of this conventional torsion coil spring is 347.9 N · mm / rad (35.5 kgf · mm / rad), the closing torque M1 is 910.4 N · mm (92.9 kgf · mm), and the opening torque M2 is 1395.5 N · mm (142.4 kgf · mm), the bending stress σ1 at closing is 1298.5 N / mm ² (132.5 kgf / mm ² ), and the bending stress σ2 at opening is 1990.4 N / mm ² (203.1 kgf / mm ² ).

実施例の内捻りコイルバネは、コイル径Ｄ＝10.0mm、線径ｄ＝1.4mm、有効巻き数ｎ＝20とした。この内捻りコイルバネのバネ定数ｋは57.62Ｎ・mm/rad（5.88kgf・mm/rad）、閉鎖時トルクＭ1は150.9Ｎ・mm（15.4kgf・mm）、開放時トルクＭ2は231.3Ｎ・mm（23.6kgf・mm）となり、閉鎖時曲げ応力σ1は627.2Ｎ/mm²（64.0kgf/mm²）、そして開放時曲げ応力σ2は961.4Ｎ/mm²（98.1kgf/mm²）となる。また、実施例の外捻りコイルバネは、コイル径Ｄ＝13.8mm、線径ｄ＝2.0mm、有効巻き数ｎ＝12とした。この内捻りコイルバネのバネ定数ｋは290.1Ｎ・mm/rad（29.6kgf・mm/rad）、閉鎖時トルクＭ1は759.5Ｎ・mm（77.5kgf・mm）、開放時トルクＭ2は1164.2Ｎ・mm（118.8kgf・mm）となり、閉鎖時曲げ応力σ1は1082.9Ｎ/mm²（110.5kgf/mm²）、そして開放時曲げ応力σ2は1660.1Ｎ/mm²（169.4kgf/mm²）となる。 The internal torsion coil spring of the example has a coil diameter D = 10.0 mm, a wire diameter d = 1.4 mm, and an effective winding number n = 20. The spring constant k of this torsion coil spring is 57.62 N · mm / rad (5.88 kgf · mm / rad), the closing torque M1 is 150.9 N · mm (15.4 kgf · mm), and the opening torque M2 is 231.3 N · mm ( 23.6 kgf · mm), the bending stress σ1 at closing is 627.2 N / mm ² (64.0 kgf / mm ² ), and the bending stress σ2 at opening is 961.4 N / mm ² (98.1 kgf / mm ² ). In addition, the external torsion coil spring of the example has a coil diameter D = 13.8 mm, a wire diameter d = 2.0 mm, and an effective number of turns n = 12. The spring constant k of this torsion coil spring is 290.1 N · mm / rad (29.6 kgf · mm / rad), the closing torque M1 is 759.5 N · mm (77.5 kgf · mm), and the opening torque M2 is 1164.2 N · mm ( 118.8kgf · mm), the bending bending stress σ1 is 1082.9N / mm ² (110.5kgf / mm ² ), and the opening bending stress σ2 is 1660.1N / mm ² (169.4kgf / mm ² ).

ここで、ステンレス製（SUS304-WPB製）の捻りコイルバネは、許容曲げ応力σpが1666Ｎ/mm²（170kgf/mm²）であり、通常、許容曲げ応力σpの70％、すなわち1166Ｎ/mm²（119kgf/mm²）が推奨曲げ応力σrとされている。これから、従来例の捻りコイルバネや実施例の内捻りコイルバネ及び外捻りコイルバネは、それぞれの閉鎖時曲げ応力σ1が許容曲げ応力σp以下、好ましくは推奨曲げ応力σrに収まること、すなわち曲げ応力要求を満足することが望まれる。そこで、上記シール性要求及び前記曲げ応力要求について、従来例及び実施例を比較した。比較結果を表１及び表２に示す。 Here, the torsion coil spring made of stainless steel (made of SUS304-WPB) has an allowable bending stress σp of 1666 N / mm ² (170 kgf / mm ² ), and is usually 70% of the allowable bending stress σp, that is, 1166 N / mm ² ( 119kgf / mm ² ) is the recommended bending stress σr. From the above, in the conventional torsion coil spring and the inner torsion coil spring and the outer torsion coil spring in the example, the bending stress σ1 at the time of closing is within the allowable bending stress σp, preferably within the recommended bending stress σr, that is, the bending stress requirement is satisfied. It is desirable to do. Therefore, the conventional example and the example were compared with respect to the sealing property requirement and the bending stress requirement. The comparison results are shown in Tables 1 and 2.

従来例は、閉鎖時トルクＭ1が910.4Ｎ・mm（92.9kgf・mm）であるから、表１に見られるように、シール性要求は満足される。しかし、閉鎖時曲げ応力σ1は1298.5Ｎ/mm²（132.5kgf/mm²）であるから、表２に見られるように、推奨曲げ応力σrを超えてしまい、かろうじて許容曲げ応力σpに収まるに過ぎない。このため、閉鎖時曲げ応力σ1より大きな開放時曲げ応力σ2は許容曲げ応力σpをも超えてしまう。このように、従来例が、開放時曲げ応力σ2が許容曲げ応力σpを超える状態で捻りコイルバネを使用している理由は、既述したように、シャッタの開閉頻度が少ないことから、開放時曲げ応力σ2が一時的に許容曲げ応力σpを超えても、捻りコイルバネが破損する虞は少ないと考えているからである。 In the conventional example, since the closing torque M1 is 910.4 N · mm (92.9 kgf · mm), as shown in Table 1, the sealability requirement is satisfied. However, since the closing bending stress σ1 is 1298.5 N / mm ² (132.5 kgf / mm ² ), as shown in Table 2, it exceeds the recommended bending stress σr and barely falls within the allowable bending stress σp. Absent. For this reason, the opening bending stress σ2 larger than the closing bending stress σ1 exceeds the allowable bending stress σp. In this way, the reason why the conventional example uses the torsion coil spring in a state in which the opening bending stress σ2 exceeds the allowable bending stress σp is that the shutter opening and closing frequency is low as described above, so This is because even if the stress σ2 temporarily exceeds the allowable bending stress σp, it is considered that the torsion coil spring is unlikely to be damaged.

実施例のシール性要求は、表１に見られるように、内捻りコイルバネ及び外捻りコイルバネの各閉鎖時トルクＭ1の合算値が910.4Ｎ・mm（92.9kgf・mm）となるため、従来例同様、満足される。そして、閉鎖時曲げ応力σ1及び開放時曲げ応力σ2はいずれも内捻りコイルバネ及び外捻りコイルバネ個々に判断されるところ、表２に見られるように、内捻りコイルバネ及び外捻りコイルバネの閉鎖時曲げ応力σ1、内捻りコイルバネの開放時曲げ応力σ2はいずれも推奨曲げ応力σr内に収まり、外捻りコイルバネの開放時曲げ応力σ2が推奨曲げ応力σrを超えながら許容曲げ応力σp内に収まっている。 As shown in Table 1, the sealing performance requirement of the embodiment is 910.4 N · mm (92.9 kgf · mm) as the total value of the closing torque M1 of the inner torsion coil spring and the outer torsion coil spring. Satisfied. The closed bending stress σ1 and the opening bending stress σ2 are determined individually for the inner torsion coil spring and the outer torsion coil spring. The opening bending stress σ2 of σ1 and the inner torsion coil spring are both within the recommended bending stress σr, and the opening bending stress σ2 of the outer torsion coil spring is within the allowable bending stress σp while exceeding the recommended bending stress σr.

シャッタ閉鎖型給油口におけるシャッタの開閉頻度は比較的少ないため、従来例の捻りコイルバネの開放時曲げ応力σ2が許容曲げ応力σpを一時的に超えても、前記捻りコイルバネが必ず破損するとは言えない。しかし、実施例に見られるように、内捻りコイルバネ及び外捻りコイルバネが共に許容曲げ応力内で使用できることから、およそ内捻りコイルバネ及び外捻りコイルバネが破損する虞はなくなり、永続的に安定したシャッタの開閉が保証される。しかも、閉鎖時トルクは内捻りコイルバネ及び外捻りコイルバネの合算値となることから、シール性要求を満足しやすい。このように、本発明はシャッタ閉鎖型給油口は、シャッタの開閉を担う捻りコイルバネが破損する可能性をなくし、安定なシャッタの開閉と前記シャッタによる確実なシール性とを実現している。 Since the shutter opening / closing frequency of the shutter-closed oil filler is relatively low, it cannot be said that the torsion coil spring is necessarily damaged even if the bending stress σ2 when the torsion coil spring of the conventional example temporarily exceeds the allowable bending stress σp. . However, as can be seen in the embodiment, since both the internal torsion coil spring and the external torsion coil spring can be used within the allowable bending stress, there is no possibility that the internal torsion coil spring and the external torsion coil spring will be damaged. Opening and closing is guaranteed. In addition, since the torque at the time of closing is a total value of the internal torsion coil spring and the external torsion coil spring, it is easy to satisfy the sealing requirement. As described above, according to the present invention, the shutter-closed oil filler opening eliminates the possibility that the torsion coil spring responsible for opening and closing the shutter is damaged, and realizes stable opening and closing of the shutter and reliable sealing performance by the shutter.

本発明を適用した本例のシャッタ閉蓋形給油口を正面方向から見た断面図である。It is sectional drawing which looked at the shutter cover type | mold fueling opening of this example to which this invention is applied from the front direction. 本例のシャッタ閉蓋形給油口を背面方向から見た断面図である。It is sectional drawing which looked at the shutter cover-type oil filler opening of this example from the back direction. 本例のシャッタ閉蓋形給油口の分解斜視図である。It is a disassembled perspective view of the shutter cover-type oil filler opening of this example. シャッタを組み付けた下ガイドブロックの正面図である。It is a front view of the lower guide block which assembled | attached the shutter. シャッタを組み付けた下ガイドブロックを正面方向から見た断面図である。It is sectional drawing which looked at the lower guide block which assembled | attached the shutter from the front direction. シャッタを組み付けた下ガイドブロックの平面図である。It is a top view of the lower guide block which assembled | attached the shutter. 無負荷時の内捻りコイルバネを背面方向から見た斜視図である。It is the perspective view which looked at the internal twist coil spring at the time of no load from the back direction. 無負荷時の外捻りコイルバネを背面方向から見た斜視図である。It is the perspective view which looked at the external torsion coil spring at the time of no load from the back direction. シャッタの閉鎖時を表すガイド部を正面方向から見た断面図である。It is sectional drawing which looked at the guide part showing the time of shutter closing from the front direction. シャッタの閉鎖時を表すガイド部の平面図である。It is a top view of the guide part showing the time of shutter closing. シャッタの閉鎖時の内捻りコイルバネを背面方向から見た斜視図である。It is the perspective view which looked at the internal twist coil spring at the time of closing of a shutter from the back direction. シャッタの閉鎖時の外捻りコイルバネを背面方向から見た斜視図である。It is the perspective view which looked at the external twist coil spring at the time of closing of a shutter from the back direction. シャッタの開放時を表すガイド部を正面方向から見た断面図である。It is sectional drawing which looked at the guide part showing the time of opening of a shutter from the front direction. シャッタの開放時を表すガイド部の平面図である。It is a top view of the guide part showing the time of opening of a shutter. シャッタの開放時の内捻りコイルバネを背面方向から見た斜視図である。It is the perspective view which looked at the internal twist coil spring at the time of opening of a shutter from the back direction. シャッタの開放時の外捻りコイルバネを背面方向から見た斜視図である。It is the perspective view which looked at the external twist coil spring at the time of opening of a shutter from the back direction. 別例のシャッタ閉蓋形給油口を背面方向から見た断面図である。It is sectional drawing which looked at the shutter closed lid type oil filler of another example from the back direction. 別例におけるシャッタを組み付けた下ガイドブロックの平面図である。It is a top view of the lower guide block which assembled | attached the shutter in another example.

符号の説明Explanation of symbols

１給油口ケース本体
２給油口ケース蓋
３ガイド部
31 下ガイドブロック
311 連通口
312 軸支持柱
32 上ガイドブロック
321 ガイド部開口
33 シールパッキン
４シャッタ
41 回動腕
411 差込み孔
42 シャッタ本体
43 シールリング
５内捻りコイルバネ
51 内固定腕
52 内作用腕
６外捻りコイルバネ
61 外固定腕
62 外作用腕
７回動軸 1 Oil filler case body 2 Oil filler case cover 3 Guide part
31 Lower guide block
311 Communication port
312 Shaft support column
32 Upper guide block
321 Guide opening
33 Seal packing 4 Shutter
41 Rotating arm
411 insertion hole
42 Shutter body
43 Seal ring 5 Internal twist coil spring
51 Inner fixed arm
52 Internal working arm 6 External torsion coil spring
61 Outer fixed arm
62 External working arm 7 Rotating shaft

Claims

燃料タンクに接続した給油管本体に設けられる給油口であって、給油口開口から挿入された給油ノズルを案内するガイド部開口を有し、捻りコイルバネにより前記ガイド部開口に下方から回動して押し付けられるシャッタを設け、前記シャッタが給油口開口から挿入された給油ノズルに押されて下向きに回動してガイド部開口を開き、前記給油ノズルを引き抜くと捻りコイルバネにより上向きに回動してガイド部開口を閉じる燃料給油管の給油口において、ガイド部に設けた支持軸にコイル径の小さな内捻りコイルバネを嵌め、前記内捻りコイルバネにコイル径の大きな外捻りコイルバネを嵌めて、内捻りコイルバネ及び外捻りコイルバネを嵌め合いの関係で前記支持軸に装着してなり、前記内捻りコイルバネ及び外捻りコイルバネが協働して、シャッタを下方から回動してガイド部開口に押し付けることを特徴とする燃料給油管の給油口。 A fuel supply port provided in a fuel supply pipe body connected to a fuel tank, having a guide part opening for guiding a fuel supply nozzle inserted from the fuel supply opening, and rotated to the guide part opening from below by a torsion coil spring A shutter to be pressed is provided, and the shutter is pushed downward by an oil supply nozzle inserted from an oil supply opening to rotate downward to open a guide opening, and when the oil supply nozzle is pulled out, the guide is rotated upward by a torsion coil spring. An internal torsion coil spring having a small coil diameter is fitted to a support shaft provided in the guide portion, and an external torsion coil spring having a large coil diameter is fitted to the internal torsion coil spring. An external torsion coil spring is mounted on the support shaft in a fitting relationship, and the inner torsion coil spring and the outer torsion coil spring cooperate with each other. Oil supply port of the fuel filler tube, characterized in that for pressing the guide opening by rotating the shutter from below.

ガイドに設けた支持軸はシャッタの回動軸である請求項１記載の燃料給油管の給油口。 The fuel supply port of a fuel supply pipe according to claim 1, wherein the support shaft provided in the guide is a rotation shaft of the shutter.

外捻りコイルバネは線材の巻き方向に延在する外固定腕及び外作用腕を有し、ガイド部の内面に外固定腕を押し当て、シャッタ下面に外作用腕を押し当て、内捻りコイルバネは前記外捻りコイルバネの内側でシャッタの回動軸の延在方向に突出する内固定腕及び内作用腕を有し、ガイド部の内面に内固定腕を突き刺し、シャッタの回動軸に支持されるシャッタの回動腕に内作用腕を突き刺した請求項２記載の燃料給油管の給油口。 The external torsion coil spring has an outer fixed arm and an outer acting arm that extend in the winding direction of the wire. The outer torsion arm is pressed against the inner surface of the guide portion, the outer acting arm is pressed against the lower surface of the shutter. A shutter having an inner fixed arm and an inner working arm protruding in the extending direction of the rotating shaft of the shutter inside the outer torsion coil spring, and the inner fixed arm is inserted into the inner surface of the guide portion and supported by the rotating shaft of the shutter The fuel filler opening of the fuel filler pipe according to claim 2, wherein an inner working arm is pierced into the rotating arm.

外捻りコイルバネは線材の巻き方向に延在する外固定腕及び外作用腕を有し、ガイド部の内面に外固定腕を押し当て、シャッタ下面に外作用腕を押し当て、内捻りコイルバネは前記外捻りコイルバネの内側でシャッタの回動軸の延在方向に突出する内固定腕と前記外捻りコイルバネの内側でシャッタの回動軸の延在方向に突出した位置から線材の巻き方向に曲げた内作用腕とを有し、ガイド部の内面に内固定腕を突き刺し、シャッタ下面に内作用腕を押し当てた請求項２記載の燃料給油管の給油口。 The external torsion coil spring has an outer fixed arm and an outer acting arm that extend in the winding direction of the wire. The outer torsion arm is pressed against the inner surface of the guide portion, the outer acting arm is pressed against the lower surface of the shutter. Bending in the winding direction of the wire from the inner fixed arm that protrudes in the extending direction of the rotating shaft of the shutter inside the externally twisted coil spring and the position that protrudes in the extending direction of the rotating shaft of the shutter inside the externally twisted coil spring The fuel filler opening of the fuel supply pipe according to claim 2, further comprising an inner working arm, wherein the inner fixed arm is pierced into the inner surface of the guide portion, and the inner working arm is pressed against the lower surface of the shutter.