JPH0821317A - Release restraining device for evaporated fuel - Google Patents
Release restraining device for evaporated fuelInfo
- Publication number
- JPH0821317A JPH0821317A JP6157105A JP15710594A JPH0821317A JP H0821317 A JPH0821317 A JP H0821317A JP 6157105 A JP6157105 A JP 6157105A JP 15710594 A JP15710594 A JP 15710594A JP H0821317 A JPH0821317 A JP H0821317A
- Authority
- JP
- Japan
- Prior art keywords
- evaporated fuel
- fuel passage
- fuel
- tank body
- passage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、上方に延出する給油管
がタンク本体に設けられて成る燃料タンクからの給油時
の蒸発燃料放出を抑制する蒸発燃料放出抑制装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an evaporative fuel release suppressing device for suppressing evaporative fuel release at the time of refueling from a fuel tank in which an oil refueling pipe extending upward is provided in a tank body.
【０００２】[0002]
【従来の技術】従来、燃料タンクへの給油を円滑に行な
うために燃料タンクにおけるタンク本体の上部が給油管
の入口部に接続されたものが、特開昭５８−１４１９２
３号公報で開示されているが、タンク本体内で発生した
蒸発燃料が給油時に大気に放出されて大気汚染の原因と
なる。そこで、蒸発燃料の大気放出を抑制する装置とし
て、たとえば特開昭６１−５３４５１号公報で開示され
たものが知られており、このものでは、給油管からの蒸
発燃料の外部への放出を、給油管内に設けられているシ
ールを給油ガンのノズル外周に密接させることにより阻
止するようにしている。しかるに、シールの耐久性が問
題であり、給油の繰り返しにより前記シールが劣化ある
いは破損すると、蒸発燃料の給油管からの外部への放出
が避けられない。2. Description of the Related Art Conventionally, Japanese Patent Laid-Open No. 58-14192 discloses a fuel tank in which an upper portion of a tank body is connected to an inlet portion of a fuel supply pipe in order to smoothly supply fuel to the fuel tank.
As disclosed in Japanese Patent No. 3, the evaporative fuel generated in the tank body is released to the atmosphere during refueling, which causes air pollution. Therefore, as a device for suppressing atmospheric release of evaporated fuel, for example, one disclosed in Japanese Patent Laid-Open No. 61-53451 is known. In this device, the release of evaporated fuel from the fuel supply pipe to the outside is known. The seal provided in the oil supply pipe is brought into close contact with the outer circumference of the nozzle of the oil supply gun so as to prevent the seal. However, the durability of the seal is a problem, and if the seal deteriorates or breaks due to repeated refueling, it is inevitable to release the evaporated fuel to the outside from the refueling pipe.
【０００３】本発明は、かかる事情に鑑みてなされたも
のであり、耐久性が問題となるシールを用いることな
く、給油時の蒸発燃料の放出を効果的に抑制し得るよう
にした蒸発燃料放出抑制装置を提供することを目的とす
る。The present invention has been made in view of the above circumstances, and it is possible to effectively suppress the release of the evaporated fuel during refueling without using a seal which has a problem of durability. An object is to provide a suppression device.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するため
に、請求項１記載の発明は、タンク本体からの蒸発燃料
を吸着するキャニスタと、タンク本体およびキャニスタ
間を結ぶ第１蒸発燃料通路と、給油管の入口部およびタ
ンク本体間を結ぶ第２蒸発燃料通路とを備え、第２蒸発
燃料通路の通気抵抗が第１蒸発燃料通路の通気抵抗より
も大きく設定されることを特徴とする。In order to achieve the above object, the invention according to claim 1 includes a canister for adsorbing evaporated fuel from a tank body, and a first evaporated fuel passage connecting the tank body and the canister. A second evaporated fuel passage connecting the inlet portion of the oil supply pipe and the tank body, and the ventilation resistance of the second evaporated fuel passage is set to be larger than the ventilation resistance of the first evaporated fuel passage.
【０００５】また請求項２記載の発明によれば、上記請
求項１記載の発明の構成に加えて、第１蒸発燃料通路の
タンク本体への接続部には、タンク本体内の燃料液面が
最高レベルとなるのに応じて閉弁して第１蒸発燃料通路
を閉鎖する弁が設けられ、第２蒸発燃料通路は、前記弁
よりも下流側で第１蒸発燃料通路から分岐される。According to a second aspect of the invention, in addition to the configuration of the first aspect of the invention, the fuel liquid level in the tank body is provided at the connecting portion of the first evaporated fuel passage to the tank body. A valve is provided to close the first evaporated fuel passage by closing the valve according to the highest level, and the second evaporated fuel passage is branched from the first evaporated fuel passage downstream of the valve.
【０００６】さらに請求項３記載の発明によれば、上記
請求項１記載の発明の構成に加えて、給油管の入口部に
は、給油ガンの給油管への挿入に応じて開くシャッタが
設けられ、第２蒸発燃料通路は、前記シャッタよりもタ
ンク本体側で給油管に接続される。According to the third aspect of the invention, in addition to the structure of the first aspect of the invention, a shutter is provided at the inlet of the oil supply pipe, the shutter being opened in response to the insertion of the oil supply gun into the oil supply pipe. The second fuel vapor passage is connected to the fuel supply pipe on the tank body side with respect to the shutter.
【０００７】[0007]
【実施例】以下、図面により本発明の一実施例について
説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
【０００８】図１ないし図４は本発明の一実施例を示す
ものであり、図１は蒸発燃料放出抑制装置の構成を示す
切欠き断面図、図２は給油管の入口部の拡大断面図、図
３は通気抵抗比と蒸発燃料放出量との関係を示す図、図
４は通気抵抗比と燃料タンク内の蒸発燃料発生量との関
係を示す図である。1 to 4 show an embodiment of the present invention. FIG. 1 is a cutaway sectional view showing a structure of a fuel vapor emission restraining device, and FIG. 2 is an enlarged sectional view of an inlet portion of an oil supply pipe. FIG. 3 is a diagram showing the relationship between the ventilation resistance ratio and the evaporated fuel discharge amount, and FIG. 4 is a diagram showing the relationship between the ventilation resistance ratio and the evaporated fuel generation amount in the fuel tank.
【０００９】先ず図１において、燃料タンクＴは、タン
ク本体１と、該タンク本体１から斜め上向きに延設され
る給油管２とを備え、給油管２の上端には拡径した入口
部２ａが設けられる。またタンク本体１の上部には、第
１蒸発燃料通路３の一端部が接続されており、燃料タン
クＴからの蒸発燃料を吸着するキャニスタＣが第１蒸発
燃料通路３の他端に接続される。しかも第１蒸発燃料通
路３のタンク本体１内への接続部には、フロート室４と
フロート５とで構成されるフロート弁６が設けられ、該
フロート弁６は、燃料タンクＴにおけるタンク本体１内
の燃料液面が鎖線で示す最高レベルまで達したときに閉
弁するものであり、燃料タンクＴへの給油時には開弁状
態となっている。First, in FIG. 1, a fuel tank T is provided with a tank body 1 and an oil supply pipe 2 extending obliquely upward from the tank body 1. An upper end of the oil supply pipe 2 has an enlarged inlet portion 2a. Is provided. One end of the first evaporated fuel passage 3 is connected to the upper portion of the tank body 1, and the canister C that adsorbs the evaporated fuel from the fuel tank T is connected to the other end of the first evaporated fuel passage 3. . Moreover, a float valve 6 composed of a float chamber 4 and a float 5 is provided at a connection portion of the first evaporated fuel passage 3 to the inside of the tank body 1, and the float valve 6 is provided in the tank body 1 of the fuel tank T. The valve closes when the liquid level inside the fuel reaches the maximum level shown by the chain line, and is open when refueling the fuel tank T.
【００１０】第１蒸発燃料通路３の途中には、給油時に
開弁する開閉弁Ｖが介設される。この開閉弁Ｖのハウジ
ング８には、ダイヤフラム９の周縁部が挟持されてお
り、該ダイヤフラム９によりハウジング８内は、第１蒸
発燃料通路３の燃料タンクＴ側の部分３ａに通じる弁室
１０と、ばね室１１とに区画され、ばね室１１内にはダ
イヤフラム９を弁室１０側に付勢するばね１２が収納さ
れる。また弁室１０内には、第１蒸発燃料通路２３のキ
ャニスタＣ側の部分２３ｂに通じる弁孔１３を開閉可能
であってダイヤフラム９に連結される弁体１４が収納さ
れる。しかもばね室１１は、連通路１５を介して給油管
２の入口部２ａに連通される。An opening / closing valve V that opens at the time of refueling is provided in the middle of the first evaporated fuel passage 3. The housing 8 of the on-off valve V has a peripheral edge portion of a diaphragm 9 sandwiched therebetween, and the inside of the housing 8 is surrounded by the diaphragm 9 and a valve chamber 10 communicating with a portion 3a of the first evaporated fuel passage 3 on the fuel tank T side. A spring 12 for urging the diaphragm 9 toward the valve chamber 10 is housed in the spring chamber 11. Further, in the valve chamber 10, a valve body 14 that can open and close a valve hole 13 that communicates with a portion 23b of the first evaporated fuel passage 23 on the canister C side and is connected to the diaphragm 9 is housed. Moreover, the spring chamber 11 communicates with the inlet portion 2a of the oil supply pipe 2 through the communication passage 15.
【００１１】このような開閉弁Ｖでは、給油管２の入口
部２ａを閉じた状態では弁体１４が弁孔１３を開く側に
ダイヤフラム９を変位させる差圧が弁室１０およびばね
室１１間に生じることはなく、閉弁状態が保持される
が、入口部２ａを開いて給油ガンＧにより燃料タンクＴ
内に燃料を給油する際には、燃料タンクＴ内の圧力すな
わち弁室１０の圧力増大に応じてダイヤフラム９がばね
室１１の容積を縮小する側に変位し、それに応じて弁体
１４が弁孔１３を開くので、給油時には開弁状態とな
る。In such an on-off valve V, when the inlet portion 2a of the oil supply pipe 2 is closed, the differential pressure that displaces the diaphragm 9 toward the side where the valve body 14 opens the valve hole 13 creates a differential pressure between the valve chamber 10 and the spring chamber 11. The valve closed state is maintained, but the inlet 2a is opened and the fuel tank G is opened by the fuel gun G.
When fuel is supplied to the inside, the diaphragm 9 is displaced to the side that reduces the volume of the spring chamber 11 in accordance with the pressure in the fuel tank T, that is, the increase in the pressure in the valve chamber 10, and accordingly the valve body 14 opens the valve. Since the hole 13 is opened, the valve is opened when refueling.
【００１２】図２を併せて参照して、燃料タンクＴへの
給油時に、給油管２の入口部２ａには給油ガンＧのノズ
ル１６が挿入されるものであり、このノズル１６の挿入
に応じて開くシャッタ１７が入口部２ａに設けられる。
すなわち入口部２ａの中間部内面には、該入口部２ａ内
を内外に区画する隔壁１８が設けられており、この隔壁
１８には、給油ガンＧのノズル１６を挿入し得る挿入孔
１９が設けられる。而してシャッタ１７は、隔壁１８の
内面側にピン２０により回動自在に支承されるものであ
り、隔壁１８およびシャッタ１７間に設けられるねじり
ばね２１によりシャッタ１７は挿入孔１９を内方側から
閉鎖する方向に付勢される。したがって図２で示すよう
にノズル１６が挿入孔１９に挿入されたときには、ねじ
りばね２１の付勢力に抗してシャッタ１７が強制的に開
かれ、挿入孔１９からノズル１６が引き抜かれたときに
は、ねじりばね２１によりシャッタ１７は挿入孔１９を
閉じる位置まで回動する。Referring also to FIG. 2, the nozzle 16 of the fuel gun G is inserted into the inlet portion 2a of the fuel filler pipe 2 when fueling the fuel tank T, and depending on the insertion of the nozzle 16. A shutter 17 that opens is provided at the entrance 2a.
That is, a partition wall 18 for partitioning the inside of the inlet portion 2a into the inside and the outside is provided on the inner surface of the intermediate portion of the inlet portion 2a, and the partition wall 18 is provided with an insertion hole 19 into which the nozzle 16 of the fuel gun G can be inserted. To be Thus, the shutter 17 is rotatably supported by the pin 20 on the inner surface side of the partition wall 18, and the torsion spring 21 provided between the partition wall 18 and the shutter 17 allows the shutter 17 to insert the insertion hole 19 inward. It is urged in the direction to close from. Therefore, as shown in FIG. 2, when the nozzle 16 is inserted into the insertion hole 19, the shutter 17 is forcibly opened against the biasing force of the torsion spring 21, and when the nozzle 16 is pulled out from the insertion hole 19, The shutter 17 is rotated by the torsion spring 21 to a position where the insertion hole 19 is closed.
【００１３】開閉弁Ｖのばね室１１に通じる連通路１５
は、前記シャッタ１７よりも外方側で給油管２の入口部
２ａに接続される。A communication passage 15 communicating with the spring chamber 11 of the opening / closing valve V.
Is connected to the inlet portion 2 a of the oil supply pipe 2 on the outer side of the shutter 17.
【００１４】再び図１において、第１蒸発燃料通路３の
フロート弁６および開閉弁Ｖ間からは第２蒸発燃料通路
２２が分岐されており、この第２蒸発燃料通路２２は、
前記シャッタ１７よりもタンク本体１側で給油管２の入
口部２ａに接続される。しかも図２で示すように、第２
蒸発燃料通路２２の入口部２ａ内への開口端２２ａ
1は、給油ガンＧのノズル１６からの燃料の流れ方向に
向けて、たとえば斜め下方に向くように形成される。Referring again to FIG. 1, the second evaporated fuel passage 22 is branched from the float valve 6 and the on-off valve V of the first evaporated fuel passage 3, and the second evaporated fuel passage 22 is
The tank body 1 side of the shutter 17 is connected to the inlet portion 2 a of the oil supply pipe 2. Moreover, as shown in FIG.
Opening end 22a of the fuel vapor passage 22 into the inlet portion 2a
1 is formed so as to face obliquely downward, for example, in the direction of fuel flow from the nozzle 16 of the fuel gun G.
【００１５】この第２蒸発燃料通路２２の途中には、タ
ンク本体１側の蒸発燃料圧が所定の開弁圧以上となった
ときに開弁してタンク本体１側から給油管２の入口部２
ａ側への蒸発燃料の流通を許容するチェック弁２５が設
けられ、該チェック弁２５の開弁圧は開閉弁Ｖの開弁圧
よりもわずかに高く設定される。このチェック弁２５
は、燃料タンクＴへの給油速度が遅いことに起因して開
閉弁Ｖが開弁しない状態で第２蒸発燃料通路２２を経て
蒸発燃料が大気に放出されるのを防止するものである
が、給油速度が遅いときには蒸発燃料を給油管２の入口
部２ａ側に戻さなくても、蒸発燃料の発生量自体が少な
いので問題とはならない。In the middle of the second evaporated fuel passage 22, the valve is opened when the evaporated fuel pressure on the tank body 1 side becomes equal to or higher than a predetermined valve opening pressure, and the inlet portion of the oil supply pipe 2 is opened from the tank body 1 side. Two
A check valve 25 that allows the flow of the evaporated fuel to the a side is provided, and the valve opening pressure of the check valve 25 is set to be slightly higher than the valve opening pressure of the on-off valve V. This check valve 25
Is to prevent the vaporized fuel from being released to the atmosphere through the second vaporized fuel passage 22 in a state where the opening / closing valve V is not opened due to the slow fueling speed to the fuel tank T. When the refueling speed is slow, there is no problem even if the evaporated fuel is not returned to the inlet portion 2a side of the oil supply pipe 2 because the amount of evaporated fuel generated is small.
【００１６】第２蒸発燃料通路２２の通気抵抗Ｒ2 は、
たとえば通路径を小径とすること等により、第１蒸発燃
料通路３の通気抵抗Ｒ3 よりも大きく設定される。而し
て第２蒸発燃料通路２２の通気抵抗Ｒ2 が大きくなる
と、給油ガンＧによる給油時にタンク本体１内で発生し
た蒸発燃料のうち第２蒸発燃料通路２２側に流れる蒸発
燃料量が抑制されるものであり、図３で示すように、第
１蒸発燃料通路３の通気抵抗Ｒ1 に対する第２蒸発燃料
通路２２の通気抵抗Ｒ2 の比が大きくなるにつれて、給
油管２から外部への蒸発燃料放出量は低下する。ここで
蒸発燃料放出量が許容レベルＬ以下となるのは、通気抵
抗比（Ｒ2 ／Ｒ1 ）が２以上であり、第２蒸発燃料通路
２２の通気抵抗Ｒ2 は、第１蒸発燃料通路３の通気抵抗
Ｒ1 より２倍以上大きいことが望ましい。The ventilation resistance R 2 of the second evaporated fuel passage 22 is
For example, by making the passage diameter small, it is set to be larger than the ventilation resistance R 3 of the first evaporated fuel passage 3. When the ventilation resistance R 2 of the second evaporated fuel passage 22 is increased, the amount of evaporated fuel flowing to the second evaporated fuel passage 22 side out of the evaporated fuel generated in the tank body 1 at the time of refueling by the refueling gun G is suppressed. As shown in FIG. 3, as the ratio of the ventilation resistance R 2 of the second evaporated fuel passage 22 to the ventilation resistance R 1 of the first evaporated fuel passage 3 increases, the evaporation from the oil supply pipe 2 to the outside is increased. The amount of fuel released decreases. Here, the evaporative fuel release amount becomes equal to or lower than the allowable level L when the ventilation resistance ratio (R 2 / R 1 ) is 2 or more, and the ventilation resistance R 2 of the second evaporated fuel passage 22 is equal to the first evaporated fuel passage. It is desirable that the air flow resistance R 1 of 3 is twice or more.
【００１７】ところで、第２蒸発燃料通路２２から給油
管２の入口部２ａに導かれた蒸発燃料の多くは、給油ガ
ンＧのノズル１６からの燃料流に同伴してタンク本体１
内に還流せしめられるものであり、タンク本体１内で新
たに発生する蒸発燃料は、蒸発燃料の還流量が少なくな
るのに伴う新気の巻き込み量増大に応じて多くなる。す
なわち図４で示すように、第１蒸発燃料通路３の通気抵
抗Ｒ1 に対する第２蒸発燃料通路２２の通気抵抗Ｒ2 の
比が大きくなるにつれて、タンク本体１内で新たに発生
する蒸発燃料は多くなるものであり、第２蒸発燃料通路
２２から給油管２に導かれる蒸発燃料が抑制されると、
残余の多くの蒸発燃料が第１蒸発燃料通路３を経てキャ
ニスタＣに導かれることになり、キャニスタＣの容量を
大きくせねばならない。そこで、蒸発燃料の放出量を抑
制する観点からは、通気抵抗比（Ｒ2 ／Ｒ1 ）が２以上
の大きな値となることが望ましいのであるが、キャニス
タＣの容量を大きくしないことを考慮して、通気抵抗比
（Ｒ2 ／Ｒ1 ）が、２以上ではあるが２を大きくは超え
ない値となるように、第２蒸発燃料通路２２の通気抵抗
Ｒ2 が設定される。By the way, most of the evaporated fuel introduced from the second evaporated fuel passage 22 to the inlet portion 2a of the fuel supply pipe 2 is accompanied by the fuel flow from the nozzle 16 of the fuel supply gun G and the tank body 1 is carried out.
The amount of evaporated fuel newly generated in the tank body 1 increases as the amount of fresh air entrained increases as the amount of evaporated fuel recirculated decreases. That is, as shown in FIG. 4, as the ratio of the ventilation resistance R 2 of the second evaporated fuel passage 22 to the ventilation resistance R 1 of the first evaporated fuel passage 3 increases, the evaporated fuel newly generated in the tank body 1 If the amount of evaporated fuel introduced from the second evaporated fuel passage 22 to the fuel supply pipe 2 is suppressed,
A large amount of the remaining evaporated fuel will be guided to the canister C through the first evaporated fuel passage 3, and the capacity of the canister C must be increased. Therefore, from the viewpoint of suppressing the amount of vaporized fuel released, it is desirable that the ventilation resistance ratio (R 2 / R 1 ) be a large value of 2 or more, but in consideration of not increasing the capacity of the canister C. Thus, the ventilation resistance R 2 of the second evaporated fuel passage 22 is set so that the ventilation resistance ratio (R 2 / R 1 ) is not less than 2 but does not greatly exceed 2 .
【００１８】次にこの実施例の作用について説明する
と、燃料タンクＴへの給油ガンＧによる通常の給油速度
による給油時には、フロート弁６および開閉弁Ｖは開弁
しており、燃料タンクＴ内で発生した蒸発燃料は、第１
蒸発燃料通路３を介してキャニスタＣに導かれるととも
に、第２蒸発燃料通路２２を介して給油管２の入口部２
ａに導かれる。而して第２蒸発燃料通路２２の給油管２
への開口端２２ａ1 は、ノズル１６からの燃料の流れ方
向に向けて斜め下方に向くように形成されており、第２
蒸発燃料通路２２からの蒸発燃料の多くはノズル１６か
らの燃料流に同伴してタンク本体１内へと還流する。し
かも第２蒸発燃料通路２２の通気抵抗Ｒ2は、第１蒸発
燃料通路３の通気抵抗Ｒ1 に比べて大きく設定されるも
のであり、第２蒸発燃料通路２２に導かれる蒸発燃料量
を制限して、給油管２から外部への蒸発燃料放出量を抑
制することができる。Next, the operation of this embodiment will be described. At the time of refueling the fuel tank T by the refueling gun G at a normal refueling speed, the float valve 6 and the opening / closing valve V are open, and the fuel tank T is refueled. The generated evaporated fuel is the first
It is guided to the canister C via the evaporated fuel passage 3 and also the inlet portion 2 of the oil supply pipe 2 via the second evaporated fuel passage 22.
led to a. Thus, the oil supply pipe 2 of the second evaporated fuel passage 22
The opening end 22a 1 is formed so as to face obliquely downward in the direction of fuel flow from the nozzle 16.
Most of the evaporated fuel from the evaporated fuel passage 22 is entrained in the fuel flow from the nozzle 16 and flows back into the tank body 1. Moreover, the ventilation resistance R 2 of the second evaporated fuel passage 22 is set larger than the ventilation resistance R 1 of the first evaporated fuel passage 3, and the amount of evaporated fuel guided to the second evaporated fuel passage 22 is limited. Thus, the amount of evaporated fuel released from the oil supply pipe 2 to the outside can be suppressed.
【００１９】また第２蒸発燃料通路２２は、シャッタ１
７よりもタンク本体１側で給油管２の入口部２ａに接続
されるものであるので、第２蒸発燃料通路２２からの蒸
発燃料をノズル１６からの燃料流に、より効果的に同伴
せしめることができ、これにより、蒸発燃料の外部への
放出をより効果的に抑制することができる。The second evaporated fuel passage 22 is provided with the shutter 1
Since it is connected to the inlet portion 2a of the fuel supply pipe 2 on the side of the tank body 1 with respect to 7, the evaporated fuel from the second evaporated fuel passage 22 can be more effectively entrained in the fuel flow from the nozzle 16. Therefore, it is possible to more effectively suppress the release of the evaporated fuel to the outside.
【００２０】さらに第２蒸発燃料通路２２は、タンク本
体１内の燃料液面が最高レベルとなるのに応じて閉弁し
て第１蒸発燃料通路３を閉鎖するフロート弁６よりも下
流側で第１蒸発燃料通路３から分岐されるものであるの
で、第２蒸発燃料通路２２が第１蒸発燃料通路３とは独
立してタンク本体１に接続された場合に比べると、タン
ク本体１内の燃料液面最高レベルをフロート弁６のみで
規定することができ、燃料液面最高レベルの設定精度を
容易に向上することができる。Further, the second evaporative fuel passage 22 is located downstream of the float valve 6 which closes the first evaporative fuel passage 3 by closing the second evaporative fuel passage 22 when the liquid level in the tank body 1 reaches the maximum level. Since the second evaporated fuel passage 22 is branched from the first evaporated fuel passage 3, as compared with the case where the second evaporated fuel passage 22 is connected to the tank body 1 independently of the first evaporated fuel passage 3, The maximum fuel liquid level can be defined only by the float valve 6, and the setting accuracy of the maximum fuel liquid level can be easily improved.
【００２１】ところで、図５で示す第１変形例のよう
に、第２蒸発燃料通路２２の入口部２ａ内への開口端２
２ａ2 が、斜めに切断されて斜め下方に向くように形成
されたものであっなもよく、図６で示す第２変形例のよ
うに、第２蒸発燃料通路２２の入口部２ａ内への開口端
２２ａ3 が略Ｕ状に屈曲されて下方を向くように形成さ
れたものであってもよく、さらに図７で示す第３変形例
のように、第２蒸発燃料通路２２の入口部２ａ内への開
口端２２ａ4 が入口部２ａにほぼ直角に接続されるもの
の、開口端２２ａの上方で入口部２ａの内面に邪魔板２
３が設けられるようにしてもよい。By the way, as in the first modification shown in FIG. 5, the opening end 2 into the inlet portion 2a of the second evaporated fuel passage 22 is formed.
2a 2 may not be formed so as to be cut obliquely and directed obliquely downward, and as in the second modification shown in FIG. 6, the inlet 2a of the second evaporated fuel passage 22 to the inside 2a 2 The opening end 22a 3 may be formed so as to be bent in a substantially U shape so as to face downward. Further, as in the third modification shown in FIG. 7, the inlet portion 2a of the second evaporated fuel passage 22 may be formed. Although the opening end 22a 4 into the inside is connected to the entrance portion 2a at a substantially right angle, the baffle plate 2 is provided above the opening end 22a and inside the entrance portion 2a.
3 may be provided.
【００２２】以上、本発明の実施例を詳述したが、本発
明は上記実施例に限定されるものではなく、特許請求の
範囲に記載された本発明を逸脱することなく種々の設計
変更を行なうことが可能である。Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the claims. It is possible to do.
【００２３】[0023]
【発明の効果】以上のように請求項１記載の発明によれ
ば、 上記目的を達成するために、請求項１記載の発明
は、給油管の入口部およびタンク本体間を結ぶ第２蒸発
燃料通路の通気抵抗が、タンク本体およびキャニスタ間
を結ぶ第１蒸発燃料通路の通気抵抗よりも大きく設定さ
れるので、従来用いていたシールを用いることなく、給
油時のタンク本体内への新気の巻き込みを抑えてキャニ
スタの容量増大を回避しつつ、第２蒸発燃料通路に導か
れる蒸発燃料量を抑えて、蒸発燃料の外部放出を抑制す
ることができる。As described above, according to the invention described in claim 1, in order to achieve the above object, the invention described in claim 1 is the second evaporated fuel connecting the inlet portion of the oil supply pipe and the tank body. Since the ventilation resistance of the passage is set to be larger than the ventilation resistance of the first evaporative fuel passage that connects the tank body and the canister, the fresh air inside the tank body at the time of refueling can be used without using the seal that has been used conventionally. It is possible to suppress the entrainment and avoid an increase in the capacity of the canister, while suppressing the amount of the evaporated fuel introduced to the second evaporated fuel passage and suppressing the external release of the evaporated fuel.
【００２４】また請求項２記載の発明によれば、上記請
求項１記載の発明の構成に加えて、第１蒸発燃料通路の
タンク本体への接続部には、タンク本体内の燃料液面が
最高レベルとなるのに応じて閉弁して第１蒸発燃料通路
を閉鎖する弁が設けられ、第２蒸発燃料通路は、前記弁
よりも下流側で第１蒸発燃料通路から分岐されるので、
タンク本体内の燃料液面レベルの設定精度を容易に向上
可能である。According to the second aspect of the invention, in addition to the structure of the first aspect of the invention, the fuel liquid level in the tank body is provided at the connecting portion of the first evaporated fuel passage to the tank body. A valve is provided for closing the first evaporated fuel passage according to the highest level, and the second evaporated fuel passage is branched from the first evaporated fuel passage on the downstream side of the valve.
It is possible to easily improve the setting accuracy of the fuel liquid level in the tank body.
【００２５】さらに請求項３記載の発明によれば、上記
請求項１記載の発明の構成に加えて、給油管の入口部に
は、給油ガンの給油管への挿入に応じて開くシャッタが
設けられ、第２蒸発燃料通路は、前記シャッタよりもタ
ンク本体側で給油管に接続されるので、第２蒸発燃料通
路からの蒸発燃料をより効果的に給油ガンからの燃料流
に同伴せしめ、これにより蒸発燃料の外部への放出をよ
り効果的に抑制することができる。According to the invention of claim 3, in addition to the structure of the invention of claim 1, a shutter is provided at the inlet of the oil supply pipe, the shutter being opened in response to the insertion of the oil supply gun into the oil supply pipe. The second evaporated fuel passage is connected to the fuel supply pipe on the tank body side with respect to the shutter, so that the evaporated fuel from the second evaporated fuel passage is more effectively entrained in the fuel flow from the fuel gun. As a result, it is possible to more effectively suppress the release of the evaporated fuel to the outside.
【図１】蒸発燃料放出抑制装置の構成を示す切欠き断面
図である。FIG. 1 is a cutaway sectional view showing a configuration of an evaporated fuel release suppressing device.
【図２】給油管の入口部の拡大断面図である。FIG. 2 is an enlarged cross-sectional view of an inlet portion of an oil supply pipe.
【図３】通気抵抗比と蒸発燃料放出量との関係を示す図
である。FIG. 3 is a diagram showing a relationship between a ventilation resistance ratio and an evaporated fuel release amount.
【図４】通気抵抗比と燃料タンク内の蒸発燃料発生量と
の関係を示す図である。FIG. 4 is a diagram showing a relationship between a ventilation resistance ratio and an amount of fuel vapor generated in a fuel tank.
【図５】第１変形例の図２に対応した断面図である。FIG. 5 is a sectional view corresponding to FIG. 2 of a first modified example.
【図６】第２変形例の図２に対応した断面図である。FIG. 6 is a sectional view corresponding to FIG. 2 of a second modification.
【図７】第３変形例の図２に対応した断面図である。FIG. 7 is a sectional view of a third modification example corresponding to FIG.
１ タンク本体 ２ 給油管 ２ａ 給油管の入口部 ３ 第１蒸発燃料通路 ６ フロート弁 １７ シャッタ ２２ 第２蒸発燃料通路 Ｃ キャニスタ Ｇ 給油ガン Ｔ 燃料タンク 1 Tank Main Body 2 Refueling Pipe 2a Refueling Pipe Inlet 3 First Evaporative Fuel Passage 6 Float Valve 17 Shutter 22 Second Evaporative Fuel Passage C Canister G Refueling Gun T Fuel Tank
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成６年７月１１日[Submission date] July 11, 1994
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１０[Correction target item name] 0010
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１０】第１蒸発燃料通路３の途中には、給油時に
開弁する開閉弁Ｖが介設される。この開閉弁Ｖのハウジ
ング８には、ダイヤフラム９の周縁部が挟持されてお
り、該ダイヤフラム９によりハウジング８内は、第１蒸
発燃料通路３の燃料タンクＴ側の部分３ａに通じる弁室
１０と、ばね室１１とに区画され、ばね室１１内にはダ
イヤフラム９を弁室１０側に付勢するばね１２が収納さ
れる。また弁室１０内には、第１蒸発燃料通路３のキャ
ニスタＣ側の部分３ｂに通じる弁孔１３を開閉可能であ
ってダイヤフラム９に連結される弁体１４が収納され
る。しかもばね室１１は、連通路１５を介して給油管２
の入口部２ａに連通される。An opening / closing valve V that opens at the time of refueling is provided in the middle of the first evaporated fuel passage 3. The housing 8 of the on-off valve V has a peripheral edge portion of a diaphragm 9 sandwiched therebetween, and the inside of the housing 8 is surrounded by the diaphragm 9 and a valve chamber 10 communicating with a portion 3a of the first evaporated fuel passage 3 on the fuel tank T side. A spring 12 for urging the diaphragm 9 toward the valve chamber 10 is housed in the spring chamber 11. The addition valve chamber 10, the valve element 14 connected to the valve hole 13 communicating with the part amount 3 b of the first canister C side of the evaporative fuel passage path 3 a can be opened and closed on the diaphragm 9 is accommodated. Moreover, the spring chamber 11 is connected to the oil supply pipe 2 via the communication passage 15.
Is communicated with the inlet portion 2a of the.
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１６[Correction target item name] 0016
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１６】第２蒸発燃料通路２２の通気抵抗Ｒ2 は、
たとえば通路径を小径とすること等により、第１蒸発燃
料通路３の通気抵抗Ｒ 1 よりも大きく設定される。而し
て第２蒸発燃料通路２２の通気抵抗Ｒ2 が大きくなる
と、給油ガンＧによる給油時にタンク本体１内で発生し
た蒸発燃料のうち第２蒸発燃料通路２２側に流れる蒸発
燃料量が抑制されるものであり、図３で示すように、第
１蒸発燃料通路３の通気抵抗Ｒ1 に対する第２蒸発燃料
通路２２の通気抵抗Ｒ2 の比が大きくなるにつれて、給
油管２から外部への蒸発燃料放出量は低下する。ここで
蒸発燃料放出量が許容レベルＬ以下となるのは、通気抵
抗比（Ｒ2 ／Ｒ1 ）が２以上であり、第２蒸発燃料通路
２２の通気抵抗Ｒ2 は、第１蒸発燃料通路３の通気抵抗
Ｒ1 より２倍以上大きいことが望ましい。The ventilation resistance R 2 of the second evaporated fuel passage 22 is
For example, by making the passage diameter small, it is set to be larger than the ventilation resistance R 1 of the first evaporated fuel passage 3. When the ventilation resistance R 2 of the second evaporated fuel passage 22 is increased, the amount of evaporated fuel flowing to the second evaporated fuel passage 22 side out of the evaporated fuel generated in the tank body 1 at the time of refueling by the refueling gun G is suppressed. As shown in FIG. 3, as the ratio of the ventilation resistance R 2 of the second evaporated fuel passage 22 to the ventilation resistance R 1 of the first evaporated fuel passage 3 increases, the evaporation from the oil supply pipe 2 to the outside is increased. The amount of fuel released decreases. Here, the evaporative fuel release amount becomes equal to or lower than the allowable level L when the ventilation resistance ratio (R 2 / R 1 ) is 2 or more, and the ventilation resistance R 2 of the second evaporated fuel passage 22 is equal to the first evaporated fuel passage. It is desirable that the air flow resistance R 1 of 3 is twice or more.
【手続補正３】[Procedure 3]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００２１[Correction target item name] 0021
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００２１】ところで、図５で示す第１変形例のよう
に、第２蒸発燃料通路２２の入口部２ａ内への開口端２
２ａ2 が、斜めに切断されて斜め下方に向くように形成
されたものであってもよく、図６で示す第２変形例のよ
うに、第２蒸発燃料通路２２の入口部２ａ内への開口端
２２ａ3 が略Ｕ状に屈曲されて下方を向くように形成さ
れたものであってもよく、さらに図７で示す第３変形例
のように、第２蒸発燃料通路２２の入口部２ａ内への開
口端２２ａ4 が入口部２ａにほぼ直角に接続されるもの
の、開口端２２ａの上方で入口部２ａの内面に邪魔板２
３が設けられるようにしてもよい。By the way, as in the first modification shown in FIG. 5, the opening end 2 into the inlet portion 2a of the second evaporated fuel passage 22 is formed.
2a 2 may be cut obliquely may be one that is formed so as to face obliquely downward, as in a second modification shown in FIG. 6, to the inlet portion 2a of the second evaporative fuel path 22 The opening end 22a 3 may be formed so as to be bent in a substantially U shape so as to face downward. Further, as in the third modification shown in FIG. 7, the inlet portion 2a of the second evaporated fuel passage 22 may be formed. Although the opening end 22a 4 into the inside is connected to the entrance portion 2a at a substantially right angle, the baffle plate 2 is provided on the inside surface of the entrance portion 2a above the opening end 22a.
3 may be provided.
【手続補正４】[Procedure amendment 4]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００２３[Name of item to be corrected] 0023
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００２３】[0023]
【発明の効果】以上のように請求項１記載の発明によれ
ば、給油管の入口部およびタンク本体間を結ぶ第２蒸発
燃料通路の通気抵抗が、タンク本体およびキャニスタ間
を結ぶ第１蒸発燃料通路の通気抵抗よりも大きく設定さ
れるので、従来用いていたシールを用いることなく、給
油時のタンク本体内への新気の巻き込みを抑えてキャニ
スタの容量増大を回避しつつ、第２蒸発燃料通路に導か
れる蒸発燃料量を抑えて、蒸発燃料の外部放出を抑制す
ることができる。As described above, according to the first aspect of the present invention, the ventilation resistance of the second vaporized fuel passage connecting the inlet of the fuel supply pipe and the tank main body has the first vaporization connecting the tank main body and the canister. Since it is set to be higher than the ventilation resistance of the fuel passage, it does not use the seal that has been used in the past, and prevents the intake of fresh air into the tank body during refueling, avoiding an increase in the capacity of the canister and avoiding the second evaporation. It is possible to suppress the amount of evaporated fuel introduced into the fuel passage and suppress the external release of evaporated fuel.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ６０Ｋ 15/04 Ｆ０２Ｍ 37/00 ３０１ Ｇ ３１１ Ａ ３２１ Ｚ (72)発明者 堀内 正昭 埼玉県和光市中央１丁目４番１号 株式会 社本田技術研究所内─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 6 Identification number Office reference number FI technical display location B60K 15/04 F02M 37/00 301 G 311 A 321 Z (72) Inventor Masaaki Horiuchi Wako, Saitama Prefecture Chuo 1-4-1 Stock Company Honda Technical Research Institute
Claims (3)
体（１）に設けられて成る燃料タンク（Ｔ）からの給油
時の蒸発燃料放出を抑制する蒸発燃料放出抑制装置であ
って、タンク本体（１）からの蒸発燃料を吸着するキャ
ニスタ（Ｃ）と、タンク本体（１）およびキャニスタ
（Ｃ）間を結ぶ第１蒸発燃料通路（３）と、給油管
（２）の入口部（２ａ）およびタンク本体（１）間を結
ぶ第２蒸発燃料通路（２２）とを備え、第２蒸発燃料通
路（２２）の通気抵抗が第１蒸発燃料通路（３）の通気
抵抗よりも大きく設定されることを特徴とする蒸発燃料
放出抑制装置。1. An evaporative fuel emission suppressing device for suppressing evaporative fuel emission during refueling from a fuel tank (T) having an oil supply pipe (2) extending upwardly provided in a tank body (1). , A canister (C) for adsorbing evaporated fuel from the tank body (1), a first evaporated fuel passage (3) connecting the tank body (1) and the canister (C), and an inlet portion of the oil supply pipe (2) (2a) and a second evaporated fuel passage (22) connecting between the tank body (1), and the ventilation resistance of the second evaporated fuel passage (22) is larger than that of the first evaporated fuel passage (3). An evaporative emission control device that is set.
（１）への接続部には、タンク本体（１）内の燃料液面
が最高レベルとなるのに応じて閉弁して第１蒸発燃料通
路（３）を閉鎖する弁（６）が設けられ、第２蒸発燃料
通路（２２）は、前記弁（６）よりも下流側で第１蒸発
燃料通路（３）から分岐されることを特徴とする請求項
１記載の蒸発燃料放出抑制装置。2. The connection portion of the first evaporative fuel passage (3) to the tank body (1) is closed when the fuel liquid level in the tank body (1) reaches the maximum level. A valve (6) for closing the first evaporated fuel passage (3) is provided, and the second evaporated fuel passage (22) is branched from the first evaporated fuel passage (3) on the downstream side of the valve (6). The evaporated fuel emission suppressing device according to claim 1, characterized in that.
油ガン（Ｇ）の給油管（２）への挿入に応じて開くシャ
ッタ（１７）が設けられ、第２蒸発燃料通路（２２）
は、前記シャッタ（１７）よりもタンク本体（１）側で
給油管（２）に接続されることを特徴とする請求項１記
載の蒸発燃料放出抑制装置。3. An inlet (2a) of the oil supply pipe (2) is provided with a shutter (17) which opens in response to insertion of the oil supply gun (G) into the oil supply pipe (2), and a second evaporated fuel passage. (22)
Is connected to the oil supply pipe (2) on the tank body (1) side of the shutter (17).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15710594A JP3158170B2 (en) | 1994-07-08 | 1994-07-08 | Evaporative fuel emission control device |
| US08/362,267 US5606954A (en) | 1993-12-22 | 1994-12-22 | Evaporative fuel processing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15710594A JP3158170B2 (en) | 1994-07-08 | 1994-07-08 | Evaporative fuel emission control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0821317A true JPH0821317A (en) | 1996-01-23 |
| JP3158170B2 JP3158170B2 (en) | 2001-04-23 |
Family
ID=15642346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15710594A Expired - Fee Related JP3158170B2 (en) | 1993-12-22 | 1994-07-08 | Evaporative fuel emission control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3158170B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09256923A (en) * | 1996-03-21 | 1997-09-30 | Nissan Motor Co Ltd | Fuel tank device |
| US6851458B2 (en) | 2001-08-21 | 2005-02-08 | Honda Giken Kogyo Kabushiki Kaisha | On board refueling vapor recovery system and fuel vapor passage using for the same |
| US6857454B2 (en) | 2002-04-10 | 2005-02-22 | Honda Giken Kogyo Kabushiki Kaisha | Evaporated-fuel storage system |
| JP2005313667A (en) * | 2004-04-27 | 2005-11-10 | Honda Motor Co Ltd | Filler pipe structure |
| JP2005335691A (en) * | 2004-05-28 | 2005-12-08 | Ti Group Automotive Systems Llc | Vapor recovery device in refueling |
| JP2007191145A (en) * | 2006-01-20 | 2007-08-02 | Eaton Corp | Filler tube assembly for fuel vapor recirculation system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4608377B2 (en) * | 2004-09-28 | 2011-01-12 | 本田技研工業株式会社 | Evaporative fuel emission suppression device |
-
1994
- 1994-07-08 JP JP15710594A patent/JP3158170B2/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09256923A (en) * | 1996-03-21 | 1997-09-30 | Nissan Motor Co Ltd | Fuel tank device |
| US6851458B2 (en) | 2001-08-21 | 2005-02-08 | Honda Giken Kogyo Kabushiki Kaisha | On board refueling vapor recovery system and fuel vapor passage using for the same |
| US6857454B2 (en) | 2002-04-10 | 2005-02-22 | Honda Giken Kogyo Kabushiki Kaisha | Evaporated-fuel storage system |
| JP2005313667A (en) * | 2004-04-27 | 2005-11-10 | Honda Motor Co Ltd | Filler pipe structure |
| US7100645B2 (en) | 2004-04-27 | 2006-09-05 | Honda Motor Co., Ltd. | Filler pipe structure |
| JP4690663B2 (en) * | 2004-04-27 | 2011-06-01 | 本田技研工業株式会社 | Filler pipe structure |
| JP2005335691A (en) * | 2004-05-28 | 2005-12-08 | Ti Group Automotive Systems Llc | Vapor recovery device in refueling |
| JP2007191145A (en) * | 2006-01-20 | 2007-08-02 | Eaton Corp | Filler tube assembly for fuel vapor recirculation system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3158170B2 (en) | 2001-04-23 |
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