JPH0563330B2 - - Google Patents
Info
- Publication number
- JPH0563330B2 JPH0563330B2 JP60132476A JP13247685A JPH0563330B2 JP H0563330 B2 JPH0563330 B2 JP H0563330B2 JP 60132476 A JP60132476 A JP 60132476A JP 13247685 A JP13247685 A JP 13247685A JP H0563330 B2 JPH0563330 B2 JP H0563330B2
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- tube
- canister
- tank body
- evaporative
- 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.)
- Expired - Lifetime
Links
- 239000000446 fuel Substances 0.000 claims description 73
- 239000007788 liquid Substances 0.000 claims description 7
- 239000002828 fuel tank Substances 0.000 claims description 5
- 230000008020 evaporation Effects 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 3
- 239000000945 filler Substances 0.000 description 9
- 238000004891 communication Methods 0.000 description 6
- 238000009423 ventilation Methods 0.000 description 4
- 230000002265 prevention Effects 0.000 description 3
- 238000010926 purge Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K15/035—Fuel tanks characterised by venting means
- B60K15/03504—Fuel tanks characterised by venting means adapted to avoid loss of fuel or fuel vapour, e.g. with vapour recovery systems
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
- Details Of Rigid Or Semi-Rigid Containers (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は車両用燃料タンクの蒸発燃料流出防止
装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an evaporative fuel spill prevention device for a vehicle fuel tank.
従来の技術
自動車等の車両用の燃料タンクにあつては、タ
ンク本体内に発生した蒸発燃料をエバポチユーブ
でキヤニスタに導出、吸着させ、該キヤニスタよ
リパージ空気と共に蒸発燃料をエンジン吸気系に
供給して蒸発燃料の処理を行えるようにしてある
が、燃料の給油時にはフイラーチユーブの充填口
から蒸発燃料が流出して大気を汚染してしまう問
題が指摘されている（実開昭50−3119号公報参
照）。このようなことから最近では燃料の満杯規
制をするベントチユーブをキヤニスタを介して大
気に連通する一方、フイラーチユーブ充填口の給
油ガン挿入部周りをシールして、給油に支障を来
すことなく蒸発燃料の外部流出防止を徹底させる
提案がなされている。これを、第４図によつて具
体的に説明すると、１はタンク本体を示し、該タ
ンク本体１の上壁にはキヤニスタ５に連通したエ
バポチユーブ３を接続してあり、タンク本体１内
に発生した蒸発燃料をエバポチユーブ３でキヤニ
スタ５に導出し、該キヤニスタ５よりパージ空気
と共に蒸発燃料を図外のエンジン吸気系に供給し
処理できるようになつている。４はタンク本体１
上壁を貫通して該タンク本体１内に突出配置した
ベントチユーブを示し、このベントチユーブ４は
一般にはフイラーチユーブ２のネツク部に連通さ
れるのであるが、該ベントチユーブ４をキヤニス
タ６を介して大気に連通させている。一方、前記
フイラーチユーブ２の充填口２ａは、給油ガン７
を挿入した時に図外のシール部材により給油ガン
７の挿入部周りをシールできるようにしてある。BACKGROUND TECHNOLOGY In the case of fuel tanks for vehicles such as automobiles, evaporated fuel generated in the tank body is led to a canister using an evaporative tube and adsorbed therein, and the evaporated fuel is supplied to the engine intake system along with repurge air from the canister. Although it is designed to process evaporated fuel, it has been pointed out that when refueling, evaporated fuel flows out from the filling port of the filler tube and pollutes the atmosphere (see Utility Model Application Publication No. 50-3119). ). For this reason, recently, the vent tube that regulates the fullness of fuel is communicated with the atmosphere through the canister, and the area around the filler tube filling port where the fuel gun is inserted is sealed, allowing evaporation to occur without interfering with fuel supply. Proposals have been made to thoroughly prevent fuel leakage to the outside. To explain this in detail with reference to FIG. 4, reference numeral 1 indicates a tank body, and an evaporative tube 3 that communicates with a canister 5 is connected to the upper wall of the tank body 1. The evaporated fuel is led to a canister 5 through an evaporative tube 3, and from the canister 5, the evaporated fuel is supplied together with purge air to an engine intake system (not shown) for processing. 4 is the tank body 1
A vent tube 4 is shown that penetrates the upper wall and protrudes into the tank body 1. Although the vent tube 4 is generally connected to the neck of the filler tube 2, it is possible to connect the vent tube 4 through the canister 6. It communicates with the atmosphere. On the other hand, the filling port 2a of the filler tube 2 is connected to the fuel gun 7.
When the refueling gun 7 is inserted, the area around the insertion portion of the refueling gun 7 can be sealed by a sealing member (not shown).
以上の構成により、給油時にはキヤニスタ６を
介してベントチユーブ４によるベント作用を確保
した上で、フイラーチユーブ充填口２ａからの蒸
発燃料の外部流出を阻止し、また、タンク本体１
内に発生した蒸発燃料はエバポチユーブ３、ベン
トチユーブ４によりキヤニスタ５，６に導出し、
該キヤニスタ５，６よりパージ空気と共に図外の
エンジン吸気系に供給、処理しようとするもので
ある。 With the above configuration, during refueling, the venting action of the vent tube 4 is ensured via the canister 6, and the evaporated fuel is prevented from flowing out from the filler tube filling port 2a, and the tank body 1
The evaporated fuel generated in the canister is led out to the canisters 5 and 6 through the evaporative tube 3 and the vent tube 4.
The purge air is supplied from the canisters 5 and 6 to an engine intake system (not shown) for processing.
発明が解決しようとする問題点
給油時に給油ガン７よりタンク本体１内に燃料
が給油されて液面でベントチユーブ４端が塞がれ
ることにより満杯量を規制するのであるが、フイ
ラーチユーブ２の燃料水頭Ｈによつてベントチユ
ーブ４には該フイラーチユーブ２の燃料液位と同
レベルにまで燃料が流入し、この燃料が走行時振
動等によつてキヤニスタ６に流出し、該キヤニス
タ６で燃料が吸着しきれずに外部に漏出してしま
う不具合を生じる。そこで、本発明はタンク本体
内の燃料がベントチユーブを経由して外部へ漏出
することのない車両用燃料タンクの蒸発燃料流出
防止装置を提供するものである。Problems to be Solved by the Invention During refueling, fuel is supplied into the tank body 1 from the refueling gun 7, and the liquid level closes the 4 ends of the vent tube, thereby regulating the full amount. Due to the fuel head H, fuel flows into the vent tube 4 to the same level as the fuel level in the filler tube 2, and this fuel flows out to the canister 6 due to vibrations during driving, etc., and the fuel flows in the canister 6. This causes a problem in which the liquid cannot be completely absorbed and leaks to the outside. SUMMARY OF THE INVENTION Therefore, the present invention provides an evaporative fuel leakage prevention device for a vehicle fuel tank, which prevents the fuel inside the tank body from leaking to the outside via a vent tube.
問題点を解決するための手段
ベントチユーブよりキヤニスタに連通したエバ
ポチユーブを分岐して形成する一方、ベントチユ
ーブのタンク本体内突出端部にタンク本体内の燃
料が所定液位となると閉弁作動するフロート弁を
付設してある。また、この突出端部の上部に通気
孔を形成し、かつ、該通気孔形成部分を複数個の
連通孔を有するセパレータで囲繞し、更に、前記
ベントチユーブのエバポチユーブとの分岐部とキ
ヤニスタとの間に、蒸発燃料のキヤニスタ側への
流出を許容する１ウエイバルブを設けると共に、
エバポチユーブのベントチユーブとの分岐部とキ
ヤニスタとの間に、蒸発燃料のキヤニスタ側への
流出と、外気のタンク本体側への流入とをそれぞ
れ許容する２ウエイバルブを介装し、この２ウエ
イバルブの蒸発燃料流出側の開弁圧を１ウエイバ
ルブの開弁圧よりも低く設定してある。Measures to solve the problem An evaporative tube connected to the canister is branched from the vent tube, and a float is installed at the protruding end of the vent tube inside the tank body to close the valve when the fuel in the tank body reaches a predetermined level. A valve is attached. Further, a ventilation hole is formed in the upper part of the projecting end, and the ventilation hole forming part is surrounded by a separator having a plurality of communication holes, and furthermore, the part where the vent tube is connected to the evaporation tube is connected to the canister. In between, a one-way valve is provided to allow the evaporated fuel to flow to the canister side, and
A two-way valve is installed between the branch part of the evaporative tube and the vent tube and the canister to allow the vaporized fuel to flow out to the canister side and to allow outside air to flow into the tank body side. The valve opening pressure on the vaporized fuel outflow side of the valve is set lower than the valve opening pressure of the one-way valve.
作 用
燃料の給油によりタンク本体内の燃料が所定液
位となるとフロート弁が閉弁して満杯量を確実に
規制する。タンク本体内に発生する蒸発燃料は、
給油等にあつてはフロート弁が開弁している間
は、該フロート弁からベントチユーブおよびエバ
ポチユーブを経由してキヤニスタに導出され、フ
ロート弁が閉弁するとセパレータ室および通気孔
を通つてエバポチユーブからの蒸発燃料導出を可
能とする。また、走行時振動やコーナリング等に
よつてタンク本体内の燃料が揺動した場合、フロ
ート弁が燃料を被るとフロート弁が閉弁してベン
トチユーブ突出端部内への燃料の流入を阻止し、
また、セパレータが燃料を被つてもセパレータ内
への燃料流入を連通孔で規制し、通気孔からベン
トチユーブ突出端部内への燃料流入を阻止する。Function: When the fuel in the tank body reaches a predetermined level due to fuel refueling, the float valve closes to reliably regulate the full amount. The evaporated fuel generated inside the tank body is
When refueling, etc., while the float valve is open, the oil is drawn out from the float valve to the canister via the vent tube and evaporative tube, and when the float valve is closed, the oil is drawn out from the evaporative tube through the separator chamber and the vent hole. This makes it possible to derive evaporated fuel. Additionally, if the fuel inside the tank body oscillates due to vibrations or cornering while driving, the float valve will close if it is covered with fuel, preventing fuel from flowing into the protruding end of the vent tube.
Further, even if the separator is covered with fuel, the communication hole restricts the inflow of fuel into the separator, and prevents the fuel from flowing into the protruding end of the vent tube from the vent hole.
実施例
以下、本発明の実施例を図面と共に前記従来の
構成と同一部分に同一符号を付して詳述する。Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, with the same reference numerals assigned to the same parts as in the conventional structure.
第１図において、タンク本体１内に突出配置し
たベントチユーブ４Ａはキヤニスタ６に連通接続
してあり、また、このベントチユーブ４Ａの途中
にはキヤニスタ５に連通したエバポチユーブ３Ａ
を分岐して形成してある。前記ベントチユーブ４
Ａのタンク本体１内の突出端部には、タンク本体
１内の燃料が所定液位となると閉弁作動してベン
トチユーブ４Ａを閉塞するフロート弁１０を付設
してある。このフロート弁１０としては第２図に
も示すように、前記突出端部に径大部４ａを形成
すると共にその周側に通気孔４ｂを形成し、そし
て、該径大部４ａ内に球状のフロート弁体１０ａ
を収容して、該フロート弁体１０ａによりベント
チユーブ４Ａを閉塞するようにしたものや、第３
図に示すように径大部４ａに収容したフロート１
０ｂにニードル弁体１０ｃを突設し、このニード
ル弁体１０ｃによつてベントチユーブ４Ａを閉塞
し得るようにしたもの等が適宜選択使用される。 In FIG. 1, a vent tube 4A protruding from inside the tank body 1 is connected to a canister 6, and an evaporative tube 3A is connected to a canister 5 in the middle of the vent tube 4A.
It is formed by branching out. The vent tube 4
A float valve 10 is attached to the protruding end of the tank body 1 of A, which closes and closes the vent tube 4A when the fuel in the tank body 1 reaches a predetermined level. As shown in FIG. 2, this float valve 10 has a large-diameter portion 4a formed at the projecting end, a vent hole 4b on the circumferential side of the large-diameter portion 4a, and a spherical hole inside the large-diameter portion 4a. Float valve body 10a
, and the vent tube 4A is closed by the float valve body 10a, or the third
Float 1 accommodated in large diameter portion 4a as shown in the figure
A valve having a needle valve body 10c protruding from the needle valve body 10c, which can close the vent tube 4A, is appropriately selected and used.
また、前記突出端部の上部には通気孔１１を形
成してあると共に、この通気孔１１形成部分を、
周壁および底壁に連通孔１２ａを形成したセパレ
ータ１２ａで囲繞してある。８はベントチユーブ
４Ａのエバポチユーブ分岐部とキヤニスタ６間に
介装されて、蒸発燃料のキヤニスタ６側への流出
を許容する１ウエイバルブ、９はエバポチユーブ
３Ａの前記ベントチユーブ４Ａとの分岐部とキヤ
ニスタ５との間に介装されて、蒸発燃料のキヤニ
スタ５側への流出と、外気のタンク本体１側への
流入とをそれぞれ許容する２ウエイバルブで、該
２ウエイバルブ９の蒸発燃料流出側の開弁圧は１
ウエイバルブ８の開弁圧よりも低く設定してあ
る。 Further, a ventilation hole 11 is formed in the upper part of the projecting end, and the portion where the ventilation hole 11 is formed is
It is surrounded by a separator 12a having communication holes 12a formed in the peripheral wall and bottom wall. 8 is a one-way valve that is interposed between the evaporative tube branch of the vent tube 4A and the canister 6 and allows the vaporized fuel to flow out to the canister 6 side; 9 is a one-way valve that is interposed between the evaporative tube branch of the evaporative tube 3A and the canister 6; This is a two-way valve that is interposed between the two-way valve 9 and the fuel vapor outlet side of the two-way valve 9 and allows the vaporized fuel to flow out to the canister 5 side and the outside air to flow into the tank body 1 side. The opening pressure of is 1
The pressure is set lower than the opening pressure of the way valve 8.
以上の実施例構造によれば、燃料給油時におけ
るフイラーチユーブ２の充填口２ａからの蒸発燃
料の流出防止対策として、該充填口２ａの給油ガ
ン７挿入部周りを図外のシール部材でシールして
給油する場合にあつて、ベントチユーブ４Ａは前
述のようにキヤニスタ６を介して大気に連通して
いるため、該ベントチーブ４Ａによるベント作用
は十分に確保され、燃料の給油をスムースに行わ
せることができる。この燃料給油時にタンク本体
１内の上部空間Ｓに滞留する蒸発燃料は、フロー
ト弁１０が閉弁するまでは該フロート弁１０から
ベントチユーブ４Ａおよびエバポチユーブ３Ａを
通つてキヤニスタ６，５に導出され、これらキヤ
ニスタ６，５に吸着された蒸発燃料はパージ空気
と共に図外のエンジン吸気系に供給されて処理さ
れる。そして、タンク本体１内の燃料が所定液位
となるとフロート弁１０が閉弁作動して満杯量を
確実に規制する。この満杯量が規制された後にも
フイラーチユーブ２のネツク部近くにまで燃料が
給油されても、前述のようにベントチユーブ４Ａ
のタンク本体内突出端部はフロート弁１０によつ
て閉塞されているため、該ベントチユーブ４Ａ内
に燃料が流入することはない。爾後、タンク本体
１の上部空間Ｓに発生する蒸発燃料は、フロート
弁１０が閉弁している間はセパレータ１２の連通
孔１２ａよりセパレータ１２内に流入し、通気孔
１１よりベントチユーブ４Ａのタンク本体内突出
端部に流入し、エバポチユーブ３Ａを経由してキ
ヤニスタ５に導出される。蒸発燃料圧力が１ウエ
イバルブ８の開弁圧よりも上昇した場合にはベン
トチユーブ４Ａからもキヤニスタ６に導出され
る。また、燃料液位が下がつてフロート弁１０が
開弁すると蒸発燃料は該フロート弁１０を通つて
前述のようにキヤニスタ５または５，６に導出さ
れる。ここで、走行時振動やコーナリング時にタ
ンク内燃料が揺動した場合、フロート弁１０が燃
料を被るとフロート弁１０が閉弁してベントチユ
ーブ突出端部内への燃料の流入を阻止し、また、
セパレータ１２が燃料を被つても連通孔１２ａで
セパレータ１２内への燃料流入を規制するので通
気孔１１からの燃料流入を阻止することができ、
従つて、燃料液動によるエバポチユーブ３Ａある
いはベントチユーブ４Ａからの燃料流出を確実に
防止することができる。また、２ウエイバルブ９
の蒸発燃料流出側の開弁圧を１ウエイバルブ８の
開弁圧よりも低く設定してあるので、常態にあつ
ては蒸発燃料はエバポチユーブ３Ａからのみ放出
され、ベントチユーブ４Ａからの放出は防止され
ており、過剰なガス抜けを防ぐことができる。な
お、前述したフロート弁１０のケーシングを構成
する径大部４ａのシヨルダー部４ｃは、コーナリ
ング時に液面が最大に傾斜してシヨルダー部４ｃ
に接近した時、上昇した弁体１０ａ，１０ｃがベ
ントチユーブ４Ａのタンク本体内突出端部に確実
に案内されるように液面最大傾斜角度よりも大き
な傾斜角度に設定しておくことが望ましい。 According to the structure of the above embodiment, as a measure to prevent evaporated fuel from flowing out from the filling port 2a of the filler tube 2 during refueling, the area around the insertion portion of the fuel gun 7 in the filling port 2a is sealed with a sealing member (not shown). When refueling is carried out, the vent tube 4A is communicated with the atmosphere via the canister 6 as described above, so that the venting action by the vent tube 4A is sufficiently ensured, and the fuel can be refueled smoothly. I can do it. The evaporative fuel that remains in the upper space S in the tank body 1 during fuel refueling is led out from the float valve 10 through the vent tube 4A and the evaporative tube 3A to the canisters 6 and 5 until the float valve 10 closes. The evaporated fuel adsorbed by these canisters 6 and 5 is supplied together with purge air to an engine intake system (not shown) and processed. When the fuel in the tank body 1 reaches a predetermined level, the float valve 10 closes to reliably regulate the full amount. Even after this full amount is regulated, even if fuel is supplied to the vicinity of the neck part of filler tube 2, the vent tube 4A
Since the projecting end within the tank body is closed by the float valve 10, fuel will not flow into the vent tube 4A. Thereafter, while the float valve 10 is closed, the vaporized fuel generated in the upper space S of the tank body 1 flows into the separator 12 through the communication hole 12a of the separator 12, and flows into the tank of the vent tube 4A through the vent hole 11. It flows into the protruding end within the main body and is led out to the canister 5 via the evaporative tube 3A. When the vaporized fuel pressure rises above the opening pressure of the one-way valve 8, the vaporized fuel is also led out to the canister 6 from the vent tube 4A. Further, when the fuel level drops and the float valve 10 opens, the evaporated fuel is led out to the canister 5 or 5, 6 through the float valve 10 as described above. Here, if the fuel in the tank oscillates during vibrations during driving or cornering, if the float valve 10 is covered with fuel, the float valve 10 closes and prevents the fuel from flowing into the protruding end of the vent tube.
Even if the separator 12 is covered with fuel, the communication hole 12a restricts the inflow of fuel into the separator 12, so fuel inflow from the vent hole 11 can be prevented.
Therefore, it is possible to reliably prevent fuel from flowing out from the evaporative tube 3A or the vent tube 4A due to fuel liquid movement. In addition, 2-way valve 9
Since the valve opening pressure on the evaporative fuel outflow side of the valve is set lower than the opening pressure of the one-way valve 8, under normal conditions, evaporative fuel is released only from the evaporative tube 3A, and is prevented from being released from the vent tube 4A. This prevents excessive gas release. Note that the shoulder portion 4c of the large diameter portion 4a constituting the casing of the float valve 10 described above is such that the liquid level inclines to the maximum during cornering and the shoulder portion 4c
It is desirable to set the inclination angle to be larger than the maximum inclination angle of the liquid level so that when the valve body 10a, 10c approaches the tank body, the elevated valve bodies 10a, 10c are reliably guided to the protruding end of the vent tube 4A inside the tank body.
発明の効果
以上のように本発明によれば、キヤニスタに連
通したベントチユーブのタンク本体内突出端部に
フロート弁を付設してあるため、該フロート弁に
よつて満杯量を確実に規制できる。また、エバポ
チユーブをベントチユーブより分岐して一体に形
成してタンク本体へのチユーブ取付点を１つにし
てあるため、組付作業工数を低減できてコストダ
ウンに大きく寄与することができることはもとよ
り、チユーブ取付点が１つになることによつて、
シール部材、取付部材の付設によるタンク本体の
チユーブ取付部周りの形状変化に伴う応力集中部
分を少なくすることができて安全性を向上できる
と共に、燃料タンクの製造性を向上することがで
きる。また、ベントチユーブのタンク本体内突出
端部の上部に形成した通気孔をセパレータで囲繞
してあるため、コーナリング時等の燃料の大きな
液動によつてもフロート弁との協働によりこれら
ベントチユーブ、エバポチユーブからの燃料流出
を確実に防止することができる。更には、エバポ
チユーブに設けた２ウエイバルブの蒸発燃料流出
側の開弁圧を、ベントチユーブに設けた１ウエイ
バルブの開弁圧よりも低く設定してあるので、常
態にあつては蒸発燃料はエバポチユーブからのみ
放出され、ベントチユーブからの放出を抑制でき
て過剰なガス抜けを防止することができる。従つ
て、大気汚染防止対策と安全対策を徹底すること
ができるという実用上多大な効果を有する。Effects of the Invention As described above, according to the present invention, since the float valve is attached to the protruding end within the tank body of the vent tube communicating with the canister, the full amount can be reliably regulated by the float valve. In addition, since the evaporative tube is branched from the vent tube and is integrally formed, there is only one point for attaching the tube to the tank body, which not only reduces the number of assembly steps, but also greatly contributes to cost reduction. By having only one tube attachment point,
By attaching the sealing member and the mounting member, it is possible to reduce the stress concentration area due to the shape change around the tube mounting portion of the tank body, thereby improving safety and improving the manufacturability of the fuel tank. In addition, the vent tube formed at the top of the protruding end inside the tank body is surrounded by a separator, so even if there is a large liquid movement of fuel during cornering, these vent tubes can be closed in cooperation with the float valve. , fuel leakage from the evaporative tube can be reliably prevented. Furthermore, the opening pressure on the evaporated fuel outflow side of the 2-way valve installed in the evaporative tube is set lower than the opening pressure of the 1-way valve installed in the vent tube, so under normal conditions, evaporated fuel flows out. It is released only from the evaporative tube, and the release from the vent tube can be suppressed, thereby preventing excessive gas release. Therefore, it has a great practical effect in that air pollution prevention measures and safety measures can be thoroughly implemented.
第１図は本発明の一実施例を示す断面図、第２
図はフロート弁の断面図、第３図はフロート弁の
異なる例を示す断面図、第４図は従来の構造を示
す断面図である。
１……タンク本体、２……フイラーチユーブ、
３Ａ……エバポチユーブ、４Ａ……ベントチユー
ブ、５，６……キヤニスタ、８……１ウエイバル
ブ、９……２ウエイバルブ、１０……フロート
弁、１１……通気孔、１２……セパレータ、１２
ａ……連通孔。
FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
The figure is a sectional view of a float valve, FIG. 3 is a sectional view showing a different example of the float valve, and FIG. 4 is a sectional view showing a conventional structure. 1...tank body, 2...filler tube,
3A... Evaporative tube, 4A... Vent tube, 5, 6... Canister, 8... 1 way valve, 9... 2 way valve, 10... Float valve, 11... Vent hole, 12... Separator, 12
a...Communication hole.
Claims (1)
をキヤニスタに連通すると共に、該ベントチユー
ブよりキヤニスタに連通したエバポチユーブを分
岐して形成する一方、ベントチユーブのタンク本
体内突出端部にタンク本体内の燃料が所定液位と
なると閉弁作動するフロート弁を付設すると共
に、該突出端部の上部に通気孔を形成し、かつ、
該通気孔形成部分を複数個の連通孔を有するセパ
レータで囲繞し、更に、前記ベントチユーブのエ
バポチユーブとの分岐部とキヤニスタとの間に蒸
発燃料のキヤニスタ側への流出を許容する１ウエ
イバルブを設けると共に、エバポチユーブのベン
トチユーブとの分岐部とキヤニスタとの間に、蒸
発燃料のキヤニスタ側への流出と、外気のタンク
本体側への流入とをそれぞれ許容する２ウエイバ
ルブを介装し、この２ウエイバルブの蒸発燃料流
出側の開弁圧を１ウエイバルブの開弁圧よりも低
く設定したことを特徴とする車両用燃料タンクの
蒸発燃料流出膨出装置。1. A vent tube bulging inside the tank body is communicated with the canister, and an evaporation tube connected to the canister is branched from the vent tube, and the protruding end of the vent tube inside the tank body is connected to the fuel inside the tank body. a float valve that closes when the liquid level reaches a predetermined level, and a vent hole is formed in the upper part of the projecting end, and
The vent hole forming portion is surrounded by a separator having a plurality of communicating holes, and a one-way valve is further provided between the branch part of the vent tube and the evaporative tube and the canister to allow the vaporized fuel to flow out to the canister side. In addition, a two-way valve is interposed between the branch part of the evaporative tube and the vent tube and the canister to allow evaporated fuel to flow out to the canister side and outside air to flow into the tank body side. 1. An evaporative fuel outflow and expansion device for a vehicle fuel tank, characterized in that a valve opening pressure on the evaporative fuel outflow side of a two-way valve is set lower than an opening pressure of a one-way valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13247685A JPS61291217A (en) | 1985-06-18 | 1985-06-18 | Evaporated-fuel effluence preventing apparatus for fuel tank for vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13247685A JPS61291217A (en) | 1985-06-18 | 1985-06-18 | Evaporated-fuel effluence preventing apparatus for fuel tank for vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61291217A JPS61291217A (en) | 1986-12-22 |
| JPH0563330B2 true JPH0563330B2 (en) | 1993-09-10 |
Family
ID=15082261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13247685A Granted JPS61291217A (en) | 1985-06-18 | 1985-06-18 | Evaporated-fuel effluence preventing apparatus for fuel tank for vehicle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61291217A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07308226A (en) * | 1993-12-06 | 1995-11-28 | Weitech Dewert Gmbh | Flat elevation element |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0435197B1 (en) * | 1989-12-25 | 1994-11-23 | Mazda Motor Corporation | Rear body structure of automotive vehicle |
| JPH05254352A (en) * | 1992-03-12 | 1993-10-05 | Aisan Ind Co Ltd | Device for preventing fuel flow-out for fuel tank for vehicle |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5934932A (en) * | 1982-08-21 | 1984-02-25 | Nissan Motor Co Ltd | Separation chamber structure of fuel tank |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS48108010U (en) * | 1972-03-18 | 1973-12-13 | ||
| JPS52114116U (en) * | 1976-02-27 | 1977-08-30 |
-
1985
- 1985-06-18 JP JP13247685A patent/JPS61291217A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5934932A (en) * | 1982-08-21 | 1984-02-25 | Nissan Motor Co Ltd | Separation chamber structure of fuel tank |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07308226A (en) * | 1993-12-06 | 1995-11-28 | Weitech Dewert Gmbh | Flat elevation element |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61291217A (en) | 1986-12-22 |
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