【０００１】[0001]
この考案は車両の燃料蒸気処理装置に使用されるチエック弁の改良に関する。 The present invention relates to an improvement of a check valve used in a fuel vapor processing device of a vehicle.
【０００２】[0002]
殆どの車両では、公害対策上図４のように燃料タンクＴとキヤニスタＣとを途 中にチエック弁Ｖを配設したベンチレーション通路Ｌ1 で結ぶ一方、キヤニスタ Ｃをパージ通路Ｌ2 によりエンジンＥの吸気管Ｋに付設されコントロールユニッ トＵで制御されるパージ制御弁Ｖ′に結び、車両の停止時や給油時に燃料タンク Ｔ内に生じる燃料蒸気をベンチレーション通路Ｌ1 でキヤニスタＣに導いて活性 炭等の吸着材Ｃａに吸着させ、車両の走行時にエンジンＥの作動状態に応じて制 御弁Ｖ′の開度をコントロールユニットＵにより制御しつつキヤニスタＣ内の吸 着燃料を尾端パイプＣｂから大気取入れのもとに吸気管Ｋに送り込むようにして いる。In most vehicles, as shown in FIG. 4, the fuel tank T and the canister C are connected to each other by a ventilation passage L1 provided with a check valve V while the canister C is connected to the engine E by a purge passage L2 as shown in FIG. It is connected to a purge control valve V ′ attached to the intake pipe K of the vehicle and controlled by the control unit U, and guides fuel vapor generated in the fuel tank T to the canister C in the ventilation passage L1 when the vehicle is stopped or refueled. The adsorbed fuel in the canister C is adsorbed by an adsorbent Ca such as activated carbon and the adsorbed fuel in the canister C is controlled by the control unit U while controlling the opening degree of the control valve V'according to the operating state of the engine E when the vehicle is running. The air is taken in from Cb to the intake pipe K under intake of the atmosphere.
【０００３】 本出願人は上記ベンチレーション通路Ｌ1 の配設されるチエック弁Ｖの一つと して図５のようなものを先に提案した。即ち合成樹脂又は軽金属からなるコップ 状のボデー１は低部一側にベンチレーション通路Ｌ1 を介して燃料タンクＴにつ ながる第１パイプ１ａを有すると共に他側には同じくベンチレーション通路Ｌ1 によりキヤニスタＣにつながる第２パイプ１ｂを備え、ホデー１内の中央部には 周壁より若干低い筒柱１ｃを設け、筒柱１ｃと第２パイプ１ｂの間には両者に通 じる横通孔２ａを備えた台部２を設け、台部２の上半部には横通孔２ａに通じる 縦向きの小孔２ｂを設けると共に弾性材製傘形の弁体３を小孔２ｂをおおうよう に取付け、ボデー１上には大気に通じる第３パイプ５ａを備えたカバー５を施す 一方、ボデー１とカバー２との間には中央に肉厚な弁部４ａを持った耐油性のゴ ム材からなるダイヤフラム４を配設し、その周縁部をボデー１の張出しつば１ｄ とカバー５の張り出しつば５ｂの間に挟んで三者一体に固着し、かつ弁部４ａ上 の突部に大径浅皿状のリテーナ金具６を嵌め合せ、カバー５の壁面との間に配設 したコイルばね７により通常には筒柱１ｃの上端を閉じるようにしている。The applicant of the present invention has previously proposed one of the check valves V having the ventilation passage L1 as shown in FIG. That is, the cup-shaped body 1 made of synthetic resin or light metal has the first pipe 1a connected to the fuel tank T through the ventilation passage L1 on one side of the lower portion and the ventilation passage L on the other side as well.A second pipe 1b connected to the canister C by 1 is provided, a cylindrical column 1c slightly lower than the peripheral wall is provided in the center of the body 1, and a horizontal passage that leads to both is provided between the cylindrical column 1c and the second pipe 1b. A base 2 having a hole 2a is provided, and a vertical small hole 2b communicating with the horizontal through hole 2a is provided in the upper half of the base 2 and an elastic material umbrella-shaped valve body 3 is covered with the small hole 2b. The cover 5 having the third pipe 5a communicating with the atmosphere is provided on the body 1 while the body 1 and the cover 2 are provided with an oil-resistant rubber having a thick valve portion 4a in the center. A diaphragm 4 made of aluminum is placed, and its peripheral edge is It is sandwiched between the overhanging collar 1d of 1 and the overhanging collar 5b of the cover 5 and fixed integrally, and the retainer metal fitting 6 in the shape of a large diameter shallow dish is fitted to the protrusion on the valve portion 4a. Usually, the upper end of the cylindrical column 1c is closed by a coil spring 7 arranged between the wall and the wall.
【０００４】 そして、燃料タンクＴ内の蒸気圧が一定以上になれば、その圧力でダイヤフラ ム４の弁部４ａが押し上げられ、タンクＴ内の燃料蒸気がベンチレーション通路 Ｌ1 及びチエッ弁Ｖを介してキヤニスタＣ側に流れ、一方、燃料の減少又は温度 降下によりタンクＴ内が負圧になれば、ダイヤフラム弁部４ａは筒柱１ｃを閉じ たままで傘形弁体３が反り返って、タンク負圧が小孔２ｂ，第２パイプ１ｂ，通 路Ｌ1 を介しキヤニスタＣに伝わり、キヤニスタＣの尾端パイプＣｂから空気が 取入れられて燃料タンクＴに送り込まれ、又、車両の走行時において、燃料のパ ージ状態やキヤニスタＣ中の圧力損失により、キヤニスタＣのベンチレーション 通路Ｌ1 の連結端側に大きな負圧が生じた際、これが通路Ｌ1 をチエック弁側に 伝わることになるが、傘形弁体３及びダイヤフラム４によりこれを遮断して燃料 タンクＴには伝わらないようになされている。When the vapor pressure in the fuel tank T exceeds a certain level, the valve portion 4a of the diaphragm 4 is pushed up by the pressure, and the fuel vapor in the tank T passes through the ventilation passage L1 and the check valve V. If the pressure in the tank T becomes negative due to the decrease in fuel or the temperature drop, the diaphragm valve portion 4a warps the umbrella-shaped valve element 3 with the cylinder column 1c closed, and the tank valve is closed. The pressure is transmitted to the canister C through the small hole 2b, the second pipe 1b, and the passage L1, and the air is taken from the tail end pipe Cb of the canister C and sent to the fuel tank T. Also, when the vehicle is running, the pressure loss of the path over di state or in Kiyanisuta C of the fuel, when a large negative pressure occurs in the connection end side of the ventilation passage L1 of Kiyanisuta C, which Tsutawa passage L1 on the check valve side Thereby, but adapted it not transmitted to the fuel tank T by blocking Thus the umbrella valve body 3 and the diaphragm 4.
【０００５】[0005]
ところで、上記チエック弁は燃料タンクの破損を適切に防ぐ利点を有している が、内部がブタジエンアクリロニトリルゴム（ＮＢＲ）のような耐油性のゴム材 からなるダイヤフラムにより二部分に仕切られ、このゴム製のダイヤフラムは燃 料蒸気が透過する傾向があり、そして、ダイヤフラムの上側に当たるカバー内部 は第３のパイプを介して大気に連通しているため、使用時にボデー内部を通過す る燃料蒸気の一部がカバー内に入り、第３パイプから大気中に飛散する恐れがあ る。 By the way, the above-mentioned check valve has the advantage of appropriately preventing damage to the fuel tank, but the inside is partitioned into two parts by a diaphragm made of an oil-resistant rubber material such as butadiene acrylonitrile rubber (NBR). The made diaphragm tends to allow the permeation of fuel vapor, and since the inside of the cover, which is the upper side of the diaphragm, communicates with the atmosphere through the third pipe, one of the fuel vapor that passes through the inside of the body during use is The part may enter the cover and scatter from the third pipe into the atmosphere.
【０００６】 そこで、この考案は燃料タンクの破損を防ぐと同時にチエック弁からの燃料蒸 気の散逸を防止することを目的とする。Therefore, an object of the present invention is to prevent damage to the fuel tank and at the same time to prevent dissipation of fuel vapor from the check valve.
【０００７】[0007]
上記目的のもとにこの考案は、コップ状のボデーの底部一側に燃料タンクにつ なぐ第１パイプを設けると共に他側にはキヤニスタにつなぐ第２パイプを設け、 ボデー内中央部には筒柱を設け、筒柱と第２パイプを連通する台部にはボデー内 の空所側にのみ開く弁部材を設け、ボデー上には大気に通じる第３のパイプを有 するカバーを施すと共にカバーとボデーとの間にはダイヤフラムを配設し、その 中央の弁部をコイルばねによりボデー側筒柱の上端に圧接させるようにした燃料 蒸気処理装置用のチエック弁として、ダイヤフラムの表面にポリイミド系又はポ リビニルアルコール系等の燃料蒸気透過性の小さな合成樹脂フイルムを被着した ことを特徴としている。 Based on the above object, the present invention provides a first pipe connected to a fuel tank on one side of the bottom of a cup-shaped body, a second pipe connected to a canister on the other side, and a cylinder in the center of the body. A column is provided, and a valve member that opens only to the void side inside the body is provided at the base part that connects the cylindrical column and the second pipe, and a cover with a third pipe that communicates with the atmosphere is provided and covered on the body. A diaphragm is installed between the body and the body, and the valve at the center is pressed against the upper end of the cylinder on the body side by a coil spring. Alternatively, it is characterized by being coated with a synthetic resin film having a low fuel vapor permeability such as polyvinyl alcohol.
【０００８】[0008]
図１，図２はこの考案に係るチエック弁の一例を示すものであり、合成樹脂又 は軽金属からなるコップ状のボデー１１は低部一側にベンチレーション通路Ｌ1 を介して燃料タンクにつながる第１パイプ１１ａを有すると共に他側には同じく ベンチレーション通路Ｌ1 を介してキヤニスタにつながる第２パイプ１１ｂを備 え、ボデー１１内の中央部には周壁より若干低い筒柱１１ｃが立設され、この筒 柱１１ｃと第２パイプ１１ｂの間のボデー低部上には肉厚な台部１２が設けられ ている。1 and 2 show an example of a check valve according to the present invention. A cup-shaped body 11 made of synthetic resin or light metal is connected to a fuel tank through a ventilation passage L1 on one side of a lower portion. It has a first pipe 11a and a second pipe 11b on the other side which is also connected to the canister via a ventilation passage L1, and a cylindrical column 11c which is slightly lower than the peripheral wall is erected in the center of the body 11. A thick base portion 12 is provided on the lower portion of the body between the cylindrical column 11c and the second pipe 11b.
【０００９】 台部１２は筒柱１１ｃの内部と第２パイプ１１ｂに連通する横通孔１２ａを備 えており、台部１２の上半部には横通孔１２ａ及びボデー内空所に通じるように した縦向きの小孔１２ｂが設けられると共にゴム等の弾性材からなる傘形の弁体 １３が小孔１２ｂを上からおおうように取付けられている。しかし、この弁部材 は燃料タンク内に負圧が生じたときには流路を開き、キヤニスタ内に負圧が生じ たときには閉じるものであれば、他のものでもよい。The base 12 is provided with a horizontal through hole 12a that communicates with the inside of the cylindrical column 11c and the second pipe 11b. The upper half of the base 12 is connected to the horizontal through hole 12a and a void in the body. A vertical small hole 12b is provided, and an umbrella-shaped valve body 13 made of an elastic material such as rubber is attached so as to cover the small hole 12b from above. However, any other valve member may be used as long as it opens the flow passage when a negative pressure is generated in the fuel tank and closes it when a negative pressure is generated in the canister.
【００１０】 ボデー１１の上に被嵌されるカバー１５は、ボデー１１と同じく合成樹脂又は 軽金属製で下向き皿状をなしていて、上部一側に第３のパイプ１５ａが突設され ていて大気に通じており、上壁の内面には平面孤状をなす左右一対の下向き突条 １５ｃが設けられている。Like the body 11, the cover 15 fitted on the body 11 is made of synthetic resin or light metal and has a downward dish shape, and a third pipe 15a is provided on one side of the upper portion so as to project to the atmosphere. And a pair of left and right downwardly projecting ridges 15c having a plane arcuate shape are provided on the inner surface of the upper wall.
【００１１】 １４は内部を上下に仕切るようにボデー１１とカバー１５の間に配設される上 述のような耐油性のゴム材からなるダイヤフラムであるが、図２のように中央の 肉厚弁部１４ａの上面はほぞを有することなく平坦に形成されると共にその中央 弁部１４ａから周縁のビード部１４ｃにかけての膜部１４ｂはゆるやかに下向き に湾曲していて、その全表面にはポリイミド系又はポリビニルアルコール系の燃 料透過率の小さな合成樹脂フイルム１８が取付けられており、この樹脂フイルム １８はダイヤフラム１４の柔軟性を損なうことのないように２５ミクロンないし ５０ミクロン程度の厚さのもので、ダイヤフラム主材の加硫時に一体に取付けら れる。Reference numeral 14 denotes a diaphragm made of an oil-resistant rubber material as described above, which is arranged between the body 11 and the cover 15 so as to divide the inside into upper and lower parts. The upper surface of the valve portion 14a is formed flat without having a tenon, and the membrane portion 14b from the central valve portion 14a to the peripheral bead portion 14c is gently curved downward, and the entire surface thereof is made of polyimide-based material. Alternatively, a polyvinyl alcohol-based synthetic resin film 18 having a low fuel transmission rate is attached. The resin film 18 has a thickness of about 25 to 50 microns so as not to impair the flexibility of the diaphragm 14. , It is attached integrally when the main diaphragm material is vulcanized.
【００１２】 そして、ダイヤフラム１４は周縁部がカバー１５下端の張出しつば１５ｂとボ デー１１上端の張出しつば１１ｄの間に挟まれて固着され、その中央の弁部１４ ａの上には小径コップ状のリテーナ金具１６が配設され、揺動しないように上端 部がカバー内面の一対の下向き突条１５ｃの間に嵌め込まれ、このリテーナ金具 １６とカバー１５の上壁との間に所定強さのコイルばね１７が配設され、通常に はそのばね力によってダイヤフラム弁部１４ａでボデー１１内の筒柱１１ｃの上 端を閉じるようになされている。The peripheral edge portion of the diaphragm 14 is sandwiched and fixed between an overhanging collar 15b at the lower end of the cover 15 and an overhanging collar 11d at the upper end of the body 11, and a small-diameter cup-shaped member is formed on the valve portion 14a at the center thereof. The retainer metal fitting 16 is provided, and the upper end portion is fitted between the pair of downward protruding ridges 15c on the inner surface of the cover so as not to swing, and the retainer metal fitting 16 and the upper wall of the cover 15 have a predetermined strength. A coil spring 17 is provided, and the spring force normally closes the upper end of the cylindrical column 11c in the body 11 by the diaphragm valve portion 14a.
【００１３】 そこで、車両の停止時や給油時に燃料タンク内の蒸気圧がコイルばね１７のば ね圧より高くなれば、ダイヤフラ弁部１４ａが押し上げられてボデー１１内の筒 柱１１ｃが開かれ、タンク内の燃料蒸気が第１パイプ１１ａを通ってボデー１１ 内に入り、筒柱１１ｃ，台部の横通孔１２ａ，第２パイプ１１ｂ及びベンチレー ション通路Ｌ1 を順次に通ってキヤニスタに入り、吸着材に吸着される。Therefore, when the vapor pressure in the fuel tank becomes higher than the spring pressure of the coil spring 17 when the vehicle is stopped or refueled, the diaphragm valve portion 14a is pushed up and the cylindrical column 11c in the body 11 is opened. It enters the fuel vapor in the tank within the body 11 through the first pipe 11a, cylindrical pillars 11c, Yokodori hole 12a of the base portion, enters the second pipe 11b and ventilator Deployment passage Kiyanisuta by sequentially through L1, Adsorbed by the adsorbent.
【００１４】 一方、燃料の消費又は温度降下等により、燃料タンク内が負圧になった際には 、ダイヤフラム弁部１４ａが大気圧及びばね圧で筒柱１１ｃを閉じたままで、タ ンク側の負圧が傘形の弁体１３に作用してこれを反転変形させ、その負圧が小孔 １２ｂ，横通孔１２ａ，第２パイプ１１ｂ，通路Ｌ1 を介してキヤニスタに伝わ り、キヤニスタの尾端パイプから空気が取入れられ、上記ラインを逆に通って燃 料タンクに送り込まれ、タンク内の負圧が解消され、タンク内の負圧がなくなれ ば弁体１３が復元して小孔１２ｂを閉じる。On the other hand, when the pressure inside the fuel tank becomes negative due to the consumption of fuel or the temperature drop, the diaphragm valve portion 14a keeps the cylinder column 11c closed by the atmospheric pressure and the spring pressure, and the tank side of the tank side is closed. Negative pressure acts on the umbrella-shaped valve element 13 to reversely deform it, and the negative pressure is transmitted to the canister via the small hole 12b, the lateral passage hole 12a, the second pipe 11b, and the passage L1 , and the canister's Air is taken in from the tail pipe and sent to the fuel tank through the above line in reverse, the negative pressure in the tank is released, and if the negative pressure in the tank disappears, the valve element 13 will be restored and the small hole 12b Close.
【００１５】 又、車両の走行時にはエンジンの運転状態に応じてキヤニスタの吸着材に吸着 された燃料はパージされて吸気管に送り込まれるが、その際、キヤニスタの圧力 損失又は燃料のパージ状態によりキヤニスタのベンチレーション通路及びパージ 通路の連結端側に大きな負圧が発生すれば、それがベンチレーション通路Ｌ1 を 介しチエック弁Ｖに伝わることになるが、チエック弁内の傘形の弁体１３及びダ イヤフラム弁部１４ａが下側に吸引され、流路が遮断されて燃料タンクには伝わ らない。Further, when the vehicle is running, the fuel adsorbed by the adsorbent of the canister is purged and fed into the intake pipe in accordance with the operating state of the engine. At that time, the canister may lose pressure or the fuel may be purged. If a large negative pressure is generated on the connection end side of the ventilation passage and the purging passage, it will be transmitted to the check valve V via the ventilation passage L1 , but the umbrella-shaped valve body 13 and The diaphragm valve portion 14a is sucked downward, the flow passage is blocked, and it does not reach the fuel tank.
【００１６】 上記の過程において、ダイヤフラム１４の裏面は燃料蒸気にさらされることに なるが、ダイヤフラム１４の表面には燃料蒸気が透過しにくい合成樹脂フイルム １８が取付けられているので、ボデー１１内を通る燃料蒸気のカバー１５内に浸 透することが抑制される。In the above process, the back surface of the diaphragm 14 is exposed to the fuel vapor, but since the synthetic resin film 18 through which the fuel vapor does not easily pass is attached to the front surface of the diaphragm 14, the inside of the body 11 is Penetration of the passing fuel vapor into the cover 15 is suppressed.
【００１７】 図３はダイヤフラム弁部１４ａを押圧するコイルばね１７の上端も別のリテー ナ金具１６ａで受けると共にカばー１５の上壁にねじ１９を螺合し、このねじ１ ９によりダイヤフラム１４の開弁圧を微調整できるようにした変更例を示すもの である。In FIG. 3, the upper end of the coil spring 17 that presses the diaphragm valve portion 14 a is also received by another retainer fitting 16 a, and a screw 19 is screwed onto the upper wall of the cover 15, and the diaphragm 14 is screwed by the screw 19. This is an example of a modification in which the valve opening pressure of is finely adjusted.
【００１８】[0018]
以上のようにこの考案は、車両用の燃料蒸気処理装置用のチエック弁として、 上述のような構成を有するので、燃料タンク内に生じる燃料蒸気を確実に吸気管 側に送ることができると共に負圧の発生に基づく燃料タンクの破損を防ぐことが でき、それに併せて、ボデー内を通過する燃料蒸気がダイヤフラムを透過してカ バー内に入るのを適切に抑制することができ、チエック弁から燃料蒸気が放出さ れるのを防ぐことができる。 As described above, the present invention has the above-described structure as a check valve for a fuel vapor processing device for a vehicle, and therefore can reliably send the fuel vapor generated in the fuel tank to the intake pipe side. It is possible to prevent the fuel tank from being damaged due to the generation of pressure, and at the same time, it is possible to appropriately prevent the fuel vapor passing through the body from passing through the diaphragm and entering the cover. It is possible to prevent the release of fuel vapor.
【図１】この考案に係るチエック弁の一例の断面図。FIG. 1 is a sectional view of an example of a check valve according to the present invention.
【図２】この考案に用いられるダイヤフラムの断面図。FIG. 2 is a sectional view of a diaphragm used in the present invention.
【図３】他の実施例の断面図。FIG. 3 is a cross-sectional view of another embodiment.
【図４】燃料蒸気処理装置の組織的な説明図。FIG. 4 is a systematic explanatory view of a fuel vapor processing apparatus.
【図５】先に出願したチエック弁の断面図。FIG. 5 is a cross-sectional view of the previously applied check valve.
１１ ボデー １１ａ 第１パイプ
１１ｂ 第２パイプ １１ｃ 筒柱 １２ 台部
１２ａ 横通孔 １２ｂ 小孔 １３ 傘形の弁体
１４ ダイヤフラム １４ａ 弁部 １５ カバー
１５ａ 第３パイプ １５ｃ 下向き突条 １６ リテーナ
１７ コイルばね １８ 合成樹脂フイルム Ｌ1 ベンチレーション通路11 body 11a 1st pipe
11b 2nd pipe 11c Cylindrical column 12 stand part
12a Horizontal through hole 12b Small hole 13 Umbrella type valve body
14 Diaphragm 14a Valve part 15 Cover
15a Third pipe 15c Downward projection 16 Retainer
17 Coil Spring 18 Synthetic Resin Film L1 Ventilation Passage
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2056493UJPH0673362U (en) | 1993-03-30 | 1993-03-30 | Check valve for fuel vapor treatment equipment |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2056493UJPH0673362U (en) | 1993-03-30 | 1993-03-30 | Check valve for fuel vapor treatment equipment |
| Publication Number | Publication Date |
|---|---|
| JPH0673362Utrue JPH0673362U (en) | 1994-10-18 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2056493UPendingJPH0673362U (en) | 1993-03-30 | 1993-03-30 | Check valve for fuel vapor treatment equipment |
| Country | Link |
|---|---|
| JP (1) | JPH0673362U (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004183663A (en)* | 2002-12-03 | 2004-07-02 | Eaton Corp | Vacuum operated shut-off valve, and device and method for fuel vapor vent control |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004183663A (en)* | 2002-12-03 | 2004-07-02 | Eaton Corp | Vacuum operated shut-off valve, and device and method for fuel vapor vent control |
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