JPS5924858Y2 - Fuel vapor release suppression device for internal combustion engines - Google Patents
Fuel vapor release suppression device for internal combustion enginesInfo
- Publication number
- JPS5924858Y2 JPS5924858Y2 JP2980779U JP2980779U JPS5924858Y2 JP S5924858 Y2 JPS5924858 Y2 JP S5924858Y2 JP 2980779 U JP2980779 U JP 2980779U JP 2980779 U JP2980779 U JP 2980779U JP S5924858 Y2 JPS5924858 Y2 JP S5924858Y2
- Authority
- JP
- Japan
- Prior art keywords
- negative pressure
- valve
- internal combustion
- check valve
- air
- 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
Links
Landscapes
- Control Of The Air-Fuel Ratio Of Carburetors (AREA)
Description
【考案の詳細な説明】
本考案は、内燃機関において、その機関の運転停止後、
気化器や吸気管から発生する蒸発燃料が大気へ放出され
るのを抑止する燃料蒸気放出抑止装置に関するものであ
る。[Detailed description of the invention] The invention provides an internal combustion engine that, after the engine has stopped operating,
The present invention relates to a fuel vapor release suppression device that prevents vaporized fuel generated from a carburetor or an intake pipe from being released into the atmosphere.
そして、その目的とするところは吸入エアクリーナの空
気導入管を負圧モータに連結した開閉弁で開閉するよう
にし、機関運転中は、機関の吸気管に発生する負圧によ
って負圧モータを作動させて開閉弁を開いて機関に必要
な空気を確保し、機関停止時には吸気管の負圧が大気圧
となって前記開閉弁が閉じて気化器や吸気管がら発生す
る蒸発燃料が空気導入管を経て大気へ放出されるのを抑
止でき、また機関始動時には開閉弁に設けた逆止弁を用
いて始動を容易にし、がっ機関の急加速時に吸気管内の
負圧が大気圧近くになっても負圧モータを作動状態にし
て開閉弁を開いたままにし、従って機関に必要な吸入空
気量を充分供給できるとともに蒸発燃料の大気への放出
を抑止できる燃料蒸気放出装置を提供しようとするもの
である。The purpose of this is to open and close the air inlet pipe of the intake air cleaner with a shut-off valve connected to a negative pressure motor, and when the engine is running, the negative pressure motor is operated by the negative pressure generated in the engine's intake pipe. When the engine stops, the negative pressure in the intake pipe becomes atmospheric pressure and the on-off valve closes, allowing vaporized fuel generated from the carburetor and intake pipe to flow through the air introduction pipe. In addition, when starting the engine, a check valve installed in the on-off valve is used to facilitate engine startup, and when the engine suddenly accelerates, the negative pressure in the intake pipe becomes close to atmospheric pressure. Another object of the present invention is to provide a fuel vapor release device that can keep a negative pressure motor in operation and keep an on-off valve open, thereby supplying a sufficient amount of intake air necessary for an engine and suppressing the release of evaporated fuel into the atmosphere. It is.
以下本考案を図に示す実施例により説明する。The present invention will be explained below with reference to embodiments shown in the drawings.
第1図〜第4図において、1は気化器で、その一端側は
吸気管2を介して機関Eに連結され、他端はろ過体3を
有した吸入エアクリーナ4に連結されている。1 to 4, reference numeral 1 denotes a carburetor, one end of which is connected to an engine E via an intake pipe 2, and the other end connected to an intake air cleaner 4 having a filter 3.
5は吸入エアクリーナ4の空気導入管である。5 is an air introduction pipe of the intake air cleaner 4.
6は負圧モータで、吸入エアクリーナ4の空気導入管5
にブラケット(図示しない)を介してビス締め固定しで
ある。6 is a negative pressure motor, which is connected to the air introduction pipe 5 of the intake air cleaner 4.
It is fixed with screws via a bracket (not shown).
この負圧モータ6は、ハウジング6a、6bでゴム製ダ
イヤフラム6bを挾持して巻締め固定することで主要外
観を構成しており、その内部には、ダイヤフラム6bと
ハウジング6aとで形成した負圧室6e、およびダイヤ
フラム6bとハウジング6dとで形成した大気室6fを
有している。The main appearance of this negative pressure motor 6 is formed by sandwiching and tightening a rubber diaphragm 6b between housings 6a and 6b. It has a chamber 6e and an atmospheric chamber 6f formed by a diaphragm 6b and a housing 6d.
また、ダイヤフラム6bの両面には金属プレート(図示
しない)が装着してあり、その金属プレートにロッド7
gが固定しである。Further, metal plates (not shown) are attached to both sides of the diaphragm 6b, and the rod 7 is attached to the metal plate.
g is fixed.
なお、負圧室6eにはコイルスプリング6Cが介装しで
ある。Note that a coil spring 6C is interposed in the negative pressure chamber 6e.
7は逆止弁で、この逆止弁7は負圧モータ6の負圧管6
hと吸気管2とを結ぶゴムホース8,9の途中に取付け
である。7 is a check valve, and this check valve 7 is connected to the negative pressure pipe 6 of the negative pressure motor 6.
It is installed in the middle of the rubber hoses 8 and 9 that connect the air intake pipe 2 and the intake pipe 2.
この逆止弁7の構造は第2図のごとくになっており、導
管7 a 、7 bを有した円板状の樹脂キャップ7C
,7dと、断面H字状の樹脂円筒胴部7eとで主要外観
を構成していてキャップ7 C,7dおよび胴部7eは
接着剤あるいは回転摩擦接合法により固定しである。The structure of this check valve 7 is as shown in FIG. 2, and includes a disc-shaped resin cap 7C having conduits 7a and 7b
, 7d and a resin cylindrical body 7e having an H-shaped cross section constitute the main external appearance, and the caps 7C, 7d and the body 7e are fixed by adhesive or rotational friction bonding.
この逆止弁7の胴部7eの支え部7fには、その1個の
弁ロアgを開閉するゴム製のカサ形状弁体7hが取付け
である。A rubber umbrella-shaped valve body 7h for opening and closing one valve lower g is attached to the support portion 7f of the body 7e of the check valve 7.
なお、逆止弁7の胴部7eの支え部7fを境にA室7i
、B室7jが形威しである。Note that the A chamber 7i is separated from the support portion 7f of the body portion 7e of the check valve 7.
, Room B 7j is a formal example.
この逆止弁7の弁体7hは吸気管2内の負圧がある大き
さになった時にのみ開弁じて弁ロアgを開くもので、従
ってその導管7bはゴムホース9側に、導管7aはゴム
ホース8側に接続しである。The valve body 7h of the check valve 7 opens to open the valve lower g only when the negative pressure in the intake pipe 2 reaches a certain level.Therefore, the conduit 7b is connected to the rubber hose 9 side, and the conduit 7a is It is connected to the rubber hose 8 side.
10は金属製の四角形板状の開閉弁で、この開閉弁10
は吸入エアクリーナ4の空気導入管5の導入口5a内に
配置しである。10 is a metal rectangular plate-shaped on-off valve, and this on-off valve 10
is disposed within the inlet 5a of the air inlet pipe 5 of the suction air cleaner 4.
この開閉弁10の軸受10 aは空気導入管5内壁に溶
接固定した軸受(図示しない)に回転自在に連結してあ
り、また溶接固定したブラケツ)10dの軸受10 b
は負圧モータ6のロッド6gの軸受(図示しない)に回
動自在に連結しである。The bearing 10a of this on-off valve 10 is rotatably connected to a bearing (not shown) fixed by welding to the inner wall of the air introduction pipe 5, and the bearing 10b of the bracket 10d fixed by welding
is rotatably connected to a bearing (not shown) of the rod 6g of the negative pressure motor 6.
11はゴム製のカサ形状の逆止弁で、この逆止弁11は
開閉弁10の先端に設けた4つの弁口10 Cを開閉す
るよう開閉弁10に取付けである。Reference numeral 11 denotes a rubber umbrella-shaped check valve, and this check valve 11 is attached to the on-off valve 10 so as to open and close four valve ports 10C provided at the tip of the on-off valve 10.
この逆止弁11は空気導入管5から吸入エアクリーナ4
のろ週休3側にのみ空気を流すよう開弁じ、逆方向への
流れに対しては閉弁するようになっている。This check valve 11 connects the air intake pipe 5 to the intake air cleaner 4.
The valve is opened to allow air to flow only to the Noro Weekly Day 3 side, and closed to allow air to flow in the opposite direction.
上記構成において、機関Eの始動前においては負圧モー
タ6の負圧室6eに負圧が導入されず、従ってロッド6
gは作動せず開閉弁10は空気導入管5内を閉じている
。In the above configuration, before the engine E is started, negative pressure is not introduced into the negative pressure chamber 6e of the negative pressure motor 6, so that the rod 6
g does not operate, and the on-off valve 10 closes the inside of the air introduction pipe 5.
かかる状態で機関Eを始動させると、わずかに生じる吸
気管2内の負圧が開閉弁10の逆止弁11に作用し、こ
れが開弁じて弁口10 Cを開く。When the engine E is started in such a state, a slight negative pressure in the intake pipe 2 acts on the check valve 11 of the on-off valve 10, which opens the valve port 10C.
これにより、汚染空気は開閉弁10の弁口10 Cを経
てろ週休3に流れ、ここで清浄にされて機関Eに供給さ
れる。As a result, the contaminated air flows through the valve port 10C of the on-off valve 10, where it is purified and supplied to the engine E.
故に、開閉弁10が閉弁していても機関Eの始動が困難
になることはない。Therefore, even if the on-off valve 10 is closed, it will not be difficult to start the engine E.
機関Eの始動後は吸気管2内に発生する大きな負圧によ
り逆止弁7の弁体7hが開弁して弁ロアgを開き、負圧
モータ6の負圧室6eに負圧が導入される。After the engine E is started, the large negative pressure generated in the intake pipe 2 causes the valve body 7h of the check valve 7 to open, opening the valve lower g, and introducing negative pressure into the negative pressure chamber 6e of the negative pressure motor 6. be done.
これにより、スプリング6Cの荷重に抗してダイヤフラ
ム6bが伸長されロッド6gを介して開閉弁10が引き
上げられ、この開閉弁10が開弁じ、空気導入管5が開
かれる。As a result, the diaphragm 6b is extended against the load of the spring 6C, and the on-off valve 10 is pulled up via the rod 6g, and the on-off valve 10 is opened and the air introduction pipe 5 is opened.
従って機関Eに必要な空気を供給できる。Therefore, the air necessary for engine E can be supplied.
一方、機関Eが急加速等を行なった場合には、吸気管2
内の負圧が大気圧程度に低くなるが、それまでに負圧モ
ータ6の負圧室6eに導入されていた負圧により逆止弁
7のA室71の負圧は室B7jより大きいため、その弁
体7hは弁ロアgを閉じる。On the other hand, when engine E performs sudden acceleration, etc., the intake pipe 2
The negative pressure inside the check valve 7 becomes as low as atmospheric pressure, but due to the negative pressure introduced into the negative pressure chamber 6e of the negative pressure motor 6, the negative pressure in the A chamber 71 of the check valve 7 is greater than that in the chamber B7j. , the valve body 7h closes the valve lower g.
故に、負圧モータ6の負圧室6e内には負圧が保持され
るので、開閉弁10は開弁状態を維持し、機関Eに必要
な空気の供給を妨げるものではない。Therefore, since negative pressure is maintained in the negative pressure chamber 6e of the negative pressure motor 6, the on-off valve 10 maintains an open state and does not prevent the supply of air necessary for the engine E.
また、機関Eの停止時には負圧モータ6の負圧室6e内
に負圧が導入されなくなるため、スプリング6Cの荷重
によりダイヤフラム6bは押し縮められるのでロッド6
gを介して開閉弁10が吸入エアクリーナ4の空気導入
管5を閉じる。Furthermore, when the engine E is stopped, no negative pressure is introduced into the negative pressure chamber 6e of the negative pressure motor 6, so the diaphragm 6b is compressed by the load of the spring 6C, so the rod 6
An on-off valve 10 closes the air introduction pipe 5 of the intake air cleaner 4 via g.
この結果、気化器1および吸気管2から発生する燃料蒸
気が吸入エアクリーナ4の空気導入管5を経て大気へ放
出されることはない。As a result, fuel vapor generated from the carburetor 1 and the intake pipe 2 is not released into the atmosphere through the air introduction pipe 5 of the intake air cleaner 4.
第5図は吸入エアクリーナ4の空気導入管5を丁字形状
にして下方の導入口5aから汚染空気を導入するように
した第1図実施例の変形例である。FIG. 5 shows a modification of the embodiment shown in FIG. 1 in which the air introduction pipe 5 of the intake air cleaner 4 is shaped like a T-shape so that contaminated air is introduced from the lower introduction port 5a.
第6図は開閉弁10の逆止弁11をゴム製の平板形状と
し、これをリベット12で取付けた本考案の他の実施例
を示すものである。FIG. 6 shows another embodiment of the present invention in which the check valve 11 of the on-off valve 10 is made of rubber and has a flat plate shape and is attached with rivets 12.
第7図は逆止弁11を開閉弁11の先端にリベット12
で取付けるとともに、開閉弁11の閉弁時に逆止弁11
の先端が第1図の吸入エアクリーナ4の空気導入管5の
内壁に接触するようにした本考案の更に他の実施例を示
すものである。Figure 7 shows a rivet 12 at the tip of the check valve 11.
At the same time, when the on-off valve 11 is closed, the check valve 11
This figure shows still another embodiment of the present invention in which the tip of the air inlet tube 5 contacts the inner wall of the air introduction pipe 5 of the intake air cleaner 4 shown in FIG.
この実施例によれば、逆止弁11の開弁時では空気導入
管5の内壁と開閉弁11の先端との間の矩形状隙間を経
て汚染空気が流れる。According to this embodiment, when the check valve 11 is open, contaminated air flows through the rectangular gap between the inner wall of the air introduction pipe 5 and the tip of the on-off valve 11.
なお、本考案において、負圧モータ6はダイヤフラム式
に限らず、ベローズ式でもよい。In the present invention, the negative pressure motor 6 is not limited to a diaphragm type, but may be a bellows type.
また、逆止弁としてはスプリングと金属弁体とで構成し
たものでもよい。Further, the check valve may be constructed of a spring and a metal valve body.
更に、開閉弁10は吸入エアクリーナ4の空気導入管5
内に設置したが、その外部であっても勿論よい。Further, the on-off valve 10 is connected to the air introduction pipe 5 of the intake air cleaner 4.
Although it was installed inside, it may of course be installed outside.
以上述べたごとく、本考案においては、内燃機関への吸
入空気を清浄にするろ週休を有した吸入エアクリーナと
、負圧室への負圧の導入遮断により伸縮される膜部材を
介し作動させられるロッドを有した負圧モータと、この
負圧モータの負圧室と内燃機関の吸気管とを結ぶ負圧経
路に設けられ、吸気管内の負圧が大なる時にのみ開弁す
る逆止弁と、負圧モータのロッドに回動可能に連結され
、吸入エアクリーナの空気導入管の導入口内を開閉する
開閉弁と、この開閉弁に設けられ、吸入エアクリーナの
空気導入管からろ週休側にのみ空気を流し逆方向への空
気の流れを遮断する逆止弁とを備えたから、機関運転後
、その運転を停止すると吸気管の負圧が負圧モータに作
用しなくなって、開閉弁が空気導入管の導入口を閉じる
ため、吸入エアクリーナが連結される気化器、吸気管か
ら発生した燃料蒸気は空気導入管を経て大気に放出され
ることはなく、故に大気汚染を防止できる。As mentioned above, in the present invention, the air cleaner is operated via an intake air cleaner that cleans the intake air to the internal combustion engine, and a membrane member that expands and contracts by cutting off the introduction of negative pressure to the negative pressure chamber. A negative pressure motor having a rod, and a check valve that is installed in the negative pressure path connecting the negative pressure chamber of the negative pressure motor and the intake pipe of the internal combustion engine and opens only when the negative pressure in the intake pipe becomes large. , an on-off valve that is rotatably connected to the rod of the negative pressure motor and opens and closes the inlet of the air inlet pipe of the suction air cleaner; Since the engine is equipped with a check valve that shuts off the flow of air in the opposite direction, when the engine is stopped after operation, the negative pressure in the intake pipe no longer acts on the negative pressure motor, and the on-off valve closes the air intake pipe. Since the intake port is closed, the fuel vapor generated from the carburetor and the intake pipe to which the intake air cleaner is connected will not be released into the atmosphere through the air introduction pipe, thereby preventing air pollution.
また、内燃機関始動時においては、開閉弁が吸入エアク
リーナの空気導入管の導入口を閉じていても、この開閉
弁に設けた逆止弁が開くので、内燃機関に必要な吸入空
気を内燃機関へ供給でき、従って機関の始動が困難にな
ることはない。In addition, when starting the internal combustion engine, even if the on-off valve closes the inlet of the air intake pipe of the intake air cleaner, the check valve installed in this on-off valve opens, so that the intake air necessary for the internal combustion engine is supplied to the internal combustion engine. Therefore, starting the engine will not be difficult.
また、内燃機関の運転時は吸気管内の大きい負圧が負圧
モータに作用して開閉弁が開くため、内燃機関へは必要
吸入空気が確保され、かかる状態で内燃機関の運転に負
荷がかかつて吸気管内の負圧が急激して大気圧近くにな
っても負圧モータと吸気管との間の逆止弁が閉弁して負
圧モータの高負圧時の状態を維持するため、開閉弁は開
弁じたままになり、内燃機関への吸入空気の供給が妨げ
られることはなく、内燃機関の不調を解消できる。In addition, when the internal combustion engine is operating, the large negative pressure in the intake pipe acts on the negative pressure motor and opens the on-off valve, so the necessary intake air is secured to the internal combustion engine, and under such conditions, there is no load on the internal combustion engine. In the past, even if the negative pressure in the intake pipe suddenly rose to near atmospheric pressure, the check valve between the negative pressure motor and the intake pipe would close and maintain the high negative pressure state of the negative pressure motor. The on-off valve remains open, and the supply of intake air to the internal combustion engine is not obstructed, making it possible to eliminate malfunctions in the internal combustion engine.
このように、本考案はあらゆる内燃機関の運転域でも内
燃機関に対する吸入空気を確保できるとともに、燃料蒸
気の大気への放出を抑止できる。In this way, the present invention can ensure intake air for the internal combustion engine in all operating ranges of the internal combustion engine, and can also prevent fuel vapor from being released into the atmosphere.
第1図は本考案装置の一実施例を示す模式的断面図、第
2図は第1図の逆止弁7の詳細構造を示す断面図、第3
図は第1図の開閉弁10と逆止弁11との取付関係を詳
細に示す断面図、第4図は第3図の平面図、第5図は第
1図の変形例を示す要部模式的断面図、第6図および第
7図は本考案装置の他の実施例を示す断面図である。
1・・・・・・気化器、2・・・・・・吸入管、3・・
・・・・ろ週休、4・・・・・・吸入エアクリーナ、5
・・・・・・空気導入管、5a・・・・・・導入口、6
・・・・・・負圧モータ、6b・・・・・・膜部材をな
すダイヤフラム、6e・・・・・・負圧室、6g・・・
・・・ロッド、7・・・・・・逆止弁、10・・・・・
・開閉弁、11・・・・・・逆止弁、E・・・・・・内
燃機関。FIG. 1 is a schematic sectional view showing an embodiment of the device of the present invention, FIG. 2 is a sectional view showing the detailed structure of the check valve 7 shown in FIG. 1, and FIG.
The figure is a sectional view showing in detail the mounting relationship between the on-off valve 10 and the check valve 11 in Fig. 1, Fig. 4 is a plan view of Fig. 3, and Fig. 5 is a main part showing a modification of Fig. 1. The schematic cross-sectional views, FIGS. 6 and 7, are cross-sectional views showing other embodiments of the device of the present invention. 1... vaporizer, 2... suction pipe, 3...
...Ro week off, 4...Suction air cleaner, 5
...Air introduction pipe, 5a...Inlet port, 6
...Negative pressure motor, 6b...Diaphragm forming a membrane member, 6e...Negative pressure chamber, 6g...
...Rod, 7...Check valve, 10...
- Opening/closing valve, 11... Check valve, E... Internal combustion engine.
Claims (1)
エアクリーナと、負圧室への負圧の導入遮断により伸縮
される膜部材を介し作動させられるロッドを有した負圧
モータと、この負圧モータの負圧室と前記内燃機関の吸
気管とを結ぶ負圧経路に設けられ、前記吸気管内の負圧
が大なる時にのみ開弁する逆止弁と、前記負圧モータの
ロッドに回動可能に連結され、前記吸入エアクリーナの
空気導入管の導入口を開閉する開閉弁と、この開閉弁に
設けられ、前記吸入エアクリーナの空気導入管から前記
ろ週休側にのみ空気を流し逆方向への空気の流れを遮断
する逆止弁とを備えたことを特徴とする内燃機関の燃料
蒸気放出抑止装置。An intake air cleaner having a filter that cleans intake air to an internal combustion engine; a negative pressure motor having a rod that is operated via a membrane member that expands and contracts by cutting off the introduction of negative pressure to a negative pressure chamber; A check valve is provided in a negative pressure path connecting the negative pressure chamber of the negative pressure motor and the intake pipe of the internal combustion engine and opens only when the negative pressure in the intake pipe becomes large, and a check valve is provided on the rod of the negative pressure motor. An on-off valve that is rotatably connected and opens and closes the inlet of the air introduction pipe of the intake air cleaner; and an on-off valve that is provided on the on-off valve to allow air to flow from the air introduction pipe of the intake air cleaner only to the filter side in the opposite direction. 1. A fuel vapor release suppression device for an internal combustion engine, comprising a check valve that blocks air flow to the internal combustion engine.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2980779U JPS5924858Y2 (en) | 1979-03-08 | 1979-03-08 | Fuel vapor release suppression device for internal combustion engines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2980779U JPS5924858Y2 (en) | 1979-03-08 | 1979-03-08 | Fuel vapor release suppression device for internal combustion engines |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55130052U JPS55130052U (en) | 1980-09-13 |
JPS5924858Y2 true JPS5924858Y2 (en) | 1984-07-23 |
Family
ID=28878270
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2980779U Expired JPS5924858Y2 (en) | 1979-03-08 | 1979-03-08 | Fuel vapor release suppression device for internal combustion engines |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5924858Y2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5997810B1 (en) * | 2015-06-30 | 2016-09-28 | 本田技研工業株式会社 | Engine intake structure |
-
1979
- 1979-03-08 JP JP2980779U patent/JPS5924858Y2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS55130052U (en) | 1980-09-13 |
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