JPS6038530B2 - Secondary air supply device in exhaust gas purification device of internal combustion engine - Google Patents
Secondary air supply device in exhaust gas purification device of internal combustion engineInfo
- Publication number
- JPS6038530B2 JPS6038530B2 JP215978A JP215978A JPS6038530B2 JP S6038530 B2 JPS6038530 B2 JP S6038530B2 JP 215978 A JP215978 A JP 215978A JP 215978 A JP215978 A JP 215978A JP S6038530 B2 JPS6038530 B2 JP S6038530B2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- secondary air
- exhaust
- air supply
- 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.)
- Expired
Links
Landscapes
- Exhaust Gas After Treatment (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、排気ガス中の夫燃成分を排気系において酸化
処理するための、２次空気供給装置に関するものである
。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a secondary air supply device for oxidizing secondary combustion components in exhaust gas in an exhaust system.
排気通路における排気圧力の脈動を利用して外気をチェ
ックバルブを介して導入し、排気ボートへ２次空気を供
給し、排気通路の途中でＩＪァクタ等により排気ガス中
の未燃成分を酸化処理する排気ガス浄化装置がある。Utilizing the pulsation of exhaust pressure in the exhaust passage, outside air is introduced through the check valve to supply secondary air to the exhaust boat, and in the middle of the exhaust passage, unburned components in the exhaust gas are oxidized by an IJ factor, etc. There is an exhaust gas purification device that does this.
このような装置では、エンジンの高負荷、高回転では脈
動による負圧が発生しなくなり、排気ガスがチェックバ
ルブの所まで逆流するようになる。In such a device, when the engine is under high load and speed, negative pressure due to pulsation is no longer generated, and exhaust gas flows back to the check valve.
ところで、チェックバルブは排気圧力の脈動に追従でき
るように薄い金属板で作られており、これが高温の排気
ガスに晒されると腐蝕し、短期間で使用に耐えなくなる
。もっとも実開昭５０−１４７０１７号公報あるいは実
開昭５０−１５６６０計弓公報にみられるような逆流防
止弁を設ければ排気ガスの逆流自体は防止できるが、そ
の配置如何によってはチェックバルブが排気ガスに晒さ
れるのを有効に防止できない。そこで本発明は、逆流し
た排気ガスがチェックバルブへ流れるのを防ぎ、または
少なくして、チェックバルブの熱による耐久性低下を防
止することのできる装置を提供せんとするものである。By the way, the check valve is made of a thin metal plate so that it can follow the pulsation of exhaust pressure, and when exposed to high temperature exhaust gas, it corrodes and becomes unusable in a short period of time. However, backflow of exhaust gas itself can be prevented by installing a check valve as seen in Japanese Utility Model Application No. 50-147017 or No. 50-15660, but depending on its arrangement, the check valve may Exposure to gas cannot be effectively prevented. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a device that can prevent or reduce the flow of backflow exhaust gas to the check valve, thereby preventing the check valve from deteriorating in durability due to heat.
〔問題点を解決するための手段〕この目的に従い、本発
明による装置は、逆流した排気ガスを導入する分枝路を
設け、逆流排気ガスをチェックバルブを通して排気ガス
通路へ逃すように構成されている。[Means for solving the problem] In accordance with this object, the device according to the invention is configured to provide a branch passage for introducing the backflow exhaust gas and to allow the backflow exhaust gas to escape through a check valve into the exhaust gas passage. There is.
以下図面を参照して説明する。 This will be explained below with reference to the drawings.
図において、符号１はシリンダヘッド、２は吸入ボート
、３は排気ボートで、該排気ボート３の排気弁４に近接
した位置において、２次空気供給口５が開□し、シリン
ダヘッドー内の２次空気供給通路６に蓮適している。該
２次空気供給通路６は〈字状に屈曲してシリソダヘッド
外への関口部７に蓮通し、２次空気供給口５の部分より
屈曲部で屈曲せずに直線状に伸びた延長部として分枝路
８が設けられている。前記関口部７より導管９により２
次空気導入用チェックバルブー０１こ蓬通し、更にェア
クリーナ１１を経て外気に運通している。前記分枝路８
は適当な容積を有するように作られ、更に横方向にガス
溜空間１５が設けられている。In the figure, reference numeral 1 is a cylinder head, 2 is an intake boat, and 3 is an exhaust boat.A secondary air supply port 5 is opened at a position close to the exhaust valve 4 of the exhaust boat 3, and the air inside the cylinder head is opened. It is suitable for the secondary air supply passage 6. The secondary air supply passage 6 is bent in the shape of a letter and passes through the entrance 7 to the outside of the cylinder head, and serves as an extension extending straight from the secondary air supply opening 5 without being bent at the bend. A branch 8 is provided. 2 by the conduit 9 from the entrance part 7
The air is then passed through a check valve 01 for introducing air, and further passed through an air cleaner 11 to allow outside air to flow through. Said branch road 8
is made to have an appropriate volume, and is further provided with a gas reservoir space 15 in the lateral direction.
分枝路８の段部に排気ガス逃し用チェックバルブ１２が
設けられ、それより更に導管１３により排気管１４に運
通している。以上のような構成であるから、排気圧力の
脈動の負圧の時、外気がェァクリーナ１１を通り、チェ
ックバルブ１０を通って排気ボート３内に導入され、排
気ガス中の未燃成分の酸化を促進する。An exhaust gas release check valve 12 is provided at the step of the branch 8, and is further connected to an exhaust pipe 14 by a conduit 13. With the above configuration, when the exhaust pressure is pulsating negative, the outside air passes through the air cleaner 11, passes through the check valve 10, and is introduced into the exhaust boat 3, thereby oxidizing the unburned components in the exhaust gas. Facilitate.
高負荷、高回転の時に、排気ガスが逆流すると、そのガ
スは通路６を直進して分枝路８に流入しガス溜空間１５
に溜り、チェックバルブ１０の方へ流れる量は少なくな
る。逆流排気ガスの量が多い時は、チェックバルブ１２
を開いて導管ｉ３に逃げ、更に排気管１４に流入する。
従って２次空気導入用チェックバルブ１０の方へ排気ガ
スが逆流するのを防止することができる。なお逆流した
排気ガスは、排気ガス還流通路へ逃すようにしてもよい
。〔発明の効果〕
以上で明らかなように、本発明１こよれ‘よ、２次空気
供給通路に逆流方向に分枝路を設け、該分枝路に排気ガ
スの逆流により開くチェックバルブを設け、排気ガスを
逃すように構成しているので、エンジンの高負荷、高回
転の時、２次空気供給管を逆流した排気ガスを分枝略を
通して逃すことができ、従って２次空気導入用チェック
バルブの所まで排気ガスが逆流するのを防ぎ、または逆
流する量を少なくし、該チェックバルブの熱による耐久
性低下を防ぐことができる。When exhaust gas flows backwards during high load and high rotation, the gas goes straight through the passage 6 and flows into the branch passage 8, where it flows into the gas reservoir space 15.
The amount that flows toward the check valve 10 decreases. When the amount of backflow exhaust gas is large, check valve 12
It opens and escapes into the conduit i3, and then flows into the exhaust pipe 14.
Therefore, it is possible to prevent exhaust gas from flowing back toward the secondary air introduction check valve 10. Note that the exhaust gas that has flowed back may be allowed to escape to the exhaust gas recirculation passage. [Effects of the Invention] As is clear from the above, the first aspect of the present invention is that a branch passage is provided in the secondary air supply passage in the reverse flow direction, and a check valve that opens due to the reverse flow of exhaust gas is provided in the branch passage. Since the structure is configured to allow exhaust gas to escape, when the engine is under high load and rotation, the exhaust gas that has flowed back through the secondary air supply pipe can be released through the branch, thereby preventing the secondary air introduction check. It is possible to prevent the exhaust gas from flowing back to the valve, or to reduce the amount of backflow, and to prevent the durability of the check valve from decreasing due to heat.
・第１図は本発明の排気実施例を示す正面図、第２図は
シリンダヘッド部分の断面図、第３図は菱部を示す拡大
断面図である。
１・・・・・・シリンダヘツド、２…・・・吸入ボート
、３・・・・・・排気ボート、４…・・・排気弁、５・
・・・・・２次空気供給口、６…・・・２次空気供給通
路、７…・・・開０部、８・・・…分枝路、９・・・・
・・導管、１０・・・・・・２次空気導入用チェックバ
ルブ、１１・・・・・・ェアクリ−ナ、１２・・・・・
・排気ガス逃し用チェックバルブ、１３・・・・・・導
管、１４・・・・・・排気管、１５・・・・・・ガス溜
空間。
第１図
第２図
第３図- Fig. 1 is a front view showing an exhaust embodiment of the present invention, Fig. 2 is a sectional view of the cylinder head portion, and Fig. 3 is an enlarged sectional view showing the diamond part. 1...Cylinder head, 2...Suction boat, 3...Exhaust boat, 4...Exhaust valve, 5...
...Secondary air supply port, 6...Secondary air supply passage, 7...Opening part 0, 8...Branch passage, 9...
... Conduit, 10 ... Check valve for secondary air introduction, 11 ... Air cleaner, 12 ...
- Check valve for exhaust gas relief, 13... Conduit, 14... Exhaust pipe, 15... Gas reservoir space. Figure 1 Figure 2 Figure 3
Claims (1)
バルブを介して２次空気を排気通路へ供給する装置にお
いて、シリンダヘツド内の２次空気供給通路に排気ガス
逆流方向において分枝する所定容積からなる分枝路を設
け、該分枝路の端部をチエツクバルブを介して排気通路
に連通し、２次空気供給通路を逆流する排気ガスをチエ
ツクバルブを介して排気通路へ逃すように構成したこと
を特徴とする内燃機関の排気ガス浄化装置における２次
空気供給装置。1 In a device that supplies secondary air to an exhaust passage through a check valve for introducing secondary air using pulsation of exhaust pressure, a predetermined branch is provided in the secondary air supply passage in the cylinder head in the exhaust gas backflow direction. A branch passage consisting of a volume is provided, and an end of the branch passage is communicated with the exhaust passage through a check valve, so that exhaust gas flowing back through the secondary air supply passage is released to the exhaust passage through the check valve. A secondary air supply device in an exhaust gas purification device for an internal combustion engine, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP215978A JPS6038530B2 (en) | 1978-01-12 | 1978-01-12 | Secondary air supply device in exhaust gas purification device of internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP215978A JPS6038530B2 (en) | 1978-01-12 | 1978-01-12 | Secondary air supply device in exhaust gas purification device of internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5495825A JPS5495825A (en) | 1979-07-28 |
| JPS6038530B2 true JPS6038530B2 (en) | 1985-09-02 |
Family
ID=11521567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP215978A Expired JPS6038530B2 (en) | 1978-01-12 | 1978-01-12 | Secondary air supply device in exhaust gas purification device of internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6038530B2 (en) |
-
1978
- 1978-01-12 JP JP215978A patent/JPS6038530B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5495825A (en) | 1979-07-28 |
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