JPH0137169Y2 - - Google Patents
Info
- Publication number
- JPH0137169Y2 JPH0137169Y2 JP17524484U JP17524484U JPH0137169Y2 JP H0137169 Y2 JPH0137169 Y2 JP H0137169Y2 JP 17524484 U JP17524484 U JP 17524484U JP 17524484 U JP17524484 U JP 17524484U JP H0137169 Y2 JPH0137169 Y2 JP H0137169Y2
- Authority
- JP
- Japan
- Prior art keywords
- orifice
- negative pressure
- scavenging
- control valve
- mixture control
- 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
- 230000002000 scavenging effect Effects 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Control Of The Air-Fuel Ratio Of Carburetors (AREA)
Description
【考案の詳細な説明】
技術分野
本考案は、気化器の混合気制御弁のオリフイス
に関するものである。[Detailed Description of the Invention] Technical Field The present invention relates to an orifice of a mixture control valve of a carburetor.
従来技術
機関では、減速の瞬間、吸入空気はカツトされ
るが燃料は慣性力によるマニホールド内付着分が
瞬時に気化して機関内に吸入されるため、混合気
のＡ／Ｆが濃くなり排気ガス中のHCが増大する
という問題があつた。そこで、気化器において
は、混合気制御弁により減速の瞬間に一定時空気
をバイパスさせてＡ／Ｆの補正を行うようにした
ものがある。Conventional technology In an engine, the intake air is cut off at the moment of deceleration, but the fuel adhering to the manifold due to inertia instantly vaporizes and is sucked into the engine, so the A/F of the air-fuel mixture becomes rich and exhaust gas There was a problem that the HC inside increased. Therefore, some carburetors are configured to correct the A/F by bypassing air for a certain period of time at the moment of deceleration using a mixture control valve.
この種従来の混合気制御弁として、例えば実開
昭52−5129号公報に記載のものは、第２図に示し
た如く、気化器吸気胴１のバイパスとして設けら
れた空気通路２と、マニホールド負圧の変動に応
じて空気通路２を開閉する負圧アクチユエータ３
とから基本的に構成され、下記の如く作動するよ
うになつていた。即ち、第３図に示した如く、機
関減速時スロツトル弁４が閉じるとマニホールド
負圧が急増し、負圧アクチユエータ２の第一負圧
室５が同負圧となると共にチエツク弁６も閉じ、
この時第二負圧室７が定常走行時負圧のままであ
るため両負圧室５，７間に圧力差が生じ、該圧力
差がスプリング８の弾力よりも大となり、ダイア
フラム９が第２図右方へ変位して空気通路弁１０
を開く。そして、両負圧室５，７間にはオリフイ
ス１１が設けられているため第二負圧室７の空気
が第一負圧室５へ徐々にリークし、最終的に両負
圧室５，７間の圧力差がスプリング８の弾力より
も小となり、ダイアフラム９が第２図左方へ戻つ
て空気通路弁１０を閉じる。尚、この間の空気通
路弁１０の開閉時間は第二負圧室７の容積及びオ
リフイス１１の絞り径によつて決定される。又、
チエツク弁６は減速から定常走行に移る時に開い
て第二負圧室２を定常負圧にすべく作動する。 As a conventional mixture control valve of this kind, for example, the one described in Japanese Utility Model Application Publication No. 52-5129, as shown in FIG. A negative pressure actuator 3 that opens and closes the air passage 2 according to fluctuations in negative pressure.
It basically consisted of the following, and operated as follows. That is, as shown in FIG. 3, when the throttle valve 4 closes during engine deceleration, the manifold negative pressure rapidly increases, the first negative pressure chamber 5 of the negative pressure actuator 2 reaches the same negative pressure, and the check valve 6 also closes.
At this time, since the second negative pressure chamber 7 remains under negative pressure during steady running, a pressure difference occurs between the two negative pressure chambers 5 and 7, and this pressure difference becomes larger than the elasticity of the spring 8, and the diaphragm 9 2 Displaced to the right to remove the air passage valve 10
open. Since an orifice 11 is provided between the two negative pressure chambers 5 and 7, the air in the second negative pressure chamber 7 gradually leaks to the first negative pressure chamber 5, and finally the two negative pressure chambers 5, The pressure difference between 7 and 7 becomes smaller than the elasticity of spring 8, and diaphragm 9 returns to the left in FIG. 2 to close air passage valve 10. The opening/closing time of the air passage valve 10 during this period is determined by the volume of the second negative pressure chamber 7 and the diameter of the orifice 11. or,
The check valve 6 opens when the vehicle shifts from deceleration to steady running and operates to bring the second negative pressure chamber 2 to steady negative pressure.
ところが、上記オリフイス１１は第４図に示し
た如く単にオリフイス部１１ａのみを備えている
ため、吸入空気に排気ガスの一部が含まれている
場合はオリフイス部１１ａの出口にカーボン等の
堆積物が生じて目詰りを起こしてしまうという問
題があつた。そこで、これを防ぐために、例えば
第５図に示した如くオリフイス部１１ａの出口の
近傍に掃気ノズル１２を設け、該出口に掃気流を
衝突させて堆積物を生じないようにする方法が考
えられたが、この方法の場合、オリフイス１１の
組付けに際しオリフイス部１１ａの出口に対する
掃気ノズル１２の掃気流噴出位置精度を向上させ
ることが難しく、而もオリフイス１１と掃気ノズ
ル１２の両方の加工、組付けを必要とするため製
造コストが高くなるという問題があつた。 However, since the orifice 11 is simply provided with an orifice portion 11a as shown in FIG. 4, if part of the exhaust gas is included in the intake air, deposits such as carbon may be deposited at the outlet of the orifice portion 11a. There was a problem that this caused clogging. Therefore, in order to prevent this, a method has been considered in which a scavenging air nozzle 12 is provided near the outlet of the orifice portion 11a as shown in FIG. However, in this method, when assembling the orifice 11, it is difficult to improve the accuracy of the scavenging air jetting position of the scavenging nozzle 12 with respect to the outlet of the orifice portion 11a, and it is difficult to process and assemble both the orifice 11 and the scavenging nozzle 12. There was a problem in that the manufacturing cost was high because it required attachment.
目 的
本考案は、上記問題点に鑑み、掃気流噴出位置
精度が向上し且つ製造コストも安い混合気制御弁
のオリフイスを提供せんとするものである。Purpose In view of the above-mentioned problems, the present invention aims to provide an orifice for a mixture control valve that improves the accuracy of the scavenging air jet position and is inexpensive to manufacture.
概 要
本考案による混合気制御弁のオリフイスは、オ
リフイス部と、掃気流噴射口が該オリフイス部の
出口に近接する掃気ノズル部とが同一ボデイに形
成されて成ることにより、オリフイス部と掃気ノ
ズル部とが予め正確な位置関係のまま形成される
と共に、オリフイスだけの加工、組付で済むよう
にしたものである。Overview The orifice of the mixture control valve according to the present invention has the orifice part and the scavenging nozzle part in which the scavenging air jet port is close to the outlet of the orifice part formed in the same body. The parts are formed in advance in an accurate positional relationship, and only the orifice needs to be processed and assembled.
実施例
以下、第１図に示した一実施例に基づき本考案
を詳細に説明すれば、１３は、オリフイス部１３
ａと、掃気流噴射口１３b′が該オリフイス部１３
ａの出口１３a′と近接する掃気ノズル部１３ｂと
が同一ボデイに形成されて成るオリフイスであ
る。尚、オリフイス部１３ａの径は非常に小さい
ものであつて、0.4mm以下である。Embodiment Hereinafter, the present invention will be explained in detail based on an embodiment shown in FIG.
a and the scavenging air jet port 13b' are connected to the orifice portion 13.
This is an orifice in which an outlet 13a' of a and an adjacent scavenging nozzle portion 13b are formed in the same body. Note that the diameter of the orifice portion 13a is very small, 0.4 mm or less.
本考案による混合気制御弁のオリフイスは上述
の如く構成されているから、オリフイス部１３ａ
と掃気ノズル部１３ｂとは予め正確な位置関係の
まま形成され、その結果オリフイス部１３ａの出
口に対する掃気ノズル１３ｂの掃気流噴出位置精
度が向上する。又、従来例と異なり、オリフイス
１３だけの加工、組付で済むので製造コストも安
い。 Since the orifice of the mixture control valve according to the present invention is constructed as described above, the orifice portion 13a
The scavenging nozzle portion 13b and the scavenging nozzle portion 13b are formed in advance in an accurate positional relationship, and as a result, the scavenging air jetting position accuracy of the scavenging nozzle 13b with respect to the outlet of the orifice portion 13a is improved. Further, unlike the conventional example, manufacturing costs are low because only the orifice 13 needs to be processed and assembled.
考案の効果
上述の如く、本考案による混合気制御弁のオリ
フイスは、掃気流噴出位置精度が向上し且つ製造
コストも安いという実用上重要な利点を有してい
る。Effects of the Invention As described above, the orifice of the mixture control valve according to the present invention has important practical advantages of improved scavenging jet position accuracy and low manufacturing cost.
第１図は本考案による混合気制御弁のオリフイ
スの一実施例の断面図、第２図は従来の混合気制
御弁の断面図、第３図は上記混合気制御弁の作動
原理を示すタイムチヤート、第４図は上記混合気
制御弁のオリフイスの断面図、第５図は他のオリ
フイスの断面図である。
１……気化器吸気胴、２……空気通路、３……
混合気制御弁、４……スロツトル弁、５……第一
負圧室、６……チエツク弁、７……第二負圧室、
８……ダイアフラム、９……スプリング、１０…
…空気通路弁、１３……オリフイス、１３ａ……
オリフイス部、１３ｂ……掃気ノズル部。
Figure 1 is a sectional view of an embodiment of the orifice of the mixture control valve according to the present invention, Figure 2 is a sectional view of a conventional mixture control valve, and Figure 3 is a timing diagram showing the operating principle of the mixture control valve. 4 is a sectional view of the orifice of the air-fuel mixture control valve, and FIG. 5 is a sectional view of another orifice. 1... Carburetor intake shell, 2... Air passage, 3...
Mixture control valve, 4... Throttle valve, 5... First negative pressure chamber, 6... Check valve, 7... Second negative pressure chamber,
8...Diaphragm, 9...Spring, 10...
...Air passage valve, 13...Orifice, 13a...
Orifice part, 13b...Scavenging nozzle part.
Claims (1)
にして成る混合気制御弁のオリフイスにおいて、
オリフイス部と、掃気流噴射口が該オリフイス部
の出口に近接する掃気ノズル部とが同一ボデイに
形成されていることを特徴とするオリフイス。 In the orifice of the mixture control valve configured to cause scavenging air to collide with the outlet of the orifice,
An orifice characterized in that an orifice portion and a scavenging nozzle portion in which a scavenging air jet port is close to an outlet of the orifice portion are formed in the same body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17524484U JPH0137169Y2 (en) | 1984-11-19 | 1984-11-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17524484U JPH0137169Y2 (en) | 1984-11-19 | 1984-11-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6191059U JPS6191059U (en) | 1986-06-13 |
| JPH0137169Y2 true JPH0137169Y2 (en) | 1989-11-09 |
Family
ID=30732849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17524484U Expired JPH0137169Y2 (en) | 1984-11-19 | 1984-11-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0137169Y2 (en) |
-
1984
- 1984-11-19 JP JP17524484U patent/JPH0137169Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6191059U (en) | 1986-06-13 |
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