JPH0134693Y2 - - Google Patents
Info
- Publication number
- JPH0134693Y2 JPH0134693Y2 JP1983193575U JP19357583U JPH0134693Y2 JP H0134693 Y2 JPH0134693 Y2 JP H0134693Y2 JP 1983193575 U JP1983193575 U JP 1983193575U JP 19357583 U JP19357583 U JP 19357583U JP H0134693 Y2 JPH0134693 Y2 JP H0134693Y2
- Authority
- JP
- Japan
- Prior art keywords
- passage
- carburetor
- long
- vaporizer
- prevention plate
- 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
- 230000002265 prevention Effects 0.000 claims description 7
- 239000006200 vaporizer Substances 0.000 claims description 7
- 239000000446 fuel Substances 0.000 description 8
- KEUKAQNPUBYCIC-UHFFFAOYSA-N ethaneperoxoic acid;hydrogen peroxide Chemical compound OO.CC(=O)OO KEUKAQNPUBYCIC-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Landscapes
- Control Of The Air-Fuel Ratio Of Carburetors (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Description
【考案の詳細な説明】
従来の汎用エンジンの気化器の構造を第1図に
ついて説明する。汎用エンジンは多用途に使用さ
れ、作業機によつては第1図に示すようにエアク
リーナ1がアウタエアベント式気化器3から遠く
離れて設置され長蛇管2で結ばれているものがあ
る。気化器3の仕様が一定の場合、長蛇管2を採
用すると、採用しない場合に比べ気化器3の空燃
比特性が薄くなり、エンジン不調を起す。したが
つて長蛇管2を採用しても空燃比特性が適正にな
るよう主ジエツト4、主空気ジエツト5の両者或
は一方を変更して気化器流量調整試験を行つてい
る。その気化器調整試験に多くの時間を要するの
が欠点であつた。6は接手、7はブリーザパイプ
でエンジンのクランクケース(図示せず)と接続
している。[Detailed Description of the Invention] The structure of a conventional carburetor for a general-purpose engine will be explained with reference to FIG. General-purpose engines are used for many purposes, and some work machines have an air cleaner 1 installed far away from an outer air vent type carburetor 3 and connected to it by a long pipe 2, as shown in FIG. If the specifications of the carburetor 3 are constant, if the long tube 2 is used, the air-fuel ratio characteristics of the carburetor 3 will be thinner than when the long tube 2 is not used, causing engine malfunction. Therefore, a carburetor flow rate adjustment test is performed by changing either or both of the main jet 4 and the main air jet 5 so that the air-fuel ratio characteristics are appropriate even if the long meandering pipe 2 is employed. The drawback was that the carburetor adjustment test required a lot of time. 6 is a joint, and 7 is a breather pipe connected to the engine crankcase (not shown).
本考案は上記の欠点を安価な手段でなくすこと
を目的として考案されたものである。 The present invention has been devised for the purpose of eliminating the above-mentioned drawbacks by inexpensive means.
本考案は、エアクリーナが気化器から遠く離れ
て設置され、長蛇管を有する汎用エンジンのアウ
タエアベント式気化器において、気化器上流側
に、(イ)通路断面を絞つた入口通路と、(ロ)通路断面
が前記入口通路より大きい出口通路と、(ハ)この出
口通路内に一様に分布する通気抵抗調整用エレメ
ントと、(ニ)前記出口通路端面に配設された吹き返
し防止板とより構成される接手を設けたことを特
徴とする気化器に係り、開発試験時間が大幅に短
縮される気化器を提供しようとするもので、小型
汎用エンジン全般に応用できるものである。 The present invention provides an outer air vent type carburetor for a general-purpose engine in which the air cleaner is installed far away from the carburetor and has a long pipe. Consisting of an outlet passageway whose cross section is larger than the inlet passageway, (c) an airflow resistance adjusting element uniformly distributed within the outlet passageway, and (d) a blowback prevention plate disposed on the end face of the outlet passageway. The purpose of this invention is to provide a carburetor that is characterized by having a joint that can be used to reduce the development and testing time, and is applicable to all small general-purpose engines.
本考案の気化器の一実施例を第2図について説
明する。第2図は本考案の気化器の一実施例の概
略図を示す。1はエアクリーナ、2は長蛇管、3
は気化器、4は主ジエツト、5は主空気ジエツ
ト、7はブリーザを示し、従来の気化器と同様で
ある。11は例えば円柱状の発泡多孔体から成る
エレメントで通気抵抗調整用である。12は吹き
返し防止板(通常のエアクリーナに使用されてい
るような板に適当な穴を明けたもの)である。1
6は接手でエレメント11の位置決め用に段差が
ついており、また吹き返し防止板12を気化器3
との間に設定すべく位置決め段差がついている。
すなわち接手16にはその上流側に通路断面積を
絞つた入口通路16−1が形成されており、この
後に段差をつけて通路断面積が入口16−1より
大きい出口通路16−2が続く。この出口通路1
6−2内に、一様に分布する発泡多孔体より成る
通気抵抗調整用エレメント11が収容されてい
る。吹き返し防止板12はエレメント11の流出
防止の役も果たしている。 An embodiment of the vaporizer of the present invention will be described with reference to FIG. FIG. 2 shows a schematic diagram of an embodiment of the vaporizer of the present invention. 1 is the air cleaner, 2 is the long pipe, 3
is a carburetor, 4 is a main jet, 5 is a main air jet, and 7 is a breather, which are similar to conventional carburetors. Reference numeral 11 denotes an element made of, for example, a cylindrical foamed porous body for adjusting ventilation resistance. Reference numeral 12 denotes a blowback prevention plate (a plate used in ordinary air cleaners with appropriate holes drilled in it). 1
6 is a joint with a step for positioning the element 11, and a blowback prevention plate 12 is attached to the vaporizer 3.
There is a positioning step between the two.
That is, an inlet passage 16-1 with a reduced passage cross-sectional area is formed on the upstream side of the joint 16, followed by an outlet passage 16-2 with a step and a passage cross-sectional area larger than that of the inlet 16-1. This exit passage 1
6-2 houses an airflow resistance adjusting element 11 made of a foamed porous material with uniform distribution. The blowback prevention plate 12 also serves to prevent the element 11 from flowing out.
本考案の作用について説明する。 The operation of the present invention will be explained.
(1) 空燃比が薄くなる理由
第3図に長蛇管2を採用した時と採用しない時
の各部の圧力を示す。(1) Reasons why the air-fuel ratio becomes lean Figure 3 shows the pressure at each part when the long tube 2 is used and when it is not used.
長蛇管2を採用した場合、長蛇管2はサージタ
ンクの役割をはたし、主空気ジエツト5←\前の圧
力が長蛇管2を採用しない場合より負圧が小さく
なる。なお汎用エンジン←\は単気筒が多いため長
蛇管2のサージタンクとしての役割は大きい。ま
た主空気ジエツト5後の負圧は長蛇管2を採用し
た場合、採用しない場合よりも小さくなる。 When the long tube 2 is used, the long tube 2 serves as a surge tank, and the pressure in front of the main air jet 5 becomes smaller than when the long tube 2 is not used. Furthermore, since most general-purpose engines have single cylinders, the long pipe 2 plays a large role as a surge tank. Further, the negative pressure after the main air jet 5 is smaller when the long tube 2 is used than when it is not used.
一方気化器が供給する燃料流量は、大気圧と主
ジエツト4後との差圧大小に比例する。したがつ
て長蛇管2を採用すると採用しない場合に比べ、
主ジエツト4後の負圧が小さくなるため気化器が
供給する燃料流量が減少する。 On the other hand, the fuel flow rate supplied by the carburetor is proportional to the pressure difference between the atmospheric pressure and the back of the main jet 4. Therefore, if long tube 2 is used, compared to not using it,
Since the negative pressure after the main jet 4 is reduced, the fuel flow rate supplied by the carburetor is reduced.
一方汎用エンジンの場合、長蛇管2の長さによ
るエンジンへの空気流量はほとんど変化しない。
すなわち、長蛇管2を採用した場合に空燃比が薄
くなるのは、主空気ジエツト5前の負圧が小さく
なり燃料流量が減少するためである。 On the other hand, in the case of a general-purpose engine, the air flow rate to the engine hardly changes depending on the length of the long tube 2.
That is, the reason why the air-fuel ratio becomes thinner when the elongated pipe 2 is adopted is because the negative pressure in front of the main air jet 5 becomes smaller and the fuel flow rate decreases.
(2) 本考案の作用
長蛇管2の影響を小さくするには、主空気ジエ
ツト5前の負圧を長蛇管2を採用しない時の負圧
に近づければよい。すなわち、気化器3前の接手
16の入口通路16−1による絞りと発泡多孔体
のエレメント11および吹き返し防止板12の存
在とによる微調整機能により負圧調整を容易に行
ない、主空気ジエツト5前の圧力が長蛇管を採用
した場合でも採用しない場合とほぼ同一の値とな
るようにするのである。すなわち、各部の圧力が
長蛇管2を採用しない場合に近づく。(2) Effect of the present invention In order to reduce the influence of the long flexible pipe 2, the negative pressure in front of the main air jet 5 should be brought close to the negative pressure when the long flexible pipe 2 is not used. That is, the negative pressure can be easily adjusted by the restriction by the inlet passage 16-1 of the joint 16 in front of the carburetor 3 and the fine adjustment function by the presence of the porous foam element 11 and the blowback prevention plate 12. The pressure is made to be almost the same even when the long tube is used as when it is not used. That is, the pressure at each part approaches that when the long tube 2 is not used.
本考案は以上の構成よりなり、次のような効果
を奏するものである。 The present invention has the above configuration and has the following effects.
(1) 長蛇管の採用にもかかわらず採用しない場合
と比べて主空気ジエツト前の圧力は変化が小さ
いため、容易に気化器の燃料流量特性が適性に
調整される。(1) Despite the adoption of a long serpentine tube, the pressure before the main air jet changes less than when it is not used, so the fuel flow characteristics of the carburetor can be easily adjusted to an appropriate value.
(2) したがつて、開発調整時間が大幅に短縮され
る。(2) Therefore, development adjustment time is significantly reduced.
第1図は従来の気化器の概略図、第2図は本考
案の気化器の一実施例の概略図、第3図は気化器
に長蛇管を採用したと採用しない時の各部の圧力
を示す図である。
1……エアクリーナ、2……長蛇管、3……気
化、4……主ジエツト、5……主空気ジエツト、
11……通気調整用エレメント、12……吹き返
し防止板、16……接手、16−1…入口通路、
16−2…出口通路。
Fig. 1 is a schematic diagram of a conventional vaporizer, Fig. 2 is a schematic diagram of an embodiment of the vaporizer of the present invention, and Fig. 3 shows the pressure in various parts when a long meandering tube is used in the vaporizer and when it is not. FIG. 1... Air cleaner, 2... Long pipe, 3... Vaporization, 4... Main jet, 5... Main air jet,
11...Airflow adjustment element, 12...Blowback prevention plate, 16...Joint, 16-1...Inlet passage,
16-2...Exit passage.
Claims (1)
され、長蛇管2を有する汎用エンジンのアウタエ
アベント式気化器において、気化器上流側に、(イ)
通路断面を絞つた入口通路16−1と、(ロ)通路断
面が前記入口通路より大きい出口通路16−2
と、(ハ)この出口通路内に一様に分布する通気抵抗
調整用エレメント11と、(ニ)前記出口通路端面に
配設された吹き返し防止板12とより構成される
接手を設けたことを特徴とする気化器。 In an outer air vent type carburetor for a general-purpose engine in which the air cleaner 1 is installed far away from the carburetor 3 and has a long pipe 2, (a)
(b) an inlet passage 16-1 with a narrow passage cross-section; and (b) an outlet passage 16-2 with a passage cross-section larger than the inlet passage.
and (c) a joint consisting of an airflow resistance adjusting element 11 uniformly distributed within the outlet passage, and (d) a blowback prevention plate 12 disposed on the end face of the outlet passage. Characteristic vaporizer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19357583U JPS60102453U (en) | 1983-12-17 | 1983-12-17 | vaporizer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19357583U JPS60102453U (en) | 1983-12-17 | 1983-12-17 | vaporizer |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS60102453U JPS60102453U (en) | 1985-07-12 |
JPH0134693Y2 true JPH0134693Y2 (en) | 1989-10-23 |
Family
ID=30416312
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19357583U Granted JPS60102453U (en) | 1983-12-17 | 1983-12-17 | vaporizer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS60102453U (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4521252B2 (en) * | 2004-11-18 | 2010-08-11 | ヤンマー株式会社 | Engine intake reduction mechanism |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5637084U (en) * | 1979-08-29 | 1981-04-09 | ||
JPS5643463B2 (en) * | 1974-01-23 | 1981-10-13 | ||
JPS577812U (en) * | 1980-06-16 | 1982-01-16 | ||
JPS5843657U (en) * | 1981-09-12 | 1983-03-24 | パイオニア株式会社 | Tape entrainment prevention device |
JPS58197457A (en) * | 1982-05-13 | 1983-11-17 | Honda Motor Co Ltd | Carbureter |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6229657Y2 (en) * | 1979-09-11 | 1987-07-30 | ||
JPS5892455U (en) * | 1981-12-17 | 1983-06-22 | 小松ゼノア株式会社 | air cleaner |
-
1983
- 1983-12-17 JP JP19357583U patent/JPS60102453U/en active Granted
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5643463B2 (en) * | 1974-01-23 | 1981-10-13 | ||
JPS5637084U (en) * | 1979-08-29 | 1981-04-09 | ||
JPS577812U (en) * | 1980-06-16 | 1982-01-16 | ||
JPS5843657U (en) * | 1981-09-12 | 1983-03-24 | パイオニア株式会社 | Tape entrainment prevention device |
JPS58197457A (en) * | 1982-05-13 | 1983-11-17 | Honda Motor Co Ltd | Carbureter |
Also Published As
Publication number | Publication date |
---|---|
JPS60102453U (en) | 1985-07-12 |
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