JPH0229861B2 - - Google Patents
Info
- Publication number
- JPH0229861B2 JPH0229861B2 JP56206060A JP20606081A JPH0229861B2 JP H0229861 B2 JPH0229861 B2 JP H0229861B2 JP 56206060 A JP56206060 A JP 56206060A JP 20606081 A JP20606081 A JP 20606081A JP H0229861 B2 JPH0229861 B2 JP H0229861B2
- Authority
- JP
- Japan
- Prior art keywords
- suction piston
- needle
- suction
- raised
- bench lily
- 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 - Lifetime
Links
- 241000234435 Lilium Species 0.000 claims description 23
- 239000000446 fuel Substances 0.000 claims description 16
- 238000011144 upstream manufacturing Methods 0.000 claims description 9
- 230000006835 compression Effects 0.000 description 10
- 238000007906 compression Methods 0.000 description 10
- 125000006850 spacer group Chemical group 0.000 description 4
- 238000000889 atomisation Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M7/00—Carburettors with means for influencing, e.g. enriching or keeping constant, fuel/air ratio of charge under varying conditions
- F02M7/12—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves
- F02M7/14—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves with means for controlling cross-sectional area of fuel spray nozzle
- F02M7/16—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves with means for controlling cross-sectional area of fuel spray nozzle operated automatically, e.g. dependent on exhaust-gas analysis
- F02M7/17—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves with means for controlling cross-sectional area of fuel spray nozzle operated automatically, e.g. dependent on exhaust-gas analysis by a pneumatically adjustable piston-like element, e.g. constant depression carburettors
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of The Air-Fuel Ratio Of Carburetors (AREA)
Description
【発明の詳細な説明】 本発明は可変ベンチユリ型気化器に関する。[Detailed description of the invention] The present invention relates to a variable bench lily type carburetor.
可変ベンチユリ型気化器においてサクシヨンピ
ストンを押圧する圧縮ばねのばね力を強くすると
サクシヨンピストンの摺動ヒステリシスが小さく
なるためにサクシヨンピストンのリフト量が増大
するときと減少するときとで供給燃料量のばらつ
きが小さくなり、斯くして吸入空気量に応じた適
切な量の燃料を常時供給することができる。更
に、サクシヨンピストンを押圧する圧縮ばねのば
ね力を強くするとサクシヨンピストンの駆動力が
大きくなるためにサクシヨンピストンに異物が挟
まつたとき、或いはサクシヨンピストンが凍結し
たときでもサクシヨンピストンを移動させること
ができる。従つて可変ベンチユリ型気化器ではサ
クシヨンピストンを押圧する圧縮ばねのばね力を
強くすることが好ましい。しかしながら従来の可
変ベンチユリ型気化器ではこの圧縮ばねのばね力
を強くすると吸入空気量が多いときにサクシヨン
ピストンが吸気通路を全開しなくなるために圧縮
ばねのばね力を強めることができない。 In a variable bench lily type carburetor, when the spring force of the compression spring that presses the suction piston is increased, the sliding hysteresis of the suction piston becomes smaller, so that the amount of fuel supplied changes when the lift amount of the suction piston increases and when it decreases. Variations in the amount of fuel are reduced, and thus an appropriate amount of fuel can be constantly supplied depending on the amount of intake air. Furthermore, if the spring force of the compression spring that presses the suction piston is strengthened, the driving force of the suction piston will be increased. It can be moved. Therefore, in a variable bench lily type carburetor, it is preferable to increase the spring force of the compression spring that presses the suction piston. However, in conventional variable bench lily type carburetors, if the spring force of the compression spring is strengthened, the suction piston will not fully open the intake passage when the amount of intake air is large, so the spring force of the compression spring cannot be strengthened.
本発明はサクシヨンピストンを押圧する圧縮ば
ねのばね力を強めても吸入空気量が多いときにサ
クシヨンピストンが吸気通路を全開できるように
した可変ベンチユリ型気化器を提供することにあ
る。 An object of the present invention is to provide a variable bench lily type carburetor which allows the suction piston to fully open the intake passage when the amount of intake air is large even if the spring force of the compression spring that presses the suction piston is strengthened.
以下、添付図面を参照して本発明を詳細に説明
する。 Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
第１図を参照すると、１は気化器本体、２は垂
直方向に延びる吸気通路、３は吸気通路２内を横
方向に移動するサクシヨンピストン、４はサクシ
ヨンピストン３の先端面に取付けられたニード
ル、５はサクシヨンピストン３の先端面に対向し
て吸気通路２の内壁面上に固定されたスペーサ、
６はサクシヨンピストン３下流の吸気通路２内に
設けられたスロツトル弁、７は気化器フロート室
を夫々示し、サクシヨンピストン３の先端面とス
ペーサ５の間にはベンチユリ部８が形成される。
気化器本体１には中空円筒状のケーシング９が固
定され、このケーシング９にはケーシング９の内
部でケーシング９の軸線方向に延びる案内スリー
ブ１０が取付けられる。案内スリーブ１０内には
多数のボール１１を具えた軸受１２が挿入され、
また案内スリーブ１０の外端部は盲蓋１３によつ
て閉鎖される。一方、サクシヨンピストン３には
案内ロツド１４が固定され、この案内ロツド１４
は軸受１２内に案内ロツド１４の軸線方向に移動
可能に挿入される。このようにサクシヨンピスト
ン３は軸受１２を介してケーシング９により支持
されるのでサクシヨンピストン３はその軸線方向
に滑らかに移動することができる。ケーシング９
の内部はサクシヨンピストン３によつて負圧室１
５と大気圧室１６とに分割され、負圧室１５内に
はサクシヨンピストン３を常時ベンチユリ部８に
向けて押圧する圧縮ばね１０が挿入される。負圧
室１５はサクシヨンピストン３に形成されたサク
シヨン孔１８を介してベンチユリ部８に連結さ
れ、大気圧室１６は気化器本体１に形成された空
気孔１９を介してサクシヨンピストン３上流の吸
気通路２内に連結される。 Referring to FIG. 1, 1 is a carburetor main body, 2 is an intake passage extending vertically, 3 is a suction piston that moves laterally within the intake passage 2, and 4 is attached to the tip surface of the suction piston 3. 5 is a spacer fixed on the inner wall surface of the intake passage 2 facing the tip surface of the suction piston 3;
Reference numeral 6 indicates a throttle valve provided in the intake passage 2 downstream of the suction piston 3, and reference numeral 7 indicates a carburetor float chamber. A bench lily portion 8 is formed between the tip surface of the suction piston 3 and the spacer 5. .
A hollow cylindrical casing 9 is fixed to the carburetor body 1, and a guide sleeve 10 extending in the axial direction of the casing 9 inside the casing 9 is attached. A bearing 12 with a number of balls 11 is inserted into the guide sleeve 10,
Furthermore, the outer end of the guide sleeve 10 is closed by a blind cover 13. On the other hand, a guide rod 14 is fixed to the suction piston 3.
is inserted into the bearing 12 so as to be movable in the axial direction of the guide rod 14. Since the suction piston 3 is thus supported by the casing 9 via the bearing 12, the suction piston 3 can move smoothly in its axial direction. Casing 9
The interior of the is a negative pressure chamber 1 by a suction piston 3.
5 and an atmospheric pressure chamber 16, and a compression spring 10 is inserted into the negative pressure chamber 15 to constantly press the suction piston 3 toward the bench lily portion 8. The negative pressure chamber 15 is connected to the bench lily section 8 through a suction hole 18 formed in the suction piston 3, and the atmospheric pressure chamber 16 is connected to the suction piston 3 upstream through an air hole 19 formed in the carburetor body 1. The intake passage 2 is connected to the inside of the intake passage 2.
一方、気化器本体１内にはニードル４が侵入可
能なようにニードル４の軸線方向に延びる燃料通
路２０が形成され、この燃料通路２０内には計量
ジエツト２１が設けられる。計量ジエツト２１上
流の燃料通路２０は下方に延びる燃料パイプ２２
を介してフロート室７に連結され、フロート室７
内の燃料はこの燃料パイプ２２を介して燃料通路
２０内に送り込まれる。更に、スペーサ５には燃
料通路２０と共軸的に配置された中空円筒状のノ
ズル２３が固定される。このノズル２３はスペー
サ５の内壁面からベンチユリ部８内に突出し、し
かもノズル２３の先端部の上半分は下半分から更
にサクシヨンピストン３に向けて突出している。
ニードル４はノズル２３並びに計量ジエツト２１
内を貫通して延び、燃料はニードル４と計量ジエ
ツト２１間に形成される環状間隙により計量され
た後にノズル２３から吸気通路２内に供給され
る。 On the other hand, a fuel passage 20 extending in the axial direction of the needle 4 is formed in the carburetor body 1 so that the needle 4 can enter therein, and a metering jet 21 is provided within this fuel passage 20. The fuel passage 20 upstream of the metering jet 21 has a fuel pipe 22 extending downward.
is connected to the float chamber 7 via the float chamber 7.
The fuel inside is sent into the fuel passage 20 via this fuel pipe 22. Furthermore, a hollow cylindrical nozzle 23 arranged coaxially with the fuel passage 20 is fixed to the spacer 5 . This nozzle 23 protrudes into the bench lily portion 8 from the inner wall surface of the spacer 5, and the upper half of the tip of the nozzle 23 further protrudes from the lower half toward the suction piston 3.
Needle 4 is connected to nozzle 23 and metering jet 21
The fuel is metered by the annular gap formed between the needle 4 and the metering jet 21 and then fed into the intake passage 2 from the nozzle 23.
第１図から第４図を参照すると、サクシヨンピ
ストン３の先端部はニードル４から上流に向けて
徐々に***しており、この***面２５の中央部に
は断面Ｖ字形の溝２６が形成される。従つて***
面２５は溝２６の底部に向けて傾斜する一対の傾
斜壁部２５ａを有し、これら傾斜壁部２５ａの一
方にサクシヨン孔１８が形成される。第４図から
わかるようにサクシヨンピストン先端面の上流端
２７はＶ字形をなしており、このＶ字形上流端２
７と対向する吸気通路２の内壁面上には吸気通路
２内に向けて水平方向に突出する***壁２４（第
１図）が形成される。これらのサクシヨンピスト
ン先端面上流端２７と***壁２４はそれらの間に
吸入空気流入制御絞り部を形成する。機関運転が
開始されると空気は吸気通路２内を下方に向けて
流れる。このとき空気流はピストン先端面上流端
２７と***壁２４間において絞られるためにベン
チユリ部８には負圧が発生し、この負圧がサクシ
ヨン孔１８を介して負圧室１５内に導びかれる。
サクシヨンピストン３は負圧室１５と大気圧室１
６との圧力差が圧縮ばね１７のばね力により定ま
るほぼ一定圧となるように、即ちベンチユリ部８
内の負圧がほぼ一定ととなるように移動する。 Referring to FIGS. 1 to 4, the tip of the suction piston 3 is gradually raised upstream from the needle 4, and a groove 26 with a V-shaped cross section is formed in the center of this raised surface 25. be done. Therefore, the raised surface 25 has a pair of inclined walls 25a that are inclined toward the bottom of the groove 26, and the suction hole 18 is formed in one of these inclined walls 25a. As can be seen from FIG. 4, the upstream end 27 of the suction piston tip surface is V-shaped, and this V-shaped upstream end 2
A raised wall 24 (FIG. 1) that projects horizontally into the intake passage 2 is formed on the inner wall surface of the intake passage 2 facing the intake passage 7 . The upstream end 27 of the tip surface of the suction piston and the raised wall 24 form an intake air inflow control throttle section therebetween. When engine operation is started, air flows downward in the intake passage 2. At this time, the airflow is constricted between the upstream end 27 of the piston tip surface and the raised wall 24, so negative pressure is generated in the bench lily portion 8, and this negative pressure is guided into the negative pressure chamber 15 through the suction hole 18. It will be destroyed.
The suction piston 3 has a negative pressure chamber 15 and an atmospheric pressure chamber 1.
6, so that the pressure difference between the bench lily portion 8 and the
Move so that the negative pressure inside remains almost constant.
このようにサクシヨンピストン３はベンチユリ
部８内の負圧が一定となるように移動するがベン
チユリ部８内の負圧はベンチユリ部８内の全領域
に亘つて一定ではなく、ベンチユリ領域内で場所
毎に夫々異なつた大きさになつている。第６図は
第５図に示すように種々の位置にサクシヨン孔１
８を設けた場合に負圧室１５内に発生する負圧の
大きさを示している。第６図において縦軸Ｐは負
圧室１５の負圧（mmAq）を示し、横軸Ｑは吸
入空気量（gr／sec）を示す。なお、第６図にお
いて曲線ａ，ｂ，ｃ，ｄは夫々第５図の位置ａ、
ｂ、ｃ、ｄにサクシヨン孔１８を設けた場合の実
験結果を示す。更に、第６図において破線ｅは第
７図並びに第８図に示すようにサクシヨンピスト
ン３が平坦な先端面を有し、ニードル４後流のサ
クシヨンピストン先端面にサクシヨン孔１８を形
成した従来の可変ベンチユリ型気化器について示
している。第６図からわかるようにサクシヨン孔
１８を第５図の位置ａに形成した場合には他の位
置ｂ、ｃ、ｄ並びに従来の可変ベンチユリ型気化
器（破線ｅ）に形成した場合に比べて負圧室１５
内の負圧がかなり大きくなる。負圧室１５内の負
圧が大きくなるということはそれだけ圧縮ばね１
７のばね力を強めることができることを意味して
いる。 In this way, the suction piston 3 moves so that the negative pressure within the bench lily section 8 is constant, but the negative pressure within the bench lily section 8 is not constant over the entire area within the bench lily section 8, but within the bench lily section. Each location has a different size. Figure 6 shows suction holes 1 in various positions as shown in Figure 5.
8 shows the magnitude of the negative pressure generated in the negative pressure chamber 15. In FIG. 6, the vertical axis P shows the negative pressure (mmAq) in the negative pressure chamber 15, and the horizontal axis Q shows the intake air amount (gr/sec). In addition, in FIG. 6, curves a, b, c, and d are at positions a and d in FIG. 5, respectively.
Experimental results when suction holes 18 are provided in b, c, and d are shown. Furthermore, in FIG. 6, the broken line e indicates that the suction piston 3 has a flat tip surface as shown in FIGS. 7 and 8, and a suction hole 18 is formed in the suction piston tip surface downstream of the needle 4. A conventional variable bench lily type carburetor is shown. As can be seen from FIG. 6, when the suction hole 18 is formed at position a in FIG. Negative pressure chamber 15
The negative pressure inside becomes quite large. The larger the negative pressure in the negative pressure chamber 15, the more the compression spring 1
This means that the spring force of 7 can be strengthened.
このように本発明によればサクシヨンピストン
先端面の形状を独特の形状とすることにより同一
の吸入空気量に対して従来よりも高い負圧をサク
シヨンピストンの負圧室内に導びくことができ、
斯くしてサクシヨンピストンを押圧する圧縮ばね
のばね力を強めることができる。その結果、サク
シヨンピストンの摺動ヒステリシスが小さくなる
ために燃料の供給量が安定し、更にサクシヨンピ
ストンに異物が挟まつたり、或いはサクシヨンピ
ストンが凍結してもサクシヨンピストンを強制的
に移動せしめることができる。また、第６図にお
いて曲線ａと破線ｅを比較すると吸入空気量Ｑが
多いときには負圧Ｐに大きな差があるが吸入空気
量Ｑが少なくなると負圧Ｐにほとんど差がなくな
る。従つて吸入空気量Ｑが多いときにサクシヨン
ピストンが吸気通路を全開するようにサクシヨン
ピストンの圧縮ばねのばね力を設定すると、吸入
空気量Ｑが少ない場合には本発明の方が従来の可
変ベンチユリ型気化器に比べてベンチユリ部の負
圧が大きくなり、それだけ吸入空気の流速が速め
られる。従つて吸入空気量Ｑが少ないときの燃料
の霧化を促進できることになる。 As described above, according to the present invention, by making the shape of the end surface of the suction piston unique, it is possible to introduce a higher negative pressure into the negative pressure chamber of the suction piston than before for the same amount of intake air. I can,
In this way, the spring force of the compression spring that presses the suction piston can be increased. As a result, the sliding hysteresis of the suction piston is reduced, which stabilizes the amount of fuel supplied, and even if a foreign object gets caught in the suction piston or the suction piston freezes, the suction piston cannot be forcibly moved. It can be moved. Further, when comparing the curve a and the broken line e in FIG. 6, there is a large difference in the negative pressure P when the intake air amount Q is large, but when the intake air amount Q is small, there is almost no difference in the negative pressure P. Therefore, if the spring force of the compression spring of the suction piston is set so that the suction piston fully opens the intake passage when the intake air amount Q is large, then when the intake air amount Q is small, the present invention is better than the conventional one. Compared to a variable bench lily type carburetor, the negative pressure in the bench lily portion is greater, and the flow rate of intake air is increased accordingly. Therefore, atomization of fuel can be promoted when the amount of intake air Q is small.
第１図は本発明による可変ベンチユリ型気化器
の側面断面図、第２図は第１図の矢印Ａに沿つて
みたサクシヨンピストン先端面の正面図、第３図
は第２図の−線に沿つてみた断面図、第４図
は第２図の−線に沿つてみた断面図、第５図
はサクシヨンピストン先端面の正面図、第６図は
サクシヨンピストン負圧室内の負圧と吸入空気量
の関係を示す図、第７図は従来のサクシヨンピス
トンの側面断面図、第８図は第７図のサクシヨン
ピストン先端面の正面図である。
１……気化器本体、３……サクシヨンピスト
ン、４……ニードル、６……スロツトル弁、１８
……サクシヨン孔、２４……***壁。
Fig. 1 is a side sectional view of a variable bench lily type carburetor according to the present invention, Fig. 2 is a front view of the suction piston tip surface taken along arrow A in Fig. 1, and Fig. 3 is a - line in Fig. 2. Figure 4 is a cross-sectional view taken along the - line in Figure 2, Figure 5 is a front view of the suction piston tip, and Figure 6 is the negative pressure inside the suction piston negative pressure chamber. FIG. 7 is a side sectional view of a conventional suction piston, and FIG. 8 is a front view of the tip of the suction piston in FIG. 7. 1... Carburetor body, 3... Suction piston, 4... Needle, 6... Throttle valve, 18
... Suction hole, 24... Raised wall.
Claims (1)
させるサクシヨンピストンと、該サクシヨンピス
トンに連結されたニードルと、該ニードルが侵入
可能なように該ニードルの軸線方向に延びる燃料
通路と、該燃料通路内に設けられて該ニードルと
協働する計量ジエツトとを具備した可変ベンチユ
リ型気化器において、サクシヨンピストン先端面
と対向する吸気通路内壁面上に吸気通路内に突出
する***壁を形成し、上記サクシヨンピストン先
端面を上記ニードルから上流側に向かつて徐々に
***せしめて該***先端面の上流側端部と該***
壁間に吸入空気流入制御絞り部を形成し、上記隆
起先端面が吸入空気の流れ方向に延びる溝と該溝
の底部に向けて傾斜する一対の傾斜壁面からなる
断面Ｖ字形をなし、該絞り部の後流に形成される
ベンチユリ部とサクシヨンピストン負圧室とを連
通するサクシヨン孔をサクシヨンピストン***先
端面の上記傾斜壁面上に形成した可変ベンチユリ
型気化器。1. A suction piston that changes the area of the bench lily in response to the amount of intake air, a needle connected to the suction piston, a fuel passage extending in the axial direction of the needle so that the needle can enter, and the fuel In a variable bench lily type carburetor provided with a metering jet disposed in a passage and cooperating with the needle, a raised wall protruding into the intake passage is formed on the inner wall surface of the intake passage facing the tip surface of the suction piston. , the suction piston tip surface is gradually raised upstream from the needle to form an intake air inflow control constriction between the upstream end of the raised tip surface and the raised wall; has a V-shaped cross section consisting of a groove extending in the flow direction of the intake air and a pair of inclined wall surfaces inclined toward the bottom of the groove, and a bench lily portion and a suction piston negative pressure chamber formed downstream of the throttle portion. A variable bench lily type carburetor in which a suction hole communicating with the suction piston is formed on the inclined wall surface of the raised end surface of the suction piston.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20606081A JPS58107856A (en) | 1981-12-22 | 1981-12-22 | Variable venturi carburetor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20606081A JPS58107856A (en) | 1981-12-22 | 1981-12-22 | Variable venturi carburetor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58107856A JPS58107856A (en) | 1983-06-27 |
| JPH0229861B2 true JPH0229861B2 (en) | 1990-07-03 |
Family
ID=16517188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20606081A Granted JPS58107856A (en) | 1981-12-22 | 1981-12-22 | Variable venturi carburetor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58107856A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6143257A (en) * | 1984-08-07 | 1986-03-01 | Toyota Motor Corp | Variable venturi type carburetor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5859344A (en) * | 1981-10-05 | 1983-04-08 | Toyota Motor Corp | Variable venturi type carburettor |
-
1981
- 1981-12-22 JP JP20606081A patent/JPS58107856A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5859344A (en) * | 1981-10-05 | 1983-04-08 | Toyota Motor Corp | Variable venturi type carburettor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58107856A (en) | 1983-06-27 |
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