JP2804188B2 - Throttle body - Google Patents
Throttle bodyInfo
- Publication number
- JP2804188B2 JP2804188B2 JP3172151A JP17215191A JP2804188B2 JP 2804188 B2 JP2804188 B2 JP 2804188B2 JP 3172151 A JP3172151 A JP 3172151A JP 17215191 A JP17215191 A JP 17215191A JP 2804188 B2 JP2804188 B2 JP 2804188B2
- Authority
- JP
- Japan
- Prior art keywords
- air passage
- throttle valve
- throttle
- bypass
- air flow
- 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 - Fee Related
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は、内燃機関に流入する空
気流量を検出する熱線式空気流量計の、バイパス空気通
路を一体とするスロットルボディにおいて、絞弁の影響
を軽減させ、空気流量計の流量計量精度を向上させるこ
とができる流入空気量制御構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air flow meter for a hot wire air flow meter for detecting the flow rate of air flowing into an internal combustion engine, which reduces the influence of a throttle valve in a throttle body having an integral bypass air passage. The present invention relates to an inflow air amount control structure capable of improving flow rate measurement accuracy.
【０００２】[0002]
【従来の技術】従来の装置は、特開平2−108920 号に記
載の様にバイパス通路出口部と主空気通路テーパ部との
位置関係については考慮されていたが、テーパ部と絞弁
先端部との位置関係における絞弁高開度域での絞弁の空
気流量計量精度に与える影響について十分な考慮がされ
ておらず、又、影響を与えなくなる程絞弁とバイパス空
気通路出口との距離を遠くとると、スロットルボディの
大型，重量増，コストアップに継がる問題があった。2. Description of the Related Art In a conventional apparatus, as described in Japanese Patent Application Laid-Open No. 2-108920, the positional relationship between a bypass passage outlet and a main air passage taper is considered. The effect on the air flow measurement accuracy of the throttle valve in the throttle opening high opening range in the positional relationship between the throttle valve and the bypass air passage outlet has not been sufficiently considered, and the distance between the throttle valve and the bypass air passage outlet has been reduced to such an extent that the throttle valve no longer has an effect. If the distance is too far, there is a problem that the size of the throttle body, weight increase and cost increase.
【０００３】[0003]
【発明が解決しようとする課題】従来の熱線式空気流量
計を有するスロットルボディは、空気流量計量用バイパ
ス空気通路出口と、空気量制御用絞弁との距離が遠いた
め、絞弁により発生する空気流れの乱れによる空気流量
計量精度悪化に対する十分な配慮がなされていなかっ
た。In a throttle body having a conventional hot-wire type air flow meter, the throttle valve is generated by the throttle valve because the distance between the air flow metering bypass air passage outlet and the throttle valve for controlling the air amount is long. Sufficient consideration has not been given to the deterioration of the air flow measurement accuracy due to the turbulence of the air flow.
【０００４】本発明は、バイパス空気通路出口と絞弁を
極力近付けた構造で、かつ絞弁の高開度域での空気流量
計量精度向上を目的とする。An object of the present invention is to provide a structure in which the outlet of a bypass air passage and a throttle valve are as close as possible, and to improve the accuracy of air flow measurement in a high opening region of the throttle valve.
【０００５】本発明の他の目的は、バイパス空気通路と
絞弁を極力近付けることにより、小型，軽量，ローコス
ト化を図ることにもある。Another object of the present invention is to reduce the size, weight and cost by bringing the bypass air passage and the throttle valve as close as possible.
【０００６】[0006]
【課題を解決するための手段】上記目的の達成は、請求
範囲に示す様に、絞弁高開度域における絞弁先端部の位
置を、バイパス空気通路出口が位置する主空気通路の断
面積が段階的に減少するテーパ部に設けることによりで
きる。In order to achieve the above-mentioned object, as described in the claims, the position of the throttle valve tip portion in the throttle valve high opening region is determined by changing the cross-sectional area of the main air passage where the bypass air passage outlet is located. Can be achieved by providing the tapered portion with a stepwise decrease.
【０００７】[0007]
【作用】熱線式空気流量計の計量精度は、主空気通路の
形状，バイパス空気通路出口と絞弁の距離，絞弁の開度
等圧力変動に影響を与える諸要素に起因する。今回、絞
弁高開度域での空気流量計量精度の向上を図るため、絞
弁高開度時の絞弁先端部を、主空気通路のテーパー部に
位置させることにより計量精度への影響を低減させた。
更に本発明により、従来の装置よりバイパス空気通路出
口と絞弁との間の距離を短く設定することができるた
め、小型，軽量，ローコスト化を図ることができる。The metering accuracy of the hot-wire air flow meter is due to various factors that affect pressure fluctuations, such as the shape of the main air passage, the distance between the bypass air passage outlet and the throttle valve, and the degree of opening of the throttle valve. This time, in order to improve the air flow measurement accuracy in the throttle valve high opening range, the influence on the metering accuracy by positioning the tip of the throttle valve at the time of the throttle valve high opening in the taper part of the main air passage is reduced. Reduced.
Further, according to the present invention, the distance between the outlet of the bypass air passage and the throttle valve can be set shorter than in the conventional device, so that the size, weight, and cost can be reduced.
【０００８】[0008]
【実施例】以下、本発明の一実施例を図１，図２，図３
により説明する。図１は、主空気通路１に、空気流量計
量用バイパス空気通路２と絞弁３を有するスロットルボ
ディの断面図である。従来型スロットルボディ４ａは、
絞弁３の回動域が主空気通路の平行部５内に納まる構造
となっている。これに対し、本発明のスロットルボディ
４ｂは、絞弁高開度域において絞弁の先端部３ａが主空
気通路のテーパー部６にかかる構造になっている。従来
型スロットルボディ４ａでは、絞弁３の高開度域におい
て上流から流入した空気が絞弁上流側開口部７を通過す
る際に、絞弁先端部３ａと主空気通路壁面から剥離した
空気８により図２の如く、開口面積がせばめられ、空気
流量が減少してしまうため、バイパス通路出口２ａ付近
の圧力が低下し、主空気通路１内の空気流量と、バイパ
ス空気通路内２の空気流量とのバランスがくずれ、空気
流量計量精度が悪化してしまう。これに対し、本発明で
は、絞弁高開度域において絞弁の先端部３ａが主空気通
路１のテーパー部６にあるため、剥離した空気８の影響
による開口面積減少が少なく、又、開口面積がＳ1＜Ｓ2
であるため、従来型に対し、図３の如く計量精度の悪化
を防止できる。又、バイパス空気通路出口２ａと絞弁３
の距離を極力近づけることができるため、スロットルボ
ディの小型，軽量，ローコスト化を図ることができる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described with reference to FIGS.
This will be described below. FIG. 1 is a sectional view of a throttle body having a main air passage 1 having a bypass air passage 2 for measuring an air flow rate and a throttle valve 3. The conventional throttle body 4a
The rotation area of the throttle valve 3 is configured to be accommodated in the parallel portion 5 of the main air passage. On the other hand, the throttle body 4b of the present invention has a structure in which the distal end portion 3a of the throttle valve covers the tapered portion 6 of the main air passage in the throttle valve high opening region. In the conventional throttle body 4a, when air flowing from the upstream in the high opening region of the throttle valve 3 passes through the throttle valve upstream opening 7, the air 8 separated from the throttle valve tip 3a and the wall surface of the main air passage. As a result, as shown in FIG. 2, the opening area is reduced and the air flow rate is reduced, so that the pressure in the vicinity of the bypass passage outlet 2a decreases, and the air flow rate in the main air passage 1 and the air flow rate in the bypass air passage 2 And the balance with the air flow is lost, and the air flow rate measurement accuracy is deteriorated. On the other hand, according to the present invention, since the tip 3a of the throttle valve is located in the tapered portion 6 of the main air passage 1 in the throttle valve high opening region, the opening area is less reduced by the influence of the separated air 8, and The area is S 1 <S 2
Therefore, it is possible to prevent the measurement accuracy from being deteriorated as shown in FIG. Also, the bypass air passage outlet 2a and the throttle valve 3
Since the distance of the throttle body can be reduced as much as possible, the size, weight and cost of the throttle body can be reduced.
【０００９】[0009]
【発明の効果】本発明によれば、空気計量用バイパス空
気通路と絞弁を極力近づけた場合、絞弁高開度域での空
気流量計量精度を向上させることができる。又、これに
より、スロットルボディの小型，軽量，ローコスト化を
図ることができる。According to the present invention, when the bypass air passage for air measurement and the throttle valve are brought as close as possible, the accuracy of air flow measurement in the throttle valve high opening region can be improved. In addition, this makes it possible to reduce the size, weight, and cost of the throttle body.
【図１】従来品と本発明実施品のスロットルボディの断
面図である。FIG. 1 is a cross-sectional view of a conventional throttle body and a throttle body of the present invention.
【図２】本発明部分の詳細説明図である。FIG. 2 is a detailed explanatory view of a part of the present invention.
【図３】従来品と本発明品の性能差図である。FIG. 3 is a performance difference diagram between a conventional product and a product of the present invention.
１…主空気通路、２…バイパス空気通路、２ａ…バイパ
ス空気通路出口、３…絞弁、３ａ…絞弁先端部、４ａ…
従来型スロットルボディ、４ｂ…本発明スロットルボデ
ィ、５…主空気通路平行部、６…主空気通路テーパー
部、７…絞弁上流側開口部、８…剥離した空気。DESCRIPTION OF SYMBOLS 1 ... Main air passage, 2 ... Bypass air passage, 2a ... Bypass air passage outlet, 3 ... Throttle valve, 3a ... Throttle valve tip part, 4a ...
Conventional throttle body, 4b: throttle body of the present invention, 5: parallel portion of main air passage, 6: taper portion of main air passage, 7: upstream opening of throttle valve, 8: separated air.
フロントページの続き (72)発明者 田原 重則 茨城県勝田市大字高場字鹿島谷津2477番 地３ 日立オートモティブエンジニアリ ング株式会社内 (56)参考文献 特開 平４−318240（ＪＰ，Ａ) 実開 平２−103145（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) F02D 35/00 366 F02D 9/10Continued on the front page (72) Inventor Shigenori Tahara 2477 Kashima-Yatsu, Oaza-Kojita, Katsuta-shi, Ibaraki Prefecture Within Hitachi Automotive Engineering Co., Ltd. Kaihei 2-103145 (JP, U) (58) Field surveyed (Int. Cl. 6 , DB name) F02D 35/00 366 F02D 9/10
Claims (1)
本空気通路内に流入する空気量を制御する絞弁と、本主
空気通路内に入口と出口を有し、Ｌ字型に形成されるバ
イパス空気通路と、本バイパス空気通路内に空気流量計
量部を置く熱線式空気流量計を有するスロットルボディ
において、絞弁高開度域における絞弁先端部の位置が、
バイパス空気通路出口が位置する主空気通路の断面積が
段階的に減少するテーパー部にかかることを特徴とする
スロットルボディ。A main air passage for supplying air to an internal combustion engine;
A throttle valve for controlling an amount of air flowing into the main air passage, an L-shaped bypass air passage having an inlet and an outlet in the main air passage, and an air flow meter in the bypass air passage In the throttle body having a hot wire type air flow meter in which the throttle portion is located, the position of the throttle valve tip portion in the throttle valve high opening region is
A throttle body characterized in that the cross-sectional area of a main air passage where a bypass air passage outlet is located is applied to a tapered portion where the cross-sectional area decreases stepwise.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3172151A JP2804188B2 (en) | 1991-07-12 | 1991-07-12 | Throttle body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3172151A JP2804188B2 (en) | 1991-07-12 | 1991-07-12 | Throttle body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0518286A JPH0518286A (en) | 1993-01-26 |
| JP2804188B2 true JP2804188B2 (en) | 1998-09-24 |
Family
ID=15936515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3172151A Expired - Fee Related JP2804188B2 (en) | 1991-07-12 | 1991-07-12 | Throttle body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2804188B2 (en) |
-
1991
- 1991-07-12 JP JP3172151A patent/JP2804188B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0518286A (en) | 1993-01-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |