JPH0518286A - Throttle body - Google Patents
Throttle bodyInfo
- Publication number
- JPH0518286A JPH0518286A JP3172151A JP17215191A JPH0518286A JP H0518286 A JPH0518286 A JP H0518286A JP 3172151 A JP3172151 A JP 3172151A JP 17215191 A JP17215191 A JP 17215191A JP H0518286 A JPH0518286 A JP H0518286A
- Authority
- JP
- Japan
- Prior art keywords
- throttle valve
- air passage
- air flow
- main air
- throttle
- 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.)
- Granted
Links
- 230000007423 decrease Effects 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Landscapes
- Measuring Volume Flow (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Abstract
(57)【要約】
【目的】主空気通路と絞弁の位置関係を改善し、空気流
量計量精度を向上させる。
【構成】熱線式空気流量計を一体とするスロットルボデ
ィにおいて、主空気通路のテーパー部に、絞弁高開度域
において絞弁先端部が位置する様な主空気通路１と絞弁
３の構成とした。
【効果】熱線式空気流量計の空気流量計量精度が向上し
た。又、スロットルボディの小型，軽量，ローコスト化
を図ることが出来た。
(57) [Abstract] [Purpose] To improve the positional relationship between the main air passage and the throttle valve, and improve the accuracy of air flow measurement. [Structure] In a throttle body with an integrated hot-wire air flow meter, the main air passage 1 and the throttle valve 3 are arranged such that the throttle valve tip portion is located in the tapered portion of the main air passage in the high opening range of the throttle valve. And [Effect] The air flow metering accuracy of the hot wire air flow meter has been improved. In addition, we were able to reduce the size, weight and cost of the throttle body.
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 a hot wire type air flow meter for detecting the flow rate of air flowing into an internal combustion engine. The present invention relates to an inflow air amount control structure capable of improving the flow rate measurement accuracy of the.
【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 device, as described in JP-A-2-108920, the positional relationship between the bypass passage outlet portion and the main air passage taper portion is taken into consideration, but the taper portion and the throttle valve tip portion are taken into consideration. The influence of the throttle valve on the air flow metering accuracy in the high opening range of the throttle valve is not sufficiently considered, and the distance between the throttle valve and the bypass air passage outlet is so small that it does not affect the accuracy. However, if you take a long distance, there was a problem that the large throttle body, increased weight, and increased cost.
【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 the throttle body having the conventional hot-wire type air flow meter, since the distance between the outlet of the bypass air passage for air flow metering and the throttle valve for controlling the air amount is long, it is generated by the throttle valve. Sufficient consideration was not given to the deterioration of air flow measurement accuracy due to 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。It is an object of the present invention to have a structure in which the bypass air passage outlet and the throttle valve are as close as possible to each other, and to improve the accuracy of air flow metering in the high opening range 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。To achieve the above-mentioned object, as shown in the claims, the position of the throttle valve tip portion in the throttle valve high opening range is defined by the cross-sectional area of the main air passage where the bypass air passage outlet is located. Can be provided by providing the taper portion which gradually decreases.
【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 measuring 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 opening degree of the throttle valve. This time, in order to improve the accuracy of air flow metering in the high opening range of the throttle valve, positioning the tip of the throttle valve at the high opening of the throttle valve in the taper part of the main air passage will affect the accuracy of metering. Reduced.
Further, according to the present invention, the distance between the bypass air passage outlet and the throttle valve can be set shorter than that of 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 EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be described. FIG. 1 is a cross-sectional view of a throttle body having an air flow metering bypass air passage 2 and a throttle valve 3 in a main air passage 1. The conventional throttle body 4a is
The structure is such that the rotation range of the throttle valve 3 is contained within 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 front end portion 3a of the throttle valve is in contact with the taper portion 6 of the main air passage in the throttle valve high opening range. In the conventional throttle body 4a, when the air flowing in from the upstream in the high opening range of the throttle valve 3 passes through the throttle valve upstream side opening 7, the air 8 separated from the throttle valve tip 3a and the main air passage wall surface 8 As a result, as shown in FIG. 2, the opening area is narrowed and the air flow rate decreases, so the pressure near 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 are reduced. And the balance of the air flow rate and the air flow rate measurement accuracy deteriorates. On the other hand, in the present invention, since the tip portion 3a of the throttle valve is in the taper portion 6 of the main air passage 1 in the throttle valve high opening range, the reduction of the opening area due to the influence of the separated air 8 is small, and the opening area is small. Area is S 1 <S 2
Therefore, as compared with the conventional type, deterioration of the weighing accuracy can be prevented as shown in FIG. Further, the bypass air passage outlet 2a and the throttle valve 3
Since the distance can be minimized, the throttle body can be made small, lightweight and low cost.
【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 metering and the throttle valve are brought as close as possible, it is possible to improve the accuracy of air flow metering in the throttle valve high opening range. Further, 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 throttle body of a conventional product and a product 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 portion 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 the conventional product and the 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。1 ... Main air passage, 2 ... Bypass air passage, 2a ... Bypass air passage outlet, 3 ... Throttle valve, 3a ... Throttle valve tip portion, 4a ...
Conventional throttle body, 4b ... Throttle body of the present invention, 5 ... Main air passage parallel portion, 6 ... Main air passage taper portion, 7 ... Throttle valve upstream opening portion, 8 ... Peeled air.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山田 裕之 茨城県勝田市大字高場2520番地 株式会社 日立製作所自動車機器事業部内 (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 日立オートモテイブエンジニアリング 株式会社内 ─────────────────────────────────────────────────── ─── Continued front page (72) Hiroyuki Yamada Inventor Hiroyuki Yamada, Katsuta City, Ibaraki 2520, Takaba, Hitachi, Ltd. Automotive Equipment Division (72) Inventor Shigenori Tahara, Katsuta, Ibaraki, Japan 2477 Kashima Yatsu 3 Within Hitachi Automotive Engineering Co., Ltd.
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。Claim: What is claimed is: 1. A main air passage for supplying air to an internal combustion engine,
A throttle valve for controlling the 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 metering in the bypass air passage. In a throttle body having a hot-wire air flow meter on which a section is placed, the position of the throttle valve tip portion in the throttle valve high opening range is
A throttle body characterized in that a cross-sectional area of a main air passage in which a bypass air passage outlet is located is applied to a taper portion where the cross-sectional area gradually decreases.
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 true JPH0518286A (en) | 1993-01-26 |
| JP2804188B2 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 |
|---|---|
| JP2804188B2 (en) | 1998-09-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |