JPH05248904A - Heating resistance type air flow rate measuring device - Google Patents
Heating resistance type air flow rate measuring deviceInfo
- Publication number
- JPH05248904A JPH05248904A JP4046643A JP4664392A JPH05248904A JP H05248904 A JPH05248904 A JP H05248904A JP 4046643 A JP4046643 A JP 4046643A JP 4664392 A JP4664392 A JP 4664392A JP H05248904 A JPH05248904 A JP H05248904A
- Authority
- JP
- Japan
- Prior art keywords
- bypass passage
- cover
- flow rate
- air flow
- measuring device
- 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.)
- Pending
Links
Landscapes
- Measuring Volume Flow (AREA)
Abstract
(57)【要約】
【目的】本発明は、バイパス通路底面部カバーの取り付
け方法を改良することにより、バイパス通路底面部カバ
ー取り付けねじ及び底面部カバーの脱落防止を目的とす
る。また、バイパス通路底面部カバーの取り付け位置ば
らつきを低減することを目的とする。
【構成】バイパス通路底面部カバーにねじ部を形成し、
バイパス通路にはねじ挿入孔が形成される。バイパス通
路底面部カバー取り付けねじは吸気通路上流側より挿入
され、ねじ脱落の可能性を小さくする。
(57) [Summary] [Object] An object of the present invention is to prevent the bypass passage bottom surface cover mounting screw and the bottom portion cover from falling off by improving the method of mounting the bypass passage bottom surface cover. Another object of the present invention is to reduce variations in the mounting position of the bypass passage bottom cover. [Structure] A screw part is formed on the bottom part of the bypass passage,
A screw insertion hole is formed in the bypass passage. The bypass passage bottom cover mounting screw is inserted from the upstream side of the intake passage to reduce the possibility of the screw falling off.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、自動車用内燃機関にお
ける吸入空気量測定用の空気流量測定装置に係り、特に
空気流量測定用のバイパス通路を主空気通路中に配し
た、発熱抵抗式空気流量測定装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air flow rate measuring device for measuring an intake air amount in an internal combustion engine for an automobile, and more particularly to a heat generating resistance type air having a bypass passage for measuring an air flow rate arranged in a main air passage. The present invention relates to a flow measuring device.
【０００２】[0002]
【従来の技術】従来技術においては、すでに出願されて
いる特開平2−228524 号に記載の様にバイパス通路底面
部カバーは、吸気通路下流側より取り付けられる構造と
なっており、特に考慮はされていない。2. Description of the Related Art In the prior art, as described in Japanese Patent Application Laid-Open No. 2-228524, which has already been filed, the bottom surface of the bypass passage is structured so that it can be attached from the downstream side of the intake passage. Not not.
【０００３】[0003]
【発明が解決しようとする課題】上記従来技術に於いて
は、吸気通路内に設置されたねじの脱落防止については
特に考慮されておらず、取り付けねじが弛んだ時には、
取り付けねじ及び、バイパス通路底面部カバーが吸気通
路内に脱落し、スロットルバルブの戻り不良、または内
燃機関燃焼室，吸排気バルブの破損などの原因となる可
能性があった。In the above-mentioned prior art, no particular consideration is given to preventing the screws installed in the intake passage from falling off.
The mounting screw and the bottom cover of the bypass passage may fall into the intake passage, which may cause a defective return of the throttle valve or damage to the combustion chamber of the internal combustion engine and the intake / exhaust valve.
【０００４】また、上記従来技術に於いては、バイパス
通路底面部カバー位置決めについて、特に考慮されてお
らず、製品毎にカバーの取り付け位置にばらつきが有、
これが空気流量測定装置の出力特性ばらつきの要因とな
っていた。Further, in the above-mentioned prior art, the positioning of the cover on the bottom surface of the bypass passage is not particularly considered, and there are variations in the mounting position of the cover depending on the product.
This has been a cause of variations in the output characteristics of the air flow measuring device.
【０００５】本発明は、バイパス通路底面部カバーの取
り付けねじ及びバイパス通路底面部カバーの脱落防止を
計る事により、信頼性の高い空気流量測定装置を提供す
ることを目的とする。It is an object of the present invention to provide a highly reliable air flow measuring device by measuring the attachment screw of the bottom cover of the bypass passage and the fall prevention of the bottom cover of the bypass passage.
【０００６】また、バイパス通路底面部カバーの取り付
け位置のばらつきを低減することにより、出力特性ばら
つきの少ない空気流量測定装置を提供する事とを目的と
する。Another object of the present invention is to provide an air flow rate measuring device having less variation in output characteristics by reducing variation in the mounting position of the bypass passage bottom cover.
【０００７】[0007]
【課題を解決するための手段】上記目的に於いて、取り
付けねじの脱落防止については、バイパス通路底面部カ
バーにねじ部を形成し、カバー取り付けねじを吸気通路
上流側より挿入することにより解決できる。またさら
に、ねじ取り付け後、ねじの挿入孔にプラグを圧入する
ことにより完全に解決できる。In the above object, the attachment screw can be prevented from falling off by forming a screw portion on the bottom surface of the bypass passage and inserting the cover attachment screw from the upstream side of the intake passage. .. Furthermore, after the screw is attached, the problem can be completely solved by pressing the plug into the insertion hole of the screw.
【０００８】バイパス通路底面部カバーの脱落防止につ
いては、バイパス通路底面部カバーのねじ部に設けられ
た、ねじ部と一体の凸部が、バイパス通路底面の取り付
けねじ挿入部に設けられた、カバー凸部と同一形状の凹
部に圧入される構造とすることにより解決できる。In order to prevent the bypass passage bottom surface cover from falling off, a cover provided with a screw thread portion of the bypass passage bottom surface cover and a convex portion integral with the screw portion is provided at the installation screw insertion portion of the bypass passage bottom surface. The problem can be solved by adopting a structure in which the protrusion is press-fitted into a recess having the same shape.
【０００９】バイパス通路底面部カバー取り付け位置の
ばらつき低減については、バイパス通路底面部カバーの
ねじ部に、ねじ部と一体の凸部を設け、更にカバーの取
り付けバイパス通路底面の取り付けねじ挿入部に、カバ
ー凸部と同一形状の凹部を設けることにより解決でき
る。In order to reduce the variation in the mounting position of the bypass passage bottom surface cover, the screw portion of the bypass passage bottom surface cover is provided with a convex portion integral with the screw portion, and further the mounting screw insertion portion of the cover mounting bypass passage bottom surface is provided. This can be solved by providing a concave portion having the same shape as the cover convex portion.
【００１０】[0010]
【作用】バイパス通路底面部カバー取り付けねじを吸気
通路上流側より挿入することにより、カバー取り付けね
じが弛んだ場合にも、内燃機関の空気吸入圧力により、
バイパス通路に設けられた取り付けねじ挿入孔に、押し
入れられる。この時、バイパス通路底面部とカバーの間
に隙間が発生し、空気流量測定装置の出力特性が変化す
ることにより、内燃機関制御用コントロールユニットに
より、空気流量測定装置の不具合が確認でき、スロット
ルバルブの戻り不良、または内燃機関燃焼室，吸排気バ
ルブの破損などの重大事故を未然に防止できる。[Operation] By inserting the bypass passage bottom cover mounting screw from the upstream side of the intake passage, even if the cover mounting screw is loosened, the air suction pressure of the internal combustion engine
It is pushed into a mounting screw insertion hole provided in the bypass passage. At this time, a gap is generated between the bottom surface of the bypass passage and the cover, and the output characteristics of the air flow rate measurement device change, so that the control unit for controlling the internal combustion engine can confirm the malfunction of the air flow rate measurement device and the throttle valve. It is possible to prevent serious accidents such as a poor return of the internal combustion engine, or damage to the combustion chamber of the internal combustion engine or intake and exhaust valves.
【００１１】上記作用はバイパス通路底面部カバー取り
付け後、バイパス通路の取り付けねじ挿入孔にプラグを
圧入する事により更に確実になる。The above operation can be further assured by pressing the plug into the mounting screw insertion hole of the bypass passage after attaching the bottom cover of the bypass passage.
【００１２】また、バイパス通路底面部カバーのねじ部
に設けられた、ねじ部と一体の凸部が、バイパス通路底
面の取り付けねじ挿入部に設けられた、カバー凸部と同
一形状の凹部に圧入されることにより、取り付けねじが
全て弛んだ場合でも、カバーの脱落を防止できる。Further, the convex portion provided on the screw portion of the bypass passage bottom surface cover and integrated with the screw portion is press-fitted into the concave portion having the same shape as the cover convex portion provided on the mounting screw insertion portion on the bottom surface of the bypass passage. By doing so, even if all the mounting screws are loosened, the cover can be prevented from falling off.
【００１３】また、バイパス通路底面部カバーのねじ部
に設けられた、ねじ部と一体の凸部が、バイパス通路底
面の取り付けねじ挿入部に設けられた、カバー凸部と同
一形状の凹部に挿入されることにより、バイパス通路底
面部カバーの取り付け位置ばらつきが低減できる。Further, the convex portion provided on the screw portion of the bypass passage bottom surface cover and integrated with the screw portion is inserted into the concave portion having the same shape as the cover convex portion provided on the mounting screw insertion portion of the bypass passage bottom surface. By doing so, variation in the mounting position of the bypass passage bottom cover can be reduced.
【００１４】[0014]
【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。自動車の内燃機関の吸気通路の一部を
構成するボディ１の主空気通路５に、空気流量測定用の
バイパス通路６を有し、バイパス通路６中に空気流量測
定用発熱抵抗体２と空気温度測定用感温抵抗体３を有
し、発熱抵抗体２を駆動するモジュール４からなる発熱
抵抗式空気流量測定装置において、バイパス通路６を形
成する部材の一つであるバイパス通路底面部カバー７に
ねじ部を形成し、バイパス通路底面部カバー７の取り付
けねじ８を吸気通路上流側より取り付ける。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be explained. A main air passage 5 of a body 1 forming a part of an intake passage of an internal combustion engine of an automobile has a bypass passage 6 for measuring an air flow rate, and a heat generating resistor 2 for measuring an air flow rate and an air temperature are provided in the bypass passage 6. In a heating resistance type air flow rate measuring device having a temperature sensitive resistor 3 for measurement and a module 4 for driving the heating resistor 2, a bypass passage bottom cover 7 which is one of the members forming the bypass passage 6 is provided. A screw portion is formed, and a mounting screw 8 of the bypass passage bottom surface cover 7 is attached from the upstream side of the intake passage.
【００１５】本実施例によれば、カバー取り付けねじ８
が弛んだ場合、内燃機関の空気吸入圧力により、カバー
取り付けねじ８はカバー取り付けねじ挿入孔９に押し入
れられるため、カバー取り付けねじ８の内燃機関の吸気
通路内への脱落が防止できる。According to this embodiment, the cover mounting screw 8
When the valve is loosened, the cover mounting screw 8 is pushed into the cover mounting screw insertion hole 9 by the air suction pressure of the internal combustion engine, so that the cover mounting screw 8 can be prevented from dropping into the intake passage of the internal combustion engine.
【００１６】図４，図５，図６にカバー取り付けねじ挿
入孔９とバイパス通路底面部カバー７の一実施例を示
す。カバー取り付けねじ挿入孔９の底面側にカバー突起
挿入孔１０を設ける。また、バイパス通路底面部カバー
７のねじ部周囲には、カバー突起挿入孔１０と同一形状
のカバー突起１１を設ける。FIGS. 4, 5 and 6 show an embodiment of the cover mounting screw insertion hole 9 and the bypass passage bottom cover 7. A cover protrusion insertion hole 10 is provided on the bottom surface side of the cover mounting screw insertion hole 9. Further, a cover protrusion 11 having the same shape as the cover protrusion insertion hole 10 is provided around the screw portion of the bypass passage bottom cover 7.
【００１７】本実施例によれば、カバー突起挿入孔１０
とカバー突起１１がかみあうことにより、バイパス通路
底面部カバー７の取り付け位置のばらつきが低減でき
る。According to this embodiment, the cover projection insertion hole 10
By engaging the cover protrusions 11 with each other, it is possible to reduce variations in the mounting position of the bypass passage bottom cover 7.
【００１８】また、カバー突起挿入孔１０にカバー突起
１１が圧入される寸法とすることにより、カバー取り付
けねじ８を締め込むことにより、カバー突起挿入孔１０
にカバー突起１１が圧入され、カバー取り付けねじ８が
弛んだ場合でもバイパス通路底面部カバー７の内燃機関
の吸気通路内への脱落が防止できる。Further, the cover protrusion insertion hole 10 is sized so that the cover protrusion 11 is press-fitted into the cover protrusion insertion hole 10 by tightening the cover mounting screw 8.
Even if the cover protrusion 11 is press-fitted into the cover and the cover mounting screw 8 is loosened, the bypass passage bottom surface cover 7 can be prevented from falling into the intake passage of the internal combustion engine.
【００１９】図７に、バイパス通路底面部カバー７取り
付けねじ部の一実施例を示す。図６に対し、カバー取り
付けねじ８を締め込んだ後、カバー取り付けねじ挿入孔
９にプラグ１２を圧入する。FIG. 7 shows an embodiment of a screw portion for attaching the bypass passage bottom surface cover 7. In contrast to FIG. 6, after the cover mounting screw 8 is tightened, the plug 12 is pressed into the cover mounting screw insertion hole 9.
【００２０】本実施例によれば、カバー取り付けねじ８
の内燃機関の吸気通路内への脱落が完全に防止できる。According to this embodiment, the cover mounting screw 8
Can be completely prevented from falling into the intake passage of the internal combustion engine.
【００２１】[0021]
【発明の効果】本発明によれば、バイパス通路底面部カ
バー取り付けねじ及びバイパス通路底面部カバーの内燃
機関の吸気通路内への脱落が防止できるため、スロット
ルバルブの戻り不良、または内燃機関燃焼室及び吸排気
バルブの破損などの重大事故を未然に防止できる。According to the present invention, the bypass passage bottom cover mounting screw and the bypass passage bottom cover can be prevented from falling into the intake passage of the internal combustion engine. In addition, serious accidents such as damage to the intake and exhaust valves can be prevented.
【００２２】また、本発明によれば、バイパス通路底面
部カバーの取り付け位置ばらつきが低減できるため、出
力特性ばらつきの少ない発熱抵抗式空気流量測定装置を
得ることができる。Further, according to the present invention, since the mounting position variation of the bypass passage bottom surface cover can be reduced, it is possible to obtain the heating resistance type air flow rate measuring device with less variation in output characteristics.
【００２３】以上の効果により、本発熱抵抗式空気流量
測定装置を使用する内燃機関の信頼性及び性能を向上す
ることができる。With the above effects, it is possible to improve the reliability and performance of the internal combustion engine using the present heating resistance type air flow rate measuring device.
【図１】本発明の一実施例の発熱抵抗式空気流量測定装
置のＡ−Ａ断面図である。FIG. 1 is a cross-sectional view taken along the line AA of a heating resistance type air flow rate measuring device according to an embodiment of the present invention.
【図２】本発明の一実施例の発熱抵抗式空気流量測定装
置の上面図である。FIG. 2 is a top view of a heating resistance type air flow rate measuring device according to an embodiment of the present invention.
【図３】本発明の一実施例の発熱抵抗式空気流量測定装
置のバイパス通路底面部カバーねじ止め部断面詳細図で
ある。FIG. 3 is a detailed cross-sectional view of a bypass passage bottom cover screw fastening portion of the heating resistance type air flow rate measuring device according to one embodiment of the present invention.
【図４】本発明の一実施例の発熱抵抗式空気流量測定装
置のバイパス通路ねじ挿入孔部断面詳細図である。FIG. 4 is a detailed cross-sectional view of the bypass passage screw insertion hole portion of the heating resistance type air flow rate measuring device according to the embodiment of the present invention.
【図５】本発明の一実施例の発熱抵抗式空気流量測定装
置のバイパス通路底面部カバーねじ取り付け部断面詳細
図である。FIG. 5 is a detailed cross-sectional view of a bypass passage bottom cover screw mounting portion of the heating resistance type air flow rate measuring device according to the embodiment of the present invention.
【図６】本発明の一実施例の発熱抵抗式空気流量測定装
置のバイパス通路底面部カバーねじ止め部断面詳細図で
ある。FIG. 6 is a detailed cross-sectional view of a bypass passage bottom cover screw fastening portion of the heating resistance type air flow rate measuring device according to one embodiment of the present invention.
【図７】本発明の一実施例の発熱抵抗式空気流量測定装
置のバイパス通路底面部カバーねじ止め部断面詳細図で
ある。FIG. 7 is a detailed cross-sectional view of the bypass passage bottom cover screw fastening portion of the heating resistance type air flow rate measuring device according to the embodiment of the present invention.
１…ボディ、２…発熱抵抗体、３…感温抵抗体、４…モ
ジュール、５…主空気通路、６…バイパス通路、７…バ
イパス通路底面部カバー、８…カバー取り付けねじ、９
…カバー取り付けねじ挿入孔、１０…カバー突起挿入
孔、１１…カバー突起、１２…プラグ。DESCRIPTION OF SYMBOLS 1 ... Body, 2 ... Heating resistor, 3 ... Temperature sensitive resistor, 4 ... Module, 5 ... Main air passage, 6 ... Bypass passage, 7 ... Bypass passage bottom cover, 8 ... Cover mounting screw, 9
... Cover mounting screw insertion hole, 10 ... Cover projection insertion hole, 11 ... Cover projection, 12 ... Plug.
Claims (4)
ボディと、前記ボディ中に設置された空気流量を測定す
るためのバイパス通路と、バイパス通路中に設置された
空気流量測定用発熱抵抗体及び空気温度検出用感温抵抗
体を有し、前記発熱抵抗体の温度を感温抵抗体により測
定した空気温度に対し、一定の温度に加熱すると共に、
該当熱電圧を空気流量に対応した出力電圧信号に変換す
る駆動回路から成る、発熱抵抗式空気流量測定装置に於
いて、前記バイパス通路を形成する部材の一つであるバ
イパス通路底面部カバーに、ねじ部を形成し、通路底面
部カバーの取り付けねじを吸気通路上流側より取り付け
たことを特徴とする発熱抵抗式空気流量測定装置。1. A body forming an intake passage in an intake system of an internal combustion engine, a bypass passage for measuring an air flow rate installed in the body, and an air flow rate heat generating instrument installed in the bypass passage. Having a resistor and a temperature sensitive resistor for air temperature detection, the temperature of the heating resistor is heated to a constant temperature with respect to the air temperature measured by the temperature sensitive resistor,
In a heating resistance type air flow rate measuring device, which comprises a drive circuit for converting the corresponding heat voltage into an output voltage signal corresponding to the air flow rate, in the bypass passage bottom cover which is one of the members forming the bypass passage, A heating resistance type air flow rate measuring device characterized in that a screw portion is formed and a mounting screw for a passage bottom cover is attached from an upstream side of an intake passage.
部と一体の凸部を設け、更にカバーの取り付くバイパス
通路底面の取り付けねじ挿入部に、カバー凸部と同一形
状の凹部を設けたことを特徴とする請求項１記載の発熱
抵抗式空気流量測定装置。2. A convex portion integral with the threaded portion is provided on the screw portion of the bypass passage bottom surface cover, and a recess having the same shape as the cover convex portion is provided at the mounting screw insertion portion on the bottom surface of the bypass passage to which the cover is attached. The heating resistance type air flow rate measuring device according to claim 1.
られた、ねじ部と一体の凸部が、バイパス通路底面の取
り付けねじ挿入部に設けられた、カバー凸部と同一形状
の凹部に圧入されることを特徴とする請求項１又は２記
載の発熱抵抗式空気流量測定装置。3. A convex portion provided on a screw portion of a bypass passage bottom surface cover and integrated with the screw portion is press-fitted into a concave portion having the same shape as the cover convex portion provided on a mounting screw insertion portion of the bypass passage bottom surface. The heating resistance type air flow rate measuring device according to claim 1 or 2, wherein:
イパス通路の取り付けねじ挿入孔にプラグを圧入する事
を特徴とする請求項１，２又は３記載の発熱抵抗式空気
流量測定装置。4. The heating resistance type air flow rate measuring device according to claim 1, wherein a plug is press-fitted into a mounting screw insertion hole of the bypass passage after the bypass passage bottom cover is attached.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4046643A JPH05248904A (en) | 1992-03-04 | 1992-03-04 | Heating resistance type air flow rate measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4046643A JPH05248904A (en) | 1992-03-04 | 1992-03-04 | Heating resistance type air flow rate measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05248904A true JPH05248904A (en) | 1993-09-28 |
Family
ID=12752993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4046643A Pending JPH05248904A (en) | 1992-03-04 | 1992-03-04 | Heating resistance type air flow rate measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05248904A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012052974A (en) * | 2010-09-03 | 2012-03-15 | Hitachi Automotive Systems Ltd | Thermal flow sensor |
-
1992
- 1992-03-04 JP JP4046643A patent/JPH05248904A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012052974A (en) * | 2010-09-03 | 2012-03-15 | Hitachi Automotive Systems Ltd | Thermal flow sensor |
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