JPH0146712B2 - - Google Patents
Info
- Publication number
- JPH0146712B2 JPH0146712B2 JP21202686A JP21202686A JPH0146712B2 JP H0146712 B2 JPH0146712 B2 JP H0146712B2 JP 21202686 A JP21202686 A JP 21202686A JP 21202686 A JP21202686 A JP 21202686A JP H0146712 B2 JPH0146712 B2 JP H0146712B2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- tube
- pressure
- wall thickness
- stainless steel
- 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
- 239000000446 fuel Substances 0.000 claims description 15
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000010935 stainless steel Substances 0.000 claims description 9
- 229910001220 stainless steel Inorganic materials 0.000 claims description 9
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 230000003628 erosive effect Effects 0.000 description 8
- 238000005476 soldering Methods 0.000 description 4
- 238000000137 annealing Methods 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000009661 fatigue test Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 201000001880 Sexual dysfunction Diseases 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010998 test method Methods 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、外径30ｍ／ｍ程度以下で、特に相互
に圧嵌して形成した、外径に対して25乃至40％の
肉厚の、厚肉で細径の内径を有する二重金属管か
らなるデイゼル内燃機関用の高圧燃料噴射管に関
するものである。Detailed Description of the Invention (Industrial Field of Application) The present invention is directed to the invention, which has an outer diameter of about 30 m/m or less, which is formed by press-fitting each other, and which has a wall thickness of 25 to 40% of the outer diameter. This invention relates to a high-pressure fuel injection pipe for a diesel internal combustion engine, which is made of a double metal pipe having a thick wall and a narrow inner diameter.
（従来の技術）
デイゼル内燃機関用高圧燃料噴射管は、その内
部に、一般的に噴射時間約５ミリ秒で流速が最大
で約15ｍ／sec.、内圧200〜600Kg／cm2（ピーク
圧）のような高圧燃料が流れ且つ流速、内圧とも
頻繁且つ急激に変動するものである。近年NOx
の低減や黒煙対策の１つとしての燃料の高圧化の
傾向に伴い、噴射時間１〜２ミリ秒、流速が最大
で50ｍ／sec.、内圧600〜1000Kg／cm2（ピーク圧）
の条件の高圧燃料噴射管が要求されて来た。従つ
て、高圧燃料噴射管には(イ)繰返し高圧力疲労に対
する耐久性、(ロ)耐キヤビテーシヨンエロージヨン
性及び(ハ)エンジンや車体からの振動に対する耐久
性が一層要求されている。(Prior art) A high-pressure fuel injection pipe for a diesel internal combustion engine generally has an injection time of about 5 milliseconds, a maximum flow velocity of about 15 m/sec., and an internal pressure of 200 to 600 Kg/cm 2 (peak pressure). High-pressure fuel flows, and both the flow rate and internal pressure fluctuate frequently and rapidly. In recent years NOx
With the trend toward higher fuel pressure as a measure to reduce smoke and black smoke, injection time is 1 to 2 milliseconds, flow velocity is up to 50 m/sec., and internal pressure is 600 to 1000 Kg/cm 2 (peak pressure).
There has been a demand for high-pressure fuel injection pipes that meet these conditions. Therefore, high-pressure fuel injection pipes are required to have (a) durability against repeated high-pressure fatigue, (b) cavitation erosion resistance, and (c) durability against vibrations from the engine and vehicle body. .
かかる要求のために従来のデイゼル内燃機関用
の高圧燃料噴射管では、外径に対し25乃至40％の
肉厚を有する厚肉の細径鋼管を用い、更にその内
周面に特殊な内削処理を施して焼鈍処理をしたり
（特公昭51−21391号公報）、予め内面又は外面の
全面に銅の鍍金膜を有する複数の高圧配管炭素
鋼々管（STP35）を相互に圧嵌して引抜き加工
等で重合せしめ、その後その当接面全面に介在す
る前記銅鍍金膜を加熱して鑞着した状態に構成し
ていた（特公昭39−328号公報）。 To meet these requirements, conventional high-pressure fuel injection pipes for diesel internal combustion engines use thick-walled, narrow-diameter steel pipes with a wall thickness of 25 to 40% of the outer diameter, and have special internal cutting on the inner circumferential surface. treatment and annealing (Japanese Patent Publication No. 51-21391), or by press-fitting multiple high-pressure piping carbon steel pipes (STP35) with a copper plating film on the entire inner or outer surface in advance. They were made to overlap by drawing or the like, and then the copper plating film interposed over the entire contact surface was heated and soldered (Japanese Patent Publication No. 39-328).
（発明が解決しようとする課題）
しかしながら、前者においては、耐キヤビテー
シヨンエロージヨンや耐繰返し高圧力疲労として
要求される充分な硬度（最大でも280Hv程度）や
焼鈍処理により耐振性が得られず、且つ内削処理
のために特殊な設備を要求されるのみならず、製
造に手間がかかる等の問題があり、又後者の場合
は当接周面に介在する銅鍍金膜を加熱して鑞着す
るが、この鑞着が不充分の場合、相互に圧嵌した
当接周面に緩み現象が発生して間〓を生じ、その
結果内管内を流れる燃料の上記した急激な圧力変
動や温度変化によつて内管が膨張や収縮を繰返す
ため耐繰返し高圧力疲労強度が劣化し易く、且つ
鑞着が充分に行われた時にも鑞着のための加熱に
より母材の軟化があり耐振性に問題を有するもの
であつた。(Problem to be solved by the invention) However, in the former case, vibration resistance cannot be obtained through sufficient hardness (approximately 280 Hv at maximum) required for cavitation erosion resistance and repeated high pressure fatigue resistance, and through annealing treatment. In addition, there are problems such as not only requiring special equipment for internal cutting, but also requiring time and effort to manufacture. However, if the soldering is insufficient, a loosening phenomenon will occur on the abutting surfaces that are press-fitted together, resulting in a gap, and as a result, the above-mentioned rapid pressure fluctuation of the fuel flowing inside the inner pipe and Because the inner tube expands and contracts repeatedly due to temperature changes, its repeated high-pressure fatigue strength tends to deteriorate, and even when soldering is done satisfactorily, the base material softens due to the heating for soldering, making it difficult to withstand vibrations. They had sexual problems.
本発明は、上記問題点に鑑みなされたもので、
耐繰返し高圧力疲労性及び耐キヤビテーシヨンエ
ロージヨンを向上し、又、焼鈍処理を施さないた
め耐振性を改善し、更に密嵌性を高めて内管と外
管との間の間〓をなくし、且つ製造が容易なデイ
ゼル内燃機関用高圧燃料噴射管を提供することを
目的とする。 The present invention was made in view of the above problems, and
It has improved repeated high pressure fatigue resistance and cavitation erosion resistance, and since no annealing treatment is applied, it has improved vibration resistance. It also improves the tight fit between the inner and outer tubes. An object of the present invention is to provide a high-pressure fuel injection pipe for a diesel internal combustion engine that eliminates the problem and is easy to manufacture.
（課題を解決するための手段）
本発明は厚肉で細径の内径を有する金属管から
なるデイゼル内燃機関用の高圧燃料噴射管におい
て、厚肉の鋼管からなる外管に、内側に流通路が
形成されたステンレス鋼管からなる内管を圧嵌し
て二重金属管を形成し、前記ステンレス鋼内管の
肉厚を二重金属管全体の外径に対して1.5乃至8.5
％としたことを特徴とする高圧燃料噴射管を要指
とするものである。(Means for Solving the Problems) The present invention provides a high-pressure fuel injection pipe for a diesel internal combustion engine made of a metal pipe with a thick wall and a small inner diameter. A double metal tube is formed by press-fitting an inner tube made of a stainless steel tube with a thickness formed thereon, and the wall thickness of the stainless steel inner tube is 1.5 to 8.5 with respect to the outer diameter of the entire double metal tube.
The main feature is a high-pressure fuel injection pipe, which is characterized by a %.
（実施例）
第１図は本発明の厚肉で細径の内径を有する二
重金属管の一実施例を示す平面図、第２図は第１
図の一部切欠拡大断面図、第３図は第２図のＡ−
Ａ断面図である。図において、１は外径30ｍ／ｍ
程度以下の比較的厚肉で細径の内径を有する高圧
配管用鋼管で、例えば炭素鋼から形成された外管
であり、２は、その外管１の内側に位置するよう
圧嵌されて流通路３を形成するステンレス鋼々管
の内管であり、その後焼鈍処理を施さない。尚本
発明では特に内管２の肉厚を、外管１とともに形
成される二重金属管全体の外径に対して1.5％乃
至8.8％とするようにしたことを要旨とする。(Example) Fig. 1 is a plan view showing an embodiment of the double metal tube having a thick wall and a small inner diameter according to the present invention, and Fig.
A partially cutaway enlarged sectional view of the figure, Figure 3 is A- of Figure 2.
It is an A sectional view. In the figure, 1 is an outer diameter of 30m/m
A steel pipe for high-pressure piping having a relatively thick wall and a small inner diameter, such as an outer pipe made of, for example, carbon steel. The inner tube of the stainless steel tube forming channel 3 is not subsequently annealed. In particular, the gist of the present invention is that the wall thickness of the inner tube 2 is set to 1.5% to 8.8% of the outer diameter of the entire double metal tube formed together with the outer tube 1.
このように、本発明で特にステンレス鋼々管か
らなる内管を、前記肉厚の範囲にした理由は、肉
厚が1.5％未満では、二重金属管の最終工程にお
ける矯正加工時に、流通路３の内壁に波面状の不
規則な変形（うねり）を生じて流過抵抗を増し、
キヤビテーシヨンエロージヨンを発生させ、又、
肉厚が8.5％を越えると当接周面に対する全体の
緩み現象が生じて間〓が発生し、流通する高圧燃
料の急激な圧力変動等により内管が短期間に破損
するからである。 Thus, in the present invention, the reason why the inner tube made of stainless steel tubes is made to have the above-mentioned wall thickness is that if the wall thickness is less than 1.5%, the flow path 3 This causes irregular wave-like deformation (undulations) on the inner wall of the pipe, increasing flow resistance.
causing cavitation erosion, and
This is because if the wall thickness exceeds 8.5%, a phenomenon of overall loosening against the abutting peripheral surface will occur, causing a gap, and the inner pipe will be damaged in a short period of time due to rapid pressure fluctuations of the high-pressure fuel flowing.
即ち、本出願人は、STS 35に相当する、外径
6.4mm、肉厚２mmの外管とSUS 304（Hv 350）の、
肉厚0.5mmの内管を用い、二重管全体の外径に対
する内管の肉厚比率と、内管と外管の最大間〓及
び内管の内周面の最大変形（うねり）との関係を
調べ、その結果を夫々第４図、第５図に示す。第
４図及び第５図では、最終工程としての二重管の
矯正加工後の仕上り状態を横断面における顕微鏡
で観察した。その結果夫々8.5％及び1.5％を境と
して、8.5％を越えると、矯正加工による外管側
の軸芯方向への塑性変形にに伴つて内管と外管と
の間に間〓を急激に発生する傾向となり、又、
1.5％未満では内管の流通路の内壁表面に矯正加
工時のロール転跡に伴う波面状の不規則な変形
（うねり）が急激に生ずる傾向となることが分つ
た。従つて、本発明では二重金属管全体の外径に
対するステンレス鋼内管の肉厚比率1.5％乃至8.5
％とした。 That is, the applicant has determined that the outer diameter corresponds to STS 35.
6.4mm, wall thickness 2mm outer tube and SUS 304 (Hv 350),
Using an inner tube with a wall thickness of 0.5 mm, calculate the ratio of the inner tube's wall thickness to the outer diameter of the entire double tube, the maximum distance between the inner tube and the outer tube, and the maximum deformation (waviness) of the inner peripheral surface of the inner tube. The relationship was investigated and the results are shown in FIGS. 4 and 5, respectively. In FIGS. 4 and 5, the finished state of the double tube after straightening as the final step was observed using a microscope in cross section. As a result, the boundaries are 8.5% and 1.5%, respectively, and when it exceeds 8.5%, the gap between the inner and outer tubes suddenly increases due to plastic deformation in the axial direction of the outer tube due to straightening. It tends to occur, and
It was found that when the content is less than 1.5%, irregular wave-like deformations (undulations) due to roll traces during straightening tend to occur rapidly on the inner wall surface of the flow path of the inner tube. Therefore, in the present invention, the wall thickness ratio of the stainless steel inner tube to the outer diameter of the entire double metal tube is 1.5% to 8.5%.
%.
尚、上記した外径と肉厚を有する焼鈍した
STS35からなる一重管の噴射管（従来品）にお
いて最大0.6mmのキヤビテーシヨンエロージヨン
を生ずるような管内圧力波形に噴射条件を設定し
たキヤビテーシヨンエロージヨン促進試験を行つ
た場合本発明の燃料噴射管内壁表面にはキヤビテ
ーシヨンエロージヨンの発生は皆無であり、又耐
繰返し高圧力疲労特性は従来品に比べ2.5倍、更
にJASOM104「ブレーキチユーブ試験方法」の
「5.8曲げ疲れ試験」を援用した曲げ疲労試験では
耐振性は17％向上した。 In addition, an annealed product having the outer diameter and wall thickness described above.
A cavitation erosion acceleration test was conducted in which the injection conditions were set to an internal pressure waveform that caused cavitation erosion of up to 0.6 mm in a single-tube injection tube (conventional product) made of STS35. There is no cavitation erosion on the inner wall surface of the fuel injection pipe, and the repeated high-pressure fatigue resistance is 2.5 times that of conventional products, and it has also passed the 5.8 bending fatigue test of JASOM104 "Brake tube test method". In a bending fatigue test using the same technology, vibration resistance improved by 17%.
（発明の効果）
以上詳細に説明したように、本発明によれば、
二重金属管の当接周面での鑞着を不要とし、引抜
き加工による圧嵌で相互の密嵌性を極めて良好に
し相互の当接周面での緩み現象を防止でき、且つ
内管にステンレス鋼々管を用いたため、内部流圧
に対する耐繰返し高圧力疲労を向上せしめると共
に、流通路壁での流過抵抗に伴うキヤビテーシヨ
ンエロージヨンの防止、軽減を計り、更に耐振性
も向上することもできたものである。(Effects of the Invention) As explained in detail above, according to the present invention,
It eliminates the need for soldering on the abutting periphery of the double metal tubes, and achieves extremely good mutual tight fitting through pressure fitting by drawing process, preventing loosening phenomena on the mutual abutting periphery.In addition, the inner tube is made of stainless steel. The use of steel pipes improves repeated high-pressure fatigue resistance against internal flow pressure, prevents and reduces cavitation erosion caused by flow resistance on the walls of the flow passage, and also improves vibration resistance. It could have been done.
第１図は本発明の厚肉で細径の内径を有する二
重金属管の一実施例を示す平面図、第２図は第１
図の一部切欠拡大断面図、第３図は第２図のＡ−
Ａ断面図、第４図は二重管全体の外径に対する内
管肉厚の比率と内管及び外管の間〓との関係を示
すグラフ、第５図は二重管全体の外径に対する内
管の肉厚比率と内管内周面の変形（うねり）の関
係を示すグラフである。
１……外管、２……内管、３……流通路。
FIG. 1 is a plan view showing an embodiment of the double metal tube having a thick wall and a small inner diameter according to the present invention, and FIG.
A partially cutaway enlarged sectional view of the figure, Figure 3 is A- of Figure 2.
A sectional view, Figure 4 is a graph showing the relationship between the ratio of the inner tube wall thickness to the outer diameter of the entire double tube and the distance between the inner tube and outer tube, and Figure 5 is the graph showing the relationship between the ratio of the inner tube wall thickness to the outer diameter of the entire double tube. It is a graph showing the relationship between the wall thickness ratio of the inner tube and the deformation (undulation) of the inner circumferential surface of the inner tube. 1... Outer pipe, 2... Inner pipe, 3... Distribution path.
Claims (1)
イゼル内燃機関用の高圧燃料噴射管において、厚
肉の鋼管からなる外管に、内側に流通路が形成さ
れたステンレス鋼管からなる内管を圧嵌して二重
金属管を形成し、前記ステンレス鋼内管の肉厚を
二重金属管全体の外径に対して1.5乃至8.5％とし
たことを特徴とする高圧燃料噴射管。1. In a high-pressure fuel injection pipe for a diesel internal combustion engine, which is made of a metal pipe with a thick wall and a small inner diameter, the outer pipe is made of a thick-walled steel pipe, and the inner pipe is made of a stainless steel pipe with a flow passage formed inside. A high-pressure fuel injection pipe characterized in that the stainless steel inner pipe is press-fitted to form a double metal pipe, and the wall thickness of the stainless steel inner pipe is 1.5 to 8.5% of the outer diameter of the entire double metal pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21202686A JPS62184291A (en) | 1986-09-09 | 1986-09-09 | Double metallic pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21202686A JPS62184291A (en) | 1986-09-09 | 1986-09-09 | Double metallic pipe |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21327388A Division JPH01100364A (en) | 1988-08-27 | 1988-08-27 | High pressure fuel injection pipe for diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62184291A JPS62184291A (en) | 1987-08-12 |
| JPH0146712B2 true JPH0146712B2 (en) | 1989-10-11 |
Family
ID=16615639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21202686A Granted JPS62184291A (en) | 1986-09-09 | 1986-09-09 | Double metallic pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62184291A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19808012A1 (en) * | 1997-02-26 | 1998-08-27 | Usui Kokusai Sangyo Kk | High pressure fuel injection pipe and process for its manufacture |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2796551B2 (en) * | 1989-02-07 | 1998-09-10 | 臼井国際産業株式会社 | Thick and small-diameter fuel injection pipe and method of manufacturing the same |
-
1986
- 1986-09-09 JP JP21202686A patent/JPS62184291A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19808012A1 (en) * | 1997-02-26 | 1998-08-27 | Usui Kokusai Sangyo Kk | High pressure fuel injection pipe and process for its manufacture |
| DE19808012C2 (en) * | 1997-02-26 | 2001-02-01 | Usui Kokusai Sangyo Kk | High pressure fuel injection pipe and process for its manufacture |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62184291A (en) | 1987-08-12 |
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