JP2520075B2 - Connection head structure of high-pressure fuel injection pipe - Google Patents
Connection head structure of high-pressure fuel injection pipeInfo
- Publication number
- JP2520075B2 JP2520075B2 JP4241263A JP24126392A JP2520075B2 JP 2520075 B2 JP2520075 B2 JP 2520075B2 JP 4241263 A JP4241263 A JP 4241263A JP 24126392 A JP24126392 A JP 24126392A JP 2520075 B2 JP2520075 B2 JP 2520075B2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- wall portion
- connection head
- fuel injection
- pressure receiving
- 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
Landscapes
- Fuel-Injection Apparatus (AREA)
- Joints With Pressure Members (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はディーゼル内燃機関にお
ける燃料の供給路に配設し、使用される管外径が２０ｍ
／ｍ程度以下で、内径が１．２ｍ／ｍ乃至４ｍ／ｍ程度
の比較的厚肉細径の高圧燃料噴射管の接続頭部構造に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is arranged in a fuel supply passage in a diesel internal combustion engine and has a pipe outer diameter of 20 m.
/ M or less and an inner diameter of 1.2 m / m to 4 m / m and a relatively thick and small diameter high pressure fuel injection pipe connecting head structure.
【０００２】[0002]
【従来の技術】従来におけるこの種管端の接続頭部構造
としては、図２（ａ）に示すように、厚肉細径金属管１
１の接続端部に、前面の外周側を押圧壁管１３とし、ま
た背面の外周側を受圧壁部１４として形成した算盤珠状
の接続頭部１２において、受圧壁部１４は頂部から首下
部へ急斜面１４′によって形成していた。また、図２
(ｂ）に示すように、前記首下部附近を含む受圧壁部１
４に締付けナット１６と係合するスリーブワッシャー１
７を当接嵌挿せしめた状態で構成されていた。2. Description of the Related Art As a conventional connecting head structure for this kind of pipe end, as shown in FIG.
In the connecting head 12 of the abacus shape in which the outer peripheral side of the front surface is the pressure wall tube 13 and the outer peripheral side of the rear surface is the pressure receiving wall portion 14 at the connecting end portion of 1, the pressure receiving wall portion 14 is from the top to the lower neck. It was formed by a steep slope 14 '. FIG.
As shown in (b), the pressure receiving wall 1 including the vicinity of the lower neck.
4, the sleeve washer 1 engaging the tightening nut 16
7 was abutted and inserted.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記構
成の接続頭部構造では、受圧壁部１４を一定の急斜面１
４′としたのみの構造であるため、接続頭部１２の首下
部附近における機械的強度が充分でなく、使用中に機関
振動による加振或いは製品としての曲げ形状が不具合な
ときの無理な接続等によって、しばしば首下部附近に亀
裂または折損が生じる等の問題点があり、またスリーブ
ワッシャー１７を当接嵌挿したものにおいてもなお、前
記と同様な問題点があった。However, in the connecting head structure having the above structure, the pressure receiving wall portion 14 is provided with a constant steep surface 1.
Since the structure is only 4 ', the mechanical strength in the vicinity of the lower part of the neck of the connection head 12 is not sufficient, and an unreasonable connection when vibration due to engine vibration during use or the bending shape as a product is defective. Therefore, there is a problem that a crack or a breakage is often generated in the vicinity of the lower part of the neck, and the one in which the sleeve washer 17 is abutted and fitted still has the same problem as described above.
【０００４】かかる問題を解決するため、本出願人は接
続頭部の受圧面の急斜面に連なり緩斜面を一体に設けた
高圧燃料噴射管を実開昭５７−１５６０７４号として提
案した。この提案は、首下部付近の機械的強度の増大に
はある程度効果があることが認められたが、その後この
ような構成をとっても特定範囲ではかえって疲労応力の
分散ができなかったり応力の集中がみられ、更なる改善
が求められていた。本発明者は、このような要望に基づ
き検討、実験した結果、前記緩斜面の傾斜角度及び長さ
をある範囲とすれば、上記の問題を生ずるおそれがな
く、効果的に疲労応力の集中を分散できることを見出し
本発明を完成するに至った。従って、本発明は上記した
従来技術のみならず、本出願人による上記提案の問題点
を解決した高圧燃料噴射管の接続頭部構造を提供するこ
とを目的とするものである。In order to solve such a problem, the applicant of the present invention has proposed a high-pressure fuel injection pipe, which is continuous with the steep slope of the pressure receiving surface of the connecting head and integrally provided with a gentle slope, as Japanese Utility Model Publication No. 57-156074. This proposal was found to be effective to some extent in increasing the mechanical strength in the vicinity of the lower neck, but even with this configuration, fatigue stress could not be dispersed or stress concentration could be observed in a specific range. Therefore, further improvement was required. The present inventor, based on such a request, as a result of an experiment, as a result, if the inclination angle and the length of the gentle slope are within a certain range, there is no possibility of causing the above problem, and the concentration of fatigue stress is effectively reduced. They have found that they can be dispersed and have completed the present invention. Therefore, it is an object of the present invention to provide not only the above-mentioned conventional technique but also a connection head structure for a high-pressure fuel injection pipe which solves the problems of the above-mentioned proposal by the present applicant.
【０００５】[0005]
【課題を解決するための手段】本発明は、前面の外周側
を相手接続座面への押圧壁部とし、且つ背面の外周側を
締付けたナットと係合する受圧壁部となす厚肉細径から
なる金属管の接続端部に膨出成型した算盤珠状からなる
接続頭部において、前記接続頭部のなす押圧壁部と略等
しい角度を有する受圧壁部側の頂部からの急斜面に連な
るその裾部を、管軸に対して２°乃至５°の範囲にある
傾斜角度を有し且つその長さが略管径以上である緩斜面
となして一体に連設して構成してなることを要旨とする
ものである。SUMMARY OF THE INVENTION According to the present invention, the front and outer peripheral sides are a pressing wall portion against a mating connection seat surface, and the rear outer peripheral side is a pressure receiving wall portion that engages with a tightened nut. In a connecting head made of abacus beads that is bulged and molded at the connecting end of a metal tube of diameter, it is connected to a steep slope from the top on the pressure receiving wall side that has an angle substantially equal to the pressing wall made by the connecting head. The skirt portion is integrally connected so as to form a gentle slope having an inclination angle within the range of 2 ° to 5 ° with respect to the pipe axis and having a length substantially equal to or larger than the pipe diameter. This is the summary.
【０００６】[0006]
【作用】本発明では、接続頭部において押圧壁部と略等
しい角度を有する受圧壁部を、頂部からの急斜面に形成
すると共に、その裾部に管軸に対して傾斜角度が２°乃
至５°の範囲で、長さが管径以上を有する緩斜面を連設
して構成したため、接続頭部を同時成型でき製造が容易
となり、且つ使用中の加振状態や無理な取付け状態下に
あっても首下部附近にかかる疲労応力を分散させること
ができ、更にスリーブワッシャーの使用を不要として製
品の軽量化を計れ、また製造作業を簡単にすることがで
きる。In the present invention, the pressure receiving wall portion having an angle substantially equal to that of the pressing wall portion is formed on the connection head on the steep slope from the top, and the skirt has an inclination angle of 2 ° to 5 ° with respect to the pipe axis. In the range of °, a gentle slope with a length equal to or larger than the pipe diameter is connected in series, so that the connection head can be molded simultaneously, which facilitates manufacturing, and is in a vibrating state during use or under an excessive mounting state. However, it is possible to disperse the fatigue stress applied to the vicinity of the lower part of the neck, and it is possible to reduce the weight of the product without using a sleeve washer and to simplify the manufacturing work.
【０００７】[0007]
【実施例】以下本発明の一実施例を図面により詳細に説
明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.
【０００８】図１は本発明接続頭部構造の一実施例を示
す一部切欠き側面図を示す。図において、１は内径が約
１．２ｍ／ｍ乃至４ｍ／ｍ、外径が約２０ｍ／ｍ以下の
比較的厚肉細径からなる金属管で、２はこの金属管１の
端部に設けられ、前面の外周側には相手接続座面に当接
する押圧壁部３と背面の外周側には予め金属管１に組込
んだ締付けナット６と係合する受圧壁部４とを膨出成型
せしめ且つ押圧壁部と受圧壁部との角度を略等しく形成
した算盤珠状の接続頭部である。本発明では押圧壁部３
と同様に受圧壁部４は頂部から急斜面４′で形成し、続
いて、その裾部に後方に延びる緩斜面４″を一体に連設
せしめたもので、同時成型が可能であり、この成型の際
に緩斜面４″は管軸に対して傾斜角度θを２°〜５°の
範囲に、また長さｌを略管径以上の長さを有するよう構
成せしめる。なお前記の緩斜面４″の傾斜角度を２°〜
５°に限定した理由は、傾斜角度θが２°未満では管の
振動等による疲労応力を効果的に分散することができ
ず、一方５°を越えると緩斜面４″と管径面との接点５
において応力の集中が生じ易くなるからである。更に緩
斜面４″の長さｌが管径寸法未満では応力の分散効果が
みられなくなるからである。FIG. 1 is a partially cutaway side view showing an embodiment of the connecting head structure of the present invention. In the figure, 1 is a metal tube having an inner diameter of about 1.2 m / m to 4 m / m and an outer diameter of about 20 m / m or less, which is a relatively thick and thin metal tube, and 2 is provided at the end of the metal tube 1. On the outer peripheral side of the front surface, a pressing wall portion 3 abutting against the mating connection seating surface and on the outer peripheral side of the rear surface a pressure receiving wall portion 4 engaging with a tightening nut 6 previously assembled in the metal tube 1 are bulging-molded. It is a connecting head having an abacus shape in which the angle between the pressing wall portion and the pressure receiving wall portion is substantially equalized. In the present invention, the pressing wall portion 3
Similarly to the above, the pressure receiving wall portion 4 is formed by a steep slope 4'from the top, and subsequently, a gentle slope 4 "extending rearward is integrally connected to the hem of the pressure slope 4'in order to enable simultaneous molding. In this case, the gentle slope 4 ″ is configured such that the inclination angle θ with respect to the tube axis is in the range of 2 ° to 5 ° and the length 1 is approximately equal to or larger than the tube diameter. The inclination angle of the gentle slope 4 ″ is 2 ° to
The reason for limiting the angle to 5 ° is that if the inclination angle θ is less than 2 °, the fatigue stress due to the vibration of the pipe cannot be effectively dispersed, while if it exceeds 5 °, the gentle slope 4 ″ and the pipe diameter surface are Contact 5
This is because stress concentration is likely to occur at. Further, if the length l of the gentle slope 4 ″ is less than the diameter of the pipe, the stress dispersion effect cannot be seen.
【０００９】次に、実験による結果を表１に示す。Next, Table 1 shows the results of the experiment.
【００１０】表は材質ＳＴＳ−３５を完全焼鈍処理した
外径６ｍ／ｍ、内径２ｍ／ｍの前記緩斜面４″の角度θ
及び長さｌを変えて成型した高圧燃料噴射管の疲労試験
結果であり、応力を一定として疲労破断までの繰返し振
動数を示したものである。この試験結果によってもわか
るように、緩斜面の傾斜角度θが２°〜５°で、長さｌ
が略管径以上のものが、耐疲労応力に優れていることが
明らかである。The table shows the angle θ of the gentle slope 4 "having an outer diameter of 6 m / m and an inner diameter of 2 m / m obtained by completely annealing the material STS-35.
And the fatigue test results of the high-pressure fuel injection pipes molded by changing the length l, and showing the repeated frequency until fatigue fracture with constant stress. As can be seen from the results of this test, the inclination angle θ of the gentle slope is 2 ° to 5 ° and the length l
It is clear that those having a diameter of approximately equal to or larger than the pipe diameter are excellent in fatigue stress resistance.
【００１１】[0011]
【表１】 [Table 1]
【００１２】[0012]
【発明の効果】以上詳細に説明したように、本発明は接
続頭部の押圧壁部と略等しい角度を有する受圧壁部を頂
部からの急斜面と、更にその裾部に傾斜角度が２°乃至
５°の範囲で、長さｌが略管径以上を有する緩斜面とを
連設構成するよう同時成型せしめるので、首下部附近の
断面係数の変化が緩やかとなり、したがって簡易に製造
できると共に、使用中の加振状態、或いは曲げ形状が不
具合なときの無理な取付け状態下等でも首下部附近にか
かる疲労応力の集中を効果的に分散させることができ、
そのためこの部分附近から生ずる亀裂や折損を著しく軽
減若しくは防止することができる。更に従来例における
スリーブワッシャーの使用を不要とするため製品の軽量
化及び製造作業を簡単にする等の効果がある。As described in detail above, according to the present invention, the pressure receiving wall portion having a substantially equal angle to the pressing wall portion of the connection head is formed into a steep slope from the top, and further, the inclination angle is 2 ° to the hem. In the range of 5 °, since the length 1 is formed simultaneously with a gentle slope having a pipe diameter of not less than about the pipe diameter, the change of the section modulus near the lower part of the neck becomes gentle, so that it can be easily manufactured and used. It is possible to effectively disperse the concentration of fatigue stress applied to the vicinity of the bottom of the neck even in the case of vibrating inside, or in the unreasonable mounting state when the bending shape is defective,
Therefore, it is possible to significantly reduce or prevent cracks and breakages that occur near this part. Further, since it is unnecessary to use the sleeve washer in the conventional example, there are effects such as weight reduction of the product and simplification of manufacturing work.
【図１】本発明接続頭部構造の一実施例を示す一部切欠
き側面図である。FIG. 1 is a partially cutaway side view showing an embodiment of a connection head structure of the present invention.
【図２】従来の接続頭部構造を示すもので、（ａ）は従
来の１例を示す一部切欠き側面図、（ｂ）は従来の他の
例を示す一部切欠き側面図である。2A and 2B show a conventional connecting head structure, in which FIG. 2A is a partially cutaway side view showing a conventional example, and FIG. 2B is a partially cutaway side view showing another conventional example. is there.
１ 金属管 ２ 接続頭部 ３ 押圧壁部 ４ 受圧壁部 ４′ 急斜面 ４″ 緩斜面 ５ 接点 ６ 締付けナット 1 Metal Pipe 2 Connection Head 3 Pressing Wall 4 Pressure-Receiving Wall 4'Steep Slope 4 "Slow Slope 5 Contact 6 Tightening Nut
Claims (1)
部とし、且つ背面の外周側を締付けたナットと係合する
受圧壁部となす厚肉細径からなる金属管の接続端部に膨
出成型した算盤珠状からなる接続頭部において、前記接
続頭部（２）のなす押圧壁部（３）と略等しい角度を有
する受圧壁部（４）側の頂部からの急斜面（４′）に連
なるその裾部を、管軸に対して２°乃至５°の範囲にあ
る傾斜角度（θ）を有し且つその長さ（ｌ）が略管径以
上である緩斜面（４″）となして一体に連設して構成し
たことを特徴とする高圧燃料噴射管の接続頭部構造。1. A connecting end of a metal pipe having a thick and thin diameter, the outer peripheral side of the front surface being a pressing wall portion against the mating connection seating surface, and the outer peripheral side of the rear surface being a pressure receiving wall portion engaging with a tightened nut. In the connection head formed of an abacus bead-shaped in a bulge shape, the steep slope from the top on the pressure receiving wall (4) side having an angle substantially equal to that of the pressing wall (3) formed by the connection head (2) ( 4 ') has a skirt with a sloping surface (4) having an inclination angle (θ) in the range of 2 ° to 5 ° with respect to the pipe axis and a length (l) of approximately the pipe diameter or more. ″), The high pressure fuel injection pipe connecting head structure is characterized in that it is integrally connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4241263A JP2520075B2 (en) | 1992-08-18 | 1992-08-18 | Connection head structure of high-pressure fuel injection pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4241263A JP2520075B2 (en) | 1992-08-18 | 1992-08-18 | Connection head structure of high-pressure fuel injection pipe |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29854989A Division JPH02163590A (en) | 1989-11-16 | 1989-11-16 | Connecting head part structure of high pressure fuel injection pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05306789A JPH05306789A (en) | 1993-11-19 |
| JP2520075B2 true JP2520075B2 (en) | 1996-07-31 |
Family
ID=17071654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4241263A Expired - Fee Related JP2520075B2 (en) | 1992-08-18 | 1992-08-18 | Connection head structure of high-pressure fuel injection pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2520075B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102374973B1 (en) * | 2021-09-13 | 2022-03-16 | 주식회사 화영 | Manufacturing method of high pressure pipe |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57156074U (en) * | 1981-03-26 | 1982-09-30 |
-
1992
- 1992-08-18 JP JP4241263A patent/JP2520075B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05306789A (en) | 1993-11-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |