JP2011149282A - Seal pin of fuel injection pipe for high pressure - Google Patents

Seal pin of fuel injection pipe for high pressure Download PDF

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Publication number
JP2011149282A
JP2011149282A JP2010008943A JP2010008943A JP2011149282A JP 2011149282 A JP2011149282 A JP 2011149282A JP 2010008943 A JP2010008943 A JP 2010008943A JP 2010008943 A JP2010008943 A JP 2010008943A JP 2011149282 A JP2011149282 A JP 2011149282A
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Japan
Prior art keywords
seal pin
outer peripheral
fuel injection
pressure
seal
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JP2010008943A
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JP5340184B2 (en
Inventor
Harumi Kato
春美 加藤
Kenichi Niinuma
賢一 新沼
Koichi Kobayashi
幸一 小林
Kazuki Takagi
一樹 高木
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Denso Corp
Daishin Seiki KK
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Denso Corp
Daishin Seiki KK
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Priority to JP2010008943A priority Critical patent/JP5340184B2/en
Priority to DE201110000121 priority patent/DE102011000121A1/en
Priority to FR1150294A priority patent/FR2955273B1/en
Priority to CN 201110021595 priority patent/CN102128333B/en
Publication of JP2011149282A publication Critical patent/JP2011149282A/en
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    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/166—Selection of particular materials
    • 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
    • F02M55/004—Joints; Sealings
    • 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
    • F02M55/025—Common rails

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seal pin sealing a piping port of a fuel injection pipe for high pressure so that auto-frettage processing is implemented on the fuel injection pipe for high pressure under an ultrahigh pressure. <P>SOLUTION: The seal pin 20 includes: a groove hole 22 disposed at an axial center part of a seal pin end part inserted into the pipe hole 23, and having a bottom part 22'; and a seal pin end part outer peripheral part 25 in contact with a tapered part 23' inside the pipe hole 23. The seal pin end part outer peripheral part 25 is deformed in an elastic area by internal pressure of ultrahigh pressure, and is brought into contact with the tapered part 23'. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、超高圧下で高圧燃料噴射管にオートフレッテージ加工を行うために、該高圧燃料噴射管の配管口内側のテーパ部をシールするためのシールピンに関する。   The present invention relates to a seal pin for sealing a taper portion inside a piping port of a high-pressure fuel injection pipe in order to perform autofrettage processing on the high-pressure fuel injection pipe under an ultra-high pressure.

従来、特許文献１、２等にみられるように、高圧燃料噴射管に対して恒久的に疲労破壊を防止する手法、つまり、密閉状態で高圧をかけて材料組織に残留応力を残して強度をあげる手法（オートフレッテージ加工と称す）が知られている。ディーゼル用燃料システムの設定圧の上昇に伴い、オートフレッテージ加工における内圧も高圧化してきている。特に、８００Ｍｐａ以上の内圧をかける際には、配管口への漏れ防止をする必要があり、市販のシールキャップではシール耐圧が低すぎて漏れてしまうことになり、シールとして使用することができなかった。   Conventionally, as seen in Patent Documents 1 and 2, etc., a technique for permanently preventing fatigue failure of a high-pressure fuel injection pipe, that is, by applying high pressure in a sealed state and leaving residual stress in the material structure, A technique (referred to as auto-frettage processing) is known. As the set pressure of the diesel fuel system increases, the internal pressure in autofrettage processing has also increased. In particular, when applying an internal pressure of 800 Mpa or more, it is necessary to prevent leakage to the piping port. With a commercially available seal cap, the seal pressure resistance is too low to leak and cannot be used as a seal. It was.

特許文献１においては、ワークの開口部に対して、切頭円錐形状の密封端部を油圧シリンダで圧力をかけて、密封端部でシールしている。これによって、密封端部がワークの開口部を密閉させる力が、内圧に比例して増加させることができるようにしている。このような方式のシールを用いると、内圧とのバランス合せのために油圧シリンダの圧力制御が複雑であり、油圧ポンプや高速弁などの付帯装置も必要となり、コスト高となってしまっていた。また、このような方式で自動化にした場合、ワーク搬送はパレット式になるため、パレット設備の費用が嵩むこととなる。さらに、ワーク品番が限定されておらず、ワークの開口部の位置が、常に定位置でない場合には、自動化にしたときに開口部の位置と密封端部との接続が非常に難しく、品番切替えのセッティングに問題が生じていた。   In Patent Document 1, a truncated cone-shaped sealed end is applied to the opening of the workpiece by a hydraulic cylinder and sealed with the sealed end. As a result, the force with which the sealing end seals the opening of the workpiece can be increased in proportion to the internal pressure. When such a seal is used, the pressure control of the hydraulic cylinder is complicated for balancing with the internal pressure, and additional devices such as a hydraulic pump and a high-speed valve are required, resulting in high costs. Moreover, when it automates by such a system, since a workpiece conveyance will be a pallet type, the expense of a pallet installation will increase. In addition, if the workpiece part number is not limited and the position of the workpiece opening is not always fixed, it is very difficult to connect the opening to the sealed end when automation is performed. There was a problem with the setting.

独国特許発明第１０２００６０５４４４０号明細書（ＤＥ１０２００６０５４４４０Ｂ３）German Patent No. 102006054440 (DE102006054440B3) 特開２００４−９２５５１号公報JP 2004-92551 A

本発明は、上記問題に鑑み、超高圧下で高圧燃料噴射管にオートフレッテージ加工を行うために、該高圧燃料噴射管の配管口内側のテーパ部をシールするためのシールピンを提供するものである。   In view of the above problems, the present invention provides a seal pin for sealing a taper portion inside a piping port of a high-pressure fuel injection pipe in order to perform autofrettage processing on the high-pressure fuel injection pipe under ultra high pressure. is there.

上記課題を解決するために、請求項１の発明は、超高圧下で高圧燃料噴射管にオートフレッテージ加工を行うために、該高圧燃料噴射管の配管口（２３）をシールするためのシールピン（２０）であって、該シールピン（２０）は、前記配管口（２３）に挿入するシールピン端部の軸心部に設けられた、底部（２２'）を有する溝穴（２２）と、前記配管口（２３）の内側のテーパ部（２３’）に接触する、シールピン端部外周部（２５）と、を具備しており、前記テーパ部（２３’）に対して、前記シールピン端部外周部（２５）が、超高圧の内圧によって弾性領域で変形して、接触するように構成されたシールピンである。   In order to solve the above-mentioned problems, the invention of claim 1 is directed to a seal pin for sealing the piping port (23) of the high-pressure fuel injection pipe in order to perform auto-frettage processing on the high-pressure fuel injection pipe under ultra high pressure. (20), wherein the seal pin (20) includes a slot (22) having a bottom portion (22 ′) provided in an axial center portion of a seal pin end portion to be inserted into the piping port (23), A seal pin end outer peripheral portion (25) that contacts a taper portion (23 ') inside the piping port (23), and the seal pin end outer periphery with respect to the taper portion (23'). The part (25) is a seal pin configured to be deformed and contacted in an elastic region by an ultra-high internal pressure.

これにより、オートフレッテージ加工における超高圧においても、配管口への漏れ防止を行うことができ、内圧とのバランス合せのために油圧シリンダの圧力制御や、油圧ポンプや高速弁などの付帯装置を不要とすることができる。特に、シールピン端部の軸心部に設けられた溝穴に内圧がかかるので、テーパ部に対して、シールピン端部外周部が、超高圧の内圧によって弾性領域で変形して、高いシール耐圧を持って密着するようになされている。   As a result, leakage to the piping port can be prevented even at ultra-high pressures in autofrettage processing, and hydraulic cylinder pressure control and auxiliary devices such as hydraulic pumps and high-speed valves are provided for balancing with internal pressure. It can be unnecessary. In particular, since the internal pressure is applied to the slot provided in the shaft center portion of the seal pin end, the outer peripheral portion of the seal pin end is deformed in the elastic region by the ultrahigh internal pressure with respect to the taper portion, so that a high seal pressure resistance is achieved. It is designed to be in close contact.

請求項２の発明は、請求項１の発明において、前記シールピン端部外周部（２５）が、断面円弧状であることを特徴とする。これにより、接触部から漏れの無い面圧を確保することができる。   The invention of claim 2 is characterized in that, in the invention of claim 1, the seal pin end outer peripheral portion (25) has an arcuate cross section. Thereby, the surface pressure without a leak from a contact part is securable.

請求項３の発明は、請求項１又は２の発明において、前記溝穴（２２）の前記底部（２２’）のコーナーに、Ｒ部が設けられているか、又は、前記底部（２２'）が球面であることを特徴とする。これにより、発生応力を極力抑え、疲労破壊しない材料の耐圧強度をアップすることができる。   The invention of claim 3 is the invention of claim 1 or 2, wherein an R portion is provided at a corner of the bottom portion (22 ') of the slot (22) or the bottom portion (22') is provided. It is characterized by being spherical. Thereby, the generated stress can be suppressed as much as possible, and the pressure resistance strength of the material that does not undergo fatigue failure can be increased.

請求項４の発明は、請求項１から３のいずれか１項記載の発明において、前記内圧の最大値が８００Ｍｐａ以上でオートフレッテージ加工を行う場合において、前記テーパ部内径（Ｄ１）を１としたときに、前記シールピンの形状寸法は、シールピン外周部（２６）の外径（Ｄ２）が約１．０８、かつ、溝穴内径（ｄ）が約０．７、かつ、溝穴深さ（Ｈ１）が約０．４であることを特徴とする。   The invention of claim 4 is the invention according to any one of claims 1 to 3, wherein when the maximum value of the internal pressure is 800 Mpa or more and autofrettage processing is performed, the taper portion inner diameter (D1) is set to 1. In this case, the shape and dimensions of the seal pin are such that the outer diameter (D2) of the outer peripheral portion (26) of the seal pin is about 1.08, the inner diameter (d) of the slot is about 0.7, and the depth of the slot ( H1) is about 0.4.

請求項５の発明は、請求項１から４のいずれか１項記載の発明において、前記シールピンの材質は、ヤング率が２１０Ｇｐａ以上、かつ、降伏点が１５００Ｍｐａ以上であることを特徴とする。   The invention of claim 5 is the invention according to any one of claims 1 to 4, characterized in that the material of the seal pin has a Young's modulus of 210 Gpa or more and a yield point of 1500 Mpa or more.

請求項６の発明は、請求項１から５発明のシールピン（２０）をキャップ（２１）内に保持して、キャップ（２１）を高圧燃料噴射管の配管口（２３）にねじ止めし、内圧の最大値が８００Ｍｐａ以上でオートフレッテージ加工を行う場合に、前記配管口（２３）を前記シールピン（２０）でシールした高圧燃料噴射管である。
これにより、請求項１の発明と同様な効果を得ることが出来る。 According to the sixth aspect of the present invention, the seal pin (20) of the first to fifth aspects of the present invention is held in the cap (21), and the cap (21) is screwed to the piping port (23) of the high-pressure fuel injection pipe, Is a high-pressure fuel injection pipe in which the pipe port (23) is sealed with the seal pin (20) when auto-frettage processing is performed at a maximum value of 800 Mpa or more.
Thereby, the same effect as that of the invention of claim 1 can be obtained.

なお、上記に付した符号は、後述する実施形態に記載の具体的実施態様との対応関係を示す一例である。   In addition, the code | symbol attached | subjected above is an example which shows a corresponding relationship with the specific embodiment as described in embodiment mentioned later.

本発明の基礎となった比較技術の全体的斜視図である。1 is an overall perspective view of a comparative technique on which the present invention is based. 図１の比較技術の要部の断面図である。It is sectional drawing of the principal part of the comparison technique of FIG. 図１の比較技術を模式的に示す説明図である。It is explanatory drawing which shows the comparison technique of FIG. 1 typically. 本発明の一実施形態を模式的に示す説明図である。It is explanatory drawing which shows typically one Embodiment of this invention. 本発明の一実施形態の要部を示す拡大図である。It is an enlarged view which shows the principal part of one Embodiment of this invention. 図５のＡ部を示す拡大図である。It is an enlarged view which shows the A section of FIG.

以下、図面を参照して、本発明の一実施形態を説明する。各実施態様について、同一構成の部分には、同一の符号を付してその説明を省略する。本発明の各実施形態が、本発明の基礎となった比較技術に対しても同一構成の部分には同一の符号を付してその説明を省略する。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings. About each embodiment, the same code | symbol is attached | subjected to the part of the same structure, and the description is abbreviate | omitted. In each embodiment of the present invention, parts having the same configuration are denoted by the same reference numerals with respect to the comparative technique on which the present invention is based, and the description thereof is omitted.

図１は、本発明の基礎となった比較技術の全体的斜視図である。図２は、図１の比較技術の要部の断面図である。図３は、図１の比較技術の概略を示す説明図である。
本発明の一実施形態を説明する前に、図１〜３を参照して、本発明の基礎となった比較技術を説明する。図２において、パレット１０に、オートフレッテージ加工を施すワーク１が設置されている。ワーク１の配管口２３には、密封ピン５の切頭円錐形状の密封端部５’が挿入されている。密封ピン５の他端には被押圧部６を有し、油圧シリンダなどに押圧される押圧部８が、圧力Ｐで密封ピン５に対して押圧できるようになっている。密封ピン５には、鍔７が設けられており、スプリング９によって、密封ピン５をワーク１の配管口２３に向けて予備的に押圧している。 FIG. 1 is an overall perspective view of a comparative technique on which the present invention is based. FIG. 2 is a cross-sectional view of a main part of the comparative technique of FIG. FIG. 3 is an explanatory diagram showing an outline of the comparative technique of FIG.
Before describing an embodiment of the present invention, a comparison technique on which the present invention is based will be described with reference to FIGS. In FIG. 2, a pallet 10 is provided with a workpiece 1 for performing autofrettage processing. A truncated conical sealed end portion 5 ′ of the sealing pin 5 is inserted into the piping port 23 of the workpiece 1. The other end of the sealing pin 5 has a pressed portion 6, and a pressing portion 8 pressed by a hydraulic cylinder or the like can be pressed against the sealing pin 5 with a pressure P. The sealing pin 5 is provided with a flange 7, and the sealing pin 5 is preliminarily pressed toward the piping port 23 of the work 1 by a spring 9.

図３に模式的に示すように、ワーク１を密閉状態にして内圧ｐ（一例として最大圧８００Ｍｐａ以上）をかけ、ワーク１の材料組織に残留応力を残して強度をあげる、オートフレッテージ加工を行う。このような方式のシールを用いると、内圧とのバランス合せのために油圧シリンダの圧力制御が複雑であり、油圧ポンプや高速弁などの付帯装置も必要となり、コスト高となってしまっていた。また、このような方式で自動化にした場合、ワーク搬送はパレット式になるため、パレット設備の費用が嵩むこととなる。さらに、ワーク品番が限定されておらず、ワークの開口部の位置が、常に定位置でない場合には、自動化にしたときに開口部の位置と密封端部との接続が非常に難しく、品番切替えのセッティングに問題が生じていた。   As schematically shown in FIG. 3, auto-frettage processing is performed in which the work 1 is sealed and an internal pressure p (for example, a maximum pressure of 800 Mpa or more) is applied to leave the residual stress in the material structure of the work 1 to increase the strength. Do. When such a seal is used, the pressure control of the hydraulic cylinder is complicated for balancing with the internal pressure, and additional devices such as a hydraulic pump and a high-speed valve are required, resulting in high costs. Moreover, when it automates by such a system, since a workpiece conveyance will be a pallet type, the expense of a pallet installation will increase. In addition, if the workpiece part number is not limited and the position of the workpiece opening is not always fixed, it is very difficult to connect the opening to the sealed end when automation is performed. There was a problem with the setting.

これに対して、本発明の一実施形態は次のようなものである。
図４は、本発明の一実施形態を模式的に示す説明図である。図５は、本発明の一実施形態の要部を示す拡大図である。図６は、図５のＡ部を示す拡大図である。
図４、５に示すように、超高圧下でオートフレッテージ加工を施すワーク１には、配管口２３が設けられている。配管口２３の外周は、ねじ切りされており、キャップ２１がねじで固定されている。図５に示すように、キャップ２１の内部には、穴３２が設けられており、シールピン２０が挿入されている。３０、３１は、ドレン穴である。 On the other hand, an embodiment of the present invention is as follows.
FIG. 4 is an explanatory view schematically showing an embodiment of the present invention. FIG. 5 is an enlarged view showing a main part of one embodiment of the present invention. FIG. 6 is an enlarged view showing a portion A of FIG.
As shown in FIGS. 4 and 5, a pipe port 23 is provided in the work 1 that is subjected to autofrettage processing under an ultra-high pressure. The outer periphery of the piping port 23 is threaded, and the cap 21 is fixed with screws. As shown in FIG. 5, a hole 32 is provided inside the cap 21, and the seal pin 20 is inserted therein. 30 and 31 are drain holes.

シールピン２０は、その外周が、シールピン外周部２６とシールピン端部外周部２５から構成されている。配管口２３の内側のテーパ部２３’にシールピン端部外周部２５の一部が接触する。シールピン端部外周部２５は、好ましくは半径Ｒ１の断面円弧状である。シールピン端部外周部２５は、上記円弧又は円弧状に限らず、円錐面を含む任意の曲面であってよい。さらに、配管口２３に挿入するシールピン端部の軸心部には、底部２２'を有する溝穴２２が設けられている。溝穴２２の底部２２’のコーナーには、Ｒ部が設けられている。底部２２’は球面であっても良い。   The outer periphery of the seal pin 20 includes a seal pin outer peripheral portion 26 and a seal pin end outer peripheral portion 25. A part of the outer peripheral portion 25 of the seal pin end comes into contact with the tapered portion 23 ′ inside the piping port 23. The seal pin end outer peripheral portion 25 preferably has a circular arc shape with a radius R1. The seal pin end outer peripheral portion 25 is not limited to the circular arc or the circular arc shape, and may be an arbitrary curved surface including a conical surface. Further, a slot 22 having a bottom portion 22 ′ is provided in the axial center portion of the end portion of the seal pin inserted into the piping port 23. An R portion is provided at a corner of the bottom portion 22 ′ of the slot 22. The bottom 22 'may be a spherical surface.

配管口２３の外周に対して、キャップ２１を回して、配管口２３の内側のテーパ部２３’にシールピン端部外周部２５の一部が、所定圧で接触するように調整する。
図４に模式的に示すように、ワーク１にキャップ２１をかぶせて、密閉状態にして内圧ｐ（一例として最大圧８００Ｍｐａ以上）をかけ、ワーク１の材料組織に残留応力を残して強度をあげる、オートフレッテージ加工を行う。このとき、メインの油圧源からの内圧ｐの力を利用し、シールピン２０の溝穴２２の側面側へ、すなわち、シールピン端部外周部２５方向に変形する力を働かせ、径方向へ膨らませて変形させる。シールピン端部の軸心部に設けられた溝穴２２に内圧がかかるので、テーパ部２３’に対して、シールピン端部外周部２５の一部が、超高圧の内圧によって弾性領域で変形して、高いシール耐圧を持って密着するのである。 The cap 21 is rotated with respect to the outer periphery of the piping port 23 so that a part of the outer peripheral portion 25 of the seal pin end is in contact with the tapered portion 23 ′ inside the piping port 23 with a predetermined pressure.
As schematically shown in FIG. 4, the work 21 is covered with a cap 21 and sealed to apply an internal pressure p (for example, a maximum pressure of 800 Mpa or more), leaving a residual stress in the material structure of the work 1 to increase the strength. , Auto fretage processing. At this time, using the force of the internal pressure p from the main hydraulic power source, the deformation force is applied to the side surface side of the slot 22 of the seal pin 20, that is, toward the outer peripheral portion 25 of the seal pin end, and is expanded and deformed in the radial direction. Let Since internal pressure is applied to the slot 22 provided in the axial center portion of the seal pin end portion, a part of the seal pin end outer peripheral portion 25 is deformed in the elastic region by the ultrahigh internal pressure with respect to the taper portion 23 ′. It adheres with a high seal pressure resistance.

これにより、超高圧に対応したシールが可能となる。ここで、超高圧とは、ディーゼル用コモンレールに使用される圧力を指している。一例としては、数百Ｍｐａ程度の圧力を指している。   Thereby, the seal corresponding to an ultra high pressure becomes possible. Here, the ultra-high pressure refers to the pressure used for the diesel common rail. As an example, it refers to a pressure of about several hundred Mpa.

テーパ部２３’に対して、シールピン端部外周部２５が、最大圧が８００Ｍｐａ以上の超高圧の内圧によって、弾性領域で変形して接触する場合のシールピンの形状について、一例として述べる。各々の寸法値については実験値と解析結果に基づき決定したが、これに限定されるものではない。   An example of the shape of the seal pin when the outer peripheral portion 25 of the seal pin end is deformed and contacted with the taper portion 23 ′ in the elastic region by an ultrahigh internal pressure of 800 Mpa or more is described as an example. Each dimension value is determined based on experimental values and analysis results, but is not limited thereto.

図６に示すように、シールピンの形状寸法の比率は、内圧の最大値が８００Ｍｐａ以上でオートフレッテージ加工を行う場合において、テーパ部２３’の内径Ｄ１を１としたときに（Ｄ１が３〜５ｍｍの間において）、シールピン外周部の外径Ｄ２が約１．０８、溝穴内径ｄが約０．７、溝穴深さＨ１が約０．４である。シールピン端部外周部２５の半径Ｒ１は、一例として、外径Ｄ２の１／２程度とすると良い。ここで、「約」とはそれぞれの数値の前後１０％以内であることを指す。   As shown in FIG. 6, the ratio of the shape dimension of the seal pin is determined when the inner diameter D1 of the taper portion 23 ′ is 1 when the maximum value of the internal pressure is 800 Mpa or more and when the inner diameter D1 of the tapered portion 23 ′ is 1. (Between 5 mm), the outer diameter D2 of the outer periphery of the seal pin is about 1.08, the inner diameter d of the slot is about 0.7, and the depth H1 of the slot is about 0.4. As an example, the radius R1 of the seal pin end outer peripheral portion 25 may be about ½ of the outer diameter D2. Here, “about” means within 10% before and after each numerical value.

この場合、テーパ部２３’の内径Ｄ１の穴（配管口２３の内側の穴）に対し、シールピンの外径を、約１０％程度大きく設定し、テーパ部２３’に確実に接触できるようにしたが、シールピン外周部の外径Ｄ２は約１．０８に限らず、テーパ部２３’に確実に接触できるように適宜設定すればよい。超高圧の内圧によって、弾性領域で変形して接触できるように、シールピン外周部の外径Ｄ２に対応して、他の比率も適宜設定すればよい。   In this case, the outer diameter of the seal pin is set to be approximately 10% larger than the hole having the inner diameter D1 of the taper portion 23 ′ (the hole inside the pipe port 23), so that the taper portion 23 ′ can be reliably contacted. However, the outer diameter D2 of the outer peripheral portion of the seal pin is not limited to about 1.08, and may be set as appropriate so that the taper portion 23 'can be reliably contacted. Other ratios may be set as appropriate in accordance with the outer diameter D2 of the outer peripheral portion of the seal pin so that it can be deformed and contacted in the elastic region by the ultrahigh internal pressure.

上記一実施形態では、一例として、内圧ｐの最大値が８００Ｍｐａ以上でオートフレッテージ加工を行う場合において、テーパ部内径Ｄ１を１としたときに、シールピン２０の形状寸法は、シールピン外周部Ｄ２が、１．０８である第１の数値又は第１の数値の前後１０％以内、溝穴内径（ｄ）が、０．７である第２の数値又は第２の数値の前後１０％以内、溝穴深さ（Ｈ１）が、０．４である第３の数値又は第３の数値の前後１０％以内である。この一例としての数値に限らず、超高圧の内圧によって、シールピン端部外周部２５が弾性領域で変形してテーパ部２３’に確実に接触できるように、シールピン外周部の外径Ｄ２その他の比率を適宜設定すると良い。   In the above-described embodiment, as an example, in the case where auto-frettage processing is performed with the maximum value of the internal pressure p being 800 Mpa or more, when the taper portion inner diameter D1 is 1, the shape dimension of the seal pin 20 is the seal pin outer peripheral portion D2. The first numerical value that is 1.08 or within 10% before or after the first numerical value, the groove inner diameter (d) is within 10% before or after the second numerical value or the second numerical value that is 0.7, the groove The hole depth (H1) is the third numerical value that is 0.4 or within 10% before and after the third numerical value. Not limited to this numerical value as an example, the outer diameter D2 of the seal pin outer peripheral portion and other ratios so that the seal pin end outer peripheral portion 25 can be deformed in the elastic region and reliably contact the taper portion 23 ′ by an ultrahigh internal pressure. May be set as appropriate.

シールピンの材質は、ヤング率が２１０Ｇｐａ以上、降伏点が１５００Ｍｐａ以上であることが必要である。一例として、ＳＫＨ５１などが挙げられるが、弾性領域で変形して接触でき、破損しないことが重要である。   The material of the seal pin needs to have a Young's modulus of 210 Gpa or more and a yield point of 1500 Mpa or more. An example is SKH51, but it is important that it can be deformed and contacted in the elastic region without being damaged.

図５のように、シールピン２０が弾性領域で変形して、配管口２３の内側のテーパ部２３’に、シールピン端部外周部２５の一部が接するように接触して、密着固定することが好ましい。その他、テーパ部２３’の最内周の角部で接触するようにしても良い。この場合においては、シールピン端部外周部２５の形状が、テーパ角６０度位の円錐形状であっても良い。   As shown in FIG. 5, the seal pin 20 is deformed in the elastic region, and the taper portion 23 ′ on the inner side of the pipe port 23 is brought into contact with a part of the outer peripheral portion 25 of the seal pin so as to be closely fixed. preferable. Alternatively, contact may be made at the innermost corner of the taper portion 23 '. In this case, the shape of the seal pin end outer peripheral portion 25 may be a conical shape with a taper angle of about 60 degrees.

内圧の最大値が８００Ｍｐａ以上の超高圧のシール条件の考え方は、以下のようなものである。
１．接触部において、漏れの無い面圧を確保する（シール力確保）。
２．発生応力を極力抑え、疲労破壊しない材料の耐圧強度を満足する（変形しても弾性領域である）。
口元がテーパ状にひろがる形状をもつ配管口に対し、前記１．の対応として、シールピン端部外周部２５の接触部形状を円弧状の形状にしている。前記２．の対応として、溝穴２２の底部２２’にコーナーＲを持たせている。溝穴２２の底部２２’のコーナーＲの効果としては、応力集中回避と、強度アップにつながる壁の肉厚確保が挙げられる。 The concept of the ultra-high pressure seal condition in which the maximum value of the internal pressure is 800 Mpa or more is as follows.
1. Ensure contact-free surface pressure at the contact area (ensure sealing force).
2. Suppresses the generated stress as much as possible and satisfies the pressure resistance of the material that does not cause fatigue failure (it is an elastic region even if it is deformed).
For the piping port having a shape in which the mouth is tapered, the above-mentioned 1. As a countermeasure to this, the contact portion shape of the seal pin end outer peripheral portion 25 is formed in an arc shape. 2. As a countermeasure, a corner R is provided at the bottom 22 ′ of the slot 22. The effects of the corner R of the bottom 22 'of the slot 22 include avoiding stress concentration and securing the wall thickness that leads to increased strength.

本発明のシールピン２０を用いたオートフレッテージ加工を行う手順（方法）について、以下に説明する。ワーク１をパレット１０に固定する。オートフレッテージ加工の前工程として、キャップ２２をネジ締め機で配管口に固定する。つぎに、オートフレッテージ加工処理を行う。これにより、ワーク１は、密閉状態で高圧をかけて材料組織に残留応力を残して強度をあげることができる。その後、後工程で、ネジ締め機で配管口２３からキャップ２０を取り外す。なお、ワーク搬送手段は、パレット１０に特に限定する必要はなく、位置決め及び搬送ができれば良い。   A procedure (method) for performing auto-frettage processing using the seal pin 20 of the present invention will be described below. The workpiece 1 is fixed to the pallet 10. As a pre-process of auto-frettage processing, the cap 22 is fixed to the piping port with a screw tightener. Next, auto-frettage processing is performed. Thereby, the workpiece | work 1 can raise the intensity | strength, leaving a residual stress in a material structure | tissue by applying a high voltage | pressure in a sealed state. Then, the cap 20 is removed from the piping port 23 with a screw fastening machine in a post process. The work conveying means is not particularly limited to the pallet 10 as long as it can be positioned and conveyed.

１ ワーク
２０ シールピン
２１ キャップ
２２ 溝穴
２３ 配管口
２５ シールピン端部外周部
２６ シールピン外周部 1 Workpiece 20 Seal pin 21 Cap 22 Groove hole 23 Piping port 25 Seal pin end outer peripheral portion 26 Seal pin outer peripheral portion

Claims (6)

超高圧下で高圧燃料噴射管にオートフレッテージ加工を行うために、該高圧燃料噴射管の配管口（２３）をシールするためのシールピン（２０）であって、
該シールピン（２０）は、前記配管口（２３）に挿入するシールピン端部の軸心部に設けられた、底部（２２'）を有する溝穴（２２）と、
前記配管口（２３）の内側のテーパ部（２３’）に接触する、シールピン端部外周部（２５）と、を具備しており、
前記テーパ部（２３’）に対して、前記シールピン端部外周部（２５）が、超高圧の内圧によって弾性領域で変形して、接触するように構成されたシールピン。 A seal pin (20) for sealing a piping port (23) of the high-pressure fuel injection pipe in order to perform autofrettage processing on the high-pressure fuel injection pipe under ultra-high pressure,
The seal pin (20) includes a slot (22) having a bottom portion (22 ′) provided in an axial center portion of a seal pin end portion to be inserted into the pipe port (23),
An outer peripheral portion (25) of the seal pin that contacts the tapered portion (23 ') inside the piping port (23),
A seal pin configured such that the outer peripheral portion (25) of the seal pin end portion is deformed in an elastic region by an ultra-high internal pressure and contacts the tapered portion (23 '). 前記シールピン端部外周部（２５）が、断面円弧状であることを特徴とする請求項１に記載のシールピン。   The seal pin according to claim 1, wherein the seal pin end outer peripheral part (25) has an arcuate cross section. 前記溝穴（２２）の前記底部（２２’）のコーナーに、Ｒ部が設けられているか、又は、前記底部（２２'）が球面であることを特徴とする請求項１又は２に記載のシールピン。   The corner of the bottom part (22 ') of the slot (22) is provided with an R part or the bottom part (22') is a spherical surface according to claim 1 or 2, Seal pin. 前記内圧の最大値が８００Ｍｐａ以上でオートフレッテージ加工を行う場合において、前記テーパ部内径（Ｄ１）を１としたときに、前記シールピンの形状寸法は、シールピン外周部（２６）の外径（Ｄ２）が約１．０８、かつ、溝穴内径（ｄ）が約０．７、かつ、溝穴深さ（Ｈ１）が約０．４であることを特徴とする請求項１から３のいずれか１項に記載のシールピン。   In the case of performing auto-frettage processing at a maximum value of the internal pressure of 800 Mpa or more, when the taper portion inner diameter (D1) is 1, the shape dimension of the seal pin is the outer diameter (D2 of the seal pin outer peripheral portion (26). ) Is about 1.08, the slot inner diameter (d) is about 0.7, and the slot depth (H1) is about 0.4. The seal pin according to item 1. 前記シールピンの材質は、ヤング率が２１０Ｇｐａ以上、かつ、降伏点が１５００Ｍｐａ以上であることを特徴とする請求項１から４のいずれか１項に記載のシールピン。   The seal pin according to any one of claims 1 to 4, wherein the material of the seal pin has a Young's modulus of 210 Gpa or more and a yield point of 1500 Mpa or more. 請求項１から５のいずれか１項に記載のシールピン（２０）をキャップ（２１）内に保持して、キャップ（２１）を高圧燃料噴射管の配管口（２３）にねじ止めし、内圧の最大値が８００Ｍｐａ以上でオートフレッテージ加工を行う場合に、前記配管口（２３）を前記シールピン（２０）でシールした高圧燃料噴射管。   The seal pin (20) according to any one of claims 1 to 5 is held in the cap (21), and the cap (21) is screwed to the piping port (23) of the high-pressure fuel injection pipe, and the internal pressure is reduced. A high-pressure fuel injection pipe in which the pipe port (23) is sealed with the seal pin (20) when auto-frettage processing is performed at a maximum value of 800 Mpa or more.
JP2010008943A 2010-01-19 2010-01-19 High pressure fuel injection pipe seal pin Expired - Fee Related JP5340184B2 (en)

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JP2010008943A JP5340184B2 (en) 2010-01-19 2010-01-19 High pressure fuel injection pipe seal pin
DE201110000121 DE102011000121A1 (en) 2010-01-19 2011-01-13 A sealing pin for a pipe for use in high pressure fuel injection and pipe for use in high pressure fuel injection with the same
FR1150294A FR2955273B1 (en) 2010-01-19 2011-01-14 SEALING FINGER FOR A TUBE TO BE USED FOR HIGH PRESSURE FUEL INJECTION AND TUBE FOR USE IN HIGH PRESSURE FUEL INJECTION USING THE SEALING FINGER
CN 201110021595 CN102128333B (en) 2010-01-19 2011-01-19 Sealing pin of pipeline for spraying use of high-pressure fuel and pipeline used for spraying use of high-pressure fuel with the same

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US9133802B2 (en) 2013-05-09 2015-09-15 Caterpillar Inc. Device for sealing orifices on nozzle of fuel injector for autofrettage process
GB201501987D0 (en) * 2015-02-06 2015-03-25 Delphi International Operations Luxembourg S.�.R.L. Method to manufacture a common rail

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