JPS6131659A - Fuel injection valve - Google Patents
Fuel injection valveInfo
- Publication number
- JPS6131659A JPS6131659A JP15464984A JP15464984A JPS6131659A JP S6131659 A JPS6131659 A JP S6131659A JP 15464984 A JP15464984 A JP 15464984A JP 15464984 A JP15464984 A JP 15464984A JP S6131659 A JPS6131659 A JP S6131659A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- nozzle
- nozzle body
- piece
- fuel injection
- 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
- 238000002347 injection Methods 0.000 title claims abstract description 17
- 239000007924 injection Substances 0.000 title claims abstract description 17
- 239000000446 fuel Substances 0.000 title abstract description 23
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 239000000295 fuel oil Substances 0.000 abstract description 9
- 229910010293 ceramic material Inorganic materials 0.000 abstract description 8
- 239000000919 ceramic Substances 0.000 abstract description 4
- 239000012535 impurity Substances 0.000 abstract description 4
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 230000035939 shock Effects 0.000 abstract 1
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- VNTLIPZTSJSULJ-UHFFFAOYSA-N chromium molybdenum Chemical compound [Cr].[Mo] VNTLIPZTSJSULJ-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005496 tempering 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
- 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
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は内燃機関用燃料噴射弁に関するものである。[Detailed description of the invention] (Industrial application field) The present invention relates to a fuel injection valve for an internal combustion engine.
（従来技術）
従来の内燃機関用燃料噴射弁に於いては、バルブシート
部分を金属材料で形成するのか通例であった。(Prior Art) In conventional fuel injection valves for internal combustion engines, the valve seat portion has generally been formed of a metal material.
又、近年、燃料価格の高騰からディーゼル′機関におい
てはその燃料を良質重油から低質重油に切り換える傾向
にある。Furthermore, in recent years, due to the rise in fuel prices, there has been a trend to switch the fuel used in diesel engines from high-quality heavy oil to low-quality heavy oil.
ところが、このように金属材料で形成されたバルブシー
トを有する燃料噴射弁をディーゼル機関に備え且つ燃料
として低質重油を使用するようにした場合には、
（１） 低質重油には多種且つ多量の不純物か含まれ
ており、この含有不純物により燃料噴射弁のバルブシー
ト部分の摩耗が増長される、（２）低質重油は高粘度油
であるためその使用Ｉ＋噌１イｉｊ １ｔ、：旧六−官
弘イ＊ト＃亡−１田τキ江す別↓拍！ｌｔらないが、そ
の場合、油温によって燃料噴射弁のバルブシート部分が
加熱され、特に、その温度か核バルブシートを形成する
金属月利（鋼）の焼き戻し温度以上になった場合には該
バルブノート部分の硬度が急激に低下して該バルブシー
ト部分の耐摩耗性が低下する、
等の原因によって燃料噴射弁の耐久性が低下し且つ燃料
・の噴射特性が悪化するという問題があった。However, when a diesel engine is equipped with a fuel injection valve having a valve seat made of a metal material and low-quality heavy oil is used as fuel, (1) the low-quality heavy oil contains many types and large amounts of impurities; (2) Since low quality heavy oil is a high viscosity oil, its use I + 噌 1 ij 1 t,: former 6 government Hiroi*to #death-1 田τkiesu another ↓ beat! However, in that case, the valve seat part of the fuel injector is heated by the oil temperature, especially if the temperature exceeds the tempering temperature of the metal (steel) that forms the core valve seat. There is a problem in that the durability of the fuel injector decreases and the fuel injection characteristics deteriorate due to causes such as a sudden decrease in the hardness of the valve note portion and a decrease in the wear resistance of the valve seat portion. Ta.
（発明の目的）
本発明は上記従来技術の項で指摘した問題点を解決また
は改善しようとしてなされたもので低質重Ａ」４＝を燃
料として使用するディーゼル機関に装着される燃料噴射
弁において、その耐久性の向上を図り且つ燃料の噴射特
性を長期に亘って良好に維持し得るようにすることを目
的とするものである。(Object of the Invention) The present invention has been made in an attempt to solve or improve the problems pointed out in the above-mentioned section of the prior art. The purpose is to improve its durability and maintain good fuel injection characteristics over a long period of time.
（目的を達成するための手段）
本発明は上記の目的を達成するための手段として、
（Ａ−１） バルブシートを有するシートピースをセ
ラミック材で構成し、
（Ａ−２） 該シートピースをノズルボディと先端ピ
ースの間にしかもその軸方向に圧縮力を付加した状態で
介在させ、
（Ａ−３） 該ノズルボディと先端ピースをナツト部
材によって軸方向に結合する、
ものである。(Means for Achieving the Object) The present invention provides the following means for achieving the above object: (A-1) A seat piece having a valve seat is made of a ceramic material; (A-2) The seat piece is made of a ceramic material. A compressive force is applied between the nozzle body and the tip piece in the axial direction thereof, and (A-3) the nozzle body and the tip piece are coupled in the axial direction with a nut member.
（作 用）
本発明では
（１）上記（Ａ−１）の手段によって、バルブシート部
分の耐摩耗性が向上するという作用が得られ、
（２）上記（Ａ−２）の手段によって、セラミック材に
引張力が負荷された時、該引張力を初期圧縮力によって
相殺軽減して該セラミック材の積換を防止するという作
用が得られ、
（３）上記（Ａ−３）の手段によって、ノズルバルブの
着座時にバルブソートに作用する衝撃力（軸方向力）を
螺合部分の弾性によって吸収緩和してセラミック材の衝
撃による損壊を防止するという作用が得られる。(Function) In the present invention, (1) the above means (A-1) provides the effect of improving the wear resistance of the valve seat portion, and (2) the above means (A-2) provides the effect of improving the wear resistance of the valve seat portion. When a tensile force is applied to the material, the tensile force is offset and reduced by the initial compressive force to prevent transshipment of the ceramic material, (3) By the means of (A-3) above, The impact force (axial force) that acts on the valve sort when the nozzle valve is seated is absorbed and relaxed by the elasticity of the threaded portion, thereby preventing damage to the ceramic material due to impact.
（実施例）
以下、図面を参照して本発明の好適な実施例を説明する
と、この実施例の燃料噴射弁Ｚはその軸心部にバルブ嵌
挿穴３１を形成した段付軸状のノズルボディ２を有して
いる。このノズルボディ２のバルブ嵌挿穴３１内にはセ
ラミックで形成された軸状のノズルバルブ１がその弁頭
Ｉ＋を該ノズルボディ２の先端面２ａ側に向けた状態で
摺動自在に嵌挿されている。(Embodiment) Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. The fuel injection valve Z of this embodiment is a stepped shaft-shaped nozzle with a valve insertion hole 31 formed in its shaft center. It has a body 2. A shaft-shaped nozzle valve 1 made of ceramic is slidably inserted into the valve insertion hole 31 of the nozzle body 2 with its valve head I+ facing toward the tip surface 2a of the nozzle body 2. has been done.
ノズルボディ２の先端部２ｂの外側には、その先端部に
噴口１３，１３・・を形成するとともに、反噴口形成側
端面３ｂ側から大径深穴状の嵌合穴３２を形成した略有
底筒状の先端ピース３が、該ノズルボディ２と同軸状で
且つ軸方向に摺動自在に嵌挿されている。このノズルボ
ディ２の先端部２ｂと先端ピース３の嵌合穴３２の間に
は、前記ノズルバルブＪの弁頭１１が着座せしめられる
バルブシー）・１５を形成したセラミック製のシート２
側に向けた状態で嵌装されている。On the outside of the tip 2b of the nozzle body 2, there are nozzles 13, 13, . A bottom cylindrical tip piece 3 is fitted coaxially with the nozzle body 2 and slidably in the axial direction. Between the tip 2b of the nozzle body 2 and the fitting hole 32 of the tip piece 3, a ceramic seat 2 is formed with a valve seat 15 on which the valve head 11 of the nozzle valve J is seated.
It is installed facing towards the side.
さらに、このノズルボディ２と先端ピース３は、該ノズ
ルボディ２の中段部外周面に形成した雄ネジ（右ネ′）
）２１と先端ピース３の外周面に形成した雄ネジ（左ネ
ジ）２２にそれぞれ螺合可能な第１雌ネジ（右ネジ）２
３と第２雌ネジ（左ネジ）２４を有するナンド部材４に
よって軸方向に結合されている。従って、ナツト部材４
の螺回操作によって先端ピース３はノズルボディ２に対
して接離せしめられ、該ノズルボディ２の先端面２ａと
先端ピース３の嵌合穴底面３２ａの間で前記シートピー
ス５を着脱自在に挟着支持する如く作用する。尚、この
ナツト部材４の締込量（換言すれば、ノズルボディ２と
先端ピース３との軸方向間隔）は、ノズルボディ先端面
２ａと先端ピース３の嵌合穴底面３２ａの間に作用する
軸力によって前記シートピース５に適度の軸方向圧縮力
を付与せしめ得るように適宜に設定される。Further, the nozzle body 2 and the tip piece 3 have a male thread (right-hand thread') formed on the outer peripheral surface of the middle part of the nozzle body 2.
) 21 and a first female thread (right-hand thread) 2 that can be screwed into the male thread (left-hand thread) 22 formed on the outer peripheral surface of the tip piece 3, respectively.
3 and a NAND member 4 having a second female thread (left-hand thread) 24 in the axial direction. Therefore, the nut member 4
The tip piece 3 is moved toward and away from the nozzle body 2 by the screw operation, and the sheet piece 5 is removably sandwiched between the tip surface 2a of the nozzle body 2 and the bottom surface 32a of the fitting hole of the tip piece 3. It acts like a support. The tightening amount of this nut member 4 (in other words, the axial distance between the nozzle body 2 and the tip piece 3) acts between the nozzle body tip surface 2a and the fitting hole bottom surface 32a of the tip piece 3. It is appropriately set so that an appropriate axial compressive force can be applied to the sheet piece 5 by the axial force.
尚、この実施例においては、ノズルボディ２と（例えば
、クロム・モリブデン鋼）としている。In this embodiment, the nozzle body 2 is made of chromium-molybdenum steel, for example.
上述の如く構成された燃料噴射弁Ｚにおいて１よ、シー
トピース５とノズルバルブ１とをともに耐熱性及び耐摩
性に優れたセラミック材で形成しているため、燃料とし
て不純物が多くしかも粘度の高い低質重油を使用した場
合であっても、含有不純物によるバルブノート１５とノ
ズルバルブ弁頭１１の異常摩耗、あるいは燃料油温によ
る該バルブシート１５とノズルバルブ弁頭１１の硬度低
下が未然に防止される。従って、燃料噴射弁Ｚの耐久性
が向」二するとともに、燃料の噴射特性も長期に亘って
良好に維持されることになる。In the fuel injection valve Z configured as described above, first, since both the seat piece 5 and the nozzle valve 1 are made of a ceramic material with excellent heat resistance and wear resistance, the fuel contains many impurities and has a high viscosity. Even when low-quality heavy oil is used, abnormal wear of the valve note 15 and nozzle valve head 11 due to impurities contained therein, or a decrease in hardness of the valve seat 15 and nozzle valve head 11 due to fuel oil temperature, can be prevented. Ru. Therefore, the durability of the fuel injection valve Z is improved, and the fuel injection characteristics are also maintained satisfactorily over a long period of time.
又、このセラミック材は圧縮力には強いが引張力及び衝
撃力には弱いという欠点を有しているか、この実施例に
おいてはシートピース５の組イ」時に該シートピース５
に予じめ適度の圧縮ツノ（初期圧縮力）を付与せしめて
いるため、該シートピース５に何らかの原因て引張力か
作用した場合であっても該引張力を初期圧縮力で相殺軽
減させて該引張力による該ノートピース５の損壊を未然
に防止することができる。又、ノズルバルブ１の弁頭１
１がシートピース５のバルブシート１５に着座する際、
該シートピース５及びノズルバルブ１にそれぞれ衝撃力
が作用するが、この実施例においてはノズルボディ２と
先端ピース３とをナツト部材４で結合しているため、こ
のノズルバルブ１の着座時の衝撃力がナツト部材４とノ
ズルボディ２と先端ピース３相互間の螺合部における弾
性で吸収緩和され、シートピース５及びノズルバルブ１
の衝撃による損壊が未然に防止される。Also, this ceramic material has the disadvantage that it is strong against compressive force but weak against tensile force and impact force.In this embodiment, when the sheet piece 5 is assembled, the sheet piece 5
Since a moderate compression horn (initial compression force) is applied to the sheet piece 5 in advance, even if a tensile force is applied to the sheet piece 5 for some reason, the tensile force is offset and reduced by the initial compression force. Damage to the notebook piece 5 due to the tensile force can be prevented. Also, the valve head 1 of the nozzle valve 1
1 is seated on the valve seat 15 of the seat piece 5,
An impact force acts on the seat piece 5 and the nozzle valve 1, but in this embodiment, since the nozzle body 2 and the tip piece 3 are connected by a nut member 4, the impact force is applied when the nozzle valve 1 is seated. The force is absorbed and alleviated by the elasticity of the threaded joint between the nut member 4, nozzle body 2, and tip piece 3, and
Damage due to impact is prevented.
（発明の効果）
本発明の燃料噴射弁は上記の説明からも明らかなように
、バルブンー ト部分を耐摩性及び耐熱性に優れたセラ
ミック材で形成することにより該バルブノート部分の耐
摩性を向上させ、また螺合部の弾性によってノズルバル
ブのバルブシートへの着座時における衝撃を吸収緩和し
て該バルブシート部分の損壊を防止するようにしている
ため、燃料噴射弁の耐久性が向上し且つ燃料の噴射特性
が長期に亘って良好に維持されるという効果が得られる
。(Effects of the Invention) As is clear from the above description, the fuel injection valve of the present invention improves the wear resistance of the valve note portion by forming the valve note portion from a ceramic material with excellent wear resistance and heat resistance. In addition, the elasticity of the threaded part absorbs and alleviates the impact when the nozzle valve is seated on the valve seat, thereby preventing damage to the valve seat portion, improving the durability of the fuel injection valve. The effect is that the fuel injection characteristics are maintained well over a long period of time.
図面は本発明実施例に係る燃料噴射弁の縦断面図である
。
１ ・・・・・ノズルノくルブ
２ ・・・・・ノズルボディ
３ ・・・・・先端ピース
４ ・ ・ ・ ・ ・す・ソト部材５ ・・・・・
ノートピース
１１・・・・・弁 頭
１３・・・・・噴口
１５・・・・・バルブノートThe drawing is a longitudinal sectional view of a fuel injection valve according to an embodiment of the present invention. 1 ...Nozzle nozzle lub 2 ...Nozzle body 3 ...Tip piece 4 ...... Soto member 5 ...
Note piece 11... Valve head 13... Nozzle 15... Valve note
Claims (1)
ズルバルブ（１）をその軸方向に摺動変位自在に装着せ
しめたノズルボディ（２）の先端部（２ｂ）に、噴口（
１３），（１３）・・を有する金属製の先端ピース（３
）が、該先端ピース（３）と前記ノズルボディ（２）の
先端面（２ａ）との間に、前記ノズルバルブ（１）の弁
頭（１１）を着座せしめるバルブシート（１５）を有す
るセラミック製のシートピース（５）を介在させた状態
でしかも前記ノズルボディ（２）と同軸状且つ軸方向に
相対変位自在に装着され、さらに前記ノズルボディ（２
）と前記先端ピース（３）とが金属製のナット部材（４
）によりしかも前記シートピース（５）に対して軸方向
に適度の圧縮力を付与せしめた状態で軸方向に結合され
ていることを特徴とする燃料噴射弁。1. A nozzle body (2) has an injection port (
13), (13)...
) has a valve seat (15) for seating the valve head (11) of the nozzle valve (1) between the tip piece (3) and the tip surface (2a) of the nozzle body (2); The seat piece (5) made of
) and the tip piece (3) are metal nut members (4
) and is coupled in the axial direction to the seat piece (5) in a state in which an appropriate compressive force is applied in the axial direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15464984A JPS6131659A (en) | 1984-07-24 | 1984-07-24 | Fuel injection valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15464984A JPS6131659A (en) | 1984-07-24 | 1984-07-24 | Fuel injection valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6131659A true JPS6131659A (en) | 1986-02-14 |
Family
ID=15588844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15464984A Pending JPS6131659A (en) | 1984-07-24 | 1984-07-24 | Fuel injection valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6131659A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6326480A (en) * | 1986-07-18 | 1988-02-04 | Toa Valve Kk | Thermal relief valve |
| JPH07259693A (en) * | 1994-03-14 | 1995-10-09 | Cummins Engine Co Inc | Abrasion-resistant plunger assembly and opening-nozzle unit fuel injector |
| EP0683314A1 (en) * | 1994-05-18 | 1995-11-22 | Cummins Engine Company, Inc. | Ceramic fuel injector timing plunger |
| US5899383A (en) * | 1994-05-18 | 1999-05-04 | Cummins Engine Company, Inc. | Ceramic fuel injector timing plunger |
| FR2775737A1 (en) * | 1998-03-06 | 1999-09-10 | Bosch Gmbh Robert | FUEL INJECTION DEVICE FOR INTERNAL COMBUSTION ENGINE |
| DE102005018589A1 (en) * | 2005-04-21 | 2006-11-02 | Siemens Ag | Needle guide body for injector of fuel injection system embodied as electrically insulating ceramic body with axial hole in which is metal casing forming guide for needle; bonding device for same; injector with bonding device |
| JP2015025454A (en) * | 2013-07-26 | 2015-02-05 | マン・ディーゼル・アンド・ターボ・エスイー | Fuel injection nozzle |
-
1984
- 1984-07-24 JP JP15464984A patent/JPS6131659A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6326480A (en) * | 1986-07-18 | 1988-02-04 | Toa Valve Kk | Thermal relief valve |
| JPH049951B2 (en) * | 1986-07-18 | 1992-02-21 | ||
| JPH07259693A (en) * | 1994-03-14 | 1995-10-09 | Cummins Engine Co Inc | Abrasion-resistant plunger assembly and opening-nozzle unit fuel injector |
| EP0683314A1 (en) * | 1994-05-18 | 1995-11-22 | Cummins Engine Company, Inc. | Ceramic fuel injector timing plunger |
| US5899383A (en) * | 1994-05-18 | 1999-05-04 | Cummins Engine Company, Inc. | Ceramic fuel injector timing plunger |
| FR2775737A1 (en) * | 1998-03-06 | 1999-09-10 | Bosch Gmbh Robert | FUEL INJECTION DEVICE FOR INTERNAL COMBUSTION ENGINE |
| DE102005018589A1 (en) * | 2005-04-21 | 2006-11-02 | Siemens Ag | Needle guide body for injector of fuel injection system embodied as electrically insulating ceramic body with axial hole in which is metal casing forming guide for needle; bonding device for same; injector with bonding device |
| JP2015025454A (en) * | 2013-07-26 | 2015-02-05 | マン・ディーゼル・アンド・ターボ・エスイー | Fuel injection nozzle |
| CN104343608A (en) * | 2013-07-26 | 2015-02-11 | 曼柴油机和涡轮机欧洲股份公司 | Fuel injection nozzle |
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