JPH11200999A - Fuel injection valve for internal combustion engine - Google Patents
Fuel injection valve for internal combustion engineInfo
- Publication number
- JPH11200999A JPH11200999A JP341198A JP341198A JPH11200999A JP H11200999 A JPH11200999 A JP H11200999A JP 341198 A JP341198 A JP 341198A JP 341198 A JP341198 A JP 341198A JP H11200999 A JPH11200999 A JP H11200999A
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- valve
- valve body
- fuel injection
- fuel passage
- 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
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
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
-
- 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
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/08—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of fuel flow
-
- 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
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
-
- 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
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
- F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
-
- 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
- F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging orifices
-
- 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
- F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging orifices
- F02M61/163—Means being injection-valves with helically or spirally shaped grooves
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、内燃機関用燃料噴
射弁に関し、特に、旋回流として燃料を噴射するための
燃料通路を備えた内燃機関用燃料噴射弁に関する。The present invention relates to a fuel injection valve for an internal combustion engine, and more particularly, to a fuel injection valve for an internal combustion engine having a fuel passage for injecting fuel as a swirling flow.
【0002】[0002]
【従来の技術】燃料を直接筒内(燃焼室内)に噴射する
筒内噴射型の内燃機関に適用される従来の燃料噴射弁と
しては、例えば、特開平9−79106号公報、特開平
9−133061号公報、特開平9−79108号公報
等に示されるようなものがある。2. Description of the Related Art As a conventional fuel injection valve applied to an in-cylinder injection type internal combustion engine which injects fuel directly into a cylinder (combustion chamber), for example, JP-A-9-79106 and JP-A-9-79106 Japanese Patent Application Laid-Open No. 133061, JP-A-9-79108, and the like.
【0003】上記特開平9−79106号公報に開示の
燃料噴射弁は、図14に示すように、略円筒形状をなし
かつ端部に燃料噴射孔100aを有する本体ケース10
0と、この本体ケース100の内部に往復動自在に収容
されて、噴射孔100aの開閉を行う弁体200等を備
えており、非作動時において、弁体200の端部に形成
された略円錐形状のテーパ部200aがシート面100
bに当接して、燃料が満たされた本体ケース100の内
部空間Sと燃料噴射孔100aとの連通を遮断してい
る。As shown in FIG. 14, the fuel injection valve disclosed in Japanese Patent Application Laid-Open No. 9-79106 has a body case 10 having a substantially cylindrical shape and having a fuel injection hole 100a at an end.
And a valve body 200 and the like, which is reciprocally housed inside the main body case 100 and opens and closes the injection hole 100a, and is formed at an end of the valve body 200 when not in operation. The conical tapered portion 200a is
b, the communication between the internal space S of the main body case 100 filled with fuel and the fuel injection holes 100a is cut off.
【0004】ここで、燃料噴射開始信号が発せられる
と、弁体200の上方に配置された電磁石(不図示)が
作動して弁体200を上方(U方向)に引き上げ、図1
4に示すように、弁体200のテーパ部200aと本体
ケース100のシート面100bとの間に燃料の通路が
形成され、所定の値に加圧された燃料は、弁体200の
外周面に形成されたスワール(旋回)流形成通路200
b、テーパ部200aとシート面100bとの間の通
路、燃料噴射孔100aを通って外部に噴射される。Here, when a fuel injection start signal is issued, an electromagnet (not shown) disposed above the valve body 200 is actuated to pull the valve body 200 upward (U direction).
As shown in FIG. 4, a fuel passage is formed between the tapered portion 200a of the valve body 200 and the seat surface 100b of the main body case 100, and the fuel pressurized to a predetermined value is applied to the outer peripheral surface of the valve body 200. The formed swirl flow path 200
b, the fuel is injected to the outside through the passage between the tapered portion 200a and the seat surface 100b and the fuel injection hole 100a.
【0005】この際、スワール流形成通路200bを通
ってきた燃料には円周方向の旋回力が付与され、燃料噴
射孔100aから噴射される燃料の微粒化、噴霧形状の
均一化が行なわれることになる。At this time, a circumferential swirling force is applied to the fuel that has passed through the swirl flow forming passage 200b, so that the fuel injected from the fuel injection hole 100a is atomized and the spray shape is made uniform. become.
【0006】一方、燃料噴射停止信号が発せられると、
電磁石が非作動の状態となり、弁体200は、弁体20
0の上方に配置された復帰ばね(不図示)の付勢力と燃
料の圧力とにより、下方(U方向と逆方向)に移動し
て、テーパ部200aが本体ケース100のシート面1
00bに着座し、燃料の通路を遮断するようになってい
る。On the other hand, when the fuel injection stop signal is issued,
The electromagnet is in a non-operating state, and the valve body 200
0, the urging force of a return spring (not shown) and the pressure of the fuel cause the tapered portion 200a to move downward (in a direction opposite to the U direction), so that the tapered portion 200a
00b to shut off the fuel passage.
【0007】また、上記特開平9−133061号公報
に開示の燃料噴射弁は、図15に示すように、前述同様
の燃料噴射孔110a,シート面110b等を有する本
体ケース110と、この本体ケース110の内部に往復
動自在に収容されて略円錐形状のテーパ部210a,ス
ワール流形成通路210b等を有する弁体210等を備
えており、さらに、本体ケース110には、別個に燃料
を供給するバイパス通路110cが形成されている。Further, as shown in FIG. 15, a fuel injection valve disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 9-133061 has a main body case 110 having a fuel injection hole 110a, a seat surface 110b, etc. A valve body 210 and the like, which are housed in a reciprocating manner in a reciprocating manner and have a substantially conical tapered portion 210a, a swirl flow forming passage 210b, and the like, are provided. Further, fuel is separately supplied to the main body case 110. A bypass passage 110c is formed.
【0008】この燃料噴射弁では、弁体210が上方
(U方向)に引き上げられた作動時に、バイパス通路1
10cからも燃料を供給することで、燃料噴霧の特性、
燃料噴霧の噴射角度等を調節できるようになっている。In this fuel injection valve, when the valve element 210 is moved upward (U direction), the bypass passage 1
By supplying fuel from 10c, the characteristics of fuel spray,
The fuel spray angle and the like can be adjusted.
【0009】一方、非作動時には、前述同様弁体210
が下方(U方向と逆方向)に移動して、弁体210のテ
ーパ部210aが本体ケース110のシート面110b
に着座し、燃料の通路を遮断するようになっている。On the other hand, when not operating, the valve element 210
Moves downward (in the direction opposite to the U direction) so that the tapered portion 210a of the valve body 210
, And shut off the fuel passage.
【0010】さらに、上記特開平9−79108号公報
に開示の燃料噴射弁は、図16に示すように、略円筒形
状をなしかつ端部に外向きに拡がったテーパ形状をなす
燃料噴射孔120aを有する本体ケース120と、この
本体ケース120内に収容されかつスワール(旋回)流
形成通路300aを有するガイド部材300に往復動自
在に案内されて上記燃料噴射孔120aを外開き式に開
閉する弁体220等を備えており、非作動時において、
弁体220の端部に形成された略円錐形状のテーパ部2
20aがシート面としての燃料噴射孔120aに直接当
接して、燃料の通路を遮断するようになっている。Further, as shown in FIG. 16, the fuel injection valve disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 9-79108 has a fuel injection hole 120a having a substantially cylindrical shape and a tapered shape expanding outward at an end. And a valve housed in the main body case 120 and guided by the guide member 300 having a swirl (swirl) flow forming passage 300a so as to be reciprocally movable to open and close the fuel injection holes 120a. Body 220 etc., when not operating,
A substantially conical tapered portion 2 formed at the end of the valve body 220
20a is in direct contact with the fuel injection hole 120a as a seat surface to shut off the fuel passage.
【0011】[0011]
【発明が解決しようとする課題】しかしながら、上記従
来の燃料噴射弁においては、以下のような問題点があっ
た。However, the above-mentioned conventional fuel injection valve has the following problems.
【0012】すなわち、特開平9−79106号公報及
び特開平9−133061号公報に開示の燃料噴射弁に
おいては、弁体200,210のテーパ部200a,2
10aが本体ケース100,110のシート面100
b,110bに着座して燃料通路を遮断した状態で、こ
の着座位置よりも下流側の領域、すなわち、図14及び
図15に示すように、燃料噴射孔100a,110a側
の隙間領域Aに燃料が付着し、又、着座位置よりも上流
側でかつスワール流形成通路200b,210bの下流
側に旋回力を失った燃料が溜まり、次の燃料噴射の際
に、これら付着あるいは溜った燃料が粒径の大きな燃料
粒子の塊として噴出し、ペネトレーションの増加等によ
るすすの発生あるいは燃焼の不安定化を招くという問題
があった。That is, in the fuel injection valve disclosed in Japanese Patent Application Laid-Open Nos. 9-79106 and 9-133061, the tapered portions 200a, 2
10a is the seat surface 100 of the main body cases 100 and 110
In the state where the fuel passage is shut off by sitting on the fuel injection holes 100a and 110b, the fuel is injected into the gap area A on the side of the fuel injection holes 100a and 110a, as shown in FIGS. The fuel that has lost the turning force is accumulated on the upstream side of the seating position and on the downstream side of the swirl flow forming passages 200b and 210b. At the time of the next fuel injection, the adhered or accumulated fuel is dispersed. There is a problem that the fuel particles are ejected as a lump of large-diameter particles, soot is generated due to an increase in penetration, or combustion becomes unstable.
【0013】また、特開平9−79108号公報に開示
の燃料噴射弁においては、弁体220が外開き式のた
め、上述のような着座位置より下流の領域に燃料が付着
することは防止できるものの、燃料噴射孔120aの外
側縁部領域にカーボン等が付着し、このカーボンが弁体
220の上下動等によりシール面領域に噛み込まれ、こ
れにより、テーパ部220aとシート面120aとの密
着が妨げられて、閉弁状態で燃料が漏れ出るという問題
があった。また、弁体220のテーパ部220aが着座
する位置よりも上流側でかつスワール流形成通路300
aの下流側の領域Bには、前述の従来技術同様、旋回力
を失った燃料が溜まり、次の燃料噴射の際に、この溜っ
た燃料が粒径の大きな燃料粒子の塊として噴出し、同様
にペネトレーションの増加等によるすすの発生あるいは
燃焼の不安定化を招くという問題があった。Further, in the fuel injection valve disclosed in Japanese Patent Application Laid-Open No. 9-79108, since the valve body 220 is of an outward opening type, it is possible to prevent fuel from adhering to a region downstream from the above-described seating position. However, carbon or the like adheres to the outer edge region of the fuel injection hole 120a, and the carbon is caught in the sealing surface region by the upward and downward movement of the valve body 220, so that the taper portion 220a and the seat surface 120a adhere to each other. And the fuel leaks when the valve is closed. Further, the swirl flow forming passage 300 is located on the upstream side of the position where the tapered portion 220a of the valve element 220 is seated.
Similar to the above-described conventional technology, the fuel that has lost the turning force accumulates in the area B on the downstream side of a, and at the time of the next fuel injection, the accumulated fuel is ejected as a mass of fuel particles having a large particle diameter, Similarly, there is a problem in that soot is generated or combustion is destabilized due to an increase in penetration.
【0014】本発明は、上記従来技術の問題点に鑑みて
成されたものであり、その目的とするところは、燃料の
噴射初期において燃料粒子の塊が噴出するのを防止する
ことで、燃料のペネトレーションの低減等を図り、すす
等の発生を抑制し、又、燃焼の安定化を図れる内燃機関
の燃料噴射弁を提供することにある。The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to prevent a lump of fuel particles from being ejected at an early stage of fuel injection, thereby providing a fuel. It is an object of the present invention to provide a fuel injection valve for an internal combustion engine capable of reducing the penetration of the fuel, suppressing the occurrence of soot, and stabilizing combustion.
【0015】[0015]
【課題を解決するための手段】本発明の請求項1に係る
内燃機関用燃料噴射弁は、略筒形状をなして燃料を導く
内部空間を形成すると共に一端部において燃料噴射孔及
び前記燃料噴射孔に続く内側領域にシート面を有する本
体ケースと、前記本体ケース内に往復動自在に配置され
かつ一端部において前記シート面に当接して前記本体ケ
ースの内部空間と前記燃料噴射孔との連通を遮断し得る
当接部を有する弁体と、前記本体ケース内の所定位置に
入口部を有しかつ前記当接部が前記シート面に当接する
領域よりも上流の位置に出口部を有する燃料通路を形成
する燃料通路形成部材とを備え、前記当接部が前記シー
ト面に当接した閉弁状態において前記燃料噴射孔からの
燃料の噴射を停止し、前記当接部が前記シート面から離
脱した開弁状態において前記燃料噴射孔から燃料を噴射
する内燃機関用燃料噴射弁であって、前記閉弁状態にお
いて前記本体ケースの内部空間と前記燃料通路との連通
を遮断し、かつ、前記弁体の開弁動作に伴なって少なく
とも前記燃料通路内の圧力を一時的に減圧させる通路遮
断減圧手段を有する、構成となっている。According to a first aspect of the present invention, there is provided a fuel injection valve for an internal combustion engine which has a substantially cylindrical shape to form an internal space for guiding fuel, and has a fuel injection hole and the fuel injection hole at one end. A main body case having a seat surface in an inner region following the hole, and a reciprocatingly disposed interior of the main body case and contacting the seat surface at one end to communicate the internal space of the main body case with the fuel injection hole. A valve body having a contact portion capable of shutting off, and a fuel having an inlet at a predetermined position in the main body case and an outlet at a position upstream of a region where the contact portion contacts the seat surface. A fuel passage forming member for forming a passage, wherein the abutting portion stops fuel injection from the fuel injection holes in a valve closed state in which the abutting portion abuts on the seat surface, and the abutting portion moves from the seat surface. In the opened valve state A fuel injection valve for an internal combustion engine that injects fuel from the fuel injection hole, wherein in the closed state, communication between the internal space of the main body case and the fuel passage is cut off, and the valve body is opened. The apparatus has a passage shut-off pressure reducing means for temporarily reducing at least the pressure in the fuel passage during operation.
【0016】本発明の請求項2に係る内燃機関用燃料噴
射弁は、請求項1に係る内燃機関用燃料噴射弁におい
て、前記通路遮断減圧手段が、前記弁体に対して一体的
に固定されかつ前記弁体の往復動方向において前記燃料
通路形成部材の上端面に対し当接及び離脱して前記燃料
通路の入口部を開閉する平板状部材である、構成となっ
ている。A fuel injection valve for an internal combustion engine according to a second aspect of the present invention is the fuel injection valve for an internal combustion engine according to the first aspect, wherein the passage blocking pressure reducing means is integrally fixed to the valve body. Further, it is a flat plate-shaped member which comes into contact with and separates from the upper end surface of the fuel passage forming member in the reciprocating direction of the valve body to open and close the inlet of the fuel passage.
【0017】本発明の請求項3に係る内燃機関用燃料噴
射弁は、請求項1に係る内燃機関用燃料噴射弁におい
て、前記燃料通路形成部材が、前記弁体の外周面に密接
して前記弁体を往復動自在に案内する案内孔と、前記案
内孔よりも径方向外側の領域でかつ前記弁体の往復動方
向上流側に向けて開口するように形成された前記入口部
とを有し、前記通路遮断減圧手段が、前記弁体に対して
一体的に固定されかつ前記弁体の径方向において前記入
口部よりも外側の領域まで広がると共に前記弁体の往復
動方向において前記燃料通路の入口部を開閉する略円形
の平板状部材を有し、前記平板状部材と前記燃料通路形
成部材とが、前記入口部よりも径方向外側の全周領域に
おいて、前記弁体の開弁動作による所定移動距離の間
中、径方向においてお互いに密接に接触し続けるような
環状接触部を有する、構成となっている。According to a third aspect of the present invention, there is provided a fuel injection valve for an internal combustion engine according to the first aspect, wherein the fuel passage forming member is in close contact with an outer peripheral surface of the valve body. A guide hole for reciprocatingly guiding the valve element, and the inlet formed to be open in a region radially outside the guide hole and upstream in the reciprocating direction of the valve element. The passage blocking pressure reducing means is integrally fixed to the valve body and extends to a region outside the inlet in the radial direction of the valve body, and the fuel passage extends in a reciprocating direction of the valve body. A substantially circular plate-shaped member that opens and closes an inlet portion of the valve body, and wherein the plate-shaped member and the fuel passage forming member are arranged to open the valve body in an entire circumferential area radially outside the inlet portion. In the radial direction throughout the specified travel distance Having a contact ring, such as remain in intimate contact with the stomach, has a configuration.
【0018】本発明の請求項4に係る内燃機関用燃料噴
射弁は、請求項1に係る内燃機関用燃料噴射弁におい
て、前記燃料通路形成部材が、前記弁体の外周面に密接
して前記弁体を往復動自在に案内する案内孔と、前記案
内孔よりも径方向外側の領域でかつ前記弁体の往復動方
向上流側に向けて開口するように形成された前記入口部
とを有し、前記通路遮断減圧手段が、前記弁体に対して
一体的に固定されかつ前記弁体の径方向において前記入
口部よりも外側の領域まで広がると共に前記弁体の往復
動方向において前記燃料通路の入口部を開閉する略円形
の平板状部材を有し、前記平板状部材と前記燃料通路形
成部材との間には、前記弁体の径方向において前記入口
部よりも外側の領域に位置付けられた環状弾性シール部
材を有し、前記環状弾性シール部材が、前記弁体の開弁
動作による所定移動距離の間中、前記弁体の往復動方向
において前記平板状部材下面及び燃料通路形成部材上面
に密接に接触し続けるように配置されている、構成とな
っている。According to a fourth aspect of the present invention, there is provided the fuel injection valve for an internal combustion engine according to the first aspect, wherein the fuel passage forming member is in close contact with an outer peripheral surface of the valve body. A guide hole for reciprocatingly guiding the valve element, and the inlet formed to be open in a region radially outside the guide hole and upstream in the reciprocating direction of the valve element. The passage blocking pressure reducing means is integrally fixed to the valve body and extends to a region outside the inlet in the radial direction of the valve body, and the fuel passage extends in a reciprocating direction of the valve body. A substantially circular plate-shaped member that opens and closes an inlet portion of the valve body, and is positioned in a region outside the inlet portion in the radial direction of the valve element between the plate-shaped member and the fuel passage forming member. An annular elastic seal member, The seal member is disposed so as to keep in close contact with the lower surface of the flat member and the upper surface of the fuel passage forming member in the reciprocating direction of the valve during a predetermined movement distance due to the valve opening operation of the valve. It has a configuration.
【0019】本発明の請求項5に係る内燃機関用燃料噴
射弁は、請求項1に係る内燃機関用燃料噴射弁におい
て、前記燃料通路形成部材が、前記弁体の外周面に密接
して前記弁体を往復動自在に案内する案内孔と、前記案
内孔よりも径方向外側の領域でかつ前記弁体の往復動方
向上流側に向けて開口するように形成された前記入口部
とを有し、前記通路遮断減圧手段が、略中央部が前記弁
体の外周部に密接に固定されると共に凹面が前記燃料通
路形成部材に対向するようにかつ外周縁部が前記入口部
よりも径方向外側の領域において前記燃料通路形成部材
の上端面に密接に接触し得るように形成されたパラボラ
状弾性シール部材を有し、前記パラボラ状弾性シール部
材が、閉弁状態において略中央部が前記燃料通路形成部
材に近づく方向に変形した状態で保持され、かつ、前記
弁体の開弁動作による所定移動距離の間中、前記外周縁
部が前記燃料通路形成部材の上端面に密接に接続し続け
るように配置されている、構成となっている。The fuel injection valve for an internal combustion engine according to claim 5 of the present invention is the fuel injection valve for internal combustion engine according to claim 1, wherein the fuel passage forming member is in close contact with an outer peripheral surface of the valve body. A guide hole for reciprocatingly guiding the valve element, and the inlet formed to be open in a region radially outside the guide hole and upstream in the reciprocating direction of the valve element. The passage blocking and depressurizing means has a substantially central portion closely fixed to an outer peripheral portion of the valve body and a concave surface facing the fuel passage forming member, and an outer peripheral edge portion is radially larger than the inlet portion. A parabolic elastic seal member formed so as to be able to come into close contact with an upper end surface of the fuel passage forming member in an outer region; Change in the direction approaching the passage forming member And the outer peripheral edge portion is disposed so as to continue to be closely connected to the upper end surface of the fuel passage forming member during a predetermined movement distance due to the valve opening operation of the valve body. It has become.
【0020】[0020]
【発明の効果】本発明の請求項1に係る内燃機関用燃料
噴射弁によれば、弁体の当接部がシート面から離脱する
ように、すなわち、弁体が開弁動作を始めると、この開
弁動作に伴なって、通路遮断減圧手段により、少なくと
も燃料通路内の圧力が一時的に減圧される。According to the fuel injection valve for an internal combustion engine according to the first aspect of the present invention, when the contact portion of the valve element is separated from the seat surface, that is, when the valve element starts the valve opening operation, Along with this valve opening operation, at least the pressure in the fuel passage is temporarily reduced by the passage blocking pressure reducing means.
【0021】この際、開弁状態において当接部がシート
面に着座する着座領域よりも下流側の領域に付着してい
た燃料(以下、外側付着燃料と称す)及び着座領域より
も上流でかつ燃料通路の出口部よりも下流に溜っていた
燃料(以下、内側溜り燃料と称す)が、上記減圧作用に
より燃料通路内すなわち上流側に向けて一時的に吸い戻
されることになる。At this time, in the valve-opened state, the abutting portion is attached to a region downstream of the seating region where the seating portion is seated on the seat surface (hereinafter referred to as “outside adhered fuel”) and upstream of the seating region. The fuel that has accumulated downstream of the outlet of the fuel passage (hereinafter referred to as the inner accumulated fuel) is temporarily sucked back into the fuel passage, that is, toward the upstream side by the above-described depressurizing action.
【0022】その後、燃料が満たされた本体ケースの内
部空間と燃料通路とが完全に連通すると同時に、高圧の
燃料が、吸い戻された燃料を巻き込んで燃料通路を通っ
て燃料噴射孔から一気に噴射されることになる。Thereafter, the internal space of the main body case filled with fuel is completely connected to the fuel passage, and at the same time, the high-pressure fuel is entrained by the sucked-back fuel and is injected at once from the fuel injection hole through the fuel passage. Will be done.
【0023】従って、噴射初期において、燃料粒子の大
きい塊が噴射されるのを防止できる。これにより、噴射
燃料の微粒化が促進され、又、実質的に噴射される燃料
量のばらつきが抑制され、すす等の発生を抑制でき、
又、燃焼の安定化、排気性能の改善等を達成することが
できる。Accordingly, it is possible to prevent large lumps of fuel particles from being injected at the beginning of the injection. Thereby, the atomization of the injected fuel is promoted, and the variation in the amount of injected fuel is substantially suppressed, and the occurrence of soot and the like can be suppressed.
Further, stabilization of combustion, improvement of exhaust performance, and the like can be achieved.
【0024】本発明の請求項2に係る内燃機関用燃料噴
射弁によれば、弁体の当接部がシート面から離脱するよ
うに、すなわち、弁体が開弁方向に移動を始めると、燃
料通路の入口部を閉塞していた平板状部材もこの弁体と
共に移動を始める。この際、この平板状部材の移動によ
り、燃料通路内の圧力が一時的に低下し、この燃料通路
に連通する着座領域よりも下流の通路に付着していた外
側付着燃料及び着座領域よりも上流側の内側溜り燃料が
上流側に向けて吸い戻されることになる。According to the fuel injection valve for an internal combustion engine according to claim 2 of the present invention, when the contact portion of the valve element is separated from the seat surface, that is, when the valve element starts moving in the valve opening direction, The flat plate member closing the inlet of the fuel passage also starts to move together with the valve body. At this time, due to the movement of the flat plate member, the pressure in the fuel passage is temporarily reduced, and the outer adhering fuel and the seated region that have adhered to the passage downstream of the seated region communicating with the fuel passage are upstream of the seated region. Will be sucked back toward the upstream side.
【0025】その後、上記減圧作用が弱まった段階で、
高圧の燃料が燃料通路を通って燃料噴射孔から一気に噴
射されることになる。After that, when the above-mentioned depressurizing action is weakened,
High-pressure fuel is injected at once from the fuel injection hole through the fuel passage.
【0026】従って、噴射初期において、燃料粒子の大
きい塊が噴射されるのを防止できる。これにより、噴射
燃料の微粒化、実質的な燃料噴射量のばらつきの抑制等
が行なわれ、すす等発生量の低減、燃焼の安定化、排気
性能の改善等を達成することができる。Accordingly, it is possible to prevent large lumps of fuel particles from being injected at the beginning of the injection. As a result, atomization of the injected fuel, suppression of a substantial variation in the fuel injection amount, and the like are performed, and it is possible to achieve a reduction in the amount of soot and the like, a stable combustion, an improvement in exhaust performance, and the like.
【0027】また、減圧作用を生じさせる通路遮断減圧
手段として、弁体と一体的に移動する平板状部材を採用
することから、簡略な構造にして、弁体の開弁動作と確
実に同期した減圧作用を生じさせることができる。これ
により、装置の簡略化を達成しつつ、機能上の信頼性を
確保することができる。Further, since a plate-like member which moves integrally with the valve element is adopted as the passage blocking pressure reducing means for generating the pressure reducing function, the structure is simplified and the valve opening operation of the valve element is reliably synchronized. A decompression effect can be produced. Thus, functional reliability can be ensured while achieving simplification of the device.
【0028】本発明の請求項3に係る内燃機関用燃料噴
射弁によれば、弁体の当接部がシート面から離脱するよ
うに、すなわち、弁体が開弁方向に移動を始めると、燃
料通路の入口部を閉塞していた平板状部材もこの弁体と
共に移動を始めて入口部を開放する。According to the fuel injection valve for an internal combustion engine according to the third aspect of the present invention, when the contact portion of the valve element is separated from the seat surface, that is, when the valve element starts moving in the valve opening direction, The plate-like member closing the inlet of the fuel passage also starts to move with this valve body to open the inlet.
【0029】そして、弁体の移動に伴なって、平板状部
材が所定の距離を移動する間中は、環状接触部により、
燃料が満たされた本体ケースの内部空間と燃料通路との
連通が遮断された状態のまま、平板状部材,燃料通路形
成部材等により囲まれた密閉空間が入口部に連通した状
態で増大することになる。During the movement of the plate member by a predetermined distance along with the movement of the valve body, the annular contact portion provides
The sealed space surrounded by the plate-shaped member, the fuel passage forming member, etc., increases in a state where the communication between the inner space of the main body case filled with fuel and the fuel passage is interrupted and the inlet portion communicates with the fuel passage. become.
【0030】この密閉空間の増大により、燃料通路内の
減圧作用をより一層増加させることができ、着座領域よ
りも下流に付着した外側付着燃料及び着座領域よりも上
流側に溜った内側溜り燃料をより一層確実に吸い戻すこ
とができる。By increasing the sealed space, the pressure reducing action in the fuel passage can be further increased, and the outer adhering fuel adhering downstream from the seating area and the inner pooled fuel accumulating upstream from the seating area can be removed. It can be sucked back more reliably.
【0031】従って、噴射初期において、燃料粒子の大
きい塊が噴射されるのをより一層確実に防止できる。こ
れにより、噴射燃料の微粒化、実質的な燃料噴射量のば
らつきの抑制等がより一層確実に行なわれ、すす等の発
生量のより一層の低減、燃焼のより一層の安定化、排気
性能のより一層の改善等を達成することができる。Therefore, it is possible to more reliably prevent the injection of a large lump of fuel particles at the beginning of the injection. As a result, the atomization of the injected fuel, the suppression of the substantial variation in the fuel injection amount, etc., are performed more reliably, the generation amount of soot and the like is further reduced, the combustion is further stabilized, and the exhaust performance is improved. Further improvements and the like can be achieved.
【0032】本発明の請求項4に係る内燃機関用燃料噴
射弁によれば、弁体の当接部がシート面から離脱するよ
うに、すなわち、弁体が開弁方向に移動を始めると、燃
料通路の入口部を閉塞していた平板状部材もこの弁体と
共に移動を始めて入口部を開放する。According to the fuel injection valve for an internal combustion engine according to claim 4 of the present invention, when the contact portion of the valve element is separated from the seat surface, that is, when the valve element starts moving in the valve opening direction, The plate-like member closing the inlet of the fuel passage also starts to move with this valve body to open the inlet.
【0033】そして、弁体の移動に伴なって平板状部材
が所定の距離を移動する間中、すなわち、平板状部材と
燃料通路形成部材との間において圧縮された状態にあっ
た環状弾性シール部材が完全に弾性復帰するまでの間
中、燃料が満たされた本体ケースの内部空間と燃料通路
との連通が遮断された状態のまま、平板状部材,燃料通
路形成部材,環状弾性シール部材等により囲まれた密閉
空間が入口部に連通した状態で増大することになる。The annular elastic seal is in a state of being compressed while the flat member moves a predetermined distance with the movement of the valve body, that is, between the flat member and the fuel passage forming member. Until the member is completely elastically restored, the flat space member, the fuel passage forming member, the annular elastic seal member, etc. are kept in a state where the communication between the fuel passage and the inner space of the main body case filled with fuel is cut off. Is increased in a state where the closed space surrounded by is communicated with the entrance.
【0034】この密閉空間の増大により、前述同様燃料
通路内の減圧作用をより一層増加させることができ、着
座領域よりも下流に付着していた外側付着燃料及び着座
領域よりも上流側に溜っていた内側溜り燃料をより一層
確実に吸い戻すことができる。As described above, the pressure reduction action in the fuel passage can be further increased by the increase in the sealed space, and the fuel deposited outside the seating region and accumulated outside the seating region upstream from the seating region. The inner pool fuel can be sucked back more reliably.
【0035】従って、噴射初期において、前述同様燃料
粒子の大きい塊が噴射されるのをより一層確実に防止で
きる。これにより、噴射燃料の微粒化、実質的な燃料噴
射量のばらつきの抑制等がより一層確実に行なわれ、す
す等の発生量のより一層の低減、燃焼のより一層の安定
化、排気性能のより一層の改善等を達成することができ
る。Accordingly, in the early stage of the injection, it is possible to more reliably prevent the injection of a large lump of fuel particles as in the case described above. As a result, the atomization of the injected fuel, the suppression of the substantial variation in the fuel injection amount, etc., are performed more reliably, the generation amount of soot and the like is further reduced, the combustion is further stabilized, and the exhaust performance is improved. Further improvements and the like can be achieved.
【0036】本発明の請求項5に係る内燃機関用燃料噴
射弁によれば、弁体の当接部がシート面から離脱するよ
うに、すなわち、弁体が開弁方向に移動を始めると、燃
料通路形成部材の上端面に外周縁部が接触して燃料通路
の入口部を覆うように位置付けられていたパラボラ状弾
性シール部材の中央部もこの弁体と共に移動を始める。
この際、パラボラ状弾性シール部材は、閉弁状態におい
てその中央部が予め弾性変形した状態となっているた
め、この弾性変形が完全に復帰するまでは、外周縁部は
燃料通路形成部材の上端面に密接に接触しており、この
弾性復帰の間中、燃料が満たされた本体ケースの内部空
間と燃料通路との連通が遮断された状態のまま、パラボ
ラ状弾性シール部材,燃料通路形成部材等により囲まれ
た密閉空間が入口部に連通した状態で増大することにな
る。According to the fuel injection valve for an internal combustion engine according to the fifth aspect of the present invention, when the contact portion of the valve element is separated from the seat surface, that is, when the valve element starts moving in the valve opening direction, The central portion of the parabolic elastic seal member positioned so that the outer peripheral edge portion contacts the upper end surface of the fuel passage forming member and covers the inlet portion of the fuel passage also starts to move together with the valve body.
At this time, since the central portion of the parabolic elastic seal member is elastically deformed in advance in the valve-closed state, the outer peripheral edge remains above the fuel passage forming member until the elastic deformation is completely restored. The parabolic elastic seal member and the fuel passage forming member are in close contact with the end face, and during this elastic return, the communication between the fuel passage and the internal space of the main body case filled with fuel is cut off. The enclosed space surrounded by the like increases in a state where it communicates with the entrance.
【0037】この密閉空間の増大により、前述同様燃料
通路内の減圧作用をより一層増加させることができ、着
座領域よりも下流に付着していた外側付着燃料及び着座
領域よりも上流側に溜っていた内側溜り燃料をより一層
確実に吸い戻すことができる。As described above, the pressure reduction effect in the fuel passage can be further increased by the increase in the sealed space, and the fuel deposited outside of the seating region and the fuel deposited outside and accumulated upstream of the seating region. The inner pool fuel can be sucked back more reliably.
【0038】従って、噴射初期において、前述同様燃料
粒子の大きい塊が噴射されるのをより一層確実に防止で
きる。これにより、噴射燃料の微粒化、実質的な燃料噴
射量のばらつきの抑制等がより一層確実に行なわれ、す
す等の発生量のより一層の低減、燃焼のより一層の安定
化、排気性能のより一層の改善等を達成することができ
る。Therefore, in the early stage of the injection, injection of a large lump of fuel particles can be more reliably prevented as in the case described above. As a result, the atomization of the injected fuel, the suppression of the substantial variation in the fuel injection amount, etc., are performed more reliably, the generation amount of soot and the like is further reduced, the combustion is further stabilized, and the exhaust performance is improved. Further improvements and the like can be achieved.
【0039】[0039]
【発明の実施の形態】以下、本発明の実施例について添
付図面に基づき説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【0040】図1及び図2は、本発明に係る内燃機関用
燃料噴射弁の第1の実施例を示す概略構成図である。本
実施例に係る内燃機関用燃料噴射弁は、図1及び図2に
示すように、略筒形状をなして燃料を導く内部空間Sを
形成すると共に一端部において燃料噴射孔10a及び燃
料噴射孔10aに続く内側領域に略円錐形状のシート面
10bを有する本体ケース10と、本体ケース10内に
往復動自在に配置されかつ一端部においてシート面10
bに当接して本体ケース10の内部空間Sと燃料噴射孔
10aとの連通を遮断し得る略円錐台形状の当接部20
aを有する弁体20と、本体ケース10内の所定位置に
入口部31aを有しかつ当接部20aがシート面10b
に当接する領域、すなわち、着座領域Mよりも上流の位
置に出口部31bを有する燃料通路31を形成する燃料
通路形成部材30と、閉弁状態において本体ケース10
の内部空間Sと燃料通路31との連通を遮断しかつ弁体
20の開弁動作に伴なって少なくとも燃料通路31内の
圧力を一時的に減圧させる通路遮断減圧手段としての弁
体20に一体的に固定された平板状部材21と、弁体2
0に一体的に設けられた傘部22が当接することで弁体
20の開弁移動を所定範囲に規制するストッパ11と、
開弁時に通電励磁により弁体20を開弁方向へ移動させ
る電磁コイル及びアーマチャ(不図示)と、閉弁時に弁
体を休止位置に復帰させるリターンスプリング(不図
示)等を基本構成として備えている。FIGS. 1 and 2 are schematic structural views showing a first embodiment of a fuel injection valve for an internal combustion engine according to the present invention. As shown in FIGS. 1 and 2, the fuel injection valve for an internal combustion engine according to the present embodiment has a substantially cylindrical shape, forms an internal space S for guiding fuel, and has a fuel injection hole 10a and a fuel injection hole 10 at one end. A main body case 10 having a substantially conical seat surface 10b in an inner region following the main surface 10a;
b, a contact portion 20 having a substantially frusto-conical shape capable of blocking communication between the internal space S of the main body case 10 and the fuel injection hole 10a.
a, and an inlet portion 31a at a predetermined position in the main body case 10 and the contact portion 20a is connected to the seat surface 10b.
, That is, a fuel passage forming member 30 forming a fuel passage 31 having an outlet portion 31b at a position upstream of the seating region M, and a main body case 10 in a valve closed state.
Of the fuel passage 31 and the valve body 20 as a passage blocking pressure reducing means for temporarily reducing at least the pressure in the fuel passage 31 with the valve opening operation of the valve body 20. Fixed plate member 21 and valve body 2
A stopper 11 for restricting the valve-opening movement of the valve body 20 to a predetermined range by contacting an umbrella portion 22 provided integrally with the stopper 11;
An electromagnetic coil and an armature (not shown) for moving the valve body 20 in the valve opening direction by energization when the valve is opened, and a return spring (not shown) for returning the valve body to the rest position when the valve is closed are provided as basic components. I have.
【0041】上記燃料通路形成部材30は、略円柱形状
の輪郭をなし、その中央部において、弁体20の外周面
と密接して弁体20をその軸線方向に往復動自在に案内
する案内孔30bが形成され、又、端面30a上におい
て、案内孔30bよりも径方向外側の領域でかつ周方向
均等の位置に入口部31aが開口し、かつ、案内孔30
bの内壁面に出口部31bが開口する4本の燃料通路3
1が形成されている。The fuel passage forming member 30 has a substantially cylindrical contour, and has a guide hole at a center portion thereof, which is in close contact with the outer peripheral surface of the valve body 20 and guides the valve body 20 to reciprocate in the axial direction thereof. 30b is formed, and on the end face 30a, an entrance portion 31a is opened at a position radially outside the guide hole 30b and at a position equivalent to the circumferential direction, and the guide hole 30b is formed.
b, four fuel passages 3 having an outlet portion 31b opened on the inner wall surface
1 is formed.
【0042】さらに、この燃料通路31は、その出口部
31b側寄りの通路部分が、案内孔30bの接線方向に
伸長しており、又、出口部31bは、弁体20の当接部
20aが本体ケース10のシート面10bに当接する着
座領域Mよりも上流の位置にて開口している。Further, the fuel passage 31 has a passage portion near the outlet portion 31b side extending in a tangential direction of the guide hole 30b, and the outlet portion 31b is provided with a contact portion 20a of the valve body 20. The opening is provided at a position upstream of the seating area M which is in contact with the seat surface 10b of the main body case 10.
【0043】ここで、上記のような燃料通路とするの
は、開弁時において、この燃料通路31内を流れてきた
燃料が、出口部31bから噴出する際にスワール流を形
成するようにするためのものである。Here, the fuel passage as described above is such that when the valve is opened, the fuel flowing through the fuel passage 31 forms a swirl flow when it is ejected from the outlet 31b. It is for.
【0044】また、上記燃料通路形成部材30は、その
外周面が本体ケース10の内周面と密接した状態で固定
されており、燃料が、この外周面と内周面との間を流れ
ないようになっている。The fuel passage forming member 30 is fixed in a state where its outer peripheral surface is in close contact with the inner peripheral surface of the main body case 10, so that fuel does not flow between the outer peripheral surface and the inner peripheral surface. It has become.
【0045】尚、上記燃料通路形成部材30は、本体ケ
ース10とは別体のものとして形成したが、上記燃料通
路31等の加工が可能である限り、本体ケース10と一
体のものとしてもよい。Although the fuel passage forming member 30 is formed separately from the main body case 10, it may be integrated with the main body case 10 as long as the fuel passage 31 and the like can be processed. .
【0046】次に、本実施例に係る内燃機関用燃料噴射
弁の動作について説明する。Next, the operation of the fuel injection valve for an internal combustion engine according to this embodiment will be described.
【0047】燃料を噴射しない閉弁状態すなわち休止状
態においては、図3(a)に示すように、弁体20の当
接部20a外周面がシート面10bに密接に当接して、
内部空間Sと外部に通じる燃料噴射孔10aとの連通を
遮断している。この状態において、当接部20aがシー
ト面10bに当接する着座領域Mの下流側には、前行程
で噴射された燃料の一部が大きな塊として付着して、外
側付着燃料F1を形成している。また、着座領域Mの上
流側でかつ燃料通路31の出口31bよりも下流側に
は、旋回力を失った燃料が溜って、内側溜り燃料F2を
形成している。In the closed state where fuel is not injected, that is, in the rest state, as shown in FIG. 3 (a), the outer peripheral surface of the contact portion 20a of the valve body 20 comes into close contact with the seat surface 10b.
The communication between the internal space S and the fuel injection hole 10a communicating with the outside is blocked. In this state, the downstream side of the seating region M where the abutting portion 20a abuts against the seat surface 10b, before adhering part of the fuel injected by the stroke as large lumps, to form an outer adhering fuel F 1 ing. Further, on the downstream side of the outlet 31b of and the fuel passage 31 upstream of the seating region M is fuel that has lost the turning force is accumulated to form the inner reservoir fuel F 2.
【0048】ここで、燃料噴射開始信号が発せられる
と、励磁作用により、図3(b)に示すように、弁体2
0が開弁方向(U方向)に移動し始める。これに同期し
て、燃料通路形成部材30の端面30aに密接して入口
部31aを閉塞していた平板状部材21も、弁体20と
共に移動し始め、入口部31aを開放する。この際、弁
体20すなわち平板状部材21の移動は瞬時に行なわれ
るため、平板状部材21の端面21aから燃料通路31
内に通じる空間が、吸引作用により一時的に減圧された
状態となる。と同時に、当接部20aもシート面10b
から離脱して、隙間が形成されていることから、着座領
域の下流側に付着していた外側付着燃料F1の塊及び着
座領域より上流側に溜っていた内側溜り燃料F2は、一
般的に燃料通路31内に向けて吸い戻される。Here, when the fuel injection start signal is issued, the valve body 2 is excited by the exciting action as shown in FIG.
0 starts moving in the valve opening direction (U direction). In synchronization with this, the flat plate-shaped member 21 which has been in close contact with the end face 30a of the fuel passage forming member 30 and has closed the inlet portion 31a also starts to move together with the valve body 20 and opens the inlet portion 31a. At this time, since the movement of the valve element 20, that is, the flat plate member 21 is performed instantaneously, the fuel passage 31 is moved from the end surface 21a of the flat plate member 21.
The space leading to the inside is temporarily decompressed by the suction action. At the same time, the contact portion 20a also has a seat surface 10b.
Disengaged from, since the gap is formed, the inner reservoir fuel F 2 which has accumulated on the upstream side of the mass and the seating area of the outer adhering fuel F 1 adhering to the downstream side of the seating area, generally Is sucked back into the fuel passage 31.
【0049】その後、弁体20が停止して上記吸引作用
あるいは減圧作用が消滅すると同時に、内部空間Sに満
たされた高圧の燃料が、燃料通路31を通り、吸い戻さ
れた燃料を巻き込んだ状態で出口部31bからスワール
流として噴出し、燃料噴射孔10aから一気に噴射され
る。Thereafter, the valve element 20 stops and the above-mentioned suction or depressurizing action disappears, and at the same time, the high-pressure fuel filled in the internal space S passes through the fuel passage 31 and entrains the sucked-back fuel. At the outlet portion 31b as a swirl flow, and is injected at once from the fuel injection hole 10a.
【0050】従って、噴射初期において、燃料粒子の大
きい塊が噴射されることなく、噴射燃料の微粒化、実質
的な燃料噴射量のばらつきの抑制等が行なわれることに
なり、特に、燃料を直接筒内に噴射する内燃機関の場合
は、すす等の発生量が低減し、燃焼が安定し、排気性能
等が改善される。Therefore, in the early stage of the injection, atomization of the injected fuel, suppression of substantial variation in the fuel injection amount, and the like are performed without injecting large lumps of fuel particles. In the case of an internal combustion engine that injects fuel into a cylinder, the amount of soot and the like is reduced, combustion is stabilized, and exhaust performance and the like are improved.
【0051】図4は、本発明に係る内燃機関用燃料噴射
弁の第2の実施例を示す概略構成図である。本実施例で
は、通路遮断減圧としての平板状部材23の一部が、燃
料通路形成部材30の端面30aに形成された凹部に嵌
合する構成となっている以外は、前述第1の実施例と同
様である。FIG. 4 is a schematic diagram showing a second embodiment of the fuel injection valve for an internal combustion engine according to the present invention. In the present embodiment, the first embodiment is the same as the first embodiment except that a part of the plate-shaped member 23 as the passage cut-off depressurization is configured to fit into the recess formed in the end face 30 a of the fuel passage forming member 30. Is the same as
【0052】すなわち、本実施例において、平板状部材
23は、外形が円形形状をなし、燃料通路形成部材30
と対向する側において、外周縁部が縮径された柱状凸部
23aを有しており、一方、燃料通路形成部材30は、
端面30aにおいて、上記柱状凸部23aを密接に嵌合
させ得る柱状凹部32を有しており、この柱状凹部32
の底面上に燃料通路31の入口部31aが開口してい
る。この柱状凸部23aの外周面と柱状凹部32の内周
面とが、燃料通路31の入口部31aよりも径方向外側
の全周領域において、弁体20が開弁方向に所定距離移
動する間中、径方向においてお互いに密接に接触し続け
る環状接触部を形成している。That is, in this embodiment, the flat member 23 has a circular outer shape and the fuel passage forming member 30
Has a columnar convex portion 23a whose outer peripheral edge portion is reduced in diameter, while the fuel passage forming member 30
The end surface 30a has a columnar concave portion 32 that can fit the columnar convex portion 23a closely.
The inlet 31a of the fuel passage 31 is open on the bottom surface of the fuel passage 31. While the outer peripheral surface of the columnar convex portion 23a and the inner peripheral surface of the columnar concave portion 32 are moved by a predetermined distance in the valve opening direction in the entire peripheral region radially outside the inlet portion 31a of the fuel passage 31. It forms an annular contact portion that keeps in close contact with each other in the middle and radial directions.
【0053】次に、本実施例に係る内燃機関用燃料噴射
弁の動作について説明する。燃料を噴射しない閉弁状態
すなわち休止状態においては、図5(a)に示すよう
に、弁体20の当接部20a外周面がシート面10bに
密接に当接して、内部空間Sと外部に通じる燃料噴射孔
10aとの連通を遮断している。この状態において、当
接部20aがシート面10bに当接する着座領域Mの下
流側及び上流側には、前行程で噴射された燃料の一部で
ある外側付着燃料F1及び内側溜り燃料F2が残留して
いる。Next, the operation of the fuel injection valve for an internal combustion engine according to this embodiment will be described. In the valve closed state in which fuel is not injected, that is, in the rest state, as shown in FIG. 5A, the outer peripheral surface of the contact portion 20a of the valve body 20 comes into close contact with the seat surface 10b, and The communication with the fuel injection hole 10a is cut off. In this state, the downstream side and the upstream side of the seating area M of contact portion 20a comes into contact with the seat surface 10b is outside deposition is part of the fuel injected in the pre-stroke fuel F 1 and the inner reservoir fuel F 2 Remains.
【0054】ここで、燃料噴射開始信号が発せられる
と、励磁作用により、図5(b)に示すように、弁体2
0が開弁方向(U方向)に移動し始める。これに同期し
て、燃料通路形成部材30の柱状凹部32に柱状凸部2
3aが密接に嵌合して入口部31aを閉塞していた平板
状部材23も、弁体20と共に移動し始め、入口部31
aを開放する。Here, when the fuel injection start signal is issued, the valve body 2 is excited by the exciting action as shown in FIG.
0 starts moving in the valve opening direction (U direction). In synchronization with this, the columnar projections 2 are
The plate-like member 23 into which the inlet 3a is tightly fitted and closes the inlet 31a also starts to move together with the valve element 20, and the inlet 31
Release a.
【0055】そして、弁体20の移動に伴なって、平板
状部材23が所定以上の距離を移動するまでは、環状接
触部である柱状凸部23aの外周面と柱状凹部32の内
周面との密接な接触が保持され、燃料が満たされた本体
ケース10の内部空間Sと燃料通路31との連通が遮断
された状態のまま、平板状部材23,燃料通路形成部材
30等により囲まれた密閉空間Vが入口部31aに連通
した状態で増大し続ける。Until the plate member 23 moves a predetermined distance or more with the movement of the valve body 20, the outer peripheral surface of the columnar convex portion 23a, which is an annular contact portion, and the inner peripheral surface of the columnar concave portion 32. In close contact with the fuel passage 31 and the internal space S of the main body case 10 filled with fuel and the fuel passage 31 are closed. The sealed space V continues to increase while communicating with the entrance 31a.
【0056】この際、弁体20すなわち平板状部材23
の移動は瞬時に行なわれるため、上記密閉空間Vの増大
が続く限り、燃料通路31内空間が吸引作用により一時
的に減圧された状態となる。と同時に、当接部20aも
シート面10bから離脱して、隙間が形成されているこ
とから、着座領域Mの下流側及び上流側に残留していた
外側付着燃料F1及び内側溜り燃料F2は、一時的に燃
料通路31内に向けてより一層強力に吸い戻される。At this time, the valve body 20, that is, the plate-like member 23
Is carried out instantaneously, so that the space in the fuel passage 31 is temporarily reduced in pressure by the suction action as long as the above-mentioned sealed space V continues to increase. At the same time, the contact portion 20a is also disengaged from the seat surface 10b, since the gap is formed, the outer remaining on the downstream side and the upstream side of the seating region M adhering fuel F 1 and the inner reservoir fuel F 2 Is temporarily more strongly sucked back into the fuel passage 31.
【0057】その後、柱状凸部23aが柱状凹部32か
ら離脱して、上記吸引作用あるいは減圧作用が消滅し、
弁体20が停止すると同時に、内部空間Sに満たされた
高圧の燃料が、燃料通路31を通り、吸い戻された燃料
F1,F2を巻き込んだ状態で出口部31bからスワー
ル流として噴出し、燃料噴射孔10aから一気に噴射さ
れる。Thereafter, the columnar convex portion 23a separates from the columnar concave portion 32, and the above-mentioned suction action or decompression action disappears.
At the same time as the valve body 20 stops, the high-pressure fuel filled in the internal space S passes through the fuel passage 31 and is ejected as a swirl flow from the outlet portion 31b in a state in which the sucked back fuel F 1 and F 2 are involved. The fuel is injected at once from the fuel injection holes 10a.
【0058】従って、噴射初期において、燃料粒子の大
きい塊が噴射されることなく、噴射燃料の微粒化、実質
的な燃料噴射量のばらつきの抑制等が行われることにな
り、特に、燃料を直接筒内に噴射する内燃機関の場合
は、すす等の発生量が低減し、燃焼が安定し、排気性能
等が改善される。Therefore, in the early stage of injection, atomization of the injected fuel and suppression of substantial variation in the fuel injection amount are performed without injecting large lumps of fuel particles. In the case of an internal combustion engine that injects fuel into a cylinder, the amount of soot and the like is reduced, combustion is stabilized, and exhaust performance and the like are improved.
【0059】図6は、図5に示す実施例に類似した第3
の実施例を示す概略構成図である。本実施例では、通路
遮断減圧手段としての平板状部材24の一部が、燃料通
路形成部材30の上端面に形成された凹部に嵌合すると
ともに、平板状部材24の下面に形成された凹部に燃料
通路形成部材30の上端面に形成された凸部が嵌合する
構成となっている以外は、前述第1の実施例と同様であ
る。FIG. 6 shows a third embodiment similar to the embodiment shown in FIG.
It is a schematic structure figure showing an example of. In the present embodiment, a part of the flat plate member 24 as the passage blocking and depressurizing means fits into the concave portion formed on the upper end surface of the fuel passage forming member 30 and the concave portion formed on the lower surface of the flat plate member 24. The configuration is the same as that of the first embodiment, except that a protrusion formed on the upper end surface of the fuel passage forming member 30 is fitted into the second embodiment.
【0060】すなわち、本実施例において、平板状部材
24は、外形が円形形状をなし、燃料通路形成部材30
と対向する側において外周縁部が突出した環状凸部24
aを有しており、一方、燃料通路形成部材30は、上端
面30aにおいて、上記環状凸部24aを密接に嵌合さ
せ得る環状凹部33を有しており、この環状凹部33の
領域に燃料通路31の入口部31aが開口している。こ
の環状凸部24aの外周面と環状凹部33の外側内壁面
とが、燃料通路31の入口部31aよりも径方向外側の
全周領域において、弁体20が開弁方向に所定距離移動
する間中、径方向においてお互い密接に接触し続ける環
状接触部を形成している。That is, in this embodiment, the flat member 24 has a circular outer shape and the fuel passage forming member 30
Annular convex portion 24 whose outer peripheral edge protrudes on the side opposite to
On the other hand, the fuel passage forming member 30 has an annular concave portion 33 on the upper end surface 30a to which the annular convex portion 24a can be fitted tightly. The entrance 31a of the passage 31 is open. The outer peripheral surface of the annular convex portion 24a and the outer inner wall surface of the annular concave portion 33 move while the valve body 20 moves a predetermined distance in the valve opening direction in the entire radial region outside the inlet portion 31a of the fuel passage 31. It forms an annular contact portion that keeps in close contact with each other in the middle and radial directions.
【0061】また、燃料通路31の入口部31aよりも
径方向内側の領域において、燃料通路形成部材30は、
その上端面30aから突出する第2の環状凸部34を有
しており、一方、平板状部材24の下面には、上記第2
の環状凸部34を嵌合させ得る第2の環状凹部24bを
有している。In a region radially inside the inlet portion 31a of the fuel passage 31, the fuel passage forming member 30 is
It has a second annular projection 34 projecting from its upper end surface 30a, while the lower surface of the
Has a second annular concave portion 24b into which the annular convex portion 34 can be fitted.
【0062】次に、本実施例に係る内燃機関用燃料噴射
弁の動作について説明する。燃料を噴射しない閉弁状態
すなわち休止状態においては、図7(a)に示すよう
に、弁体20の当接部20a外周面がシート面10bに
密接に当接して、内部空間Sと外部に通じる燃料噴射孔
10aとの連通を遮断している。この状態において、当
接部20aがシート面10bに当接する着座領域Mの下
流側及び上流側には、前行程で噴射された燃料の一部で
ある外側付着燃料F1及び内側溜り燃料F2が残留して
いる。Next, the operation of the fuel injection valve for an internal combustion engine according to this embodiment will be described. In the closed state where fuel is not injected, that is, in the rest state, as shown in FIG. 7A, the outer peripheral surface of the contact portion 20a of the valve body 20 comes into close contact with the seat surface 10b, and the internal space S and the outside are The communication with the fuel injection hole 10a is cut off. In this state, the downstream side and the upstream side of the seating area M of contact portion 20a comes into contact with the seat surface 10b is outside deposition is part of the fuel injected in the pre-stroke fuel F 1 and the inner reservoir fuel F 2 Remains.
【0063】ここで、燃料噴射開始信号が発せられる
と、励磁作用により、図7(b)に示すように、弁体2
0が開弁方向(U方向)に移動し始める。これに同期し
て、燃料通路形成部材30上端面の環状凹部33に環状
凸部24aが密接に嵌合して入口部31aを閉塞してい
た平板状部材24も、弁体20と共に移動し始め、入口
部31aを開放する。Here, when the fuel injection start signal is issued, the valve body 2 is excited by the exciting action as shown in FIG.
0 starts moving in the valve opening direction (U direction). In synchronization with this, the plate-like member 24, whose annular protrusion 24 a has been tightly fitted into the annular recess 33 on the upper end surface of the fuel passage forming member 30 and closed the inlet 31 a, also starts moving together with the valve element 20. Then, the entrance 31a is opened.
【0064】そして、弁体20の移動に伴なって、平板
状部材24が所定以上の距離を移動するまでは、環状接
触部である環状凸部24aの外周面と環状凹部33の外
側内壁面との密接な接触が保持され、燃料が満たされた
本体ケース10の内部空間Sと燃料通路31との連通が
遮断された状態のまま、平板状部材24下面の第2の環
状凹部24b,燃料通路形成部材30上端面の第2の環
状凸部34等により囲まれた密閉空間Vが入口部31a
に連通した状態で増大し続ける。Until the flat plate member 24 moves a predetermined distance or more along with the movement of the valve body 20, the outer peripheral surface of the annular convex portion 24 a which is the annular contact portion and the outer inner wall surface of the annular concave portion 33. And the second annular recess 24b on the lower surface of the plate-like member 24 while the communication between the fuel passage 31 and the internal space S of the main body case 10 filled with fuel is cut off. The closed space V surrounded by the second annular projection 34 and the like on the upper end surface of the passage forming member 30 forms the entrance portion 31a.
Continue to increase in communication with.
【0065】この際、弁体20すなわち平板状部材24
の移動は瞬時に行なわれるため、上記密閉空間Vの増大
が続く限り、燃料通路31内空間が吸引作用により一時
的に減圧された状態となる。と同時に、当接部20aも
シート面10bから離脱して、隙間が形成されているこ
とから、着座領域Mの下流側及び上流側に残留していた
外側付着燃料F1及び内側溜り燃料F2は、一時的に燃
料通路31内に向けてより一層強力に吸い戻される。At this time, the valve body 20, that is, the plate-like member 24
Is carried out instantaneously, so that the space in the fuel passage 31 is temporarily reduced in pressure by the suction action as long as the above-mentioned sealed space V continues to increase. At the same time, the contact portion 20a is also disengaged from the seat surface 10b, since the gap is formed, the outer remaining on the downstream side and the upstream side of the seating region M adhering fuel F 1 and the inner reservoir fuel F 2 Is temporarily more strongly sucked back into the fuel passage 31.
【0066】その後、環状凸部24aが環状凹部33か
ら離脱して、上記吸引作用あるいは減圧作用が消滅し、
弁体20が停止すると同時に、内部空間Sに満たされた
高圧の燃料が、燃料通路31を通り、吸い戻された燃料
F1,F2を巻き込んだ状態で出口部31bからスワー
ル流として噴出し、燃料噴射孔10aから一気に噴射さ
れる。Thereafter, the annular convex portion 24a separates from the annular concave portion 33, and the above-mentioned suction action or depressurization action disappears.
At the same time as the valve body 20 stops, the high-pressure fuel filled in the internal space S passes through the fuel passage 31 and is ejected as a swirl flow from the outlet portion 31b in a state in which the sucked back fuel F 1 and F 2 are involved. The fuel is injected at once from the fuel injection holes 10a.
【0067】従って、噴射初期において、燃料粒子の大
きい塊が噴射されることなく、噴射燃料の微粒化、実質
的な燃料噴射量のばらつきの抑制等が行なわれることに
なり、特に、燃料を直接筒内に噴射する内燃機関の場合
は、すす等の発生量が低減し、燃焼が安定し、排気性能
等が改善される。Therefore, in the early stage of the injection, atomization of the injected fuel, suppression of substantial variation in the fuel injection amount, etc. are performed without injecting large lumps of fuel particles. In the case of an internal combustion engine that injects fuel into a cylinder, the amount of soot and the like is reduced, combustion is stabilized, and exhaust performance and the like are improved.
【0068】図8は、本発明に係る内燃機関用燃料噴射
弁の第4の実施例を示す概略構成図である。本実施例で
は、平板状部材21と燃料通路形成部材30との間に、
環状弾性シール部材を設けた以外は、前述第1の実施例
と同様である。FIG. 8 is a schematic diagram showing a fourth embodiment of the fuel injection valve for an internal combustion engine according to the present invention. In the present embodiment, between the flat plate member 21 and the fuel passage forming member 30,
It is the same as the first embodiment except that an annular elastic seal member is provided.
【0069】すなわち、本実施例において、燃料通路形
成部材30の上端面30aには、弁体20の径方向にお
いて燃料通路31の入口部31aよりも外側の領域に環
状溝35が設けられており、この環状溝35に対して、
環状弾性シール部材としてのゴムリング40が配置され
ている。That is, in the present embodiment, the annular groove 35 is provided on the upper end surface 30a of the fuel passage forming member 30 in a region outside the inlet 31a of the fuel passage 31 in the radial direction of the valve body 20. , For this annular groove 35,
A rubber ring 40 is disposed as an annular elastic seal member.
【0070】上記ゴムリング40は、平板状部材21に
より圧縮力を受けない状態において、環状溝35にその
一部が埋没し、その他の部分は燃料通路形成部材30の
上端面30aから所定の高さ突出するように形成されて
いる。The rubber ring 40 is partially buried in the annular groove 35 in a state where the rubber ring 40 is not subjected to the compressive force by the flat plate member 21, and the other portion has a predetermined height from the upper end surface 30 a of the fuel passage forming member 30. It is formed so as to protrude.
【0071】そして、閉弁時においては、平板状部材2
1の端面21aが、ゴムリング40を圧縮変形させると
共に、燃料通路形成部材30の端面30aに当接し、燃
料通路31の入口部31aを閉塞した状態となってい
る。When the valve is closed, the flat plate member 2
The first end surface 21a compresses and deforms the rubber ring 40 and abuts against the end surface 30a of the fuel passage forming member 30 to close the inlet portion 31a of the fuel passage 31.
【0072】次に、本実施例に係る内燃機関用燃料噴射
弁の動作について説明する。燃料を噴射しない閉弁状態
すなわち休止状態においては、図9(a)に示すよう
に、弁体20の当接部20a外周面がシート面10bに
密接に当接して、内部空間Sと外部に通じる燃料噴射孔
10aとの連通を遮断している。この状態において、当
接部20aがシート面10bに当接する着座領域Mの下
流側及び上流側には、前行程で噴射された燃料の一部で
ある外側付着燃料F1及び内側溜り燃料F2が残留して
いる。Next, the operation of the fuel injection valve for an internal combustion engine according to this embodiment will be described. In the closed state in which fuel is not injected, that is, in the rest state, as shown in FIG. 9A, the outer peripheral surface of the contact portion 20a of the valve body 20 closely contacts the seat surface 10b, and The communication with the fuel injection hole 10a is cut off. In this state, the downstream side and the upstream side of the seating area M of contact portion 20a comes into contact with the seat surface 10b is outside deposition is part of the fuel injected in the pre-stroke fuel F 1 and the inner reservoir fuel F 2 Remains.
【0073】ここで、燃料噴射開始信号が発せられる
と、励磁作用により、図9(b)に示すように、弁体2
0が開弁方向(U方向)に移動し始める。これに同期し
て、燃料通路形成部材30の端面30aに密接して入口
部31aを閉塞していた平板状部材21も、弁体20と
共に移動し始め、入口部31aを開放する。Here, when the fuel injection start signal is issued, the valve body 2 is excited by the exciting action as shown in FIG.
0 starts moving in the valve opening direction (U direction). In synchronization with this, the flat plate-shaped member 21 which has been in close contact with the end face 30a of the fuel passage forming member 30 and has closed the inlet portion 31a also starts to move together with the valve body 20 and opens the inlet portion 31a.
【0074】そして、弁体の移動に伴なって、平板状部
材21が所定以上の距離を移動する間中、すなわち、平
板状部材21の下面と燃料通路形成部材30上端面との
間において圧縮された状態にあったゴムリング40が完
全に弾性復帰するまでの間中、燃料が満たされた本体ケ
ース10の内部空間Sと燃料通路31との連通が遮断さ
れた状態のまま、平板状部材21,燃料通路形成部材3
0,ゴムリング40等により囲まれた密閉空間Vが、入
口部31aに連通した状態で増大し続ける。During the movement of the plate member 21 over a predetermined distance with the movement of the valve body, the compression is performed between the lower surface of the plate member 21 and the upper end surface of the fuel passage forming member 30. Until the rubber ring 40 which has been in the closed state is completely elastically restored, the flat plate-like member is kept in a state where the communication between the internal space S of the main body case 10 filled with fuel and the fuel passage 31 is cut off. 21, fuel passage forming member 3
0, the sealed space V surrounded by the rubber ring 40 and the like continues to increase while communicating with the inlet 31a.
【0075】この際、弁体20すなわち平板状部材21
の移動に追従してゴムリング40が弾性復帰し、上記密
閉空間Vの増大が続く限り、燃料通路31内空間が吸引
作用により一時的に減圧された状態となる。と同時に、
当接部20aもシート面10bから離脱して、隙間が形
成されていることから、着座領域Mの下流側及び上流側
に残留していた外側付着燃料F1及び内側溜り燃料F2
は、一時的に燃料通路31内に向けて吸い戻される。At this time, the valve body 20, that is, the flat member 21
As the rubber ring 40 elastically returns following the movement of the closed space V, the space in the fuel passage 31 is temporarily reduced in pressure by the suction action as long as the above-mentioned sealed space V continues to increase. At the same time
Abutment 20a be separated from the seat surface 10b, since the gap is formed, the outer remaining on the downstream side and the upstream side of the seating region M adhering fuel F 1 and the inner reservoir fuel F 2
Is temporarily sucked back into the fuel passage 31.
【0076】その後、平板状部材21がゴムリング40
から離脱して、上記吸引作用あるいは減圧作用が消滅
し、弁体20が停止すると同時に、内部空間Sに満たさ
れた高圧の燃料が、燃料通路31を通り、吸い戻された
燃料F1,F2を巻き込んだ状態で出口部31bからス
ワール流として噴出し、燃料噴射孔10aから一気に噴
射される。Thereafter, the flat plate-like member 21 is
And the high-pressure fuel filled in the internal space S passes through the fuel passage 31 and the fuel F 1 , F sucked back at the same time as the valve body 20 stops. 2 is swirled out of the outlet 31b as a swirl flow, and is injected at once from the fuel injection holes 10a.
【0077】従って、噴射初期において、燃料粒子の大
きい塊が噴射されることなく、噴射燃料の微粒化、実質
的な燃料噴射量のばらつきの抑制等が行なわれることに
なり、特に、燃料を直接筒内に噴射する内燃機関の場合
は、すす等の発生量が低減し、燃焼が安定し、排気性能
等が改善される。Therefore, in the initial stage of injection, atomization of the injected fuel and suppression of substantial variation in the fuel injection amount are performed without injecting large lumps of fuel particles. In the case of an internal combustion engine that injects fuel into a cylinder, the amount of soot and the like is reduced, combustion is stabilized, and exhaust performance and the like are improved.
【0078】図10は、本発明に係る内燃機関用燃料噴
射弁の第5の実施例を示す概略構成図である。本実施例
では、通路遮断減圧手段として、弾性的に変形するパラ
ボラ状弾性シール部材を設けた以外は、前述第1の実施
例と同様である。FIG. 10 is a schematic diagram showing a fifth embodiment of the fuel injection valve for an internal combustion engine according to the present invention. This embodiment is the same as the first embodiment except that a parabolic elastic seal member that is elastically deformed is provided as the passage blocking pressure reducing means.
【0079】すなわち、本実施例において、弁体20に
は、図10に示すように、円形リブ25が形成されてお
り、この円形リブ25の端面において、略中央部50a
が密接に固定され、凹面が燃料通路形成部材30に対向
するように形成されたパラボラ状弾性シール部材50が
設けられている。That is, in the present embodiment, as shown in FIG. 10, a circular rib 25 is formed on the valve body 20, and an approximately central portion 50 a
Are closely fixed, and a parabola-shaped elastic seal member 50 is formed, the concave surface of which is opposed to the fuel passage forming member 30.
【0080】また、上記パラボラ状弾性シール部材50
は、その外周縁部50bが、燃料通路形成部材30の上
端面30aに開口する燃料通路31の入口部31aより
も径方向外側の領域において、燃料通路形成部材30の
上端面30aに密接に接触して、入口部31aを覆うこ
とができるように形成されている。The parabolic elastic sealing member 50
The outer peripheral edge portion 50b is in close contact with the upper end surface 30a of the fuel passage forming member 30 in a region radially outside the inlet portion 31a of the fuel passage 31 which is opened at the upper end surface 30a of the fuel passage forming member 30. Thus, it is formed so as to cover the inlet 31a.
【0081】そして、上記パラボラ状弾性シール部材5
0は、閉弁状態において、略中央部50aが燃料通路形
成部材30に近づく方向に変形した状態で保持され、
又、弁体20が開弁動作により所定の距離を移動する間
中、外周縁部50bが燃料通路形成部材30の上端面3
0aに密接に接触し続けるようになっている。The parabolic elastic sealing member 5
0 is held in a state where the substantially central portion 50a is deformed in a direction approaching the fuel passage forming member 30 in the valve closed state,
Further, while the valve body 20 moves a predetermined distance by the valve opening operation, the outer peripheral edge portion 50b is connected to the upper end surface 3 of the fuel passage forming member 30.
0a is kept in close contact.
【0082】次に、本実施例に係る内燃機関用燃料噴射
弁の動作について説明する。Next, the operation of the fuel injection valve for an internal combustion engine according to this embodiment will be described.
【0083】燃料を噴射しない閉弁状態すなわち休止状
態においては、図11(a)に示すように、弁体20の
当接部20a外周面がシート面10bに密接に当接し
て、内部空間Sと外部に通じる燃料噴射孔10aとの連
通を遮断している。この状態において、当接部20aが
シート面10bに当接する着座領域Mの下流側及び上流
側には、前行程で噴射された燃料の一部である外側付着
燃料F1及び内側溜り燃料F2が残留している。In the closed state where fuel is not injected, that is, in the rest state, as shown in FIG. 11A, the outer peripheral surface of the contact portion 20a of the valve body 20 comes into close contact with the seat surface 10b, and the internal space S And the fuel injection hole 10a communicating with the outside is blocked. In this state, the downstream side and the upstream side of the seating area M of contact portion 20a comes into contact with the seat surface 10b is outside deposition is part of the fuel injected in the pre-stroke fuel F 1 and the inner reservoir fuel F 2 Remains.
【0084】ここで、燃料噴射開始信号が発せられる
と、励磁作用により、図11(b)に示すように、弁体
20が開弁方向(U方向)に移動し始める。これに同期
して、パラボラ状弾性シール部材50の略中央部50a
も、弁体20とともに移動し始める。Here, when the fuel injection start signal is issued, the valve element 20 starts to move in the valve opening direction (U direction) as shown in FIG. In synchronization with this, the substantially central portion 50a of the parabolic elastic seal member 50
Starts moving together with the valve element 20.
【0085】また、パラボラ状弾性シール部材50は閉
弁状態においてその中央部50aが予め弾性変形した状
態となっているため、この弾性変形が完全に復帰するま
で、外周縁部50bが燃料通路形成部材30の上端面3
0aに密接に接触しつつ、中央部50aから外側に向け
て弾性復帰を行ない続ける。この弾性復帰の間中、燃料
が満たされた本体ケース10の内部空間Sと燃料通路3
1との連通が遮断された状態のまま、パラボラ状弾性シ
ール部材50,燃料通路形成部材30等により囲まれた
密閉空間Vが入口部31aに連通した状態で増大し続け
る。Since the central portion 50a of the parabolic elastic seal member 50 is elastically deformed in advance in the valve-closed state, the outer peripheral edge 50b is formed in the fuel passage until the elastic deformation is completely restored. Upper end surface 3 of member 30
While being in close contact with Oa, the elastic return continues from the central portion 50a outward. During this elastic return, the inner space S of the main body case 10 filled with fuel and the fuel passage 3
The airtight space V surrounded by the parabolic elastic seal member 50, the fuel passage forming member 30, and the like continues to increase in a state where the communication with the inlet portion 31a is communicated, while the communication with the first member 1 is interrupted.
【0086】この際、弁体20の移動に伴って、パラボ
ラ状弾性シール部材50が弾性復帰し、上記密閉空間V
の増大が続く限り、燃料通路31内空間が吸引作用によ
り一時的に減圧された状態となる。と同時に、当接部2
0aもシート面10bから離脱して隙間が形成されてい
ることから、着座領域Mの下流側及び上流側に残留して
いた外側付着燃料F1及び内側溜り燃料F2は、一時的
に燃料通路31内に向けて吸い戻される。At this time, with the movement of the valve body 20, the parabolic elastic seal member 50 elastically returns to the closed space V.
As long as the increase continues, the space in the fuel passage 31 is temporarily reduced in pressure by the suction action. At the same time, contact part 2
0a from the fact that the gap disengaged from the seat surface 10b is formed, the outer adhering fuel F 1 and the inner reservoir fuel F 2 remaining in the downstream and upstream side of the seating region M temporarily the fuel passage It is sucked back into 31.
【0087】その後、パラボラ状弾性シール部材50が
完全に弾性復帰して、その外周縁部50bが燃料通路形
成部材30の上端面30aから離脱して、上記吸引作用
あるいは減圧作用が消滅し、弁体20が停止すると同時
に、内部空間Sに満たされた高圧の燃料が、燃料通路3
1を通り、吸い戻された燃料F1,F2を巻き込んだ状
態で出口部31bからスワール流として噴出し、燃料噴
射孔10aから一気に噴射される。Thereafter, the parabolic elastic seal member 50 is completely elastically restored, and its outer peripheral edge 50b is separated from the upper end surface 30a of the fuel passage forming member 30, so that the above-mentioned suction or depressurizing action is extinguished. At the same time when the body 20 stops, the high-pressure fuel filled in the internal space S is supplied to the fuel passage 3.
1, the fuel F 1 , F 2 , which has been sucked back, is ejected as a swirl flow from the outlet portion 31 b in a state where the fuel F 1 , F 2 is entrained, and is injected at once from the fuel injection hole 10 a.
【0088】従って、噴射初期において、燃料粒子の大
きい塊が噴射されることなく、噴射燃料の微粒化、実質
的な燃料噴射量のばらつきの抑制等が行なわれることに
なり、特に、燃料を直接筒内に噴射する内燃機関の場合
は、すす等の発生量が低減し、燃焼が安定し、排気性能
等が改善される。Therefore, in the early stage of the injection, atomization of the injected fuel and suppression of a substantial variation in the fuel injection amount are performed without injecting large lumps of fuel particles. In the case of an internal combustion engine that injects fuel into a cylinder, the amount of soot and the like is reduced, combustion is stabilized, and exhaust performance and the like are improved.
【0089】以上述べた各々の実施例において、弁体2
0の当接部20aがシート面10bに当接する着座領域
での燃料の圧力を時間の経過すなわち弁体20の移動量
(リフト量)との関係で表すと、図12に示すようにな
る。In each of the embodiments described above, the valve 2
FIG. 12 shows the fuel pressure in the seating region where the zero contact portion 20a contacts the seat surface 10b in relation to the passage of time, that is, the movement amount (lift amount) of the valve body 20.
【0090】図12に示すように、着座領域近傍の燃料
圧力は、弁体20が移動(リフト)する初期の段階にお
いて一時的に減少し、その後、弁体20の移動と共に急
速に本体ケース10内の燃料圧力に達する。As shown in FIG. 12, the fuel pressure in the vicinity of the seating region temporarily decreases in the initial stage when the valve body 20 moves (lifts), and then rapidly as the valve body 20 moves. Reach the fuel pressure within.
【0091】また、上記本発明に係る各々の実施例での
内燃機関用燃料噴射弁と従来の内燃機関用燃料噴射弁と
の噴霧形態を表すと、図13に示すようになる。FIG. 13 shows the spray form of the fuel injection valve for an internal combustion engine and the conventional fuel injection valve for an internal combustion engine in each embodiment according to the present invention.
【0092】すなわち、従来のものでは、図13(a)
に示すように、噴霧の略中央部に燃料密度の濃い部分が
長く伸びた状態で噴射されるが、本発明に係るもので
は、図13(b)に示すように、全体的に燃料密度が略
均一なホロコーン状として噴射されることになり、燃料
噴霧の微粒化等が促進されることになる。That is, in the conventional device, FIG.
As shown in FIG. 13, a portion with a high fuel density is injected into a substantially central portion of the spray in a state in which the fuel density is long, but according to the present invention, as shown in FIG. The fuel is injected in a substantially uniform hollow cone shape, and the atomization of the fuel spray is promoted.
【0093】以上述べた内燃機関用燃料噴射弁は、燃料
を直接筒内に噴射する筒内噴射型の内燃機関のみに適用
されるものではなく、吸気管内に燃料を噴射するタイプ
の内燃機関についても適用可能である。The fuel injection valve for an internal combustion engine described above is not only applied to an in-cylinder injection type internal combustion engine that directly injects fuel into a cylinder, but is applicable to an internal combustion engine that injects fuel into an intake pipe. Is also applicable.
【図1】 本発明に係る内燃機関用燃料噴射弁の第1の
実施例を示す概略構成図である。FIG. 1 is a schematic configuration diagram showing a first embodiment of a fuel injection valve for an internal combustion engine according to the present invention.
【図2】 図1中のE−E部における断面図である。FIG. 2 is a sectional view taken along the line EE in FIG.
【図3】 図1に示す内燃機関用燃料噴射弁の動作を説
明する図であり、(a)は閉弁状態、(b)は開弁動作
中の状態を示すものである。3A and 3B are diagrams for explaining the operation of the fuel injection valve for an internal combustion engine shown in FIG. 1, wherein FIG. 3A shows a valve closed state, and FIG. 3B shows a state during a valve opening operation.
【図4】 本発明に係る内燃機関用燃料噴射弁の第2の
実施例を示す概略構成図である。FIG. 4 is a schematic configuration diagram showing a second embodiment of a fuel injection valve for an internal combustion engine according to the present invention.
【図5】 図4に示す内燃機関用燃料噴射弁の動作を説
明する図であり、(a)は閉弁状態,(b)は開弁動作
中の状態を示すものである。5A and 5B are diagrams for explaining the operation of the fuel injection valve for an internal combustion engine shown in FIG. 4, in which FIG. 5A shows a valve closed state, and FIG. 5B shows a state during a valve opening operation.
【図6】 本発明に係る内燃機関用燃料噴射弁の第3の
実施例を示す概略構成図である。FIG. 6 is a schematic configuration diagram showing a third embodiment of a fuel injection valve for an internal combustion engine according to the present invention.
【図7】 図6に示す内燃機関用燃料噴射弁の動作を説
明する図であり、(a)は閉弁状態,(b)は開弁動作
中の状態を示すものである。7A and 7B are diagrams for explaining the operation of the fuel injection valve for an internal combustion engine shown in FIG. 6, wherein FIG. 7A shows a valve closed state, and FIG. 7B shows a state during a valve opening operation.
【図8】 本発明に係る内燃機関用燃料噴射弁の第4の
実施例を示す概略構成図である。FIG. 8 is a schematic configuration diagram showing a fourth embodiment of the fuel injection valve for an internal combustion engine according to the present invention.
【図9】 図8に示す内燃機関用燃料噴射弁の動作を説
明する図であり、(a)は閉弁状態,(b)は開弁動作
中の状態を示すものである。9A and 9B are diagrams for explaining the operation of the fuel injection valve for an internal combustion engine shown in FIG. 8, wherein FIG. 9A shows a valve closed state, and FIG. 9B shows a state during a valve opening operation.
【図10】 本発明に係る内燃機関用燃料噴射弁の第5
の実施例を示す概略構成図である。FIG. 10 shows a fifth embodiment of the fuel injection valve for an internal combustion engine according to the present invention.
It is a schematic structure figure showing an example of.
【図11】 図10に示す内燃機関用燃料噴射弁の動作
を説明する図であり、(a)は閉弁状態,(b)は開弁
動作中の状態を示すものである。11A and 11B are diagrams illustrating the operation of the fuel injection valve for an internal combustion engine shown in FIG. 10, in which FIG. 11A shows a valve closed state, and FIG. 11B shows a state during a valve opening operation.
【図12】 本発明に係る内燃機関用燃料噴射弁での着
座領域近傍における燃料圧力の変化を示すグラフであ
る。FIG. 12 is a graph showing a change in fuel pressure in the vicinity of a seating area in the fuel injection valve for an internal combustion engine according to the present invention.
【図13】 内燃機関用燃料噴射弁から噴射される噴霧
形態を示す図であり、(a)は従来の噴霧形態、(b)
は本発明に係る噴霧形態を示すものである。13A and 13B are diagrams showing a spray form injected from a fuel injection valve for an internal combustion engine, wherein FIG. 13A is a conventional spray form, and FIG.
Shows a spray form according to the present invention.
【図14】 従来の内燃機関用燃料噴射弁を示す概略構
成図である。FIG. 14 is a schematic configuration diagram showing a conventional fuel injection valve for an internal combustion engine.
【図15】 従来の内燃機関用燃料噴射弁を示す概略構
成図である。FIG. 15 is a schematic configuration diagram showing a conventional fuel injection valve for an internal combustion engine.
【図16】 従来の内燃機関用燃料噴射弁を示す概略構
成図である。FIG. 16 is a schematic configuration diagram showing a conventional fuel injection valve for an internal combustion engine.
10 本体ケース 10a 燃料噴射孔 10b シート面 11 ストッパ 20 弁体 20a 当接部 21 平板状部材(通路遮断減圧手段) 21a 端面(下面) 22 傘部 23 平板状部材(通路遮断減圧手段) 23a 柱状凸部(環状接触部) 24 平板状部材(通路遮断減圧手段) 24a 環状凸部(環状接触部) 24b 第2の環状凹部 25 円形リブ 30 燃料通路形成部材 30a 上端面 30b 案内孔 31 燃料通路 31a 入口部 31b 出口部 32 柱状凹部(環状接触部) 34 第2の環状凸部 35 環状溝 40 ゴムリング(環状弾性シール部材) 50 パラボラ状弾性シール部材(通路遮断減圧手段) 50a 中央部 50b 外周縁部 DESCRIPTION OF SYMBOLS 10 Main body case 10a Fuel injection hole 10b Seat surface 11 Stopper 20 Valve element 20a Contact portion 21 Flat member (passage depressurizing means) 21a End face (lower surface) 22 Head 23 Flat plate member (passage depressurizing means) 23a Column-shaped convex Portion (annular contact portion) 24 Flat member (passage blocking pressure reducing means) 24a Annular convex portion (annular contact portion) 24b Second annular concave portion 25 Circular rib 30 Fuel passage forming member 30a Upper end surface 30b Guide hole 31 Fuel passage 31a Inlet Portion 31b Outlet portion 32 Columnar concave portion (annular contact portion) 34 Second annular convex portion 35 Annular groove 40 Rubber ring (annular elastic seal member) 50 Parabolic elastic seal member (passage depressurizing means) 50a Central portion 50b Outer peripheral edge portion
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 FI F02M 61/12 F02M 61/12 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification code FI F02M 61/12 F02M 61/12
Claims (5)
形成すると共に一端部において燃料噴射孔及び前記燃料
噴射孔に続く内側領域にシート面を有する本体ケース
と、前記本体ケース内に往復動自在に配置されかつ一端
部において前記シート面に当接して前記本体ケースの内
部空間と前記燃料噴射孔との連通を遮断し得る当接部を
有する弁体と、前記本体ケース内の所定位置に入口部を
有しかつ前記当接部が前記シート面に当接する領域より
も上流の位置に出口部を有する燃料通路を形成する燃料
通路形成部材とを備え、前記当接部が前記シート面に当
接した閉弁状態において前記燃料噴射孔からの燃料の噴
射を停止し、前記当接部が前記シート面から離脱した開
弁状態において前記燃料噴射孔から燃料を噴射する内燃
機関用燃料噴射弁であって、 前記閉弁状態において前記本体ケースの内部空間と前記
燃料通路との連通を遮断し、かつ、前記弁体の開弁動作
に伴なって少なくとも前記燃料通路内の圧力を一時的に
減圧させる通路遮断減圧手段を有する、ことを特徴とす
る内燃機関用燃料噴射弁。1. A main body case having a substantially cylindrical shape to form an internal space for guiding fuel and having a fuel injection hole at one end and a seat surface in an inner area following the fuel injection hole, and reciprocating in the main body case. A valve body movably disposed and having an abutting portion at one end which can abut on the seat surface to interrupt communication between the internal space of the main body case and the fuel injection hole; and a predetermined position in the main body case. A fuel passage forming member that forms a fuel passage having an outlet at a position upstream of a region where the abutting portion abuts the seat surface, wherein the abutting portion abuts the seat surface. Fuel injection for an internal combustion engine that stops injection of fuel from the fuel injection hole in a valve closed state in which the fuel injection hole is in contact with the fuel injection hole and injects fuel from the fuel injection hole in an open state in which the abutment portion is separated from the seat surface. With a valve In the closed state, the communication between the internal space of the main body case and the fuel passage is interrupted, and at least the pressure in the fuel passage is temporarily reduced with the opening operation of the valve body. A fuel injection valve for an internal combustion engine, comprising: a passage cut-off pressure reducing means for causing the fuel to flow.
して一体的に固定されかつ前記弁体の往復動方向におい
て前記燃料通路形成部材の上端面に対し当接及び離脱し
て前記燃料通路の入口部を開閉する平板状部材である、
ことを特徴とする請求項1記載の内燃機関用燃料噴射
弁。2. The fuel supply system according to claim 2, wherein the passage blocking pressure reducing means is integrally fixed to the valve body and abuts on and separates from an upper end surface of the fuel passage forming member in a reciprocating direction of the valve body. A flat member that opens and closes the entrance of the passage,
The fuel injection valve for an internal combustion engine according to claim 1, wherein:
周面に密接して前記弁体を往復動自在に案内する案内孔
と、前記案内孔よりも径方向外側の領域でかつ前記弁体
の往復動方向上流側に向けて開口するように形成された
前記入口部とを有し、 前記通路遮断減圧手段は、前記弁体に対して一体的に固
定されかつ前記弁体の径方向において前記入口部よりも
外側の領域まで広がると共に前記弁体の往復動方向にお
いて前記燃料通路の入口部を開閉する略円形の平板状部
材を有し、 前記平板状部材と前記燃料通路形成部材とは、前記入口
部よりも径方向外側の全周領域において、前記弁体の開
弁動作による所定移動距離の間中、径方向においてお互
いに密接に接触し続けるような環状接触部を有する、こ
とを特徴とする請求項1記載の内燃機関用燃料噴射弁。3. The fuel passage forming member includes a guide hole that closely contacts an outer peripheral surface of the valve body and guides the valve body in a reciprocating manner, and a region radially outside the guide hole and the valve. The inlet portion formed so as to open toward the upstream side in the reciprocating direction of the body, wherein the passage blocking and depressurizing means is integrally fixed to the valve body and in the radial direction of the valve body. And a substantially circular plate-shaped member that opens and closes an inlet of the fuel passage in a reciprocating direction of the valve body while extending to a region outside the inlet. Has an annular contact portion that keeps in close contact with each other in the radial direction during a predetermined movement distance due to the valve opening operation of the valve body in the entire peripheral region radially outside the inlet portion. The internal combustion engine according to claim 1, wherein Fuel injection valve.
周面に密接して前記弁体を往復動自在に案内する案内孔
と、前記案内孔よりも径方向外側の領域でかつ前記弁体
の往復動方向上流側に向けて開口するように形成された
前記入口部とを有し、 前記通路遮断減圧手段は、前記弁体に対して一体的に固
定されかつ前記弁体の径方向において前記入口部よりも
外側の領域まで広がると共に前記弁体の往復動方向にお
いて前記燃料通路の入口部を開閉する略円形の平板状部
材を有し、 前記平板状部材と前記燃料通路形成部材との間には、前
記弁体の径方向において前記入口部よりも外側の領域に
位置付けられた環状弾性シール部材を有し、 前記環状弾性シール部材は、前記弁体の開弁動作による
所定移動距離の間中、前記弁体の往復動方向において前
記平板状部材下面及び燃料通路形成部材上面に密接に接
触し続けるように配置されている、ことを特徴とする請
求項1記載の内燃機関用燃料噴射弁。4. The valve according to claim 1, wherein the fuel passage forming member includes a guide hole which closely contacts an outer peripheral surface of the valve body and guides the valve body in a reciprocating manner, and a region radially outside the guide hole and the valve. The inlet portion formed so as to open toward the upstream side in the reciprocating direction of the body, wherein the passage blocking and depressurizing means is integrally fixed to the valve body and in the radial direction of the valve body. And a substantially circular plate-shaped member that opens and closes an inlet of the fuel passage in a reciprocating direction of the valve body while extending to a region outside the inlet. And an annular elastic seal member positioned in a region outside the inlet portion in the radial direction of the valve body, wherein the annular elastic seal member moves a predetermined distance by a valve opening operation of the valve body. During the reciprocating direction of the valve 2. The fuel injection valve for an internal combustion engine according to claim 1, wherein the fuel injection valve is arranged so as to keep in close contact with the lower surface of the flat member and the upper surface of the fuel passage forming member.
周面に密接して前記弁体を往復動自在に案内する案内孔
と、前記案内孔よりも径方向外側の領域でかつ前記弁体
の往復動方向上流側に向けて開口するように形成された
前記入口部とを有し、 前記通路遮断減圧手段は、略中央部が前記弁体の外周部
に密接に固定されると共に凹面が前記燃料通路形成部材
に対向するようにかつ外周縁部が前記入口部よりも径方
向外側の領域において前記燃料通路形成部材の端面に密
接に接触し得るように形成されたパラボラ状弾性シール
部材を有し、 前記パラボラ状弾性シール部材は、閉弁状態において略
中央部が前記燃料通路形成部材に近づく方向に変形した
状態で保持され、かつ、前記弁体の開弁動作による所定
移動距離の間中、前記外周縁部が前記燃料通路形成部材
の上端面に密接に接続し続けるように配置されている、
ことを特徴とする請求項1記載の内燃機関用燃料噴射
弁。5. The fuel passage forming member includes a guide hole that closely contacts an outer peripheral surface of the valve body and guides the valve body in a reciprocating manner, and a region radially outside the guide hole and the valve. The inlet portion formed so as to open toward the upstream side in the reciprocating direction of the body, wherein the passage blocking and depressurizing means has a substantially central portion closely fixed to an outer peripheral portion of the valve body and a concave surface. A parabolic elastic seal member formed so as to face the fuel passage forming member and to be able to come into intimate contact with the end face of the fuel passage forming member in a region whose outer peripheral edge is radially outside the inlet portion. The parabolic elastic seal member is held in a state where a substantially central portion is deformed in a direction approaching the fuel passage forming member in a valve closed state, and has a predetermined moving distance due to a valve opening operation of the valve body. All the way, the outer peripheral edge is Is arranged to remain closely connected to the upper end surface of the charge path forming member,
The fuel injection valve for an internal combustion engine according to claim 1, wherein:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP341198A JPH11200999A (en) | 1998-01-09 | 1998-01-09 | Fuel injection valve for internal combustion engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP341198A JPH11200999A (en) | 1998-01-09 | 1998-01-09 | Fuel injection valve for internal combustion engine |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH11200999A true JPH11200999A (en) | 1999-07-27 |
Family
ID=11556648
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP341198A Pending JPH11200999A (en) | 1998-01-09 | 1998-01-09 | Fuel injection valve for internal combustion engine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH11200999A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004308603A (en) * | 2003-04-09 | 2004-11-04 | Denso Corp | Fluid injection valve |
WO2009016004A1 (en) * | 2007-07-31 | 2009-02-05 | Robert Bosch Gmbh | Fuel injector having a centering sleeve resting on the ball valve seat of a jet needle as a guide for the jet needle |
EP1379776B1 (en) * | 2001-04-10 | 2009-10-21 | Robert Bosch Gmbh | Injector nozzle with throttling action |
-
1998
- 1998-01-09 JP JP341198A patent/JPH11200999A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1379776B1 (en) * | 2001-04-10 | 2009-10-21 | Robert Bosch Gmbh | Injector nozzle with throttling action |
JP2004308603A (en) * | 2003-04-09 | 2004-11-04 | Denso Corp | Fluid injection valve |
WO2009016004A1 (en) * | 2007-07-31 | 2009-02-05 | Robert Bosch Gmbh | Fuel injector having a centering sleeve resting on the ball valve seat of a jet needle as a guide for the jet needle |
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