JP2002364486A - Fuel injection valve for cylinder injection - Google Patents
Fuel injection valve for cylinder injectionInfo
- Publication number
- JP2002364486A JP2002364486A JP2001172554A JP2001172554A JP2002364486A JP 2002364486 A JP2002364486 A JP 2002364486A JP 2001172554 A JP2001172554 A JP 2001172554A JP 2001172554 A JP2001172554 A JP 2001172554A JP 2002364486 A JP2002364486 A JP 2002364486A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- injection
- fuel
- valve body
- valve seat
- 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.)
- Granted
Links
Landscapes
- Fuel-Injection Apparatus (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、内燃機関の燃焼
室内に直接噴射するためにシリンダーヘッドに取り付け
られる筒内噴射用燃料噴射弁に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-cylinder fuel injection valve mounted on a cylinder head for direct injection into a combustion chamber of an internal combustion engine.
【０００２】[0002]
【従来の技術】図８は、例えば、特許第２６１０９６１
号公報に開示された従来の燃料噴射弁における先端部分
を拡大した拡大断面図である。図において、図示されな
い電磁コイルに電流が通電され、図示されない可動子と
一体構造である弁体９が紙面上方に可動する。弁体９は
中空円筒型の弁本体１０の一端に設けられた弁座部１０
ｂから離れて、弁体９と弁座部１０ｂとの間に間隙が形
成される。高圧の燃料は、弁本体１０内部から該間隙を
通って、プレートト１１に形成された噴射口１１ａによ
り調量されて、図示されないエンジンの燃焼室内に噴射
される。一方、電磁コイルへの電流の通電が停止する
と、弁体９が閉弁方向（紙面下方）に押し出され、該間
隙は閉じられて燃料噴射が終了する。2. Description of the Related Art FIG.
FIG. 2 is an enlarged cross-sectional view in which a distal end portion of a conventional fuel injection valve disclosed in Japanese Patent Application Publication No. H10-12064 is enlarged. In the figure, a current is supplied to an electromagnetic coil (not shown), and a valve body 9 integrated with a movable element (not shown) moves upward in the drawing. The valve body 9 is a valve seat 10 provided at one end of a hollow cylindrical valve body 10.
b, a gap is formed between the valve body 9 and the valve seat 10b. The high-pressure fuel is metered by an injection port 11a formed in the plate 11 from the inside of the valve body 10 through the gap, and is injected into a combustion chamber (not shown) of the engine. On the other hand, when the current supply to the electromagnetic coil is stopped, the valve body 9 is pushed out in the valve closing direction (downward in the drawing), the gap is closed, and the fuel injection ends.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来の
燃料噴射弁は、図９に示すように、プレート１１の上流
側の面にカーボンデポジットが付着しやすく、このカー
ボンデポジットにより燃料の流量が変化するという問題
点があった。すなわち、エンジンの燃焼室内に直接噴射
する筒内噴射用燃料噴射弁として使用する場合において
は、プレート１１がシリンダ筒内に露出しているため、
エンジンの燃焼熱を直接受け、噴射口１１ａ付近以外
の、プレート１１上流側の燃料流速の遅い箇所でカーボ
ンデポジットが堆積する。従来の燃料噴射弁は、プレー
ト１１上流側の面が弁本体１０の弁座部１０ｂの通路に
開口しており、この部分の面積Ｓが広く、カーボンデポ
ジットが堆積しやすい。また、二つの噴射口１１ａ間
は、弁本体１０と直接接触していないので、熱伝導によ
る放熱は期待できず高温化部分となり、カーボンデポジ
ットが堆積しやすい。However, in the conventional fuel injection valve, as shown in FIG. 9, carbon deposits tend to adhere to the surface on the upstream side of the plate 11, and the flow rate of the fuel is changed by the carbon deposits. There was a problem. That is, when used as an in-cylinder fuel injection valve that injects directly into the combustion chamber of the engine, since the plate 11 is exposed inside the cylinder cylinder,
Directly receiving the combustion heat of the engine, carbon deposits are deposited at a location where the fuel flow rate is low on the upstream side of the plate 11 except for the vicinity of the injection port 11a. In the conventional fuel injection valve, the surface on the upstream side of the plate 11 is open to the passage of the valve seat portion 10b of the valve body 10, and the area S of this portion is large, so that carbon deposit is easily deposited. Further, since the space between the two injection ports 11a is not in direct contact with the valve body 10, heat dissipation due to heat conduction cannot be expected, and the portion becomes a high temperature portion, and carbon deposits are easily deposited.
【０００４】上述した面積Ｓを小さくするために、図１
０に示すように、２つの噴射口１１ａ間を接近して配置
させることも考えられるが、２つの噴射口１１ａから噴
射された燃料同士の噴霧干渉が発生して、噴霧の微粒子
化が悪くなるという問題点があり、面積Ｓを小さくする
ことは困難である。In order to reduce the area S described above, FIG.
Although it is conceivable to dispose the two injection ports 11a close to each other as shown in FIG. 0, spray interference between the fuel injected from the two injection ports 11a occurs, and the atomization of the spray deteriorates. It is difficult to reduce the area S.
【０００５】また、筒内噴射用燃料噴射弁の機能とし
て、燃料をより微粒子化するため、噴射口１１ａの内径
を、例えばφ０．１５ｍｍまで小さくすることが望まし
い。プレート１１を量産性の高いプレス加工によって製
造する場合には、プレート１１の厚さを噴射口１１ａの
内径と同程度まで薄くする必要がある。プレート１１と
弁本体１０の弁座部１０ｂとは溶接で接合されている
が、筒内噴射用燃料燃料噴射弁に使用する燃料の燃圧
は、例えば１０ＭＰａ以上と高く設定されているので、
プレート１１が薄いと溶接部の破壊または変形を生じる
という問題点があった。Further, as a function of the in-cylinder injection fuel injection valve, it is desirable to reduce the inner diameter of the injection port 11a to, for example, φ0.15 mm in order to make the fuel finer. When the plate 11 is manufactured by press working with high mass productivity, it is necessary to reduce the thickness of the plate 11 to about the same as the inner diameter of the injection port 11a. The plate 11 and the valve seat portion 10b of the valve body 10 are joined by welding. However, since the fuel pressure of the fuel used for the in-cylinder fuel injection fuel injector is set to be as high as, for example, 10 MPa or more,
If the plate 11 is thin, there is a problem that the welded portion is broken or deformed.
【０００６】この発明は、以上のような問題点を解決す
るためになされたもので、噴射口上流でのカーボンデポ
ジットの堆積を防ぎ、このカーボンデポジットによる燃
料の流量変化が抑制された筒内噴射用燃料噴射弁を得る
ことを目的とする。また、噴射口が形成されるプレート
と弁本体との接続が強固な筒内噴射用燃料噴射弁を得る
ことを目的とする。また、加工の自由度が高く、コスト
が安い筒内噴射用燃料噴射弁を得ることを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. In-cylinder injection in which carbon deposits are prevented from being deposited upstream of an injection port, and a change in fuel flow due to the carbon deposits is suppressed. It is intended to obtain a fuel injection valve for use. It is another object of the present invention to obtain an in-cylinder fuel injection valve having a strong connection between a plate having an injection port and a valve body. It is another object of the present invention to obtain an in-cylinder fuel injection valve having a high degree of freedom in processing and a low cost.
【０００７】[0007]
【課題を解決するための手段】この発明に係る筒内燃料
噴射弁は、中空円筒型でその一端に複数の噴射口が形成
された部材を有する弁座部が設けられた弁本体、電磁コ
イルへの通電により弁座部から離接して複数の噴射口か
ら噴射される燃料を制御する弁体、弁座部の下流と複数
の噴射口を接続する複数の噴射口と同数またはそれ以下
の複数の燃料流路を備えたものである。SUMMARY OF THE INVENTION An in-cylinder fuel injection valve according to the present invention is provided with a valve body having a hollow cylindrical type having a valve seat having a plurality of injection ports formed at one end thereof, and an electromagnetic coil. A valve element that controls fuel injected from a plurality of injection ports by being separated from and coming into contact with the valve seat by energizing the valve, the same number or less than the plurality of injection ports that connect the downstream of the valve seat and the plurality of injection ports Of the fuel passage.
【０００８】また、弁座部と弁本体とは別の部材で構成
され、弁座部は金属射出成型または焼結で形成されるも
のである。Further, the valve seat and the valve body are formed of different members, and the valve seat is formed by metal injection molding or sintering.
【０００９】また、弁本体と複数の燃料流路とは別の部
材で構成され、燃料流路は、金属射出成型または焼結で
形成されるものである。Further, the valve body and the plurality of fuel passages are constituted by different members, and the fuel passages are formed by metal injection molding or sintering.
【００１０】また、複数の噴射口が形成された部材と弁
座部との接合箇所は、複数の噴射口の近傍である。The joint between the member having the plurality of injection ports and the valve seat is near the plurality of injection ports.
【００１１】[0011]
【発明の実施の形態】実施の形態１．図１は、この発明
の実施の形態１による筒内噴射用燃料噴射弁を示す縦断
面図、図２は、図１の燃料噴射弁における先端部分を拡
大した拡大断面図、図３は、図２の燃料噴射弁をＡ方向
から見た正面図である。図において、１は燃料噴射弁全
体を示しており、２はソレノイド装置、３はヨーク、４
は弁ホルダ、５はコア、６はコイル、７はアマチュア、
８は弁装置であり、弁体９、弁本体１０、プレート１１
及びストッパ１２で構成されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 1 is a longitudinal sectional view showing a fuel injection valve for in-cylinder injection according to a first embodiment of the present invention, FIG. 2 is an enlarged sectional view showing an enlarged front end portion of the fuel injection valve shown in FIG. 1, and FIG. FIG. 2 is a front view of a second fuel injection valve viewed from a direction A. In the figure, 1 indicates the entire fuel injection valve, 2 indicates a solenoid device, 3 indicates a yoke, 4
Is a valve holder, 5 is a core, 6 is a coil, 7 is an amateur,
Reference numeral 8 denotes a valve device, which includes a valve body 9, a valve body 10, and a plate 11.
And a stopper 12.
【００１２】弁本体１０は、弁本体１０内で中心孔先端
に固着されて複数の噴射口１１ａが形成されたプレート
１１を有する弁座部１０ｂを含み、弁体９は、ソレノイ
ド装置２により弁座部１０ｂに離接して複数の噴射口１
１ａを開閉させる。弁本体１０は、弁ホルダ４の内径部
に挿入後、溶接部４ａによって結合されている。アマチ
ュア７は、弁体９に溶接部７ａで結合されている。プレ
ート１１は弁本体１０の内径部に挿入され、溶接部１１
ｂで弁本体１０のエンジン燃焼室側端面１０ａに固定さ
れている。本実施の形態では、弁座部１０ｂの下流にて
形成された通路１０ｃと複数の噴射口１１ａとを直接接
続する燃料流路１０ｄを設けることにより、二つの噴射
口１１ａ間には弁本体１０と直接接触する金属部１０ｅ
が形成される。The valve body 10 includes a valve seat portion 10b having a plate 11 having a plurality of injection ports 11a fixed to a tip of a center hole in the valve body 10; The plurality of injection ports 1 are separated from and in contact with the seat 10b.
1a is opened and closed. After being inserted into the inner diameter portion of the valve holder 4, the valve body 10 is joined by a weld 4a. The amateur 7 is connected to the valve body 9 by a weld 7a. The plate 11 is inserted into the inner diameter portion of the valve body 10,
The valve body 10 is fixed to the engine combustion chamber side end face 10a at b. In the present embodiment, by providing a fuel passage 10d that directly connects the passage 10c formed downstream of the valve seat portion 10b and the plurality of injection ports 11a, the valve body 10 is provided between the two injection ports 11a. Metal part 10e in direct contact with
Is formed.
【００１３】次に動作について説明する。エンジンのマ
イコンより燃料噴射弁１の駆動回路に動作信号が送られ
ると、燃料噴射弁１のコイル６に電流が通電され、アマ
チュア７、コア５、ヨーク３及び弁ホルダ４で構成され
る磁気回路に磁束が発生し、アマチュア７はコア５側へ
吸引される。アマチュア７と一体構造である弁体９がガ
イド９ａ、９ｂをガイドに摺動することにより弁体９の
フランジ上面９ｃがストッパ１２に当接、弁体９は弁座
部１０ｂから離れて間隙が形成される。Next, the operation will be described. When an operation signal is sent from the microcomputer of the engine to the drive circuit of the fuel injection valve 1, a current is applied to the coil 6 of the fuel injection valve 1, and a magnetic circuit composed of the armature 7, the core 5, the yoke 3, and the valve holder 4. Generates a magnetic flux, and the armature 7 is attracted to the core 5 side. When the valve body 9 integrated with the amateur 7 slides on the guides 9a and 9b as guides, the upper surface 9c of the flange of the valve body 9 comes into contact with the stopper 12, and the valve body 9 is separated from the valve seat 10b and a gap is formed. It is formed.
【００１４】高圧の燃料は、弁本体１０内部から該間隙
を通って弁座部１０ｂを通過する。弁座部１０ｂを通過
した燃料は、弁座部１０ｂより流路断面積の大きい通路
１０ｃを通過し、さらにその下流の、弁座部１０ｂより
流路断面積の大きい燃料流路１０ｄを通過する。そし
て、プレート１１に形成された噴射口１１ａにより調量
されて、図示されないエンジンの燃焼室内に噴射され
る。調量部である噴射口１１ａの傾斜方向及び燃料流路
１０ｄの傾斜方向より、燃料噴射弁１から噴射される燃
料の噴射方向が決定される。The high-pressure fuel passes from the inside of the valve body 10 through the gap to the valve seat 10b. The fuel that has passed through the valve seat portion 10b passes through a passage 10c having a larger flow passage cross-sectional area than the valve seat portion 10b, and further passes through a fuel flow passage 10d having a larger flow passage cross-sectional area than the valve seat portion 10b. . The fuel is metered by an injection port 11a formed in the plate 11 and injected into a combustion chamber of an engine (not shown). The injection direction of the fuel injected from the fuel injection valve 1 is determined from the inclination direction of the injection port 11a and the inclination direction of the fuel flow path 10d, which are the metering units.
【００１５】次に、エンジンのマイコンより、燃料噴射
弁１の駆動回路に動作の停止信号が送られると、コイル
６の電流の通電が停止し、磁気回路中の磁束が減少し
て、圧縮バネ１３の付勢により弁体９が閉弁方向に押し
出され、該間隙は閉じられて燃料噴射が終了する。Next, when a stop signal of the operation is sent from the microcomputer of the engine to the drive circuit of the fuel injection valve 1, the current supply to the coil 6 is stopped, the magnetic flux in the magnetic circuit is reduced, and the compression spring is turned off. By the urging of 13, the valve body 9 is pushed out in the valve closing direction, the gap is closed, and the fuel injection ends.
【００１６】なお、ガイド９ｂは、弁座面に対して弁体
９が非同軸になるのを規制する手段であるため、クリア
ランスはなるべく小さく設定されるのが好ましい。本実
施の形態では、弁体９の耐久磨耗を許容限度内とするた
め、１０μｍ以下（片側隙間で５μｍ以下）としてい
る。Since the guide 9b is a means for restricting the valve body 9 from being non-coaxial with the valve seat surface, the clearance is preferably set as small as possible. In the present embodiment, the thickness is set to 10 μm or less (5 μm or less at one side gap) in order to keep the durable wear of the valve body 9 within an allowable limit.
【００１７】以上のように、本実施の形態では、弁座部
１０ｂの下流にて形成された通路１０ｃと複数の噴射口
１１ａとを直接接続する燃料流路１０ｄを設けることに
より、二つの噴射口１１ａ間には弁本体１０と直接接触
する金属部１０ｅが形成されるため、この金属部１０ｅ
がエンジンの燃焼熱の放熱経路となってプレート１１の
温度が低温となり、カーボンデポジットの堆積が抑制さ
れ、このカーボンデポジットによる燃料の流量変化を抑
制させることができる。また、燃料流路１０ｄにより、
上記従来例の図９における面積Ｓが小さくでき、カーボ
ンデポジットの堆積を防ぐことができる。As described above, in the present embodiment, two fuel injection paths are provided by directly providing the fuel flow path 10d which connects the passage 10c formed downstream of the valve seat 10b and the plurality of injection ports 11a. Since a metal portion 10e that is in direct contact with the valve body 10 is formed between the ports 11a, the metal portion 10e
Serves as a heat radiation path for combustion heat of the engine, the temperature of the plate 11 becomes low, the deposition of carbon deposits is suppressed, and a change in the flow rate of fuel due to the carbon deposits can be suppressed. Further, the fuel flow path 10d allows
The area S in the conventional example shown in FIG. 9 can be reduced, and the deposition of carbon deposit can be prevented.
【００１８】なお、本実施の形態では、２つの噴射口１
１ａにそれぞれ対応して２つの第二の燃料流路１０ｄを
設けた構成としたが、複数の噴射口１１ａに対応して複
数の燃料流路１０ｄを設けた構成であれば、この限りで
はない。In this embodiment, the two injection ports 1
Although the configuration is such that two second fuel flow paths 10d are provided corresponding to the respective fuel injection ports 1a, the configuration is not limited as long as a plurality of fuel flow paths 10d are provided corresponding to the plurality of injection ports 11a. .
【００１９】実施の形態２．図４は、この発明の実施の
形態２による筒内噴射用燃料噴射弁における先端部分を
拡大した拡大断面図、図５は、図４の燃料噴射弁をＡ方
向から見た正面図である。図に示すように、本実施の形
態では、上記実施の形態１における弁座部１０ｂを含む
部分を弁本体１０とは別部材の弁座１４としたものであ
る。これにより、燃料流路１０ｄの加工を放電加工のみ
ならず、切削加工または研削加工で行えるようにして製
造コストを低減することができる。すなわち、上記実施
の形態１のように、弁座部１０ｂが弁本体１０と一体で
ある場合には、燃料流路１０ｄを切削加工または研削加
工によって形成すると、燃料流路１０ｄの上流側にでき
るバリの除去加工が困難である。しかし、当該箇所を弁
本体１０とは別部材の弁座１４とすることにより、バリ
の除去加工が可能となり、コストの安い切削加工または
研削加工が適用できる。Embodiment 2 FIG. FIG. 4 is an enlarged cross-sectional view of a front end portion of an in-cylinder fuel injection valve according to Embodiment 2 of the present invention, and FIG. 5 is a front view of the fuel injection valve of FIG. As shown in the figure, in the present embodiment, a portion including the valve seat portion 10b in the first embodiment is a valve seat 14 which is a separate member from the valve body 10. Thereby, the machining of the fuel flow path 10d can be performed not only by electric discharge machining but also by cutting or grinding, so that the production cost can be reduced. That is, when the valve seat 10b is integral with the valve body 10 as in the first embodiment, if the fuel passage 10d is formed by cutting or grinding, the fuel passage 10d can be formed on the upstream side of the fuel passage 10d. It is difficult to remove burrs. However, by forming the portion as the valve seat 14 which is a member separate from the valve body 10, burrs can be removed and low-cost cutting or grinding can be applied.
【００２０】また、弁座１４をメタルインジェクション
モールディングなどの金属成型法により製造すれば、上
記実施の形態１のように、放電加工で製造する場合に比
べて低コストであるのみならず、上述した切削加工に比
べて、燃料流路１０ｄの穴形状の成形自由度が高い。つ
まり、燃料流路１０ｄの燃料流れに直角な断面形状を円
形状の場合より小さい楕円形状にして燃料通路１０ｄの
断面積を小さくし、本発明の効果をより引き出すことが
できる。Further, when the valve seat 14 is manufactured by a metal molding method such as metal injection molding, the cost is lower than in the case where the valve seat 14 is manufactured by electric discharge machining as in the first embodiment. The degree of freedom in forming the hole shape of the fuel flow passage 10d is higher than in cutting. That is, the cross-sectional shape of the fuel flow path 10d perpendicular to the fuel flow is made elliptical smaller than that of a circular shape, the cross-sectional area of the fuel passage 10d is reduced, and the effect of the present invention can be further obtained.
【００２１】なお、切削加工、金属成形法により製造す
る場合は、弁座面に仕上げ加工を施したり、各部の面粗
さを小さくするために研磨処理を施す必要があることは
言うまでもない。In the case of manufacturing by cutting or metal forming, it is needless to say that it is necessary to finish the valve seat surface or to perform a polishing process to reduce the surface roughness of each part.
【００２２】実施の形態３．図６は、この発明の実施の
形態３による筒内噴射用燃料噴射弁における先端部分を
拡大した拡大断面図である。図に示すように、本実施の
形態では、上記実施の形態１における弁座部１０ｂの下
流部を、弁本体１０とは別部材の分配部１５として金属
成形で製造するものである。Embodiment 3 FIG. FIG. 6 is an enlarged cross-sectional view of a front end portion of a direct injection fuel injection valve according to Embodiment 3 of the present invention. As shown in the drawing, in the present embodiment, the downstream portion of the valve seat portion 10b in the first embodiment is manufactured by metal molding as the distribution portion 15 which is a separate member from the valve body 10.
【００２３】上記実施の形態２では、弁座部１０ｂの弁
座面及び弁座側摺動部といった精密な加工が要求される
部分が弁座１４に形成されている。これに対して、本実
施の形態では、精密な加工が要求される当該箇所を含ま
ないで弁本体１０と別部材にした分配部１５としたの
で、比較的粗い精度の加工方法で当該箇所を製造しつ
つ、燃料流路１０ｄ上流のバリ除去加工も可能である。
従って、上記実施の形態２よりもさらに製造コストを低
減することができる。In the second embodiment, the valve seat 14 is formed with a portion requiring precise machining, such as the valve seat surface of the valve seat portion 10b and the sliding portion on the valve seat side. On the other hand, in the present embodiment, since the distribution portion 15 is formed as a separate member from the valve body 10 without including the portion requiring precise processing, the portion is formed by a relatively coarse processing method. While manufacturing, it is also possible to remove burrs upstream of the fuel flow path 10d.
Therefore, the manufacturing cost can be further reduced as compared with the second embodiment.
【００２４】実施の形態４．図７は、この発明の実施の
形態４による筒内噴射用燃料噴射弁の先端部分の正面図
である。図に示すように、弁本体１０のエンジン燃焼室
側端面１０ａとプレート１１との溶接は、噴射口１１ａ
外側の環状の溶接部１１ｂの他に、噴射口１１ａ近傍に
さらに溶接箇所を増やしたものである。プレート１１を
弁本体１０から引き剥がす力がかかる噴射口１１ａ近傍
に溶接を行っているため、プレート１１と弁本体１０と
の溶接強度が増加させることができる。Embodiment 4 FIG. 7 is a front view of a distal end portion of an in-cylinder fuel injection valve according to Embodiment 4 of the present invention. As shown in the figure, welding between the engine combustion chamber side end face 10a of the valve body 10 and the plate 11 is performed by the injection port 11a.
In addition to the outer annular welded portion 11b, the number of welded portions is further increased near the injection port 11a. Since the welding is performed in the vicinity of the injection port 11a to which the force for peeling the plate 11 from the valve body 10 is applied, the welding strength between the plate 11 and the valve body 10 can be increased.
【００２５】プレート１１に対する引き剥がし力は、弁
体９の開弁時に、噴射口１１ａが調量部であるため、プ
レート１１の上流側と下流側との間に、燃料圧力の差Ｐ
による引き剥がし荷重がかかり、その大きさは、（π×
ｄ２）／４×Ｐとなる。本実施の形態による燃料噴射弁
を燃料圧力２０ＭＰａで使用する場合、ｄ＝２．５ｍｍ
として９８Ｎの引き剥がし荷重がかかる。このとき、プ
レート１１の溶接部の強度はプレート１１の厚さに依存
する。本実施の形態では、噴射口１１ａの口径がφ０．
１５ｍｍであり、噴射口１１ａをプレス加工で製造する
ため、プレート１１の厚さも０．１５ｍｍとしており、
非常に溶接強度が低いので、上述したような噴射口１１
ａ近傍の溶接箇所の増加は非常に有効である。When the valve body 9 is opened, the fuel pressure difference P between the upstream side and the downstream side of the plate 11 is determined because the injection port 11a is a metering section when the valve body 9 is opened.
Peeling load is applied, and its size is (π ×
d 2 ) / 4 × P. When the fuel injection valve according to the present embodiment is used at a fuel pressure of 20 MPa, d = 2.5 mm
As a peeling load of 98N. At this time, the strength of the welded portion of the plate 11 depends on the thickness of the plate 11. In the present embodiment, the diameter of the injection port 11a is φ0.
15 mm, and the thickness of the plate 11 is also set to 0.15 mm in order to manufacture the injection port 11a by pressing.
Since the welding strength is extremely low, the injection port 11 as described above is used.
It is very effective to increase the number of welding points near a.
【００２６】溶接箇所としては、図７（ａ）に示すよう
に、噴射口１１ａ外周と２つの噴射口１１ａ間にあるも
の、図７（ｂ）に示すように、噴射口１１ａ外周とこの
外周溶接箇所の内周部にあるもの、図７（ｃ）に示すよ
うに、噴射口１１ａ外周とこの外周溶接箇所の内周部に
あり、且つ両者が結合しているものなどが考えられる。
また、図に示したもの以外にも、所望の効果を得ること
ができれば種々の形態が考えられることは言うまでもな
い。As shown in FIG. 7 (a), the welding portion is located between the outer periphery of the injection port 11a and the two injection ports 11a, and as shown in FIG. 7 (b), the outer circumference of the injection port 11a and the outer circumference thereof. One at the inner periphery of the welded portion, as shown in FIG. 7C, one at the outer periphery of the injection port 11a and the inner periphery of the outer periphery welded portion and both are conceivable.
Needless to say, various modes other than those shown in the figures can be considered as long as a desired effect can be obtained.
【００２７】[0027]
【発明の効果】以上のように、請求項１記載の発明によ
れば、中空円筒型でその一端に複数の噴射口が形成され
た部材を有する弁座部が設けられた弁本体、電磁コイル
への通電により弁座部から離接して複数の噴射口から噴
射される燃料を制御する弁体、弁座部の下流と複数の噴
射口を接続する複数の噴射口と同数またはそれ以下の複
数の燃料流路を備えたので、噴射口上流でのカーボンデ
ポジットの堆積を防ぎ、このカーボンデポジットによる
燃料の流量変化を抑制させる効果が得られる。As described above, according to the first aspect of the present invention, the valve body and the electromagnetic coil provided with the valve seat having a hollow cylindrical member having a plurality of injection ports formed at one end thereof. A valve element that controls fuel injected from a plurality of injection ports by being separated from and coming into contact with the valve seat by energizing the valve, the same number or less than the plurality of injection ports that connect the downstream of the valve seat and the plurality of injection ports Since the fuel flow path is provided, the effect of preventing accumulation of carbon deposits upstream of the injection port and suppressing a change in fuel flow rate due to the carbon deposits can be obtained.
【００２８】また、請求項２記載の発明によれば、弁座
部と弁本体とは別の部材で構成され、弁座部は金属射出
成型または焼結で形成されるので、加工の自由度が高
く、コストの安い筒内噴射用燃料噴射弁を得る効果があ
る。According to the second aspect of the present invention, the valve seat and the valve main body are formed of different members, and the valve seat is formed by metal injection molding or sintering, so that the degree of freedom of processing can be improved. This has the effect of obtaining an in-cylinder fuel injection valve with high cost and low cost.
【００２９】また、請求項３記載の発明によれば、弁本
体と複数の燃料流路とは別の部材で構成され、燃料流路
は、金属射出成型または焼結で形成されるので、加工の
自由度が高く、コストの安い筒内噴射用燃料噴射弁を得
る効果がある。According to the third aspect of the present invention, the valve body and the plurality of fuel passages are formed of different members, and the fuel passage is formed by metal injection molding or sintering. This has the effect of obtaining an in-cylinder fuel injection valve having a high degree of freedom and a low cost.
【００３０】また、請求項４記載の発明によれば、複数
の噴射口が形成された部材と弁座部との接合箇所は、複
数の噴射口の近傍であるので、噴射口が形成されるプレ
ートと弁本体との接続を強固にすることができる効果が
得られる。According to the fourth aspect of the present invention, since the joint between the member having the plurality of injection ports and the valve seat is near the plurality of injection ports, the injection ports are formed. The effect that the connection between the plate and the valve body can be strengthened can be obtained.
【図１】 この発明の実施の形態１による筒内噴射用燃
料噴射弁を示す縦断面図である。FIG. 1 is a longitudinal sectional view showing an in-cylinder fuel injection valve according to Embodiment 1 of the present invention.
【図２】 この発明の実施の形態１による筒内噴射用燃
料噴射弁における先端部分を拡大した拡大断面図であ
る。FIG. 2 is an enlarged cross-sectional view in which a front end portion of the in-cylinder fuel injection valve according to Embodiment 1 of the present invention is enlarged.
【図３】 この発明の実施の形態１による筒内噴射用燃
料噴射弁の正面図である。FIG. 3 is a front view of the in-cylinder fuel injection valve according to Embodiment 1 of the present invention;
【図４】 この発明の実施の形態２による筒内噴射用燃
料噴射弁における先端部分を拡大した拡大断面図であ
る。FIG. 4 is an enlarged cross-sectional view illustrating a front end portion of a direct injection fuel injection valve according to Embodiment 2 of the present invention;
【図５】 この発明の実施の形態２による筒内噴射用燃
料噴射弁の正面図である。FIG. 5 is a front view of an in-cylinder fuel injection valve according to Embodiment 2 of the present invention;
【図６】 この発明の実施の形態３による筒内噴射用燃
料噴射弁における先端部分を拡大した拡大断面図であ
る。FIG. 6 is an enlarged cross-sectional view illustrating a front end portion of a direct injection fuel injection valve according to Embodiment 3 of the present invention;
【図７】 この発明の実施の形態３による筒内噴射用燃
料噴射弁の正面図である。FIG. 7 is a front view of a direct injection fuel injection valve according to Embodiment 3 of the present invention;
【図８】 従来の燃料噴射弁における先端部分を拡大し
た拡大断面図である。FIG. 8 is an enlarged cross-sectional view in which a front end portion of a conventional fuel injection valve is enlarged.
【図９】 従来の燃料噴射弁における先端部分を拡大し
た拡大断面図である。FIG. 9 is an enlarged cross-sectional view in which a front end portion of a conventional fuel injection valve is enlarged.
【図１０】 従来の燃料噴射弁における先端部分を拡大
した拡大断面図である。FIG. 10 is an enlarged cross-sectional view in which a front end portion of a conventional fuel injection valve is enlarged.
１ 燃料噴射弁、２ ソレノイド装置、３ ヨーク、４
弁ホルダ、５ コア、６ コイル、７ アマチュア、
８ 弁装置、９ 弁体、９ａ、９ｂ ガイド、９ｃ ス
トッパ、１０ 弁本体、１０ａ 燃焼室側端面、１０
ｂ 弁座部、１０ｃ 通路、１０ｄ 燃料流路、１１
プレート、１１ａ 噴射口、１１ｂ 溶接部、１２ ス
トッパ、１３ 圧縮バネ、１４ 弁座、１５ 分配部1 fuel injection valve, 2 solenoid device, 3 yoke, 4
Valve holder, 5 cores, 6 coils, 7 amateurs,
Reference Signs List 8 valve device, 9 valve element, 9a, 9b guide, 9c stopper, 10 valve body, 10a combustion chamber side end face, 10
b Valve seat, 10c passage, 10d fuel passage, 11
Plate, 11a Injection port, 11b Welded part, 12 Stopper, 13 Compression spring, 14 Valve seat, 15 Distributing part
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｆ０２Ｍ 61/18 ３４０ Ｆ０２Ｍ 61/18 ３４０Ｄ ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) F02M 61/18 340 F02M 61/18 340D
Claims (4)
形成された部材を有する弁座部が設けられた弁本体、電
磁コイルへの通電により上記弁座部から離接して上記複
数の噴射口から噴射される燃料を制御する弁体、上記弁
座部の下流と上記複数の噴射口を接続する上記複数の噴
射口と同数またはそれ以下の複数の燃料流路を備えたこ
とを特徴とする筒内噴射用燃料噴射弁。A valve body having a hollow cylindrical type having a member having a plurality of injection ports formed at one end thereof; a valve body provided; A valve body for controlling fuel injected from an injection port, comprising a plurality of fuel passages equal to or less than the plurality of injection ports connecting the plurality of injection ports downstream of the valve seat portion. In-cylinder fuel injection valve.
れ、上記弁座部は金属射出成型または焼結で形成される
ことを特徴とする請求項１記載の筒内噴射用燃料噴射
弁。2. The fuel for in-cylinder injection according to claim 1, wherein the valve seat and the valve body are formed of different members, and the valve seat is formed by metal injection molding or sintering. Injection valve.
構成され、上記燃料流路は、金属射出成型または焼結で
形成されることを特徴とする請求項１記載の筒内噴射用
燃料噴射弁。3. The in-cylinder according to claim 1, wherein the valve body and the plurality of fuel passages are formed of different members, and the fuel passage is formed by metal injection molding or sintering. Fuel injection valve for injection.
との接合箇所は、上記複数の噴射口の近傍であることを
特徴とする請求項１から３のいずれか一項に記載の筒内
噴射用燃料噴射弁。4. The joint according to claim 1, wherein the joint between the member having the plurality of injection ports and the valve seat is near the plurality of injection ports. In-cylinder fuel injection valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001172554A JP3664106B2 (en) | 2001-06-07 | 2001-06-07 | In-cylinder fuel injection valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001172554A JP3664106B2 (en) | 2001-06-07 | 2001-06-07 | In-cylinder fuel injection valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002364486A true JP2002364486A (en) | 2002-12-18 |
| JP3664106B2 JP3664106B2 (en) | 2005-06-22 |
Family
ID=19014158
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001172554A Expired - Fee Related JP3664106B2 (en) | 2001-06-07 | 2001-06-07 | In-cylinder fuel injection valve |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007091536A1 (en) * | 2006-02-07 | 2007-08-16 | Mikuni Corporation | Fuel injection valve |
| WO2016121475A1 (en) * | 2015-01-30 | 2016-08-04 | 日立オートモティブシステムズ株式会社 | Fuel injection valve |
-
2001
- 2001-06-07 JP JP2001172554A patent/JP3664106B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007091536A1 (en) * | 2006-02-07 | 2007-08-16 | Mikuni Corporation | Fuel injection valve |
| WO2016121475A1 (en) * | 2015-01-30 | 2016-08-04 | 日立オートモティブシステムズ株式会社 | Fuel injection valve |
| JPWO2016121475A1 (en) * | 2015-01-30 | 2017-08-31 | 日立オートモティブシステムズ株式会社 | Fuel injection valve |
| CN107208593A (en) * | 2015-01-30 | 2017-09-26 | 日立汽车系统株式会社 | Fuelinjection nozzle |
| US10415527B2 (en) | 2015-01-30 | 2019-09-17 | Hitachi Automotive Systems, Ltd. | Fuel injection valve |
| CN107208593B (en) * | 2015-01-30 | 2020-04-14 | 日立汽车系统株式会社 | Fuel injection valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3664106B2 (en) | 2005-06-22 |
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