JPH08105370A - Fuel injection valve and method for machining its valve part - Google Patents
Fuel injection valve and method for machining its valve partInfo
- Publication number
- JPH08105370A JPH08105370A JP24276794A JP24276794A JPH08105370A JP H08105370 A JPH08105370 A JP H08105370A JP 24276794 A JP24276794 A JP 24276794A JP 24276794 A JP24276794 A JP 24276794A JP H08105370 A JPH08105370 A JP H08105370A
- Authority
- JP
- Japan
- Prior art keywords
- needle
- valve
- seat
- grindstone
- fuel injection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Fuel-Injection Apparatus (AREA)
- Lift Valve (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、燃料噴射弁の構成要素
の一部であるニードルまたはボディバルブのシート部の
加工方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of processing a needle or a seat portion of a body valve, which is a part of a constituent element of a fuel injection valve.
【０００２】[0002]
【従来の技術】近年、排ガス規制を満足する内燃機関を
製作するにあたり、内燃機関に取り付けられる燃料噴射
弁の閉弁時における弁密精度を向上させるため、燃料噴
射弁の弁部分を構成するニードルのシート部またはボデ
ィバルブのシート部の加工精度を向上することが要求さ
れる。2. Description of the Related Art In recent years, in manufacturing an internal combustion engine satisfying exhaust gas regulations, a needle constituting a valve portion of the fuel injection valve is provided in order to improve valve tightness when a fuel injection valve attached to the internal combustion engine is closed. It is required to improve the processing accuracy of the seat portion of the body or the seat portion of the body valve.
【０００３】弁部分のシート部の加工方法としては、円
錐形状の砥石にその円錐の母線の方向にレシプロ運動を
与えつつ回転運動をさせて研削加工し、スパークアウト
時にレシプロ運動を停止する方法（特開昭５９−１８２
０５５号公報）や、ボディバルブとニードルとの間に研
磨剤を介在させ、このボディバルブとニードルとを相対
回転させる方法（特開昭６０−２４２９５６号公報）が
知られている。As a method for machining the seat portion of the valve portion, a grindstone having a conical shape is subjected to reciprocating motion in the direction of the generatrix of the cone while rotating to perform grinding, and the reciprocating motion is stopped when sparking out ( JP-A-59-182
No. 055), or a method of interposing an abrasive between the body valve and the needle and rotating the body valve and the needle relative to each other (JP-A-60-242956).
【０００４】また、テーパ面の加工方法としては、テー
ブル上に工作物を載せ、テーブルの回転軸線と円錐状砥
石との回転軸線とを一致させながら、砥石を移動して砥
石の円錐状研削面の一部を工作物の一部に当てることで
工作物にテーパ面を加工する方法（特開平３−７３２５
８号公報）が知られている。この特開平３−７３２５８
号公報のテーパ面の研削方法によると、テーパ面がどの
ように使用されるかについての用途の開示はなく、また
このテーパ面がバルブのシート面に使用されることの示
唆もない。Further, as a method of machining a tapered surface, a workpiece is placed on a table, and while the rotary axis of the table and the rotary axis of the conical grindstone are aligned with each other, the grindstone is moved to move the conical grind surface of the grindstone. Method for machining a taper surface on a work piece by applying a part of the work piece to a part of the work piece (JP-A-3-7325)
No. 8) is known. This Japanese Patent Laid-Open No. 3-73258
According to the method for grinding a tapered surface of Japanese Patent Publication, there is no disclosure of use as to how the tapered surface is used, and there is no suggestion that this tapered surface is used as a seat surface of a valve.
【０００５】[0005]
【発明が解決しようとする課題】ところで、前記特開昭
５９−１８２０５５号公報のものによると、砥石のシー
ト面への接触状態が一辺のみであるため、設備振動等の
外乱の影響を受けやすいことから、加工後のシート面の
真円度が０．６μｍ程度にしか向上せず、逆に面粗さは
２μｍ程度に劣化してしまう。By the way, according to the one disclosed in Japanese Patent Laid-Open No. 59-182055, since the contact state of the grindstone with the seat surface is only one side, it is easily affected by disturbance such as equipment vibration. Therefore, the roundness of the sheet surface after processing is improved only to about 0.6 μm, and conversely, the surface roughness deteriorates to about 2 μm.
【０００６】また、前記特開昭６０−２４２９５６号公
報のものによると、ボディバルブとニードルとが互いの
シート面を全周にわたって拘束する状態で加工するの
で、ボディバルブに０．２〜０．８μｍ程度の凹みが生
じ、ボディバルブとニードルとのシート面の密着性が良
過ぎるために弁作動時の開弁動作に時間的遅れが発生す
るという問題がある。この問題解決のため、ボディバル
ブとニードルとのシート面を線接触に近い形状とするに
は、ある程度の角度差を設ける必要があり、このためボ
ディバルブとニードルとのシート面加工には別の角度を
有する砥石で別々に加工することが必要となる。According to the above-mentioned Japanese Patent Laid-Open No. 60-242956, the body valve and the needle are machined in such a state that the seat surfaces of the body valve and the needle are constrained over the entire circumference. There is a problem that a recess of about 8 μm occurs and the close contact between the seat surface of the body valve and the needle is too good, resulting in a time delay in the valve opening operation during valve operation. In order to solve this problem, it is necessary to provide a certain angle difference in order to make the seat surface of the body valve and the needle close to line contact. It is necessary to separately process with a grindstone having an angle.
【０００７】本発明は、ニードルが弁座に着座する閉弁
時における弁密精度の良好な燃料噴射弁を提供すること
を目的とする。併せて、本発明は、弁部分のシート部の
面粗さを短期間で向上可能な弁部の加工方法を提供する
ことを目的とする。It is an object of the present invention to provide a fuel injection valve having good valve tightness when the needle is seated on the valve seat when the valve is closed. In addition, an object of the present invention is to provide a method for processing a valve portion that can improve the surface roughness of the seat portion of the valve portion in a short period of time.
【０００８】[0008]
【課題を解決するための手段】本発明の燃料噴射弁は、
請求項１によると、往復運動可能なニードルが着座する
弁座を有する燃料噴射弁において、前記弁座に着座する
前記ニードルのシート部は、前記弁座のシート部の傾斜
角度と異なる傾斜角度を有する円錐形状であることを特
徴とする構成を採用する。The fuel injection valve of the present invention comprises:
According to claim 1, in a fuel injection valve having a valve seat on which a reciprocating needle is seated, the seat portion of the needle seated on the valve seat has an inclination angle different from the inclination angle of the seat portion of the valve seat. A configuration characterized by having a conical shape is adopted.
【０００９】請求項２による燃料噴射弁は、請求項１記
載の構成において、前記ニードルのシート部または前記
弁座のシート部の少なくとも一方の真円度は０．０５μ
ｍ以下かつ面粗さＲｚが０．３μｍ以下であることを特
徴とする。請求項３による弁部のシート部の加工方法
は、ニードルが着座する弁部のシート部を形成するため
のシート部の加工方法であって、円錐状砥石を使用し、
前記弁部のシート部加工中に前記シート部から前記砥石
を離間する動作と接触させる動作とを少なくとも各々１
回以上行うことを特徴とする。According to a second aspect of the fuel injection valve of the first aspect, the roundness of at least one of the seat portion of the needle and the seat portion of the valve seat is 0.05 μ.
m or less and the surface roughness Rz is 0.3 μm or less. A method of processing a seat portion of a valve portion according to claim 3 is a method of processing a seat portion for forming a seat portion of a valve portion on which a needle is seated, using a conical grindstone,
At least one of an operation of separating the grindstone from the seat portion and an operation of bringing the grindstone into contact with each other during processing of the seat portion of the valve portion
It is characterized by being performed more than once.
【００１０】[0010]
【作用および発明の効果】請求項１の燃料噴射弁による
と、前記弁座に着座する前記ニードルのシート部は、前
記弁座のシート部の傾斜角度と異なる傾斜角度を有する
円錐形状であることから、前記ニードルとボディの前記
シート部が線接触状態となり、開弁時間の後れの問題を
防止することができる。According to the fuel injection valve of the first aspect, the seat portion of the needle seated on the valve seat has a conical shape having an inclination angle different from the inclination angle of the seat portion of the valve seat. Therefore, the needle and the seat portion of the body are in line contact with each other, and the problem of delay in valve opening time can be prevented.
【００１１】請求項２による燃料噴射弁は、請求項１記
載の構成において、前記ニードルのシート部または前記
弁座のシート部の少なくとも一方の真円度は０．０５μ
ｍ以下かつ面粗さＲｚが０．３μｍ以下であることか
ら、実験で確認されているように、効果的に燃料の漏れ
を防止することができる。請求項３の弁座の加工方法に
よると、円錐形状の砥石の押当てによってシート面を加
工するにあたり、加工途中で砥石と弁座のシート面とを
離し、砥石と弁座のシート面の接触状態を変え、シート
面の削り残し凸部を新たに切削加工する。そのため、シ
ート面の面粗さを短時間で向上するように加工すること
ができる。According to a second aspect of the fuel injection valve of the first aspect, the roundness of at least one of the seat portion of the needle and the seat portion of the valve seat is 0.05 μ.
Since the surface roughness Rz is m or less and the surface roughness Rz is 0.3 μm or less, it is possible to effectively prevent fuel leakage, as confirmed by experiments. According to the valve seat machining method of claim 3, when the seat surface is machined by pressing the conical grindstone, the grindstone and the seat surface of the valve seat are separated from each other during the machining, and the grindstone and the seat surface of the valve seat come into contact with each other. The state is changed, and the uncut portion of the seat surface is newly cut. Therefore, the surface roughness of the sheet surface can be processed in a short time.
【００１２】[0012]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。図１は、ガソリン機関の燃料供給装置に本発明を
適用した燃料噴射弁を示す。この燃料噴射弁の概要をま
ず説明する。燃料噴射弁のボディ４に形成される案内孔
の内部にニードル１が移動可能に収納される。そして、
電磁コイル１８が通電されると、ボディ４底部の弁座４
ｂに着座していたニードル１が吸引される。すると、ニ
ードル１と弁座４ｂとの間に隙間ができ、この隙間を燃
料は通過し、ボディ４の底部に形成された燃料噴射孔２
１から噴射される。そして、電磁コイル１８への通電中
は燃料は噴射され続け、通電が終了するとニードル１は
再び弁座４ｂに着座し燃料噴射は終了する。ここで燃料
噴射弁の磁性材料からなる略円筒状のハウジング１６内
には、軸方向に固定鉄心１４、可動コア７、ニードル
１、ボディ４等が設けられる。ハウジング１６の内周に
は、樹脂製のスプール１７が固定される。このスプール
１７には、電磁コイル１８が巻装される。ハウジング１
６の中径部８３の内部には、中空円板状のスペーサ６を
介してボディ４が挿入される。このボディ４の内部に
は、後述のニードル１のガイド部２および３が摺動する
円筒面４ａと、ニードル１の円錐状のシート部１２が着
座する弁座４ｂとが形成される。さらに、ボディ４の底
部中央には、燃料噴射孔２１が形成される。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a fuel injection valve in which the present invention is applied to a fuel supply device for a gasoline engine. The outline of this fuel injection valve will be described first. The needle 1 is movably accommodated in a guide hole formed in the body 4 of the fuel injection valve. And
When the electromagnetic coil 18 is energized, the valve seat 4 at the bottom of the body 4
The needle 1 seated on b is sucked. Then, a gap is formed between the needle 1 and the valve seat 4b, the fuel passes through this gap, and the fuel injection hole 2 formed at the bottom of the body 4
It is jetted from 1. Then, the fuel is continuously injected while the electromagnetic coil 18 is energized, and when the energization is completed, the needle 1 is seated again on the valve seat 4b and the fuel injection is completed. Here, a fixed iron core 14, a movable core 7, a needle 1, a body 4, etc. are provided in an axial direction in a substantially cylindrical housing 16 made of a magnetic material of the fuel injection valve. A resin spool 17 is fixed to the inner circumference of the housing 16. An electromagnetic coil 18 is wound around the spool 17. Housing 1
The body 4 is inserted into the middle diameter portion 83 of the body 6 through the spacer 6 having a hollow disc shape. Inside the body 4, a cylindrical surface 4a on which guide portions 2 and 3 of a needle 1 described later slide and a valve seat 4b on which a conical seat portion 12 of the needle 1 is seated are formed. Further, a fuel injection hole 21 is formed in the center of the bottom of the body 4.
【００１３】ハウジング１６の小径部２２の空間には、
磁性材料からなり筒状に形成される可動コア７が設けら
れる。この可動コア７の外径はハウジング１６の小径部
２２内径よりやや小さく設定され、可動コア７はハウジ
ング１６の小径部２２内径に摺動可能に設けられる。ま
た、可動コア１の上端面は、上記固定鉄心１４の下端面
と所定の隙間を介して対向するように設けられる。さら
に、可動コア７の下端内周には、ニードル１が連結され
る。このニードル１と可動コア７の内周面とがレーザ溶
接されることによって、ニードル１と可動コア７とは一
体に連結される。また、可動コア７の上端面には、可動
コア７を図下方へ付勢し、ニードル１のシート部１２を
ボディ４の弁座４ｂに着座させるリターンスプリング１
１が設けられる。このリターンスプリング１１は、可動
コア７の内部から固定鉄心１４の内部へ突出し、固定鉄
心１４の内部に挿入固定されるアジャスティングパイプ
１０に支持される。そして、このアジャスティングパイ
プ１０の軸方向位置を調節することによって、このリタ
ーンスプリング１１の付勢力は調節される。また、固定
鉄心１４の上方には、燃料タンクから燃料ポンプ等によ
って圧送され、燃料噴射弁２０内に流入する燃料中のゴ
ミ等を除去するフィルタ１５が設けられる。そして、固
定鉄心１４内に流入する燃料は、アジャスティングパイ
プ１０、可動コア７とニードル１の接合部９に形成され
た平面逃がし部１３との隙間、さらには、ボディ４の円
筒面とニードル１のガイド部２および３に形成された平
面逃がし部１３との隙間を通過して、燃料噴射孔２１に
到る。また、固定鉄心１４のスプール１７の上方から突
出した部分の外周には、合成樹脂からなるコネクタ２０
が設けられる。そして、上記電磁コイル１８に電気的に
接続されるターミナル３４は、このコネクタ２０および
スプール１７に埋設される。このターミナル３４は図示
しない電子制御装置からワイヤハーネスを介して電気的
に接続される。In the space of the small diameter portion 22 of the housing 16,
A movable core 7 formed of a magnetic material and having a cylindrical shape is provided. The outer diameter of the movable core 7 is set to be slightly smaller than the inner diameter of the small diameter portion 22 of the housing 16, and the movable core 7 is slidably provided on the inner diameter of the small diameter portion 22 of the housing 16. The upper end surface of the movable core 1 is provided so as to face the lower end surface of the fixed iron core 14 with a predetermined gap. Further, the needle 1 is connected to the inner periphery of the lower end of the movable core 7. By laser welding the needle 1 and the inner peripheral surface of the movable core 7, the needle 1 and the movable core 7 are integrally connected. A return spring 1 is provided on the upper end surface of the movable core 7 to urge the movable core 7 downward in the drawing to seat the seat portion 12 of the needle 1 on the valve seat 4b of the body 4.
1 is provided. The return spring 11 projects from the inside of the movable core 7 to the inside of the fixed iron core 14, and is supported by the adjusting pipe 10 which is inserted and fixed inside the fixed iron core 14. The biasing force of the return spring 11 is adjusted by adjusting the axial position of the adjusting pipe 10. Further, above the fixed iron core 14, a filter 15 for removing dust and the like in the fuel that is pumped from the fuel tank by a fuel pump or the like and flows into the fuel injection valve 20 is provided. Then, the fuel flowing into the fixed iron core 14 is adjusted by the adjusting pipe 10, the clearance between the movable core 7 and the flat relief portion 13 formed in the joint portion 9 of the needle 1, and further the cylindrical surface of the body 4 and the needle 1. Through the clearance with the plane relief portion 13 formed in the guide portions 2 and 3 and reaches the fuel injection hole 21. Further, on the outer periphery of the portion of the fixed iron core 14 projecting from above the spool 17, a connector 20 made of synthetic resin is provided.
Is provided. The terminal 34 electrically connected to the electromagnetic coil 18 is embedded in the connector 20 and the spool 17. The terminal 34 is electrically connected from an electronic control unit (not shown) via a wire harness.
【００１４】図示しない電子制御装置によってコネクタ
２０のターミナル３４を介して電磁コイル１８が通電さ
れると、電磁コイル１８に励磁電流が流れ、電磁コイル
１８は電磁力を発生する。この電磁力によって、可動コ
ア７と可動コア７に連結されたニードル１とは、リター
ンスプリング１１の付勢力に抗して固定鉄心１４の方向
へ吸引され、フランジ５とスペーサ６とが衝突するまで
上昇する。そして、ニードル１と可動コア７とはこの衝
突位置で、電磁コイル１８の電磁力により保持される。
その後、電磁コイル１８への噴射制御信号が出力されな
くなり、電磁力が作用しなくなると、リターンスプリン
グ１１の付勢力により、ニードル１は下降し、ボディ４
の弁座４ｂと当接する。When the electromagnetic coil 18 is energized via the terminal 34 of the connector 20 by an electronic control unit (not shown), an exciting current flows through the electromagnetic coil 18 and the electromagnetic coil 18 generates an electromagnetic force. Due to this electromagnetic force, the movable core 7 and the needle 1 connected to the movable core 7 are attracted toward the fixed iron core 14 against the urging force of the return spring 11, until the flange 5 and the spacer 6 collide. To rise. Then, the needle 1 and the movable core 7 are held at this collision position by the electromagnetic force of the electromagnetic coil 18.
After that, when the injection control signal to the electromagnetic coil 18 is no longer output and the electromagnetic force ceases to act, the needle 1 descends due to the urging force of the return spring 11, and the body 4
Of the valve seat 4b.
【００１５】図示しない燃料ポンプと圧力レギュレータ
とにより一定圧力に加圧された燃料は、固定鉄心１４上
部からフィルタ１５、アジャスティングパイプ１０、可
動コア７と接合部９に形成される平面逃がし部１３との
隙間を流入し、ボディ４の円筒面とニードル１のガイド
部２および３に形成された平面逃がし部１３との隙間を
通過して、弁座４ｂ上流に供給される。燃料は、ニード
ル１が上昇してから下降するまで、ニードル１のシート
部１２と弁座４ｂとの隙間から燃料噴射孔２１を通過
し、内燃機関の吸気弁へと向けて、図示しない吸気マニ
ホールド壁面に、燃料がなるべく付着しないように噴射
される。The fuel pressurized to a constant pressure by a fuel pump and a pressure regulator not shown in the drawing is a flat relief portion 13 formed on the fixed core 14 from above the filter 15, the adjusting pipe 10, the movable core 7 and the joint 9. Flows in through the gap between the cylindrical surface of the body 4 and the plane relief portions 13 formed in the guide portions 2 and 3 of the needle 1, and is supplied upstream of the valve seat 4b. The fuel passes through the fuel injection hole 21 from the gap between the seat portion 12 of the needle 1 and the valve seat 4b until the needle 1 ascends and descends, toward the intake valve of the internal combustion engine and toward the intake manifold (not shown). The fuel is injected to the wall surface so that the fuel does not adhere to it as much as possible.
【００１６】ニードル１の先端部の円錐斜面は、図３に
示すように、第１の円錐面４１ａと第２の円錐面４１ｂ
とにより円環状の段部を境にして二種の傾斜角をもつ斜
面に形成されている。第１の円錐面４１ａは相対的に急
斜面に形成され、第２の円錐面は相対的に緩斜面に形成
されている。ボディ４の弁座のシート部の斜面は第１の
円錐面４１ａの傾斜角と第２の円錐面４１ｂの傾斜角と
の間の角度に設定されている。これは、弁座のシート部
からのニードルのシート部の開弁時、円環状の線接触に
よって開弁性を向上するためである。As shown in FIG. 3, the conical inclined surface at the tip of the needle 1 has a first conical surface 41a and a second conical surface 41b.
Is formed into a slope having two kinds of inclination angles with the annular step as a boundary. The first conical surface 41a is relatively steep and the second conical surface is relatively gentle. The slope of the seat portion of the valve seat of the body 4 is set to an angle between the inclination angle of the first conical surface 41a and the inclination angle of the second conical surface 41b. This is to improve the valve openability by the annular line contact when the seat portion of the needle is opened from the seat portion of the valve seat.
【００１７】次に、燃料噴射弁の構成部品のひとつであ
るニードルのシート部の製造方法について、図２、図３
および図４に基づいて説明する。図２は、ニードルのシ
ート部を加工する装置を示す。図２において、４１はニ
ードル１に相当するワーク、２５はスピンドル、３０は
フレキシブルチャック、２７は砥石、２８はワーク４１
を回転可能に支持する案内孔２８ａを有するガイド、２
９はワーク４１を砥石２７に押しつける圧縮コイルスプ
リングである。フレキシブルチャック３０は、ワーク４
１を掴むもので、前後方向移動、左右方向移動および傾
斜角変更可能である。砥石２７は、板状で、その板厚方
向に貫通孔２７ａを有し、図２で貫通孔２７ａの上側に
円錐面２７ｂを有する。Next, the manufacturing method of the seat portion of the needle, which is one of the components of the fuel injection valve, will be described with reference to FIGS.
And it demonstrates based on FIG. FIG. 2 shows an apparatus for processing the seat portion of the needle. In FIG. 2, 41 is a work corresponding to the needle 1, 25 is a spindle, 30 is a flexible chuck, 27 is a grindstone, and 28 is a work 41.
Having a guide hole 28a for rotatably supporting the
Reference numeral 9 is a compression coil spring that presses the work 41 against the grindstone 27. The flexible chuck 30 is the work 4
It grasps 1 and can be moved in the front-rear direction, moved in the left-right direction, and can change the inclination angle. The grindstone 27 is plate-shaped, has a through hole 27a in the plate thickness direction, and has a conical surface 27b above the through hole 27a in FIG.
【００１８】ニードル１のシート部加工時、まずフレキ
シブルチャック３０によりワーク４１の図２で上端を掴
み、スピンドル２５を回転させることで、ワーク４１に
矢印３２方向に回転運動を与える。次いで、スピンドル
２５を降下し、ガイド２８の案内孔２８ａにワーク４１
を図２で下方向に挿通し、更にスピンドル２５を降下す
ると、やがてワーク４１の下端部分の円錐面４１ａが砥
石２７の円錐面２７ｂに接触する。その後、圧縮コイル
スプリング２９が所定量たわむ位置までスピンドル２５
を降下し、ワーク４１の円錐面４１ａと砥石２７の一部
分とを接触させてワーク４１の円錐面４１ａに相当する
ワーク下端の円錐斜面を切削加工する。When the seat portion of the needle 1 is processed, first, the upper end of the work 41 in FIG. 2 is grasped by the flexible chuck 30 and the spindle 25 is rotated, so that the work 41 is rotated in the direction of the arrow 32. Next, the spindle 25 is lowered, and the work 41 is inserted into the guide hole 28a of the guide 28.
2, the spindle 25 is further lowered, and then the conical surface 41a of the lower end portion of the work 41 comes into contact with the conical surface 27b of the grindstone 27. After that, the spindle 25 moves to a position where the compression coil spring 29 bends by a predetermined amount.
And the conical surface 41a of the work 41 and a part of the grindstone 27 are brought into contact with each other to cut the conical inclined surface at the lower end of the work corresponding to the conical surface 41a of the work 41.
【００１９】加工の際には、例えば図３にワーク４１の
下端部分と砥石２７との接触部分の拡大図を示すよう
に、ワーク４１の円錐面４１ａと砥石２７の一部分とを
接触させ、この最初（第１回）の接触状態を所定期間例
えば数秒保持した後、スピンドル２５を回転させながら
僅かに上昇し、砥石２７からワーク４１を離間する。次
いで、スピンドル２５を回転させながら再度降下し、ワ
ーク４１の円錐面４１ａと砥石２７の一部分とを接触さ
せ、この第２回の接触状態を所定期間例えば数秒保持
し、その後に砥石２７からワーク４１を離間する。以
降、必要に応じて、第３回以降のワーク４１の円錐面４
１ａと砥石２７の一部分との接触動作と離間動作とを繰
り返し行い、ワーク下端の斜面を切削加工する。During processing, for example, as shown in an enlarged view of the contact portion between the lower end portion of the work 41 and the grindstone 27 in FIG. 3, the conical surface 41a of the work 41 and a part of the grindstone 27 are brought into contact with each other. After maintaining the initial (first) contact state for a predetermined period of time, for example, several seconds, the spindle 41 is slightly raised while rotating the spindle 25 to separate the workpiece 41 from the grindstone 27. Then, the spindle 25 is lowered again while rotating to bring the conical surface 41a of the work 41 into contact with a part of the grindstone 27, and the second contact state is maintained for a predetermined period of time, for example, several seconds, and thereafter, the grindstone 27 removes the work 41. Separate. After that, if necessary, the conical surface 4 of the work 41 after the third time
The contacting operation and the separating operation between 1a and a part of the grindstone 27 are repeated to cut the slope of the lower end of the work.
【００２０】このとき、ワーク４１の円錐面４１ａと砥
石２７が前述のように複数回接触するとき、各接触回毎
にワーク４１の円錐面４１ａと砥石２７との接触状態が
変化し、砥石中の砥粒がワーク４１の円錐面４１ａに当
接する位置は、各接触回毎に微小距離ずれる。図４
（ａ）と図４（ｂ）は、砥石２７とワーク４１との最初
の接触状態と再度の接触状態の一例を模式的にに示すも
のである。At this time, when the conical surface 41a of the work 41 and the grindstone 27 come into contact with each other a plurality of times as described above, the contact state between the conical surface 41a of the work 41 and the grindstone 27 changes at each contact time. The position where the abrasive grains contact the conical surface 41a of the work 41 is deviated by a small distance for each contact. FIG.
4A and FIG. 4B schematically show an example of the initial contact state and the re-contact state of the grindstone 27 and the work 41.
【００２１】最初の接触状態では砥石２７とワーク４１
のシート面との接触がワーク４１の円錐状斜面の全周に
わたって円環状に接触面が形成されるため、機械振動等
の外乱振動の影響を受けにくく、砥石の凸部でニードル
シート面の凸部を除去する作用が働く。その結果、例え
ばワーク４１のシート面は真円度０．５μｍ以下の精度
が得られる。In the initial contact state, the grindstone 27 and the work 41 are
Since the contact surface is formed in an annular shape over the entire circumference of the conical inclined surface of the work 41, it is less susceptible to disturbance vibration such as mechanical vibration, and the convex portion of the grindstone makes the convex portion of the needle seat surface convex. The action of removing the part works. As a result, for example, the roundness of the sheet surface of the work 41 is 0.5 μm or less.
【００２２】最初の接触状態で切削され残った凸部は、
第２回以降の再度の接触状態で、砥石により除去される
割合が多いため短期間でニードルのシート面の凸部を除
去することができる。これにより、ニードルのシート面
が所望の真円度と面粗さに短期間で切削加工される。本
実施例のシート面の加工方法によると、砥石の位置を固
定し、切削加工を続けていくと、砥粒３３がワーク４１
のシート面に食い込むようになる。これにともない、砥
粒３３とシート面の接触面積が大きくなるため、面圧が
低下し、加工が進展しにくくなり、所望の面粗さを有す
るには接触状態を保持する限り長時間の加工を要する。The convex portions remaining after cutting in the initial contact state are
In the contact state after the second time and thereafter, since a large proportion is removed by the grindstone, the convex portion on the seat surface of the needle can be removed in a short period of time. As a result, the seat surface of the needle is cut into the desired roundness and surface roughness in a short period of time. According to the sheet surface processing method of the present embodiment, when the position of the grindstone is fixed and the cutting process is continued, the abrasive grains 33 form the work 41.
Will start to bite into the seat surface. Along with this, since the contact area between the abrasive grains 33 and the sheet surface becomes large, the surface pressure is reduced, and the processing is less likely to progress. In order to have a desired surface roughness, processing for a long time as long as the contact state is maintained. Requires.
【００２３】最初の接触状態から、砥石とニードルのシ
ート部とを離間すると、ニードル１に相当するワーク４
１とガイド２８との間には５〜１０μｍのクリアランス
があるので、砥石２７とワーク４１とを再度接触させた
場合、前回の接触位置とは異なる接触状態となるため、
例えば図４（ｂ）に示すように前回のシート面加工残り
凸部を加工する。これにより、短時間でニードルのシー
ト面に所望の面粗さを得ることができる。When the grindstone and the seat portion of the needle are separated from the initial contact state, the work 4 corresponding to the needle 1
Since there is a clearance of 5 to 10 μm between the 1 and the guide 28, when the grindstone 27 and the work 41 are brought into contact with each other again, a contact state different from the previous contact position is obtained.
For example, as shown in FIG. 4 (b), the previous sheet surface processing residual convex portion is processed. This makes it possible to obtain a desired surface roughness on the seat surface of the needle in a short time.
【００２４】次に、シート部の加工によって得られたニ
ードルのシート面精度と油密との関係について述べる。
ニードルはボディバルブのシート面に当接したとき弁閉
状態となり、ボディバルブのシート面からニードルが離
間したときに弁開状態となる。したがって、油密（燃料
漏れ量）は、ニードルとボディバルブのシート面の隙間
の大きさによって変化することは明らかであるから、こ
の油密の精度を向上するためには、シート面の真円度お
よび面粗さを向上させる必要がある。Next, the relationship between the seat surface accuracy of the needle obtained by processing the seat portion and the oil tightness will be described.
The needle is closed when it comes into contact with the seat surface of the body valve, and is opened when the needle is separated from the seat surface of the body valve. Therefore, it is clear that the oil tightness (fuel leakage amount) changes depending on the size of the clearance between the needle and the seat surface of the body valve. It is necessary to improve the degree and surface roughness.
【００２５】実験の結果、ボディバルブのシート面およ
びニードルのシート面の少なくとも一方の真円度は０．
５μｍ以下、面粗さは０．３μｍＲｚ以下にすることが
必要であることが判明した。このような条件のもとで
は、ニードルを弁座に着座させたときの燃料漏れ量（油
密）は所望の０．８ｍｍ3 ／分以下におさまった。次に
実験データを示す。 (1) 実験１（加工回数と面粗さの関係） 実験１は、加工回数と面粗さの関係を知る実験である。As a result of the experiment, the roundness of at least one of the seat surface of the body valve and the seat surface of the needle is 0.
It has been found that it is necessary to set the surface roughness to 5 μm or less and the surface roughness to 0.3 μm Rz or less. Under these conditions, the amount of fuel leakage (oil tightness) when the needle was seated on the valve seat was below the desired 0.8 mm 3 / min. Next, experimental data are shown. (1) Experiment 1 (relationship between the number of times of processing and surface roughness) Experiment 1 is an experiment to know the relationship between the number of times of processing and surface roughness.
【００２６】実験１において、ニードルのシート面を砥
石により切削加工するとき、そのニードルと砥石の最初
の接触状態にあるときを第１回加工とすると、第１回加
工の接触状態における砥石からニードルのシート面を離
間した後に砥石にニードルのシート面を接触させた状態
を第２回加工という。以下、第３回加工は第２回加工の
接触状態から離間状態にした後に再度接触した接触状態
をいう。以下、第４回加工以降同様である。この実験１
の結果を図５に示す。In Experiment 1, when the seat surface of the needle is cut by the grindstone, the first contact is when the needle and the grindstone are in the first contact state. The state in which the seat surface of the needle is brought into contact with the grindstone after the seat surface is separated is referred to as the second processing. Hereinafter, the third machining refers to a contact state in which the third machining is brought into a separated state from the contact state of the second machining and then re-contacted. The same applies to the fourth processing and thereafter. This experiment 1
The results are shown in FIG.
【００２７】実験１は、従来の比較例としての連続一回
加工について、接触状態の期間が３秒、６秒、９秒、１
２秒についてそれぞれ１０個のデータをとった。また本
発明の実施例としての複数回加工については、接触状態
３秒を２回、接触状態３秒を３回のものについてそれぞ
れ１０個のデータをとった。図５に示す実験結果から判
るように、複数回加工のものについては面粗さが平均し
て低い値になっていることが判る。これより、複数回加
工することにより面粗さの向上によって油密の精度が高
められることが推定される。 (2) 実験２（面粗さと油密の関係） 実験２は、ニードルのシート面の面粗さが油密にどのよ
うな影響を与えるかを測定した。実験結果を図６に示
す。Experiment 1 is a continuous comparative one-time machining as a conventional comparative example, and the period of the contact state is 3 seconds, 6 seconds, 9 seconds, 1
Ten data were taken for each 2 seconds. In addition, regarding the plural times of machining as an example of the present invention, 10 pieces of data were obtained for each of the contact state of 3 seconds twice and the contact state of 3 seconds 3 times. As can be seen from the experimental results shown in FIG. 5, it can be seen that the surface roughness is low on average for those processed multiple times. From this, it is estimated that the precision of oil tightness is improved by improving the surface roughness by processing a plurality of times. (2) Experiment 2 (Relationship between surface roughness and oil tightness) In Experiment 2, how the surface roughness of the seat surface of the needle affects the oil tightness was measured. The experimental results are shown in FIG.
【００２８】図６に示す実験結果から判るように、ニー
ドルのシート面の面粗さが大きいほど油密値（燃料漏れ
量）が増大していることが判る。実験結果からは、ニー
ドルのシート面の面粗さＲｚが０．３μｍ以下である
と、燃料漏れ量は０であることが判明した。上記実験か
ら、シート面の精度レベルとしては、ニードルのシート
部については真円度０．２〜０．４μｍが望ましく、ボ
ディバルブのシート部については面粗さ０．６〜０．８
μｍ、真円度０．５〜１．０μｍが望ましい。As can be seen from the experimental results shown in FIG. 6, the oil-tightness value (fuel leakage amount) increases as the surface roughness of the seat surface of the needle increases. From the experimental results, it was found that the fuel leakage amount was 0 when the surface roughness Rz of the seat surface of the needle was 0.3 μm or less. From the above experiment, as the accuracy level of the seat surface, a roundness of 0.2 to 0.4 μm is desirable for the seat portion of the needle, and a surface roughness of 0.6 to 0.8 for the seat portion of the body valve.
μm and roundness of 0.5 to 1.0 μm are desirable.
【００２９】前記実施例においては、ニードルのシート
面の加工の例について説明したが、本発明の他の実施例
としては、ボディバルブのシート面の加工にも同様に本
発明を適用することができる。このボディバルブのシー
ト面加工の場合、例えば図２に示す装置において砥石２
７に代えてボディバルブとし、ワーク４１に代えて砥石
とする装置にする。また、前記第１の実施例において、
砥石の固定、ワークの回転にして加工したが、本発明に
おいては、ワークの固定、砥石の回転にして加工しても
よい。In the above embodiment, an example of processing the seat surface of the needle has been described, but as another embodiment of the present invention, the present invention can be similarly applied to the processing of the seat surface of the body valve. it can. When processing the seat surface of this body valve, for example, in the device shown in FIG.
7 is a body valve, and the work 41 is a grindstone. Moreover, in the first embodiment,
The processing is performed by fixing the grindstone and rotating the work, but in the present invention, it may be processed by fixing the work and rotating the grindstone.
【図１】本発明の一実施例による燃料噴射弁の縦断面図
である。FIG. 1 is a vertical cross-sectional view of a fuel injection valve according to an embodiment of the present invention.
【図２】本発明のニードルのシート面を加工する装置を
示す模式的断面図である。FIG. 2 is a schematic cross-sectional view showing an apparatus for processing the seat surface of the needle of the present invention.
【図３】図２に示すIII 部分の拡大図である。FIG. 3 is an enlarged view of a portion III shown in FIG.
【図４】図３に示すIV部分の拡大図で、（ａ）は砥石と
ニードルとの最初の接触状態を示す図、（ｂ）は砥石と
ニードルとの再度の接触状態を示す図である。4 is an enlarged view of an IV portion shown in FIG. 3, (a) is a diagram showing a first contact state between the grindstone and the needle, and (b) is a diagram showing a re-contact state between the grindstone and the needle. .
【図５】実験データを示すもので、加工の態様と面粗さ
との関係を示すグラフである。FIG. 5 shows experimental data and is a graph showing a relationship between a processing mode and surface roughness.
【図６】実験データを示すもので、ニードルのシート面
の面粗さと油密の関係を示すグラフである。FIG. 6 is a graph showing experimental data, showing a relationship between surface roughness of a needle seat surface and oil tightness.
１ ニードル ４ ボディ ２５ スピンドル ２７ 砥石 ２８ ガイド ２９ 圧縮コイルスプリング ３０ フレキシブルチャック ３３ 砥粒 1 Needle 4 Body 25 Spindle 27 Grindstone 28 Guide 29 Compression Coil Spring 30 Flexible Chuck 33 Abrasive Grains
───────────────────────────────────────────────────── フロントページの続き (72)発明者 市川 仁 愛知県刈谷市昭和町１丁目１番地 日本電 装株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hitoshi Ichikawa 1-1-1, Showa-cho, Kariya city, Aichi prefecture Nihon Denso Co., Ltd.
Claims (3)
を有する燃料噴射弁において、前記弁座に着座する前記
ニードルのシート部は、前記弁部のシート部の傾斜角度
と異なる傾斜角度を有する円錐形状であることを特徴と
する燃料噴射弁。1. A fuel injection valve having a valve seat on which a reciprocating needle is seated, wherein a seat portion of the needle seated on the valve seat has an inclination angle different from an inclination angle of the seat portion of the valve portion. A fuel injection valve having a conical shape.
のシート部の少なくとも一方の真円度は０．０５μｍ以
下かつ面粗さＲｚが０．３μｍ以下であることを特徴と
する請求項１記載の燃料噴射弁。2. The roundness of at least one of the seat portion of the needle and the seat portion of the valve portion is 0.05 μm or less and the surface roughness Rz is 0.3 μm or less. Fuel injection valve.
成するためのシート部の加工方法であって、円錐状砥石
を使用し、前記弁部のシート部加工中に前記シート部か
ら前記砥石を離間する動作と接触させる動作とを少なく
とも各々１回以上行うことを特徴とする弁座のシート部
の加工方法。3. A method of processing a seat portion for forming a seat portion of a valve portion on which a needle is seated, wherein a conical grindstone is used, and the grindstone from the seat portion is used during the seat portion processing of the valve portion. A method of processing a seat portion of a valve seat, characterized in that at least one of each of the separating operation and the contacting operation is performed at least once.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24276794A JP3147140B2 (en) | 1994-10-06 | 1994-10-06 | Processing method of seat part of valve seat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24276794A JP3147140B2 (en) | 1994-10-06 | 1994-10-06 | Processing method of seat part of valve seat |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08105370A true JPH08105370A (en) | 1996-04-23 |
| JP3147140B2 JP3147140B2 (en) | 2001-03-19 |
Family
ID=17093980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24276794A Expired - Fee Related JP3147140B2 (en) | 1994-10-06 | 1994-10-06 | Processing method of seat part of valve seat |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3147140B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017170836A1 (en) * | 2016-04-01 | 2017-10-05 | 株式会社ヴァレオジャパン | Control valve |
| JP2018515720A (en) * | 2015-03-27 | 2018-06-14 | バット ホールディング アーゲー | valve |
| JP2018115629A (en) * | 2017-01-20 | 2018-07-26 | 株式会社デンソー | Fuel injection valve and manufacturing method thereof |
| WO2021143496A1 (en) * | 2020-01-19 | 2021-07-22 | 苏州纽威阀门股份有限公司 | Grinding device |
-
1994
- 1994-10-06 JP JP24276794A patent/JP3147140B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018515720A (en) * | 2015-03-27 | 2018-06-14 | バット ホールディング アーゲー | valve |
| WO2017170836A1 (en) * | 2016-04-01 | 2017-10-05 | 株式会社ヴァレオジャパン | Control valve |
| CN108779862A (en) * | 2016-04-01 | 2018-11-09 | 法雷奥日本株式会社 | Control valve |
| JPWO2017170836A1 (en) * | 2016-04-01 | 2018-12-27 | 株式会社ヴァレオジャパン | Control valve |
| JP2018115629A (en) * | 2017-01-20 | 2018-07-26 | 株式会社デンソー | Fuel injection valve and manufacturing method thereof |
| WO2021143496A1 (en) * | 2020-01-19 | 2021-07-22 | 苏州纽威阀门股份有限公司 | Grinding device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3147140B2 (en) | 2001-03-19 |
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