JP4254073B2 - Magnetostrictive fuel injection valve - Google Patents

Magnetostrictive fuel injection valve Download PDF

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Publication number
JP4254073B2
JP4254073B2 JP2001100827A JP2001100827A JP4254073B2 JP 4254073 B2 JP4254073 B2 JP 4254073B2 JP 2001100827 A JP2001100827 A JP 2001100827A JP 2001100827 A JP2001100827 A JP 2001100827A JP 4254073 B2 JP4254073 B2 JP 4254073B2
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Prior art keywords
magnetostrictive
fuel
element tube
magnetostrictive element
rod
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JP2001100827A
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JP2002295330A (en
Inventor
尚孝 調
敦哉 岡本
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Denso Corp
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Denso Corp
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Description

【0001】
【発明の属する技術分野】
この発明は、磁歪素子管と電磁コイルとを用いた燃料噴射弁に関する。
【0002】
【従来の技術】
気筒内への直接噴射式ガソリンエンジン(直噴機関)の燃料噴射弁として、電磁コイル内に棒状の超磁歪素子を配するとともに該超磁歪素子にニードル(弁体)を連結し、電磁コイルへの通電により該超磁歪素子に磁場を印加して伸縮させ、噴射ノズルの噴射孔を開閉する磁歪式燃料噴射弁が検討されている(特開平4−81565号公報)。また、特開平9−310654号公報には、超磁歪素子管内に棒状の弁体を配して噴射孔の内開きを可能にし、デポジットの弊害を防止した磁歪式燃料噴射弁が提案されている。
【0003】
【発明が解決しようとする課題】
従来の磁歪式燃料噴射弁は、燃料の流路が組み込まれた磁歪式燃料噴射弁のケーシング内に電磁コイルを収容しているため、燃料内に混入する微量の水分など腐食性物質が電磁コイルに浸透する問題が生じる。このため、電磁コイルが経時的に腐食し、長期間の使用に耐えられず実用性が低い欠点が存在する。
この発明の目的は、燃料内の腐食性物質が電磁コイルを腐食する不具合を確実に防止でき、長期間の使用が可能な磁歪式燃料噴射弁の提供にある。
【0004】
【課題を解決するための手段】
この発明の内燃機関の磁歪式燃料噴射弁は、内部が燃料通路となっており、一端に噴射ノズルが取り付けられ、他端に燃料導入管が連結され、外側が燃料通路ではない筒状のケーシングと、該ケーシング内に同軸的に挿設されるとともに一端が係止端、他端が自由端となっている磁歪素子管と、該磁歪素子管内に同軸的に挿設されるとともに、一端が前記噴射ノズル内に配された弁体に連結され、他端が前記磁歪素子管の自由端に係止したロッドと、燃料通路ではない前記ケーシングの外周に設置し前記磁歪素子管に磁場を印加する電磁コイルとから構成されている。
【0005】
【発明の効果】
この発明では、燃料通路の外側である筒状のケーシングの外周に、磁歪素子に磁場を印加する電磁コイルを設置している。このため、燃料内の腐食性物質が電磁コイルを腐食する不具合を防止でき長期間の使用が可能である。この場合に、電磁コイルの磁場を磁歪素子に効率的に印加させるために、ケーシングはステンレスパイプなど非磁性体の使用が望ましい。
【0006】
請求項1、3に記載の構成では、磁歪素子管の自由端には可動ブッシュが連結され、ロッドの他端には該可動ブッシュの端面に係合する鍔が設けられ、該鍔はスプリングにより一端方向に付勢されている。この構成により、噴射ノズルの弁口の内開きが容易に実現でき、外開きの場合の如く、デポジットが弁体に付着して噴射率が不正確になる不具合が確実に防止できる。
【0007】
請求項1、4に記載の構成では、燃料導入管内に、内部が燃料通路となっており、前記スプリングの付勢力を調節する調整(アジャスティング)パイプを螺合している。この調整パイプを回すことにより、バネ荷重の調整が簡単にできる。このため、簡単な作業で弁の開閉時間を揃えることが可能であり、噴射率を正確に調整できる。なお、調整パイプに振動による回動防止手段を付設しておくことが望ましい。
【0008】
請求項に記載の構成では、前記磁歪素子と前記ロッドとの熱膨張を近似させているので、簡単な構成で正確な燃料の温度上昇等による温度変化の補償を行うことができる。このため、広範囲な運転条件に応じて適正な噴射率制御を行うことが可能である。
【0009】
【発明の実施の形態】
図1は、この発明にかかる直噴ガソリンエンジンの磁歪式燃料噴射弁10を示し、内部が燃料通路11となっている円筒状のケーシング1を備えている。ケーシング1の上端には燃料導入管2が連結され、下端には噴射ノズル3が取り付けられている。燃料導入管2は、コモンレール等の高圧燃料供給源に連結され、噴射ノズル3はエンジンの気筒内に燃料の噴射を行う。
【0010】
ケーシング1は、非磁性体金属で形成され下端に内周縁12が設けられ、内部に円筒状の磁歪素子管4が挿設されている。磁歪素子管4は、下端41が内周縁12に係止され、上端42は自由端となっており、上方に伸長可能となっている。ケーシング1には、燃料導入管2の下端部がねじ込まれ、燃料導入管2の下端面21と磁歪素子管4の上端面43との間には、隙間22が設けられている。
【0011】
隙間22には、磁歪素子管4の上端42に接触して可動ブッシュ45が設置されており、該可動ブッシュ45の上面の外側部と燃料導入管2の下端面21との間に皿バネ44が介装されている。磁歪素子管4内には、可動ブッシュ45に上端部が位置決めされてロッド5が同軸的に挿通して配されている。ロッド5の線膨張は、磁歪素子管4の線膨張と一致させてあり、燃料の温度上昇による磁歪素子管4の伸びは、ロッド5の伸びで相殺されるようになっている。
【0012】
可動ブッシュ45には、ロッド5の上端部外周との間に燃料通路を確保するスリット46が形成されている。ロッド5の上端には燃料通路穴51を有する鍔部52が設けられており、鍔部52は、可動ブッシュ43の上面の内側部に係合しており、ロッド本体53は、可動ブッシュ45の内側および磁歪素子管4の中心を通じて下端が噴射ノズル3内に伸びている。
【0013】
燃料導入管2内には内部が燃料通路となっている調整パイプ23が螺合されており、調節パイプ23と、鍔部52との間にはスプリング24が介装されてロッド5を下方(閉弁側)に押圧している。調整パイプ23の回動によりスプリング24のバネ荷重が調節でき、開弁に要する作用力を増減できる。この結果、開弁時間を正確に調整でき、噴射率の適正制御に有効である。
【0014】
噴射ノズル3は、ケーシング1の下端に外嵌めされた円筒状のバルブボディ31と、該バルブボディ31の下端に嵌め込まれた強磁性体製ノズルボディ32とを備える。ノズルボディ32内には、ロッド本体53の下端54に連結された弁体としてのニードル6が挿入されている。ノズルボディ32の先端には噴射孔33が開けられており、内周にはシート面34が設けられている。
【0015】
ニードル6の上端は凹所61付き径大部62となっており、ロッド本体53の下端54が嵌着されている。ニードル6の下部には、径大部62と略同一直径の鍔63が設けられており、鍔63には燃料通路孔64が開けられている。鍔63は、ノズルボディ32の内周に摺動自在であるとともに、ニードル6を中心位置に保持する作用を有する。
【0016】
ケーシング1の外周には、磁歪素子管4に磁場を印加するための電磁コイル7が外嵌めされ、強磁性体製の外套管71で包囲されている。この実施例では、電磁コイル7は、ケーシング1に外嵌めされたボビン72と、該ボビン72に巻設した導電線73とからなる。なお、ケーシング1の外周に被覆導線を直接に巻き付けて電磁コイルを形成してもよいことは当然である。
【0017】
この発明では、制御回路8で電磁コイル7に通電すると、磁歪素子管4に磁場が印加され、磁歪素子管4が伸長し、自由端である上端42は上方に変位する。これにより、可動ブッシュ45は、皿バネ44を圧縮して上方に変位し、該可動ブッシュ45に係合した鍔部52を介してロッド5が上方に移動する。この結果、ロッド5に連結したニードル6が上方に移動し、噴射孔33が内開きして燃料の噴射がなされる。
【0018】
この実施例の構成によれば、電磁コイル7が、ケーシングの外(燃料通路の外に)配されているので、燃料に含まれる水など腐食性の液体により腐食することが確実に防止でき、耐久性に優れ、長期間の使用が可能な磁歪式燃料噴射弁が製造できる。また、燃料の温度上昇やデポジットによる噴射率の変化も有効に防止でき、噴射率の調整をすることが容易である。
【図面の簡単な説明】
【図1】この発明にかかる内燃機関の燃料噴射弁の断面図である。
【符号の説明】
1 ケーシング
10 磁歪式燃料噴射弁
11 燃料通路
2 燃料導入管
23 調整パイプ(アジャスティング)
24 スプリング
3 噴射ノズル
4 磁歪素子管
41 下端(係止端)
42 上端(自由端)
45 可動ブッシュ
5 ロッド
6 ニードル(弁体)
63 鍔
7 電磁コイル
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fuel injection valve using a magnetostrictive element tube and an electromagnetic coil.
[0002]
[Prior art]
As a fuel injection valve of a direct injection gasoline engine (direct injection engine) into a cylinder, a rod-shaped super magnetostrictive element is arranged in the electromagnetic coil, and a needle (valve element) is connected to the super magnetostrictive element, to the electromagnetic coil. A magnetostrictive fuel injection valve that opens and closes an injection hole of an injection nozzle by applying a magnetic field to the giant magnetostrictive element by expanding and contracting it has been studied (Japanese Patent Laid-Open No. 4-81565). Japanese Patent Application Laid-Open No. 9-310654 proposes a magnetostrictive fuel injection valve in which a rod-shaped valve element is arranged in a giant magnetostrictive element tube so that the injection hole can be opened, thereby preventing the harmful effects of deposit. .
[0003]
[Problems to be solved by the invention]
The conventional magnetostrictive fuel injection valve has an electromagnetic coil housed in the casing of the magnetostrictive fuel injection valve in which a fuel flow path is incorporated, so that corrosive substances such as a minute amount of moisture mixed in the fuel are electromagnetic coil. Problems that penetrate into For this reason, the electromagnetic coil corrodes with time, and there exists a fault which cannot endure long-term use and has low practicality.
An object of the present invention is to provide a magnetostrictive fuel injection valve that can reliably prevent a problem that a corrosive substance in fuel corrodes an electromagnetic coil and can be used for a long time.
[0004]
[Means for Solving the Problems]
The magnetostrictive fuel injection valve of the internal combustion engine of the present invention has a cylindrical casing in which the inside is a fuel passage, an injection nozzle is attached to one end, a fuel introduction pipe is connected to the other end, and the outside is not a fuel passage. And a magnetostrictive element tube coaxially inserted into the casing and having one end as a locking end and the other end being a free end, and being coaxially inserted into the magnetostrictive element tube and having one end A rod connected to the valve element disposed in the injection nozzle and having the other end engaged with the free end of the magnetostrictive element tube, and installed on the outer periphery of the casing that is not a fuel passage, applies a magnetic field to the magnetostrictive element tube And an electromagnetic coil.
[0005]
【The invention's effect】
In this invention, the electromagnetic coil which applies a magnetic field to a magnetostriction element is installed in the outer periphery of the cylindrical casing which is the outer side of a fuel passage. For this reason, the trouble which the corrosive substance in a fuel corrodes an electromagnetic coil can be prevented, and long-term use is possible. In this case, in order to efficiently apply the magnetic field of the electromagnetic coil to the magnetostrictive element, it is desirable to use a non-magnetic material such as a stainless steel pipe for the casing.
[0006]
According to the first and third aspects of the present invention, a movable bush is connected to the free end of the magnetostrictive element tube, and a hook that engages with the end surface of the movable bush is provided at the other end of the rod. It is biased in the direction of one end. With this configuration, the valve opening of the injection nozzle can be easily opened, and it is possible to reliably prevent the problem that the deposit adheres to the valve body and the injection rate becomes inaccurate as in the case of the external opening.
[0007]
The arrangement according to claim 1 and 4, the fuel introduction pipe, inside which a fuel passage is screwed an adjustment (the adjusting) pipe for adjusting the biasing force of the spring. The spring load can be easily adjusted by turning the adjusting pipe. For this reason, it is possible to make the opening and closing times of the valves uniform with a simple operation, and the injection rate can be adjusted accurately. In addition, it is desirable to attach the rotation prevention means by vibration to the adjustment pipe.
[0008]
In the configuration according to the second aspect , since the thermal expansion of the magnetostrictive element and the rod is approximated, it is possible to compensate for a temperature change due to an accurate temperature rise of the fuel with a simple configuration. For this reason, it is possible to perform appropriate injection rate control according to a wide range of operating conditions.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a magnetostrictive fuel injection valve 10 of a direct injection gasoline engine according to the present invention, and includes a cylindrical casing 1 having a fuel passage 11 inside. A fuel introduction pipe 2 is connected to the upper end of the casing 1, and an injection nozzle 3 is attached to the lower end. The fuel introduction pipe 2 is connected to a high-pressure fuel supply source such as a common rail, and the injection nozzle 3 injects fuel into the cylinder of the engine.
[0010]
The casing 1 is made of a non-magnetic metal, has an inner peripheral edge 12 at the lower end, and has a cylindrical magnetostrictive element tube 4 inserted therein. The magnetostrictive element tube 4 has a lower end 41 locked to the inner peripheral edge 12 and an upper end 42 which is a free end, and can be extended upward. A lower end portion of the fuel introduction pipe 2 is screwed into the casing 1, and a gap 22 is provided between the lower end face 21 of the fuel introduction pipe 2 and the upper end face 43 of the magnetostrictive element pipe 4.
[0011]
In the gap 22, a movable bush 45 is installed in contact with the upper end 42 of the magnetostrictive element tube 4, and a disc spring 44 is provided between the outer portion of the upper surface of the movable bush 45 and the lower end surface 21 of the fuel introduction pipe 2. Is intervening. In the magnetostrictive element tube 4, the rod 5 is coaxially inserted through the movable bush 45 with its upper end positioned. The linear expansion of the rod 5 is made to coincide with the linear expansion of the magnetostrictive element tube 4, and the elongation of the magnetostrictive element tube 4 due to the temperature rise of the fuel is offset by the elongation of the rod 5.
[0012]
The movable bush 45 is formed with a slit 46 for securing a fuel passage between the outer periphery of the upper end of the rod 5. A flange 52 having a fuel passage hole 51 is provided at the upper end of the rod 5. The flange 52 is engaged with the inner side of the upper surface of the movable bush 43, and the rod body 53 is connected to the movable bush 45. The lower end extends into the injection nozzle 3 through the inside and the center of the magnetostrictive element tube 4.
[0013]
An adjustment pipe 23 having a fuel passage inside is screwed into the fuel introduction pipe 2, and a spring 24 is interposed between the adjustment pipe 23 and the flange 52 so that the rod 5 moves downward ( (Pressing side closed) The spring load of the spring 24 can be adjusted by the rotation of the adjusting pipe 23, and the acting force required to open the valve can be increased or decreased. As a result, the valve opening time can be accurately adjusted, which is effective for proper control of the injection rate.
[0014]
The injection nozzle 3 includes a cylindrical valve body 31 fitted to the lower end of the casing 1 and a ferromagnetic nozzle body 32 fitted to the lower end of the valve body 31. In the nozzle body 32, a needle 6 as a valve body connected to the lower end 54 of the rod body 53 is inserted. An injection hole 33 is formed at the tip of the nozzle body 32, and a sheet surface 34 is provided on the inner periphery.
[0015]
The upper end of the needle 6 is a large diameter portion 62 with a recess 61, and the lower end 54 of the rod body 53 is fitted. A flange 63 having substantially the same diameter as the large diameter portion 62 is provided at the lower portion of the needle 6, and a fuel passage hole 64 is formed in the flange 63. The collar 63 is slidable on the inner periphery of the nozzle body 32 and has an action of holding the needle 6 at the center position.
[0016]
An electromagnetic coil 7 for applying a magnetic field to the magnetostrictive element tube 4 is fitted on the outer periphery of the casing 1 and surrounded by a ferromagnetic outer tube 71. In this embodiment, the electromagnetic coil 7 includes a bobbin 72 fitted on the casing 1 and a conductive wire 73 wound around the bobbin 72. Of course, the electromagnetic coil may be formed by directly winding the coated conductor around the casing 1.
[0017]
In the present invention, when the electromagnetic coil 7 is energized by the control circuit 8, a magnetic field is applied to the magnetostrictive element tube 4, the magnetostrictive element tube 4 expands, and the upper end 42, which is a free end, is displaced upward. As a result, the movable bush 45 compresses the disc spring 44 and is displaced upward, and the rod 5 moves upward via the flange 52 engaged with the movable bush 45. As a result, the needle 6 connected to the rod 5 moves upward, and the injection hole 33 opens inward to inject fuel.
[0018]
According to the configuration of this embodiment, since the electromagnetic coil 7 is disposed outside the casing (outside the fuel passage), it can be reliably prevented from being corroded by corrosive liquid such as water contained in the fuel, A magnetostrictive fuel injection valve that is excellent in durability and can be used for a long time can be manufactured. In addition, it is possible to effectively prevent changes in the injection rate due to a rise in fuel temperature or deposits, and it is easy to adjust the injection rate.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a fuel injection valve for an internal combustion engine according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Casing 10 Magnetostrictive fuel injection valve 11 Fuel passage 2 Fuel introduction pipe 23 Adjustment pipe (adjusting)
24 Spring 3 Injection nozzle 4 Magnetostrictive element tube 41 Lower end (locking end)
42 Upper end (free end)
45 Movable bush 5 Rod 6 Needle (valve)
63 鍔 7 Electromagnetic coil

Claims (4)

内部が燃料通路となっており、一端に噴射ノズルが取り付けられ、他端に燃料導入管が連結され、外側が燃料通路ではない筒状のケーシングと、該ケーシング内に同軸的に挿設されるとともに一端が係止端、他端が自由端となっている磁歪素子管と、該磁歪素子管内に同軸的に挿設されるとともに、一端が前記噴射ノズル内に配された弁体に連結され、他端が前記磁歪素子管の自由端に係止したロッドと、燃料通路ではない前記ケーシングの外周に設置し前記磁歪素子管に磁場を印加する電磁コイルとからなる磁歪式燃料噴射弁であって、
前記磁歪素子管の自由端には可動ブッシュが連結され、前記ロッドの他端には該可動ブッシュの端面に係合する鍔が設けられ、該鍔はスプリングにより一端方向に付勢され、
前記燃料導入管に前記スプリングの付勢力を調節するアジャスティングパイプを螺合したことを特徴とする磁歪式燃料噴射弁
The inside is a fuel passage, an injection nozzle is attached to one end, a fuel introduction pipe is connected to the other end, and a cylindrical casing whose outer side is not a fuel passage is coaxially inserted into the casing. A magnetostrictive element tube having one end as a locking end and the other end as a free end, and is coaxially inserted into the magnetostrictive element tube, and one end is connected to a valve element disposed in the injection nozzle. , met magnetostrictive fuel injector comprising a solenoid coil for applying a rod the other end engaged with the free end of the magnetostrictive element tube was placed in the outer periphery of the casing is not a fuel passage a magnetic field to the magnetostrictive element tube And
A movable bush is connected to the free end of the magnetostrictive element tube, and a hook that engages with an end surface of the movable bush is provided at the other end of the rod. The hook is biased in one direction by a spring,
2. A magnetostrictive fuel injection valve, wherein an adjusting pipe for adjusting a biasing force of the spring is screwed into the fuel introduction pipe .
内部が燃料通路となっており、一端に噴射ノズルが取り付けられ、他端に燃料導入管が連結され、外側が燃料通路ではない筒状のケーシングと、該ケーシング内に同軸的に挿設されるとともに一端が係止端、他端が自由端となっている磁歪素子管と、該磁歪素子管内に同軸的に挿設されるとともに、一端が前記噴射ノズル内に配された弁体に連結され、他端が前記磁歪素子管の自由端に係止したロッドと、燃料通路ではない前記ケーシングの外周に設置し前記磁歪素子管に磁場を印加する電磁コイルとからなる磁歪式燃料噴射弁であって、
前記ロッドの線熱膨張を前記磁歪素子管の線熱膨張に近似させたことを特徴とする磁歪式燃料噴射弁。
The inside is a fuel passage, an injection nozzle is attached to one end, a fuel introduction pipe is connected to the other end, and a cylindrical casing whose outer side is not a fuel passage is coaxially inserted into the casing. A magnetostrictive element tube having one end as a locking end and the other end as a free end, and is coaxially inserted into the magnetostrictive element tube, and one end is connected to a valve element disposed in the injection nozzle. A magnetostrictive fuel injection valve comprising a rod whose other end is locked to a free end of the magnetostrictive element tube, and an electromagnetic coil that is installed on the outer periphery of the casing that is not a fuel passage and applies a magnetic field to the magnetostrictive element tube. And
A magnetostrictive fuel injection valve characterized in that the linear thermal expansion of the rod approximates the linear thermal expansion of the magnetostrictive element tube .
請求項2に記載の磁歪式燃料噴射弁において、前記磁歪素子管の自由端には可動ブッシュが連結され、前記ロッドの他端には該可動ブッシュの端面に係合する鍔が設けられ、該鍔はスプリングにより一端方向に付勢されていることを特徴とする磁歪式燃料噴射弁。3. The magnetostrictive fuel injection valve according to claim 2, wherein a movable bush is connected to a free end of the magnetostrictive element tube, and a hook that engages with an end surface of the movable bush is provided at the other end of the rod. A magnetostrictive fuel injection valve characterized in that the rod is biased in one direction by a spring . 請求項3に記載の磁歪式燃料噴射弁において、前記燃料導入管に前記スプリングの付勢力を調節するアジャスティングパイプを螺合したことを特徴とする磁歪式燃料噴射弁。 4. The magnetostrictive fuel injection valve according to claim 3 , wherein an adjusting pipe for adjusting a biasing force of the spring is screwed into the fuel introduction pipe .
JP2001100827A 2001-03-30 2001-03-30 Magnetostrictive fuel injection valve Expired - Fee Related JP4254073B2 (en)

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