JPS612984A - Solenoid valve - Google Patents

Abstract

PURPOSE:To shorten the response time of a valve, by eliminate an increment in the weight of a contact pole to increase attraction force. CONSTITUTION:A plurality of tooth sections 4 angularly spaced from each other are formed in the conical outer peripheral surface of an iron core 3, and electrically conductive coils 5 are provided to these tooth sections 4 to generate magnetic poles on the outer end faces of tooth sections 4, and the winding directions of the electrically conductive coils 5 are angularly different from each other and therefore, these magnetic poles are made alternately different, in the angular direction, from each other from tooth section to tooth section. Further, a pipe- like contact pole element 6 is provided on the outer peripheral surface of the iron core 3 such that the inner peripheral surface of the contact pole element 6 is opposed to the outer peripheral end faces of the tooth sections 4 with air gaps therebetween. Accordingly, an increment in the weight of the contact pole element 6 is made small to increase attracting force, thereby it is possible to shorten the response time of the valve.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は内燃機関の燃料噴射装置のための電磁弁であっ
て、鉄心と導電コイルと接極子とを有し、導電コイルが
強磁性材料製の鉄心の上に装着されており、接極子が弁
体を保持している形式のものに関する。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a solenoid valve for a fuel injection device of an internal combustion engine, which has an iron core, a conductive coil, and an armature, and the conductive coil is made of a ferromagnetic material. It is mounted on the iron core of the valve, and the armature holds the valve body.

〔発明の背景〕[Background of the invention]

燃料噴射装置の電磁弁として、例えば特開昭５８−１３
３４６８号公報に示されるような平面接極子型電磁石を
用い、平面接極子にスプール弁が固定結合されたものが
ある。スプール弁を用いることにより弁動作への流体圧
力影響を小さくできるが弁ストロークがポペット弁など
に比べて大きくなる。この為、弁応答時間を短くする必
要から吸引力を大きくしようとすると、接極子径を大き
くして吸引部面積を増すことになり、接極子重量が大幅
に増して慣性力が大きくなる問題がある。As a solenoid valve for a fuel injection device, for example, JP-A-58-13
There is one in which a flat surface pole electromagnet as shown in Japanese Patent No. 3468 is used, and a spool valve is fixedly connected to the flat surface pole. By using a spool valve, the influence of fluid pressure on valve operation can be reduced, but the valve stroke is larger than that of a poppet valve or the like. Therefore, if you try to increase the suction force due to the need to shorten the valve response time, you will have to increase the diameter of the armature and increase the area of the suction part, which will significantly increase the weight of the armature and cause the problem of increased inertia. be.

〔発明の目的〕[Purpose of the invention]

本発明の目的は接極子重量の増大を少なく押えて吸引力
を大きくシ、弁の動作特性を向上した電磁弁を提供する
ことにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a solenoid valve which can suppress an increase in armature weight, increase suction force, and improve the operating characteristics of the valve.

〔発明の概要〕[Summary of the invention]

本発明は上記目的のため、特許請求の範囲にあるような
構成の電磁弁にその特徴がある。To achieve the above object, the present invention is characterized by a solenoid valve configured as set forth in the claims.

〔発明の実施例〕[Embodiments of the invention]

以ド、本発明の一実施例を第１図、第２図により説明す
る。弁ケーシング１内に案内部材２が取り付けられ、こ
の案内部材２の外周部に鉄心３が固定されている。鉄心
３はすぐばかさ歯車形状で、円錐外周面に複数個の角度
的に隔てられている歯形部４を有する。歯形部４には導
電コイル５が装着され、歯形部４の外周端面に磁極が発
生する、この磁極が各歯形部４ごと、角度方向で交互に
異なるように導電コイル５の巻方向が各々、角度方向で
交互に異なっている。鉄心３の外周部には管状の接極子
６が設けられ、この内周面が歯形部４の外周端面と空隙
を形成しながら対向している。Hereinafter, one embodiment of the present invention will be explained with reference to FIGS. 1 and 2. A guide member 2 is installed inside the valve casing 1, and an iron core 3 is fixed to the outer circumference of the guide member 2. The iron core 3 has a straight bevel gear shape and has a plurality of angularly spaced teeth 4 on its outer conical surface. A conductive coil 5 is attached to the toothed part 4, and a magnetic pole is generated on the outer peripheral end surface of the toothed part 4. The winding direction of the conductive coil 5 is set so that the magnetic pole is alternately different in the angular direction for each toothed part 4. Alternately different in angular direction. A tubular armature 6 is provided on the outer periphery of the iron core 3, and its inner periphery faces the outer periphery end surface of the toothed portion 4 while forming a gap therebetween.

接極子６にはスプール弁７が同軸的に結合され、スプー
ル弁７の鉄心３側に設けられた案内部８は案内部材２の
案内穴９に摺動可能に取り付いている。スプール弁７は
中心孔１０を有しており、弁ケーシング１に取り付けら
れた弁本体１１の内孔１２に摺動可能に嵌合している。A spool valve 7 is coaxially coupled to the armature 6, and a guide portion 8 provided on the iron core 3 side of the spool valve 7 is slidably attached to a guide hole 9 of the guide member 2. The spool valve 7 has a central hole 10 and is slidably fitted into an inner hole 12 of a valve body 11 attached to the valve casing 1 .

中心孔１０は一方では本体１３に形成された低圧室１４
に、もう一方ではスプール弁７の外周に設けられた制御
縁１５に通じている。本体１３に設けられた逃し通路１
６は弁本体１１の内孔１２まで伸びている。The central hole 10 on the one hand has a low pressure chamber 14 formed in the body 13.
On the other hand, it leads to a control lip 15 on the outer circumference of the spool valve 7. Escape passage 1 provided in main body 13
6 extends to the inner hole 12 of the valve body 11.

案内部材２内には閉鎖ばね１７が受容され、スプール弁
７を弁本体１１に押し付けて、逃し通路１６と制御縁１
５が合致しない状態にしている。A closing spring 17 is received in the guide member 2 and presses the spool valve 7 against the valve body 11 to close the relief passage 16 and the control lip 1.
5 does not match.

逃し通路１６と制御縁１５が合致すると逃し通路１６の
燃料が中心孔１０をへて低圧室１４に流出することがで
きる。When the relief passage 16 and the control edge 15 coincide, fuel in the relief passage 16 can flow out through the central hole 10 into the low pressure chamber 14.

上記構成においてその動作を説明する。The operation of the above configuration will be explained.

図示されていない制御装置から励磁電流が導電コイル５
に供給されると、磁束は点線で示したように流れ、鉄心
３の歯形部４外周端面と対向した接極子６の内周面に電
磁エネルギーを減少させる方向である軸方向に力が働く
、この吸引力により、接極子６と固定結合したスプール
弁７の案内部８が閉鎖ばね１７を抗して鉄心３側方向に
移動し、スプール弁７の制御縁１５が逃し通路１６と合
致して開弁状態圧する。このため、燃料は逃し通路１６
、中心孔１０をへて低圧室１４に流出するつ次に導電コ
イル５への励磁電流供給が止まると吸引力が働かないの
で、閉鎖ばね１７により、スプール弁７が弁本体１１方
向に向って移動し、逃し通路１６と制御縁１５が合致し
ない閉弁状態にする。An exciting current is supplied to the conductive coil 5 from a control device (not shown).
When supplied to the magnetic flux, the magnetic flux flows as shown by the dotted line, and a force is applied to the inner circumferential surface of the armature 6 facing the outer circumferential end surface of the toothed part 4 of the iron core 3 in the axial direction, which is the direction that reduces electromagnetic energy. Due to this suction force, the guide portion 8 of the spool valve 7 fixedly connected to the armature 6 moves toward the side of the core 3 against the closing spring 17, and the control edge 15 of the spool valve 7 aligns with the relief passage 16. Valve open state pressure. Therefore, the fuel escapes through the escape passage 16.
When the supply of excitation current to the conductive coil 5 is stopped, the attraction force does not work, so the closing spring 17 causes the spool valve 7 to move toward the valve body 11. The valve is moved to a closed state where the relief passage 16 and the control edge 15 do not match.

このため、燃料は逃し通路１６から流出しなくなる。Therefore, fuel no longer flows out from the relief passage 16.

この実施例によれば、鉄心７の歯形部４外周端面に各導
電コイル５による磁束が重なりあって複数個の磁極を発
生させ、円錐管状の接極子６とすることで、接極子６の
重量増分が少なく吸引力を大きくできる。さらに接極子
６が円錐形なので弁ストロークに対する歯形部４外周端
面と接極子６の内周面が形成する空隙変化が少なく、弁
ストロ第２図は本発明の更に他の実施例を示すもので、
第１図と異なる点は巻方向が同じ導電コイル５を角度方
向１個おきに歯形部４に装着したことである。これによ
って、導電コイル５の巻き作業を簡単にすることができ
る。According to this embodiment, the magnetic flux from each conductive coil 5 overlaps on the outer peripheral end surface of the toothed portion 4 of the iron core 7 to generate a plurality of magnetic poles, and the armature 6 is shaped like a conical tube. The suction power can be increased with small increments. Furthermore, since the armature 6 is conical, there is little change in the gap formed between the outer circumferential end surface of the tooth profile 4 and the inner circumferential surface of the armature 6 with respect to the valve stroke. ,
The difference from FIG. 1 is that conductive coils 5 having the same winding direction are attached to the toothed portions 4 at every other angle. This makes it possible to easily wind the conductive coil 5.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、接極子重量の増分を少なくし、吸引力
を大きくできるので弁の応答時間を短くすることができ
る。さらに弁ストロークによる吸引力変化が小さく、弁
ストロークが少し大きいものにも使用できる。According to the present invention, the increase in armature weight can be reduced and the suction force can be increased, so that the response time of the valve can be shortened. Furthermore, the change in suction force due to the valve stroke is small, so it can be used even with a slightly large valve stroke.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明による電磁弁の中心軸線による縦断面図
、第２図は第１図のＡ−ＡｔＦｒ而図、面３図は他の実
施例におけるＡ−Ａ断面図である。 １・・・弁ケーシング、２・・・案内部材、３・・・鉄
心、４・・・歯形部、５・・・導電コイル、６・・・接
極子、７・・・スプール弁、８・・・案内部、９・・・
案内穴、１０・・・中心孔、１１・・・弁本体、１２・
・・内孔、１３・・・本体、辷）４．、、よＩＥ’Ｍ−
１１ｓ−＊＊＊つ、１６−ａＬＭ路、（ｔ、） １７・・・閉鎖ばね。FIG. 1 is a vertical sectional view taken along the central axis of a solenoid valve according to the present invention, FIG. 2 is a cross-sectional view taken along the line A-AtFr in FIG. 1, and plane 3 is a sectional view taken along the line A-A of another embodiment. DESCRIPTION OF SYMBOLS 1... Valve casing, 2... Guide member, 3... Iron core, 4... Tooth section, 5... Conductive coil, 6... Armature, 7... Spool valve, 8... ...Information Department, 9...
Guide hole, 10... Center hole, 11... Valve body, 12.
...Inner hole, 13...Body, sleeve)4. ,,yo IE'M-
11s-***, 16-aLM path, (t,) 17...Closing spring.

Claims (3)

【特許請求の範囲】[Claims] １．鉄心と導電コイルと接極子とを有する電磁弁であつ
て、導電コイルが強磁性材料製の鉄心の上に装着されて
おり、接極子が弁体を保持している形式のものにおいて
、前記鉄心がすぐばかさ歯車形状で円錐形外周面に複数
個の角度的に隔てられている歯形部を有し、前記歯形部
に前記導電コイルを装着して各々の前記歯形部外周端面
が角度方向交互に異磁極になるようにし、前記鉄心の外
周部に配置した管状の接極子の内周面と前記歯形部外周
端面とが空隙を形して前記鉄心の軸方向に吸引力が働く
ことを特徴とする電磁弁。1. In a solenoid valve having an iron core, a conductive coil, and an armature, the conductive coil is mounted on an iron core made of a ferromagnetic material, and the armature holds a valve body. has a bevel gear shape and has a plurality of angularly spaced toothed portions on its conical outer peripheral surface, and the conductive coil is attached to the toothed portions so that the outer peripheral end surface of each of the toothed portions alternates in the angular direction. The magnetic poles are different from each other, and the inner circumferential surface of a tubular armature disposed on the outer circumference of the iron core and the outer circumferential end surface of the toothed part form a gap, so that an attractive force acts in the axial direction of the iron core. Solenoid valve. ２．前記歯形部に装着する前記導電コイルの巻方向が角
度方向交互に異なることを特徴とする特許請求の範囲１
項記載の電磁弁。2. Claim 1, characterized in that the winding directions of the conductive coils attached to the toothed portions are alternately different in angular direction.
Solenoid valve described in section. ３．巻方向が同じ前記導電コイルを角度方向１個おきに
前記歯形部に装着したことを特徴とする特許請求の範囲
１項記載の電磁弁。3. 2. The electromagnetic valve according to claim 1, wherein the conductive coils having the same winding direction are attached to the toothed portion in every other angular direction.