JP5884972B2 - DC electromagnet - Google Patents

DC electromagnet Download PDF

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JP5884972B2
JP5884972B2 JP2011258436A JP2011258436A JP5884972B2 JP 5884972 B2 JP5884972 B2 JP 5884972B2 JP 2011258436 A JP2011258436 A JP 2011258436A JP 2011258436 A JP2011258436 A JP 2011258436A JP 5884972 B2 JP5884972 B2 JP 5884972B2
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敏史 奥出
敏史 奥出
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Nachi Fujikoshi Corp
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Description

本発明は、産業機械等に使用される直流電磁石に関し、さらに詳細にはＤＣソレノイドにおける固定鉄心と可動鉄心の吸着端面形状の最適化と密着防止のために設ける非磁性スペーサを取付、固定を改良した直流電磁石に関する。 The present invention relates to a direct current electromagnet used for industrial machinery and the like, and more specifically, a nonmagnetic spacer provided for optimization and prevention of adhesion of a fixed iron core and a movable iron core in a DC solenoid is fixed and fixing is improved. The present invention relates to a direct current electromagnet.

直流電磁石は、通電時に可動鉄心と固定鉄心を直接吸着させると、通電を切った時に残留磁束のために可動鉄心が固定鉄心から離れにくくなる。この現象を防止するため、通常、非磁性体から成るスペーサを固定鉄心と可動鉄心との間に介在させる。また、スペーサの可動鉄心の移動方向の寸法（厚さ）が小さいほど、電磁石の発揮しうる吸引力を大きく出来ることから、可能な限り厚さを薄くしたい。そこで、従来この種の直流電磁石では、スペーサ３７（特許文献１に記載の符号を示す、以下同じ）の形状としてＣ字形形状と、馬蹄形スペーサ４８が記載されている（例えば、特許文献１。）。 When a DC electromagnet directly adsorbs a movable iron core and a fixed iron core when energized, the movable iron core is difficult to separate from the fixed iron core due to residual magnetic flux when energized. In order to prevent this phenomenon, a spacer made of a nonmagnetic material is usually interposed between the fixed iron core and the movable iron core. Also, the smaller the dimension (thickness) in the moving direction of the movable iron core of the spacer, the greater the attractive force that can be exerted by the electromagnet. Therefore, it is desirable to make the thickness as thin as possible. Therefore, in this type of direct current electromagnet, a C-shaped shape and a horseshoe-shaped spacer 48 are described as the shape of the spacer 37 (the reference numeral shown in Patent Document 1 is the same hereinafter) (for example, Patent Document 1). .

実公平５−２５２０３号公報No. 5-25203

特許文献１に記載されているスペーサの形状の場合、該スペーサを外方向に一旦押し広げた後、固定鉄心の溝に装着している。このため、スペーサの厚さが充分な場合、押し広げたときにスペーサに作用する応力は材料の弾性限度内に収まるので、スペーサの外径は押し広げる前の寸法に戻り、大きく拡大することはない。
しかしながら、スペーサの厚さを薄くしていくと、押し広げた際の応力が材料の弾性限度を超え塑性変形領域に達するため、スペーサの外径が大きく拡大した状態になって、スペーサの拡大した外径に他の部品が干渉し、次工程の組立作業の継続が不可能になってしまう恐れがあり、問題であった。
本発明は、係る課題を解決するためになされたもので直流電磁石における可動鉄心と固定鉄心との相互の端面形状の最適化と併せ、両鉄心の密着防止のために用いる非磁性スペーサとして、スペーサ内径側に意図的に変形しやすい部分を設け、電磁石の軸方向にも変形しうるようにしたスペーサを有する直流電磁石を提供することを目的とする。 In the case of the shape of the spacer described in Patent Document 1, the spacer is once expanded outwardly and then mounted in the groove of the fixed iron core. For this reason, if the spacer is thick enough, the stress acting on the spacer when it is expanded will be within the elastic limit of the material, so the outer diameter of the spacer will return to the size before expansion and greatly expand. Absent.
However, as the spacer thickness is reduced, the stress at the time of expansion exceeds the elastic limit of the material and reaches the plastic deformation region, so that the outer diameter of the spacer is greatly expanded and the spacer is expanded. Another part interfered with the outer diameter, and there was a possibility that the assembly work in the next process could not be continued , which was a problem.
The present invention has been made in order to solve the above problems, and as a non-magnetic spacer used for preventing the close contact between both cores in combination with optimization of the shape of the end surfaces of the movable iron core and fixed iron core in a DC electromagnet. An object of the present invention is to provide a DC electromagnet having a spacer which is provided with a part that is intentionally easily deformed on the inner diameter side and can be deformed in the axial direction of the electromagnet.

前記の課題を解決するため請求項１記載の本発明は、固定鉄心と、前記固定鉄心に向けて遠近移動できるようにした可動鉄心と、通電により前記可動鉄心を移動できるようにしたコイルとを有し、前記可動鉄心は当該側面に軸線方向に長く両端を開口する油路が形成されていると共に、筒状の中空管内に収容されており、
前記中空管の一方には前記固定鉄心が配置・固定され、前記固定鉄心には透孔が穿設されており、前記透孔には前記可動鉄心の作動によって被動せられるようにロッドが挿通されており、前記可動鉄心及び前記ロッドの作動時には前記透孔と前記ロッドとの間、前記固定鉄心と前記可動鉄心との間、及び前記油路を通して油の流通が行われるようにしてある直流電磁石において、前記可動鉄心は吸着端面の小径部がテーパ面を有する凹形状であり、前記固定鉄心は前記可動鉄心の凹形状と補合するように小径部がテーパ面を有する凸形状であって、前記固定鉄心の大径部と小径部の段部には溝部が設けられ、非磁性材料で形成されたＣ字形状のスペーサの内周側が前記溝部に嵌まり込まれており、前記スペーサは周面の一部を切欠開口部となした適宜幅のＣ字形状を有した本体と、前記適宜幅の略中央部に円周方向に沿って等間隔に円弧状の狭い溝を適宜長で形成し対向する位置に少なくとも２個設けた第１の溝と、前記第１の溝の一端から前記本体の中心に向けて形成され前記適宜幅の内方に導通する第２の溝と、前記第１及び第２の溝により形成された舌片部と、を備えたスペーサであって、かつ前記スペーサの内径は前記固定鉄心の小径部より小さく、前記スペーサの外径と前記中空管との間に相当の隙間を残すようにした直流電磁石とした。
また、請求項２に記載の発明は固定鉄心と、前記固定鉄心に向けて遠近移動できるようにした可動鉄心と、通電により前記可動鉄心を移動できるようにしたコイルとを有し、前記可動鉄心は当該側面に軸線方向に長く両端を開口する油路が形成されていると共に、筒状の中空管内に収容されており、
前記中空管の一方には前記固定鉄心が配置・固定され、前記固定鉄心には透孔が穿設されており、前記透孔には前記可動鉄心の作動によって被動せられるようにロッドが挿通されており、前記可動鉄心及び前記ロッドの作動時には前記透孔と前記ロッドとの間、前記固定鉄心と前記可動鉄心との間、及び前記油路を通して油の流通が行われるようにしてある直流電磁石において、
前記可動鉄心は吸着端面の小径部がテーパ面を有する凹形状であり、前記固定鉄心は前記可動鉄心の凹形状と補合するように小径部がテーパ面を有する凸形状であって、前記固定鉄心の大径部と小径部の段部には溝部が設けられ、非磁性材料で形成された円形状のスペーサの内周側が前記溝部に嵌まり込まれており、前記スペーサは円形状を有した本体と、前記適宜幅の略中央部に円周方向に沿って等間隔に円弧状の狭い溝を適宜長で形成し対向する位置に少なくとも２個設けた第１の溝と、前記第１の溝の一端から前記本体の中心に向けて形成され適宜幅の内方に導通する第２の溝と、前記第１及び第２の溝により形成された舌片部と、を備えたスペーサであって、かつ前記スペーサの内径は前記固定鉄心の小径部より小さく、前記スペーサの外径と前記中空管との間に相当の隙間を残すようにした直流電磁石とした。 In order to solve the above problems, the present invention according to claim 1 includes a fixed iron core, a movable iron core that can move toward and away from the fixed iron core, and a coil that can move the movable iron core by energization. And the movable iron core is accommodated in a cylindrical hollow tube with an oil passage that is long in the axial direction and is open at both ends on the side surface.
The fixed iron core is disposed and fixed to one of the hollow tubes, and a through hole is formed in the fixed core, and a rod is inserted into the through hole so as to be driven by the operation of the movable core. And when the movable iron core and the rod are operated, direct current flows between the through hole and the rod, between the fixed iron core and the movable iron core, and through the oil passage. In the electromagnet, the movable core has a concave shape in which the small diameter portion of the attracting end surface has a tapered surface, and the fixed core has a convex shape in which the small diameter portion has a tapered surface so as to complement the concave shape of the movable core. In addition, a groove portion is provided in the step portion of the large-diameter portion and the small-diameter portion of the fixed iron core, and an inner peripheral side of a C-shaped spacer formed of a nonmagnetic material is fitted into the groove portion. A part of the peripheral surface becomes a notch opening. A main body having a C-shape with an appropriate width, and an arc-shaped narrow groove at an equal interval along the circumferential direction in the substantially central portion of the appropriate width, and having at least two at opposite positions. A first groove, a second groove that is formed from one end of the first groove toward the center of the main body and that conducts inward in the appropriate width, and the first and second grooves. And a spacer having a tongue piece portion, and the inner diameter of the spacer is smaller than the small diameter portion of the fixed iron core, and a considerable gap is left between the outer diameter of the spacer and the hollow tube. A DC electromagnet was used.
The invention according to claim 2 includes a fixed iron core, a movable iron core that can move toward and away from the fixed iron core, and a coil that can move the movable iron core when energized, and the movable iron core. Is formed in the side surface with an oil passage that is long in the axial direction and opens at both ends, and is housed in a cylindrical hollow tube,
The fixed iron core is disposed and fixed to one of the hollow tubes, and a through hole is formed in the fixed core, and a rod is inserted into the through hole so as to be driven by the operation of the movable core. And when the movable iron core and the rod are operated, direct current flows between the through hole and the rod, between the fixed iron core and the movable iron core, and through the oil passage. In electromagnets,
The movable core has a concave shape in which the small diameter portion of the suction end surface has a tapered surface, and the fixed core has a convex shape in which the small diameter portion has a tapered surface so as to complement the concave shape of the movable core, Grooves are provided in the step portions of the large diameter portion and the small diameter portion of the iron core, and the inner peripheral side of a circular spacer formed of a nonmagnetic material is fitted into the groove portion, and the spacer has a circular shape. A first groove provided with at least two arcuate narrow grooves at equal intervals along the circumferential direction at an appropriate length and provided at opposite positions in the substantially central portion of the appropriate width, and the first A spacer having a second groove formed from one end of the groove toward the center of the main body and conducting inward in an appropriate width, and a tongue piece formed by the first and second grooves. And the inner diameter of the spacer is smaller than the small diameter portion of the fixed iron core, Of the outer diameter and the DC electromagnet to leave a substantial gap between the hollow tube.

本発明は直流電磁石における可動鉄心と固定鉄心との相互の端面形状を最適化と併せ、両鉄心の密着防止のために用いる非磁性スペーサとして、スペーサ内径側に意図的に変形しやすい部分を設け、電磁石の軸方向にも変形しうるようにしたスペーサを有する直流電磁石にすることができる。   The present invention is a non-magnetic spacer used for preventing the close contact of both iron cores with the optimization of the mutual end face shape of the movable iron core and the fixed iron core in the DC electromagnet. A DC electromagnet having a spacer that can be deformed also in the axial direction of the electromagnet can be obtained.

本発明の実施の形態に係る直流電磁石の略縦断面図である。1 is a schematic longitudinal sectional view of a DC electromagnet according to an embodiment of the present invention. 図１の部分拡大図である。It is the elements on larger scale of FIG. 図１のスペーサの拡大正面図である。It is an enlarged front view of the spacer of FIG. 第二の実施の形態に係るスペーサの拡大正面図である。It is an enlarged front view of the spacer which concerns on 2nd embodiment.

本発明の実施の形態に係る直流電磁石について図面により詳細に説明する。図１は直流電磁石の正面概略図を示し、弁装置１１において、参照符号１２はバルブボディを示し、内部には油路１３が形成されており、また油路１３には周知のように被制御装置に接続される図示しないＡ，Ｂポート、圧力ポート、タンクポートなどが連通されている。参照符号１４はスプールを示し、矢印方向に進退自在に備えられている。参照符号１５はリテーナ、参照符号１６はばね部材を示し、リテーナ１５を介してスプール１４を押圧するように構成されている。参照符号１７はバルブボディ１２の上に取付けられた端子箱、参照符号１８は端子箱１７内に設けられた端子金具、参照符号１９は接続金具を示し、後述するコイル５０のプラグピン５３を接続できるように構成されており、該接続金具１９には、外部から電源供給を受けるための図示しないリード線を接続できるようにされている。 A DC electromagnet according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a schematic front view of a DC electromagnet . In a valve device 11, reference numeral 12 denotes a valve body, an oil passage 13 is formed inside, and the oil passage 13 is controlled as is well known. A and B ports, pressure ports, tank ports and the like (not shown) connected to the apparatus are communicated. Reference numeral 14 denotes a spool, which is provided so as to freely advance and retract in the direction of the arrow. Reference numeral 15 denotes a retainer, and reference numeral 16 denotes a spring member, which is configured to press the spool 14 via the retainer 15. Reference numeral 17 denotes a terminal box mounted on the valve body 12, reference numeral 18 denotes a terminal fitting provided in the terminal box 17, reference numeral 19 denotes a connection fitting, and a plug pin 53 of a coil 50 to be described later can be connected. The connection fitting 19 can be connected to a lead wire (not shown) for receiving power supply from the outside.

参照符号３０は本発明の実施例の直流電磁石を示し、該直流電磁石３０は特許文献１（実公平５−２５２０３）と略同じ構造なので、主要な部品について符号を付して詳細な説明を省略する。図１において直流電磁石３０はガイドアッセンブリ３１の外周側に着脱自在に装着されたコイルアッセンブリ３２を含む。ガイドアッセンブリ３１には固定鉄心３３が形成され、バルブボディ１２に対してねじ部４８で着脱自在に螺合されている。参照符号３４は固定鉄心３３に穿設された透孔で、ロッド３５が挿通されている。参照符号３６は透孔３４とロッド３５との間に油の流通を可能に構成された流路（油路）を示す。 Reference numeral 30 denotes a DC electromagnet embodiment of the present invention, since the direct current electromagnet 30 and substantially the same structure as the patent document 1 (real equity 5-25203), omit detailed description by reference numeral the major components To do. In FIG. 1, a DC electromagnet 30 includes a coil assembly 32 that is detachably mounted on the outer peripheral side of a guide assembly 31. A fixed iron core 33 is formed in the guide assembly 31 and is detachably screwed to the valve body 12 by a threaded portion 48. Reference numeral 34 is a through hole formed in the fixed iron core 33, and the rod 35 is inserted therethrough. Reference numeral 36 denotes a flow path (oil path) configured to allow oil to flow between the through hole 34 and the rod 35.

図２において、固定鉄心３３の可動鉄心４５側の吸着端面３５´は大径部Φａ３７と小径部Φｂ３８を持つ凸形状に形成され、小径部Φｂ３８はさらにテーパ形状に加工され先端寸法径Φｃ３９が小径部Φｂ３８より小さくなるようになっている。また、大径部Φａ３７と小径部Φｂ３８の段部には、該小径部Φｂ３８より小さい溝４０が設けられており、溝径φｄは、φｂより小さくφｃより大きくなるように加工されている。参照符号４１は中空管で、非磁性リング４２と磁性体である端部材４３を溶接部６１で溶接して構成されており、さらに固定鉄心３３の溶接部６２で溶接・固定されている。参照符号４４は端部材４３に穿設された透孔４４´に挿入された手動操作用プッシュピンを示す。参照符号４５は中空管３１内に矢印方向に移動自在に内装された可動鉄心で、磁性材料で形成されている。 In FIG. 2, the suction end surface 35 ′ of the fixed iron core 33 on the movable iron core 45 side is formed in a convex shape having a large diameter portion Φa 37 and a small diameter portion Φb 38, and the small diameter portion Φb 38 is further processed into a tapered shape. It becomes smaller than the part Φb38. Further, the stepped portion of the large diameter portion Φa37 and the small diameter portion Faibi38, the small-diameter portion Faibi38 smaller grooves 40 are provided, the groove diameter phi d is processed to be larger than smaller than .phi.c .phi.b. Reference numeral 41 is a hollow tube, which is configured by welding a nonmagnetic ring 42 and an end member 43, which is a magnetic body, at a welded portion 61, and is welded and fixed at a welded portion 62 of the fixed iron core 33. Reference numeral 44 denotes a manually operated push pin inserted into a through hole 44 ′ formed in the end member 43. Reference numeral 45 is a movable iron core that is housed in the hollow tube 31 so as to be movable in the direction of the arrow, and is made of a magnetic material.

可動鉄心４５の固定鉄心側吸着面は凹形状に形成され、固定鉄心３３の凸部と接触しない程度の図２に示す隙間６３ができるように加工されている。参照符号４７は固定鉄心３３の溝４０に嵌り込むようにしたスペーサで、図３に示すように周面の一部を切欠開口部となした適宜幅のＣ字形状を有した本体４７ａと、前記適宜幅の略中央部に円周方向に沿って等間隔に円弧状の狭い溝を適宜長で形成し対向する位置に５個設けた第１の溝４７ｂと、前記第１の溝４７ｂの一端から前記本体４７ａの中心に向けて形成され適宜幅の内方に導通する第２の溝４７ｃと、前記第１及び第２の溝４７ｂ、４７ｃにより形成された舌片部４７ｄと、を備える。
図３に示すスペーサ４７において、本体４７ａに設けた第１の溝４７ｂ、第２の溝４７ｃ及び舌片部４７ｄの数は、実施例に限定されず少なくとも本体４７ａの円周方向に対向して少なくとも２個設ければよい。
ここで、スペーサ４７の内径Φｅは固定鉄心３３の小径部３８Φｂより小さく、先端径Φｃより大きく設計されており、固定鉄心３３の溝４０に嵌着し固定する構造になっている。なお、スペーサ４７は非磁性体材料（ステンレス、燐青銅など）で形成されており、外径は中空管４１との間に相当の隙間を残すようにされている。 The fixed iron core side adsorption surface of the movable iron core 45 is formed in a concave shape, and is processed so that a gap 63 shown in FIG. 2 is formed so as not to contact the convex portion of the fixed iron core 33. Reference numeral 47 is a spacer that fits into the groove 40 of the fixed iron core 33. As shown in FIG. 3, a main body 47a having a C-shape with an appropriate width having a part of the peripheral surface as a notch opening, A first groove 47b having five arcuate narrow grooves formed at appropriate intervals along the circumferential direction in the substantially central portion of the appropriate width and provided at five opposing positions, and the first groove 47b A second groove 47c formed from one end toward the center of the main body 47a and conducting inward in an appropriate width; and a tongue piece portion 47d formed by the first and second grooves 47b and 47c. .
In the spacer 47 shown in FIG. 3, the number of the first grooves 47b, the second grooves 47c, and the tongue pieces 47d provided in the main body 47a is not limited to the embodiment, and at least faces the circumferential direction of the main body 47a. It is sufficient to provide at least two.
Here, the inner diameter Φe of the spacer 47 is designed to be smaller than the small diameter portion 38 Φb of the fixed iron core 33 and larger than the tip diameter Φc, and is configured to be fitted and fixed in the groove 40 of the fixed iron core 33. The spacer 47 is made of a non-magnetic material (stainless steel, phosphor bronze, etc.), and has an outer diameter that leaves a considerable gap with the hollow tube 41.

参照符号３２はコイルアッセンブリを示すが、該コイルアッセンブリ３２は特許文献１（実公平５−２５２０３）と略同じ構造なので、主要な部品について符号を付して説明する。参照符号５１はケース、参照符号５０は内部にガイドアッセンブリ３１を挿入させ得るよう筒状に形成されたコイルを示す。参照符号５２はコイル５０の端部に配設したヨークを示し、前記ケース５１、前記ヨーク５２は磁性材料で構成されている。参照符号５３はプラグピンで、コイル５０のマグネットワイヤに接続されている。   Reference numeral 32 denotes a coil assembly. Since the coil assembly 32 has substantially the same structure as that of Patent Document 1 (Actual 5-25203), major parts will be described with reference numerals. Reference numeral 51 indicates a case, and reference numeral 50 indicates a coil formed in a cylindrical shape so that the guide assembly 31 can be inserted therein. Reference numeral 52 denotes a yoke disposed at the end of the coil 50. The case 51 and the yoke 52 are made of a magnetic material. Reference numeral 53 is a plug pin connected to the magnet wire of the coil 50.

本発明の実施の形態に係る直流電磁石３０は基本的に以上のように構成されているもので、次に動作について説明する。
端子金具１８が図示しない電源に接続されると、該接続金具１９、プラグピン５３を介してコイル５０に通電される。また、コイル５０の通電により可動鉄心４５は固定鉄心３３に吸着されスプール１４が切換る。
さらに、可動鉄心４５が固定鉄心３３に吸着された場合、固定鉄心３３と可動鉄心４５との間にスペーサ４７が介在するため、両鉄心３３、４５間に隙間６３によって形成され油流通用の油路４６が画成される。このため可動鉄心４５が移動して、それによってロッド３５が移動することによる油の流れ、すなわち弁装置１１における油路１３と中空管４１の内部における可動鉄心４５の端部材４３側の空間５７との間において油が油路３６及び油路４６を通して流れることが良好にして行われる。 The DC electromagnet 30 according to the embodiment of the present invention is basically configured as described above. Next, the operation will be described.
When the terminal fitting 18 is connected to a power source (not shown), the coil 50 is energized through the connection fitting 19 and the plug pin 53. Further, when the coil 50 is energized, the movable iron core 45 is attracted to the fixed iron core 33 and the spool 14 is switched.
Further, when the movable iron core 45 is adsorbed to the fixed iron core 33, the spacer 47 is interposed between the fixed iron core 33 and the movable iron core 45. A path 46 is defined. For this reason, the movable iron core 45 moves and thereby the oil flows due to the movement of the rod 35, that is, the space 57 on the end member 43 side of the movable iron core 45 inside the oil passage 13 and the hollow tube 41 in the valve device 11. The oil flows through the oil passage 36 and the oil passage 46 in between.

コイル５０の通電を断つと可動鉄心４５は開放される。すなわち図１に示す弁装置１１においてスプール１４が図示しない側にばね部材の弾発力によりロッド３５を介して可動鉄心４５を図１において左側へ移動させる。この場合、両鉄心３３、４５間のスペーサ４７が介在して隙間６３があるため、残留磁気や、プランジャ間への油の綴じ込みがなく、可動鉄心４５はすぐに開放されて移動する。すなわちこの場合油路１３と可動鉄心４５の左側の空間５７との間における油の流れも支障なく行われ可動鉄心４５は円滑に作動するようにされている。   When the energization of the coil 50 is cut off, the movable iron core 45 is opened. That is, in the valve device 11 shown in FIG. 1, the movable iron core 45 is moved to the left in FIG. 1 via the rod 35 by the elastic force of the spring member on the side where the spool 14 is not shown. In this case, since the spacer 47 is interposed between the iron cores 33 and 45 and there is a gap 63, there is no residual magnetism and no oil is bound between the plungers, and the movable iron core 45 is immediately opened and moved. That is, in this case, the flow of oil between the oil passage 13 and the space 57 on the left side of the movable iron core 45 is also performed without any trouble, so that the movable iron core 45 operates smoothly.

特にスペーサ４７は内径側に意図的に変形しやすいように適宜幅の略中央部に円周方向に沿って等間隔に円弧状の狭い溝を適宜長で形成し対向する位置に５個設けた第１の溝４７ｂと、前記第１の溝４７ｂの一端から前記本体４７ａの中心に向けて形成され適宜幅の内方に導通する第２の溝４７ｃと、第１及び第２の溝４７ｂ、４７ｃにより形成された舌片部４７ｄとを形成して変形しやすい部分を設け、電磁石の軸方向にも変形し得るようにした。このため、外方向への押し広げ量が小さくなり、材料の応力を低減し、スペーサ４７の外径の拡大を防止している。   In particular, the spacer 47 is formed with an arc-shaped narrow groove having an appropriate length at an equal interval along the circumferential direction in an approximately central portion of an appropriate width so as to be easily deformed intentionally toward the inner diameter side, and five spacers 47 are provided at opposing positions. A first groove 47b, a second groove 47c formed from one end of the first groove 47b toward the center of the main body 47a and conducting inward in an appropriate width, and first and second grooves 47b, The tongue piece portion 47d formed by 47c is formed to be easily deformable so that it can be deformed in the axial direction of the electromagnet. For this reason, the amount of outward expansion is reduced, the stress of the material is reduced, and the expansion of the outer diameter of the spacer 47 is prevented.

図４は図２のスペーサ４７の変形例であるスペーサ６７を示す。スペーサ６７は基本的には、スペーサ４７と同じ構成であって、スペーサ４７と同一構成要素には、同一符号を付して詳細な説明を省略する。
図４に示すスペーサ６７は、円形状をしているため、該スペーサ６７の外径拡大量をさらに低減させることできる。 FIG. 4 shows a spacer 67 which is a modification of the spacer 47 of FIG. The spacer 67 basically has the same configuration as the spacer 47, and the same components as those of the spacer 47 are denoted by the same reference numerals and detailed description thereof is omitted.
Since the spacer 67 shown in FIG. 4 has a circular shape, the outer diameter expansion amount of the spacer 67 can be further reduced.

１１ 弁装置
１２ バルブボディ １３、３６、４６ 油路
１４ スプール １５ リテーナ
１６ ばね部材 １７ 端子箱
３０ 直流電磁石 ３１ ガイドアッセンブリ
３２ コイルアッセンブリ ３３ 固定鉄心
３５ ロッド ４５ 可動鉄心
４７、６７ スペーサ DESCRIPTION OF SYMBOLS 11 Valve apparatus 12 Valve body 13 , 36, 46 Oil passage 14 Spool 15 Retainer 16 Spring member 17 Terminal box 30 DC electromagnet 31 Guide assembly 32 Coil assembly 33 Fixed iron core 35 Rod 45 Movable iron core 47, 67 Spacer

Claims (2)

固定鉄心と、前記固定鉄心に向けて遠近移動できるようにした可動鉄心と、通電により前記可動鉄心を移動できるようにしたコイルとを有し、前記可動鉄心は当該側面に軸線方向に長く両端を開口する油路が形成されていると共に、筒状の中空管内に収容されており、
前記中空管の一方には前記固定鉄心が配置・固定され、前記固定鉄心には透孔が穿設されており、前記透孔には前記可動鉄心の作動によって被動せられるようにロッドが挿通されており、前記可動鉄心及び前記ロッドの作動時には前記透孔と前記ロッドとの間、前記固定鉄心と前記可動鉄心との間、及び前記油路を通して油の流通が行われるようにしてある直流電磁石において、
前記可動鉄心は吸着端面の小径部がテーパ面を有する凹形状であり、前記固定鉄心は前記可動鉄心の凹形状と補合するように小径部がテーパ面を有する凸形状であって、
前記固定鉄心の大径部と小径部の段部には溝部が設けられ、
非磁性材料で形成されたＣ字形状のスペーサの内周側が前記溝部に嵌まり込まれており、
前記スペーサは周面の一部を切欠開口部となした適宜幅のＣ字形状を有した本体と、前記適宜幅の略中央部に円周方向に沿って等間隔に円弧状の狭い溝を適宜長で形成し対向する位置に少なくとも２個設けた第１の溝と、前記第１の溝の一端から前記本体の中心に向けて形成され前記適宜幅の内方に導通する第２の溝と、前記第１及び第２の溝により形成された舌片部と、を備えたスペーサであって、かつ前記スペーサの内径は前記固定鉄心の小径部より小さく、前記スペーサの外径と前記中空管との間に相当の隙間が残っていることを特徴とする直流電磁石。 A fixed iron core, a movable iron core that can move toward and away from the fixed iron core, and a coil that can move the movable iron core when energized, and the movable iron core has long ends in the axial direction on the side surface. An oil passage that is open is formed and accommodated in a cylindrical hollow tube,
The fixed iron core is disposed and fixed to one of the hollow tubes, and a through hole is formed in the fixed core, and a rod is inserted into the through hole so as to be driven by the operation of the movable core. And when the movable iron core and the rod are operated, direct current flows between the through hole and the rod, between the fixed iron core and the movable iron core, and through the oil passage. In electromagnets ,
The movable core has a concave shape in which the small diameter portion of the adsorption end surface has a tapered surface, and the fixed core has a convex shape in which the small diameter portion has a tapered surface so as to complement the concave shape of the movable core,
A groove portion is provided in the step portion of the large diameter portion and the small diameter portion of the fixed iron core,
The inner peripheral side of a C-shaped spacer formed of a nonmagnetic material is fitted into the groove,
The spacer has a C-shaped main body having an appropriate width with a part of the peripheral surface being a notch opening, and an arc-shaped narrow groove at equal intervals along the circumferential direction in the substantially central portion of the appropriate width. a first groove formed at least two the formed facing position appropriate length, the second groove conducting the inside of the first formed from one end of the groove to the center of the body the appropriate width And a tongue piece portion formed by the first and second grooves , and the inner diameter of the spacer is smaller than the smaller diameter portion of the fixed iron core, and the outer diameter of the spacer and the middle A direct current electromagnet characterized in that a considerable gap remains between the empty tube. 固定鉄心と、前記固定鉄心に向けて遠近移動できるようにした可動鉄心と、通電により前記可動鉄心を移動できるようにしたコイルとを有し、前記可動鉄心は当該側面に軸線方向に長く両端を開口する油路が形成されていると共に、筒状の中空管内に収容されており、
前記中空管の一方には前記固定鉄心が配置・固定され、前記固定鉄心には透孔が穿設されており、前記透孔には前記可動鉄心の作動によって被動せられるようにロッドが挿通されており、前記可動鉄心及び前記ロッドの作動時には前記透孔と前記ロッドとの間、前記固定鉄心と前記可動鉄心との間、及び前記油路を通して油の流通が行われるようにしてある直流電磁石において、
前記可動鉄心は吸着端面の小径部がテーパ面を有する凹形状であり、前記固定鉄心は前記可動鉄心の凹形状と補合するように小径部がテーパ面を有する凸形状であって、
前記固定鉄心の大径部と小径部の段部には溝部が設けられ、非磁性材料で形成された円形状のスペーサの内周側が前記溝部に嵌まり込まれており、
前記スペーサは円形状を有した本体と、前記適宜幅の略中央部に円周方向に沿って等間隔に円弧状の狭い溝を適宜長で形成し対向する位置に少なくとも２個設けた第１の溝と、前記第１の溝の一端から前記本体の中心に向けて形成され適宜幅の内方に導通する第２の溝と、前記第１及び第２の溝により形成された舌片部と、を備えたスペーサであって、かつ前記スペーサの内径は前記固定鉄心の小径部より小さく、前記スペーサの外径と前記中空管との間に相当の隙間が残っていることを特徴とする直流電磁石。 A fixed iron core, a movable iron core that can move toward and away from the fixed iron core, and a coil that can move the movable iron core when energized, and the movable iron core has long ends in the axial direction on the side surface. An oil passage that is open is formed and accommodated in a cylindrical hollow tube,
The fixed iron core is disposed and fixed to one of the hollow tubes, and a through hole is formed in the fixed core, and a rod is inserted into the through hole so as to be driven by the operation of the movable core. And when the movable iron core and the rod are operated, direct current flows between the through hole and the rod, between the fixed iron core and the movable iron core, and through the oil passage. In electromagnets,
The movable core has a concave shape in which the small diameter portion of the adsorption end surface has a tapered surface, and the fixed core has a convex shape in which the small diameter portion has a tapered surface so as to complement the concave shape of the movable core,
A groove portion is provided in the step portion of the large-diameter portion and the small-diameter portion of the fixed iron core, and the inner peripheral side of a circular spacer formed of a nonmagnetic material is fitted in the groove portion,
The spacer includes a circular main body, and a first circular arc-shaped narrow groove formed at an equal interval along the circumferential direction in a substantially central portion of the appropriate width and provided with at least two opposing positions. , A second groove that is formed from one end of the first groove toward the center of the main body and that conducts inward in an appropriate width, and a tongue piece formed by the first and second grooves And the inner diameter of the spacer is smaller than the small diameter portion of the fixed iron core, and a considerable gap remains between the outer diameter of the spacer and the hollow tube. Direct current electromagnet.
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