JP7214393B2 - solenoid valve - Google Patents

solenoid valve Download PDF

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JP7214393B2
JP7214393B2 JP2018151235A JP2018151235A JP7214393B2 JP 7214393 B2 JP7214393 B2 JP 7214393B2 JP 2018151235 A JP2018151235 A JP 2018151235A JP 2018151235 A JP2018151235 A JP 2018151235A JP 7214393 B2 JP7214393 B2 JP 7214393B2
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bobbin
hole
iron core
engaging portion
wall surface
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JP2020027842A (en
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宣尚 渡邊
義宜 小林
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株式会社ジェイテクトフルードパワーシステム
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Description

本発明は、コイルへの通電により可動鉄心を固定鉄心に吸引し、可動鉄心の移動により弁体を作動して流体を制御する電磁弁に関する。 The present invention relates to an electromagnetic valve that attracts a movable iron core to a fixed iron core by energizing a coil and operates a valve body by moving the movable iron core to control fluid.

この種の電磁弁は、コイルを巻回したボビンと、コイルと接続したリード線（端子部）とを被覆樹脂部材により被覆して一体形成している。固定鉄心（ステータ）は、コイルを巻回したボビンを環状孔（収容部）へ収容し、リード線（端子部）をターミナルと溶接で接続し、コネクタキャップを樹脂で成形する。このとき、被覆樹脂部材のコネクタ側をコネクタキャップと溶着して、ボビンをコネクタに一体的に固定している。また、被覆樹脂部材により被覆したボビンの軸方向一端面は、固定鉄心（ステータ）の吸引面と面一に配置している。 This type of solenoid valve is integrally formed by covering a bobbin around which a coil is wound and a lead wire (terminal portion) connected to the coil with a covering resin member. The fixed iron core (stator) accommodates a bobbin wound with a coil in an annular hole (accommodating portion), connects lead wires (terminal portions) to terminals by welding, and forms a connector cap with resin. At this time, the connector side of the covering resin member is welded to the connector cap to integrally fix the bobbin to the connector. One axial end surface of the bobbin covered with the covering resin member is flush with the suction surface of the fixed iron core (stator).

特開２００２－１１０４１９号公報Japanese Patent Application Laid-Open No. 2002-110419

ところが、かかる従来の電磁弁では、固定鉄心の吸引面と可動鉄心との間の隙間が微少であるため、可動鉄心の吸引時にこの隙間の圧力が大きく変動して作動抵抗が生じ、可動鉄心を固定鉄心へ滑らかに吸引することができないという問題点があった。 However, in such a conventional solenoid valve, since the gap between the attraction surface of the fixed core and the movable core is very small, the pressure in this gap fluctuates greatly when the movable core is attracted, and operating resistance is generated. There was a problem that it could not be smoothly attracted to the fixed iron core.

本発明の課題は、固定鉄心と可動鉄心との間の圧力変動を低減し得る電磁弁を提供するものである。 An object of the present invention is to provide an electromagnetic valve capable of reducing pressure fluctuations between a fixed core and a movable core.

かかる課題を達成すべく、本発明は次の手段をとった。即ち、
コイルへの通電非通電で弁体を作動して流体を制御する電磁弁において、コイルを巻回した略円筒形状のボビンと、ボビンを収容する略環状の環状孔を有する固定鉄心と、通電により固定鉄心に吸引される可動鉄心と、可動鉄心と連結する弁体とを備え、ボビンは固定鉄心の環状孔の壁面と対向する周面に第１係合部を有し、固定鉄心は環状孔の壁面に第１係合部と係合する第２係合部を有し、ボビンは、第１係合部を固定鉄心の第２係合部に係合することで、自身の軸方向の一端面を固定鉄心の可動鉄心を吸引する吸引面より軸方向内方に位置して固定し、固定鉄心の吸引面には、ボビンの軸方向の一端面と環状孔の内側の壁面および外側の壁面とで略環状の空間を窪み形成し、可動鉄心には略環状の空間に対向して一側面と軸方向反対側の他側面との間を貫通する貫通孔を配置し、貫通孔は可動鉄心の径方向で同一円周上に配置して位相を異にした複数の第１貫通孔と、第１貫通孔より径方向内方の同一円周上に配置して位相を異にした複数の第２貫通孔とから成し、第１貫通孔と第２貫通孔とを連通した。 In order to achieve this task, the present invention takes the following means. Namely
In a solenoid valve that controls a fluid by actuating a valve body by energizing or de-energizing a coil, a substantially cylindrical bobbin around which a coil is wound, a fixed iron core having a substantially annular hole that accommodates the bobbin, A movable iron core attracted to the fixed iron core and a valve body connected to the movable iron core are provided, the bobbin has a first engaging portion on a peripheral surface facing the wall surface of the annular hole of the fixed iron core, The bobbin has a second engaging portion that engages with the first engaging portion on the wall surface of the bobbin, and by engaging the first engaging portion with the second engaging portion of the fixed core, One end surface of the fixed iron core is positioned axially inward from the suction surface for attracting the movable iron core and is fixed. A substantially annular space is recessed with the wall surface, and a through hole is arranged in the movable iron core so as to penetrate between one side surface facing the substantially annular space and the other side surface on the opposite side in the axial direction, and the through hole is movable. A plurality of first through holes arranged on the same circumference in the radial direction of the iron core and having different phases, and a plurality of first through holes arranged on the same circumference radially inward from the first through holes and having different phases. and a second through hole, and the first through hole and the second through hole communicate with each other.

この場合、前記ボビンの前記内側の周面と前記環状孔の前記内側の壁面との間で、前記空間の近傍に略環状の第１密封部材を配置し、前記ボビンの外側の周面と前記環状孔の前記外側の壁面との間で、前記空間の近傍に略環状の第２密封部材を配置してもよい。また、前記第１密封部材は前記ボビンの前記内側の周面に窪み形成した略環状の第１凹部に収容し、前記第２密封部材は前記ボビンの前記外側の周面に窪み形成した略環状の第２凹部に収容してもよい。また、前記空間は前記環状孔の前記内側の壁面を前記吸引面へ向けて漸次縮径するテーパー状に形成すると共に、前記外側の壁面を前記吸引面へ向けて漸次拡径するテーパー状に形成してもよい。 In this case, a substantially annular first sealing member is arranged in the vicinity of the space between the inner peripheral surface of the bobbin and the inner wall surface of the annular hole, and the outer peripheral surface of the bobbin and the A substantially annular second sealing member may be disposed near the space between the outer wall surface of the annular hole. The first sealing member is accommodated in a substantially annular first recess formed in the inner peripheral surface of the bobbin, and the second sealing member is a substantially annular recess formed in the outer peripheral surface of the bobbin. may be accommodated in the second recess of. Further, the space is tapered such that the inner wall surface of the annular hole gradually decreases in diameter toward the suction surface, and the outer wall surface gradually increases in diameter toward the suction surface. You may

以上詳述したように、請求項１に記載の発明は、ボビンは固定鉄心の環状孔の壁面と対向する周面に第１係合部を有し、固定鉄心は環状孔の壁面に第１係合部と係合する第２係合部を有し、ボビンは、第１係合部を固定鉄心の第２係合部に係合することで、自身の軸方向の一端面を固定鉄心の可動鉄心を吸引する吸引面より軸方向内方に位置して固定し、固定鉄心の吸引面には、ボビンの軸方向の一端面と環状孔の内側の壁面および外側の壁面とで略環状の空間を窪み形成した。このため、固定鉄心と可動鉄心との間には、固定鉄心の吸引面と可動鉄心との間の隙間に加え、可動鉄心の吸引に影響されずに体積が常に一定の略環状の空間が形成されるから、略環状の空間を有さない従来弁に比し、可動鉄心の吸引時の固定鉄心と可動鉄心との間の体積変化率が小さくなり、固定鉄心と可動鉄心との間の圧力変動を低減することができる。また、第１係合部と第２係合部とを係合することで、ボビンの軸方向の位置を規制して固定するから、樹脂成形でボビンを固定鉄心に固定する従来弁に比し、ボビンの軸方向の一端面の軸方向位置を容易に設定可能で、固定鉄心の吸引面に所望の空間を簡単に形成することができる。また、可動鉄心には略環状の空間に対向して一側面と軸方向反対側の他側面との間を貫通する貫通孔を配置し、貫通孔は可動鉄心の径方向で同一円周上に配置して位相を異にした複数の第１貫通孔と、第１貫通孔より径方向内方の同一円周上に配置して位相を異にした複数の第２貫通孔とから成し、第１貫通孔と第２貫通孔とを連通した。このため、絞り開度が大きくなり流量が増加するから、固定鉄心と可動鉄心との間の圧力変動をより一層低減できる。 As described in detail above, in the invention according to claim 1, the bobbin has the first engaging portion on the peripheral surface facing the wall surface of the annular hole of the fixed iron core, and the fixed iron core has the first engaging portion on the wall surface of the annular hole. The bobbin has a second engaging portion that engages with the engaging portion, and by engaging the first engaging portion with the second engaging portion of the fixed core, the bobbin has one end face in the axial direction of the fixed core. The movable iron core is positioned axially inward from the suction surface that attracts the movable iron core, and the fixed iron core is fixed to the suction surface. The space of is recessed and formed. Therefore, between the fixed core and the movable core, in addition to the gap between the attraction surface of the fixed core and the movable core, a substantially annular space whose volume is always constant without being affected by the attraction of the movable core is formed. Therefore, compared to conventional valves that do not have a substantially annular space, the volume change rate between the fixed core and the movable core when the movable core is attracted is small, and the pressure between the fixed core and the movable core is reduced. Variation can be reduced. Further, by engaging the first engaging portion and the second engaging portion, the axial position of the bobbin is regulated and fixed. , the axial position of one axial end surface of the bobbin can be easily set, and a desired space can be easily formed on the suction surface of the fixed iron core. In addition, the movable iron core is provided with a through-hole that penetrates between one side surface and the other side surface on the axially opposite side facing the substantially annular space, and the through-holes are arranged on the same circumference in the radial direction of the movable iron core. comprising a plurality of first through holes arranged in different phases and a plurality of second through holes arranged in different phases on the same circumference radially inward from the first through holes, The first through-hole and the second through-hole are communicated with each other. As a result, the throttle opening increases and the flow rate increases, so that pressure fluctuations between the fixed core and the movable core can be further reduced.

また、請求項２に記載の発明は、ボビンの内側の周面と環状孔の内側の壁面との間で、空間の近傍に略環状の第１密封部材を配置し、ボビンの外側の周面と環状孔の外側の壁面との間で、空間の近傍に略環状の第２密封部材を配置した。このため、流体が流通する空間の近傍に第１密封部材及び第２密封部材を配置したから、ボビンの軸方向の一端面側から、ボビンの軸方向の一端面と対向する軸方向の他端面側への流体漏れを良好に防止することができる。 In the invention according to claim 2, a substantially annular first sealing member is arranged near the space between the inner peripheral surface of the bobbin and the inner wall surface of the annular hole, and the outer peripheral surface of the bobbin is A substantially annular second sealing member was disposed adjacent to the space between and the outer wall surface of the annular hole. For this reason, since the first sealing member and the second sealing member are arranged in the vicinity of the space through which the fluid flows, the other axial end face facing the one axial end face of the bobbin from the one axial end face side of the bobbin Fluid leakage to the side can be well prevented.

また、請求項３に記載の発明は、第１密封部材はボビンの内側の周面に窪み形成した略環状の第１凹部に収容し、第２密封部材はボビンの外側の周面に窪み形成した略環状の第２凹部に収容した。このため、固定鉄心に第１凹部および第２凹部を形成する場合に比し、磁路断面積を大きく設けることができるから、固定鉄心の吸引力を向上できる。 According to the third aspect of the invention, the first sealing member is accommodated in a substantially annular first recess formed in the inner peripheral surface of the bobbin, and the second sealing member is formed in the outer peripheral surface of the bobbin. It was accommodated in the substantially annular second concave portion. Therefore, compared to the case where the first recess and the second recess are formed in the fixed core, the cross-sectional area of the magnetic path can be increased, so that the attractive force of the fixed core can be improved.

また、請求項４に記載の発明は、空間は環状孔の内側の壁面を吸引面へ向けて漸次縮径するテーパー状に形成すると共に、外側の壁面を吸引面へ向けて漸次拡径するテーパー状に形成した。このため、環状孔の両側の壁面のテーパー形状が第１密封部材および第２密封部材の環状孔への挿通を案内するから、ボビンの環状孔への固定時に、第１密封部材および第２密封部材が環状孔の両側の壁面と吸引面との稜部に接触して損傷する恐れを低減できる。 Further, according to the fourth aspect of the invention, the space is tapered such that the inner wall surface of the annular hole gradually decreases in diameter toward the suction surface, and the outer wall surface gradually increases in diameter toward the suction surface. formed into a shape. Therefore, the tapered shape of the wall surfaces on both sides of the annular hole guides the insertion of the first sealing member and the second sealing member into the annular hole. It is possible to reduce the possibility that the member will be damaged by coming into contact with the ridge between the wall surfaces on both sides of the annular hole and the suction surface.

本発明の一実施形態を示した電磁弁の断面図である。1 is a cross-sectional view of an electromagnetic valve showing an embodiment of the present invention; FIG. 図１の要部拡大図である。FIG. 2 is an enlarged view of a main portion of FIG. 1; 図１とは異なる状態を示した要部拡大図である。FIG. 2 is an enlarged view of a main part showing a state different from FIG. 1; 図１の線Ａ－Ａに沿った断面図である。2 is a cross-sectional view along line AA of FIG. 1; FIG. 図１の線Ｂ－Ｂに沿った断面図である。2 is a cross-sectional view along line BB of FIG. 1; FIG. 図２のコイルの通電時を示した要部拡大図である。FIG. 3 is an enlarged view of a main portion showing the coil of FIG. 2 when energized;

以下、本発明の一実施形態を図面に基づき説明する。
図１および図２において、１は略円柱形状の固定鉄心で、弁本体２に螺着している。固定鉄心１は、軸方向一端側に後述する可動鉄心２１を吸引する吸引面１Ａを有すると共に、軸方向他端側に他側面１Ｂを有している。吸引面１Ａは、略環状の環状孔３を窪み形成し、環状孔３の径方向内方にばね収容孔４を窪み形成している。環状孔３は底面３Ａと内側の壁面３Ｂおよび外側の壁面３Ｃから構成している。他側面１Ｂは、コネクタ収容孔５を窪み形成している。固定鉄心１は、環状孔３の底面３Ａにコネクタ収容孔５へ連通する２つの挿通孔６（一つは図示せず）を貫通形成している。７は固定鉄心１に外嵌したＯリングで、固定鉄心１と弁本体２との間を液密的に密封している。 An embodiment of the present invention will be described below with reference to the drawings.
1 and 2, reference numeral 1 denotes a substantially cylindrical fixed iron core which is screwed to a valve body 2. As shown in FIG. The fixed core 1 has an attraction surface 1A for attracting a movable core 21, which will be described later, on one end in the axial direction, and has the other side surface 1B on the other end in the axial direction. The suction surface 1</b>A is recessed with a substantially annular annular hole 3 and recessed with a spring housing hole 4 radially inward of the annular hole 3 . The annular hole 3 is composed of a bottom surface 3A, an inner wall surface 3B and an outer wall surface 3C. The other side surface 1B has a recessed connector accommodating hole 5 formed therein. The stationary core 1 has two insertion holes 6 (one not shown) communicating with the connector housing hole 5 through the bottom surface 3A of the annular hole 3 . An O-ring 7 is externally fitted on the fixed core 1 to seal the gap between the fixed core 1 and the valve body 2 in a liquid-tight manner.

８はコイル９を巻回する略円筒形状のボビンで、弾性変形可能な樹脂材から形成し、軸方向中心に挿通孔１０を貫通形成している。挿通孔１０は、ボビン８の軸方向の一端面８Ａに第１開口端１０Ａを形成すると共に、他端面８Ｂに第２開口端１０Ｂを形成している。ボビン８は、他端面８Ｂに２つの凸部１１（１つは図示せず）を一体形成して突設している。凸部１１は軸方向中心に貫通孔１１Ａを貫通形成している。１２はリード線で、コイル９の図示しない巻き始め端または巻き終り端の一方と結線し、凸部１１の貫通孔１１Ａを挿通し、コネクタ１３を介して図示しない電源側に接続している。図示しないもう一方の凸部も凸部１１と同様に、軸方向中心に貫通孔を形成し、コイル９の巻き始め端または巻き終り端の他方と結線した図示しないリード線を貫通孔に挿通し、コネクタ１３を介して図示しない電源側に接続している。 Reference numeral 8 denotes a substantially cylindrical bobbin around which the coil 9 is wound. The insertion hole 10 forms a first open end 10A on one axial end surface 8A of the bobbin 8 and a second open end 10B on the other axial end surface 8B. The bobbin 8 has two protrusions 11 (one not shown) integrally formed on the other end surface 8B. A through hole 11A is formed through the convex portion 11 at the center in the axial direction. A lead wire 12 is connected to either the winding start end or the winding end end (not shown) of the coil 9, is inserted through the through hole 11A of the convex portion 11, and is connected to the power supply side (not shown) via a connector 13. Similarly to the convex portion 11, the other convex portion (not shown) has a through hole formed in the center in the axial direction, and a lead wire (not shown) connected to the other of the winding start end and the winding end end of the coil 9 is inserted through the through hole. , is connected to a power source (not shown) via a connector 13. FIG.

ボビン８は、挿通孔１０の内側の周面１４に、第１係合部１４Ａを略環状に窪み形成している。第１係合部１４Ａは、軸方向両端を漸次縮径するテーパー状に形成している。ボビン８の内側の周面１４には、第２開口端１０Ｂと第１係合部１４Ａとの間に当接部１４Ｂを形成している。当接部１４Ｂは、第２開口端１０Ｂから軸方向下方へテーパー状に漸次縮径したテーパー面と内側の周面１４との稜部である。 The bobbin 8 has a first engaging portion 14</b>A recessed in a substantially annular shape on the inner peripheral surface 14 of the insertion hole 10 . The first engaging portion 14A is formed in a tapered shape that gradually reduces in diameter at both ends in the axial direction. A contact portion 14B is formed on the inner peripheral surface 14 of the bobbin 8 between the second opening end 10B and the first engaging portion 14A. The contact portion 14B is a ridge between the inner peripheral surface 14 and a tapered surface whose diameter is gradually tapered downward in the axial direction from the second open end 10B.

ボビン８の内側の周面１４には、第１係合部１４Ａを形成した箇所より軸方向下方で、一端面８Ａの近傍に第１凹部１５Ａを略環状に窪み形成している。ボビン８の外側の周面１６には、第１凹部１５Ａと軸方向略同位置で、一端面８Ａの近傍に第２凹部１５Ｂを略環状に窪み形成している。１７Ａは第１凹部１５Ａに収容した第１密封部材としての第１Ｏリングで、環状孔３の内側の壁面３Ｂと当接して、ボビン８の内側の周面１４と環状孔３の内側の壁面３Ｂとの間を液密的に密封している。１７Ｂは第２凹部１５Ｂに収容した第２密封部材としての第２Ｏリングで、環状孔３の外側の壁面３Ｃと当接して、ボビン８の外側の周面１６と環状孔３の外側の壁面３Ｃとの間を液密的に密封している。 An inner peripheral surface 14 of the bobbin 8 has a first concave portion 15A formed in a substantially annular shape in the vicinity of the one end surface 8A below the portion where the first engaging portion 14A is formed in the axial direction. A second concave portion 15B is formed in a substantially annular shape in the vicinity of one end surface 8A of the outer peripheral surface 16 of the bobbin 8 at substantially the same axial position as the first concave portion 15A. Reference numeral 17A denotes a first O-ring as a first sealing member housed in the first recess 15A. is liquid-tightly sealed between A second O-ring 17B as a second sealing member accommodated in the second recess 15B contacts the outer wall surface 3C of the annular hole 3 to seal the outer peripheral surface 16 of the bobbin 8 and the outer wall surface 3C of the annular hole 3. is liquid-tightly sealed between

固定鉄心１は、環状孔３の内側の壁面３Ｂに第１係合部１４Ａと係合する第２係合部１８Ａを、内側の壁面３Ｂの径方向外方へ略環状に突出形成している。第２係合部１８Ａは、軸方向両端を漸次縮径するテーパー状に形成している。環状孔３の内側の壁面３Ｂは、第２係合部１８Ａと底面３Ａとの間にぬすみ部１８Ｂを略環状に窪み形成している。ぬすみ部１８Ｂは、ボビン８の内側の周面１４と間隙を有している。 In the fixed core 1, a second engaging portion 18A that engages with the first engaging portion 14A is formed on the inner wall surface 3B of the annular hole 3 and protrudes radially outward from the inner wall surface 3B in a substantially annular shape. . The second engaging portion 18A is formed in a tapered shape that gradually reduces in diameter at both ends in the axial direction. The inner wall surface 3B of the annular hole 3 has a substantially annular hollow portion 18B formed between the second engaging portion 18A and the bottom surface 3A. The relief portion 18B has a gap with the inner peripheral surface 14 of the bobbin 8. As shown in FIG.

ボビン８は、２つの凸部１１（１つは図示せず）を固定鉄心１の挿通孔６（１つは図示せず）にそれぞれ挿通して径方向位置を規制し、第１係合部１４Ａと第２係合部１８Ａを係合して軸方向位置を規制し、固定鉄心１に位置決め固定している。 The bobbin 8 has two protrusions 11 (one not shown) inserted into the insertion holes 6 (one not shown) of the fixed iron core 1 respectively to regulate the radial position, and the first engaging portion 14A and the second engaging portion 18A are engaged with each other to regulate the axial position, and are positioned and fixed to the fixed core 1 .

図３において、ボビン８を固定鉄心１に固定する順序は次のとおりである。
（１）第１Ｏリング１７Ａおよび第２Ｏリング１７Ｂを装着したボビン８を凸部１１側から固定鉄心１の環状孔３へ挿通し、２つの凸部１１（１つは図示せず）を固定鉄心１の挿通孔６（１つは図示せず）にそれぞれ挿通して径方向位置を規制する。
（２）ボビン８を軸方向上方へ移動し、ボビン８の当接部１４Ｂが第２係合部１８Ａの下端に当接する。
（３）さらにボビン８を軸方向上方へ押圧すると、ボビン８が径方向外方へ弾性変形しながら軸方向上方へ移動する。
（４）第１係合部１４Ａの上端と第２係合部１８Ａの上端とが当接して第１係合部１４Ａと第２係合部１８Ａが係合すると共に、ボビン８の他端面８Ｂと環状孔３の底面３Ａとが当接して、軸方向位置を規制し、図２に示す如く、ボビン８を固定鉄心１に固定する。
このとき、２つの凸部１１（１つは図示せず）を挿通孔６（１つは図示せず）にそれぞれ挿通してから第１係合部１４Ａと第２係合部１８Ａが係合するように、ボビン８の当接部１４Ｂが第２係合部１８Ａの下端に当接する当接開始位置ａから凸部１１（１つは図示せず）の軸方向端面１１Ｂ（１つは図示せず）までの軸方向長さ寸法Ａを、当接開始位置ａから環状孔３の底面３Ａまでの軸方向長さ寸法Ｂよりも大きく設定している。また、ボビン８の一端面８Ａは、固定鉄心１の吸引面１Ａよりも軸方向内方に位置して固定している。 In FIG. 3, the order of fixing the bobbin 8 to the fixed core 1 is as follows.
(1) The bobbin 8 with the first O-ring 17A and the second O-ring 17B is inserted into the annular hole 3 of the fixed core 1 from the projection 11 side, and the two projections 11 (one is not shown) are inserted into the fixed core. 1 through holes 6 (one of which is not shown) to regulate the radial position.
(2) The bobbin 8 is moved upward in the axial direction, and the contact portion 14B of the bobbin 8 contacts the lower end of the second engaging portion 18A.
(3) When the bobbin 8 is further pushed upward in the axial direction, the bobbin 8 moves upward in the axial direction while being elastically deformed radially outward.
(4) The upper end of the first engaging portion 14A and the upper end of the second engaging portion 18A abut against each other to engage the first engaging portion 14A and the second engaging portion 18A, and the other end surface 8B of the bobbin 8. and the bottom surface 3A of the annular hole 3 abut to regulate the axial position and fix the bobbin 8 to the fixed core 1 as shown in FIG.
At this time, the two protrusions 11 (one is not shown) are inserted into the insertion holes 6 (one is not shown), and then the first engaging portion 14A and the second engaging portion 18A are engaged. , from the contact start position a where the contact portion 14B of the bobbin 8 contacts the lower end of the second engaging portion 18A to the axial end face 11B (one is not shown) of the projection 11 (one is not shown). not shown) is set larger than the axial length dimension B from the contact start position a to the bottom surface 3A of the annular hole 3. One end surface 8A of the bobbin 8 is positioned axially inward of the attraction surface 1A of the fixed core 1 and fixed.

図２および図４において、１９はボビン８の一端面８Ａの軸方向下方に形成した空間で、固定鉄心１の吸引面１Ａに、ボビン８の一端面８Ａと環状孔３の内側の壁面３Ｂおよび外側の壁面３Ｃで略環状に窪み形成している。環状孔３の内側の壁面３Ｂの端部は、吸引面１Ａに向けて漸次縮径するテーパー状のテーパー面２０Ａを形成している。環状孔３の外側の壁面３Ｃの端部は、吸引面１Ａに向けて漸次拡径するテーパー状のテーパー面２０Ｂを形成している。 2 and 4, reference numeral 19 denotes a space formed axially below the one end surface 8A of the bobbin 8. The suction surface 1A of the fixed core 1 is provided with the one end surface 8A of the bobbin 8, the inner wall surface 3B of the annular hole 3 and the The outer wall surface 3C is recessed in a substantially annular shape. The end portion of the inner wall surface 3B of the annular hole 3 forms a tapered surface 20A whose diameter gradually decreases toward the suction surface 1A. The end portion of the outer wall surface 3C of the annular hole 3 forms a tapered surface 20B whose diameter gradually increases toward the suction surface 1A.

コネクタ１３は、２つのリード線１２（１つは図示しない）と接続した基部を固定鉄心１のコネクタ収容孔５へ収容し、複数のボルト部材１３Ａで固定鉄心１に固定している。 The connector 13 has its base connected to two lead wires 12 (one not shown) housed in the connector housing hole 5 of the fixed core 1 and fixed to the fixed core 1 with a plurality of bolt members 13A.

２１は略円盤状の可動鉄心で、固定鉄心１の吸引面１Ａと対向して配置され、コイル９への通電で固定鉄心１に吸引する。可動鉄心２１は、固定鉄心１と対向する一側面２１Ａと、一側面２１Ａと軸方向反対側で対向する他側面２１Ｂを有する。図５において、２２Ａは可動鉄心２１に形成した４つの第１貫通孔で、可動鉄心２１の径方向で同一円周上に９０℃ずつ位相を異にして配置すると共に、固定鉄心１の空間１９と対向して配置している。２２Ｂは第１貫通孔２２Ａより小径の８つの第２貫通孔で、第１貫通孔２２Ａより径方向内方の同一円周上に４５℃ずつ位相を異にして配置すると共に、固定鉄心１の空間１９と対向して配置している。２２Ｃは可動鉄心２１の一側面２１Ａに窪み形成した４つの連通溝で、４つの第１貫通孔２２Ａと、第１貫通孔２２Ａと径方向略同一位置にある４つの第２貫通孔２２Ｂとを連通し、可動鉄心２１の外周面２１Ｃに開口している。第１貫通孔２２Ａと第２貫通孔２２Ｂおよび連通溝２２Ｃは、可動鉄心２１の一側面２１Ａ側と他側面２１Ｂのドレンを流通する。 Reference numeral 21 denotes a substantially disk-shaped movable iron core, which is arranged to face the attraction surface 1A of the fixed iron core 1, and is attracted to the fixed iron core 1 when the coil 9 is energized. Movable iron core 21 has one side surface 21A facing fixed iron core 1 and another side surface 21B facing axially opposite side surface 21A. In FIG. 5, 22A denotes four first through holes formed in the movable core 21, which are arranged on the same circumference in the radial direction of the movable core 21 with different phases of 90° C., and the space 19 of the fixed core 1 are placed facing each other. Eight second through holes 22B having a diameter smaller than that of the first through hole 22A are arranged radially inward of the first through hole 22A on the same circumference with a phase difference of 45°C. It is arranged facing the space 19 . Reference numeral 22C designates four communication grooves recessed in one side surface 21A of the movable iron core 21. The four first through holes 22A and the four second through holes 22B located at approximately the same position in the radial direction as the first through holes 22A. It communicates and opens to the outer peripheral surface 21</b>C of the movable core 21 . The first through hole 22A, the second through hole 22B, and the communication groove 22C allow the drains of the one side surface 21A side and the other side surface 21B of the movable iron core 21 to flow.

２３は略リング状の調整部材で、固定鉄心１の吸引面１Ａと弁本体２との間に介装し、可動鉄心２１のストローク量を調整する。２４はスプール状の弁体で、ボルト部材２５で可動鉄心２１に連結し、軸方向へ摺動する。弁体２４およびボルト部材２５は、ドレンを流通する貫通孔２４Ａ、２５Ａをそれぞれ軸方向中心に貫通形成し、貫通孔２４Ａと貫通孔２５Ａとは連通している。２６は略円筒形状のスリーブ部材で、軸方向中心に貫通形成した挿通孔２６Ａに弁体２４を挿通し、弁本体２に螺合した固定部材２７で弁本体２に固定している。２７Ａは固定部材２７に形成した貫通孔で、固定部材２７の径方向へ複数配置し、ドレンを流通する。２８は固定鉄心１のばね収容孔４に収容したばね部材で、ばね収容孔４の底部と可動鉄心２１の一側面２１Ａとの間に介装し、弁体２４を軸方向下方に付勢する。２９は弁本体２に形成した弁座で、弁体２４が着座して流体の供給流路３０と排出流路３１との間を遮断し、弁体２４が離脱して供給流路３０と排出流路３１との間を連通する。 A substantially ring-shaped adjusting member 23 is interposed between the suction surface 1A of the fixed iron core 1 and the valve body 2 to adjust the stroke amount of the movable iron core 21 . A spool-shaped valve body 24 is connected to the movable iron core 21 by a bolt member 25 and slides in the axial direction. The valve body 24 and the bolt member 25 have through holes 24A and 25A through which the drain flows, respectively, at the center in the axial direction. Reference numeral 26 denotes a substantially cylindrical sleeve member, through which the valve body 24 is inserted through an insertion hole 26A which is axially centered and is fixed to the valve body 2 by a fixing member 27 screwed to the valve body 2 . A plurality of through holes 27A are formed in the fixing member 27 and are arranged in the radial direction of the fixing member 27 to allow drain to flow. Reference numeral 28 denotes a spring member accommodated in the spring accommodation hole 4 of the fixed iron core 1. It is interposed between the bottom of the spring accommodation hole 4 and one side surface 21A of the movable iron core 21, and urges the valve body 24 downward in the axial direction. . Reference numeral 29 denotes a valve seat formed in the valve body 2. The valve body 24 is seated to cut off the fluid between the supply channel 30 and the discharge channel 31, and the valve body 24 is separated to disconnect the supply channel 30 and the discharge channel. It communicates with the channel 31 .

供給流路３０から弁体２４と弁本体２の摺動隙間をつたって弁体２４の一端側に滞留したドレンは、弁体２４の貫通孔２４Ａ、ボルト部材２５の貫通孔２５Ａ、可動鉄心２１の第１貫通孔２２Ａ、第２貫通孔２２Ｂ、固定部材２７の貫通孔２７Ａ、スリーブ部材２６と弁本体２の隙間を介して排出流路３１へと排出される。 The drain that has accumulated on one end side of the valve body 24 through the sliding gap between the valve body 24 and the valve main body 2 from the supply flow path 30 flows through the through hole 24A of the valve body 24, the through hole 25A of the bolt member 25, and the movable iron core 21. , the first through hole 22A, the second through hole 22B, the through hole 27A of the fixing member 27, and the gap between the sleeve member 26 and the valve body 2, and are discharged to the discharge passage 31.

次に、かかる構成の作動を説明する。
図１および図２は、コイル９の非通電状態を示し、弁体２４はばね部材２８で付勢されて弁本体２の弁座２９に着座し、供給流路３０と排出流路３１との間を遮断している。 Next, the operation of such a configuration will be described.
1 and 2 show the non-energized state of the coil 9, the valve body 24 is seated on the valve seat 29 of the valve body 2 by being biased by the spring member 28, and the supply channel 30 and the discharge channel 31 are connected. blocking the space.

この状態で、コイル９を通電すると、図６に示す如く、可動鉄心２１が固定鉄心１に吸引される。そして、弁体２４はこの吸引力で弁体２４に作用するばね部材２８のばね力に抗して軸方向上方に移動し、弁座２９から離脱して供給流路３０と排出流路３１との間を連通する。このとき、固定鉄心１の空間１９の体積は、図２に示すコイル９の非通電時の空間１９と同一である。 When the coil 9 is energized in this state, the movable core 21 is attracted to the fixed core 1 as shown in FIG. By this suction force, the valve body 24 moves upward in the axial direction against the spring force of the spring member 28 acting on the valve body 24, and is separated from the valve seat 29 to form the supply channel 30 and the discharge channel 31. communicate between At this time, the volume of the space 19 of the fixed core 1 is the same as that of the space 19 when the coil 9 is not energized as shown in FIG.

この状態で、コイル９を非通電にすると、弁体２４はばね部材２８のばね力で軸方向下方へ付勢され弁座２９に着座し、供給流路３０と排出流路３１との間を遮断する。 In this state, when the coil 9 is de-energized, the valve body 24 is urged downward in the axial direction by the spring force of the spring member 28 and is seated on the valve seat 29, thereby separating the supply channel 30 and the discharge channel 31. Cut off.

かかる作動において、ボビン８は固定鉄心１の環状孔３の内側の壁面３Ｂと対向する内側の周面１４に第１係合部１４Ａを有し、固定鉄心１は環状孔３の内側の壁面３Ｂに第１係合部１４Ａと係合する第２係合部１８Ａを有し、ボビン８は、第１係合部１４Ａを固定鉄心１の第２係合部１８Ａに係合することで、自身の軸方向の一端面８Ａを固定鉄心１の可動鉄心２１を吸引する吸引面１Ａより軸方向内方に位置して固定し、固定鉄心１の吸引面１Ａには、ボビン８の軸方向の一端面８Ａと環状孔３の内側の壁面３Ｂおよび外側の壁面３Ｃとで略環状の空間１９を窪み形成した。このため、固定鉄心１と可動鉄心２１との間には、固定鉄心１の吸引面１Ａと可動鉄心２１との間の隙間に加え、可動鉄心２１の吸引に影響されずに体積が常に一定の略環状の空間１９が形成されるから、略環状の空間１９を有さない従来弁に比し、可動鉄心２１の吸引時の固定鉄心１と可動鉄心２１との間の体積変化率が小さくなり、固定鉄心１と可動鉄心２１との間の圧力変動を低減することができる。また、第１係合部１４Ａと第２係合部１８Ａとを係合することで、ボビン８の軸方向の位置を規制して固定するから、樹脂成形でボビン８を固定鉄心１に固定する従来弁に比し、ボビン８の軸方向の一端面８Ａの軸方向位置を容易に設定可能で、固定鉄心１の吸引面１Ａに所望の空間１９を簡単に形成することができる。 In such an operation, the bobbin 8 has the first engaging portion 14A on the inner peripheral surface 14 facing the inner wall surface 3B of the annular hole 3 of the fixed core 1, and the fixed core 1 touches the inner wall surface 3B of the annular hole 3. has a second engaging portion 18A that engages with the first engaging portion 14A, and the bobbin 8 engages the first engaging portion 14A with the second engaging portion 18A of the fixed core 1, thereby One axial end surface 8A of the bobbin 8 is positioned axially inward from the attraction surface 1A for attracting the movable iron core 21 of the fixed iron core 1 and fixed. A substantially annular space 19 is recessed by the end face 8A and the inner wall surface 3B and the outer wall surface 3C of the annular hole 3 . Therefore, between the fixed core 1 and the movable core 21, in addition to the gap between the attraction surface 1A of the fixed core 1 and the movable core 21, the volume is always constant without being affected by the attraction of the movable core 21. Since the substantially annular space 19 is formed, the volume change rate between the fixed iron core 1 and the movable iron core 21 when the movable iron core 21 is attracted becomes smaller compared to the conventional valve that does not have the substantially annular space 19 . , the pressure fluctuation between the fixed core 1 and the movable core 21 can be reduced. Further, by engaging the first engaging portion 14A and the second engaging portion 18A, the axial position of the bobbin 8 is regulated and fixed, so the bobbin 8 is fixed to the fixed core 1 by resin molding. Compared with the conventional valve, the axial position of the one end surface 8A of the bobbin 8 can be easily set, and the desired space 19 can be easily formed on the suction surface 1A of the fixed iron core 1.

また、ボビン８の内側の周面１４と環状孔３の内側の壁面３Ｂとの間で、空間１９の近傍に略環状の第１Ｏリング１７Ａを配置し、ボビン８の外側の周面１６と環状孔３の外側の壁面３Ｃとの間で、空間１９の近傍に略環状の第２Ｏリング１７Ｂを配置した。このため、流体が流通する空間１９の近傍に第１Ｏリング１７Ａ及び第２Ｏリング１７Ｂを配置したから、ボビン８の軸方向の一端面８Ａ側から、ボビン８の軸方向の一端面８Ａと対向する軸方向の他端面８Ｂ側への流体漏れを良好に防止することができる。 In addition, a substantially annular first O-ring 17A is arranged near the space 19 between the inner peripheral surface 14 of the bobbin 8 and the inner wall surface 3B of the annular hole 3, and the outer peripheral surface 16 of the bobbin 8 and the annular first O-ring 17A are arranged. A substantially annular second O-ring 17B is arranged in the vicinity of the space 19 between the hole 3 and the outer wall surface 3C. Therefore, since the first O-ring 17A and the second O-ring 17B are arranged in the vicinity of the space 19 through which the fluid flows, the one axial end surface 8A of the bobbin 8 faces the one axial end surface 8A of the bobbin 8. It is possible to satisfactorily prevent fluid leakage toward the other end surface 8B in the axial direction.

また、第１Ｏリング１７Ａはボビン８の内側の周面１４に窪み形成した略環状の第１凹部１５Ａに収容し、第２Ｏリング１７Ｂはボビン８の外側の周面１６に窪み形成した略環状の第２凹部１５Ｂに収容した。このため、固定鉄心１に第１凹部１５Ａおよび第２凹部１５Ｂを形成する場合に比し、磁路断面積を大きく設けることができるから、固定鉄心１の吸引力を向上できる。 The first O-ring 17A is housed in a substantially annular first recess 15A recessed in the inner peripheral surface 14 of the bobbin 8, and the second O-ring 17B is recessed in the outer peripheral surface 16 of the bobbin 8. It was accommodated in the second concave portion 15B. Therefore, compared to the case where the first recessed portion 15A and the second recessed portion 15B are formed in the fixed core 1, the magnetic path cross-sectional area can be provided larger, so that the attractive force of the fixed core 1 can be improved.

また、空間１９は環状孔３の内側の壁面３Ｂの端部を吸引面１Ａへ向けて漸次縮径するテーパー状のテーパー面２０Ａとする共に、外側の壁面３Ｃの端部を吸引面１Ａへ向けて漸次拡径するテーパー状のテーパー面２０Ｂとした。このため、環状孔３の両側の壁面３Ｂ、３Ｃのテーパー面２０Ａ、２０Ｂが第１Ｏリング１７Ａおよび第２Ｏリング１７Ｂの環状孔３への挿通を案内するから、ボビン８の環状孔３への固定時に、第１Ｏリング１７Ａおよび第２Ｏリング１７Ｂが環状孔３の両側の壁面３Ｂ、３Ｃと吸引面１Ａとの稜部に接触して損傷する恐れを低減できる。 The space 19 has a tapered surface 20A whose diameter gradually decreases toward the suction surface 1A at the end of the inner wall surface 3B of the annular hole 3, and the end of the outer wall surface 3C toward the suction surface 1A. A tapered surface 20B having a tapered shape that gradually expands in diameter is formed. Therefore, since the tapered surfaces 20A, 20B of the wall surfaces 3B, 3C on both sides of the annular hole 3 guide the insertion of the first O-ring 17A and the second O-ring 17B into the annular hole 3, the bobbin 8 is fixed to the annular hole 3. It is possible to reduce the possibility that the first O-ring 17A and the second O-ring 17B are sometimes damaged by coming into contact with the ridge between the wall surfaces 3B and 3C on both sides of the annular hole 3 and the suction surface 1A.

また、第１係合部１４Ａの軸方向両端と第２係合部１８Ａの軸方向両端はそれぞれ漸次縮径してテーパー状に形成した。このため、テーパー状の各両端部で第１係合部１４Ａと第２係合部１８Ａとの係合を案内するから、滑らかにボビン８を固定鉄心１へ固定することができる。また、環状孔３の内側の壁面３Ｂは、第２係合部１８Ａと底面３Ａとの間にぬすみ部１８Ｂを略環状に窪み形成し、ボビン８の内側の周面１４と間隙を有した。このため、第１係合部１４Ａと第２係合部１８Ａとが係合する際に、当接部１８Ｂと第１係合部１４Ａとの間の内側の周面１４は、環状孔３の内側の壁面３Ｂと当接しないから、第１係合部１４Ａと第２係合部１８Ａとを確実に係合することができる。また、可動鉄心２１の第１貫通孔２２Ａと第２貫通孔２２Ｂは、固定鉄心１の空間１９に対向して配置した。このため、可動鉄心２１のストローク量が僅少で固定鉄心１に空間１９を有さず、第１貫通孔２２Ａおよび第２貫通孔２２Ｂの開口端と吸引面１Ａとの間で絞りが形成される従来弁に比し、ドレンは第１貫通孔２２Ａおよび第２貫通孔２２Ｂの開口面積で絞られるため、絞り開度が大きくなり流量が増加するから、固定鉄心１と可動鉄心２１との間の圧力変動をより一層低減できる。さらに、第１貫通孔２２Ａと第２貫通孔２２Ｂは磁路を形成しない空間１９に対向して配置しているから、固定鉄心１の吸引力の低下を抑制することができる。 Both ends of the first engaging portion 14A in the axial direction and both ends of the second engaging portion 18A in the axial direction are gradually reduced in diameter to form a tapered shape. Therefore, the tapered end portions guide the engagement between the first engaging portion 14A and the second engaging portion 18A, so that the bobbin 8 can be smoothly fixed to the fixed core 1 . The inner wall surface 3B of the annular hole 3 has a hollow portion 18B formed between the second engaging portion 18A and the bottom surface 3A in a substantially annular shape, and has a gap with the inner peripheral surface 14 of the bobbin 8. Therefore, when the first engaging portion 14A and the second engaging portion 18A are engaged with each other, the inner circumferential surface 14 between the contact portion 18B and the first engaging portion 14A is the same as that of the annular hole 3. Since there is no contact with the inner wall surface 3B, the first engaging portion 14A and the second engaging portion 18A can be reliably engaged. Also, the first through hole 22A and the second through hole 22B of the movable core 21 are arranged to face the space 19 of the fixed core 1 . Therefore, the stroke amount of the movable iron core 21 is very small, the fixed iron core 1 does not have the space 19, and a throttle is formed between the opening ends of the first through hole 22A and the second through hole 22B and the suction surface 1A. Compared to the conventional valve, the drain is throttled by the opening area of the first through-hole 22A and the second through-hole 22B, so the throttle opening increases and the flow rate increases. Pressure fluctuations can be further reduced. Furthermore, since the first through-hole 22A and the second through-hole 22B are arranged to face the space 19 that does not form a magnetic path, it is possible to suppress a decrease in the attractive force of the fixed core 1 .

なお、前述の一実施形態では、リード線１２（１つは図示せず）を挿通したボビン８の凸部１１（１つは図示せず）を固定鉄心１の挿通孔６（１つは図示せず）へ挿通して、固定鉄心１のコネクタ収容孔５に収容したコネクタ１３とリード線１２（１つは図示せず）とを接続したが、リード線１２（１つは図示せず）をボビン８の他端面８Ｂの凸部１１（１つは図示せず）を突設形成した箇所とは異なる位置から導出し、固定鉄心１の挿通孔６（１つは図示せず）とは別に設けた挿通孔からコネクタ収容孔５側へ挿通してコネクタ１３と接続してもよい。また、当接部１８Ｂは第２開口端１０Ｂから軸方向下方へテーパー状に漸次縮径したテーパー面と内側の周面１４との稜部としたが、テーパー面を形成しないで、第２開口端１０Ｂを当接部としてもよい。また、第１係合部１４Ａの軸方向両端と第２係合部１８Ａの軸方向両端はそれぞれ漸次縮径してテーパー状に形成したが、矩形状に形成したり、第１係合部１４Ａを球面状に窪み形成し、第２係合部１８Ａを球面状に突出形成したりしてもよい。また、ボビン８の凸部１１（１つは図示せず）はボビン８の他端面８Ｂに一体形成したが、鋼管や硬質チューブ等の円筒部材をボビン８の他端面８Ｂに接合して凸部１１（１つは図示せず）を形成してもよい。また、第１凹部１５Ａおよび第２凹部１５Ｂはボビン８の両側の周面１４、１６にそれぞれ形成したが、固定鉄心１の両側の壁面３Ｂ、３Ｃに形成して、第１Ｏリング１７Ａおよび第２Ｏリング１７Ｂを収容してもよい。また、環状孔３の両側の壁面３Ｂ、３Ｃの端部は、テーパー状のテーパー面２０Ａ、２０Ｂを形成したが、吸引面１Ａと略直交する稜部としてもよい。また、可動鉄心２１は４つの第１貫通孔２２Ａと８つの第２貫通孔２２Ｂおよび４つの連通溝２２Ｃを設けたが、これに限らず、４つ、８つ以外の複数個設けてもよいことは勿論である。 In the above-described embodiment, the protrusions 11 (one not shown) of the bobbin 8 through which the lead wires 12 (one not shown) are inserted are inserted into the insertion holes 6 (one not shown) of the fixed core 1. not shown) to connect the connector 13 accommodated in the connector accommodation hole 5 of the fixed core 1 and the lead wire 12 (one not shown). is derived from a position different from the position where the convex portion 11 (one not shown) of the other end surface 8B of the bobbin 8 is protrudingly formed, and is different from the insertion hole 6 (one is not shown) of the fixed core 1 It may be connected to the connector 13 by inserting it into the connector housing hole 5 through a separately provided insertion hole. Further, the contact portion 18B is formed as a ridge between the tapered surface whose diameter is gradually tapered downward in the axial direction from the second opening end 10B and the inner peripheral surface 14, but the tapered surface is not formed and the second opening 18B is formed. The end 10B may be used as the contact portion. In addition, although the axial ends of the first engaging portion 14A and the axial ends of the second engaging portion 18A are gradually reduced in diameter and formed into a tapered shape, they may be formed into a rectangular shape or the first engaging portion 14A. may be recessed in a spherical shape, and the second engaging portion 18A may be protruded in a spherical shape. In addition, although the projections 11 (one not shown) of the bobbin 8 are integrally formed on the other end surface 8B of the bobbin 8, a cylindrical member such as a steel pipe or a hard tube is joined to the other end surface 8B of the bobbin 8 to form the projections. 11 (one not shown) may be formed. In addition, although the first recess 15A and the second recess 15B are formed in the peripheral surfaces 14 and 16 on both sides of the bobbin 8, respectively, they are formed in the wall surfaces 3B and 3C on both sides of the fixed core 1 to form the first O-ring 17A and the second O-ring 17A. Ring 17B may be accommodated. Moreover, although the end portions of the wall surfaces 3B and 3C on both sides of the annular hole 3 are formed with tapered surfaces 20A and 20B, they may be ridges substantially perpendicular to the suction surface 1A. In addition, the movable iron core 21 has four first through holes 22A, eight second through holes 22B, and four communication grooves 22C. Of course.

１： 固定鉄心
１Ａ：吸引面
３：環状孔
３Ｂ：内側の壁面
３Ｃ：外側の壁面
８：ボビン
１Ａ：一端面
９：コイル
１４：内側の周面
１４Ａ：第１係合部
１５Ａ：第１凹部
１５Ｂ：第２凹部
１６：外側の周面
１７Ａ：第１Ｏリング（第１密封部材）
１７Ｂ：第２Ｏリング（第２密封部材）
１８Ａ：第２係合部
１９：空間
２１：可動鉄心
２４：弁体 1: fixed iron core 1A: suction surface 3: annular hole 3B: inner wall surface 3C: outer wall surface 8: bobbin 1A: one end surface 9: coil 14: inner peripheral surface 14A: first engaging portion 15A: first concave portion 15B: Second recess 16: Outer peripheral surface 17A: First O-ring (first sealing member)
17B: Second O-ring (second sealing member)
18A: Second engaging portion 19: Space 21: Movable iron core 24: Valve body

Claims (4)

コイルへの通電非通電で弁体を作動して流体を制御する電磁弁において、コイルを巻回した略円筒形状のボビンと、ボビンを収容する略環状の環状孔を有する固定鉄心と、通電により固定鉄心に吸引される可動鉄心と、可動鉄心と連結する弁体とを備え、ボビンは固定鉄心の環状孔の壁面と対向する周面に第１係合部を有し、固定鉄心は環状孔の壁面に第１係合部と係合する第２係合部を有し、ボビンは、第１係合部を固定鉄心の第２係合部に係合することで、自身の軸方向の一端面を固定鉄心の可動鉄心を吸引する吸引面より軸方向内方に位置して固定し、固定鉄心の吸引面には、ボビンの軸方向の一端面と環状孔の内側の壁面および外側の壁面とで略環状の空間を窪み形成し、可動鉄心には略環状の空間に対向して一側面と軸方向反対側の他側面との間を貫通する貫通孔を配置し、貫通孔は可動鉄心の径方向で同一円周上に配置して位相を異にした複数の第１貫通孔と、第１貫通孔より径方向内方の同一円周上に配置して位相を異にした複数の第２貫通孔とから成し、第１貫通孔と第２貫通孔とを連通したことを特徴とする電磁弁。 In a solenoid valve that controls a fluid by actuating a valve body by energizing or de-energizing a coil, a substantially cylindrical bobbin around which a coil is wound, a fixed iron core having a substantially annular hole that accommodates the bobbin, A movable iron core attracted to the fixed iron core and a valve body connected to the movable iron core are provided, the bobbin has a first engaging portion on a peripheral surface facing the wall surface of the annular hole of the fixed iron core, The bobbin has a second engaging portion that engages with the first engaging portion on the wall surface of the bobbin, and by engaging the first engaging portion with the second engaging portion of the fixed core, One end surface of the fixed iron core is positioned axially inward from the suction surface for attracting the movable iron core and is fixed. A substantially annular space is recessed with the wall surface, and a through hole is arranged in the movable iron core so as to penetrate between one side surface facing the substantially annular space and the other side surface on the opposite side in the axial direction, and the through hole is movable. A plurality of first through holes arranged on the same circumference in the radial direction of the iron core and having different phases, and a plurality of first through holes arranged on the same circumference radially inward from the first through holes and having different phases. and a second through hole, wherein the first through hole and the second through hole are communicated with each other. 前記ボビンの前記内側の周面と前記環状孔の前記内側の壁面との間で、前記空間の近傍に略環状の第１密封部材を配置し、前記ボビンの外側の周面と前記環状孔の前記外側の壁面との間で、前記空間の近傍に略環状の第２密封部材を配置したことを特徴とする請求項１に記載の電磁弁。 A substantially annular first sealing member is disposed in the vicinity of the space between the inner peripheral surface of the bobbin and the inner wall surface of the annular hole, and the outer peripheral surface of the bobbin and the annular hole are separated from each other. 2. The solenoid valve according to claim 1, wherein a substantially annular second sealing member is arranged in the vicinity of the space between the outer wall surface and the outer wall surface. 前記第１密封部材は前記ボビンの前記内側の周面に窪み形成した略環状の第１凹部に収容し、前記第２密封部材は前記ボビンの前記外側の周面に窪み形成した略環状の第２凹部に収容したことを特徴とする請求項２に記載の電磁弁。 The first sealing member is accommodated in a substantially annular first recess formed in the inner peripheral surface of the bobbin, and the second sealing member is a substantially annular first recess formed in the outer peripheral surface of the bobbin. 3. The solenoid valve according to claim 2, wherein the solenoid valve is housed in two recesses. 前記空間は前記環状孔の前記内側の壁面を前記吸引面へ向けて漸次縮径するテーパー状に形成すると共に、前記外側の壁面を前記吸引面へ向けて漸次拡径するテーパー状に形成したことを特徴とする請求項２または請求項３に記載の電磁弁。 The space is tapered such that the inner wall surface of the annular hole gradually decreases in diameter toward the suction surface and the outer wall surface gradually increases in diameter toward the suction surface. 4. The solenoid valve according to claim 2 or 3, characterized by:
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