JP3932898B2

JP3932898B2 - Solenoid valve device

Info

Publication number: JP3932898B2
Application number: JP2002005744A
Authority: JP
Inventors: 卓伊東; 兼久長崎
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 2002-01-15
Filing date: 2002-01-15
Publication date: 2007-06-20
Anticipated expiration: 2022-01-15
Also published as: JP2003207069A

Description

【０００１】
【発明の属する技術分野】
本発明は、流体通路を開閉制御する電磁弁装置に関する。
【０００２】
【従来の技術】
従来、特開２００１−８２６２５号公報、特開２０００−６５２３３号公報等に開示されているように、シート部材に形成された流体通路を開閉制御する電磁弁装置が知られている。この種の電磁弁装置では、コイルへの通電により生じる磁気吸引力により可動部材を駆動しその可動部材により弁部材を動かすことで、弁部材をシート部材の弁座に着座させ、あるいは弁座から離座させる。
【０００３】
【発明が解決しようとする課題】
このような電磁弁装置のシート部材として、筒状に形成され、インサート成形により樹脂製のベース部材内に固定されるものが公知である。また、筒状のシート部材の流体通路をベース部材の開口に正確に連通させるために、上記特開２００１−８２６２５号公報には、シート部材の一端部に突起部を設け、その突起部の外周壁を成形型のピンで挟み込みシート部材を周方向で位置決めしてインサート成形する技術が開示されている。この技術によると、成形型のピンで突起部を挟み込むために、突起部の両サイドを凹ませて形成した空間に、分かれたピンの先端部をそれぞれ配置する。そのためシート部材のサイズを大きくできない場合には、突起部の両サイドにピン配置用の空間を大きく形成できず、それに応じてピン先端部の横断面積を小さくしなければならないため、ピン先端部が折れインサート成形できなくなるという問題があった。
【０００４】
またシート部材として、上記特開２０００−６５２３３号公報には、ボール状の弁部材を両側から挟み込む構造のものが開示されている。このシート部材には、案内面に摺接する弁部材を所定方向に案内する案内部が２つの弁座の間に設けられている。しかし案内部の案内面は、２つの弁座を形成する部材間を連続して延びるように設けられているため、特に低温の流体については案内面との接触抵抗によりその流動が阻害され流量が減少してしまうという問題があった。
【０００５】
本発明の目的は、成形型の強度を確保しつつ、インサート成形時のシート部材の回転を阻止する電磁弁装置を提供することにある。
また本発明の他の目的は、低温流体の流量の減少を抑制する電磁弁装置を提供することにある。
【０００６】
【課題を解決するための手段】
本発明の請求項１に記載の電磁弁装置によると、シート部材は、小径内周壁と、小径内周壁の軸方向一方の側に小径内周壁よりも大径に形成され小径内周壁とで段差を形成する大径内周壁とを有しているので、大径内周壁の内側に、径方向に連続する柱状の空間（内孔）を大きく形成できる。また小径内周壁及び大径内周壁が囲む内孔は、大径内周壁で囲まれる部分の反小径内周壁側でシート部材の外壁に開口しているので、インサート成形に用いる成形型のピンを例えば柱状に形成し大径内周壁の内側に嵌合させるようにすれば、ピンの横断面積を可及的に大きく設定でき、それによりピン強度を確保することができる。
【０００７】
また請求項１に記載の電磁弁装置によると、大径内周壁は、中心軸からの半径寸法が変化している変化部を有する。例えば大径内周壁に嵌合される成形型のピンの外周壁が変化部に当接するようにピン形状を設定すれば、変化部をピンの当接部位に押し付ける向きの軸周りの回転力を、ピン外周壁から変化部に作用する反作用力により相殺できる。よってインサート成形時にシート部材の回転を阻止することができるので、シート部材を位置決めしてベース部材の開口に流体通路を正確に連通させることができる。そのため、流体通路の開閉制御の精度が高くなる。
このように請求項１に記載の電磁弁装置によれば、成形型の強度を確保しつつ、インサート成形時のシート部材の回転を阻止できる。
【０００８】
本発明の請求項２に記載の電磁弁装置によると、変化部は、大径内周壁の反小径内周壁側端部から小径内周壁側に向かって所定幅で延びる平坦面で構成されている。すなわち平坦面は幅方向一端部から他端部に向かうにしたがい、中心軸からの距離を周方向で変化させている。したがって平坦面という簡単な構成で変化部を実現できるので、変化部を設けることによるコストアップが抑えられる。
【０００９】
本発明の請求項３に記載の電磁弁装置によると、大径内周壁は、中心軸を挟んで互いに平行な２つの前記平坦面を有している。そのため、中心軸を挟む２個所でシート部材の回り止めをすることができるので、インサート成形時にシート部材の位置決め精度が向上し、ひいては流体通路の開閉制御の精度が向上する。
【００１０】
本発明の請求項４に記載の電磁弁装置によると、弁部材はボール部材で構成され、ボール部材が摺接する案内部の案内面は、２つのシート部間を延伸し、その延伸長さが２つのシート部間の間隔よりも短く設定されている。そのため、特に低温の流体について案内面による流動抵抗を低減できるので、流量の減少を抑制でき、流体の流動応答性を高めることができる。
【００１１】
本発明の請求項５及び６に記載の電磁弁装置によると、案内面は、２つのシート部の一方から他方側に向かって延伸し、その延伸長さが、前記一方のシート部と、前記他方のシート部の弁座に着座したボール部材の中心との離間距離よりも長く、かつ２つのシート部間の間隔よりも短く設定されている。これにより、２つのシート部の対向方向両側にボール部材を案内するという機能を案内面に確実に実現させつつ、低温流体の流量減少を抑制できる。
【００１２】
尚、請求項４、５及び６に記載の電磁弁装置では、２つのシート部のいずれか又は双方が小径内周壁及び大径内周壁を有しているが、２つのシート部がいずれも小径内周壁及び大径内周壁を有しない以外は請求項４、５及び６に記載の電磁弁装置と同一の構成で電磁弁装置を構成してもよい。
【００１３】
【発明の実施の形態】
以下、本発明の実施の形態を示す実施例を図面に基づいて説明する。
本発明を常開型の三方向電磁弁装置に適用した一実施例を図２及び図３に示す。図２は、本実施例による電磁弁装置１０のコイルに通電していない状態を示し、図３は、電磁弁装置１０のコイルに通電した状態を示している。
【００１４】
ベース部材１２は、樹脂材で概ね円筒状に形成されている。ベース部材１２はその一端部側にシート固定部１３を有し、他端部及び中央部にそれぞれコネクタ固定部１４及びボビン１５を有している。シート固定部１３の内周側にシート部材５０が固定されている。シート固定部１３には、開口としての入力口１６、出力口１７及びドレイン口１８が形成されている。入力口１６は、シート固定部１３の先端部に開口している。出力口１７は、入力口１６よりもボビン１５側に離間してシート固定部１３の側壁部に開口し、シート部材５０の貫通孔７４を露出させている。ドレイン口１８は、入力口１６及び出力口１７よりもボビン１５側に離間してシート固定部１３の側壁部に開口している。入力口１６、出力口１７及びドレイン口１８は、シート部材５０の流体通路５６に連通している。
【００１５】
ヨーク２０、コア２１、ムービングコア２２及びコイル２３は、ソレノイドを構成している。
ヨーク２０は、磁性材で概ね円筒状に形成されている。ヨーク２０の外筒部２４の内周側にボビン１５及びコア２１が同軸上に収容され、シート固定部１３及びコネクタ固定部１４の端部がヨーク２０の両端部から外側に突出している。ヨーク２０のシート固定部側端部には、コア２１のフランジ部２６がかしめ固定されている。ヨーク２０のコネクタ固定部側端部には、非磁性材からなるプレート２８が固定されている。プレート２８は、ヨーク２０の打ち出しによるかしめ固定、あるいは溶接等により固定されている。ヨーク２０は、外筒部２４と同軸の内筒部２５を有する。内筒部２５は、ヨーク２０のコネクタ固定部側端部からシート固定部１３側に向かって所定長さで延び、ボビン１５のコネクタ固定部側端部に内挿されている。
【００１６】
コア２１は磁性材で概ね円筒状に形成され、その筒部２７がインサート成形によりボビン１５の内周側に同軸上に固定されている。コア２１の筒部２７とヨーク２０の内筒部２５とは、軸方向でギャップ２９をあけて対向している。コア２１の筒部２７は、大径内壁３１と、大径内壁３１の反内筒部側に大径内壁３１よりも小径に形成され大径内壁３１とで段差を形成する小径内壁３２とを有する。
【００１７】
可動部材としてのムービングコア２２は、磁性材で概ね円筒状に形成されている。ムービングコア２２はヨーク２０の内筒部２５及びボビン１５の内周側に同軸上に収容され、軸方向両側に往復移動自在である。ムービングコア２２の外周壁と内筒部２５の内周壁との間には図示しないサイドギャップが形成されている。ムービングコア２２はその一端部をコア２１に対向させシャフト４０に対向又は当接させ、他端部をプレート２８に対向又は当接させる。ムービングコア２２のコア側端部には、コア２１に近づくにつれ外径が小さくなるテーパ部３３が形成されている。コア２１のムービングコア側端部には、テーパ部３３に対応した形状に凹む凹部３４が形成されている。ムービングコア２２のコア側端部はその端面の一部が凹まされ、凹溝３５を形成している。ムービングコア２２とプレート２８との間に形成されるギャップ３０（図３参照）は、ムービングコア２２の内孔、凹溝３５とシャフト４０の端面との間に形成されるギャップ、テーパ部３３と凹部３４との間に形成されるギャップを通じ、前記ギャップ２９に連通している。それにより、ムービングコア２２の磁気吸引作動が阻害されないようになっている。
【００１８】
コイル２３はボビン１５の外周に巻回され、ボビン１５とヨーク２０の外筒部２４との間に配置されている。それによりボビン１５は、ヨーク２０の内筒部２５、ムービングコア２２及びコア２１の外周を囲んでいる。コネクタ３８は樹脂材で形成され、コネクタ固定部１４の突出端部とプレート２８に固定されている。コイル２３は、コネクタ固定部１４にモールド固定されたターミナル３９と、コネクタ固定部１４に圧入等で固定されたターミナル３７とに電気的に接続している。ターミナル３９を通じてコイル２３に電流が供給されると、ヨーク２０、ムービングコア２２及びコア２１により構成された磁気回路に磁束が生じ、ムービングコア２２とコア２１との間に磁気吸引力が働く。すると、ムービングコア２２はコア２１に向かって、すなわち図２の左方向に移動する。
【００１９】
シャフト４０は、非磁性材で概ね円柱状に形成されている。シャフト４０は、コア２１及びシート固定部１３の内周側に同軸上に収容され、軸方向両側に往復移動自在である。シャフト４０は、第一摺動部４１、第二摺動部４２、中継部４３及び当接部４４を有する。第一摺動部４１は所定径で延伸し、コア２１の大径内壁３１に摺接可能に嵌合されている。第一摺動部４１のムービングコア側端部はムービングコア２２に当接可能である。第二摺動部４２は第一摺動部４１の反ムービングコア側端部に接続され、第一摺動部４１より小径に延伸し、第一摺動部４１とで段差を形成している。第二摺動部４２はコア２１の小径内壁３２に摺接可能に嵌合されている。シャフト４０の上記段差とコア２１の内周壁の前記段差との間に圧縮コイルスプリング４５が介装されている。圧縮コイルスプリング４５はシャフト４０をムービングコア２２側に向かって、すなわち図２及び図３の右方向に付勢している。中継部４３は第二摺動部４２の反第一摺動部側端部に接続され、第二摺動部４２より小径に延伸している。当接部４４は中継部４３の反第二摺動部側端部に接続され、中継部４３より小径に延伸している。当接部４４の反中継部側端部はシート部材５０の第一シート部５１の内孔７１に進入し、ボール部材５８に当接可能である。
【００２０】
シート部材５０は、図１〜図３に示すように、それぞれ概ね円筒状の第一シート部５１、第二シート部５２、案内部５４及び接続部５５を同軸上に有する。第一シート部５１は、軸方向で案内部５４及び接続部５５を挟んで第二シート部５２に対向している。尚、図１に示すように、第二シート部５２と案内部５４及び接続部５５とは、中心軸Ａに垂直な二点鎖線で表される仮想平面Ｓを境に分けられている。第一シート部５１、第二シート部５２、案内部５４及び接続部５５の各内孔等で流体通路５６が形成されている。流体通路５６には第一シート部５１と第二シート部５２との間で、弁部材としてのボール部材５８が収容されている。シート部材５０は、第一シート部５１が第二シート部５２よりも入力口１６に近接するようにシート固定部１３の内周側に同軸上に配置されている。
【００２１】
第一シート部５１はステンレス等の金属材で形成されている。第一シート部５１の一端部６７は、第二シート部５２の一端部６８に間隔をあけて対向している。第二シート部５２に対向する第一シート部５１の対向端部６７のうち後述する小径内周壁６１の反大径内周壁側端部の縁となる部分に、ボール部材５８が着座可能な第一弁座６３が設けられている。
【００２２】
第一シート部５１は、小径内周壁６１と、小径内周壁６１の反第二シート部側に小径内周壁６１よりも大径に形成され小径内周壁６１とで段差を形成する大径内周壁６２とを有する。流体通路５６を形成する第一シート部５１の内孔７１は、大径内周壁６２で囲まれる部分の反小径内周壁側でシート部材５０の外壁に開口し、ドレイン口１８に連通している。第一シート部５１の内孔７１にはシャフト４０が進入している。
【００２３】
小径内周壁６１の中心軸Ａからの半径寸法は、周方向では一定となるように、軸方向では反大径内周壁側端部で大径内周壁側端部よりも僅かに小さくなるように、その反大径内周壁側端部の第一弁座６３に着座するボール部材５８の半径寸法に応じて設定される。
【００２４】
大径内周壁６２は、反小径内周壁側端部から小径内周壁６１側に向かって所定幅で延びる内周平坦面８０を２つ有する。それら内周平坦面８０，８０は、中心軸Ａを挟んで互いに平行に対向する所謂二面幅形態で形成されている。各内周平坦面８０，８０は、幅方向中央部から両端部に向かうにしたがい中心軸Ａからの距離が長くなるように形成されている。すなわち大径内周壁６２は、各内周平坦面８０，８０の形成部分において中心軸Ａからの半径寸法が周方向で変化している。各内周平坦面８０，８０が特許請求の範囲に記載の「変化部」及び「平坦面」を構成している。
【００２５】
尚、内周平坦面８０，８０の形成部分における大径内周壁６２の半径寸法は軸方向では一定となるように、あるいは軸方向で反小径内周壁側端部から小径内周壁６１側に向かうにつれ小さくなるように設定される。但し、内周平坦面８０，８０の形成部分での半径寸法については、内周平坦面８０，８０上の任意の個所で小径内周壁６１の大径内周壁側端部の半径寸法よりも大きくなるように設定されるが、内周平坦面８０，８０上の一部で小径内周壁６１の大径内周壁側端部の半径寸法以下となるように設定することもできる。また、大径内周壁６２のうち内周平坦面８０，８０を除く部分の半径寸法は、周方向及び軸方向で小径内周壁６１の大径内周壁側端部の半径寸法よりも大きな一定値に、あるいは小径内周壁６１の大径内周壁側端部の半径寸法よりも大きく、かつ周方向では一定であるが軸方向では反小径内周壁側端部から小径内周壁６１側に向かうにつれ小さくなるように設定される。
【００２６】
第一シート部５１は、小径内周壁６１の外周側に形成される小径外周壁６５と、大径内周壁６２の外周側に小径外周壁６５よりも大径に形成され小径外周壁６５とで段差を形成する大径外周壁６６とを有する。大径外周壁６６は、内周平坦面８０，８０に対応する周方向の２個所において、内周平坦面８０と同様な構成の外周平坦面８２を２つ有する。
【００２７】
第二シート部５２は、ステンレス等の金属材で第一シート部５１とは別体に形成されている。第一シート部５１に対向する第二シート部５２の対向端部６８に、ボール部材５８が着座可能な第二弁座６４が設けられている。第二シート部５２は、流体通路５６を形成する内孔７２を入力口１６に連通させている。
【００２８】
接続部５５は、第二シート部５２と一体に同軸上に形成されている。接続部５５は、第二シート部５２の対向端部６８から第一シート部５１側に向かって延出している。接続部５５の延出端部は第一シート部５１の小径外周壁６５の外側に嵌合され、それにより第二シート部５２が第一シート部５１に接続されている。接続部５５には、その側壁部を貫通し流体通路５６を形成する貫通孔７４が出力口１７に対応した位置に設けられている。
【００２９】
案内部５４は、接続部５５の内周側において第二シート部５２と一体に同軸上に形成されている。案内部５４は、第二シート部５２の対向端部６８から第一シート部５１側に向かって延出している。案内部５４の内周面９０は図１に示すように、第二シート部５２の対向端部６８の端面と、第一シート部５１の第一弁座６３に着座したボール部材５８の中心Ｏとの離間距離Ｌ_Oよりも長く、かつ第二シート部５２の対向端部６８の端面と第一シート部５１の対向端部６７の端面との離間距離Ｌ_dよりも短い長さＬ_gで延伸している。案内部５４及び接続部５５の内周側にボール部材５８が軸方向に往復移動可能に収容されている。ボール部材５８は案内部５４の内周面９０に摺接することで、案内部５４の軸方向両側に、すなわち２つのシート部５１，５２の対向方向両側に案内される。内周面９０の延伸長さが上述したように設定されているので、第一弁座６３及び第二弁座６４の間においてボール部材５８が内周面９０に沿って確実に案内される。案内部５４の内周面９０が特許請求の範囲に記載の「案内面」を構成しており、以下、内周面９０を案内面９０という。
【００３０】
案内部５４には、その側壁部を切り欠き流体通路５６を形成するスリット７５が接続部５５の貫通孔７４に対応した位置に設けられている。それにより、スリット７５と貫通孔７４とが出力口１７に連通している。スリット７５及び貫通孔７４が特許請求の範囲に記載の「連通孔」を構成している。
【００３１】
ボール部材５８は、図１及び図２に示すようにシート部材５０の第一弁座６３に着座することで、流体通路５６のうち第一シート部５１の内孔７１とその他の部分との連通を遮断する。またボール部材５８は、図３に示すようにシート部材５０の第二弁座６４に着座することで、流体通路５６のうち第二シート部５２の内孔７２とその他の部分との連通を遮断する。
【００３２】
次に、電磁弁装置１０の製造手順について説明する。
（１）案内部５４及び接続部５５の内周側にボール部材５８を収容した後、接続部５５を介して第二シート部５２を第一シート部５１に接続し、シート部材５０を形成する。
（２）シート部材５０、コア２１及びターミナル３９を樹脂成形型のキャビティ内に配置しそのキャビティに樹脂材を充填することで、シート部材５０、コア２１及びターミナル３９をベース部材１２にインサート成形し固定する。さらに、ベース部材１２のコネクタ固定部１４にターミナル３７を圧入等で固定する。
【００３３】
（３）ベース部材１２のボビン１５にコイル２３を巻回した後、ターミナル３９及びターミナル３７にコイル２３の端部をフュージング固定する。
（４）コア２１の内周側に圧縮コイルスプリング４５及びシャフト４０を挿入する。
（５）ヨーク２０の打ち出しによるかしめ固定あるいは溶接等により、プレート２８をヨーク２０の一端部に接合する。
【００３４】
（６）ヨーク２０の内筒部２５にムービングコア２２を挿入し、その内筒部２５をボビン１５のコネクタ固定部側端部に内挿しつつヨーク２０の外筒部２４にボビン１５及びコイル２３を内挿する。その後、ヨーク２０の反プレート側端部をコア２１のフランジ部２６にかしめて固定する。
（７）ターミナル３９を所定形状に曲げ加工する。
（８）コネクタ３８をコネクタ固定部１４及びプレート２８に固定する。
【００３５】
ところで、上記（２）のインサート成形時に使用する樹脂成形型は、図４に示すようにシート部材５０の大径内周壁６２の内側に嵌合可能で、外周壁が各内周平坦面８０，８０に当接可能な柱状のピン１００を備えている。シート部材５０では、ボール部材５８のサイズに応じて半径寸法が決まる小径内周壁６１よりも大径内周壁６２の半径寸法が大きく設定されるので、大径内周壁６２の内側に比較的大きな空間が形成されている。よって、大径内周壁６２に嵌合させるピン１００の横断面積を大きく設定することができるので、ピン１００の強度を充分に確保することができる。
【００３６】
樹脂成形型のピン１００を大径内周壁６２に嵌合し各内周平坦面８０，８０に当接させた状態において、シート部材５０を中心軸Ａ周りの一方に回転させる回転力は、各内周平坦面８０，８０の幅方向の一端部近傍でピン１００の外周壁を押圧するので、その反作用としてピン１００から各内周平坦面８０，８０に加わる力により打ち消される。また、シート部材５０を中心軸Ａ周りの他方に回転させる回転力は、各内周平坦面８０，８０の幅方向の他端部近傍でピン１００の外周壁を押圧するので、その反作用としてピン１００から各内周平坦面８０，８０に加わる力で打ち消される。したがって大径内周壁６２にピン１００を嵌合しインサート成形を行えば、シート部材５０は周方向両側への回転が阻止されるので、貫通孔７４及びスリット７５がベース部材１２の出力口１７に正確に位置合わせされ連通する。本実施例では、２つの内周平坦面８０，８０でシート部材５０の回り止めをするので、シート部材５０を高精度に位置決めできる。またシート部材５０の回り止め機能を平坦面８０という簡単な構成で実現しているので、シート部材５０（第一シート部５１）を容易にかつ安価に形成できる。
【００３７】
本実施例のシート部材５０は、複数の部材で構成されボール部材５８を収容するように構成されているが、樹脂成形型のピン１００を嵌合させる大径内周壁６２が囲む空間（内孔）を反小径内周壁側でシート部材５０の外壁に開口させているので、複数部材及びボール部材５８をインサート成形に先立って組み付けておくことができる。そのため、インサート成形によりベース部材１２に固定したシート部材５０の一部に残りの部材を組み付ける場合に比べ、作業性が向上する。
また本実施例のシート部材５０は、大径外周壁６６に２つの平坦面８２，８２が設けられているので、例えばインサート成形に際し貫通孔７４を外部から覆う板状の部材を平坦面８２，８２に当接させておくことで、貫通孔７４からの樹脂材の流入を防止することができる。
【００３８】
以上のようにして製造される電磁弁装置１０は、大径外周壁６６に２つの外周平坦面８２，８２が設けられ、それら外周平坦面８２，８２にベース部材１２の内周壁が密接する。そのため、内周平坦面８０，８０にピン１００の外周壁を当接させる場合と同様の原理により、外周平坦面８２，８２でベース部材１２の内周壁を押圧する回転力がその反作用力で打ち消される。したがって、使用によるシート部材５０の周方向両側への回転が阻止される。
【００３９】
次に、電磁弁装置１０の作動について説明する。
コイル２３への通電を遮断した状態では、図２に示すように、シャフト４０が圧縮コイルスプリング４５により同図の右方向に付勢され、当該シャフト４０に当接したムービングコア２２を同図の右方向に押しプレート２８に当接させる。このときボール部材５８は、入力口１６から供給される流体の圧力により第二弁座６４から離座し、第一弁座６３に着座する。その結果、入力口１６と出力口１７とが流体通路５６を通じて連通する一方、入力口１６及び出力口１７とドレイン口１８との連通が遮断される。入力口１６から流入する流体は出力口１７から流出し、出力口１７に接続される部材内に所定の流体圧で流入する。
【００４０】
コイル２３に電流を供給すると、ムービングコア２２とコア２１の間に磁気吸引力が発生し、その磁気吸引力によりムービングコア２２及びシャフト４０が圧縮コイルスプリング４５の付勢力に抗して、図２に示す状態から同図の左方向に移動する。このときシャフト４０の当接部４４は、第一シート部５１の内孔７１に進入しボール部材５８に当接し、ボール部材５８を図２の左方向に移動させる。それにより、図３に示すようにボール部材５８が第一弁座６３から離座し、第二弁座６４に着座する。その結果、出力口１７とドレイン口１８とが流体通路５６を通じて連通する一方、出力口１７及びドレイン口１８と入力口１６との連通が遮断される。出力口１７からドレイン口１８側に流体が排出されるので、出力口１７に接続される部材に加わっていた流体圧が低下する。
【００４１】
以上説明した電磁弁装置１０では、貫通孔７４及びスリット７５がベース部材１２の出力口１７に正確に連通しているので、流体通路５６の開閉を高精度に制御できる。
また、電磁弁装置１０のシート部材５０に設けられる案内面９０は、内孔７２が入力口１６に連通する第二シート部５２から、内孔７１がドレイン口１８に連通する第一シート部５１側に向かって第一シート部５１には至らない長さで延伸している。そのため、第二シート部５２の第二弁座６４からボール部材５８が離座したときに特に低温の流体が案内面９０から受ける流動抵抗は、２つのシート部５１，５２間を連続して延びる案内面を設けた場合に比べて低減される。したがって、出力口１７からドレイン口１８側に排出される流体の流量を温度によらず所望の量に制御でき、それにより流体の流動応答性を高めることができる。
【００４２】
以上説明した上記実施例では、図１に示すようにシート部材５０の大径内周壁６２に変化部としての平坦面８０が２つ設けられていたが、例えば図５に変形例を示すように平坦面８０を１つだけ有する所謂Ｄカット形状に大径内周壁６２’を形成してもよいし、３つ以上の平坦面を有するように大径内周壁を形成してもよい。
また上記実施例では、中心軸Ａからの半径寸法を周方向で変化させる平坦面８０で変化部が実現されていたが、中心軸からの半径寸法を径方向で変化させる平坦面で変化部を実現してもよい。その他、中心軸からの半径寸法を周方向で変化させる楕円曲面等の湾曲面で変化部を実現してもよく、またその場合には、必要数の湾曲面を形成することができる。
【００４３】
さらに上記実施例では、２つのシート部５１，５２を有するシート部材５０について、その一方のシート部５１に小径内周壁６１及び大径内周壁６２が設けられ、小径内周壁６１の反大径内周壁側端部に弁座６３が設けられていたが、例えば小径内周壁及び大径内周壁を１つの筒状シート部からなるシート部材に設け、小径内周壁の反大径内周壁側端部と大径内周壁側端部との少なくとも一方に弁座を設けるようにしてもよい。
【００４４】
さらに上記実施例では、内孔７２が入力口１６に連通する一方のシート部５２から、内孔７１がドレイン口１８に連通する他方のシート部５１側に向かってその他方のシート部５１には至らない長さで案内面９０が延伸していたが、それとは逆に、内孔がドレイン口に連通する一方のシート部から、内孔が入力口に連通する他方のシート部側に向かってその他方のシート部には至らない長さで案内面を延伸させてもよい。また、一方のシート部の端部から他方のシート部側に離間した位置を起点に、その起点位置から他方のシート部側に向かってその他方のシート部には至らない長さで延伸する案内面を形成してもよい。
【００４５】
さらに上記実施例では、概ね円筒状の案内部５４がシート部材５０に設けられていたが、それぞれ２つのシート部間を延伸しボール部材の周囲で互いに間隔をあけて配置される複数の案内部をシート部材５０に設けてもよい。
さらに上記実施例では、常開型の三方向電磁弁装置に本発明を適用したが、常閉型の三方向電磁弁装置に本発明を適用してもよいし、二方向電磁弁装置に本発明を適用してもよい。
【図面の簡単な説明】
【図１】本発明の一実施例によるシート部材を示す図であって、（Ａ）は平面図であり、（Ｂ）は（Ａ）におけるＢ−Ｂ断面に相当する模式図である。
【図２】本発明の一実施例による電磁弁装置の一作動状態を示す断面図である。
【図３】本発明の一実施例による電磁弁装置の別の作動状態を示す断面図である。
【図４】図１に示すシート部材に樹脂成形型のピンを嵌入した状態を示す図であって、（Ａ）は横断面図、（Ｂ）は（Ａ）におけるＢ−Ｂ断面に相当する模式図である。
【図５】図１に示すシート部材の変形例を示す平面図である。
【符号の説明】
１０電磁弁装置
１２ベース部材
１３シート固定部
１６入力口
１７出力口
１８ドレイン口
２２ムービングコア（可動部材）
２３コイル
４０シャフト
５０シート部材
５１第一シート部
５２第二シート部
５４案内部
５６流体通路
５８ボール部材
６１小径内周壁
６２，６２’ 大径内周壁
６３第一弁座
６４第二弁座
６７第一シート部の対向端部
６８第二シート部の対向端部
７１第一シート部の内孔
７２第二シート部の内孔
７４貫通孔（連通孔）
７５スリット（連通孔）
８０内周平坦面（平坦面）
９０内周面（案内面）
１００ピン
Ａ中心軸
Ｏ中心[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic valve device that controls opening and closing of a fluid passage.
[0002]
[Prior art]
Conventionally, as disclosed in JP-A-2001-82625 and JP-A-2000-65233, etc., an electromagnetic valve device that controls opening and closing of a fluid passage formed in a seat member is known. In this type of electromagnetic valve device, the movable member is driven by the magnetic attractive force generated by energizing the coil and the valve member is moved by the movable member, so that the valve member is seated on the valve seat of the seat member or from the valve seat. Take a seat away.
[0003]
[Problems to be solved by the invention]
As a sheet member of such an electromagnetic valve device, a member formed in a cylindrical shape and fixed in a resin base member by insert molding is known. Further, in order to accurately communicate the fluid passage of the cylindrical sheet member with the opening of the base member, Japanese Patent Application Laid-Open No. 2001-82625 provides a protrusion at one end of the sheet member, and the outer periphery of the protrusion A technique is disclosed in which insert molding is performed by sandwiching a wall with pins of a molding die and positioning a sheet member in a circumferential direction. According to this technique, in order to sandwich the protrusions with the pins of the mold, the tip portions of the divided pins are arranged in spaces formed by recessing both sides of the protrusions. For this reason, when the size of the sheet member cannot be increased, it is not possible to form a large space for pin arrangement on both sides of the protrusion, and the cross-sectional area of the pin tip must be reduced accordingly. There was a problem that bending insert molding could not be performed.
[0004]
Further, as a seat member, JP-A-2000-65233 discloses a structure in which a ball-shaped valve member is sandwiched from both sides. The seat member is provided with a guide portion between two valve seats for guiding the valve member slidingly contacting the guide surface in a predetermined direction. However, since the guide surface of the guide portion is provided so as to continuously extend between the members forming the two valve seats, the flow of the low temperature fluid is hindered by the contact resistance with the guide surface and the flow rate is reduced. There was a problem that it decreased.
[0005]
The objective of this invention is providing the solenoid valve apparatus which prevents rotation of the sheet | seat member at the time of insert molding, ensuring the intensity | strength of a shaping | molding die.
Another object of the present invention is to provide an electromagnetic valve device that suppresses a decrease in the flow rate of a cryogenic fluid.
[0006]
[Means for Solving the Problems]
According to the solenoid valve device of the first aspect of the present invention, the seat member has a small diameter inner peripheral wall and a step between the small diameter inner peripheral wall formed on the one side in the axial direction of the small diameter inner peripheral wall and having a larger diameter than the small diameter inner peripheral wall. Therefore, a columnar space (inner hole) continuous in the radial direction can be formed inside the large diameter inner peripheral wall. Further, the inner hole surrounded by the small inner diameter wall and the large inner diameter wall is open to the outer wall of the sheet member on the side opposite to the inner diameter wall of the portion surrounded by the large inner diameter wall. For example, if it is formed in a columnar shape and fitted inside the large-diameter inner peripheral wall, the cross-sectional area of the pin can be set as large as possible, thereby ensuring the pin strength.
[0007]
According to the electromagnetic valve device of the first aspect, the large-diameter inner peripheral wall has the changing portion in which the radial dimension from the central axis changes. For example, if the pin shape is set so that the outer peripheral wall of the molding pin fitted to the large inner peripheral wall comes into contact with the changing portion, the rotational force around the axis in the direction in which the changing portion is pressed against the contact portion of the pin is set. This can be canceled by the reaction force acting on the changing portion from the outer peripheral wall of the pin. Therefore, since the rotation of the sheet member can be prevented at the time of insert molding, the sheet member can be positioned and the fluid passage can be accurately communicated with the opening of the base member. Therefore, the accuracy of the fluid passage opening / closing control is increased.
Thus, according to the solenoid valve device of the first aspect, it is possible to prevent the rotation of the sheet member during the insert molding while ensuring the strength of the mold.
[0008]
According to the electromagnetic valve device of the second aspect of the present invention, the changing portion is configured by a flat surface extending with a predetermined width from the end portion on the side of the small-diameter inner peripheral wall of the large-diameter inner peripheral wall toward the small-diameter inner peripheral wall. . That is, the flat surface changes the distance from the central axis in the circumferential direction as it goes from one end in the width direction to the other end. Therefore, since the change portion can be realized with a simple configuration of a flat surface, an increase in cost due to the provision of the change portion can be suppressed.
[0009]
According to the solenoid valve device of the third aspect of the present invention, the large-diameter inner peripheral wall has the two flat surfaces parallel to each other with the central axis interposed therebetween. For this reason, the sheet member can be prevented from rotating at two positions sandwiching the central axis, so that the positioning accuracy of the sheet member is improved at the time of insert molding, and as a result, the accuracy of opening / closing control of the fluid passage is improved.
[0010]
According to the electromagnetic valve device according to claim 4 of the present invention, the valve member is constituted by a ball member, and the guide surface of the guide portion in which the ball member is in sliding contact extends between the two seat portions, and the extension length thereof is It is set shorter than the interval between the two sheet portions. Therefore, the flow resistance due to the guide surface can be reduced particularly for a low-temperature fluid, so that a decrease in the flow rate can be suppressed and the fluid flow response can be enhanced.
[0011]
According to the solenoid valve device of the fifth and sixth aspects of the present invention, the guide surface extends from one of the two sheet parts toward the other side, and the extension length of the one of the one sheet part, It is longer than the distance from the center of the ball member seated on the valve seat of the other seat portion, and shorter than the interval between the two seat portions. Accordingly, it is possible to suppress the decrease in the flow rate of the low-temperature fluid while reliably realizing the function of guiding the ball member on both sides in the opposing direction of the two seat portions on the guide surface.
[0012]
In addition, in the electromagnetic valve device according to claims 4, 5 and 6, either one or both of the two seat portions have a small diameter inner peripheral wall and a large diameter inner peripheral wall, but both of the two seat portions have a small diameter. The electromagnetic valve device may be configured with the same configuration as the electromagnetic valve device according to claims 4, 5 and 6, except that the inner peripheral wall and the large-diameter inner peripheral wall are not provided.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, examples showing embodiments of the present invention will be described with reference to the drawings.
2 and 3 show an embodiment in which the present invention is applied to a normally open type three-way solenoid valve device. FIG. 2 shows a state where the coil of the electromagnetic valve device 10 according to the present embodiment is not energized, and FIG. 3 shows a state where the coil of the electromagnetic valve device 10 is energized.
[0014]
The base member 12 is made of a resin material and is generally cylindrical. The base member 12 has a sheet fixing portion 13 on one end side thereof, and a connector fixing portion 14 and a bobbin 15 on the other end portion and the central portion, respectively. A sheet member 50 is fixed to the inner peripheral side of the sheet fixing portion 13. The sheet fixing portion 13 is formed with an input port 16, an output port 17 and a drain port 18 as openings. The input port 16 opens at the tip of the sheet fixing portion 13. The output port 17 is spaced from the input port 16 on the bobbin 15 side and opens in the side wall portion of the sheet fixing portion 13 to expose the through hole 74 of the sheet member 50. The drain port 18 is spaced from the input port 16 and the output port 17 on the bobbin 15 side and opens in the side wall portion of the sheet fixing unit 13. The input port 16, the output port 17, and the drain port 18 communicate with the fluid passage 56 of the sheet member 50.
[0015]
The yoke 20, the core 21, the moving core 22, and the coil 23 constitute a solenoid.
The yoke 20 is made of a magnetic material and is generally cylindrical. The bobbin 15 and the core 21 are coaxially accommodated on the inner peripheral side of the outer cylindrical portion 24 of the yoke 20, and the end portions of the sheet fixing portion 13 and the connector fixing portion 14 protrude outward from both end portions of the yoke 20. A flange portion 26 of the core 21 is caulked and fixed to the end portion of the yoke 20 on the seat fixing portion side. A plate 28 made of a nonmagnetic material is fixed to the end portion of the yoke 20 on the connector fixing portion side. The plate 28 is fixed by caulking by punching of the yoke 20 or welding. The yoke 20 has an inner cylinder portion 25 that is coaxial with the outer cylinder portion 24. The inner cylinder portion 25 extends from the end portion of the yoke 20 on the connector fixing portion side toward the seat fixing portion 13 by a predetermined length, and is inserted into the end portion of the bobbin 15 on the connector fixing portion side.
[0016]
The core 21 is formed of a magnetic material in a substantially cylindrical shape, and the cylindrical portion 27 is coaxially fixed to the inner peripheral side of the bobbin 15 by insert molding. The cylindrical portion 27 of the core 21 and the inner cylindrical portion 25 of the yoke 20 are opposed to each other with a gap 29 in the axial direction. The cylindrical portion 27 of the core 21 includes a large-diameter inner wall 31 and a small-diameter inner wall 32 that is formed in a diameter smaller than the large-diameter inner wall 31 on the side opposite to the inner-diameter portion of the large-diameter inner wall 31 and forms a step with the large-diameter inner wall 31. Have.
[0017]
The moving core 22 as a movable member is made of a magnetic material and has a substantially cylindrical shape. The moving core 22 is coaxially accommodated on the inner cylindrical portion 25 of the yoke 20 and the inner peripheral side of the bobbin 15 and can reciprocate in both axial directions. A side gap (not shown) is formed between the outer peripheral wall of the moving core 22 and the inner peripheral wall of the inner cylinder portion 25. The moving core 22 has one end facing the core 21 and facing or abutting the shaft 40, and the other end facing or abutting the plate 28. A taper portion 33 whose outer diameter decreases as it approaches the core 21 is formed at the core side end of the moving core 22. A concave portion 34 that is recessed in a shape corresponding to the tapered portion 33 is formed at the moving core side end portion of the core 21. A part of the end surface of the moving core 22 on the core side is recessed to form a groove 35. The gap 30 (see FIG. 3) formed between the moving core 22 and the plate 28 is the gap formed between the inner hole of the moving core 22, the concave groove 35 and the end surface of the shaft 40, and the tapered portion 33. The gap 29 is communicated with the gap 29 through a gap formed between the concave portion 34 and the recess 34. Thereby, the magnetic attraction operation of the moving core 22 is not hindered.
[0018]
The coil 23 is wound around the outer periphery of the bobbin 15 and is disposed between the bobbin 15 and the outer cylindrical portion 24 of the yoke 20. As a result, the bobbin 15 surrounds the outer periphery of the inner cylindrical portion 25, the moving core 22, and the core 21 of the yoke 20. The connector 38 is formed of a resin material and is fixed to the protruding end portion of the connector fixing portion 14 and the plate 28. The coil 23 is electrically connected to a terminal 39 fixed to the connector fixing portion 14 by molding and a terminal 37 fixed to the connector fixing portion 14 by press fitting or the like. When a current is supplied to the coil 23 through the terminal 39, a magnetic flux is generated in the magnetic circuit constituted by the yoke 20, the moving core 22, and the core 21, and a magnetic attractive force acts between the moving core 22 and the core 21. Then, the moving core 22 moves toward the core 21, that is, leftward in FIG.
[0019]
The shaft 40 is made of a nonmagnetic material and is formed in a substantially cylindrical shape. The shaft 40 is coaxially accommodated on the inner peripheral side of the core 21 and the seat fixing portion 13, and can reciprocate on both sides in the axial direction. The shaft 40 includes a first sliding part 41, a second sliding part 42, a relay part 43, and a contact part 44. The first sliding portion 41 extends with a predetermined diameter and is fitted to the large-diameter inner wall 31 of the core 21 so as to be slidable. The moving core side end portion of the first sliding portion 41 can abut on the moving core 22. The second sliding portion 42 is connected to the end of the first sliding portion 41 on the side opposite to the moving core, extends to a smaller diameter than the first sliding portion 41, and forms a step with the first sliding portion 41. . The second sliding portion 42 is fitted to the small diameter inner wall 32 of the core 21 so as to be slidable. A compression coil spring 45 is interposed between the step of the shaft 40 and the step of the inner peripheral wall of the core 21. The compression coil spring 45 urges the shaft 40 toward the moving core 22, that is, rightward in FIGS. 2 and 3. The relay part 43 is connected to the end of the second sliding part 42 opposite to the first sliding part and extends to a smaller diameter than the second sliding part 42. The contact part 44 is connected to the end of the relay part 43 on the side opposite to the second sliding part and extends to a smaller diameter than the relay part 43. The end portion of the contact portion 44 on the side opposite to the relay portion enters the inner hole 71 of the first sheet portion 51 of the sheet member 50 and can contact the ball member 58.
[0020]
As shown in FIGS. 1 to 3, the sheet member 50 has a substantially cylindrical first sheet part 51, second sheet part 52, guide part 54, and connection part 55 on the same axis. The first sheet portion 51 faces the second sheet portion 52 with the guide portion 54 and the connection portion 55 interposed therebetween in the axial direction. As shown in FIG. 1, the second sheet portion 52, the guide portion 54, and the connection portion 55 are separated by a virtual plane S represented by a two-dot chain line perpendicular to the central axis A. A fluid passage 56 is formed by the inner holes of the first sheet portion 51, the second sheet portion 52, the guide portion 54, and the connection portion 55. A ball member 58 as a valve member is accommodated in the fluid passage 56 between the first seat portion 51 and the second seat portion 52. The sheet member 50 is coaxially disposed on the inner peripheral side of the sheet fixing portion 13 so that the first sheet portion 51 is closer to the input port 16 than the second sheet portion 52.
[0021]
The 1st sheet | seat part 51 is formed with metal materials, such as stainless steel. The one end portion 67 of the first sheet portion 51 faces the one end portion 68 of the second sheet portion 52 with a space therebetween. The ball member 58 can be seated on a portion of the opposing end portion 67 of the first seat portion 51 that faces the second seat portion 52 that is the edge of the end portion on the side opposite to the large-diameter inner peripheral wall of the small-diameter inner peripheral wall 61 described later. A single valve seat 63 is provided.
[0022]
The first sheet portion 51 has a small-diameter inner peripheral wall 61 and a large-diameter inner peripheral wall that is formed on the side opposite to the second sheet portion of the small-diameter inner peripheral wall 61 and has a larger diameter than the small-diameter inner peripheral wall 61. 62. The inner hole 71 of the first sheet portion 51 forming the fluid passage 56 opens to the outer wall of the sheet member 50 on the side opposite to the inner peripheral wall of the portion surrounded by the large inner diameter wall 62 and communicates with the drain port 18. . The shaft 40 enters the inner hole 71 of the first sheet portion 51.
[0023]
The radial dimension of the small-diameter inner peripheral wall 61 from the central axis A is constant in the circumferential direction, and is slightly smaller in the axial direction at the end portion on the side opposite to the large-diameter inner peripheral wall than on the end portion on the large-diameter inner peripheral wall side. The diameter is set according to the radial dimension of the ball member 58 seated on the first valve seat 63 at the end on the side opposite to the inner diameter of the inner diameter.
[0024]
The large-diameter inner peripheral wall 62 has two inner peripheral flat surfaces 80 extending from the end portion on the side opposite to the small-diameter inner peripheral wall toward the small-diameter inner peripheral wall 61 with a predetermined width. The inner peripheral flat surfaces 80 and 80 are formed in a so-called two-plane width configuration that faces each other in parallel with the central axis A interposed therebetween. Each of the inner peripheral flat surfaces 80, 80 is formed such that the distance from the central axis A becomes longer as it goes from the central portion in the width direction to both ends. That is, in the large-diameter inner peripheral wall 62, the radial dimension from the central axis A changes in the circumferential direction in the portion where the inner peripheral flat surfaces 80 and 80 are formed. The inner peripheral flat surfaces 80, 80 constitute the “change portion” and “flat surface” recited in the claims.
[0025]
Incidentally, the radial dimension of the large-diameter inner peripheral wall 62 in the portion where the inner peripheral flat surfaces 80 and 80 are formed is constant in the axial direction or in the axial direction from the end portion on the side opposite to the small-diameter inner peripheral wall toward the small-diameter inner peripheral wall 61 side. It is set so as to become smaller. However, the radial dimension at the portion where the inner peripheral flat surfaces 80 and 80 are formed is larger than the radial dimension of the small-diameter inner peripheral wall 61 at the end on the large diameter inner peripheral wall side at an arbitrary position on the inner peripheral flat surfaces 80 and 80. However, it can also be set so that a part of the inner peripheral flat surfaces 80, 80 is equal to or less than the radial dimension of the end portion on the large diameter inner peripheral wall side of the small diameter inner peripheral wall 61. The radial dimension of the portion of the large-diameter inner peripheral wall 62 excluding the inner peripheral flat surfaces 80 and 80 is a constant value larger than the radial dimension of the end portion on the large-diameter inner peripheral wall side of the small-diameter inner peripheral wall 61 in the circumferential direction and the axial direction. Alternatively, it is larger than the radial dimension of the end portion on the large-diameter inner peripheral wall side of the small-diameter inner peripheral wall 61 and is constant in the circumferential direction, but becomes smaller in the axial direction from the end portion on the anti-small-diameter inner peripheral wall side toward the small-diameter inner peripheral wall 61 side. Is set to be
[0026]
The first sheet portion 51 includes a small-diameter outer peripheral wall 65 formed on the outer peripheral side of the small-diameter inner peripheral wall 61, and a small-diameter outer peripheral wall 65 formed on the outer peripheral side of the large-diameter inner peripheral wall 62 and having a larger diameter than the small-diameter outer peripheral wall 65. A large-diameter outer peripheral wall 66 that forms a step. The large-diameter outer peripheral wall 66 has two outer peripheral flat surfaces 82 having the same configuration as the inner peripheral flat surface 80 at two locations in the circumferential direction corresponding to the inner peripheral flat surfaces 80 and 80.
[0027]
The second sheet portion 52 is made of a metal material such as stainless steel and is formed separately from the first sheet portion 51. A second valve seat 64 on which the ball member 58 can be seated is provided at an opposing end portion 68 of the second seat portion 52 facing the first seat portion 51. In the second sheet portion 52, an inner hole 72 that forms a fluid passage 56 is communicated with the input port 16.
[0028]
The connecting portion 55 is formed coaxially with the second sheet portion 52. The connecting portion 55 extends from the facing end portion 68 of the second sheet portion 52 toward the first sheet portion 51 side. The extending end portion of the connecting portion 55 is fitted to the outside of the small-diameter outer peripheral wall 65 of the first sheet portion 51, whereby the second sheet portion 52 is connected to the first sheet portion 51. In the connecting portion 55, a through hole 74 that penetrates the side wall portion and forms the fluid passage 56 is provided at a position corresponding to the output port 17.
[0029]
The guide portion 54 is formed coaxially with the second sheet portion 52 on the inner peripheral side of the connection portion 55. The guide portion 54 extends from the opposed end portion 68 of the second sheet portion 52 toward the first sheet portion 51 side. As shown in FIG. 1, the inner peripheral surface 90 of the guide portion 54 has a center O of the ball member 58 seated on the end surface of the opposing end portion 68 of the second seat portion 52 and the first valve seat 63 of the first seat portion 51. Distance L from _O The distance L between the end surface of the opposed end portion 68 of the second sheet portion 52 and the end surface of the opposed end portion 67 of the first sheet portion 51 is longer. _d Shorter length L _g It is stretched at. A ball member 58 is accommodated on the inner peripheral side of the guide portion 54 and the connecting portion 55 so as to be capable of reciprocating in the axial direction. The ball member 58 is slidably contacted with the inner peripheral surface 90 of the guide portion 54, thereby being guided on both sides in the axial direction of the guide portion 54, that is, on both sides in the opposing direction of the two seat portions 51 and 52. Since the extending length of the inner peripheral surface 90 is set as described above, the ball member 58 is reliably guided along the inner peripheral surface 90 between the first valve seat 63 and the second valve seat 64. The inner peripheral surface 90 of the guide portion 54 constitutes a “guide surface” recited in the claims, and the inner peripheral surface 90 is hereinafter referred to as a guide surface 90.
[0030]
In the guide portion 54, a slit 75 is formed at a position corresponding to the through hole 74 of the connection portion 55 by cutting out the side wall portion thereof to form the fluid passage 56. As a result, the slit 75 and the through hole 74 communicate with the output port 17. The slit 75 and the through hole 74 constitute the “communication hole” described in the claims.
[0031]
The ball member 58 is seated on the first valve seat 63 of the seat member 50 as shown in FIGS. 1 and 2, so that the inner hole 71 of the first seat portion 51 and other portions of the fluid passage 56 communicate with each other. Shut off. Further, the ball member 58 is seated on the second valve seat 64 of the seat member 50 as shown in FIG. 3, thereby blocking communication between the inner hole 72 of the second seat portion 52 and other portions of the fluid passage 56. To do.
[0032]
Next, the manufacturing procedure of the electromagnetic valve device 10 will be described.
(1) After the ball member 58 is accommodated on the inner peripheral side of the guide portion 54 and the connection portion 55, the second sheet portion 52 is connected to the first sheet portion 51 via the connection portion 55 to form the sheet member 50. .
(2) The sheet member 50, the core 21 and the terminal 39 are placed in the cavity of the resin mold and the cavity is filled with a resin material, whereby the sheet member 50, the core 21 and the terminal 39 are insert-molded into the base member 12. Fix it. Further, the terminal 37 is fixed to the connector fixing portion 14 of the base member 12 by press fitting or the like.
[0033]
(3) After winding the coil 23 around the bobbin 15 of the base member 12, the ends of the coil 23 are fixed to the terminal 39 and the terminal 37 by fusing.
(4) The compression coil spring 45 and the shaft 40 are inserted into the inner peripheral side of the core 21.
(5) The plate 28 is joined to one end of the yoke 20 by caulking or welding by punching out the yoke 20.
[0034]
(6) The moving core 22 is inserted into the inner cylinder part 25 of the yoke 20, and the bobbin 15 and the coil 23 are inserted into the outer cylinder part 24 of the yoke 20 while the inner cylinder part 25 is inserted into the connector fixing part side end of the bobbin 15. Is interpolated. Thereafter, the end of the yoke 20 on the side opposite to the plate is caulked and fixed to the flange portion 26 of the core 21.
(7) The terminal 39 is bent into a predetermined shape.
(8) The connector 38 is fixed to the connector fixing portion 14 and the plate 28.
[0035]
By the way, the resin mold used at the time of insert molding of the above (2) can be fitted inside the large-diameter inner peripheral wall 62 of the sheet member 50 as shown in FIG. A columnar pin 100 capable of abutting 80 is provided. In the seat member 50, the radial dimension of the large-diameter inner peripheral wall 62 is set larger than the small-diameter inner peripheral wall 61 whose radius dimension is determined in accordance with the size of the ball member 58. Therefore, a relatively large space is formed inside the large-diameter inner peripheral wall 62. Is formed. Therefore, since the cross-sectional area of the pin 100 fitted to the large diameter inner peripheral wall 62 can be set large, the strength of the pin 100 can be sufficiently ensured.
[0036]
In the state where the pin 100 of the resin molding die is fitted to the large-diameter inner peripheral wall 62 and brought into contact with the inner peripheral flat surfaces 80, 80, the rotational force for rotating the sheet member 50 to one side around the central axis A is Since the outer peripheral wall of the pin 100 is pressed in the vicinity of one end in the width direction of the inner peripheral flat surfaces 80, 80, the reaction is counteracted by the force applied from the pin 100 to each inner peripheral flat surface 80, 80. Further, the rotational force that rotates the sheet member 50 to the other side around the central axis A presses the outer peripheral wall of the pin 100 in the vicinity of the other end in the width direction of each inner peripheral flat surface 80, 80. 100 is canceled by the force applied to each inner flat surface 80, 80 from 100. Therefore, if the pin 100 is fitted to the large-diameter inner peripheral wall 62 and insert molding is performed, the sheet member 50 is prevented from rotating in the circumferential direction, so that the through hole 74 and the slit 75 are formed in the output port 17 of the base member 12. Accurate alignment and communication. In the present embodiment, since the sheet member 50 is prevented from being rotated by the two inner peripheral flat surfaces 80, 80, the sheet member 50 can be positioned with high accuracy. Further, since the anti-rotation function of the sheet member 50 is realized with a simple configuration of the flat surface 80, the sheet member 50 (first sheet portion 51) can be formed easily and inexpensively.
[0037]
The seat member 50 of the present embodiment is configured by a plurality of members and accommodates the ball member 58, but the space (inner hole) surrounded by the large-diameter inner peripheral wall 62 into which the pin 100 of the resin molding die is fitted. ) Is opened in the outer wall of the seat member 50 on the inner peripheral wall side of the small diameter, so that the plurality of members and the ball member 58 can be assembled prior to insert molding. Therefore, workability is improved as compared with the case where the remaining members are assembled to a part of the sheet member 50 fixed to the base member 12 by insert molding.
Further, since the sheet member 50 of the present embodiment is provided with two flat surfaces 82, 82 on the large-diameter outer peripheral wall 66, for example, a plate-like member that covers the through-hole 74 from the outside during insert molding is formed on the flat surface 82, 82. By making it abut against 82, the inflow of the resin material from the through hole 74 can be prevented.
[0038]
In the electromagnetic valve device 10 manufactured as described above, two outer peripheral flat surfaces 82 and 82 are provided on the large-diameter outer peripheral wall 66, and the inner peripheral wall of the base member 12 is in close contact with the outer peripheral flat surfaces 82 and 82. Therefore, the rotational force that presses the inner peripheral wall of the base member 12 with the outer peripheral flat surfaces 82 and 82 is canceled out by the reaction force based on the same principle as when the outer peripheral wall of the pin 100 is brought into contact with the inner peripheral flat surfaces 80 and 80. It is. Accordingly, rotation of the sheet member 50 to both sides in the circumferential direction due to use is prevented.
[0039]
Next, the operation of the electromagnetic valve device 10 will be described.
In a state in which the power supply to the coil 23 is cut off, as shown in FIG. 2, the shaft 40 is urged to the right in the figure by the compression coil spring 45, and the moving core 22 in contact with the shaft 40 is shown in FIG. It is brought into contact with the push plate 28 in the right direction. At this time, the ball member 58 is separated from the second valve seat 64 by the pressure of the fluid supplied from the input port 16 and is seated on the first valve seat 63. As a result, the input port 16 and the output port 17 communicate with each other through the fluid passage 56, while the communication between the input port 16, the output port 17, and the drain port 18 is blocked. The fluid flowing in from the input port 16 flows out from the output port 17 and flows into a member connected to the output port 17 with a predetermined fluid pressure.
[0040]
When a current is supplied to the coil 23, a magnetic attractive force is generated between the moving core 22 and the core 21, and the moving core 22 and the shaft 40 resist the urging force of the compression coil spring 45 by the magnetic attractive force. From the state shown in FIG. At this time, the contact portion 44 of the shaft 40 enters the inner hole 71 of the first seat portion 51 and contacts the ball member 58 to move the ball member 58 leftward in FIG. Thereby, as shown in FIG. 3, the ball member 58 is separated from the first valve seat 63 and is seated on the second valve seat 64. As a result, the output port 17 and the drain port 18 communicate with each other through the fluid passage 56, while the communication between the output port 17, the drain port 18 and the input port 16 is blocked. Since the fluid is discharged from the output port 17 to the drain port 18 side, the fluid pressure applied to the member connected to the output port 17 is reduced.
[0041]
In the electromagnetic valve device 10 described above, since the through hole 74 and the slit 75 are accurately communicated with the output port 17 of the base member 12, the opening and closing of the fluid passage 56 can be controlled with high accuracy.
Further, the guide surface 90 provided on the seat member 50 of the electromagnetic valve device 10 includes a first sheet portion 51 in which the inner hole 71 communicates with the drain port 18 from the second sheet portion 52 in which the inner hole 72 communicates with the input port 16. It extends | stretches in the length which does not reach the 1st sheet | seat part 51 toward the side. Therefore, when the ball member 58 is separated from the second valve seat 64 of the second seat portion 52, the flow resistance that the low temperature fluid receives from the guide surface 90 continuously extends between the two seat portions 51 and 52. This is reduced compared to the case where a guide surface is provided. Therefore, the flow rate of the fluid discharged from the output port 17 to the drain port 18 side can be controlled to a desired amount regardless of the temperature, thereby improving the fluid flow response.
[0042]
In the embodiment described above, as shown in FIG. 1, two flat surfaces 80 as changing portions are provided on the large-diameter inner peripheral wall 62 of the sheet member 50, but for example, as shown in FIG. The large-diameter inner peripheral wall 62 ′ may be formed in a so-called D-cut shape having only one flat surface 80, or the large-diameter inner peripheral wall may be formed so as to have three or more flat surfaces.
In the above embodiment, the changing portion is realized by the flat surface 80 that changes the radial dimension from the central axis A in the circumferential direction. However, the changing portion is changed by the flat surface that changes the radial dimension from the central axis in the radial direction. It may be realized. In addition, the changing portion may be realized by a curved surface such as an elliptical curved surface that changes the radial dimension from the central axis in the circumferential direction, and in that case, a necessary number of curved surfaces can be formed.
[0043]
Further, in the above-described embodiment, the sheet member 50 having the two sheet portions 51 and 52 is provided with a small-diameter inner peripheral wall 61 and a large-diameter inner peripheral wall 62 in one of the sheet portions 51, Although the valve seat 63 is provided at the peripheral wall side end, for example, a small diameter inner peripheral wall and a large diameter inner peripheral wall are provided in a sheet member made of one cylindrical sheet portion, and the anti-large diameter inner peripheral wall side end of the small diameter inner peripheral wall is provided. Alternatively, a valve seat may be provided on at least one of the large-diameter inner peripheral wall side end.
[0044]
Further, in the above-described embodiment, the other sheet portion 51 has an inner hole 72 from one sheet portion 52 communicating with the input port 16 toward the other sheet portion 51 side where the inner hole 71 communicates with the drain port 18. The guide surface 90 was extended with a length that did not reach, but conversely, from one sheet portion in which the inner hole communicates with the drain port, toward the other sheet portion side in which the inner hole communicates with the input port The guide surface may be extended with a length that does not reach the other sheet portion. Also, the guide extends from the position separated from the end of one sheet part to the other sheet part side, starting from the origin position to the other sheet part side, with a length that does not reach the other sheet part. A surface may be formed.
[0045]
Further, in the above-described embodiment, the substantially cylindrical guide portion 54 is provided in the sheet member 50. However, a plurality of guide portions each extending between the two seat portions and spaced apart from each other around the ball member. May be provided on the sheet member 50.
Further, in the above embodiment, the present invention is applied to a normally open type three-way solenoid valve device. However, the present invention may be applied to a normally closed type three-way solenoid valve device, or the present invention may be applied to a two-way solenoid valve device. The invention may be applied.
[Brief description of the drawings]
1A and 1B are views showing a sheet member according to an embodiment of the present invention, in which FIG. 1A is a plan view and FIG. 1B is a schematic view corresponding to a BB cross section in FIG.
FIG. 2 is a cross-sectional view showing an operating state of a solenoid valve device according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view showing another operating state of the electromagnetic valve device according to one embodiment of the present invention.
4A and 4B are views showing a state in which pins of a resin mold are inserted into the sheet member shown in FIG. 1, wherein FIG. 4A corresponds to a cross-sectional view, and FIG. 4B corresponds to a BB cross section in FIG. It is a schematic diagram.
FIG. 5 is a plan view showing a modification of the sheet member shown in FIG.
[Explanation of symbols]
10 Solenoid valve device
12 Base member
13 Seat fixing part
16 Input port
17 Output port
18 Drain port
22 Moving core (movable member)
23 Coil
40 shaft
50 Sheet material
51 First sheet part
52 Second sheet part
54 Guide
56 Fluid passage
58 Ball member
61 Small diameter inner wall
62, 62 'Large diameter inner wall
63 1st valve seat
64 Second valve seat
67 Opposite end of first sheet
68 Opposite end of second sheet
71 Inner hole of first sheet part
72 Inner hole of second sheet part
74 Through hole (communication hole)
75 slit (communication hole)
80 Inner flat surface (flat surface)
90 Inner peripheral surface (guide surface)
100 pins
A Center axis
O center

Claims

A resin base member forming an opening through which fluid can pass;
A cylindrical seat member having a valve seat, fixed in the base member by insert molding, and forming a fluid passage communicating with the opening;
A valve member that blocks the fluid passage by being seated on the valve seat and opens the fluid passage by being separated from the valve seat;
A movable member that moves the valve member by reciprocating; and
A coil that generates a magnetic attraction force for driving the movable member by energization;
A solenoid valve device comprising:
The sheet member has a small-diameter inner peripheral wall, and a large-diameter inner peripheral wall that is formed on one side in the axial direction of the small-diameter inner peripheral wall to have a larger diameter than the small-diameter inner peripheral wall and forms a step with the small-diameter inner peripheral wall. ,
An inner hole surrounded by the small-diameter inner peripheral wall and the large-diameter inner peripheral wall forms the fluid passage, and opens to the outer wall of the sheet member on the anti-small-diameter inner peripheral wall side of the portion surrounded by the large-diameter inner peripheral wall.
The valve seat is provided on at least one of an anti-large-diameter inner peripheral wall side end and a large-diameter inner peripheral wall-side end of the small-diameter inner peripheral wall,
The large-diameter inner peripheral wall has a changing portion in which a radial dimension from a central axis changes.

2. The electromagnetic wave according to claim 1, wherein the changing portion is configured by a flat surface extending at a predetermined width from an end portion of the large-diameter inner peripheral wall on a side opposite to the small-diameter inner peripheral wall toward the small-diameter inner peripheral wall. Valve device.

3. The solenoid valve device according to claim 1, wherein the large-diameter inner peripheral wall has the two flat surfaces parallel to each other across a central axis.

The valve member is composed of a ball member,
The sheet member includes two cylindrical sheet portions whose end portions are opposed to each other with the ball member interposed therebetween, and a guide portion having a guide surface, the ball member being in sliding contact with the guide surface. A guide portion that guides the opposite sides of the seat portion,
The valve seat is provided at each opposing end of the two seat parts,
Either or both of the two seat portions have the small diameter inner peripheral wall and the large diameter inner peripheral wall,
The said guide surface extends | stretches between the said 2 sheet | seat parts, The extending | stretching length is set shorter than the space | interval between the said 2 sheet | seat parts, The Claim 1, 2, or 3 characterized by the above-mentioned. Solenoid valve device.

The guide surface extends from one of the two seat portions toward the other side, and the length of the guide surface is the center of the ball member seated on the one seat portion and the valve seat of the other seat portion. 5. The electromagnetic valve device according to claim 4, wherein the electromagnetic valve device is set to be longer than a separation distance between the two seat portions and shorter than an interval between the two seat portions.

The base member forms an output port, an input port and a drain port as the opening,
The sheet member has a communication hole communicating between the inside and the outside between the two sheet portions, the communication hole is communicated with the output port, and the inner hole of the one sheet portion is communicated with the input port. , Communicating the inner hole of the other sheet portion with the drain port,
6. The electromagnetic valve device according to claim 5, wherein each of the communication hole and each inner hole of the two seat portions forms the fluid passage.