JP3709792B2

JP3709792B2 - Solenoid valve device

Info

Publication number: JP3709792B2
Application number: JP2001004890A
Authority: JP
Inventors: 英樹奥田; 史佳村上
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 2001-01-12
Filing date: 2001-01-12
Publication date: 2005-10-26
Anticipated expiration: 2021-01-12
Also published as: JP2002206658A

Description

【０００１】
【発明の属する技術分野】
本発明は、流体流路を開閉する電磁弁装置に関するものである。
【０００２】
【従来の技術】
流体流路を開閉する電磁弁装置として、可動コアと、可動コアの往復移動方向で可動コアと向き合う固定コアと、可動コアの外周側に配置されるコアプレートとにより磁気回路を構成し、コイルに通電することにより固定コア側に可動コアを吸引するものが知られている。コイルへの通電をオンまたはオフすることにより可動コアとともに可動部材を構成する弁部材が弁座から離座または弁座に着座するので、流体流路が開閉される。
そして、固定コアおよびコアプレートをインサート成形する樹脂材でコアプレートの内周側に樹脂膜を形成し、この樹脂膜で可動コアの外周壁を往復移動可能に案内することがある。
【０００３】
【発明が解決しようとする謀題】
しかしながら、コアプレートの内周側に形成した樹脂膜により可動コアの外周壁を往復移動可能に案内する構成では、可動コアとコアプレートとの間に径方向に少なくとも樹脂膜の厚み分のギャップが形成されるので、固定コアに可動コアを吸引する磁気吸引力が低下する。所望の磁気吸引力を発生するためにコイルの巻数を増やすと、コイルが大型化するという問題がある。
【０００４】
また、可動コアを吸引する磁気吸引力は、可動コアと固定コアとの間に軸方向に形成される軸ギャップが小さくなると大きくなる。したがって、可動コアと固定コアとの軸ギャップが最大になるコイルへの非通電時において所望の磁気吸引力を得るためには、可動コアを吸引する力が小さい場合、可動コアと固定コアとの間に形成される軸方向の最大ギャップを小さくし磁気吸引力を増加させなければならない。しかし、最大ギャップを小さくすると、可動コアが固定コアに吸引されストッパに衝突するときの軸方向の最小ギャップが小さくなる。可動コアが固定コアに接近し軸ギャップが小さくなるにつれ磁気吸引力は急激に増加するので、最小ギャップが小さくなると可動コアがストッパに衝突するときの速度が上昇し、可動コアが大きくバウンドする。開弁時間が短い場合、可動コアが大きくバウンドすると、流体流量がばらつくとともに、開弁時間と流体流量とが線形関係を満たさなくなるという問題がある。
本発明の目的は、流体流量が少ない場合の流体流量のばらつきを防止し、小型化可能な電磁弁装置を提供することにある。
【０００５】
【課題を解決するための手段】
本発明の請求項１記載の電磁弁装置によると、第１固定コアの可動コアと向き合う側に配設され、非磁性材で形成されている案内部材が可動コアの内周壁を往復移動可能に案内している。したがって、可動コアの外周側に配置されている第２固定コアと可動コアの外周壁との間に非磁性の案内部材を配置する必要がない。可動コアと第２固定コアとの間に径方向に形成されるギャップを極力小さくし、第１固定コアに可動コアを吸引する磁気吸引力を増加できるので、コイルの巻数を減少し、電磁弁を小型化できる。
【０００６】
また、コイルの巻数を減少しない場合、可動コアを吸引する磁気吸引力が増加するので、コイルへの非通電における第１固定コアと可動コアとの最大ギャップと、可動部材がストッパに衝突するときの第１固定コアと可動コアとの最小ギャップとを大きくすることができる。したがって、可動コアを軸方向に吸引する磁気吸引力が大きくなり過ぎない位置を最小ギャップにすることができる。したがって、可動コアがストッパに衝突するときの速度を低下させ、ストッパに衝突するときの可動コアのバウンドを小さくすることができる。これにより、開弁時間が短く流体流量が少ないときにおいても流体流量のばらつきが小さくなる。さらに、可動コアのバウンドが小さくなると流路の開口面積の減少を防止できるので、流体流量が少ないときにおいても開弁時間と流体流量との線形関係を保持できる。
さらに、第１固定コアの端部は、大径部と、大径部の可動コア側に配置されている小径部とを有している。そして、小径部の外径をｒ１、案内部材の外径をｒ２、可動コアの内径をｒ３とすると、ｒ３＞ｒ２＞ｒ１である。ｒ２＞ｒ１を保持しつつｒ１とｒ２とを極力近づけることにより、可動コアが第１固定コアに吸引され小径部に近づくにつれ、可動コアの内周壁と小径部の外周壁との間で可動コアを径方向に吸引する力が大きくなる。可動コアと第１固定コアとの軸ギャップが小さくなっても可動コアを軸方向に吸引する磁気吸引力の増加を低減できるので、可動部材がストッパに衝突する速度が低下し、可動部材がストッパに衝突するときのバウンドが小さくなる。したがって、開弁時間が短く流体流量が少ないときの流体流量のばらつきを低減できる。さらに、可動コアのバウンドが小さくなると流路の開口面積の減少を防止できるので、流体流量が少ないときにおいても開弁時間と流体流量との線形関係を保持できる。
【０００７】
本発明の請求項２記載の電磁弁装置によると、可動コアが第１固定コア側に吸引され小径部の先端部を通過すると、可動コアと先端部との間に第１固定コア側に可動コアを吸引する磁気吸引力と反対方向に磁気吸引力が働く。可動部材がストッパに衝突する速度が減速し、可動部材がストッパに衝突するときのバウンドが小さくなる。したがって、開弁時間が短く流体流量が少ないときの流体流量のばらつきを低減できる。さらに、可動コアのバウンドが小さくなると流路の開口面積の減少を防止できるので、流体流量が少ないときにおいても開弁時間と流体流量との線形関係を保持できる。
本発明の請求項３記載の電磁弁装置によると、可動コアと向き合う第１固定コアの端部は、可動コアが侵入可能な空間を形成している収容部を有している。収容部の内径をｒ１、案内部材の外径をｒ２、可動コアの内径をｒ３、可動コアの外径をｒ４とすると、ｒ１＞ｒ４＞ｒ３＞ｒ２である。ｒ１＞ｒ４を保持しつつｒ１とｒ４とを極力近づけることにより、可動コアが第１固定コアに近づくにつれ、可動コアの外周壁と収容部の内周壁との間で可動コアを径方向に吸引する磁気吸引力が大きくなる。可動コアと第１固定コアとの軸ギャップが小さくなっても可動コアを軸方向に吸引する磁気吸引力の増加を低減できるので、可動部材がストッパに衝突する速度が減速し、可動部材がストッパに衝突するときのバウンドが小さくなる。したがって、開弁時間が短く流体流量が少ないときの流体流量のばらつきを低減できる。さらに、可動コアのバウンドが小さくなると流路の開口面積の減少を防止できるので、流体流量が少ないときにおいても開弁時間と流体流量との線形関係を保持できる。
本発明の請求項４記載の電磁弁装置によると、可動コアの内周壁を案内する案内部材が可動部材のストッパを兼ねているので、部品点数が減少し、組付け工数が低減する。
本発明の請求項５記載の電磁弁装置によると、第１固定コア、第２固定コアおよびコイル部をインサート成形する樹脂材で案内部材を成形するので、部品点数が減少し、組付け工数が低減する。
【００１２】
本発明の請求項６記載の電磁弁装置の製造方法によると、第１固定コア、第２固定コア、コイル部および可動コアの型材をインサート成形する樹脂材で案内部材を成形するので、部品点数が減少し、組付工数が低減する。
本発明の請求項７記載の電磁弁装置の製造方法によると、第１固定コア、第２固定コア、コイル部および可動コアの型材をインサート成形する樹脂材で案内部材および可動部材のストッパを成形するので、部品点数が減少し、組付工数が低減する。
【００１３】
【発明の実施の形態】
以下、本発明の実施の形態を示す複数の実施例を図に基づいて説明する。
（第１実施例）
本発明の第１実施例による電磁弁装置を図１および図２に示す。電磁弁装置１０は、例えば自動車の燃料タンクで発生する蒸発燃料をエンジンへ送り出すシステムに用いられ、蒸発燃料の流路を開閉する弁装置である。
【００１４】
図１に示す電磁弁装置１０の第１固定コアとしての固定コア１１は円筒状に形成されており、固定コア１１の一端にヨーク１２がかしめ固定されている。第２固定コアとしてのコアプレート１３は固定コア１１の他端側でヨーク１２と接続している。固定コア１１、ヨーク１２およびコアプレート１３は磁性材で形成されている。コイル２１を巻回したボビン２０は固定コア１１の外周にヨーク１２とコアプレート１３とで挟持するように配設されている。ボビン２０およびコイル２１はコイル部を構成している。
【００１５】
充填樹脂３０は、固定コア１１、ヨーク１２、コアプレート１３、ボビン２０およびコイル２１をインサート成形している。充填樹脂３０は、コネクタ３１および案内部材３５を成形している。ターミナル３２は、コネクタ３１内に埋設されており、コイル２１と電気的に接続している。案内部材３５は、固定コア１１の内側を充填するとともに、後述する弁部材４１側に突出するように成形されている。案内部材３５は可動コア４０の内周壁を往復移動可能に案内している。
【００１６】
可動コア４０、弁部材４１および板ばね４２は可動部材を構成し、一体になって往復移動する。可動コア４０は磁性材で円筒状に形成されており、コアプレート１３の内周側に配設されている。可動コア４０は円板状の板ばね４２に溶接等で固定されている。ゴム製の弁部材４１は板ばね４２に嵌合している。板ばね４２の外周部は充填樹脂３０と流路部材５０とに挟持されている。コイルスプリング４３は一端を板ばね４２に当接し、他端を案内部材３５に当接している。コイルスプリング４３は流路部材５０に形成されている弁座５３に向けて板ばね４２を付勢している。
【００１７】
流路部材５０は充填樹脂３０と結合している。流路部材５０には吸入口５１および排出口５２が一体に形成されている。弁部材４１が弁座５３から離座すると、吸入口５１の吸入流路１００から流入した流体が排出口５２の排出流路１０１から排出される。吸入流路１００および排出流路１０１は特許請求の範囲に記載した「流体流路」を構成している。
【００１８】
次に、固定コア１１および案内部材３５の構造を詳細に説明する。
図２に示すように、固定コア１１の弁部材４１側端部は、大径部１１ａと、大径部１１ａよりも弁部材４１側に配置され大径部１１ａよりも小径の小径部１１ｂとを有している。大径部１１ａと小径部１１ｂとの間に段差１１ｃが形成されている。案内部材３５は、大径部１１ａよりも小径で小径部１１ｂよりも大径の案内部３６と、案内部３６から弁部材４１側に向けて突出し案内部３６よりも小径のストッパ３７とを有している。案内部３６は小径部１１ｂの外周を覆っている。ストッパ３７は、可動コア４０が第１固定コア１１に吸引されるとき、弁部材４１を係止し、可動コア４０および弁部材４１の移動量を規定する。小径部１１ｂの外径をｒ１、案内部３６の外径をｒ２、可動コア４０の内径をｒ３とすると、ｒ３＞ｒ２＞ｒ１に設定されている。
【００１９】
次に、電磁弁装置１０の製造手順について説明する。
(1) 固定コア１１の一端にヨーク１２をかしめ固定する。
(2) 固定コア１１の外周かつヨーク１２の内周側にコイル２１を巻回したボビン２０を挿入する。
(3) 固定コア１１の他端側のヨーク１２にコアプレート１３を接続する。
(4) 樹脂充填後に可動コア４０を組み付けるために、可動コア４０の型材を位置決めする。
(5) 固定コア１１、ヨーク１２、コアプレート１３、コイル２１を巻回したボビン２０および型材を樹脂でインサート成形する。このとき、案内部材３５が樹脂で成形される。
(6) 型材を抜き、可動コア４０を組み付ける。
このように組み付けた構造体に流路部材５０および他の部材を組み付けて電磁弁装置１０を製造する。
【００２０】
次に電磁弁装置１０の作動について説明する。
(1) コイル２１への通電オフ時、弁部材４１はコイルスプリング４３の付勢力により弁座５３に着座している。したがって、吸入流路１００と排出流路１０１との連通は遮断され、排出流路１０１から流体は排出されない。
【００２１】
(2) コイル２１に通電すると、コイル２１が発生する磁力により可動コア４０は固定コア１１側に吸着される。可動コア４０が固定コア１１側に吸引されると、弁部材４１が弁座５３から離座する。これにより、吸入流路１００と排出流路１０１とが連通し、排出流路１０１から流体が排出される。可動コア４０および弁部材４１の移動は弁部材４１が案内部材３５のストッパ３７に係止されることにより停止する。
【００２２】
可動コア４０が固定コア１１に向けて移動し、可動コア４０の内周壁が小径部１１ｂの外周壁と重なると、可動コア４０と小径部１１ｂとの間で径方向に磁気吸引力が働く。可動コア４０と固定コア１１との間に軸方向に働く磁気吸引力は、通常固定コア１１と可動コア４０との間で軸方向に形成される軸ギャップが小さくなるにしたがい大きくなる。ここで軸ギャップとは、可動コア４０と、可動コア４０と軸方向で向き合う固定コア１１の対向部との距離を表しており、第１実施例において可動コア４０と軸方向に向き合う固定コア１１の対向部は段差１１ｃである。
【００２３】
可動コア４０が固定コア１１に近づき軸ギャップが小さくなるにしたがい、可動コア４０の内周壁と小径部１１ｂの外周壁とが径方向に向き合う対向面積が増加し、可動コア４０と小径部１１ｂとの間で径方向に働く磁気吸引力は大きくなる。したがって、図３に示すように、軸ギャップがある程度小さくなるまでの間、軸方向に働く磁気吸引力の上昇を抑え軸ギャップと磁気吸引力との特性を平坦にすることができる。
【００２４】
さらに、案内部材３５の案内部３６が可動コア４０の内周壁を往復移動可能に案内するので、充填樹脂３０を充填するとき、可動コア４０の外周側に配置されているコアプレート１３の内周壁を樹脂で覆い可動コア４０の外周壁を案内する必要がない。したがって、可動コア４０の外周壁とコアプレート１３の内周壁との間に形成されるサイドギャップｄを極力小さくすることができる。サイドギャップｄが小さくなることにより、固定コア１１が可動コア４０を吸引する磁気吸引力が大きくなる。
【００２５】
コアプレート１３の内周側を樹脂で覆い、可動コア４０の外周壁を樹脂で案内する従来の構成に比べ、図３に示すように、軸ギャップが大きいときの磁気吸引力が大きくなっているので、可動コア４０を吸引するために必要な最低磁気吸引力を満たす軸ギャップの大きさが従来例に比べ大きくなっている。コイル２１への非通電時における軸ギャップ（最大ギャップ）、ならびに弁部材４１がストッパ３７に衝突するときの軸ギャップ（最小ギャップ）を大きくし、図３に示す特性曲線において、比較的特性が平坦な範囲を可動コア４０の可動範囲にすることができる。これにより、弁部材４１がストッパ３７に衝突するときの速度が低下し、弁部材４１がストッパ３７に衝突するときのバウンドが小さくなる。したがって、開弁時間が短く、吸入流路１００から排出流路１０１へ排出される流体流量が小さい場合に、流体流量のばらつきを低減できる。さらに、弁部材４１のバウンドが小さくなると流路の開口面積の減少を防止できるので、流体流量が少ないときにおいても開弁時間と流体流量との線形関係を保持できる。
【００２６】
また、軸ギャップを従来例と同じにするなら、コイルの巻数を減らしても同等の磁気吸引力が発生する。したがって、可能な限りコイルの巻数を減らせば、電磁弁装置を小型化できる。
【００２７】
（第２実施例）
本発明の第２実施例を図４および図５に示す。第１実施例と実質的に同一構成部分には同一符号を付す。
第２実施例の第１固定コアとしての固定コア６０の弁部材４１側端部は、大径部６１と、大径部６１よりも弁部材４１側に配置され大径部６１よりも小径の小径部６２とを有している。大径部６１と小径部６２との間に段差６３が形成されている。小径部６２は、可動コア４０側の先端部６２ａよりも反可動コア側に配置され先端部６２ａよりも小径の凹部６２ｂを有している。
【００２８】
可動コア４０が固定コア６０に向けて移動し、可動コア４０の内周壁が小径部６２の先端部６２ａの外周壁と重なると、可動コア４０と先端部６２ａとの間で径方向に磁気吸引力が働く。可動コア４０がさらに第１固定コア６０側に吸引され、可動コア４０の大径部側先端部が先端部６２ａを通り過ぎると、可動コア４０の先端部と固定コア６０の先端部６２ａとの間に、可動コア４０が固定コア６０側に吸引される方向とは反対方向に磁気吸引力が働く。したがって、図３に示すように、弁部材４１がストッパ３７に衝突するときに固定コア６０と可動コア４０との間で軸方向に働く磁気吸引力が低下し、弁部材４１がストッパ３７に衝突するときの速度が低下する。したがって、ストッパ３７に衝突するときの弁部材４１のバウンドが小さくなる。第２実施例の軸ギャップは、段差６３と可動コア４０との間に形成される軸ギャップを表している。
【００２９】
（第３実施例）
本発明の第３実施例を図６に示す。第１実施例と実質的に同一構成部分には同一符号を付す。
第１固定コアとしての固定コア７０は、弁部材４１側端部に、可動コア４０が進入可能な空間７１ａを形成する収容部７１を有している。案内部材８０は、固定コア７０の内周側を充填するとともに、可動コア４０の内周壁を往復移動可能に案内する案内部８１と、案内部８１よりも弁部材４１側に突出したストッパ８２とを有している。ストッパ８２は案内部８１よりも小径である。収容部７１の内径をｒ１、案内部８１の外径をｒ２、可動コア４０の内径をｒ３、可動コア４０の外径をｒ４とすると、ｒ１＞ｒ４＞ｒ３＞ｒ２に設定されている。
【００３０】
可動コア４０が固定コア７０に向けて移動し、可動コア４０の外周壁が収容部７１の内周壁と重なると、可動コア４０と収容部７１との間で径方向に磁気吸引力が働く。可動コア４０がさらに固定コア７０側に吸引されると、可動コア４０と収容部７１との間で径方向に働く磁気吸引力が大きくなる。したがって、軸ギャップがある程度小さくなるまでの間、軸方向に働く磁気吸引力の上昇を抑え軸ギャップと磁気吸引力との特性を平坦にすることができる。第３実施例における軸ギャップは、収容部７１の底面７２と可動コア４０との間に形成される軸ギャップを表している。
【００３１】
第３実施例の構成に加え、収容部７１の弁部材４１側の先端部よりも内径が大きい凹部を収容部７１の反可動コア側に形成してもよい。可動コア４０が固定コア７０側に吸引され、可動コア４０の固定コア７０側の先端が収容部７１の先端部を通り過ぎると、可動コア４０の先端部と収容部７１の先端部との間に、可動コア４０が固定コア７０に軸方向に吸引される方向とは反対方向に磁気吸引力が働く。したがって、弁部材４１がストッパ８２に衝突するときに固定コア７０と可動コア４０との間で軸方向に働く磁気吸引力が低下し、弁部材４１がストッパ８２に衝突するときの速度が低下する。したがって、ストッパ８２に衝突するときの弁部材４１のバウンドが小さくなる。
【００３２】
以上説明した本発明の上記複数の実施例では、固定コア、コアプレートおよびコイル部をインサート成形するときに樹脂で一体成形した案内部材により、往復移動可能に可動コアの内周壁を案内している。したがって、可動コアの外周に配設されているコアプレートの内周側に可動コアを往復移動可能に案内する案内部材を配設する必要がない。可動コアとコアプレートとの間に径方向に形成されるサイドギャップを極力小さくできるので、可動コアと軸方向で向き合う固定コアに可動コアを吸引する磁気吸引力が大きくなる。したがって、コイルの巻数を低減し電磁弁装置を小型化できる。
【００３３】
磁気吸引力が増加することにより、コイル２１への非通電時において固定コアと可動コアとの間に軸方向に形成される軸ギャップを大きくしても、固定コアに可動コアを吸引するために必要な磁気吸引力を得ることができる。軸ギャップと固定コアと可動コアとの間に軸方向に働く磁気吸引力は、可動コアが固定コアに近づくにつれ、急激に増加する。そこで上記複数の実施例では、使用する軸ギャップの範囲を大きくなる方にずらすことにより、軸ギャップと固定コアと可動コアとの間に軸方向に働く磁気吸引力との特性が比較的平坦な部分を使用できる。さらに、可動コアが固定コアに近づくにしたがい、可動コアと固定コアとの間に、可動コアを径方向に吸引する力が働くので、可動コアが固定コアに近づくにしたがい可動コアを軸方向に吸引する磁気吸引力の増加が抑制される。
【００３４】
したがって、可動部材がストッパに衝突するときの速度が低下し、可動部材のバウンドが小さくなる。これにより、開弁時間が短く、吸入流路１００から排出流路１０１を通り排出される流体流量が少ないときでも、流体流量のばらつきを低減できる。さらに、弁部材４１のバウンドが小さくなると流路の開口面積の減少を防止できるので、流体流量が少ないときにおいても開弁時間と流体流量との線形関係を保持できる。
【００３５】
上記複数の実施例では、案内部材がストッパを有していたが、案内部材とストッパとを別部材にしてもよい。また、コネクタ３１を有する充填樹脂３０と案内部材とを一体に成形したが、案内部材をコネクタ３１と別体にすることも可能である。
【図面の簡単な説明】
【図１】本発明の第１実施例による電磁弁装置を示す断面図である。
【図２】図１のII線部分の拡大図である。
【図３】第１実施例、第２実施例および従来例による軸ギャップと磁気吸引力との関係を示す特性図である。
【図４】本発明の第２実施例による電磁弁装置を示す断面図である。
【図５】図４のＶ線部分の拡大図である。
【図６】本発明の第３実施例による電磁弁装置を示す断面図である。
【符号の説明】
１０電磁弁装置
１１、６０、７０固定コア（第１固定コア）
１３コアプレート（第２固定コア）
２０ボビン（コイル部)
２１コイル（コイル部）
３５、８０案内部材
３６、８１案内部
３７、８２ストッパ
４０可動コア
４１弁部材
５３弁座
６１大径部
６２小径部
６２ａ先端部
６２ｂ凹部
７１収容部
７１ａ空間
１００吸入流路（流体流路）
１０１排出流路（流体流路）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic valve device that opens and closes a fluid flow path.
[0002]
[Prior art]
As an electromagnetic valve device that opens and closes a fluid flow path, a magnetic circuit is configured by a movable core, a fixed core that faces the movable core in the reciprocating direction of the movable core, and a core plate disposed on the outer peripheral side of the movable core, and a coil It is known that the movable core is attracted to the fixed core side by energizing the coil. When the energization to the coil is turned on or off, the valve member constituting the movable member together with the movable core is separated from the valve seat or seated on the valve seat, so that the fluid flow path is opened and closed.
In some cases, a resin film is formed on the inner peripheral side of the core plate by a resin material in which the fixed core and the core plate are insert-molded, and the outer peripheral wall of the movable core is guided by the resin film so as to be reciprocally movable.
[0003]
[Conspiracy to be solved by the invention]
However, in the configuration in which the outer peripheral wall of the movable core is guided by the resin film formed on the inner peripheral side of the core plate so as to be able to reciprocate, there is at least a gap corresponding to the thickness of the resin film in the radial direction between the movable core and the core plate. As a result, the magnetic attractive force for attracting the movable core to the fixed core is reduced. When the number of turns of the coil is increased in order to generate a desired magnetic attraction force, there is a problem that the coil becomes large.
[0004]
Further, the magnetic attractive force for attracting the movable core increases as the axial gap formed in the axial direction between the movable core and the fixed core decreases. Therefore, in order to obtain a desired magnetic attraction force when the coil that maximizes the axial gap between the movable core and the fixed core is not energized, if the force for attracting the movable core is small, the movable core and the fixed core The maximum axial gap formed between them must be reduced to increase the magnetic attractive force. However, if the maximum gap is reduced, the axial minimum gap when the movable core is attracted to the fixed core and collides with the stopper is reduced. As the movable core approaches the fixed core and the axial gap decreases, the magnetic attractive force increases rapidly. Therefore, when the minimum gap decreases, the speed at which the movable core collides with the stopper increases, and the movable core greatly bounces. When the valve opening time is short, there is a problem that if the movable core bounces greatly, the fluid flow rate varies and the valve opening time and the fluid flow rate do not satisfy the linear relationship.
An object of the present invention is to provide a solenoid valve device that can prevent a variation in fluid flow rate when the fluid flow rate is small and can be miniaturized.
[0005]
[Means for Solving the Problems]
According to the electromagnetic valve device of the first aspect of the present invention, the guide member that is disposed on the side of the first fixed core that faces the movable core and is formed of a nonmagnetic material is capable of reciprocating along the inner peripheral wall of the movable core. I am guiding you. Therefore, it is not necessary to dispose a nonmagnetic guide member between the second fixed core disposed on the outer peripheral side of the movable core and the outer peripheral wall of the movable core. The gap formed in the radial direction between the movable core and the second fixed core can be made as small as possible, and the magnetic attractive force for attracting the movable core to the first fixed core can be increased. Can be miniaturized.
[0006]
Further, when the number of turns of the coil is not reduced, the magnetic attractive force for attracting the movable core increases, so that the maximum gap between the first fixed core and the movable core when the coil is not energized and the movable member collides with the stopper. The minimum gap between the first fixed core and the movable core can be increased. Therefore, the position where the magnetic attractive force for attracting the movable core in the axial direction does not become too large can be set as the minimum gap. Therefore, the speed when the movable core collides with the stopper can be reduced, and the bound of the movable core when colliding with the stopper can be reduced. Thereby, even when the valve opening time is short and the fluid flow rate is small, the variation in the fluid flow rate is reduced. Further, since the decrease in the opening area of the flow path can be prevented when the bound of the movable core is reduced, the linear relationship between the valve opening time and the fluid flow rate can be maintained even when the fluid flow rate is small.
Furthermore, the end portion of the first fixed core has a large diameter portion and a small diameter portion arranged on the movable core side of the large diameter portion. When the outer diameter of the small diameter portion is r1, the outer diameter of the guide member is r2, and the inner diameter of the movable core is r3, r3>r2> r1. By moving r1 and r2 as close as possible while holding r2> r1, the movable core is drawn between the inner peripheral wall of the movable core and the outer peripheral wall of the small diameter portion as the movable core is attracted by the first fixed core and approaches the small diameter portion. The force for sucking in the radial direction increases. Even if the axial gap between the movable core and the first fixed core is reduced, the increase in the magnetic attractive force for attracting the movable core in the axial direction can be reduced, so that the speed at which the movable member collides with the stopper decreases, and the movable member becomes the stopper. The bounce when colliding with the Therefore, variation in fluid flow rate when the valve opening time is short and the fluid flow rate is small can be reduced. Further, since the decrease in the opening area of the flow path can be prevented when the bound of the movable core is reduced, the linear relationship between the valve opening time and the fluid flow rate can be maintained even when the fluid flow rate is small.
[0007]
According to the electromagnetic valve device according to claim 2 of the present invention, when the movable core is attracted to the first fixed core side and passes through the distal end portion of the small diameter portion, the movable core moves to the first fixed core side between the movable core and the distal end portion. A magnetic attractive force acts in the opposite direction to the magnetic attractive force that attracts the core. The speed at which the movable member collides with the stopper is reduced, and the bounce when the movable member collides with the stopper is reduced. Therefore, variation in fluid flow rate when the valve opening time is short and the fluid flow rate is small can be reduced. Further, since the decrease in the opening area of the flow path can be prevented when the bound of the movable core is reduced, the linear relationship between the valve opening time and the fluid flow rate can be maintained even when the fluid flow rate is small.
According to the electromagnetic valve device of the third aspect of the present invention, the end portion of the first fixed core facing the movable core has the accommodating portion forming the space into which the movable core can enter. When the inner diameter of the housing portion is r1, the outer diameter of the guide member is r2, the inner diameter of the movable core is r3, and the outer diameter of the movable core is r4, r1>r4>r3> r2. By holding r1> r4 while bringing r1 and r4 as close as possible, as the movable core approaches the first fixed core, the movable core is sucked in the radial direction between the outer peripheral wall of the movable core and the inner peripheral wall of the housing portion. The magnetic attractive force to be increased. Even if the axial gap between the movable core and the first fixed core is reduced, the increase in magnetic attractive force for attracting the movable core in the axial direction can be reduced, so that the speed at which the movable member collides with the stopper is reduced, and the movable member becomes the stopper. The bounce when colliding with the Therefore, variation in fluid flow rate when the valve opening time is short and the fluid flow rate is small can be reduced. Further, since the decrease in the opening area of the flow path can be prevented when the bound of the movable core is reduced, the linear relationship between the valve opening time and the fluid flow rate can be maintained even when the fluid flow rate is small.
According to the electromagnetic valve device of the fourth aspect of the present invention, since the guide member for guiding the inner peripheral wall of the movable core also serves as a stopper for the movable member, the number of parts is reduced, and the assembly man-hour is reduced.
According to the solenoid valve device of the fifth aspect of the present invention, since the guide member is formed by the resin material that insert-molds the first fixed core, the second fixed core, and the coil portion, the number of parts is reduced and the assembly man-hour is reduced. To reduce.
[0012]
According to the method for manufacturing a solenoid valve device according to claim 6 of the present invention, the guide member is formed by the resin material that insert-molds the mold material of the first fixed core, the second fixed core, the coil portion, and the movable core. Decreases and assembly man-hours are reduced.
According to the method for manufacturing a solenoid valve device according to claim 7 of the present invention, the guide member and the stopper of the movable member are molded with a resin material that insert-molds the mold material of the first fixed core, the second fixed core, the coil portion, and the movable core. As a result, the number of parts is reduced and the number of assembly steps is reduced.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a plurality of examples showing embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
A solenoid valve device according to a first embodiment of the present invention is shown in FIGS. The electromagnetic valve device 10 is a valve device that opens and closes the flow path of evaporative fuel, for example, in a system that sends evaporative fuel generated in a fuel tank of an automobile to an engine.
[0014]
A fixed core 11 as a first fixed core of the electromagnetic valve device 10 shown in FIG. 1 is formed in a cylindrical shape, and a yoke 12 is caulked and fixed to one end of the fixed core 11. The core plate 13 as the second fixed core is connected to the yoke 12 on the other end side of the fixed core 11. The fixed core 11, the yoke 12, and the core plate 13 are made of a magnetic material. The bobbin 20 around which the coil 21 is wound is disposed on the outer periphery of the fixed core 11 so as to be sandwiched between the yoke 12 and the core plate 13. The bobbin 20 and the coil 21 constitute a coil part.
[0015]
The filling resin 30 insert-molds the fixed core 11, the yoke 12, the core plate 13, the bobbin 20 and the coil 21. The filling resin 30 forms the connector 31 and the guide member 35. The terminal 32 is embedded in the connector 31 and is electrically connected to the coil 21. The guide member 35 is formed so as to fill the inside of the fixed core 11 and to protrude toward the valve member 41 described later. The guide member 35 guides the inner peripheral wall of the movable core 40 so as to reciprocate.
[0016]
The movable core 40, the valve member 41, and the leaf spring 42 constitute a movable member and reciprocate together. The movable core 40 is formed of a magnetic material in a cylindrical shape, and is disposed on the inner peripheral side of the core plate 13. The movable core 40 is fixed to a disc-shaped plate spring 42 by welding or the like. The rubber valve member 41 is fitted to the leaf spring 42. The outer periphery of the leaf spring 42 is sandwiched between the filling resin 30 and the flow path member 50. One end of the coil spring 43 is in contact with the leaf spring 42 and the other end is in contact with the guide member 35. The coil spring 43 urges the leaf spring 42 toward the valve seat 53 formed in the flow path member 50.
[0017]
The flow path member 50 is coupled to the filling resin 30. A suction port 51 and a discharge port 52 are integrally formed in the flow path member 50. When the valve member 41 is separated from the valve seat 53, the fluid that has flowed from the suction channel 100 of the suction port 51 is discharged from the discharge channel 101 of the discharge port 52. The suction flow path 100 and the discharge flow path 101 constitute a “fluid flow path” recited in the claims.
[0018]
Next, the structure of the fixed core 11 and the guide member 35 will be described in detail.
As shown in FIG. 2, the valve member 41 side end of the fixed core 11 has a large-diameter portion 11a and a small-diameter portion 11b that is disposed closer to the valve member 41 than the large-diameter portion 11a and has a smaller diameter than the large-diameter portion 11a. have. A step 11c is formed between the large diameter portion 11a and the small diameter portion 11b. The guide member 35 has a guide portion 36 having a smaller diameter than the large diameter portion 11a and a larger diameter than the small diameter portion 11b, and a stopper 37 protruding from the guide portion 36 toward the valve member 41 and having a smaller diameter than the guide portion 36. are doing. The guide part 36 covers the outer periphery of the small diameter part 11b. When the movable core 40 is attracted to the first fixed core 11, the stopper 37 locks the valve member 41 and defines the amount of movement of the movable core 40 and the valve member 41. When the outer diameter of the small diameter portion 11b is r1, the outer diameter of the guide portion 36 is r2, and the inner diameter of the movable core 40 is r3, r3>r2> r1 is set.
[0019]
Next, the manufacturing procedure of the electromagnetic valve device 10 will be described.
(1) The yoke 12 is caulked and fixed to one end of the fixed core 11.
(2) Insert the bobbin 20 around which the coil 21 is wound on the outer periphery of the fixed core 11 and the inner periphery of the yoke 12.
(3) The core plate 13 is connected to the yoke 12 on the other end side of the fixed core 11.
(4) In order to assemble the movable core 40 after filling the resin, the mold material of the movable core 40 is positioned.
(5) The fixed core 11, the yoke 12, the core plate 13, the bobbin 20 around which the coil 21 is wound, and the mold material are insert-molded with resin. At this time, the guide member 35 is formed of resin.
(6) Remove the mold material and assemble the movable core 40.
The electromagnetic valve device 10 is manufactured by assembling the flow path member 50 and other members to the structure thus assembled.
[0020]
Next, the operation of the electromagnetic valve device 10 will be described.
(1) When the coil 21 is turned off, the valve member 41 is seated on the valve seat 53 by the biasing force of the coil spring 43. Therefore, the communication between the suction flow path 100 and the discharge flow path 101 is blocked, and the fluid is not discharged from the discharge flow path 101.
[0021]
(2) When the coil 21 is energized, the movable core 40 is attracted to the fixed core 11 side by the magnetic force generated by the coil 21. When the movable core 40 is sucked toward the fixed core 11, the valve member 41 is separated from the valve seat 53. As a result, the suction flow channel 100 and the discharge flow channel 101 communicate with each other, and the fluid is discharged from the discharge flow channel 101. The movement of the movable core 40 and the valve member 41 stops when the valve member 41 is locked to the stopper 37 of the guide member 35.
[0022]
When the movable core 40 moves toward the fixed core 11 and the inner peripheral wall of the movable core 40 overlaps with the outer peripheral wall of the small diameter portion 11b, a magnetic attractive force acts in the radial direction between the movable core 40 and the small diameter portion 11b. The magnetic attraction force acting in the axial direction between the movable core 40 and the fixed core 11 increases as the axial gap formed between the fixed core 11 and the movable core 40 in the axial direction decreases. Here, the axial gap represents the distance between the movable core 40 and the facing portion of the fixed core 11 facing the movable core 40 in the axial direction. In the first embodiment, the fixed core 11 facing the movable core 40 in the axial direction. The facing portion is a step 11c.
[0023]
As the movable core 40 approaches the fixed core 11 and the axial gap becomes smaller, the facing area in which the inner peripheral wall of the movable core 40 and the outer peripheral wall of the small diameter portion 11b face in the radial direction increases, and the movable core 40 and the small diameter portion 11b The magnetic attraction force acting in the radial direction in between increases. Therefore, as shown in FIG. 3, it is possible to suppress the increase of the magnetic attractive force acting in the axial direction until the axial gap is reduced to some extent, and to flatten the characteristics of the axial gap and the magnetic attractive force.
[0024]
Further, since the guide portion 36 of the guide member 35 guides the inner peripheral wall of the movable core 40 so as to reciprocate, the inner peripheral wall of the core plate 13 disposed on the outer peripheral side of the movable core 40 when the filling resin 30 is filled. It is not necessary to cover the outer peripheral wall of the movable core 40 with resin. Therefore, the side gap d formed between the outer peripheral wall of the movable core 40 and the inner peripheral wall of the core plate 13 can be made as small as possible. By reducing the side gap d, the magnetic attractive force by which the fixed core 11 attracts the movable core 40 increases.
[0025]
Compared to the conventional configuration in which the inner peripheral side of the core plate 13 is covered with resin and the outer peripheral wall of the movable core 40 is guided with resin, as shown in FIG. 3, the magnetic attractive force when the shaft gap is large is increased. Therefore, the size of the shaft gap that satisfies the minimum magnetic attraction force necessary for attracting the movable core 40 is larger than that of the conventional example. The shaft gap (maximum gap) when the coil 21 is not energized and the shaft gap (minimum gap) when the valve member 41 collides with the stopper 37 are increased, and the characteristic curve shown in FIG. This range can be the movable range of the movable core 40. Thereby, the speed when the valve member 41 collides with the stopper 37 decreases, and the bounce when the valve member 41 collides with the stopper 37 becomes small. Therefore, when the valve opening time is short and the fluid flow rate discharged from the suction flow channel 100 to the discharge flow channel 101 is small, the variation in the fluid flow rate can be reduced. Furthermore, since the reduction of the opening area of the flow path can be prevented when the bounce of the valve member 41 becomes small, the linear relationship between the valve opening time and the fluid flow rate can be maintained even when the fluid flow rate is small.
[0026]
If the shaft gap is the same as that of the conventional example, the same magnetic attractive force is generated even if the number of turns of the coil is reduced. Therefore, if the number of turns of the coil is reduced as much as possible, the electromagnetic valve device can be reduced in size.
[0027]
(Second embodiment)
A second embodiment of the present invention is shown in FIGS. Components that are substantially the same as those in the first embodiment are denoted by the same reference numerals.
The end portion on the valve member 41 side of the fixed core 60 as the first fixed core of the second embodiment is disposed on the valve member 41 side with respect to the large diameter portion 61 and the large diameter portion 61 and has a smaller diameter than the large diameter portion 61. And a small diameter portion 62. A step 63 is formed between the large diameter portion 61 and the small diameter portion 62. The small-diameter portion 62 has a concave portion 62b that is disposed closer to the movable core 40 than the distal end portion 62a on the side of the movable core 40 and has a smaller diameter than the distal end portion 62a.
[0028]
When the movable core 40 moves toward the fixed core 60 and the inner peripheral wall of the movable core 40 overlaps with the outer peripheral wall of the distal end portion 62a of the small diameter portion 62, magnetic attraction is performed in the radial direction between the movable core 40 and the distal end portion 62a. Power works. When the movable core 40 is further sucked toward the first fixed core 60 and the large-diameter-side tip of the movable core 40 passes through the tip 62a, the gap between the tip of the movable core 40 and the tip 62a of the fixed core 60 is reached. In addition, a magnetic attractive force acts in a direction opposite to the direction in which the movable core 40 is attracted to the fixed core 60 side. Therefore, as shown in FIG. 3, when the valve member 41 collides with the stopper 37, the magnetic attractive force acting in the axial direction between the fixed core 60 and the movable core 40 decreases, and the valve member 41 collides with the stopper 37. The speed when you do. Therefore, the bounce of the valve member 41 when colliding with the stopper 37 is reduced. The shaft gap in the second embodiment represents the shaft gap formed between the step 63 and the movable core 40.
[0029]
(Third embodiment)
A third embodiment of the present invention is shown in FIG. Components that are substantially the same as those in the first embodiment are denoted by the same reference numerals.
The fixed core 70 as the first fixed core has an accommodating portion 71 that forms a space 71 a into which the movable core 40 can enter at the end of the valve member 41. The guide member 80 fills the inner peripheral side of the fixed core 70 and guides the inner peripheral wall of the movable core 40 so as to reciprocate, and a stopper 82 that protrudes further toward the valve member 41 than the guide portion 81. have. The stopper 82 has a smaller diameter than the guide portion 81. When the inner diameter of the accommodating portion 71 is r1, the outer diameter of the guide portion 81 is r2, the inner diameter of the movable core 40 is r3, and the outer diameter of the movable core 40 is r4, r1>r4>r3> r2.
[0030]
When the movable core 40 moves toward the fixed core 70 and the outer peripheral wall of the movable core 40 overlaps with the inner peripheral wall of the accommodating portion 71, a magnetic attractive force acts in the radial direction between the movable core 40 and the accommodating portion 71. When the movable core 40 is further attracted to the fixed core 70 side, the magnetic attraction force acting in the radial direction between the movable core 40 and the accommodating portion 71 increases. Therefore, it is possible to suppress the increase of the magnetic attractive force acting in the axial direction until the axial gap is reduced to some extent, and to flatten the characteristics of the axial gap and the magnetic attractive force. The shaft gap in the third embodiment represents the shaft gap formed between the bottom surface 72 of the accommodating portion 71 and the movable core 40.
[0031]
In addition to the configuration of the third embodiment, a recess having an inner diameter larger than that of the distal end portion of the accommodating portion 71 on the valve member 41 side may be formed on the counter movable core side of the accommodating portion 71. When the movable core 40 is sucked toward the fixed core 70 and the distal end of the movable core 40 on the stationary core 70 side passes through the distal end portion of the accommodating portion 71, the movable core 40 is interposed between the distal end portion of the movable core 40 and the distal end portion of the accommodating portion 71. The magnetic attraction force acts in a direction opposite to the direction in which the movable core 40 is attracted to the fixed core 70 in the axial direction. Therefore, when the valve member 41 collides with the stopper 82, the magnetic attractive force acting in the axial direction between the fixed core 70 and the movable core 40 decreases, and the speed when the valve member 41 collides with the stopper 82 decreases. . Therefore, the bounce of the valve member 41 when colliding with the stopper 82 is reduced.
[0032]
In the plurality of embodiments of the present invention described above, the inner peripheral wall of the movable core is guided so as to be reciprocally movable by the guide member integrally formed of resin when the fixed core, the core plate, and the coil portion are insert-molded. . Therefore, there is no need to provide a guide member for guiding the movable core so as to reciprocate on the inner peripheral side of the core plate provided on the outer periphery of the movable core. Since the side gap formed in the radial direction between the movable core and the core plate can be made as small as possible, the magnetic attractive force for attracting the movable core to the fixed core facing the movable core in the axial direction is increased. Therefore, the number of turns of the coil can be reduced and the electromagnetic valve device can be downsized.
[0033]
In order to attract the movable core to the fixed core even if the axial gap formed in the axial direction between the fixed core and the movable core is increased when the coil 21 is de-energized by increasing the magnetic attractive force Necessary magnetic attractive force can be obtained. The magnetic attractive force acting in the axial direction between the axial gap, the fixed core, and the movable core increases rapidly as the movable core approaches the fixed core. Therefore, in the above embodiments, the characteristics of the magnetic gap acting in the axial direction between the shaft gap and the fixed core and the movable core are relatively flat by shifting the range of the shaft gap to be used in the larger direction. Can use part. Furthermore, as the movable core approaches the fixed core, a force acts to attract the movable core in the radial direction between the movable core and the fixed core, so that the movable core moves in the axial direction as the movable core approaches the fixed core. An increase in the magnetic attractive force to be attracted is suppressed.
[0034]
Therefore, the speed when the movable member collides with the stopper is reduced, and the bound of the movable member is reduced. Thereby, even when the valve opening time is short and the fluid flow rate discharged from the suction flow channel 100 through the discharge flow channel 101 is small, the variation in the fluid flow rate can be reduced. Furthermore, since the reduction of the opening area of the flow path can be prevented when the bounce of the valve member 41 becomes small, the linear relationship between the valve opening time and the fluid flow rate can be maintained even when the fluid flow rate is small.
[0035]
In the above embodiments, the guide member has a stopper, but the guide member and the stopper may be separate members. Further, although the filling resin 30 having the connector 31 and the guide member are integrally formed, the guide member can be separated from the connector 31.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a solenoid valve device according to a first embodiment of the present invention.
FIG. 2 is an enlarged view of a II line portion of FIG.
FIG. 3 is a characteristic diagram showing a relationship between an axial gap and a magnetic attractive force according to the first embodiment, the second embodiment, and the conventional example.
FIG. 4 is a cross-sectional view showing a solenoid valve device according to a second embodiment of the present invention.
FIG. 5 is an enlarged view of a V line portion in FIG. 4;
FIG. 6 is a sectional view showing a solenoid valve device according to a third embodiment of the present invention.
[Explanation of symbols]
10 Solenoid valve device 11, 60, 70 Fixed core (first fixed core)
13 Core plate (second fixed core)
20 Bobbin (Coil part)
21 Coil (Coil part)
35, 80 Guide members 36, 81 Guide portions 37, 82 Stopper 40 Movable core 41 Valve member 53 Valve seat 61 Large diameter portion 62 Small diameter portion 62a Tip portion 62b Recess 71 Housing portion 71a Space 100 Suction channel (fluid channel)
101 Discharge channel (fluid channel)

Claims

A coil part having a bobbin and a coil wound around the bobbin;
A movable member having a movable core formed in a cylindrical shape and opening and closing a fluid flow path by reciprocating;
A first fixed core that faces the movable core in a reciprocating direction of the movable core and attracts the movable core by a magnetic force generated by energizing the coil;
A second fixed core facing the outer peripheral wall of the movable core and forming a magnetic circuit with the movable core and the first fixed core;
A guide member that is disposed on a side of the first fixed core facing the movable core, is formed of a nonmagnetic material, and guides an inner peripheral wall of the movable core so as to be reciprocally movable ;
The end portion of the first fixed core that faces the movable core has a large diameter portion, and a small diameter portion that is disposed on the movable core side of the large diameter portion and has an outer diameter smaller than the large diameter portion, An electromagnetic valve device , wherein r3>r2> r1, where r1 is an outer diameter of the small diameter portion, r2 is an outer diameter of the guide member, and r3 is an inner diameter of the movable core .

The solenoid valve device according to claim 1, wherein the small diameter portion includes a tip portion and a concave portion that is formed on the side opposite to the movable core of the tip portion and has a smaller diameter than the tip portion.

A coil part having a bobbin and a coil wound around the bobbin;
  A movable member having a movable core formed in a cylindrical shape and opening and closing a fluid flow path by reciprocating;
  A first fixed core that faces the movable core in a reciprocating direction of the movable core and attracts the movable core by a magnetic force generated by energizing the coil;
  A second fixed core facing the outer peripheral wall of the movable core and forming a magnetic circuit with the movable core and the first fixed core;
  A guide member that is disposed on a side of the first fixed core facing the movable core, is formed of a nonmagnetic material, and guides an inner peripheral wall of the movable core so as to be reciprocally movable;
  The end portion of the first fixed core that faces the movable core has a housing portion that forms a space in which the movable core can enter, and the inner diameter of the housing portion is r1, and the outer diameter of the guide member is r2. An electromagnetic valve device, wherein r1> r4> r3> r2, where r3 is an inner diameter of the movable core and r4 is an outer diameter of the movable core.

4. The electromagnetic valve device according to claim 1, wherein the guide member locks the movable member moving toward the first fixed core with a predetermined movement amount. 5.

The electromagnetic wave according to any one of claims 1 to 4, wherein the guide member is formed of a resin material in which the first fixed core, the second fixed core, and the coil portion are insert-molded. Valve device.

It is a manufacturing method of the solenoid valve device according to any one of claims 1 to 5,
  Inserting the coil portion on the outer periphery of the first fixed core;
  Disposing the second fixed core on the movable core side of the coil portion;
  Positioning the mold of the movable core;
  Molding the guide member with a resin material that insert-molds the first fixed core, the second fixed core, the coil portion, and the mold material;
  Removing the mold material and assembling the movable core;
  The manufacturing method of the solenoid valve apparatus characterized by having.

The method of manufacturing an electromagnetic valve device according to claim 6, wherein the guide member also serves as a stopper that regulates a moving amount of the movable member toward the first fixed core.