JP4093525B2

JP4093525B2 - 3-way solenoid valve

Info

Publication number: JP4093525B2
Application number: JP2001109170A
Authority: JP
Inventors: 真一郎友田; 明長崎; 将行柴田; 繁人竜円; 昇日野
Original assignee: Keihin Corp
Current assignee: Keihin Corp
Priority date: 2001-04-06
Filing date: 2001-04-06
Publication date: 2008-06-04
Anticipated expiration: 2021-04-06
Also published as: JP2002310323A

Description

【０００１】
【発明の属する技術分野】
本発明は、三方電磁弁に関し、特に、一端に端壁部を有して磁性金属により構成されるソレノイドハウジングにコイル組立体が収容され、コイル組立体の他端に対向する磁性金属製のヨーク板がソレノイドハウジングの他端に結合され、可動コアの軸方向移動を案内する非磁性材料製のカラーが前記ヨーク板の中心部を貫通して配置され、ヨーク板に一端が連設される弁ハウジングに、該弁ハウジング内の弁室に臨む第１および第２弁座が相互に対向して設けられ、第１および第２弁座への択一的な着座を可能とした弁体に、可動コアに連動、連結されるロッドが連接される三方電磁弁の改良に関する。
【０００２】
【従来の技術】
従来、かかる三方電磁弁は、たとえば特開平３−１５７５７６号公報等により既によく知られており、このものでは、カラーで軸方向移動を案内される可動コアにロッドの一端が同軸に嵌合されている。
【０００３】
【発明が解決しようとする課題】
ところが、上記従来の三方電磁弁では、可動コアおよびロッドが実質的に一体化されており、しかも可動コアだけの軸方向移動がガイドされる構成であるので、ロッドの軸心位置は、可動コアおよびロッドの同軸性、ならびに可動コアをガイドするカラーの軸心位置精度の影響を受けることになり、可動コアおよびロッドのカラーおよび弁ハウジング内での円滑な軸方向移動を保証するためには、可動コアをガイドするカラー、可動コアおよびロッドの加工精度および組付精度を高めねばならず、コスト増大を招いている。
【０００４】
本発明は、かかる事情に鑑みてなされたものであり、カラー、可動コアおよびロッドの加工および組付を容易とし、コスト低減を可能とした三方電磁弁を提供することを目的とする。
【０００５】
【課題を解決するための手段】
上記目的を達成するために、請求項１記載の発明は、中心孔を有する合成樹脂製のボビンならびに該ボビンに巻装されるコイルを備えるコイル組立体が、一端に端壁部を有して磁性金属により構成されるソレノイドハウジングに収容され、前記端壁部に磁気的に結合される固定コアが前記中心孔の一端側に挿入され、該固定コアに対向する可動コアが前記中心孔の他端側に挿入され、中心部に貫通孔を有して前記コイル組立体の他端に対向する磁性金属製のヨーク板が前記ソレノイドハウジングの他端に結合され、前記固定コアに一端を対向させる可動コアの軸方向移動を案内する非磁性材料製のカラーが、前記貫通孔を貫通して前記中心孔の他端側に挿入され、前記ヨーク板に一端が連設される弁ハウジングに、該弁ハウジング内に形成される弁室に臨む第１および第２弁座が相互に対向して設けられ、第１および第２弁座への択一的な着座を可能として前記弁室に収容される弁体に、前記可動コアに連動、連結されるロッドが連接される三方電磁弁において、前記ヨーク板に設けられた複数の連結孔を介して前記ボビンに一体に連なる合成樹脂製の前記弁ハウジングに、前記ロッドの軸方向移動を案内するガイド部が設けられ、前記カラーは、半径方向外方に張出して前記中心孔の内面に対向する外向き鍔を軸方向一端に、また半径方向内方に張出す内向き鍔を軸方向他端にそれぞれ一体に有していて前記貫通孔に圧入され、前記可動コアは、前記カラー内に摺動可能に挿入される小径部と、前記カラーの軸方向一端よりも外方で前記小径部の一端に同軸に連設されて該小径部よりも大径に形成され且つ前記中心孔内で前記固定コアに対向する大径部とを一体に備え、前記内向き鍔を軸方向移動可能に貫通する前記ロッドの一端が、前記カラー内で前記小径部の端面に同軸に当接されることを特徴とする。
【０００６】
このような構成によれば、可動コアおよびロッドが分離しているので、相互組付のために加工精度を高める必要はなく、また可動コアおよびロッドの軸心が多少ずれたとしても、カラーおよびガイド部で別々にガイドされる可動コアおよびロッドの軸方向移動に悪影響が及ぶことはなく、したがってカラー、可動コアおよびロッドの加工および組付を容易とし、コスト低減を図ることができる。しかもボビン、ヨーク板および弁ハウジングが一体に成形されるので、ボビン、ヨーク板および弁ハウジングの軸心精度を容易に向上することができる。
【０００７】
また前記カラーは、ボビン中心孔の内面に対向する外向き鍔を軸方向一端に、また内向き鍔を軸方向他端にそれぞれ一体に有してヨーク板の貫通孔に圧入され、また可動コアは、カラー内に摺動可能に挿入される小径部と、カラーの軸方向一端よりも外方で前記小径部の一端に同軸に連設されて該小径部よりも大径に形成され且つボビンの中心孔内で固定コアに対向する大径部とを一体に備え、前記内向き鍔を軸方向移動可能に貫通する前記ロッドの一端が、該カラー内で可動コアの小径部端面に同軸に当接されるので、可動コアのカラー内での摺動には影響を及ぼさない外向き鍔を用いてカラーをヨーク板の貫通孔に圧入することが可能となって、肉厚を極力薄く設定したカラーを貫通孔に圧入することを可能とし、それにより可動コアおよびヨーク板間の間隔を極力小さく設定して磁気特性を向上することが可能となるとともに、可動コアの軸方向移動をヨーク板に固定されるカラーで安定的にガイドすることができ、しかもロッドでカラーの他端側がほぼ塞がれることになり、塵埃がカラー内に侵入することを極力防止することができる。また、外向き鍔付きカラーがボビンの中心孔に挿入されるにもかかわらず、可動コアおよび固定コアの対向面積を比較的大きく設定し、磁気特性を向上させることができる。
【０００８】
請求項２記載の発明は、上記請求項１記載の発明の構成に加えて、前記ヨーク板の中心部には、前記貫通孔の一部を形成する円筒部が、前記コイル組立体とは反対側に突出して一体に設けられることを特徴とし、かかる構成によれば、ヨーク板と一体の円筒部で、軸方向に比較的長い距離にわたりカラーを支持するようにしてカラーの軸線が傾くことを極力防止することができ、またヨーク板のうちカラーを介して可動コアの外面に対向する部分の面積を大きくし、磁路面積の増大による磁気特性向上を図ることができる。
【０００９】
請求項３記載の発明は、上記請求項１の発明の構成に加えて、前記ボビンの一端部には、前記ソレノイドハウジングの端壁部に対向して開口する収容凹部が設けられ、前記コイルに連なって収容凹部に収容されるアース板と、前記端壁部との間に、コイル組立体を前記ヨーク板側に付勢するばね力を発揮する導電金属製のばねが設けられることを特徴とし、かかる構成によれば、コイル組立体をソレノイドハウジング内で安定的に保持するためのばねを用いてソレノイドハウジングにアース板を導通させ、ソレノイドハウジングを接地するようにして、アース用の端子部材を設けることを不要とし、部品点数を低減することができる。
【００１０】
請求項４記載の発明は、上記請求項１記載の発明の構成に加えて、前記端壁部に設けられた透孔を緊密に貫通する連結軸部が前記ボビンに一体に連設され、前記コイルに連なる端子部材を臨ませる合成樹脂製のカプラに、前記端壁部の外面に当接されるカプラ支持板が一体に形成され、該カプラ支持板に設けられた溶着孔に挿通される前記連結軸部とカプラ支持板とが溶着されることを特徴とし、かかる構成によれば、コイル組立体とは別体のカプラをハウジングの端壁部外面側に取付けることができるので、カプラ形状の変更にもかかわらず、カプラを除く部分の変更を不要として汎用性を高めることができる。しかも連結軸部がハウジングの端壁部に設けられた透孔を緊密に貫通するので、ソレノイドハウジングの軸線に直交する平面内での該ソレノイドハウジングに対するボビンすなわちコイル組立体の位置を一定に定めることができ、また端子部材がカプラに嵌合されることによりソレノイドハウジングの軸線に直交する平面内でのコイル組立体に対するカプラの位置を一定に定めることができ、剛性を有するソレノイドハウジングの端部外面にカプラを強固にかつ安定して固定することができる。
【００１１】
請求項５記載の発明は、上記請求項１記載の発明の構成に加えて、前記弁ハウジングには、前記貫通孔に一端を同軸に連通させたガイド孔と、該ガイド孔内に同軸上に配置される前記ロッドの他端部を緩く挿通させる第１弁孔ならびにガイド孔と反対側で第１弁孔を中心部に臨ませる第１弁座を有する隔壁と、該隔壁を前記ガイド孔の他端との間に介在させて該ガイド孔と同軸に配置されるとともに隔壁とは反対側に臨む段部を有する嵌合孔とが設けられ、一端に第２弁座を有するとともに他端には半径方向外方に張出す規制鍔部が設けられる弁座部材が、前記弁室を前記隔壁との間に形成するとともに前記段部に前記規制鍔部を当接させるようにして前記嵌合孔に嵌合、固定されることを特徴とし、かかる構成によれば、弁座部材を弁ハウジングに嵌合、固定した状態で、第２弁座と、弁ハウジングの段部とは軸方向にずれた位置に配置されるこになり、第２弁座および規制鍔部間の長さを変更するだけで、弁ハウジングの長さおよび形状の多様化に対応した第２弁座の位置設定が可能となり、汎用性を高めることができる。
【００１２】
さらに請求項６記載の発明は、上記請求項５記載の発明の構成に加えて、前記弁座部材には、一端を第２弁座の中央部に開口させた第２弁孔が軸方向全長にわたって設けられ、第２弁孔の他端に臨むフィルタの外周部が前記弁座部材の規制鍔部を前記段部との間に挟んで配置され、該フィルタの外周部に前記弁ハウジングの他端がかしめ係合されることを特徴とし、かかる構成によれば、弁座部材およびフィルタの弁ハウジングへの組付けを容易とすることができる。
【００１３】
【発明の実施の形態】
以下、本発明の実施形態を、添付図面に示した本発明の実施例に基づいて説明する。
【００１４】
図１〜図４は本発明の第１実施例を示すものであり、図１は三方電磁弁の縦断面図、図２は図１の２−２線拡大断面図、図３はソレノイド部の分解斜視図、図４は図２の下部の拡大図である。
【００１５】
先ず図１において、この三方電磁弁１４は、流体供給源（図示せず）に連なる入口通路１１を流体圧アクチュエータ（図示せず）に連なる出口通路１２に連通させるとともにリザーバ（図示せず）に連なる排出通路１３および前記出口通路１２間を遮断する状態、ならびに入口通路１１および出口通路１２間を遮断するとともに排出通路１３および出口通路１２間を連通する状態を切換えるように作動する弁部１５と、該弁部１５を切換作動させるための電磁力を発揮するソレノイド部１６とで構成される。
【００１６】
図２および図３を併せて参照して、ソレノイド部１６は、コイル組立体１７と、該コイル組立体１７を収容せしめる磁性金属製のソレノイドハウジング１８と、ソレノイドハウジング１８に結合される磁性金属製のヨーク板１９と、ソレノイドハウジング１８に一体に形成される固定コア２０と、該固定コア２０に対向する可動コア２１とを備える。
【００１７】
コイル組立体１７は、中心孔２２を有する合成樹脂製のボビン２３と、そのボビン２３に巻装されるコイル２４と、被覆部２５とを備え、被覆部２５は、たとえば合成樹脂製のテープをボビン２３に巻装されたコイル２４に巻き付けることで構成される。
【００１８】
ソレノイドハウジング１８は、コイル組立体１７の軸方向一端に対向する端壁部１８ａを一端に一体に有して有底円筒状に形成されており、棒状に形成されて前記中心孔２２に一端側から挿入される固定コア２０の一端が、ソレノイドハウジング１８の端壁部１８ａの中央部にたとえば一体に連設されることにより、ソレノイドハウジング１８に磁気的に結合される。
【００１９】
ヨーク板１９は、前記中心孔２２に対応する貫通孔２６を中心部に有して前記コイル組立体１７の他端に対向するものであり、ヨーク板１９の外周がソレノイドハウジング１８の他端にかしめ結合等により結合される。しかもヨーク板１９の中心部には、前記貫通孔２６の一部を形成する円筒部１９ａが、前記コイル組立体１７とは反対側に突出して一体に設けられる。
【００２０】
前記可動コア２１の軸方向移動は、非磁性材料たとえばステンレス鋼から成る円筒状のカラー２７で案内されるものであり、該カラー２７は、前記貫通孔２６を貫通して該貫通孔２６に圧入されつつ前記中心孔２２の他端側に挿入される。カラー２７の一端には、半径方向外方に張出して前記中心孔２２の内面に対向する外向き鍔２７ａが一体に設けられ、またカラー２７の他端には、半径方向内方に張出す内向き鍔２７ｂが一体に設けられる。
【００２１】
一方、可動コア２１は、カラー２７に挿入される小径部２１ａと、該小径部２１ａよりも大径に形成されて固定コア２０の他端に対向する大径部２１ｂとを一体に備えるものであり、大径部２１ｂは、前記カラー２７の軸方向一端よりも外方で前記小径部２１ａの一端に同軸に連設される。この可動コア２１の一端部には、該可動コア２１および固定コア２０間に設けられる戻しばね２８の一部を収容する凹部２９が同軸に設けられる。
【００２２】
また前記大径部２１ｂの外面には、前記中心孔２２の内面との間に流路３０を形成する溝３１が大径部２１ｂの軸方向全長にわたって延びるようにして、たとえば複数条設けられ、前記流路３０および前記凹部２９間を結ぶ連通孔３２が可動コア２１に設けられる。
【００２３】
ソレノイドハウジング１８外には、コイル組立体１７が備えるコイル２４の一端に連なってボビン２３から延出される端子部材３５を内部に臨ませる合成樹脂製のカプラ３６が配置されるものであり、このカプラ３６は、ソレノイドハウジング１８の端壁部１８ａ外面に当接される円板状のカプラ支持板３７と一体に形成される。
【００２４】
ソレノイドハウジング１８の端壁部１８ａには、一対の透孔３８，３８と、端子貫通孔３９とが設けられ、両透孔３８，３８を貫通するたとえば一対の連結軸部４０，４０の一端が前記ボビン２３に一体に連設される。一方、カプラ支持板３７には、前記各透孔３８，３８に対応した一対の溶着孔４１，４１が設けられており、これらの溶着孔４１，４１の前記端壁部１８ａとは反対側の端部に、前記端壁部１８ａから遠ざかるにつれて大径となるテーパ部４１ａ，４１ａが設けられる。
【００２５】
前記溶着孔４１，４１には各連結軸部４０，４０がそれぞれ挿通され、各連結軸部４０，４０の他端部とカプラ支持板３７とが、前記両連結軸部４０，４０のうち前記両溶着孔４１，４１から突出した部分が軸方向に押し潰されるようにして、熱溶着される。
【００２６】
しかも２組の前記溶着孔４１，４１および前記連結軸部４０，４０は、前記カプラ３６を相互間に挟む位置に配置される。
【００２７】
前記端子部材３５の前記ボビン２３側基部が、ボビン２３と一体に形成されて前記端子貫通孔３９に嵌合される合成樹脂製の被覆部４２で覆われており、端子部材３５は略Ｌ字状に屈曲されてカプラ３６に嵌合される。
【００２８】
また前記コイル組立体１７が備えるコイル２４の他端に連なるリング状のアース板４３が、ボビン２３の一端外面に設けられた収容凹部４４に収容されており、このアース板４４および端壁部１８ａ間には、コイル組立体１７をヨーク板１９側に押圧してコイル組立体１７のソレノイドハウジング１８内での位置を一定に保持するばね４５が設けられる。しかも該ばね４５は導電金属により形成されるものであり、アース板４３はばね４５を介してソレノイドハウジング１８に導通される。さらにソレノイドハウジング１８には、該ソレノイドハウジング１８を図示しない金属製支持部材に支持するためのブラケット４６が溶接されており、コイル２４の他端は、アース板４３、ばね４５、ソレノイドハウジング１８、ブラケット４６および前記支持部材を介して接地される。
【００２９】
図４を併せて参照して、弁部１５は、合成樹脂製の弁ハウジング４８と、該弁ハウジング４８内に収容される球状の弁体４９と、ソレノイド部１６の可動コア２１および弁体４９間を連動、連結するロッド５０とを備える。
【００３０】
弁ハウジング４８の一端は、ソレノイド部１６におけるコイル組立体１７のボビン２３に一体に連設される。すなわちヨーク板１９には、複数の連結孔５４，５４…が設けられており、それらの連結孔５４，５４…を介してボビン２３に一体に連なる弁ハウジング４８と、ボビン２３と、それら４８，２３の間に挟まれるヨーク板１９とが一体にモールド結合される。
【００３１】
弁ハウジング４８には、ソレノイド部１６が備えるヨーク板１９の貫通孔２６に一端を同軸に連通させたガイド孔５５と、該ガイド孔５５と同軸の第１弁孔６１ならびにガイド孔５５と反対側で第１弁孔６１を中心部に臨ませる第１弁座６２を有する隔壁５７と、該隔壁５７を前記ガイド孔５５の他端との間に介在させて該ガイド孔５５と同軸に配置されるとともに隔壁５７とは反対側に臨む段部６５が隔壁５７とは反対側の端部内面に形成される嵌合孔５６とが設けられる。
【００３２】
ロッド５０はガイド孔５５内に同軸に配置されており、このロッド５０が他端部に備える小径軸部５０ａが第１弁孔６１に緩く挿通される。またガイド孔５５内には、ロッド５０の軸方向移動をガイドするガイド部５２として機能する金属製の円筒部材が圧入されており、この円筒部材の外周の軸方向全長には流路３４を弁ハウジング４８との間に形成するようにして溝５２ａがたとえば複数条設けられ、ソレノイド部１６のヨーク板１９およびガイド部５２間で弁ハウジング４８内には、排出通路１３に通じる開放室５９が形成される。
【００３３】
ところでソレノイド部１６におけるカラー２７の他端には、半径方向内方に張出す内向き鍔２７ｂがカラー２７の他端に一体に設けられており、該内向き鍔２７ｂを軸方向移動可能に貫通する前記ロッド５０の一端が前記カラー２７内で前記可動コア２１の他端に同軸に当接される。しかもロッド５０の一端には、該ロッド５０の軸線上を仮想中心とする球面状の当接面５０ｂが形成されており、該当接面５０ｂが前記可動コア２１の他端に当接される。
【００３４】
一端にテーパ状の第２弁座６４を有するとともに他端には半径方向外方に張出す規制鍔部５３ａが設けられる弁座部材５３が、出口通路１２に連通する弁室５８を前記隔壁５７との間に形成するとともに前記段部６４に規制鍔部５３ａを当接させるようにして前記嵌合孔５６に嵌合され、嵌合孔５６の内面に弾発接触するＯリング６６が弁座部材５３の外周に装着される。
【００３５】
弁室５８には第１および第２弁座６２，６４に択一的に着座可能な球状の弁体４９が収容され、第１弁孔６１を緩く貫通するロッド５０の小径軸部５０ａが弁体４９に当接する。
【００３６】
弁座部材５３には、一端を第２弁座６４の中央部に開口させた第２弁孔６３が軸方向全長にわたって設けられ、第２弁孔６３および入口通路１１間に介在して第２弁孔６３の他端を臨ませるフィルタ６７の外周部が、弁座部材５３の規制鍔部５３ａを前記段部６５との間に挟んで配置され、該フィルタ６７の外周部に前記弁ハウジング４８の他端が熱かしめ等によりかしめ係合される。これにより嵌合孔５６に嵌合される弁座部材５３が弁ハウジング４８に固定されることになる。
【００３７】
フィルタ６７は、リング状に形成される枠部材６８の内周に網状部材６９が支持されて成るものであり、第２弁孔６３の他端には、大径端を枠部材６８の内径に対応させつつフィルタ６７側に向かうにつれて大径となるように形成されたテーパ孔部６３ａが同軸に設けられる。
【００３８】
ところで、前記弁座部材５３は、金属もしくは合成樹脂により形成されるものであり、金属製の弁座部材５３としたときには、第２弁座６４の第２弁座６４の形状精度を高め、シート性を良好とするこができ、また合成樹脂製の弁座部材５３としたときには、弁座部材５３の製造を容易とし、低コスト化を図ることが可能となる。
【００３９】
次にこの第１実施例の作用について説明すると、ソレノイド部１６のコイル２４に通電すると、可動コア２１は戻しばね２８のばね力に抗して固定コア２０側に吸引される。このため入口通路１１からフィルタ６７を介して第２弁孔６３に流体圧が作用している状態では、弁体４９が第２弁座６４から離座するように押上げられて第１弁座６２に着座する。したがって第２弁孔６３が開き、第１弁孔６１が閉じられることになり、入口通路１１が出口通路１２に連通し、出口通路１２および排出通路１３間が遮断される。
【００４０】
一方、ソレノイド部１６のコイル２４への通電を停止すると、可動コア２１は戻しばね２８のばね力によって固定コア２０から離反する方向に作動する。このため弁体４９は、第１弁座６２から離座して第２弁座６４に着座するようにロッド５０で押圧される。したがって第１弁孔６１が開き、第２弁孔６３が閉じられることになり、出口通路１２が排出通路１３に連通し、出口通路１２および入口通路１１間が遮断される。
【００４１】
このような三方電磁弁１４において、ソレノイド部１６にあっては、ソレノイドハウジング１８の端壁部１８ａに設けられた透孔３８，３８を貫通する合成樹脂製の連結軸部４０，４０の一端がボビン２３に連設され、コイル組立体１７とは別体のカプラ３６と一体に形成されて端壁部１８ａの外面に当接されるカプラ支持板３７と、該カプラ支持板３７の溶着孔４１，４１に挿通される連結軸部４０，４０の他端部とが溶着され、端壁部１８ａの端子貫通孔３９を貫通する端子部材３５がカプラ３６に嵌合される。したがってコイル組立体１７とは別体のカプラ３６をソレノイドハウジング１８の端壁部１８ａ外面側に取付けることができ、カプラ３６の形状の変更にもかかわらず、カプラ３６を除く部分の変更を不要として汎用性を高めることができる。しかも連結軸部４０，４０およびボビン２３が一体に形成されるので、連結軸部４０，４０を設けることによる部品点数の増大および組付工数の増大を回避することができる。
【００４２】
またカプラ支持板３７および連結軸部４０，４０を溶着するにあたり、連結軸部４０，４０のうち前記溶着孔４１，４１から突出した部分が軸方向に押し潰されてカプラ支持板３７に熱溶着されるので、超音波溶着等の高価な溶着設備および治具を不要として、カプラ支持板３７および連結軸部４０，４０を溶着することができ、熱溶着による安価な設備および治具を用いることができる。この際、溶着孔４１，４１の前記端壁部１８ａとは反対側の端部に、前記端壁部１８ａから遠ざかるにつれて大径となるテーパ部４１ａ，４１ａが設けられているので、溶着孔４１，４１の軸方向と直交する方向での溶着強度を高めることができる。
【００４３】
しかも連結軸部４０，４０がソレノイドハウジング１８の端壁部１８ａに設けられた透孔３８，３８を貫通するので、ソレノイドハウジング１８の軸線に直交する平面内での該ソレノイドハウジング１８に対するボビン２３すなわちコイル組立体１７の位置を一定に定めることができ、また端子部材３５がカプラ３６に嵌合されることによりソレノイドハウジング１８の軸線に直交する平面内でのコイル組立体１７に対するカプラ３６の位置を一定に定めることができ、剛性を有するソレノイドハウジング１８の端壁部１８ａ外面にカプラ３６を強固にかつ安定して固定することができる。
【００４４】
また相互に対をなす２組の溶着孔４１，４１および連結軸部４０，４０が、前記カプラ３６を相互間に挟む位置に配置されるので、ソレノイドハウジング１８が備える端壁部１８ａの外面へのカプラ３６の取付け、固定を確実なものとすることができ、カプラ支持板３７が円板状に形成されるので、ソレノイドハウジング１８の全周方向でのカプラ３６の荷重強度を高めることができる。
【００４５】
また端子部材３５のボビン２３側基部が、ボビン２３と一体に形成されて端子貫通孔３９に嵌合される合成樹脂製の被覆部４２で覆われており、端子部材３５およびソレノイドハウジング１８間の絶縁を図りつつ、ソレノイドハウジング１８に対するボビン２３およびカプラ３６の位置決めにガイド部４２を利用することができ、連結軸部４０，４０がソレノイドハウジング１８の透孔３８，３８を貫通することと相まって、ソレノイドハウジング１８に対するボビン２３およびカプラ３６の位置決めをより強固なものとすることができる。
【００４６】
さらに可動コア２１の軸方向移動を案内する非磁性材料製のカラー２７が、ヨーク板１９の中心部に設けられた貫通孔２６を貫通するようにして該貫通孔２６に圧入され、半径方向外方に張出してボビン２３の中心孔２２の内面に対向する外向き鍔２７ａがカラー２７の一端に一体に設けられているので、可動コア２１のカラー２７内での摺動には影響を及ぼさない外向き鍔２７ａを用いてカラー２７をヨーク板１９の貫通孔２６に圧入することが可能となり、そのようにすることで、肉厚を極力薄く設定したカラー２７を貫通孔２６に圧入することを可能とし、その結果、可動コア２１およびヨーク板１９間の間隔を極力小さく設定して磁気特性を向上することが可能となるとともに、可動コア２１の軸方向移動をヨーク板１９に固定されるカラー２７で安定的にガイドすることができる。
【００４７】
ヨーク板１９の中心部には前記貫通孔２６の一部を形成する円筒部１９ａが、コイル組立体１７とは反対側に突出して一体に設けられており、ヨーク板１９と一体の円筒部１９ａで、軸方向に比較的長い距離にわたりカラー２７を支持するようにしてカラー２７の軸線が傾くことを極力防止することができ、またヨーク板１９のうちカラー２７を介して可動コア２１の外面に対向する部分の面積を大きくし、磁路面積の増大による磁気特性向上を図ることができる。
【００４８】
また可動コア２１は、カラー２７に挿入される小径部２１ａと、該小径部２１ａよりも大径に形成されて前記固定コア２０の他端に対向するようにして前記カラー２７の軸方向一端よりも外方で前記小径部２１ａの一端に同軸に連設される大径部２１ｂとを一体に備えるものであり、カラー２７がボビン２３の中心孔２２に挿入されるにもかかわらず、可動コア２１および固定コア２０の対向面積を比較的大きく設定し、ヨーク板１９のうちカラー２７を介して可動コア２１の外面に対向する部分の面積を大きくしたことと相まって、磁気特性をより一層向上することができる。
【００４９】
可動コア２１の一端部には該可動コア２１および固定コア２０間に設けられる戻しばね２８の一部を収容する凹部２９が、同軸に設けられており、可動コア２１の一端側に大径部２１ｂが設けられるにもかかわらず可動コア２１を軽量化し、可動コア２１の迅速な軸方向移動を可能とすることができる。また大径部２１ｂの外面には、中心孔２２の内面との間に流路３０を形成する溝３１が大径部２１ｂの軸方向全長にわたって延びるようにして設けられているので、可動コア２１の軸方向移動に伴なって大径部２１ｂの両端間で流体を移動させるようにし、それにより可動コア２１の迅速な軸方向移動に寄与することができる。さらに可動コア２１の一端部には前記流路３０および前記凹部２９間を結ぶ連通孔３２が設けられるので、可動コア２１の軸方向移動に伴なう流体の移動をより円滑化し、それにより可動コア２１をより迅速に移動させることができる。
【００５０】
ソレノイド部１６が備える可動コア２１の他端には、弁部１５が備えるロッド５０の一端が当接するようにして、可動コア２１およびロッド５０を分離させており、これにより相互組付のために加工精度を高める必要がなく、また可動コア２１およびロッド５０の軸心が多少ずれたとしてもカラー２７およびガイド部５２で別々にガイドされる可動コア２１およびロッド５０の軸方向移動に悪影響が及ぶことはなく、したがってカラー２７、可動コア２１およびロッド５０の加工および組付を容易とし、コスト低減を図ることができる。
【００５１】
また弁部１５の弁ハウジング４８が、ソレノイド部１６のヨーク板１９に設けられた複数の連結孔５４…を介してボビン２３に一体に連なるようにして、前記弁ハウジング４８、ボビン２３およびヨーク板１９が一体にモールド結合されるので、ボビン２３、ヨーク板１９および弁ハウジング４８の軸心精度を容易に向上することができる。
【００５２】
しかも半径方向内方に張出す内向き鍔２７ｂが前記カラー２７の他端に一体に設けられ、該内向き鍔２７ｂを軸方向移動可能に貫通する前記ロッド５０の一端が、カラー２７内で可動コア２１の他端に同軸に当接されるので、ロッド５０によりカラー２７の他端側がほぼ塞がれることになり、塵埃がカラー２７内に侵入することを極力防止することができる。
【００５３】
さらにロッド５０の一端には、該ロッド５０の軸線上を仮想中心とする球面状の当接面５０ｂが形成され、該当接面５０ｂが前記可動コア２１の他端に当接されるので、軸線とはずれた方向の力が可動コア２１からロッド５０に及んでも、ロッド５０の軸方向移動に影響が及ばないようにすることができる。
【００５４】
ところでボビン２３の一端部には、ソレノイドハウジング１８の端壁部１８ａに対向して開口する収容凹部４４が設けられ、コイル２４に連なって収容凹部４４に収容されるアース板４３と、前記端壁部１８ａとの間に、コイル組立体１７をヨーク板１９側に付勢するばね力を発揮する導電金属製のばね４５が設けられている。これによりコイル組立体１７をソレノイドハウジング１８内で安定的に保持するためのばね４５を用いてソレノイドハウジング１８にアース板４３を導通させ、ソレノイドハウジング１８を接地するようにして、アース用の端子部材を設けることを不要とし、部品点数を低減することができる。
【００５５】
弁部１５において、弁ハウジング４８の弁座部材５３を嵌合、固定するにあたり、一端に第２弁座６４を有した弁座部材５３の他端には半径方向外方に張出す規制鍔部５３ａが設けられており、弁ハウジング４８には、弁座部材５３の嵌合時に規制鍔部５３ａに当接して弁座部材５３の嵌合方向移動端を規制する段部６５が設けられている。このため弁座部材５３を弁ハウジング４８に嵌合、固定した状態で、第２弁座６４と、弁ハウジング４８の段部６５とは軸方向にずれた位置に配置されることになり、第２弁座６４および規制鍔部５３ａ間の長さを変更するだけで、弁ハウジング４８の長さおよび形状の多様化に対応した第２弁座６４の位置設定が可能となり、汎用性を高めることができる。
【００５６】
また第２弁座６４はテーパ状に形成されており、球状である弁体４９の第２弁座６４への着座性を向上し、閉弁時に安定した着座状態を維持することができる。
【００５７】
弁座部材５３を嵌合させるために、弁ハウジング４８の他端側には、ソレノイド部１６のソレノイドハウジング１８とは反対側に開口する嵌合孔５６が可動コア２１の軸線と同軸にして設けられ、該嵌合孔５６の中間部内面に形成される環状の前記段部６５に前記規制鍔部５３ａを当接させて嵌合孔５６に嵌合される弁座部材５３の外周に、嵌合孔５６の内面に弾発的に接触するＯリング６６が装着されており、弁室５８および外部間のシール性を維持しつつ弁座部材５３を弁ハウジング４８に嵌合することができる。
【００５８】
さらに弁座部材５３には、一端を第２弁座６４の中央部に開口させた第２弁孔６３が軸方向全長にわたって設けられ、第２弁孔６３の他端を臨ませるフィルタ６７の外周部が弁座部材５３の規制鍔部５３ａを前記段部６５との間に挟んで配置され、該フィルタ６７の外周部に弁ハウジング４８の他端がかしめ係合されるので、弁座部材５３およびフィルタ６７の弁ハウジング４８への組付けを容易とすることができる。
【００５９】
フィルタ６７は、リング状に形成される枠部材６８の内周に網状部材６９が支持されて成るものであり、第２弁孔６３の他端部には、大径端を枠部材６８の内径に対応させつつ前記フィルタ６７側に向かうにつれて大径となるテーパ孔部６３ａが同軸に設けられており、フィルタ６７のうち網状部材６９のほぼ全体を流体が流通するようにして流体の流通抵抗を抑えることができる。
【００６０】
図５および図６は本発明の第２実施例を示すものであり、図５は図４に対応した弁部の縦断面図、図６は図５の６−６線断面図である。
【００６１】
弁ハウジング４８に嵌合、固定された弁座部材５３′の一端には、該弁座部材５３の一端を臨ませる弁室５８に収容されている球状の弁体４９に、弁座部材５３′の軸線まわりの複数箇所たとえば４箇所で接触する弁体ガイド部７０，７０…が一体に連設される。
【００６２】
この第２実施例によれば、上記第１実施例の効果に加えて、弁体４９を第１および第２弁座６２，６４に精度良く案内することができる。
【００６３】
図７は上記第２実施例の変形例を示すものであり、弁座部材５３′の周方向に沿う弁体ガイド部７０′，７０′…の長さを、図６で明示した弁体ガイド部７０，７０…よりも大きく設定してもよい。
【００６４】
以上、本発明の実施例を説明したが、本発明は上記実施例に限定されるものではなく、特許請求の範囲に記載された本発明を逸脱することなく種々の設計変更を行うことが可能である。
【００６５】
【発明の効果】
以上のように本発明によれば、可動コアおよびロッドが分離しているので、相互組付のために加工精度を高める必要はなく、また可動コアおよびロッドの軸心が多少ずれたとしても、カラーおよびガイド部で別々にガイドされる可動コアおよびロッドの軸方向移動に悪影響が及ぶことはなく、したがってカラー、可動コアおよびロッドの加工および組付を容易とし、コスト低減を図ることができ、しかもボビン、ヨーク板および弁ハウジングが一体に成形されるので、ボビン、ヨーク板および弁ハウジングの軸心精度を容易に向上することができる。
【００６６】
また特に前記カラーは、ボビン中心孔の内面に対向する外向き鍔を軸方向一端に、また内向き鍔を軸方向他端にそれぞれ一体に有してヨーク板の貫通孔に圧入され、また可動コアは、カラー内に摺動可能に挿入される小径部と、カラーの軸方向一端よりも外方で前記小径部の一端に同軸に連設されて該小径部よりも大径に形成され且つボビンの中心孔内で固定コアに対向する大径部とを一体に備え、前記内向き鍔を軸方向移動可能に貫通する前記ロッドの一端が、該カラー内で可動コアの小径部端面に同軸に当接されるので、可動コアのカラー内での摺動には影響を及ぼさない外向き鍔を用いてカラーをヨーク板の貫通孔に圧入することが可能となって、肉厚を極力薄く設定したカラーを貫通孔に圧入することを可能とし、それにより可動コアおよびヨーク板間の間隔を極力小さく設定して磁気特性を向上することが可能となるとともに、可動コアの軸方向移動をヨーク板に固定されるカラーで安定的にガイドすることができ、しかもロッドでカラーの他端側がほぼ塞がれることになり、塵埃がカラー内に侵入することを極力防止することができる。また、外向き鍔付きカラーがボビンの中心孔に挿入されるにもかかわらず、可動コアおよび固定コアの対向面積を比較的大きく設定し、磁気特性を向上させることができる。
【００６７】
請求項２の発明によれば、カラーの軸線が傾くことを極力防止することができ、またヨーク板のうちカラーを介して可動コアの外面に対向する部分の面積を大きくし、磁路面積の増大による磁気特性向上を図ることができる。
【００６８】
請求項３の発明によれば、コイル組立体をソレノイドハウジング内で安定的に保持するためのばねを用いてソレノイドハウジングにアース板を導通させ、ソレノイドハウジングを接地するようにして、アース用の端子部材を設けることを不要とし、部品点数を低減することができる。
【００６９】
請求項４の発明によれば、コイル組立体とは別体のカプラをハウジングの端壁部外面側に取付けることができるので、カプラ形状の変更にもかかわらず、カプラを除く部分の変更を不要として汎用性を高めることができ、しかもソレノイドハウジングの軸線に直交する平面内での該ソレノイドハウジングに対するボビンすなわちコイル組立体の位置を一定に定めることができ、またソレノイドハウジングの軸線に直交する平面内でのコイル組立体に対するカプラの位置を一定に定めることができ、剛性を有するソレノイドハウジングの端部外面にカプラを強固にかつ安定して固定することができる。
【００７０】
請求項５の発明によれば、第２弁座および規制鍔部間の長さを変更するだけで、弁ハウジングの長さおよび形状の多様化に対応した第２弁座の位置設定が可能となり、汎用性を高めることができる。
【００７１】
さらに請求項６の発明によれば、弁座部材およびフィルタの弁ハウジングへの組付けを容易とすることができる。
【図面の簡単な説明】
【図１】第１実施例の三方電磁弁の縦断面図である。
【図２】図１の２−２線拡大断面図である。
【図３】ソレノイド部の分解斜視図である。
【図４】図２の下部の拡大図である。
【図５】第２実施例の図４に対応した弁部の縦断面図である。
【図６】図５の６−６線断面図である。
【図７】第２実施例の変形例を示すための図６に対応した断面図である。
【符号の説明】
１４・・・三方電磁弁
１７・・・コイル組立体
１８・・・ソレノイドハウジング
１８ａ・・・端壁部
１９・・・ヨーク板
１９ａ・・・円筒部
２０・・・固定コア
２１・・・可動コア
２１ａ・・・小径部
２１ｂ・・・大径部
２２・・・中心孔
２３・・・ボビン
２４・・・コイル
２６・・・貫通孔
２７・・・カラー
２７ａ・・・外向き鍔
２７ｂ・・・内向き鍔
３５・・・端子部材
３６・・・カプラ
３７・・・カプラ支持板
３８・・・透孔
４０・・・連結軸部
４１・・・溶着孔
４３・・・アース板
４４・・・収容凹部
４５・・・ばね
４８・・・弁ハウジング
４９・・・弁体
５０・・・ロッド
５２・・・ガイド部
５３・・・弁座部材
５３ａ・・・規制鍔部
５４・・・連結孔
５５・・・ガイド孔
５６・・・嵌合孔
５７・・・隔壁
５８・・・弁室
６１・・・第１弁孔
６２・・・第１弁座
６３・・・第２弁孔
６４・・・第２弁座
６５・・・段部
６７・・・フィルタ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a three-way solenoid valve, and more particularly, a coil assembly is housed in a solenoid housing having an end wall portion at one end and made of magnetic metal, and a magnetic metal yoke facing the other end of the coil assembly. A valve in which a plate is coupled to the other end of the solenoid housing, a collar made of a non-magnetic material for guiding the axial movement of the movable core is disposed through the central portion of the yoke plate, and one end is connected to the yoke plate In the valve body, the first and second valve seats facing the valve chamber in the valve housing are provided opposite to each other in the housing, and the valve body capable of alternative seating on the first and second valve seats, The present invention relates to an improvement of a three-way solenoid valve in which a rod linked to and connected to a movable core is connected.
[0002]
[Prior art]
Conventionally, such a three-way solenoid valve is already well known, for example, in Japanese Patent Application Laid-Open No. 3-157576. In this case, one end of a rod is coaxially fitted to a movable core guided in the axial direction by a collar. ing.
[0003]
[Problems to be solved by the invention]
However, in the conventional three-way solenoid valve, since the movable core and the rod are substantially integrated, and the axial movement of only the movable core is guided, the axial center position of the rod is the movable core. In order to ensure the smooth axial movement of the movable core and rod within the collar and valve housing, it will be affected by the coaxiality of the rod and the axial center position accuracy of the collar that guides the movable core. The machining accuracy and assembly accuracy of the collar that guides the movable core, the movable core and the rod must be increased, resulting in an increase in cost.
[0004]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a three-way solenoid valve that facilitates processing and assembly of a collar, a movable core, and a rod, and enables cost reduction.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to a first aspect of the present invention, there is provided a coil assembly including a synthetic resin bobbin having a central hole and a coil wound around the bobbin, and has an end wall portion at one end. A fixed core housed in a solenoid housing made of magnetic metal and magnetically coupled to the end wall portion is inserted into one end side of the center hole, and a movable core facing the fixed core is in addition to the center hole. A magnetic metal yoke plate, which is inserted on the end side and has a through hole in the center and faces the other end of the coil assembly, is coupled to the other end of the solenoid housing and has one end facing the fixed core. A collar made of a non-magnetic material that guides the axial movement of the movable core is inserted into the other end side of the center hole through the through hole, and one end of the collar is connected to the yoke plate. Formed in the valve housing A first valve body and a second valve seat facing the valve chamber are provided opposite to each other, and an alternative seating on the first and second valve seats is enabled, In a three-way solenoid valve in which a rod connected to and connected to a movable core is connected, the valve housing made of synthetic resin that is integrally connected to the bobbin through a plurality of connection holes provided in the yoke plate, A guide portion is provided for guiding the movement in the axial direction, and the collar protrudes outward in the radial direction to face the inner surface of the center hole, and extends inward in the radial direction. A flange is integrally provided at the other axial end and is press-fitted into the through-hole, and the movable core is slidably inserted into the collar, and has a smaller diameter than the one axial end of the collar. The small diameter portion is coaxially connected to one end of the small diameter portion. With remote facing the stationary core with a large diameter is formed on and said central hole and a large-diameter portion integral one end of said rod through said inward flange axially movable is within said collar It is coaxially contacted with the end surface of the small diameter portion .
[0006]
According to such a configuration, since the movable core and the rod are separated from each other, there is no need to increase the processing accuracy for mutual assembly, and even if the axis of the movable core and the rod is slightly shifted, the collar and the rod There is no adverse effect on the axial movement of the movable core and the rod that are separately guided by the guide portion. Therefore, the machining and assembly of the collar, the movable core and the rod can be facilitated, and the cost can be reduced. Moreover, since the bobbin, the yoke plate and the valve housing are integrally formed, the axial center accuracy of the bobbin, the yoke plate and the valve housing can be easily improved.
[0007]
The collar has an outward flange facing the inner surface of the bobbin center hole integrally at one end in the axial direction and an inward flange at the other axial end, and is press-fitted into the through hole of the yoke plate. A small-diameter portion that is slidably inserted into the collar, and is coaxially connected to one end of the small-diameter portion outside the one end in the axial direction of the collar, and has a larger diameter than the small-diameter portion and a bobbin And a large-diameter portion facing the fixed core in the central hole of the rod, and one end of the rod penetrating the inward flange so as to be axially movable is coaxial with the end surface of the small-diameter portion of the movable core in the collar. Because it abuts, it is possible to press-fit the collar into the through hole of the yoke plate using an outwardly facing flange that does not affect sliding within the collar of the movable core, and set the wall thickness as thin as possible Can be press-fitted into the through-hole, thereby moving the movable core It becomes possible to improve the magnetic properties by setting minimize the spacing of the fine yoke plates, stably can guide axial movement of the movable core in a color that is fixed to the yoke plate, yet rod Thus, the other end of the collar is almost blocked, and dust can be prevented from entering the collar as much as possible. Moreover, despite the fact that the collar with an outward hook is inserted into the center hole of the bobbin, the facing area of the movable core and the fixed core can be set relatively large, and the magnetic characteristics can be improved.
[0008]
According to a second aspect of the invention, in addition to the configuration of the first aspect of the invention, a cylindrical portion forming a part of the through hole is opposite to the coil assembly at the central portion of the yoke plate. According to such a configuration, the axis of the collar is inclined so as to support the collar over a relatively long distance in the axial direction at the cylindrical portion integral with the yoke plate. The area of the yoke plate facing the outer surface of the movable core through the collar can be increased as much as possible, and the magnetic characteristics can be improved by increasing the magnetic path area.
[0009]
According to a third aspect of the present invention, in addition to the configuration of the first aspect of the invention, an end of the bobbin is provided with a housing recess that opens to face the end wall of the solenoid housing, A conductive metal spring that exerts a spring force that biases the coil assembly toward the yoke plate is provided between the ground plate that is continuously accommodated in the accommodating recess and the end wall portion. According to such a configuration, the grounding terminal is connected to the solenoid housing by using the spring for stably holding the coil assembly in the solenoid housing, and the solenoid housing is grounded. It is unnecessary to provide them, and the number of parts can be reduced.
[0010]
According to a fourth aspect of the invention, in addition to the configuration of the first aspect of the invention, a connecting shaft portion that tightly penetrates the through hole provided in the end wall portion is integrally connected to the bobbin. A coupler support plate that is in contact with the outer surface of the end wall portion is formed integrally with a synthetic resin coupler that faces a terminal member connected to the coil, and is inserted through a welding hole provided in the coupler support plate. The connecting shaft portion and the coupler support plate are welded. According to such a configuration, a coupler separate from the coil assembly can be attached to the outer surface side of the end wall portion of the housing. Regardless of the change, it is possible to improve versatility by eliminating the need to change the portion excluding the coupler. In addition, since the connecting shaft portion tightly penetrates the through hole provided in the end wall portion of the housing, the position of the bobbin, that is, the coil assembly with respect to the solenoid housing in a plane perpendicular to the axis of the solenoid housing is fixed. In addition, the terminal member is fitted to the coupler so that the position of the coupler relative to the coil assembly can be fixed within a plane perpendicular to the axis of the solenoid housing, and the rigid outer surface of the end of the solenoid housing The coupler can be firmly and stably fixed.
[0011]
According to a fifth aspect of the present invention, in addition to the configuration of the first aspect of the present invention, the valve housing has a guide hole having one end coaxially connected to the through hole, and a coaxial hole within the guide hole. A first valve hole for loosely inserting the other end of the rod to be disposed, a partition having a first valve seat facing the center of the first valve hole on the opposite side of the guide hole, and the partition through the guide hole And a fitting hole having a stepped portion facing the opposite side of the partition wall, and having a second valve seat at one end and being disposed at the other end. The valve seat member provided with a regulating flange that projects outward in the radial direction forms the valve chamber between the partition wall and the fitting so that the regulating collar is brought into contact with the stepped portion. The valve seat member is fitted to and fixed to the hole. The second valve seat and the stepped portion of the valve housing are arranged at a position shifted in the axial direction in a state of being fitted and fixed to the ring, and the length between the second valve seat and the regulating flange is increased. Only by changing, the position of the second valve seat corresponding to diversification of the length and shape of the valve housing can be set, and versatility can be enhanced.
[0012]
Furthermore, in the invention according to claim 6 , in addition to the configuration of the invention according to claim 5 , the valve seat member has a second valve hole whose one end is opened at a central portion of the second valve seat. An outer peripheral portion of the filter facing the other end of the second valve hole is disposed with a restriction flange portion of the valve seat member interposed between the stepped portion and the outer periphery of the filter housing. The ends are caulked and engaged, and according to such a configuration, the valve seat member and the filter can be easily assembled to the valve housing.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on the embodiments of the present invention shown in the accompanying drawings.
[0014]
1 to 4 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a three-way solenoid valve, FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. 1, and FIG. FIG. 4 is an exploded perspective view, and FIG. 4 is an enlarged view of the lower part of FIG.
[0015]
In FIG. 1, this three-way solenoid valve 14 communicates an inlet passage 11 connected to a fluid supply source (not shown) with an outlet passage 12 connected to a fluid pressure actuator (not shown) and a reservoir (not shown). A valve portion 15 that operates so as to switch between a state in which the discharge passage 13 and the outlet passage 12 connected to each other are cut off, and a state in which the passage between the inlet passage 11 and the outlet passage 12 is cut off and the communication between the discharge passage 13 and the outlet passage 12 is switched; , And a solenoid portion 16 that exerts electromagnetic force for switching the valve portion 15.
[0016]
Referring to FIGS. 2 and 3 together, the solenoid portion 16 includes a coil assembly 17, a magnetic metal solenoid housing 18 that houses the coil assembly 17, and a magnetic metal member that is coupled to the solenoid housing 18. Yoke plate 19, a fixed core 20 formed integrally with the solenoid housing 18, and a movable core 21 facing the fixed core 20.
[0017]
The coil assembly 17 includes a synthetic resin bobbin 23 having a center hole 22, a coil 24 wound around the bobbin 23, and a covering portion 25. The covering portion 25 is made of, for example, a synthetic resin tape. A coil 24 wound around a bobbin 23 is wound around.
[0018]
The solenoid housing 18 has an end wall portion 18a facing one end in the axial direction of the coil assembly 17 integrally formed at one end, and is formed in a bottomed cylindrical shape. One end of the fixed core 20 to be inserted is connected to the central portion of the end wall portion 18 a of the solenoid housing 18, for example, so as to be magnetically coupled to the solenoid housing 18.
[0019]
The yoke plate 19 has a through hole 26 corresponding to the center hole 22 at the center and faces the other end of the coil assembly 17, and the outer periphery of the yoke plate 19 faces the other end of the solenoid housing 18. They are connected by caulking or the like. In addition, a cylindrical portion 19 a that forms a part of the through hole 26 is integrally provided at the center of the yoke plate 19 so as to protrude to the opposite side of the coil assembly 17.
[0020]
The axial movement of the movable core 21 is guided by a cylindrical collar 27 made of a nonmagnetic material such as stainless steel, and the collar 27 passes through the through hole 26 and is press-fitted into the through hole 26. Then, it is inserted into the other end side of the center hole 22. One end of the collar 27 is integrally provided with an outward flange 27a that projects radially outward and faces the inner surface of the center hole 22, and the other end of the collar 27 projects inward in the radial direction. An orientation rod 27b is provided integrally.
[0021]
On the other hand, the movable core 21 is integrally provided with a small-diameter portion 21 a inserted into the collar 27 and a large-diameter portion 21 b that has a larger diameter than the small-diameter portion 21 a and faces the other end of the fixed core 20. The large-diameter portion 21b is coaxially connected to one end of the small-diameter portion 21a outside the one end in the axial direction of the collar 27. A concave portion 29 that accommodates a part of a return spring 28 provided between the movable core 21 and the fixed core 20 is provided coaxially at one end of the movable core 21.
[0022]
Further, on the outer surface of the large-diameter portion 21b, for example, a plurality of strips are provided so that a groove 31 forming a flow path 30 between the inner surface of the central hole 22 extends over the entire length in the axial direction of the large-diameter portion 21b. A communication hole 32 connecting the flow path 30 and the recess 29 is provided in the movable core 21.
[0023]
A coupler 36 made of a synthetic resin is arranged outside the solenoid housing 18 so as to face a terminal member 35 extending from the bobbin 23 and connected to one end of a coil 24 included in the coil assembly 17. 36 is formed integrally with a disk-shaped coupler support plate 37 that is in contact with the outer surface of the end wall portion 18 a of the solenoid housing 18.
[0024]
The end wall portion 18 a of the solenoid housing 18 is provided with a pair of through holes 38 and 38 and a terminal through hole 39, and one end of, for example, a pair of connecting shaft portions 40 and 40 that penetrates both the through holes 38 and 38. The bobbin 23 is integrally connected. On the other hand, the coupler support plate 37 is provided with a pair of welding holes 41, 41 corresponding to the through holes 38, 38, and these welding holes 41, 41 are opposite to the end wall portion 18 a. The end portions are provided with tapered portions 41a and 41a that become larger in diameter as they move away from the end wall portion 18a.
[0025]
The connecting shaft portions 40, 40 are inserted into the welding holes 41, 41, respectively, and the other end portion of each connecting shaft portion 40, 40 and the coupler support plate 37 are connected to the connecting shaft portions 40, 40. Heat welding is performed so that the portions protruding from the two welding holes 41, 41 are crushed in the axial direction.
[0026]
In addition, the two sets of welding holes 41 and 41 and the connecting shaft portions 40 and 40 are arranged at positions where the coupler 36 is sandwiched between them.
[0027]
The base portion on the bobbin 23 side of the terminal member 35 is covered with a synthetic resin covering portion 42 that is formed integrally with the bobbin 23 and fitted into the terminal through hole 39. The terminal member 35 is substantially L-shaped. And is fitted to the coupler 36.
[0028]
A ring-shaped ground plate 43 connected to the other end of the coil 24 included in the coil assembly 17 is housed in a housing recess 44 provided on the outer surface of one end of the bobbin 23, and the ground plate 44 and the end wall portion 18a. In the meantime, a spring 45 is provided that presses the coil assembly 17 toward the yoke plate 19 to keep the position of the coil assembly 17 in the solenoid housing 18 constant. Moreover, the spring 45 is formed of a conductive metal, and the ground plate 43 is electrically connected to the solenoid housing 18 via the spring 45. Further, a bracket 46 for supporting the solenoid housing 18 on a metal support member (not shown) is welded to the solenoid housing 18, and the other end of the coil 24 is connected to the ground plate 43, the spring 45, the solenoid housing 18, and the bracket. 46 and the support member are grounded.
[0029]
Referring also to FIG. 4, the valve portion 15 includes a synthetic resin valve housing 48, a spherical valve body 49 accommodated in the valve housing 48, the movable core 21 of the solenoid portion 16, and the valve body 49. And a rod 50 that interlocks and connects the two.
[0030]
One end of the valve housing 48 is integrally connected to the bobbin 23 of the coil assembly 17 in the solenoid unit 16. That is, the yoke plate 19 is provided with a plurality of connecting holes 54, 54..., And the valve housing 48 integrally connected to the bobbin 23 through the connecting holes 54, 54. The yoke plate 19 sandwiched between the two is molded and joined together.
[0031]
The valve housing 48 includes a guide hole 55 having one end coaxially connected to the through hole 26 of the yoke plate 19 included in the solenoid portion 16, and the first valve hole 61 coaxial with the guide hole 55 and the opposite side of the guide hole 55. The partition wall 57 having the first valve seat 62 that faces the first valve hole 61 at the center and the partition wall 57 interposed between the other end of the guide hole 55 are arranged coaxially with the guide hole 55. In addition, a step portion 65 facing the side opposite to the partition wall 57 is provided with a fitting hole 56 formed on the inner surface of the end portion opposite to the partition wall 57.
[0032]
The rod 50 is coaxially arranged in the guide hole 55, and a small diameter shaft portion 50 a provided at the other end of the rod 50 is loosely inserted into the first valve hole 61. A metal cylindrical member that functions as a guide portion 52 that guides the axial movement of the rod 50 is press-fitted in the guide hole 55, and the flow path 34 is valved to the entire axial length of the outer periphery of the cylindrical member. For example, a plurality of grooves 52 a are provided so as to be formed between the housing 48 and an open chamber 59 communicating with the discharge passage 13 is formed in the valve housing 48 between the yoke plate 19 and the guide portion 52 of the solenoid portion 16. Is done.
[0033]
By the way, the other end of the collar 27 in the solenoid portion 16 is integrally provided with an inward flange 27b extending radially inward at the other end of the collar 27, and penetrates the inward flange 27b so as to be movable in the axial direction. One end of the rod 50 is abutted coaxially with the other end of the movable core 21 in the collar 27. In addition, a spherical contact surface 50b having an imaginary center on the axis of the rod 50 is formed at one end of the rod 50, and the contact surface 50b contacts the other end of the movable core 21.
[0034]
A valve seat member 53 having a tapered second valve seat 64 at one end and a restricting flange portion 53a extending outward in the radial direction at the other end defines the valve chamber 58 communicating with the outlet passage 12 as the partition wall 57. And an O-ring 66 that is fitted into the fitting hole 56 so as to abut the regulating flange 53a on the stepped portion 64 and elastically contacts the inner surface of the fitting hole 56. Mounted on the outer periphery of the member 53.
[0035]
The valve chamber 58 accommodates a spherical valve body 49 that can be alternatively seated on the first and second valve seats 62 and 64, and the small-diameter shaft portion 50 a of the rod 50 that loosely penetrates the first valve hole 61 serves as a valve. It contacts the body 49.
[0036]
The valve seat member 53 is provided with a second valve hole 63 having one end opened in the central portion of the second valve seat 64 over the entire length in the axial direction, and is interposed between the second valve hole 63 and the inlet passage 11 to be second. An outer peripheral portion of the filter 67 that faces the other end of the valve hole 63 is disposed with a restriction flange portion 53a of the valve seat member 53 interposed between the step portion 65 and the valve housing 48 on the outer peripheral portion of the filter 67. The other end of the screw is caulked and engaged by heat caulking or the like. As a result, the valve seat member 53 fitted into the fitting hole 56 is fixed to the valve housing 48.
[0037]
The filter 67 is configured such that a mesh member 69 is supported on the inner periphery of a ring-shaped frame member 68, and the large-diameter end is set to the inner diameter of the frame member 68 at the other end of the second valve hole 63. A tapered hole portion 63a formed so as to increase in diameter toward the filter 67 side while correspondingly is provided coaxially.
[0038]
By the way, the valve seat member 53 is made of metal or synthetic resin. When the valve seat member 53 is made of metal, the shape accuracy of the second valve seat 64 of the second valve seat 64 is increased, and the seat When the valve seat member 53 made of synthetic resin is used, the valve seat member 53 can be easily manufactured and the cost can be reduced.
[0039]
Next, the operation of the first embodiment will be described. When the coil 24 of the solenoid portion 16 is energized, the movable core 21 is attracted to the fixed core 20 side against the spring force of the return spring 28. Therefore, in a state where fluid pressure is acting on the second valve hole 63 from the inlet passage 11 via the filter 67, the valve body 49 is pushed up so as to separate from the second valve seat 64, and the first valve seat is Sitting on 62. Therefore, the second valve hole 63 is opened and the first valve hole 61 is closed, the inlet passage 11 communicates with the outlet passage 12, and the outlet passage 12 and the discharge passage 13 are blocked.
[0040]
On the other hand, when energization of the coil 24 of the solenoid unit 16 is stopped, the movable core 21 operates in a direction away from the fixed core 20 by the spring force of the return spring 28. For this reason, the valve body 49 is pressed by the rod 50 so as to be separated from the first valve seat 62 and to be seated on the second valve seat 64. Accordingly, the first valve hole 61 is opened and the second valve hole 63 is closed, the outlet passage 12 communicates with the discharge passage 13, and the outlet passage 12 and the inlet passage 11 are blocked.
[0041]
In such a three-way solenoid valve 14, in the solenoid portion 16, one end of the connecting shaft portions 40 and 40 made of synthetic resin passing through the through holes 38 and 38 provided in the end wall portion 18 a of the solenoid housing 18 is provided. A coupler support plate 37 connected to the bobbin 23 and formed integrally with the coupler 36 separate from the coil assembly 17 and abutted against the outer surface of the end wall portion 18a, and a welding hole 41 of the coupler support plate 37 , 41 are welded to the other end portions of the connecting shaft portions 40, 40, and the terminal member 35 penetrating the terminal through hole 39 of the end wall portion 18a is fitted into the coupler 36. Therefore, the coupler 36 separate from the coil assembly 17 can be attached to the outer surface side of the end wall portion 18a of the solenoid housing 18, and it is not necessary to change the portion excluding the coupler 36 despite the change in the shape of the coupler 36. Versatility can be improved. Moreover, since the connecting shaft portions 40 and 40 and the bobbin 23 are integrally formed, it is possible to avoid an increase in the number of parts and an increase in the number of assembling steps due to the provision of the connecting shaft portions 40 and 40.
[0042]
Further, when welding the coupler support plate 37 and the connecting shaft portions 40, 40, portions of the connecting shaft portions 40, 40 protruding from the welding holes 41, 41 are crushed in the axial direction and thermally welded to the coupler support plate 37. Therefore, it is possible to weld the coupler support plate 37 and the connecting shaft portions 40 and 40 without using expensive welding equipment and jigs such as ultrasonic welding, and use inexpensive equipment and jigs by thermal welding. Can do. At this time, since the taper portions 41a and 41a having larger diameters are provided at the end portions of the welding holes 41 and 41 opposite to the end wall portion 18a, the diameter of the welding holes 41 and 41 increases as the distance from the end wall portion 18a increases. , 41 in the direction orthogonal to the axial direction can be increased.
[0043]
Moreover, since the connecting shaft portions 40, 40 pass through the through holes 38, 38 provided in the end wall portion 18a of the solenoid housing 18, the bobbin 23 with respect to the solenoid housing 18 in the plane perpendicular to the axis of the solenoid housing 18, that is, The position of the coil assembly 17 can be fixed, and the position of the coupler 36 relative to the coil assembly 17 can be determined in a plane perpendicular to the axis of the solenoid housing 18 by fitting the terminal member 35 to the coupler 36. The coupler 36 can be firmly and stably fixed to the outer surface of the end wall portion 18a of the solenoid housing 18 having rigidity.
[0044]
Further, since the two pairs of welding holes 41 and 41 and the connecting shaft portions 40 and 40 that are paired with each other are disposed at a position sandwiching the coupler 36 therebetween, the outer surface of the end wall portion 18a of the solenoid housing 18 is provided. Since the coupler support plate 37 is formed in a disc shape, the load strength of the coupler 36 in the entire circumferential direction of the solenoid housing 18 can be increased. .
[0045]
Further, the base part on the bobbin 23 side of the terminal member 35 is covered with a synthetic resin covering part 42 that is formed integrally with the bobbin 23 and is fitted into the terminal through hole 39, and between the terminal member 35 and the solenoid housing 18. The guide part 42 can be used for positioning the bobbin 23 and the coupler 36 with respect to the solenoid housing 18 while achieving insulation, and coupled with the connecting shaft parts 40 and 40 passing through the through holes 38 and 38 of the solenoid housing 18, The positioning of the bobbin 23 and the coupler 36 with respect to the solenoid housing 18 can be made stronger.
[0046]
Further, a collar 27 made of a non-magnetic material that guides the movement of the movable core 21 in the axial direction is press-fitted into the through-hole 26 so as to pass through the through-hole 26 provided in the central portion of the yoke plate 19, and radially outward. Since the outward flange 27a that protrudes in the direction and faces the inner surface of the center hole 22 of the bobbin 23 is integrally provided at one end of the collar 27, it does not affect the sliding of the movable core 21 within the collar 27. It becomes possible to press-fit the collar 27 into the through-hole 26 of the yoke plate 19 using the outward flange 27a. By doing so, it is possible to press-fit the collar 27 whose thickness is set as thin as possible into the through-hole 26. As a result, it is possible to improve the magnetic characteristics by setting the distance between the movable core 21 and the yoke plate 19 as small as possible, and the axial movement of the movable core 21 is fixed to the yoke plate 19. It can be stably guide collar 27.
[0047]
A cylindrical portion 19a that forms a part of the through hole 26 is provided at the center of the yoke plate 19 so as to protrude to the opposite side of the coil assembly 17, and the cylindrical portion 19a that is integral with the yoke plate 19 is provided. Thus, it is possible to prevent the axis of the collar 27 from tilting as much as possible by supporting the collar 27 over a relatively long distance in the axial direction, and to the outer surface of the movable core 21 via the collar 27 of the yoke plate 19. It is possible to increase the area of the facing portion and improve the magnetic characteristics by increasing the magnetic path area.
[0048]
The movable core 21 has a small-diameter portion 21a inserted into the collar 27 and a larger diameter than the small-diameter portion 21a and is opposed to the other end of the fixed core 20 from one end in the axial direction of the collar 27. And a large-diameter portion 21b that is coaxially connected to one end of the small-diameter portion 21a on the outside and is integrated with the movable core in spite of the collar 27 being inserted into the center hole 22 of the bobbin 23. 21 and the fixed area of the fixed core 20 are set to be relatively large, and coupled with the area of the yoke plate 19 facing the outer surface of the movable core 21 via the collar 27, the magnetic characteristics are further improved. be able to.
[0049]
A concave portion 29 for accommodating a part of a return spring 28 provided between the movable core 21 and the fixed core 20 is provided coaxially at one end portion of the movable core 21, and a large-diameter portion is provided at one end side of the movable core 21. Despite the provision of 21b, the movable core 21 can be reduced in weight, and the movable core 21 can be quickly moved in the axial direction. Moreover, since the groove | channel 31 which forms the flow path 30 between the inner surfaces of the center hole 22 is provided in the outer surface of the large diameter part 21b so that it may extend over the axial direction full length of the large diameter part 21b, the movable core 21 The fluid is moved between both ends of the large-diameter portion 21b along with the axial movement of the movable core 21b, thereby contributing to the rapid axial movement of the movable core 21. Furthermore, since a communicating hole 32 that connects between the flow path 30 and the recess 29 is provided at one end of the movable core 21, the movement of the fluid accompanying the movement of the movable core 21 in the axial direction is made smoother, thereby making the movable core 21 movable. The core 21 can be moved more quickly.
[0050]
The movable core 21 and the rod 50 are separated from each other so that one end of the rod 50 provided in the valve portion 15 is in contact with the other end of the movable core 21 provided in the solenoid unit 16. There is no need to increase the processing accuracy, and even if the axes of the movable core 21 and the rod 50 are slightly shifted, the axial movement of the movable core 21 and the rod 50 separately guided by the collar 27 and the guide portion 52 is adversely affected. Therefore, the processing and assembly of the collar 27, the movable core 21 and the rod 50 can be facilitated, and the cost can be reduced.
[0051]
Further, the valve housing 48 of the valve portion 15 is integrally connected to the bobbin 23 via a plurality of connecting holes 54 provided in the yoke plate 19 of the solenoid portion 16 so that the valve housing 48, the bobbin 23 and the yoke plate are connected. Since 19 is integrally molded, the axial center accuracy of the bobbin 23, the yoke plate 19 and the valve housing 48 can be easily improved.
[0052]
In addition, an inward flange 27b extending radially inward is provided integrally with the other end of the collar 27, and one end of the rod 50 penetrating the inward flange 27b so as to be movable in the axial direction is movable in the collar 27. Since the other end of the core 21 is coaxially contacted, the other end side of the collar 27 is almost blocked by the rod 50, and dust can be prevented from entering the collar 27 as much as possible.
[0053]
Furthermore, a spherical contact surface 50b having an imaginary center on the axis of the rod 50 is formed at one end of the rod 50, and the contact surface 50b contacts the other end of the movable core 21. Even if a force in a direction deviating from the movable core 21 is applied to the rod 50, the axial movement of the rod 50 can be prevented from being affected.
[0054]
By the way, one end portion of the bobbin 23 is provided with a housing recess 44 that opens to face the end wall portion 18a of the solenoid housing 18, and is connected to the coil 24 and accommodated in the housing recess 44, and the end wall. A conductive metal spring 45 is provided between the portion 18a and the coil assembly 17 to exert a spring force that biases the coil assembly 17 toward the yoke plate 19 side. As a result, the ground plate 43 is electrically connected to the solenoid housing 18 using the spring 45 for stably holding the coil assembly 17 in the solenoid housing 18, and the solenoid housing 18 is grounded. Is unnecessary, and the number of parts can be reduced.
[0055]
In the valve portion 15, when fitting and fixing the valve seat member 53 of the valve housing 48, the other end of the valve seat member 53 having the second valve seat 64 at one end is protruded radially outwardly. 53a is provided, and the valve housing 48 is provided with a step portion 65 that abuts the restriction flange 53a when the valve seat member 53 is fitted and restricts the moving end of the valve seat member 53 in the fitting direction. . For this reason, in a state where the valve seat member 53 is fitted and fixed to the valve housing 48, the second valve seat 64 and the step portion 65 of the valve housing 48 are disposed at positions shifted in the axial direction. The position of the second valve seat 64 corresponding to diversification of the length and shape of the valve housing 48 can be set only by changing the length between the two valve seats 64 and the restricting flange 53a, and the versatility is improved. Can do.
[0056]
Further, the second valve seat 64 is formed in a tapered shape, so that the seating property of the spherical valve body 49 to the second valve seat 64 can be improved, and a stable seating state can be maintained when the valve is closed.
[0057]
In order to fit the valve seat member 53, the other end side of the valve housing 48 is provided with a fitting hole 56 that opens on the opposite side to the solenoid housing 18 of the solenoid portion 16 so as to be coaxial with the axis of the movable core 21. The restriction flange 53a is brought into contact with the annular stepped portion 65 formed on the inner surface of the intermediate portion of the fitting hole 56, and is fitted on the outer periphery of the valve seat member 53 fitted into the fitting hole 56. An O-ring 66 that elastically contacts the inner surface of the joint hole 56 is mounted, and the valve seat member 53 can be fitted into the valve housing 48 while maintaining a sealing property between the valve chamber 58 and the outside.
[0058]
Further, the valve seat member 53 is provided with a second valve hole 63 having one end opened at the center of the second valve seat 64 over the entire length in the axial direction, and the outer periphery of the filter 67 facing the other end of the second valve hole 63. Since the other end of the valve housing 48 is caulked and engaged with the outer peripheral portion of the filter 67, the valve seat member 53 is disposed between the valve 67 and the stepped portion 65. And the assembly of the filter 67 to the valve housing 48 can be facilitated.
[0059]
The filter 67 is formed by supporting a mesh member 69 on the inner periphery of a ring-shaped frame member 68, and the second valve hole 63 has a large-diameter end at the inner diameter of the frame member 68. A taper hole 63a having a diameter increasing toward the filter 67 side is provided coaxially, and the flow resistance of the fluid is reduced by allowing the fluid to flow through substantially the entire mesh member 69 of the filter 67. Can be suppressed.
[0060]
5 and 6 show a second embodiment of the present invention. FIG. 5 is a longitudinal sectional view of a valve portion corresponding to FIG. 4, and FIG. 6 is a sectional view taken along line 6-6 of FIG.
[0061]
A valve seat member 53 ′ accommodated in a valve chamber 58 accommodated in a valve chamber 58 facing one end of the valve seat member 53 is fitted to one end of the valve seat member 53 ′ fitted and fixed to the valve housing 48. , Which are in contact with each other at a plurality of locations around the axis, for example, at four locations, are integrally connected.
[0062]
According to the second embodiment, in addition to the effects of the first embodiment, the valve body 49 can be accurately guided to the first and second valve seats 62 and 64.
[0063]
FIG. 7 shows a modification of the second embodiment. The length of the valve body guide portions 70 ′, 70 ′,... Along the circumferential direction of the valve seat member 53 ′ is shown in FIG. You may set larger than the part 70,70 ....
[0064]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.
[0065]
【The invention's effect】
As described above, according to the present invention, since the movable core and the rod are separated from each other, it is not necessary to increase the processing accuracy for mutual assembly, and even if the axes of the movable core and the rod are slightly shifted, There is no adverse effect on the axial movement of the movable core and rod, which are separately guided by the collar and the guide part, so that the processing and assembly of the collar, movable core and rod can be facilitated and the cost can be reduced. Moreover, since the bobbin, the yoke plate and the valve housing are integrally formed , the axial center accuracy of the bobbin, the yoke plate and the valve housing can be easily improved.
[0066]
In particular, the collar has an outward flange facing the inner surface of the bobbin center hole at one end in the axial direction and an inward flange at the other axial end, and is press-fitted into the through hole of the yoke plate, and is movable. The core has a small-diameter portion that is slidably inserted into the collar, is coaxially connected to one end of the small-diameter portion outside the one end in the axial direction of the collar, and has a larger diameter than the small-diameter portion. One end of the rod that is integrally provided with a large-diameter portion facing the fixed core in the central hole of the bobbin and that penetrates the inward flange so as to be axially movable is coaxial with the end surface of the small-diameter portion of the movable core in the collar It is possible to press the collar into the through hole of the yoke plate using an outwardly facing flange that does not affect the sliding of the movable core within the collar, and the wall thickness is made as thin as possible the set color it possible to press-fit into the through hole, whereby the movable co It is possible to improve the magnetic characteristics by setting the distance between the yoke plate and the yoke plate as small as possible, and the axial movement of the movable core can be stably guided by the collar fixed to the yoke plate, and the rod Thus, the other end of the collar is almost blocked, and dust can be prevented from entering the collar as much as possible . Moreover, despite the fact that the collar with an outward hook is inserted into the center hole of the bobbin, the facing area of the movable core and the fixed core can be set relatively large, and the magnetic characteristics can be improved .
[0067]
According to the second aspect of the present invention, the axis of the collar can be prevented from being tilted as much as possible, and the area of the yoke plate facing the outer surface of the movable core via the collar is increased, so that the magnetic path area is reduced. The magnetic characteristics can be improved by the increase.
[0068]
According to the third aspect of the present invention, the grounding terminal is electrically connected to the solenoid housing using the spring for stably holding the coil assembly in the solenoid housing, and the solenoid housing is grounded. It is unnecessary to provide a member, and the number of parts can be reduced.
[0069]
According to the fourth aspect of the present invention, a coupler separate from the coil assembly can be attached to the outer surface of the end wall portion of the housing. The position of the bobbin, that is, the coil assembly with respect to the solenoid housing in a plane orthogonal to the axis of the solenoid housing can be fixed, and the plane orthogonal to the axis of the solenoid housing can be determined. Thus, the position of the coupler relative to the coil assembly can be fixed, and the coupler can be firmly and stably fixed to the outer surface of the end of the rigid solenoid housing.
[0070]
According to the fifth aspect of the present invention, it is possible to set the position of the second valve seat corresponding to diversification of the length and shape of the valve housing only by changing the length between the second valve seat and the restriction flange. , Can increase versatility.
[0071]
Furthermore, according to the invention of claim 6 , the valve seat member and the filter can be easily assembled to the valve housing.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a three-way solenoid valve according to a first embodiment.
FIG. 2 is an enlarged cross-sectional view taken along line 2-2 of FIG.
FIG. 3 is an exploded perspective view of a solenoid unit.
4 is an enlarged view of the lower part of FIG. 2. FIG.
FIG. 5 is a longitudinal sectional view of a valve portion corresponding to FIG. 4 of the second embodiment.
6 is a cross-sectional view taken along line 6-6 of FIG.
FIG. 7 is a cross-sectional view corresponding to FIG. 6 for illustrating a modification of the second embodiment.
[Explanation of symbols]
14 ... three-way solenoid valve 17 ... coil assembly 18 ... solenoid housing 18a ... end wall 19 ... yoke plate 19a ... cylindrical part 20 ... fixed core 21 ... movable Core 21a ... Small diameter part 21b ... Large diameter part 22 ... Center hole 23 ... Bobbin 24 ... Coil 26 ... Through hole 27 ... Collar 27a ... Outward flange 27b ..Inward flange 35 ... Terminal member 36 ... Coupler 37 ... Coupler support plate 38 ... Through hole 40 ... Connecting shaft 41 ... Welding hole 43 ... Ground plate 44 ..Housing recess 45 ... Spring 48 ... Valve housing 49 ... Valve element 50 ... Rod 52 ... Guide part 53 ... Valve seat member 53a ... Regulator flange 54 ... Connecting hole 55 ... guide hole 56 ... fitting hole 57 ... partition wall 58 ... valve chamber 61 ... The first valve hole 62 ... first valve seat 63 ... second valve hole 64 ... second valve seat 65 ... stepped portion 67 ... filter

Claims

A coil assembly (17) having a synthetic resin bobbin (23) having a center hole (22) and a coil (24) wound around the bobbin (23) has an end wall (18a) at one end. A fixed core (20) housed in a solenoid housing (18) made of magnetic metal and magnetically coupled to the end wall (18a) is inserted into one end of the center hole (22), A movable core (21) facing the fixed core (20) is inserted into the other end of the center hole (22), and has a through hole (26) in the center, and the coil assembly (17). A magnetic metal yoke plate (19) facing the end is coupled to the other end of the solenoid housing (18) to guide the axial movement of the movable core (21) having one end opposed to the fixed core (20). The collar (27) made of non-magnetic material A valve housing (48) that passes through the through hole (26) and is inserted into the other end of the central hole (22) and is connected to the yoke plate (19) is connected to the valve housing (48). The first and second valve seats (62, 64) facing the valve chamber (58) formed on the first and second valve seats (62, 64) are provided so as to oppose each other. In a three-way solenoid valve in which a rod (50) linked to and connected to the movable core (21) is connected to a valve body (49) accommodated in the valve chamber (58) so as to be seated.
Axial movement of the rod (50) to the valve housing (48) made of synthetic resin integrally connected to the bobbin (23) via a plurality of connecting holes (54) provided in the yoke plate (19). Is provided with a guide part (52) for guiding
The collar (27) extends outward in the radial direction and has an outward flange (27a) facing the inner surface of the center hole (22) at one end in the axial direction and inward flange (27b) extending radially inward. ) At the other end in the axial direction and are press-fitted into the through hole (26),
The movable core (21) includes a small-diameter portion (21a) that is slidably inserted into the collar (27), and the small-diameter portion (21a) outside the one end in the axial direction of the collar (27). A large-diameter portion (21b) that is coaxially connected to one end, has a larger diameter than the small-diameter portion (21a), and faces the fixed core (20) in the central hole (22) is integrally provided. ,
One end of the rod (50) penetrating the inward flange (27b) so as to be movable in the axial direction is abutted coaxially with the end surface of the small diameter portion (21a) in the collar (27). Three-way solenoid valve.

At the center of the yoke plate (19), a cylindrical portion (19a) forming a part of the through hole (26) is provided integrally with the coil assembly (17) so as to protrude on the opposite side. The three-way solenoid valve according to claim 1 .

One end of the bobbin (23) is provided with an accommodation recess (44) that opens to face the end wall (18a) of the solenoid housing (18), and is connected to the coil (24). 44) between the ground plate (43) housed in 44) and the end wall portion (18a), a conductive metal that exerts a spring force that biases the coil assembly (17) toward the yoke plate (19). 3. A three-way solenoid valve according to claim 1, further comprising a spring (45) made of metal.

A connecting shaft portion (40) tightly penetrating a through hole (38) provided in the end wall portion (18a) is integrally connected to the bobbin (23), and is connected to the coil (24). 35), a coupler support plate (37) that is in contact with the outer surface of the end wall portion (18a) is formed integrally with the coupler (36) made of synthetic resin, and is provided on the coupler support plate (37). The three-way solenoid valve according to claim 1, wherein the connecting shaft portion (40) inserted into the welded hole (41) and the coupler support plate (37) are welded.

The valve housing (48) includes a guide hole (55) having one end coaxially connected to the through hole (26) and the rod (50) disposed coaxially in the guide hole (55). A first valve hole (61) for loosely inserting the other end and a partition wall (57) having a first valve seat (62) facing the center of the first valve hole (61) on the side opposite to the guide hole (55) And the partition wall (57) interposed between the other end of the guide hole (55) and disposed coaxially with the guide hole (55) and facing the opposite side of the partition wall (57) ( 65) having a fitting hole (56), a valve seat member having a second valve seat (64) at one end and a restricting flange (53a) projecting radially outward at the other end. (53) forms the valve chamber (58) between the partition wall (57) and the step (65 The restricting flange portion so as to abut the (53a) fitted to the fitting hole (56), three-way electromagnetic valve according to claim 1, characterized in that it is fixed to.

The valve seat member (53) is provided with a second valve hole (63) having one end opened at the center of the second valve seat (64) over the entire length in the axial direction. An outer peripheral portion of the filter (67) facing the end is disposed with a restriction flange portion (53a) of the valve seat member (53) sandwiched between the step portion (65), and the outer periphery of the filter (67) The three-way solenoid valve according to claim 5, wherein the other end of the valve housing (48) is caulked and engaged.