JP3863763B2

JP3863763B2 - Hydraulic control device

Info

Publication number: JP3863763B2
Application number: JP2001357724A
Authority: JP
Inventors: 浩二箱田; 弘大山
Original assignee: Keihin Corp
Current assignee: Keihin Corp
Priority date: 2001-11-22
Filing date: 2001-11-22
Publication date: 2006-12-27
Anticipated expiration: 2021-11-22
Also published as: JP2003156173A

Description

【０００１】
【発明の属する技術分野】
本発明は、パイロット室への液圧の作用・解放に応じて出力ポートの入力ポートおよび解放ポートへの連通、遮断を択一的に切換えるスプール弁と、パイロット室に入力ポートから液圧を作用せしめる状態ならびに前記パイロット室の液圧を解放する状態を択一的に切換える電磁三方弁とを含む液圧制御装置の改良に関する。
【０００２】
【従来の技術】
従来、かかる液圧制御装置は、たとえば実開昭５０−１５４２２号公報等で既に知られている。
【０００３】
【発明が解決しようとする課題】
ところが、上記従来のものでは、スプール弁と、電磁三方弁とが同軸上に配置されており、液圧制御装置が、スプール弁および電磁三方弁の軸方向に著しく大きくなってしまう。またスプール弁が備える解放ポートとは別の液圧解放ポートが、パイロット室の液圧を解放するために電磁三方弁側に設けられており、液圧制御装置外に作動液を開放、排出したくない場合には、２つの解放ポートに何らかの管路接続を施さねばならず、コスト上昇を招く原因となる。
【０００４】
本発明は、かかる事情に鑑みてなされたものであり、スプール弁の軸線に沿う方向での小型化を可能とするとともに、作動液の排出に伴うコスト増を回避し得るようにした液圧制御装置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の発明は、一端をパイロット室に臨ませるとともに該パイロット室の容積を縮少させる方向にばね付勢されたスプールが、出力ポートを入力ポートおよび解放ポートに択一的に連通させることを可能としてバルブボディに摺動自在に嵌合されて成るスプール弁と；前記パイロット室に通じて弁ハウジング内に形成される弁室に前記入力ポートから液圧を作用せしめる状態ならびに前記弁室の液圧を解放する状態を択一的に切換えるように作動する弁体が収納されて成る弁部と、前記弁体を駆動する電磁力を発揮するソレノイド部とで構成される電磁三方弁と；を含む液圧制御装置において、前記スプール弁のバルブボディには、前記スプールを摺動自在に嵌合せしめる摺動孔と、その摺動孔の軸線と平行に延びるとともに閉塞端側に向かうにつれて順次小径となる有底の収納孔と、前記弁部の弁室から解放される液圧を導くようにして前記解放ポートに通じる液圧解放路とが設けられ、前記弁部の弁ハウジングは、前記収納孔に嵌合、固定されるべく段付きの円筒状に形成され、弁ハウジングの前記収納孔への挿入時に収納孔の内面に摺接するシール部材の個数が段階的に増加するようにして、複数の環状シール部材が弁ハウジングの外周の軸方向に間隔をあけた位置に装着され、その複数の環状シール部材は、前記挿入時に小径のものほど先に収納孔内面に摺接することを特徴とする。
【０００６】
このような請求項１の発明の構成によれば、スプール弁および電磁三方弁をそれらの軸線が平行になるようにしてバルブボディに配設することができるので、スプール弁および電磁三方弁の軸線に沿う方向でバルブボディすなわち液圧制御装置の小型化を図ることができる。しかも電磁三方弁における弁部の弁室から解放される液圧を導く液圧解放路がスプール弁の解放ポートに通じるようにしてバルブボディに設けられるので、電磁三方弁側に特別に解放ポートを設けることが不要となり、液圧制御装置外に作動液を開放、排出したくない場合にも管路接続が１箇所ですみ、コスト上昇を招くことはない。また収納孔および弁ハウジングがともに段付きに形成されており、弁ハウジングの収納孔への挿入時に収納孔の内面に摺接するシール部材の個数が段階的に増加するので、収納孔の内面との摺接による押し込み荷重が段階的に増加することになり、弁ハウジングのバルブボディへの組付け性を良好とすることができる。しかもシール部材の弁ハウジングへの異常装着時や、弁ハウジングの斜め組付け時等には押し込み荷重の異常により組付け不良を容易に判定することができ、弁ハウジングを正確に収納孔に組み込むことができる。
【０００７】
また請求項２の発明は、上記請求項１記載の発明の構成に加えて、前記摺動孔は、前記バルブボディの一面に一端を開口した有底孔であり、前記摺動孔の一端部には、前記スプールの一端との間にパイロット室を形成するシールプラグが液密に圧入、固定されることを特徴とし、この構成によれば、スプールの一端を臨ませるパイロット室がシールプラグとスプールの一端との間に形成されており、シールプラグは圧入によりバルブボディに固定されるので、摺動孔の一端開口部を最小限の部品点数で液密に閉じることができる。
【０００８】
また請求項３の発明は、上記請求項１又は２の発明の構成に加えて、前記収納孔は、前記摺動孔の開口方向と同一側で開口するようにしてバルブボディに設けられ、該収納孔に嵌合、固定される弁部と協働して前記電磁三方弁を構成するソレノイド部に、前記シールプラグの少なくとも一部を覆って前記バルブボディの一面に締結される取付けステーが固着されることを特徴とし、かかる構成によれば、シールプラグの摺動孔からの離脱を確実に阻止することができる。すなわちシールプラグにはパイロット室の液圧が該シールプラグを摺動孔から抜け出させる方向で作用している。このためシールプラグの摺動孔への圧入、固定状態が万一不充分であった場合には、シールプラグが摺動孔から抜けてしまう側に移動してしまう可能性がある。しかるに電磁三方弁のソレノイド部をバルブボディの一面に取付けるための取付けステーで前記シールプラグの少なくとも一部が覆われるので、前記シールプラグが摺動孔から抜け出る方向に万一移動しようとしても、その移動が取付けステーで阻止され、シールプラグが摺動孔から抜けてしまうことはないのである。
【０００９】
請求項４の発明は、上記請求項３の発明の構成に加えて、前記シールプラグは、前記一面に接触した前記取付けステーとの間に間隔をあける位置まで前記摺動孔の一端部に液密に圧入されることを特徴とし、かかる構成によれば、バルブボディの一面に確実に締結した取付けステーで、プラグの摺動孔からの離脱を確実に阻止することができる。
【００１０】
請求項５の発明は、上記請求項４の発明の構成に加えて、シールプラグは、前記摺動孔の内面全周に弾発接触する環状のシール部材が外周に装着されるシール部と、該シール部に前記パイロット室とは反対側で同軸にかつ一体に連なってシール部よりも大径に形成される圧入部とを備え、前記圧入部が摺動孔に圧入されることを特徴とし、かかる構成によれば、シールプラグの摺動孔への圧入時に摺動孔の内面のうちシール部材に接触する部分が荒れてしまうことを回避して前記シール部材により確実なシールを可能とし、しかもシールプラグの圧入長さを比較的短くすることで圧入作業を容易とすることができる。
【００１１】
請求項６の発明は、上記請求項５の発明の構成に加えて、前記摺動孔の一端には、軸方向外方に向かうにつれて大径となる拡径部が設けられ、前記圧入部の外端が前記拡径部の内端よりも内方に位置するまで前記シールプラグが摺動孔の一端部に圧入されることを特徴とし、かかる構成によれば、シールプラグの摺動孔への圧入時に拡径部で案内することでシールプラグの摺動孔への圧入を容易とするこができるとともにシール部材が傷つくことを防止することができ、しかも圧入部の外端が前記拡径部の内端よりも内方に位置することにより、パイロット室の液圧によりプラグが抜け方向に移動しようとしたときに、圧入部の外端の周縁部が摺動孔の内面に食込み易くなり、シールプラグの摺動孔からの抜け出しをより確実に阻止することができる。
【００１２】
【発明の実施の形態】
以下、本発明の実施の形態を、添付の図面に示した本発明の一実施例に基づいて説明する。
【００１３】
図１〜図４は本発明の一実施例を示すものであり、図１は電磁三方弁が閉弁している状態での液圧制御装置の縦断面図であって図２の１−１線に沿う断面図、図２は図１の２矢視平面図、図３は図１の要部拡大図、図４は電磁三方弁における弁部の拡大縦断面図である。
【００１４】
先ず図１および図２において、この液圧制御装置は、たとえばエンジンＥにおける動弁装置の作動特性を変更するために液圧を高、低に切換えて前記動弁装置に作用せしめるものであり、エンジンＥのエンジン本体１１に締結されるバルブボディ１４を有するスプール弁１２と、該スプール弁１２が備えるパイロット室１５ならびにエンジン本体１１に内蔵される液圧ポンプ等の液圧源間に介在するようにして前記バルブボディ１４に取付けられる電磁三方弁１３とを備える。
【００１５】
スプール弁１２は、前記バルブボディ１４と、一端をパイロット室１５に臨ませてバルブボディ１４に摺動可能に嵌合されるスプール１６と、パイロット室１５の容積を縮少する方向にスプール１６を付勢するばね力を発揮してバルブボディ１４およびスプール１６間に設けられる第１戻しばね１７と、前記パイロット室１５をスプール１６の一端との間に形成するようにしてバルブボディ１４に液密に圧入されるシールプラグ１８とを備える。
【００１６】
エンジン本体１１に締結されたバルブボディ１４の外側面のうち上方の一面１４ａは平坦に形成されており、バルブボディ１４には、一端を前記一面１４ａに開口して上下にのびる有底の摺動孔２０と、該摺動孔２０の内側面の軸方向に間隔をあけた位置に開口する入力ポート２１、出力ポート２２および解放ポート２３と、前記摺動孔２０と平行にして上下に延びるとともに前記摺動孔２０の開口方向と同一側で開口する有底の収納孔２４とが設けられる。
【００１７】
入力ポート２１は、摺動孔２０の直径よりも大きな幅を有した矩形状の横断面形状を有するものであり、摺動孔２０の軸線に直交する平面内で摺動孔２０の下部を横断するようにしてバルブボディ１４に設けられ、該入力ポート２１の外端は、エンジン本体１１内の液圧源に接続されるべくエンジン本体１１側のバルブボディ１４の側面に開口され、入力ポート２１の開口端部にはフィルタ２５が装着される。また入力ポート２１の内端部はバルブボディ１４に設けられた連通孔２６により前記収納孔２４に連通される。而して入力ポート２１の中間部は摺動孔２０の下部内側面に開口するのであるが、該入力ポート２１の中間部は摺動孔２０内のスプール１６で遮断されることはなく、収納孔２４は、摺動孔２０内でのスプール１６の位置とは無関係に、連通孔２６および入力ポート２１を介してエンジン本体１１内の液圧源に連通される。
【００１８】
出力ポート２２は、摺動孔２０の軸線に沿って前記入力ポート２１の上方に間隔をあけた位置に配置されるものであり、摺動孔２０の軸線に直交する平面内で摺動孔２０の中間部を横断するようにしてバルブボディ１４に設けられ、該出力ポート２２の外端は、エンジンＥの動弁装置に接続されるべくエンジン本体１１側のバルブボディ１４の側面に開口される。
【００１９】
解放ポート２３は、摺動孔２０の軸線に沿って前記出力ポート２２の上方に間隔をあけた位置に配置されるものであり、摺動孔２０の軸線に直交する平面内で摺動孔２０の上部内側面に内端部を開口するようにしてバルブボディ１４に設けられ、該解放ポート２３の外端は、エンジン本体１１側に作動液を戻すべくエンジン本体１１側のバルブボディ１４の側面に開口される。
【００２０】
一端をパイロット室１５に臨ませて摺動孔２０に摺動可能に嵌合されるスプール１６の他端と、摺動孔２０の他端閉塞部との間にはばね室２８が形成され、第１戻しばね１７は、スプール１６の他端部および摺動孔２０の閉塞端部との間に設けられるようにしてばね室２８に収納される。
【００２１】
スプール１６の外周面には、出力ポート２２を入力ポート２１および解放ポート２３に択一的に切換えて連通せしめるための第１環状凹部３０と、解放ポート２３に常時通じる第２環状凹部３１とが設けられる。またスプール１６には、ばね室２８に通じる解放路３２が同軸に設けられるとともに、該解放路３２を第２環状凹部３１に通じさせる連通孔３３とが設けられ、ばね室２８は、解放路３２、連通孔３３および第２環状凹部３１を介して解放ポート２３に連通する。
【００２２】
パイロット室１５の液圧が低いときに、スプール１６は、図１で示すように、第１戻しばね１７のばね力によってパイロット室１５の容積を縮少した上限位置に在り、この状態で、スプール１６は出力ポート２２および入力ポート２１間を遮断するとともに第１環状凹部３０を介して出力ポート２２を解放ポート２３に連通させている。
【００２３】
パイロット室１５の液圧が高くなると、スプール１６は、第１戻しばね１７のばね力に抗してパイロット室１５の容積を増大した下限位置まで下動し、この状態で、スプール１６は出力ポート２２および解放ポート２３間を遮断するとともに第１環状凹部３０を介して出力ポート２２を入力ポート２１に連通させており、入力ポート２１に通じる出力ポート２２からの出力液圧が高圧となる。
【００２４】
パイロット室１５の液圧を解放すると、スプール１６は第１戻しばね１７のばね力により図１で示した上限位置へと戻ることになる。
【００２５】
図３において、シールプラグ１８は、摺動孔２０の内周面に弾発的に接触する環状のシール部材としてのＯリング３５が外周に装着されるシール部１８ａと、摺動孔２０に圧入されるべく前記シール部１８ａよりも大径に形成されてシール部１８ａに同軸にかつ一体に連設される圧入部１８ｂと、圧入部１８ｂよりも小径に形成されて圧入部１８ｂの前記シール部１８ａとは反対側に同軸にかつ一体に連設される小径部１８ｃとを備え、シール部１８ａを軸方向内方側に配置して摺動孔２０の一端部に圧入される。
【００２６】
一方、摺動孔２０の一端には、軸方向外方に向かうにつれて大径となるようにして彎曲した拡径部２０ａが設けられており、シールプラグ１８は、圧入部１８ｂの外端が拡径部２０ａの内端よりも内方に位置するまで摺動孔２０の一端部に圧入され、小径部１８ｃの外端はバルブボディ１４の一面１４ａよりもわずかに内方側に配置される。
【００２７】
図４を併せて参照して、電磁三方弁１３は、前記スプール弁１２のパイロット室１５に通じて弁ハウジング３８内に形成される弁室３９に前記入力ポート２１から液圧を作用せしめる状態ならびに前記弁室３９の液圧を解放する状態を択一的に切換えるように作動する弁体４０が収納されて成る弁部３６と、前記弁体４０を駆動する電磁力を発揮するソレノイド部３７とで構成される。
【００２８】
前記弁部３６の弁ハウジング３８は、バルブボディ１４の収納孔２４に嵌合、固定されるものであり、収納孔２４が、閉塞端側に向かうにつれて順次小径となるように形成されるのに応じて、弁ハウジング３８は段付きの円筒状に形成される。
【００２９】
収納孔２４は、一端を閉じるとともに連通孔２６が中間部内面に開口する第１孔部２４ａと、第１孔部２４ａよりも大径に形成されるとともに第１孔部２４ａの他端に一端が同軸に連なる第２孔部２４ｂと、第２孔部２４ｂよりも大径に形成されるとともに第２孔部２４ｂの他端に一端が同軸に連なる第３孔部２４ｃと、第３孔部２４ｃよりも大径に形成されるとともに第３孔部２４ｃの他端に一端が同軸に連なる第４孔部２４ｄと、小径端を第４孔部２４ｄの他端に同軸に連ならせたテーパ状の第５孔部２４ｅとから成り、第５孔部２４ｅの大径端がバルブボディ１４の上面に開口する。
【００３０】
一方、弁ハウジング３８は、磁性金属から成る段付き円筒状のハウジング主体４１と、該ハウジング主体４１に固定される円筒状の弁座部材４２とから成る。ハウジング主体４１は、収納孔２４の第２孔部２４ｂに嵌合し得る第１円筒部４１ａと、収納孔２４の第３孔部２４ｃに嵌合し得る第２円筒部４１ｂと、収納孔２４の第４孔部２４ｄに嵌合し得る第３円筒部４１ｃとを一体に備える。
【００３１】
しかも第１および第２円筒部４１ａ，４１ｂ間でハウジング主体４１の外周には第１環状溝４３が設けられ、第２および第３円筒部４１ｂ，４１ｃ間でハウジング主体４１の外周には第２環状溝４４が設けられる。
【００３２】
弁ハウジング３８すなわちハウジング主体４１の収納孔２４への嵌合時に、第１環状溝４３は、収納孔２４における第３孔部２４ｃの一端部内面との間で第１環状室４５を形成し、第２環状溝４４は、収納孔２４における第４孔部２４ｄの一端部内面との間で第２環状室４６を形成する。
【００３３】
またハウジング主体４１の第１、第２および第３円筒部４１ａ，４１ｂ，４１ｃの外周には、前記第１および第２環状室４５，４６を両側からシールするための環状のシール部材であるＯリング４７，４８，４９が装着されており、Ｏリング４７は第２孔部２４ｂの内周に弾発的に接触するようにして第１円筒部４１ａの外周に装着され、Ｏリング４８は第３孔部２４ｃの内周に弾発的に接触するようにして第２円筒部４１ｂの外周に装着され、Ｏリング４９は第４孔部２４ｄの内周に弾発的に接触するようにして第３円筒部４１ｃの外周に装着される。
【００３４】
しかも各Ｏリング４７〜４９は、弁ハウジング３８の前記収納孔２４への挿入時に収納孔２４の内面に摺接するＯリング４７〜４９の個数が段階的に増加するようにして、ハウジング主体４１の外周の軸方向に間隔をあけた位置に装着され、その場合に、複数のＯリング４７〜４９は、前記挿入時に小径のものほど先に収納孔２４内面に摺接する。
【００３５】
すなわち、図４で示すようにハウジング主体４１の収納孔２４への挿入が完了した状態で、第４孔部２４ｄの上端からＯリング４９の軸方向中心までの長さをＬとしたときに、第３孔部２４ｃの上端からＯリング４８の軸方向中心までの長さが２Ｌ、第２孔部２４ｂの上端からＯリング４７の軸方向中心までの長さが３Ｌとなるように、各Ｏリング４７〜４９のハウジング主体４１への装着位置が定められている。このようにすれば、ハウジング主体４１の収納孔２４への挿入時に、先ずＯリング４７が第２孔部２４ｂの内面に摺接し、次いでＯリング４７が第２孔部２４ｂの内面に摺接するとともにＯリング４８が第３孔部２４ｃの内面に摺接し、その後で、Ｏリング４７の第２孔部２４ｂの内面への摺接、Ｏリング４８の第３孔部２４ｃの内面への摺接、ならびにＯリング４９の第４孔部２４ｄの内面への摺接が同時に生じることになる。
【００３６】
ハウジング主体４１において第２円筒部４１ｂの軸方向中間部に対応した部分の内周には、弁座部５０が半径方向内方に張り出すようにして一体に設けられる。また弁座部材４２は、前記弁座部５０との間に弁室３９を形成するようにしてハウジング主体４１の下部に嵌合され、ハウジング主体４１の下端が弁座部材４２の下部にかしめ結合される。しかもハウジング主体４１に設けられた複数の通路孔５１…を介して弁室３９は第１環状室４５に連通しており、バルブボディ１４には第１環状室４５をスプール弁１２のパイロット室１５に通じさせる連通路５２が設けられる。
【００３７】
ところで弁ハウジング３８の収納孔２４への嵌合により、収納孔２４の閉塞端および弁ハウジング３８間には、連通孔２６を介して入力ポート２１に通じる入力室５４が形成されており、弁座部材４２は、前記入力室５４に通じる弁孔５５を形成してハウジング主体４１の下部に固定される。
【００３８】
一方、前記弁座部５０よりも上方でハウジング主体４１には円筒状の軸受部材５６が圧入されており、この軸受部材５６および弁座部５０間には解放室５７が形成される。しかも解放室５７はハウジング主体４１に設けられた複数の通路孔５８…を介して第２環状室４６に通じており、スプール弁１２の解放ポート２３に第２環状室４６を通じさせる液圧解放路５９がバルブボディ１４に設けられる。また弁座部５０の中央部には解放室５７に通じる弁孔６０が設けられる。
【００３９】
弁体４０は、球状に形成されるものであり、弁孔５５を中央部に開口させて弁室３９に臨むようにして弁座部材４２に形成される弁座６１に図４で示すように着座する状態と、弁孔６０を中央部に開口させて弁室３９に臨むようにして弁座部５０に形成される弁座６２に着座する状態とを択一的に切換えるようにして、弁室３９に収納される。而して弁体４０が弁座６１に着座した状態では弁室３９が弁孔６０を介して解放室５７に通じており、この状態ではスプール弁１２におけるパイロット室１５の液圧は解放される。また弁体４０が弁座６２に着座した状態では弁室３９が弁孔５５を介して入力室５４に通じており、この状態ではスプール弁１２におけるパイロット室１５に入力ポート２１の液圧が作用する。
【００４０】
ソレノイド部３７は、弁部３６におけるハウジング主体４１の上部に一体に設けられるフランジ部４１ｄに開口端がかしめ結合される有底円筒状のソレノイドハウジング６４と、該ソレノイドハウジング６４の閉塞端中央部に同軸にかつ一体に連設される有底円筒状の固定コア６５と、ソレノイドハウジング６４の閉塞端および前記フランジ部４１ｄ間に挟まれて固定コア６５を囲繞するボビン６６と、ボビン６６に巻装されるコイル６７と、ボビン６６およびハウジング主体４１の上部に同軸に挿入されて固定コア６５に対向する可動コア６８と、可動コア６８を固定コア６５から離反する側に付勢するばね力を発揮して固定コア６５および可動コア６８間に設けられる第２戻しばね６９とを備える。
【００４１】
ボビン６６と、該ボビン６６に巻装されるコイル６７とは、合成樹脂から成るモールド部７０で被覆される。このモールド部７０には、ソレノイドハウジング６４の開口端側側面に設けられた切欠き部６４ａから外方に突出するカプラ７０ａが一体に形成されており、このカプラ７０ａには、コイル６７に接続される端子７１…が配設される。
【００４２】
ソレノイドハウジング６４は一対の取付けステー７２，７３でバルブボディ１４に取付けられるものであり、両取付けステー７２，７３は、ソレノイドハウジング６４の外面に固着される支持板部７２ａ，７３ａと、バルブボディ１４の一面１４ａにボルト７４，７５により締結される締結板部７２ｂ，７３ｂとを一体に有して縦断面Ｌ字状に形成され、両取付けステー７２，７３のうち一方の取付けステー７３の締結板部７３ｂは、バルブボディ１４の摺動孔２０に圧入されているシールプラグ１８の少なくとも一部（この実施例では一部）を覆うように形成され、シールプラグ１８の小径部１８ｃの外端と、一面１４ａに締結された前記締結板部７３ｂとの間にはわずかな間隔が生じている。
【００４３】
ボビン６６のフランジ部４１ｄ側端部内周およびハウジング主体４１の上部間にはＯリング７６が介装され、またボビン６６およびソレノイドハウジング６４の閉塞端間には固定コア６５を同軸に囲繞するＯリング７７が介装される。
【００４４】
可動コア６８には、該可動コア６８を同軸に貫通する駆動軸７８がかしめ結合されており、該駆動軸７８は、軸受け部材５６を摺動可能に貫通する。しかも駆動軸７８には、弁座部５０の弁孔６０を緩く貫通する小径軸部７８ａが同軸にかつ一体に設けられており、この小径軸部７８ａの先端が弁室３９内の弁体４０に当接する。
【００４５】
このようなソレノイド部３７によれば、コイル６７への非通電状態にあっては第２戻しばね６９のばね力により可動コア６８は固定コア６５から離反しており、駆動軸７８は弁部３６の弁体４０を弁座６１に着座させており、パイロット室１５に通じる弁室３９は弁孔６２、解放室５７、通路孔５８…、第１環状室４５および液圧解放路５９を介して解放ポート２３に通じることになる。またコイル６７への通電状態にあっては第２戻しばね６９のばね力に抗して可動コア６８が固定コア６５側に吸着され、可動コア６８と一体の駆動軸７８の移動により弁体４０は弁座６２に着座することになり、パイロット室１５に通じる弁室３９は弁孔６１、入力室５４および連通孔２６を介して入力ポート２１に通じることになる。
【００４６】
次にこの実施例の作用について説明すると、スプール弁１２のバルブボディ１４には、バルブボディ１４の一面１４ａに一端を開口してスプール１６を摺動自在に嵌合せしめる有底の摺動孔２０と、電磁三方弁１３における弁部３６の弁ハウジング３８を嵌合、固定させて摺動孔２０の軸線と平行に延びる有底の収納孔２４とが設けられており、スプール弁１２および電磁三方弁１３をそれらの軸線が平行になるようにしてバルブボディ１４に配設することができるので、スプール弁１２および電磁三方弁１３の軸線に沿う方向でバルブボディ１４すなわち液圧制御装置の小型化を図ることができる。
【００４７】
またバルブボディ１４には、電磁三方弁１３における弁部３６の弁室３９から解放される液圧を導く液圧解放路５９が、スプール弁１２の解放ポート２３に通じるようにして設けられており、電磁三方弁１３側に特別に解放ポートを設けることが不要となり、液圧制御装置外に作動液を開放、排出したくない場合にも管路接続が１箇所ですみ、コスト上昇を招くことはない。
【００４８】
ところで、記摺動孔２０の一端部には、スプール１６の一端との間にパイロット室１５を形成するシールプラグ１８が液密に圧入、固定されるものであり、摺動孔２０の一端開口部を最小限の部品点数で液密に閉じることができる。
【００４９】
一方、有底の収納孔２４は、閉塞端側に向かうにつれて順次小径となるように形成され、弁部３６の弁ハウジング３８は、収納孔２４に嵌合、固定されるべく段付きの円筒状に形成され、弁ハウジング３８の収納孔２４への挿入時に収納孔２４の内面に摺接するＯリング４７〜４９の個数が段階的に増加するようにして、複数たとえば３つのＯリング４７〜４９が弁ハウジング３８の外周の軸方向に間隔をあけた位置に装着されている。したがって弁ハウジング３８の収納孔２４への挿入時には、収納孔２４の内面との摺接による押し込み荷重が段階的に増加することになり、弁ハウジング３８のバルブボディ１４への組付け性を良好とすることができる。しかもＯリング４７〜４９の弁ハウジング３８への異常装着時や、弁ハウジング３８の斜め組付け時等には押し込み荷重の異常により組付け不良を容易に判定することができ、弁ハウジング３８を正確に収納孔２４に組み込むことができる。
【００５０】
しかもスプール弁１２において、スプール１６の一端を臨ませるパイロット室１５が、バルブボディ１４に設けられた摺動孔２０の一端部に液密に圧入されるシールプラグ１８と前記スプール１６の一端との間に形成されるのであるが、シールプラグ１８にはパイロット室１５の液圧が該シールプラグ１８を摺動孔２０から抜け出させる方向で作用している。このためシールプラグ１８の摺動孔２０への圧入、固定状態が万一不充分であった場合には、シールプラグ１８が摺動孔２０から抜けてしまう側に移動してしまう可能性があるが、電磁三方弁１３のソレノイドハウジング６４をバルブボディ１４の一面１４ａに取付けるための取付けステー７３の締結板部７３ｂにより前記シールプラグ１８の少なくとも一部が覆われている。したがって前記シールプラグ１８が摺動孔２０から抜け出る方向に万一移動しようとしても、その移動が前記取付けステー７３の締結板部７３ｂで阻止され、シールプラグ１８が摺動孔２０から抜けてしまうことはない。
【００５１】
またシールプラグ１８は、バルブボディ１４の一面１４ａに接触した取付けステー７３の締結板部７３ｂとの間に間隔をあける位置まで摺動孔２０の一端部に液密に圧入されるので、バルブボディ１４の一面１４ａに確実に締結した取付けステー７３で、シールプラグ１８の摺動孔２０からの離脱を確実に阻止することができる。
【００５２】
しかもシールプラグ１８は、摺動孔２０の内周面に弾発的に接触するＯリング３５が外周に装着されるシール部１８ａと、前記摺動孔２０に圧入されるべく前記シール部１８ａよりも大径に形成されてシール部１８ａに同軸にかつ一体に連設される圧入部１８ｂと、圧入部１８ｂよりも小径に形成されて圧入部１８ｂの前記シール部１８ａとは反対側に同軸にかつ一体に連設される小径部１８ｃとを備えるものであり、このシールプラグ１８が、シール部１８ａを軸方向内方側に配置して前記摺動孔２０の一端部に圧入される。したがってシールプラグ１８の摺動孔２０への圧入時に摺動孔２０の内面のうちＯリング３５に接触する部分が荒れてしまうことがなく、前記Ｏリング３５による確実なシールが可能となり、シールプラグ１８の圧入長さを比較的短くすることで圧入作業を容易とすることができる。
【００５３】
さらに摺動孔２０の一端には、軸方向外方に向かうにつれて大径となる拡径部２０ａが設けられるので、シールプラグ１８の摺動孔２０への圧入時に拡径部２０ａで案内することでシールプラグ１８の摺動孔２０への圧入を容易とするこができるとともにＯリング３５が傷つくことを防止することができる。また圧入部１８ｂの外端が拡径部２０ａの内端よりも内方に位置するまでシールプラグ１８が摺動孔２０の一端部に圧入されることにより、パイロット室１５の液圧によりシールプラグ１８が抜け方向に移動しようとしたときに、圧入部１８ｂの外端の周縁部が摺動孔２０の内面に食込み易くなり、シールプラグ１８の摺動孔２０からの抜け出しをより確実に阻止することができる。
【００５４】
このようにシールプラグ１８を摺動孔２０の一端部に圧入したときに、シールシールプラグ１８が備える小径部１８ｃは拡径部２０ａに対応した位置に在り、圧入部１８ｂの外端の周縁部が摺動孔２０の内面に食込み易くなるようにした上で、シールプラグ１８の外端を取付けステー７３の締結板部７３ｂに近接対向させることが可能となる。
【００５５】
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。
【００５６】
たとえば上記実施例では、出力ポート２２と、入力ポート２１および解放ポート２３との連通、遮断を択一的に切換えるようにスプール弁１２を構成したが、一対の出力ポートと、入力ポートおよび解放ポートとの連通、遮断を一方の出力ポートが入力ポートに通じているときには他方の出力ポートを解放ポートに通じさせるようにして択一的に切換えるようにスプール弁を構成することも可能である。
【００５７】
【発明の効果】
以上のように本発明によれば、スプール弁および電磁三方弁の軸線に沿う方向でバルブボディすなわち液圧制御装置の小型化を図ることができ、電磁三方弁側に特別に解放ポートを設けることが不要となるので、液圧制御装置外に作動液を開放、排出したくない場合にも管路接続が１箇所ですみ、コスト上昇を招くことはない。また収納孔および弁ハウジングがともに段付きに形成されており、弁ハウジングの収納孔への挿入時に収納孔の内面に摺接するシール部材の個数が段階的に増加するので、収納孔の内面との摺接による押し込み荷重が段階的に増加することになり、弁ハウジングのバルブボディへの組付け性を良好とすることができる。しかもシール部材の弁ハウジングへの異常装着時や、弁ハウジングの斜め組付け時等には押し込み荷重の異常により組付け不良を容易に判定することができ、弁ハウジングを正確に収納孔に組み込むことができる。
【００５８】
また特に請求項２の発明によれば、摺動孔の一端開口部を最小限の部品点数で液密に閉じることができる。
【００５９】
また特に請求項３の発明によれば、シールプラグの摺動孔からの離脱を確実に阻止することができる。
【００６０】
また特に請求項４の発明によれば、バルブボディの一面に確実に締結した取付けステーで、プラグの摺動孔からの離脱を確実に阻止することができる。
【００６１】
また特に請求項５の発明によれば、シールプラグの摺動孔への圧入時に摺動孔の内面のうちシール部材に接触する部分が荒れてしまうことを回避してシール部材により確実なシールを可能とし、シールプラグの圧入長さを比較的短くすることで圧入作業を容易とすることができる。
【００６２】
請求項６の発明によれば、シールプラグの摺動孔への圧入を容易とするこができるとともにシール部材が傷つくことを防止することができ、しかもシールプラグの摺動孔からの抜け出しをより確実に阻止することができる。
【図面の簡単な説明】
【図１】電磁三方弁が閉弁している状態での液圧制御装置の縦断面図であって図２の１−１線に沿う断面図である。
【図２】図１の２矢視平面図である。
【図３】図１の要部拡大図である。
【図４】電磁三方弁における弁部の拡大縦断面図である。
【符号の説明】
１２・・・スプール弁
１３・・・電磁三方弁
１４・・・バルブボディ
１４ａ・・・バルブボディの一面
１５・・・パイロット室
１６・・・スプール
１８・・・シールプラグ
１８ａ・・・シール部
１８ｂ・・・圧入部
２０・・・摺動孔
２０ａ・・・拡径部
２１・・・入力ポート
２２・・・出力ポート
２３・・・解放ポート
２４・・・収納孔
３５，４７〜４９・・・シール部材としてのＯリング
３６・・・弁部
３７・・・ソレノイド部
３８・・・弁ハウジング
３９・・・弁室
４０・・・弁体
５９・・・液圧解放路
７３・・・取付けステー[0001]
BACKGROUND OF THE INVENTION
  The present invention includes a spool valve that selectively switches between communication and blocking of the input port and the release port of the output port according to the operation and release of the hydraulic pressure to the pilot chamber, and the hydraulic pressure from the input port to the pilot chamber. The present invention relates to an improvement in a hydraulic pressure control device including an electromagnetic three-way valve that selectively switches between a squeezing state and a state of releasing the hydraulic pressure in the pilot chamber.
[0002]
[Prior art]
  Conventionally, such a hydraulic pressure control device is already known, for example, in Japanese Utility Model Laid-Open No. 50-15422.
[0003]
[Problems to be solved by the invention]
  However, in the above-mentioned conventional one, the spool valve and the electromagnetic three-way valve are arranged coaxially, and the hydraulic pressure control device becomes extremely large in the axial direction of the spool valve and the electromagnetic three-way valve. In addition, a hydraulic pressure release port different from the release port provided in the spool valve is provided on the electromagnetic three-way valve side to release the hydraulic pressure in the pilot chamber, and the hydraulic fluid is released and discharged outside the hydraulic pressure control device. If not, some pipeline connection must be made to the two release ports, which causes an increase in cost.
[0004]
  The present invention has been made in view of such circumstances, and is capable of downsizing in the direction along the axis of the spool valve and is capable of avoiding an increase in cost associated with the discharge of hydraulic fluid. An object is to provide an apparatus.
[0005]
[Means for Solving the Problems]
  In order to achieve the above object, the invention of claim 1 is characterized in that a spool biased in a direction in which one end faces the pilot chamber and the volume of the pilot chamber is reduced, the output port is connected to the input port and the release port. A spool valve that is slidably fitted to the valve body so as to be able to communicate with the valve body; and hydraulic pressure from the input port to the valve chamber formed in the valve housing through the pilot chamber A valve portion that houses a valve body that operates to selectively switch between a state of acting and a state of releasing the hydraulic pressure in the valve chamber, and a solenoid portion that exerts an electromagnetic force that drives the valve body A hydraulic pressure control device comprising: an electromagnetic three-way valve; and a valve body of the spool valve,in frontFit the spool slidably.SlidingMoving holes,ThatExtends parallel to the axis of the sliding holeIn addition, the diameter gradually decreases toward the closed end.A bottomed storage hole and a hydraulic pressure release path that leads to the release port so as to guide the hydraulic pressure released from the valve chamber of the valve portion;The valve housing of the valve portion is formed in a stepped cylindrical shape to be fitted and fixed to the storage hole, and the number of seal members that are in sliding contact with the inner surface of the storage hole when inserted into the storage hole of the valve housing is A plurality of annular seal members are mounted at axially spaced positions on the outer periphery of the valve housing so as to increase in stages, and the plurality of annular seal members are stored earlier as the smaller diameter is inserted. Touch the inner surface of the holeIt is characterized by that.
[0006]
  According to the configuration of the first aspect of the present invention, the spool valve and the electromagnetic three-way valve can be arranged in the valve body so that their axes are parallel to each other. The valve body, that is, the hydraulic pressure control device can be downsized in the direction along the direction. In addition, since the hydraulic pressure release path that guides the hydraulic pressure released from the valve chamber of the valve part of the electromagnetic three-way valve is provided in the valve body so as to communicate with the release port of the spool valve, a special release port is provided on the electromagnetic three-way valve side. It is not necessary to provide this, and even when it is not desired to open and discharge the hydraulic fluid outside the hydraulic pressure control device, only one pipe connection is required, and the cost is not increased.Further, both the storage hole and the valve housing are stepped, and the number of seal members slidably contacting the inner surface of the storage hole when inserted into the storage hole of the valve housing increases stepwise. The pushing load due to the sliding contact increases step by step, and the ease of assembling the valve housing to the valve body can be improved. In addition, when the seal member is abnormally attached to the valve housing, or when the valve housing is installed at an angle, it is possible to easily determine the assembly failure due to an abnormal pushing load, and the valve housing can be accurately incorporated into the storage hole. Can do.
[0007]
  According to a second aspect of the invention, in addition to the structure of the first aspect of the invention, the sliding hole is a bottomed hole having one end opened on one surface of the valve body, and one end of the sliding hole. Is characterized in that a seal plug that forms a pilot chamber between the one end of the spool is press-fitted and fixed in a liquid-tight manner.A pilot chamber that faces one end of the spool is formed between the seal plug and one end of the spool, and the seal plug is fixed to the valve body by press-fitting. Can be liquid-tightly closed.
[0008]
  And claims3The invention of claim 1Or 2In addition to the configuration of the invention, the storage hole is provided in the valve body so as to open on the same side as the opening direction of the sliding hole, and cooperates with a valve portion fitted and fixed to the storage hole. A mounting stay that covers at least a part of the seal plug and is fastened to one surface of the valve body is fixed to the solenoid portion that constitutes the electromagnetic three-way valve. Separation of the plug from the sliding hole can be reliably prevented. That is, the hydraulic pressure in the pilot chamber acts on the seal plug in a direction that causes the seal plug to escape from the sliding hole. For this reason, if the press-fitted and fixed state of the seal plug into the sliding hole is insufficient, there is a possibility that the seal plug moves to the side where it comes out of the sliding hole. However, since at least a part of the seal plug is covered with a mounting stay for mounting the solenoid portion of the electromagnetic three-way valve on one surface of the valve body, even if the seal plug should move in the direction of coming out of the sliding hole, The movement is prevented by the mounting stay, and the seal plug does not come out of the sliding hole.
[0009]
  Claim4The invention of claim 13In addition to the configuration of the invention, the seal plug is liquid-tightly press-fitted into one end of the sliding hole up to a position spaced from the mounting stay in contact with the one surface. According to the configuration, the attachment stay that is securely fastened to one surface of the valve body can reliably prevent the plug from being detached from the sliding hole.
[0010]
  Claim5The invention of claim 14In addition to the configuration of the invention, the seal plug includes a seal portion on which an annular seal member elastically contacting the entire inner periphery of the sliding hole is mounted on the outer periphery, and the seal portion on the side opposite to the pilot chamber A press-fit portion that is coaxially and integrally connected to be larger in diameter than the seal portion, and the press-fit portion is press-fitted into the sliding hole. The portion of the inner surface of the sliding hole that comes into contact with the seal member during the press-fitting into the moving hole is prevented from becoming rough, and the seal member enables reliable sealing, and the press-fitting length of the seal plug is relatively short. By doing so, the press-fitting work can be facilitated.
[0011]
  Claim6The invention of claim 15In addition to the configuration of the invention, at one end of the sliding hole, a diameter-enlarged portion that increases in diameter toward the outer side in the axial direction is provided, and the outer end of the press-fit portion is more than the inner end of the enlarged-diameter portion. The seal plug is press-fitted into one end portion of the sliding hole until it is positioned inward, and according to such a configuration, when the seal plug is pressed into the sliding hole, the seal plug is guided by the enlarged diameter portion. It is possible to facilitate the press-fitting of the seal plug into the sliding hole and to prevent the seal member from being damaged, and the outer end of the press-fit portion is located inward of the inner end of the enlarged diameter portion. As a result, when the plug is about to move in the removal direction due to the hydraulic pressure in the pilot chamber, the peripheral edge of the outer end of the press-fit portion is likely to bite into the inner surface of the slide hole, and the seal plug does not come out of the slide hole. It can be blocked more reliably.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.
[0013]
  1 to 4 show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view of a hydraulic pressure control device in a state where an electromagnetic three-way valve is closed, which is 1-1 in FIG. 2 is a plan view taken in the direction of the arrow 2 in FIG. 1, FIG. 3 is an enlarged view of the main part of FIG. 1, and FIG. 4 is an enlarged vertical sectional view of the valve portion of the electromagnetic three-way valve.
[0014]
  First, in FIG. 1 and FIG. 2, this hydraulic pressure control device switches the hydraulic pressure between high and low in order to change the operating characteristics of the valve operating device in the engine E, for example, and acts on the valve operating device. A spool valve 12 having a valve body 14 fastened to the engine body 11 of the engine E, a pilot chamber 15 provided in the spool valve 12, and a hydraulic pressure source such as a hydraulic pump built in the engine body 11 are interposed. And an electromagnetic three-way valve 13 attached to the valve body 14.
[0015]
  The spool valve 12 includes the valve body 14, a spool 16 slidably fitted to the valve body 14 with one end facing the pilot chamber 15, and the spool 16 in a direction to reduce the volume of the pilot chamber 15. The first return spring 17 provided between the valve body 14 and the spool 16 by exerting an urging spring force and the pilot chamber 15 is formed between the one end of the spool 16 and the valve body 14 is liquid-tight. And a seal plug 18 that is press-fitted into the housing.
[0016]
  The upper surface 14a of the outer surface of the valve body 14 fastened to the engine body 11 is formed flat, and the valve body 14 has a bottomed slide extending upward and downward with one end opened to the one surface 14a. A hole 20, an input port 21, an output port 22, and a release port 23 that open at axially spaced positions on the inner surface of the sliding hole 20, and extend vertically in parallel with the sliding hole 20. A bottomed storage hole 24 that opens on the same side as the opening direction of the sliding hole 20 is provided.
[0017]
  The input port 21 has a rectangular cross-sectional shape having a width larger than the diameter of the sliding hole 20 and crosses the lower part of the sliding hole 20 in a plane perpendicular to the axis of the sliding hole 20. Thus, the outer end of the input port 21 is opened on the side surface of the valve body 14 on the engine body 11 side so as to be connected to the hydraulic pressure source in the engine body 11. A filter 25 is attached to the opening end of the filter. The inner end of the input port 21 is communicated with the storage hole 24 through a communication hole 26 provided in the valve body 14. Thus, although the intermediate portion of the input port 21 opens in the lower inner surface of the sliding hole 20, the intermediate portion of the input port 21 is not blocked by the spool 16 in the sliding hole 20 and is stored. The hole 24 communicates with a hydraulic pressure source in the engine body 11 through the communication hole 26 and the input port 21 irrespective of the position of the spool 16 in the sliding hole 20.
[0018]
  The output port 22 is disposed at a position spaced above the input port 21 along the axis of the sliding hole 20, and the sliding port 20 is within a plane perpendicular to the axis of the sliding hole 20. The outer end of the output port 22 is opened on the side surface of the valve body 14 on the engine body 11 side so as to be connected to the valve gear of the engine E. .
[0019]
  The release port 23 is arranged at a position spaced above the output port 22 along the axis of the slide hole 20, and the slide hole 20 is within a plane perpendicular to the axis of the slide hole 20. The opening end 23 is provided on the valve body 14 so as to open an inner end portion on the upper inner surface of the engine, and the outer end of the release port 23 is a side surface of the valve body 14 on the engine body 11 side so as to return the working fluid to the engine body 11 side. Is opened.
[0020]
  A spring chamber 28 is formed between the other end of the spool 16 slidably fitted into the slide hole 20 with one end facing the pilot chamber 15 and the other end closed portion of the slide hole 20. The first return spring 17 is accommodated in the spring chamber 28 so as to be provided between the other end of the spool 16 and the closed end of the sliding hole 20.
[0021]
  On the outer peripheral surface of the spool 16, there are a first annular recess 30 for selectively switching the output port 22 between the input port 21 and the release port 23 and communicating therewith, and a second annular recess 31 that always communicates with the release port 23. Provided. In addition, the spool 16 is provided with a release path 32 that communicates with the spring chamber 28 in a coaxial manner, and a communication hole 33 that allows the release path 32 to communicate with the second annular recess 31. The communication port 33 communicates with the release port 23 via the communication hole 33 and the second annular recess 31.
[0022]
  When the hydraulic pressure in the pilot chamber 15 is low, the spool 16 is at the upper limit position where the volume of the pilot chamber 15 is reduced by the spring force of the first return spring 17, as shown in FIG. 16 disconnects the output port 22 and the input port 21 and communicates the output port 22 with the release port 23 via the first annular recess 30.
[0023]
  When the hydraulic pressure in the pilot chamber 15 increases, the spool 16 moves down to the lower limit position where the volume of the pilot chamber 15 is increased against the spring force of the first return spring 17, and in this state, the spool 16 The output port 22 is communicated with the input port 21 through the first annular recess 30 and the output hydraulic pressure from the output port 22 communicating with the input port 21 becomes high.
[0024]
  When the hydraulic pressure in the pilot chamber 15 is released, the spool 16 returns to the upper limit position shown in FIG. 1 by the spring force of the first return spring 17.
[0025]
  In FIG. 3, the seal plug 18 is press-fitted into the slide hole 20 and a seal portion 18 a on which an O-ring 35 as an annular seal member that elastically contacts the inner peripheral surface of the slide hole 20 is mounted. A press-fit portion 18b that is formed to have a larger diameter than the seal portion 18a and is coaxially and integrally connected to the seal portion 18a, and a seal portion of the press-fit portion 18b that is formed to have a smaller diameter than the press-fit portion 18b. A small-diameter portion 18c coaxially and integrally provided on the opposite side to 18a is provided. The seal portion 18a is disposed on the inner side in the axial direction and is press-fitted into one end portion of the sliding hole 20.
[0026]
  On the other hand, one end of the sliding hole 20 is provided with an enlarged diameter portion 20a that is bent so as to increase in diameter toward the outside in the axial direction, and the seal plug 18 has an outer end of the press-fit portion 18b that expands. It is press-fitted into one end portion of the sliding hole 20 until it is located inward of the inner end of the diameter portion 20a, and the outer end of the small diameter portion 18c is disposed slightly inward from the one surface 14a of the valve body 14.
[0027]
  Referring also to FIG. 4, the electromagnetic three-way valve 13 has a state in which hydraulic pressure is applied from the input port 21 to the valve chamber 39 formed in the valve housing 38 through the pilot chamber 15 of the spool valve 12, and A valve portion 36 that houses a valve body 40 that operates to selectively switch the state of releasing the hydraulic pressure in the valve chamber 39; and a solenoid portion 37 that exhibits an electromagnetic force that drives the valve body 40; Consists of.
[0028]
  The valve housing 38 of the valve portion 36 is fitted and fixed to the storage hole 24 of the valve body 14, and the storage hole 24 is formed so as to gradually become smaller in diameter toward the closed end side. Accordingly, the valve housing 38 is formed in a stepped cylindrical shape.
[0029]
  The storage hole 24 is formed with a first hole 24a that closes one end and the communication hole 26 opens on the inner surface of the intermediate portion, and has a diameter larger than that of the first hole 24a, and one end at the other end of the first hole 24a. A second hole portion 24b that is coaxially connected, a third hole portion 24c that is formed to have a larger diameter than the second hole portion 24b and that has one end coaxially connected to the other end of the second hole portion 24b, and a third hole portion. The fourth hole 24d is formed with a diameter larger than 24c and one end of which is coaxially connected to the other end of the third hole 24c, and a taper in which the small diameter end is coaxially connected to the other end of the fourth hole 24d. The large-diameter end of the fifth hole 24 e opens on the upper surface of the valve body 14.
[0030]
  On the other hand, the valve housing 38 includes a stepped cylindrical housing main body 41 made of a magnetic metal and a cylindrical valve seat member 42 fixed to the housing main body 41. The housing main body 41 includes a first cylindrical portion 41 a that can be fitted into the second hole portion 24 b of the storage hole 24, a second cylindrical portion 41 b that can be fitted into the third hole portion 24 c of the storage hole 24, and the storage hole 24. And a third cylindrical portion 41c that can be fitted into the fourth hole portion 24d.
[0031]
  In addition, a first annular groove 43 is provided on the outer periphery of the housing main body 41 between the first and second cylindrical portions 41a and 41b, and a second annular groove 43 is provided on the outer periphery of the housing main body 41 between the second and third cylindrical portions 41b and 41c. An annular groove 44 is provided.
[0032]
  When the valve housing 38, that is, the housing main body 41 is fitted into the storage hole 24, the first annular groove 43 forms a first annular chamber 45 with the inner surface of one end of the third hole 24c in the storage hole 24, The second annular groove 44 forms a second annular chamber 46 with the inner surface of one end of the fourth hole 24 d in the storage hole 24.
[0033]
  In addition, the outer periphery of the first, second and third cylindrical portions 41a, 41b and 41c of the housing main body 41 is an annular seal member for sealing the first and second annular chambers 45 and 46 from both sides. Rings 47, 48, and 49 are attached. The O-ring 47 is attached to the outer periphery of the first cylindrical portion 41a so as to elastically contact the inner periphery of the second hole 24b. It is mounted on the outer periphery of the second cylindrical portion 41b so as to elastically contact the inner periphery of the third hole portion 24c, and the O-ring 49 is configured to elastically contact the inner periphery of the fourth hole portion 24d. It is attached to the outer periphery of the third cylindrical portion 41c.
[0034]
  In addition, the O-rings 47 to 49 are arranged so that the number of O-rings 47 to 49 that are in sliding contact with the inner surface of the storage hole 24 when the valve housing 38 is inserted into the storage hole 24 increases stepwise. It is installed at a position spaced apart in the axial direction of the outer periphery.In this case, the plurality of O-rings 47 to 49 are slidably contacted with the inner surface of the storage hole 24 as the diameter becomes smaller.
[0035]
  That is, when the length from the upper end of the fourth hole 24d to the axial center of the O-ring 49 is L in a state where the insertion of the housing main body 41 into the storage hole 24 is completed as shown in FIG. The length from the upper end of the third hole 24c to the axial center of the O-ring 48 is 2L, and the length from the upper end of the second hole 24b to the axial center of the O-ring 47 is 3L. Mounting positions of the rings 47 to 49 to the housing main body 41 are determined. In this way, when the housing main body 41 is inserted into the storage hole 24, the O-ring 47 first comes into sliding contact with the inner surface of the second hole 24b, and then the O-ring 47 comes into sliding contact with the inner surface of the second hole 24b. The O-ring 48 is in sliding contact with the inner surface of the third hole 24c, and then the sliding contact with the inner surface of the second hole 24b of the O-ring 47, the sliding contact with the inner surface of the third hole 24c of the O-ring 48, In addition, sliding contact with the inner surface of the fourth hole 24d of the O-ring 49 occurs at the same time.
[0036]
  A valve seat 50 is integrally provided on the inner periphery of the portion of the housing main body 41 corresponding to the axially intermediate portion of the second cylindrical portion 41b so as to protrude radially inward. The valve seat member 42 is fitted to the lower portion of the housing main body 41 so as to form a valve chamber 39 between the valve seat portion 50 and the lower end of the housing main body 41 is caulked and coupled to the lower portion of the valve seat member 42. Is done. Moreover, the valve chamber 39 communicates with the first annular chamber 45 through a plurality of passage holes 51 provided in the housing main body 41, and the first annular chamber 45 is connected to the pilot body 15 of the spool valve 12 in the valve body 14. A communication path 52 is provided to communicate with the.
[0037]
  By the way, by fitting the valve housing 38 into the storage hole 24, an input chamber 54 communicating with the input port 21 through the communication hole 26 is formed between the closed end of the storage hole 24 and the valve housing 38. The member 42 is fixed to the lower portion of the housing main body 41 by forming a valve hole 55 communicating with the input chamber 54.
[0038]
  On the other hand, a cylindrical bearing member 56 is press-fitted into the housing main body 41 above the valve seat portion 50, and a release chamber 57 is formed between the bearing member 56 and the valve seat portion 50. Moreover, the release chamber 57 communicates with the second annular chamber 46 through a plurality of passage holes 58 provided in the housing main body 41, and a hydraulic pressure release passage for allowing the second annular chamber 46 to pass through the release port 23 of the spool valve 12. 59 is provided in the valve body 14. Further, a valve hole 60 communicating with the release chamber 57 is provided in the central portion of the valve seat portion 50.
[0039]
  The valve body 40 is formed in a spherical shape, and is seated on a valve seat 61 formed in the valve seat member 42 so as to face the valve chamber 39 with the valve hole 55 opened in the center as shown in FIG. It is accommodated in the valve chamber 39 so as to selectively switch between the state and the state in which the valve hole 60 is opened at the center and faces the valve chamber 39 to be seated on the valve seat 62 formed in the valve seat portion 50. Is done. Thus, when the valve body 40 is seated on the valve seat 61, the valve chamber 39 communicates with the release chamber 57 via the valve hole 60. In this state, the hydraulic pressure in the pilot chamber 15 in the spool valve 12 is released. . When the valve body 40 is seated on the valve seat 62, the valve chamber 39 communicates with the input chamber 54 through the valve hole 55. In this state, the hydraulic pressure of the input port 21 acts on the pilot chamber 15 of the spool valve 12. To do.
[0040]
  The solenoid portion 37 includes a bottomed cylindrical solenoid housing 64 whose open end is caulked and coupled to a flange portion 41 d provided integrally with the upper portion of the housing main body 41 in the valve portion 36, and a central portion of the closed end of the solenoid housing 64. A bottomed cylindrical fixed core 65 coaxially and integrally connected, a bobbin 66 sandwiched between the closed end of the solenoid housing 64 and the flange portion 41d and surrounding the fixed core 65, and wound around the bobbin 66 A coil 67 that is inserted into the upper portion of the bobbin 66 and the housing main body 41 to oppose the fixed core 65, and a spring force that urges the movable core 68 away from the fixed core 65. And a second return spring 69 provided between the fixed core 65 and the movable core 68.
[0041]
  The bobbin 66 and the coil 67 wound around the bobbin 66 are covered with a mold part 70 made of synthetic resin. The mold part 70 is integrally formed with a coupler 70 a that protrudes outward from a notch part 64 a provided on the opening end side surface of the solenoid housing 64. The coupler 70 a is connected to a coil 67. Terminals 71 are provided.
[0042]
  The solenoid housing 64 is attached to the valve body 14 with a pair of mounting stays 72, 73. The mounting stays 72, 73 are supported by support plate portions 72a, 73a fixed to the outer surface of the solenoid housing 64, and the valve body 14. Fastening plate portions 72b and 73b fastened by bolts 74 and 75 to one surface 14a are integrally formed to have a vertical cross-sectional L shape, and the fastening plate of one of the mounting stays 72 and 73 is one of the mounting stays 73. The portion 73b is formed so as to cover at least a part (a part in this embodiment) of the seal plug 18 press-fitted into the sliding hole 20 of the valve body 14, and the outer end of the small diameter portion 18c of the seal plug 18 A slight gap is formed between the fastening plate portion 73b fastened to the one surface 14a.
[0043]
  An O-ring 76 is interposed between the inner periphery of the flange 41d side end of the bobbin 66 and the upper part of the housing main body 41, and an O-ring that coaxially surrounds the fixed core 65 between the closed ends of the bobbin 66 and the solenoid housing 64. 77 is installed.
[0044]
  A drive shaft 78 that passes coaxially through the movable core 68 is caulked and coupled to the movable core 68, and the drive shaft 78 slidably penetrates the bearing member 56. In addition, the drive shaft 78 is provided with a small-diameter shaft portion 78 a that loosely penetrates the valve hole 60 of the valve seat portion 50, and the tip of the small-diameter shaft portion 78 a is integrally provided with the valve body 40 in the valve chamber 39. Abut.
[0045]
  According to such a solenoid part 37, when the coil 67 is not energized, the movable core 68 is separated from the fixed core 65 by the spring force of the second return spring 69, and the drive shaft 78 is the valve part 36. The valve body 40 is seated on the valve seat 61, and the valve chamber 39 communicating with the pilot chamber 15 is connected via the valve hole 62, the release chamber 57, the passage hole 58, the first annular chamber 45 and the hydraulic pressure release passage 59. This leads to the release port 23. Further, when the coil 67 is energized, the movable core 68 is attracted to the fixed core 65 against the spring force of the second return spring 69, and the valve body 40 is moved by the movement of the drive shaft 78 integral with the movable core 68. Is seated on the valve seat 62, and the valve chamber 39 communicating with the pilot chamber 15 communicates with the input port 21 via the valve hole 61, the input chamber 54 and the communication hole 26.
[0046]
  Next, the operation of this embodiment will be described. The valve body 14 of the spool valve 12 has a bottomed sliding hole 20 in which one end is opened on one surface 14a of the valve body 14 and the spool 16 is slidably fitted. And a bottomed storage hole 24 that extends in parallel with the axis of the sliding hole 20 by fitting and fixing the valve housing 38 of the valve portion 36 in the electromagnetic three-way valve 13. Since the valve 13 can be disposed on the valve body 14 so that the axes thereof are parallel to each other, the valve body 14, that is, the hydraulic control device can be downsized in the direction along the axes of the spool valve 12 and the electromagnetic three-way valve 13. Can be achieved.
[0047]
  The valve body 14 is provided with a hydraulic pressure release passage 59 that leads the hydraulic pressure released from the valve chamber 39 of the valve portion 36 in the electromagnetic three-way valve 13 so as to communicate with the release port 23 of the spool valve 12. In addition, it is not necessary to provide a special release port on the electromagnetic three-way valve 13 side, and it is only necessary to connect one line even if you do not want to release or discharge hydraulic fluid outside the hydraulic pressure control device. There is no.
[0048]
  By the way, a seal plug 18 that forms a pilot chamber 15 between one end of the sliding hole 20 and the one end of the spool 16 is press-fitted and fixed in a liquid-tight manner. The part can be liquid-tightly closed with a minimum number of parts.
[0049]
  On the other hand, the bottomed storage holes 24 are formed so as to gradually become smaller in diameter toward the closed end side, and the valve housing 38 of the valve portion 36 has a stepped cylindrical shape to be fitted and fixed to the storage holes 24. A plurality of, for example, three O-rings 47 to 49 are formed so that the number of O-rings 47 to 49 slidably contacting the inner surface of the housing hole 24 when the valve housing 38 is inserted into the housing hole 24 is increased stepwise. The valve housing 38 is mounted at a position spaced apart in the axial direction on the outer periphery. Therefore, when the valve housing 38 is inserted into the storage hole 24, the pushing load due to sliding contact with the inner surface of the storage hole 24 increases stepwise, and the ease of assembly of the valve housing 38 to the valve body 14 is improved. can do. Moreover, when the O-rings 47 to 49 are abnormally attached to the valve housing 38, or when the valve housing 38 is obliquely assembled, an improper load can be easily determined due to an abnormal pushing load. Can be incorporated into the storage hole 24.
[0050]
  Moreover, in the spool valve 12, a pilot chamber 15 that faces one end of the spool 16 is formed between a seal plug 18 that is liquid-tightly pressed into one end of a sliding hole 20 provided in the valve body 14 and one end of the spool 16. Although formed in the middle, the hydraulic pressure in the pilot chamber 15 acts on the seal plug 18 in a direction that causes the seal plug 18 to escape from the sliding hole 20. For this reason, if the press-fitted and fixed state of the seal plug 18 into the sliding hole 20 is insufficient, there is a possibility that the seal plug 18 moves to the side where the seal plug 18 comes out of the sliding hole 20. However, at least a part of the seal plug 18 is covered with a fastening plate portion 73b of an attachment stay 73 for attaching the solenoid housing 64 of the electromagnetic three-way valve 13 to the one surface 14a of the valve body 14. Therefore, even if the seal plug 18 tries to move in the direction of coming out of the sliding hole 20, the movement is blocked by the fastening plate portion 73 b of the mounting stay 73, and the seal plug 18 comes out of the sliding hole 20. There is no.
[0051]
  Further, the seal plug 18 is liquid-tightly press-fitted into one end portion of the sliding hole 20 to a position spaced from the fastening plate portion 73b of the mounting stay 73 in contact with the one surface 14a of the valve body 14, so that the valve body The attachment stay 73 securely fastened to the one surface 14a of the 14 can reliably prevent the seal plug 18 from being detached from the sliding hole 20.
[0052]
  In addition, the seal plug 18 includes a seal portion 18 a on which an O-ring 35 that elastically contacts the inner peripheral surface of the slide hole 20 is mounted on the outer periphery, and the seal portion 18 a so as to be press-fitted into the slide hole 20. A press-fit portion 18b that is formed in a large diameter and coaxially and integrally connected to the seal portion 18a, and is formed in a smaller diameter than the press-fit portion 18b and is coaxial on the opposite side of the press-fit portion 18b from the seal portion 18a. The seal plug 18 is press-fitted into one end portion of the sliding hole 20 with the seal portion 18a disposed on the inner side in the axial direction. Therefore, when the seal plug 18 is press-fitted into the slide hole 20, the portion of the inner surface of the slide hole 20 that contacts the O-ring 35 is not roughened, and the O-ring 35 can be surely sealed. The press-fitting work can be facilitated by making the press-fitting length 18 relatively short.
[0053]
  Furthermore, since one end of the sliding hole 20 is provided with an enlarged diameter portion 20a that increases in diameter toward the outer side in the axial direction, the enlarged diameter portion 20a is guided when the seal plug 18 is press-fitted into the sliding hole 20. Thus, the press-fitting of the seal plug 18 into the sliding hole 20 can be facilitated and the O-ring 35 can be prevented from being damaged. Further, the seal plug 18 is press-fitted into one end portion of the sliding hole 20 until the outer end of the press-fit portion 18b is positioned inward of the inner end of the enlarged-diameter portion 20a. When the edge 18 is about to move in the removal direction, the peripheral edge of the outer end of the press-fit portion 18b is likely to bite into the inner surface of the slide hole 20, and the seal plug 18 is more reliably prevented from coming out of the slide hole 20. be able to.
[0054]
  Thus, when the seal plug 18 is press-fitted into one end portion of the sliding hole 20, the small-diameter portion 18c provided in the seal seal plug 18 is in a position corresponding to the enlarged-diameter portion 20a, and the peripheral edge portion of the outer end of the press-fit portion 18b. In this way, the outer end of the seal plug 18 can be brought close to and opposed to the fastening plate portion 73 b of the mounting stay 73.
[0055]
  The embodiments of the present invention have been described above. However, 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.
[0056]
  For example, in the above embodiment, the spool valve 12 is configured to selectively switch the communication between the output port 22 and the input port 21 and the release port 23, but the pair of output ports, the input port, and the release port It is also possible to configure the spool valve so that when one output port communicates with the input port, the other output port communicates with the release port.
[0057]
【The invention's effect】
  As aboveBookAccording to the invention, it is possible to reduce the size of the valve body, that is, the hydraulic pressure control device in the direction along the axis of the spool valve and the electromagnetic three-way valve, and it becomes unnecessary to provide a special release port on the electromagnetic three-way valve side. Even when it is not desired to open or discharge the hydraulic fluid outside the hydraulic pressure control device, only one pipe connection is required, and the cost is not increased.Also storage hole and valve housing Since the number of seal members that are in sliding contact with the inner surface of the storage hole when the valve housing is inserted into the storage hole of the valve housing increases stepwise, the pushing load due to the sliding contact with the inner surface of the storage hole Will increase stepwise, and the assembly of the valve housing to the valve body can be improved. In addition, when the seal member is abnormally attached to the valve housing, or when the valve housing is installed at an angle, it is possible to easily determine the assembly failure due to an abnormal pushing load, and the valve housing can be accurately incorporated into the storage hole. Can do.
[0058]
  In particular, according to the invention of claim 2, the one end opening of the sliding hole can be liquid-tightly closed with a minimum number of parts.
[0059]
  AlsoIn particularClaim3According to this invention, the separation of the seal plug from the sliding hole can be reliably prevented.
[0060]
  Also especiallyClaim4According to this invention, the detachment of the plug from the sliding hole can be reliably prevented by the mounting stay securely fastened to one surface of the valve body.
[0061]
  Also especiallyClaim5According to the invention, when the seal plug is press-fitted into the sliding hole, the portion of the inner surface of the sliding hole that comes into contact with the sealing member is prevented from becoming rough, and the sealing member enables a reliable sealing. The press-fitting work can be facilitated by relatively shortening the press-fitting length.
[0062]
  Claim6According to this invention, it is possible to easily press-fit the seal plug into the slide hole, to prevent the seal member from being damaged, and to more reliably prevent the seal plug from coming out of the slide hole. CanThe
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a hydraulic pressure control apparatus in a state where an electromagnetic three-way valve is closed, and is a sectional view taken along line 1-1 of FIG.
FIG. 2 is a plan view taken along arrow 2 in FIG.
FIG. 3 is an enlarged view of a main part of FIG. 1;
FIG. 4 is an enlarged longitudinal sectional view of a valve portion in an electromagnetic three-way valve.
[Explanation of symbols]
12 ... Spool valve
13 ... Electromagnetic three-way valve
14 ... Valve body
14a: One side of the valve body
15 ... Pilot room
16 ... Spool
18 ... Seal plug
18a ... seal part
18b ・・・ Press-fit part
20 ... Sliding hole
20a ... Diameter expansion part
21 ... Input port
22 ... Output port
23 ... Release port
24 ... Storage hole
35, 47-49 ... O-ring as a sealing member
36 ... Valve
37 ... Solenoid part
38 ... Valve housing
39 ... Valve
40 ... Valve
59 ... Hydraulic pressure release path
73 ... Mounting stay

Claims

A spool (16) spring-biased in a direction that causes one end to face the pilot chamber (15) and reduce the volume of the pilot chamber (15), the output port (22) as an input port (21) and a release port. A spool valve (16) which is slidably fitted to the valve body (14) so as to be able to selectively communicate with (23);
A state in which hydraulic pressure is applied from the input port (21) to the valve chamber (39) formed in the valve housing (38) through the pilot chamber (15) and the hydraulic pressure in the valve chamber (39) are released. A valve part (36) in which a valve body (40) that operates so as to selectively switch the state to be operated is housed, and a solenoid part (37) that exerts an electromagnetic force that drives the valve body (40). A hydraulic control device comprising an electromagnetic three-way valve (13) configured;
The valve body (14) of said spool valve (12) has a front Symbol spool (16) to slidably allowed to fit sliding Doana (20), extending parallel to the axis of the sliding hole (20) In addition, a bottomed storage hole (24) that gradually decreases in diameter toward the closed end side and the release port (23) so as to guide the hydraulic pressure released from the valve chamber (39) of the valve portion (36). A hydraulic pressure release path (59) leading to the valve portion (36), and the valve housing (38) of the valve portion (36) is formed in a stepped cylindrical shape to be fitted and fixed in the storage hole (24). The number of seal members (47 to 49) slidingly contacting the inner surface of the storage hole (24) when the valve housing (38) is inserted into the storage hole (24) is increased stepwise. Member (47-49) is axial direction of outer periphery of valve housing (38) Is mounted at a position spaced, the plurality of annular sealing member (47 to 49) is fluid pressure control device, characterized in that the sliding forward to accommodating hole (24) inner surface as that of the small diameter at the insertion.

The sliding hole (20) is a bottomed hole having one end opened on one surface (14a) of the valve body (14), and at one end of the sliding hole (20), the spool (16) 2. The hydraulic pressure control device according to claim 1, wherein a seal plug (18) forming a pilot chamber (15) between the one end is press-fitted and fixed in a liquid-tight manner.

The storage hole (24) is provided in the valve body (14) so as to open on the same side as the opening direction of the sliding hole (20), and is a valve fitted and fixed to the storage hole (24). The solenoid part (37) constituting the electromagnetic three-way valve (13) in cooperation with the part (36) covers at least a part of the seal plug (18) and covers one surface (14a) of the valve body (14). characterized in that the mounting stay (73) is fixed to be fastened to, fluid pressure control device according to claim 1 or 2, wherein.

The seal plug (18) is liquid-tightly press-fitted into one end of the sliding hole (20) up to a position spaced from the mounting stay (73) in contact with the one surface (14a). The hydraulic pressure control device according to claim 3 , wherein the hydraulic pressure control device is characterized.

The seal plug (18) includes a seal portion (18a) on which an annular seal member (35) elastically contacting the entire inner periphery of the sliding hole (20) is mounted on the outer periphery, and the seal portion (18a). And a press-fitting part (18b) formed coaxially and integrally on the opposite side to the pilot chamber (15) and having a larger diameter than the seal part (18a), and the press-fitting part (18b) slides. 5. The hydraulic pressure control device according to claim 4 , wherein the hydraulic pressure control device is press-fitted into the hole (20).

One end of the sliding hole (20) is provided with an enlarged diameter portion (20a) that increases in diameter toward the outside in the axial direction, and the outer end of the press-fit portion (18b) is the enlarged diameter portion (20a). The hydraulic control device according to claim 5 , wherein the seal plug (18) is press-fitted into one end of the sliding hole (20) until it is located inward of the inner end of the slide hole.