【０００１】
【発明の属する技術分野】
本発明は、一端が閉じられた嵌合孔を有する支持体に、嵌合孔の内面にその軸方向一端側から順に間隔をあけた位置で開口する出力通路、解放通路および入力通路が設けられ、出力通路に通じる出力室を嵌合孔の一端閉塞部との間に形成するとともに解放通路に通じる解放室ならびに入力通路に通じる入力室を嵌合孔の内側面との間にそれぞれ形成して嵌合孔に嵌合される弁ハウジングに、出力室に通じる制御圧室と、制御圧室に一端を臨ませた反力ピンを摺動自在に嵌合させる小径摺動孔と、反力ピンの他端を臨ませた液室と、前記液室内で反力ピンの他端に一端を同軸に当接させるスプール弁体を摺動自在に嵌合させる大径摺動孔とが同軸に設けられるとともに、入力室に外端を連通させるとともに内端を大径摺動孔に開口させた入力孔と、解放室に外端を連通させるとともに内端を大径摺動孔に開口させた第１解放孔と、大径摺動孔の軸線と交差する軸線を有するとともに入力孔に関して第１解放孔とは反対側で内端を大径摺動孔に開口させた第２解放孔と、大径摺動孔の軸線と交差する軸線を有するとともに前記入力孔および第２解放孔間で内端を大径摺動孔に開口させた出力孔と、大径摺動孔に沿う軸線を有して第１解放孔の中間部に一端部が連通されるとともに第２解放孔と交わる解放連通孔と、大径摺動孔に沿う軸線を有して一端部が出力室および制御圧室に連通されるとともに他端部が出力孔の中間部に連通される出力連通孔とが設けられる液圧制御弁に関する。
【０００２】
【従来の技術】
従来、かかる液圧制御弁は、たとえば図３で示すように構成されており、内端を大径摺動孔１８に開口させる出力孔２８′は、大径摺動孔１８の軸線と交差する方向に穿孔加工されるものであるが、従来のものでは、第２解放孔２７′および出力孔２８′の外端部を開放した状態のまま弁ハウジング３′が支持体４の嵌合孔５に嵌合、固定されている。
【０００３】
【発明が解決しようとする課題】
ところが上記従来の構造では、出力室１２および解放室１３間をシールする環状のシール部材４１と、解放室１３および入力室１４間をシールする環状のシール部材４２と、入力室１４および出力孔２８′の外端開口部間をシールする環状のシール部材４３と、出力孔２８′の外端開口部および第２解放孔２７′の外端開口部間をシールする環状のシール部材４４とを、弁ハウジング３′および支持体４間に介装する必要があり、環状のシール部材の個数が比較的多くなる。またシール個所が多いことに起因して液圧制御弁の軸方向長さが大となることを回避するためには、図３で示すように、出力孔２８′および第２解放孔２７′の軸線を、弁ハウジング３′の軸線に直交する方向から傾いた方向に設定せざるを得ず、穿孔加工が煩雑となる。
【０００４】
本発明は、かかる事情に鑑みてなされたものであり、環状のシール部材の個数を最小限とするとともに軸方向長さの短縮を図った液圧制御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、一端が閉じられた嵌合孔を有する支持体に、嵌合孔の内面にその軸方向一端側から順に間隔をあけた位置で開口する出力通路、解放通路および入力通路が設けられ、出力通路に通じる出力室を嵌合孔の一端閉塞部との間に形成するとともに解放通路に通じる解放室ならびに入力通路に通じる入力室を嵌合孔の内側面との間にそれぞれ形成して嵌合孔に嵌合される弁ハウジングに、出力室に通じる制御圧室と、制御圧室に一端を臨ませた反力ピンを摺動自在に嵌合させる小径摺動孔と、反力ピンの他端を臨ませた液室と、前記液室内で反力ピンの他端に一端を同軸に当接させるスプール弁体を摺動自在に嵌合させる大径摺動孔とが同軸に設けられるとともに、入力室に外端を連通させるとともに内端を大径摺動孔に開口させた入力孔と、解放室に外端を連通させるとともに内端を大径摺動孔に開口させた第１解放孔と、大径摺動孔の軸線と交差する軸線を有するとともに入力孔に関して第１解放孔とは反対側で内端を大径摺動孔に開口させた第２解放孔と、大径摺動孔の軸線と交差する軸線を有するとともに前記入力孔および第２解放孔間で内端を大径摺動孔に開口させた出力孔と、大径摺動孔に沿う軸線を有して第１解放孔の中間部に一端部が連通されるとともに第２解放孔と交わる解放連通孔と、大径摺動孔に沿う軸線を有して一端部が出力室および制御圧室に連通されるとともに他端部が出力孔の中間部に連通される出力連通孔とが設けられる液圧制御弁において、出力室および解放室間で弁ハウジングおよび支持体間に環状の第１シール部材が設けられ、解放室および入力室間で弁ハウジングおよび支持体間に環状の第２シール部材が設けられ、出力孔および第２解放孔の外端間で弁ハウジングおよび支持体間に環状の第３シール部材が設けられ、出力連通孔との連通部よりも外方位置で出力孔が栓部材で液密に閉塞されることを特徴とする。
【０００６】
また請求項２記載の発明によれば、上記請求項１記載の発明の構成に加えて、弁ハウジングの一端部には、その一端側に臨む段部を介して小径部が同軸に設けられ、第１シール部材を装着するシール装着溝を前記段部との間に形成するとともに反力ピンの弁ハウジングからの離脱を阻止するキャップ状のフィルタが前記小径部に装着される。
【０００７】
【発明の実施の形態】
以下、本発明の実施の形態を、添付図面に示した本発明の一実施例に基づいて説明する。
【０００８】
先ず図１において、この液圧制御装置は、液圧制御弁１にリニアソレノイド２が組付けられて成るものであり、たとえば車両用ブレーキ装置のブレーキ液圧制御に用いられる。
【０００９】
液圧制御弁１の弁ハウジング３は、支持体４に設けられた嵌合孔５に該嵌合孔５からの離脱を阻止するようにして嵌合される。而して嵌合孔５は、その一端側を閉じた有底状にして一端側に向かうにつれて段階的に小径となる段付きに形成されるものであり、該嵌合孔５の他端部を閉じるようにしてリニアソレノイド２が支持体４に装着される。すなわち嵌合孔５の他端開口部にリニアソレノイド２が嵌合され、嵌合孔５の前記他端開口部内面にリニアソレノイド２の外面に設けられた係止溝２ａに係合する止め輪６が嵌着される。而して弁ハウジング３は、リニアソレノイド２と嵌合孔５の一端閉塞部との間で移動を規制されるようにして嵌合孔５に嵌合されることになる。
【００１０】
支持体４には、嵌合孔５の一端部内面に開口する出力通路７と、嵌合孔５の中間部内側面に開口する解放通路８と、嵌合孔５の中間部内側面に開口する入力通路９とが、嵌合孔５の一端から他端側に軸方向に間隔をあけて順に穿設されている。而して出力通路７は車輪ブレーキ等の液圧機器に接続され、解放通路８はリザーバに接続され、入力通路９は液圧源に接続される。
【００１１】
弁ハウジング３は、円筒状のガイド部材１０と、該ガイド部材１０の一端側に液密に嵌合される有底円筒状の隔壁部材１１とで構成されるものであり、隔壁部材１１は、その一端開口部で半径方向外方に張出して一体に設けられた鍔部１１ａをガイド部材１０の一端面に係合させるようにしてガイド部材１０の一端側に液密に嵌合される。この弁ハウジング３が嵌合孔５に嵌合されることにより、支持体４および弁ハウジング３間には、出力通路７に通じる出力室１２と、解放通路８に通じる環状の解放室１３と、入力通路９に通じる環状の入力室１４とが画成される。
【００１２】
一方、弁ハウジング３には、その一端側から順に、制御圧室１５と、小径摺動孔１６と、液室１７と、大径摺動孔１８とが同軸に設けられる。制御圧室１５は隔壁部材１１内に形成されるものであり、小径摺動孔１６は隔壁部材１１の閉塞端に設けられる。小径摺動孔１６には一端を制御圧室１５に臨ませた反力ピン１９が摺動自在に嵌合される。液室１７はガイド部材１０および隔壁部材１１間に画成されるものであり、前記反力ピン１９の他端は該液室１７内に突入される。さらに大径摺動孔１８は、液室１７の内径よりも小径であるが小径摺動孔１６よりも大径にしてガイド部材１０に穿設されるものであり、この大径摺動孔１８には、液室１７内で反力ピン１９の他端に一端を当接させるスプール弁体２０が摺動自在に嵌合され、該スプール弁体２０の他端には、リニアソレノイド２のプランジャ２１が同軸に当接される。しかも液室１８内で隔壁部材１１およびスプール弁体２０間には、スプール弁体２０をプランジャ２１に常時当接させるための比較的弱いばね力を発揮する戻しばね２２が設けられる。
【００１３】
大径摺動孔１８の内面には、入力室１４にほぼ対応した位置で第１環状凹部２３が設けられるとともに、第１環状凹部２３から解放室１３とは反対側に間隔をあけた位置で第２環状凹部２４が設けられる。
【００１４】
また弁ハウジング３におけるガイド部材１０には、入力室１４に外端を連通させるとともに内端を大径摺動孔１８に開口させた入力孔２５と、解放室１３に外端を連通させるとともに内端を大径摺動孔１８に開口させた第１解放孔２６と、入力孔２５に関して第１解放孔２６とは反対側で内端を大径摺動孔１８に開口させた第２解放孔２７と、前記入力孔２５および第２解放孔２７間で内端を大径摺動孔１８に開口させた出力孔２８とが、大径摺動孔１８の軸線と直交する軸線を有して設けられるとともに、第１解放孔２６の中間部に一端部が連通されるとともに第２解放孔２７と交わってガイド部材１０の他端に開口される解放連通孔２９と、一端部がガイド部材１０の一端に開口されて出力室１２および制御圧室１５に連通されるとともに他端部が出力孔２８の中間部に連通される出力連通孔３０とが、大径摺動孔１８に沿う軸線を有して設けられる。
【００１５】
図２において、出力孔２８は、大径摺動孔１８に内端を開口させる小径孔部２８ａと、ガイド部材１０の外側面に外端を開口させる大径孔部２８ｂとが段部２８ｃを介して同軸に連設されて成るものであり、出力連通孔３０は小径孔部２８ａに連通される。しかも大径孔部２８ｂには、合成樹脂により円盤状に形成される栓部材３１が段部２８ｃに当接するまで嵌入されるものであり、この栓部材３１により出力孔２８において出力連通孔３０との連通部よりも外方位置が液密に閉塞されることになる。
【００１６】
スプール弁体２０の外周には環状溝３２が設けられており、該環状溝３２は、スプール弁体２０が図１で示すように後退限に在るときには出力孔２８を第２環状凹部２４すなわち第２解放孔２７に連通せしめるが第１環状凹部２３すなわち入力孔２５とは遮断し、スプール弁体２０が後退限から前進したときには出力孔２８を第１環状凹部２３すなわち入力孔２５に連通せしめるが第２環状凹部２４すなわち第２解放孔２７とは遮断するように形成される。
【００１７】
ところで、弁ハウジング３におけるガイド部材１０の一端部には、その一端側に臨む段部１０ａを介して小径部１０ｂが同軸に設けられており、小径部１０ｂの先端には環状の係止突部１０ｃが設けられる。而してその小径部１０ｂには、係止突部１０ｃに弾発係合して弁ハウジング３の一端部を覆うキャップ状のフィルタ３３が装着され、ガイド部材１０からの隔壁部材１１の離脱、ならびに隔壁部材１１からの反力ピン１９の離脱が該フィルタ３３によって阻止される。
【００１８】
しかもフィルタ３３は、前記段部１０ａとの間にシール装着溝３４を形成するものであり、出力室１２および解放室１３間をシールする環状の第１シール部材３５がシール装着溝３４に装着される。また解放室１３および入力室１４間をシールする環状の第２シール部材３６が弁ハウジング３におけるガイド部材１０の外周に装着され、出力孔２８および第２解放孔２７の外端間をシールする環状の第３シール部材３７が弁ハウジング３におけるガイド部材１０の外周に装着される。
【００１９】
次にこの実施例の作用について説明すると、リニアソレノイド２は入力電気量に応じた軸方向推力をプランジャ２１に与えるものであり、該プランジャ２１がスプール弁体２０に同軸に当接されていることにより、スプール弁体２０は、リニアソレノイド２からの前記軸方向推力で出力孔２８を入力孔２５に連通する方向に押圧されることになる。一方、スプール弁体２０には、戻しばね２２により前記軸方向推力に対抗するばね力が与えられるとともに、制御圧室１５すなわち出力孔２８の液圧が反力ピン１９に作用することにより反力ピン１９からの反力が前記軸方向推力に対抗して与えられることになる。このようにして、スプール弁体２０は、リニアソレノイド２の推力と、戻しばね２２のばね力ならびに反力ピン１９からの反力とが均衡するように、出力孔２８を第２解放孔２７に連通させる位置と出力孔２８を入力孔２５に連通させる位置との間で大径摺動孔１８内を移動し、これにより出力孔２８すなわち出力通路７からはリニアソレノイド２への入力電気量に応じた液圧が出力されることになる。
【００２０】
このような液圧制御弁１において、大径摺動孔１８の軸線に交差する軸線を有して弁ハウジング３におけるガイド部材１０に穿設される出力孔２８の外端が栓部材３１で閉塞されるので、入力室１４と出力孔２８の外端部との間を環状のシール部材でシールする必要はなく、したがって第１シール部材３５により出力室１２および解放室１３間をシールし、第２シール部材３６により解放室１３および入力室１４間をシールし、第３シール部材３７により出力孔２８および第２解放孔２７の外端間をシールすればよいので、環状のシール部材が４個必要であった図３の従来技術に比べると、環状のシール部材の個数を減少させることができ、それに伴ってガイト部材１０すなわち弁ハウジング３の軸方向長さを短縮し、液圧制御弁１の小型化に寄与することが可能となる。
【００２１】
しかも入力室１７の液圧が出力孔２８の外端部の栓部材３１を軸方向内方側に押圧することになるので、栓部材３１をその全周にわたって段部２８ｃに密接させることができ、栓部材３１を大径孔部２８ａに遊嵌しても出力孔２８の外端部を液密に閉塞可能となり、栓部材３１の組付け作業が容易となる。
【００２２】
また弁ハウジング３におけるガイド部材１０の一端部に段部１０ａを介して小径部１０ｂが同軸に設けられ、第１シール部材３５を装着するシール装着溝３４を段部１０ａとの間に形成するとともに隔壁部材１１および反力ピン１９のガイド部材１０からの離脱を阻止するフィルタ３３が小径部１０ｂに装着されるので、出力孔７側から弁ハウジング３側に塵等が侵入することを防止してスプール弁体２０の円滑な作動を保証することができるとともに、反力ピン１９の抜け止め専用の部品を省略することが可能であって部品点数の低減に寄与することができ、しかも第１シール部材３５を装着するための溝をガイド部材１０に穿設することが不要となって加工工数の低減にも寄与することができる。
【００２３】
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。
【００２４】
たとえば隔壁部材１１がガイド部材１０に固着されていてもよい。
【００２５】
【発明の効果】
以上のように請求項１記載の発明によれば、出力室および解放室間で弁ハウジングおよび支持体間に環状の第１シール部材が設けられ、解放室および入力室間で弁ハウジングおよび支持体間に環状の第２シール部材が設けられ、出力孔および第２解放孔の外端間で弁ハウジングおよび支持体間に環状の第３シール部材が設けられ、出力連通孔との連通部よりも外方位置で出力孔が栓部材で液密に閉塞されるので、入力室および出力孔の外端部間をシールすることを不要として環状のシール部材の個数を低減することができるとともに弁ハウジングの軸方向長さを短縮して小型化に寄与することが可能となる。
【００２６】
また請求項２記載の発明によれば、上記請求項１記載の発明の構成に加えて、弁ハウジングの一端部には、その一端側に臨む段部を介して小径部が同軸に設けられ、第１シール部材を装着するシール装着溝を前記段部との間に形成するとともに反力ピンの弁ハウジングからの離脱を阻止するキャップ状のフィルタが前記小径部に装着されるので、出力孔側からの塵等の侵入を防止してスプール弁体の円滑な作動を保証することができるとともに、反力ピンの抜け止め専用部品を省略して部品点数の低減に寄与するとともに第１シール部材用の溝を特に設けることを不要として加工工数の低減にも寄与することができる。
【図面の簡単な説明】
【図１】液圧制御弁の縦断面図である。
【図２】図１の要部拡大図である。
【図３】従来の液圧制御弁の縦断面図である。
【符号の説明】
１・・・液圧制御弁
３・・・弁ハウジング
４・・・支持体
５・・・嵌合孔
７・・・出力通路
８・・・解放通路
９・・・入力通路
１０ａ・・・段部
１０ｂ・・・小径部
１２・・・出力室
１３・・・解放室
１４・・・入力室
１５・・・制御圧室
１６・・・小径摺動孔
１７・・・液室
１８・・・大径摺動孔
１９・・・反力ピン
２０・・・スプール弁体
２５・・・入力孔
２６・・・第１解放孔
２７・・・第２解放孔
２８・・・出力孔
２９・・・解放連通孔
３０・・・出力連通孔
３１・・・栓部材
３３・・・フィルタ
３４・・・シール装着溝
３５・・・第１シール部材
３６・・・第２シール部材
３７・・・第３シール部材[0001]
BACKGROUND OF THE INVENTION
In the present invention, an output passage, a release passage, and an input passage are provided in a support body having a fitting hole closed at one end, and are opened on the inner surface of the fitting hole at positions spaced sequentially from one end in the axial direction. An output chamber communicating with the output passage is formed between one end of the fitting hole and a release chamber communicating with the release passage, and an input chamber communicating with the input passage is formed between the inner surface of the fitting hole. A control pressure chamber that leads to the output chamber, a small-diameter sliding hole that slidably fits a reaction force pin with one end facing the control pressure chamber, and a reaction force pin. And a large-diameter sliding hole that slidably fits a spool valve body that coaxially contacts the other end of the reaction force pin with the other end of the reaction force pin in the liquid chamber. Input hole with the outer end communicating with the input chamber and the inner end opened to the large-diameter sliding hole. A first release hole having an outer end communicating with the release chamber and an inner end opened to the large-diameter sliding hole; an axis intersecting the axis of the large-diameter sliding hole; and the first release hole with respect to the input hole; Has a second release hole whose inner end is opened to the large-diameter sliding hole on the opposite side, and an axis that intersects the axis of the large-diameter sliding hole, and has a large inner end between the input hole and the second release hole. An output hole opened in the diameter sliding hole, a release communicating hole having an axis along the large diameter sliding hole and having one end communicated with an intermediate portion of the first releasing hole and intersecting the second releasing hole; A hydraulic control valve having an axis extending along the large-diameter sliding hole and having an output communication hole having one end communicating with the output chamber and the control pressure chamber and the other end communicating with an intermediate portion of the output hole About.
[0002]
[Prior art]
Conventionally, such a hydraulic pressure control valve is configured as shown in FIG. 3, for example, and an output hole 28 ′ that opens the inner end into the large-diameter sliding hole 18 intersects the axis of the large-diameter sliding hole 18. In the prior art, the valve housing 3 ′ is fitted in the fitting hole 5 of the support 4 with the outer ends of the second release hole 27 ′ and the output hole 28 ′ open. It is fitted and fixed to.
[0003]
[Problems to be solved by the invention]
However, in the conventional structure, an annular seal member 41 that seals between the output chamber 12 and the release chamber 13, an annular seal member 42 that seals between the release chamber 13 and the input chamber 14, the input chamber 14 and the output hole 28. An annular seal member 43 that seals between the outer end openings of ′, and an annular seal member 44 that seals between the outer end opening of the output hole 28 ′ and the outer end opening of the second release hole 27 ′, It is necessary to interpose between the valve housing 3 ′ and the support 4, and the number of annular seal members is relatively large. Further, in order to avoid an increase in the axial length of the hydraulic pressure control valve due to the large number of sealing portions, as shown in FIG. 3, the output holes 28 'and the second release holes 27' The axis line must be set in a direction inclined from the direction orthogonal to the axis line of the valve housing 3 ', and the drilling process becomes complicated.
[0004]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a hydraulic control valve that minimizes the number of annular seal members and shortens the axial length.
[0005]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention described in claim 1 is provided in a support body having a fitting hole closed at one end, and is opened at a position spaced sequentially from one end side in the axial direction on the inner surface of the fitting hole. Output passage, release passage, and input passage are formed, and an output chamber that leads to the output passage is formed between the closed end of the fitting hole and a release chamber that leads to the release passage and an input chamber that leads to the input passage are fitted A valve housing that is formed between the inner surface of each hole and is fitted into the fitting hole. A control pressure chamber that leads to the output chamber and a reaction force pin that faces one end of the control pressure chamber are slidable. A small-diameter sliding hole to be fitted, a liquid chamber facing the other end of the reaction force pin, and a spool valve body having one end coaxially abutted with the other end of the reaction force pin in the liquid chamber are slidably fitted. A large-diameter sliding hole to be combined is provided coaxially, and the outer end communicates with the input chamber. An input hole having an inner end opened to the large-diameter sliding hole, a first release hole having an outer end communicating with the release chamber and an inner end opened to the large-diameter sliding hole, and a large-diameter sliding hole A second release hole having an axis intersecting the axis and having an inner end opened to the large-diameter slide hole on the opposite side of the first release hole with respect to the input hole, and an axis intersecting the axis of the large-diameter slide hole An output hole having an inner end opened to a large-diameter sliding hole between the input hole and the second release hole, and an axis extending along the large-diameter sliding hole, and having one end at an intermediate portion of the first release hole Is connected to the second release hole and has an axis along the large-diameter sliding hole, and one end portion is communicated with the output chamber and the control pressure chamber, and the other end portion is in the middle of the output hole. In a hydraulic control valve provided with an output communication hole communicated with the part, a ring is provided between the output chamber and the release chamber between the valve housing and the support body. The first seal member is provided, the annular second seal member is provided between the valve housing and the support body between the release chamber and the input chamber, and the valve housing and support body are provided between the outer ends of the output hole and the second release hole. An annular third seal member is provided therebetween, and the output hole is liquid-tightly closed with a plug member at a position outside the communication portion with the output communication hole.
[0006]
Further, according to the invention described in claim 2, in addition to the configuration of the invention described in claim 1, the one end portion of the valve housing is coaxially provided with the small diameter portion through the step portion facing the one end side, A cap-shaped filter that forms a seal mounting groove for mounting the first seal member between the step portion and prevents the reaction force pin from being detached from the valve housing is mounted on the small diameter portion.
[0007]
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.
[0008]
First, in FIG. 1, this hydraulic pressure control device is constructed by assembling a linear solenoid 2 to a hydraulic pressure control valve 1 and is used, for example, for brake hydraulic pressure control of a vehicle brake device.
[0009]
The valve housing 3 of the hydraulic control valve 1 is fitted into a fitting hole 5 provided in the support body 4 so as to prevent detachment from the fitting hole 5. Thus, the fitting hole 5 has a bottomed shape with one end closed, and is formed in a stepped shape that gradually decreases in diameter toward the one end. The other end of the fitting hole 5 The linear solenoid 2 is mounted on the support 4 so as to be closed. That is, the linear solenoid 2 is fitted into the other end opening of the fitting hole 5, and the retaining ring is engaged with the engaging groove 2 a provided on the outer surface of the linear solenoid 2 on the inner surface of the other opening of the fitting hole 5. 6 is fitted. Thus, the valve housing 3 is fitted into the fitting hole 5 so as to be restricted in movement between the linear solenoid 2 and the one end closed portion of the fitting hole 5.
[0010]
The support 4 has an output passage 7 that opens to the inner surface of one end of the fitting hole 5, a release passage 8 that opens to the inner surface of the middle portion of the fitting hole 5, and an input that opens to the inner surface of the middle portion of the fitting hole 5. A passage 9 is sequentially bored from one end of the fitting hole 5 to the other end side in the axial direction. Thus, the output passage 7 is connected to a hydraulic device such as a wheel brake, the release passage 8 is connected to a reservoir, and the input passage 9 is connected to a hydraulic pressure source.
[0011]
The valve housing 3 includes a cylindrical guide member 10 and a bottomed cylindrical partition member 11 that is liquid-tightly fitted to one end of the guide member 10. The flange 11a that is integrally provided by projecting outward in the radial direction at the one end opening is engaged with one end of the guide member 10 in a liquid-tight manner. By fitting the valve housing 3 into the fitting hole 5, an output chamber 12 that communicates with the output passage 7, an annular release chamber 13 that communicates with the release passage 8, and the support 4 and the valve housing 3, An annular input chamber 14 communicating with the input passage 9 is defined.
[0012]
On the other hand, in the valve housing 3, a control pressure chamber 15, a small diameter sliding hole 16, a liquid chamber 17, and a large diameter sliding hole 18 are provided coaxially in this order from one end side. The control pressure chamber 15 is formed in the partition member 11, and the small diameter sliding hole 16 is provided at the closed end of the partition member 11. A reaction force pin 19 having one end facing the control pressure chamber 15 is slidably fitted into the small diameter sliding hole 16. The liquid chamber 17 is defined between the guide member 10 and the partition member 11, and the other end of the reaction force pin 19 is inserted into the liquid chamber 17. Further, the large diameter sliding hole 18 is formed in the guide member 10 with a diameter smaller than the inner diameter of the liquid chamber 17 but larger than the small diameter sliding hole 16. In the liquid chamber 17, a spool valve body 20 whose one end abuts against the other end of the reaction force pin 19 is slidably fitted, and the other end of the spool valve body 20 has a plunger of the linear solenoid 2. 21 is abutted coaxially. In addition, a return spring 22 is provided between the partition wall member 11 and the spool valve body 20 in the liquid chamber 18 so as to exhibit a relatively weak spring force for always bringing the spool valve body 20 into contact with the plunger 21.
[0013]
A first annular recess 23 is provided on the inner surface of the large-diameter sliding hole 18 at a position substantially corresponding to the input chamber 14, and at a position spaced from the first annular recess 23 on the side opposite to the release chamber 13. A second annular recess 24 is provided.
[0014]
The guide member 10 in the valve housing 3 communicates with the input chamber 14 at the outer end and the input hole 25 having the inner end opened at the large-diameter sliding hole 18 and the release chamber 13 at the outer end. A first release hole 26 whose end is opened to the large-diameter sliding hole 18 and a second release hole whose inner end is opened to the large-diameter sliding hole 18 on the side opposite to the first release hole 26 with respect to the input hole 25. 27 and an output hole 28 having an inner end opened to the large-diameter sliding hole 18 between the input hole 25 and the second release hole 27 has an axis perpendicular to the axis of the large-diameter sliding hole 18. A release communication hole 29 provided at one end of the first release hole 26 and communicated with the second release hole 27 and opened at the other end of the guide member 10, and one end of the guide member 10. Is connected to the output chamber 12 and the control pressure chamber 15. An output communication hole 30 which the other end is communicated with an intermediate portion of the output hole 28 is provided having an axis along the major diameter slide Doana 18.
[0015]
In FIG. 2, the output hole 28 includes a small-diameter hole portion 28 a that opens the inner end in the large-diameter sliding hole 18, and a large-diameter hole portion 28 b that opens the outer end in the outer surface of the guide member 10. The output communication hole 30 communicates with the small-diameter hole portion 28a. In addition, a plug member 31 formed in a disk shape with a synthetic resin is inserted into the large-diameter hole portion 28b until it abuts on the step portion 28c. The plug member 31 and the output communication hole 30 are connected to the output hole 28 by the plug member 31. Therefore, the outer position is more liquid-tightly closed than the communicating portion.
[0016]
An annular groove 32 is provided on the outer periphery of the spool valve body 20, and the annular groove 32 allows the output hole 28 to be connected to the second annular recess 24, that is, when the spool valve body 20 is in the retreat limit as shown in FIG. The second release hole 27 communicates with the first annular recess 23, that is, the input hole 25, and the output hole 28 communicates with the first annular recess 23, that is, the input hole 25 when the spool valve body 20 advances from the retreat limit. Is formed so as to be blocked from the second annular recess 24, that is, the second release hole 27.
[0017]
By the way, the small diameter part 10b is coaxially provided in the one end part of the guide member 10 in the valve housing 3 via the step part 10a which faces the one end side, and the cyclic | annular latching protrusion is formed in the front-end | tip of the small diameter part 10b. 10c is provided. Thus, the small-diameter portion 10b is fitted with a cap-shaped filter 33 that elastically engages with the locking projection 10c and covers one end of the valve housing 3, and the partition member 11 is detached from the guide member 10. The filter 33 prevents the reaction force pin 19 from being separated from the partition wall member 11.
[0018]
In addition, the filter 33 forms a seal mounting groove 34 between the step portion 10 a and an annular first seal member 35 that seals between the output chamber 12 and the release chamber 13 is mounted in the seal mounting groove 34. The An annular second seal member 36 that seals between the release chamber 13 and the input chamber 14 is mounted on the outer periphery of the guide member 10 in the valve housing 3 and seals between the outer ends of the output hole 28 and the second release hole 27. The third seal member 37 is mounted on the outer periphery of the guide member 10 in the valve housing 3.
[0019]
Next, the operation of this embodiment will be described. The linear solenoid 2 applies an axial thrust according to the input electric quantity to the plunger 21, and the plunger 21 is in contact with the spool valve body 20 coaxially. Thus, the spool valve body 20 is pressed in the direction in which the output hole 28 communicates with the input hole 25 by the axial thrust from the linear solenoid 2. On the other hand, a spring force that opposes the axial thrust is applied to the spool valve body 20 by the return spring 22, and the reaction force is exerted by the hydraulic pressure of the control pressure chamber 15, that is, the output hole 28 acting on the reaction force pin 19. The reaction force from the pin 19 is applied against the axial thrust. In this way, the spool valve body 20 has the output hole 28 in the second release hole 27 so that the thrust of the linear solenoid 2 is balanced with the spring force of the return spring 22 and the reaction force from the reaction force pin 19. It moves in the large-diameter sliding hole 18 between the position for communication and the position for connecting the output hole 28 to the input hole 25, whereby the input electric quantity from the output hole 28, that is, the output passage 7, to the linear solenoid 2. The corresponding hydraulic pressure is output.
[0020]
In such a hydraulic control valve 1, the outer end of the output hole 28 formed in the guide member 10 in the valve housing 3 having an axis intersecting the axis of the large-diameter sliding hole 18 is blocked by the plug member 31. Therefore, it is not necessary to seal between the input chamber 14 and the outer end portion of the output hole 28 with an annular seal member. Therefore, the gap between the output chamber 12 and the release chamber 13 is sealed by the first seal member 35, It is only necessary to seal between the release chamber 13 and the input chamber 14 with the two seal members 36 and seal between the outer ends of the output hole 28 and the second release hole 27 with the third seal member 37, so that four annular seal members are provided. Compared with the prior art shown in FIG. 3, the number of annular seal members can be reduced, and accordingly, the axial length of the guide member 10, that is, the valve housing 3 is shortened, and the hydraulic pressure control valve 1. Downsizing It is possible to contribute to.
[0021]
Moreover, since the hydraulic pressure in the input chamber 17 presses the plug member 31 at the outer end of the output hole 28 toward the inner side in the axial direction, the plug member 31 can be brought into close contact with the step portion 28c over the entire circumference. Even if the plug member 31 is loosely fitted into the large-diameter hole portion 28a, the outer end portion of the output hole 28 can be liquid-tightly closed, and the assembly work of the plug member 31 becomes easy.
[0022]
In addition, a small diameter portion 10b is coaxially provided at one end portion of the guide member 10 in the valve housing 3 via a step portion 10a, and a seal mounting groove 34 for mounting the first seal member 35 is formed between the step portion 10a. Since the filter 33 that prevents the separation of the partition member 11 and the reaction force pin 19 from the guide member 10 is attached to the small diameter portion 10b, dust and the like are prevented from entering the valve housing 3 from the output hole 7 side. The smooth operation of the spool valve body 20 can be ensured, the parts dedicated to retaining the reaction force pin 19 can be omitted, which can contribute to a reduction in the number of parts, and the first seal. It is not necessary to make a groove in the guide member 10 for mounting the member 35, which can contribute to a reduction in processing man-hours.
[0023]
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.
[0024]
For example, the partition member 11 may be fixed to the guide member 10.
[0025]
【The invention's effect】
As described above, according to the first aspect of the present invention, the annular first seal member is provided between the valve housing and the support body between the output chamber and the release chamber, and the valve housing and support body are provided between the release chamber and the input chamber. An annular second seal member is provided between the valve housing and the support body between the outer ends of the output hole and the second release hole, and an annular third seal member is provided between the output communication hole and the communication portion. Since the output hole is liquid-tightly closed by the plug member at the outer position, it is not necessary to seal between the input chamber and the outer end of the output hole, and the number of annular seal members can be reduced and the valve housing It is possible to reduce the length in the axial direction and contribute to downsizing.
[0026]
Further, according to the invention described in claim 2, in addition to the configuration of the invention described in claim 1, the one end portion of the valve housing is coaxially provided with the small diameter portion through the step portion facing the one end side, A cap-shaped filter that forms a seal mounting groove for mounting the first seal member between the step portion and prevents the reaction force pin from being detached from the valve housing is mounted on the small diameter portion, so that the output hole side In addition to preventing the entry of dust, etc. from the surface, it is possible to guarantee the smooth operation of the spool valve body, and to reduce the number of parts by eliminating the dedicated parts for retaining the reaction force pin and for the first seal member Therefore, it is unnecessary to provide the grooves, which can contribute to the reduction of processing man-hours.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a hydraulic control valve.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is a longitudinal sectional view of a conventional hydraulic control valve.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Fluid pressure control valve 3 ... Valve housing 4 ... Support body 5 ... Fitting hole 7 ... Output passage 8 ... Release passage 9 ... Input passage 10a ... Stage Part 10b ... Small diameter part 12 ... Output chamber 13 ... Release chamber 14 ... Input chamber 15 ... Control pressure chamber 16 ... Small diameter sliding hole 17 ... Liquid chamber 18 ... Large diameter sliding hole 19 ... reaction force pin 20 ... spool valve element 25 ... input hole 26 ... first release hole 27 ... second release hole 28 ... output hole 29 ... Open communication hole 30 ... Output communication hole 31 ... Plug member 33 ... Filter 34 ... Seal mounting groove 35 ... First seal member 36 ... Second seal member 37 ... First 3 seal members
