JP2000065228A - Lock valve - Google Patents
Lock valveInfo
- Publication number
- JP2000065228A JP2000065228A JP10253308A JP25330898A JP2000065228A JP 2000065228 A JP2000065228 A JP 2000065228A JP 10253308 A JP10253308 A JP 10253308A JP 25330898 A JP25330898 A JP 25330898A JP 2000065228 A JP2000065228 A JP 2000065228A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- small
- main
- small valve
- opening
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Safety Valves (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、油圧ショベル等の
種々の産業用機械に用いられ、液体圧力源により駆動さ
れる各種アクチュエータに給排する圧油の流量を制御す
る方向切換弁等に用いられ、ブームシリンダまたはアー
ムシリンダをロックするロック弁に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for various industrial machines such as a hydraulic excavator, and is used for a directional control valve for controlling a flow rate of pressure oil supplied to and discharged from various actuators driven by a liquid pressure source. And a lock valve for locking a boom cylinder or an arm cylinder.
【０００２】[0002]
【従来の技術】この種のロック弁の従来技術として、特
開平６−５０３０２号公報が挙げられる。この従来技術
のロック弁は、以下のように構成されている。アクチュ
エータポートとタンク通路との通路を開閉するメインポ
ペット（主弁）と、このメインポペット（主弁）に対し
て背圧を作用させて閉弁状態を維持する圧力室と、パイ
ロット圧が作用した時に前記圧力室を中継通路に連通さ
せるためのバイロットポペット（小弁）と、該バイロッ
トポペット（小弁）と前記メインポペット（主弁）の間
に縮設されたバネとを備えている。2. Description of the Related Art Japanese Unexamined Patent Publication No. 6-50302 discloses a conventional lock valve of this type. The lock valve of the related art is configured as follows. A main poppet (main valve) that opens and closes the passage between the actuator port and the tank passage, a pressure chamber that maintains a closed state by applying a back pressure to the main poppet (main valve), and a pilot pressure is applied. Sometimes a bi-rot poppet (small valve) for communicating the pressure chamber with the relay passage, and a spring contracted between the bi-rot poppet (small valve) and the main poppet (main valve).
【０００３】[0003]
【発明が解決しようとする課題】従来のロック弁は、前
記主弁、小弁及びバネはそれぞれ別体に作られており、
組み付ける際にも、主弁、小弁及びバネをそれぞれ個別
に取り付けるようになっているため、主弁と小弁の間に
縮設するバネが屈曲しやすく、その組立作業に特別の熟
練を要するという問題があった。また、主弁と小弁とが
軸方向に並んで配置されている構造であるため、軸方向
に大型化する問題があった。In the conventional lock valve, the main valve, the small valve and the spring are formed separately from each other.
When assembling, the main valve, the small valve and the spring are individually mounted, so that the spring contracted between the main valve and the small valve is easily bent, and special skill is required for the assembling work. There was a problem. Further, since the main valve and the small valve are arranged side by side in the axial direction, there is a problem that the size is increased in the axial direction.
【０００４】本発明の課題は、組立作業が簡単で熟練を
要しないロック弁を提供することにある。また、軸方向
に小型化できるロック弁を提供することにある。[0004] It is an object of the present invention to provide a lock valve which is easy to assemble and requires no skill. Another object of the present invention is to provide a lock valve that can be downsized in the axial direction.
【０００５】[0005]
【課題を解決するための手段】上記課題を達成するた
め、本願請求項１に記載の発明は、本体に形成されたア
クチュエータポートとタンク通路との油の通路を開閉す
る主弁と、この主弁を閉弁方向に押圧する背圧が導入さ
れる圧力室と、小弁開閉機構から圧力を受けた時に小弁
用弁座から離れて前記圧力室内の圧油の密閉状態を開放
する小弁と、前記主弁と小弁との間に設けられて両者を
相対的に離反する方向に付勢する付勢手段とを備えたロ
ック弁において、前記主弁、小弁および付勢手段は一体
のユニットに形成された状態で組み込まれていることを
特徴とするものである。本発明によれば、前記主弁、小
弁および付勢手段は、予め一体のユニットに形成され、
組立作業はこのユニットを組み込むことにより単一の工
程で行えるため、バネの屈曲の恐れが無いのは勿論、特
別の熟練を要さず簡単に組み立てることができる。In order to achieve the above object, an invention according to claim 1 of the present application provides a main valve for opening and closing an oil passage between an actuator port formed in a main body and a tank passage, and a main valve for opening and closing the main valve. A pressure chamber into which a back pressure for pressing the valve in the valve closing direction is introduced, and a small valve which separates from the valve seat for the small valve when receiving pressure from the small valve opening / closing mechanism and opens the sealed state of the pressure oil in the pressure chamber. And a biasing means provided between the main valve and the small valve and biasing the two in the direction of relative separation, wherein the main valve, the small valve and the biasing means are integrated. The unit is incorporated in a state formed in the unit. According to the present invention, the main valve, the small valve, and the urging means are formed in advance as an integrated unit,
Since the assembling operation can be performed in a single step by incorporating this unit, it is possible to easily assemble without any special skill, not to mention that there is no fear of spring bending.
【０００６】また、本願請求項２に記載の発明は、請求
項１に記載された発明において、前記主弁は有底筒状に
形成され、前記小弁は略全体が前記主弁の筒内に配置さ
れていることを特徴とするものである。これにより、主
弁と小弁を軸方向でラップさせることができるため、軸
方向に対して短く、即ち小型化することができる。According to a second aspect of the present invention, in the first aspect of the invention, the main valve is formed in a bottomed cylindrical shape, and the small valve is substantially entirely formed in a cylinder of the main valve. Is characterized by being arranged in a. Thus, the main valve and the small valve can be wrapped in the axial direction, so that the main valve and the small valve can be shortened in the axial direction, that is, downsized.
【０００７】また、本願請求項３に記載の発明は、請求
項１又は２に記載された発明において、有底筒状の前記
主弁の開口内縁部にストッパが設けられ、前記小弁に大
径部が設けられ、前記付勢手段により小弁の大径部が主
弁の前記ストッパに当接する状態で前記ユニットが形成
されていることを特徴とするものである。これにより、
主弁と小弁及び付勢手段のユニットの構造が単純になる
と共に、前記付勢手段により小弁の大径部を主弁の前記
ストッパに当接するように組み付ければよいため、該ユ
ニットの組立自体も簡単に行うことができる。According to a third aspect of the present invention, in the first or second aspect of the present invention, a stopper is provided at an opening inner edge of the bottomed cylindrical main valve, and the small valve has a large size. A diameter portion is provided, and the unit is formed in a state where the large diameter portion of the small valve comes into contact with the stopper of the main valve by the urging means. This allows
The structure of the unit of the main valve, the small valve and the urging means is simplified, and the large diameter portion of the small valve may be assembled so as to abut the stopper of the main valve by the urging means. Assembly itself can be easily performed.
【０００８】また、本願請求項４に記載の発明は、請求
項３に記載された発明において、前記大径部は円盤状部
材が小弁に固定されたものであることを特徴とするもの
である。これにより、大径部はフランジ状にして単に小
弁に取り付け固定するだけであるため、大径部を簡単に
設けることができる。According to a fourth aspect of the present invention, in the third aspect of the invention, the large-diameter portion has a disk-shaped member fixed to a small valve. is there. Thus, the large-diameter portion is simply formed in a flange shape and is simply fixed to the small valve, so that the large-diameter portion can be easily provided.
【０００９】また、本願請求項５に記載の発明は、請求
項３又は４に記載された発明において、前記ストッパ
は、Ｃ型止め輪から成ると共に、主弁の開口内縁部に形
成された溝に係合されていることを特徴とするものであ
る。これにより、ストッパ自体の取付が簡単になるた
め、一層当該ユニット自体の組立が簡単になる。According to a fifth aspect of the present invention, in the third or fourth aspect of the present invention, the stopper comprises a C-shaped retaining ring and a groove formed in an inner edge of the opening of the main valve. Are engaged. This simplifies the mounting of the stopper itself, which further simplifies the assembly of the unit itself.
【００１０】また、本願請求項６に記載の発明は、請求
項１〜５のいずれかに記載された発明において、前記小
弁には摺動部が形成され、該摺動部が前記主弁の内部に
形成されたガイド孔に往復動可能に挿入されていること
を特徴とするものである。これにより、小弁は主弁のガ
イド孔に保持されるため、該ユニット自体の組立が容易
であるとともに、小弁を前記小弁用弁座に当接して組み
立てる時も、その組立作業が容易になる。According to a sixth aspect of the present invention, in the first aspect of the invention, a sliding portion is formed in the small valve, and the sliding portion is provided with the main valve. Is inserted reciprocally into a guide hole formed inside. As a result, the small valve is held in the guide hole of the main valve, so that the unit itself is easy to assemble, and the assembling work is also easy when the small valve abuts on the valve seat for the small valve. become.
【００１１】また、本願請求項７に記載の発明は、請求
項１〜６のいずれかに記載された発明において、前記小
弁は前記小弁用弁座に当接する部分が先端部となり、前
記小弁開閉機構内に設けられる長尺なピストンが前記小
弁の先端部に接離することにより該小弁を開閉するよう
に形成されていることを特徴とするものである。これに
より、前記従来技術（特開平６−５０３０２号公報）に
開示されたものと異なって、小弁とピストン部分が別体
に分割されているため、小弁開閉機構側との組立作業も
簡単に行える。According to a seventh aspect of the present invention, in the invention according to any one of the first to sixth aspects, a portion of the small valve abutting on the valve seat for the small valve is a tip portion, A long piston provided in the small valve opening and closing mechanism is formed so as to open and close the small valve by coming into contact with and separating from the tip of the small valve. As a result, unlike the prior art (Japanese Patent Application Laid-Open No. 6-50302), since the small valve and the piston portion are separated from each other, the assembling work with the small valve opening / closing mechanism is also simplified. Can be done.
【００１２】また、本願請求項８に記載の発明は、請求
項１〜７のいずれかに記載された発明において、前記小
弁用弁座は、小弁開閉機構のカバー体の前記ユニットが
設けられる本体との接合面より突設形成され、且つ前記
本体のユニットが挿入される孔内に嵌入して組み付けら
れるように形成されていることを特徴とするものであ
る。これにより、前記小弁開閉機構を前記ユニットが設
けられる本体に取り付ける際に、前記小弁用弁座の突出
部分を利用して前記本体に対する位置決めができるた
め、組立作業が容易になる。According to an eighth aspect of the present invention, in the first aspect of the present invention, the small valve seat is provided with the unit of the cover body of the small valve opening / closing mechanism. The main body is formed so as to protrude from a joint surface with the main body to be inserted, and is formed so as to be fitted and assembled in a hole into which a unit of the main body is inserted. Accordingly, when the small valve opening / closing mechanism is attached to the main body in which the unit is provided, positioning with respect to the main body can be performed using the protruding portion of the small valve seat, thereby facilitating the assembly operation.
【００１３】また、本願請求項９に記載の発明は、請求
項１〜８のいずれかに記載された発明において、前記ロ
ック弁は方向切換弁に用いられるものであり、前記小弁
開閉機構のカバー体と前記方向切換弁のスプールのカバ
ー体とが一体のもので形成されていることを特徴とする
ものである。これにより、方向切換弁の本体にスプール
及び前記ユニットを組み付けた後に、両者に一体のカバ
ー体を一工程で組み付けるだけで足りるため、組立が容
易になる。According to a ninth aspect of the present invention, in the first aspect of the invention, the lock valve is used for a directional switching valve, and the small valve opening / closing mechanism is provided. The cover body and the cover body of the spool of the direction switching valve are formed integrally. Thereby, after assembling the spool and the unit to the main body of the directional control valve, it is sufficient to assemble the cover body integral with both in one step, so that the assembling becomes easy.
【００１４】また、本願請求項１０に記載の発明は、本
体に形成されたアクチュエータポートとタンク通路との
油の通路を開閉可能な主弁と、この主弁を閉弁方向に押
圧する背圧が導入される圧力室と、小弁開閉機構から圧
力を受けた時に小弁用弁座から離れて前記圧力室内の圧
油の密閉状態を開放する小弁と、前記主弁と小弁との間
に設けられて両者を相対的に離反する方向に付勢する付
勢手段とを備えたロック弁において、前記主弁は有底筒
状に形成され、前記小弁はほぼ全体が前記主弁の筒内に
配置されていることを特徴とするものである。これによ
り、小弁は主弁を構成する筒内に配置されているため、
軸方向の長さを短くでき、軸方向に小型化することがで
きる。According to a tenth aspect of the present invention, there is provided a main valve capable of opening and closing an oil passage between an actuator port formed in a main body and a tank passage, and a back pressure for pressing the main valve in a valve closing direction. And a small valve for opening the sealed state of the pressure oil in the pressure chamber apart from the small valve seat when receiving pressure from the small valve opening / closing mechanism, and the main valve and the small valve. A lock valve provided between the main valve and a biasing means for biasing the main valve in a direction in which the main valve is relatively separated from the main valve; Characterized by being arranged in a cylinder. Thereby, since the small valve is arranged in the cylinder constituting the main valve,
The length in the axial direction can be reduced, and the size can be reduced in the axial direction.
【００１５】[0015]
【発明の実施の形態】以下、本発明に係るロック弁の一
実施の形態を図１に基づいて詳細に説明する。このロッ
ク弁は、方向切換弁のスプール１が設けられる本体２の
弁孔３内に設けられ、該本体２に形成されたアクチュエ
ータポート４とタンク通路５との油の通路６を開閉する
ための主弁７と、この主弁７を閉弁方向に押圧する背圧
が導入される圧力室８と、小弁開閉機構９から圧力を受
けた時に小弁用弁座１０から離れて圧力室８内の圧油の
密閉状態を開放する小弁１１と、前記主弁７と小弁１１
との間に設けられて両者を相対的に離反する方向に付勢
するバネ１２とを備えている。前記主弁７は、前記圧力
室８の背圧（圧力室８に導入されたアクチュエータポー
ト４の圧力）により前記通路６に設けられた主弁用弁座
１３に押し付けられることにより該通路６を閉じるよう
に形成されている。圧力室８は、前記主弁７が主弁用弁
座１３に当接した状態で且つ前記小弁１１が小弁開閉機
構９側の小弁用弁座１０に押し付けられることにより、
その密閉状態が維持されるように形成されている。そし
て、主弁７と小弁１１とはそれぞれ主弁用弁座１３と小
弁用弁座１０に前記バネ１２の付勢力によって押し付け
られるように形成されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a lock valve according to the present invention will be described below in detail with reference to FIG. This lock valve is provided in a valve hole 3 of a main body 2 provided with a spool 1 of a directional switching valve, and is used to open and close an oil passage 6 between an actuator port 4 formed in the main body 2 and a tank passage 5. A main valve 7, a pressure chamber 8 into which a back pressure for pressing the main valve 7 in a valve closing direction is introduced, and a pressure chamber 8 which is separated from a small valve seat 10 when receiving pressure from a small valve opening / closing mechanism 9. A small valve 11 for opening the sealed state of the pressure oil inside the main valve 7 and the small valve 11
And a spring 12 provided between the first and second springs to bias the two in a direction in which they are relatively separated from each other. The main valve 7 is pressed against the main valve seat 13 provided in the passage 6 by the back pressure of the pressure chamber 8 (the pressure of the actuator port 4 introduced into the pressure chamber 8), so that the passage 6 is closed. It is formed to close. The pressure chamber 8 is configured such that the main valve 7 is in contact with the main valve seat 13 and the small valve 11 is pressed against the small valve seat 10 on the small valve opening and closing mechanism 9 side.
It is formed so that the sealed state is maintained. The main valve 7 and the small valve 11 are formed so as to be pressed against the valve seat 13 for the main valve and the valve seat 10 for the small valve by the urging force of the spring 12, respectively.
【００１６】当該ロック弁は、前記主弁７、小弁１１お
よびバネ１２が一体のユニット１５に形成された状態
で、前記弁孔３内に組み込まれている。すなわち、主弁
７、小弁１１およびバネ１２を弁孔３内に個別に組み付
けるのではなく、予めそれらを一体のユニット１５に組
み立てた状態で一纏めにして弁孔３内に組み付けるよう
に形成されている。The lock valve is incorporated in the valve hole 3 in a state where the main valve 7, the small valve 11, and the spring 12 are formed in an integrated unit 15. That is, the main valve 7, the small valve 11, and the spring 12 are formed so as not to be individually assembled in the valve hole 3, but to be assembled together in a state where they are assembled in an integral unit 15 in advance. ing.
【００１７】本実施の形態では、前記主弁７は、有底筒
状に形成され、前記小弁１１はその先端部１６以外の略
全体が該主弁７の筒内に配置されている。そして、当該
ユニット１５は、有底筒状の主弁７の開口内縁部にスト
ッパ１７が設けられ、前記小弁１１に大径部１８が設け
られ、前記バネ１２により小弁１１の大径部１８が前記
ストッパ１７の内面に当接する状態で組み立てられる。
図１においては、当該ユニット１５が弁孔３内に組み付
けられ、且つ小弁１１の先端部１６が前記バネ１２の付
勢力に抗して小弁用弁座１０に押し付けられるため、小
弁１１の大径部１８は前記ストッパ１７から少し離間し
た状態で保持されている。In the present embodiment, the main valve 7 is formed in a cylindrical shape with a bottom, and the small valve 11 is disposed substantially entirely inside the cylinder of the main valve 7 except for the distal end portion 16 thereof. The unit 15 is provided with a stopper 17 at the inner edge of the opening of the bottomed cylindrical main valve 7, a large-diameter portion 18 at the small valve 11, and a large-diameter portion of the small valve 11 by the spring 12. 18 is assembled with the stopper 17 in contact with the inner surface of the stopper 17.
In FIG. 1, the unit 15 is assembled in the valve hole 3, and the distal end portion 16 of the small valve 11 is pressed against the small valve seat 10 against the urging force of the spring 12. The large diameter portion 18 is held in a state of being slightly separated from the stopper 17.
【００１８】更に上記実施の形態では、小弁１１の前記
大径部１８は円盤状部材が小弁に固定された構造に形成
されている。すなわち、薄い円盤が別個に形成され、そ
れを小弁１１の外面に固定したものである。また、前記
ストッパ１７は、Ｃ型止め輪から成ると共に、当該Ｃ型
止め輪を主弁７の開口内縁部に形成された溝（図示せ
ず）に係合することにより構成されている。前記小弁１
１には摺動部１９が形成され、該摺動部１９が主弁７の
内部に螺着された小弁ガイド２０のガイド孔２１に往復
動可能に挿入されている。Further, in the above embodiment, the large diameter portion 18 of the small valve 11 is formed in a structure in which a disk-shaped member is fixed to the small valve. That is, a thin disk is separately formed and fixed to the outer surface of the small valve 11. The stopper 17 is formed of a C-shaped retaining ring, and is configured by engaging the C-shaped retaining ring with a groove (not shown) formed at the inner edge of the opening of the main valve 7. The small valve 1
A sliding portion 19 is formed in 1, and the sliding portion 19 is reciprocally inserted into a guide hole 21 of a small valve guide 20 screwed inside the main valve 7.
【００１９】尚、上記実施の形態では、ユニット１５
は、弁孔３内への組み付け前の状態においても、バネ１
２により小弁１１の大径部１８が前記ストッパ１７の内
面に当接する構造であるが、必ずしもその必要は無い。
バネ１２は、機能上は当該ユニット１５が弁孔３内に組
み付けられ且つ小弁１１の先端部１８が小弁用弁座１０
に当接した状態で付勢状態になればよいため、組み付け
前のユニット単体の状態ではバネ１２は伸縮の無い自然
長の非付勢状態であって、前記小弁１１の大径部１８が
ストッパ１７の内面に押し付けられていなくともよい。
ただ、組み付け前の状態で当該バネ１２が付勢状態にな
る構造の方が当該ユニット１５の構成部材間にガタツキ
が無いため、取り扱いやすい。In the above embodiment, the unit 15
Is the spring 1 even before being assembled in the valve hole 3.
2, the large diameter portion 18 of the small valve 11 is in contact with the inner surface of the stopper 17, but this is not always necessary.
The function of the spring 12 is that the unit 15 is assembled in the valve hole 3 and the distal end portion 18 of the small valve 11 is attached to the small valve seat 10.
The spring 12 is in a non-biased state of a natural length without expansion and contraction in a unit state before assembly, and the large diameter portion 18 of the small valve 11 The stopper 17 does not need to be pressed against the inner surface.
However, the structure in which the spring 12 is in a biased state before assembly is easier to handle because there is no backlash between the constituent members of the unit 15.
【００２０】次に、小弁開閉機構９について説明する。
小弁開閉機構９は、小弁用弁座１０に当接した状態にあ
る小弁１１に前記バネ１２の付勢力および圧力室８の背
圧に抗して圧力を加えることにより小弁１１の先端部１
６を小弁用弁座１０から離座させ、それにより前記圧力
室８内の密閉状態を開放するためのものである。これに
より、圧力室８は絞り２９を介してアクチュエータポー
ト４に連通しているから、圧力室８の背圧がアクチュエ
ータポート４の圧力よりも低くなり、アクチュエータポ
ート４の圧力により主弁７が主弁座１３から離れる。前
記小弁１１の先端部１６に圧力を加えるための長尺なピ
ストン２２は、筒状部材２３内に設けられ、前記小弁用
弁座１０は該筒状部材２３の一端側開口部に形成されて
いる。この開口部により圧力室８内は筒状部材２３の内
部通路２４と連通できるようになっている。この内部通
路２４はドレンポート３０に連通しており、ドレンポー
ト３０を介してタンクに連通している。Next, the small valve opening / closing mechanism 9 will be described.
The small valve opening / closing mechanism 9 applies a pressure to the small valve 11 in contact with the small valve seat 10 against the urging force of the spring 12 and the back pressure of the pressure chamber 8. Tip 1
6 is to be separated from the valve seat 10 for the small valve, thereby opening the sealed state in the pressure chamber 8. As a result, the pressure chamber 8 communicates with the actuator port 4 via the throttle 29, so that the back pressure of the pressure chamber 8 becomes lower than the pressure of the actuator port 4, and the pressure of the actuator port 4 causes the main valve 7 to become main. Move away from the valve seat 13. A long piston 22 for applying pressure to the distal end portion 16 of the small valve 11 is provided in a cylindrical member 23, and the small valve seat 10 is formed at an opening on one end side of the cylindrical member 23. Have been. The opening allows the inside of the pressure chamber 8 to communicate with the internal passage 24 of the tubular member 23. The internal passage 24 communicates with the drain port 30, and communicates with the tank via the drain port 30.
【００２１】前記ビストン２２の基端に別の大径ピスト
ン２５がバネ２６を介して設けられ、バネ２６によりを
子弁の閉弁方向に付勢されている。また、カバー体２７
に形成されたパイロットポート３１を介して、大径ピス
トン２５を子弁の開弁方向に押圧する圧油が導入され
る。この実施の形態では、前記小弁用弁座１０が設けら
れている筒状部材２３の一端部は、小弁開閉機構９のカ
バー体２７と前記ユニット１５が設けられる本体２との
接合面２８より突設形成され、且つ前記本体２のユニッ
ト１５が挿入される弁孔３内に嵌入して組み付けられる
ように形成されている。更に、この実施の形態では、当
該ロック弁は前記の如く方向切換弁に用いられるもので
あると共に、前記小弁開閉機構９のカバー体２７は方向
切換弁のスプール１のカバー体を兼ねるように一体成形
により形成されている。尚、ブームシリンダやアームシ
リンダをロックするロック弁としての機能及びその具体
的構造は、基本的に本願出願人が既に出願した特開平６
−２０７６０４号公報に記載されているものと同様であ
る。Another large-diameter piston 25 is provided at the base end of the biston 22 via a spring 26, and the spring 26 urges the piston in the child valve closing direction. Also, the cover body 27
The pressure oil which presses the large-diameter piston 25 in the opening direction of the slave valve is introduced through a pilot port 31 formed in the valve. In this embodiment, one end of the cylindrical member 23 provided with the small valve seat 10 is provided with a joining surface 28 between the cover body 27 of the small valve opening / closing mechanism 9 and the main body 2 provided with the unit 15. The main body 2 is formed so as to be protruded and fitted into the valve hole 3 into which the unit 15 of the main body 2 is inserted. Further, in this embodiment, the lock valve is used for the direction switching valve as described above, and the cover 27 of the small valve opening / closing mechanism 9 also serves as the cover of the spool 1 of the direction switching valve. It is formed by integral molding. The function and specific structure of the lock valve for locking the boom cylinder and the arm cylinder are basically described in Japanese Patent Application Laid-Open No.
It is the same as that described in -207604.
【００２２】次に、上記実施の形態に係るロック弁の作
用を説明する。本実施の形態によれば、主弁７、小弁１
１及びバネ１２は、予め一体のユニット１５に形成され
ているので、組立作業はこのユニット１５を本体２の弁
孔３内に組み込むことにより単一の工程で行える。従っ
て、従来のように主弁７、小弁１１及びバネ１２を個別
に弁孔３内の組み付ける工程は無くなるため、バネ１２
の屈曲の恐れが無いのは勿論、特別の熟練を要さず簡単
に組み立てることができる。また、小弁１１の略全体が
有底筒状の前記主弁７の筒内に配置されているものは、
主弁７と小弁１１を軸方向でラップさせることができる
ため、軸方向に対して短くなり、小型化することができ
る。Next, the operation of the lock valve according to the above embodiment will be described. According to the present embodiment, the main valve 7 and the small valve 1
Since the unit 1 and the spring 12 are formed in an integrated unit 15 in advance, the assembling operation can be performed in a single step by incorporating the unit 15 into the valve hole 3 of the main body 2. Therefore, there is no need to separately assemble the main valve 7, the small valve 11 and the spring 12 in the valve hole 3 as in the prior art.
Of course, there is no fear of bending, and it can be easily assembled without special skill. In addition, almost all of the small valve 11 is arranged in the cylinder of the main valve 7 having a bottomed cylindrical shape.
Since the main valve 7 and the small valve 11 can be wrapped in the axial direction, the length can be shortened in the axial direction and the size can be reduced.
【００２３】また、バネ１２により小弁１１の大径部１
８が主弁７のストッパ１７に当接する状態で当該ユニッ
ト１５が形成されているものは、主弁７と小弁１１及び
バネ１２からなるユニット自体の構造が単純になると共
に、バネ１２により小弁１１の大径部１８を主弁７のス
トッパ１７に当接するように組み付けるだけで組立でき
るため、該ユニット１５の組立自体も簡単になる。ま
た、前記大径部１８が円盤状部材を小弁１１に固定する
ことにより形成されているものは、フランジ状の大径部
１８を単に小弁１１に取り付け固定するだけであるた
め、大径部１８を簡単に設けることができる。また、Ｃ
型止め輪から成るストッパ１７を主弁７の開口内縁部に
形成された溝に係合したものは、ストッパ１７自体の取
付が簡単になるため、一層当該ユニット自体の組立が簡
単になる。The large diameter portion 1 of the small valve 11 is formed by a spring 12.
When the unit 15 is formed in a state in which the unit 8 contacts the stopper 17 of the main valve 7, the structure of the unit itself consisting of the main valve 7, the small valve 11 and the spring 12 is simplified, and the unit The unit 15 can be assembled simply by assembling the large-diameter portion 18 of the valve 11 so as to abut the stopper 17 of the main valve 7, so that the assembly itself of the unit 15 is also simplified. In the case where the large-diameter portion 18 is formed by fixing the disc-shaped member to the small valve 11, the flange-shaped large-diameter portion 18 is simply attached to the small valve 11 and fixed. The part 18 can be easily provided. Also, C
When the stopper 17 formed of a mold retaining ring is engaged with the groove formed in the inner edge of the opening of the main valve 7, the mounting of the stopper 17 itself becomes simpler, so that the assembly of the unit itself is further simplified.
【００２４】また、前記小弁１１に摺動部１９が形成さ
れ、該摺動部１９が主弁７の内部に形成されたガイド孔
２１に往復動可能に挿入されているものは、ユニット組
立時に当該小弁１１は主弁７のガイド孔２１に保持され
るため、該ユニット１５自体の組立が容易であると共
に、小弁１１を小弁用弁座１０に当接して組み立てる時
も、その組立作業が容易になる。また、前記小弁１１は
小弁用弁座１０に当接する部分が先端部１６となり、小
弁開閉機構９内に設けられる長尺なピストン２２が前記
小弁１１の先端部１６に接離することにより該小弁１１
を開閉するように形成されているものは、前記従来技術
（特開平６−５０３０２号公報）に開示されたものと異
なって、小弁１１とピストン２２部分が別体に分割され
ているため、小弁開閉機構９側との組立作業も簡単に行
える。The small valve 11 has a sliding portion 19 formed therein, and the sliding portion 19 is reciprocally inserted into a guide hole 21 formed inside the main valve 7. Since the small valve 11 is sometimes held in the guide hole 21 of the main valve 7, it is easy to assemble the unit 15 itself, and when the small valve 11 is brought into contact with the small valve seat 10, the assembly is Assembly work becomes easier. Further, the small valve 11 has a tip portion 16 at a portion in contact with the small valve seat 10, and a long piston 22 provided in the small valve opening / closing mechanism 9 comes into contact with and separates from the tip portion 16 of the small valve 11. The small valve 11
Unlike the one disclosed in the above-mentioned prior art (Japanese Patent Laid-Open No. 6-50302), the small valve 11 and the piston 22 are separately formed. Assembly work with the small valve opening / closing mechanism 9 can be easily performed.
【００２５】また、小弁用弁座１０は、小弁開閉機構９
のカバー体２７と前記ユニット１５が設けられる本体２
との接合面２８より突設形成され、且つ本体２の弁孔３
内に嵌入して組み付けられるものは、小弁開閉機構９を
前記ユニット１５が設けられる本体２に取り付ける際
に、小弁用弁座１０の突出部分を利用して前記本体２に
対する位置決めができるため、組立作業が容易になる。
また、小弁開閉機構９のカバー体２７を前記方向切換弁
のスプール１のカバー体を兼ねるように一体成形により
形成されているものは、方向切換弁の本体２にスプール
１及び前記ユニット１５を組み付けた後に、両者に一体
のカバー体２７を一工程で組み付けるだけで足りるた
め、組立が容易になる。The small valve seat 10 is provided with a small valve opening / closing mechanism 9.
Body 2 provided with cover unit 27 and unit 15
And the valve hole 3 of the main body 2
When the small valve opening / closing mechanism 9 is attached to the main body 2 on which the unit 15 is provided, the small valve opening / closing mechanism 9 can be positioned with respect to the main body 2 by using the projecting portion of the small valve seat 10. , Assembly work becomes easier.
In the case where the cover 27 of the small valve opening / closing mechanism 9 is integrally formed so as to also serve as the cover of the spool 1 of the direction switching valve, the spool 1 and the unit 15 are attached to the body 2 of the direction switching valve. After assembling, it is sufficient to assemble the cover 27 integral with the both in one step, so that the assembling becomes easier.
【００２６】次に、本願発明の他の実施の形態を説明す
る。上記実施の形態では、主弁７、小弁１１及びバネ１
２を一体にユニット化したものについて説明したが、こ
の実施の形態では、これらをユニット化せず、個別のま
まで組み付けるが、前記主弁７は有底筒状に形成され、
前記小弁１１はほぼ全体が前記主弁の筒内に配置されて
いることを特徴とする。すなわち、図１において、スト
ッパ１７を省いた状態のものに相当する。この実施の形
態では、個別組付けであるため、バネ１２の屈曲の恐れ
は残るが、主弁７と小弁１１の相対配置を軸方向でラッ
プさせることができるため、従来技術に比して軸方向に
小型化できる効果が得られる。Next, another embodiment of the present invention will be described. In the above embodiment, the main valve 7, the small valve 11, and the spring 1
2 has been described as a unit, but in this embodiment, these are not unitized but are assembled as they are individually, but the main valve 7 is formed in a bottomed cylindrical shape,
The small valve 11 is characterized in that substantially the entirety thereof is arranged in the cylinder of the main valve. That is, it corresponds to a state in which the stopper 17 is omitted in FIG. In this embodiment, since there is a possibility that the spring 12 may be bent because of the individual assembling, the relative arrangement of the main valve 7 and the small valve 11 can be wrapped in the axial direction. The effect of reducing the size in the axial direction is obtained.
【００２７】[0027]
【発明の効果】本発明によれば、主弁、小弁および付勢
手段は、予め一体のユニットに形成され、組立作業はこ
のユニットを組み込むことにより単一の工程で行えるた
め、バネの屈曲の恐れが無いのは勿論、特別の熟練を要
さず簡単に組み立てることができる。また、主弁と小弁
を軸方向でラップさせて配置したものは、軸方向に対し
て短く、即ち小型化することができる。According to the present invention, the main valve, the small valve and the biasing means are formed in an integral unit in advance, and the assembling operation can be performed in a single step by incorporating this unit. Of course, there is no danger, and it can be easily assembled without special skill. In addition, the main valve and the small valve that are arranged so as to be wrapped in the axial direction can be shortened in the axial direction, that is, can be reduced in size.
【図１】本発明の一実施の形態に係るロック弁の要部断
面図である。FIG. 1 is a sectional view of a main part of a lock valve according to an embodiment of the present invention.
１ スプール ２ 本体（方向切換弁の） ３ 弁孔 ４ アクチュエータポート ５ タンク通路 ６ 通路 ７ 主弁 ８ 圧力室 ９ 小弁開閉機構 １０ 小弁用弁座 １１ 小弁 １２ バネ １３ 主弁用弁座 １５ ユニット １６ 先端部 １７ ストッパ １８ 大径部 １９ 摺動部 ２１ ガイド孔 ２２ ピストン ２７ カバー体 ２８ 接合面 DESCRIPTION OF SYMBOLS 1 Spool 2 Main body (of directional switching valve) 3 Valve hole 4 Actuator port 5 Tank passage 6 Passage 7 Main valve 8 Pressure chamber 9 Small valve opening / closing mechanism 10 Small valve seat 11 Small valve 12 Spring 13 Main valve seat 15 Unit 16 Tip part 17 Stopper 18 Large diameter part 19 Sliding part 21 Guide hole 22 Piston 27 Cover body 28 Joining surface
───────────────────────────────────────────────────── フロントページの続き (72)発明者 三木 崇 兵庫県神戸市西区福吉台１丁目1617番１株 式会社ナブコ西神工場内 Ｆターム(参考） 3H060 AA02 BB03 CC22 CC29 DC05 DD02 3H089 AA59 BB27 CC01 DB43 GG02 HH05 JJ02 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takashi Miki 1-1161, Fukuyoshidai, Nishi-ku, Kobe-shi, Hyogo F-term in Nabco Seishin Plant (reference) 3H060 AA02 BB03 CC22 CC29 DC05 DD02 3H089 AA59 BB27 CC01 DB43 GG02 HH05 JJ02
Claims (10)
とタンク通路との油の通路を開閉する主弁と、この主弁
を閉弁方向に押圧する背圧が導入される圧力室と、小弁
開閉機構から圧力を受けた時に小弁用弁座から離れて前
記圧力室内の圧油の密閉状態を開放する小弁と、前記主
弁と小弁との間に設けられて両者を相対的に離反する方
向に付勢する付勢手段とを備えたロック弁において、前
記主弁、小弁および付勢手段は一体のユニットに形成さ
れた状態で組み込まれていることを特徴とするロック
弁。1. A main valve for opening and closing an oil passage between an actuator port formed in a main body and a tank passage, a pressure chamber for introducing a back pressure for pressing the main valve in a valve closing direction, and a small valve opening and closing. A small valve that is separated from the valve seat for the small valve when receiving pressure from the mechanism to open the sealed state of the pressure oil in the pressure chamber, and is provided between the main valve and the small valve to relatively separate the two. And a biasing means for biasing the main valve, the small valve and the biasing means in a state formed as an integral unit.
に形成され、前記小弁は略全体が前記主弁の筒内に配置
されていることを特徴とするロック弁。2. The lock valve according to claim 1, wherein the main valve is formed in a bottomed cylindrical shape, and the small valve is disposed substantially entirely within a cylinder of the main valve.
記主弁の開口内縁部にストッパが設けられ、前記小弁に
大径部が設けられ、前記付勢手段により小弁の大径部が
主弁の前記ストッパに当接する状態で前記ユニットが形
成されていることを特徴とするロック弁。3. The small valve according to claim 1, wherein a stopper is provided at an inner edge of the opening of the bottomed cylindrical main valve, a large diameter portion is provided at the small valve, and the small valve is enlarged by the urging means. A lock valve, wherein the unit is formed in a state where a diameter portion contacts the stopper of the main valve.
部材が小弁に固定されたものであることを特徴とするロ
ック弁。4. The lock valve according to claim 3, wherein the large-diameter portion has a disc-shaped member fixed to a small valve.
は、Ｃ型止め輪から成ると共に、主弁の開口内縁部に形
成された溝に係合されていることを特徴とするロック
弁。5. The lock valve according to claim 3, wherein the stopper comprises a C-shaped retaining ring, and is engaged with a groove formed in an inner edge of the opening of the main valve.
小弁には摺動部が形成され、該摺動部が前記主弁の内部
に形成されたガイド孔に往復動可能に挿入されているこ
とを特徴とするロック弁。6. The small valve according to claim 1, wherein a sliding portion is formed in the small valve, and the sliding portion is reciprocally inserted into a guide hole formed inside the main valve. A lock valve, comprising:
小弁は前記小弁用弁座に当接する部分が先端部となり、
前記小弁開閉機構内に設けられる長尺なピストンが前記
小弁の先端部に接離することにより該小弁を開閉するよ
うに形成されていることを特徴とするロック弁。7. The small valve according to claim 1, wherein a portion of the small valve abutting on the valve seat for the small valve is a tip portion,
A lock valve, wherein a long piston provided in the small valve opening / closing mechanism is formed so as to open and close the small valve by coming into contact with and separating from a tip portion of the small valve.
小弁用弁座は、小弁開閉機構のカバー体の前記ユニット
が設けられる本体との接合面より突設形成され、且つ前
記本体のユニットが挿入される孔内に嵌入して組み付け
られるように形成されていることを特徴とするロック
弁。8. The small valve seat according to claim 1, wherein the valve seat for the small valve is formed so as to protrude from a joint surface of a cover body of the small valve opening / closing mechanism with a main body on which the unit is provided, and the main body is provided. The lock valve is formed so as to be fitted and assembled in a hole into which the unit is inserted.
ロック弁は方向切換弁に用いられるものであり、前記小
弁開閉機構のカバー体と前記方向切換弁のスプールのカ
バー体とが一体のもので形成されていることを特徴とす
るロック弁。9. The lock valve according to claim 1, wherein the lock valve is used for a direction switching valve, and a cover body of the small valve opening / closing mechanism and a cover body of a spool of the direction switching valve are integrated. A lock valve characterized by being formed of:
トとタンク通路との油の通路を開閉可能な主弁と、この
主弁を閉弁方向に押圧する背圧が導入される圧力室と、
小弁開閉機構から圧力を受けた時に小弁用弁座から離れ
て前記圧力室内の圧油の密閉状態を開放する小弁と、前
記主弁と小弁との間に設けられて両者を相対的に離反す
る方向に付勢する付勢手段とを備えたロック弁におい
て、前記主弁は有底筒状に形成され、前記小弁はほぼ全
体が前記主弁の筒内に配置されていることを特徴とする
ロック弁。10. A main valve capable of opening and closing an oil passage between an actuator port formed in a main body and a tank passage, a pressure chamber into which a back pressure for pressing the main valve in a valve closing direction is introduced,
A small valve that is apart from the valve seat for the small valve when receiving pressure from the small valve opening / closing mechanism and opens the sealed state of the pressure oil in the pressure chamber; The main valve is formed in a bottomed cylindrical shape, and the small valve is disposed substantially entirely within the cylinder of the main valve. A lock valve, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25330898A JP3648675B2 (en) | 1998-08-25 | 1998-08-25 | Lock valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25330898A JP3648675B2 (en) | 1998-08-25 | 1998-08-25 | Lock valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000065228A true JP2000065228A (en) | 2000-03-03 |
| JP3648675B2 JP3648675B2 (en) | 2005-05-18 |
Family
ID=17249496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25330898A Expired - Fee Related JP3648675B2 (en) | 1998-08-25 | 1998-08-25 | Lock valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3648675B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102889261B (en) * | 2012-10-15 | 2015-02-04 | 常德中联重科液压有限公司 | Balancing valve, hydraulic cylinder telescoping control loop and hydraulic device |
-
1998
- 1998-08-25 JP JP25330898A patent/JP3648675B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3648675B2 (en) | 2005-05-18 |
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