JP2002061762A - Direct acting type relief valve - Google Patents
Direct acting type relief valveInfo
- Publication number
- JP2002061762A JP2002061762A JP2000253621A JP2000253621A JP2002061762A JP 2002061762 A JP2002061762 A JP 2002061762A JP 2000253621 A JP2000253621 A JP 2000253621A JP 2000253621 A JP2000253621 A JP 2000253621A JP 2002061762 A JP2002061762 A JP 2002061762A
- Authority
- JP
- Japan
- Prior art keywords
- diameter hole
- poppet valve
- valve body
- small
- annular gap
- 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)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、直動型リリーフ弁
に関するものであり、特に、安定したダンピング力が得
られ、しかも、オーバライド特性等の静特性のばらつき
を抑えられる直動型リリーフ弁に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct acting relief valve, and more particularly to a direct acting relief valve capable of obtaining a stable damping force and suppressing variations in static characteristics such as override characteristics. Things.
【０００２】[0002]
【従来の技術】この種の直動型リリーフ弁としては、特
開平２７２７０７３号公報に記載されたものがある。2. Description of the Related Art A direct-acting type relief valve of this type is disclosed in Japanese Patent Application Laid-Open No. 2727073.
【０００３】この直動型リリーフ弁は、スプリングでハ
ウジングのバルブシートに押付けられるポペット弁体の
先端側を延長してハウジングの穴に摺動自在に嵌合さ
せ、この嵌合部に第２リリーフ弁を形成して、開弁時に
第１リリーフ弁に生ずるフローフォースを、第２リリー
フ弁の作動でポペット弁体先端部に生じる圧力により得
られる軸方向力で相殺するようにして、オーバライド特
性を向上するようにしたものである。[0003] In this direct acting relief valve, a front end of a poppet valve body pressed against a valve seat of a housing by a spring is extended and slidably fitted in a hole of the housing. By forming a valve, the flow force generated in the first relief valve when the valve is opened is offset by the axial force obtained by the pressure generated at the tip of the poppet valve body by the operation of the second relief valve, so that the override characteristic is improved. It is intended to be improved.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、この直
動型リリーフ弁にあっては、ポペット弁体の先端側はハ
ウジングに摺動自在に嵌合されて軸方向に案内されるも
のであるが、バルブシートに着座する弁体部はハウジン
グから半径方向には拘束されない、所謂片持ち構造であ
るため、横方向の振れやリリーフ噴流に基づく横力、出
口の非対称性の影響、ポペット弁体の倒れ（傾き）の影
響を受けやすいものとなっていた。However, in this direct-acting type relief valve, the distal end side of the poppet valve body is slidably fitted in the housing and guided in the axial direction. The valve body seated on the valve seat has a so-called cantilever structure that is not constrained in the radial direction from the housing. Therefore, lateral force due to lateral deflection or relief jet, asymmetry of the outlet, falling of the poppet valve body. (Tilt).
【０００５】また、ポペット弁体の軸方向への移動に対
しても、減衰を与える手段を備えていないため、過渡的
な状態で安定性に欠けるものであった。In addition, since the poppet valve element is not provided with a means for damping the axial movement of the poppet valve element, it lacks stability in a transient state.
【０００６】上記不具合を解消するよう特開平９−１９
６１９２号公報の直動型リリーフ弁にあっては、ポペッ
ト弁体がハウジングの穴に摺動自在に嵌合され、ポペッ
ト弁体を閉弁方向に付勢するスプリングを内蔵するスプ
リング室と排出ポート側とはダンピングオリフィスを有
する通路を介して連通させている。なお、ポペット弁体
が最大開口位置に移動する場合には、前記ダンピングオ
リフィスをバイパスしてスプリング室と排出ポート側と
が連通するようにして、スプリング室内に溜まった空気
を抜けやすくしている。[0006] Japanese Patent Application Laid-Open No. 9-19 / 1993 discloses a solution to the above problem.
In the direct-acting relief valve disclosed in Japanese Patent No. 6192, a poppet valve body is slidably fitted in a hole of a housing, and a spring chamber and a discharge port containing a spring for urging the poppet valve body in a valve closing direction. The sides communicate with each other through a passage having a damping orifice. When the poppet valve moves to the maximum opening position, the spring chamber and the discharge port side are communicated with each other by bypassing the damping orifice, so that the air accumulated in the spring chamber is easily released.
【０００７】しかしながら、この直動型リリーフ弁にあ
っても、ダンピングオリフィスを有する通路はポペット
弁体を軸方向に貫通して弁体部の肩部に開口しており、
ポペット弁体の回転位置によっては、流出ポートへのリ
リーフ噴流を受けやすい位置とそうでない位置にあるか
により、言い換えると、ポペット弁体の回転位置即ちダ
ンピングオリフィスを持つ通路の開口位置の回転方向へ
の移動により、リリーフ弁のオーバライド特性が変化
し、バラツク不具合を有する。However, even in this direct acting relief valve, the passage having the damping orifice penetrates the poppet valve body in the axial direction and opens at the shoulder of the valve body.
Depending on the rotational position of the poppet valve body, depending on whether it is at a position where it is easy to receive the relief jet to the outflow port and at a position where it is not, in other words, in the rotational direction of the rotational position of the poppet valve element, that is, the opening position of the passage having the damping orifice. , The override characteristic of the relief valve changes, causing a variation problem.
【０００８】そこで本発明は、上記問題点に鑑みなされ
たもので、安定したダンピング力が得られ、しかも、オ
ーバライド特性等の静特性のバラツキを抑えた直動型リ
リーフ弁を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a direct acting relief valve capable of obtaining a stable damping force and suppressing variations in static characteristics such as override characteristics. And
【０００９】[0009]
【課題を解決するための手段】第１の発明は、小径穴と
大径穴とからなり、小径穴を高圧の入口ポートに連通さ
せて一次圧室とすると共に大径穴を比較的低圧の排出ポ
ートに連通させ、両穴の段付部にバルブシートが形成さ
れたハウジングと、前記バルブシートに接離可能な弁体
部および前記大径穴内面に微小な環状隙間をもって臨む
ツバ部を備えたポペット弁体と、前記ハウジングの大径
穴内に配置され、ポペット弁体を前記バルブシートに着
座するよう背後から付勢するスプリングと、前記ポペッ
ト弁体のツバ部で画成された大径穴内の前記スプリング
が配置されたスプリング室を前記環状隙間を介して排出
ポート側の二次圧室に連通させて形成したダンパとから
構成したことを特徴とする。The first invention comprises a small diameter hole and a large diameter hole. The small diameter hole communicates with a high pressure inlet port to form a primary pressure chamber, and the large diameter hole has a relatively low pressure. A housing in communication with the discharge port and having a valve seat formed at the stepped portion of both holes, a valve body portion that can be brought into contact with and separated from the valve seat, and a collar portion facing the inner surface of the large-diameter hole with a small annular gap. A poppet valve element, a spring disposed in a large-diameter hole of the housing, for urging the poppet valve element from behind so as to be seated on the valve seat, and a large-diameter hole defined by a collar portion of the poppet valve element. And a damper formed by connecting the spring chamber in which the spring is disposed to the secondary pressure chamber on the discharge port side through the annular gap.
【００１０】第２の発明は、第１の発明において、前記
ツバ部は、排出ポート側の第１ツバ部とスプリング室側
の第２ツバ部と両ツバ部間の溝部とで構成され、第１ツ
バ部と大径穴内面との環状隙間を第２ツバ部と大径穴内
面との環状隙間と同等かもしくは大きく設定したことを
特徴とする。According to a second aspect of the present invention, in the first aspect, the collar portion includes a first collar portion on the discharge port side, a second collar portion on the spring chamber side, and a groove between the two collar portions. An annular gap between one flange portion and the inner surface of the large diameter hole is set to be equal to or larger than an annular gap between the second flange portion and the inner surface of the large diameter hole.
【００１１】第３の発明は、第２の発明において、前記
溝部は、第２ツバ部外周もしくは第２ツバ部と対向する
大径穴内面に円周方向の位置を異ならせて設けた切欠き
と第２ツバ部と大径穴内面の環状隙間とでスプリング室
に連通することを特徴とする。According to a third aspect of the present invention, in the second aspect, the notch is provided at the outer periphery of the second flange portion or on the inner surface of the large-diameter hole facing the second flange portion at different circumferential positions. And the second flange portion and the annular gap between the inner surface of the large-diameter hole communicate with the spring chamber.
【００１２】第４の発明は、第２の発明において、前記
溝部は、ポペット弁体に設けた連通路と第２ツバ部と大
径穴内面の環状隙間とでスプリング室に連通することを
特徴とする。According to a fourth aspect of the present invention, in the second aspect, the groove communicates with the spring chamber through a communication passage provided in the poppet valve body, an annular gap between the second flange and the inner surface of the large-diameter hole. And
【００１３】第５の発明は、第１ないし第４の発明のい
ずれか一つにおいて、前記ポペット弁体は、その弁体部
先端に前記小径穴に摺動自在に嵌合し且つ小径穴内で一
次圧室を画成する摺動部を具備することを特徴とする。In a fifth aspect based on any one of the first to fourth aspects, the poppet valve element is slidably fitted in the small-diameter hole at the tip of the valve element portion and is inserted in the small-diameter hole. It is characterized by comprising a sliding portion defining a primary pressure chamber.
【００１４】第６の発明は、第５の発明において、前記
摺動部は、前記小径穴の端部を画成して摺動部と小径穴
との隙間を介して一次圧室に連通する第２のダンパを形
成することを特徴とする。In a sixth aspect based on the fifth aspect, the sliding portion defines an end of the small diameter hole and communicates with the primary pressure chamber through a gap between the sliding portion and the small diameter hole. It is characterized in that a second damper is formed.
【００１５】第７の発明は、第１ないし第４の発明のい
ずれか一つにおいて、前記ポペット弁体は、スプリング
室に面する背面に大径穴の軸方向に延びるロッド部を備
え、このロッド部の端部はハウジングに摺動自在に案内
されていることを特徴とする。According to a seventh aspect of the present invention, in any one of the first to fourth aspects, the poppet valve body includes a rod portion extending in the axial direction of a large-diameter hole on a back surface facing the spring chamber. The end of the rod portion is slidably guided by the housing.
【００１６】[0016]
【発明の効果】したがって、第１の発明は、微小な環状
隙間をもって大径穴内面に臨むツバ部をポペット弁体に
設けたため、ポペット弁体の移動に伴うスプリング室へ
の作動流体の流入・排出時に作動流体がこの微小な環状
隙間を通過することで、ポペット弁体を大径穴内面から
浮き上がらせるよう機能し、ポペット弁体の半径方向へ
の振れや傾きを抑制し、ポペット弁体の姿勢を中立に戻
そうとするアライメント機能を有する。また、ポペット
弁体の傾き可能な角度（倒れ角）が制限される。According to the first aspect of the present invention, since the flange portion facing the inner surface of the large-diameter hole is provided on the poppet valve body with a minute annular gap, the working fluid flows into the spring chamber as the poppet valve body moves. When the working fluid passes through this minute annular gap at the time of discharge, it functions to lift the poppet valve body from the inner surface of the large-diameter hole, suppresses the swing and inclination of the poppet valve body in the radial direction, and reduces the poppet valve body. It has an alignment function to return the posture to neutral. Further, the angle at which the poppet valve body can be tilted (falling angle) is limited.
【００１７】このアライメント機能は、作動流体がバル
ブシートと弁体部との間を通過して排出ポートに至るリ
リーフ噴流によってポペット弁体には横方向に押す横力
や斜め方向の傾け力が作用するがこの振れや傾きに対抗
して姿勢を中立に維持させる。This alignment function is such that a lateral force pushing in a lateral direction or a tilting force in an oblique direction acts on the poppet valve body due to a relief jet that the working fluid passes between the valve seat and the valve body and reaches the discharge port. However, the posture is maintained neutral against the shake and the tilt.
【００１８】また、スプリング室の作動流体は前記環状
隙間を介して排出ポートに通じる二次圧室に連通してい
るため、ポペット弁体の軸方向の移動に対してそれを抑
制する減衰力を発生し、ポペット弁体の動きに対してダ
ンピング効果を発揮する。Further, since the working fluid in the spring chamber communicates with the secondary pressure chamber communicating with the discharge port through the annular gap, a damping force for suppressing the axial movement of the poppet valve body is provided. Occurs and exerts a damping effect on the movement of the poppet valve element.
【００１９】第２の発明では、前記ツバ部が第１，第２
ツバ部と両ツバ部間の溝部とで構成されるため、作動流
体が環状隙間を通過する際は流速が速く静圧は低いが、
環状隙間に比較して大きい容積の溝部に流入すれば流速
が大きく落ちてその分静圧が高くなり、ポペット弁体を
大径穴の内壁面によってバランスさせる静圧軸受けの効
果がある。In the second invention, the collar portion is provided with the first and second flanges.
When the working fluid passes through the annular gap, the flow velocity is high and the static pressure is low, because it is composed of the flange and the groove between both flanges.
If the gas flows into the groove having a larger volume than the annular gap, the flow velocity is greatly reduced, and the static pressure is increased accordingly. This has the effect of a static pressure bearing that balances the poppet valve body with the inner wall surface of the large-diameter hole.
【００２０】また、第１ツバ部と大径穴内面との環状隙
間を第２ツバ部と大径穴内面との環状隙間と同等かもし
くは大きく設定しているため、二次圧室での圧力変動を
当該環状隙間で遮断して、溝部およびそれに連なるスプ
リング室内の圧力変動を少なくできる。Since the annular gap between the first flange portion and the inner surface of the large diameter hole is set to be equal to or larger than the annular gap between the second flange portion and the inner surface of the large diameter hole, the pressure in the secondary pressure chamber is reduced. The fluctuation is blocked by the annular gap, and the pressure fluctuation in the groove and the spring chamber connected to the groove can be reduced.
【００２１】第３の発明では、前記溝部は第２ツバ部外
周の環状隙間と第２ツバ部外周もしくは大径穴内面に設
けた切欠きを介してスプリング室に連通しているため、
チョークとして機能する部分が少ないため、油温による
動粘度変化の影響を低減できる。In the third aspect of the present invention, the groove communicates with the spring chamber through a notch provided on the outer periphery of the second flange and the inner surface of the large diameter hole and the annular gap on the outer periphery of the second flange.
Since there are few portions that function as chalk, the effect of kinematic viscosity change due to oil temperature can be reduced.
【００２２】また、第１ツバ部外周の環状隙間により、
溝部は二次圧室から画成されているため、リリーフ噴流
により二次圧室内で円周方向に圧力値に偏りがある（圧
力分布が存在する）場合、第２ツバ部外周もしくは第２
ツバ部と対向する大径穴内面に設ける切欠きの円周方向
位置が変わっても、スプリング室の圧力変動を低減でき
る。Further, the annular gap around the outer periphery of the first collar portion allows
Since the groove is defined by the secondary pressure chamber, if the pressure value is deviated in the circumferential direction in the secondary pressure chamber due to the relief jet (there is a pressure distribution), the outer circumference of the second collar portion or the second flange is formed.
Even if the position of the notch provided on the inner surface of the large-diameter hole facing the flange changes in the circumferential direction, the pressure fluctuation of the spring chamber can be reduced.
【００２３】第４の発明では、前記溝部は連通路と第２
ツバ部外周の環状隙間とでスプリング室に連通している
ため、穴加工のみでダンピングオフィスが形成できるた
め、製作が容易で製作コストを低減できる。In the fourth invention, the groove is formed in the communication passage with the second passage.
Since the spring chamber communicates with the annular gap at the outer periphery of the collar, the damping office can be formed only by drilling, so that the manufacturing is easy and the manufacturing cost can be reduced.
【００２４】第５の発明では、前記ポペット弁体は前記
小径穴に摺動自在な先端の摺動部を有するため、小径穴
に摺動自在に嵌合する摺動部でポペット弁体の先端部が
案内されることで、ポペット弁体の倒れ角が制限されや
すく、横方向の振動等の影響を低減でき、より一層精度
の高いものとすることができる。In the fifth aspect of the present invention, since the poppet valve element has the sliding portion at the tip slidable in the small diameter hole, the tip of the poppet valve element is slidably fitted in the small diameter hole. By guiding the portion, the inclination angle of the poppet valve body is easily limited, the influence of lateral vibration and the like can be reduced, and the accuracy can be further improved.
【００２５】第６の発明では、前記摺動部は前記小径穴
の端部との間で摺動部周りの隙間を介して一次圧室に連
通する第２のダンパを形成しているため、ポペット弁体
の軸方向の移動を第１のダンパと共に抑制する。In the sixth aspect, the sliding portion forms the second damper communicating with the primary pressure chamber through a gap around the sliding portion between the sliding portion and the end of the small-diameter hole. The movement of the poppet valve body in the axial direction is suppressed together with the first damper.
【００２６】第７の発明では、前記ポペット弁体はロッ
ド部によりハウジングに摺動自在に案内されるため、ポ
ペット弁体のツバ部と大径穴内面との環状隙間によるア
ライメント機能と相俟って、ポペット弁の振れや倒れを
確実に防止できる。In the seventh aspect of the present invention, the poppet valve body is slidably guided by the rod into the housing, so that the poppet valve body is aligned with the alignment function by the annular gap between the flange of the poppet valve and the inner surface of the large-diameter hole. As a result, it is possible to reliably prevent the poppet valve from swinging or falling.
【００２７】[0027]
【発明の実施の態様】以下、本発明の実施態様を添付図
面に基づいて説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【００２８】図１は、本発明の直動型リリーフ弁の第１
の実施態様を示す。FIG. 1 shows a first embodiment of a direct acting relief valve according to the present invention.
Is shown.
【００２９】図１において、１０は段付形状のハウジン
グを示し、小径開口端が球形のプラグ１１で閉塞され、
比較的高圧の一次圧を入口ポート１２より導入する小径
穴１３、およびこの小径穴１３と同軸上にバルブシート
１４を挟んで位置し、大径開口端が筒状の調整プラグ１
５で閉塞され、排出ポート１６が開口する大径穴１７を
有する。In FIG. 1, reference numeral 10 denotes a stepped housing, the small-diameter opening end of which is closed by a spherical plug 11.
A small-diameter hole 13 for introducing a relatively high-pressure primary pressure from the inlet port 12, and a coaxially positioned small-diameter hole 13 with the valve seat 14 interposed therebetween, and a large-diameter opening end having a cylindrical opening shape.
5 has a large-diameter hole 17 in which the discharge port 16 is opened.
【００３０】３０はポペット弁体を示し、前記バルブシ
ート１４に接離可能な円錐形の弁体部３１を備え、この
弁体部３１の先端側には、ステム部３２を介して小径穴
１３内面に摺動可能に嵌合する摺動部３３が配置され
る。この摺動部３３でハウジング１０の小径穴１３の内
部は入口ポート１２が開口した一次圧室２５と、この一
次圧室２５に摺動部３３と小径穴１３との間の図示しな
い微小隙間を介して連通するダンパ室２６とに区画され
る。Reference numeral 30 denotes a poppet valve body, which has a conical valve body portion 31 that can be brought into contact with and separated from the valve seat 14. A small-diameter hole 13 is provided at the distal end of the valve body portion 31 through a stem portion 32. A sliding portion 33 is slidably fitted on the inner surface. Inside the small diameter hole 13 of the housing 10 in the sliding portion 33, a primary pressure chamber 25 in which the inlet port 12 is opened and a small gap (not shown) between the sliding portion 33 and the small diameter hole 13 are formed in the primary pressure chamber 25. And a damper chamber 26 that communicates with the damper chamber 26 via the airbag.
【００３１】また、この弁体部３１の後端側には、拡径
したランド部３４とこのランド部３４に隣接して大径穴
１７内周に微小な環状隙間δをもって外周が臨むツバ部
３５とが形成され、ツバ部３５の背面には後述するスプ
リング３７の一端に係合するロッド部３６が設けられて
いる。Further, on the rear end side of the valve element portion 31, a flange portion having an enlarged land portion 34 and an outer periphery facing a small annular gap δ on the inner periphery of the large-diameter hole 17 adjacent to the land portion 34. And a rod portion 36 which is engaged with one end of a spring 37 described later is provided on the back surface of the flange portion 35.
【００３２】スプリング３７は、ポペット弁体３０のロ
ッド部３６周りに一端が係合し、他端は捩じ込み深さを
調節可能な前記調節プラグ１５に着座している。なお、
１８は、前記調節プラグ１５のロックナット、１９はシ
ールリング、２０はワッシャである。One end of the spring 37 is engaged around the rod portion 36 of the poppet valve body 30, and the other end is seated on the adjusting plug 15 whose screwing depth can be adjusted. In addition,
Reference numeral 18 denotes a lock nut of the adjustment plug 15, reference numeral 19 denotes a seal ring, and reference numeral 20 denotes a washer.
【００３３】また、調節プラグ１５で閉塞されるハウジ
ング１０の大径穴１７の内部は、ポペット弁体３０のツ
バ部３５により、スプリング３７が配置されるスプリン
グ室２７と排出ポート１６に連通する二次圧室２８とに
区画され、スプリング室２７はポペット弁体３０のツバ
部３５による微小な環状隙間δをオリフィスとして二次
圧室２８と連通するダンパ室に構成される。The inside of the large-diameter hole 17 of the housing 10 closed by the adjustment plug 15 is connected to the spring chamber 27 in which the spring 37 is disposed and the discharge port 16 by the collar 35 of the poppet valve body 30. The spring chamber 27 is defined as a damper chamber that communicates with the secondary pressure chamber 28 using the small annular gap δ formed by the flange 35 of the poppet valve body 30 as an orifice.
【００３４】そして、リリーフ弁のセット圧力は、スプ
リング３７の初期セット荷重とバルブシート１４のシー
ト面積（受圧面積）で決定でき、スプリング３７の所期
セット荷重は調節プラグ１５のねじ込み深さを加減する
ことにより調節できる。The set pressure of the relief valve can be determined by the initial set load of the spring 37 and the seat area (pressure receiving area) of the valve seat 14. The desired set load of the spring 37 is adjusted by adjusting the screwing depth of the adjusting plug 15. Can be adjusted.
【００３５】次に、作用を説明する。Next, the operation will be described.
【００３６】今、入口ポート１２を介して一次圧室２５
に導かれた作動流体の圧力が、スプリング３７のセット
荷重に相当する圧力よりも低ければ、ポペット弁体３０
は図示するノーマル状態（閉弁状態）を維持して、弁体
部３１はバルブシート１４への着座している。Now, through the inlet port 12, the primary pressure chamber 25
Is lower than the pressure corresponding to the set load of the spring 37, the poppet valve 30
The valve body 31 is seated on the valve seat 14 while maintaining the illustrated normal state (valve closed state).
【００３７】前記一次圧室２５の圧力が、スプリング３
７のばね力に相当する圧力よりも高くなれば、ポペット
弁体３０がスプリング３７に抗して移動し、ハウジング
１０のバルブシート１４から弁体部３１を離脱させて開
く。従って、入口ポート１２側の一次圧室２５の圧力流
体が二次圧室２８へ流入し、排出ポート１６へ流れる。The pressure in the primary pressure chamber 25 is
When the pressure becomes higher than the pressure corresponding to the spring force of No. 7, the poppet valve body 30 moves against the spring 37, and the valve body 31 is detached from the valve seat 14 of the housing 10 and opened. Therefore, the pressure fluid in the primary pressure chamber 25 on the inlet port 12 side flows into the secondary pressure chamber 28 and flows to the discharge port 16.
【００３８】この開弁時において、スプリング室２７の
作動流体はポペット弁体３０の開弁方向（もしくは閉弁
方向）への移動に対してポペット弁体３０のツバ部３５
とハウジング１０の大径穴１７との間の環状隙間δを介
して二次圧室２８に排出（もしくは吸入）することでポ
ペット弁体３０の移動を抑制するダンパ機能を発揮す
る。At the time of opening the valve, the working fluid in the spring chamber 27 moves toward the valve opening direction (or the valve closing direction) of the poppet valve body 30 to prevent the flange portion 35 of the poppet valve body 30 from moving.
By discharging (or sucking) into the secondary pressure chamber 28 through the annular gap δ between the poppet valve body 30 and the large-diameter hole 17 of the housing 10, a damper function for suppressing the movement of the poppet valve body 30 is exhibited.
【００３９】また、小径穴１３と摺動部３３とで形成さ
れたダンパ室２６も上記ポペット弁体３０の移動に伴い
拡張収縮され、作動流体は摺動部３３と小径穴１３内面
との間の環状隙間を通過することで減衰されるため、ポ
ペット弁体３０の移動を抑制する第２のダンパとして機
能する。The damper chamber 26 formed by the small-diameter hole 13 and the sliding portion 33 is also expanded and contracted with the movement of the poppet valve body 30, and the working fluid is transferred between the sliding portion 33 and the inner surface of the small-diameter hole 13. Therefore, it functions as a second damper that suppresses the movement of the poppet valve element 30.
【００４０】そして、ポペット弁体３０のツバ部３５と
ハウジング１０の大径穴１７内面との間の環状隙間δ
は、ポペット弁体３０の移動に伴うスプリング室２７へ
の作動流体の流入・排出時に作動流体が通過すること
で、ポペット弁体３０を大径穴１７内面から浮き上がら
せるよう機能し、ポペット弁体３０の半径方向への振れ
や傾きを抑制し、ポペット弁体３０を直立した中立状態
に維持しようとするアライメント機能を発揮する。An annular gap δ between the flange 35 of the poppet valve body 30 and the inner surface of the large-diameter hole 17 of the housing 10.
The working fluid passes through the working fluid when it flows into and out of the spring chamber 27 in accordance with the movement of the poppet valve body 30, so that the poppet valve body 30 rises from the inner surface of the large-diameter hole 17. It exerts an alignment function of suppressing the radial run-out and tilt of the poppet 30 and maintaining the poppet valve element 30 in an upright neutral state.
【００４１】このアライメント機能は、作動流体がバル
ブシート１４と弁体部３１との間を通過して排出ポート
１６に至るリリーフ噴流によってポペット弁体３０には
横方向に押す横力や斜め方向の傾け力が作用しても、こ
れに対抗して上記中立状態に維持しようとする。The alignment function is such that the working fluid passes between the valve seat 14 and the valve body portion 31 and reaches the discharge port 16 by the relief jet, so that the poppet valve body 30 has a lateral force to be pushed in the lateral direction or an oblique direction. Even if a tilting force acts, it is attempted to maintain the neutral state in opposition thereto.
【００４２】出願人の実験によれば、ツバ部３５と大径
穴１７内面との環状隙間（直径の差）δは、δ≦Ｄ×
（１／３０）とすることで、ポペット弁体３０の振れ、
倒れを確実に防止できることを解明した。なお、Ｄは大
径穴１７の内径である。According to the experiment conducted by the applicant, the annular gap (difference in diameter) δ between the brim portion 35 and the inner surface of the large-diameter hole 17 is δ ≦ D ×
By setting (1/30), the swing of the poppet valve body 30
Clarified that falling can be reliably prevented. D is the inner diameter of the large-diameter hole 17.
【００４３】なお、ポペット弁体３０の弁体部３１は上
記図１に記載したものの他、例えば、図２に示すよう
に、ツバ部３５と隣接するランド部３４を取り除き、弁
体部３１のテーパをさらに延長することで、前記ランド
部３４の機能を持たせるようにしたものでもよい。In addition, as shown in FIG. 1, for example, as shown in FIG. 2, the land portion 34 adjacent to the brim portion 35 is removed, and the valve body portion 31 of the poppet valve body 30 is removed. The function of the land portion 34 may be provided by further extending the taper.
【００４４】また、上記ポペット弁体３０のアライメン
トは、小径穴１３に摺動自在に嵌合する摺動部３３でポ
ペット弁体３０の先端部が案内されることで、より一層
精度の高いものとすることができる。Further, the alignment of the poppet valve element 30 can be performed with higher precision by guiding the tip end of the poppet valve element 30 by the sliding portion 33 slidably fitted in the small-diameter hole 13. It can be.
【００４５】図２に示すポペット弁体では、バルブシー
ト１４と弁体部３１との間からの噴流を弁体部３１のテ
ーパの延長した部分で外方へ案内するため、上記噴流に
よる乱れを少なくできる。従って、二次圧室２８へ環状
隙間δを介して連通しているスプリング室２７の圧力変
動を更に小さくできスプリング室２７を利用するダンピ
ング効果を安定させると共に、その流体力を調整するこ
とが可能となり、オーバライド特性等の静特性を改善で
きる特徴を持つ。In the poppet valve element shown in FIG. 2, since the jet from the space between the valve seat 14 and the valve element 31 is guided outward at the tapered portion of the valve element 31, the turbulence caused by the jet is eliminated. Can be reduced. Therefore, the pressure fluctuation of the spring chamber 27 communicating with the secondary pressure chamber 28 via the annular gap δ can be further reduced, and the damping effect using the spring chamber 27 can be stabilized, and the fluid force thereof can be adjusted. And has the characteristic that static characteristics such as override characteristics can be improved.
【００４６】また、スプリング室２７は上記環状隙間δ
を通して二次圧室２８へ連通させるだけでなく、図３に
示すようにスプリング室２７を排出ポート１６の下流に
連通穴２４を介して連通させてもよい。このようにする
とこの連通穴２４を介して直接流体または混入のエアを
外部へ排出できる。Further, the spring chamber 27 is provided with the annular gap δ.
, The spring chamber 27 may be connected to the downstream of the discharge port 16 through the communication hole 24 as shown in FIG. In this way, the fluid or the mixed air can be discharged directly to the outside through the communication hole 24.
【００４７】そして、ツバ部３５と大径穴１７との環状
隙間δのみでダンピング効果を調整するよりも、さらに
連通穴２４を加えることで、ポペット弁体３０の振れ倒
れ防止の機能のために必要な開口面積に限定される環状
隙間δに加えて、連通穴２４とのトータルの開口面積を
選択できて、減衰力の調整がしやすくできる。By adjusting the damping effect only by the annular gap δ between the flange 35 and the large-diameter hole 17, the communication hole 24 is further added to prevent the poppet valve body 30 from falling over. In addition to the annular gap δ limited to the required opening area, the total opening area with the communication hole 24 can be selected, and the adjustment of the damping force can be easily performed.
【００４８】図４は本発明の直動型リリーフ弁の第２の
実施態様を示し、ポペット弁体３０のツバ部を２個設け
たものである。FIG. 4 shows a second embodiment of a direct acting relief valve according to the present invention, in which a poppet valve body 30 is provided with two flanges.
【００４９】図４において、ポペット弁体３０は二次圧
室２８側のツバ部を第１ツバ部３８、スプリング室２７
側のツバ部を第２ツバ部３９として２個のツバ部３８，
３９を小径の溝部４０を挟んで配置し、第１ツバ部３８
と大径穴１７内面との環状隙間δ１を第２ツバ部３９と
大径穴１７内面との環状隙間δ２と同等もしくは大きく
形成している。In FIG. 4, the poppet valve element 30 has a flange portion on the side of the secondary pressure chamber 28, a first flange portion 38, and a spring chamber 27.
The two brim portions 38,
39 are arranged with the small-diameter groove 40 interposed therebetween, and the first flange 38
An annular gap δ1 between the second flange 39 and the inner surface of the large diameter hole 17 is formed to be equal to or larger than an annular gap δ2 between the second flange 39 and the inner surface of the large diameter hole 17.
【００５０】この構成によれば、溝部４０がスプリング
室２７と二次圧室２８との間において上記二つの環状隙
間（オリフィス）δ１，δ２に挟まれているため、作動
流体が環状隙間δ１，δ２を通過する際は流速が速く静
圧は低いが、環状隙間δ１，δ２に比較して大きい容積
の溝部４０に流入すれば流速が大きく落ちてその分静圧
が高くなる。この現象は通称静圧軸受けの機能であり、
これによりポペット弁体３０を大径穴１７の内壁面から
更に離間させてセンタリングする機能を高める。According to this configuration, since the groove 40 is sandwiched between the two annular gaps (orifices) δ1 and δ2 between the spring chamber 27 and the secondary pressure chamber 28, the working fluid flows through the annular gaps δ1 and δ2. When passing through δ2, the flow velocity is high and the static pressure is low. However, if it flows into the groove 40 having a larger volume than the annular gaps δ1 and δ2, the flow velocity drops greatly and the static pressure increases accordingly. This phenomenon is a function of the so-called static pressure bearing,
This enhances the function of further centering the poppet valve element 30 away from the inner wall surface of the large-diameter hole 17.
【００５１】また、二次圧室２８に直接臨む第１ツバ部
３８の大径穴１７内面との環状隙間δ１をスプリング室
２７側の第２ツバ部３９の環状隙間δ２と同等かより広
くすることで、二次圧室２８での圧力変動を当該環状隙
間δ１で遮断して、溝部４０およびそれに連なるスプリ
ング室２７内の圧力変動を少なくできる。The annular gap δ1 between the inner surface of the large diameter hole 17 of the first flange 38 and the annular gap δ2 of the second flange 39 on the spring chamber 27 side is made equal to or larger than the annular gap δ2 directly facing the secondary pressure chamber 28. Thus, the pressure fluctuation in the secondary pressure chamber 28 is blocked by the annular gap δ1, and the pressure fluctuation in the groove 40 and the spring chamber 27 connected thereto can be reduced.
【００５２】上記態様では、溝部４０とスプリング室２
７との間とは第２ツバ部３９の外周の環状隙間δ２を介
して連通させているが、連通形態としてはこの例に限ら
れず、図５ないし図７に示すごとき変形例がある。In the above embodiment, the groove 40 and the spring chamber 2
7 is communicated through an annular gap δ2 on the outer periphery of the second flange 39, but the form of communication is not limited to this example, and there are modified examples as shown in FIGS.
【００５３】図５においては、第２ツバ部３９外周の環
状隙間δ２と第２ツバ部３９の円周上等間隔に配置した
切欠き４１とにより構成したものであり、図６において
は、第２ツバ部３９外周の環状隙間δ２と第２ツバ部３
９と対向するハウジング１０の大径穴１７内面に円周上
等間隔に配置した切欠き２１とにより構成したものであ
る。なお、切欠き２１は等間隔に設けなくてもよい。FIG. 5 shows an annular gap δ2 on the outer periphery of the second flange 39 and cutouts 41 arranged at equal intervals on the circumference of the second flange 39. In FIG. The annular gap δ2 around the outer circumference of the second flange 39 and the second flange 3
9 and notches 21 arranged on the inner surface of the large-diameter hole 17 of the housing 10 facing each other at equal intervals on the circumference. Note that the notches 21 need not be provided at equal intervals.
【００５４】これらの構成によれば、切欠き４１，２１
が軸方向の短いオリフィスであるため、油温による動粘
度変化の影響を低減できる。According to these constructions, the notches 41, 21
Is a short orifice in the axial direction, so that the effect of the kinematic viscosity change due to the oil temperature can be reduced.
【００５５】また、第１ツバ部３８外周の環状隙間δ１
により、溝部４０は二次圧室２８から画成されているた
め、リリーフ噴流により円周方向に二次圧室２８内で圧
力値に偏りがある（ポペット弁体の表面に圧力分布があ
る）場合、第２ツバ部３９外周もしくは第２ツバ部３９
と対向する大径穴１７内面に設ける切欠き４１，２１の
円周方向位置が変わっても、スプリング室２７の圧力変
動を低減できる。Further, an annular gap δ1 on the outer periphery of the first flange portion 38
As a result, since the groove 40 is defined by the secondary pressure chamber 28, there is a bias in the pressure value in the secondary pressure chamber 28 in the circumferential direction due to the relief jet (there is a pressure distribution on the surface of the poppet valve body). In this case, the outer periphery of the second flange 39 or the second flange 39
Even if the circumferential positions of the notches 41 and 21 provided on the inner surface of the large-diameter hole 17 opposed to the above change, the pressure fluctuation of the spring chamber 27 can be reduced.
【００５６】図７においては、第２ツバ部３９外周の環
状隙間δ２に加えて、溝部４０に設けた直径方向の横穴
４２とこの横穴４２に連通しスプリング室２７に開口す
る縦穴４３とで連通路４４を構成したものである。In FIG. 7, in addition to the annular gap δ2 on the outer periphery of the second flange 39, a diametrical lateral hole 42 provided in the groove 40 and a vertical hole 43 communicating with the lateral hole 42 and opening to the spring chamber 27 are connected. This constitutes a passage 44.
【００５７】この構成によれば、穴加工のみでダンピン
グオフィスのための連通路４４が形成できるため、製作
が容易で製作コストを低減できる。According to this structure, since the communication path 44 for the damping office can be formed only by drilling, the production is easy and the production cost can be reduced.
【００５８】図８ないし図１０は、ポペット弁体３０の
先端側の第２ダンパーの変形例を夫々示す。FIGS. 8 to 10 show modified examples of the second damper on the distal end side of the poppet valve element 30, respectively.
【００５９】図８においては、ハウジング１０の小径穴
１３の開口端部をプラグ１１で閉塞することに代えて、
ハウジング１０の小径穴１３を開口のない盲穴で形成し
たものであり、盲栓等を必要とせず、その分安価に構成
したものである。In FIG. 8, instead of closing the opening end of the small diameter hole 13 of the housing 10 with the plug 11,
The small-diameter hole 13 of the housing 10 is formed as a blind hole without an opening, and does not require a blind plug or the like, and is configured to be inexpensive.
【００６０】図９においては、ダンパ室２６と一次圧室
２５を摺動部３３外周の環状隙間を通して連通するので
なく、ダンパ室２６はダンパオリフィス２２を介して別
の通路等に連通されるものであり、この場合には、入口
ポート１２の上流部や排出ポート１６の下流部等に連通
させることができる。In FIG. 9, the damper chamber 26 and the primary pressure chamber 25 do not communicate with each other through an annular gap around the outer periphery of the sliding portion 33, but the damper chamber 26 communicates with another passage or the like via the damper orifice 22. In this case, it is possible to communicate with the upstream portion of the inlet port 12, the downstream portion of the discharge port 16, and the like.
【００６１】また、図１０に示すものは、小径穴１３の
開口端をそのまま開放するものであり、スプリング室２
７によるダンパの減衰力が充分であれば、小径穴１３の
開口端に盲栓等の閉塞手段を設ける必要がないため、構
造を簡素化でき小型化が可能である。In FIG. 10, the opening end of the small-diameter hole 13 is opened as it is, and the spring chamber 2 is opened.
If the damping force of the damper by 7 is sufficient, there is no need to provide a closing means such as a blind plug at the opening end of the small-diameter hole 13, so that the structure can be simplified and the size can be reduced.
【００６２】図１１ないし図１３は本発明の第３の実施
態様を示すもので、ポペット弁体３０の弁体部３１から
先端側に設けられていた摺動部を具備しない直動リリー
フ弁に本発明を適用したものである。FIG. 11 to FIG. 13 show a third embodiment of the present invention, in which a direct-acting relief valve having no sliding portion provided from the valve body portion 31 of the poppet valve body 30 to the distal end side. This is an application of the present invention.
【００６３】図１１において、ポペット弁体３０はハウ
ジング１０のバルブシート１４に接離可能な円錐状の弁
体部３１とハウジング１０の大径穴１７内に環状隙間δ
１，δ２を持って臨む第１，第２ツバ部３８，３９と、
この第１，第２ツバ部３８，３９間の溝部４０とで構成
されている。そして、溝部４０は直径方向の横穴４２お
よび横穴４２に連通しスプリング室２７に開口する縦穴
４３からなる連通路４４によりスプリング室２７に連通
する構成およびその他の構成は図７に示す例と同様であ
る。In FIG. 11, the poppet valve element 30 has a conical valve element portion 31 which can be brought into contact with and separated from the valve seat 14 of the housing 10 and an annular gap δ in the large-diameter hole 17 of the housing 10.
First and second brim portions 38 and 39 facing with 1, δ2;
A groove 40 is provided between the first and second flanges 38 and 39. The configuration in which the groove 40 communicates with the spring chamber 27 by a communication passage 44 formed of a diametrical lateral hole 42 and a lateral hole 42 and a vertical hole 43 opening to the spring chamber 27, and other configurations are the same as those in the example shown in FIG. is there.
【００６４】図１２においては、ポペット弁体３０はハ
ウジング１０のバルブシート１４に接離可能な球状の弁
体部３１を有する点のみが図１１と異なり、その他の構
成は図１１と同様である。12 differs from FIG. 11 only in that the poppet valve element 30 has a spherical valve element portion 31 that can be brought into contact with and separated from the valve seat 14 of the housing 10. Other configurations are the same as in FIG. .
【００６５】図１３においては、ポペット弁体３０は前
記図５と同様に第２ツバ部３９外周部に切欠き４１を設
けると共にハウジング１０のバルブシート１４に接離可
能なブロック状のシート弁で弁体部３１が構成される点
のみが図１１と異なり、その他の構成は図１１と同様で
ある。In FIG. 13, the poppet valve body 30 is a block-shaped seat valve which is provided with a notch 41 on the outer peripheral portion of the second flange 39 and can be brought into contact with and separated from the valve seat 14 of the housing 10 as in FIG. 11 is different from FIG. 11 only in that the valve body 31 is configured, and the other configuration is the same as FIG. 11.
【００６６】これら図１０ないし図１３に示す態様にお
いては、先端にガイド機能がないため、ポペット弁体３
０のツバ部３８，３９とハウジング１０の大径穴１７内
面との環状隙間δ１，δ２をよりタイトな構成とする必
要があり、ポペット弁体３０にツバ部を一個だけ設ける
場合には、この環状隙間（直径の差）δを、δ≦Ｄ×
（１／７５）となるよう形成すれば、ポペット弁体３０
の振れおよび倒れを、上記した先端の案内機能のある図
１ないし図１０の各例と同じにすることができる。In the embodiments shown in FIGS. 10 to 13, since there is no guide function at the tip, the poppet valve body 3
It is necessary to make the annular gaps δ1 and δ2 between the flanges 38 and 39 of the zero and the inner surface of the large-diameter hole 17 of the housing 10 tighter. If only one flange is provided in the poppet valve body 30, this is required. The annular gap (difference in diameter) δ is expressed as δ ≦ D ×
If it is formed to be (1/75), the poppet valve body 30
Can be made the same as the examples shown in FIGS. 1 to 10 having the above-described tip guide function.
【００６７】なお、図１３に鎖線図示したように、ポペ
ット弁体３０のロッド部３６を延長して、調整プラグ１
５に設けた案内穴２３に摺動自在に嵌合させて案内させ
ることもでき、この案内構造を図１１および図１２に示
す例にも適用すると、本発明によるポペット弁体３０の
ツバ部３５，３８，３９と大径穴１７内面との環状隙間
δ，δ１，δ２によるアライメント機能と相俟って、ポ
ペット弁体３０の振れや倒れを確実に防止できる。As shown by a chain line in FIG. 13, the rod portion 36 of the poppet valve body 30 is extended to adjust the adjustment plug 1
5 can be slidably fitted into the guide hole 23 for guiding. When this guide structure is applied to the examples shown in FIGS. 11 and 12, the flange 35 of the poppet valve body 30 according to the present invention is provided. , 38, 39 and the inner surface of the large-diameter hole 17 together with the alignment function provided by the annular gaps δ, δ1, δ2, it is possible to reliably prevent the poppet valve body 30 from swinging or falling.
【００６８】また、上記案内構造を図１ないし図１０に
示すハウジング１０の小径穴１３とポペット弁体３０の
摺動部３３とにより構成される案内部に代えて用いるこ
ともできる。Further, the above-described guide structure can be used in place of the guide portion constituted by the small diameter hole 13 of the housing 10 and the sliding portion 33 of the poppet valve body 30 shown in FIGS.
【図１】本発明の一実施態様を示す直動型リリーフ弁の
断面図である。FIG. 1 is a sectional view of a direct acting relief valve showing one embodiment of the present invention.
【図２】図１の変形例を示す直動型リリーフ弁の断面図
である。FIG. 2 is a sectional view of a direct acting relief valve showing a modification of FIG.
【図３】図１における他の変形例を示す直動型リリーフ
弁の断面図である。FIG. 3 is a sectional view of a direct acting relief valve showing another modification of FIG.
【図４】本発明の第２の実施態様を示す直動型リリーフ
弁の断面図である。FIG. 4 is a cross-sectional view of a direct acting relief valve showing a second embodiment of the present invention.
【図５】図４の変形例の直動型リリーフ弁を示す断面図
ａ）およびａ）図のＶ−Ｖ断面図ｂ）である。5 is a sectional view a) showing a direct acting relief valve according to a modification of FIG. 4, and a sectional view b) of FIG.
【図６】図４の他の変形例の直動型リリーフ弁を示す断
面図ａ）およびａ）図のVI−VI断面図ｂ）である。6 is a sectional view a) showing a direct acting relief valve according to another modification of FIG. 4, and a sectional view taken along line VI-VI of FIG.
【図７】図４の更に他の変形例の直動型リリーフ弁を示
す断面図ａ）およびａ）図のVII−VII断面図ｂ）であ
る。7 is a sectional view a) showing a direct-acting relief valve according to still another modification of FIG. 4 and a sectional view b) of FIG.
【図８】図４の第２ダンパ部の変形例の直動型リリーフ
弁を示す断面図である。FIG. 8 is a sectional view showing a direct acting relief valve of a modified example of the second damper section of FIG.
【図９】図４の第２ダンパ部の他の変形例の直動型リリ
ーフ弁を示す断面図である。FIG. 9 is a cross-sectional view illustrating a direct-acting relief valve according to another modification of the second damper unit of FIG.
【図１０】図４の第２ダンパ部の更に他の変形例の直動
型リリーフ弁を示す断面図である。FIG. 10 is a cross-sectional view showing a direct acting relief valve of still another modified example of the second damper section of FIG.
【図１１】本発明の第３の実施態様を示す直動型リリー
フ弁の断面図である。FIG. 11 is a sectional view of a direct acting relief valve showing a third embodiment of the present invention.
【図１２】図１１の変形例の直動型リリーフ弁の断面図
である。FIG. 12 is a sectional view of a direct acting relief valve according to a modification of FIG. 11;
【図１３】図１１の他の変形例の直動型リリーフ弁の断
面図である。FIG. 13 is a sectional view of a direct acting relief valve according to another modification of FIG. 11;
１０ ハウジング １２ 入口ポート １３ 小径穴 １４ バルブシート １５ 調整プラグ １６ 排出ポート １７ 大径穴 ２１，４１ 切欠き ２３ 案内穴 ２５ 一次圧室 ２６ ダンパ室 ２７ スプリング室 ２８ 二次圧室 ３０ ポペット弁体 ３１ 弁体部 ３３ 摺動部 ３５ ツバ部 ３６ ロッド部 ３７ スプリング ３８ 第１ツバ部 ３９ 第２ツバ部 ４０ 溝部 ４２ 横穴 ４３ 縦穴 ４４ 連通路 DESCRIPTION OF SYMBOLS 10 Housing 12 Inlet port 13 Small diameter hole 14 Valve seat 15 Adjustment plug 16 Discharge port 17 Large diameter hole 21, 41 Notch 23 Guide hole 25 Primary pressure chamber 26 Damper chamber 27 Spring chamber 28 Secondary pressure chamber 30 Poppet valve body 31 Valve Body part 33 Sliding part 35 Flange part 36 Rod part 37 Spring 38 First brim part 39 Second brim part 40 Groove part 42 Side hole 43 Vertical hole 44 Communication passage
───────────────────────────────────────────────────── フロントページの続き (72)発明者 永田 精一 東京都港区浜松町二丁目４番１号 世界貿 易センタービル カヤバ工業株式会社内 Ｆターム(参考） 3H059 AA06 AA08 BB03 BB37 CA02 CA05 CC02 CD05 CF14 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Seiichi Nagata 2-4-1 Hamamatsucho, Minato-ku, Tokyo World Trade Center Building Kayaba Industry Co., Ltd. F-term (reference) 3H059 AA06 AA08 BB03 BB37 CA02 CA05 CC02 CD05 CF14
Claims (7)
圧の入口ポートに連通させて一次圧室とすると共に大径
穴を比較的低圧の排出ポートに連通させ、両穴の段付部
にバルブシートが形成されたハウジングと、 前記バルブシートに接離可能な弁体部および前記大径穴
内面に微小な環状隙間をもって臨むツバ部を備えたポペ
ット弁体と、 前記ハウジングの大径穴内に配置され、ポペット弁体を
前記バルブシートに着座するよう背後から付勢するスプ
リングと、 前記ポペット弁体のツバ部で画成された大径穴内の前記
スプリングが配置されたスプリング室を前記環状隙間を
介して排出ポート側の二次圧室に連通させて形成したダ
ンパとから構成したことを特徴とする直動型リリーフ
弁。1. A small-diameter hole and a large-diameter hole. The small-diameter hole communicates with a high-pressure inlet port to form a primary pressure chamber, and the large-diameter hole communicates with a relatively low-pressure discharge port. A housing in which a valve seat is formed in an attached portion; a poppet valve body including a valve body portion capable of coming in contact with / separating from the valve seat and a flange portion facing the inner surface of the large-diameter hole with a small annular gap; A spring disposed in the diameter hole and biasing the poppet valve body from behind so as to be seated on the valve seat; and a spring chamber in which the spring is disposed in the large diameter hole defined by the flange of the poppet valve body. A direct-acting relief valve comprising: a damper formed to communicate with the secondary pressure chamber on the discharge port side through the annular gap.
部とスプリング室側の第２ツバ部と両ツバ部間の溝部と
で構成され、第１ツバ部と大径穴内面との環状隙間を第
２ツバ部と大径穴内面との環状隙間と同等かもしくは大
きく設定したことを特徴とする請求項１に記載の直動型
リリーフ弁。2. The collar portion includes a first collar portion on a discharge port side, a second collar portion on a spring chamber side, and a groove portion between the two collar portions. The direct acting relief valve according to claim 1, wherein the annular gap is set to be equal to or larger than the annular gap between the second flange portion and the inner surface of the large diameter hole.
２ツバ部と対向する大径穴内面に円周方向の位置を異な
らせて設けた切欠きと第２ツバ部と大径穴内面の環状隙
間とでスプリング室に連通することを特徴とする請求項
２に記載の直動型リリーフ弁。3. A notch provided in the outer periphery of the second flange portion or the inner surface of the large-diameter hole facing the second flange portion at different circumferential positions, and the inner surface of the second flange portion and the large-diameter hole. The direct-acting relief valve according to claim 2, wherein the valve is communicated with the spring chamber through the annular gap.
路と第２ツバ部と大径穴内面の環状隙間とでスプリング
室に連通することを特徴とする請求項２に記載の直動型
リリーフ弁。4. The linear motion according to claim 2, wherein the groove communicates with the spring chamber through a communication passage provided in the poppet valve body, the second flange, and an annular gap formed on the inner surface of the large-diameter hole. Type relief valve.
前記小径穴に摺動自在に嵌合し且つ小径穴内で一次圧室
を画成する摺動部を具備することを特徴とする請求項１
ないし請求項４のいずれか一つに記載の直動型リリーフ
弁。5. The poppet valve element according to claim 1, further comprising a sliding part which is slidably fitted to the small-diameter hole and defines a primary pressure chamber in the small-diameter hole. Claim 1
A direct acting relief valve according to claim 4.
して摺動部と小径穴との隙間を介して一次圧室に連通す
る第２のダンパを形成することを特徴とする請求項５に
記載の直動型リリーフ弁。6. The sliding portion defines an end of the small-diameter hole and forms a second damper that communicates with a primary pressure chamber through a gap between the sliding portion and the small-diameter hole. The direct acting relief valve according to claim 5, wherein
する背面に大径穴の軸方向に延びるロッド部を備え、こ
のロッド部の端部はハウジングに摺動自在に案内されて
いることを特徴とする請求項１ないし請求項４のいずれ
か一つに記載の直動型リリーフ弁。7. The poppet valve element according to claim 1, further comprising an axially extending rod portion having a large-diameter hole on a back surface facing the spring chamber, wherein an end of the rod portion is slidably guided by the housing. The direct acting relief valve according to any one of claims 1 to 4, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000253621A JP4302302B2 (en) | 2000-08-24 | 2000-08-24 | Direct acting relief valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000253621A JP4302302B2 (en) | 2000-08-24 | 2000-08-24 | Direct acting relief valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002061762A true JP2002061762A (en) | 2002-02-28 |
| JP4302302B2 JP4302302B2 (en) | 2009-07-22 |
Family
ID=18742685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000253621A Expired - Fee Related JP4302302B2 (en) | 2000-08-24 | 2000-08-24 | Direct acting relief valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4302302B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008041265A (en) * | 2006-08-01 | 2008-02-21 | Toyota Motor Corp | Fuel cell system |
| JP2010533821A (en) * | 2007-07-18 | 2010-10-28 | ルーク ラメレン ウント クツプルングスバウ ベタイリグングス コマンディートゲゼルシャフト | Pressure relief valve for hydraulic equipment |
| KR101128756B1 (en) | 2008-12-24 | 2012-03-23 | 가부시키가이샤 도요다 지도숏키 | Scroll type compressor |
| CN102959298A (en) * | 2010-07-06 | 2013-03-06 | 沃尔沃建造设备有限公司 | Valve for controlling pressure |
| JP2016038089A (en) * | 2014-08-12 | 2016-03-22 | 株式会社不二越 | Direct relief valve |
| DE102021101743A1 (en) | 2020-02-28 | 2021-09-02 | Kyb Corporation | RELIEF VALVE |
| KR20210125963A (en) * | 2020-03-20 | 2021-10-19 | (주)서진정공 | Relief valve for vehicle |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7287660B2 (en) | 2019-05-21 | 2023-06-06 | 国立研究開発法人防災科学技術研究所 | SHAKING TABLE CONTROL DEVICE AND SHAKING TABLE CONTROL METHOD |
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| JPS5628363A (en) * | 1979-08-13 | 1981-03-19 | Kayaba Ind Co Ltd | Relief valve |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008041265A (en) * | 2006-08-01 | 2008-02-21 | Toyota Motor Corp | Fuel cell system |
| JP2010533821A (en) * | 2007-07-18 | 2010-10-28 | ルーク ラメレン ウント クツプルングスバウ ベタイリグングス コマンディートゲゼルシャフト | Pressure relief valve for hydraulic equipment |
| KR101128756B1 (en) | 2008-12-24 | 2012-03-23 | 가부시키가이샤 도요다 지도숏키 | Scroll type compressor |
| CN102959298A (en) * | 2010-07-06 | 2013-03-06 | 沃尔沃建造设备有限公司 | Valve for controlling pressure |
| JP2016038089A (en) * | 2014-08-12 | 2016-03-22 | 株式会社不二越 | Direct relief valve |
| DE102021101743A1 (en) | 2020-02-28 | 2021-09-02 | Kyb Corporation | RELIEF VALVE |
| KR20210125963A (en) * | 2020-03-20 | 2021-10-19 | (주)서진정공 | Relief valve for vehicle |
| KR102358811B1 (en) | 2020-03-20 | 2022-02-08 | (주)서진정공 | Relief valve for vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4302302B2 (en) | 2009-07-22 |
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