JPS63318374A - Pressure control valve - Google Patents
Pressure control valveInfo
- Publication number
- JPS63318374A JPS63318374A JP15427987A JP15427987A JPS63318374A JP S63318374 A JPS63318374 A JP S63318374A JP 15427987 A JP15427987 A JP 15427987A JP 15427987 A JP15427987 A JP 15427987A JP S63318374 A JPS63318374 A JP S63318374A
- Authority
- JP
- Japan
- Prior art keywords
- pressure chamber
- pilot
- high pressure
- pressure
- main spool
- 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
- 230000000903 blocking effect Effects 0.000 claims description 2
- 230000010349 pulsation Effects 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
Landscapes
- Measuring Fluid Pressure (AREA)
- Safety Valves (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、油圧回路における異常圧による油圧機器や油
圧装置の破壊を防止する圧力制御弁に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pressure control valve that prevents damage to hydraulic equipment or hydraulic equipment due to abnormal pressure in a hydraulic circuit.
第7図に示すように、弁本体1に高圧側2と低圧側3と
を断通する主ポペット4及びパイロットポペット5を設
け、高圧側2の圧油でパイロットポペット5がバネ6に
抗して開放すると主ポペット4のオリフィス7を通して
高圧側2から低圧側3へ油が流れ、主ポペット4の前後
に差圧が生じて主ポット4がバネ8に抗して開放して高
圧側2と低圧側3とを連通して高圧油を低圧側に流出す
る圧力制御弁が知られている。As shown in FIG. 7, a main poppet 4 and a pilot poppet 5 are provided in the valve body 1 to disconnect the high pressure side 2 and the low pressure side 3, and the pilot poppet 5 resists the spring 6 by the pressure oil on the high pressure side 2. When the main poppet 4 is opened, oil flows from the high pressure side 2 to the low pressure side 3 through the orifice 7 of the main poppet 4, and a pressure difference is generated before and after the main poppet 4, and the main pot 4 opens against the spring 8, and the oil flows from the high pressure side 2 to the low pressure side 3. A pressure control valve is known that communicates with the low pressure side 3 and allows high pressure oil to flow out to the low pressure side.
かかる圧力制御弁であると、パイロットポペット5は軸
部5aが高圧側2に臨み、その圧油でバネ6に抗して移
動してシート部5bをシート座9より離して主ポペット
4のバネ室4aを油孔10で低圧側3に連通ずる構造で
あり、パイロットポペット5自体の構造が複雑となって
圧力制御弁全体が複雑な構造となる。In such a pressure control valve, the shaft portion 5a of the pilot poppet 5 faces the high-pressure side 2, and the pilot poppet 5 moves against the spring 6 using its pressure oil to separate the seat portion 5b from the seat seat 9 and release the spring of the main poppet 4. The structure is such that the chamber 4a is communicated with the low pressure side 3 through the oil hole 10, and the structure of the pilot poppet 5 itself becomes complicated, resulting in a complicated structure of the entire pressure control valve.
また、主ポペット4は肩部4aに高圧油が作用し、その
高圧油の作用する面積が主ポペット4の断面積に比較し
て小さくなり、ヒステリシスが大きくなる。Further, high pressure oil acts on the shoulder portion 4a of the main poppet 4, and the area on which the high pressure oil acts becomes smaller than the cross-sectional area of the main poppet 4, increasing hysteresis.
また、主ポペット4はコーンシート形式のため通路面積
変化が大きく油圧脈動が大きく、作動時の安定性が悪い
。Further, since the main poppet 4 is of a cone sheet type, the passage area changes greatly, the hydraulic pulsation is large, and the stability during operation is poor.
また、パイロットポペット5の軸部5aが高圧側2に臨
む構造であるから構造上一体化が難しく大きくなる。Further, since the shaft portion 5a of the pilot poppet 5 faces the high-pressure side 2, it is difficult to integrate the structure and the size increases.
そこで、本発明は前述の問題点を解決することができる
実用的である圧力制御弁を提供することを目的とする。Therefore, an object of the present invention is to provide a practical pressure control valve that can solve the above-mentioned problems.
〔問題点を解決するための手段及び作用〕高圧室と低圧
室とを断通する主スプールをバネで遮断位置に保持し、
かつ端面に開口するパイロット圧力室内のパイロット圧
で連通位置に移動するようにし、高圧室内の高圧油で作
動して高圧室とパイロット圧力室とを連通ずるパイロッ
トポペットを設けると共に、パイロット圧力室をオリフ
ィスを通して低圧室に連通して、構造簡単で主スプール
の推力を大きくできるようにしたものである。[Means and actions for solving the problem] The main spool that connects the high pressure chamber and the low pressure chamber is held in the blocking position by a spring,
The pilot pressure chamber is moved to a communicating position by the pilot pressure in the pilot pressure chamber opened at the end face, and a pilot poppet is provided which is actuated by high pressure oil in the high pressure chamber to communicate the high pressure chamber and the pilot pressure chamber, and the pilot pressure chamber is connected to an orifice. It communicates with the low pressure chamber through the spool, which has a simple structure and can increase the thrust of the main spool.
第1図に示すように、弁本体20には高圧室21と低圧
室22とを断通ずる主スプール23が嵌挿され、該主ス
プール23は高圧室21と低圧室22とを断通する第1
大径部24及びパイロット圧力室25に臨む第2大径部
26並びに第1、第2大径部24.26を連結する小径
部27より成り、パイロット圧力室25は油孔28、オ
リフィス29を通して低圧室22に連通していると共に
、主スプール23はバネ30で右方に押されて高圧室2
1と低圧室22を第1大径部24で遮断する位置に保持
され、前期油孔28と高圧室21は孔31で連通し、か
つパイロットポペット32をバネ33で孔31の周縁、
つまりシート座34に圧着して遮断していると共に、パ
イロットポペット32には直径dの孔31より高圧室2
1内の圧油が作用し、第2大径部26は直径D (Da
d)となっている。As shown in FIG. 1, a main spool 23 that disconnects the high pressure chamber 21 and the low pressure chamber 22 is fitted into the valve body 20. 1
It consists of a second large diameter part 26 facing the large diameter part 24 and a pilot pressure chamber 25, and a small diameter part 27 connecting the first and second large diameter parts 24 and 26. In addition to communicating with the low pressure chamber 22, the main spool 23 is pushed to the right by a spring 30 and is connected to the high pressure chamber 2.
1 and the low pressure chamber 22 are held in a position where the first large diameter portion 24 blocks them, the first oil hole 28 and the high pressure chamber 21 communicate with each other through the hole 31, and the pilot poppet 32 is connected to the periphery of the hole 31 by a spring 33.
In other words, it is crimped to the seat seat 34 to shut it off, and the pilot poppet 32 has a hole 31 with a diameter d connected to the high pressure chamber 2.
1 acts, the second large diameter portion 26 has a diameter D (Da
d).
しかして、高圧室21内の圧力P、がパイロットポペッ
ト32の受圧面積とバネ33のバネ力とによって定まる
設定圧20以上となると、パイロットポペット32が押
し下げられて第2図に示すように高圧室21内の圧力P
、が油孔28よりパイロット圧力室25に流入し、これ
と同時に油孔28に流入した圧油はオリフィス29を通
って低圧室22に流れてタンク35にドレーンするが、
オリフィス29を通る際に圧力P2が発生し、この圧力
P2が第2大径部2Bの右端面26aに作用して主スプ
ール23をバネ30に抗して左方に押動し、高圧室21
内の高圧油は第1大径部24の切欠溝36より低圧室2
2に流れるので、高圧室21内の圧力P1が前記設定圧
Poまで低下する。When the pressure P in the high pressure chamber 21 exceeds the set pressure 20 determined by the pressure receiving area of the pilot poppet 32 and the spring force of the spring 33, the pilot poppet 32 is pushed down and the high pressure chamber opens as shown in FIG. Pressure P inside 21
, flows into the pilot pressure chamber 25 from the oil hole 28, and at the same time, the pressure oil that flows into the oil hole 28 flows through the orifice 29 to the low pressure chamber 22 and drains into the tank 35.
Pressure P2 is generated when passing through the orifice 29, and this pressure P2 acts on the right end surface 26a of the second large diameter portion 2B to push the main spool 23 to the left against the spring 30, and the high pressure chamber 21
The high-pressure oil inside is transferred from the notch groove 36 of the first large-diameter portion 24 to the low-pressure chamber 2.
2, the pressure P1 in the high pressure chamber 21 decreases to the set pressure Po.
高圧室21内の圧力P、が設定圧P0以下に低下すると
、パイロットポペット32はバネ33でシート座34に
圧着して油孔28に高圧室21内の圧油が流入しなくな
るので、前述の圧力P2が発生しなくなって主スプール
23はバネ30で第1図の状態に右方に移動する。When the pressure P in the high pressure chamber 21 drops below the set pressure P0, the pilot poppet 32 is pressed against the seat seat 34 by the spring 33, and the pressure oil in the high pressure chamber 21 no longer flows into the oil hole 28. When the pressure P2 is no longer generated, the main spool 23 is moved to the right by the spring 30 to the state shown in FIG.
これにより、高圧室21内の圧力P、をパイロットポペ
ット32の受圧面積とバネ33のバネ力とで決定される
設定圧PGに維持できる。Thereby, the pressure P in the high pressure chamber 21 can be maintained at the set pressure PG determined by the pressure receiving area of the pilot poppet 32 and the spring force of the spring 33.
以上の実施例によれば次の効果を有する。The above embodiment has the following effects.
■、パイロットポペット32は高圧室21内の高圧を受
けてその高圧油を逃がすので構造が簡単となる。(2) The pilot poppet 32 receives the high pressure in the high pressure chamber 21 and releases the high pressure oil, so the structure is simple.
2、主スプール23は第2大径部26の右端面26aに
パイロット圧を受けるので、受圧面積が大きくなって推
力が大きくなるため主スプール作動時の摺動抵抗の影響
が少なくなる。したがって、圧力オーバライド特性のヒ
ステリシスを小さくできる。2. Since the main spool 23 receives pilot pressure on the right end surface 26a of the second large diameter portion 26, the pressure receiving area becomes large and the thrust becomes large, so that the influence of sliding resistance when the main spool is operated is reduced. Therefore, the hysteresis of the pressure override characteristic can be reduced.
3、主スプール24の切欠溝36より高圧油がリリーフ
するので、リリーフ時の通路面積変化が小さく、油圧脈
動が小さくなると共に、切欠溝36の形状により通路面
積変化を任意に設定できて油圧脈動を任意により小さく
できる。3. High-pressure oil is relieved from the notched groove 36 of the main spool 24, so the passage area change during relief is small, reducing hydraulic pulsation, and the shape of the notched groove 36 allows the passage area change to be set arbitrarily, reducing hydraulic pulsation. can be arbitrarily made smaller.
4、高圧油の低圧室22へのパイロットリリーフの途中
、つまり油孔28にオリフィス29が設けられているた
め、パイロット圧力室25内の面圧脈動が発生し難くな
ると共に、オリフィス29の径を変えることで圧力オー
バーライド特性を変えることができる。例えばオリフス
29の径を大きくすれば圧力オーバーライド特性は小さ
く、小さくすれば大きくなる。4. Since the orifice 29 is provided in the middle of the pilot relief of high-pressure oil to the low-pressure chamber 22, that is, in the oil hole 28, surface pressure pulsations in the pilot pressure chamber 25 are less likely to occur, and the diameter of the orifice 29 can be reduced. By changing the pressure override characteristics, you can change the pressure override characteristics. For example, if the diameter of the orifice 29 is increased, the pressure override characteristic will be decreased, and if the diameter of the orifice 29 is decreased, the pressure override characteristic will be increased.
5、構造簡単でカートリッジ化が容易となると共に、安
価となる。5. The structure is simple, making it easy to make into a cartridge, and it is also inexpensive.
第3図は第2実施例を示し、パイロットポペット32の
バネ受37を摺動自在として受圧室38を形成し、この
受圧室38に外部より圧力流体を供給してバネ受37を
摺動させることでバネ33のセット荷重を調整できるよ
うにしてあり、これにより高圧室21内の圧力を可変と
することができる。FIG. 3 shows a second embodiment, in which a spring receiver 37 of a pilot poppet 32 is made slidable to form a pressure receiving chamber 38, and pressure fluid is supplied to this pressure receiving chamber 38 from the outside to cause the spring receiver 37 to slide. This allows the set load of the spring 33 to be adjusted, thereby making it possible to vary the pressure within the high pressure chamber 21.
なお、この場合パイロットポペット32は孔32aを有
する摺動タイプとなり、孔32aで高圧室21と油孔2
8とを断通ずるようにしである。In this case, the pilot poppet 32 is a sliding type having a hole 32a, and the hole 32a connects the high pressure chamber 21 and the oil hole 2.
8.
第4図は第3実施例を示し、弁本体2oにスリーブ40
を嵌挿し、このスリーブ4o内に主スプール23を嵌合
すると共に、バネ3oで主スプール23を右方に付勢し
てコーンシート41をスリーブ40のシート座40aに
圧着することで高圧室21と低圧室22を遮断している
。FIG. 4 shows a third embodiment, in which a sleeve 40 is attached to the valve body 2o.
The main spool 23 is fitted into the sleeve 4o, and the main spool 23 is biased to the right by the spring 3o to press the cone sheet 41 onto the seat seat 40a of the sleeve 40, thereby forming the high pressure chamber 21. and the low pressure chamber 22 is shut off.
そして、スリーブ40の右端にキャップ42を螺合して
パイロット圧力室25を形成すると共に、主スプール2
3に高圧室21とパイロット圧力室25を断通するパイ
ロットポペット32を設け、パイロット圧力室25をオ
リフィス29を通してタンク35に連通しである。A cap 42 is screwed onto the right end of the sleeve 40 to form a pilot pressure chamber 25 and a main spool 25.
3 is provided with a pilot poppet 32 that disconnects the high pressure chamber 21 and the pilot pressure chamber 25, and the pilot pressure chamber 25 is communicated with the tank 35 through the orifice 29.
このようであれば高圧室21内の圧力によってパイロッ
トポペット32が開いてオリフィス29を通って高圧油
がタンク35に流出し、パイロット圧力室25に圧力が
発生して主スプール23をバネ30に抗して左方に押動
し、コーンシート41がシート座40aより離れて切欠
溝36より高圧室21内の高圧油が低圧室22に流出し
て高圧室21内の圧力を設定圧に維持できる。If this is the case, the pilot poppet 32 will open due to the pressure in the high pressure chamber 21, and high pressure oil will flow out into the tank 35 through the orifice 29. Pressure will be generated in the pilot pressure chamber 25, causing the main spool 23 to resist the spring 30. The cone seat 41 is moved away from the seat seat 40a and the high pressure oil in the high pressure chamber 21 flows out into the low pressure chamber 22 through the notched groove 36, allowing the pressure in the high pressure chamber 21 to be maintained at the set pressure. .
また、ポペット32は主スプール23内の通路23aで
高圧室21に臨む構造であるから、一体化が容易で小型
化できる。Furthermore, since the poppet 32 is structured so as to face the high pressure chamber 21 through the passage 23a within the main spool 23, it can be easily integrated and miniaturized.
第5図は第4実施例を示し、主スプール23に高圧導入
孔43とパイロット孔44とを断通ずるパイロットポペ
ット32を設け、このパイロットポペット32が開放す
ると高圧室21内 4の高圧油がオリフィス29を通っ
て低圧室22に流れて圧力が生じ、その圧力がパイロッ
ト孔44を通して主スプール23のパイロット圧力室2
5に流入してバネ30に抗して右方に押動し、コーンシ
ート45がシート座46より離れると共に、切欠溝36
で高圧室21と低圧室22が連通ずるようにしである。FIG. 5 shows a fourth embodiment, in which the main spool 23 is provided with a pilot poppet 32 that disconnects the high pressure introduction hole 43 and the pilot hole 44, and when the pilot poppet 32 is opened, the high pressure oil in the high pressure chamber 21 flows into the orifice. 29 to the low pressure chamber 22 to generate pressure, and the pressure flows through the pilot hole 44 to the pilot pressure chamber 2 of the main spool 23.
5 and is pushed to the right against the spring 30, and as the cone seat 45 separates from the seat seat 46, the notch groove 36
The high pressure chamber 21 and the low pressure chamber 22 are communicated with each other.
また、第6図に示すように主スプール23にオリフィス
2つを有する孔47を形成し、この孔47を通して高圧
油が低圧室22に流れるようにしても良い。Further, as shown in FIG. 6, a hole 47 having two orifices may be formed in the main spool 23, and high pressure oil may flow into the low pressure chamber 22 through this hole 47.
〔発明の効果〕
パイロットポペット32は高圧室21内の高圧油を受け
て高圧油をパイロット圧力室25に供給すべく作動する
ので、構造が簡単となる。[Effects of the Invention] Since the pilot poppet 32 operates to receive high pressure oil in the high pressure chamber 21 and supply the high pressure oil to the pilot pressure chamber 25, the structure is simplified.
主スプール23の端面にパイロット圧力が作用するので
、その受圧面積が大きくなって推力が大となるからヒス
テリスが小さくなる。Since the pilot pressure acts on the end face of the main spool 23, the pressure-receiving area becomes larger, the thrust becomes larger, and the hysteresis becomes smaller.
第1図は本発明の第1実施例の断面図、第2図は動作説
明図、第3図、第4図、第5図、第6図は第2、第3、
第4、第5実施例の断面図、第7図は従来例の断面図で
ある。
21は高圧室、22は低圧室、23は主スプール、25
はパイロット圧力室、29はオリフィス、30はバネ、
32はパイロットポペット。FIG. 1 is a sectional view of the first embodiment of the present invention, FIG. 2 is an explanatory diagram of operation, and FIGS. 3, 4, 5, and 6 are sectional views of the second, third, and
4th and 5th embodiments, and FIG. 7 is a sectional view of the conventional example. 21 is a high pressure chamber, 22 is a low pressure chamber, 23 is a main spool, 25
is a pilot pressure chamber, 29 is an orifice, 30 is a spring,
32 is the pilot poppet.
Claims (1)
と、この主スプール23を遮断位置に保持するバネ30
と、このバネ力に抗して主スプール23を連通位置に押
し動する主スプール23の端面に開口するパイロット圧
力室25と、このパイロット圧力室25と高圧室22と
を高圧室22内の高圧油で断通するパイロットポペット
32と、パイロット圧力室25を低圧室22に連通する
オリフィス29とより構成したことを特徴とする圧力制
御弁。Main spool 23 that disconnects high pressure chamber 21 and low pressure chamber 22
and a spring 30 that holds this main spool 23 in the blocking position.
A pilot pressure chamber 25 opens at the end face of the main spool 23 that pushes the main spool 23 to the communicating position against this spring force, and connects the pilot pressure chamber 25 and the high pressure chamber 22 to the high pressure inside the high pressure chamber 22. A pressure control valve comprising a pilot poppet 32 that is interrupted by oil and an orifice 29 that communicates a pilot pressure chamber 25 with a low pressure chamber 22.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62154279A JP2649045B2 (en) | 1987-06-23 | 1987-06-23 | Pressure control valve |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62154279A JP2649045B2 (en) | 1987-06-23 | 1987-06-23 | Pressure control valve |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS63318374A true JPS63318374A (en) | 1988-12-27 |
JP2649045B2 JP2649045B2 (en) | 1997-09-03 |
Family
ID=15580683
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62154279A Expired - Lifetime JP2649045B2 (en) | 1987-06-23 | 1987-06-23 | Pressure control valve |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2649045B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5372060A (en) * | 1992-12-22 | 1994-12-13 | Kabushiki Kaisha Komatsu Seisakusho | Hydraulic valve assembly |
EP3690259A1 (en) * | 2019-01-31 | 2020-08-05 | CLAAS Industrietechnik GmbH | Shut-off valve for a hydraulically driven attachment and attachment for an agricultural working machine |
CN114391074A (en) * | 2019-12-25 | 2022-04-22 | 株式会社爱信 | Linear solenoid valve |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56108064U (en) * | 1980-01-22 | 1981-08-21 | ||
JPS6016212U (en) * | 1983-07-04 | 1985-02-04 | 株式会社トキメック | pressure control valve |
-
1987
- 1987-06-23 JP JP62154279A patent/JP2649045B2/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56108064U (en) * | 1980-01-22 | 1981-08-21 | ||
JPS6016212U (en) * | 1983-07-04 | 1985-02-04 | 株式会社トキメック | pressure control valve |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5372060A (en) * | 1992-12-22 | 1994-12-13 | Kabushiki Kaisha Komatsu Seisakusho | Hydraulic valve assembly |
EP3690259A1 (en) * | 2019-01-31 | 2020-08-05 | CLAAS Industrietechnik GmbH | Shut-off valve for a hydraulically driven attachment and attachment for an agricultural working machine |
CN114391074A (en) * | 2019-12-25 | 2022-04-22 | 株式会社爱信 | Linear solenoid valve |
Also Published As
Publication number | Publication date |
---|---|
JP2649045B2 (en) | 1997-09-03 |
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