JP5756229B2 - 油圧回路 - Google Patents
油圧回路 Download PDFInfo
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- JP5756229B2 JP5756229B2 JP2014508953A JP2014508953A JP5756229B2 JP 5756229 B2 JP5756229 B2 JP 5756229B2 JP 2014508953 A JP2014508953 A JP 2014508953A JP 2014508953 A JP2014508953 A JP 2014508953A JP 5756229 B2 JP5756229 B2 JP 5756229B2
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- 230000007423 decrease Effects 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 description 9
- 230000004044 response Effects 0.000 description 8
- 230000004043 responsiveness Effects 0.000 description 4
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
- F15B11/042—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in"
- F15B11/0423—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in" by controlling pump output or bypass, other than to maintain constant speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/024—Pressure relief valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/06—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with special arrangements for adjusting the opening pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
- F16K17/28—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only
- F16K17/30—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only spring-loaded
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
- F15B2211/20553—Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3105—Neutral or centre positions
- F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed centre
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
- F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/52—Pressure control characterised by the type of actuation
- F15B2211/528—Pressure control characterised by the type of actuation actuated by fluid pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
- F15B2211/6346—Electronic controllers using input signals representing a state of input means, e.g. joystick position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/665—Methods of control using electronic components
- F15B2211/6652—Control of the pressure source, e.g. control of the swash plate angle
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fluid-Pressure Circuits (AREA)
Description
第1の弁部及び第2の弁部をこのように構成することにより、電磁比例減圧弁の制御圧力に応じて第1の弁部の設定圧力が変更されるとともに、第1の弁部の開弁による絞り圧の低下に応じて第2の弁部が開弁されるようになり、リリーフ弁装置の減圧作動信頼性及び減圧作動応答性が改善される。
リリーフ弁装置にこのような圧力特性を持たせることにより、電磁比例減圧弁の制御圧力が低いときは油圧ポンプの設定圧力とリリーフ弁装置の設定圧力との差圧を大きく、電磁比例減圧弁の制御圧力が高いときは油圧ポンプの設定圧力とリリーフ弁装置の設定圧力との差圧を小さくすることができる。そのため、主回路圧力が低いときには減圧動作を生じにくくする一方、主回路圧力が高いときには減圧動作を生じやすくすることができる。このとき、主回路圧力が低いときにはサージ圧が高くなりやすいが、主回路圧力自体が低いために、油圧機器等の破損を引き起こすおそれはない。
リリーフ弁装置をこのように構成することにより、受圧面積の差に応じて、電磁比例減圧弁の制御圧力が高くなるにしたがい油圧ポンプの設定圧力とリリーフ弁装置の設定圧力との差圧が小さくなる特性を容易に実現することができるとともに、パイロットスプリングのバネ力に応じて、差圧の大きさを所望の大きさに設定することができる。
本発明の実施の形態にかかる油圧回路の一構成例について、図面を参照しながら説明する。
図1は、油圧ショベル等に適用され、複数の油圧アクチュエータ1a,1bの作動を制御する油圧回路の一例を示している。この油圧回路はエンジン等の駆動装置Eに接続された二台の可変容量式の油圧ポンプ2a,2bと、一台の固定容量式の油圧ポンプ18とを備えている。可変容量式の油圧ポンプ2a,2bは斜板等のポンプ容量制御機構を備えたアキシャルピストンポンプ等の公知のものである。各アクチュエータ1a,1bは、油圧ポンプ2a,2bの吐出圧力が導入される主回路3a,3bにクローズドセンター型方向制御弁4a,4bを介して接続されている。
次に、本実施の形態にかかる油圧回路に設けられるリリーフ弁装置20の具体的な一構成例について、図2(a)〜(b)に基づいて説明する。
図2(a)は、パイロットスプール22の軸方向に沿って切断したリリーフ弁装置20の断面図を示し、図2(b)は、パイロットスプール22の軸方向に直交する方向に沿って切断したリリーフ弁装置20の断面図を示している。
Fa=Ps×A1 …(式1)
Fb=Pc×A2+Fsp …(式2)
以上説明した本実施の形態にかかる油圧回路によれば、パイロット式の可変リリーフ弁構造を有する第1の弁部21とは別に第2の弁部31を設け、第1の弁部21が開弁することに応答して第2の弁部31も開弁するように構成しているために、油圧ポンプ2a,2bの設定圧力とリリーフ弁装置20の設定圧力との差圧ΔPを所望の大きさに設定して減圧作動信頼性を確保できるとともに、減圧速度が高められて減圧作動応答性を改善することができる。
Claims (4)
- 油圧ポンプを備えた油圧回路であって、前記油圧ポンプの設定圧力を設定するための操作手段と、前記油圧ポンプの吐出流量を調節するための流量調節手段と、前記油圧ポンプの吐出圧力を前記設定圧力とするために前記流量調節手段に制御圧力を供給する制御手段と、主回路圧力が所定の圧力を超える場合に前記主回路圧力を減圧するためのリリーフ弁装置と、クローズドセンター型方向制御弁を介して主回路に接続されたアクチュエータと、を備えた油圧回路において、
前記リリーフ弁装置が、
パイロットスプール及びパイロットスプリングを有し、絞り油路を介して主回路から供給される絞り圧と、前記制御圧力及び前記パイロットスプリングの付勢力と、のバランスによって前記パイロットスプールの位置が決定されて、前記絞り油路を介して前記主回路圧力を外部に逃がす第1の弁部と、
バルブピストン及びバルブスプリングを有し、前記主回路圧力と、前記絞り圧及び前記バルブスプリングの付勢力と、のバランスによって前記バルブピストンの位置が決定されて、前記主回路圧力を外部に逃がす第2の弁部と、
を備えることを特徴とする油圧回路。 - 前記第1の弁部の前記パイロットスプールが、前記絞り圧を一方側への押力として受けるとともに、前記制御圧力及び前記パイロットスプリングの付勢力を他方側への押力として受けるものとして構成され、
前記第2の弁部の前記バルブピストンが、前記主回路圧力を一方側への押力として受けるとともに、前記絞り圧及び前記バルブスプリングの付勢力を他方側への押力として受けるものとして構成されることを特徴とする請求項1に記載の油圧回路。 - 前記リリーフ弁装置の圧力特性は、前記制御圧力が高くなるにしたがい、前記油圧ポンプの設定圧力と前記リリーフ弁装置の設定圧力との差圧が小さくなることを特徴とする請求項1又は2に記載の油圧回路。
- 前記第1の弁部の前記パイロットスプールにおける前記絞り圧の受圧面積を、前記制御圧力の受圧面積よりも小さくし、かつ、前記第1の弁部の前記パイロットスプリングのバネ力を調整することにより、前記油圧ポンプの設定圧力と前記リリーフ弁装置の設定圧力との差圧を調整可能とすることを特徴とする請求項1〜3のいずれか一項に記載の油圧回路。
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2012/059105 WO2013150613A1 (ja) | 2012-04-03 | 2012-04-03 | 油圧回路 |
Publications (2)
Publication Number | Publication Date |
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JP5756229B2 true JP5756229B2 (ja) | 2015-07-29 |
JPWO2013150613A1 JPWO2013150613A1 (ja) | 2015-12-14 |
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Family Applications (1)
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JP2014508953A Active JP5756229B2 (ja) | 2012-04-03 | 2012-04-03 | 油圧回路 |
Country Status (6)
Country | Link |
---|---|
US (1) | US9657754B2 (ja) |
EP (1) | EP2700825B1 (ja) |
JP (1) | JP5756229B2 (ja) |
KR (1) | KR101537930B1 (ja) |
CN (1) | CN103547811B (ja) |
WO (1) | WO2013150613A1 (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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MX2018001645A (es) | 2015-08-10 | 2019-06-20 | Eaton Intelligent Power Ltd | Control de presion proporcional electrohidraulico para bomba de circuito abierto. |
DE102016001357A1 (de) * | 2016-02-06 | 2017-08-10 | Borgwarner Inc. | Hydraulikkomponente, Kombination aus Hydraulikkomponenten und hydraulisches System mit mindestens einer solchen Hydraulikkomponente oder Kombination |
EP3748159A4 (en) * | 2018-01-30 | 2021-11-03 | Valeo Japan Co., Ltd. | COMPRESSORS WITH VARIABLE CAPACITY |
DE102018210694A1 (de) * | 2018-06-29 | 2020-01-02 | Robert Bosch Gmbh | Hydrostatische Axialkolbenpumpe für einen hydrostatischen Fahrantrieb |
IT201800009591A1 (it) * | 2018-10-18 | 2020-04-18 | Walvoil Spa | Sistema idraulico di tipo load sensing con dispositivo idraulico di regolazione |
US11891928B2 (en) | 2019-06-19 | 2024-02-06 | The Oilgear Company | Hydraulic valve with linear adjustable throttling gate and a hydraulic velocity fuse throttling gate |
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DE3118576A1 (de) * | 1981-05-11 | 1982-12-02 | Mannesmann Rexroth GmbH, 8770 Lohr | Regeleinrichtung fuer eine verstellpumpe |
JPH0672437B2 (ja) * | 1986-11-27 | 1994-09-14 | 油谷重工株式会社 | 油圧シヨベルの油圧回路 |
JPH04143471A (ja) | 1990-10-04 | 1992-05-18 | Kawasaki Heavy Ind Ltd | 可変容量形ポンプの制御装置 |
JP3419812B2 (ja) * | 1993-03-01 | 2003-06-23 | 東芝機械株式会社 | 差動型直動リリーフ弁 |
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JP3471638B2 (ja) | 1998-12-01 | 2003-12-02 | 内田油圧機器工業株式会社 | 可変容量ポンプを使用したブリードオフ制御方法 |
JP4252178B2 (ja) | 1998-12-04 | 2009-04-08 | 東芝機械株式会社 | リリーフ弁 |
JP2004019873A (ja) * | 2002-06-19 | 2004-01-22 | Toyota Industries Corp | 油圧制御装置および該油圧制御装置を備えた産業車両 |
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CN101774042B (zh) * | 2010-01-14 | 2012-07-18 | 东北大学 | 一种斜刃剪切机液压传动回路 |
CN201972595U (zh) * | 2010-10-20 | 2011-09-14 | 同济大学 | 旋挖钻机能量回收液压装置 |
JP5336558B2 (ja) * | 2011-08-19 | 2013-11-06 | ボッシュ・レックスロス株式会社 | 可変容量ポンプの制御方法 |
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2012
- 2012-04-03 WO PCT/JP2012/059105 patent/WO2013150613A1/ja active Application Filing
- 2012-04-03 KR KR1020137029804A patent/KR101537930B1/ko active IP Right Grant
- 2012-04-03 CN CN201280007156.1A patent/CN103547811B/zh active Active
- 2012-04-03 EP EP12873485.2A patent/EP2700825B1/en active Active
- 2012-04-03 US US14/005,552 patent/US9657754B2/en active Active
- 2012-04-03 JP JP2014508953A patent/JP5756229B2/ja active Active
Also Published As
Publication number | Publication date |
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KR101537930B1 (ko) | 2015-07-20 |
WO2013150613A1 (ja) | 2013-10-10 |
EP2700825A1 (en) | 2014-02-26 |
US20150020516A1 (en) | 2015-01-22 |
JPWO2013150613A1 (ja) | 2015-12-14 |
EP2700825A4 (en) | 2015-09-16 |
KR20140009479A (ko) | 2014-01-22 |
US9657754B2 (en) | 2017-05-23 |
CN103547811B (zh) | 2016-08-17 |
EP2700825B1 (en) | 2019-06-19 |
CN103547811A (zh) | 2014-01-29 |
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