JP4081487B2 - 油圧制御弁 - Google Patents
油圧制御弁 Download PDFInfo
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- JP4081487B2 JP4081487B2 JP2005351979A JP2005351979A JP4081487B2 JP 4081487 B2 JP4081487 B2 JP 4081487B2 JP 2005351979 A JP2005351979 A JP 2005351979A JP 2005351979 A JP2005351979 A JP 2005351979A JP 4081487 B2 JP4081487 B2 JP 4081487B2
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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
- F15B11/05—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed specially adapted to maintain constant speed, e.g. pressure-compensated, load-responsive
- F15B11/055—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed specially adapted to maintain constant speed, e.g. pressure-compensated, load-responsive by adjusting the pump output or bypass
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
- E02F9/2207—Arrangements for controlling the attitude of actuators, e.g. speed, floating function for reducing or compensating oscillations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating 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
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
- F15B11/166—Controlling a pilot pressure in response to the load, i.e. supply to at least one user is regulated by adjusting either the system pilot pressure or one or more of the individual pilot command pressures
-
- 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
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/20—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members
-
- 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
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/38—Control of exclusively fluid gearing
- F16H61/40—Control of exclusively fluid gearing hydrostatic
-
- 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
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/38—Control of exclusively fluid gearing
- F16H61/40—Control of exclusively fluid gearing hydrostatic
- F16H61/4008—Control of circuit pressure
- F16H61/4017—Control of high pressure, e.g. avoiding excess pressure by a relief valve
-
- 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
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/38—Control of exclusively fluid gearing
- F16H61/40—Control of exclusively fluid gearing hydrostatic
- F16H61/4061—Control related to directional control valves, e.g. change-over valves, for crossing the feeding conduits
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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
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/38—Control of exclusively fluid gearing
- F16H61/40—Control of exclusively fluid gearing hydrostatic
- F16H61/4148—Open loop circuits
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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
- F15B2211/20—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
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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
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/25—Pressure control functions
- F15B2211/251—High pressure control
-
- 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
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
- F15B2211/3053—In combination with a pressure compensating valve
- F15B2211/30535—In combination with a pressure compensating valve the pressure compensating valve is arranged between pressure source and directional control 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
- F15B2211/30—Directional control
- F15B2211/32—Directional control characterised by the type of actuation
- F15B2211/329—Directional 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
- F15B2211/60—Circuit components or control therefor
- F15B2211/605—Load sensing circuits
- F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
- F15B2211/6052—Load sensing circuits having valve means between output member and the load sensing circuit using check valves
-
- 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
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7051—Linear output members
- F15B2211/7053—Double-acting output members
-
- 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
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7058—Rotary output members
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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
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/68—Inputs being a function of gearing status
- F16H2059/6838—Sensing gearing status of hydrostatic transmissions
- F16H2059/6861—Sensing gearing status of hydrostatic transmissions the pressures, e.g. high, low or differential pressures
-
- 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
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/14—Inputs being a function of torque or torque demand
- F16H59/26—Inputs being a function of torque or torque demand dependent on pressure
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Description
前記ロードセンシング機能を有する切換弁に対応して形成されたロードセンシングラインからの油圧信号を受け前記可変容量ポンプの吐出量を調整する吐出流量調整手段と、
前記可変容量ポンプの吐出ラインを分岐した第2の吐出ラインに接続され少なくとも1つの切換弁を含む第2の切換弁群と、
前記第2の切換弁群の上流側にて前記第2の吐出ラインに接続され前記第2の切換弁群に属する切換弁への操作圧信号に対応して開閉および絞り機能を有する開閉弁と、
前記開閉弁の下流側に設けられその一側は前記開閉弁の出口側の油圧力および所定バネ力とからなる付勢力により付勢されその他側は前記第2の吐出ラインの油圧力による付勢力によって付勢されており、前記一側の付勢力により前記開閉弁出口から供給される油量を全開方向に、前記他側の付勢力により前記開閉弁出口から供給される油量を絞るよう作用しその出口側が前記第2の切換弁群に接続されてなる補償弁と、からなる油圧制御装置であって、
前記補償弁には、前記一側の付勢力が他側の付勢力より優勢な状態のとき前記開閉弁出口側と接続されタンク側と連通するブリードオフ流路を設けたので、複数のアクチュエータを同時操作する比較的重負荷を操作する場合と単独に操作する比較的軽負荷を操作する場合とでブリードオフ機能を使い分けるようにし、軽負荷の場合にはブリードオフを機能させてハンチングによる障害を防ぎ、重負荷の場合にはブリードオフ機能を抑制して操作圧油の圧力低下および供給油量の不足を防ぐことにより油圧制御装置の操作性を高め、作業効率の向上を図ることができるという効果を奏する。
2 補償弁
2a スプール
2b スプール穴
3 スプリング
4 タンク通路
5 方向切換弁
5a スプール
6 旋回用油圧モータ
7 可変容量ポンプ
8 タンクライン
9 圧力室
10 圧力室
11 ロードセンシングライン
12、12A、12B 吐出ライン
13 吐出流量調整手段
14 制御弁
15 圧力発生手段
16 バネ
17A、17B、17C、17D、17E 通路
18 通路
19 逆止弁
20 内部通路
22 吐出ライン
36 信号ライン
24 逆止弁
26 バネ
28 タンク
30、32 信号ライン
34 シャトル弁
36 信号ライン
38 絞り
40 逆止弁
42 戻りライン
52 戻りライン
50、52 戻りライン
54、56 タンクライン
56 タンクライン
58、60 分流補償弁
62 絞り
64 逆止弁
66、68、70 通路
72 アームシリンダ
74、76 戻り油通路
78 通路
80 通路
82 逆止弁
84 ばね
86 バイパスライン
88 圧力調整手段
90 バネ
92 ロードセンシングライン
94 通路
96 圧力発生手段
98 通路
100 ブームシリンダ
102 通路
104 逆止弁
106 絞り
108 ポート
110 溝部
112、114、116、118、120、122、124、128、130、132 通路
134 ポート
136 開閉弁
138 補償弁
140 バネ
142 切換弁
144 通路
146 通路
148、148A ブリードオフ用通路
150 逆止弁
A 切換弁群
B 切換弁群
Claims (7)
- 可変容量ポンプと、前記可変容量ポンプの吐出ラインを分岐した第1の吐出ラインに接続されロードセンシング機能を有する切換弁を少なくとも1つ含む第1の切換弁群と、
前記ロードセンシング機能を有する切換弁に対応して形成されたロードセンシングラインからの油圧信号を受け前記可変容量ポンプの吐出量を調整する吐出流量調整手段と、
前記可変容量ポンプの吐出ラインを分岐した第2の吐出ラインに接続され少なくとも1つの切換弁を含む第2の切換弁群と、
前記第2の切換弁群の上流側にて前記第2の吐出ラインに接続され前記第2の切換弁群に属する切換弁への操作圧信号に対応して開閉および絞り機能を有する開閉弁と、
前記開閉弁の下流側に設けられその一側は前記開閉弁の出口側の油圧力および所定バネ力とからなる付勢力により付勢されその他側は前記第2の吐出ラインの油圧力による付勢力によって付勢されており、前記一側の付勢力により前記開閉弁出口から供給される油圧を開方向に、前記他側の付勢力により前記開閉弁入口から供給される油圧を閉方向となるよう作用しその出口側が前記第2の切換弁群に接続されてなる補償弁と、からなる油圧制御装置であって、
前記補償弁には、前記一側の付勢力が他側の付勢力より優勢な状態のとき前記開閉弁出口側と接続されタンク側と連通するブリードオフ用通路を設けたことを特徴とする油圧制御装置。 - 請求項1において、前記補償弁には、前記開閉弁出口側と前記ロードセンシングラインとの間に配置された逆止弁を有することを特徴とする油圧制御装置。
- 請求項1または2において、前記第2の切換弁群の少なくとも1つの切換弁は油圧ショベルの旋回用油圧モータと接続される切換弁であることを特徴とする油圧制御装置。
- 請求項1乃至3のいずれか1つにおいて、前記第2の切換弁群の少なくとも1つの切換弁は、前記開閉弁を内部に組み込んだ切換弁であることを特徴とする油圧制御装置。
- 請求項4において、前記第2の切換弁群の少なくとも1つの切換弁本体と前記補償弁本体とのポートが互いに共通となるよう両方の弁本体が一体的に形成されていることを特徴とする油圧制御装置。
- 請求項1乃至5のいずれか1つにおいて、前記第2の切換弁群の少なくとも1つの切換弁は、オープンセンター型切換弁であることを特徴とする油圧制御装置。
- 請求項1乃至6のいずれか1つにおいて、前記第1の切換弁群の切換弁の1つが油圧ショベルのブーム操作用切換弁であり且つ、前記第2の切換弁群の切換弁の1つは油圧ショベルの旋回用油圧モータの切換弁であることを特徴とする油圧制御装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005351979A JP4081487B2 (ja) | 2004-12-28 | 2005-12-06 | 油圧制御弁 |
GBGB0525773.8A GB0525773D0 (en) | 2004-12-28 | 2005-12-19 | Hydraulic control apparatus |
US11/315,188 US7305821B2 (en) | 2004-12-28 | 2005-12-23 | Hydraulic control apparatus |
GB0526521A GB2422445B (en) | 2004-12-28 | 2005-12-28 | Hydraulic control apparatus |
DE102005062798A DE102005062798B4 (de) | 2004-12-28 | 2005-12-28 | Hydraulische Steuerungsvorrichtung |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004381810 | 2004-12-28 | ||
JP2005351979A JP4081487B2 (ja) | 2004-12-28 | 2005-12-06 | 油圧制御弁 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2006207800A JP2006207800A (ja) | 2006-08-10 |
JP4081487B2 true JP4081487B2 (ja) | 2008-04-23 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2005351979A Active JP4081487B2 (ja) | 2004-12-28 | 2005-12-06 | 油圧制御弁 |
Country Status (4)
Country | Link |
---|---|
US (1) | US7305821B2 (ja) |
JP (1) | JP4081487B2 (ja) |
DE (1) | DE102005062798B4 (ja) |
GB (2) | GB0525773D0 (ja) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004048684A1 (de) * | 2004-10-06 | 2006-04-13 | Bosch Rexroth Ag | Hydraulische Steueranordnung |
JP5042471B2 (ja) * | 2005-06-30 | 2012-10-03 | コベルコ建機株式会社 | 建設機械の油圧制御装置 |
JP2008166062A (ja) * | 2006-12-27 | 2008-07-17 | Hitachi High-Technologies Corp | 真空容器を持つ装置 |
JP4840135B2 (ja) * | 2006-12-30 | 2011-12-21 | トヨタ自動車株式会社 | 車両用駆動装置の制御装置 |
JP5543236B2 (ja) * | 2010-02-10 | 2014-07-09 | 東芝機械株式会社 | 建設機械の油圧制御弁 |
CN102418355B (zh) * | 2010-09-28 | 2015-08-12 | 斗山工程机械(中国)有限公司 | 一种挖掘机及其斗杆的液压系统 |
US8702548B2 (en) * | 2011-11-03 | 2014-04-22 | Gm Global Technology Operations | Hydraulic control system for an automatic transmission |
EP2910795B1 (en) * | 2012-10-18 | 2019-06-26 | Hitachi Construction Machinery Co., Ltd. | Work machine |
JP6012806B1 (ja) * | 2015-04-15 | 2016-10-25 | Kyb株式会社 | バルブ装置及び流体圧制御装置 |
US10029540B2 (en) * | 2016-07-25 | 2018-07-24 | Caterpillar Inc. | Fluid delivery system |
CN107795279A (zh) * | 2017-12-06 | 2018-03-13 | 徐工集团工程机械有限公司 | 钻井机和工程车辆 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0516864B2 (en) | 1990-11-26 | 2001-12-12 | Hitachi Construction Machinery Co., Ltd. | Hydraulic driving system and direction change-over valves |
DE19639772C1 (de) | 1996-09-27 | 1998-04-02 | Orenstein & Koppel Ag | Load-Sensing-Hydraulikkreis einer mobilhydraulischen Bau- und Arbeitsmaschine |
US6082106A (en) * | 1997-10-17 | 2000-07-04 | Nachi-Fujikoshi Corp. | Hydraulic device |
JP3264651B2 (ja) | 1998-04-28 | 2002-03-11 | 東芝機械株式会社 | 油圧制御装置 |
EP1054162B1 (en) | 1998-12-03 | 2004-07-21 | Hitachi Construction Machinery Co., Ltd. | Hydraulic driving unit |
JP3851066B2 (ja) | 2000-07-19 | 2006-11-29 | トヨタ自動車株式会社 | ブレーキ装置 |
US6318079B1 (en) * | 2000-08-08 | 2001-11-20 | Husco International, Inc. | Hydraulic control valve system with pressure compensated flow control |
JP4668445B2 (ja) | 2001-03-29 | 2011-04-13 | 東芝機械株式会社 | 油圧制御装置、建設機械および油圧ショベル |
JP4128482B2 (ja) * | 2002-04-30 | 2008-07-30 | 東芝機械株式会社 | 油圧制御システム |
DE102004005606B3 (de) | 2004-02-05 | 2005-10-06 | Hydac Fluidtechnik Gmbh | Schaltungsanordnung |
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- 2005-12-19 GB GBGB0525773.8A patent/GB0525773D0/en not_active Ceased
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DE102005062798B4 (de) | 2008-07-31 |
GB0526521D0 (en) | 2006-02-08 |
US20060142107A1 (en) | 2006-06-29 |
US7305821B2 (en) | 2007-12-11 |
GB2422445A (en) | 2006-07-26 |
GB0525773D0 (en) | 2006-01-25 |
GB2422445B (en) | 2007-05-23 |
JP2006207800A (ja) | 2006-08-10 |
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