JPH05172107A - Capacity control device for variable hydraulic pump - Google Patents
Capacity control device for variable hydraulic pumpInfo
- Publication number
- JPH05172107A JPH05172107A JP3355648A JP35564891A JPH05172107A JP H05172107 A JPH05172107 A JP H05172107A JP 3355648 A JP3355648 A JP 3355648A JP 35564891 A JP35564891 A JP 35564891A JP H05172107 A JPH05172107 A JP H05172107A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- pump
- delivery pressure
- supplied
- hydraulic pump
- 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.)
- Pending
Links
Landscapes
- Fluid-Pressure Circuits (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、１つの可変油圧ポンプ
の吐出圧油を複数の油圧アクチュエータに供給する油圧
回路に用いられた可変油圧ポンプの容量を制御する装置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for controlling the capacity of a variable hydraulic pump used in a hydraulic circuit that supplies the hydraulic fluid discharged from one variable hydraulic pump to a plurality of hydraulic actuators.
【０００２】[0002]
【従来の技術】１つの油圧ポンプの吐出圧油を複数の油
圧アクチュエータに供給するには、可変油圧ポンプの吐
出路に複数の操作弁を設け、その操作弁を切換えること
で各油圧アクチュエータに圧油を供給すれば良いが、こ
のようにすると複数の油圧アクチユエータに圧油を同時
に供給する際に、負荷の小さな油圧アクチュエータにの
み圧油が供給されて負荷の大きな油圧アクチュエータに
圧油が供給されなくなってしまう。このことで解消する
油圧回路として、例えば特公平２−４９４０５号公報に
示すものが提案されている。2. Description of the Related Art In order to supply the hydraulic fluid discharged from one hydraulic pump to a plurality of hydraulic actuators, a plurality of operating valves are provided in the discharge passage of a variable hydraulic pump, and by switching the operating valves, the pressure is applied to each hydraulic actuator. Although it is sufficient to supply oil, when supplying pressure oil to multiple hydraulic actuators at the same time, pressure oil is supplied only to the hydraulic actuator with a small load and pressure oil is supplied to the hydraulic actuator with a large load. It will be gone. As a hydraulic circuit to be solved by this, for example, the one shown in Japanese Patent Publication No. 2-49405 has been proposed.
【０００３】かかる油圧回路を模式的に示すと図１に示
すようになる。つまり、可変油圧ポンプ１の吐出路１ａ
に複数の操作弁２を設け、各操作弁２と各油圧アクチュ
エータ３を接続する回路４に圧力補償弁５をそれぞれ設
けると共に、各回路４の圧力、つまり負荷圧における最
も高い圧力をチェック弁６で負荷圧検出路７に検出し、
その検出した負荷圧を各圧力補償弁５の受圧部５ａに作
用してその負荷圧に見合う圧力にセットすると共に、ポ
ンプ吐出圧を制御弁８によって容量制御部９に供給して
可変油圧ポンプ１の容量を負荷圧に見合う値とし、各操
作弁２の出口側圧力を等しくして各操作弁２を同時操作
した時に各操作弁の開口面積に比例した分流比で各油圧
アクチュエータ３に圧油を供給できるようにしてある。
以上の説明において、可変油圧ポンプ１の容量とは１回
転した時に吐出する流量である。A schematic diagram of such a hydraulic circuit is shown in FIG. That is, the discharge passage 1a of the variable hydraulic pump 1
A plurality of operating valves 2 are provided, and a pressure compensating valve 5 is provided in each circuit 4 connecting each operating valve 2 and each hydraulic actuator 3, and the pressure of each circuit 4, that is, the highest pressure in the load pressure is checked by a check valve 6 To the load pressure detection path 7 with
The detected load pressure acts on the pressure receiving portion 5a of each pressure compensating valve 5 to set the pressure corresponding to the load pressure, and the pump discharge pressure is supplied to the displacement control portion 9 by the control valve 8 to supply the variable hydraulic pump 1 Is set to a value commensurate with the load pressure, the outlet side pressure of each operation valve 2 is made equal, and when each operation valve 2 is operated simultaneously, pressure oil is applied to each hydraulic actuator 3 at a diversion ratio proportional to the opening area of each operation valve. Is available.
In the above description, the capacity of the variable hydraulic pump 1 is the flow rate discharged after one rotation.
【０００４】かかる油圧回路であると、圧力補償弁５の
機能によって各油圧アクチュエータ３の負荷の大小に無
関係に操作弁２の開口面積に比例した流量分配ができる
から、１つの油圧ポンプ１の吐出圧油を操作弁２の操作
量に比例して各油圧アクチュエータ３にそれぞれ供給で
きる。また、制御弁８はポンプ吐出圧Ｐ0 と負荷圧ＰLS
によって切替作動して可変油圧ポンプ１の容量を制御す
ることで、ポンプ吐出圧Ｐ0 が負荷圧ＰLSより一定値高
くなるようにしている。With such a hydraulic circuit, the function of the pressure compensating valve 5 allows the flow rate distribution to be proportional to the opening area of the operating valve 2 regardless of the load of each hydraulic actuator 3, so that the discharge of one hydraulic pump 1 can be performed. The pressure oil can be supplied to each hydraulic actuator 3 in proportion to the operation amount of the operation valve 2. Further, the control valve 8 controls the pump discharge pressure P 0 and the load pressure P LS.
The pump discharge pressure P 0 is set to be higher than the load pressure P LS by a constant value by controlling the displacement of the variable hydraulic pump 1 by the switching operation.
【０００５】[0005]
【発明が解決しようとする課題】かかる容量制御装置で
は負荷圧検出路７にリリーフ弁１０を設けて負荷圧ＰLS
がリリーフ弁セット圧以上で差圧を発生させ、それによ
って可変ポンプ１の容量を最小とする、いわゆるカット
オフ機能を持たせている。しかしながら、リリーフ弁１
０からの流出流量以外に漏れ等誤差の要因が多く、可変
ポンプ１の容量が最小となる時の圧力が一定とならずに
カットオフ機能が不安定となる。In such a capacity control device, a relief valve 10 is provided in the load pressure detection path 7 to provide the load pressure P LS.
Has a so-called cut-off function that minimizes the displacement of the variable pump 1 by generating a differential pressure above the relief valve set pressure. However, the relief valve 1
In addition to the outflow rate from 0, there are many factors such as errors such as leakage, and the pressure when the capacity of the variable pump 1 becomes the minimum is not constant and the cutoff function becomes unstable.
【０００６】そこで、本発明は前述の課題を解決できる
ようにした可変油圧ポンプの容量制御装置を提供するこ
とを目的とする。Therefore, an object of the present invention is to provide a displacement control device for a variable hydraulic pump, which can solve the above-mentioned problems.
【０００７】[0007]
【課題を解決するための手段】可変油圧ポンプ１の容量
をポンプ吐出圧Ｐ0 とフィードバックリンク１８でトル
ク一定制御する第１制御弁１５と、ポンプ吐出圧Ｐ0 と
前記最高負荷圧とによって可変油圧ポンプ１の容量をポ
ンプ吐出圧Ｐ0 が最高負荷圧ＰLSより一定値高くなるよ
うに制御する第２制御弁１６と、前記第１制御弁１５を
ポンプ吐出圧によらず容量少方向に作動するソレノイド
２１と、可変油圧ポンプ１のポンプ吐出圧が設定圧力の
時に前記ソレノイド２１に通電するコントローラ２２を
設けた可変油圧ポンプの容量制御装置。A first control valve 15 to the displacement of the variable hydraulic pump 1 to the torque constant control by the pump discharge pressure P 0 and the feedback link 18. Means for Solving the Problems], variable between the pump discharge pressure P 0 by the said maximum load pressure The second control valve 16 for controlling the displacement of the hydraulic pump 1 so that the pump discharge pressure P 0 is higher than the maximum load pressure P LS by a constant value, and the first control valve 15 are set in the direction of small displacement regardless of the pump discharge pressure. A displacement control device for a variable hydraulic pump, comprising a solenoid 21 that operates and a controller 22 that energizes the solenoid 21 when the pump discharge pressure of the variable hydraulic pump 1 is a set pressure.
【０００８】[0008]
【作 用】ポンプ吐出圧Ｐ0 が設定圧となった時にカ
ットオフできてカットオフ機能が安定するし、カットオ
フする時のポンプ吐出圧Ｐ0 を任意に変更できる。[Operation] When the pump discharge pressure P 0 reaches the set pressure, the cutoff can be made stable and the cutoff function is stable, and the pump discharge pressure P 0 at the time of cutoff can be arbitrarily changed.
【００１０】[0010]
【実 施 例】図２に示すように、可変ポンプ１の容量
は斜板１１の傾転角度をサーボシリンダ１２で変更する
ことで増減され、そのサーボピストン１２の小径室１３
に圧油が供給されて矢印ａ方向に摺動すると容量が増大
し、大径室１４に圧油が供給されて矢印ｂ方向に摺動す
ると容量が減少する。前記サーボピストン１２の小径室
１３にはポンプ吐出圧Ｐ0 が常時供給され、大径室１４
には第１制御弁１５と第２制御弁１６でポンプ吐出圧Ｐ
0 が供給され、第１制御弁１５は第１受圧部１７に作用
するポンプ吐出圧Ｐ0 で連通位置Ａに押され、サーボピ
ストン１２に連結されたフィードバックリンク１８でド
レーン位置Ｂに押されて可変油圧ポンプ１の容量は第１
制御弁１５によってポンプ吐出圧Ｐ0 と容量の積（トル
ク）一定に制御される。前記第２制御弁１６は第１受圧
部１９に作用するポンプ吐出圧Ｐ0 で供給位置Ｃに押さ
れ、第２受圧部２０に作用する負荷圧ＰLSでドレーン位
置Ｄに押され、この第２制御弁１６でポンプ吐出圧Ｐ0
が負荷圧ＰLSより一定値高くなるようにしている。[Example] As shown in FIG. 2, the capacity of the variable pump 1 is increased / decreased by changing the tilt angle of the swash plate 11 by the servo cylinder 12, and the small diameter chamber 13 of the servo piston 12 is changed.
When pressure oil is supplied to and slides in the direction of arrow a, the capacity increases, and when pressure oil is supplied to the large diameter chamber 14 and slides in the direction of arrow b, the capacity decreases. The pump discharge pressure P 0 is constantly supplied to the small diameter chamber 13 of the servo piston 12, and the large diameter chamber 14
In the first control valve 15 and the second control valve 16, the pump discharge pressure P
0 is supplied, the first control valve 15 is pushed to the communication position A by the pump discharge pressure P 0 acting on the first pressure receiving portion 17, and is pushed to the drain position B by the feedback link 18 connected to the servo piston 12. The variable hydraulic pump 1 has a first capacity
The control valve 15 controls the product (torque) of the pump discharge pressure P 0 and the capacity to be constant. The second control valve 16 is pushed to the supply position C by the pump discharge pressure P 0 acting on the first pressure receiving portion 19, and is pushed to the drain position D at the load pressure P LS acting on the second pressure receiving portion 20. 2 Control valve 16 pump discharge pressure P 0
Is higher than the load pressure P LS by a constant value.
【００１０】これにより、可変ポンプ１の容量は図３に
実線で示すようになるがカットオフ機能がないので、図
２に示すように第１制御弁１５にソレノイド２１を設
け、このソレノイド２１にコントローラ２２で通電する
ことで第１制御弁１５を供給位置Ａに押して斜板１１を
最小角度としてカットオフ機能を持たせる。前記コント
ローラ２２には圧力センサ２３からポンプ吐出圧Ｐ0 が
入力され、ポンプ吐出圧Ｐ0 が設定圧力となった時にソ
レノイド２１に通電するようにしてある。これにより、
可変油圧ポンプ１の容量は図３の点線で示すようにポン
プ吐出圧Ｐ0 が設定圧力の時に最小となってカットオフ
機能を有することになる。図２において、第２制御弁１
６は外部からの圧油が供給される第３受圧部２３を有
し、この第３受圧部２３に圧油を供給することでポンプ
吐出圧Ｐ0 と負荷圧ＰLSの差圧を変更できるようにして
ある。As a result, the capacity of the variable pump 1 becomes as shown by the solid line in FIG. 3, but since it does not have a cutoff function, a solenoid 21 is provided in the first control valve 15 as shown in FIG. By energizing the controller 22, the first control valve 15 is pushed to the supply position A and the swash plate 11 is set to the minimum angle to provide the cutoff function. The controller 22 receives the pump discharge pressure P 0 from the pressure sensor 23 and energizes the solenoid 21 when the pump discharge pressure P 0 reaches the set pressure. This allows
The capacity of the variable hydraulic pump 1 becomes minimum when the pump discharge pressure P 0 is the set pressure as shown by the dotted line in FIG. 3, and has a cut-off function. In FIG. 2, the second control valve 1
Reference numeral 6 has a third pressure receiving portion 23 to which pressure oil is supplied from the outside, and by supplying pressure oil to this third pressure receiving portion 23, the differential pressure between the pump discharge pressure P 0 and the load pressure P LS can be changed. Is done.
【００１１】[0011]
【発明の効果】ポンプ吐出圧Ｐ0 が設定圧となった時に
カットオフできてカットオフ機能が安定するし、カット
オフする時のポンプ吐出圧Ｐ0 を任意に変更できる。The pump discharge pressure P 0 can be cut off when the pump discharge pressure P 0 reaches the set pressure, the cutoff function is stabilized, and the pump discharge pressure P 0 at the time of cutoff can be arbitrarily changed.
【図１】従来の油圧回路図である。FIG. 1 is a conventional hydraulic circuit diagram.
【図２】本発明の実施例を示す線図的構成説明図であ
る。FIG. 2 is a diagrammatic configuration explanatory view showing an embodiment of the present invention.
【図３】可変油圧ポンプの圧力と容量の関係を示す図表
である。FIG. 3 is a chart showing a relationship between pressure and capacity of a variable hydraulic pump.
１…可変油圧ポンプ、１ａ…吐出路、２…操作弁、３…
アクチュエータ、４…回路、５…圧力補償弁、７…負荷
圧検出路、１５…第１制御弁、１６…第２制御弁、２１
…ソレノイド、２２…コントローラ。1 ... Variable hydraulic pump, 1a ... Discharge passage, 2 ... Operation valve, 3 ...
Actuator, 4 ... Circuit, 5 ... Pressure compensation valve, 7 ... Load pressure detection path, 15 ... First control valve, 16 ... Second control valve, 21
… Solenoid, 22… Controller.
Claims (1)
操作弁２を設け、各操作弁２とアクチュエータ３を接続
する回路４に圧力補償弁５をそれぞれ設け、前記各アク
チュエータ３の負荷圧における最高圧が検出される負荷
圧検出路７を前記各圧力補償弁５の受圧部５ａに接続し
た油圧回路において、 前記可変油圧ポンプ１の容量をポンプ吐出圧Ｐ0 とフィ
ードバックリンク１８でトルク一定制御する第１制御弁
１５と、ポンプ吐出圧Ｐ0 と前記最高負荷圧とによって
可変油圧ポンプ１の容量をポンプ吐出圧Ｐ0 が最高負荷
圧ＰLSより若干高くなるように制御する第２制御弁１６
と、前記第１制御弁１５をポンプ吐出圧によらず容量少
方向に作動するソレノイド２１と、可変油圧ポンプ１の
ポンプ吐出圧が設定圧力の時に前記ソレノイド２１に通
電するコントローラ２２を設けたことを特徴とする可変
油圧ポンプの容量制御装置。1. A plurality of operating valves 2 are provided in a discharge passage 1a of a variable hydraulic pump 1, a pressure compensating valve 5 is provided in a circuit 4 connecting each operating valve 2 and an actuator 3, and a load pressure of each actuator 3 is provided. In the hydraulic circuit in which the load pressure detection path 7 for detecting the maximum pressure in the above is connected to the pressure receiving portion 5a of each of the pressure compensating valves 5, the capacity of the variable hydraulic pump 1 is set to the pump discharge pressure P 0 and the torque constant by the feedback link 18. The first control valve 15 for controlling, and the second control for controlling the displacement of the variable hydraulic pump 1 by the pump discharge pressure P 0 and the maximum load pressure so that the pump discharge pressure P 0 is slightly higher than the maximum load pressure P LS. Valve 16
And a solenoid 21 for operating the first control valve 15 in a small capacity direction regardless of the pump discharge pressure, and a controller 22 for energizing the solenoid 21 when the pump discharge pressure of the variable hydraulic pump 1 is a set pressure. Variable hydraulic pump capacity control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3355648A JPH05172107A (en) | 1991-12-24 | 1991-12-24 | Capacity control device for variable hydraulic pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3355648A JPH05172107A (en) | 1991-12-24 | 1991-12-24 | Capacity control device for variable hydraulic pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05172107A true JPH05172107A (en) | 1993-07-09 |
Family
ID=18445054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3355648A Pending JPH05172107A (en) | 1991-12-24 | 1991-12-24 | Capacity control device for variable hydraulic pump |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05172107A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994010447A1 (en) * | 1992-10-29 | 1994-05-11 | Kabushiki Kaisha Komatsu Seisakusho | Capacity control device in variable capacity hydraulic pump |
| EP0821167A1 (en) | 1995-04-12 | 1998-01-28 | Komatsu Ltd. | Displacement controlling device for a variable displacement type hydraulic pump |
| JP2008507677A (en) * | 2004-07-26 | 2008-03-13 | ボルボ コンストラクション イクイップメント アーベー | Apparatus and method for controlling work vehicle |
| WO2009123134A1 (en) * | 2008-03-31 | 2009-10-08 | 株式会社小松製作所 | Rotation drive controlling system for construction machine |
| WO2015182268A1 (en) * | 2014-05-26 | 2015-12-03 | Ｋｙｂ株式会社 | Load-sensing control circuit |
-
1991
- 1991-12-24 JP JP3355648A patent/JPH05172107A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994010447A1 (en) * | 1992-10-29 | 1994-05-11 | Kabushiki Kaisha Komatsu Seisakusho | Capacity control device in variable capacity hydraulic pump |
| EP0821167A1 (en) | 1995-04-12 | 1998-01-28 | Komatsu Ltd. | Displacement controlling device for a variable displacement type hydraulic pump |
| JP2008507677A (en) * | 2004-07-26 | 2008-03-13 | ボルボ コンストラクション イクイップメント アーベー | Apparatus and method for controlling work vehicle |
| JP4769801B2 (en) * | 2004-07-26 | 2011-09-07 | ボルボ コンストラクション イクイップメント アーベー | Apparatus and method for controlling work vehicle |
| WO2009123134A1 (en) * | 2008-03-31 | 2009-10-08 | 株式会社小松製作所 | Rotation drive controlling system for construction machine |
| JP5130353B2 (en) * | 2008-03-31 | 2013-01-30 | 株式会社小松製作所 | Swivel drive control system for construction machinery |
| US9022749B2 (en) | 2008-03-31 | 2015-05-05 | Komatsu Ltd. | Swing drive controlling system for construction machine |
| WO2015182268A1 (en) * | 2014-05-26 | 2015-12-03 | Ｋｙｂ株式会社 | Load-sensing control circuit |
| JP2015224657A (en) * | 2014-05-26 | 2015-12-14 | Ｋｙｂ株式会社 | Load sensing control circuit |
| CN105392999A (en) * | 2014-05-26 | 2016-03-09 | Ｋｙｂ株式会社 | Load-sensing control circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4122468B2 (en) | Instant start flow amplification dynamic load signal fluid controller | |
| JPH04136507A (en) | Hydraulic circuit | |
| JPH0674204A (en) | Hydraulic type controller for plurality of consuming equipment | |
| JPH05172107A (en) | Capacity control device for variable hydraulic pump | |
| JP3104809B2 (en) | Hydraulic drive of hydraulic working machine | |
| JPH0599126A (en) | Capacity control device for variable capacity type hydraulic pump | |
| JPH05172111A (en) | Variable hydraulic pump capacity control device for pressure-compensating hydraulic circuit | |
| JP3685287B2 (en) | Capacity controller for variable displacement hydraulic pump | |
| JP2557002B2 (en) | Operation valve used for hydraulic circuit | |
| JP2794874B2 (en) | Industrial vehicle hydraulics | |
| JP2563216B2 (en) | Hydraulic circuit | |
| JPH0828506A (en) | Pressure compensating valve | |
| JPH0518365A (en) | Capacity controller for variable capacity type hydraulic pump | |
| JP2556999B2 (en) | Hydraulic circuit | |
| JP3553651B2 (en) | Displacement control device for variable displacement hydraulic pump | |
| JPH07293508A (en) | Hydraulic control device | |
| JP2556998B2 (en) | Hydraulic circuit | |
| JPH03204375A (en) | Hydraulic device of industrial vehicle | |
| JPH0689762B2 (en) | Actuator speed controller | |
| JP3112189B2 (en) | Displacement control device for variable displacement hydraulic pump | |
| JPH10182095A (en) | Forklift truck cargo handling controller | |
| JPH03225088A (en) | Variable displacement type liquid pressure device | |
| JP2000310205A (en) | Hydraulic control device | |
| JPH04203502A (en) | Automatic engine speed regulator in load sensing system | |
| JPH0791403A (en) | Pressure oil supply device |