JPH0514802B2 - - Google Patents
Info
- Publication number
- JPH0514802B2 JPH0514802B2 JP60237503A JP23750385A JPH0514802B2 JP H0514802 B2 JPH0514802 B2 JP H0514802B2 JP 60237503 A JP60237503 A JP 60237503A JP 23750385 A JP23750385 A JP 23750385A JP H0514802 B2 JPH0514802 B2 JP H0514802B2
- Authority
- JP
- Japan
- Prior art keywords
- hydraulic actuator
- flow rate
- hydraulic pump
- variable displacement
- discharge
- 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.)
- Expired - Lifetime
Links
- 238000006073 displacement reaction Methods 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
Landscapes
- Fluid-Pressure Circuits (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
この発明は油圧アクチユエータの駆動流量を制
御する装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a device for controlling the drive flow rate of a hydraulic actuator.
第３図は従来の油圧アクチユエータ駆動流量制
御装置を示す図である。図において、１は可変容
量油圧ポンプ、２は油圧ポンプ１の吐出し流量制
御手段、４は油圧アクチユエータ、３は油圧ポン
プ１と油圧アクチユエータ４との間に設けられた
センタバイパス型の方向切換弁で、方向切換弁３
を中間切換位置にしたときには、油圧ポンプ１の
吐出圧油を油圧アクチユエータ４に導く第１の流
路および上記吐出圧油をタンクに導く第２の流路
に絞りが形成される。６は方向切換弁３の上記第
２の流路の出側とタンクとを接続する管路に設け
られたポペツト弁、５は油圧アクチユエータ４の
負荷圧力をポペツト弁６の背圧室に導くためのシ
ヤトル弁、３ａは方向切換弁３の操作レバー、７
は操作レバー３ａの操作量すなわち油圧アクチユ
エータ速度指令量を検出する検出器、１０は操作
レバー３ａの操作量に応じて油圧ポンプ１の吐出
し流量を指示する指示手段である。
FIG. 3 is a diagram showing a conventional hydraulic actuator drive flow rate control device. In the figure, 1 is a variable displacement hydraulic pump, 2 is a discharge flow control means for the hydraulic pump 1, 4 is a hydraulic actuator, and 3 is a center bypass type directional control valve provided between the hydraulic pump 1 and the hydraulic actuator 4. So, directional valve 3
When the hydraulic pump 1 is placed in the intermediate switching position, a restriction is formed in the first flow path that leads the discharge pressure oil of the hydraulic pump 1 to the hydraulic actuator 4 and the second flow path that leads the discharge pressure oil to the tank. 6 is a poppet valve provided in a pipe connecting the outlet side of the second flow path of the directional control valve 3 and the tank; 5 is a poppet valve for guiding the load pressure of the hydraulic actuator 4 to the back pressure chamber of the poppet valve 6; The shuttle valve 3a is the operation lever of the directional control valve 3, 7
10 is a detector for detecting the operation amount of the operation lever 3a, that is, the hydraulic actuator speed command amount, and 10 is an instruction means for instructing the discharge flow rate of the hydraulic pump 1 according to the operation amount of the operation lever 3a.
この制御装置においては、第４図に示すよう
に、方向切換弁３を中間切換位置にすると、油圧
ポンプ１の吐出圧油のうちの一部が油圧アクチユ
エータ４に供給され、その吐出圧油のうちの残り
がポペツト弁６を介してタンクに戻るが、この場
合油圧アクチユエータ４の負荷圧力p1とポペツト
弁６の入側の圧力p2とが等しくなるから、方向切
換弁３の第１、第２の流路に形成された絞りの前
後差圧p0−p1，p0−p2が等しくなるので、第１、
第２の流路に形成された絞りの開口面積をA1，
A2、第１の流路を流れる流量すなわち油圧アク
チユエータ４の駆動流量をQ1、第２の流路を流
れる流量をQ2とすると、次式の関係が成立する。 In this control device, as shown in FIG. 4, when the directional switching valve 3 is set to the intermediate switching position, a part of the pressure oil discharged from the hydraulic pump 1 is supplied to the hydraulic actuator 4, and the pressure oil discharged from the hydraulic pump 1 is supplied to the hydraulic actuator 4. The remainder returns to the tank via the poppet valve 6, but in this case, the load pressure p1 of the hydraulic actuator 4 and the pressure p2 on the inlet side of the poppet valve 6 are equal, so the first, Since the differential pressures p 0 −p 1 and p 0 −p 2 across the throttle formed in the second flow path are equal, the first
The opening area of the aperture formed in the second flow path is A 1 ,
When A 2 is the flow rate flowing through the first flow path, that is, the driving flow rate of the hydraulic actuator 4 is Q 1 , and the flow rate flowing through the second flow path is Q 2 , the following relationship holds true.
Q1／Q2＝A1／A2
また、油圧ポンプ１の吐出し流量をQ0とする
と、次式の関係が成立する。 Q 1 /Q 2 =A 1 /A 2If the discharge flow rate of the hydraulic pump 1 is Q0 , then the following relationship holds true.
Q0＝Q1＋Q2
これらの２式から油圧アクチユエータ４の駆動
流量Q1を求めると、次式のようになる。 Q 0 =Q 1 +Q 2 The driving flow rate Q 1 of the hydraulic actuator 4 is determined from these two equations as shown in the following equation.
Q1＝｛A1／（A1＋A2）｝Q0
この式から明らかなように、駆動流量Q1は負
荷圧力p1に影響されず、駆動流量Q1は開口面積
A1，A2すなわち方向切換弁３のストローク量に
応じた値となる。そして、操作レバー３ａの操作
量とA1／（A1＋A2）との関係を第５図ａのよう
に定め、油圧ポンプ１の吐出し流量Q0を指示手
段１０によつて第５図ｂのように指示すると、油
圧アクチユエータ４の駆動流量Q1は第５図ｃの
ようになる。 Q 1 = {A 1 / (A 1 + A 2 )} Q 0 As is clear from this equation, the driving flow rate Q 1 is not affected by the load pressure p 1 , and the driving flow rate Q 1 is determined by the opening area.
A 1 and A 2 are values corresponding to the stroke amount of the directional control valve 3. Then, the relationship between the operation amount of the operating lever 3a and A 1 /(A 1 +A 2 ) is determined as shown in FIG. When instructed as shown in b, the driving flow rate Q1 of the hydraulic actuator 4 becomes as shown in FIG. 5c.
このように、油圧アクチユエータ４の駆動流量
Q1を方向切換弁３のストローク量すなわち開口
面積A1，A2と油圧ポンプ１の吐出し流量Q0とに
よつて定めれば、油圧アクチユエータ４の速度を
細かく制御することができる。 In this way, the drive flow rate of the hydraulic actuator 4
If Q 1 is determined by the stroke amount, that is, the opening areas A 1 , A 2 of the directional control valve 3 and the discharge flow rate Q 0 of the hydraulic pump 1, the speed of the hydraulic actuator 4 can be precisely controlled.
ところで、操作レバー３ａの操作量に対する油
圧アクチユエータ４の駆動流量特性は種々の作業
内容に応じてそれぞれ最適な特性であることが望
ましい。しかしながら、第３図に示した制御装置
においては、ある定まつた駆動流量特性しかとり
得ない。 Incidentally, it is desirable that the drive flow characteristics of the hydraulic actuator 4 with respect to the operation amount of the operation lever 3a be optimal characteristics depending on various types of work. However, the control device shown in FIG. 3 can only have certain fixed drive flow characteristics.
この発明は上述の問題点を解決するためになさ
れたもので、油圧アクチユエータの駆動流量特性
を作業内容に応じて任意に設定することができる
油圧アクチユエータ駆動流量制御装置を提供する
ことを目的とする。
This invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a hydraulic actuator drive flow rate control device that can arbitrarily set the drive flow characteristics of the hydraulic actuator depending on the work content. .
この目的を達成するため、この発明において
は、可変容量油圧ポンプと、その可変容量油圧ポ
ンプと油圧アクチユエータとの間に設けられ、か
つ中間切換位置において上記可変容量油圧ポンプ
の吐出圧油を上記油圧アクチユエータに導く第１
の流路および上記吐出圧油をタンクに導く第２の
流路に絞りが形成されるセンタバイパス型の方向
切換弁と、上記方向切換弁の上記第２の流路の出
側とタンクとを接続する管路に設けられ、かつ上
記油圧アクチユエータの負荷圧力が背圧室に導か
れたポペツト弁と、油圧アクチユエータ速度指令
量に応じて上記可変容量油圧ポンプの吐出し流量
を指示する指示手段とを有する油圧アクチユエー
タ駆動流量制御装置において、上記指示手段に上
記油圧アクチユエータ速度指令量と上記可変容量
油圧ポンプの吐出し流量との関係を示すグラフの
最小吐出し流量から最大吐出し流量に至るまでの
線の傾きが上記油圧アクチユエータ速度指令量に
よつて異なる関数関係を含む複数の関数関係を設
定し、上記関数関係のうちのいずれか一つを選択
する切換手段を設ける。
In order to achieve this object, the present invention is provided with a variable displacement hydraulic pump and a hydraulic actuator, and in an intermediate switching position, the discharge pressure oil of the variable displacement hydraulic pump is switched to the hydraulic pressure of the variable displacement hydraulic pump. The first leading to the actuator
a center bypass type directional switching valve in which a restriction is formed in a flow path and a second flow path that leads the discharge pressure oil to a tank; and an outlet side of the second flow path of the directional control valve and a tank. a poppet valve provided in the connecting pipe line and through which the load pressure of the hydraulic actuator is guided to a back pressure chamber; and an instruction means for instructing the discharge flow rate of the variable displacement hydraulic pump in accordance with the hydraulic actuator speed command amount. In the hydraulic actuator drive flow rate control device having the above-mentioned instruction means, a graph indicating the relationship between the hydraulic actuator speed command amount and the discharge flow rate of the variable displacement hydraulic pump, from the minimum discharge flow rate to the maximum discharge flow rate. A switching means is provided for setting a plurality of functional relationships including functional relationships in which the slope of the line differs depending on the hydraulic actuator speed command amount, and selecting any one of the functional relationships.
第１図はこの発明に係る油圧アクチユエータ駆
動流量制御装置を示す図である。図において、９
は操作レバー３ａの操作量に応じて油圧ポンプ１
の吐出し流量Q0を指示する指示手段で、指示手
段９には操作レバー３ａの操作量と油圧ポンプ１
の吐出し流量Q0との関数関係が複数設定されて
おり、これらの関数関係は第２図ａに示すH0〜
J0のように定められており、関数関係I0，J0を示
すグラフの最大吐出し流量に至るまでの線の傾き
は、操作レバー５の操作量が小さいときには小さ
く、操作レバー５の操作量が大きいときには大き
くなつている。８は指示手段９に設定された関数
関係H0〜J0のうちのいずれか一つを選択する切
換手段である。
FIG. 1 is a diagram showing a hydraulic actuator drive flow rate control device according to the present invention. In the figure, 9
is the hydraulic pump 1 depending on the amount of operation of the operating lever 3a.
The instruction means 9 indicates the amount of operation of the operating lever 3a and the hydraulic pump 1.
A plurality of functional relationships with the discharge flow rate Q 0 are set, and these functional relationships are shown in Figure 2 a from H 0 to
J 0 , and the slope of the line up to the maximum discharge flow rate in the graph showing the functional relationship I 0 , J 0 is small when the amount of operation of the operation lever 5 is small; When the amount is large, it becomes large. Reference numeral 8 denotes a switching means for selecting any one of the functional relationships H 0 to J 0 set in the indicating means 9 .
この制御装置においては、切換手段８により関
数関係H0〜J0のうちのいずれか一つを選択する
と、選択された関数関係に応じて指示手段９によ
り油圧ポンプ１の吐出し流量Q0が指示されるの
で、油圧アクチユエータ４の駆動流量特性を第２
図ａに示すH1〜J1のうちのいずれか一つとする
ことが可能であるから、すなわち関数関係をI0，
J0としたときには、油圧アクチユエータ４の駆動
流量特性はI1，J1となり、操作レバー５の操作量
を小さくしたときには、油圧アクチユエータ４の
駆動流量特性を示すグラフの線の傾きを小さくす
ることができ、操作レバー５の操作量を大きくし
たときには、油圧アクチユエータ４の駆動流量特
性を示すグラフの線の傾きを大きくすることがで
きるから、油圧アクチユエータ４の駆動流量特性
を作業内容に応じて任意に設定することができ
る。 In this control device, when any one of the functional relations H 0 to J 0 is selected by the switching means 8, the discharge flow rate Q 0 of the hydraulic pump 1 is controlled by the indicating means 9 according to the selected functional relation. Since the instruction is given, the drive flow characteristics of the hydraulic actuator 4 are set to the second
Since it is possible to take any one of H 1 to J 1 shown in Figure a, that is, the functional relationship can be I 0 ,
When J 0 , the driving flow characteristics of the hydraulic actuator 4 become I 1 and J 1 , and when the operation amount of the operating lever 5 is decreased, the slope of the line of the graph showing the driving flow characteristics of the hydraulic actuator 4 becomes smaller. When the amount of operation of the operating lever 5 is increased, the slope of the line on the graph showing the drive flow characteristics of the hydraulic actuator 4 can be increased, so the drive flow characteristics of the hydraulic actuator 4 can be changed arbitrarily depending on the work content. Can be set to .
なお、上述実施例においては、操作レバー３ａ
の操作量と油圧ポンプ１の吐出し流量Q0との関
数関係を段階的に設定したが、この関数関係を連
続的に設定してもよい。 In addition, in the above-mentioned embodiment, the operating lever 3a
Although the functional relationship between the operation amount and the discharge flow rate Q 0 of the hydraulic pump 1 is set in stages, this functional relationship may be set continuously.
以上説明したように、この発明に係る油圧アク
チユエータ駆動流量制御装置においては、油圧ア
クチユエータ駆動流量特性を作業内容に応じて任
意に設定することができるから、操作性が向上す
る。このように、この発明の効果は顕著である。
As described above, in the hydraulic actuator drive flow rate control device according to the present invention, the hydraulic actuator drive flow rate characteristics can be arbitrarily set according to the work content, so that operability is improved. As described above, the effects of this invention are remarkable.
第１図はこの発明に係る油圧アクチユエータ駆
動流量制御装置を示す図、第２図は第１図に示し
た制御装置の動作を説明するためのグラフ、第３
図は従来の油圧アクチユエータ駆動流量制御装置
を示す図、第４図は第３図に示した制御装置の動
作説明図、第５図は第３図に示した制御装置の動
作を説明するためのグラフである。
１……可変容量油圧ポンプ、３……方向切換
弁、３ａ……操作レバー、４……油圧アクチユエ
ータ、６……ポペツト弁、８……切換手段、９…
…指示手段。
FIG. 1 is a diagram showing a hydraulic actuator drive flow rate control device according to the present invention, FIG. 2 is a graph for explaining the operation of the control device shown in FIG. 1, and FIG.
The figure shows a conventional hydraulic actuator drive flow rate control device, FIG. 4 is an explanatory diagram of the operation of the control device shown in FIG. 3, and FIG. 5 is a diagram for explaining the operation of the control device shown in FIG. 3. It is a graph. DESCRIPTION OF SYMBOLS 1... Variable capacity hydraulic pump, 3... Directional switching valve, 3a... Operating lever, 4... Hydraulic actuator, 6... Poppet valve, 8... Switching means, 9...
...means of instruction.
Claims (1)
ンプと油圧アクチユエータとの間に設けられ、か
つ中間切換位置において上記可変容量油圧ポンプ
の吐出圧油を上記油圧アクチユエータに導く第１
の流路および上記吐出圧油をタンクに導く第２の
流路に絞りが形成されるセンタバイパス型の方向
切換弁と、上記方向切換弁の上記第２の流路の出
側とタンクとを接続する管路に設けられ、かつ上
記油圧アクチユエータの負荷圧力が背圧室に導か
れたポペツト弁と、油圧アクチユエータ速度指令
量に応じて上記可変容量油圧ポンプの吐出し流量
を指示する指示手段とを有する油圧アクチユエー
タ駆動流量制御装置において、上記指示手段に上
記油圧アクチユエータ速度指令量と上記可変容量
油圧ポンプの吐出し流量との関係を示すグラフの
最小吐出し流量から最大吐出し流量に至るまでの
線の傾きが上記油圧アクチユエータ速度指令量に
よつて異なる関数関係を含む複数の関数関係を設
定し、上記関数関係のうちのいずれか一つを選択
する切換手段を設けたことを特徴とする油圧アク
チユエータ駆動流量制御装置。1 a variable displacement hydraulic pump, and a first valve that is provided between the variable displacement hydraulic pump and the hydraulic actuator and that guides the discharge pressure oil of the variable displacement hydraulic pump to the hydraulic actuator at an intermediate switching position.
a center bypass type directional switching valve in which a restriction is formed in a flow path and a second flow path that leads the discharge pressure oil to a tank; and an outlet side of the second flow path of the directional control valve and a tank. a poppet valve provided in the connecting pipe line and through which the load pressure of the hydraulic actuator is guided to a back pressure chamber; and an instruction means for instructing the discharge flow rate of the variable displacement hydraulic pump in accordance with the hydraulic actuator speed command amount. In the hydraulic actuator drive flow rate control device having the above-mentioned instruction means, a graph indicating the relationship between the hydraulic actuator speed command amount and the discharge flow rate of the variable displacement hydraulic pump, from the minimum discharge flow rate to the maximum discharge flow rate. A hydraulic system characterized by setting a plurality of functional relationships including functional relationships whose line slopes differ depending on the hydraulic actuator speed command amount, and providing a switching means for selecting any one of the functional relationships. Actuator driven flow control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23750385A JPS6298003A (en) | 1985-10-25 | 1985-10-25 | Hydraulic actuator driving flow control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23750385A JPS6298003A (en) | 1985-10-25 | 1985-10-25 | Hydraulic actuator driving flow control |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6298003A JPS6298003A (en) | 1987-05-07 |
| JPH0514802B2 true JPH0514802B2 (en) | 1993-02-26 |
Family
ID=17016279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23750385A Granted JPS6298003A (en) | 1985-10-25 | 1985-10-25 | Hydraulic actuator driving flow control |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6298003A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0226304A (en) * | 1988-07-12 | 1990-01-29 | Kubota Ltd | Hydraulic circuit structure for farm working vehicle |
| WO1995015441A1 (en) * | 1993-11-30 | 1995-06-08 | Hitachi Construction Machinery Co. Ltd. | Hydraulic pump controller |
| JP2822907B2 (en) * | 1995-02-08 | 1998-11-11 | 油谷重工株式会社 | Hydraulic control device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5843537A (en) * | 1981-09-09 | 1983-03-14 | Fujitsu Ltd | Preparation of multi wiring layer structure |
| JPS58203202A (en) * | 1982-05-22 | 1983-11-26 | Daikin Ind Ltd | Hydraulic circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5979601U (en) * | 1982-11-22 | 1984-05-29 | ダイキン工業株式会社 | Cavitation prevention circuit |
-
1985
- 1985-10-25 JP JP23750385A patent/JPS6298003A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5843537A (en) * | 1981-09-09 | 1983-03-14 | Fujitsu Ltd | Preparation of multi wiring layer structure |
| JPS58203202A (en) * | 1982-05-22 | 1983-11-26 | Daikin Ind Ltd | Hydraulic circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6298003A (en) | 1987-05-07 |
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