JP2011074970A - Hydraulic circuit device - Google Patents

Hydraulic circuit device Download PDF

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Publication number
JP2011074970A
JP2011074970A JP2009225308A JP2009225308A JP2011074970A JP 2011074970 A JP2011074970 A JP 2011074970A JP 2009225308 A JP2009225308 A JP 2009225308A JP 2009225308 A JP2009225308 A JP 2009225308A JP 2011074970 A JP2011074970 A JP 2011074970A
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Japan
Prior art keywords
pump
actuator
switching valves
valve
circuit device
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JP2009225308A
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Japanese (ja)
Inventor
Masao Kashiwagi
雅夫 柏木
Yoshitaka Mizuta
義隆 水田
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KYB Corp
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KYB Corp
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Priority to JP2009225308A priority Critical patent/JP2011074970A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To simply perform a stroke control of a spool, by solving such problems that a size of a selector valve is increased, for example, when actuators for a supersized construction machine is controlled by a single selector valve, and the increase in size of the selector valve makes it difficult to perform the stroke control of the spool. <P>SOLUTION: In each of the process of passage connecting a pump P with actuators A1, A2, pairs of selector valves 1, 2 and selector valves 5, 6 connected in parallel with respect to the pump P and the actuators A1, A2 are provided. According to control characteristics of the pairs of selector valves 1, 2 and selector valves 5, 6, a supply flow rate from the pump P to the actuators A1, A2 is controlled. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

この発明は、1つのアクチュエータに2系統の切換弁を接続した油圧回路装置に関する。   The present invention relates to a hydraulic circuit device in which two switching valves are connected to one actuator.

1つのアクチュエータに2系統の切換弁を接続した油圧回路装置として、例えば、建設機械におけるブームシリンダやアームシリンダの2速制御用の回路が従来から知られている。
この種の油圧回路装置は、上記2系統の切換弁を別々のポンプに接続し、1つのアクチュエータに、1つのポンプの吐出油のみを供給したり、2つのポンプからの吐出油を合流させてアクチュエータに供給したりして、アクチュエータの作動速度をしている。
As a hydraulic circuit device in which two switching valves are connected to one actuator, for example, a circuit for two-speed control of a boom cylinder and an arm cylinder in a construction machine is conventionally known.
In this type of hydraulic circuit device, the two switching valves are connected to separate pumps, and only one pump discharge oil is supplied to one actuator, or the discharge oil from two pumps is joined. Actuating the actuator by supplying it to the actuator.

特開平10−331209号公報Japanese Patent Laid-Open No. 10-331209

上記のようにした従来の油圧回路装置では、1つのアクチュエータに一対の切換弁を接続するとともに、それら切換弁は別々のポンプに接続されているので、1つのポンプの供給量を、2つのバルブが一体になって制御するものではない。言い換えると、従来の油圧回路装置では、2速制御は可能であるが、それら切換弁を選択制御することとによって、多様な制御特性が得られるものではなかった。
この発明の目的は、2つの切換弁を用いて多様な制御特性が得られる油圧回路装置を提供することである。
In the conventional hydraulic circuit device as described above, a pair of switching valves are connected to one actuator, and the switching valves are connected to separate pumps. Are not integrated and controlled. In other words, in the conventional hydraulic circuit device, the two-speed control is possible, but various control characteristics cannot be obtained by selectively controlling these switching valves.
An object of the present invention is to provide a hydraulic circuit device capable of obtaining various control characteristics using two switching valves.

第1の発明は、ポンプとアクチュエータをつなぐ通路過程に、当該ポンプおよびアクチュエータに対して並列に接続した一対の切換弁を設け、これら一対の切換弁の制御特性に応じて、上記ポンプから上記アクチュエータへの供給流量を制御する構成にしたものである。
第2の発明は、上記一対の切換弁のうち、一方の切換弁のバルブ容量を、他方の切換弁のバルブ容量よりも大きくしたものである。
According to a first aspect of the present invention, a pair of switching valves connected in parallel to the pump and the actuator are provided in a passage process connecting the pump and the actuator, and the actuator is connected to the actuator according to control characteristics of the pair of switching valves It is configured to control the supply flow rate to.
2nd invention makes the valve capacity | capacitance of one switching valve larger than the valve capacity | capacitance of the other switching valve among a pair of said switching valves.

第1,2の発明によれば、一対の切換弁のそれぞれの開度を、個別に制御することによって、アクチュエータに対する流量をいかようにも制御できる。言い換えると、一対の切換弁の制御特性に応じて、アクチュエータに供給する流量を制御することができる。
また、上記切換弁の制御特性、特に、微小制御の特性は、スプールに形成したノッチによって決められるが、大型バルブの場合には、ノッチを形成したとしても、スプールのわずかなストロークでも大きな流量が流れてしまうので、熟練オペレータでなければ操作できない。
According to the first and second inventions, the flow rate with respect to the actuator can be controlled in any way by individually controlling the opening degrees of the pair of switching valves. In other words, the flow rate supplied to the actuator can be controlled according to the control characteristics of the pair of switching valves.
In addition, the control characteristics of the switching valve, particularly the micro control characteristics, are determined by the notch formed in the spool. However, in the case of a large valve, even if the notch is formed, a large flow rate can be obtained even with a slight stroke of the spool. Since it will flow, it can be operated only by skilled operators.

しかし、この発明のようにポンプおよびアクチュエータのそれぞれに対して、一対のバルブを並列にすることによって、例えば一方の切換弁のバルブ容量を、他方の切換弁のバルブ容量よりも大きくするというように、両者のバルブ容量に変化を与えることによって、容量が小さい切換弁側で微小制御が可能になる。   However, by arranging a pair of valves in parallel with each of the pump and the actuator as in the present invention, for example, the valve capacity of one switching valve is made larger than the valve capacity of the other switching valve. By giving a change to both valve capacities, minute control can be performed on the switching valve side having a small capacity.

この発明の回路図である。It is a circuit diagram of this invention.

図示の実施形態は、1台のポンプPと、このポンプPの吐出油が供給される油圧モータA1と油圧シリンダA2とを備えている。
そして、上記油圧モータA1には一対の切換弁1,2を並列に接続するとともに、これら切換弁1,2は、供給通路3,4を介してポンプPと並列に接続されている。
また、上記油圧シリンダA2には一対の切換弁5,6を並列に接続するとともに、これら切換弁5,6は、パラレル通路7,8を介してポンプPと並列に接続されている。
The illustrated embodiment includes a single pump P, and a hydraulic motor A1 and a hydraulic cylinder A2 to which oil discharged from the pump P is supplied.
A pair of switching valves 1 and 2 are connected in parallel to the hydraulic motor A 1, and these switching valves 1 and 2 are connected in parallel with the pump P through supply passages 3 and 4.
A pair of switching valves 5 and 6 are connected in parallel to the hydraulic cylinder A 2, and these switching valves 5 and 6 are connected in parallel with the pump P through parallel passages 7 and 8.

上記のようにした切換弁1および2は、図示の中立位置にあるとき、その中立ポート9,10が開き、左右いずれかの切り換え位置にあるとき、アクチュエータポート11〜14が開いてポンプPからの吐出油を油圧モータA1に供給するとともに、油圧モータA1からの戻り油をタンクTに導く。   When the switching valves 1 and 2 as described above are in the illustrated neutral position, the neutral ports 9 and 10 are opened, and when the switching valves 1 and 2 are in either the left or right switching position, the actuator ports 11 to 14 are opened and the pump P is opened. The discharged oil is supplied to the hydraulic motor A1, and the return oil from the hydraulic motor A1 is guided to the tank T.

さらに、切換弁5,6は、図示の中立位置にあるとき、その中立ポート15,16が開き、左右いずれかの切り換え位置にあるとき、アクチュエータポート17〜20が開いてポンプPからの吐出油を油圧シリンダA2に供給するとともに、油圧シリンダA2からの戻り油をタンクTに導く。   Further, when the switching valves 5 and 6 are in the illustrated neutral position, the neutral ports 15 and 16 are opened, and when the switching valves 5 and 6 are in either of the left and right switching positions, the actuator ports 17 to 20 are opened and the oil discharged from the pump P is discharged. Is supplied to the hydraulic cylinder A2, and the return oil from the hydraulic cylinder A2 is guided to the tank T.

上記のようにした油圧回路装置においては、1台のポンプPの吐出油を、切換弁1,2に分流させて油圧モータA1に供給するようにしているので、例えば、切換弁1で大流量を制御し、切換弁2で小流量を制御することができ、超大型の建設機械の微小制御もやり易くなる。   In the hydraulic circuit device configured as described above, the discharge oil of one pump P is divided into the switching valves 1 and 2 and supplied to the hydraulic motor A1. And the small flow rate can be controlled by the switching valve 2, and it is easy to perform minute control of the super large construction machine.

つまり、超大型の建設機械では、当該油圧回路装置に大流量が流通するが、その大流量に対応するために、切換弁も大型化せざるを得ない。
もし、1つの切換弁だけで、超大型の建設機械に対応するために、その切換弁を大型化すると、スプールをわずかに移動しただけで、大流量が流れてしまうので、その微小制御が難しくなる。しかし、この実施形態のように、2種類の切換弁をポンプPおよび油圧モータA1に並列に接続しておけば、いずれか一方の切換弁に微小制御を担わせることができるので、超大型化にも対応することができる。
上記のことは、油圧シリンダA2に関しても同様のことが言える。
That is, in a very large construction machine, a large flow rate flows through the hydraulic circuit device, but in order to cope with the large flow rate, the switching valve must be enlarged.
If only one selector valve is used to handle an ultra-large construction machine, if the selector valve is enlarged, a large flow rate will flow just by moving the spool slightly. Become. However, if two types of switching valves are connected in parallel to the pump P and the hydraulic motor A1 as in this embodiment, one of the switching valves can be assigned minute control. Can also respond.
The same can be said for the hydraulic cylinder A2.

なお、この実施形態では、油圧モータA1と油圧シリンダA2とを用いたが、この発明では、どのようなアクチュエータを用いてもよい。
いずれにしても、ポンプとアクチュエータとの間に、2つの切換弁を並列に接続されていれば、アクチュエータの種類や切換弁の態様等は制限されない。
In this embodiment, the hydraulic motor A1 and the hydraulic cylinder A2 are used. However, in the present invention, any actuator may be used.
In any case, as long as two switching valves are connected in parallel between the pump and the actuator, the type of the actuator and the mode of the switching valve are not limited.

超大型の建設機械に用いるのに適している。   Suitable for use in very large construction machines.

P ポンプ
1,2 切換弁
A1 アクチュエータである油圧モータ
5,6 切換弁
A2 アクチュエータである油圧シリンダ
P Pump 1, 2 Switching valve A 1 Hydraulic motor 5, which is an actuator Switching valve A 2 Hydraulic cylinder, which is an actuator

Claims (2)

ポンプとアクチュエータをつなぐ通路過程に、当該ポンプおよびアクチュエータに対して並列に接続した一対の切換弁を設け、これら一対の切換弁の制御特性に応じて、上記ポンプから上記アクチュエータへの供給流量を制御する構成にした油圧回路装置。   A pair of switching valves connected in parallel to the pump and the actuator are provided in the passage process connecting the pump and the actuator, and the supply flow rate from the pump to the actuator is controlled according to the control characteristics of the pair of switching valves. Hydraulic circuit device configured to 上記一対の切換弁のうち、一方の切換弁のバルブ容量を、他方の切換弁のバルブ容量よりも大きくした請求項1記載の油圧回路装置。   2. The hydraulic circuit device according to claim 1, wherein a valve capacity of one of the pair of switching valves is larger than a valve capacity of the other switching valve.
JP2009225308A 2009-09-29 2009-09-29 Hydraulic circuit device Pending JP2011074970A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5947771U (en) * 1982-09-20 1984-03-29 株式会社小松製作所 Construction machinery hydraulic circuit
JP2002181008A (en) * 2000-12-18 2002-06-26 Kayaba Ind Co Ltd Hydraulic controller
JP2002339904A (en) * 2001-05-21 2002-11-27 Komatsu Ltd Hydraulic circuit for construction machine
JP2009047259A (en) * 2007-08-21 2009-03-05 Daikin Ind Ltd Hydraulic unit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5947771U (en) * 1982-09-20 1984-03-29 株式会社小松製作所 Construction machinery hydraulic circuit
JP2002181008A (en) * 2000-12-18 2002-06-26 Kayaba Ind Co Ltd Hydraulic controller
JP2002339904A (en) * 2001-05-21 2002-11-27 Komatsu Ltd Hydraulic circuit for construction machine
JP2009047259A (en) * 2007-08-21 2009-03-05 Daikin Ind Ltd Hydraulic unit

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