JPS61116103A - Two-speed converging circuit - Google Patents
Two-speed converging circuitInfo
- Publication number
- JPS61116103A JPS61116103A JP23511884A JP23511884A JPS61116103A JP S61116103 A JPS61116103 A JP S61116103A JP 23511884 A JP23511884 A JP 23511884A JP 23511884 A JP23511884 A JP 23511884A JP S61116103 A JPS61116103 A JP S61116103A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- port
- merging
- pilot
- switching
- 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
Classifications
-
- 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
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
-
- 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
-
- 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
- F15B2211/20576—Systems with pumps with multiple pumps
-
- 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
- F15B2211/30505—Non-return valves, i.e. 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
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/3056—Assemblies of multiple valves
- F15B2211/3059—Assemblies of multiple valves having multiple valves for multiple output members
- F15B2211/30595—Assemblies of multiple valves having multiple valves for multiple output members with additional valves between the groups of valves for multiple 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
- F15B2211/30—Directional control
- F15B2211/355—Pilot 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
- F15B2211/60—Circuit components or control therefor
- F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
- F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
-
- 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
- F15B2211/67—Methods for controlling pilot 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
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
- F15B2211/7142—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being arranged in multiple groups
-
- 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
- F15B2211/78—Control of multiple output members
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
【発明の詳細な説明】
（イ） 産業上の利用分野
この発明は２個のポンプと、この各ポンプによって制御
される２群の複数のアクチュエータとを備える建設機械
等の２速合流回路に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a two-speed merging circuit for construction machinery, etc., which includes two pumps and two groups of actuators controlled by each pump.
（ロ） 従来の技術
従来のこの種の２速合流回路は第２図に示すように、各
群のアクチュエータごとに合流弁を備えるのが一般的で
あった。すなわち２個の合流弁を必要としていた。(b) Prior Art As shown in FIG. 2, a conventional two-speed merging circuit of this type generally includes a merging valve for each group of actuators. In other words, two merging valves were required.
（ハ） 発明が解決しようとする問題点この従来技術に
は、合流弁が２個必要なため大きなスペースを必要とす
る欠点がある。また合流弁を切換えるためには、合流弁
のばね力、合流弁を通る流体力および背圧に打勝つ必要
があり、その駆動圧は一般にポンプ傾転制ｍ＋開始圧よ
りも高くなってしまう。このため合流弁が切換ねる前に
ポンプが高圧の油の吐出を開始してしまうので、合流側
ポンプに高圧が発生し、シリンダの動きも合流弁が開に
なったとき、急激に高圧油が流入してくるため衝撃的と
なり、作業性が悪いだけでなく、機器の寿命にも悪影響
を与えるという欠点があった。(c) Problems to be Solved by the Invention This prior art has the drawback of requiring a large space because two merging valves are required. Moreover, in order to switch the merging valve, it is necessary to overcome the spring force of the merging valve, the fluid force passing through the merging valve, and the back pressure, and the driving pressure thereof is generally higher than the pump tilting limit m+start pressure. For this reason, the pump starts discharging high-pressure oil before the merging valve switches, so high pressure is generated in the merging side pump, and the cylinder movement also increases when the merging valve opens. The inflow caused a shock, which not only resulted in poor workability but also had a negative impact on the lifespan of the equipment.
本発明は上記した従来の２速合流回路にみられた欠点を
解消するためになされたものであって、合流弁設置スペ
ースが少なくて済み、合流時には圧油が低圧からスムー
ズにシリンダに流入する２速合流回路を提供することを
目的とする。The present invention was made in order to eliminate the drawbacks of the conventional two-speed merging circuit described above, and the installation space for the merging valve is small, and when merging, pressure oil flows smoothly into the cylinder from low pressure. The purpose is to provide a two-speed merging circuit.
（ニ） 問題点を解決するための手段
このための本発明は、２個のポンプと、この各ポンプに
よって制御される２群の複数のアクチュエータと、各ポ
ンプと各アクチュエータとの間に設けられパイロット弁
を有する複数の切換弁とを備える建設機械等の油圧回路
において、一方のポンプの最下流側の切換弁Ａと、他方
のポンプの最下流側の切換弁Ｂとの間に１個の合流弁を
設け、この合流弁は５個のポートを有する３位置切換弁
とすると共に、合流弁の第１ポートと切換弁Ａの第１ポ
ート、合流弁の第２ポートと切換弁Ｂの第１ポートとを
それぞれ接続し、合流弁の第３ポートと２個のポンプの
吐出管路とをそれぞれチェック弁を介して接続し、合流
弁の第４ポートと切換弁Ａの第２パイロットポート及び
切換弁８の第２パイロットポートとをそれぞれ接続し、
合流弁の第５ポートとタンクとを接続し、かつ中立位置
において合流弁の第４ポートと合流弁の第５ポートとを
連通ずる一方、合流弁の一方のパイロットポートは切換
弁Ａの中立時にこのパイロット弁の第１パイロットポー
トを経てタンクに連通し、合流弁の他方のパイロットポ
ートは切換弁Ｂの中立時にこのパイロット弁の第１パイ
ロットポートを経てタンクに連通ずるように構成してな
る。(d) Means for Solving the Problems The present invention has two pumps, two groups of actuators controlled by each pump, and a plurality of actuators provided between each pump and each actuator. In a hydraulic circuit for construction machinery, etc., which is equipped with a plurality of switching valves each having a pilot valve, there is one switching valve between the switching valve A on the most downstream side of one pump and the switching valve B on the most downstream side of the other pump. A merging valve is provided, and the merging valve is a three-position switching valve having five ports, and the first port of the merging valve, the first port of the switching valve A, the second port of the merging valve, and the first port of the switching valve B. 1 port of the merging valve and the discharge pipes of the two pumps are respectively connected via check valves, and the 4th port of the merging valve and the second pilot port of the switching valve A and and the second pilot port of the switching valve 8, respectively.
The 5th port of the merging valve is connected to the tank, and the 4th port of the merging valve is communicated with the 5th port of the merging valve in the neutral position, while one pilot port of the merging valve is connected to the tank when the switching valve A is in the neutral position. The pilot valve is configured to communicate with the tank through the first pilot port, and the other pilot port of the merging valve is configured to communicate with the tank through the first pilot port of the pilot valve when the switching valve B is in the neutral state.
（ホ） 作用
２個のポンプの吐出油は、それぞれロードチェックを兼
ねたチェック弁を介して、あらかじめ合流弁に流入して
おり、合流を必要とする最下流側の切換弁Ａ、Ｂのいず
れかが合流位置に切換えられると、パイロット圧力は合
流弁のいずれか一方のパイロットポートに流入し、合流
弁を一方に切換え、合流を必要とするアクチュエータに
は２台のポンプからの吐出油量が供給される。従って、
他方のポンプの吐出圧は低圧の状態から合流を開始する
ことになる。(E) Effect The discharge oil from the two pumps flows into the merging valve in advance through a check valve that also serves as a load check, and the oil discharged from the two pumps flows into the merging valve in advance through the check valve that also serves as a load check. When the two pumps are switched to the merging position, pilot pressure flows into the pilot port of either one of the merging valves, switching the merging valve to one side, and discharging oil from the two pumps to the actuator that requires merging. Supplied. Therefore,
The discharge pressures of the other pump will start merging from a low pressure state.
くべ）実施例
以下、本発明の２速合流回路の実施例を図面により、詳
細に説明する。Embodiment) Hereinafter, embodiments of the two-speed merging circuit of the present invention will be described in detail with reference to the drawings.
第１図において、１および２は可変容積形のポンプで、
その傾転制御部ＩＡ、２Ａには、それぞれパイロット油
圧源２１．２２からパイロット圧が供給されている。、
２個のポンプ１．２の吐出油は、それぞれロードチェッ
クを兼ねたチェック弁１２．１３を介して、あらかじめ
合流させて後述する合流弁に流°入するようにしである
。３，４゜５はポンプ１によって制御されるアクチュエ
ータ用のパイロット弁付きの切換弁で、６，７．８はポ
ンプ２によって制御されるアクチュエータ用のパイロッ
ト弁付きの切換弁である。切換弁３，４゜５および６，
７．８はそれぞれ群をなしている。In FIG. 1, 1 and 2 are variable displacement pumps,
Pilot pressure is supplied to the tilt control units IA and 2A from pilot hydraulic pressure sources 21 and 22, respectively. ,
The oil discharged from the two pumps 1.2 is configured to be merged in advance through check valves 12.13 which also serve as load checks, and then flow into a merge valve to be described later. Reference numerals 3, 4 and 5 indicate switching valves with pilot valves for the actuators controlled by the pump 1, and 6, 7.8 indicate switching valves with pilot valves for the actuators controlled by the pump 2. Switching valves 3, 4° 5 and 6,
7.8 each form a group.
切換弁３，４，６．７は同じ構造をしており、合流を必
要としない各アクチュエータ１４．１５．１６．１７に
圧油を切換供給するようになっている。切換弁５，８は
切換弁Ａ、Ｂに相当し、パイロット弁が４ポートのもの
になっており、各切換弁群の最下流側に設けられ合流を
必要とするアクチュエータ９，１０の切換えを行うよう
になっている。合流を必要とするアクチュエータは一般
的には油圧シリンダであって、そのヘッド側に流体を供
給する場合にのみ単独または合流の選択を必要とし、ロ
ンド側に流体を供給する場合にはロッドの断面積だけシ
リンダの断面積が小さくなるために、合流させるとスピ
ードが早くなりすぎるので、単独のみの方が好都合なこ
とが多い。従って、切換弁５．８をアクチュエータ９．
１ｏのヘッド側に切換える場合には、単独または合流の
選択ができるように切換えストロークによってパイロッ
ト弁は単独位置（図のＡａまたはＢｂ位置）および合流
位置く図のＡｂ、またはＢａ位置）のどららかを選択で
きる構成になっている。１１は合流弁であって、最下流
側切換弁５，８の間に設けられており、パイロット付き
の３位置５ポート切換弁である。合流弁１１の第１のポ
ートＣ１は一方の切換弁群の最下流側切換弁５のポート
Ａ１と連通しており、合流弁１１の第２のポートＣ２は
他方の切換弁群の最下流側切換弁８のポートＢ１と連通
している。合流弁１１の第３のポートＣ３はチェック弁
１２．１３の下流と接続している。合流弁１１の第４の
ポートＣ４と第５のポートＣ５は中立位置において合流
弁内で連通しており、更に最下流側切換弁５．９のパイ
ロットポートＡ１２．８１２と連通している。合流弁１
１の第１パイロツトポートＣ１１は最下流側切換弁５の
パイロットポートＡ１１と連通している。また合流弁１
１の第２パイロットポートＣ１２は最下流側切換弁８の
パイロットポートＢ１１と連通している。The switching valves 3, 4, 6.7 have the same structure and are adapted to selectively supply pressure oil to each actuator 14, 15, 16, 17 that does not require merging. The switching valves 5 and 8 correspond to the switching valves A and B, and have a 4-port pilot valve, and are provided at the most downstream side of each switching valve group to switch the actuators 9 and 10 that require merging. It is supposed to be done. Actuators that require merging are generally hydraulic cylinders, and only when supplying fluid to the head side requires the selection of single or merging; when supplying fluid to the rond side, rod disconnection is required. Since the cross-sectional area of the cylinder is reduced by the area, the speed will be too high if they are combined, so it is often more convenient to use them alone. Therefore, the switching valve 5.8 is connected to the actuator 9.8.
When switching to the head side of 1o, the switching stroke allows the pilot valve to move between the independent position (Aa or Bb position in the figure) and the merge position (Ab or Ba position in the figure) so that you can select between independent and merging. The structure is such that you can select one. A merging valve 11 is provided between the most downstream switching valves 5 and 8, and is a 3-position, 5-port switching valve with a pilot. The first port C1 of the merging valve 11 communicates with the port A1 of the most downstream switching valve 5 of one switching valve group, and the second port C2 of the merging valve 11 communicates with the port A1 of the most downstream switching valve 5 of the other switching valve group. It communicates with port B1 of the switching valve 8. The third port C3 of the merging valve 11 is connected downstream of the check valve 12.13. The fourth port C4 and the fifth port C5 of the merging valve 11 communicate within the merging valve in the neutral position and further communicate with the pilot port A12.812 of the most downstream switching valve 5.9. Merging valve 1
The first pilot port C11 of No. 1 communicates with the pilot port A11 of the most downstream switching valve 5. Also, merging valve 1
The second pilot port C12 of No. 1 communicates with the pilot port B11 of the most downstream switching valve 8.
パイロットポートＡ１ Ｌ Ｂｌ １は中立状態におい
てそれぞれタンク２３と連通している。The pilot ports A1 L Bl 1 are in communication with the tank 23, respectively, in the neutral state.
次に実施例の作用について説明する。Next, the operation of the embodiment will be explained.
ポンプ１．２はパイロット油圧源２１．２２によってそ
れぞれ傾転角を制御されており、切換弁群が中立のとき
には、パイロット油圧源はタンクに解放されているため
、ポンプ１．２の傾転角はほぼ中立位置に保持され、流
体の吐出は事実上ゼロであり、微小油量がバイパス弁２
４．２５を経てタンク２３に戻っている。The tilting angles of the pumps 1.2 are controlled by pilot hydraulic power sources 21 and 22, respectively, and when the switching valve group is in neutral, the pilot hydraulic power source is released to the tank, so the tilting angle of the pump 1.2 is controlled by the pilot hydraulic power sources 21 and 22. is held at an almost neutral position, fluid discharge is virtually zero, and a small amount of oil is removed from the bypass valve 2.
It returned to tank 23 after 4.25.
ポンプ１．２がそれぞれ単独にアクチュエータを駆動す
る場合：各切換弁群のいずれかの切換弁がそれぞれ切換
えられており、合流弁１１のパイロットポートＣ１１、
ＣＩ２のいずれにもパイロット油圧源２１．２２の油圧
は供給されないので、合流弁１１は中立位置にあり、従
って、ポンプ１．２の吐出流体は単独にこれらの７クチ
ユエータに供給され、合流することはない。なお、切換
弁５および切換弁８はそれぞれ一方の切換方向において
、単独制御位置と合流制御位置とを有しており、また他
方の切換方向において単独制御位置のみを有しているが
、この場合は単独制御位置をとることはいうまでもない
。When each of the pumps 1.2 independently drives an actuator: one of the switching valves in each switching valve group is switched, and the pilot port C11 of the merging valve 11,
Since the hydraulic pressure of the pilot hydraulic source 21.22 is not supplied to any of the CI2, the merging valve 11 is in the neutral position, so that the discharge fluid of the pump 1.2 is supplied independently to these 7 actuators and cannot be merged. There isn't. Note that the switching valve 5 and the switching valve 8 each have an independent control position and a merging control position in one switching direction, and only an independent control position in the other switching direction. Needless to say, takes the independent control position.
ポンプ１．２の吐出流体が合流する場合：例えば切換弁
５をパイロット弁がＡｂ位置をとるように切換え、アク
チュエータ９にポンプ１の流体が流入したとする。パイ
ロット油圧源２１の油圧はポートＡ１１から合流弁１１
のパイロットポートＣ１１に流入し、合流弁１１は中立
位置から図の左のシンボル位置へと切換えられ、第４の
ポートＣ４と第５のポートＣ５の通路が閉じてパイロッ
ト油圧源２２の圧力が上昇し、ポンプ２の吐出油量が増
加し、ポンプ１の吐出油量とチェック弁１３を通り合流
弁を経て供給されるポンプ２の吐出油ｍがシリンダ９の
ロンド側に合流して供給されることになる。When the fluids discharged from the pumps 1 and 2 merge: For example, assume that the switching valve 5 is switched so that the pilot valve takes the Ab position, and the fluid from the pump 1 flows into the actuator 9. The oil pressure of the pilot oil pressure source 21 is supplied from the port A11 to the merging valve 11.
flows into the pilot port C11, the merging valve 11 is switched from the neutral position to the symbol position on the left in the figure, the passages between the fourth port C4 and the fifth port C5 are closed, and the pressure of the pilot hydraulic source 22 increases. However, the amount of oil discharged from the pump 2 increases, and the amount of oil discharged from the pump 1 and the oil m delivered from the pump 2, which is supplied through the check valve 13 and the merging valve, merge and are supplied to the rond side of the cylinder 9. It turns out.
（ト） 発明の効果
以上述べたように本発明の２速合流回路によれば、合流
弁が１個で済むので、設置スペースは小さくてよく、ま
た、合流時にはショック等の不具合もなく低圧からスム
ーズに昇圧していくことができるので作業性もよくなり
、製器の寿命も延長することが可能になった。(G) Effects of the Invention As described above, according to the two-speed merging circuit of the present invention, only one merging valve is required, so the installation space is small, and there is no problem such as shock during merging, and the circuit can be operated from low pressure. Since the pressure can be increased smoothly, workability is improved and the life of the equipment can be extended.
第１図は本発明の２速合流回路の回路図であり、第２図
は従来の２速合流回路の回路図である。
１．２・・・ポンプ、３，４，５．６・・・切換弁、７
．８・・・（最下流側の）切換弁（Ａ、Ｂ）、９．１０
・・・（合流を必要とする）アクチュエータ、１１・・
・合流弁、１２．１３・・・チ −ニック弁、１４，
１５，１６．１７・・・アクチュエータ、２１．２２・
・・パイロット油圧源、２３・・・タンク、Ａ・・・（
一方のポンプの）最下流側の切換弁、Ｂ・・・（他方の
ポンプの）最下流側の切換弁、Ａ１．Ａ２．Ｂｌ、Ｂ２
・・・（切換弁の）ポート、Ａ１１．Ａ１２，８１１゜
８１２・・・（切換弁の）パイロットポート、Ｃ１、Ｃ
２，Ｃ３，Ｃ４，Ｃ５・・・（合流弁の）ポート、Ｃ１
１，Ｃ１２・・・（合流弁の）バイロットポート。
特許出願人 株式会社 日本製鋼所代表者 舘
野万古
第１図FIG. 1 is a circuit diagram of a two-speed merging circuit according to the present invention, and FIG. 2 is a circuit diagram of a conventional two-speed merging circuit. 1.2...Pump, 3,4,5.6...Switching valve, 7
．． 8... (most downstream side) switching valve (A, B), 9.10
...actuator (requiring merging), 11...
・Merge valve, 12.13... Chinic valve, 14,
15, 16.17... Actuator, 21.22.
... Pilot hydraulic power source, 23... Tank, A... (
The most downstream switching valve (of one pump), B...The most downstream switching valve (of the other pump), A1. A2. Bl, B2
... (switching valve) port, A11. A12, 811゜812... (switching valve) pilot port, C1, C
2, C3, C4, C5... (merging valve) port, C1
1, C12... (merging valve) pilot port. Patent applicant: Japan Steel Works, Ltd. Representative: Manko Tateno Figure 1
Claims (1)
の複数のアクチユエータと、各ポンプと各アクチュエー
タとの間に設けられパイロット弁を有する複数の切換弁
とを備える建設機械等の油圧回路において、一方のポン
プの最下流側の切換弁Ａと、他方のポンプの最下流側の
切換弁Ｂとの間に１個の合流弁を設け、この合流弁は５
個のポートを有する３位置切換弁とすると共に、合流弁
の第１ポートと切換弁Ａの第１ポート、合流弁の第２ポ
ートと切換弁Ｂの第１ポートとをそれぞれ接続し、合流
弁の第３ポートと２個のポンプの吐出管路とをそれぞれ
チエック弁を介して接続し、合流弁の第４ポートと切換
弁Ａの第２パイロットポート及び切換弁Ｂの第２パイロ
ットポートとをそれぞれ接続し、合流弁の第５ポートと
タンクとを接続し、かつ中立位置において合流弁の第４
ポートと合流弁の第５ポートとを連通する一方、合流弁
の一方のパイロットポートは切換弁Ａの中立時にこのバ
イロツト弁の第１パイロットポートを経てタンクに連通
し、合流弁の他方のパイロツトポートは切換弁Ｂの中立
時にこのパイロット弁の第１パイロツトポートを経てタ
ンクに連通するように構成したことを特徴とする２速合
流回路。In a hydraulic circuit of a construction machine, etc., comprising two pumps, two groups of actuators controlled by each pump, and a plurality of switching valves each having a pilot valve and provided between each pump and each actuator. , one merging valve is provided between the most downstream switching valve A of one pump and the most downstream switching valve B of the other pump.
The first port of the merging valve is connected to the first port of switching valve A, and the second port of the merging valve is connected to the first port of switching valve B. The third port of the merging valve is connected to the discharge pipes of the two pumps through check valves, and the fourth port of the merging valve is connected to the second pilot port of the switching valve A and the second pilot port of the switching valve B. the 5th port of the merging valve and the tank, and the 4th port of the merging valve in the neutral position.
The port communicates with the fifth port of the merging valve, while one pilot port of the merging valve communicates with the tank via the first pilot port of this pilot valve when switching valve A is in neutral, and the other pilot port of the merging valve communicates with the tank through the first pilot port of this pilot valve. 2 is a two-speed merging circuit characterized in that it is configured to communicate with a tank through the first pilot port of the pilot valve when the switching valve B is in the neutral state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23511884A JPS61116103A (en) | 1984-11-09 | 1984-11-09 | Two-speed converging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23511884A JPS61116103A (en) | 1984-11-09 | 1984-11-09 | Two-speed converging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61116103A true JPS61116103A (en) | 1986-06-03 |
Family
ID=16981320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23511884A Pending JPS61116103A (en) | 1984-11-09 | 1984-11-09 | Two-speed converging circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61116103A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6421204A (en) * | 1987-07-10 | 1989-01-24 | Kayaba Industry Co Ltd | Controlling circuit for vehicle |
| EP0709578A3 (en) * | 1994-10-29 | 1998-06-17 | Samsung Heavy Industries Co., Ltd | Actuator operating signal sensor |
| WO2021228437A1 (en) * | 2020-05-15 | 2021-11-18 | Eaton Intelligent Power Limited | Hydraulic system valve control |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4846769A (en) * | 1971-10-20 | 1973-07-03 | ||
| JPS5624124A (en) * | 1979-08-06 | 1981-03-07 | Otsuka Chem Co Ltd | Sheet composite for manufacture of noncombustible compound material and manufacture for noncombustible compound material |
-
1984
- 1984-11-09 JP JP23511884A patent/JPS61116103A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4846769A (en) * | 1971-10-20 | 1973-07-03 | ||
| JPS5624124A (en) * | 1979-08-06 | 1981-03-07 | Otsuka Chem Co Ltd | Sheet composite for manufacture of noncombustible compound material and manufacture for noncombustible compound material |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6421204A (en) * | 1987-07-10 | 1989-01-24 | Kayaba Industry Co Ltd | Controlling circuit for vehicle |
| EP0709578A3 (en) * | 1994-10-29 | 1998-06-17 | Samsung Heavy Industries Co., Ltd | Actuator operating signal sensor |
| WO2021228437A1 (en) * | 2020-05-15 | 2021-11-18 | Eaton Intelligent Power Limited | Hydraulic system valve control |
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