JPS6030735A - Oil-pressure circuit for oil-pressure shovel - Google Patents
Oil-pressure circuit for oil-pressure shovelInfo
- Publication number
- JPS6030735A JPS6030735A JP58138789A JP13878983A JPS6030735A JP S6030735 A JPS6030735 A JP S6030735A JP 58138789 A JP58138789 A JP 58138789A JP 13878983 A JP13878983 A JP 13878983A JP S6030735 A JPS6030735 A JP S6030735A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- oil
- hydraulic pump
- pressure
- oil passage
- 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.)
- Granted
Links
Classifications
-
- 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
- E02F9/2278—Hydraulic circuits
- E02F9/2292—Systems with two or more pumps
-
- 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
- E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は複数のアクチュエータを有する油圧ショベル
の油圧回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic circuit for a hydraulic excavator having a plurality of actuators.
油圧ショベルはその操作性の向上、および、コストダウ
ンの要求が非常に強いが、操作性の向上を計ると油圧回
路が複雑になり、コストアップとなり、コストダウンを
計ろうとすればとうしても操作性その他の面でマイナス
の要素がでてくる。There is a strong demand for improved operability and cost reduction for hydraulic excavators, but improving operability complicates the hydraulic circuit and increases costs. Negative factors emerge in terms of gender and other aspects.
また、最近では走行モータと他のアクチュエータを同時
に使用する場合、すなはち、走行中にブーム、アームを
使用する場合で、例えば、坂道を上る場合にブーム、ア
ームを補助的に使用して上りやすくする場合、あるいは
、湿地帯で走行体がぬかるみにはまり込んだときに、ブ
ーム、アームを補助的に使用してぬかるみから脱出しよ
うとする場合に、走行モータと他のアクチュエータとの
油圧回路の接続の状況によって片側の走行モータにのみ
多毒の油が流れて機体が蛇行するという好ましからぬ現
象が生ずる。Also, recently, when the travel motor and other actuators are used at the same time, that is, when the boom and arm are used while traveling, for example, when going up a slope, the boom and arm are used auxiliary. The hydraulic circuit between the travel motor and other actuators may be Depending on the connection, highly toxic oil may flow to only one drive motor, causing the aircraft to meander, an undesirable phenomenon.
また、ブーム、アーム等はその作動時にある程度の速度
が要求される。そのためには供給する油量が多くなけれ
ばならず、従来からポンプ数を増加したり、あるいは、
切換弁数を増加して複数の切換弁から１個のアクチュエ
ータへ合流回路を形成し、切換弁を同時に操作して複数
のポンプから合流して圧油を供給する如くしていたが、
回路が複雑になり、切換弁を増加するためにコストの上
昇になり、必ずしも好ましい方法ではなかった。Additionally, booms, arms, and the like require a certain degree of speed when operating. To achieve this, it is necessary to supply a large amount of oil, which requires increasing the number of pumps, or
Previously, the number of switching valves was increased to form a confluence circuit from multiple switching valves to one actuator, and the switching valves were operated simultaneously to merge from multiple pumps and supply pressure oil.
This is not necessarily a desirable method because the circuit is complicated and the number of switching valves is increased, leading to an increase in cost.
この発明は上記の問題に対処するために発明されたもの
で、その目的は簡単な回路で旋回優先、走行直進、走行
モータとブーム、アームの同時操作という複合操作を可
能とするものであり、また、各アクチュエータを操作す
る切換弁を、各アクチ、エータに対して１個でよく、ま
た、切換弁自体を簡単な構造としコストダウンを計れる
ようにするものである。This invention was invented in order to address the above problems, and its purpose is to enable multiple operations such as turning priority, straight forward travel, and simultaneous operation of the travel motor, boom, and arm using a simple circuit. Further, only one switching valve is required for each actuator and each actuator, and the switching valve itself has a simple structure to reduce costs.
この発明の構成は、油圧ショベルのアクチュエータを２
個のグループに分け、各々別個の油圧ポンプで作動する
如くし、各油圧ポンプの最上流側に開閉弁を設け、開閉
弁の下流側からそのグループのアクチーエータ操作用切
換弁に並列に接続し、同時にまた、開閉弁の下流側から
他のグループのアクチーエータ操作用切換弁の中の１つ
に合流用の油路を設けており、また、左右の走行モータ
操作用切換弁は互いに油路で連結し、これに開閉弁を設
け、かつ、旋回モータを有す側のグループの走行モータ
操作用切換弁の並列油路にプロ、り弁を設け、該弁を旋
回モータ回路からのパイロ、ト圧で制御する如く構成し
たものである。The configuration of this invention is that the actuator of the hydraulic excavator is
Each hydraulic pump is divided into groups, each operated by a separate hydraulic pump, an on-off valve is provided on the most upstream side of each hydraulic pump, and the downstream side of the on-off valve is connected in parallel to the switching valve for operating the actuator of the group, At the same time, an oil passage is provided for merging from the downstream side of the on-off valve to one of the actuator operation switching valves of the other group, and the left and right travel motor operation switching valves are connected to each other by an oil passage. This is equipped with an on-off valve, and a professional valve is installed in the parallel oil passage of the switching valve for operating the travel motor of the group with the swing motor, and the valve is connected to the pyro-pressure from the swing motor circuit. It is configured so that it can be controlled by.
旋回中にアームを操作しても、旋回モータとアームシリ
ンダがそれぞれ別個の油圧ポンプで作動されるので、他
の影響を全くうけない。また、走行中に他のアクチーエ
ータを作動しても、走行モータが他のアクチュエータの
影響を受けないので蛇行することがない。また、ブーム
、および、アームの合流回路には切換弁が１個でよいた
め、コストの低減になる。また、センターバイパス回路
かないため、切換弁自体を小型にすることができるので
コストの低減になる。また、各アクチュエータともに、
単独操作の際には２個の油圧ポンプから合流して油を供
給できるので、ポンプをＮ 効に使用することができる
等の幾多の利益がある。Even if the arm is operated during swinging, the swing motor and arm cylinder are operated by separate hydraulic pumps, so there is no influence from other operations. Furthermore, even if other actuators are activated while the vehicle is running, the travel motor will not be affected by the other actuators, so it will not meander. Further, since only one switching valve is required for the boom and arm merging circuit, costs are reduced. Furthermore, since there is no center bypass circuit, the switching valve itself can be made smaller, resulting in cost reduction. In addition, for each actuator,
When operated independently, oil can be supplied from two hydraulic pumps by merging, which has many benefits such as the ability to use the pumps for N effect.
以下、この発明の実施例を図面に基づいて詳細に説明す
る。Hereinafter, embodiments of the present invention will be described in detail based on the drawings.
本発明は油圧ショベルのアクチュエータを旋回モータ１
、ブームシリンダ２、左走行モータ３を１グループとし
、これを第１油圧ポンプ４で駆動する如＜シ、右走行モ
ータ５、アームシリンダ６、バケットシリンダ７を１グ
ループとし、これヲ第２油圧ポンプ８で駆動する如くし
たものであるが、第１油圧ポンプ４の吐出側油路９には
開閉弁１０を設け、その下流側油路１１には旋回子−タ
１作動用の切換弁１２を油路１３により、ブームシリン
ダ２作動用の切換弁１４を油路１５により、左走行用モ
ータ３作動用の切換弁１６を油路１７によりそれぞれ並
列に連結している。切換弁１４に通ずる油路１５にはチ
ェック弁１８を、切換弁１６に通ずる油路１７にはブロ
ック弁１９・および、そのバイパス油路２ｏにはチェッ
ク弁２１を設けているか、該プロ、り弁１９には切換弁
１２がら旋回モータ］に通ずる油路２２がらパイロ、ト
油路２３が通じており、旋回モータ１が作動するときは
パイロ、ト圧により該プロ、り弁１９を閉じる如くして
いる。The present invention uses a swing motor 1 as an actuator for a hydraulic excavator.
, the boom cylinder 2 and the left travel motor 3 are set as one group, and this is driven by the first hydraulic pump 4. The pump 8 is driven by a pump 8, and an on-off valve 10 is provided in the discharge oil passage 9 of the first hydraulic pump 4, and a switching valve 12 for operating the swivel rotor 1 is provided in the downstream oil passage 11. are connected in parallel by an oil passage 13, a switching valve 14 for operating the boom cylinder 2 by an oil passage 15, and a switching valve 16 for operating the left travel motor 3 by an oil passage 17, respectively. Is the oil passage 15 leading to the switching valve 14 equipped with a check valve 18, the oil passage 17 leading to the switching valve 16 equipped with a block valve 19, and the bypass oil passage 2o equipped with a check valve 21? An oil passage 22 and a pyro oil passage 23, which lead from the switching valve 12 to the swing motor, are connected to the valve 19, and when the swing motor 1 is operated, the valve 19 is closed by the pyro pressure. are doing.
同様に、第２油圧ポンプ８の吐出側油路２５には開閉弁
２６を設け、その下流側油路２７には右走行モータ５操
作用の切換弁２８を油路２９により、アームシリンダ６
操作用の切換弁３０を油路３］により、バケ、トシリン
ダ７操作用の切換弁３２を油路３３によりそれぞれ並列
に連結しており、油路２９にはチェ、り弁３４を、油路
３］にはチェ、り弁３５を、油路３３にはチェ、り弁３
６をそれぞれ設けている。右走行モータ３操作用の切換
弁２８の流入口部、すなはち、チェック弁３４の下流側
と人定行モータ３操作用の切換弁１６の流入口部、すな
はち、プロ、り弁１９の下流側とは油路３７で連結して
おり、該油路３７にはこれを断続できる開閉弁３８を設
けている。また、」−配油路３７とバケ、トシリング７
操作用の切換弁３２の流入口部、ずなはち、チェック弁
３６の下流側は油路３９で連結している。４０は第２油
圧ポンプ８からブームシリンダ２へ合流して圧油を供給
するための油路で、開閉弁２６の下流側の油路２７から
切換弁１４の流入口部、すなはち、チェック弁１８の下
流側で油路１５に通じているが、該油路４０にはチェ、
り弁４１を設けている。Similarly, an on-off valve 26 is provided in the discharge side oil passage 25 of the second hydraulic pump 8, and a switching valve 28 for operating the right travel motor 5 is provided in the downstream oil passage 27 of the second hydraulic pump 8.
A switching valve 30 for operating the bucket and a switching valve 32 for operating the cylinder 7 are connected in parallel by an oil passage 33 through an oil passage 3, and a check valve 34 is connected to the oil passage 29, 3], the check valve 35 is installed, and the oil path 33 is the check valve 3.
6 are provided for each. The inlet part of the switching valve 28 for operating the right travel motor 3, that is, the downstream side of the check valve 34, and the inlet part of the switching valve 16 for operating the human travel motor 3, that is, the downstream side of the check valve 34. The oil passage 37 is connected to the downstream side of the oil passage 19, and the oil passage 37 is provided with an on-off valve 38 that can open and close it. Also,” - oil distribution route 37 and bucket, toshi ring 7
The inlet portion of the operation switching valve 32 and the downstream side of the check valve 36 are connected by an oil passage 39. Reference numeral 40 denotes an oil passage for supplying pressure oil by merging from the second hydraulic pump 8 to the boom cylinder 2, from the oil passage 27 on the downstream side of the on-off valve 26 to the inlet portion of the switching valve 14, that is, the check valve. The downstream side of the valve 18 communicates with the oil passage 15, but the oil passage 40 has a check,
A valve 41 is provided.
４２は第１油圧ポンプ４側からアームシリンダ６へ合流
用の圧油を供給する油路で、開閉弁１０の下流側の油路
１１からアームシリンダ６操作用の切換弁３０の流入口
部、すなはち、チェ、り弁３５の下流側で油路３１に通
じているが、該油路４２には油路１］−の近くに絞り４
３を、また、油路３１の近くにチェ、り弁４４を設けて
いる。42 is an oil passage that supplies pressure oil for merging from the first hydraulic pump 4 side to the arm cylinder 6, and an inlet portion of the switching valve 30 for operating the arm cylinder 6 from the oil passage 11 on the downstream side of the on-off valve 10; In other words, the oil passage 42 is connected to the oil passage 31 on the downstream side of the valve 35, but the oil passage 42 has a throttle 4 near the oil passage 1.
In addition, a check valve 44 is provided near the oil passage 31.
なお、第１油圧ポンプ４の吐出側油路９に設けた開閉弁
１０ ％および、第２油圧ポンプ８の吐出側油路２５に
設けた開閉弁２６は、すべてのアクチュエータの切換弁
１２．１４．１６．２８．３ｏ１３２と連動しており、
これらの切換弁１２．１４．１６．２８．３０．３２の
いずれか１つでも操作したときのみ開通し、全く操作し
ないときは油圧ポンプ４．８の油をタンク２４に帰す如
くしている。Note that the on-off valve 10% provided in the discharge side oil passage 9 of the first hydraulic pump 4 and the on-off valve 26 provided on the discharge side oil passage 25 of the second hydraulic pump 8 are the switching valves 12 and 14 of all actuators. .16.28.3o132 is linked,
The switching valves 12, 14, 16, 28, 30, 32 are opened only when any one of them is operated, and the oil from the hydraulic pump 4.8 is returned to the tank 24 when no operation is performed.
また、４５はシャ、トル弁である。Further, 45 is a shuttle valve.
本発明は上記の如く構成しているが、次にその作動状況
について説明する。The present invention is constructed as described above, and the operating conditions thereof will now be explained.
先づ、アクチーエータが全く作動されない場合、すなは
ち、無負荷時は、切換弁は全く操作されないので、切換
弁１２．１４．１６．２８．３０゜３２と連動した開閉
弁１０．２６は操作されず、タンク２４側に通じており
、第１油圧ポンプ４の油は該開閉弁１０を通ってタンク
２４に帰り、同様に第２油圧ポンプ８の油は開閉弁２６
を通ってタンク２４に帰る。First, when the actuator is not operated at all, that is, when there is no load, the switching valve is not operated at all, so the on-off valve 10.26 linked to the switching valve 12.14.16.28.30°32 is not operated. The oil from the first hydraulic pump 4 returns to the tank 24 through the on-off valve 10, and the oil from the second hydraulic pump 8 passes through the on-off valve 26.
Pass through and return to tank 24.
次に、アクチュエータ作動時、すなはち、切換弁１２．
１４．１６．２８．３０．３２のいずれか１つでも操作
された場合は、これらの切換弁１２．１４．１６．２８
．３０．３２と開閉弁１０．２６が連動しているから該
開閉弁１０，２６は切換わり、第１、第２両油圧ポンプ
４．８の油はタンク２４へは流れず、いずれか操作され
た切換弁へ流しる。この場合、先づ、いずれかの切換弁
の中で１個の切換弁を操作した場合、すなＧまち、単独
操作の場合について説明する。Next, when the actuator is activated, that is, the switching valve 12.
If any one of 14.16.28.30.32 is operated, these switching valves 12.14.16.28
．． 30.32 and the on-off valve 10.26 are interlocked, so the on-off valves 10 and 26 are switched, and the oil in both the first and second hydraulic pumps 4.8 does not flow to the tank 24, but when either one is operated. flow to the switching valve. In this case, first, a case where one of the switching valves is operated, that is, a single operation will be explained.
例えば、旋回モータｌ操作用の切換弁１２を操作ずれば
、第１油圧ポンプ４からの圧油は開閉弁１０、切換弁１
２を通って旋回モータ１に流れる。For example, if the switching valve 12 for operating the swing motor l is operated, the pressure oil from the first hydraulic pump 4 is transferred to the on-off valve 10 and the switching valve 1.
2 to the swing motor 1.
同時に第２油圧ポンプ８からの圧油が開閉弁２６、チェ
、り弁３４、開閉弁３８、チェック弁２１を経て第１油
圧ポンプ４からの油と合流するから、旋回モータ１には
両袖圧ポンプ４．８の圧油が合流して作用することにな
る。At the same time, the pressure oil from the second hydraulic pump 8 passes through the on-off valve 26, the check valve 34, the on-off valve 38, and the check valve 21, and joins the oil from the first hydraulic pump 4. The pressure oils of the pressure pumps 4.8 will join together and act.
次に、ブームシリンダ２操作用の切換弁１４を操作した
場合は、第１油圧ポンプ４からの圧油は開閉弁１０、チ
ェック弁１８、切換弁１４を通ってブームシリンダ２に
流れるが、同時に第２油圧ポンプ８からの圧油が、開閉
弁２６から合流用の油路４０、チェック弁４１を通って
切換弁１４に流れるから１ブームシリンダ２には両袖圧
ポンプ４．８の圧油が合流して作用することになる。Next, when the switching valve 14 for operating the boom cylinder 2 is operated, the pressure oil from the first hydraulic pump 4 flows to the boom cylinder 2 through the on-off valve 10, the check valve 18, and the switching valve 14, but at the same time Pressure oil from the second hydraulic pump 8 flows from the on-off valve 26 to the switching valve 14 through the merging oil passage 40 and the check valve 41. will come together and work together.
次に、人定行モータ３操作用の切換弁１６を操作した場
合は、プロ、り弁１９が旋回モータ１を作動しないので
パイロット油路２３からのパイロット油が作用せず開通
しているので・第１油圧ポンプ４からの圧油は開閉弁１
０、プロ、り弁１９、切換弁１６を通って左走行モータ
３に流れる。同時に第２油圧ポンプ８からの圧油は開閉
弁２６、チェック弁３４、開閉弁３８を通って第１油圧
ポンプ４の圧油と合流して切換弁１６に流れるから、左
走行モータ３は両袖圧ポンプ４．８の圧油が合流して作
用することになる。Next, when the switching valve 16 for operating the motor 3 is operated, the valve 19 does not operate the swing motor 1, so the pilot oil from the pilot oil passage 23 does not act and is open.・Pressure oil from the first hydraulic pump 4 is supplied to the on-off valve 1
0, the flow passes through the valve 19 and the switching valve 16 to the left travel motor 3. At the same time, the pressure oil from the second hydraulic pump 8 passes through the on-off valve 26, the check valve 34, and the on-off valve 38, merges with the pressure oil of the first hydraulic pump 4, and flows to the switching valve 16, so that the left travel motor 3 The pressure oils of the sleeve pressure pumps 4.8 will join together and act.
次に、右走行モータ５操作用の切換弁２８を操作した場
合は、第２油圧ポンプ８からの圧油は開閉弁２６、チェ
ック弁３４、切換弁２８を通って右走行モータ５に流れ
る。同時に第１油圧ポンプ４からの圧油が、開閉弁１０
、プロ、り弁１９、開閉弁３８を通って切換弁２８に達
し、第２油圧ポンプ８の圧油と合流するから、右走行モ
ータ５は両油圧ポンプ４．８の圧油が合流して作用する
ことになる。Next, when the switching valve 28 for operating the right travel motor 5 is operated, the pressure oil from the second hydraulic pump 8 flows to the right travel motor 5 through the on-off valve 26, the check valve 34, and the switching valve 28. At the same time, pressure oil from the first hydraulic pump 4 is supplied to the on-off valve 10.
, the valve 19 passes through the on-off valve 38 and reaches the switching valve 28, where it merges with the pressure oil of the second hydraulic pump 8. Therefore, the right travel motor 5 is operated by the pressure oil of both hydraulic pumps 4 and 8. It will work.
次に、アームシリンダ６操作用の切換弁３０を操作した
場合は、第２油圧ポンプ８からの圧油は開閉弁２６、チ
ェック弁３５、切換弁３０を通ってアームシリンダ６に
流れる。同時に第１油圧ポンプ４からの圧油は開閉弁１
０、合流用の油路４２にある絞り４３、チェ、り弁４４
を通って切換弁３６ ｋ−達Ｌ／、第２油圧ポンプ８の
圧油と合流すルカラ、アームシリンダ６は両油圧ボンフ
４．８で作動される。Next, when the switching valve 30 for operating the arm cylinder 6 is operated, the pressure oil from the second hydraulic pump 8 flows to the arm cylinder 6 through the on-off valve 26, the check valve 35, and the switching valve 30. At the same time, the pressure oil from the first hydraulic pump 4 is supplied to the on-off valve 1.
0, throttle 43, check valve 44 in the merging oil path 42
The arm cylinder 6 is operated by both hydraulic pumps 4.8 through which the switching valve 36 k-t L/ is joined with the pressure oil of the second hydraulic pump 8.
次に、バケ、トシリンダ７操作用の切換弁３２を操作し
た場合は、第２油圧ポンプ８からの圧油は開閉弁２６、
チェック弁３６、切換弁３２を通ってパケットシリンダ
７に流れる。同時に第１ ＮＯ圧ポンプ４からの圧油は
開閉弁１０、ブロック弁１９、開閉弁３８、更に油路３
９を通って切換弁３２に達し、第２油圧ポンプ８の圧油
と合流するから、パケットシリンダ７は両油圧ポンプ４
．８で作動される。このようにアクチュエータを単独で
作動する場合はいずれの場合でもその作動するアクチュ
エータに両方の油圧ポンプ４．８から圧油が供給される
。Next, when the switching valve 32 for operating the bucket and cylinder 7 is operated, the pressure oil from the second hydraulic pump 8 is transferred to the on-off valve 26,
It flows into the packet cylinder 7 through the check valve 36 and the switching valve 32. At the same time, the pressure oil from the first NO pressure pump 4 is transferred to the on-off valve 10, the block valve 19, the on-off valve 38, and further to the oil line 3.
9 to reach the switching valve 32 and merge with the pressure oil of the second hydraulic pump 8, so the packet cylinder 7 is connected to both hydraulic pumps 4.
．． It is activated at 8. In any case where an actuator is operated independently in this way, pressure oil is supplied to the operated actuator from both hydraulic pumps 4.8.
以」二はアクチュエータを単独で作動する場合であるが
、次に、二個以上同時に作動する複合操作の場合につい
て述べる。The following is a case in which the actuator is actuated singly, but next we will discuss the case of a complex operation in which two or more actuators are actuated at the same time.
先ツ、旋回モータ１とアームシリンダ６を同時に作動す
る場合は、切換弁１２と切換弁３０を操作する。切換弁
１２の操作で第１油圧ポンプ４からの圧油は前にも述べ
たように旋回モータ１に流れるが、同時に切換弁３０が
操作されるので、第２油圧ポンプ８の油は該切換弁３０
を通ってアームシリンダ６に流れ、旋回モータ１は第１
油圧ポンプ４からの圧油で、アームシリンダ６は第２油
圧ポンプ８からの圧油で作動される。First, when operating the swing motor 1 and the arm cylinder 6 at the same time, the switching valve 12 and the switching valve 30 are operated. When the switching valve 12 is operated, the pressure oil from the first hydraulic pump 4 flows to the swing motor 1 as described above, but since the switching valve 30 is operated at the same time, the oil from the second hydraulic pump 8 flows through the switching valve 12. valve 30
through the arm cylinder 6, and the swing motor 1
The arm cylinder 6 is operated with pressure oil from the hydraulic pump 4 and the pressure oil from the second hydraulic pump 8.
次に、旋回モータｌと左右の走行モータ３．５を同時に
作動する場合は、切換弁１２と切換弁１６．２８を操作
する。切換弁１２の操作により第１油圧ポンプ４からの
圧油が旋回モータ１に流れてこれを作動するが、該旋回
モータ１作動時はパイロ、ト油路２３からのパイロ、ト
圧でプロ、り弁１９が閉鎖され、かつ、チェ、り弁２１
があるので第１油圧ポンプ４の油が該弁１９を通って流
れることはない。同時に操作された切換弁１６・２８の
操作により、第２油圧ポンプ８からの圧油が右走行モー
タ５のみならず、開閉弁３８を通って左走行モータ３に
も流れ、両走行モータ３．５は第２油圧ポンプ８からの
圧油で作動される。このように旋回モータ１は第１油圧
ポンプ４で作動され、走行モータ３．５は第２油圧ポン
プ８で作動されるから、両アクチ＝エータは他のアクチ
ーエータの影響を受けることなく作動することができる
。Next, when operating the swing motor 1 and the left and right travel motors 3.5 simultaneously, the switching valve 12 and the switching valve 16.28 are operated. By operating the switching valve 12, pressure oil from the first hydraulic pump 4 flows to the swing motor 1 and operates it. The valve 19 is closed, and the valve 21 is closed.
Therefore, the oil of the first hydraulic pump 4 does not flow through the valve 19. By simultaneously operating the switching valves 16 and 28, the pressure oil from the second hydraulic pump 8 flows not only to the right travel motor 5 but also to the left travel motor 3 through the on-off valve 38, causing both travel motors 3. 5 is operated with pressure oil from a second hydraulic pump 8. In this way, since the swing motor 1 is operated by the first hydraulic pump 4 and the travel motor 3.5 is operated by the second hydraulic pump 8, both actuators operate without being influenced by other actuators. Can be done.
また、本図ではプロ、り弁１９は旋回モータ回路からの
パイロ、ト圧で切換るようになっているが、これは、旋
回モータ用切換弁１２の操作レバーと連結、あるいは、
切換弁１２の操作用リモコンパイロット圧により切換る
ようにしてもよい。In addition, in this figure, the switching valve 19 is switched by the pyrostatic pressure from the swing motor circuit, but this is connected to the operating lever of the switching valve 12 for the swing motor, or
The switching may be performed using remote control pilot pressure for operating the switching valve 12.
次に、走行モータ３．５とブームシリンダ２、アームシ
リンダ６、パケットシリンダ７を同時に作動する場合は
、切換弁１６．２８、および、切換弁１４．２８を操作
する。旋回モータ１が作動しないのでブロック弁１９は
開通しており、勿論開閉弁３８も開通しているから、切
換弁１４．１６が第１油圧ポンプ４に通ずるのみならず
、切換弁２８も油路３７を通じて、切換弁３２も更に油
路３９を通じて、また、切換弁３ｏは油路４２を通じて
、いずれも第１油圧ポンプ４に通ずる。第２油圧ポンプ
８の場合も同様で、切換弁２８．３０．３２が第１油圧
ポンプ８に通ずるのみならず、切換弁１６が油路３７を
通じて、切換弁１４が油路４０を通じてそれぞれ連通し
ている。したがって、これらの切換弁１４．１６．２８
．３０．３２は第１油圧ポンプ４、第２油圧ポンプ８に
互いに通じ合っており、その操作によりこれらの切換弁
に通ずるアクチュエータを平等に作動することができる
。Next, when operating the travel motor 3.5, boom cylinder 2, arm cylinder 6, and packet cylinder 7 simultaneously, the switching valves 16.28 and 14.28 are operated. Since the swing motor 1 does not operate, the block valve 19 is open, and of course the on-off valve 38 is also open, so not only the switching valves 14 and 16 communicate with the first hydraulic pump 4, but also the switching valve 28 is connected to the oil path. 37, the switching valve 32 also communicates with the first hydraulic pump 4 through an oil passage 39, and the switching valve 3o further communicates with the first hydraulic pump 4 through an oil passage 42. The same applies to the second hydraulic pump 8, in which not only the switching valves 28, 30, and 32 communicate with the first hydraulic pump 8, but also the switching valve 16 and the switching valve 14 communicate with each other through an oil passage 37 and an oil passage 40, respectively. ing. Therefore, these switching valves 14.16.28
．． 30 and 32 communicate with the first hydraulic pump 4 and the second hydraulic pump 8, and by operating them, the actuators communicating with these switching valves can be operated equally.
次に、傾斜地を斜に飛行する場合、あるいは、泥滓地か
ら脱出する場合等で、左右の走行モータ３．５に負荷に
差異が生じた場合は、左右の走行モータ３．５を結ぶ油
路３・７が連通していれば、負荷の小さい側の走行モー
タに多くの油が流れて走行がアンバランスになる。この
ような場合は開閉弁３８を操作してこれを閉鎖する。左
右の走行モータ３．５の関係が切れ、左走行モータ３は
第１油圧ポンプ４で作動され、右走行モータ５は第２油
圧ポンプ８で作動されることになるから、左右の走行モ
ータ３．５に負荷の差があっても何らの影響も受けるこ
となく作動することができる。Next, if there is a difference in the load on the left and right drive motors 3.5 when flying diagonally on a slope or when escaping from a muddy area, use the oil that connects the left and right drive motors 3.5. If paths 3 and 7 are in communication, more oil will flow to the drive motor with the smaller load, resulting in unbalanced running. In such a case, the on-off valve 38 is operated to close it. The relationship between the left and right travel motors 3.5 is broken, the left travel motor 3 is operated by the first hydraulic pump 4, and the right travel motor 5 is operated by the second hydraulic pump 8, so that the left and right travel motors 3. Even if there is a difference in load between .5 and 5, it can operate without any influence.
以上述べたように本発明は油圧ショベルのアクチュエー
タを作動する切換弁を２個のグループに分け、それぞれ
別個の油圧ポンプで作動する如くし、各グループの切換
弁は最上流側に設けた開閉弁の下流側から互いに並列に
連結し、その中で左右の走行モータ操作用の切換弁の流
入側は互いに油路で連結し、該油路に開閉弁を設け、ま
た、第１油圧ポンプ側の油路には旋回モータ回路からの
パイロット油圧で作動するブロック弁を設け、かつ、ア
ルムシリンダ操作用の切換弁とブームシリンダ操作用の
切換弁へは他グループの油圧ポンプから合流用の油路を
導びいたから、旋回モータとアームシリンダの同時操作
時には各々別個の油圧ポンプで作動され、他のアクチー
エータの影響を受けないから作動が確実である。また、
走行モータとブームシリンダを同時に作動した場合でも
、走行モータは一方の油圧ポンプから、ブームシリンダ
は他方の油圧ポンプから油を供給されるので、走行モー
タが他のアクチュエータの影響を受けることがなく、蛇
行その他の悪い現象は生じない。As described above, the present invention divides the switching valves that operate the actuators of a hydraulic excavator into two groups, each of which is operated by a separate hydraulic pump, and each group's switching valve is an on-off valve provided on the most upstream side. The inlet sides of the switching valves for operating the left and right travel motors are connected to each other in parallel from the downstream side, and the inflow sides of the switching valves for operating the left and right travel motors are connected to each other by an oil path, and an on-off valve is provided in the oil path. The oil passage is equipped with a block valve operated by pilot oil pressure from the swing motor circuit, and the switching valve for operating the arm cylinder and the switching valve for operating the boom cylinder are connected to a merging oil passage from the hydraulic pump of another group. Therefore, when the swing motor and arm cylinder are operated simultaneously, each is operated by a separate hydraulic pump, and the operation is reliable because it is not affected by other actuators. Also,
Even when the travel motor and boom cylinder are operated at the same time, the travel motor is supplied with oil from one hydraulic pump and the boom cylinder is supplied with oil from the other hydraulic pump, so the travel motor is not affected by other actuators. No meandering or other bad phenomena occur.
また、ブームシリンダ、アームシリンダは一方の油圧ポ
ンプのみならず他方の油圧ポンプにも合流用の油路が通
じているから、従来の如く合流用として別個に切換弁を
設置する必要がなく、コストを減少することができる。In addition, since the boom cylinder and arm cylinder have a merging oil path that communicates not only with one hydraulic pump but also with the other hydraulic pump, there is no need to install a separate switching valve for merging as in the past, reducing costs. can be reduced.
また、センターバイパス回路がないので、切換弁自体を
小さくすることができるのでコスト減少することができ
る。また、各アクチュエータは単独操作の場合は２個の
油圧ポンプから合流して油の供給を受けるので、油圧ポ
ンプを有効に使用することができる。Furthermore, since there is no center bypass circuit, the switching valve itself can be made smaller, resulting in cost reduction. Furthermore, when each actuator is operated independently, it receives oil from two hydraulic pumps that merge together, so the hydraulic pumps can be used effectively.
第１図は本発明の実施例の油圧回路図である。
１−ｍ−旋回モータ １４−−一切換弁２−−−ブーム
シリンダ １５−−−ｐ３−一一人定行千−タ １９−
一一ブロック弁４−−−第１油圧ポンプ ２３−−−パ
イロッｌ路５−−−右走行モータ ２６−−−開閉弁６
−−−アームシリンダ ３７−−−泊路７−ｍ−パケツ
トシリンダ ３ａ−−−ｆＪ１％’Ｕ’Ｐ８−一一第２
油圧ポンプ ４ｏ−−一油路１０−−−開閉弁 ４２−
−− ｔｔ
１２−ｍ−切換弁
以上
特許出願人
油谷重工株式会社
代表者村田三佐男FIG. 1 is a hydraulic circuit diagram of an embodiment of the present invention. 1-m-Swivel motor 14--All changeover valve 2--Boom cylinder 15--P3-Each one constant line 19-
11 Block valve 4 --- First hydraulic pump 23 --- Pilot path 5 --- Right travel motor 26 --- Open/close valve 6
--- Arm cylinder 37 --- Night road 7-m- Packet cylinder 3a --- fJ1%'U'P8-11 2nd
Hydraulic pump 4o--oil passage 10--opening/closing valve 42-
-- tt 12-m-switching valve and above Patent applicant Misao Murata Representative of Yuya Heavy Industries Co., Ltd.
Claims (2)
作用切換弁を２個のグループに分け、それぞれ別個の油
圧ポンプで作動する如き油圧装置において、各油圧ポン
プの吐出側油路に開閉弁を設け、その下流側にそのグル
ープのアクチュエータ操作部に連通ずる油路を設け、左
右の走行モータ操作用切換弁は互いに流入口部を油路で
連結し、該油路に開閉弁を設けると共に、旋回モータを
有する側のグループの走行モータの並列油路にハプロ。 り弁を設けたことを特徴とする油圧ショベルの油圧回路
。(1) In a hydraulic system in which the actuator of a hydraulic excavator and its operation switching valve are divided into two groups, and each group is operated by a separate hydraulic pump, an on-off valve is provided in the oil passage on the discharge side of each hydraulic pump, An oil passage communicating with the actuator operation section of the group is provided on the downstream side, and the inlet ports of the left and right travel motor operation switching valves are connected to each other by an oil passage, and an on-off valve is provided in the oil passage. Haplo into the parallel oil path of the traveling motor of the side group with. A hydraulic circuit for a hydraulic excavator, characterized in that it is equipped with a valve.
ュエータ操作用の切換弁を全く操作しないときは油圧ポ
ンプの油をタンクに帰す如くすべての切換弁と連動せし
めた特許請求範囲第１項記載の油圧ショベルの油圧回路
。(2) The on-off valve provided in the oil passage on the discharge side of the hydraulic pump is linked to all the switching valves so that the oil of the hydraulic pump is returned to the tank when no switching valve for actuator operation is operated. Hydraulic circuit of the hydraulic excavator described in section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58138789A JPS6030735A (en) | 1983-07-28 | 1983-07-28 | Oil-pressure circuit for oil-pressure shovel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58138789A JPS6030735A (en) | 1983-07-28 | 1983-07-28 | Oil-pressure circuit for oil-pressure shovel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6030735A true JPS6030735A (en) | 1985-02-16 |
| JPH0377333B2 JPH0377333B2 (en) | 1991-12-10 |
Family
ID=15230246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58138789A Granted JPS6030735A (en) | 1983-07-28 | 1983-07-28 | Oil-pressure circuit for oil-pressure shovel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6030735A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110645220A (en) * | 2019-10-17 | 2020-01-03 | 江苏汇智高端工程机械创新中心有限公司 | Hydraulic system for work vehicle and excavator |
-
1983
- 1983-07-28 JP JP58138789A patent/JPS6030735A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110645220A (en) * | 2019-10-17 | 2020-01-03 | 江苏汇智高端工程机械创新中心有限公司 | Hydraulic system for work vehicle and excavator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0377333B2 (en) | 1991-12-10 |
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