JPS6030733A - Oil-pressure circuit for oil-pressure shovel - Google Patents
Oil-pressure circuit for oil-pressure shovelInfo
- Publication number
- JPS6030733A JPS6030733A JP58137582A JP13758283A JPS6030733A JP S6030733 A JPS6030733 A JP S6030733A JP 58137582 A JP58137582 A JP 58137582A JP 13758283 A JP13758283 A JP 13758283A JP S6030733 A JPS6030733 A JP S6030733A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- pipe
- pressure
- pilot
- switching valve
- 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】
この発明は油圧ショベルの油圧回路に関するものである
。その目的とするところは、
（１） １本のレバーあるいはペダルの操作だけで蛇行
なく直進走行を可能にすること。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic circuit for a hydraulic excavator. The objectives are: (1) To enable straight-line travel without meandering by simply operating a single lever or pedal.
（２）前記直進走行の操作中に他の操作、例えば旋回、
アーム、ブームあるいはバケット操作を同時にしても走
行の直進性能をＡｌｆｉ持し続けることができること、
そしてこれにより油圧ショベルの機能が高まり、多用途
への使用が可能となり、さらに運転者の疲労低減が計れ
ると共に、作業能率が向」ニする油圧ショベルの油圧回
路を提供しようとするものである。(2) Other operations, such as turning, during the straight-ahead operation
Alfi can maintain straight-line performance even when operating the arm, boom, or bucket at the same time.
The present invention aims to provide a hydraulic circuit for a hydraulic excavator that enhances the functionality of the excavator, allows it to be used for multiple purposes, reduces operator fatigue, and improves work efficiency.
第１図は従来型の油圧回路を示し、１は第１油圧ポンプ
、２は第２油圧ポンプで、それぞれ図示していないエン
ジンにて駆動される。５は第１コントロールバルブで、
左右走行用バルブ５ａ、旋回用バルブ５ｂ、アーム用バ
ルブ５ｃ、ブーム２速用バルブ５ｄ、メインリリーフバ
ルブ５ｅを有している。FIG. 1 shows a conventional hydraulic circuit, where 1 is a first hydraulic pump and 2 is a second hydraulic pump, each of which is driven by an engine (not shown). 5 is the first control valve,
It has a left/right travel valve 5a, a turning valve 5b, an arm valve 5c, a boom 2nd speed valve 5d, and a main relief valve 5e.
６は第２コンｌ〜ロールバルブで右走行用パルフロａ、
ブーム１速用バルブ６ｂ、パケット用バルブ６ｃ、メイ
ンバルブ６ｄを有している。6 is the second control l~roll valve and the palflo a for right travel,
It has a boom 1st speed valve 6b, a packet valve 6c, and a main valve 6d.
さて、この従来型油圧回路では、
（１）直進走行をする場合たえず左右の走行用バルブ５
ａと６８を同時に同方向に入れて保持しておかねばなら
ず、運転者の疲労が多くなる欠点があった。Now, in this conventional hydraulic circuit, (1) When traveling straight, the left and right traveling valves 5
A and 68 must be put in and held in the same direction at the same time, which has the disadvantage of increasing driver fatigue.
（２）又直進走行中に他の操作をした場合、その操作側
の油圧ポンプの吐出量が他の操作用にも分流することに
なるので、その操作側の走行モータの速度が低下し蛇行
する欠点があった。(2) If other operations are performed while traveling straight, the discharge amount of the hydraulic pump on the operation side will be diverted to other operations, so the speed of the travel motor on the operation side will decrease and the meandering will occur. There was a drawback.
本発明はこのような従来型油圧回路の欠点を改良したも
ので、その構成を要約すると次の如くである。The present invention improves the drawbacks of the conventional hydraulic circuit, and its structure can be summarized as follows.
即ち、
２ポンプ・２コン１〜ロールバルブを有する油圧ショベ
ルの油圧回路において、第１・第２コントロールバルブ
の左右走行用バルブと左右の走行モータとを連結する管
路に左右の走行モータへの圧油の絹排を独立と並列に切
換える切換弁を設け、かつ第１・第２コン１〜ロールバ
ルブの中立通路の最下流に各々中立通路を開・閉するパ
イロット切換弁を設けると共に、該パイロット切換弁の
前段から分岐した管路を前記切換弁に接続し、かつパイ
ロット切換弁のパイロット管路を前記切換弁の独立・並
列切換操作に連動して切換えられる切換弁に接続し、パ
イロット圧を供給・遮断するようにしたことを特徴とす
るものである。That is, in the hydraulic circuit of a hydraulic excavator having two pumps and two control valves, a pipe connecting the left and right travel motors to the left and right travel motors of the first and second control valves is connected to the left and right travel motors. A switching valve is provided to switch the discharge of pressure oil independently and in parallel, and a pilot switching valve is provided at the lowest downstream of the neutral passage of the first and second controllers 1 to roll valves to open and close the neutral passage, respectively. A pipe line branched from the front stage of the pilot switching valve is connected to the switching valve, and a pilot pipe line of the pilot switching valve is connected to a switching valve that is switched in conjunction with the independent/parallel switching operation of the switching valve, and the pilot pressure is It is characterized by supplying and cutting off the power.
以下本発明に係る油圧ショベルの油圧回路を第２図以下
の実施例について説明する。第２図において、１は第１
油圧ポンプ、２は第２油圧ポンプで３はパイロットポン
プであって、それぞれ図示していないエンジンにて駆動
される。４はパイコツ１−ポンプ用のリリーフバルブで
ある。DESCRIPTION OF THE PREFERRED EMBODIMENTS The hydraulic circuit of a hydraulic excavator according to the present invention will be described below with reference to the embodiments shown in FIG. In Figure 2, 1 is the first
The hydraulic pumps include a second hydraulic pump 2 and a pilot pump 3, each of which is driven by an engine (not shown). 4 is a relief valve for the Pykotsu 1 pump.
５は第１油圧ポンプ１より圧油が供給される第１コント
ロールバルブ、人定行用バルブ５ａ、旋回用バルブ５ｂ
、アーム用バルブ５ｃ、ブー１％ ２ Ｊ 用バルブ５
ｄ、メインリリーフバルブ５ｅを有し、又第１パイロッ
ト切換弁５ｆを中立通路の最下流に配している。Reference numeral 5 denotes a first control valve to which pressure oil is supplied from the first hydraulic pump 1, a valve for direct movement 5a, and a valve for turning 5b.
, valve 5c for arm, valve 5 for boo 1% 2 J
d, it has a main relief valve 5e, and a first pilot switching valve 5f is disposed at the most downstream side of the neutral passage.
６は第２油圧ポンプ２より圧油が供給される第２コン１
〜ロールバルブで右走行用バルブ６ａ、ブーム１速用バ
ルブ６ｂ、パケット用バルブ６ｃ、メインバルブ６ｄを
有し、又パイロット切換弁６ｅを、中立通路の最下流に
配している。6 is a second controller 1 to which pressure oil is supplied from the second hydraulic pump 2;
~The roll valve has a right travel valve 6a, a boom 1st speed valve 6b, a packet valve 6c, and a main valve 6d, and a pilot switching valve 6e is disposed at the lowest downstream of the neutral passage.
７．８はパイロン１〜切換弁５ｆ、６ｅから圧油を導び
く管路で夫々チェックバルブ９，９′ を介して後述す
る切換弁２１に接続する合流管路１０に合流している。Reference numeral 7.8 denotes a conduit for guiding pressure oil from the pylon 1 to the switching valves 5f and 6e, which merge into a confluence pipe 10 connected to a switching valve 21, which will be described later, via check valves 9 and 9', respectively.
１１と１２及び１３と１４は左走行用給排管路、１５と
１６及び１７と１８は右走行用給排管路である。11 and 12, 13 and 14 are supply and discharge pipes for left travel, and 15 and 16 and 17 and 18 are supply and discharge pipes for right travel.
】９はパイロン１〜切換弁５ｆ、６ｅと切換弁２０を結
ぶパイコツ１−管路、２０は前記パイロン１〜切換弁５
ｆ、Ｇｅのパイロン１へ圧を制御する切換弁で、中立位
置ではパイコツ１〜管２＆１９はタンクと接続され該管
路１９にパイロット圧は発生しないため、バイ日ノ１〜
切ａ Ｊｉ５ｆ 、 ６ｅは開かれた状態であるので第
１及び第２油圧ポンプ１，２の圧油は管路】０側には流
乳ない。] 9 is a pipe connecting the pylon 1 to the switching valve 5f, 6e and the switching valve 20; 20 is the pylon 1 to the switching valve 5;
This is a switching valve that controls the pressure to pylon 1 of f and Ge.In the neutral position, pylon 1 to pipes 2 & 19 are connected to the tank and no pilot pressure is generated in the pipe 19, so
Since the openings AJi5f and 6e are in the open state, the pressure oil of the first and second hydraulic pumps 1 and 2 is not flowing into the pipe line 0 side.
切換弁２０を「イ」あるいは「口」位置に切換えると、
バイロン１〜管路１９はパイロン１へポンプ３に接続さ
Ｊｔ、 、該ポンプ３からの圧油が供給され、パイコ切
換弁明換弁５ｆ、６ｅは開状態から閉状態に切換わり、
第１．第２油圧ポンプ１，２からの圧油は管路１０に流
れることとなる。When the switching valve 20 is switched to the "A" or "Open" position,
Byron 1 to pipe 19 are connected to pylon 1 and pump 3, and pressure oil is supplied from pump 3, and pico switching valves 5f and 6e are switched from open to closed,
1st. Pressure oil from the second hydraulic pumps 1 and 2 will flow into the pipe line 10.
２１は前記切換弁２０と連動して切換えられる並列・独
立切換弁で、中立位置では左走行用給排管路１１は管路
１２と、管路１３は管路１４と各々接続され、右走行用
給排管路１５は管路１６と、管路１７は管路１８と、又
合流管路１０はタンク通路に各々接続している。Reference numeral 21 denotes a parallel/independent switching valve that is switched in conjunction with the switching valve 20, and in the neutral position, the left running supply/discharge pipe 11 is connected to the pipe 12, the pipe 13 is connected to the pipe 14, and the right running supply/discharge pipe 11 is connected to the pipe 14. The supply/discharge pipe 15 is connected to a pipe 16, the pipe 17 is connected to a pipe 18, and the confluence pipe 10 is connected to a tank passage.
次に切換弁２１を「イ」位置に切換えた場合は、合流管
路１０は管路１２及び管路１８とに接続され、又管路１
３は管路１４と、管路１５は管路１６と接続され、他の
管路１１及び管路１７はブロックされる。逆にｒ口」位
置に切換えた場合は、合流管路１０は管路Ｉ４、管路１
６に接続さＪＬ、管路１１は管路１２と、管路】７は管
路１８とそれぞれ接続され、他の管路１３及ぞ管路１５
はブロックされる。このようにして、並列回路の場合の
モータへの圧油の供給方向を切換え１）り、後進走行を
可能にしている。Next, when the switching valve 21 is switched to the "A" position, the confluence pipe 10 is connected to the pipe 12 and the pipe 18, and the pipe 1 is connected to the pipe 12 and the pipe 18.
3 is connected to the pipe 14, pipe 15 is connected to the pipe 16, and the other pipes 11 and 17 are blocked. Conversely, when switching to the "r port" position, the confluence pipe 10 is pipe I4 and pipe 1.
6, pipe 11 is connected to pipe 12, pipe 7 is connected to pipe 18, and the other pipes 13 and 15
is blocked. In this way, the direction in which pressure oil is supplied to the motor in the case of a parallel circuit is switched 1), making it possible to travel backwards.
第３図は切換弁２１の内部接続の他の実施例を示すもの
で切換弁２１を「イ」及び「口」位置に切り換えた場合
、圧油供給側の管路１０と接続する管路以外はすべてタ
ンクと接続するような構造にしたものである。FIG. 3 shows another embodiment of the internal connection of the switching valve 21, and when the switching valve 21 is switched to the "A" and "Port" positions, the pipes other than those connected to the pipe 10 on the pressure oil supply side are All have a structure that connects them to the tank.
また、第４図は切換弁２０と切換弁２１の連動方法の他
の実施例を示すもので、切換弁２０を切換弁２１の補助
弁として直接切換可能にしたものである。FIG. 4 shows another embodiment of the interlocking method of the switching valve 20 and the switching valve 21, in which the switching valve 20 is used as an auxiliary valve for the switching valve 21 so that it can be directly switched.
更に、第５図は本発明の他の実施例を示すものでパイロ
ット切換弁５ｆ、［ｉｅの切換位置とパイコツ１〜圧の
供給を第２図のものと一部変更したものである。Furthermore, FIG. 5 shows another embodiment of the present invention, in which the switching positions of the pilot switching valves 5f and ie and the supply of pressure from the piston 1 are partially changed from those shown in FIG. 2.
即ち、第２図の実施例では、切換弁２０の中立位置では
パイ日ソ１〜管路１９をタンクに開放し、パイロット切
換弁５ｆ 、 ６ｅを開状態に保持しているのに苅し、
第５図の実施例では、切換弁２０の中立位置でパイ日ソ
１〜管路１９とパイロット油圧源とを接続し、該パイロ
ット圧によりパイロット切換ブ；５ｆ、６ｅを開状態に
保持している点が相違する以外は同じである。That is, in the embodiment shown in FIG. 2, when the switching valve 20 is in the neutral position, the pilot switching valves 1 to 19 are opened to the tank, and the pilot switching valves 5f and 6e are held open.
In the embodiment shown in FIG. 5, the pilot oil pressure source is connected to the piping line 19 to the pipe line 19 at the neutral position of the switching valve 20, and the pilot switching valves 5f and 6e are kept open by the pilot pressure. They are the same except that they are different.
なお前記した実施例では、パイロン１〜切換弁５ｆ。In the above embodiment, the pylon 1 to the switching valve 5f.
６ｅと切換弁２０とを連結するパイ日ソ１〜管路を合流
させた後、切換弁２０に導いた実施例について説明した
が、パイロット切換弁のパイ日ソ１〜管路を合流させず
に切換弁２１に連動する２個の切換弁によって個別に切
換えるようにすること、或はパイロット切換弁５ｆ、６
ｅ切換用のパイ日ソ１〜圧をパイロットポンプ３から導
いた例について例示しているがこのパイコツ１〜圧を第
１又は第２油圧ポンプから導くようにすること等、本発
明の要旨を逸脱しない範囲の変更が可能なことはいうま
でもない。An example has been described in which the pipes connecting the pilot switching valve 6e and the switching valve 20 are merged and then led to the switching valve 20. In this case, switching is performed individually by two switching valves linked to the switching valve 21, or by using pilot switching valves 5f and 6.
An example is shown in which the pressure for switching e is led from the pilot pump 3, but the gist of the present invention can be explained by introducing the pressure from the first or second hydraulic pump. It goes without saying that changes can be made within a range that does not deviate.
本発明は以上のような構成であって作動について以下説
明する。The present invention has the above structure, and its operation will be explained below.
１、直進走行を単独にする場合；
（ａ）切換弁２１を「イ」位置に切換えた場合、合流管
路１０は管路１２と管路１８とに各々接続され管路１３
は管路１４に、又、管路１５は管路１６とに各々接続さ
れ、管路１１及び管路】７はブロックとなる。又切換弁
２１に連動する切換ブｒ２０も「イ」位置に切換わるの
で、第２図の実施例ではパイ日ソ１〜管路１９にはパイ
ロワ１〜ポンプ３からの圧油が供給され、第５図の実施
例では、パイ日ソ１〜管路１９への圧油の供給が遮断さ
れパイロット切換弁５ｆ、６ｃはｒＡＪ位置に切換わる
。このことにより第１浦圧ポンプ１及び第２油圧ポンプ
２の圧油は夫々管路７及び管路８を経て合流管路１０に
合流し、切換弁２１を介して管路１２と管路１８に等量
に分流し、左右の走行モータに流入する。1. When traveling straight ahead alone; (a) When the switching valve 21 is switched to the "A" position, the merging pipe 10 is connected to the pipe 12 and the pipe 18, and the pipe 13 is connected to the pipe 12 and the pipe 18 respectively.
is connected to the conduit 14, and the conduit 15 is connected to the conduit 16, respectively, and the conduit 11 and the conduit 7 form a block. In addition, since the switching valve r20 linked to the switching valve 21 is also switched to the "A" position, in the embodiment shown in FIG. In the embodiment shown in FIG. 5, the supply of pressure oil to the pipe line 1 to the pipe line 19 is cut off, and the pilot switching valves 5f and 6c are switched to the rAJ position. As a result, the pressure oil of the first hydraulic pump 1 and the second hydraulic pump 2 flows through the conduit 7 and the conduit 8, respectively, into the confluence conduit 10, and then passes through the switching valve 21 to the conduit 12 and conduit 18. It flows into the left and right travel motors in equal amounts.
又左右の走行モータからの戻り油は各々管路１４及び管
路１Ｇ、切換弁２１を介して管路１３及び管路］５、左
走行用バルブ５ａ及び右走行用バルブ６ａを通ってタン
クに戻る。従って左右の走行モーフに同圧、同量の圧油
が供給され同速で前進方向に直進することとなる。In addition, the return oil from the left and right running motors passes through the pipe 14 and pipe 1G, the switching valve 21, the pipe 13 and the pipe [5], the left running valve 5a, and the right running valve 6a to the tank. return. Therefore, the same pressure and the same amount of pressure oil are supplied to the left and right traveling morphs, so that they move straight in the forward direction at the same speed.
（ｂ） １ｇＪ換ブｔ２１を「口」位置に切換えた場合
は」二記（、Ｊ）項の説明とは、走行モータへの圧油の
供給方向が逆になるが、同条にして左右走行モータは同
速で後進力面に直進することとなる。(b) When the 1gJ switching button t21 is switched to the "open" position, the direction of pressure oil supply to the travel motor is reversed from the explanation in item 2 (, J), but the The travel motor will travel straight to the reverse force plane at the same speed.
２、直進走行中に他の操作を同時にした場合；（ａ）直
進走行中の旋回同時操作の場合、切換弁２１を「イ」（
前進）あるいは「口」（後進）位置に切換え、なおかつ
旋回用バルブ５ｂを切換えた時、切換弁２０、パイロン
１〜切換弁５ｆ、６ｃは前記１− （ａ）、 １− （
ｂ）で説明したと同様になり、旋回用バルブ５ｂとパイ
ロン１へ切換弁５ｆはタンテｌｘ 回路となり、パイロ
ット切換弁５ｆ側には第１ポンプの圧油は流れず、全量
旋回モータ側に流入する。2. When other operations are performed at the same time while traveling straight; (a) If turning is simultaneously performed while traveling straight, the switching valve 21 is set to "A" (
When switching to the "forward" (forward) or "mouth" (reverse) position, and also when switching the turning valve 5b, the switching valve 20, pylon 1 to switching valves 5f, 6c operate as described in 1-(a), 1-(
The process is similar to that explained in b), and the swing valve 5b and the switching valve 5f to the pylon 1 form a tantalum x circuit, and the pressure oil from the first pump does not flow to the pilot switching valve 5f side, but flows entirely to the swing motor side. do.
又第２油圧ポンプ２の圧油は全ユ左右走行モータに分流
される。従って、旋回と走行は各々独立した油圧ポンプ
の圧油を使用することになり、旋回操作をしても直進走
行が可能である。Further, the pressure oil of the second hydraulic pump 2 is divided into all the left and right traveling motors. Therefore, pressure oil from independent hydraulic pumps is used for turning and traveling, and straight-line traveling is possible even when turning is performed.
（ｂ）直進走行中のアーム同時操作の場合；」−記２−
（ａ）と全く同様となり直進走行しながらアーム操作は
可能である。(b) In the case of simultaneous arm operation while traveling straight;” -Note 2-
It is exactly the same as (a), and arm operation is possible while traveling straight.
（ｃ）走行中のブーム同時操作の場合；前記２− （ａ
）、 ２− （ｂ）と圧油の供給側油圧ポンプか入れ替
るだけであとは同様であるので直進しながらブーム１速
操作は可能である。(c) In the case of simultaneous boom operation while traveling; 2-(a)
), 2-(b) and the hydraulic pump on the pressure oil supply side are replaced, and the rest is the same, so it is possible to operate the boom in 1st gear while moving straight.
（ｄ）直進走行中のパケット同時操作の場合；前記２−
（ｃ）と同様であり直進走行を維持しながらへヶノ１〜
操作が可能である。(d) In the case of simultaneous packet operations while traveling straight; 2-
It is the same as (c), and while maintaining straight running, Hegano 1 ~
Operation is possible.
以上の様に７１に発明は切換弁２Ｊと切換弁２０とを、
１本のレバーあるいはペダルの操作のみで第１、第２ポ
ンプからの合流と走行方向の切換が可ｆｉ日となり操作
が楽である。又」二記操作中に他の操作を行なっても走
行の直進性は維持することが出来、？Ｉ＋圧ショベルを
多目的に使用できる。As described above, the invention in 71 includes the switching valve 2J and the switching valve 20,
The merging from the first and second pumps and the switching of the traveling direction can be easily performed by operating only one lever or pedal, making the operation easy. Also, even if you perform other operations during the operation described in item 2, the straightness of the vehicle can be maintained. The I+ pressure excavator can be used for multiple purposes.
なお従来と同じ走行操作をする場合、切換弁２０゜２１
を操作せずに従来と同様左右走行用バルブ５ａ及び６ａ
を操作すれば可能である。また、第２，５図では第１．
第２の油圧ポンプ１，２は固定容量ポンプで表示したが
可変容量ポンプでもよく、さらに切換弁２０及びｌ、７
Ｊ換弁２１は手動操作で表示したか、パイ日ソ１〜操作
弁あるいは電磁弁てもよい。In addition, when performing the same traveling operation as before, the switching valve 20°21
Valve 5a and 6a for left and right travel as before without operating
This is possible by operating the . In addition, in Figs. 2 and 5, 1.
Although the second hydraulic pumps 1 and 2 are shown as fixed capacity pumps, they may also be variable capacity pumps.
The J switching valve 21 is shown to be manually operated, or may be a pi-nisso 1-operated valve or a solenoid valve.
さらに又、パイロン１〜切換弁５ｆ 、 ６ｅは第１．
第２コン１へロールバルブ５，６と各々−２体にしてい
るが別置でも勿論よい。Furthermore, the pylon 1 to the switching valves 5f and 6e are connected to the first pylon.
Although the second controller 1 and the roll valves 5 and 6 are each made into two pieces, they may of course be placed separately.
以−にの実施例ではｉ＋ｈ圧ショベルについて説明した
か、走行が油圧モータで駆動されしかも他の操作が油圧
モータあるいは油圧シリンダで駆動さ九る機械、例えば
油圧クローラクレーン等にも適用できることはいうまで
もない。In the embodiments described above, an i+h pressure excavator has been described, but the present invention can also be applied to machines whose travel is driven by a hydraulic motor and other operations are driven by a hydraulic motor or hydraulic cylinder, such as a hydraulic crawler crane. Not even.
第１図は従来型の油圧ショベルの油圧回路。
第２図は本発明に係る油圧回路。
第３図は切換弁２１の他の実施例。
第４図は２つの切換弁の連動方法の他の実施例。
第５図は本発明の他の実施例。
図において；
■ 第１油圧ポンプ ２ 第２油圧ポンプ３ パイロッ
トポンプ
／］（パイロットポンプ用）リリーフバルブ５ 第１コ
ン１−ロールバルブ
５ａ 左走行用バルブ
５ｂ 旋回用バルブ
５ｃ アーム用バルブ
５ｄ ブーム２速用バルブ
５ｅ メインリリーフバルブ
５ｆ パイロット切換ブｔ
６ 第２コントロールバルブ
６８ 右走行用バルブ
６ｂ フームＩ速用バルブ
６ｃ ハケノ１〜用バルブ
６ｄ ツインリリーフバルブ
６ｃ バイ日ノ１−切換弁
７ （第１ポンプグループのパイロット切換弁から圧油
を導びく）管路
８ （第２ポンプグループのパイ日ノ１〜切換弁から圧
油を導びく）管路
９．９′ チェックバルブ ′
１０（管路７と管路８の）合流管路
］ ］、 、 ＋ ２ 、 ］ ３ 、 Ｉ 、ｉ 左
走行用給排管路１５．１６．１７．１８ 右走行用給排
管路１９ パイ日ソ１〜管路
２０（パイロット切換弁５ｆ、６ｃを制御するための）
切換プｔ
２１ 切換弁
以」二
出願人 住友重機械工業株式会社
復代理人弁理士大橋 勇Figure 1 shows the hydraulic circuit of a conventional hydraulic excavator. FIG. 2 shows a hydraulic circuit according to the present invention. FIG. 3 shows another embodiment of the switching valve 21. FIG. 4 shows another embodiment of the method of interlocking two switching valves. FIG. 5 shows another embodiment of the present invention. In the figure: ■ First hydraulic pump 2 Second hydraulic pump 3 Pilot pump/] (for pilot pump) Relief valve 5 First control 1-roll valve 5a Left running valve 5b Turning valve 5c Arm valve 5d Boom 2nd speed Valve 5e Main relief valve 5f Pilot switching button t 6 Second control valve 68 Right-hand drive valve 6b Foam I speed valve 6c Hakeno 1~ valve 6d Twin relief valve 6c Bi-Hino 1-switching valve 7 (1st pump Pipe 8 (conducts pressure oil from the pilot switching valve of the second pump group) Pipe 9,9' Check valve '10 (conducts pipe 7 and ) Merging pipe of pipe 8] ], , + 2, ] 3, I, i Supply and discharge pipe for left running 15.16.17.18 Supply and discharge pipe for right running 19 Pi-Nissho 1 to pipe 20 (for controlling pilot switching valves 5f and 6c)
Switching valve t 21 Switching valve 2 Applicant: Sumitomo Heavy Industries, Ltd. Sub-agent Patent attorney Isamu Ohashi
Claims (1)
ルの油圧回路において、第１・第２コン１〜ロールバル
ブの左右走行用バルブと左右の走行モータとを連結する
管路に左右の走行モータへの圧油の給排を独立と並列に
切換える切換弁を設け、かつ第１・第２コン１〜ロール
バルブの中立通路の最下流に各々中立通路を開・閉する
パイロット切換力を設けると共に、該パイロン１〜切換
弁の前段から分岐した管路を前記切換弁に接続し、かつ
パイロット切換力のパイロン１〜管路を前記切換弁の独
立・並列切換操作に連動して切換えられる切換弁に接続
し、パイ日ノ１〜圧を供給・遮断するようにしたことを
特徴どする油圧ショベルの油圧回路。In the hydraulic circuit of a hydraulic excavator with 2 pumps and 2 controllers and a roll valve, a pipe connecting the left and right travel motors of the first and second controllers 1 to 1 roll valve and the left and right travel motors is connected to the left and right travel motors. A switching valve is provided to switch the supply and discharge of pressure oil independently and in parallel, and a pilot switching force is provided to open and close the neutral passages at the lowest downstream of the neutral passages of the first and second control 1 to roll valves, respectively. A pipe line branched from the front stage of the pylon 1 to the switching valve is connected to the switching valve, and the pilot switching power pylon 1 to the pipe line is connected to the switching valve that is switched in conjunction with the independent/parallel switching operation of the switching valve. A hydraulic circuit for a hydraulic excavator, which is connected to supply and cut off pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58137582A JPS6030733A (en) | 1983-07-29 | 1983-07-29 | Oil-pressure circuit for oil-pressure shovel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58137582A JPS6030733A (en) | 1983-07-29 | 1983-07-29 | Oil-pressure circuit for oil-pressure shovel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6030733A true JPS6030733A (en) | 1985-02-16 |
| JPH0411689B2 JPH0411689B2 (en) | 1992-03-02 |
Family
ID=15202081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58137582A Granted JPS6030733A (en) | 1983-07-29 | 1983-07-29 | Oil-pressure circuit for oil-pressure shovel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6030733A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62133759U (en) * | 1986-02-13 | 1987-08-22 |
-
1983
- 1983-07-29 JP JP58137582A patent/JPS6030733A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62133759U (en) * | 1986-02-13 | 1987-08-22 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0411689B2 (en) | 1992-03-02 |
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