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JPS6229629A - Oil pressure apparatus for construction vehicle - Google Patents

Oil pressure apparatus for construction vehicle

Info

Publication number
JPS6229629A
JPS6229629A JP60170110A JP17011085A JPS6229629A JP S6229629 A JPS6229629 A JP S6229629A JP 60170110 A JP60170110 A JP 60170110A JP 17011085 A JP17011085 A JP 17011085A JP S6229629 A JPS6229629 A JP S6229629A
Authority
JP
Japan
Prior art keywords
switching valve
travel
pump
valve
running
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
Application number
JP60170110A
Other languages
Japanese (ja)
Other versions
JPH0694679B2 (en
Inventor
Keiji Sekikawa
関川 啓治
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KYB Corp
Original Assignee
Kayaba Industry Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kayaba Industry Co Ltd filed Critical Kayaba Industry Co Ltd
Priority to JP60170110A priority Critical patent/JPH0694679B2/en
Publication of JPS6229629A publication Critical patent/JPS6229629A/en
Publication of JPH0694679B2 publication Critical patent/JPH0694679B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2278Hydraulic circuits
    • E02F9/2292Systems with two or more pumps
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2221Control of flow rate; Load sensing arrangements
    • E02F9/2239Control 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)
  • Motor Power Transmission Devices (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control Of Fluid Gearings (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

PURPOSE:To miniaturize a running-priority change-over valve, by making the whole discharge of oil from one side pump flow into the running-priority change- over valve, and by making as much as flow quantity of oil distributed to both the running change-over valves, flow into, on rectilinear running priority. CONSTITUTION:When a running-priority change-over valve 47 is positioned on the left side, then the whole discharge of oil flows from the largest and one side pump P1, and when the valve 47 is switched and positioned on the right side, then the distributed discharge of oil from the other pump P2 flows. Then, the capacity of the running-priority change-over valve 47 is the sum of the whole discharge Q from one side pump, and (1/2)Q of the discharge from the other side pump. The capacity of the running-priority change-over valve 47 is reduced and the dimension is also reduced. In this way, the running-priority change-over valve can be miniaturized, and even if both the actuators in running system and working machine system are worked at the same time, the rectilinear running of a vehicle can be compensated.

Description

【発明の詳細な説明】 (産業上の利用分野) この発明は、例えば、パワーショベル等の建設車両にお
いて、走行系のアクチュエータと、作業機系の7クチユ
エータとを同時に動作した場合にも、当該車両の直進走
行を補償しうる建設車両の油圧装着に関する。
[Detailed Description of the Invention] (Industrial Application Field) The present invention can be applied to construction vehicles such as power shovels, for example, even when the travel system actuator and the work equipment system seven actuators are operated at the same time. This invention relates to hydraulic installation for construction vehicles that can compensate for straight-line traveling of the vehicle.

(従来の技術) 第4図は、既に我々が提供しているこの種の目的をもっ
た従来装置の回路系統であって、その一方の回路系統に
は、その上流側から、左走行モータ用切換弁1、ブーム
増速用切換弁?、旋回用切換弁3、アーム用切換弁4を
パラレルに接続している。また、他方の回路系統には、
その」二流側から、右走行モータ′用切換弁5、パケッ
ト用切換弁6、ブーム用切換弁7をパラレルに接続して
いる。
(Prior Art) Fig. 4 shows a circuit system of a conventional device for this kind of purpose that we have already provided. Switching valve 1, boom speed increase switching valve? , a swing switching valve 3, and an arm switching valve 4 are connected in parallel. Also, in the other circuit system,
A switching valve 5 for the right travel motor, a switching valve 6 for the packet, and a switching valve 7 for the boom are connected in parallel from the second flow side.

一方の回路系統に接続したポンプPIは、通路9を介し
て走行優先切換弁10に接続するとともに、この走行優
先切換弁10よりも上流側において、上記通路9から枝
別れする通路11を介して、一方の回路系統の最上流の
切換弁1にも接続している。そして、上記通路11は、
一方の回路系統の各切換弁1〜4が図示の中立位置にあ
るとき、センタバイパス通路12及び戻り通路13を介
して、タンクTに連通ずる。
The pump PI connected to one circuit system is connected to a travel priority switching valve 10 via a passage 9, and is also connected to a travel priority switching valve 10 via a passage 11 branching from the passage 9 on the upstream side of the travel priority switching valve 10. , is also connected to the most upstream switching valve 1 of one circuit system. The passage 11 is
When the switching valves 1 to 4 of one circuit system are in the illustrated neutral position, they communicate with the tank T via the center bypass passage 12 and the return passage 13.

また、他方のポンプP2は1通路14を介して走行優先
切換弁lOに接続するとともに、この走行優先切換弁よ
りも上流側において、上記通路14から枝別れさせた他
方の回路系統のパラレル通路15にも接続しているが、
このパラレル通路15には、他方の回路系統の切換弁6
.7が接続されている。
In addition, the other pump P2 is connected to the travel priority switching valve lO through a passage 14, and on the upstream side of the travel priority switching valve, a parallel passage 15 of the other circuit system is branched from the passage 14. It is also connected to
This parallel passage 15 has a switching valve 6 for the other circuit system.
.. 7 is connected.

そして、走行優先切換弁lOは、スプリングIBの作用
で1通常は、図示のノーマル位置を保持するとともに、
そのパイロット室10aにパイロットポンプP3のパイ
ロット圧が作用すると、上記スプリング16に抗して図
面右側位置に切換わる。
The travel priority switching valve lO normally maintains the normal position shown in the figure by the action of the spring IB.
When the pilot pressure of the pilot pump P3 acts on the pilot chamber 10a, it is switched to the right position in the drawing against the spring 16.

走行優先切換弁10が図示のノーマル位置にあるときに
は、一方のポンプPIが、この走行優先切換弁IOを介
して、一方の回路系統のパラレル通路17に接続すると
ともに、ポンプP2が他方の回路系統の通路18を介し
て最上流の切換弁5に接続する。そして、上記パラレル
通路17は、切換弁2〜4をパラレルに接続するととも
に、通路18は、他方の回路系統の切換弁5〜7が図示
の中立位置にあるとき、センタバイパス通路18及び上
記戻り通路13を介してタンクTに接続する。
When the travel priority switching valve 10 is in the normal position shown, one pump PI is connected to the parallel passage 17 of one circuit system via the travel priority switching valve IO, and the pump P2 is connected to the parallel passage 17 of the other circuit system. It is connected to the most upstream switching valve 5 through a passage 18. The parallel passage 17 connects the switching valves 2 to 4 in parallel, and the passage 18 connects the center bypass passage 18 and the return valve when the switching valves 5 to 7 of the other circuit system are in the neutral position shown. It is connected to tank T via passage 13.

また、走行優先切換弁10が図面右側位置に切換わると
、一方のポンプP1がこの走行優先切換弁lOを介して
、通路18にも接続する。つまり、この状態では、ポン
プP1が、左走行モータを制御する切換弁1と、右走行
モータを制御する切換弁5との両者に連通ずるので、そ
れら両走行モータには、一方のポンプPI の吐出油が
振り分けられることになる。
Further, when the travel priority switching valve 10 is switched to the right side position in the drawing, one pump P1 is also connected to the passage 18 via the travel priority switching valve IO. In other words, in this state, the pump P1 communicates with both the switching valve 1 that controls the left running motor and the switching valve 5 that controls the right running motor, so that one pump PI is connected to both running motors. The discharged oil will be distributed.

さらに、走行優先切換弁10が上記のように右側位置に
切換われば、他方のポンプP2が、一方の回路系統のパ
ラレル通路17にも接続する。したかって、この場合に
は、他方のポンプP2の吐出油は、両回路系統のパラレ
ル通路17及び15に供給されることになる。
Further, when the travel priority switching valve 10 is switched to the right position as described above, the other pump P2 is also connected to the parallel passage 17 of one circuit system. Therefore, in this case, the oil discharged from the other pump P2 is supplied to the parallel passages 17 and 15 of both circuit systems.

上記のようにした両回路系統の所定の切換弁には、開閉
弁1a〜4a、5a、6aを設けているが、これら開閉
弁は、図示の中立位置にあるときに開弁し、当該切換弁
を左右いずれかに切換えたときに閉弁する構成にしてい
る。
The predetermined switching valves of both circuit systems as described above are provided with on-off valves 1a to 4a, 5a, and 6a, and these on-off valves open when they are in the neutral position shown, The valve is configured to close when the valve is switched to either the left or right side.

上記パイロットポンプP3の吐出油は、バイロフト通路
23に供給され、このパイロット通路23は、走行優先
切換弁10のパイロット室10aに連通ずるとともに、
このパイロット通路23には、第1〜3分岐通路24〜
2Bを接続しいてる。
The oil discharged from the pilot pump P3 is supplied to a biloft passage 23, and this pilot passage 23 communicates with the pilot chamber 10a of the travel priority switching valve 10.
This pilot passage 23 includes first to third branch passages 24 to
2B is connected.

上記第1分岐通路24は一方の回路系統の開閉弁1aに
接続し、この開閉弁1aが図示の開位置にあるとき、タ
ンクTに連通ずる。
The first branch passage 24 is connected to the on-off valve 1a of one circuit system, and communicates with the tank T when the on-off valve 1a is in the open position shown.

上記第2分岐通路25は他方の回路系統の開閉弁5aに
接続し、この開閉弁5aが図示の開位置にあるとき、タ
ンクTに連通ずる。
The second branch passage 25 is connected to the on-off valve 5a of the other circuit system, and communicates with the tank T when the on-off valve 5a is in the open position shown.

さらに、第3分岐通路26は、開閉弁2aから4a及び
6aをタンデムに接続し、最下流の開閉弁6aを介して
タンクTに連通ずる構成にしている。したがって、上記
開閉弁2a〜4a及び6aのいずれかが、閉位置に切換
わると、当該第3分岐通路26はタンクTへの連通が遮
断されることになる。
Further, the third branch passage 26 connects the on-off valves 2a to 4a and 6a in tandem, and communicates with the tank T via the most downstream on-off valve 6a. Therefore, when any of the on-off valves 2a to 4a and 6a is switched to the closed position, the third branch passage 26 is disconnected from the tank T.

上記のように構成した従来の装置では、切換弁l、5の
みを切換えたときには、一方のポンプP1 の吐出油が
通路11を経由して左走行モータを制御する走行モータ
用切換弁1に供給され、他方のポンプP2の吐出油が図
示のノーマル位置を保持した走行優先切換弁lO及び通
路18を経由して右走行モータを制御する走行モータ用
切換弁5に供給される。
In the conventional device configured as described above, when only the switching valves 1 and 5 are switched, the oil discharged from one pump P1 is supplied to the travel motor switching valve 1 that controls the left travel motor via the passage 11. The oil discharged from the other pump P2 is supplied to the travel motor switching valve 5, which controls the right travel motor, via the travel priority switching valve lO, which maintains the normal position as shown, and the passage 18.

また、走行モータ用切換弁1,5を中立位置に保持し、
作業機系のアクチュエータを制御する切換弁2〜4ある
いは6.7を切換えたときは、一方のポンプP1 の吐
出油が図示のノーマル位置にある走行優先切換弁10及
びパラレル通路17を経由して上記切換弁2〜4に供給
され、他方のポンプP2の吐出油がパラレル通路15を
経由して各切換弁6.7に供給される。
In addition, the travel motor switching valves 1 and 5 are held in neutral positions,
When the switching valves 2 to 4 or 6.7 that control the actuators of the work equipment system are switched, the oil discharged from one pump P1 is transferred via the travel priority switching valve 10 and the parallel passage 17, which are in the normal position as shown. The oil discharged from the other pump P2 is supplied to the switching valves 2 to 4, and the oil discharged from the other pump P2 is supplied to each switching valve 6.7 via the parallel passage 15.

そして、走行系の切換弁1,5及び作業機系の切換弁2
〜4.6のうちのいずれかを同時に切換えると、開閉弁
1a、5aとともに作業機系の開閉弁のいずれかが閉じ
るので、バイロー/ ト圧が発生するが、このパイロッ
ト圧が走行優先切換弁10のパイロット室10aに作用
し、当該走行優先切換弁10を図面右側位置に切換える
Then, the travel system switching valves 1 and 5 and the work equipment system switching valve 2
- 4. If any one of 6 is switched at the same time, one of the on-off valves of the work equipment system will be closed together with on-off valves 1a and 5a, so by-rotate pressure will be generated, but this pilot pressure will be used as the travel priority switching valve. 10, and switches the travel priority switching valve 10 to the right position in the drawing.

この状態では、一方のポンプP1の吐出油が、両足行モ
ータを制御する両切換弁1.5に供給され、他方のポン
プP2の吐出油がパラレル通路15.17のそれぞれに
供給される。
In this state, the oil discharged from one pump P1 is supplied to both switching valves 1.5 that control the two-leg motor, and the oil discharged from the other pump P2 is supplied to each of the parallel passages 15.17.

このように走行モータと作業機系の7クチユエータとを
同時に作動させたときにほ、走行モータと作業機系アク
チュエータとを独立させ、作業機系の7クチユエータの
負荷に影響されることなく走行モータが駆動するように
している。
In this way, when the travel motor and the 7 actuators of the work equipment system are operated simultaneously, the travel motor and the work equipment system actuator can be made independent, and the travel motor can be operated without being affected by the load of the 7 actuators of the work equipment system. is trying to be driven.

(本発明が解決しようとする問題点) 上記のようにした従来の装置では、走行優先切換弁が4
ポートを必要とするとともに、両ポンプの吐出量全量が
通過するだけの容量が必要になるので、この走行優先切
換弁が大型化するという問題があった。
(Problems to be Solved by the Present Invention) In the conventional device as described above, the travel priority switching valve is
Since a port is required and a capacity is required to allow the entire discharge amount of both pumps to pass through, there is a problem in that the travel priority switching valve becomes large.

この発明の目的は、走行優先切換弁を小型化できる装置
を提供することである。
An object of the present invention is to provide a device that can reduce the size of a travel priority switching valve.

(問題点を解決する手段) この発明は、上記の目的を達成するために、それぞれに
ポンプを接続した一対の回路系統を備え、一方の回路系
統は、作業機系の7クチユエータを制御する作業機用切
換弁に対して走行系のアクチュエータを制御する走行用
切換弁をパラレルに接続するとともに、他方の回路系統
は、少なくとも走行用切換弁を最上流に置いてこれをタ
ンデム接続とし、かつ、パラレル接続側の回路系統の走
行用切換弁の上流側に走行優先切換弁を接続し、この走
行優先切換弁は、走行系の7クチユエータのみを動作さ
せているときに、パラレル接続側の回路系統の走行用切
換弁に接続した供給通路を全開状態に保つ一方、これら
走行系のアクチュエータと同時に所定の作業機系アクチ
ュエータを動作させたときにほ切換え動作して、上記ノ
々ラレル接続側の回路系統の走行用切換弁をタンデム接
続側の回路系統の走行用切換弁に対してノくラレル接続
に切換えるように構成している。
(Means for Solving the Problems) In order to achieve the above object, the present invention includes a pair of circuit systems each having a pump connected thereto, and one circuit system is used to control seven cutters of a working machine system. A travel switching valve that controls the actuator of the travel system is connected in parallel to the machine switching valve, and the other circuit system is connected in tandem with at least the travel switching valve placed at the most upstream position, and A travel priority switching valve is connected to the upstream side of the travel switching valve in the circuit system on the parallel connection side, and this travel priority switching valve switches the circuit system on the parallel connection side when only the 7-cut unit of the travel system is operating. While keeping the supply passage connected to the traveling switching valve fully open, when a predetermined work equipment system actuator is operated at the same time as these traveling system actuators, the switching operation is performed and the circuit on the above-mentioned normal connection side is The running switching valve of the system is configured to be switched to parallel connection with the running switching valve of the circuit system on the tandem connection side.

(本発明の作用) この発明は、上記のように構成したので、両回路系統の
走行用切換弁のみを切換えたときには、走行優先切換弁
が、パラレル接続側の回路系統の走行用切換弁と一方の
ポンプとを連通ずる供給流路を全開する。したがって、
両ポンプはそれぞれ独立して、対応する走行モータに圧
油を供給する。
(Operation of the present invention) Since the present invention is constructed as described above, when only the travel switching valves of both circuit systems are switched, the travel priority switching valve is switched between the travel switching valve of the circuit system on the parallel connection side. Fully open the supply channel that communicates with one of the pumps. therefore,
Both pumps independently supply pressure oil to the corresponding travel motors.

そして、走行中に作業機系の7クチユエータを動作させ
ると、一方のポンプの吐出油は、当該作業機系のアクチ
ュエータに供給されるとともに、他方のポンプの吐出油
が1両足行モータに振り分けられる。
Then, when the seven actuators of the work equipment system are operated while driving, the oil discharged from one pump is supplied to the actuator of the work equipment system, and the oil discharged from the other pump is distributed to the single two-leg motor. .

(本発明の効果) この発明の装置によれば、走行優先切換弁には、一方の
ポンプの全吐出量が流入するとともに、直進走行優先時
には、他方のポンプの吐出量のうち、再走行用切換弁に
振り分けられた流量分だけが流入することになるので、
従来のように両ポンプの全量が流入する場合と異なり、
当該走行優先切換弁を小型にできる。
(Effects of the present invention) According to the device of the present invention, the entire discharge amount of one pump flows into the travel priority switching valve, and when priority is given to traveling straight ahead, part of the discharge amount of the other pump is used for re-travel. Only the amount of flow distributed to the switching valve will flow in, so
Unlike the conventional case where the entire amount of both pumps flows in,
The travel priority switching valve can be made smaller.

(本発明の実施例) 第1図は第1実施例を示すもので、一方の回路系統のバ
ルブブロックAには、その上流側から走行用切換弁31
.ブーム増速用切換弁32.旋回用切換弁33及びアー
ム用切換弁34を設けている。そして、これら各切換弁
31〜34は、パラレル通路35及びこのパラレル通路
から枝別れした供給流路36〜39を介して、一方のポ
ンプPI に接続するとともに、それら各切換弁31〜
34が図示の中立位置にあるとき、センタバイパス通路
40が開いて、当該一方のポンプPI の吐出油をドレ
ンされる構成にしてる。
(Embodiment of the present invention) Fig. 1 shows a first embodiment, in which a valve block A of one circuit system has a travel switching valve 31 from its upstream side.
.. Boom speed increase switching valve 32. A swing switching valve 33 and an arm switching valve 34 are provided. Each of these switching valves 31 to 34 is connected to one of the pumps PI via a parallel passage 35 and supply channels 36 to 39 branched from this parallel passage, and each of these switching valves 31 to
34 is in the neutral position shown, the center bypass passage 40 is opened and the discharge oil of the one pump PI is drained.

また、他方の回路系統のバルブブロックBには、その上
流側から走行用切換弁41.バケット用切換弁42及び
ブーム用切換弁43を設けている。そして、上記走行用
切換弁41はポンプ通路44を介して、他方のポンプP
2に接続するとともに、走行用切換弁41とパケット用
切換弁42とをセターバイパス通路45を介してタンデ
ムに接続している。さらに、上記パケット用切換弁42
とブーム用切換弁43とハハラレル通路48を介してパ
ラレルに接続している。
Further, in the valve block B of the other circuit system, a traveling switching valve 41. A bucket switching valve 42 and a boom switching valve 43 are provided. The travel switching valve 41 is connected to the other pump P via the pump passage 44.
2, and the traveling switching valve 41 and the packet switching valve 42 are connected in tandem via a setter bypass passage 45. Furthermore, the packet switching valve 42
are connected in parallel via a boom switching valve 43 and a hahararel passage 48.

このようにした両回路系統のうち、一方の回路系統のバ
ルブブロックAの供給流路38には、走行優先切換弁4
7を接続している。この走行優先切換弁47は、3ボ一
ト2位置切換弁で、その第1流入ボート48と流出ポー
ト4!3とが前記供給流路36に開口し、第2流入ボー
ト50が、チェック弁51を設けた第1連通路52を介
して他方のポンプP2に接続している。
Of the two circuit systems configured in this way, the supply flow path 38 of the valve block A of one circuit system has a traveling priority switching valve 4.
7 is connected. The traveling priority switching valve 47 is a three-bottom, two-position switching valve, with its first inflow port 48 and outflow port 4!3 opening into the supply channel 36, and its second inflow port 50 opening into the check valve. It is connected to the other pump P2 via a first communication path 52 provided with a pump P2.

上記のようにした走行優先切換弁47は、スプリング5
3の作用で、通常は、図示の左側位置を保持する。この
左側位置において、前記供給流路3Gを全開するととも
に、第2流入ポート50を閉じるので、走行用切換弁3
1には一方のポンプPI の吐出油のみが供給される。
The travel priority switching valve 47 configured as described above has a spring 5
3, the left side position shown in the figure is normally maintained. At this left position, the supply flow path 3G is fully opened and the second inflow port 50 is closed, so the travel switching valve 3
Only the oil discharged from one pump PI is supplied to pump 1.

そして、パイロット室54にパイロット圧が作用して、
当該走行優先切換弁47が図面右側位置に切換わると、
第1流入ボート4日は、絞り55及びチェック弁56を
介して流出ポート49に連通ずるとともに、第2流入ポ
ー)50が二記チェック弁5Bの下流側に直接連通ずる
Then, pilot pressure acts on the pilot chamber 54,
When the travel priority switching valve 47 is switched to the right position in the drawing,
The first inflow port 4 communicates with the outflow port 49 via the throttle 55 and check valve 56, and the second inflow port 50 directly communicates with the downstream side of the second check valve 5B.

なお、上記チェック弁56は、他方のポンプP2の吐出
油が、負荷の関係で第1連通路52から第1流入ポート
4日に逆流して走行用切換弁31に供給されなくなるの
を阻止するものである。
Note that the check valve 56 prevents the oil discharged from the other pump P2 from flowing backward from the first communication passage 52 to the first inlet port 4 due to the load and not being supplied to the travel switching valve 31. It is something.

上記のようにした走行優先切換弁47のパイロット室5
4には、パイロット通路57を介してパイロットボン7
’P3 を接続しているが、こ、のパイロット通路57
に接続した分岐通路58は、作業機系のアクチュエータ
を制御する切換弁32〜34汲、び切換弁42が図示の
中立位置にあるとき、それらv1換弁に設けた補助バル
ブ59〜θ2を介してタンクTに連通ずる。
Pilot chamber 5 of travel priority switching valve 47 as described above
4 is connected to the pilot bone 7 via the pilot passage 57.
'P3 is connected, but this pilot passage 57
When the switching valves 32 to 34 that control the actuators of the work equipment system and the switching valve 42 are in the neutral position shown in the figure, the branch passage 58 connected to Connects to tank T.

なお、図中符号63はチェック弁64を設けた第2連通
路で、一方のポンプPI と、パケット用切換弁42の
供給側通路とを接続する。
In addition, the reference numeral 63 in the figure is a second communication passage provided with a check valve 64, which connects one pump PI and the supply side passage of the packet switching valve 42.

しかして、作業機系のアクチュエータを停止した状態、
換言すれば、切換弁32〜34及び切換弁42を図示の
中立位置に保持した状態では、パイロットポンプP3の
圧油が、分岐通路58を経由してタンクTに落ちるので
、パイロット室54にパイロット圧が作用せず、当該走
行優先切換弁47が、スプリング53の作用で図示の左
側位置を保持する。
However, when the actuator of the work equipment is stopped,
In other words, when the switching valves 32 to 34 and the switching valve 42 are held in the neutral position shown in the figure, the pressure oil of the pilot pump P3 falls into the tank T via the branch passage 58, so that the pilot is not in the pilot chamber 54. No pressure is applied, and the travel priority switching valve 47 is maintained at the left position as shown in the figure by the action of the spring 53.

走行優先切換弁47が上記左側位置を保った状態では、
第1流入ボート48と流出ポート48とが連通して、供
給流路38が全開するので、走行用切換弁31と41と
を同時に切換えたとき、それぞれのポンプPl 、P2
の全吐出油が、図示していない再走行モータに独立して
供給される。
When the travel priority switching valve 47 maintains the above left position,
Since the first inflow boat 48 and the outflow port 48 communicate with each other and the supply flow path 38 is fully opened, when the travel switching valves 31 and 41 are switched simultaneously, the respective pumps Pl and P2
The entire discharged oil is independently supplied to a re-travel motor (not shown).

一方1作業機系の7クチユエータを駆動させるために、
切換弁32〜34.42のいずれかを切換えると、その
切換弁に対応した補助バルブも同時に切換わり、パイロ
ットポンプP3とタンクTとの連通を遮断する。
On the other hand, in order to drive the 7 cutter units of 1 work equipment system,
When any of the switching valves 32 to 34 or 42 is switched, the auxiliary valve corresponding to the switching valve is also switched at the same time, cutting off communication between the pilot pump P3 and the tank T.

したがって、パイロットポンプの吐出圧がパイロット室
54に作用し、走行優先切換弁47が右側位置に切換わ
る。
Therefore, the discharge pressure of the pilot pump acts on the pilot chamber 54, and the travel priority switching valve 47 is switched to the right position.

走行優先切換弁47が右側位置に切換ゎると、第1流入
ボート48と流出ポート48との間に絞り55が位置す
るので、一方のポンプP1 の吐出油は、パラレル通路
35を介して、下流側の作業機系の7クチユエータに優
先的に供給されるとともに、第2連通路83を経由して
パケット用切換弁42にも供給される。
When the travel priority switching valve 47 is switched to the right position, the throttle 55 is located between the first inflow boat 48 and the outflow port 48, so the oil discharged from one pump P1 flows through the parallel passage 35. It is preferentially supplied to the seven cutout units of the work machine system on the downstream side, and is also supplied to the packet switching valve 42 via the second communication path 83.

また、他方のポンプP2の吐出油は、他方の回路系統の
走行用切換弁41に供給されるとともに、第1連通路5
2→第2流入ポー)50+流出ボート48→供給流路3
Bを経由して、一方の回路系統の走行用切換弁31にも
供給される。
Further, the discharge oil of the other pump P2 is supplied to the travel switching valve 41 of the other circuit system, and the first communication passage 5
2→2nd inflow port) 50+outflow boat 48→supply channel 3
Via B, it is also supplied to the travel switching valve 31 of one circuit system.

したがって、この場合には、一方のポンプP1で作業機
系のアクチュエータを駆動し、他方のポンプP2で両回
路系統の走行モータを駆動するようになる。
Therefore, in this case, one pump P1 drives the actuator of the working machine system, and the other pump P2 drives the travel motors of both circuit systems.

なお、他方の回路系統の各切換弁41〜43を中立位置
に保持したまま、一方の回路系統の作業機系のアクチュ
エータだけを駆動したときも、走行優先切換弁47が切
換わるが、この場合に前記チx ?り弁51が無ければ
、一方のポンプP1の吐出油が、絞り55から第1連通
路52を経由し、他方の回路系統から流出してしまう、
したがって、上記チェック弁51は、一方のポンプP1
の吐出油が他方の回路系統のポンプ通路44及びセンタ
ノくイノ々ス通路45からタンクTに流出するのを防止
する機能を発揮している。
Note that the travel priority switching valve 47 is also switched when only the actuator of the work equipment system in one circuit system is driven while the switching valves 41 to 43 in the other circuit system are held in the neutral position. What about the above? Without the valve 51, the oil discharged from one pump P1 would flow from the throttle 55 through the first communication path 52 and out of the other circuit system.
Therefore, the check valve 51 is connected to one pump P1.
It has a function of preventing the discharged oil from flowing out into the tank T from the pump passage 44 and the central injection passage 45 of the other circuit system.

また、第2連通路83に設けたチェック弁64も、上記
と同様の機能を発揮しているもので、他方のポンプP2
の吐出油が、一方の回路系統のセンターバイパス通路4
0から流出するのを防止する機能を発揮している。
Further, the check valve 64 provided in the second communication passage 83 also has the same function as above, and the other pump P2
The discharged oil flows through the center bypass passage 4 of one circuit system.
It functions to prevent leakage from 0.

上記のようにしたこの第1実施例の走行優先切換弁47
には、それが左側位置にあるとき、最大で一方のポンプ
P1の全吐出量が流れる。また、右側位置に切換わった
ときは、他方のポンプP2から振り分けられた流量分が
流れることになる。
Travel priority switching valve 47 of this first embodiment as described above
At most, the entire output of one pump P1 flows when it is in the left-hand position. Furthermore, when the pump is switched to the right side position, the flow rate distributed from the other pump P2 will flow.

したがって、この走行優先切換弁47の容量は、一方の
ポンプ吐出量の全量Qと、他方のポンプ吐出量の(1/
2)Qとの合計になり、従来の装置に比べて、この走行
優先切換弁47の容量を小さくできる。しかも、この走
行優先切換弁47は、3ポート弁で足りるので、上記容
量を小さくできることと相まって、当該走行優先切換弁
を小型化できる。
Therefore, the capacity of this travel priority switching valve 47 is the total amount Q of one pump discharge amount and (1/
2) The capacity of the traveling priority switching valve 47 can be made smaller than that of the conventional device. Furthermore, since a three-port valve is sufficient for the travel priority switching valve 47, the capacity can be reduced, and the travel priority switching valve 47 can be downsized.

なお、上記走行優先切換弁47は、パルプブロックAの
外部に設けてもよいこと当然である。
Note that it goes without saying that the travel priority switching valve 47 may be provided outside the pulp block A.

第2図は第2実施例を示すもので、この第2実施例と上
記第1実施例との相違点は、パイロットポンプP3に接
続した回路構成だけなので、以下の第2実施例の説明で
は、上記相違点のみを明らかにするとともに、共通要素
については同一符号を付して説明する。
FIG. 2 shows a second embodiment, and the only difference between this second embodiment and the first embodiment described above is the circuit configuration connected to the pilot pump P3. , only the above-mentioned differences will be clarified, and common elements will be described with the same reference numerals.

この第2実施例では、一方の回路系統の走行用切換弁3
1及び他方の回路系統の走行用切換弁41のそれぞれに
も、補助バルブ65.88を設け1両方の走行用切換弁
31及び41を切換えた状態で5作業機系の7クチユエ
ータを制御するいずれかの切換弁を同時に切換えたとき
にのみ、走行優先切換弁47が切換わる構成にしている
In this second embodiment, the traveling switching valve 3 of one circuit system is
Auxiliary valves 65 and 88 are also provided for each of the traveling switching valves 41 of the circuit system 1 and the other circuit system. The travel priority switching valve 47 is configured to be switched only when the other switching valves are switched at the same time.

上記のように走行用切換弁31.41と、少なくとも作
業機系切換弁32〜34.42のいずれか1つとが同時
に切換わった状態のときだけ、走行優先切換弁47が切
換わるようにしたので、第1連通路52に、第1実施例
のようなチェック弁51が不要になる。
As described above, the travel priority switching valve 47 is switched only when the travel switching valve 31.41 and at least one of the work equipment system switching valves 32 to 34.42 are switched simultaneously. Therefore, the check valve 51 as in the first embodiment is not required in the first communication passage 52.

第3図に示した第3実施例は、パケット用切換弁42の
補助バルブ62を省略したもので、走行系アクチュエー
タとパケットシリンダとを同時に駆動させる必要がない
場合の装置である。
The third embodiment shown in FIG. 3 is a device in which the auxiliary valve 62 of the packet switching valve 42 is omitted, and there is no need to drive the traveling system actuator and the packet cylinder at the same time.

このように走行系アクチュエータとパケットシリンダと
を同時に駆動する必要がないので、この第3実施例では
、前記第1実施例における第2連通路B3が不要になる
In this way, since it is not necessary to simultaneously drive the travel system actuator and the packet cylinder, the second communication passage B3 in the first embodiment is not required in this third embodiment.

【図面の簡単な説明】[Brief explanation of drawings]

図面第1図はこの発明の第1実施例を示す回路図、第2
.3図は同じく第2,3実施例を示す回路図、第4図は
従来の装置の回路図である。 PI 、 P2・・・ポンプ、31.41・・・走行用
切換弁、32.33.34.42.43・・・作業機用
切換弁としてのブーム増速用切換弁、旋回用切換弁、ア
ーム用切換弁、パケット用切換弁、ブーム用切換弁、4
7・・・走行優先切換弁。
Figure 1 is a circuit diagram showing a first embodiment of the invention, and Figure 2 is a circuit diagram showing a first embodiment of the present invention.
.. FIG. 3 is a circuit diagram showing the second and third embodiments, and FIG. 4 is a circuit diagram of a conventional device. PI, P2... Pump, 31.41... Travel switching valve, 32.33.34.42.43... Boom speed increase switching valve as a switching valve for work equipment, swing switching valve, Switching valve for arm, switching valve for packet, switching valve for boom, 4
7... Travel priority switching valve.

Claims (1)

【特許請求の範囲】[Claims]  それぞれにポンプを接続した一対の回路系統を備え、
一方の回路系統は、作業機系のアクチュエータを制御す
る作業機用切換弁に対して走行系のアクチュエータを制
御する走行用切換弁をパラレルに接続するとともに、他
方の回路系統は、少なくとも走行用切換弁を最上流に置
いてこれをタンデム接続とし、かつ、パラレル接続側の
回路系統の走行用切換弁の上流側に走行優先切換弁を接
続し、この走行優先切換弁は、走行系のアクチュエータ
のみを動作させているときに、パラレル接続側の回路系
統の走行用切換弁に接続した供給通路を全開状態に保つ
一方、これら走行系のアクチュエータと同時に所定の作
業機系アクチュエータを動作させたときにほ切換え動作
して、上記パラレル接続側の回路系統の走行用切換弁を
タンデム接続側の回路系統の走行用切換弁に対してパラ
レル接続に切換えるように構成した建設車両の油圧装置
Equipped with a pair of circuit systems each connected to a pump,
One circuit system connects the travel switching valve that controls the travel system actuator in parallel to the work equipment switching valve that controls the work equipment system actuator, and the other circuit system connects the travel switching valve that controls the travel system actuator in parallel to the work equipment switching valve that controls the work equipment system actuator. A valve is placed at the most upstream position and connected in tandem, and a travel priority switching valve is connected upstream of the travel switching valve in the circuit system on the parallel connection side, and this travel priority switching valve is used only for the travel system actuator. When the supply passage connected to the travel selector valve of the circuit system on the parallel connection side is kept fully open while operating the travel system actuator, when the specified work equipment system actuator is operated at the same time as these travel system actuators. A hydraulic system for a construction vehicle configured to perform a switching operation to switch a traveling switching valve of the circuit system on the parallel connection side to a traveling switching valve of the circuit system on the tandem connection side to be connected in parallel.
JP60170110A 1985-08-01 1985-08-01 Hydraulic equipment for construction vehicles Expired - Fee Related JPH0694679B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60170110A JPH0694679B2 (en) 1985-08-01 1985-08-01 Hydraulic equipment for construction vehicles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60170110A JPH0694679B2 (en) 1985-08-01 1985-08-01 Hydraulic equipment for construction vehicles

Publications (2)

Publication Number Publication Date
JPS6229629A true JPS6229629A (en) 1987-02-07
JPH0694679B2 JPH0694679B2 (en) 1994-11-24

Family

ID=15898823

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60170110A Expired - Fee Related JPH0694679B2 (en) 1985-08-01 1985-08-01 Hydraulic equipment for construction vehicles

Country Status (1)

Country Link
JP (1) JPH0694679B2 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59552A (en) * 1982-06-23 1984-01-05 Nissan Motor Co Ltd Engine for automobile
JPH01174551U (en) * 1988-05-30 1989-12-12
JPH0452604U (en) * 1990-09-13 1992-05-06
JPH04146336A (en) * 1990-10-09 1992-05-20 Toshiba Mach Co Ltd Hydraulic circuit for hydraulic shovel
JP2007285520A (en) * 2006-04-18 2007-11-01 Volvo Construction Equipment Ab Straight traveling hydraulic circuit
JP2009013753A (en) * 2007-07-09 2009-01-22 Kayaba Ind Co Ltd Traveling controller of vehicle for construction machine
JP2014029189A (en) * 2012-07-31 2014-02-13 Aichi Corp Oil hydraulic operation device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS584035A (en) * 1981-06-27 1983-01-11 Hitachi Constr Mach Co Ltd Oil-pressure circuit for oil-pressure working machine
JPS59121061U (en) * 1983-02-04 1984-08-15 新キャタピラ−三菱株式会社 Hydraulic excavator hydraulic circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS584035A (en) * 1981-06-27 1983-01-11 Hitachi Constr Mach Co Ltd Oil-pressure circuit for oil-pressure working machine
JPS59121061U (en) * 1983-02-04 1984-08-15 新キャタピラ−三菱株式会社 Hydraulic excavator hydraulic circuit

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59552A (en) * 1982-06-23 1984-01-05 Nissan Motor Co Ltd Engine for automobile
JPH01174551U (en) * 1988-05-30 1989-12-12
JPH0452604U (en) * 1990-09-13 1992-05-06
JPH04146336A (en) * 1990-10-09 1992-05-20 Toshiba Mach Co Ltd Hydraulic circuit for hydraulic shovel
JP2007285520A (en) * 2006-04-18 2007-11-01 Volvo Construction Equipment Ab Straight traveling hydraulic circuit
JP2009013753A (en) * 2007-07-09 2009-01-22 Kayaba Ind Co Ltd Traveling controller of vehicle for construction machine
JP2014029189A (en) * 2012-07-31 2014-02-13 Aichi Corp Oil hydraulic operation device

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