JPH0329551U - - Google Patents
Info
- Publication number
- JPH0329551U JPH0329551U JP8741989U JP8741989U JPH0329551U JP H0329551 U JPH0329551 U JP H0329551U JP 8741989 U JP8741989 U JP 8741989U JP 8741989 U JP8741989 U JP 8741989U JP H0329551 U JPH0329551 U JP H0329551U
- Authority
- JP
- Japan
- Prior art keywords
- center bypass
- switching valve
- bypass type
- arm
- hydraulic circuit
- 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
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
Description
第１図は本考案に係る油圧シヨベルの油圧回路
の一実施例を示す油圧回路図、第２図は本考案に
係る油圧シヨベルの油圧回路の別の実施例を示す
油圧回路図、第３図は本考案に係る油圧シヨベル
の油圧回路の更に別の実施例を示す油圧回路図、
第４図は本考案に係る油圧シヨベルの油圧回路に
おける第２の単位油圧回路の上流側（ブーム用）
センタバイパス型方向切換弁を示す油圧回路図で
ある。
１０…第１の可変容量ポンプ、１２…第１の単
位油圧回路、１４…第２の可変容量ポンプ、１６
…第２の単位油圧回路、１８…ポンプ吐出油供給
路、２０…アーム用センタバイパス型方向切換弁
、２２…センタバイパス、２４…第１のパイロツ
ト圧発生手段、２６…供給路、２８…シリンダポ
ート管路、３０…アームシリンダ、３２…パイロ
ツトライン、３４…ネガテイブレギユレータ、３
６…ポンプ吐出油路供給路、３８…ブーム用セン
タバイパス型方向切換弁、４０…センタバイパス
、４２…アーム用センタバイパス型合流方向切換
弁、４４…センタバイパス型流量切換弁、４６…
第２のパイロツト圧発生手段、４８…供給路、５
０…シリンダポート管路、５２…ブームシリンダ
、５４…供給路、５６…合流管路、５８，６６…
操作弁、６０，６２，６８…パイロツトライン、
６４…ネガテイブレギユレータ、７０…センタバ
イパス型合流切換弁、７２…チエツク弁、７４…
合流管路、７６…センタバイパス型切換弁、７８
…ブーム用センタバイパス型方向切換弁、７８ａ
…切換位置、８０…センタバイパス通路。
FIG. 1 is a hydraulic circuit diagram showing one embodiment of the hydraulic circuit of a hydraulic excavator according to the present invention, FIG. 2 is a hydraulic circuit diagram showing another embodiment of the hydraulic circuit of a hydraulic excavator according to the present invention, and FIG. is a hydraulic circuit diagram showing yet another embodiment of the hydraulic circuit of the hydraulic excavator according to the present invention,
Figure 4 shows the upstream side (for boom) of the second unit hydraulic circuit in the hydraulic circuit of the hydraulic excavator according to the present invention.
FIG. 2 is a hydraulic circuit diagram showing a center bypass type directional control valve. 10...First variable displacement pump, 12...First unit hydraulic circuit, 14...Second variable displacement pump, 16
...Second unit hydraulic circuit, 18...Pump discharge oil supply path, 20...Center bypass type directional switching valve for arm, 22...Center bypass, 24...First pilot pressure generating means, 26...Supply path, 28...Cylinder Port pipe line, 30... Arm cylinder, 32... Pilot line, 34... Negative regulator, 3
6... Pump discharge oil path supply path, 38... Center bypass type directional switching valve for boom, 40... Center bypass, 42... Center bypass type merging directional switching valve for arm, 44... Center bypass type flow rate switching valve, 46...
Second pilot pressure generating means, 48...supply path, 5
0... Cylinder port pipe line, 52... Boom cylinder, 54... Supply line, 56... Merging pipe line, 58, 66...
Operation valve, 60, 62, 68...pilot line,
64... Negative regulator, 70... Center bypass type merging switching valve, 72... Check valve, 74...
Merging pipe line, 76...Center bypass type switching valve, 78
...Center bypass type directional valve for boom, 78a
...Switching position, 80...Center bypass passage.
補正 平２．９．６ 図面の簡単な説明を次のように補正する。 図面に第１６図を別紙の通り追加する。Correction: Heisei 2.9.6 The brief description of the drawing has been amended as follows. Figure 16 is added to the drawings as shown in the attached sheet.
Claims (1)
る第１の単位油圧回路と第２の可変容量ポンプの
吐出油が供給される第２の単位油圧回路とからな
り、 前記第１の単位油圧回路には、ポンプ吐出油供
給路に接続されてアームシリンダを操作するアー
ム用センタバイパス型方向切換弁と、その下流側
センタバイパスに接続されて前記第１の可変容量
ポンプの吐出量を制御する第１のパイロツト圧発
生手段とを設け、 前記第２の単位油圧回路には、ポンプ吐出油供
給路に接続されてブームシリンダを操作するブー
ム用センタバイパス型方向切換弁と、その下流側
センタバイパスに接続されてブリード流量を前記
アーム用センタバイパス型方向切換弁に合流する
アーム用センタバイパス型合流制御弁手段と、そ
の下流側センタバイパスに接続され前記ブーム用
センタバイパス型方向切換弁の操作信号に連動し
てセンタバイパスを絞るセンタバイパス型流量切
換弁と、その下流側センタバイパスに接続されて
前記第２の可変容量ポンプの吐出量を制御する第
２のパイロツト圧発生手段とを設けることを特徴
とする油圧シヨベルの油圧回路。 (2) アーム用センタバイパス型合流制御弁手段
は、センタバイパス型合流方向切換弁から構成し
、このアーム用センタバイパス型合流方向切換弁
のシリンダポート管路とアーム用センタバイパス
型方向切換弁のシリンダポート管路との間を合流
管路を介して接続する請求項１記載の油圧シヨベ
ルの油圧回路。 (3) アーム用センタバイパス型合流制御弁手段
は、センタバイパス型合流切換弁から構成し、こ
のアーム用センタバイパス型合流切換弁の上流側
センタバイパスとアーム用センタバイパス型方向
切換弁への供給路との間をチエツク弁を介在した
合流管路を介して接続する請求項１記載の油圧シ
ヨベルの油圧回路。 (4) アーム用センタバイパス型合流制御弁手段
とセンタバイパス型流量切換弁とを共通のセンタ
バイパス型切換弁で構成し、このセンタバイパス
型切換弁の上流側センタバイパスとアーム用セン
タバイパス型方向切換弁への供給路との間をチエ
ツク弁を介在した合流管路を介して接続する請求
項１記載の油圧シヨベルの油圧回路。 (5) ブーム用センタバイパス型方向切換弁は、
そのブームシリンダ伸長操作におけるストローク
エンド状態においてセンタバイパス通路が締切ら
れないよう構成される請求項１記載の油圧シヨベ
ルの油圧回路。[Claims for Utility Model Registration] (1) A first unit hydraulic circuit to which the discharge oil of the first variable displacement pump is supplied and a second unit hydraulic circuit to which the discharge oil of the second variable displacement pump is supplied. The first unit hydraulic circuit includes an arm center bypass type directional switching valve connected to the pump discharge oil supply path to operate the arm cylinder, and the first unit hydraulic circuit connected to the downstream center bypass of the arm center bypass type directional switching valve. a first pilot pressure generating means for controlling the discharge amount of the variable displacement pump, and the second unit hydraulic circuit includes a boom center bypass type unit connected to the pump discharge oil supply path to operate the boom cylinder. a directional switching valve; an arm center bypass type merging control valve means connected to the downstream center bypass for merging the bleed flow rate to the arm center bypass type directional switching valve; a center bypass flow rate switching valve that throttles the center bypass in conjunction with an operation signal of the center bypass type directional switching valve; and a second valve connected to the center bypass on the downstream side thereof and controlling the discharge amount of the second variable displacement pump A hydraulic circuit for a hydraulic excavator, characterized in that a pilot pressure generating means is provided. (2) The center bypass type merging control valve means for the arm is composed of a center bypass type merging direction switching valve, and the cylinder port conduit of the center bypass type merging direction switching valve for the arm and the center bypass type directional switching valve for the arm are connected to each other. The hydraulic circuit for a hydraulic excavator according to claim 1, wherein the hydraulic circuit is connected to the cylinder port pipe through a confluence pipe. (3) The center bypass type merging control valve means for the arm is composed of a center bypass type merging switching valve, and the supply is supplied to the upstream center bypass of the center bypass type merging switching valve for the arm and to the center bypass type directional switching valve for the arm. 2. The hydraulic circuit for a hydraulic excavator according to claim 1, wherein the hydraulic circuit is connected to the hydraulic excavator via a confluence pipe with a check valve interposed therebetween. (4) The center bypass type merging control valve means for the arm and the center bypass type flow rate switching valve are constituted by a common center bypass type switching valve, and the upstream side center bypass and the center bypass type direction for the arm of the center bypass type switching valve are configured. 2. The hydraulic circuit for a hydraulic excavator according to claim 1, wherein the supply path to the switching valve is connected via a confluence pipe line with a check valve interposed therebetween. (5) Center bypass type directional valve for boom:
2. The hydraulic circuit for a hydraulic excavator according to claim 1, wherein the center bypass passage is configured not to be closed at a stroke end state in the boom cylinder extension operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8741989U JPH0732603Y2 (en) | 1989-07-27 | 1989-07-27 | Hydraulic circuit of hydraulic excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8741989U JPH0732603Y2 (en) | 1989-07-27 | 1989-07-27 | Hydraulic circuit of hydraulic excavator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0329551U true JPH0329551U (en) | 1991-03-25 |
| JPH0732603Y2 JPH0732603Y2 (en) | 1995-07-26 |
Family
ID=31637065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8741989U Expired - Fee Related JPH0732603Y2 (en) | 1989-07-27 | 1989-07-27 | Hydraulic circuit of hydraulic excavator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0732603Y2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100886475B1 (en) * | 2007-03-12 | 2009-03-05 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | Hydraulic join circuit of construction machine |
| JP2011085198A (en) * | 2009-10-15 | 2011-04-28 | Hitachi Constr Mach Co Ltd | Hydraulic system for operating machine |
| JP2012149554A (en) * | 2011-01-18 | 2012-08-09 | Hitachi Constr Mach Co Ltd | Traveling drive circuit device for wheel type traveling working vehicle |
-
1989
- 1989-07-27 JP JP8741989U patent/JPH0732603Y2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100886475B1 (en) * | 2007-03-12 | 2009-03-05 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | Hydraulic join circuit of construction machine |
| JP2011085198A (en) * | 2009-10-15 | 2011-04-28 | Hitachi Constr Mach Co Ltd | Hydraulic system for operating machine |
| JP2012149554A (en) * | 2011-01-18 | 2012-08-09 | Hitachi Constr Mach Co Ltd | Traveling drive circuit device for wheel type traveling working vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0732603Y2 (en) | 1995-07-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |