JPS63130556U - - Google Patents
Info
- Publication number
- JPS63130556U JPS63130556U JP2025887U JP2025887U JPS63130556U JP S63130556 U JPS63130556 U JP S63130556U JP 2025887 U JP2025887 U JP 2025887U JP 2025887 U JP2025887 U JP 2025887U JP S63130556 U JPS63130556 U JP S63130556U
- Authority
- JP
- Japan
- Prior art keywords
- oil passage
- valve
- pilot
- travel
- pump
- 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
- 230000007935 neutral effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Description
第１図および第２図はこの考案にかかる油圧回
路図、第３図はこの考案の他実施例油圧回路図、
第４図は従来技術の油圧回路図である。
１Ｌ，１Ｒ……左右走行モータ、３，４，５…
…油圧シリンダ、６，６′……第１ポンプ、７，
７′，９，９′……レギユレータ、８，８′……
油圧ポンプ、１６……走行直進弁、１８……開閉
弁、４４Ｌ，４４Ｒ……パイロツト切換弁、６２
Ｌ，６２Ｒ，６７Ｌ，６７Ｒ……昇圧型リリーフ
弁。
Figures 1 and 2 are hydraulic circuit diagrams according to this invention, Figure 3 is a hydraulic circuit diagram of another embodiment of this invention,
FIG. 4 is a hydraulic circuit diagram of the prior art. 1L, 1R...Left and right travel motor, 3, 4, 5...
...Hydraulic cylinder, 6, 6'...First pump, 7,
7', 9, 9'...regulator, 8,8'...
Hydraulic pump, 16... Straight travel valve, 18... Open/close valve, 44L, 44R... Pilot switching valve, 62
L, 62R, 67L, 67R...boost type relief valve.
Claims (1)
タを２個のグループＡ，Ｂに分け、左右走行弁を
各グループの最前列にそれぞれ設け、これと他の
アクチユエータ切換弁をすべて並列に配置し、ま
た、第１、第２ポンプ吐出側油路に走行直進弁を
設け、一方、左走行モータと左走行弁とを連通す
る油路に左走行モータと並列に開閉弁を設け、そ
の開閉弁を左右走行モータ停止時にはリモコン弁
よりのパイロツト油路を遮断し、左右走行モータ
作動時にはパイロツト油路を開通するようにして
、パイロツトポンプからのリモコン用パイロツト
圧を上記走行直進弁のパイロツト圧受圧部へ作用
可能とし、左右走行弁がともに中立かあるいは左
右走行弁のみ同時操作位置の第１の場合には第１
ポンプよりの油路を遮断して第２ポンプよりの油
路を開通し、また、左右走行弁とその他いずれか
のアクチユエータ切換弁が中立位置以外の操作位
置にある第２の場合には第１および第２ポンプよ
りの油路を並列開通油路位置に切換可能とした油
圧回路において、グループＡ，Ｂ内の作業アタツ
チメント用切換弁の圧油供給側油路とセンタバイ
パス下流側油路との間に昇圧型リリーフ弁および
タンク連通用パイロツト切換弁を直列にそれぞれ
設けるとともに、その各昇圧型リリーフ弁の昇圧
パイロツト圧受圧部と各パイロツト切換弁のパイ
ロツト圧受圧部を上記走行直進弁のパイロツト圧
受圧部に連通し、構成していることを特徴とする
油圧シヨベルの油圧回路。 The various hydraulic actuators installed in the hydraulic excavator are divided into two groups A and B, and left and right travel valves are provided in the front row of each group, and all other actuator switching valves are arranged in parallel. , a straight travel valve is provided in the oil passage on the second pump discharge side, and an on-off valve is provided in parallel with the left travel motor in the oil passage that communicates the left travel motor and the left travel valve, and the on-off valve is used to stop the left and right travel motors. At times, the pilot oil passage from the remote control valve is shut off, and when the left and right travel motors are operated, the pilot oil passage is opened, so that the pilot pressure for the remote control from the pilot pump can be applied to the pilot pressure receiving portion of the straight travel valve, If the left and right travel valves are both neutral or only the left and right travel valves are in the simultaneously operated position, the first
The oil passage from the pump is shut off and the oil passage from the second pump is opened. In a hydraulic circuit in which the oil passage from the second pump can be switched to the parallel open oil passage position, the pressure oil supply side oil passage of the work attachment switching valve in groups A and B and the center bypass downstream oil passage are connected. A step-up relief valve and a pilot switching valve for tank communication are provided in series between them, and the step-up pilot pressure receiving part of each boosting type relief valve and the pilot pressure receiving part of each pilot switching valve are connected to the pilot pressure of the straight travel valve. A hydraulic circuit for a hydraulic excavator characterized by communicating with a pressure receiving part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2025887U JPH0624448Y2 (en) | 1987-02-14 | 1987-02-14 | Hydraulic circuit of hydraulic shovel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2025887U JPH0624448Y2 (en) | 1987-02-14 | 1987-02-14 | Hydraulic circuit of hydraulic shovel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63130556U true JPS63130556U (en) | 1988-08-26 |
| JPH0624448Y2 JPH0624448Y2 (en) | 1994-06-29 |
Family
ID=30815605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2025887U Expired - Lifetime JPH0624448Y2 (en) | 1987-02-14 | 1987-02-14 | Hydraulic circuit of hydraulic shovel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0624448Y2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03144024A (en) * | 1989-10-31 | 1991-06-19 | Komatsu Ltd | Hydraulic circuit of hydraulic drilling machine |
| JPH08134959A (en) * | 1994-11-08 | 1996-05-28 | Samsung Heavy Ind Co Ltd | Heavy-duty straightly running apparatus |
-
1987
- 1987-02-14 JP JP2025887U patent/JPH0624448Y2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03144024A (en) * | 1989-10-31 | 1991-06-19 | Komatsu Ltd | Hydraulic circuit of hydraulic drilling machine |
| JPH08134959A (en) * | 1994-11-08 | 1996-05-28 | Samsung Heavy Ind Co Ltd | Heavy-duty straightly running apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0624448Y2 (en) | 1994-06-29 |
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