JPS62169057U - - Google Patents
Info
- Publication number
- JPS62169057U JPS62169057U JP5789986U JP5789986U JPS62169057U JP S62169057 U JPS62169057 U JP S62169057U JP 5789986 U JP5789986 U JP 5789986U JP 5789986 U JP5789986 U JP 5789986U JP S62169057 U JPS62169057 U JP S62169057U
- Authority
- JP
- Japan
- Prior art keywords
- hydraulic
- switching valve
- relief valve
- swing
- 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.)
- Pending
Links
- 238000010276 construction Methods 0.000 claims 1
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Description
第１図は本考案の油圧シヨベルの油圧回路の実
施例を示す回路図、第２図および第３図は従来の
油圧シヨベルの油圧回路の例を示す回路図である
。
１……第１の油圧ポンプ、２……第２の油圧ポ
ンプ、３〜８……方向切換弁、９，１０……メイ
ンリリーフ弁、１１……旋回用アクチユエータ、
１２〜１４……アクチユエータ、１５〜１６……
走行用アクチユエータ、１７，１８……クロスリ
リーフ弁、１９〜２４……過負荷リリーフ弁。
FIG. 1 is a circuit diagram showing an embodiment of a hydraulic circuit for a hydraulic shovel according to the present invention, and FIGS. 2 and 3 are circuit diagrams showing examples of a hydraulic circuit for a conventional hydraulic shovel. DESCRIPTION OF SYMBOLS 1... First hydraulic pump, 2... Second hydraulic pump, 3-8... Directional switching valve, 9, 10... Main relief valve, 11... Turning actuator,
12-14... Actuator, 15-16...
Traveling actuator, 17, 18...Cross relief valve, 19-24...Overload relief valve.
Claims (1)
の圧油によつて駆動する複数のアクチユエータと
、上記油圧ポンプから上記アクチユエータに供給
される圧油の方向および流量を制御する複数の方
向切換弁と、方向切換弁の上流にメインリリーフ
弁を備えた土木・建設用機械の油圧回路において
、旋回、アーム、ブーム、バケツト用切換弁の少
くとも一つと一側走行用切換弁を第１の油圧ポン
プに接続し、第２の油圧ポンプに他側走行用切換
弁を接続し、旋回用切換弁のアクチユエータ接続
口にはメインリリーフ弁より低い圧力に設定した
クロスリリーフ弁を、アーム、ブーム、バケツト
用切換弁のアクチユエータ接続口にはメインリリ
ーフ弁よりも低い圧力に設定した過負荷リリーフ
弁をそれぞれ設けたことを特徴とする油圧シヨベ
ルの油圧回路。 a plurality of hydraulic pumps, a plurality of actuators driven by pressure oil from these hydraulic pumps, and a plurality of directional switching valves that control the direction and flow rate of the pressure oil supplied from the hydraulic pumps to the actuator; In a hydraulic circuit of a civil engineering/construction machine equipped with a main relief valve upstream of a directional switching valve, at least one of the switching valves for swing, arm, boom, and bucket and the switching valve for one-sided travel are used as the first hydraulic pump. Connect the switching valve for travel on the other side to the second hydraulic pump, connect the cross relief valve set to a lower pressure than the main relief valve to the actuator connection port of the switching valve for swing, and connect the switching valve for arm, boom, and bucket to the actuator connection port of the swing switching valve. A hydraulic circuit for a hydraulic excavator, characterized in that each of the actuator connection ports of the valves is provided with an overload relief valve set at a pressure lower than that of the main relief valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5789986U JPS62169057U (en) | 1986-04-17 | 1986-04-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5789986U JPS62169057U (en) | 1986-04-17 | 1986-04-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62169057U true JPS62169057U (en) | 1987-10-27 |
Family
ID=30888015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5789986U Pending JPS62169057U (en) | 1986-04-17 | 1986-04-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62169057U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5880033A (en) * | 1981-11-02 | 1983-05-14 | Kobe Steel Ltd | Oil hydraulic circuit for oil hydraulic shovel |
| JPS62189224A (en) * | 1986-02-17 | 1987-08-19 | Kato Seisakusho:Kk | Oil-pressure circuit for shovel |
-
1986
- 1986-04-17 JP JP5789986U patent/JPS62169057U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5880033A (en) * | 1981-11-02 | 1983-05-14 | Kobe Steel Ltd | Oil hydraulic circuit for oil hydraulic shovel |
| JPS62189224A (en) * | 1986-02-17 | 1987-08-19 | Kato Seisakusho:Kk | Oil-pressure circuit for shovel |
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