JPH0215661U - - Google Patents
Info
- Publication number
- JPH0215661U JPH0215661U JP9096788U JP9096788U JPH0215661U JP H0215661 U JPH0215661 U JP H0215661U JP 9096788 U JP9096788 U JP 9096788U JP 9096788 U JP9096788 U JP 9096788U JP H0215661 U JPH0215661 U JP H0215661U
- Authority
- JP
- Japan
- Prior art keywords
- control valve
- hydraulic
- circuit
- valve
- travel
- 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
- 238000011144 upstream manufacturing Methods 0.000 claims 4
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Description
第１図は本考案による油圧シヨベルの油圧回路
の一実施例を示す回路図、第２図は従来の油圧シ
ヨベルの油圧回路図である。
FIG. 1 is a circuit diagram showing an embodiment of the hydraulic circuit of a hydraulic excavator according to the present invention, and FIG. 2 is a hydraulic circuit diagram of a conventional hydraulic excavator.
Claims (1)
プの吐出回路には、一方の走行用油圧モータ用第
１のコントロール弁を最上流側として、フロント
アクチユエータを含む複数のアクチユエータ用コ
ントロール弁が縦続接続され、第２の主油圧ポン
プの吐出回路には、他方の走行用油圧モータ用第
２のコントロール弁を最下流側として、フロント
アクチユエータを含む複数のアクチユエータ用コ
ントロール弁が縦続接続され、かつ、前記第１の
コントロール弁の上流側ポンプ回路と、前記第２
のコントロール弁の上流側ポンプ回路とを、両回
路を連通、遮断させる２位置切換弁でなる走行直
進弁を介して接続してなる油圧シヨベルの油圧回
路において、前記第１のコントロール弁が非操作
状態にある場合に前記走行直進弁の連通側への切
換えを禁止する回路を設けたことを特徴とする油
圧シヨベルの油圧回路。 Equipped with two main hydraulic pumps, the discharge circuit of the first main hydraulic pump has controls for a plurality of actuators including the front actuator, with the first control valve for one of the hydraulic motors for traveling being the most upstream side. The valves are connected in cascade, and in the discharge circuit of the second main hydraulic pump, a plurality of control valves for actuators including the front actuator are connected in cascade, with the other second control valve for the travel hydraulic motor being the most downstream side. connected to an upstream pump circuit of the first control valve, and a pump circuit on the upstream side of the first control valve;
In the hydraulic circuit of the hydraulic excavator, the first control valve is connected to the upstream pump circuit of the control valve via a straight-travel valve, which is a two-position switching valve that communicates and cuts off both circuits, when the first control valve is inoperable. 1. A hydraulic circuit for a hydraulic excavator, characterized in that a circuit is provided for prohibiting switching of the straight-travel valve to a communication side when the straight-travel valve is in the above-mentioned state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9096788U JPH0634444Y2 (en) | 1988-07-11 | 1988-07-11 | Hydraulic circuit of hydraulic excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9096788U JPH0634444Y2 (en) | 1988-07-11 | 1988-07-11 | Hydraulic circuit of hydraulic excavator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0215661U true JPH0215661U (en) | 1990-01-31 |
| JPH0634444Y2 JPH0634444Y2 (en) | 1994-09-07 |
Family
ID=31315470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9096788U Expired - Lifetime JPH0634444Y2 (en) | 1988-07-11 | 1988-07-11 | Hydraulic circuit of hydraulic excavator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0634444Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002181004A (en) * | 2000-12-11 | 2002-06-26 | Yanmar Diesel Engine Co Ltd | Selector valve for boom cylinder of excavating and turning work vehicle |
-
1988
- 1988-07-11 JP JP9096788U patent/JPH0634444Y2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002181004A (en) * | 2000-12-11 | 2002-06-26 | Yanmar Diesel Engine Co Ltd | Selector valve for boom cylinder of excavating and turning work vehicle |
| JP4532725B2 (en) * | 2000-12-11 | 2010-08-25 | ヤンマー株式会社 | Directional switching valve for excavating and turning work vehicle boom |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0634444Y2 (en) | 1994-09-07 |
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