JPH01119445U - - Google Patents
Info
- Publication number
- JPH01119445U JPH01119445U JP1119588U JP1119588U JPH01119445U JP H01119445 U JPH01119445 U JP H01119445U JP 1119588 U JP1119588 U JP 1119588U JP 1119588 U JP1119588 U JP 1119588U JP H01119445 U JPH01119445 U JP H01119445U
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- hydraulic
- cylinder
- bucket
- hydraulic excavator
- 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
- 239000010720 hydraulic oil Substances 0.000 claims 2
- 239000003921 oil Substances 0.000 claims 2
- 230000036461 convulsion Effects 0.000 claims 1
- 239000000725 suspension Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- 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図ないし第４図は
それぞれ本考案の他の実施例を示す回路図、第５
図は油圧シヨベルの側面図、第６図は従来の油圧
シヨベルの油圧回路を示す回路図である。
FIG. 1 is a circuit diagram showing one embodiment of the hydraulic circuit of a hydraulic excavator according to the present invention, FIGS. 2 to 4 are circuit diagrams showing other embodiments of the present invention, and FIG.
The figure is a side view of a hydraulic excavator, and FIG. 6 is a circuit diagram showing a hydraulic circuit of a conventional hydraulic excavator.
Claims (1)
作動油を供給する管路と油タンクとの間に、バケ
ツトを着地した状態でブームシリンダを収縮させ
た場合における車体のジヤツキアツプが不可能と
なる圧力を設定する低圧リリーフ弁を、切換装置
によつて作動可能状態となるように挿入した構成
を有する油圧シヨベルの油圧回路。 ２ 前記切換装置が、アームシリンダあるいはバ
ケツトシリンダの操作信号によつて低圧リリーフ
弁を作動可能状態とする切換弁からなる請求項１
記載の油圧シヨベルの油圧回路。 ３ 油圧シヨベルのブームシリンダのロツド室に
作動油を供給する管路と油タンクとの間に、バケ
ツトを着地した状態でブームシリンダを収縮させ
た場合における車体のジヤツキアツプが可能とな
る高リリーフ圧と、前記ジヤツキアツプが不可能
となる低リリーフ圧を設定可能な可変リリーフ弁
を設け、該可変リリーフ弁は、アームシリンダあ
るいはバケツトシリンダの操作信号によつてリリ
ーフ圧が前記低リリーフ圧に設定される構成を有
する油圧シヨベルの油圧回路。[Scope of Claim for Utility Model Registration] 1. Between the pipe line that supplies hydraulic oil to the rod chamber of the boom cylinder of a hydraulic excavator and the oil tank, there is a provision for the suspension of the vehicle body when the boom cylinder is retracted while the bucket is on the ground. A hydraulic circuit for a hydraulic excavator having a configuration in which a low-pressure relief valve that sets a pressure that makes it impossible to operate is inserted so that it can be operated by a switching device. 2. Claim 1, wherein the switching device comprises a switching valve that enables the low pressure relief valve to operate in response to an operation signal from an arm cylinder or a bucket cylinder.
Hydraulic circuit of the hydraulic excavator described. 3 A high relief pressure is installed between the pipe line that supplies hydraulic oil to the rod chamber of the boom cylinder of the hydraulic excavator and the oil tank to enable the vehicle body to jerk up when the boom cylinder is retracted while the bucket is on the ground. , a variable relief valve capable of setting a low relief pressure at which the jack up is impossible is provided, and the relief pressure of the variable relief valve is set to the low relief pressure by an operation signal of an arm cylinder or a bucket cylinder. A hydraulic circuit of a hydraulic excavator having the following configuration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1119588U JPH01119445U (en) | 1988-02-01 | 1988-02-01 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1119588U JPH01119445U (en) | 1988-02-01 | 1988-02-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01119445U true JPH01119445U (en) | 1989-08-14 |
Family
ID=31219533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1119588U Pending JPH01119445U (en) | 1988-02-01 | 1988-02-01 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01119445U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0577344U (en) * | 1992-03-19 | 1993-10-22 | セイレイ工業株式会社 | Arm regulation structure for small turning type power shovel |
| WO1996006988A1 (en) * | 1994-08-30 | 1996-03-07 | Komatsu Ltd. | Hydraulic circuit for boom cylinder of hydraulic shovel |
| JP2009180065A (en) * | 2008-02-01 | 2009-08-13 | Caterpillar Japan Ltd | Working machine controller |
| JP2010112559A (en) * | 2009-12-25 | 2010-05-20 | Yanmar Co Ltd | Direction selector valve for working vehicle |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62188689A (en) * | 1986-02-12 | 1987-08-18 | 日立建機株式会社 | Hydraulic controller for working machine |
| JPS62224702A (en) * | 1986-03-26 | 1987-10-02 | Yutani Heavy Ind Ltd | Variably operating system for hydraulic actuator |
-
1988
- 1988-02-01 JP JP1119588U patent/JPH01119445U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62188689A (en) * | 1986-02-12 | 1987-08-18 | 日立建機株式会社 | Hydraulic controller for working machine |
| JPS62224702A (en) * | 1986-03-26 | 1987-10-02 | Yutani Heavy Ind Ltd | Variably operating system for hydraulic actuator |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0577344U (en) * | 1992-03-19 | 1993-10-22 | セイレイ工業株式会社 | Arm regulation structure for small turning type power shovel |
| WO1996006988A1 (en) * | 1994-08-30 | 1996-03-07 | Komatsu Ltd. | Hydraulic circuit for boom cylinder of hydraulic shovel |
| US5855159A (en) * | 1994-08-30 | 1999-01-05 | Komatsu Ltd. | Hydraulic circuit for a boom cylinder in a hydraulic shovel |
| JP2009180065A (en) * | 2008-02-01 | 2009-08-13 | Caterpillar Japan Ltd | Working machine controller |
| JP2010112559A (en) * | 2009-12-25 | 2010-05-20 | Yanmar Co Ltd | Direction selector valve for working vehicle |
| JP4585607B2 (en) * | 2009-12-25 | 2010-11-24 | ヤンマー株式会社 | Work vehicle direction switching valve |
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