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
Application number
JP9096788U
Other languages
Japanese (ja)
Other versions
JPH0634444Y2 (en
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP9096788U priority Critical patent/JPH0634444Y2/en
Publication of JPH0215661U publication Critical patent/JPH0215661U/ja
Application granted granted Critical
Publication of JPH0634444Y2 publication Critical patent/JPH0634444Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)

Description

【図面の簡単な説明】[Brief explanation of the drawing]

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)

【実用新案登録請求の範囲】[Scope of utility model registration request] 2台の主油圧ポンプを備え、第1の主油圧ポン
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.
JP9096788U 1988-07-11 1988-07-11 Hydraulic circuit of hydraulic excavator Expired - Lifetime JPH0634444Y2 (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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