JPS616556U - Hydraulic excavator hydraulic circuit - Google Patents

Hydraulic excavator hydraulic circuit

Info

Publication number
JPS616556U
JPS616556U JP8862284U JP8862284U JPS616556U JP S616556 U JPS616556 U JP S616556U JP 8862284 U JP8862284 U JP 8862284U JP 8862284 U JP8862284 U JP 8862284U JP S616556 U JPS616556 U JP S616556U
Authority
JP
Japan
Prior art keywords
hydraulic pump
hydraulic
excavator
displacement hydraulic
circuit
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
JP8862284U
Other languages
Japanese (ja)
Other versions
JPH0352274Y2 (en
Inventor
亘 久保本
公雄 市川
Original Assignee
油谷重工株式会社
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 by 油谷重工株式会社 filed Critical 油谷重工株式会社
Priority to JP8862284U priority Critical patent/JPS616556U/en
Publication of JPS616556U publication Critical patent/JPS616556U/en
Application granted granted Critical
Publication of JPH0352274Y2 publication Critical patent/JPH0352274Y2/ja
Granted legal-status Critical Current

Links

Landscapes

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

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【図面の簡単な説明】 第１図は本考案の実施例の油圧回路図、第２図は本考案
の他の実施例の油圧回路図、第３図はパイロット圧力と
ポンプ吐出量との関係を示す図である。 １・・・可変容量型油圧ポンプ、２・・・可変容量型油
圧ポンプ、３・・・吐出量制御室、４・・・吐出量制御
室、５・・・エンジン、６・・・コントロール弁、７−
・・コントロール弁、１０・・・固定容量型油圧ポンプ
、１４・・・切換弁、１５・・・チェック弁、１６・・
・チェック永[Brief explanation of the drawings] Figure 1 is a hydraulic circuit diagram of an embodiment of the present invention, Figure 2 is a hydraulic circuit diagram of another embodiment of the present invention, and Figure 3 is the relationship between pilot pressure and pump discharge amount. FIG. DESCRIPTION OF SYMBOLS 1... Variable displacement hydraulic pump, 2... Variable displacement hydraulic pump, 3... Discharge amount control room, 4... Discharge amount control room, 5... Engine, 6... Control valve , 7-
...Control valve, 10...Fixed capacity hydraulic pump, 14...Switching valve, 15...Check valve, 16...
・Check length

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 油圧ショベルのコントロール弁とこれに通スル可変容量
型油圧ポンプ、および、該油圧ポンプの吐出量制御室に
コントロール弁と固定容量型油圧ポンプからパイロット
油路を形成したネガティブ型の可変容量型油圧ポンプの
制御回路において、固定容量型油圧ポンプの吐出側回路
に可変容量型油圧ポンプの始動時にのみ開通するための
切換弁、および、その下流側にチェック弁を設けたこと
よりなる油圧ショベルの油圧回路。A control valve of a hydraulic excavator, a variable displacement hydraulic pump that passes through the control valve, and a negative variable displacement hydraulic pump in which a pilot oil passage is formed from the control valve and the fixed displacement hydraulic pump in the discharge volume control chamber of the hydraulic pump. In the control circuit of a hydraulic excavator, a control circuit of a hydraulic excavator is provided with a switching valve in the discharge side circuit of a fixed displacement hydraulic pump to open only when a variable displacement hydraulic pump is started, and a check valve downstream of the switching valve. .
JP8862284U 1984-06-13 1984-06-13 Hydraulic excavator hydraulic circuit Granted JPS616556U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8862284U JPS616556U (en) 1984-06-13 1984-06-13 Hydraulic excavator hydraulic circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8862284U JPS616556U (en) 1984-06-13 1984-06-13 Hydraulic excavator hydraulic circuit

Publications (2)

Publication Number Publication Date
JPS616556U true JPS616556U (en) 1986-01-16
JPH0352274Y2 JPH0352274Y2 (en) 1991-11-12

Family

ID=30641932

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8862284U Granted JPS616556U (en) 1984-06-13 1984-06-13 Hydraulic excavator hydraulic circuit

Country Status (1)

Country Link
JP (1) JPS616556U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013531207A (en) * 2010-06-30 2013-08-01 ボルボ コンストラクション イクイップメント アーベー Hydraulic pump control device for construction machinery

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54162801A (en) * 1978-06-14 1979-12-24 Hitachi Construction Machinery Oil pressure circuit of oil pressure shovel

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54162801A (en) * 1978-06-14 1979-12-24 Hitachi Construction Machinery Oil pressure circuit of oil pressure shovel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013531207A (en) * 2010-06-30 2013-08-01 ボルボ コンストラクション イクイップメント アーベー Hydraulic pump control device for construction machinery

Also Published As

Publication number Publication date
JPH0352274Y2 (en) 1991-11-12

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