JPH0399068U - - Google Patents

Info

Publication number
JPH0399068U
JPH0399068U JP511790U JP511790U JPH0399068U JP H0399068 U JPH0399068 U JP H0399068U JP 511790 U JP511790 U JP 511790U JP 511790 U JP511790 U JP 511790U JP H0399068 U JPH0399068 U JP H0399068U
Authority
JP
Japan
Prior art keywords
signal
hydraulic
hydraulic pump
capacity
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.)
Granted
Application number
JP511790U
Other languages
Japanese (ja)
Other versions
JPH0752201Y2 (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 JP1990005117U priority Critical patent/JPH0752201Y2/en
Publication of JPH0399068U publication Critical patent/JPH0399068U/ja
Application granted granted Critical
Publication of JPH0752201Y2 publication Critical patent/JPH0752201Y2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

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

Description

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

第１図は本考案の一実施例を示す油圧回路図、
第２図は従来例を示す油圧回路図、第３図は可変
容量油圧ポンプのＰ−ｑ線図である。 １……可変容量油圧ポンプ、２……コントロー
ルバルブ、３……走行用油圧モータ、４……アー
ム用油圧シリンダ、５……作業アタツチメント用
油圧シリンダ、６……リンク機構、７……作業用
ペダル、１０……レギユレータ（容量制限手段）
、１１……コントロールシリンダ、２０……最大
吐出容量切換制御回路（最大吐出容量切換信号出
力手段）、２１……パイロツトポンプ、２２，２
４……絞り、２３……油圧パイロツト式切換弁、
４１……電磁式切換弁（信号制御手段）、４２…
…常開スイツチ。 FIG. 1 is a hydraulic circuit diagram showing an embodiment of the present invention;
FIG. 2 is a hydraulic circuit diagram showing a conventional example, and FIG. 3 is a P-q diagram of a variable displacement hydraulic pump. 1... Variable displacement hydraulic pump, 2... Control valve, 3... Hydraulic motor for travel, 4... Hydraulic cylinder for arm, 5... Hydraulic cylinder for work attachment, 6... Link mechanism, 7... For work Pedal, 10...regulator (capacity limiting means)
, 11...Control cylinder, 20...Maximum discharge capacity switching control circuit (maximum discharge capacity switching signal output means), 21...Pilot pump, 22,2
4... Throttle, 23... Hydraulic pilot type switching valve,
41...Solenoid switching valve (signal control means), 42...
...Always open switch.

Claims (1)

【実用新案登録請求の範囲】 吐出容量可変型の油圧ポンプと、 この油圧ポンプからの圧油を制御する走行用の
第１バルブおよび非走行用の第２、第３バルブが
内蔵されたコントロールバルブと、 前記第１〜第３バルブを介して油圧ポンプから
の圧油が供給される少なくとも走行用油圧モータ
を含む油圧アクチユエータ群と、 印加される第１の信号により前記可変容量油圧
ポンプの最大吐出容量を第１の値にし、第２の信
号により前記最大吐出容量をそれよりも小さい第
２の値に制限する容量制限手段と、 前記走行用の第１バルブが中立位置から変位す
るのに応動して前記第１の信号を、非走行用の第
２、第３のバルブが中立位置から変位するのに応
動して前記第２の信号をそれぞれ出力する最大吐
出容量切換信号出力手段とを有する油圧装置にお
いて、 少なくとも前記第３バルブの操作部材の操作を
検出する検出手段と、 この検出手段が操作部材の操作を検出するとき
にそのバルブ変位に拘らず前記第１の信号を前記
容量制限手段へ印加する信号制御手段とを具備す
ることを特徴とする可変容量油圧ポンプを有する
作業機の油圧装置。[Scope of Claim for Utility Model Registration] A hydraulic pump with variable discharge capacity, and a control valve incorporating a first valve for traveling and second and third valves for non-travelling to control the pressure oil from the hydraulic pump. a group of hydraulic actuators including at least a travel hydraulic motor to which pressure oil from the hydraulic pump is supplied via the first to third valves; and a group of hydraulic actuators including at least a travel hydraulic motor; and a maximum discharge of the variable displacement hydraulic pump according to the applied first signal. capacity limiting means that sets the capacity to a first value and limits the maximum discharge capacity to a second value smaller than the maximum discharge capacity by a second signal; maximum discharge capacity switching signal output means for outputting the first signal and the second signal in response to displacement of the second and third valves for non-travel from the neutral position, respectively. In the hydraulic system, the detection means detects the operation of the operating member of at least the third valve, and when the detecting means detects the operation of the operating member, the capacity limiting means transmits the first signal regardless of the displacement of the valve. 1. A hydraulic system for a working machine having a variable displacement hydraulic pump, characterized in that the hydraulic system is equipped with a signal control means for applying a signal to the hydraulic pump.
JP1990005117U 1990-01-24 1990-01-24 Hydraulic system of working machine having variable displacement hydraulic pump Expired - Fee Related JPH0752201Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1990005117U JPH0752201Y2 (en) 1990-01-24 1990-01-24 Hydraulic system of working machine having variable displacement hydraulic pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1990005117U JPH0752201Y2 (en) 1990-01-24 1990-01-24 Hydraulic system of working machine having variable displacement hydraulic pump

Publications (2)

Publication Number Publication Date
JPH0399068U true JPH0399068U (en) 1991-10-16
JPH0752201Y2 JPH0752201Y2 (en) 1995-11-29

Family

ID=31508836

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1990005117U Expired - Fee Related JPH0752201Y2 (en) 1990-01-24 1990-01-24 Hydraulic system of working machine having variable displacement hydraulic pump

Country Status (1)

Country Link
JP (1) JPH0752201Y2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006077953A (en) * 2004-09-13 2006-03-23 Toyota Motor Corp Fastening member for magnesium alloy member, and fastening structure of magnesium alloy member using the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6258033A (en) * 1985-09-07 1987-03-13 Hitachi Constr Mach Co Ltd Construction equipment

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6258033A (en) * 1985-09-07 1987-03-13 Hitachi Constr Mach Co Ltd Construction equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006077953A (en) * 2004-09-13 2006-03-23 Toyota Motor Corp Fastening member for magnesium alloy member, and fastening structure of magnesium alloy member using the same

Also Published As

Publication number Publication date
JPH0752201Y2 (en) 1995-11-29

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees