JPH01137348U - - Google Patents

Info

Publication number
JPH01137348U
JPH01137348U JP3314288U JP3314288U JPH01137348U JP H01137348 U JPH01137348 U JP H01137348U JP 3314288 U JP3314288 U JP 3314288U JP 3314288 U JP3314288 U JP 3314288U JP H01137348 U JPH01137348 U JP H01137348U
Authority
JP
Japan
Prior art keywords
switching valve
boom
valve
hydraulic circuit
boom cylinder
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
Application number
JP3314288U
Other languages
Japanese (ja)
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 JP3314288U priority Critical patent/JPH01137348U/ja
Publication of JPH01137348U publication Critical patent/JPH01137348U/ja
Pending legal-status Critical Current

Links

Description

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

第１図ａ，ｂ，ｃはこの考案の一実施例であつ
てａはブーム上昇工程で大きいピストンロツド押
力を必要とする時、ｂはピストン早送りの状態、
ｃはブーム下降時を示し、第２図はホイールロー
ダの側面図、第３図は従来のもの、第４図ａ，ｂ
はバケツト歯先軌跡、ヒンジピン高さ及びピスト
ンロツド押力の関係を示す説明図である。 １…ブーム、６…ブームシリンダ、６１Ｂ…ボ
トム側、６１Ｒ…ロツド側、６２…ピストン、６
３…ピストンロツド、７０…ブームコントロール
バルブ、８０…バイロツト操作チエツク弁、９０
…電磁切換弁、９５…ブーム角度センサ、９６…
コントローラ。 Figures 1a, b, and c show one embodiment of this invention, in which a is a state in which a large piston rod pushing force is required in the boom raising process, b is a state in which the piston is in rapid traverse,
c shows the boom when it is lowered, Fig. 2 is a side view of the wheel loader, Fig. 3 is the conventional one, Fig. 4 a, b
is an explanatory diagram showing the relationship among bucket tip locus, hinge pin height, and piston rod pushing force. 1...Boom, 6...Boom cylinder, 61B...bottom side, 61R...rod side, 62...piston, 6
3...Piston rod, 70...Boom control valve, 80...Bi-rot operation check valve, 90
...Solenoid switching valve, 95...Boom angle sensor, 96...
controller.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 建設機械の作業機のブームシリンダの油圧回路
において、ブームシリンダのロツド側から排出さ
れる油を油圧ポンプからの油に加えてボトム側へ
導く切換弁と、ブームヒンジピン高さを検知して
該切換弁に切換信号を出すコントローラとを設け
たことを特徴とする作業機油圧回路。 In the hydraulic circuit of the boom cylinder of a construction machine, there is a switching valve that adds oil discharged from the rod side of the boom cylinder to the oil from the hydraulic pump and directs it to the bottom side, and a switching valve that detects the height of the boom hinge pin and switches the switching valve. A hydraulic circuit for a work machine, characterized in that the valve is provided with a controller that issues a switching signal.
JP3314288U 1988-03-15 1988-03-15 Pending JPH01137348U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3314288U JPH01137348U (en) 1988-03-15 1988-03-15

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3314288U JPH01137348U (en) 1988-03-15 1988-03-15

Publications (1)

Publication Number Publication Date
JPH01137348U true JPH01137348U (en) 1989-09-20

Family

ID=31259801

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3314288U Pending JPH01137348U (en) 1988-03-15 1988-03-15

Country Status (1)

Country Link
JP (1) JPH01137348U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010210072A (en) * 2009-03-12 2010-09-24 Sumitomo (Shi) Construction Machinery Co Ltd Hydraulic control system for working machine
JP2010230061A (en) * 2009-03-26 2010-10-14 Sumitomo (Shi) Construction Machinery Co Ltd Hydraulic control circuit for construction machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010210072A (en) * 2009-03-12 2010-09-24 Sumitomo (Shi) Construction Machinery Co Ltd Hydraulic control system for working machine
JP2010230061A (en) * 2009-03-26 2010-10-14 Sumitomo (Shi) Construction Machinery Co Ltd Hydraulic control circuit for construction machine

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