JPH0175604U - - Google Patents

Info

Publication number
JPH0175604U
JPH0175604U JP1987170098U JP17009887U JPH0175604U JP H0175604 U JPH0175604 U JP H0175604U JP 1987170098 U JP1987170098 U JP 1987170098U JP 17009887 U JP17009887 U JP 17009887U JP H0175604 U JPH0175604 U JP H0175604U
Authority
JP
Japan
Prior art keywords
valve
pilot
port
connects
bypass passage
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
JP1987170098U
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 JP1987170098U priority Critical patent/JPH0175604U/ja
Publication of JPH0175604U publication Critical patent/JPH0175604U/ja
Pending legal-status Critical Current

Links

Description

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

第１図は本考案の建設機械用油圧駆動装置の一
実施例を示す油圧回路図である。第２図は従来の
建設機械用油圧駆動装置の油圧回路図である。 FIG. 1 is a hydraulic circuit diagram showing an embodiment of the hydraulic drive device for construction machinery of the present invention. FIG. 2 is a hydraulic circuit diagram of a conventional hydraulic drive system for construction machinery.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 中立位置においてパイロツトをバイパスさせる
通路をもつパイロツト操作形の方向切換弁と、パ
イロツトポンプと、パイロツトポンプにつながれ
たアキユムレータと、パイロツトポンプとアキユ
ムレータとの間に接続された逆止め弁と、逆止め
弁の下流側に接続されているパイロツト操作弁と
を具備し、方向切換弁がパイロツトポートをパイ
ロツト操作弁につながれ、バイパス通路の出口側
ポートを油タンクにつながれ、バイパス通路の入
口側ポートを逆止め弁の上流側につながれている
建設機械用油圧駆動装置において、方向切換弁に
おけるバイパス通路の入口側ポートが逆止め弁の
上流側につながれていることを特徴としている建
設機械用油圧駆動装置。 A pilot-operated directional valve having a passage that bypasses the pilot in a neutral position, a pilot pump, an accumulator connected to the pilot pump, a check valve connected between the pilot pump and the accumulator, and a check valve. and a pilot operating valve connected to the downstream side of the valve, the directional control valve connects the pilot port to the pilot operating valve, connects the outlet side port of the bypass passage to the oil tank, and connects the inlet side port of the bypass passage to a non-returning valve. A hydraulic drive system for construction machinery connected to the upstream side of a valve, characterized in that an inlet port of a bypass passage in the directional control valve is connected to the upstream side of the check valve.
JP1987170098U 1987-11-09 1987-11-09 Pending JPH0175604U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1987170098U JPH0175604U (en) 1987-11-09 1987-11-09

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1987170098U JPH0175604U (en) 1987-11-09 1987-11-09

Publications (1)

Publication Number Publication Date
JPH0175604U true JPH0175604U (en) 1989-05-23

Family

ID=31460738

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1987170098U Pending JPH0175604U (en) 1987-11-09 1987-11-09

Country Status (1)

Country Link
JP (1) JPH0175604U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994018399A1 (en) * 1993-02-09 1994-08-18 Hitachi Construction Machinery Co., Ltd. Hydraulic driving device for a construction machine
JP2010144840A (en) * 2008-12-19 2010-07-01 Ube Machinery Corporation Ltd Extrusion press

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994018399A1 (en) * 1993-02-09 1994-08-18 Hitachi Construction Machinery Co., Ltd. Hydraulic driving device for a construction machine
JP2010144840A (en) * 2008-12-19 2010-07-01 Ube Machinery Corporation Ltd Extrusion press

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