JPS608748U - Pilot hydraulic circuit device for hydraulic construction machinery - Google Patents
Pilot hydraulic circuit device for hydraulic construction machineryInfo
- Publication number
- JPS608748U JPS608748U JP9931983U JP9931983U JPS608748U JP S608748 U JPS608748 U JP S608748U JP 9931983 U JP9931983 U JP 9931983U JP 9931983 U JP9931983 U JP 9931983U JP S608748 U JPS608748 U JP S608748U
- Authority
- JP
- Japan
- Prior art keywords
- pilot
- circuit
- pump
- hydraulic
- accumulator
- 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
Links
Landscapes
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (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
第1図は従来の液圧式建設機械のパイロット液圧回路装
置の構成説明図、第2図は本考案−実施例の構成説明図
である。
4はパイロットポンプ、39は第1方向切換弁、42は
チェック弁、44はアキュムレータ、59は第2方向切
換弁。
[1111
下−「−一
16.’tr’ l lFIG. 1 is an explanatory diagram of the configuration of a conventional pilot hydraulic circuit device for a hydraulic construction machine, and FIG. 2 is an explanatory diagram of the configuration of an embodiment of the present invention. 4 is a pilot pump, 39 is a first directional switching valve, 42 is a check valve, 44 is an accumulator, and 59 is a second directional switching valve. [1111 下-``-116.'tr' l l
Claims (1)
ボおよび作業機操作回路のメインポンプのポンプサーボ
をパイロット回路のパイロット圧で作動するようにした
ものにおいて、パイロット回路にパイロットポンプ4の
吐出圧を蓄圧するアキュムレータ44を設け、パイロッ
ト回路にアキュムレータ44のアンロード圧PF、1で
切換作動してパイロットポンプ4の吐出側をタンク21
に連通ずると共にオンロード圧PP2で作動してパイロ
ットポンプ4の吐出側をアキュムレータ44に連通ずる
第1方向切換弁39を設けると共にパイロット回路に第
1方向切換弁39側からアキュムレータ44側にのみ流
体を流すチェック弁42を設け、パイロット回路に、こ
のパイロット回路の液圧の低下によって切換作動してポ
ンプサーボ回路を閉じる第2方向切換弁59を設’tt
坊ことを特徴とする液圧式建設機械のパイロット液圧回
路装置。In a system in which the valve servo of the main valve and the pump servo of the main pump of the work equipment operating circuit are operated by the pilot pressure of the pilot circuit, the discharge pressure of the pilot pump 4 is stored in the pilot circuit. An accumulator 44 is provided in the pilot circuit to switch the discharge side of the pilot pump 4 to the tank 21 when the unload pressure PF of the accumulator 44 is 1.
A first directional switching valve 39 is provided which communicates with the accumulator 44 by operating at the on-load pressure PP2 and communicates the discharge side of the pilot pump 4 with the accumulator 44. A check valve 42 is provided to allow the flow of water, and a second directional switching valve 59 is provided in the pilot circuit, which switches when the hydraulic pressure in the pilot circuit decreases to close the pump servo circuit.
A pilot hydraulic circuit device for hydraulic construction machinery, which is characterized by a hydraulic construction machine.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9931983U JPS608748U (en) | 1983-06-29 | 1983-06-29 | Pilot hydraulic circuit device for hydraulic construction machinery |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9931983U JPS608748U (en) | 1983-06-29 | 1983-06-29 | Pilot hydraulic circuit device for hydraulic construction machinery |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS608748U true JPS608748U (en) | 1985-01-22 |
JPH0329414Y2 JPH0329414Y2 (en) | 1991-06-24 |
Family
ID=30235423
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9931983U Granted JPS608748U (en) | 1983-06-29 | 1983-06-29 | Pilot hydraulic circuit device for hydraulic construction machinery |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS608748U (en) |
-
1983
- 1983-06-29 JP JP9931983U patent/JPS608748U/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPH0329414Y2 (en) | 1991-06-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS6053681U (en) | Hydraulic circuit for steering and work equipment | |
JPS608748U (en) | Pilot hydraulic circuit device for hydraulic construction machinery | |
JPS608747U (en) | Pilot hydraulic circuit device for hydraulic construction machinery | |
JPS595599U (en) | Control circuit for clamper for forklift truck | |
JPS604654U (en) | Power shovel hydraulic circuit system | |
JPS61133102U (en) | ||
JPS58137007U (en) | Mobile agricultural machinery hydraulic system | |
JPS59102666U (en) | Hydraulic circuit for work equipment | |
JPS58109605U (en) | Work equipment hydraulic circuit | |
JPS6058661U (en) | Hydraulic circuit device for hydraulic construction machinery | |
JPS5943567U (en) | Construction machinery hydraulic circuit | |
JPS608749U (en) | Pilot hydraulic circuit device for hydraulic construction machinery | |
JPS60103073U (en) | steering circuit | |
JPS5885523U (en) | Hydraulic drive vehicle control circuit | |
JPS61103584U (en) | ||
JPS59139602U (en) | Work equipment drive circuit device | |
JPS60151963U (en) | Construction machinery hydraulic circuit | |
JPS60494U (en) | Excavator hydraulic circuit | |
JPS58170379U (en) | Speed control circuit for cranes, etc. | |
JPS59102667U (en) | Hydraulic circuit for work equipment | |
JPS5877157U (en) | Concrete pump operation control device | |
JPS5875286U (en) | Hydraulic crane winch hydraulic control circuit | |
JPS58123903U (en) | hydraulic control circuit | |
JPS6062559U (en) | Hydraulic breaker attachment device for work trolley | |
JPS6012703U (en) | Control circuit for hydraulic motor for travel |