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
- 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
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 |
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