JPS6298689U - - Google Patents
Info
- Publication number
- JPS6298689U JPS6298689U JP18992685U JP18992685U JPS6298689U JP S6298689 U JPS6298689 U JP S6298689U JP 18992685 U JP18992685 U JP 18992685U JP 18992685 U JP18992685 U JP 18992685U JP S6298689 U JPS6298689 U JP S6298689U
- Authority
- JP
- Japan
- Prior art keywords
- pump
- swing
- flow rate
- swing operation
- circuit
- 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
- 238000010276 construction Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Description
第１図は本考案の実施例を示す油圧回路図、第
２図は別の実施例を示す油圧回路図である。
１…第１のポンプ、２…第２のポンプ、４…旋
回用方向制御弁、５…旋回モータ、７…ロード切
替弁、７ａ…第１の電磁切替弁、８…タンク、１
０…旋回用操作弁、１５…ポンプ（操作用油圧源
）、１８…フエザリング制御用パイロツト切替弁
、２８…第２の電磁切替弁、２４，２６…流量制
御部。
FIG. 1 is a hydraulic circuit diagram showing an embodiment of the present invention, and FIG. 2 is a hydraulic circuit diagram showing another embodiment. DESCRIPTION OF SYMBOLS 1...First pump, 2...Second pump, 4...Swivel direction control valve, 5...Swivel motor, 7...Load switching valve, 7a...First electromagnetic switching valve, 8...Tank, 1
0...Swivel operation valve, 15...Pump (hydraulic source for operation), 18...Pilot switching valve for feathering control, 28...Second electromagnetic switching valve, 24, 26...Flow rate control section.
Claims (1)
し、この２個のポンプのうち少なくとも第２のポ
ンプが可変ポンプであり、第１のポンプは旋回回
路に接続され、第２のポンプの吐出側は、旋回操
作時に第２のポンプを第１のポンプと合流させか
つ旋回の非操作時に第２のポンプをアンロードさ
せる切替手段を介して旋回回路に接続され、第２
のポンプの流量制御部に、旋回操作時に第２のポ
ンプの吐出流量を大きくする方向に制御しかつ旋
回の非操作時に第２のポンプの吐出流量を最小に
する制御手段が設けられていることを特徴とする
建設機械の旋回油圧回路。 It has two pumps driven by an engine, at least a second pump of the two pumps is a variable pump, the first pump is connected to the swirl circuit, and the discharge of the second pump is The side is connected to the swing circuit via a switching means that causes the second pump to merge with the first pump during the swing operation and unloads the second pump when the swing is not operated;
The flow rate control unit of the pump is provided with a control means for controlling the discharge flow rate of the second pump in a direction to increase it during the swing operation and minimizing the discharge flow rate of the second pump when the swing operation is not performed. A swing hydraulic circuit for construction machinery featuring:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985189926U JPH0412078Y2 (en) | 1985-12-09 | 1985-12-09 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985189926U JPH0412078Y2 (en) | 1985-12-09 | 1985-12-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6298689U true JPS6298689U (en) | 1987-06-23 |
| JPH0412078Y2 JPH0412078Y2 (en) | 1992-03-25 |
Family
ID=31142665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985189926U Expired JPH0412078Y2 (en) | 1985-12-09 | 1985-12-09 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0412078Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010242306A (en) * | 2009-04-01 | 2010-10-28 | Takeuchi Seisakusho:Kk | Hydraulic control device for construction machinery |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5523042U (en) * | 1978-07-31 | 1980-02-14 | ||
| JPS57165537A (en) * | 1981-04-07 | 1982-10-12 | Hitachi Constr Mach Co Ltd | Rotary oil-pressure circuit for construction machinery |
| JPS58174704A (en) * | 1982-04-07 | 1983-10-13 | Uchida Yuatsu Kiki Kogyo Kk | Flow control method in confluence circuit |
| JPS5941532A (en) * | 1982-09-02 | 1984-03-07 | Hitachi Constr Mach Co Ltd | Oil-pressure circuit for slewing operation |
-
1985
- 1985-12-09 JP JP1985189926U patent/JPH0412078Y2/ja not_active Expired
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5523042U (en) * | 1978-07-31 | 1980-02-14 | ||
| JPS57165537A (en) * | 1981-04-07 | 1982-10-12 | Hitachi Constr Mach Co Ltd | Rotary oil-pressure circuit for construction machinery |
| JPS58174704A (en) * | 1982-04-07 | 1983-10-13 | Uchida Yuatsu Kiki Kogyo Kk | Flow control method in confluence circuit |
| JPS5941532A (en) * | 1982-09-02 | 1984-03-07 | Hitachi Constr Mach Co Ltd | Oil-pressure circuit for slewing operation |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010242306A (en) * | 2009-04-01 | 2010-10-28 | Takeuchi Seisakusho:Kk | Hydraulic control device for construction machinery |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0412078Y2 (en) | 1992-03-25 |
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