JPH02145307U - - Google Patents
Info
- Publication number
- JPH02145307U JPH02145307U JP5346089U JP5346089U JPH02145307U JP H02145307 U JPH02145307 U JP H02145307U JP 5346089 U JP5346089 U JP 5346089U JP 5346089 U JP5346089 U JP 5346089U JP H02145307 U JPH02145307 U JP H02145307U
- Authority
- JP
- Japan
- Prior art keywords
- line
- pilot
- hydraulic pilot
- valves
- branch line
- 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
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Description
第１図は本考案の油圧回路図、第２図は従来例
の油圧回路図、第３図および第４図は他の実施例
の回路図である。
１：アクチユエータ、２：慣性負荷、３：チエ
ツク付リリーフ弁、４：コントロールバルブ、５
：チエツク弁、６：操作レバー、７，８：油圧パ
イロツト弁、９：タンクライン、１０：タンク、
１１，１２：パイロツトライン、１３：リリーフ
弁、１４：メインポンプ、１５：サブポンプ、１
６：オイルクーラ、１７，１８：切換弁、１９，
２０：分岐パイロツトライン、２１：ドレンライ
ン、２２：分岐ライン、２３：入れ替え油供給源
、２４：切換弁、２５：電磁切換弁、２６：圧力
スイツチ。
FIG. 1 is a hydraulic circuit diagram of the present invention, FIG. 2 is a hydraulic circuit diagram of a conventional example, and FIGS. 3 and 4 are circuit diagrams of other embodiments. 1: Actuator, 2: Inertial load, 3: Relief valve with check, 4: Control valve, 5
: Check valve, 6: Operation lever, 7, 8: Hydraulic pilot valve, 9: Tank line, 10: Tank,
11, 12: Pilot line, 13: Relief valve, 14: Main pump, 15: Sub pump, 1
6: Oil cooler, 17, 18: Switching valve, 19,
20: branch pilot line, 21: drain line, 22: branch line, 23: replacement oil supply source, 24: switching valve, 25: electromagnetic switching valve, 26: pressure switch.
Claims (1)
ライン２２をドレンライン２１又は油圧パイロツ
トライン１１，１２に選択的に切換接続可能な切
換弁１７，１８を設け、前記切換弁１７，１８は
常時は分岐ライン２２をドレンライン２１に連通
させ、油圧パイロツト弁７，８のレバー６を操作
したときは、その操作信号を受けて切り換わり、
前記分岐ライン２２をパイロツト操作の戻り側ラ
イン１１又は１２に接続すると共に、コントロー
ルバルブ４と切換弁１７又は１８間の戻り側パイ
ロツトライン１１ａ又は１２ａをドレンライン２
１に接続させることを特徴とするシヨベル等の油
圧パイロツト回路。 Switching valves 17 and 18 are provided that can selectively connect a branch line 22 branched from the replacement oil supply source line 23 to the drain line 21 or the hydraulic pilot lines 11 and 12, and the switching valves 17 and 18 are normally connected to the branch line. 22 is connected to the drain line 21, and when the levers 6 of the hydraulic pilot valves 7 and 8 are operated, they are switched in response to the operation signal.
The branch line 22 is connected to the pilot operation return line 11 or 12, and the return side pilot line 11a or 12a between the control valve 4 and the switching valve 17 or 18 is connected to the drain line 2.
A hydraulic pilot circuit for a shovel, etc., characterized in that it is connected to 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5346089U JP2513795Y2 (en) | 1989-05-11 | 1989-05-11 | Hydraulic control circuit for construction machinery such as hydraulic excavators |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5346089U JP2513795Y2 (en) | 1989-05-11 | 1989-05-11 | Hydraulic control circuit for construction machinery such as hydraulic excavators |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02145307U true JPH02145307U (en) | 1990-12-10 |
| JP2513795Y2 JP2513795Y2 (en) | 1996-10-09 |
Family
ID=31574663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5346089U Expired - Lifetime JP2513795Y2 (en) | 1989-05-11 | 1989-05-11 | Hydraulic control circuit for construction machinery such as hydraulic excavators |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2513795Y2 (en) |
-
1989
- 1989-05-11 JP JP5346089U patent/JP2513795Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2513795Y2 (en) | 1996-10-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |