JPH0185502U - - Google Patents
Info
- Publication number
- JPH0185502U JPH0185502U JP18213487U JP18213487U JPH0185502U JP H0185502 U JPH0185502 U JP H0185502U JP 18213487 U JP18213487 U JP 18213487U JP 18213487 U JP18213487 U JP 18213487U JP H0185502 U JPH0185502 U JP H0185502U
- Authority
- JP
- Japan
- Prior art keywords
- valve
- circuit
- tank
- pilot
- actuator
- 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
Links
- 238000010276 construction Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Description
第１図は本考案にかかる建設機械（パワーシヨ
ベル等）のパイロツト油圧回路図、第２図は本考
案が適用されたポンプ吐出馬力と作業サイクルの
関係図、第３図は従来のポンプ吐出馬力とサイク
ルの関係図である。
１……パイロツトポンプ、２……タンク、３，
４，６……回路、５……リリーフバルブ、７……
チエツクバルブ、８……アキユームレータ、９…
…セフテイロツクバルブ、１０……コントロール
バルブ、１１Ａ，１１Ｂ，１１Ｃ……主ポンプ、
１２Ａ，１２Ｂ，１２Ｃ……方向切換弁、１３Ａ
，１３Ｂ，１３Ｃ……主回路、１４……アンロー
ドバルブ。
Figure 1 is a pilot hydraulic circuit diagram of a construction machine (such as a power shovel) according to the present invention, Figure 2 is a diagram showing the relationship between the pump discharge horsepower and work cycle to which the present invention is applied, and Figure 3 is the relationship between the conventional pump discharge horsepower and the work cycle. It is a relationship diagram of a cycle. 1... Pilot pump, 2... Tank, 3,
4, 6...Circuit, 5...Relief valve, 7...
Check valve, 8... Accumulator, 9...
...Safety lock valve, 10...Control valve, 11A, 11B, 11C...Main pump,
12A, 12B, 12C... Directional switching valve, 13A
, 13B, 13C...Main circuit, 14...Unload valve.
Claims (1)
を途中で分岐して一方の回路４にはリリーフバル
ブ５を設け、他方の回路６にはチエツクバルブ７
、アキユームレータ８、セフテイロツクバルブ９
およびコントロールバルブ１０、その他を順に設
けてそれぞれタンクへ戻すようにするとともに、
前記コントロールバルブは、主ポンプ１１から方
向切換弁１２を介して作業機を作動するアクチユ
エータに至る主回路１３の方向切換弁をパイロツ
ト圧により行うようにしたパイロツト油圧回路に
おいて、前記チエツクバルブとアキユームレータ
との間に、パイロツト圧が一定圧以上のときに開
となつてタンクへ戻るアンロードバルブ１４を設
けたことを特徴とする建設機械の油圧回路。 Circuit 3 from pilot pump 1 to tank 2
is branched in the middle, one circuit 4 is provided with a relief valve 5, and the other circuit 6 is provided with a check valve 7.
, accumulator 8, safety lock valve 9
and control valve 10, and others are provided in order to return each to the tank,
The control valve is connected to the check valve and the actuator in a pilot hydraulic circuit in which the directional switching valve of the main circuit 13 from the main pump 11 to the actuator that operates the work machine via the directional switching valve 12 is operated by pilot pressure. A hydraulic circuit for a construction machine, characterized in that an unload valve 14 is provided between the mulator and the unload valve 14, which opens and returns to the tank when the pilot pressure is above a certain pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18213487U JPH0185502U (en) | 1987-11-30 | 1987-11-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18213487U JPH0185502U (en) | 1987-11-30 | 1987-11-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0185502U true JPH0185502U (en) | 1989-06-07 |
Family
ID=31473588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18213487U Pending JPH0185502U (en) | 1987-11-30 | 1987-11-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0185502U (en) |
-
1987
- 1987-11-30 JP JP18213487U patent/JPH0185502U/ja active Pending