JPH0379369U - - Google Patents
Info
- Publication number
- JPH0379369U JPH0379369U JP10654490U JP10654490U JPH0379369U JP H0379369 U JPH0379369 U JP H0379369U JP 10654490 U JP10654490 U JP 10654490U JP 10654490 U JP10654490 U JP 10654490U JP H0379369 U JPH0379369 U JP H0379369U
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- pilot
- valve
- pilot pressure
- suspension lock
- 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
- 239000000725 suspension Substances 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 3
Description
第１図は上部旋回式油圧掘削機の正面図、第２
図は前面図、第３図はその油圧回路図の従来例を
示す線図的構成説明図、第４図は本考案の実施例
を示す油圧回路図である。
Ｐ１，Ｐ２……ポンプ、５……走行モータ、５
ａ……正転ポート、５ｂ……逆転ポート、８，９
……吐出路、１７，１８……可変リリーフ弁、２
０……サスペンシヨンロツク弁、２４……パイロ
ツト弁、２５，２６……管路。
Figure 1 is a front view of the upper swing type hydraulic excavator, Figure 2
The figure is a front view, FIG. 3 is a diagrammatic configuration explanatory diagram showing a conventional example of the hydraulic circuit diagram, and FIG. 4 is a hydraulic circuit diagram showing an embodiment of the present invention. P 1 , P 2 ... Pump, 5 ... Travel motor, 5
a...Forward rotation port, 5b...Reverse rotation port, 8, 9
...Discharge path, 17, 18...Variable relief valve, 2
0...Suspension lock valve, 24...Pilot valve, 25, 26...Pipe line.
Claims (1)
１の操作弁を経て油圧掘削機のシリンダに供給し
、第２の操作弁で走行モータ５の正転ポート５ａ
、逆転ポート５ｂに供給するようにした油圧回路
において、 前記吐出路８，９に、パイロツト圧力が作用し
ないとセツト圧力が低く、パイロツト圧力が作用
するとセツト圧力が高くなるセツト圧力可変の可
変リリーフ弁１７，１８を設け、 該可変リリーフ弁１７，１８にパイロツト圧力
を供給するパイロツト管路２３を、前記走行モー
タ５の正転ポート５ａに接続する管路２５と逆転
ポート５ｂに接続する管路２６の圧力差で切換え
作動して高圧側の管路２５又は２６に接続するパ
イロツト弁２４を設け、 下部走行体から上部旋回体に伝播する振動を吸
収する一対のサスペンシヨンシリンダ７，７のそ
れぞれの室７ａ，７ａを不連続とするロツク位置
と連通する非ロツク位置とに切換えられるサスペ
ンシヨンロツク弁２０を設け、該サスペンシヨン
ロツク弁２０をパイロツト圧力が作用しないとロ
ツク位置となり、パイロツト圧力が作用すると非
ロツク位置となるようにし、 このサスペンシヨンロツク弁２０にパイロツト
圧を供給するパイツト管路２２を前記パイロツト
管路２３に接続したことを特徴とする上部旋回式
油圧掘削機の油圧回路。[Claims for Utility Model Registration] The pressure oil in the discharge passages 8 and 9 of the pumps P 1 and P 2 is supplied to the cylinder of the hydraulic excavator through the first operation valve, and the second operation valve is used to supply the pressure oil to the cylinder of the hydraulic excavator. normal rotation port 5a
, in a hydraulic circuit configured to supply to the reversing port 5b, a variable relief valve with a variable set pressure in which the set pressure is low when no pilot pressure is applied to the discharge passages 8 and 9, and the set pressure is high when the pilot pressure is applied. 17, 18, a pilot line 23 for supplying pilot pressure to the variable relief valves 17, 18 is connected to the forward rotation port 5a of the travel motor 5, and a line 26 is connected to the reverse rotation port 5b. A pilot valve 24 is provided, which is switched and operated by a pressure difference between A suspension lock valve 20 is provided which can be switched between a lock position in which the chambers 7a and 7a are discontinuous and an unlock position in which they communicate with each other, and the suspension lock valve 20 is in the lock position when no pilot pressure is applied, and the suspension lock valve 20 is in the lock position when no pilot pressure is applied. A hydraulic circuit for an upper swing type hydraulic excavator, characterized in that a pilot pipe line 22 for supplying pilot pressure to the suspension lock valve 20 is connected to the pilot pipe line 23 so that the suspension lock valve 20 is in an unlocked position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10654490U JPH0379369U (en) | 1990-10-12 | 1990-10-12 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10654490U JPH0379369U (en) | 1990-10-12 | 1990-10-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0379369U true JPH0379369U (en) | 1991-08-13 |
Family
ID=31655275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10654490U Pending JPH0379369U (en) | 1990-10-12 | 1990-10-12 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0379369U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013021692A1 (en) * | 2011-08-08 | 2013-02-14 | 株式会社小松製作所 | Backhoe loader |
-
1990
- 1990-10-12 JP JP10654490U patent/JPH0379369U/ja active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013021692A1 (en) * | 2011-08-08 | 2013-02-14 | 株式会社小松製作所 | Backhoe loader |
| JP2013036220A (en) * | 2011-08-08 | 2013-02-21 | Komatsu Ltd | Backhoe loader |
| US8483917B2 (en) | 2011-08-08 | 2013-07-09 | Komatsu Ltd. | Backhoe loader |
| GB2496763B (en) * | 2011-08-08 | 2013-10-23 | Komatsu Mfg Co Ltd | Backhoe Loader |
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