JPS62148657U - - Google Patents
Info
- Publication number
- JPS62148657U JPS62148657U JP3660486U JP3660486U JPS62148657U JP S62148657 U JPS62148657 U JP S62148657U JP 3660486 U JP3660486 U JP 3660486U JP 3660486 U JP3660486 U JP 3660486U JP S62148657 U JPS62148657 U JP S62148657U
- Authority
- JP
- Japan
- Prior art keywords
- hydraulic
- oil
- hydraulic pumps
- switching
- valve
- 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)
Description
第１図は、本考案実施例を示す建設機械の油圧
回路図、第２図は、バツクホーの全体側面図、第
３図はバツクホーのバルブ台周りの前面図、第４
図は第３図―線による断面図、第５図はバツ
クホーのカウンタウエイト取付状態説明図である
。
図中、１……選択切換弁、２，３，４，５……
各作業機のアクチユエータ、６，９，１０……油
圧ポンプ、７……パイロツト圧油路、８……シヤ
トル弁。
Fig. 1 is a hydraulic circuit diagram of a construction machine showing an embodiment of the present invention, Fig. 2 is an overall side view of a backhoe, Fig. 3 is a front view of the valve stand of the backhoe, and Fig. 4 is a hydraulic circuit diagram of a construction machine showing an embodiment of the present invention.
The figure is a sectional view taken along the line of FIG. 3, and FIG. 5 is an explanatory diagram of the counterweight installed state of the backhoe. In the figure, 1... selection switching valve, 2, 3, 4, 5...
Actuator of each work machine, 6, 9, 10...hydraulic pump, 7...pilot pressure oil path, 8...shuttle valve.
Claims (1)
圧ポンプ６，９，１０等からの圧油を各作業機２
，３，４，５等へ供給するようにした油圧回路に
おいて、 上記油圧回路の途中に、前記一部の油圧ポンプ
６，９からの圧油を複数の作業機２，３，４，５
へ選択的に供給できる選択切換弁１を設けるとと
もに、該選択切換弁１を大量の油量を必要とする
大容量作業側へ切り換えたとき、該選択切換弁１
の切り換え動作に連動して、上記一部の油圧ポン
プ６，９以外の他の一又は複数の油圧ポンプ１０
等からの圧油をも合流させて、該大容量作業へ供
給するよう切り換わるシヤトル弁８を設け、さら
に、同シヤトル弁８に、切換過渡期において油圧
ポンプ１０をいずれかの油圧回路と連通させる過
渡期オープン回路を設けるとともに、選択切換弁
１に、油圧ポンプ１０と連絡するポートを油圧タ
ンク４５と連通するバイパス回路を設けたことを
特徴とする建設機械の油圧装置。[Scope of Claim for Utility Model Registration] A plurality of hydraulic pumps 6, 9, 10, etc. are provided, and pressure oil from the hydraulic pumps 6, 9, 10, etc. is supplied to each work machine 2.
, 3, 4, 5, etc., in the middle of the hydraulic circuit, pressure oil from some of the hydraulic pumps 6, 9 is supplied to a plurality of working machines 2, 3, 4, 5, etc.
A selection changeover valve 1 is provided that can selectively supply oil to the oil tank, and when the selection changeover valve 1 is switched to a large capacity work side that requires a large amount of oil, the selection changeover valve 1
In conjunction with the switching operation, one or more hydraulic pumps 10 other than the above-mentioned part of the hydraulic pumps 6 and 9
A shuttle valve 8 is provided which switches to combine pressure oil from other sources and supply it to the large-capacity work, and further communicates a hydraulic pump 10 with one of the hydraulic circuits during the switching transition period to the shuttle valve 8. A hydraulic system for construction machinery, characterized in that a transition period open circuit is provided to allow the switching to occur, and a bypass circuit is provided in the selection switching valve 1 to communicate a port communicating with the hydraulic pump 10 with a hydraulic tank 45.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3660486U JPH0447260Y2 (en) | 1986-03-12 | 1986-03-12 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3660486U JPH0447260Y2 (en) | 1986-03-12 | 1986-03-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62148657U true JPS62148657U (en) | 1987-09-19 |
| JPH0447260Y2 JPH0447260Y2 (en) | 1992-11-09 |
Family
ID=30847163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3660486U Expired JPH0447260Y2 (en) | 1986-03-12 | 1986-03-12 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0447260Y2 (en) |
-
1986
- 1986-03-12 JP JP3660486U patent/JPH0447260Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0447260Y2 (en) | 1992-11-09 |
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