JPH01124859U - - Google Patents
Info
- Publication number
- JPH01124859U JPH01124859U JP2085688U JP2085688U JPH01124859U JP H01124859 U JPH01124859 U JP H01124859U JP 2085688 U JP2085688 U JP 2085688U JP 2085688 U JP2085688 U JP 2085688U JP H01124859 U JPH01124859 U JP H01124859U
- Authority
- JP
- Japan
- Prior art keywords
- hydraulic
- switching valve
- signal
- pressure oil
- main pump
- 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
- Operation Control Of Excavators (AREA)
- Forklifts And Lifting Vehicles (AREA)
- Fluid-Pressure Circuits (AREA)
Description
第１図はこの考案にかかるクローラ式油圧シヨ
ベルにおける電気・油圧回路の系統図、第２図は
この考案の他の実施例を示す要部電気・油圧系統
図、第３図は従来のクローラ式油圧シヨベルの油
圧系統図である。
４，５……走行用油圧切換弁、６，７，８，９
，１０，１１……油圧切換弁、１２，１３，１４
，１５，１６，１７，１８，１９……副切換弁、
２０，４４……パイロツト作動切換弁、４１……
電磁開閉弁、４２……スイツチ、４６……圧力ス
イツチ、４８……小切換弁。
Fig. 1 is a system diagram of the electric/hydraulic circuit in the crawler type hydraulic excavator according to this invention, Fig. 2 is a main part electric/hydraulic system diagram showing another embodiment of this invention, and Fig. 3 is a conventional crawler type hydraulic excavator. It is a hydraulic system diagram of a hydraulic excavator. 4, 5...Hydraulic switching valve for traveling, 6, 7, 8, 9
, 10, 11... Hydraulic switching valve, 12, 13, 14
, 15, 16, 17, 18, 19... Sub-switching valve,
20, 44... Pilot operation switching valve, 41...
Electromagnetic on-off valve, 42... switch, 46... pressure switch, 48... small switching valve.
Claims (1)
連なる左右の走行用油圧切換弁と、該走行用油圧
切換弁のそれぞれの下流側にパラレル回路でもつ
て配置した複数の作業装置用の油圧切換弁と、走
行用油圧切換弁および作業装置用の油圧切換弁と
を同時に操作したときにのみ信号を発生する手段
と、該信号によつて切換わる切換弁とを有する油
圧シヨベルの油圧回路において、該切換弁の受信
部に信号が作用しないときは、一方のメインポン
プの吐出圧油を該切換弁を介して上記一方の走行
用油圧切換弁に通じさせ、他方の走行用油圧切換
弁に通じる他方のメインポンプの吐出圧油管路の
分岐管路を閉路し、受信部に信号が作用すると該
切換弁が切換わり、一方のメインポンプの吐出圧
油を左右の走行用油圧切換弁の下流側の作業装置
用の油圧切換弁に、他方のメインポンプの吐出圧
油を前記分岐管路と切換弁を介し、および直接、
左右の走行用油圧切換弁に通じさせる如き管路を
設けるとともに、運転席近くの操作手段で得られ
る前記信号を発生する手段と同種の信号を、上記
切換弁の受信部に導いたことを特徴とする油圧シ
ヨベルの油圧回路。 Two main pumps, left and right traveling hydraulic switching valves connected to their respective discharge pipes, and hydraulic switching valves for multiple working devices arranged in parallel circuits downstream of each of the traveling hydraulic switching valves. In a hydraulic circuit for a hydraulic excavator, the hydraulic excavator has a means for generating a signal only when a traveling hydraulic switching valve and a working equipment hydraulic switching valve are simultaneously operated, and a switching valve that is switched in response to the signal. When the signal does not act on the receiving part of the switching valve, the pressure oil discharged from one main pump is passed through the switching valve to one of the traveling hydraulic switching valves, and the other is connected to the other traveling hydraulic switching valve. The branch pipe of the discharge pressure oil pipe of the main pump is closed, and when a signal acts on the receiving part, the switching valve is switched, and the discharge pressure oil of one main pump is transferred to the downstream side of the left and right traveling hydraulic pressure switching valves. The pressure oil discharged from the other main pump is supplied to the hydraulic switching valve for the working equipment via the branch pipe and the switching valve, and directly.
It is characterized in that a conduit is provided to communicate with the left and right travel hydraulic pressure switching valves, and a signal of the same type as the means for generating the signal obtained by the operating means near the driver's seat is guided to the receiving part of the switching valve. Hydraulic circuit of a hydraulic excavator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988020856U JPH0649644Y2 (en) | 1988-02-18 | 1988-02-18 | Hydraulic circuit of crawler type hydraulic excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988020856U JPH0649644Y2 (en) | 1988-02-18 | 1988-02-18 | Hydraulic circuit of crawler type hydraulic excavator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01124859U true JPH01124859U (en) | 1989-08-25 |
| JPH0649644Y2 JPH0649644Y2 (en) | 1994-12-14 |
Family
ID=31237582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988020856U Expired - Lifetime JPH0649644Y2 (en) | 1988-02-18 | 1988-02-18 | Hydraulic circuit of crawler type hydraulic excavator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0649644Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012067509A (en) * | 2010-09-24 | 2012-04-05 | Nippon Sharyo Seizo Kaisha Ltd | Hydraulic working machine and method of increasing output |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61142235A (en) * | 1984-12-17 | 1986-06-30 | Sumitomo Heavy Ind Ltd | Oil-pressure circuit for construction machine such as oil-pressure shovel |
-
1988
- 1988-02-18 JP JP1988020856U patent/JPH0649644Y2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61142235A (en) * | 1984-12-17 | 1986-06-30 | Sumitomo Heavy Ind Ltd | Oil-pressure circuit for construction machine such as oil-pressure shovel |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012067509A (en) * | 2010-09-24 | 2012-04-05 | Nippon Sharyo Seizo Kaisha Ltd | Hydraulic working machine and method of increasing output |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0649644Y2 (en) | 1994-12-14 |
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