JPS57201434A - Oil-pressure circuit for hydraulic shovel - Google Patents
Oil-pressure circuit for hydraulic shovelInfo
- Publication number
- JPS57201434A JPS57201434A JP8510681A JP8510681A JPS57201434A JP S57201434 A JPS57201434 A JP S57201434A JP 8510681 A JP8510681 A JP 8510681A JP 8510681 A JP8510681 A JP 8510681A JP S57201434 A JPS57201434 A JP S57201434A
- Authority
- JP
- Japan
- Prior art keywords
- oil
- control valve
- turning
- pressure
- pressure 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
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2292—Systems with two or more pumps
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
PURPOSE:To enhance the turning controllability of an oil-pressure pump by using a system in which a turning control valve and a main control valve are connected in parallel to an oil-pressure pump and the turning control valve is controlled by operating a lever. CONSTITUTION:A main control valve 4 and a turning control valve 5 are connected in parallel to an oil-pressure pump P2, and the turning control valve 5 is directly connected to a turning motor M2. When operating a lever 61 in the direction of arrow (a), the discharge oil of the oil-pressure pump P2 flows into the turning motor M2 through the direction control valve 51 of the turning control valve 5. At this time, the discharge oil of the oil-pressure pump P2 flows even into the main control valve 4, where the pressure of the discharge oil is raised up to a pressure corresponding to set pressure for a variable sequence valve 42 and by the pressure, turning is accelerated. Whereupon, the set pressure of the variable sequence valve 42 is controlled by the operating angle of the lever 61 and by the set pressure, the discharge pressure of the oil-pressure pump P2 is controlled. With said mechanism, the torque when the turning is accelerated is controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8510681A JPS57201434A (en) | 1981-06-02 | 1981-06-02 | Oil-pressure circuit for hydraulic shovel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8510681A JPS57201434A (en) | 1981-06-02 | 1981-06-02 | Oil-pressure circuit for hydraulic shovel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57201434A true JPS57201434A (en) | 1982-12-09 |
| JPS6238497B2 JPS6238497B2 (en) | 1987-08-18 |
Family
ID=13849356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8510681A Granted JPS57201434A (en) | 1981-06-02 | 1981-06-02 | Oil-pressure circuit for hydraulic shovel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57201434A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6188008A (en) * | 1984-10-08 | 1986-05-06 | Kayaba Ind Co Ltd | Hydraulic control device |
| JPS62165003A (en) * | 1986-01-10 | 1987-07-21 | Tech Res Assoc Openair Coal Min Mach | Working oil distributing device in hydraulic circuit of hydraulic shovel or the like |
| JPS62225633A (en) * | 1986-03-26 | 1987-10-03 | Tech Res Assoc Openair Coal Min Mach | Distributor for working oil in oil-pressure circuit of oil-pressure shovel, and the like |
| US5067321A (en) * | 1989-02-23 | 1991-11-26 | Kabushiki Kaisha Kobe Seiko Sho | Hydraulic hoisting circuit with electrical control for relief valve adjustment pilot and pilot disable valve |
| JP2009156323A (en) * | 2007-12-26 | 2009-07-16 | Kubota Corp | Control valve device |
| JP2015206420A (en) * | 2014-04-21 | 2015-11-19 | 日立建機株式会社 | Hydraulic drive unit for construction machinery |
-
1981
- 1981-06-02 JP JP8510681A patent/JPS57201434A/en active Granted
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6188008A (en) * | 1984-10-08 | 1986-05-06 | Kayaba Ind Co Ltd | Hydraulic control device |
| JPS62165003A (en) * | 1986-01-10 | 1987-07-21 | Tech Res Assoc Openair Coal Min Mach | Working oil distributing device in hydraulic circuit of hydraulic shovel or the like |
| JPS62225633A (en) * | 1986-03-26 | 1987-10-03 | Tech Res Assoc Openair Coal Min Mach | Distributor for working oil in oil-pressure circuit of oil-pressure shovel, and the like |
| US5067321A (en) * | 1989-02-23 | 1991-11-26 | Kabushiki Kaisha Kobe Seiko Sho | Hydraulic hoisting circuit with electrical control for relief valve adjustment pilot and pilot disable valve |
| JP2009156323A (en) * | 2007-12-26 | 2009-07-16 | Kubota Corp | Control valve device |
| JP2015206420A (en) * | 2014-04-21 | 2015-11-19 | 日立建機株式会社 | Hydraulic drive unit for construction machinery |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6238497B2 (en) | 1987-08-18 |
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