JPS57190845A - Hydraulic circuit for hydraulic shovel - Google Patents
Hydraulic circuit for hydraulic shovelInfo
- Publication number
- JPS57190845A JPS57190845A JP7556981A JP7556981A JPS57190845A JP S57190845 A JPS57190845 A JP S57190845A JP 7556981 A JP7556981 A JP 7556981A JP 7556981 A JP7556981 A JP 7556981A JP S57190845 A JPS57190845 A JP S57190845A
- Authority
- JP
- Japan
- Prior art keywords
- revolving
- valve
- circuit
- revolution
- led
- 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
Abstract
PURPOSE:To enable to always perform an appropriate revolution, by a method wherein a hydraulic circuit of a hydraulic shovel is caused to receive a reduced shock produced at a revolution accelerating time and a decelerating time, a revolution circuit takes a precedence of other circuits at a time when a revolving operation and an arm and boom operation take place simultaneously. CONSTITUTION:In the case of revolution, a lever 51 falls in an A-direction, and a pressure PiA, produced at a secondary side of a varibale pressure reducing valve 53a of a remote control valve 50, is led to an A1-direction. With a revolving switching valve 22 changed over, a discharge oil of a hydraulic pump P2 is led in an A2-direction, and is led to a revolving motor M3 through a counter balance valve 63 to perform a revolving acceleration. Then, if a switching valve 23 for arm is changed over, extra oil, bled off by a valve 40, is led in an A5-direction to flow to an arm cylinder. A discharge pressure of a hydraulic pump P2 flows, in priority, to a revolving circuit without being affected by a pressure of an arm circuit. At a time when a revolving acceleration and a boom lifting operation are simultaneously performed, a discharge oil of the hydraulic pump P2 is flowed to the revolving circuit, taking a precedence of others, by means of a variable sequence valve 40, and besides, extra oil flows from the valve to accelerate revolution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7556981A JPS57190845A (en) | 1981-05-18 | 1981-05-18 | Hydraulic circuit for hydraulic shovel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7556981A JPS57190845A (en) | 1981-05-18 | 1981-05-18 | Hydraulic circuit for hydraulic shovel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57190845A true JPS57190845A (en) | 1982-11-24 |
| JPS6238496B2 JPS6238496B2 (en) | 1987-08-18 |
Family
ID=13579937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7556981A Granted JPS57190845A (en) | 1981-05-18 | 1981-05-18 | Hydraulic circuit for hydraulic shovel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57190845A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6188008A (en) * | 1984-10-08 | 1986-05-06 | Kayaba Ind Co Ltd | Hydraulic control device |
| JPS6427504U (en) * | 1987-08-09 | 1989-02-16 | ||
| EP0887476A1 (en) * | 1997-06-23 | 1998-12-30 | Hitachi Construction Machinery Co., Ltd. | Hydraulic drive system for construction machine |
| EP1672128A2 (en) | 2004-12-16 | 2006-06-21 | Doosan Infracore Co., Ltd. | Hydraulic control device of an excavator with improved loading performance on a slope |
| CN108916141A (en) * | 2018-05-29 | 2018-11-30 | 武汉船用机械有限责任公司 | A kind of high pressure towing winch hydraulic control system with multi gear load and speed |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0620370B2 (en) * | 1992-10-29 | 2000-12-06 | Hitachi Construction Machinery Co., Ltd. | Hydraulic control valve apparatus and hydraulic drive system |
-
1981
- 1981-05-18 JP JP7556981A patent/JPS57190845A/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 |
| JPS6427504U (en) * | 1987-08-09 | 1989-02-16 | ||
| EP0887476A1 (en) * | 1997-06-23 | 1998-12-30 | Hitachi Construction Machinery Co., Ltd. | Hydraulic drive system for construction machine |
| EP1672128A2 (en) | 2004-12-16 | 2006-06-21 | Doosan Infracore Co., Ltd. | Hydraulic control device of an excavator with improved loading performance on a slope |
| EP1672128A3 (en) * | 2004-12-16 | 2013-04-24 | Doosan Infracore Co., Ltd. | Hydraulic control device of an excavator with improved loading performance on a slope |
| CN108916141A (en) * | 2018-05-29 | 2018-11-30 | 武汉船用机械有限责任公司 | A kind of high pressure towing winch hydraulic control system with multi gear load and speed |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6238496B2 (en) | 1987-08-18 |
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