CN202007800U - Load sensing hydraulic system for tractor - Google Patents
Load sensing hydraulic system for tractor Download PDFInfo
- Publication number
- CN202007800U CN202007800U CN2011201081972U CN201120108197U CN202007800U CN 202007800 U CN202007800 U CN 202007800U CN 2011201081972 U CN2011201081972 U CN 2011201081972U CN 201120108197 U CN201120108197 U CN 201120108197U CN 202007800 U CN202007800 U CN 202007800U
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- oil
- load
- variable displacement
- valve
- displacement pump
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Abstract
The utility model relates to a load sensing hydraulic system for a tractor, which comprises a load sensing variable displacement pump, an oil filter, a dynamic signal priority valve, a variable displacement pump internal pressure comparison valve, a shuttle valve, an electric control lift valve plate, a load sensing reversing valve, a multiway valve assembly and the like. The load sensing variable displacement pump is arranged on an oil pump output shaft of a transmission case; the oil filter is arranged on a hydraulic oil tank; an outlet of the oil filter is connected with an inlet of the load sensing variable displacement pump through an oil pipe; an outlet of the load sensing variable displacement pump is connected with an inlet of the dynamic signal priority valve through an oil pipe; the dynamic signal priority valve is arranged on the lateral surface of the transmission case; one outlet of the dynamic signal priority valve is connected with an oil inlet of the multiway valve assembly through an oil pipe; the other outlet of the dynamic signal priority valve is connected with a steering system; one outlet of the electric control lift valve plate is connected with a lifting oil cylinder through a hose; the other outlet of the electric control lift valve plate is directly inducted into the hydraulic oil tank through an oil pipe; the shuttle valve is arranged on the lateral surface of the transmission case; and a feedback oil port of the multiway valve assembly, a feedback oil port of the load sensing variable displacement pump and a feedback oil port of the steering system are connected by oil pipes.
Description
Technical field
The utility model belongs to the tractor field, relates to a kind of used with tractor Load Sensing Hydraulic System.
Background technique
At present on the various model wheeled tractors of producing at home, adopt half separately placed type hydraulic system mostly, though prior art system has adopted servo distributor, lower-link sensing, the power, position, power position that can satisfy hydraulic lifting system comprehensively and float and basic agricultural operation such as regulate, but be difficult to overcome control accuracy low, handle defectives such as complicated, that the hydraulic power loss is big.Along with the raising of domestic agronomy and agricultural machinery development level and the application of compound farm implements, require to adopt big-powered tractor, the energy of consumes least, the maximum benefit of acquisition are the targets that people pursue always.Therefore, for improving the tractor hydraulic system utilization efficiency, reducing the system power loss, satisfy the requirement of multiple operation to multipath hydraulic output, developing a kind of Load Sensing Hydraulic System is a problem demanding prompt solution with the job requirements that satisfies wheeled tractor.
The model utility content
The purpose of this utility model is to provide a kind of rational in infrastructure, service-strong wheeled tractor Load Sensing Hydraulic System, to satisfy the usage requirement of large power wheel tractor.
The technical solution of the utility model is: the used with tractor Load Sensing Hydraulic System comprises load-transducing variable displacement pump, oil purifier, Dynamic Signal pressure-gradient control valve, variable displacement pump internal pressure relatively valve, shuttle valve, oil return oil purifier, automatically controlled lifting valve block, four groups of load-transducing selector valves, multi-way valve assembly; The load-transducing variable displacement pump is installed on the oil pump output shaft of tractor transmission case; Oil purifier is installed on the hydraulic oil container of tractor; The outlet of oil purifier is connected by the inlet of oil pipe with the load-transducing variable displacement pump; Load-transducing variable delivery side of pump is connected by the inlet of hydraulic pipe line with the Dynamic Signal pressure-gradient control valve, and the Dynamic Signal pressure-gradient control valve is installed in the tractor transmission case side; An outlet of Dynamic Signal pressure-gradient control valve is connected by oil pipe with the filler opening of multi-way valve assembly; Another outlet connects steering system; An outlet of automatically controlled lifting valve block is connected by flexible pipe with lift cylinder; The hydraulic oil container of tractor is directly flowed back in another outlet by oil pipe; Shuttle valve is installed in the side of tractor transmission case, is connected by feedback hydraulic fluid port and the feedback hydraulic fluid port of load-transducing variable displacement pump and the feedback hydraulic fluid port of steering system of oil pipe with the multi-way valve assembly.
The multi-way valve assembly comprises automatically controlled lifting valve block and four groups of load-transducing selector valves, and automatically controlled lifting valve block is connected by bolt with four groups of load-transducing selector valves; Being installed in tractor transmission case promotes on the support; The oil return of multi-way valve assembly is flowed back in the hydraulic oil container of tractor by oil pipe and the oil return oil purifier that is installed in the hydraulic oil container of tractor.
The utility model can reach following beneficial effect after adopting technique scheme: adopt unitized hydraulic pressure components and parts, reduced the specialized manufacturing expense of designing and developing, reduced artificial and manufacture cost; Adopt the load-transducing technology, reduced the loss of system power.The utilization electronic control technology carries out multi-parameter integrated control to the tractor operation process, thereby has improved the usability of tractor, can carry out fault diagnosis simultaneously and monitor, makes system works more reliable.
Description of drawings
Fig. 1 is the utility model used with tractor Load Sensing Hydraulic System structure principle chart.
Embodiment
As shown in drawings, the used with tractor Load Sensing Hydraulic System is by load-transducing variable displacement pump 1, oil purifier 2, Dynamic Signal pressure-gradient control valve 3, variable displacement pump internal pressure relatively valve 4, shuttle valve 5, oil return oil purifier 6, automatically controlled lifting valve block 7, four groups of load-transducing selector valves 8, multi-way valve assembly 9 etc.Load-transducing variable displacement pump 1 is installed on the oil pump output shaft of tractor transmission case; Oil purifier 2 is installed on the hydraulic oil container of tractor; The outlet of oil purifier 2 is connected by the inlet of oil pipe with load-transducing variable displacement pump 1; The outlet of load-transducing variable displacement pump 1 is connected by the inlet of hydraulic pipe line with Dynamic Signal pressure-gradient control valve 3, and Dynamic Signal pressure-gradient control valve 3 is installed in the tractor transmission case side; Its outlet is connected by oil pipe with the filler opening of multi-way valve assembly; The other end connects steering system; An outlet of automatically controlled lifting valve block 7 is connected by flexible pipe with lift cylinder; The hydraulic oil container of tractor is directly flowed back in another outlet by oil pipe; Shuttle valve 5 is installed in the side of tractor transmission case, by oil pipe the feedback hydraulic fluid port of multi-way valve assembly 9 and the feedback hydraulic fluid port of load-transducing variable displacement pump 1 and the feedback hydraulic fluid port of steering system is coupled together.Multi-way valve assembly 9 is made up of automatically controlled lifting valve block 7 and four groups of load-transducing selector valves 8, and automatically controlled lifting valve block 7 and four groups of load-transducing selector valves 8 are connected by bolt; Being installed in tractor transmission case promotes on the support; The oil return of multi-way valve assembly 9 is flowed back in the hydraulic oil container of tractor by oil pipe and the oil return oil purifier 6 that is installed in the hydraulic oil container of tractor.
Used with tractor Load Sensing Hydraulic System working principle: after tractor starts, fluid in the hydraulic oil container of tractor arrives load-transducing variable displacement pump 1 through oil suction oil purifier 2 under suction function, when steering system is not worked, when being in the neutral position, the hydraulic oil that load-transducing variable displacement pump 1 pumps into Dynamic Signal pressure-gradient control valve 3 wherein sub-fraction imports the load-transducing commutator of steering system through the LS loop, preheating is also kept the neutral condition of steering system, the working oil path of all the other most of flux and flow direction multi-way valve assemblies 9.The working oil path of multi-way valve assembly 9 comprises hydraulic lifting system and hydraulic pressure output system.With the elevator system is example, when automatically controlled lifting valve block 7 is in the neutral position is that system is when unloaded, the pressure that feeds back to load-transducing variable displacement pump 1 by shuttle valve 5 is zero, 1 of load-transducing variable displacement pump provides a small flow, satisfies load-transducing variable displacement pump 1 lubricating with the lubricated of other each lubricating points own by bypass valve and gets final product; The outlet pressure of load-transducing variable displacement pump 1 is very low at this moment, and it is lubricated only to keep system; Power consumpiton is very little; When action takes place automatically controlled lifting valve block 7 is that elevator system is when having load, induced pressure is passed to a relatively end of valve 4 of load-transducing variable displacement pump 1 internal pressure by shuttle valve 5, load-transducing variable displacement pump 1 changes the angle of pump swash plate than valve 4 front and back pressure difference signals according to pressure ratio, thereby provide the delivery pressure that adapts with load all the time, and the output flow of load-transducing variable displacement pump 1 is relevant with the aperture of automatically controlled lifting valve block 7 all the time, and is irrelevant with the load size.After arriving working stroke, automatically controlled lifting valve block 7 is back to meta, and shuttle valve 5 feedback pressures are zero; The swash plate angle makes zero in the load-transducing variable displacement pump 1, and load-transducing variable displacement pump 1 only provides in order to the oil mass of keeping system's leakage loss and very little pressure.
The hydraulic pressure output system with it in like manner, action takes place for load-transducing selector valve 8 is that the hydraulic pressure output system is when having load, induced pressure is passed to a relatively end of valve 4 of load-transducing variable displacement pump 1 internal pressure by shuttle valve 5, load-transducing variable displacement pump 1 changes the angle of pump swash plate than valve 4 front and back pressure difference signals according to pressure ratio, thereby provide the delivery pressure that adapts with load all the time, and the output flow of load-transducing variable displacement pump 1 is relevant with the aperture of load-transducing selector valve 8 all the time, and is irrelevant with the load size.After arriving working stroke, load-transducing selector valve 8 is back to meta, and shuttle valve 5 feedback pressures are zero; The swash plate angle makes zero in the load-transducing variable displacement pump 1, and load-transducing variable displacement pump 1 only provides in order to the oil mass of keeping system's leakage loss and very little pressure.
When having two or more actions to work simultaneously in the system, induced pressure by shuttle valve in the multi-way valve assembly 9 relatively, wherein Zui Da pressure is delivered to a relatively end of valve 4 of load-transducing variable displacement pump 1 internal pressure by shuttle valve 5, load-transducing variable displacement pump 1 changes the angle of pump swash plates according to pressure ratio than valve 4 front and back pressure difference signals, thereby the delivery pressure that adapts with high capacity is provided all the time; Under the situation that total discharge can satisfy, the output flow of each road valve is then only relevant with the aperture of the valve on each road, and is irrelevant with load.After arriving working stroke, shuttle valve 5 feedback pressures are zero; The swash plate angle makes zero in the load-transducing variable displacement pump 1, and load-transducing variable displacement pump 1 only provides in order to the oil mass of keeping system's leakage loss and very little pressure.
Claims (2)
1. a used with tractor Load Sensing Hydraulic System comprises: load-transducing variable displacement pump (1), oil purifier (2), Dynamic Signal pressure-gradient control valve (3), variable displacement pump internal pressure comparison valve (4), shuttle valve (5), oil return oil purifier (6), automatically controlled lifting valve block (7), four groups of load-transducing selector valves (8), multi-way valve assembly (9); It is characterized in that: load-transducing variable displacement pump (1) is installed on the oil pump output shaft of tractor transmission case; Oil purifier (2) is installed on the hydraulic oil container of tractor; The outlet of oil purifier (2) is connected by the inlet of oil pipe with load-transducing variable displacement pump (1); The outlet of load-transducing variable displacement pump (1) is connected by the inlet of hydraulic pipe line with Dynamic Signal pressure-gradient control valve (3), and Dynamic Signal pressure-gradient control valve (3) is installed in the tractor transmission case side; An outlet of Dynamic Signal pressure-gradient control valve (3) is connected by oil pipe with the filler opening of multi-way valve assembly; Another outlet connects steering system; An outlet of automatically controlled lifting valve block (7) is connected by flexible pipe with lift cylinder; The hydraulic oil container of tractor is directly flowed back in another outlet by oil pipe; Shuttle valve (5) is installed in the side of tractor transmission case, is connected by feedback hydraulic fluid port and the feedback hydraulic fluid port of load-transducing variable displacement pump (1) and the feedback hydraulic fluid port of steering system of oil pipe with multi-way valve assembly (9).
2. used with tractor Load Sensing Hydraulic System according to claim 1, it is characterized in that: multi-way valve assembly (9) comprises automatically controlled lifting valve block (7) and four groups of load-transducing selector valves (8), and automatically controlled lifting valve block (7) is connected by bolt with four groups of load-transducing selector valves (8); Being installed in tractor transmission case promotes on the support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201081972U CN202007800U (en) | 2011-04-14 | 2011-04-14 | Load sensing hydraulic system for tractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201081972U CN202007800U (en) | 2011-04-14 | 2011-04-14 | Load sensing hydraulic system for tractor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202007800U true CN202007800U (en) | 2011-10-12 |
Family
ID=44749457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201081972U Expired - Fee Related CN202007800U (en) | 2011-04-14 | 2011-04-14 | Load sensing hydraulic system for tractor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202007800U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109882468A (en) * | 2019-04-12 | 2019-06-14 | 第一拖拉机股份有限公司 | A kind of used with tractor is automatically controlled to promote preferential pile-up valve |
| CN113446281A (en) * | 2021-07-22 | 2021-09-28 | 山东弘宇农机股份有限公司 | Lifter distributor for tractor |
-
2011
- 2011-04-14 CN CN2011201081972U patent/CN202007800U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109882468A (en) * | 2019-04-12 | 2019-06-14 | 第一拖拉机股份有限公司 | A kind of used with tractor is automatically controlled to promote preferential pile-up valve |
| CN113446281A (en) * | 2021-07-22 | 2021-09-28 | 山东弘宇农机股份有限公司 | Lifter distributor for tractor |
| CN113446281B (en) * | 2021-07-22 | 2022-07-15 | 山东弘宇农机股份有限公司 | Lifter distributor for tractor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: FIRST TRACTOR CO., LTD. Free format text: FORMER OWNER: CHINA YITUO GROUP CO., LTD. Effective date: 20120208 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 471039 LUOYANG, HENAN PROVINCE TO: 471000 LUOYANG, HENAN PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20120208 Address after: 471000 No. 154, Jianxi, Luoyang District, Henan, Jianshe Road Patentee after: First Tractor Co., Ltd. Address before: 471039 No. 39, Xiyuan Road, Jianxi District, Henan, Luoyang Patentee before: China Yituo Group Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111012 Termination date: 20200414 |