CN104564919A - Hydraulic system of wheeled tractor - Google Patents
Hydraulic system of wheeled tractor Download PDFInfo
- Publication number
- CN104564919A CN104564919A CN201510040367.0A CN201510040367A CN104564919A CN 104564919 A CN104564919 A CN 104564919A CN 201510040367 A CN201510040367 A CN 201510040367A CN 104564919 A CN104564919 A CN 104564919A
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- CN
- China
- Prior art keywords
- pressure
- hydraulic
- distributor
- valve
- control 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.)
- Pending
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/024—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/615—Filtering means
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
A hydraulic system of a wheeled tractor comprises a double-tube oil filter, a gear pump, a priority valve, a distributor and a hydraulic output valve plate, wherein the double-tube oil filter is fixed on one side of a transmission case through a fixing support and a bolt, the gear pump is fixed on one side of an engine timing gear housing through a bolt, the priority valve is fixed on the fixing support through a bolt, the distributor is fixed on a lifter shell through a bolt, the hydraulic output valve plate is fixed on a multi-way valve support through a bolt, and the double-tube oil filter, the gear pump, the priority valve and the hydraulic output valve plate are connected through pipelines. The hydraulic system of the wheeled tractor has the advantages that operating states of operating devices for hydraulic lifting, hydraulic output and the like are achieved through functions of the priority valve; when the hydraulic lifting device is not in operation, a great quantity of lubricating oil directly flows into a pump inlet through the hydraulic output valve plate via an oil-return oil filter in the double-tube oil filter to enter small circulation; sensitivity of the hydraulic system on oil liquid cleanliness is weakened; valve jamming probability of the hydraulic system is decreased, and accordingly, the whole hydraulic system is precise and meticulous in structure.
Description
Technical field
The invention belongs to tractor field, relate to a kind of wheeled tractor hydraulic system.
Background technique
At present, on existing high and medium power wheeled tractor, its hydraulic system oil is many from power train, due to the restriction of existing technological level, power train inner fluid turbidity test often cannot meet the functional requirement of hydraulic system, so just easily cause the appearance of the faults such as hydraulic system card valve.Therefore, can by rearranging and the improvement of component hydraulic system hydraulic element, hydraulic pressure in existing hydraulic system is exported the in parallel oil circuit of series connection oil circuit instead by special pressure-gradient control valve of valve block and distributor, increase bitubular oil purifier, change oil circuit Placement, just can greatly reduce the susceptibility of hydraulic system to oil cleanliness, decrease the card valve probability of hydraulic system, improve the reliability of hydraulic system.
Summary of the invention
The object of the present invention is to provide a kind of compact structure, use wheeled tractor hydraulic system that is reliable, handling facility, by the reasonable combination to distributor, pressure-gradient control valve, hydraulic pressure delivery valve, oil purifier etc., conveniently can realize agricultural machinery and implement that tractor is joined and carry out functions such as promoting, decline and float, and meet the needs of hydraulic pressure output simultaneously.
The present invention can achieve the above object by the following technical programs: a kind of wheeled tractor hydraulic system, comprising: bitubular oil purifier, gear pump, pressure-gradient control valve, distributor, and hydraulic pressure exports valve block; Bitubular oil purifier is by fixed support and be bolted to transmission case side; Gear pump is bolted on motor wife gear chamber side; Pressure-gradient control valve is bolted on fixed support; Distributor is bolted on lifter housing; Hydraulic pressure exports valve block and is bolted on Multipath valve rack; Bitubular oil purifier, gear pump, pressure-gradient control valve, distributor, hydraulic pressure export between valve block by pipeline UNICOM.
The upper outlet of bitubular oil purifier is connected with the inlet port of gear pump by pipeline; The middle outlet of bitubular oil purifier is connected with bottom transmission case by pipeline; The lower outlet of bitubular oil purifier exports valve block return opening by pipeline and hydraulic pressure and is connected; The CF mouth of pressure-gradient control valve is connected with the filler opening of distributor by pipeline; The filler opening that the EF mouth of pressure-gradient control valve exports valve block by pipeline and hydraulic pressure is connected; The feedback hydraulic fluid port of pressure-gradient control valve is connected with the feedback hydraulic fluid port of distributor by pipeline; The safety valve return opening of pressure-gradient control valve is connected with the lower outlet of bitubular oil purifier by pipeline.
Following beneficial effect can be reached: the working state of the equipments such as hydraulic pressure lift, hydraulic pressure output realized by the function of pressure-gradient control valve after the present invention adopts technique scheme; When hydraulic lifting apparatus does not work, a large amount of lubricant oil directly exports valve block return oil filter inflow pump entrance in bitubular oil purifier by hydraulic pressure, enters short circle; Decrease the susceptibility of hydraulic system to oil cleanliness; Decrease hydraulic system card valve probability, whole system is of a tightly knit structure, careful.
Accompanying drawing explanation
Fig. 1 is the structural representation that a kind of wheeled tractor hydraulic system of the present invention is arranged on tractor;
Fig. 2 is a kind of wheeled tractor hydraulic system of the present invention distributor meta and hydraulic pressure schematic diagram when exporting valve block meta.
Fig. 3 is a kind of wheeled tractor hydraulic system of the present invention distributor working position and hydraulic pressure schematic diagram when exporting valve block meta.
Fig. 4 is a kind of wheeled tractor hydraulic system of the present invention distributor meta and hydraulic pressure schematic diagram when exporting valve block working position.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.As shown in figures 1-4, a kind of wheeled tractor hydraulic system, mainly comprises bitubular oil purifier 1, gear pump 2, pressure-gradient control valve 3, distributor 4, and hydraulic pressure exports composition such as valve block 5 grade; It is characterized in that: bitubular oil purifier 1 is by fixed support 6 and be bolted to transmission case 7 side; Gear pump 2 is bolted on motor wife gear chamber 8 side; Pressure-gradient control valve 3 is bolted on fixed support 6; Distributor 4 is bolted on lifter housing 9; Hydraulic pressure exports valve block 5 and is bolted on Multipath valve rack 10.Bitubular oil purifier 1, gear pump 2, pressure-gradient control valve 3, distributor 4, hydraulic pressure export between valve block 5 by pipeline UNICOM.
The upper outlet A of bitubular oil purifier 1 is connected with the inlet port B of gear pump 2 by pipeline; The middle outlet C of bitubular oil purifier 1 is connected with bottom transmission case 7 by pipeline; The lower outlet D of bitubular oil purifier 1 exports valve block 5 return opening E by pipeline and hydraulic pressure and is connected; The CF mouth of pressure-gradient control valve 3 is connected with the filler opening F of distributor 4 by pipeline; The filler opening G that the EF mouth of pressure-gradient control valve 3 exports valve block 5 by pipeline and hydraulic pressure is connected; The feedback hydraulic fluid port H of pressure-gradient control valve 3 is connected with the feedback hydraulic fluid port I of distributor 4 by pipeline; The safety valve return opening J of pressure-gradient control valve 3 is connected with the lower D that exports of bitubular oil purifier 1 by pipeline.
Under initial state, when namely distributor 4 and hydraulic pressure output valve block 5 all do not work, now gear pump 2 passes through the middle outlet C of bitubular oil purifier 1 from oil suction in transmission case, distributor 4 filler opening F is entered by the CF mouth of pressure-gradient control valve 3, now through distributor 4 fluid first in distributor 4 main valve overcome scavenger valve spring force in distributor 4, scavenger valve is opened, fluid restriction in distributor 4 like this through the CF mouth of pressure-gradient control valve 3 flows back to transmission case by scavenger valve in distributor 4, in distributor 4, the fluid of restriction produces pressure at restriction two ends, this pressure acts on the two ends of pressure-gradient control valve 3, after pressure difference exceedes pressure-gradient control valve 3 left end spring pressure, pressure-gradient control valve 3 is in left position, like this because pressure-gradient control valve 3 left springs are very weak, generally be designed to 1-2MPa, by the flow of restriction in distributor 4 for the pressure reduction produced during about 1.4L/min can promote the spring of pressure-gradient control valve 3, ensure that next oily only about the 1.4L/min of gear pump 2 flows back to transmission case by scavenger valve in distributor 4, all the other most of fluid are all exported valve block 5 through hydraulic pressure and are entered the entrance of gear pump 2 by the lower outlet D of bitubular oil purifier 1, whole system enters short circle, and the oil-suction oil filter of bitubular oil purifier 1 is the leakage of replenishment system and the fluid that flows back to from distributor 4 only, when the return oil filter pressure reduction of bitubular oil purifier 1 exceedes return oil filter bypass valve pressure, bypass valve is opened.
When distributor 4 is in working position, hydraulic pressure exports valve block 5 and is in meta, and namely distributor 4 works, and when hydraulic pressure output valve block 5 does not work, now by the hydraulic oil of gear pump 2, enters distributor 4 by the CF mouth of pressure-gradient control valve 3.Now distributor 4 main valve is in running order, logical fuel tank on the left of the scavenger valve in distributor 4, and the scavenger valve in distributor 4 is in closed condition under the spring action of right side; In distributor 4, the fluid of restriction cannot produce pressure at restriction two ends, and pressure-gradient control valve 3, under left end spring pressure, is in right position, and such oil pump is next oily all enters distributor 4, carries out work; When system pressure exceed pressure-gradient control valve 3 set safety valve pressure time, the safety valve of pressure-gradient control valve 3 is opened, and protects the safe and reliable of hydraulic system;
When distributor 4 is in meta, hydraulic pressure exports valve block 5 and is in working position, namely distributor 4 does not work, when hydraulic pressure output valve block 5 works, now by the hydraulic oil of gear pump 2, enter distributor 4 by the CF mouth of pressure-gradient control valve 3, through the fluid first main valve in distributor 4 of distributor 4, overcome scavenger valve spring force in distributor 4, scavenger valve is opened, fluid restriction in distributor 4 like this through the CF mouth of pressure-gradient control valve 3 flows back to transmission case by scavenger valve in distributor 4, in distributor 4, the fluid of restriction produces pressure at restriction two ends, this pressure acts on the two ends of pressure-gradient control valve 3, after pressure difference exceedes pressure-gradient control valve 3 left end spring pressure, pressure-gradient control valve 3 is in left position, because pressure-gradient control valve 3 left springs are very weak, generally be designed to 1-2MPa, by the flow of restriction in distributor 4 for the pressure reduction produced during about 1.4L/min can promote pressure-gradient control valve 3 spring, ensure that next oily only about the 1.4L/min of gear pump 2 flows back to transmission case by scavenger valve in distributor 4, all the other most of fluid all enter hydraulic pressure output valve block 5 through the EF mouth of pressure-gradient control valve 3 and carry out work, along with hydraulic pressure exports the increase of valve block 5 delivery outlet pressure, cause the increase of the inlet pressure entering pressure-gradient control valve 3, produce larger pressure reduction by the entrance of pressure-gradient control valve 3 and CF outlet port, but due to very little through fluid flow herein, be unlikely to the heating causing system, the leakage of the oil-suction oil filter of bitubular oil purifier 1 only replenishment system, the fluid exporting fluid and flow back to from distributor 4, when the return oil filter pressure reduction of bitubular oil purifier 1 exceedes return oil filter bypass valve pressure, bypass valve is opened.
Whole system ensure that hydraulic system enters short circle in the working time more than 80%; During hydraulic system enters short circle, the oil cleanliness of hydraulic system can be fully guaranteed; The oil-suction oil filter of bitubular oil purifier 1 is in the leakage of the only replenishment system working time more than 90%, and the fluid exporting fluid and flow back to from distributor 4, greatly strengthen the anti-soil time, decrease the maintenance of system.
Claims (2)
1. a wheeled tractor hydraulic system, comprising: bitubular oil purifier (1), gear pump (2), pressure-gradient control valve (3), distributor (4), hydraulic pressure export valve block (5); It is characterized in that: bitubular oil purifier (1) is by fixed support (6) and be bolted to transmission case (7) side; Gear pump (2) is bolted on motor wife gear chamber (8) side; Pressure-gradient control valve (3) is bolted on fixed support (6); Distributor (4) is bolted on lifter housing (9); Hydraulic pressure exports valve block (5) and is bolted on Multipath valve rack (10); Bitubular oil purifier (1), gear pump (2), pressure-gradient control valve (3), distributor (4), hydraulic pressure export between valve block (5) by pipeline UNICOM.
2. a kind of wheeled tractor hydraulic system according to claim 1, is characterized in that: the upper outlet (A) of bitubular oil purifier (1) is connected with the inlet port (B) of gear pump (2) by pipeline; The middle outlet (C) of bitubular oil purifier (1) is connected with transmission case (7) bottom by pipeline; The lower outlet (D) of bitubular oil purifier (1) exports valve block (5) return opening (E) by pipeline and hydraulic pressure and is connected; (CF) mouth of pressure-gradient control valve (3) is connected with the filler opening (F) of distributor (4) by pipeline; The filler opening (G) that (EF) mouth of pressure-gradient control valve (3) exports valve block (5) by pipeline and hydraulic pressure is connected; The feedback hydraulic fluid port (H) of pressure-gradient control valve (3) is connected with the feedback hydraulic fluid port (I) of distributor (4) by pipeline; The safety valve return opening (J) of pressure-gradient control valve (3) is connected with the lower outlet (D) of bitubular oil purifier (1) by pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510040367.0A CN104564919A (en) | 2015-01-27 | 2015-01-27 | Hydraulic system of wheeled tractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510040367.0A CN104564919A (en) | 2015-01-27 | 2015-01-27 | Hydraulic system of wheeled tractor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104564919A true CN104564919A (en) | 2015-04-29 |
Family
ID=53081759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510040367.0A Pending CN104564919A (en) | 2015-01-27 | 2015-01-27 | Hydraulic system of wheeled tractor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104564919A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108716487A (en) * | 2018-06-11 | 2018-10-30 | 雷沃重工股份有限公司 | Tractor shares oil hydraulic system and tractor |
| CN111120437A (en) * | 2020-02-05 | 2020-05-08 | 山东路得威工程机械制造有限公司 | Multi-mode steering and traveling system of engineering machinery |
| CN113446281A (en) * | 2021-07-22 | 2021-09-28 | 山东弘宇农机股份有限公司 | Lifter distributor for tractor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040060712A1 (en) * | 2001-03-29 | 2004-04-01 | Volvo Construction Equipment Holding Sweden Ab | Multipurpose heavy-construction machine of the loader shovel type |
| RU2233572C2 (en) * | 2002-10-31 | 2004-08-10 | Республиканское унитарное предприятие "Минский тракторный завод" | Hydraulic system for tractor hitch |
| CN200940613Y (en) * | 2006-03-31 | 2007-08-29 | 洛阳拖拉机研究所有限公司 | Tractor hydraulic distributor |
| CN202048037U (en) * | 2011-03-18 | 2011-11-23 | 常州联发凯迪机械有限公司 | Hydraulic distributor of wheeled tractor |
| CN204553420U (en) * | 2015-01-27 | 2015-08-12 | 第一拖拉机股份有限公司 | A kind of wheeled tractor hydraulic system |
-
2015
- 2015-01-27 CN CN201510040367.0A patent/CN104564919A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040060712A1 (en) * | 2001-03-29 | 2004-04-01 | Volvo Construction Equipment Holding Sweden Ab | Multipurpose heavy-construction machine of the loader shovel type |
| RU2233572C2 (en) * | 2002-10-31 | 2004-08-10 | Республиканское унитарное предприятие "Минский тракторный завод" | Hydraulic system for tractor hitch |
| CN200940613Y (en) * | 2006-03-31 | 2007-08-29 | 洛阳拖拉机研究所有限公司 | Tractor hydraulic distributor |
| CN202048037U (en) * | 2011-03-18 | 2011-11-23 | 常州联发凯迪机械有限公司 | Hydraulic distributor of wheeled tractor |
| CN204553420U (en) * | 2015-01-27 | 2015-08-12 | 第一拖拉机股份有限公司 | A kind of wheeled tractor hydraulic system |
Non-Patent Citations (1)
| Title |
|---|
| 雷蕾等: "一种拖拉机液压系统浅析", 《拖拉机与农用运输车》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108716487A (en) * | 2018-06-11 | 2018-10-30 | 雷沃重工股份有限公司 | Tractor shares oil hydraulic system and tractor |
| CN108716487B (en) * | 2018-06-11 | 2020-02-11 | 雷沃重工股份有限公司 | Tractor and common oil hydraulic system thereof |
| CN111120437A (en) * | 2020-02-05 | 2020-05-08 | 山东路得威工程机械制造有限公司 | Multi-mode steering and traveling system of engineering machinery |
| 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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| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150429 |
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| WD01 | Invention patent application deemed withdrawn after publication |