CN102555793B - Driving system of engineering machinery and closed hydraulic circuit thereof - Google Patents
Driving system of engineering machinery and closed hydraulic circuit thereof Download PDFInfo
- Publication number
- CN102555793B CN102555793B CN201110423049.4A CN201110423049A CN102555793B CN 102555793 B CN102555793 B CN 102555793B CN 201110423049 A CN201110423049 A CN 201110423049A CN 102555793 B CN102555793 B CN 102555793B
- Authority
- CN
- China
- Prior art keywords
- valve
- interface
- pipeline
- motor
- oil 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.)
- Active
Links
- 238000004146 energy storage Methods 0.000 claims abstract description 4
- 238000009825 accumulation Methods 0.000 claims description 20
- 239000012530 fluid Substances 0.000 claims description 17
- 239000002828 fuel tank Substances 0.000 claims description 12
- 238000010276 construction Methods 0.000 claims description 11
- 230000001502 supplementing effect Effects 0.000 abstract 3
- 239000003921 oil Substances 0.000 description 47
- 230000003068 static effect Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
- B60K17/10—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of fluid gearing
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Forklifts And Lifting Vehicles (AREA)
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
A first switching valve is connected between a first interface of a closed oil pump and a first interface of a motor through a pipeline, and a second switching valve is connected between a second interface of the closed oil pump and a second interface of the motor through a pipeline; the oil output of the oil supplementing pump is divided into a first branch, a second branch and a third branch, wherein the first branch is connected to a pipeline between a first switching valve and a first interface of the closed oil pump through a first oil supplementing valve, the second branch is connected to a pipeline between a second switching valve and a second interface of the closed oil pump through a second oil supplementing valve, the third branch is connected with a one-way locking valve and then divided into two branches, one branch is connected to a pipeline between the first switching valve and the first interface of the motor through a first safety valve, the other branch is connected to a pipeline between the second switching valve and the second interface of the motor through a second safety valve, and an energy storage component is connected to a pipeline between the one-way locking valve and each safety valve.
Description
Technical field
The present invention is about a kind of drive system, and particularly about a kind of drive system and closed hydraulic loop thereof that is applied to construction machinery and equipment.
Background technology
Hydrostatic drive is take liquid as working medium, realizes the technology of transformation of energy, transmission and control by various Hydraulic Elements, and it,, as one of Key technology of modern transmission and control, has been widely used in various mechanical equipments.In numerous construction machinery and equipments, as excavating machine, hoisting crane, bulldozer, generally adopt hydrostatic drive and full hydraulic drive.
Hydraulicdriven hydraulic circuit, according to the cycle mode of working medium, can be divided into open circuit and closed hydraulic loop.Closed hydraulic loop energy consumption is low, compact conformation is also easily realized stepless change, in engineering machinery running system, is widely used.
Please refer to Fig. 1, a kind of closed hydraulic loop of existing application project machinery, comprises enclosed oil pump 11, slippage pump 12, Fill valve 13, repairing by pass valve 14, motor 15 and fuel tank 16.Enclosed oil pump 11 is directly connected by pipeline with motor 15, by changing the variable of enclosed oil pump 11 with flow and the direction of hydraulic oil in change working connection, thereby realizes speed change and the commutation of motor 15.Slippage pump 12 is connected by Fill valve 13 with motor 15 2 side pipe roads respectively, the flow of revealing with charging system.Slippage pump 12 forms a loop with repairing by pass valve 14, fuel tank 16, and slippage pump 12 is from fuel tank 16 inspiration oil, and outside the flow that part oil is revealed for charging system, most of oil is back to fuel tank 16 through repairing by pass valve 14.
When construction machinery and equipment is during at state in slope, thereby vehicle bridge provides reactive torque and rotation trend can drive motor to cause motor to get rid of pressure by static to the action of rotation trend.But existing closed hydraulic loop can not be born motor and be got rid of pressure, motor easily rotates, thereby drives vehicle bridge to rotate, and occurs slipping car phenomenon, is not therefore suitable in the drive system of construction machinery and equipment.
Summary of the invention
The invention provides a kind of closed hydraulic loop, it is applicable to being applied to the drive system of construction machinery and equipment.
In addition, the invention provides a kind of drive system of the construction machinery and equipment with above-mentioned closed hydraulic loop.
For reaching above-mentioned advantage, the invention provides a kind of closed hydraulic loop, comprise enclosed oil pump, motor, slippage pump, the first Fill valve and the second Fill valve, described enclosed oil pump comprises first interface and the second interface, described motor comprises first interface and the second interface, described closed hydraulic loop also comprises the first transfer valve, the second transfer valve, unidirectional locking valve, accumulation of energy parts, the first safety valve and the second safety valve, described the first transfer valve is connected between the first interface of enclosed oil pump and the first interface of motor by pipeline, described the second transfer valve is connected between the second interface of enclosed oil pump and the second interface of motor by pipeline, the fluid output of described slippage pump is divided into first along separate routes, the second shunt and the 3rd along separate routes, wherein first be connected on the pipeline between the first transfer valve and the first interface of enclosed oil pump by the first Fill valve along separate routes, second is connected on the pipeline between the second transfer valve and the second interface of enclosed oil pump by the second Fill valve along separate routes, after connecting unidirectional locking valve, the 3rd shunt is divided into two branch roads, one of them branch road is connected on the pipeline between the first transfer valve and the first interface of motor by the first safety valve, another branch road is connected to by the second safety valve on the pipeline between the second interface of the second transfer valve and motor, described accumulation of energy parts are connected on the pipeline between unidirectional locking valve and each safety valve.
In one embodiment of this invention, between the first interface of described enclosed oil pump and the first transfer valve, be connected by the first pipeline, between described the first transfer valve and the first interface of motor, be connected by second pipe, between the second interface of described enclosed oil pump and the second transfer valve, be connected by the 3rd pipeline, between described the second transfer valve and the second interface of motor, be connected by the 4th pipeline.
In one embodiment of this invention, described enclosed oil pump and described slippage pump are twin working barrel.
In one embodiment of this invention, described enclosed oil pump is connected with different actuating devices from described slippage pump.
In one embodiment of this invention, described closed hydraulic loop also comprises fuel tank and repairing by pass valve, and described repairing by pass valve is connected between described slippage pump and described fuel tank.
In one embodiment of this invention, described accumulation of energy parts are energy storage or accumulation of energy oil cylinder.
The present invention also provides a kind of drive system of construction machinery and equipment, comprise driving engine, vehicle bridge reductor and vehicle bridge, described drive system also comprises above-mentioned closed hydraulic loop, described driving engine drives and is connected with described enclosed oil pump and described slippage pump, described motor drives and is connected with described vehicle bridge reductor, and described vehicle bridge reductor drives and is connected with described vehicle bridge.
Compare prior art, closed hydraulic loop of the present invention is in the time that vehicle stop turns round, the first transfer valve and the second transfer valve are closed, motor two ends oil sources cuts off completely, therefore can bearing, oil sources relative closure under the pressure of first, second safety valve setting in motor two ends gets rid of pressure, even in the time that motor is revealed because of Volumetric efficiency problem, the fluid of accumulation of energy parts can compensate low pressure chamber in time, thereby avoid vehicle to glide and cause safety misadventure in the time staying slope, engine off and do not brake.
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and coordinate appended graphicly, be described in detail below.
Accompanying drawing explanation
Fig. 1 is a kind of closed hydraulic loop schematic diagram of prior art.
Fig. 2 is the scheme of installation of the closed hydraulic loop of preferred embodiment of the present invention.
Fig. 3 is the structural representation of the closed hydraulic loop of preferred embodiment of the present invention.
The specific embodiment
Please refer to Fig. 2 and Fig. 3, the drive system 1000 of construction machinery and equipment of the present invention comprises closed hydraulic loop 200, driving engine 300, vehicle bridge reductor 400, vehicle bridge 500 and is arranged on the tire 600 in vehicle bridge 500.
Closed hydraulic loop 200 comprises major loop 70 and recharging oil device 30.Major loop 70 comprises enclosed oil pump 20, the first transfer valve 75, motor 40, the second transfer valve 76.Enclosed oil pump 20 comprises first interface 22 and the second interface 24.Motor 40 comprises first interface 42 and the second interface 44.Between the first interface 22 of enclosed oil pump 20 and the first transfer valve 75, be connected by the first pipeline 71, between the first transfer valve 75 and the first interface 42 of motor 40, be connected by second pipe 72.Between the second interface 24 of the second transfer valve 76 and enclosed oil pump 20, be connected by the 3rd pipeline 73, between the second interface 44 of motor 40 and the second transfer valve 76, be connected by the 4th pipeline 74.In the time closing described the first transfer valve 75 and described the second transfer valve 76, the fluid of pipeline 71 and pipeline 72 is intercepted completely by the first transfer valve 75 simultaneously, and the fluid of pipeline 73 and pipeline 74 is intercepted completely by the second transfer valve 76.
Recharging oil device 30 comprises fuel tank 60, slippage pump 31, the first Fill valve 32a, the second Fill valve 32b, repairing by pass valve 33, unidirectional locking valve 35, accumulation of energy parts 36, the first safety valve 37 and the second safety valve 38.In the present embodiment, accumulation of energy parts are energy storage or accumulation of energy oil cylinder.Slippage pump 31 is drawn fluid from fuel tank 60, and the fluid of slippage pump 31 is divided into three outputs along separate routes, and first is connected on the pipeline 71 between the first transfer valve 75 and the first interface 22 of enclosed oil pump 20 by the first Fill valve 32a along separate routes.Second is connected on the pipeline 73 between the second interface 24 of the second transfer valve 76 and enclosed oil pump 20 by the second Fill valve 32b along separate routes.After connecting unidirectional locking valve 35, the 3rd shunt is divided into two branch roads, one of them branch road is connected on the pipeline 72 between the first transfer valve 75 and the first interface 42 of motor 40 by the first safety valve 37, and another branch road is connected to by the second safety valve 38 on the pipeline 74 between the second interface 44 of the second transfer valve 76 and motor 40; Repairing by pass valve 33 is connected between slippage pump 31 and fuel tank 60, and unnecessary fluid is back to fuel tank 60 to make slippage pump 31.Accumulation of energy parts 36 are connected on the pipeline between unidirectional locking valve 35 and each safety valve 37/38, and the setting of unidirectional locking valve 35 makes fluid flow to accumulation of energy parts 36 from slippage pump 31, and can not flow into slippage pump 31 from accumulation of energy parts 36.
The first transfer valve 75 and the second transfer valve 76 are for opening or cut off the oil sources at motor 40 two ends.System pressure when the first Fill valve 32a, the second Fill valve 32b normally work for the repairing of enclosed oil pump 20 and drive system is set; System pressure when repairing when the first safety valve 37 and the second safety valve 38 are static for motor 40 and drive system are static is set; When repairing by pass valve 33 is mainly used in hydraulic work system, the oil compensation pressure of low pressure chamber is set.When vehicle is in the time that driven is travelled, the 3rd shunt that slippage pump 31 is exported is not only carried out repairing work to system to accumulation of energy parts 36 are oil-filled, and system repairing is carried out along separate routes by first, second.
Fluid can flow out from the first interface of enclosed oil pump 20 22, and first transfer valve 75 of flowing through successively, motor 40 and the second transfer valve 76, get back to enclosed oil pump 20.Now, the first interface 42 of pipeline 71,72 and motor 40 is high pressure side, and the second interface 44 of pipeline 73,74 and motor 40 is low pressure side.When drive system work, the fluid of slippage pump 31 compensates pipeline 73 by the second Fill valve 32b.When drive system is static, the fluid of accumulation of energy parts 36 compensates pipeline 74 by the second safety valve 38.
Fluid also can flow out from the second interface 24 of enclosed oil pump 20, and second transfer valve 76 of flowing through successively, motor 40 and the first transfer valve 75, get back to enclosed oil pump 20.Now, the second interface 44 of pipeline 73,74 and motor 40 is high pressure side, and the first interface 42 of pipeline 71,72 and motor 40 is low pressure side.When drive system work, the fluid of slippage pump 31 compensates pipeline 71 by the first Fill valve 32a.When drive system is static, the fluid of accumulation of energy parts 36 compensates pipeline 72 by the first safety valve 37.
In present embodiment, slippage pump 31 is twin working barrel with enclosed oil pump 20, is all connected with driving engine 300.But, it may occur to persons skilled in the art that, slippage pump 31 also can drive by actuating device separately with enclosed oil pump 20, and not necessarily adopts the duplex pattern of same actuating device.
In the time that whole vehicle driving is travelled, power oil sources is exported from enclosed oil pump 20, slippage pump 31 is realized low pressure chamber repairing and 36 punching presses of accumulation of energy parts, now the first transfer valve 75 and the second transfer valve 76 are opened, oil sources directly drives motor 40 to rotate, and the bidirectional rotation that can realize motor 40 is advancing of vehicle and rewind function.When vehicle is in the time staying slope, engine off and do not brake, thereby vehicle bridge 500 provides reactive torque and rotation trend can drive motor 40 to cause motor 40 to get rid of pressure by static to the action of rotation trend; But while shutting down due to driving engine 300, the first transfer valve 75 and the second transfer valve 76 are closed, motor 40 two ends oil sources cut off completely, therefore relative closure can bear and get rid of pressure under the pressure that motor 40 two ends oil sources are set at first, second safety valve 37,38, even in the time that motor 40 is revealed because of Volumetric efficiency problem, the fluid of accumulation of energy parts 36 can compensate low pressure chamber in time, thereby avoids vehicle to glide and cause safety misadventure in the time staying slope, engine off and do not brake.
The above, only embodiments of the invention, not the present invention is done to any pro forma restriction, although the present invention discloses as above with embodiment, but not in order to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, when can utilizing the technology contents of above-mentioned announcement to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be not depart from technical solution of the present invention content, any simple modification of above embodiment being done according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (6)
1. a closed hydraulic loop, comprise enclosed oil pump, motor, slippage pump, the first Fill valve and the second Fill valve, described enclosed oil pump comprises first interface and the second interface, described motor comprises first interface and the second interface, it is characterized in that: described closed hydraulic loop also comprises the first transfer valve, the second transfer valve, unidirectional locking valve, accumulation of energy parts, the first safety valve and the second safety valve, described the first transfer valve is connected between the first interface of enclosed oil pump and the first interface of motor by pipeline, described the second transfer valve is connected between the second interface of enclosed oil pump and the second interface of motor by pipeline, the fluid output of described slippage pump is divided into first along separate routes, the second shunt and the 3rd along separate routes, wherein first be connected on the pipeline between the first transfer valve and the first interface of enclosed oil pump by the first Fill valve along separate routes, second is connected on the pipeline between the second transfer valve and the second interface of enclosed oil pump by the second Fill valve along separate routes, after connecting unidirectional locking valve, the 3rd shunt is divided into two branch roads, one of them branch road is connected on the pipeline between the first transfer valve and the first interface of motor by the first safety valve, another branch road is connected to by the second safety valve on the pipeline between the second interface of the second transfer valve and motor, described accumulation of energy parts are connected on the pipeline between unidirectional locking valve and each safety valve.
2. closed hydraulic loop as claimed in claim 1, is characterized in that: described enclosed oil pump and described slippage pump are twin working barrel.
3. closed hydraulic loop as claimed in claim 1, is characterized in that: described enclosed oil pump is connected with different actuating devices from described slippage pump.
4. closed hydraulic loop as claimed in claim 1, is characterized in that: described closed hydraulic loop also comprises fuel tank and repairing by pass valve, and described repairing by pass valve is connected between described slippage pump and described fuel tank.
5. closed hydraulic loop as claimed in claim 1, is characterized in that: described accumulation of energy parts are energy storage or accumulation of energy oil cylinder.
6. the drive system of a construction machinery and equipment, comprise driving engine, vehicle bridge reductor and vehicle bridge, it is characterized in that: described drive system also comprises the closed hydraulic loop as described in claim 1 to 5 any one, described driving engine drives and is connected with described enclosed oil pump and described slippage pump, described motor drives and is connected with described vehicle bridge reductor, and described vehicle bridge reductor drives and is connected with described vehicle bridge.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110423049.4A CN102555793B (en) | 2011-12-15 | 2011-12-15 | Driving system of engineering machinery and closed hydraulic circuit thereof |
| PCT/CN2012/082182 WO2013086885A1 (en) | 2011-12-15 | 2012-09-27 | Driving system of engineering machinery and closed hydraulic circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110423049.4A CN102555793B (en) | 2011-12-15 | 2011-12-15 | Driving system of engineering machinery and closed hydraulic circuit thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102555793A CN102555793A (en) | 2012-07-11 |
| CN102555793B true CN102555793B (en) | 2014-05-14 |
Family
ID=46402875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110423049.4A Active CN102555793B (en) | 2011-12-15 | 2011-12-15 | Driving system of engineering machinery and closed hydraulic circuit thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102555793B (en) |
| WO (1) | WO2013086885A1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102555793B (en) * | 2011-12-15 | 2014-05-14 | 中联重科股份有限公司 | Driving system of engineering machinery and closed hydraulic circuit thereof |
| CN102996539B (en) * | 2012-12-26 | 2015-07-15 | 中联重科股份有限公司 | Single-pump multi-motor unidirectional rotation closed hydraulic system and engineering machinery comprising same |
| CN103032395B (en) * | 2012-12-26 | 2015-10-28 | 中联重科股份有限公司 | Single-pump multi-motor closed hydraulic system and engineering machinery comprising same |
| CN103042915B (en) * | 2012-12-27 | 2016-04-06 | 三一重型装备有限公司 | Hydraulic differential mechanism and vehicle |
| CN103303138A (en) * | 2013-05-21 | 2013-09-18 | 哈尔滨工程大学 | Universal hydraulic walking power-driven device for construction machinery |
| CN103470567A (en) * | 2013-09-26 | 2013-12-25 | 镇江金天辰新材料有限公司 | Trailer system of skid loader |
| CN103790876B (en) * | 2014-02-28 | 2015-09-30 | 吉林大学 | A kind of Closed circuit hydraulic transmission system |
| CN103790875B (en) * | 2014-02-28 | 2015-09-30 | 吉林大学 | A kind of Hydraulic Power Transmission System allowing energy regenerating |
| DE102014214441B4 (en) | 2014-07-23 | 2016-02-18 | Danfoss Power Solutions Gmbh & Co. Ohg | Method and arrangement for decelerating a hydrostatic drive |
| CN107776401B (en) * | 2017-11-20 | 2024-05-17 | 力源液压（苏州）有限公司 | Double-speed hydraulic traveling system |
| CN113280010B (en) * | 2021-05-11 | 2022-10-21 | 中冶宝钢技术服务有限公司 | Static pressure driving system and method for improving acceleration and deceleration performance of vehicle |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4520625A (en) * | 1982-03-04 | 1985-06-04 | Kabushiki Kaisha Komatsu Seisakusho | Hydraulic brake valve system |
| JPH0781546A (en) * | 1993-09-13 | 1995-03-28 | Toyota Autom Loom Works Ltd | Oil pressure circuit for vehicle traveling |
| CN101216052A (en) * | 2008-01-09 | 2008-07-09 | 浙江大学 | Rotating speed variable driving shield cutterhead energy-saving hydraulic control system |
| JP2009137480A (en) * | 2007-12-07 | 2009-06-25 | Kyoeisha Co Ltd | Hydraulic drive circuit of four-wheeled lawn mower |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2068058U (en) * | 1990-06-27 | 1990-12-26 | 连云港市新浦延中五金机械厂 | Automobile static pressure arranger |
| JP4105557B2 (en) * | 2003-01-30 | 2008-06-25 | 株式会社 神崎高級工機製作所 | Hydraulic continuously variable transmission |
| CN100595440C (en) * | 2007-12-18 | 2010-03-24 | 浙江大学 | Variable frequency pump-control-motor closed circuit based on energy regulation |
| CN102555793B (en) * | 2011-12-15 | 2014-05-14 | 中联重科股份有限公司 | Driving system of engineering machinery and closed hydraulic circuit thereof |
-
2011
- 2011-12-15 CN CN201110423049.4A patent/CN102555793B/en active Active
-
2012
- 2012-09-27 WO PCT/CN2012/082182 patent/WO2013086885A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4520625A (en) * | 1982-03-04 | 1985-06-04 | Kabushiki Kaisha Komatsu Seisakusho | Hydraulic brake valve system |
| JPH0781546A (en) * | 1993-09-13 | 1995-03-28 | Toyota Autom Loom Works Ltd | Oil pressure circuit for vehicle traveling |
| JP2009137480A (en) * | 2007-12-07 | 2009-06-25 | Kyoeisha Co Ltd | Hydraulic drive circuit of four-wheeled lawn mower |
| CN101216052A (en) * | 2008-01-09 | 2008-07-09 | 浙江大学 | Rotating speed variable driving shield cutterhead energy-saving hydraulic control system |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013086885A1 (en) | 2013-06-20 |
| CN102555793A (en) | 2012-07-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102555793B (en) | Driving system of engineering machinery and closed hydraulic circuit thereof | |
| CN103958904B (en) | Based on the system and method for temperature hydraulic control system | |
| CN202517588U (en) | Hydraulic driving device for stirring cylinder of concrete stirring and transporting vehicle | |
| CN202378697U (en) | Travel hydraulic control system and self-propelled engineering machinery applying such control system | |
| CN103790876B (en) | A kind of Closed circuit hydraulic transmission system | |
| CN104591022A (en) | Automatic roller tension hydraulic control system and method of cable winding and unwinding trolley | |
| CN205478612U (en) | Engineering machine tool hydraulic braking system | |
| CN203602243U (en) | Double-power hydraulic material grabbing machine | |
| CN201733013U (en) | Underground pipeline cable and optical cable threading device | |
| CN107906060A (en) | Vehicle parallel type hydraulic hybrid power system and its method with energy regenerating release function | |
| CN202669487U (en) | Two-motor driving device of transit mixer truck | |
| CN104831774A (en) | Loader walking and braking energy recovery auxiliary driving device and control method | |
| CN204296384U (en) | Road rail vehicle | |
| CN104401219A (en) | Power split type hydraulic hybrid power system of loading machine | |
| CN202108032U (en) | Emergency operating device and gate system of winch hoist | |
| CN204369472U (en) | For pile driver bavin electric hybrid drive system and adopt the pile driver of this system | |
| CN103255800A (en) | Engineering machinery electro-hydraulic-mixed low-energy-consumption swing driving system | |
| CN202441281U (en) | Energy-saving hydraulic mechanism for workover rigs | |
| CN202107021U (en) | Axis vehicle hydraulic emergency steering device | |
| CN104515680A (en) | Hydraulic loading closed driving axle testing device | |
| CN204296442U (en) | The power dividing type hydraulic hybrid power system of loader | |
| CN203846420U (en) | Load type hydraulic flexible vehicle obstruction device | |
| CN203528591U (en) | Emergency hydraulic steering system for wheel loader | |
| CN202732555U (en) | Hydraumatic crawler crane motor oil supply and system cooling device | |
| CN202991064U (en) | Drive system for concrete wet-blasting trolley and concrete wet-blasting trolley |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |