CN202624352U - Full hydraulic steering oil path system - Google Patents
Full hydraulic steering oil path system Download PDFInfo
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- CN202624352U CN202624352U CN 201220200405 CN201220200405U CN202624352U CN 202624352 U CN202624352 U CN 202624352U CN 201220200405 CN201220200405 CN 201220200405 CN 201220200405 U CN201220200405 U CN 201220200405U CN 202624352 U CN202624352 U CN 202624352U
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Abstract
The utility model relates to a full hydraulic steering oil path system, which belongs to the technical field of hydraulic transmission. LUDV (Load Independent Flow Distribution) systems are generally used in forklift hydraulic systems at present; when a hydraulic system is in full load to perform composite action, flow is distributed according to a proportion; and if the flow provided by a hydraulic pump cannot simultaneously meet the maximum requirements of a plurality of executing elements, only proportional distribution can be performed, and shortage is produced by the steering system. A hydraulic pump oil path is communicated with a priority valve through an LUDV hydraulic system; an LS port of the priority valve is communicated with an LS port of a pressure sensing port of a full hydraulic steering device, and a communicating oil path is named as a pressure feedback oil path; a CF port of the priority valve is communicated with a P port of an oil inlet of the full hydraulic steering device, and a communicating oil path is named as an oil inlet oil path; and the oil inlet oil path is communicated with a pressure feedback oil path through an oil delivery pipe. After the full hydraulic steering oil path system is adopted, the phenomena of clamping stagnation and heaviness during steering disappear, the working intensity of operation personnel is relieved, and the heating of the system can be effectively reduced.
Description
Technical field
The utility model relates to a kind of hydraulic steering gear of vehicle power steering, relates in particular to a kind of fork truck hydraulic steering gear oil channel structures and improves, and belongs to hydraulic transmission technology field.
Background technology
Fork truck has obtained in the joint-stock company production scene very widely using as a kind of general-duty engineering mechanical device, loading and unloading, the transportation by lighter that is mainly used in spare part, goods, materials and equipments operation such as reach the standard grade.During existing fork truck uses at the scene; Following problem may take place: when this fork truck is in such working process; The pallet fork heavy duty of hoisting is risen, when needing fork truck to turn to operation simultaneously, when first direction or the first return direction; Can produce and turn to clamping stagnation and heavy weight phenomenon, influence the handling and safety of equipment greatly.In the prior art, normal what use is the LUDV hydraulic efficiency pressure system, so-called LUDV system; It is load independence flow distributing system; This type systematic comes the swash plate of control variable Hydraulic Pump with the load pressure of power element, can keep its pressure to power element to supply with in full amount, when the required hydraulic fluid flow rate of power element can provide greater than Hydraulic Pump; System will distribute to each power element with the hydraulic fluid flow rate that Hydraulic Pump provided in proportion, rather than flow to the power element of low load pressure.As shown in Figure 1, this fluid-link steering oil piping system comprises: Hydraulic Pump contains the LUDV hydraulic efficiency pressure system of pressure-compensated valve; Pressure-gradient control valve, all-hydraulic steering gear, wherein; The Hydraulic Pump oil circuit is communicated with pressure-gradient control valve through the LUDV hydraulic efficiency pressure system, and pressure-gradient control valve LS mouth is communicated with all-hydraulic steering gear pressure sensitive mouth LS mouth, and the oil circuit that is communicated with is called the pressure feedback oil circuit; Pressure-gradient control valve CF mouth is communicated with all-hydraulic steering gear oil inlet P mouth, and the oil circuit that is communicated with is called the oil-feed oil circuit.When the hydraulic steering gear control element needs oil pressure; Through all-hydraulic steering gear pressure sensitive mouth pressure demand is fed back to pressure-gradient control valve; Pressure-gradient control valve CF mouth is opened, and provides required oil pressure to the all-hydraulic steering gear oil inlet, when the hydraulic oil in the Hydraulic Pump through after the distribution of pressure-compensated valve; In the time of can reaching the pressure demand of all-hydraulic steering gear, all-hydraulic steering gear can normal operation.But composite move when other control elements such as lift oil tank and deflector; And when the flow of the oil after Hydraulic Pump distributes through pressure-compensated valve can not satisfy the traffic demand of all-hydraulic steering gear; Steering swivel system inevitably produces ullage, causes heavy, the clamping stagnation of direction.
Summary of the invention
The main purpose of the utility model is to the weak point of above-mentioned prior art, under the prerequisite of the hydraulic efficiency pressure system element not being upgraded, to make that hydraulic steering gear can normal operation.
The technical scheme of the utility model is:
A kind of hydro-steering oil piping system comprises Hydraulic Pump 1, contains the LUDV hydraulic efficiency pressure system 5 of pressure-compensated valve, pressure-gradient control valve 3, and all-hydraulic steering gear 2, wherein, Hydraulic Pump 1 oil circuit is communicated with pressure-gradient control valve 3 through LUDV hydraulic efficiency pressure system 5; Pressure-gradient control valve LS mouth is communicated with all-hydraulic steering gear pressure sensitive mouth LS mouth, and the oil circuit that is communicated with is called the pressure feedback oil circuit, and pressure-gradient control valve CF mouth is communicated with all-hydraulic steering gear oil inlet P mouth, and the oil circuit that is communicated with is called the oil-feed oil circuit; Said oil-feed oil circuit and pressure feedback oil circuit are communicated with through transport pipe 7.
The internal diameter of said transport pipe 7 is 10～15mm.
Said transport pipe 7 length are 15～35cm.
Said all-hydraulic steering gear 2 also comprises oil return inlet T, and said oil return inlet T is communicated with the external hydraulic case.
The beneficial effect of the utility model is: clamping stagnation and heavy weight phenomenon disappear when turning to, and performance improves obviously, have alleviated the working strength of operating personal simultaneously, have guaranteed the operation of equipment safety.Can effectively reduce the heating of system; Improve the work efficiency and the maneuvering performance of hydraulic efficiency pressure system, alleviated the working strength of operating personal, guarantee the operation of equipment safety; Because the Occupation coefficient of LUDV system on heavy-duty machinery is increasingly high, the commonality of the utility model has also had corresponding raising.Has good popularizing application prospect.
Description of drawings
Fig. 1 is the oil circuit scheme drawing of the hydrostatic steering system before improving.
Fig. 2 is the oil circuit scheme drawing of the hydrostatic steering system after improving.
Wherein, 1 Hydraulic Pump, 2 all-hydraulic steering gears, 3 pressure-gradient control valves, 4 lift oil tanks, 5LUDV hydraulic efficiency pressure system, 6 hydraulic fluid tanks, 7 transport pipe.
The specific embodiment
Its hydraulic efficiency power unit of CPCD60 type 6t fork truck by two A10V0 profile shafts to pluger type hydraulic pump, its technical parameter: operation pressure: p=300bar, maximum speed of revolution: n=2700r/min, discharge capacity: Vg=45cm
3
The maximum flow of Hydraulic Pump 1: q=Vn=45cm
3╳ 2700r/min=121.5L/min (flow behind the loss of compression is disregarded); The maximum output power of Hydraulic Pump: P=pq/60=30Mpa ╳ 121.5L/min/60=60.75KW (difference of pressure is ignored)
Distribution system is responsible for by 5M7-22 type multiway valve, as the core parts of LUDV system---pressure-compensated valve promptly is installed on the multiple directional control valve.1 of Hydraulic Pump provides the required flow of each hydraulic actuator following:
All-hydraulic steering gear: 45L/min;
Lift oil tank: 80L/min;
Hydraulic Pump 1 control all-hydraulic steering gear and lift oil tank.
When existing CPCD60 type fork truck carries out operation in factory building; The demand that lift oil tank 4 and 2 while of all-hydraulic steering gear full load standard-sized sheet are arranged; Truck driver is taked maximum throttle control (rotating speed that is Hydraulic Pump is 2700r/min), so the delivery rate of Hydraulic Pump is calculated as 121.5L/min according to preamble, offering the traffic demand that turns to oil cylinder during the deflector full-load operation is 45L/min; And the input flow rate demand of lift oil tank is 80L/min; In case turn to oil cylinder and lift oil tank simultaneously during standard-sized sheet, its needed total input flow rate is 80+45=125L/min, surpasses the delivery rate 121.5L/min of Hydraulic Pump 1 at maximum speed of revolution 2700r/min; Under the influence of LUDV system, the flow pro-rata:
Calculate: ratio i=121.5/125=0.972
At this moment, being dispensed to the flow that turns to oil cylinder is 0.972 * 45=43.74L/min.
With reference to Fig. 1,2, this deflector has 5 interfaces, is respectively:
P: oil inlet.The pressure oil that provides after the Hydraulic Pump 1 process LUDV system is from this mouthful entering.
T: return opening.The oil return of all-hydraulic steering gear is flowed back to hydraulic fluid tank 6 from this mouth.
LS: signal port.When turning to, send the pressure signal of demand from this mouthful, control pressure-gradient control valve CF mouth is opened, and pressure oil gets into the P mouth through pressure-gradient control valve.
A, B: working hole.Pressure oil gets into the fluid-link steering power element from this mouth, implements handling maneuver.
With reference to Fig. 2, pressure-gradient control valve LS mouth is communicated with all-hydraulic steering gear signal port LS, and the oil circuit that is communicated with is called the LS oil circuit, and pressure-gradient control valve CF mouth is communicated with the all-hydraulic steering gear oil inlet P, and the oil circuit that is communicated with is called the P oil circuit; Is that 10～15mm, length are that the transport pipe 7 of 15～35cm is communicated with LS oil circuit and P mouth oil circuit through internal diameter, when turning to, when deflector proposes work requirements, provides pressure signal to pressure-gradient control valve, and the required hydraulic fluid flow rate of this process is 3L/min.
Concrete working process is: when Hydraulic Pump 1 was operated with full load, Hydraulic Pump rotating speed this moment was for the highest, i.e. 2700r/min; Hydraulic Pump real output flow 121.5L/min, meanwhile, deflector also proposes job requirements; After pressure-gradient control valve receives the demand pressure signal, open at once main system and and deflector P mouth between oil circuit, carry out providing of pressure oil; Be multiple working this moment, because the effect of LDUV pressure-compensated valve, the flow that system provides is merely 43.74L/min; The pressure oil of the 3L/min flow in the LS oil circuit has been accomplished the mission that its initial pressure signal provides at this moment; Implement its another function, promptly pressure oil directly gets into the P mouth of deflector from the new connection oil circuit, and fellowship turns to the operation of oil cylinder.Therefore both flow additions.Total flow is 46.74L/min, has satisfied the full load running of deflector.Unnecessary hydraulic oil (46.74-45=1.74L/min) flows back to hydraulic fluid tank 6 through the built-in by pass valve of deflector through oil return T mouth.
Claims (4)
1. a hydro-steering oil piping system comprises Hydraulic Pump (1), contains the LUDV hydraulic efficiency pressure system (5) of pressure-compensated valve; Pressure-gradient control valve (3); All-hydraulic steering gear (2), wherein, Hydraulic Pump (1) oil circuit is communicated with pressure-gradient control valve (3) through LUDV hydraulic efficiency pressure system (5);
Pressure-gradient control valve LS mouth is communicated with all-hydraulic steering gear pressure sensitive mouth LS mouth, and the oil circuit that is communicated with is called the pressure feedback oil circuit, and pressure-gradient control valve CF mouth is communicated with all-hydraulic steering gear oil inlet P mouth, and the oil circuit that is communicated with is called the oil-feed oil circuit;
It is characterized in that: said oil-feed oil circuit and pressure feedback oil circuit are communicated with through transport pipe (7).
2. hydro-steering oil piping system as claimed in claim 1 is characterized in that: the internal diameter of said transport pipe (7) is 10～15mm.
3. hydro-steering oil piping system as claimed in claim 1 is characterized in that: said transport pipe (7) length is 15～35cm.
4. hydro-steering oil piping system as claimed in claim 1 is characterized in that said all-hydraulic steering gear (2) also comprises oil return inlet T, and said oil return inlet T is communicated with the external hydraulic case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220200405 CN202624352U (en) | 2012-05-07 | 2012-05-07 | Full hydraulic steering oil path system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220200405 CN202624352U (en) | 2012-05-07 | 2012-05-07 | Full hydraulic steering oil path system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202624352U true CN202624352U (en) | 2012-12-26 |
Family
ID=47377576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220200405 Expired - Fee Related CN202624352U (en) | 2012-05-07 | 2012-05-07 | Full hydraulic steering oil path system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202624352U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110254509A (en) * | 2019-06-20 | 2019-09-20 | 宁波易捷环卫设备有限公司 | A kind of road sweeper dynamic load sensing all hydraulic pressure steering-gear |
| CN110848185A (en) * | 2019-11-11 | 2020-02-28 | 雷沃工程机械集团有限公司 | Hydraulic control system and method for wheel type engineering machinery |
-
2012
- 2012-05-07 CN CN 201220200405 patent/CN202624352U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110254509A (en) * | 2019-06-20 | 2019-09-20 | 宁波易捷环卫设备有限公司 | A kind of road sweeper dynamic load sensing all hydraulic pressure steering-gear |
| CN110848185A (en) * | 2019-11-11 | 2020-02-28 | 雷沃工程机械集团有限公司 | Hydraulic control system and method for wheel type engineering machinery |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121226 Termination date: 20150507 |
|
| EXPY | Termination of patent right or utility model |