CN102556153B - Steering hydraulic drive system for vehicle - Google Patents
Steering hydraulic drive system for vehicle Download PDFInfo
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- CN102556153B CN102556153B CN201110459652.8A CN201110459652A CN102556153B CN 102556153 B CN102556153 B CN 102556153B CN 201110459652 A CN201110459652 A CN 201110459652A CN 102556153 B CN102556153 B CN 102556153B
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Abstract
The invention discloses a steering hydraulic drive system for a vehicle. The steering hydraulic drive system comprises a variable plunger pump (1.1) and a quantitative plunger motor (1.2) which form a circuit. The steering hydraulic drive system further comprises a ball valve (4.5), a shuttle valve (4.6), a main overflow valve (4.1), a pilot overflow valve (4.2) and a pilot direction control device, wherein a valve core is arranged in a cavity of the main overflow valve (4.1); an upper first oil port, an upper second oil port, an oil discharge port and a spring are arranged at the upper part of the cavity of the main overflow valve; the upper first oil port, the upper second oil port and the oil discharge port are communicated to the cavity of the main overflow valve; the spring pushes the valve core downwards; and a lower first oil port and a lower second oil port which are plugged by a plugging valve core under the pushing of the spring are arranged at the lower part of the cavity of the main overflow valve. The steering hydraulic drive system for the vehicle has a simple structure and low failure rate, and can automatically play the protection role.
Description
Technical field
The invention belongs to hydraulic technique field, relate in particular to a kind of steering hydraulic drive system for vehicle.
Background technology
The steering hardware of current existing vehicle adopts motor to drive conventionally, but for heavy-duty vehicle, as vehicles such as elevator machinery or tanks, because the weight of vehicle own is very large, with motor, drives enough propulsive efforts cannot be provided, and conventionally adopts hydraulic-driven for this reason.But the baroque problem of existing steering hydraulic drive system for vehicle ubiquity, once and the problem that also existence has fault to occur causing hydraulic circuit obstruction and then damage whole system.
Summary of the invention
For this reason, technical matters to be solved by this invention is to provide a kind of simple in structure, steering hydraulic drive system for vehicle that can play self-protection while breaking down, the deficiency existing to overcome prior art.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A steering hydraulic drive system for vehicle, comprises the Variable plunger pump 1.1 and the quantitative plunger motor 1.2 that form loop, it is characterized in that: also include ball valve 4.5, shuttle valve 4.6, main by pass valve 4.1, precursor overflow valve 4.2 and guide's directional controller;
Described main by pass valve 4.1 has spool in valve pocket, the spring that described valve pocket top has upper the first hydraulic fluid port being communicated in valve spring chamber, upper the second hydraulic fluid port, unloading port and described spool is resetted downwards, described valve pocket bottom has lower the first hydraulic fluid port and lower the second hydraulic fluid port being separated by spool shutoff under action of the spring;
Lower first hydraulic fluid port of described main by pass valve 4.1, the C oil inlet of ball valve 4.5, the A oil inlet of shuttle valve 4.6 are all communicated on first oil circuit in left side of quantitative plunger motor 1.2, and lower second hydraulic fluid port of described main by pass valve 4.1, the D oil inlet of ball valve, the B oil inlet of shuttle valve 4.6 are all communicated on second oil circuit on right side of quantitative plunger motor 1.2;
The P oil outlet of described shuttle valve 4.6 is constant to be drawn upper first hydraulic fluid port of low pressure oil by main by pass valve 4.1 and enters valve spring chamber, and the constant high pressure oil that draws of M oil outlet of described ball valve 4.5 is connected to upper second hydraulic fluid port of main by pass valve 4.1 through first throttle valve 5.1; And through unloading port, second flow regulating valve 5.2 of described main by pass valve 4.1, system high pressure oil is connected to precursor overflow valve 4.2.
Described guide's directional controller 3 consists of oil cylinder 3.1 and directional control valve 3.2, the left side oil pocket of described oil cylinder 3.1 is communicated to the E hydraulic fluid port of directional control valve 3.2, the right side oil pocket of oil cylinder 3.1 is communicated to the F hydraulic fluid port of directional control valve 3.2, the G hydraulic fluid port of directional control valve 3.2 connects separately oil circuit control 400 or is communicated with slippage pump 6.1 through the first check valve 6, the H hydraulic fluid port of directional control valve 3.2 is communicated with fuel tank, and the piston of described oil cylinder 3.1 is by connecting rod shifting fork device control variable plunger pump 1.1 swash plate pivot angles.
In the present invention, also include flush valve 2.2, the X oil inlet of described flush valve 2.2 is communicated with first oil circuit in the left side of quantitative plunger motor 1.2, the Y oil inlet of described flush valve 2.2 is communicated with second oil circuit on the right side of quantitative plunger motor 1.2, and the Z of described flush valve 2.2 rinses that hydraulic fluid port is constant to be drawn low pressure oil is communicated to Variable plunger pump 1.1 and quantitative plunger motor 1.2 housing inner chamber through the 3rd flow regulating valve 5.3 and by native system, reveal oil circuit 300 and discharge.
Adopt technique scheme, steering hydraulic drive system for vehicle of the present invention is simple in structure, failure rate is low, can carry out the advantage of self-protection.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is elaborated:
Fig. 1 is system architecture schematic diagram of the present invention.
The specific embodiment
As shown in Figure 1, steering hydraulic drive system for vehicle of the present invention, comprise directional controller 3, form Variable plunger pump 1.1, quantitative plunger motor 1.2 and ball valve 4.5, shuttle valve 4.6, main by pass valve 4.1, precursor overflow valve 4.2, flush valve 2.2, oil compensating safety valve 8, oil circuit control safety valve 5 and two second check valves 2.1 etc. in loop.
Wherein, loop comprises the first loop 100 that is positioned at quantitative plunger motor 1.2 left sides and the second servo loop 200 that is positioned at quantitative plunger motor 1.2 right sides.
Guide's directional controller 3 consists of oil cylinder 3.1 and directional control valve 3.2, the left side oil pocket of oil cylinder 3.1 is communicated to the E hydraulic fluid port of directional control valve 3.2, the right side oil pocket of oil cylinder 3.1 is communicated to the F hydraulic fluid port of directional control valve 3.2, the G hydraulic fluid port of directional control valve 3.2 is communicated with oil pump 6.1 through the oil inlet of first check valve 6(the first check valve 6) be communicated to additional slippage pump 6.1, the H hydraulic fluid port of directional control valve 3.2 is communicated with leakage oil circuit 300 oil sump tanks, and the G hydraulic fluid port of directional control valve 3.2 also connects control presssure safety valve 5.The piston of oil cylinder 3.1, by connecting rod link variable plunger pump 1.1, to drive swash plate direction of tilt and the angle of inclination in Variable plunger pump 1.1, is realized and is changed the hydraulic oil flow direction and horsepower output.Directional control valve 3.2 connects joystick, by the motion of its inner spool, can realize respectively two kinds of mode of communicating, and the first is that E hydraulic fluid port and G hydraulic fluid port are communicated with, and F hydraulic fluid port and H hydraulic fluid port are communicated with, and the second is that G hydraulic fluid port and F hydraulic fluid port are communicated with, and E hydraulic fluid port and H hydraulic fluid port are communicated with.Like this just can realize by changing the sense of motion of oil cylinder 3.1 inner carriers the commutation of Variable plunger pump 1.1, hydraulic oil high-low voltage oil circuit in loop is changed, and then the rotation direction of quantitative plunger motor 1.2 is changed, realize the object of commutation.
On Variable plunger pump 1.1, also the second check valve 2.1 of pair of opposing in parallel is as repairing oil-feed selector valve, and no matter how high-low pressure switches for the first oil circuit and the second oil circuit, can guarantee the constant low pressure oil way that enters of system repairing.
Main by pass valve 4.1 has spool in valve pocket, the spring that valve pocket top has upper the first hydraulic fluid port being communicated in valve pocket, upper the second hydraulic fluid port, unloading port and described spool is resetted downwards, valve pocket bottom has under action of the spring by lower first hydraulic fluid port of spool shutoff, lower the second hydraulic fluid port, lower the 3rd hydraulic fluid port.
Ball valve 4.5 has C oil inlet, D oil inlet and M oil outlet, by the rolling of steel ball in it, can realize respectively the connection of C oil inlet and M oil outlet or the connection of D oil inlet and M oil outlet.
Shuttle valve 4.6 has A oil inlet, B oil inlet and P oil outlet, and its two ends are by perception oil pressure size and compare and decide A oil inlet and P oil inlet to be communicated with or B oil inlet and P oil outlet are communicated with.
Lower first hydraulic fluid port of main by pass valve 4.1, the C oil inlet of ball valve 4.5, the A oil inlet of shuttle valve 4.6 are all communicated on first oil circuit in left side of quantitative plunger motor 1.2, and lower second hydraulic fluid port of main by pass valve 4.1, lower the 3rd hydraulic fluid port, the D oil inlet of ball valve, the B oil inlet of shuttle valve 4.6 are all communicated on second oil circuit on quantitative plunger motor 1.2 right sides;
The P oil outlet of shuttle valve 4.6 is communicated to upper first hydraulic fluid port of main by pass valve 4.1, and the M oil outlet of ball valve 4.5 is connected to upper second hydraulic fluid port of main by pass valve 4.1 through first throttle valve 5.1; The unloading port of main by pass valve 4.1 is connected to precursor overflow valve 4.2, electromagnet cut off valve 4.3 and manual shutoff valve 4.4 through the second flow regulating valve 5.2.
In addition, also include flush valve 2.2, flush valve 2.2 has respectively X oil inlet, Y oil inlet and Z oil outlet, under valve core movement, can realize respectively the connection of connection, Y oil inlet and the Z oil outlet of X oil inlet and Z oil outlet within it.Wherein, the X oil inlet of flush valve 2.2 is communicated with first oil circuit in the left side of quantitative plunger motor 1.2, the Y oil inlet of flush valve 2.2 is communicated with second oil circuit on the right side of quantitative plunger motor 1.2, and the Z of flush valve 2.2 rinses hydraulic fluid port through the 3rd flow regulating valve 5.3 and leaks the housing inner chamber that oil circuit 300 is communicated to Variable plunger pump 1.1 and quantitative plunger motor 1.2.
Be exactly more than steering hydraulic drive system for vehicle of the present invention, its mode of operation is as follows:
Variable plunger pump 1.1 rotates under driven by motor, by controlling directional control valve 3.2, can control left side oil pocket or the right side oil pocket that hydraulic oil enters oil cylinder 3.1, thereby drive the piston in oil cylinder 3.1, and then drive direction of tilt and the angle of inclination of swash plate in Variable plunger pump 1.1, and then can to realize hydraulic oil (high pressure oil) be to enter quantitative plunger motor 1.2 or enter quantitative plunger motor 1.2 from second oil circuit on right side from first oil circuit in left side, thereby control the rotation direction of the output shaft of quantitative plunger motor 1.2, and then reach the object turning to.
Shuttle valve 4.6 structures assurance connections are drawn low pressure oil and are entered main by pass valve 4.1 spring cavitys (upper the first hydraulic fluid port); Ball valve 4.2 structures assurance connections are drawn high pressure oil and are entered the second hydraulic fluid port on main by pass valve 4.1, and Bing Jing unloading port and the second flow regulating valve 5.2 are connected to precursor overflow valve 4.2, electromagnet cut off valve 4.3 and manual shutoff valve 4.4; Main by pass valve 4.1 due under the hydraulic oil of spring, valve pocket internal upper part and the combined action of bottom hydraulic oil, its inner spool blocks down the first hydraulic fluid port, lower the second hydraulic fluid port, lower the 3rd hydraulic fluid port, the upper and lower force balance of main by pass valve.
The first oil circuit of supposing left side is high pressure oil, when system occurs when abnormal, during the instantaneous rising of left side the first oil circuit pressure, at this moment the oil pressure instantaneous value that enters the first hydraulic fluid port of main by pass valve 4.1 bottoms will be much larger than entering upper first hydraulic fluid port on main by pass valve 4.1 tops and hydraulic fluid pressure and the spring force of upper the second hydraulic fluid port, therefore promote spool upward movement, thereby make the first hydraulic fluid port and the second hydraulic fluid port be communicated with (hydraulic oil on top is laid down by unloading port), make the first oil circuit and the second oil circuit directly be communicated with, play pressure release effect, Variable plunger pump and quantitative plunger motor in protection system.Otherwise if second oil circuit on right side is high-pressure oil passage, the stressing conditions of main relief valve spool both sides is the same.
By foregoing detailed description, can find out, steering hydraulic drive system for vehicle of the present invention has simple in structure, failure rate is low, can carry out the advantage of self-protection.
But, those of ordinary skill in the art will be appreciated that, above embodiment is only for the present invention is described, and be not used as limitation of the invention, as long as within the scope of connotation of the present invention, to the variation of the above embodiment, modification, all will drop within the scope of claims of the present invention.
Claims (5)
1. a steering hydraulic drive system for vehicle; comprise the Variable plunger pump (1.1) and the quantitative plunger motor (1.2) that form loop, it is characterized in that: also include ball valve (4.5), shuttle valve (4.6), main by pass valve (4.1), precursor overflow valve (4.2) and guide's directional controller;
Described main by pass valve (4.1) has spool in valve pocket, the spring that described valve pocket top has upper the first hydraulic fluid port being communicated in valve spring chamber, upper the second hydraulic fluid port, unloading port and described spool is resetted downwards, described valve pocket bottom has lower the first hydraulic fluid port and lower the second hydraulic fluid port being separated by spool shutoff under action of the spring;
The A oil inlet of lower first hydraulic fluid port of described main by pass valve (4.1), the C oil inlet of ball valve (4.5), shuttle valve (4.6) is all communicated on first oil circuit in left side of quantitative plunger motor (1.2), and the B oil inlet of lower second hydraulic fluid port of described main by pass valve (4.1), the D oil inlet of ball valve (4.5), shuttle valve (4.6) is all communicated on second oil circuit on right side of quantitative plunger motor (1.2);
The P oil outlet of described shuttle valve (4.6) is constant to be drawn upper first hydraulic fluid port of low pressure oil by main by pass valve (4.1) and enters valve spring chamber, and the constant high pressure oil that draws of M oil outlet of described ball valve (4.5) is connected to upper second hydraulic fluid port of main by pass valve (4.1) through first throttle valve (5.1); And through unloading port, second flow regulating valve (5.2) of described main by pass valve (4.1), system high pressure oil is connected to precursor overflow valve (4.2);
Described guide's directional controller (3) consists of oil cylinder (3.1) and directional control valve (3.2), the left side oil pocket of described oil cylinder (3.1) is communicated to the E hydraulic fluid port of directional control valve (3.2), the right side oil pocket of oil cylinder (3.1) is communicated to the F hydraulic fluid port of directional control valve (3.2), the G hydraulic fluid port of directional control valve (3.2) connects separately oil circuit control (400) or is communicated with slippage pump (6.1) through the first check valve (6), the H hydraulic fluid port of directional control valve (3.2) is communicated with fuel tank, the piston of described oil cylinder (3.1) is by connecting rod shifting fork device control variable plunger pump (1.1) swash plate pivot angle.
2. steering hydraulic drive system for vehicle according to claim 1, it is characterized in that: also include flush valve (2.2), the X oil inlet of described flush valve (2.2) is communicated with the left side oil circuit of quantitative plunger motor (1.2), the Y oil inlet of described flush valve (2.2) is communicated with the right side oil circuit of quantitative plunger motor (1.2), and the Z of described flush valve (2.2) rinses hydraulic fluid port and through the 3rd flow regulating valve (5.3), is communicated to the housing inner chamber of Variable plunger pump (1.1) and quantitative plunger motor (1.2).
3. steering hydraulic drive system for vehicle according to claim 1, is characterized in that: described the second flow regulating valve (5.2) is also connected to electromagnet cut off valve (4.3) and manual shutoff valve (4.4).
4. steering hydraulic drive system for vehicle according to claim 1, is characterized in that: also comprise two the second check valves (2.1), after the oil inlet of described two the second check valves (2.1) interconnects, be connected to slippage pump (6.1).
5. steering hydraulic drive system for vehicle according to claim 4, is characterized in that: the oil inlet of described two the second check valves (2.1) is also connected to low-pressure safety valve (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110459652.8A CN102556153B (en) | 2011-12-31 | 2011-12-31 | Steering hydraulic drive system for vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110459652.8A CN102556153B (en) | 2011-12-31 | 2011-12-31 | Steering hydraulic drive system for vehicle |
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| Publication Number | Publication Date |
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| CN102556153A CN102556153A (en) | 2012-07-11 |
| CN102556153B true CN102556153B (en) | 2014-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110459652.8A Active CN102556153B (en) | 2011-12-31 | 2011-12-31 | Steering hydraulic drive system for vehicle |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104192202B (en) * | 2014-09-05 | 2016-07-06 | 徐工集团工程机械股份有限公司科技分公司 | Loading machine steering hydraulic system with shuttle valve structure |
| CN108506256A (en) * | 2018-03-27 | 2018-09-07 | 江苏恒立液压科技有限公司 | Drive hydraulic control system |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200961671Y (en) * | 2006-08-23 | 2007-10-17 | 泰安龙泰机械有限公司 | Hydraulic transmission, work device of loader |
| CN200945862Y (en) * | 2006-09-14 | 2007-09-12 | 范建喜 | Mining explosion-proof rail common-track locomotive hydraulic transmission gear |
| US20080238187A1 (en) * | 2007-03-30 | 2008-10-02 | Stephen Carl Garnett | Hydrostatic drive system with variable charge pump |
| CN101413521B (en) * | 2008-11-28 | 2011-05-04 | 西安建筑科技大学 | Experimental apparatus and method for obtaining multi-source diagnostic information of hydraulic equipment |
| CN201461362U (en) * | 2009-05-05 | 2010-05-12 | 上海电气液压气动有限公司 | Variable control mechanism of plunger piston variable pump |
| CN202608868U (en) * | 2011-12-31 | 2012-12-19 | 上海电气液压气动有限公司 | Steering hydraulic drive system for vehicle |
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