CN106593969B - Electrohydraulic controlling mechanism - Google Patents
Electrohydraulic controlling mechanism Download PDFInfo
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- CN106593969B CN106593969B CN201611033967.5A CN201611033967A CN106593969B CN 106593969 B CN106593969 B CN 106593969B CN 201611033967 A CN201611033967 A CN 201611033967A CN 106593969 B CN106593969 B CN 106593969B
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- Prior art keywords
- pressure
- chamber
- push rod
- hydraulic oil
- variable pump
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Classifications
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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
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/26—Control
- F04B1/28—Control of machines or pumps with stationary cylinders
- F04B1/29—Control of machines or pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
- F04B1/295—Control of machines or pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/26—Control
- F04B1/30—Control of machines or pumps with rotary cylinder blocks
- F04B1/32—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block
- F04B1/324—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/001—Servomotor systems with fluidic control
-
- 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
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
-
- 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
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/255—Flow control functions
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a kind of electrohydraulic controlling mechanisms, it include: the first servo unit and fixed pressure reducing valve, which to generate pressure difference, to generate pressure signal, the pressure signal is converted to the mechanical signal of the first servo unit, to control the discharge capacity of plunger variable pump.The present invention is due to being provided with fixed pressure reducing valve, so that system pressure and plunger variable pump establish servo relationship, so that plunger variable be enable to be adjusted according to column system pressure.
Description
Technical field
The present invention relates to field of electromechanical technology more particularly to a kind of electrohydraulic controlling mechanisms.
Background technique
In fluid power system and hydraulic control system (the two might as well be referred to as hydraulic system), system pressure or work pressure
The size of power is by multiple units or system co- controlling and determines, for example, in general, the discharge capacity such as variable pump does not vary widely
When, the system pressure of hydraulic system is mainly limited by overflow valve, when system pressure is more than the control pressure of overflow valve, overflow valve
So that pressure is revert to the system pressure of setting and to fuel tank draining, and is to have by the fluctuation of overflow valve control system pressure
Limit, in other words, when the discharge capacity of variable pump varies widely, if the discharge capacity of variable pump becomes larger, even if overflow valve is constantly let out
System pressure will not be reduced to setting pressure by oil, and so overflow valve will soon damage.Therefore, it is necessary to regulated variable pumps
Discharge capacity.
Occur the mechanism and method of a variety of adjustings or change variable pumpage, e.g., plunger variable pump in the prior art
Discharge capacity can be changed by changing the gradient of swash plate, the gradient of swash plate is adjusted by being provided with the servo piston of connecting rod, specifically,
Servo piston is arranged in servo piston chamber, and connecting rod stretches out from one end of servo piston chamber and pass through flexible change swash plate gradient,
Servo piston chamber is drawn hydraulic oil all the way from the oil outlet of plunger variable pump and is passed through not with spring is provided in the chamber of connecting rod
Have in the chamber of piston rod, the stroke that connecting rod is changed by the hydraulic fluid pressure size, thus change the gradient of swash plate, into
And change the discharge capacity of plunger variable pump.However, this method can only be simple the discharge capacity for changing variable pump, can only be used in
Known or precognition system needed under discharge capacity, for the substantially discharge capacity of regulated variable pump before using variable pump, this method is simultaneously
Not according to the discharge capacity of system pressure real-time regulated variable pump so that the discharge capacity of variable pump meets operating pressure requirement, in other words this
Kind method can only make the discharge capacity after adjusting generally conform to system requirements, and precision is poor.
The method of another pilot plunger variable pump is had also appeared in the prior art, on the one hand, is obtained by angular transducer
The gradient of the swash plate of variable pump is obtained, which passes to electromagnetic controller for steepness signals, have in electromagnetic controller
With the one-to-one electric signal of gradient；On the other hand, the hydraulic oil two-way of system respectively enters two chambers divided by piston
In, the connecting rod on the piston passes through with the mobile gradient for changing swash plate of piston；When controller needs to change the row of variable pump
When amount, controller changes the pressure of two-way hydraulic oil, to change the displacement of piston, and then changes the discharge capacity of variable pump.So
And this method only keeps the gradient of the swash plate of variable pump associated with the electric signal of controller, and the pressure of hydraulic system is
As the simple power for changing piston transverse shifting, and it is associated there is no the discharge capacity with variable pump, to make this method
The discharge capacity that cannot be pumped according to system pressure come regulated variable, so that the discharge capacity after adjusting can only be made to generally conform to system requirements, essence
It spends poor.
Summary of the invention
For the above-mentioned technical problems in the prior art, the embodiment provides a kind of in real time according to being
The discharge capacity of the pressure signal regulated variable pump for hydraulic oil feedback of uniting is so that system pressure meets the electrohydraulic controlling mechanism of predetermined pressure.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
A kind of electrohydraulic controlling mechanism, for adjusting the pressure of hydraulic system, packet by the discharge capacity for changing plunger variable pump
It includes:
First servo unit comprising be formed with the first shell of first chamber, be arranged in the first chamber, and will
The first chamber is divided into the first servo piston of the first left chamber and the first right chamber；It is provided in first left chamber
For pushing against the first spring of first servo piston, the first push rod is provided on first servo piston；
Second servo unit comprising be formed with the second shell of second chamber, be arranged in the second chamber, and will
The second chamber be divided into the second left chamber and the second right chamber the second servo piston and with second servo piston
Second spring is respectively provided in the second push rod being fixedly connected, second left chamber and second right chamber, described second pushes away
Bar is used to drive the swash plate, and: when second push rod moves to left, the gradient of the swash plate reduces, second push rod
When moving to right, the gradient of the swash plate increases；
Two control units, two described control units are arranged side by side and include being formed with the valve body of valve chamber and being arranged in institute
The spool in valve chamber is stated, first push rod is simultaneously connect with two spools simultaneously between the spool, and system liquid
Pressure oil by one of described control unit to second left chamber fuel feeding, by another described control unit to described
Second right chamber fuel feeding, so that:
When first push rod is moved to the left, first push rod drives two spools mobile so as to be passed through institute simultaneously
The pressure for stating the indoor hydraulic oil of the second right chamber is greater than the pressure of the indoor hydraulic oil of the second left chamber, when first push rod
When moving right, first push rod drives two spools mobile so as to be passed through the indoor hydraulic oil of the second right chamber simultaneously
Pressure be less than the indoor hydraulic oil of the second left chamber pressure.
The electrohydraulic controlling mechanism further includes
Fixed pressure reducing valve, system hydraulic oil are divided into two-way and each lead into first left chamber and first right chamber,
The fixed pressure reducing valve is arranged on the pipeline for being passed through first left chamber, so that the indoor hydraulic oil of the first left chamber
Pressure is kept constant, so that the pressure of the pressure of the indoor hydraulic oil of the first right chamber and the indoor hydraulic oil of the first left chamber
The difference of power increases with the increase of system pressure.
Preferably, two described control units are proportional reversing valve, the oil outlet of two proportional reversing valves respectively with institute
It states the second left chamber to be connected to second right chamber, oil inlet is connected to system hydraulic oil, and when two spools are with described
When first push rod level is moved to the left, the oil outlet pressure being connected to second left chamber is less than to be connected with second right chamber
Logical oil outlet pressure；When two spools move horizontally to the right with first push rod, it is connected to second left chamber
Oil outlet pressure be greater than the oil outlet pressure that is connected to second right chamber.
Compared with prior art, the beneficial effect of electrohydraulic controlling mechanism provided by the embodiment of the present invention is: the present invention
Due to being provided with fixed pressure reducing valve, so that system pressure and plunger variable pump establish servo relationship, to enable plunger variable
It is enough to be adjusted according to column system pressure.In addition, two control units can control the second push rod of the second servo unit, make second
Push rod is quick on the draw.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of electrohydraulic controlling mechanism of the invention.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, with reference to the accompanying drawing and specific embodiment party
Formula elaborates to the present invention.
Electrohydraulic controlling mechanism objects, technical solutions and advantages of the invention for convenience of explanation are introducing electricity of the invention
Before liquid control mechanism, introducing first in the prior art is the discharge capacity and this kind which kind of mode to change variable pump by
The main Ying Yu of mode is in which kind of situation.
Variable pump in the prior art, especially plunger variable pump 50 are usually become by changing the gradient of swash plate 51 to change
The discharge capacity for measuring pump needs the flow according to hydraulic system to hydraulic oil before variable pump is accessed hydraulic system as power source
It is required that, system pressure requirements and operating pressure require that the discharge capacity of variable pump is adjusted, that is to say, that the oblique of variable pump
The gradient of disk 51 is adjusted, so that the discharge capacity of variable pump generally conforms to the requirement of hydraulic system, to make variable pump access system
After system, the pressure remained steady of hydraulic system.
Under normal conditions, flow, system pressure and the operating pressure of the discharge capacity and hydraulic system of variable pump are to be positively correlated
, that is to say, that in same hydraulic system, the discharge capacity of variable pump is bigger, flow, system pressure and the work of hydraulic system
Pressure is also bigger, otherwise smaller.After the discharge capacity of variable pump determines, flow, system pressure and the work pressure of hydraulic system
Power can be determined substantially in a certain range.However, the discharge capacity of variable pump and do not have with the flow of hydraulic system, system pressure with
And the completely corresponding relationship of operating pressure, for example, system pressure does not have and the discharge capacity simultaneously when the discharge capacity of variable pump is Xv/s
Unique corresponding one determines pressure, and system pressure at this time may change or fluctuate in a big way, and this fluctuation
The range that may allow beyond system pressure, e.g., rated pressure beyond system (under the rated pressure, each member of system
Device could work normally).So that the discharge capacity and the flow of hydraulic system of variable pump, system pressure and operating pressure are incomplete
Corresponding one it is critically important the reason is that: in system each Hydraulic Elements draining, oil leak and Hydraulic Elements to hydraulic oil generate not
Variation and the aging of Hydraulic Elements of evitable resistance etc..
And discharge capacity and the system parameters of variable pump are all built upon for one by one to the adjusting of hydraulic system in the prior art
What the case where corresponding relationship, carried out, for example, be intended to adjust system pressure to a certain pressure value, it only need to be by the swash plate 51 of variable pump
Pitch adjustment to a certain discharge capacity of the unique corresponding variable pump of the pressure value.That is, only needing swash plate 51 individually
Adjust a certain predetermined slant.
For example, the gradient of swash plate 51 is adjusted by being provided with the servo piston of connecting rod, specifically, servo piston setting is being watched
It takes in plunger shaft, connecting rod stretches out from one end of servo piston chamber and passes through flexible change 51 gradient of swash plate, and servo piston chamber has
It is provided with spring in the chamber of connecting rod, draws the chamber that hydraulic oil all the way is passed through not piston rod from the oil outlet of plunger variable pump 50
In room, the stroke for changing connecting rod by the hydraulic fluid pressure size to change the gradient of swash plate 51, and then changes plunger
The discharge capacity of variable pump 50.
For another example on the one hand, the gradient of the swash plate 51 of variable pump is obtained by angular transducer, which will be oblique
Degree signal passes to electromagnetic controller, has and the one-to-one electric signal of gradient in electromagnetic controller；On the other hand, system
Hydraulic oil two-way respectively enters in two chambers by piston segmentation, connecting rod on the piston by with piston it is mobile for changing
The gradient of swash plate 51；When controller needs to change the discharge capacity of variable pump, controller changes the pressure of two-way hydraulic oil, to change
Become the displacement of piston, and then changes the discharge capacity of variable pump.
Above two method be built upon variable pump discharge capacity and system parameters be one-to-one relationship the case where into
Capable, however, it can be seen from the above, the discharge capacity of variable pump is with system parameters because many factors do not constitute completely corresponding pass
System, so that the discharge capacity for changing variable pump that this method can only be simple, can only be used in and know or predicting system
Needed for uniting under discharge capacity, the substantially discharge capacity of regulated variable pump before using variable pump.
In above-mentioned method of adjustment in the prior art, system hydraulic oil is intended only as changing piston transverse shifting merely
Power, and there is no the discharge capacity with variable pump is associated.Entire adjustment process relies on controller completely and feeds back to controller
The gradient of swash plate 51 carry out, being adjusted in real time according to hydraulic system pressure, mutually isolated with hydraulic system.
One bigger drawback of above-mentioned adjusting method is: since variable pump is used for a long time, a certain gradient of swash plate 51
Corresponding discharge capacity can change, so that the discharge capacity of the numerical value stored in controller and variable pump is made to generate deviation, so that:
When controller issues the instruction that the adjusting of swash plate 51 makes variable pump adjusting to corresponding discharge capacity to a certain gradient, on variable pump
Although swash plate 51 adjust and arrive predetermined slant, discharge capacity is not up to pre- fixed displacement.
The degree of regulation for carrying out the method for regulating system pressure above by the discharge capacity that regulated variable pumps is inadequate or tune is not achieved
The expected reason of section is: the discharge capacity of variable pump according to system pressure being adjusted, and only simple regulated variable
The discharge capacity of pump.The purpose of electrohydraulic controlling mechanism of the invention is the relationship of the discharge capacity for the pressure and variable pump for establishing hydraulic system, i.e.,
After establishing adjusts the discharge capacity of variable pump carries out according to system pressure, and the discharge capacity of variable pump is adjusted and system pressure can be influenced
Servo relationship.
As shown in Figure 1, embodiment of the invention discloses a kind of electrohydraulic controlling mechanism, for by changing plunger variable pump
50 discharge capacity adjusts the pressure of hydraulic system, which specifically includes: the first servo unit 10, the second servo list
First 20, two control units 30 and fixed pressure reducing valve 40.
First servo unit 10 includes the first shell for being formed with first chamber, is arranged in first chamber, and by first
Chamber is divided into the first servo piston 13 of the first left chamber 11 and the first right chamber 12；It is provided with and is used in first left chamber 11
The first spring 15 of the first servo piston 13 is pushed against, is provided with the first push rod 14 on the first servo piston 13；
Second servo unit 20 includes the second shell for being formed with second chamber, is arranged in second chamber, and by second
Chamber is divided into the second servo piston 23 of the second left chamber 21 and the second right chamber 22 and fixes with the second servo piston 23
Second push rod 24 of connection is respectively provided with second spring 25 in the second left chamber 21 and the second right chamber 22, and the second push rod 24 is used for
Swash plate 51 is driven, and: when the second push rod 24 moves to left, the gradient of swash plate 51 reduces, when the second push rod 24 moves to right, swash plate 51
Gradient increases；
Two control units 30 are arranged side by side and include the spool 31 for being formed with the valve body of valve chamber and being arranged in valve chamber,
First push rod 14 is simultaneously connect with two spools 31 simultaneously between spool 31, and system hydraulic oil passes through one of control list
Member 30 is to 21 fuel feeding of the second left chamber, by another control unit 30 to 22 fuel feeding of the second right chamber, so that:
When the first push rod 14 is moved to the left, the first push rod 14 drives two spools 31 mobile so as to be passed through the second right chamber simultaneously
The pressure of hydraulic oil in room 22 is greater than the pressure of the hydraulic oil in the second left chamber 21, at this point, the second push rod 24 is moved to the left,
So that the gradient of the swash plate 51 of plunger variable pump 50 reduces, so that the discharge capacity of plunger variable pump 50 be made to reduce；When the first push rod 14
When moving right, the first push rod 14 drives two spools 31 to move the pressure so that the hydraulic oil being passed through in the second right chamber 22 simultaneously
Less than the pressure of the hydraulic oil in the second left chamber 21, at this point, the second push rod 24 moves right, so that plunger variable pump 50 is oblique
The gradient of disk 51 increases, so that the discharge capacity of plunger variable pump 50 be made to increase.
Electrohydraulic controlling mechanism further includes fixed pressure reducing valve 40, and system hydraulic oil is divided into two-way and each leads into the first left chamber 11
With the first right chamber 12, fixed pressure reducing valve 40 is arranged on the pipeline for being passed through the first left chamber 11, so that in the first left chamber 11
The pressure of hydraulic oil keep constant so that the pressure of the hydraulic oil in the first right chamber 12 with it is hydraulic in the first left chamber 11
The difference of the pressure of oil increases with the increase of system pressure.
In this way, when system pressure increases (for some reason, discharge capacity including plunger variable pump 50 increase, control element
Hydraulic fluid port becomes smaller) when, the pressure of the hydraulic oil in the first right chamber 12 increases, and the pressure of the hydraulic oil in the first left chamber 11
It is constant because being controlled pressure by fixed pressure reducing valve 40, so that the first servo piston 13 is moved to the left, the first servo piston 13
Movement is so that the gradient of the swash plate 51 of plunger variable pump 50 reduces；To which the discharge capacity of plunger variable pump 50 reduces, plunger variable pump
50 discharge capacity offsets the system pressure of rising after reducing.When the first servo piston 13 moves right, the first servo piston 13 makes
The gradient for obtaining the swash plate 51 of plunger variable pump 50 increases；When system pressure reduces (for some reason, including plunger variable pump 50
Discharge capacity reduces, the hydraulic fluid port of control element becomes larger) when, the pressure of the hydraulic oil in the first right chamber 12 reduces, and the first left chamber
The pressure of hydraulic oil in room 11 is because constant by the control of fixed pressure reducing valve 40 pressure, so that the first servo piston 13 moves right
Dynamic, the movement of the first servo piston 13 is so that the gradient of the swash plate 51 of plunger variable pump 50 increases, thus plunger variable pump 50
Discharge capacity increases, and the discharge capacity of plunger variable pump 50 increases the system pressure of post-compensation decline.
Electrohydraulic controlling mechanism of the invention establishes the relationship between 50 discharge capacity of system pressure and plunger variable pump, so that being
The change for the discharge capacity that system pressure only passes through plunger variable pump 50 is adjusted, to eliminate other for adjusting and influencing system pressure
The process of Hydraulic Elements, to keep adjustment process simply and accurate.The process can simply accurate regulating system pressure the reason of
Be: although there are many factor for influencing system pressure, system pressure can be carried out by changing the discharge capacity of plunger variable pump 50
Change and adjusts.
Relationship between 50 discharge capacity of the system pressure that electrohydraulic controlling mechanism of the invention is established and plunger variable pump is to watch
Take relationship, that is to say, that system pressure can generate pressure signal in real time, and the pressure signal is direct or is converted into mechanical signal
Plunger variable pump 50 is passed to so that 50 discharge capacity of plunger variable pump changes, and the change of 50 discharge capacity of plunger variable pump being capable of real-time shadow
Acoustic system pressure, so that system pressure be made to reach a numerical value that is constant and meeting system requirements.
Electrohydraulic controlling mechanism of the invention changes the discharge capacity of plunger variable pump 50 according to system pressure, thus after making adjusting
System pressure be more in line with pre-provisioning request.
Electrohydraulic controlling mechanism of the invention can be according to the discharge capacity of system pressure pilot plunger variable pump 50, and establishes system
The key of pressure and the servo relationship of plunger variable pump 50 is: definite value is arranged on the system pipeline for leading to the first left chamber 11
Pressure reducing valve 40, the fixed pressure reducing valve 40 make the pressure of the hydraulic oil in the first left chamber 11 be less than system pressure and for not with being
System pressure change and the definite value that changes, and the pressure of the hydraulic oil in the first right chamber 12 is equal to system pressure, so that the
The pressure of hydraulic oil in one right chamber 12 and the pressure initiation of the hydraulic oil in the first left chamber 11 pressure difference, in pre- level pressure
Power is poor, and (predetermined pressure difference refers to: system pressure required for hydraulic system, i.e. rated pressure, in the first left chamber 11
The difference of the pressure of hydraulic oil) under, which is offset by the first spring 15, at this point, the first servo piston 13 is kept
It is motionless, and when system pressure is above or below rated pressure, at this point, the first servo piston 13 occurs under the action of pressure difference
It is mobile, change so that by the movement of the first servo piston 13 gradient occurs for swash plate 51, to change plunger variable pump
50 discharge capacity, and the change of this discharge capacity can make up for it just or the change of bucking-out system pressure, for example, when system pressure increases
When, the first servo piston 13 reduces 50 discharge capacity of plunger variable pump, and when the system pressure decreases, the first servo piston 13 makes
50 discharge capacity of plunger variable pump increases.
The fixed pressure reducing valve 40 of electrohydraulic controlling mechanism of the invention is the decisive element for generating pressure difference, and makes system pressure
Condition is exactly that 13 both ends of the first servo piston produce pressure difference under the decision of power and the generation servo relationship of plunger variable pump 50.
The fixed pressure reducing valve 40 of electrohydraulic controlling mechanism of the invention also determines the rated pressure of system, that is to say, that
Under the premise of the coefficient of elasticity of first spring 15 is certain, when fixed pressure reducing valve 40 sets predetermined value, system pressure is also determined that
, reason is: when fixed pressure reducing valve 40 sets predetermined value as A, at this point, it is A pairs that system pressure, which should be equal to predetermined value,
Hydraulic fluid pressure (pressure of the hydraulic oil in the first left chamber 11) the sum of the FA and the thrust FB of the first spring 15 answered, otherwise
One servo piston 13 can move.That is, system pressure can generate one after 40 setting value of fixed pressure reducing valve determines
With setting value corresponding pressure value, conversely, system pressure can be kept satisfactory by adjusting fixed pressure reducing valve 40 setting value
Pressure value.Therefore, the fixed pressure reducing valve 40 of electrohydraulic controlling mechanism of the invention is also equipped with the function of regulating system rated pressure.
Electrohydraulic controlling mechanism of the invention due to being provided with fixed pressure reducing valve 40, so as to accurate according to system pressure and
By the discharge capacity of adjustment plunger variable pump 50 repeatedly, to make the volume for being adjusted to require of system pressure fast and accurately
Constant-pressure improves the shelf life of overflow valve to alleviate the pressure that overflow valve maintains system pressure constant.
In a preferred embodiment of the invention, two control units 30 are proportional reversing valve, two proportional reversing valves
Oil outlet is connected to the second left chamber 21 and the second right chamber 22 respectively, and oil inlet is connected to system hydraulic oil, and when two spools
31 with 14 level of the first push rod when being moved to the left, and the oil outlet pressure being connected to the second left chamber 21 is less than and the second right chamber 22
The oil outlet pressure of connection；When two spools 31 move horizontally to the right with the first push rod 14, what is be connected to the second left chamber 21 goes out
Hydraulic fluid port pressure is greater than the oil outlet pressure being connected to the second right chamber 22.
Above embodiments are only exemplary embodiment of the present invention, are not used in the limitation present invention, protection scope of the present invention
It is defined by the claims.Those skilled in the art can within the spirit and scope of the present invention make respectively the present invention
Kind modification or equivalent replacement, this modification or equivalent replacement also should be regarded as being within the scope of the present invention.
Claims (2)
1. a kind of electrohydraulic controlling mechanism, special for adjusting the pressure of hydraulic system by the discharge capacity for changing plunger variable pump
Sign is, comprising:
First servo unit comprising be formed with the first shell of first chamber, be arranged in the first chamber, and will be described
First chamber is divided into the first servo piston of the first left chamber and the first right chamber；It is provided with and is used in first left chamber
The first spring of first servo piston is pushed against, is provided with the first push rod on first servo piston；
Second servo unit comprising be formed with the second shell of second chamber, be arranged in the second chamber, and will be described
Second chamber is divided into the second servo piston of the second left chamber and the second right chamber and fixes with second servo piston
Second push rod of connection, second spring is respectively provided in second left chamber and second right chamber, and second push rod is used
In the swash plate for driving the plunger variable pump, and: when second push rod moves to left, the gradient of the swash plate reduces, described
When second push rod moves to right, the gradient of the swash plate increases；
Two control units, two described control units are arranged side by side and include being formed with the valve body of valve chamber and being arranged in the valve
Intracavitary spool, first push rod is simultaneously connect with two spools simultaneously between the spool, and system hydraulic oil
By one of described control unit to second left chamber fuel feeding, by another described control unit to described second
Right chamber fuel feeding, so that:
When first push rod is moved to the left, first push rod drives two spools mobile simultaneously so as to be passed through described the
The pressure of the indoor hydraulic oil of two right chambers be greater than the indoor hydraulic oil of the second left chamber pressure, when first push rod to the right
When mobile, first push rod drives two spools mobile so as to be passed through the pressure of the indoor hydraulic oil of the second right chamber simultaneously
Power is less than the pressure of the indoor hydraulic oil of the second left chamber；
The electrohydraulic controlling mechanism further includes
Fixed pressure reducing valve, system hydraulic oil is divided into two-way and each leads into first left chamber and first right chamber, described
Fixed pressure reducing valve is arranged on the pipeline for being passed through first left chamber, so that the pressure of the indoor hydraulic oil of the first left chamber
It keeps constant, so that the pressure of the indoor hydraulic oil of the first right chamber and the pressure of the indoor hydraulic oil of the first left chamber
Difference increases with the increase of system pressure.
2. electrohydraulic controlling mechanism according to claim 1, which is characterized in that two described control units are ratio commutation
Valve, the oil outlet of two proportional reversing valves are connected to second left chamber and second right chamber respectively, oil inlet with
The connection of system hydraulic oil, and when two spools are moved to the left with the first push rod level, connect with second left chamber
Logical oil outlet pressure is less than the oil outlet pressure being connected to second right chamber；When two spools are with first push rod
When moving horizontally to the right, the oil outlet pressure being connected to second left chamber is fuel-displaced greater than being connected to second right chamber
Mouth pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611033967.5A CN106593969B (en) | 2016-11-22 | 2016-11-22 | Electrohydraulic controlling mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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