CN110513359A - Continuously variable transmission test bed and continuously variable transmission test method - Google Patents
Continuously variable transmission test bed and continuously variable transmission test method Download PDFInfo
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- CN110513359A CN110513359A CN201910890904.9A CN201910890904A CN110513359A CN 110513359 A CN110513359 A CN 110513359A CN 201910890904 A CN201910890904 A CN 201910890904A CN 110513359 A CN110513359 A CN 110513359A
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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
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/005—Fault detection or monitoring
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/027—Test-benches with force-applying means, e.g. loading of drive shafts along several directions
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- Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention provides a test bed of a continuously variable transmission and a test method of the continuously variable transmission, which relate to the technical field of continuously variable transmission tests, and the test bed of the continuously variable transmission provided by the invention comprises: the oil tank, the first oil pump, the pressure reducing valve, the first reversing valve, the first oil cylinder and the clutch test port; the first reversing valve is provided with a first valve port, a second valve port, a third valve port and a fourth valve port, the first oil cylinder is provided with a first hydraulic cavity communicated with the first valve port and a second hydraulic cavity communicated with the second valve port, an inlet of the first oil pump is communicated with the oil tank in a fluid mode, an outlet of the first oil pump is communicated with the fourth valve port in a fluid mode, a pressure reducing valve is arranged between the first oil pump and the fourth valve port to adjust the oil flow rate of the fourth valve port, and the third valve port is communicated with the clutch test port in a fluid mode; the test bed for the continuously variable transmission can reduce the difference between the test performance and the actual working performance of the continuously variable transmission in the prior art, particularly the difference between the dynamic performance of a tested hydraulic system.
Description
Technical field
The present invention relates to stepless transmission experimental technique field, more particularly, to a kind of stepless transmission testing stand and stepless
Transmission test method.
Background technique
The response characteristic of hydraulic control system largely decides the system performance of stepless transmission, comprising: liquid
Press system control precision, pressure response characteristic, the system vibration performance under specific frequency, temperature and performance change characteristic etc..
Thus the research and development of stepless transmission, manufacturing enterprise need to carry out test job for hydraulic system.Hydraulic pressure strength is determined by loading
When determining, however testing stepless transmission, since stepless transmission is in light condition, it usually needs be arranged in oil circuit
Damping hole, oil liquid can not generate the hydraulic raising in part via damping hole in time, and then realize and load to hydraulic system.But
It is true dynamic during being difficult to visual simulation transmission duty using the volume and mechanical characteristic of the high pressure chest of damping hole formation
Step response, and then cause the real work performance difference of experimental performance and speed changer larger, influence system dynamic response characteristic.
Summary of the invention
The purpose of the present invention is to provide a kind of stepless transmission testing stand and stepless transmission test methods, existing to reduce
There is the difference of stepless transmission experimental performance and real work performance in technology.
In a first aspect, stepless transmission testing stand provided by the invention, comprising: fuel tank, the first oil pump, pressure reducing valve, first
Reversal valve, the first oil cylinder and clutch testing mouth；First reversal valve be equipped with the first valve port, the second valve port, third valve port and
4th valve port, the working condition of first reversal valve include: state one, and first valve port and the third valve port fluid connect
Logical, second valve port and the 4th valve port are in fluid communication；State two, first valve port and the 4th valve port fluid connect
Logical, second valve port and the third valve port are in fluid communication；First oil cylinder has be connected to first valve port first
Hydraulic cavities and the second hydraulic cavities for being connected to second valve port；The import of first oil pump and the fuel tank are in fluid communication, institute
The outlet and the 4th valve port for stating the first oil pump are in fluid communication；The pressure reducing valve is arranged in first oil pump and the described 4th
Between valve port, to adjust the oil liquid pressure of the 4th valve port；The third valve port and the clutch testing mouth are in fluid communication.
With reference to first aspect, the present invention provides the first possible embodiments of first aspect, wherein the clutch
It includes: first interface and second interface that device, which tests mouth,；Second is equipped between the clutch testing mouth and the third valve port to change
To valve, second reversal valve connects for making the first interface and the second interface select one with the third valve port fluid
It is logical.
With reference to first aspect, the present invention provides second of possible embodiments of first aspect, wherein described stepless
Gearbox testrigs further include: system speed governing valve, hydraulic loads and fuel feeding test mouth；The fuel feeding test mouth and first oil
Pump is in fluid communication, and the hydraulic loads setting is tested between mouth and first oil pump in the fuel feeding, the hydraulic loads
Movable part is used to test between mouth and first oil pump in the fuel feeding and move under the driving of pressure difference.
The possible embodiment of second with reference to first aspect, the third the present invention provides first aspect are possible
Embodiment, wherein the fuel feeding test mouth includes: third interface and the 4th interface；The hydraulic loads include: the second oil cylinder
With third oil cylinder, second oil cylinder has first chamber and the second chamber that is connected to the third interface, the third oil cylinder
With third chamber and the 4th chamber for being connected to the 4th interface；The is equipped between the hydraulic loads and first oil pump
Three reversal valves, the third reversal valve connect for making the first chamber and the third chamber select one with first oil pump
It is logical.
The third possible embodiment with reference to first aspect, the 4th kind the present invention provides first aspect are possible
Embodiment, wherein the third reversal valve be equipped with the 5th valve port, the 6th valve port, the 7th valve port and the 8th valve port, the described 6th
Valve port and the first chamber are in fluid communication, the 5th valve port and the third chamber in fluid communication, the 7th valve port with
The communication of first oil pump, the 8th valve port and the fuel tank are in fluid communication；The work of the third reversal valve
It include: state one as state, the 5th valve port and the 7th valve port are in fluid communication, the 6th valve port and the 8th valve
Mouth is in fluid communication；State two, the 5th valve port and the 8th valve port are in fluid communication, the 6th valve port and the 7th valve
Mouth is in fluid communication.
The 4th kind of possible embodiment with reference to first aspect, the 5th kind the present invention provides first aspect are possible
Embodiment, wherein between the 7th valve port and first oil pump be equipped with the first speed governing valve, the 8th valve port with it is described
The second speed governing valve is equipped between fuel tank.
With reference to first aspect, the present invention provides the 6th kind of possible embodiments of first aspect, wherein described stepless
Gearbox testrigs further include: the second oil pump and the 5th interface, the import of second oil pump and the fuel tank are in fluid communication, institute
The outlet and the 5th interface for stating the second oil pump are in fluid communication.
With reference to first aspect, the present invention provides the 7th kind of possible embodiments of first aspect, wherein described stepless
Gearbox testrigs further include: the 4th oil cylinder, the 6th interface and the 7th interface, the 4th oil cylinder are equipped with connection the described 6th and connect
5th chamber of mouth, and the 6th chamber of connection the 7th interface.
With reference to first aspect, the present invention provides the 8th kind of possible embodiments of first aspect, wherein described first
Safety valve is equipped between oil pump and the pressure reducing valve.
Second aspect, stepless transmission test method provided by the invention, comprising the following steps: adjust the first reversal valve with
Change the charge and discharge oil condition of the first hydraulic cavities and the charge and discharge oil condition of the second hydraulic cavities；Pressure reducing valve is adjusted to change in the first oil cylinder
The mobile suffered flowed friction of piston.
The embodiment of the present invention brings following the utility model has the advantages that being equipped with the first valve port, the second valve port, the using the first reversal valve
Three valve ports and the 4th valve port, the first oil cylinder have the first hydraulic cavities of the first valve port of connection be connected to the second valve port it is second hydraulic
Chamber, the import of the first oil pump and fuel tank are in fluid communication, and the outlet of the first oil pump and the 4th valve port are in fluid communication, and pressure reducing valve setting exists
Between first oil pump and the 4th valve port, to adjust the oil pressure of the oil liquid of the 4th valve port, third valve port and clutch testing mouth fluid
Connection, also, the working condition of the first reversal valve includes: state one, and the first valve port and third valve port are in fluid communication, the second valve port
It is in fluid communication with the 4th valve port；State two, the first valve port and the 4th valve port are in fluid communication, and the second valve port and third valve port fluid connect
Logical mode；Clutch testing mouth changes the first hydraulic cavities and second for connecting tested hydraulic system, by the first reversal valve
Hydraulic cavities internal pressure, and then the mobile quasi- clutch combination of inner piston and the isolated course of work are stretched by the first oil cylinder；Pass through
The oil liquid pressure of the 4th valve port of valve regulation is depressurized, and then adjusts the moving resistance of the first oil cylinder inner piston, by the first oil cylinder
Resistance in resistance simulation clutch cohesive process suffered by piston, thus the combination of simulated clutch or the speed in separation process
The dynamic characteristics such as degree, resistance and buffering, the oil-filled step response characteristic of clutch when can be run with approximate simulation stepless transmission,
And then the difference of stepless transmission experimental performance and real work performance is reduced, be conducive to improve the accurate of stepless transmission test
Property and authenticity.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate
Appended attached drawing, is described in detail below.
Detailed description of the invention
Technical solution in order to illustrate more clearly of the specific embodiment of the invention or in the related technology, below will be to specific
Attached drawing needed in embodiment or description of Related Art is briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the schematic diagram of stepless transmission testing stand provided in an embodiment of the present invention.
Icon: 1`- is tested hydraulic system；100- fuel tank；The first oil pump of 200-；300- pressure reducing valve；The first reversal valve of 400-；
The first valve port of 401-；The second valve port of 402-；403- third valve port；The 4th valve port of 404-；The first oil cylinder of 500-；501- first is hydraulic
Chamber；The second hydraulic cavities of 502-；600- clutch testing mouth；601- first interface；602- second interface；The second reversal valve of 700-；
800- system speed governing valve；900- hydraulic loads；The second oil cylinder of 901-；902- third oil cylinder；110- fuel feeding tests mouth；111- third
Interface；The 4th interface of 112-；120- third reversal valve；The 5th valve port of 121-；The 6th valve port of 122-；The 7th valve port of 123-；124-
8th valve port；The first speed governing valve of 130-；The second speed governing valve of 140-；The second oil pump of 150-；The 5th interface of 160-；The 4th oil of 170-
Cylinder；The 6th interface of 180-；The 7th interface of 190-；210- safety valve；The 8th interface of 220-；230- flowmeter.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Embodiment one
As shown in Figure 1, stepless transmission testing stand provided in an embodiment of the present invention, comprising: fuel tank 100, the first oil pump
200, pressure reducing valve 300, the first reversal valve 400, the first oil cylinder 500 and clutch testing mouth 600；First reversal valve 400 is equipped with the
One valve port 401, the second valve port 402, third valve port 403 and the 4th valve port 404, the working condition of the first reversal valve 400 includes: shape
State one, the first valve port 401 are in fluid communication with third valve port 403, and the second valve port 402 and the 4th valve port 404 are in fluid communication；State
Two, the first valve port 401 and the 4th valve port 404 are in fluid communication, and the second valve port 402 is in fluid communication with third valve port 403；First commutation
Valve 400 is configured for the first valve port 401 is made to select one correspondingly with the second valve port 402 being connected to third valve port 403 and the 4th
Valve port 404；First oil cylinder 500 have connection the first valve port 401 the first hydraulic cavities 501 be connected to the second of the second valve port 402
Hydraulic cavities 502；The import of first oil pump 200 and fuel tank 100 are in fluid communication, and the outlet of the first oil pump 200 and the 4th valve port 404 flow
Body connection；Pressure reducing valve 300 is arranged between the first oil pump 200 and the 4th valve port 404, to adjust the oil liquid pressure of the 4th valve port 404
Power；Third valve port 403 and clutch testing mouth 600 are in fluid communication.
Specifically, first piston is set in the first oil cylinder 500, the inner cavity of the first oil cylinder 500 is separated to form by first piston
One hydraulic cavities 501 and the second hydraulic cavities 502；First reversal valve 400 uses three position four-way directional control valve, when the first reversal valve 400
Working condition be state for the moment, be tested in hydraulic system 1` oil liquid through clutch testing mouth 600 and the first reversal valve 400 injection the
One hydraulic cavities 501 adjust the pressure of 502 inner fluid of the second hydraulic cavities by pressure reducing valve 300, to adjust in the first oil cylinder 500
The movement speed of piston, and then pass through the combination speed in 500 simulated clutch cohesive process of the first oil cylinder, ease up in conjunction with resistance
Rush characteristic；When the working condition of the first reversal valve 400 is state two, oil liquid is through clutch testing mouth in tested hydraulic system 1`
600 and first reversal valve 400 inject the second hydraulic cavities 502, pass through pressure reducing valve 300 adjust 501 inner fluid of the first hydraulic cavities pressure
By force, thus adjust 500 inner piston of the first oil cylinder movement speed, and then by 500 simulated clutch separating rate of the first oil cylinder,
Resistance and damping characteristics are separated, and then pass through the combination of approximate simulation clutch or speed, resistance and buffering in separation process
Etc. dynamic characteristics, the difference of stepless transmission experimental performance Yu real work performance can be reduced, to improve stepless transmission
The accuracy of test.
In embodiments of the present invention, clutch testing mouth 600 includes: first interface 601 and second interface 602；Clutch
It tests and is equipped with the second reversal valve 700 between mouth 600 and third valve port 403, the second reversal valve 700 is for making 601 He of first interface
Second interface 602 is selected one and is in fluid communication with third valve port 403.Wherein, first interface 601 is configured to forward gear clutch interface,
Second interface 602 is configured to reverse clutch interface, and the second reversal valve 700 is configured to three position four-way directional control valve, the second reversal valve
First interface 601 and second interface 602 can be selected one by 700 is connected to third valve port 403, switches work by the first reversal valve 400
Make state, and then can simulate and work in conjunction with the forward gear clutch work in separation process with reverse clutch.
Further, stepless transmission testing stand further include: system speed governing valve 800, hydraulic loads 900 and fuel feeding test mouth
110；The setting of hydraulic loads 900 is tested between mouth 110 and the first oil pump 200 in fuel feeding, and the movable part of hydraulic loads 900 is used for
It tests between mouth 110 and the first oil pump 200 in fuel feeding and is moved under the driving of pressure difference.Wherein, fuel feeding test mouth 110 is for connecting
Tested hydraulic system 1` drives oil liquid flowing by the first oil pump 200, and adjusts oil liquid flowing velocity by system speed governing valve 800,
And then change the movement velocity of the movable part of hydraulic loads 900, so as to simulate stepless transmission transmission ratio change procedure
In tested hydraulic system 1` operating duty.Wherein, hydraulic cylinder or hydraulic motor can be used in hydraulic loads 900, passes through
Pressure difference can be axially moved or be driven hydraulic with driving hydraulic cylinder inner piston between fuel feeding test mouth 110 and the first oil pump 200
The rotation of motor internal rotor.
It should be noted that setting the first cone pulley and the second cone pulley in stepless transmission, pass through flexible the first cone of driving of oil cylinder
Distance change between wheel and the second cone pulley, and then can change the transmission ratio of the first cone pulley and the carried steel band of the second cone pulley, it adopts
The load in stepless transmission speed ratio change procedure is simulated with the oil cylinder of the first cone pulley of driving and the second cone pulley, so as to image
Simulate the working condition of stepless transmission.
Such as: it includes third interface 111 and the 4th interface 112 that fuel feeding, which tests mouth 110, and hydraulic loads 900 include the second oil
Cylinder 901 and third oil cylinder 902, the second oil cylinder 901 have first chamber and the second chamber that is connected to third interface 111, and third is oily
Cylinder 902 has third chamber and the 4th chamber that is connected to the 4th interface 112；It is equipped between hydraulic loads 900 and the first oil pump 200
Third reversal valve 120, third reversal valve 120 are connected to for making first chamber and third chamber select one with the first oil pump 200.When
When one chamber is connected to the first oil pump 200, the first oil pump 200 driving oil liquid flows through third reversal valve 120 and injects first chamber, into
And drive 901 inner piston of the second oil cylinder mobile；When third chamber is connected to the first oil pump 200, the first oil pump 200 drives oil liquid
It flows through third reversal valve 120 and injects third chamber, and then drive 902 inner piston of third oil cylinder mobile.
Further, third reversal valve 120 is equipped with the 5th valve port 121, the 6th valve port 122, the 7th valve port 123 and the 8th valve
Mouth 124, the 6th valve port 122 are in fluid communication with first chamber, the 5th valve port 121 and third chamber in fluid communication, the 7th valve port 123
With the communication of the first oil pump 200, the 8th valve port 124 is in fluid communication with fuel tank 100；The work of third reversal valve 120
State includes: state one, and the 5th valve port 121 and the 7th valve port 123 are in fluid communication, the 6th valve port 122 and 124 fluid of the 8th valve port
Connection；State two, the 5th valve port 121 and the 8th valve port 124 are in fluid communication, and the 6th valve port 122 and 123 fluid of the 7th valve port connect
It is logical.Specifically, the working condition of third reversal valve 120 is in state for the moment, the first oil pump 200 driving oil liquid flows through third commutation
Valve 120 injects third chamber, and then drives 902 inner piston of third oil cylinder mobile, and tested hydraulic system 1` inner fluid connects through third
Mouth 111 flows into second chambers, and first chamber inner fluid flows into fuel tank 100 through the 6th valve port 122 and the 8th valve port 124；Work as third
When the working condition of reversal valve 120 is in state two, the first oil pump 200 driving oil liquid flows through the injection of third reversal valve 120 first
Chamber, and then drive 901 inner piston of the second oil cylinder mobile, hydraulic system 1` inner fluid, which is tested, through the 4th interface 112 flows into the 4th
Chamber, 902 inner piston of third oil cylinder is mobile, and third chamber inner fluid flows through the 5th valve port 121 and the 8th valve port 124 flows into fuel tank
100.Second oil cylinder, 901 inner piston is mobile and 902 inner piston of third oil cylinder is mobile by drag effect, passes through system speed governing valve
800 adjust oil flow, and then simulate the change of the hydraulic load and hydraulic cylinder volume in stepless transmission speed ratio change procedure
Rate.
As shown in Figure 1, be equipped with the first speed governing valve 130 between the 7th valve port 123 and the first oil pump 200, the 8th valve port 124 with
The second speed governing valve 140 is equipped between fuel tank 100.Wherein, the oil flow of the 7th valve port 123 is adjusted in the first speed governing valve 130, the
Two speed governing valves 140 are adjusted the oil flow of the 8th valve port 124, and then adjustable second oil cylinder 901 and third oil cylinder 902
Volume rate of change, so as to the rate of analog regulation speed ratio variation.
Further, stepless transmission testing stand further include: the second oil pump 150 and the 5th interface 160, the second oil pump 150
Import and fuel tank 100 be in fluid communication, the outlet of the second oil pump 150 and the 5th interface 160 are in fluid communication.Second oil pump 150 is used
In 100 inner fluid of fuel tank is delivered to the 5th interface 160, the 5th interface 160 passes through second for being connected to tested hydraulic system 1`
Oil pressure needed for oil pump 150 provides work to tested hydraulic system 1`, and then in test without being outside tested hydraulic system 1`
Connect oil feed line.
Further, stepless transmission testing stand further include: the 4th oil cylinder 170, the 6th interface 180 and the 7th interface 190,
4th oil cylinder 170 is equipped with the 5th chamber of the 6th interface 180 of connection, and the 6th chamber of the 7th interface 190 of connection.4th oil
The 4th piston is set in cylinder 170, the inner cavity of the 4th oil cylinder 170 is separated to form the 5th chamber and the 6th chamber by the 4th piston, when
When the pressure of six interfaces 180 and the 7th interface 190 is equal, 170 inner piston without motion of the 4th oil cylinder；When the 6th interface 180 and
When seven interfaces 190 generate pressure difference, the 4th piston motion in the 4th oil cylinder 170.6th interface 180 and the 7th interface 190 are distinguished
For being connected to the two sides of fluid torque-converter, when the 4th piston of the 4th oil cylinder 170 is in middle of stroke, that is, unlock.
Further, safety valve 210 is equipped between the first oil pump 200 and pressure reducing valve 300.Wherein, first speed governing valve 130
Import and pressure reducing valve 300 are in fluid communication with safety valve 210 respectively, when the outlet end oil pressure of the first oil pump 200 is greater than pressure reducing valve 300
Preset value when, the oil liquid part in the exit of the first oil pump 200 is flowed out by safety valve 210, to avoid oil liquid in pipeline
Pressure is excessive；The outlet of safety valve 210 and fuel tank 100 are in fluid communication, so that the oil liquid flowed out by safety valve 210 be made to flow back to oil
In case 100.
Further, stepless transmission testing stand further includes the 8th interface 220 and flowmeter 230, and the 8th interface 220 is used for
Tested hydraulic system 1` is connected, flowmeter 230 is connected between the 8th interface 220 and fuel tank 100, is tested inside hydraulic system 1`
Oil liquid flows through the 8th interface 220 and flowmeter 230 is expelled in fuel tank 100, oil liquid flow during flowmeter 230 is detectable.
Embodiment two
Stepless transmission test method provided in an embodiment of the present invention, comprising the following steps: adjust the first reversal valve 400 with
Change the filling of the filling of the first hydraulic cavities 501, state of draining the oil and the second hydraulic cavities 502, state of draining the oil；Pressure reducing valve 300 is adjusted to change
Become flowed friction suffered by 500 inner piston of the first oil cylinder.Wherein, pass through the mobile analog clutch of 500 inner piston of the first oil cylinder
In conjunction with and separation process, change the mobile suffered flowed friction of 500 inner piston of the first oil cylinder by adjusting pressure reducing valve 300, thus
The combination and separation of clutch under different conditions can be simulated.
Further, the working condition of third reversal valve 120 is adjusted to state one, and the first oil pump 200 driving oil liquid flows through
Third reversal valve 120 injects third chamber, and then drives the movement of 902 inner piston of third oil cylinder, and increase third cavity volume,
Tested hydraulic system 1` inner fluid flows into second chamber through third interface 111, and first chamber inner fluid is through the 6th valve port 122 and the
Eight valve ports 124 flow into fuel tank 100；The working condition of third reversal valve 120 is adjusted to state two, the first oil pump 200 drives oil liquid
It flows through third reversal valve 120 and injects first chamber, and then drive the movement of 901 inner piston of the second oil cylinder, and make first chamber volume
Increase, is tested hydraulic system 1` inner fluid through the 4th interface 112 and flows into the 4th chamber, the third cavity volume of third oil cylinder 902
It reduces, third chamber inner fluid flows through the 5th valve port 121 and the 8th valve port 124 flows into fuel tank 100.First chamber and third chamber
Volume variation generates resistance, to simulate the hydraulic load in stepless transmission speed ratio change procedure, first chamber, the in the process
The volume dynamic change of two chambers, third chamber and the 4th chamber, so as to more vivid simulation stepless transmission work
True dynamic characteristic in the process.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of stepless transmission testing stand characterized by comprising fuel tank (100), the first oil pump (200), pressure reducing valve
(300), the first reversal valve (400), the first oil cylinder (500) and clutch testing mouth (600)；
First reversal valve (400) is equipped with the first valve port (401), the second valve port (402), third valve port (403) and the 4th valve
Mouth (404)；
First oil cylinder (500) have the first hydraulic cavities (501) for being connected to first valve port (401) be connected to described second
The second hydraulic cavities (502) of valve port (402)；
The import of first oil pump (200) and the fuel tank (100) are in fluid communication, the outlet of first oil pump (200) with
4th valve port (404) is in fluid communication；
The pressure reducing valve (300) is arranged between first oil pump (200) and the 4th valve port (404), described in adjusting
The oil liquid pressure of 4th valve port (404)；
First reversal valve (400) is configured for keeping first valve port (401) and second valve port (402) one a pair of
Select the connection third valve port (403) and the 4th valve port (404) with answering；
The third valve port (403) and the clutch testing mouth (600) are in fluid communication.
2. stepless transmission testing stand according to claim 1, which is characterized in that clutch testing mouth (600) packet
It includes: first interface (601) and second interface (602)；
The second reversal valve (700) are equipped between the clutch testing mouth (600) and the third valve port (403), described second
Reversal valve (700) is for making the first interface (601) and the second interface (602) select one and the third valve port (403)
It is in fluid communication.
3. stepless transmission testing stand according to claim 1, which is characterized in that the stepless transmission testing stand also wraps
It includes: system speed governing valve (800), hydraulic loads (900) and fuel feeding test mouth (110)；
Hydraulic loads (900) setting is between fuel feeding test mouth (110) and first oil pump (200), the liquid
The movable part that power loads (900) is used for the pressure difference between fuel feeding test mouth (110) and first oil pump (200)
The lower movement of driving.
4. stepless transmission testing stand according to claim 3, which is characterized in that the fuel feeding tests mouth (110) and includes:
Third interface (111) and the 4th interface (112)；
The hydraulic loads (900) include: the second oil cylinder (901) and third oil cylinder (902), and second oil cylinder (901) has
First chamber and the second chamber for being connected to the third interface (111), the third oil cylinder (902) have third chamber be connected to
4th chamber of the 4th interface (112)；
Third reversal valve (120) are equipped between the hydraulic loads (900) and first oil pump (200), the third commutation
Valve (120) is connected to for making the first chamber and the third chamber select one with first oil pump (200).
5. stepless transmission testing stand according to claim 4, which is characterized in that the third reversal valve (120) is equipped with
5th valve port (121), the 6th valve port (122), the 7th valve port (123) and the 8th valve port (124), the 6th valve port (122) with
The first chamber is in fluid communication, the 5th valve port (121) and the third chamber in fluid communication, the 7th valve port
(123) connect with the communication of first oil pump (200), the 8th valve port (124) and the fuel tank (100) fluid
It is logical；
The working condition of the third reversal valve (120) includes:
State one, the 5th valve port (121) and the 7th valve port (123) are in fluid communication, the 6th valve port (122) and institute
State the 8th valve port (124) fluid communication；
State two, the 5th valve port (121) and the 8th valve port (124) are in fluid communication, the 6th valve port (122) and institute
State the 7th valve port (123) fluid communication.
6. stepless transmission testing stand according to claim 5, which is characterized in that the 7th valve port (123) with it is described
The first speed governing valve (130) are equipped between first oil pump (200), are equipped between the 8th valve port (124) and the fuel tank (100)
Second speed governing valve (140).
7. stepless transmission testing stand according to claim 1, which is characterized in that the stepless transmission testing stand also wraps
Include: the second oil pump (150) and the 5th interface (160), the import of second oil pump (150) and the fuel tank (100) fluid connect
Logical, the outlet of second oil pump (150) and the 5th interface (160) are in fluid communication.
8. stepless transmission testing stand according to claim 1, which is characterized in that the stepless transmission testing stand also wraps
Include: the 4th oil cylinder (170), the 6th interface (180) and the 7th interface (190), the 4th oil cylinder (170), which is equipped with, is connected to described the
5th chamber of six interfaces (180), and the 6th chamber of connection the 7th interface (190).
9. stepless transmission testing stand according to claim 1, which is characterized in that first oil pump (200) with it is described
Safety valve (210) are equipped between pressure reducing valve (300).
10. a kind of stepless transmission test method, which comprises the following steps:
The first reversal valve (400) is adjusted to change the charge and discharge oil condition of the first hydraulic cavities (501) and filling for the second hydraulic cavities (502)
It drains the oil state；
Pressure reducing valve (300) are adjusted to change the mobile suffered flowed friction of the first oil cylinder (500) inner piston.
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| CN110513359B (en) | 2021-03-19 |
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Effective date of registration: 20220517 Address after: 410221 Room 301, building F1, Lugu Yuyuan, No. 27, Wenxuan Road, high tech Development Zone, Changsha, Hunan Patentee after: HUNAN KINGRAIN ELECTRO-HYDRAULIC SYSTEM Co.,Ltd. Address before: 411100, No.2, Shitou, Yuhu District, Xiangtan City, Hunan Province Patentee before: HUNAN University OF SCIENCE AND TECHNOLOGY |