CN102510999B - Air pressure circuit of tire testing device, tire testing device, and tire testing method - Google Patents
Air pressure circuit of tire testing device, tire testing device, and tire testing method Download PDFInfo
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- CN102510999B CN102510999B CN201080042253.5A CN201080042253A CN102510999B CN 102510999 B CN102510999 B CN 102510999B CN 201080042253 A CN201080042253 A CN 201080042253A CN 102510999 B CN102510999 B CN 102510999B
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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
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
- G01M17/02—Tyres
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Abstract
Disclosed is a tire testing device capable of suppressing variations in air pressure occurring during tire testing by adjusting the temperature of air supplied to a tire. Specifically disclosed is an air pressure circuit (1) of a tire testing device (2), which comprises an air supply source (10) that supplies air to a tire (T) mounted between a pair of rims (6, 7) and a pressure adjusting valve (13) that adjusts the pressure of the air supplied from the air supply source (10) to the tire (T) to a bead air pressure for expanding the tire (T) so that the tire (T) can be mounted on the rims (6, 7) or to a test air pressure that is lower than the bead air pressure and that is used during tire testing. The air pressure circuit (1) of the tire testing device (2) also comprises an air temperature adjusting mechanism (21) that can cool the air supplied to the tire (T) at the bead air pressure such that the temperature thereof is reduced to a temperature lower than that of the outside air.
Description
Technical field
The present invention relates to a kind of pneumatic circuit, the tyre testing apparatus possessing this pneumatic circuit that use in the tyre testing apparatus of tyre evenness machine etc. and use this pneumatic circuit to carry out the tire testing method of tire test.
Background technology
Existing, for the tire completed with product form, carry out detecting homogeneity (uniformiy) etc., determining whether qualified tire test (Homogeneity).To such as passenger car by tire checking homogeneity time, tire test uses general test unit as Patent Document 1 to carry out according to following flow process.
The tyre testing apparatus of patent documentation 1, possesses the pneumatic circuit carrying out compression adjustment to the pressurized air supplied from factory air source, supply to the tire be bearing on wheel rim, makes the laggard row tire test of tire inflation.This pneumatic circuit possesses the pipe arrangement of 2 systems of branched halfway.One is making the tire short time expand while, tire is arranged on the pipe arrangement of the bcad seats system on wheel rim, the pipe arrangement of the test macro used when another is tire test.Use transfer valve, the pipe arrangement of bcad seats system and the pipe arrangement of test macro are switched, thus pneumatic circuit can utilize the pipe arrangement path of 2 systems to make tire inflation.
When utilizing this tyre testing apparatus to carry out tire test, the wheel rim split up and down is first utilized to sandwich from checking the tire that the upstream of line transports.Next, use the pipe arrangement of bcad seats system, the tire short time is expanded.Now, the compressed-air actuated air pressure using the pipe arrangement of bcad seats system to supply to tire is generally high pressure (such as, about 400kPa) compared with the test pressure (measuring air pressure) during tire test.Comprise pressure rise time tire kept for 1 second about above-mentioned bcad seats pressure.
Next, in this tyre testing apparatus, utilize transfer valve, compressed-air actuated stream switches to the pipe arrangement of test macro from the pipe arrangement of bcad seats system.Arranging pressure-regulating valve in the midway of the pipe arrangement of this test macro, can be test pressure (such as, about 200kPa) by the decompression of the pressurized air of high pressure.Thus, by the pipe arrangement supply pressurized air of test macro, thus the air pressure in tire is adjusted to test pressure.Then, cylinder is pressed on the tire of maintenance test pressure, utilizes the load measure device be arranged on cylinder, measure the reacting force that tire produces, thus, the homogeneity of detection tire.
Further, as above-mentioned pressure-regulating valve, as shown in patent documentation 2, also sometimes use the pressure governor of servo-type.
At first technical literature
Patent documentation
Patent documentation 1: Japan JP 6-95057 publication
Patent documentation 2: United States Patent (USP) No. 5291776 instructions
On the other hand, known in tire test, if the air pressure in test in tire slightly changes, then the measurement result of homogeneity has very large variation.Thus, in order to make that market does not occur substandard product, or mistakenly specification product can not be judged to be substandard product, importantly the air pressure in tire be remained on consistently test pressure.But in the tire test of reality, sometimes in test or air pressure reduce, or to rise occasionally.
Air pressure change in this tire is existing little time about 0.5kPa, also has greatly to when about 1kPa., though the change of air pressure little to about 0.5kPa time, the air pressure change in tire also can affect greatly the measurement result of homogeneity.In the Homogeneity measuring the tire reacting force change that tyre revolution 1 is enclosed, the variation characteristic of the reacting force utilizing tire self to have adds that the value of the reacting force change gained produced along with the air pressure change occurred at tire is measured.Thus, in same tire, along with the difference on the opportunity of measurement, the phase relation of the overlap of variation characteristic is changed, thus the measurement result of each test is different, likely cannot the repetition stability of reliably identification test device.Consequently, be likely difficult to realize test unit, the quality of test wire guarantees.
But the general pressure-regulating valve used in the tyre testing apparatus as patent documentation 1, is difficult to regulate small air pressure change as above.Reason is, in general pressure-regulating valve, pressure regulation spectrum is about 1000kPa, pressure degree of regulation preferably ± 0.1%, namely about 1kPa.Thus use and only have the pressure-regulating valve of about 1kPa pressure degree of regulation, the air pressure in the tire that can not change about 0.5kPa in tire test regulates.
On the other hand, the pressure-regulating valve of servo-type is disclosed in patent documentation 2.The pressure-regulating valve of this servo-type, pressure degree of regulation is excellent, but response is low, and price is also high.Thus, namely the pressure-regulating valve of this servo-type allows to tackle mild and steady barometric fluctuation, does not also have the response that in time can regulate tire internal gas pressure in the tire test time about only having for 1 second.In addition, if use the component of high price as servo-type pressure-regulating valve, then also there is the problem of tyre testing apparatus selling at exorbitant prices.Thus, as patent documentation 2, in the tyre testing apparatus adopting servo-type pressure-regulating valve to tire test in air pressure in the tire that changes to regulate and unrealistic.
Summary of the invention
The present invention produces in view of the above problems, its object is to the pneumatic circuit providing a kind of tyre testing apparatus, by regulating the temperature of the air to tire supply, thus, the barometric fluctuation produced in tire test can be suppressed.
In addition, the present invention also aims to, provide a kind of can low cost and detect tyre testing apparatus and the tire testing method of homogeneity accurately.
In order to realize described object, the present invention adopts following technological means.
Namely, the pneumatic circuit of tyre testing apparatus of the present invention, possess to the air fed air supply source of the tire be arranged between a pair wheel rim, it is characterized in that, the pneumatic circuit of described tyre testing apparatus possesses air temperature modification mechanism, and the temperature of the air supplied to described tire from described air supply source can be adjusted to set point of temperature by this air temperature modification mechanism.
This air temperature modification mechanism specifically can adopt in following pneumatic circuit.
This pneumatic circuit possesses pressure-regulating valve, the pressure of air that this pressure-regulating valve will supply from described air supply source to tire, be adjusted to the tyre bead air pressure that is arranged between described wheel rim for making described tire inflation or the measuring air pressure used when tire test lower than described tyre bead air pressure, the temperature of the air supplied to described tire with described tyre bead air pressure can be cooled to the temperature lower than external air temperature by described air temperature modification mechanism.
According to the research of present inventor, one of reason that in tire test, pressure reduces is, by the impact that air themperature in tire reduces.
When the pressurized air of normal temperature flows into tire with tyre bead air pressure, the air be originally present in tire is compressed, and make temperature increase due to adiabatic compression, the air in tire becomes high temperature.Thereafter, when transferring to measuring air pressure from tyre bead air pressure, tyre inner pressure sharply declines, and due to adiabatic expansion, in tire, the temperature of air declines., because original temperature rise is large, thus in tire, the finishing temperature of air is generally higher than the tire of normal temperature or the temperature of wheel rim.Consequently, the atmospheric heat in tire test in tire is to tire or wheel rim transmission, and the air themperature of inside tires reduces.
Such as, suppose to enclose 0.05m in tire or pipe arrangement
3the pressurized air of 200kPa time, within Measuring Time 1 second, its air themperature declines 1 DEG C to 24 DEG C from 25 DEG C.
At this, if think almost do not have volume change, then according to boyle-Charles law (the long-pending value divided by absolute temperature of pressure and volume is certain), pressure reduces 200kPa × 1K/297K=0.7kPa.In addition, air themperature when transferring to measuring air pressure in tire is higher compared with wheel rim or tyre temperature (external air temperature), and the temperature variation in Measuring Time more increases, and the variable quantity of pressure more increases.
Thus, by cooling the pressure-air of initial bcad seats system in advance, thus, if temperature reductions when the nearly measuring air pressure of the differential of temperature during tyre bead air pressure and external air temperature shifts, then the air themperature of measuring air pressure can be made to be positioned near external air temperature.
Thus, eliminate the air temperature variations in tire in Measuring Time, the barometric fluctuation produced in tire test can be suppressed.
In addition, described air temperature modification mechanism can have the heat exchanger of air can preserved from the container of the air of described air supply source and the described container of cooling.
Container and heat exchanger are set like this, thus, large quantity of air can be stored in advance in container, the air in container can be cooled by heat exchanger in advance.That is, a large amount of cooling-airs moment can be sent into tire with high pressure, tire sharply be expanded, the assembly properties (adaptation) of tyre and rim can be improved.
Further, described air temperature modification mechanism can have can with the storage of the state of the high pressure higher than described tyre bead air pressure from the container of the air of described air supply source with carrying out the exhaust unit of adiabatic expansion with described tyre bead air pressure to being discharged to the outside by the air in described container before tire air supply.
Like this owing to being provided with container and exhaust unit, thus, easily can keep the air than tyre bead air pressure high pressure in container, and before tire air supply, this air can be discharged with exhaust unit, pressure is reduced to tyre bead air pressure.Thus, the principle of adiabatic expansion can be utilized quickly the temperature of the whole air in container to be cooled, need not the special entities such as heat exchanger be adopted, just can obtain a large amount of cooled air with easy structure.
Further, according to the tyre testing apparatus possessing above-mentioned pneumatic circuit, by regulating the air themperature to tire supply, thus, the barometric fluctuation produced in tire test can be suppressed, the homogeneity of tire can be measured accurately.
Tire testing method of the present invention, measures the characteristic of described tire, it is characterized in that, the temperature of the air supplied to described tire is adjusted to set point of temperature under the state supplying to the tire be arranged between a pair wheel rim to give air.
In addition, tire testing method of the present invention, can comprise: by being supplied to tire by the air being adjusted to tyre bead air pressure, makes described tire inflation and the operation be arranged between a pair wheel rim; The operation of the characteristic of described tire is measured under the state supplying the air of the measuring air pressure giving the pressure be adjusted to lower than described tyre bead air pressure to the described tire be arranged between described wheel rim, the feature of described tire testing method is, the temperature of the air supplied to tire with described tyre bead air pressure is cooled to the temperature lower than external air temperature.
Like this, if be set point of temperature or the temperature lower than external air temperature by the air temperature modification supplied from air supply source to tire, then can suppress the barometric fluctuation that cannot regulate with pressure-regulating valve, the homogeneity of tire can be measured accurately.
Invention effect
According to the pneumatic circuit of tyre testing apparatus of the present invention, by regulating the air themperature to tire supply, thus the barometric fluctuation that produces in tire test can be suppressed.In addition, according to tyre testing apparatus of the present invention and tire testing method, the barometric fluctuation produced in tire test can be suppressed, can test tire accurately.
Accompanying drawing explanation
Fig. 1 is the front view of tyre testing apparatus of the present invention.
Fig. 2 is the figure of the basic comprising of the pneumatic circuit represented in tyre testing apparatus of the present invention.
Fig. 3 is the figure of the pneumatic circuit representing the 1st embodiment.
Fig. 4 is the figure of the pneumatic circuit representing the 2nd embodiment.
Embodiment
[the 1st embodiment]
With reference to the accompanying drawings the pneumatic circuit 1 of the 1st embodiment and the tyre testing apparatus 2 that is provided with this pneumatic circuit 1 are described.
Tyre testing apparatus 2 of the present invention carries out the product examinations such as uniformity test to the tire T completed with product form.In present embodiment, adopt homogeneity machine as tyre testing apparatus 2.This tyre testing apparatus 2 has such as formation as shown in Figure 1.
As shown in Fig. 1 model utility, tyre testing apparatus 2 comprise tower-likely be arranged on ground frame 3, be arranged on 1 group of tire axle up and down in this frame 34,5, be arranged on the wheel rim 6,7 of fixed tire T on these tire axles 4,5.These tire axles 4,5 are rotatably equipped with around upper lower shaft.Further, in the side of the tire T fixed with wheel rim 6,7, the cylinder (omitting diagram) that outer peripheral face forms simulated roadway is set.The formation of this cylinder can drive around upper lower shaft to rotate, and in addition, can also move horizontally, simulated roadway is contacted with tire T.
In explanation afterwards, using upper and lower up and down as tyre testing apparatus 2 of Fig. 1 paper.
The tire axle 4,5 of tyre testing apparatus 2, comprise be arranged on upper tire axle 4 on the upside of frame 3 and with this on tire axle 4 is coaxial is equipped with and is lifting freely arranged on the lower tire axle 5 of below separated by a distance.Wheel rim 6 is set in the lower end of upper tire axle 4, in addition, lower wheel rim 7 is set in the upper end of lower tire axle 5.The formation that tyre testing apparatus 2 adopts makes upper and lower tire axle 4,5 close to each other, thus, tire T can be sandwiched between upper and lower wheel rim 6,7 and be fixed.
Tire axle 4,5 or cylinder arrange load measure device etc., measures the power that tire T under steam produces, the homogeneity of tire T can be measured.
In addition, when carrying out tire test as above, the air pressure adjustment of tire T must be become the air pressure of regulation.Thus, in tyre testing apparatus 2, be equipped with pneumatic circuit 1, this pneumatic circuit 1 or supply pressurized air or discharge pressurized air in tire T from tire T, thus, regulate the pneumatic circuit 1 of tire T internal gas pressure.
As shown in Figure 1, pneumatic circuit 1 possesses from air supply source 10 to the pipe arrangement in tire T, and by being communicated in tire T at the air supply port 9 of air flow circuit 8 open lower side, on air flow circuit 8 up/down perforation, tire axle 4 inside is arranged.Pneumatic circuit 1, by air flow circuit 8 and air supply port 9, enables pressurized air be passed in tire T.
As shown in Figure 2, the formation of pneumatic circuit 1 is the air pressure pressurized air that air supply source 10 produces being adjusted to regulation substantially, supplies to tire T.Pneumatic circuit 1 possesses the path leading to tire T of 2 systems.One is bcad seats system 11, and the tire T short time is expanded, and be pressed on by the tyre bead of tire T on wheel rim 6,7, another is test macro 12, uses when testing tire T.
Further, in the following description, using air supply source 10 side in Fig. 2 as the upstream side of pneumatic circuit 1, in addition, using tire T side as the downstream of pneumatic circuit 1.This upstream side and downstream, consistent with the upstream side of compressed-air actuated flowing (in figure the direction of arrow) when supplying pressurized air in tire T and downstream.
The pressurized air circulated via bcad seats system 11 is adjusted to the air pressure (tyre bead air pressure) of about 400kPa.In addition, the pressurized air circulated via test macro 12 is adjusted to the air pressure (measuring air pressure) of about the 200kPa lower than bcad seats system 11.These bcad seats systems 11 and test macro 12 are at the branched halfway of air supply source 10 to tire T, and after being adjusted to respective air pressure, then interflow is 1 pipe arrangement.
Next, be described in detail about test macro 12 and bcad seats system 11.
The pipe arrangement path of test macro 12 from upstream side to downstream, possess successively air supply source 10, pressure-regulating valve 13, to valve 14, transfer valve 15, intercepter valve (IV) 16, pressure detecting portion 17.In addition, the pipe arrangement path of bcad seats system 11, in the downstream of air supply source 10, from the pipe arrangement branch of test macro 12, after pressing variable valve 22 to be adjusted to tyre bead air pressure, is collaborated at transfer valve 15 place and test macro 12 for same pipe arrangement by tyre bead.
Air supply source 10 is by the supply source of compressor (omitting diagram) isopressor factory air, in order to produce the pressurized air of the air pressure (tyre bead air pressure) be equal to or higher than when making tire T expand by bcad seats system 11.In the downstream of air supply source 10, air cleaner 18 is set, collects the dust etc. flowed into from air supply source 10.In addition, pressure gauge 19 is set in the downstream of air cleaner 18, detects the compressed-air actuated pressure that air supply source 10 produces.Further, in test macro 12, pressure-regulating valve 13 is equipped with in the downstream of this pressure gauge 19.
Pressure-regulating valve (test pressure variable valve) 13 is the pressure governors pressurized air transported from air supply source 10 being adjusted to authorised pressure, is arranged on the pipe arrangement of the test macro 12 of the downstream branch of air supply source 10.In addition, on the pipe arrangement of bcad seats system 11 arrange have with test press the same tyre bead formed of variable valve 13 to press variable valve 22.
The high pressure air that air supply source 10 produces is depressurized as tyre bead air pressure (such as 400kPa) via tyre bead pressure variable valve 22, is depressurized as measuring air pressure (such as 200kPa) via test pressure variable valve 13.
Compressed-air actuated stream switches in test macro 12 side and bcad seats system 11 side by transfer valve 15, thus the air pressure in tire T is switched between tyre bead air pressure and measuring air pressure.
When the transfer valve 15 of present embodiment is on-state, the pressurized air that pressure is adjusted to tyre bead air pressure can be supplied from the pipe arrangement of bcad seats system 11 in tire T.When transfer valve 15 does not work (off-state), the pressurized air that pressure is adjusted to measuring air pressure can be supplied from the pipe arrangement of test macro 12 in tire T.
Intercepter valve (IV) 16 is the directional control valves being arranged on transfer valve 15 downstream.Intercepter valve (IV) 16 is switched, thus, compressed-air actuated stream can be blocked, pressurized air is enclosed in the pipe arrangement led in the tire T in the downstream of intercepter valve (IV) 16.
The directional control valves being arranged on test pressure variable valve 13 downstream to valve 14.By giving the switching of valve 14, control to be vented (to air release) to tire T to gas with from tire T.
The baroceptor be arranged on to valve 14 downstream is equipped with as pressure detecting portion 17.
In addition, even if utilize test pressure variable valve 13 to be measuring air pressure by the air pressure adjustment acted in tire T like this, also there is subtle change in the air pressure in tire test in tire T sometimes.This air pressure change is very small, is 0.5kPa ~ 1kPa, utilizes pressure degree of regulation to only have the ± test of 0.1% (being about 1kPa when being such as rated for the pressure governor of 1000kPa) pressure variable valve 13, is difficult to regulate.
So, in tyre testing apparatus 2 of the present invention, in order to suppress the barometric fluctuation produced in tire test, the air temperature modification mechanism 21 that the temperature of the air supplied from air supply source 10 to tire T can be adjusted to set point of temperature is set.The temperature of the air supplied to tire T with tyre bead air pressure can be cooled to the temperature lower than external air temperature by air temperature modification mechanism 21 in detail.
Next, the air temperature modification mechanism 21 set by the pneumatic circuit 1 of the 1st embodiment is described in detail.
As shown in Figure 3, the air temperature modification mechanism 21 of the 1st embodiment is arranged on the downstream of air supply source 10 and pressure gauge 19 and on the pipe arrangement of the upstream side of bcad seats system 11 and test macro 12 take-off point.This air temperature modification mechanism 21 has the container 23 being configured in air supply source 10 downstream, the heat exchanger 30 be arranged in this container 23.Heat exchanger 30 has makes cold-producing medium carry out the formation of heat interchange etc. by pipeline.Specifically, as heat exchanger 30, vortex patern pipe etc. can be utilized.The air supplied to tire T preferably utilizes air temperature modification mechanism 21 to cool in advance.
Next, about the temperature temperature of the air supplied to tire T with tyre bead air pressure be reduced to lower than external air temperature, thus tire T internal gas pressure change this point in tire test can be suppressed to be described in detail.
Before expanding with air supply (that is, before being arranged on wheel rim 6,7) tire T and pipe arrangement in the pressure of air be P1 (atmospheric pressure), air themperature is T1 (normal temperature), the air pressure supplied from air supply source 10 is Pa (tyre bead air pressure), and air themperature is Ta.
In this case, calculate and make pressure increase in tire T to the air themperature T2 in tire T during tyre bead air pressure Pa by bcad seats system 11.
If with the air quality in tire T for m, when expanding with air from outside turnover heat be 0 consider adiabatic process time, the balance of energy is represented by formula (1).
[numerical expression 1]
m2·u2-m1·u1＝h·(m2-m1) (1)
In formula (1), m1 is the air quality before expanding, and m2 is the air quality after expanding, and u1 is the ratio energy before expanding, and u2 is the ratio energy after expanding.(m2-m1) represent leaked-in air quality, h is the specific enthalpy of leaked-in air.
At this, if the ratio in tire T can be u=CvT, the specific enthalpy flowing into the air in tire T is h=CpT (C v: specific heat at constant volume constant, Cp: specific heat at constant pressure constant), then formula (1) represents like that such as formula (2).
[numerical expression 2]
m2·Cv·T2-m1·Cv·T1＝Cp·Ta·(m2-m1) (2)
According to equation of state (m=PV/ (RT), R: gas law constant, V: volume) and specific heat ratio γ (=Cp/Cv), then can draw formula (3) by formula (2).
[numerical expression 3]
Pa·V/R-P1·V/R＝γ·Ta·[Pa·V/(R·T2)-P1·V/(R·T1)] (3)
Further, in formula (3), the air pressure P2 after expanding in tire T becomes the pressure identical with the air pressure Pa supplied from air supply source 10, thus, and P2=Pa.
If arrange formula (3) about T2, then draw formula (4).
[numerical expression 4]
At this, setting the air pressure supplied from air supply source 10 is 400kPa (gauge pressure), and air themperature is normal temperature 20 DEG C (external air temperature).In addition, the air pressure in setting expansion front tyre T is atmospheric pressure, and temperature is 20 DEG C (external air temperatures).
In addition, if P1=100kPa (absolute pressure), T1=293K (absolute temperature), Pa=P2=500kPa (absolute pressure), Ta=292K (absolute temperature), γ=1.4, then can be obtained by formula (4), in tire T during bcad seats, temperature T2 rises to 107 DEG C.
Next, when transferring to measuring air pressure from tyre bead air pressure in tire T, from tire T extracting air sharp, thus due to adiabatic expansion, temperature declines.
If with the air pressure in tire T during tyre bead air pressure and temperature for P1, T1, air pressure in tire T during measuring air pressure and temperature are P2, T2, the relation of the pressure and temperature then before and after adiabatic expansion, utilizes specific heat ratio γ, represents with formula (5).
[numerical expression 5]
If setting tyre bead air pressure P1 is 500kPa (absolute pressure), measuring air pressure P2 is 300kPa (absolute pressure), then the absolute temperature T 2 under measuring air pressure is 86% of T1.Thus if the air themperature in tire T during tyre bead air pressure is 107 DEG C (380K), then air themperature when becoming measuring air pressure in tire T is 55 DEG C.
Air themperature in tire T during this measuring air pressure 55 DEG C is much higher than external air temperature 20 DEG C.Thus from the air in tire T to the rubber of tire T or metal wheel rim 6,7, heat trnasfer occurs in tire test, the air themperature in tire T reduces.Temperature difference between the air in tire T and tire T and wheel rim 6,7 is larger, and amount of heat transfer is larger, and along with the air themperature in the tire T that thermal capacity is little constantly declines, the pressure in tire T is declining always.
In fact, during tyre bead air pressure (when the bead part of tire T being arranged on the bcad seats of wheel rim 6,7) also due to heat trnasfer, heat also can spread.Thus confirm by experiment, the air themperature in tire T during bcad seats rises less than 107 DEG C, can only reach about 90 DEG C.In this case, the air themperature in tire T during measuring air pressure is about 40 DEG C.
For this reason, in tyre testing apparatus 2 of the present invention, as the air supplied to tire T with tyre bead air pressure from air supply source 10, be that the air be cooled to via air temperature modification mechanism 21 lower than the temperature of external air temperature is flowed in piping system.
If be-20 DEG C from air supply source 10 with tyre bead air pressure (gauge pressure is for the 400kPa) air themperature flowed in tire T, then according to formula (4), the air themperature in tire T drops to 67 DEG C.Afterwards, if the air pressure in tire T drops to measuring air pressure 200kPa (gauge pressure), then the air themperature in tire T is 21 DEG C, almost identical with external air temperature.In this case, the temperature variation in tire T during tire test is very little, and pressure change does not almost occur.
In fact, the finishing temperature in tire T is also subject to the impact of the temperature variation due to heat trnasfer generation except above-mentioned computing.The temperature setting of cooled air, investigates the value being suitable for each tyre testing apparatus 2 preferably by experiment.In addition, confirm by experiment, when transferring to measuring air pressure from tyre bead air pressure, if the difference of the air themperature in tire T and external air temperature is the scope of ± 5 DEG C, then temperature variation and pressure change are gently.
In the tyre testing apparatus 2 possessing above-mentioned pneumatic circuit 1, carry out tire test according to following order.
First, via the pipe arrangement of bcad seats system 11, be tyre bead air pressure by the air pressure adjustment in tire T.Next, supply the air being cooled to the temperature (such as-20 DEG C) lower than external air temperature via air temperature modification mechanism 21, tire T is expanded at short notice, the bead part of tire T is fixedly mounted in wheel rim 6,7.
In more detail, when the installation of tire T, make transfer valve 15 for on-state, intercepter valve (IV) 16 is off state, thus the air flow circuit of test macro 12 is closed, and the air flow circuit of bcad seats system 11 is opened simultaneously.Thus pressurized air circulates via the road radial tyre T of bcad seats system 11 side, tire T is expanded.
As mentioned above, when being arranged on wheel rim 6,7 by tire T, the air themperature in tire T due to adiabatic expansion, and has raised (such as, under bcad seats air pressure being 67 DEG C) than air themperature when cooling via air temperature modification mechanism 21.
Next, keeping to valve 14 is on-state, and intercepter valve (IV) 16 is off state, makes transfer valve 15 become off-state, thus compressed-air actuated stream is switched to test macro 12, and the air simultaneously in tire T is discharged to outside air flow circuit 8.In addition, utilize the test pressure variable valve 13 be arranged on the pipe arrangement of test macro 12, thus the pressurized air become in the tire T of tyre bead air pressure is switched to measuring air pressure.
Now, the air generation adiabatic expansion in tire T, the air themperature in tire T drops to roughly external air temperature (such as, under measuring air pressure being 21 DEG C).
Like this, by be equipped with about-20 DEG C cold air tire T in pressure be reduced to measuring air pressure from tyre bead air pressure, thus the air themperature in tire T is almost identical with external air temperature, temperature variation during tire test (about 1 second) is very little., from formula (5), almost there is not pressure change in its result.
That is, owing to arranging Air flow from air supply source 10 to tire T that supply from the air temperature modification mechanism 21 to the temperature lower than external air temperature, thus, can suppress to utilize pressure governor to be difficult to the barometric fluctuation regulated.Thus, in tire test, the air in tire T can be maintained measuring air pressure, homogeneity can be measured accurately.
[the 2nd embodiment]
Next, be described about the pneumatic circuit 1 of the 2nd embodiment and the tyre testing apparatus 2 that possesses it.
As shown in Figure 4, the pneumatic circuit 1 of the 2nd embodiment and the difference of the 1st embodiment are to have exhaust unit 24 as air temperature modification mechanism 21.Exhaust unit 24 by the air in container 23 with tyre bead air pressure to tire T supply before, it is externally discharged, to produce adiabatic expansion.
In addition, in the pneumatic circuit 1 of the 2nd embodiment, air supply source 10 can supply the air of the pressure (such as about 800kPa) higher than tyre bead air pressure.
Air temperature modification mechanism 21 possesses the container 23 of the upstream side of downstream and bcad seats system 11 and test macro 12 take-off point being configured in pressure gauge 19.This container 23 possesses surplus valve 33 via intercepter valve (IV) 32.In addition, intercepter valve (IV) 31 is also set in the upstream of container 23, to allow to block the stream from air supply source 10.
By these intercepter valve (IV) 31,32 and surplus valve 33, form exhaust unit 24.
At this, carry out air cooled situation to utilizing the air temperature modification mechanism 21 of the 2nd embodiment and be described.
Before the air of tyre bead air pressure is made tire T expansion to tire T supply, intercepter valve (IV) 31 is off, and air supply source 10 is the state be connected with container 23.Further, intercepter valve (IV) 32 is also off, and is the state disconnected with surplus valve 33.
Now, container 23 is built with the pressure-air of the 800kPa of external air temperature.
Before being about to carry out bcad seats, first making intercepter valve (IV) 31 for connecting, pneumatic circuit 1 and air supply source 10 are blocked.Afterwards, making intercepter valve (IV) 32 for connecting, connecting the stream with surplus valve 33, the pressure in container 23 being sharply reduced to the tyre bead air pressure (gauge pressure is about 400kPa) of regulation.Afterwards, making transfer valve 15 for connecting, in tire T, supplying the air of this tyre bead air pressure.
According to formula (5), if the air pressure P1 before adiabatic expansion is 900kPa (absolute pressure), air themperature T1 is external air temperature (293K), air pressure P2 after adiabatic expansion is 500kPa (absolute pressure), γ=1.4, then the air themperature T2 under tyre bead air pressure can drop to-25 DEG C.
Further, the surplus valve 33 of tyre bead air pressure set by container 23 regulates, thus the tyre bead pressure variable valve 22 of Fig. 4 not must be arranged.In this case, when air supply source 10 is connected with container 23, the pressure of bcad seats system 11 entirety becomes tyre bead air pressure.Thus, utilize surplus valve 33 relief pressure, thus, can by Air flow whole in the pipe arrangement of bcad seats system 11.
When the capacity relative of container 23 is when the air containment of tire T is enough not large, in the manner, tyre bead air pressure reduces.Thus the resulting pressure in container 23, according to the volume ratio of container 23 and tire T, can set high than target tyre bead air pressure.In addition, pressure-regulating valve (can switch tyre bead air pressure and the valve higher than the pressure of tyre bead air pressure) also can be set separately between air supply source 10 and container 23, in bcad seats from air supply source 10 with tyre bead air pressure air supply, thus cooled air is expressed into tire T and supplies in container 23.
Further, in the 2nd embodiment other form and action effect identical with the 1st embodiment, therefore the description thereof will be omitted.
The present invention is not limited to the respective embodiments described above, in the scope not changing invention essence, can be suitable for the shape, structure, material, combination etc. that change each component.
In above-mentioned embodiment, describe the present invention for homogeneity machine as tyre testing apparatus 2.But, pneumatic circuit 1 of the present invention also can use in the tyre testing apparatus carrying out the evaluation beyond homogeneity.
The Japanese patent application (Patent 2009-222463) that the application applied for according on September 28th, 2009, chooses its content as reference at this.
Symbol description
1-pneumatic circuit
2-tyre testing apparatus
3-frame
The upper tire axle of 4-
Tire axle under 5-
The upper wheel rim of 6-
Wheel rim under 7-
8-air flow circuit
9-air supply port
10-air supply source
11-bcad seats system
12-test macro
13-pressure-regulating valve (test pressure variable valve)
14-is to valve
15-transfer valve
16-intercepter valve (IV)
17-pressure detecting portion
18-air cleaner
19-pressure gauge
21-air temperature modification mechanism
22-tyre bead pressure variable valve
23-container
24-exhaust unit
30-heat exchanger
T-tire.
Claims (5)
1. a pneumatic circuit for tyre testing apparatus, described tyre testing apparatus possesses to the air fed air supply source of the tire be arranged between a pair wheel rim,
The pneumatic circuit of described tyre testing apparatus possesses air temperature modification mechanism, and the temperature of the air supplied to described tire from described air supply source can be adjusted to set point of temperature by this air temperature modification mechanism,
The feature of the pneumatic circuit of described tyre testing apparatus is,
The pneumatic circuit of described tyre testing apparatus possesses pressure-regulating valve, the pressure of air that this pressure-regulating valve will supply from described air supply source to tire, be adjusted to the tyre bead air pressure that is arranged between described wheel rim for making described tire inflation or the measuring air pressure used when tire test lower than described tyre bead air pressure
The temperature of the air supplied to described tire with described tyre bead air pressure can be cooled to the temperature lower than external air temperature by described air temperature modification mechanism.
2. the pneumatic circuit of tyre testing apparatus according to claim 1, is characterized in that,
Described air temperature modification mechanism has the heat exchanger of air can preserved from the container of the air of described air supply source and the described container of cooling.
3. the pneumatic circuit of tyre testing apparatus according to claim 1, is characterized in that,
Described air temperature modification mechanism has can with the storage of the state of the high pressure higher than described tyre bead air pressure from the container of the air of described air supply source with carrying out the exhaust unit of adiabatic expansion with described tyre bead air pressure to being discharged to the outside by the air in described container before tire air supply.
4. a tyre testing apparatus, is characterized in that,
Possesses the pneumatic circuit in claims 1 to 3 described in any one.
5. a tire testing method, comprising:
By being supplied to tire by the air being adjusted to tyre bead air pressure, make described tire inflation and the operation be arranged between a pair wheel rim;
The operation of the characteristic of described tire is measured under the state supplying the air of the measuring air pressure giving the pressure be adjusted to lower than described tyre bead air pressure to the described tire be arranged between described wheel rim,
The feature of described tire testing method is,
The temperature of the air supplied to tire with described tyre bead air pressure is cooled to the temperature lower than external air temperature.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009-222463 | 2009-09-28 | ||
| JP2009222463A JP5059075B2 (en) | 2009-09-28 | 2009-09-28 | Pneumatic circuit of tire test apparatus, tire test apparatus and tire test method |
| PCT/JP2010/066608 WO2011037212A1 (en) | 2009-09-28 | 2010-09-24 | Air pressure circuit of tire testing device, tire testing device, and tire testing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102510999A CN102510999A (en) | 2012-06-20 |
| CN102510999B true CN102510999B (en) | 2015-01-07 |
Family
ID=43795954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201080042253.5A Expired - Fee Related CN102510999B (en) | 2009-09-28 | 2010-09-24 | Air pressure circuit of tire testing device, tire testing device, and tire testing method |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP5059075B2 (en) |
| CN (1) | CN102510999B (en) |
| WO (1) | WO2011037212A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6022987B2 (en) * | 2013-04-03 | 2016-11-09 | 株式会社神戸製鋼所 | Pneumatic circuit for tire testing equipment |
| ES2615909T3 (en) * | 2014-09-23 | 2017-06-08 | Snap-On Equipment S.R.L. | Improved procedure and device for mounting or removing tires on tires |
| DE112015007230B4 (en) * | 2015-12-24 | 2022-01-05 | Mitsubishi Heavy Industries Machinery Systems, Ltd. | TIRE INSPECTION MACHINE AND TIRE INSPECTION PROCEDURE WITH TIRE INSPECTION MACHINE |
| JP6657520B2 (en) | 2016-02-03 | 2020-03-04 | 株式会社神戸製鋼所 | Tire air filling mechanism and tire air filling method of tire testing device |
| CN110333145B (en) * | 2019-07-15 | 2022-04-01 | 苏州热工研究院有限公司 | High-temperature bulging test device and method for miniature sample |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4233838A (en) * | 1979-05-22 | 1980-11-18 | Uniroyal, Inc. | Load control for tire test machine |
| US5291776A (en) * | 1992-04-13 | 1994-03-08 | Akron Special Machinery | Tire inflation regulator for tire uniformity machine |
| US6203748B1 (en) * | 1997-07-03 | 2001-03-20 | Bridgestone Corporation | Tire configuration control method, holding apparatus for post cure inflation, and post cure inflation apparatus |
| CN201051034Y (en) * | 2007-06-20 | 2008-04-23 | 中国电子科技集团公司第三十八研究所 | Air pressure simulation device based on tyre pressure monitoring system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0560640A (en) * | 1991-09-05 | 1993-03-12 | Kobe Steel Ltd | Apparatus and method for inflating tyre |
| JP3842385B2 (en) * | 1997-07-03 | 2006-11-08 | 株式会社ブリヂストン | Tire shape adjustment method |
| JP4103952B2 (en) * | 2002-05-10 | 2008-06-18 | 横浜ゴム株式会社 | Post-curing / tire finishing / measuring method and apparatus after tire vulcanization molding |
-
2009
- 2009-09-28 JP JP2009222463A patent/JP5059075B2/en not_active Expired - Fee Related
-
2010
- 2010-09-24 CN CN201080042253.5A patent/CN102510999B/en not_active Expired - Fee Related
- 2010-09-24 WO PCT/JP2010/066608 patent/WO2011037212A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4233838A (en) * | 1979-05-22 | 1980-11-18 | Uniroyal, Inc. | Load control for tire test machine |
| US5291776A (en) * | 1992-04-13 | 1994-03-08 | Akron Special Machinery | Tire inflation regulator for tire uniformity machine |
| US6203748B1 (en) * | 1997-07-03 | 2001-03-20 | Bridgestone Corporation | Tire configuration control method, holding apparatus for post cure inflation, and post cure inflation apparatus |
| CN201051034Y (en) * | 2007-06-20 | 2008-04-23 | 中国电子科技集团公司第三十八研究所 | Air pressure simulation device based on tyre pressure monitoring system |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2003-326610A 2003.11.19 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2011037212A1 (en) | 2011-03-31 |
| CN102510999A (en) | 2012-06-20 |
| JP5059075B2 (en) | 2012-10-24 |
| JP2011069772A (en) | 2011-04-07 |
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