CN103900832A - Heavy load tire matrix durability evaluating method - Google Patents
Heavy load tire matrix durability evaluating method Download PDFInfo
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- CN103900832A CN103900832A CN201310625292.3A CN201310625292A CN103900832A CN 103900832 A CN103900832 A CN 103900832A CN 201310625292 A CN201310625292 A CN 201310625292A CN 103900832 A CN103900832 A CN 103900832A
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Abstract
The invention provides a heavy load tire matrix durability evaluating method which includes the test procedure and the evaluating procedure for heavy load tire matrix durability. In the driving test procedure, the inner pressure of P is 160 -260% of a normal inner pressure and the load F is 350 F0 -450% of a normal load; the running speed is 15 -40km / h, and the tested tires running on pre-set twisted roads in a twisting state. The flexural state is that when the width point tire axial direction in the tire axial direction through the bead core most interior point and carcass of the X with respect to the tire axis line is set as angle theta. The point of pressure tire in normal within the theta value theta 0 and running process of tire in the angle theta value difference (theta 1) is in the range of 5 -15 degrees of deflection state. As a result, an evaluating of heavy load tire matrix durability can be realized in a short time.
Description
Technical field
The present invention relates to a kind ofly can reproduce with the damage of the caused body cord of friction of bead core, can evaluate accurately with shorter test period the carcass durability evaluation method of the bead part of the heavy-load tire of carcass permanance with shorter test period.
Background technology
As shown in Figure 6, be equipped with bead core b on the bead part a of heavy-load tire, this bead core b is coiled into multiple row multistage by steel wire coil and forms, and its cross section is polygon, be generally hexagon.In addition the both ends of casingply c that, form the skeleton of tire are engagements by the surrounding's turnover around described bead core b.
But described heavy-load tire is to use under the exacting terms of pressure and high load capacity in high, so larger tension force f acts on the body cord of casingply c.Consequently, on body cord, so-called fretting can occur, fretting refers to the phase mutual friction consumingly between the bight b1 of tire direction of principal axis innermost point P at body cord and bead core b.In addition, also there are the following problems: the sustainable development meeting of the caused abrasion of this fretting causes pretending firmly of body cord to decline, and even tyre explosion of cords break finally occurs.
Therefore, in order to suppress this fretting, carried out various development researches, for example in documents 1, proposed a kind of around bead core form added the rubber layer of staple fibre to prevent the direct technical scheme contacting between body cord and bead core.In addition, following technical scheme has been proposed in documents 2: two-layer tyre bead enhancement Layer is set and suppresses bead distortion, and accompany elastomeric rubber layer between body cord and bead core.In addition, in documents 3, having proposed a kind of inside at bead core forms rubber core and makes bead core have flexible technical scheme.
In addition the tire of researching and developing, need to be used for evaluating the evaluation test of its effect.But, thereby the effective test method of carcass permanance, the appearance of this test method of tight demand are evaluated in the fretting of not reproducing described bead part with shorter test period accurately with shorter test period.
Prior art file:
Documents 1: Japanese Patent Laid-Open 2000-085322 communique
Documents 2: Japanese Patent Laid-Open 2012-106531 communique
Documents 3: Japanese Patent Laid-Open 2005-041392 communique
Summary of the invention
Therefore, problem of the present invention is to provide a kind of and can reproduces with the damage of the caused body cord of friction of bead core, can evaluate accurately with shorter test period the carcass durability evaluation method of the bead part of the heavy-load tire of carcass permanance with shorter test period.
The first technical scheme of the present invention relates to a kind of carcass durability evaluation method of bead part of heavy-load tire, this heavy-load tire has the carcass being made up of casingply, this casingply is in the both sides from fetus face process side wall portion to the casing ply main part of the ring-type of the bead core of bead part, be provided with continuously around described bead core and turn down and the casing ply folding portion of engagement laterally from tire direction of principal axis inner side, the carcass durability evaluation method of the bead part of this heavy-load tire is characterised in that
Comprise:
The operation of travelling, is pressed into the test tire that is assembled with wheel rim on the rotary drum of rotation and it is travelled on rotary drum; And
Evaluate operation, the carcass permanance of the bead part to the tire travelling is evaluated;
Described travelling in operation, the interior pressure P of described test tire is normal air pressure P
0160～260%, load F be normal load F
0350～450%, and travel speed V is 15～40km/h,
And, make to test tire and travel under deflected, described deflected refers to, by tire meridian cross section, while being made as θ by the datum line X of the tire direction of principal axis innermost point of described bead core and the tire direction of principal axis maximum width points of casingply with respect to the angle of tire direction of principal axis line
To test filling tires normal air pressure and there is no the numerical value θ of the described angle θ under the non-loaded normal air pressure state of load
0with the numerical value θ that under the condition of interior pressure P, load F in the described operation of travelling, test tire is pressed into the described angle θ under the state of rotary drum
1poor (θ
0-θ
1) state in the scope of 5～15 °.
In addition, be characterised in that in the second technical scheme, in described evaluation operation, test tire after the evaluation distance of the scope of the 600～1200km that travelled in the described operation of travelling is disintegrated, and the fretting amount of the locational body cord of the tire direction of principal axis innermost point to described bead core is evaluated.
Here, described " normal air pressure " refers to, comprise tire based on the standards system of standard in, this standard is for the interior pressure of each tire defined, if JATMA is hyperbar, if the maximal value that TRA records for " the tire load limit values (TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES) under various cold charge pressures ", if ETRTO is " charge pressure (INFLATION PRESSURE) ".In addition, described " normal load " refer to described standard according to normal air pressure the load for each tire defined, if JATMA is maximum load capability, if the maximal value that TRA records for " the tire load limit values (TIRE LOAD LIMITS AT VARIOUS COLDINFLATION PRESSURES) under various cold charge pressures ", if ETRTO is " load capacity (LOAD CAPACITY) ".
Invention effect:
The present invention stipulates the driving conditions travelling in operation as described above.Therefore, " embodiment " described as follows part is illustrated, can reproduce accurately and the damage of the caused body cord of friction of bead core with shorter test period.Consequently, can evaluate accurately carcass permanance with shorter test period, can give very large contribution to the development research of tire.
Accompanying drawing explanation
Fig. 1 is the concept map that shows the status of implementation of the evaluation method of the carcass permanance of bead part of the present invention.
Fig. 2 is the sectional view that shows an example of the heavy-load tire of the evaluation method of the carcass permanance that is implemented described bead part.
Fig. 3 (A) is the differential seat angle (θ to the tire with the inner tube of a tyre
0-θ
1) rough cross-sectional view that describes, Fig. 3 (B) is the differential seat angle (θ to tubeless tyre
0-θ
1) rough cross-sectional view that describes.
Fig. 4 (A) shows inner pressure ratio P/P
0with the chart of the relation of fretting amount and deviations thereof, Fig. 4 (B) shows duty ratio F/F
0chart with the relation of fretting amount and deviations thereof.
Fig. 5 (A) is the chart that shows the relation of travel speed V and fretting amount and deviations thereof, and Fig. 5 (B) is the poor (θ of angles of display
0-θ
1) with the chart of the relation of fretting amount and deviations thereof.
Fig. 6 is the sectional view that shows the bead part of heavy-load tire.
Symbol description:
1... test tire;
2... fetus face;
3... side wall portion;
4... bead part;
5... bead core;
6... carcass;
6A... casingply;
6a... casing ply main part;
6b... casing ply folding portion;
10... rotary drum;
M... tire direction of principal axis maximum width points;
P... tire direction of principal axis innermost point;
T... heavy-load tire.
Embodiment
Below, embodiments of the present invention are at length described.
Fig. 1 is the concept map of the status of implementation of the evaluation method (hereinafter referred to as " carcass durability evaluation method ") that represents the carcass permanance of bead part of the present invention, described carcass durability evaluation method comprises: the operation of travelling, is pressed into the test tire 1 of assembling wheel rim on the rotary drum 10 of rotation and it is travelled on rotary drum 10; And evaluation operation, the carcass permanance of the bead part 4 to the test tire 1 travelling is evaluated.
Described rotary drum 10 can suitably adopt the rotary drum of the known construction of tire running test use.In addition, as shown in Figure 2, described test tire 1 adopts the heavy-load tire T having from fetus face 2 process side wall portions 3 to the various structures of the carcass 6 of the bead core 5 of bead part 4.In this example, the situation that is the radial with the inner tube of a tyre exemplified with described heavy-load tire T.
Described carcass 6 be by one that metal body cord is formed take the angle assortment of for example 75 °～90 ° with respect to tire Zhou Fangxiang above, in this example as the casingply 6A of forms.This casingply 6A has and is crossed on the casing ply main part 6a of the ring-type between described bead core 5,5 and is connected with its both sides and passes through around above-mentioned bead core 5 from tire direction of principal axis inner side turnover laterally and the casing ply folding portion 6b of engagement.In addition, between described casing ply main part 6a and casing ply folding portion 6b, be equipped with the tyre bead triangle rubber 8 of the tyre bead reinforcement use that extend in outside from bead core 5 to radial direction.
The cross section that described bead core 5 is formed as the steel wire coil to be coiled into multiple row multistage is polygonal ring bodies.These routine bead core 5 cross sections are hexagon, and its one side and wheel rim support ring seat Rs almost parallel make the inlay resultant force between wheel rim R keep evenly thus.This cross section is in hexagonal bead core 5, is equipped with hexagonal bight 5a in the position of tire direction of principal axis innermost point P.
In addition, in the radial direction outside of described carcass 6 and the inside of fetus face 2 be equipped with tyre surface and strengthen the belt 7 of use.This belt 7 be by two that belt cord is formed take the angle assortment of for example 10 °～70 ° with respect to tire Zhou Fangxiang above, in this example as the band bundle casing ply 7A～7D of four forms.
Below, travelling in operation of described carcass durability evaluation method,
(1) the interior pressure P of described test tire 1 is normal air pressure P
0160～260%,
(2) load F is normal load F
0350～450%,
(3) travel speed V is 15～40km/h,
And, under following deflected Y, make to test tire 1 and travel on rotary drum 10.
Described deflected Y is as shown in Fig. 3 (A), by on tire meridian cross section, while being made as X by the datum line of the tire direction of principal axis innermost point P of described bead core 5 and the tire direction of principal axis maximum width points M of casingply 6A, the angle θ of the tire direction of principal axis line based on respect to described datum line X and the deflected of the tire that stipulates.In addition, described tire direction of principal axis maximum width points M special provision is to fill normal air pressure P to test tire 1
0and there is no the non-loaded normal air pressure state Y of load
0under, the position that casingply 6A heaves to tire direction of principal axis outside.
Specifically, deflected Y is described uncharge normal air pressure state Y
0under the numerical value θ of described angle θ
0with the numerical value θ that under the condition of interior pressure P, load F in the described operation of travelling, test tire 1 is pressed into the described angle θ under the state of rotary drum 10
1poor (θ
0-θ
1) state in the scope of 5～15 °.In addition, as shown in Fig. 3 (B), the in the situation that of tubeless tyre, define similarly described angle θ, and by difference (θ
0-θ
1) be limited in the scope of 5～15 °.
In other words, described in travel in operation,
In normal air pressure P
0160～260% scope in interior pressure P,
In normal load F
0350～450% scope in load F,
Speed in scope in 15～40km/h, and
Differential seat angle (the θ of datum line X
0-θ
1) under the condition of deflected Y in the scope of 5～15 °, make to test tire 1 and travel on rotary drum 10.
By the balanced adjustment of described interior pressure P and load F is arrived in described scope, can be easily by described differential seat angle (θ
0-θ
1) be set in described scope.
Set by this condition, can be reproduced in accurately with shorter test period the damage of the caused body cord of friction between body cord and the bead core 5 of position of described innermost point P (bight 5a).Consequently, can evaluate accurately carcass permanance with shorter test period.
In addition,, as shown in Fig. 4 (A), described interior pressure P is lower than normal air pressure P
0160% situation under, the tension force that acts on body cord diminishes, therefore, spended time on wearing away and can not fully realize the shortening of evaluation time.On the contrary, described interior pressure P is higher than normal air pressure P
0260% time, although promoted abrasion, the abrasion deviation of carrying out becomes large, causes evaluation precision to decline.In addition, large because deviation becomes, so may cause tyre explosion in operation travelling.From these points of view, the lower limit of described interior pressure P is preferably normal air pressure P
0more than 180%, the upper limit is preferably below 240%.In addition, preferably, for make interior pressure P can not rise highlyer than setting value originally because of the temperature rise of the tire in travelling, in order to make interior pressures P keep certain pressure-regulating valve etc. that arranges.
In addition,, as shown in Fig. 4 (B), described load F is lower than normal load F
0350% situation under, the tension force that acts on body cord diminishes, and the contact of body cord and bead core 5 also reduces.Therefore, spended time on wearing away, can not fully realize the shortening of evaluation time.On the contrary, described load F is higher than normal load F
0450% time, although promoted abrasion, the abrasion deviation of carrying out becomes large, causes evaluation precision to decline.In addition, large because deviation becomes, so may cause tyre explosion in operation travelling.From these points of view, the lower limit of described load F is preferably normal load F
0more than 330%, the upper limit is preferably below 420%.
In addition, as shown in Fig. 5 (A), in the situation of described travel speed V lower than 15km/h, the repetition frequency of bead distortion reduces, therefore, and spended time on wearing away and can not fully realize the shortening of evaluation time.On the contrary, when described travel speed V exceedes 40km/h, although promoted abrasion, it is large that the deviation that abrasion are carried out becomes, and causes evaluation precision to decline.In addition, large because deviation becomes, so may cause tyre explosion in operation travelling.In addition, the internal temperature of fetus face 2 rises, and may cause first generation on this fetus face 2 to damage and cannot proceed the operation of travelling.From these points of view, more than the lower limit of described travel speed V is preferably 18km/h, the upper limit is preferably below 30km/h.
In addition, as shown in Fig. 5 (B), described differential seat angle (θ
0-θ
1) lower than in the situation of 5 °, the deflection of tire diminishes, therefore the contact of body cord and bead core 5 reduces.Therefore, spended time on wearing away, can not fully realize the shortening of evaluation time.On the contrary, described differential seat angle (θ
0-θ
1) while exceeding 15 °, although promoted abrasion, it is large that the deviation that abrasion are carried out becomes, and causes evaluation precision to decline.In addition, large because deviation becomes, so may cause tyre explosion in operation travelling.In addition, bending deformation is too much, and may cause turnover end (the radial direction outer end of casing ply folding portion 6b) take casingply 6A to be peeled off as the rubber of starting point is that tyre bead damage first occurs to proceed the operation of travelling.From these points of view, described differential seat angle (θ
0-θ
1) lower limit be preferably more than 7 °, the upper limit is preferably below 12 °.
In addition, described Fig. 4 (A) is illustrated in the certain (F/F of duty ratio in the table 1 of following test findings
0=350%) the inner pressure ratio P/P, measuring under the condition of travel speed certain (V=20km/h)
0chart with the relation of fretting amount and deviations thereof.Described Fig. 4 (B) is illustrated in the certain (P/P of inner pressure ratio in the table 1 of following test findings
0=210%) the duty ratio F/F, measuring under the condition of travel speed certain (V=201m/h)
0chart with the relation of fretting amount and deviations thereof.Described Fig. 5 (A) is illustrated in the certain (P/P of inner pressure ratio in the table 1 of following test findings
0=210%), the certain (F/F of duty ratio
0=370%), differential seat angle (θ
0-θ
1) certain ((θ
0-θ
1)=9.2 °) condition under the chart of relation of the travel speed V that measures and fretting amount and deviations thereof.Described Fig. 5 (B) is illustrated in the certain (P/P of inner pressure ratio in the table 1 of following test findings
0=210%) differential seat angle (θ, measuring under the condition of travel speed certain (V=20km/h)
0-θ
1) with the chart of the relation of fretting amount and deviations thereof.
Then, in described evaluation operation, in this example, the pre-determined test tire 1 of evaluating after distance that travelled in the described operation of travelling is disintegrated, the fretting amount of the locational body cord of the tire direction of principal axis innermost point P to described bead core 5 is evaluated.Preferably, described evaluation distance is selected in the scope of 600～1200km.While evaluating distance lower than 600km, fretting quantitative change is few, becomes and is difficult to obtain higher evaluation precision.In addition,, even if exceed 1200km, the deviation that abrasion are carried out also can not diminish, and causes on the contrary the unnecessary increase of test period.
In addition,, as described fretting amount, can adopt sectional area, the abrasion degree of depth or the abrasion volume of the abrasion part of body cord.In addition, these can be by for example obtaining by the abrasion part of laser microscope observation body cord.
In addition, in described evaluation operation, can also be under the precondition of the security of guaranteeing to blow out, measure in the operation of travelling and start from travelling, until test tire 1 reaches operating range or the running time during blowing out, it to be evaluated.
Above, be particularly preferred embodiment elaborated to of the present invention, but the invention is not restricted to illustrated embodiment, can be deformed into various forms and implement.
Embodiment:
In order to confirm effect of the present invention, the heavy-load tire (12.00R20-16PR) that the market of constructing shown in Fig. 2 is sold, as test tire, carries out the evaluation test of carcass permanance under the standard shown in table 1.In addition, test is carried out 10 tires under each condition, and mean value to fretting amount and the deviations of fretting amount compare.
The normal air pressure P0 of described test tire is 7.25kPa, normal load F
0for 30.5kN.Fretting amount is to measure the abrasion volume of the abrasion part of the locational body cord of the tire direction of principal axis innermost point of bead core with laser microscope, uses the mean value of the fretting amount of comparative example 1 is represented to its mean value as 100 index.Numerical value is larger, abrasion to carry out speed faster.
Table 1:
As shown in table 1, can confirm that it can suppress the deviations of fretting amount compared with low and improve evaluation precision, accelerate the carrying out speed of abrasion simultaneously and realize the shortening of test period.
In addition,, in comparative example 3,5, there is tire in operation, to blow out travelling.In addition,, in comparative example 7, there is tire to produce and peel off damage at fetus face because of heating travelling in operation.In addition, in comparative example 9, there is tire to peel off damage take the turnover end of carcass as basic point travelling in operation.
Claims (2)
1. the carcass durability evaluation method of the bead part of a heavy-load tire, this heavy-load tire has the carcass being made up of casingply, this casingply is in the both sides from fetus face process side wall portion to the casing ply main part of the ring-type of the bead core of bead part, be provided with continuously around described bead core and turn down and the casing ply folding portion of engagement laterally from tire direction of principal axis inner side, the carcass durability evaluation method of the bead part of this heavy-load tire is characterised in that
Comprise:
The operation of travelling, is pressed into the test tire that is assembled with wheel rim on the rotary drum of rotation and it is travelled on rotary drum; And
Evaluate operation, the carcass permanance of the bead part to the tire travelling is evaluated;
Described travelling in operation, the interior pressure P of described test tire is normal air pressure P
0160～260%, load F be normal load F
0350～450%, and travel speed V is 15～40km/h,
And, make to test tire and travel under deflected, described deflected refers to, by tire meridian cross section, while being made as θ by the datum line X of the tire direction of principal axis innermost point of described bead core and the tire direction of principal axis maximum width points of casingply with respect to the angle of tire direction of principal axis line
To test filling tires normal air pressure and there is no the numerical value θ of the described angle θ under the non-loaded normal air pressure state of load
0with the numerical value θ that under the condition of interior pressure P, load F in the described operation of travelling, test tire is pressed into the described angle θ under the state of rotary drum
1difference θ
0-θ
1deflected in the scope of 5～15 °.
2. the carcass durability evaluation method of the bead part of heavy-load tire according to claim 1, is characterized in that,
In described evaluation operation, the test tire after the evaluation distance of the scope of the 600～1200km that travelled in the described operation of travelling to be disintegrated, the fretting amount of the locational body cord of the tire direction of principal axis innermost point to described bead core is evaluated.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012283376A JP5986502B2 (en) | 2012-12-26 | 2012-12-26 | Evaluation method of carcass durability at bead part of heavy duty tire |
| JP2012-283376 | 2012-12-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103900832A true CN103900832A (en) | 2014-07-02 |
| CN103900832B CN103900832B (en) | 2018-01-09 |
Family
ID=50992295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310625292.3A Active CN103900832B (en) | 2012-12-26 | 2013-11-28 | The carcass durability evaluation method of the bead part of heavy-load tire |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5986502B2 (en) |
| CN (1) | CN103900832B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107709948A (en) * | 2015-06-15 | 2018-02-16 | 株式会社普利司通 | Method is obtained in load |
| CN110987484A (en) * | 2019-12-26 | 2020-04-10 | 安徽佳通乘用子午线轮胎有限公司 | Indoor evaluation method for endurance performance of belt ply of tire |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6922277B2 (en) * | 2017-03-13 | 2021-08-18 | 住友ゴム工業株式会社 | Tire durability test method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1230924A (en) * | 1997-07-01 | 1999-10-06 | 住友橡胶工业株式会社 | Heavy load radial tire |
| JP2001191724A (en) * | 2000-01-14 | 2001-07-17 | Bridgestone Corp | Pneumatic tire excellent in bead part durability |
| CN101553372A (en) * | 2006-12-08 | 2009-10-07 | 株式会社普利司通 | Heavy duty pneumatic radial tire |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62155108A (en) * | 1985-12-27 | 1987-07-10 | Bridgestone Corp | Pneumatic radial tire |
| JP3422694B2 (en) * | 1998-09-17 | 2003-06-30 | 住友ゴム工業株式会社 | Heavy duty tire |
| JP2005041392A (en) * | 2003-07-24 | 2005-02-17 | Bridgestone Corp | Tire excellent in bead section durability |
| JP5506487B2 (en) * | 2010-03-24 | 2014-05-28 | 株式会社ブリヂストン | Steel cord and pneumatic radial tire using the same |
| JP2012106531A (en) * | 2010-11-15 | 2012-06-07 | Sumitomo Rubber Ind Ltd | Tire for heavy load |
-
2012
- 2012-12-26 JP JP2012283376A patent/JP5986502B2/en active Active
-
2013
- 2013-11-28 CN CN201310625292.3A patent/CN103900832B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1230924A (en) * | 1997-07-01 | 1999-10-06 | 住友橡胶工业株式会社 | Heavy load radial tire |
| JP2001191724A (en) * | 2000-01-14 | 2001-07-17 | Bridgestone Corp | Pneumatic tire excellent in bead part durability |
| CN101553372A (en) * | 2006-12-08 | 2009-10-07 | 株式会社普利司通 | Heavy duty pneumatic radial tire |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107709948A (en) * | 2015-06-15 | 2018-02-16 | 株式会社普利司通 | Method is obtained in load |
| US10766314B2 (en) | 2015-06-15 | 2020-09-08 | Bridgestone Corporation | Load derivation method |
| CN110987484A (en) * | 2019-12-26 | 2020-04-10 | 安徽佳通乘用子午线轮胎有限公司 | Indoor evaluation method for endurance performance of belt ply of tire |
| CN110987484B (en) * | 2019-12-26 | 2021-08-06 | 安徽佳通乘用子午线轮胎有限公司 | Indoor testing method for endurance performance of belt ply of tire |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2014126458A (en) | 2014-07-07 |
| JP5986502B2 (en) | 2016-09-06 |
| CN103900832B (en) | 2018-01-09 |
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