CN106457929A - Tire - Google Patents

Abstract

A pneumatic tire (1) provided with a bead portion (2) including a bead core (10), and a carcass layer (3) folded over around the bead core (10) in the bead portion (2), wherein the bead portion (2) includes a bead inner-surface portion (21) disposed inside the carcass layer (3) in a tire width direction (W) and comprising a region extending from a bead toe (2a) toward the outside in a tire radius direction, the bead inner-surface portion (21) includes a raised portion (100) in at least a part thereof rising toward the inside in the tire width direction.

Description

Tire

Technical field

The present invention relates to tire.

Background technology

In the past, it is proposed that the knocking over coming off from wheel rim because putting on the cross force of side of sidewall portion of tire for bead part carries High-durability energy, i.e., the various technology of anti-wheel rim deciduous (with reference to patent documentation 1).

The tire of patent documentation 1 possesses pair of right and left bead part, extends to tire radial outside respectively from these bead part Side of sidewall portion and the fetus face linking these side of sidewall portion, be configured with belt in the inside of fetus face.In addition, this tire is joined It is set to, it is prominent towards side of sidewall portion side from the end of belt that what hardness was bigger than fetus face and side of sidewall portion strengthens rubber.According to special The tire of sharp document 1, it is possible to increase anti-wheel rim comes off performance.

Prior art literature

Patent documentation

Patent documentation 1：Japanese Unexamined Patent Publication 2007-083946 publication

Content of the invention

Invent problem to be solved

In the prior art, tire described above is like that, although proposing the technology making anti-wheel rim deciduous improve, real Border situation is desirable to further improve.

The present invention is in view of this situation and the scheme that proposes are it is therefore intended that provide one kind that anti-wheel rim can be made to come off performance The tire improving.

For solving the scheme of problem

In order to solve above-mentioned problem, inventor etc. studies in detail to knocking over.Itself it is found that：In pneumatic tire In, until during knocking over, producing warping phenomenon (in detail will be in narration hereinafter) in bead part.

The first scheme of the present invention, based on above-mentioned opinion, has following feature.The tire of the first scheme of the present invention (fills Air filled tyre 1) possess：There is the bead part (bead part 2) of bead core (bead core 10)；And the week in bead part and in bead core Enclose the body piles (body piles 3) turning back, in above-mentioned tire, bead part has face in tyre bead (face 21 in tyre bead), this tire Facial in circle (face 21 in tyre bead) is inside the tire width direction of body piles, and is tire toe (tire toe 2a) to tire radial direction The region in outside, in tyre bead, at least a portion of face, is provided with the protrusion (protrusion to tire width direction medial eminence 100).

Preferably the tire of the first scheme of the present invention protrusion by 60～100 ° of duroscope A hardness model Rubber components in enclosing is constituted.

The height of the preferred protrusion of the tire of the first scheme of the present invention is on tire width direction in bead core In the range of the 3% to 15% of the width of the bead part of heart position.

Preferably the tire radial direction inner side of the protrusion of the tire of the first scheme of the present invention end (tire radial direction inner side End 100b) it is arranged to separate to tire radial outside from tire toe.

Face preferably in the tyre bead of the tire of the first scheme of the present invention, and outside the tire width direction of protrusion It is provided with matrix part (matrix part 110), matrix part and protrusion are made up of identical rubber components.

Face preferably in the tyre bead of the tire of the first scheme of the present invention, and outside the tire width direction of protrusion It is provided with matrix part, be provided with reinforcing cord layer (reinforcing cord layer 300) in the inside of matrix part.

The reinforcing cord layer being preferably provided at the inside of the matrix part of the tire of the first scheme of the present invention has to relatively The cord extending in the direction of tire peripheral, oblique.

The bead part of the preferably tire of the first scheme of the present invention also has tyre bead matrix part (tyre bead matrix part 22), this tire Cycle basis body (tyre bead matrix part 22) is the tire radial direction inner side of body piles, and is the area to tire width direction for the tire toe Domain, in tyre bead, the surface of face is provided with high friction portion (high friction portion 400), and this high friction portion (high friction portion 400) has ratio The tyre bead matrix part coefficient of friction big with respect to the coefficient of friction of predetermined object surface.

The tire of the preferably first scheme of the present invention is the tire being assigned with vehicle assembly direction, has the tyre bead of protrusion Portion is provided only on outside vehicle assembly direction.

Face preferably in the tyre bead of the tire of the first scheme of the present invention, and outside the tire width direction of protrusion It is provided with matrix part, above-mentioned protrusion and matrix part are mutually independent, are adhered to matrix part.

The effect of invention is as follows.

Come off the tire of performance in accordance with the invention it is possible to providing and can improving anti-wheel rim.

Brief description

Fig. 1 is the partial sectional view of airtyred tire width direction along first embodiment and tire radial direction.

Fig. 2 is the amplification view of the airtyred bead part of first embodiment.

Fig. 3 A is the sectional view being used for the process of bead unseating test is illustrated in the pneumatic tire of prior art.

Fig. 3 B is the sectional view being used for the process of bead unseating test is illustrated in the pneumatic tire of prior art.

Fig. 4 is the sectional view for illustrating to airtyred effect and the effect of first embodiment.

Fig. 5 A is the amplification view of the airtyred structure representing variation.

Fig. 5 B is the amplification view of the airtyred structure representing variation.

Fig. 5 C is the amplification view of the airtyred structure representing variation.

Fig. 5 D is the amplification view of the airtyred structure representing variation.

Specific embodiment

[first embodiment]

Hereinafter, referring to the drawings the tire of the first embodiment of the present invention is illustrated.In addition, in following accompanying drawing In record, for the same or like symbol of same or like part mark.But, accompanying drawing is schematic figure, should It is different from actual that this notices ratio of each size etc..Therefore, specific size etc. should judge with reference to the following description.Separately Outer it goes without saying that also comprising the different part of the relation of size each other, ratio to each other in accompanying drawing.

(1) airtyred overall structure

Fig. 1 is the tire width direction W of the pneumatic tire 1 along first embodiment and the broken section of tire radial direction D Figure.Fig. 2 is the amplification view of the bead part of pneumatic tire 1 of present embodiment.

Pneumatic tire 1 has a pair of bead portion 2, body piles 3, side of sidewall portion 4 and fetus face 5.Additionally, the example in Fig. 1 In, illustrate only the bead part 2 of the side in a pair of bead portion, eliminate the bead part of the opposing party.

Additionally, assembling steel ring 8 in pneumatic tire 1.Steel ring 8 is formed with hill portion on the surface of the side abutting with tire 85.If assembling pneumatic tire 1 to steel ring 8, the sealing 81 of steel ring 8 and flange part 82 are supported with the bead part 2 of pneumatic tire 1 Connect.Additionally, steel ring 8 is regular wheel rim.

" regular wheel rim " refers to the annual version rule of yearbook (Year Book) 2008 with JATMA (Japanese car tire association) The fixed standard wheel rim being suitable for specification.The standard wheel rim being suitable for specification described in following specification is referred to beyond Japan.Concrete and Speech, specification is by the region effective industry specification regulation producing or using tire.For example, it is tire and wheel in the U.S. Rim association (The Tire and Rim Association (TRA) Inc.) yearbook (Year Book), is European tyre in Europe Rim Technical Organisation (The European Tyre and Rim Technical Organization (ETRTO) manual of standards (Standards Manual).

Bead part 2 has bead core 10 and bead-core 11.Bead part 2 is configured in the inner side of tire radial direction D and steel ring 8 phase Connect.

Body piles 3 are extended with ring-type between a pair of bead core 10.Body piles 3 are in bead part 2 and around bead core 10 Turn back.

In addition, bead part 2 has：Face 21 in the tyre bead inside the tire width direction W of body piles 3；Located at tire Tyre bead matrix part 22 inside tire radial direction D of body layer 3；And outside the tyre bead outside the tire width direction W of body piles 3 Face 23.Additionally, between tyre bead matrix part 22 and tyre bead external 23, being provided with connection tyre bead matrix part 22 and tyre bead external 23 wheel heel 24.

In tyre bead, facial 21 inside the tire width direction W of body piles 3, and is tire toe 2a to tire radial direction D Region.Additionally, in present embodiment, in tire width direction W section, by upside imaginary line L1 and downside imaginary line L2 Between be defined as region A1 in the case of, in tyre bead face 21 be region A1, wherein, upside imaginary line L1 is by bead core 10 Tire radial direction D outside end 10a and the imaginary line along tire width direction W, downside imaginary line L2 be by tire toe 2a and Imaginary line L2 along tire width direction W.

In tyre bead, face 21 is provided with the tyre bead inner peripheral surface 21a extending outside tire toe 2a is to tire radial direction D.Tyre bead inner face The tyre bead inner peripheral surface 21a in portion 21 is configured to, and when pneumatic tire 1 is assembled on steel ring 8, separates with the hill portion 85 of steel ring 8. In other words, tire toe 2a is configured to, and when pneumatic tire 1 is assembled on steel ring 8, separates with the hill portion 85 of steel ring 8.

Tyre bead matrix part 22 is in the tire radial direction inner side of body piles 3, and is outside tire toe 2a to tire width direction W Region.It is provided with the tyre bead matrix face 22a extending to from tire toe 2a outside tire width direction W in tyre bead matrix part 22.Tyre bead base Honorable 22a extends to wheel heel 24 from tire toe 2a.When pneumatic tire 1 is assembled on steel ring 8, tyre bead matrix face 22a and steel The sealing 81 of circle 8 abuts.Additionally, according to guaranteeing the viewpoint that pneumatic tire 1 is with respect to the wheel rim assembling property of steel ring 8, tyre bead Matrix part 22 is preferably made up of the rubber components in the range of 55～65 ° of duroscope A hardness.

In addition, the shape of tyre bead matrix part 22 is formed as linear in tire width direction W section.Additionally, wheel heel 24 shape forms arc-shaped in tire width direction W section.Tyre bead matrix part 22 with wheel heel 24 border can also be Shape in tire width direction W section turns to the part of arc-shaped from linear change.

Tyre bead external 23 has the tyre bead outer peripheral face 23a extending outside wheel heel 24 is to tire radial direction D.In inflated wheel When tire 1 is assembled on steel ring 8, tyre bead outer peripheral face 23a is abutted with the flange part 82 of steel ring 8.

Fetus face 5 has the ground plane connecting with road surface.It is provided with fetus face 5 is entered inside tire radial direction D of fetus face 5 The belt 6 that row is strengthened.Belt 6 has the multiple belts being made up of organic fiber cord or the steel protector of high intensity 6a～6b.

Side of sidewall portion 4 is connected with outside tire radial direction D of bead part 2.Side of sidewall portion 4 prolongs between bead part 2 and fetus face 5 Stretch.

(2) structure of bead part

Next, illustrating in detail to the structure of bead part.As shown in Fig. 2 the bead part 2 in present embodiment is provided with to wheel The protrusion 100 of tire width W medial eminence.Specifically, in the tyre bead of bead part 2 face 21 at least a portion, It is provided with the protrusion 100 to tire width direction W medial eminence.In addition, facial 21 in tyre bead, and the wheel in protrusion 100 Outside tire width W, it is provided with matrix part 110.

At least a portion of protrusion 100 face 21 in tyre bead.Alternatively, it is also possible in other words, protrusion 100 At least a portion face 21 in tyre bead.Additionally, protrusion 100 can also in tyre bead face 21 whole.

Here, in present embodiment, protrusion 100 is configured to, reliably outside the tire width direction W of bead core 10 Side.Specifically, in present embodiment, in tyre bead, face 21 has face 211 in bead core, and protrusion 100 is arranged to comprise In bead core, face 211 is whole.Additionally, face 211 is between upside imaginary line L1 and intermediate hypothesis line L3 in bead core Region A2, wherein, upside imaginary line L1 be by tire radial direction D of bead core 10 outside end 10a and along tyre width side To the imaginary line of W, intermediate hypothesis line L3 be by tire radial direction D of bead core 10 inside end 10b and along tyre width side Imaginary line to W.

Protrusion 100 is preferably with tire circumference (i.e. the direction orthogonal with tire width direction W and tire radial direction D) Upper continuous mode is arranged.

Protrusion 100 and matrix part 110 can also be configured to be made up of identical rubber components.Specifically, in tyre bead Interior facial 21, protrusion 100 and other parts can also be configured to be made up of identical rubber components.According to this structure, can Realize the generalization of rubber components.

In addition, protrusion 100 can also be configured to by the rubber in the range of 60～100 ° of duroscope A hardness Glue component is constituted.In addition, protrusion 100 is preferably by the rubber section in the range of 75～100 ° of duroscope A hardness Part is constituted, and is more preferably made up of the rubber components in the range of 90～100 ° of duroscope A hardness.

The height D10 of protrusion 100 tyre bead preferably in the center C of bead core 10 on tire width direction W In the range of the 3% to 15% of the width in portion 2.Specifically, the width of this bead part 2 is from tire on tire width direction W The width of circle inner peripheral surface 21a to tyre bead outer peripheral face 23a, the height D10 of protrusion 100 is preferably the 3% of the width of this bead part 2 Ratio in the range of 15%.The height D10 of protrusion 100 is on tire width direction W more preferably in bead core 10 In the range of 5% to 10% of the width of bead part 2 in the C of center.Additionally, the height D10 of protrusion 100 can also be Below 1mm.

End 100a outside tire radial direction D of protrusion 100 can also be than in imaginary line L1 roller tire radial direction D of upside Side.Additionally, according to the viewpoint configuring protrusion 100 on the imaginary line L1 of upside, the end 100a of protrusion 100 can also be arranged Outside than upside imaginary line L1 roller tire radial direction D.Additionally, being arranged on ratio upside imaginary line in the end 100a of protrusion 100 In the case of outside L1 roller tire radial direction D, the end 100a of protrusion 100 and upside imaginary line L1 is in the distance of tire radial direction D S10 is substantially unrelated with knocking over performance.Therefore, can also be changed according to the height D10 of protrusion 100 apart from S10.By this Change, in the release operation forming protrusion 100, it is possible to increase the manufacturing such as formability of protrusion 100 (easily makes and pushes away Go out the hard rubber in operation).

End 100b inside tire radial direction D of protrusion 100 can also be arranged on than intermediate hypothesis line L3 roller tire footpath To outside D.End 100b inside tire radial direction D of protrusion 100 can also be arranged to outside tire toe 2a is to tire radial direction D Only separate preset distance S20.Preset distance S20 is at the end that tire radial direction D can also be inside tire radial direction D of bead core 10 Less than the 1/3 of the thickness (maximum gauge) of portion 10b to the tyre bead matrix face 22a of tyre bead matrix part 22.In the case of being somebody's turn to do, will inflate When tire 1 is assembled on steel ring 8, it is prevented from the deficiency of tire toe 2a, therefore, it is possible to improve wheel rim assembling property.

(3) effect and effect

Effect and effect to embodiments of the present invention illustrate.Here, first to being carried out by inventor etc. Research contents illustrates.

In order to improve endurance quality for knocking over (wheel rim come off performance), inventor etc. is ground in detail to knocking over Study carefully.It is it was found that in pneumatic tire, up to during knocking over, producing warping phenomenon in bead part (in detail will be in rear Literary composition narration).

Fig. 3 A～Fig. 3 B is the sectional view being used for the process of bead unseating test is illustrated in the tire of prior art.As Shown in Fig. 3 A, if applying pneumatic tire towards cross force Fin inside tire width direction W, side of sidewall portion 4 bends, and Produce the phenomenon (hereinafter referred to as warping phenomenon) that in the tyre bead of bead part 2, face 21 collapses.When creating warping phenomenon, tyre bead In the tyre bead in portion 2, face 21 is abutted with the hill portion 85 of steel ring 8.Now, in the tyre bead of bead part 2 face 21 rubber components court To the deformation of tire radial direction D.Specifically, in tyre bead, the rubber components of face 21 is become due to the flowing f1～f2 shown in Fig. 3 A Shape.As a result, the narrower intervals in bead core 10 and body piles 3 and hill portion 85.And, as shown in Figure 3 B, the tire of bead part 2 In circle while the surface of tyre bead inner peripheral surface 21a friction projection valley 85 of face 21, if bead core 10 and body piles 3 get over excess convexity Valley 85, then reach knocking over (wheel rim comes off).

In addition, inventor etc. finds, even if creating warping phenomenon, if bead core 10 and body piles 3 are not across convex Valley 85, then, after cross force Fin eliminates, bead core 10 and body piles 3 are returned to original position.

So, inventor etc. has obtained following opinion, i.e. when creating warping phenomenon, if produced towards tire width Resistance Fout outside degree direction W, does not make bead core 10 and body piles 3 cross hill portion 85 and come off it becomes possible to improve wheel rim Performance, thus complete the present invention.

The pneumatic tire 1 of the first embodiment of the present invention has bead part 2.Bead part 2 has face 21 in tyre bead.? In tyre bead, at least a portion of face 21 is provided with the protrusion 100 to tire width direction W medial eminence.

According to this structure, because in tyre bead, face 21 is provided with protrusion 100, even if therefore producing warping phenomenon, pass through Protrusion 100 is abutted with the hill portion 85 of steel ring 8 such that it is able to produce towards the resistance Fout outside tire width direction W.

Here, Fig. 4 is to represent to apply cross force Fin to the pneumatic tire 1 of present embodiment, and produce the shape of warping phenomenon The sectional view of state.As shown in figure 4, producing warping phenomenon in pneumatic tire 1, face 21 and hill portion 85 in the tyre bead of bead part 2 Abut.Now, even if the rubber components of face 21 is become towards tire radial direction D due to the flowing f1～f2 shown in Fig. 4 in tyre bead Shape is it is also possible to be guaranteed between bead core 10 and body piles 3 and hill portion 85 by constituting the rubber components of protrusion 100 Every.Thus, produce the resistance Fout for cross force Fin and come off performance such that it is able to improve anti-wheel rim.

So, the pneumatic tire 1 according to present embodiment, it is possible to increase anti-wheel rim comes off performance.

In addition, in present embodiment, protrusion 100 is arranged at least a portion in face 21 in tyre bead.Here, tyre bead Interior facial 21 is the part abutting with hill portion 85 when creating warping phenomenon.I.e., according to this structure, protrusion 100 passes through The part that is arranged in tyre bead in face 21 and can more reliably produce resistance Fout.

Additionally, protrusion 100 can also be provided only on face 211 in bead core.In the case of being somebody's turn to do, the tire of protrusion 100 End 100a outside radial direction D is located on the imaginary line L1 of upside, and the end 100b inside tire radial direction D of protrusion 100 is located at On intermediate hypothesis line L3.According to this structure, the usage amount of the rubber components of protrusion 100 can be suppressed, and resistance can be produced Power Fout.

In addition, protrusion 100 is preferably by the rubber components structure in the range of 60～100 ° of duroscope A hardness Become.According to this structure, because protrusion 100 is suitable for the big rubber components of hardness, therefore when creating warping phenomenon, protrusion 100 are difficult to be flattened.It is, using the rubber components constituting protrusion 100, bead core 10 and tire can be reliably ensure that Body layer 3 and the interval in hill portion 85.And, face 21 in tyre bead, between the part contacting with hill portion 85 and bead core 10 Rigidity rise, the vertical resistance between tyre bead and hill rises.Thus, produce the resistance Fout for cross force Fin, thus Anti- wheel rim can be improved come off performance.

If additionally, the rubber hardness of rubber components is more than 60 ° of duroscope A hardness, can be reliably Improve anti-wheel rim to come off performance, come off the viewpoint of performance according to more reliably improving anti-wheel rim, preferably Du's sieve rebound is hard More than 60 ° of degree meter A hardness.On the other hand, if the rubber hardness of rubber components is bigger than 100 ° of duroscope A hardness, Then improve the come off effect of performance of anti-wheel rim and arrived maximum, and have from the probability producing crack day.Additionally, protrusion 100 Preferably it is made up of the rubber components in the range of 75～100 ° of duroscope A hardness, more preferably by Du's sieve rebound Rubber components in the range of 90～100 ° of formula Durometer A hardness is constituted.

In addition, the height D10 of protrusion 100 on tire width direction W preferably in the center C of bead core 10 In the range of the 3% to 15% of the width of bead part 2.According to this structure, because the height D10 of protrusion 100 is little, therefore inciting somebody to action When pneumatic tire 1 is assembled on steel ring 8, impact will not be brought to workability.In addition it is possible to prevent pneumatic tire 1 and steel ring 8 Assembling property (i.e., wheel rim assembling property) reduction.

End 100b inside tire radial direction D of protrusion 100 can also be arranged to outside tire toe 2a is to tire radial direction D Only separate preset distance S20.According to this structure, workability when pneumatic tire 1 is assembled on steel ring 8 uprises.Further, since So that bead part 2 and the sealing 81 of steel ring 8 is adjacent to, therefore can also prevent the reduction of wheel rim assembling property.

In addition, pneumatic tire 1 may also mean that the tire surely having vehicle assembly direction.Specifically, pneumatic tire 1 also may be used There is the vehicle assembling outside being located in the case of being assembled to vehicle outside the width of vehicle and be assembled to vehicle In the case of be located at vehicle width inside vehicle assembling inside.In the case of being somebody's turn to do, there is the bead part 2 of protrusion 100 Vehicle assembling lateral direction can also be provided only on.In other words it is also possible to only be located at than equatorial plane CL by automobile-used assembling The bead part 2 of lateral direction is provided with protrusion 100.Come off performance it is also possible to improve based on the anti-wheel rim of knocking in this structure.Separately Outward, according to this structure, with the situation phase forming protrusion 100 in the bead part 2 positioned at automobile-used this both sides of assembling inner side and outer side Ratio can suppress the usage amount of rubber components.Thereby, it is possible to suppress manufacturing cost, and manufacture efficiency can be improved.

In addition, the pneumatic tire 1 of embodiments of the present invention is particularly suitable for defined in specification being riding vehicle wheel The tire of tire.Additionally, specification is yearbook (Year Book) or the European tyre wheel of Japanese car tire association (JATMA) Rim technical organization (ETRTO) manual of standards (Standards Manual) etc..

In addition, the reasons why be suitable for riding tire for vehicles as the pneumatic tire 1 of embodiments of the present invention, can enumerate as Lower reason.Specifically, the truck beyond riding tire for vehicles, bus tire, in tire for heavy loads, due to intrinsic pressure Higher, the contact pressure with tire for the wheel rim is higher, and the endurance quality (anti-wheel rim deciduous) therefore just to knocking over becomes the feelings of problem Condition is less.Additionally, pneumatic tire 1 can also be according to JIS (specification number：JISD4230) or China GB Specification (specification number：Full T examination 182) equal-specification the tire that can be applied to bead unseating test.

In addition, protrusion 100 is preferably provided in tire circumference above continuously.According to this structure, even if in tire circumference Optional position applies cross force Fin, and it all can be made to produce resistance Fout for this cross force Fin, therefore, it is possible to reliably send out Wave anti-wheel rim to come off performance.

[variation]

Bonding, is conceived to the deformation coming to above-mentioned first embodiment with the difference in the structure of first embodiment Example illustrates.Additionally, should notice, each of multiple variation shown below can combine.

(variation 1)

The variation 1 of above-mentioned first embodiment is illustrated.Fig. 5 A is that the airtyred amplification of variation 1 is cutd open View.Face 21 in the tyre bead of present embodiment, and it is provided with matrix part outside the tire width direction W of protrusion 100 110, protrusion 100 and matrix part 110 are configured to be made up of identical rubber components.And, protrusion 100 and matrix part 110 It is made up of the big rubber components of the hardness of the rubber components than tyre bead matrix part 22 for the hardness (below for high durometer rubber part).

According to this structure, the hardness of protrusion 100 and matrix part 110 rubber components than tyre bead matrix part 22 by hardness is big High durometer rubber part constitute, therefore when creating warping phenomenon, though with face 21 and hill in the tyre bead of bead part 2 Portion 85 abuts it is also possible to suppress the rubber components of face 21 in tyre bead to deform towards tire radial direction D further.

It is, according to this structure, when creating warping phenomenon, face 21 in tyre bead can be reliably prevented and be pressed Flat.Thereby, it is possible to guarantee the interval of bead core 10 and body piles 3 and hill portion 85.And, face 21, and convex in tyre bead Rigidity between the part of valley 85 contact and bead core 10 rises, and the vertical resistance between bead part 2 and hill portion 85 rises. In accordance with the above, the resistance Fout for cross force Fin increases.It is thus able to improve further anti-wheel rim to come off performance.

In addition, constituting the high durometer rubber part preferably duroscope A of protrusion 100 and matrix part 110 Rubber components in the range of 60～100 ° of hardness.According to this structure, because protrusion 100 and matrix part 110 use high rigidity Rubber components, therefore when creating warping phenomenon, protrusion 100 and matrix part 110 are also difficult to be flattened.It is, utilizing Constitute the rubber components of protrusion 100 and matrix part 110, bead core 10 and body piles 3 and hill portion can be reliably ensure that 85 interval.Thereby, it is possible to make it reliably produce the resistance Fout for cross force Fin.

If in addition, high durometer rubber part is more than 60 ° of duroscope A hardness, can reliably improve Anti- wheel rim comes off performance, therefore comes off the viewpoint of performance according to improving anti-wheel rim further, preferably duroscope A More than 60 ° of hardness.On the other hand, if bigger than 100 ° of duroscope A hardness, improve anti-wheel rim and come off the effect of performance Fruit becomes maximum, and has the easy probability producing crack.Additionally, constituting the high rigidity rubber of protrusion 100 and matrix part 110 Glue component is preferably the rubber components in the range of 75～100 ° of duroscope A hardness, and more preferably Du sieve returns Rubber components in the range of 90～100 ° of jump formula Durometer A hardness.

Additionally, as the simple method configuring high durometer rubber part in protrusion 100 and matrix part 110, existing Tire in it is considered to the chafer rubber configuring 21 to tyre bead matrix part 22 facial from tyre bead is changed to high rigidity rubber The method of glue component.But, if be made up of the entirety of chafer rubber high durometer rubber part, in tyre bead matrix part 22 With and be configured with high durometer rubber part, worry the deterioration of the durability such as the generation in the deterioration of wheel rim assembleability and crack.Separately On the one hand, in the pneumatic tire 1 of present embodiment, only configure high durometer rubber portion in protrusion 100 and matrix part 110 Part, therefore, it is possible to prevent the deterioration of wheel rim assembleability and the deterioration of durability.

(variation 2)

The variation 2 of above-mentioned first embodiment is illustrated.Fig. 5 B is that the airtyred amplification of variation 2 is cutd open View.In the tyre bead of present embodiment, the inside of the matrix part 110 of face 21, is provided with reinforcing cord layer 300.Further, it is desirable to Reinforcing cord layer 300 has the cord extending with respect to tire circumference to the direction tilting.In addition, reinforcing cord layer 300 Face 211 in bead core can be provided only on.

According to this structure, due to being provided with reinforcing cord layer 300, therefore when creating warping phenomenon, even if bead part 2 In tyre bead, face 21 is abutted with hill portion 85, and also in suppression tyre bead, the rubber components of face 21 deforms towards tire radial direction D.Especially It is, in the case that reinforcing cord layer 300 has the cord extending with respect to tire circumference to the direction tilting, can be more It is reliably suppressed rubber components to the deformation of tire radial direction D.

It is, according to this structure, when creating warping phenomenon, being prevented from tyre bead facial 21 because constituting protrusion 100 and the flowing of rubber components of matrix part 110 and damaged.Thereby, it is possible to guarantee bead core 10 and body piles 3 with convex The interval of valley 85.And, because rubber possesses incompressibility, therefore pass through to suppress rubber flowing f1～f2, actually can Improve rigidity.Therefore, the resistance Fout for cross force Fin increases.It is thus able to improve further anti-wheel rim to come off performance.

Additionally, in present embodiment, in case of reinforcing cord layer 300 is made up of single tyre cord layer (monolayer), but Reinforcing cord layer 300 can also have multiple cord plys.Specifically, reinforcing cord layer 300 can also have by stacking First cord ply of one cord and there is the second cord ply of the second cord to constitute.Should in the case of, the prolonging of the preferably first cord Stretch direction and the bearing of trend of the second cord extends to the direction tilting in tire circumference.Additionally, the extension side of the first cord Can also be different to the bearing of trend with the second cord.

According to this structure, in reinforcing cord layer 300, the bearing of trend of the bearing of trend of the first cord and the second cord is mutual Difference, therefore, it is possible to produce the tension force of cord in a plurality of directions.Therefore, when creating warping phenomenon, can suppress further The deformation of rubber components, in tyre bead, face 21 is difficult to be flattened.It is, utilizing reinforcing cord layer 300, can reliably ensure that Bead core 10 and the interval in body piles 3 and hill portion 85.Further, since the incompressibility of rubber, rubber does not flow, thus with The situation not having reinforcing cord layer 300 is compared, and actually can improve the rigidity of face 21 in tyre bead.Thus, produce for horizontal stroke The performance to the resistance Fout of power Fin such that it is able to the anti-wheel rim of raising comes off.

And, in reinforcing cord layer 300, cord can also be configured to the orthogonal direction of tire circumference, i.e., with respect to The direction that 90 degree of tire peripheral, oblique extends.In other words, cord can also be configured to extend to tire radial direction D.Here, producing It is believed that in the rubber components of face 21 in tyre bead during warping phenomenon, most towards the amount of tire radial direction D deformation.Therefore, root According to this structure, can more reliably suppress rubber components to the deformation of tire radial direction D.This structure in reinforcing cord layer 300 is Especially effective in the case of monolayer.

Additionally, in the case that reinforcing cord layer 300 has multiple cord plys, multiple cord plys comprised at least one Cord ply can also have to the orthogonal direction of tire circumference, i.e., the cord that extends in tire radial direction D.

(variation 3)

The variation 3 of above-mentioned first embodiment is illustrated.Fig. 5 C is that the airtyred amplification of variation 3 is cutd open View.In the tyre bead of present embodiment, tyre bead inner peripheral surface 21a (surface) of face 21 is provided with high friction portion 400, and this height rubs Portion 400 has the coefficient of friction bigger with respect to the coefficient of friction of predetermined object surface than tyre bead matrix part 22.Specifically, height rubs The coefficient of friction of the tyre bead matrix face 22a than tyre bead matrix part 22 for the coefficient of friction in wiping portion 400 is big.In addition, high friction portion 400 sets Put the surface inside the tire width direction W of protrusion 100.

Additionally, in the present embodiment, predetermined object surface is the surface outside tire radial direction D of steel ring 8.In detail and Speech, this predetermined object surface is the surface 85a outside tire radial direction D in hill portion 85.

It is, the coefficient of friction with respect to the surface 85a in hill portion 85 for the tyre bead inner peripheral surface 21a is than tyre bead matrix face 22a Big with respect to the coefficient of friction of the surface 85a in hill portion 85.In other words it is considered that tyre bead inner peripheral surface 21a is with respect to hill portion The frictional force of 85 surface 85a is bigger with respect to the frictional force of the surface 85a in hill portion 85 than tyre bead matrix face 22a.

Additionally, for example, as the method for the coefficient of friction forming high friction portion 400, list the rubber making high friction portion 400 The method that glue component contains the additives such as silicon dioxide.In addition additionally it is possible to use following methods, for example employ loss because The high rubber of number tan δ, or to increase surface area or in surface mount Anti-skid adhesive piece (セ Off テ ィ Off with concavo-convex ォ Network) etc. great friction coefficient part.

According to this structure, due to being provided with high friction portion 400 in tyre bead inner peripheral surface 21a, therefore when creating warping phenomenon, If high friction portion 400 is abutted with hill portion 85, in tyre bead, face 21 can be to tire width direction W medial movement.It is, phase Resistance Fout for cross force Fin increases, and can improve anti-wheel rim further and come off performance.

Additionally, the coefficient of friction of the coefficient of friction in high friction portion 400 and tyre bead matrix face 22a can be by following survey Determine method to obtain.Specifically, the sheet rubber in high friction portion 400 and the sheet rubber of tyre bead matrix part 22 are made.Then, Each sheet rubber is made to contact the surface (predetermined object surface) with the surface 85a identical part in hill portion 85 while measuring friction Coefficient value.The maximum friction coefficient value (μ) now obtaining is coefficient of friction and the tyre bead matrix face 22a in high friction portion 400 Coefficient of friction.

Additionally, the method as the coefficient of friction measuring sheet rubber can be using known various methods.For example, it is also possible to Using frictionometer ((Co., Ltd.) peace field essence mechanism makees made blank experiment machine etc.), using according to specification number The method of JIS K7125 is measuring the coefficient of friction of sheet rubber.In addition, be also based on ball (pin) spiral rotatable (for example, Specification number JISR 1613-1993), ball (pin) disk move back and forth test (for example, specification number JISR 1613-1993), Thrust cylinder formula (for example, specification number JISK7218), ring block type (for example, specification number ASTMG77-05), four ball are (for example, Specification number JIS K2519) or pin-block formula (for example, specification number ASTM D2625-94 (2003)) etc., to measure rubber The coefficient of friction of film.

In addition, the coefficient of friction in high friction portion 400 is preferably more than 1.5 times of the coefficient of friction of tyre bead matrix face 22a, more Plus preferably more than 2 times.

(variation 4)

The variation 4 of above-mentioned first embodiment is illustrated.Fig. 5 D is that the airtyred amplification of variation 4 is cutd open View.Face 21 in the tyre bead of present embodiment, and it is provided with matrix part outside the tire width direction W of protrusion 100 110, protrusion 100 and matrix part 110 are mutually independent, and protrusion 100 is adhered to matrix part 110.Specifically, protrusion 100 Matrix part 110 can be adhered to by bonding agent 150.

Additionally, the pneumatic tire 1 of present embodiment is after the operation that pneumatic tire is carried out with vulcanizing/forming, grand via bonding The operation in portion 100 manufactures.

According to this structure, protrusion 100 and matrix part 110 are mutually independent, there is no need for the gold in vulcanizing/forming Belong to the processing cost that protrusion 100 is formed on mould.Therefore, it is possible to suppress airtyred manufacturing cost.

[comparative evaluation]

Then, for the effect of the clear and definite present invention further, to the inflated wheel using following comparative example and embodiment The comparative evaluation that tire is carried out illustrates.Additionally, the present invention is not subject to any restriction of these examples.

(1) evaluation methodology

Tire using multiple species carries out bead unseating test, and resists the wheel rim performance that comes off and evaluated.Additionally, it is de- Circle test has carried out the numeric value analysis test based on Finite element method (FEM) and has employed the experiment of the tire of material object.

First, the tire of comparative example and the tire of embodiment have been prepared.Specifically, in order to carry out based on Finite element method (FEM) numeric value analysis test, has made the tire (tire model) of comparative example and the tire (tire model) of embodiment 1～6. The manufacture method of the tire model based on Finite element method (FEM) uses known technology, therefore omits detailed description.Separately Outward, in order to carry out the experiment of the tire employing material object, the tire (actual tire) of Comparative examples A and the wheel of embodiment A1 have been prepared Tire (actual tire).Additionally, tire specification is 275/30ZR20.

The tire used of comparative example and Comparative examples A face 21 in tyre bead does not have the tire of protrusion.Embodiment 1～ 6 and embodiment A1 tire used in tyre bead face 21 there is the tire of protrusion.

End position additionally, the tire of embodiment 1～6 and embodiment A1 is configured to, outside tire radial direction D of protrusion Outside 211 roller tire radial directions D more facial than in bead core, the end inside tire radial direction D of protrusion is located at ratio tyre bead in-core Inside facial 211 roller tire radial directions D.In addition, the tire of embodiment 1～5 is configured to, the length of tire radial direction D of protrusion is 15mm, longer than the length of tire radial direction D of face 211 in bead core.The tire of embodiment 6 is configured to, and protrusion is only located at tire In circle in-core face 211, the length phase of facial 211 tire radial direction D in the length of tire radial direction D of protrusion and bead core Deng.Table 1～2 represents the structure of each tire.

Bead unseating test employs the GB specification (specification number according to China：Full T examination 182) test method.Additionally, in examination In testing, by the experiment of the numeric value analysis test based on Finite element method (FEM) and the tire employing material object, in bead part The maximum of the resistance applying, before wheel rim departs from, is obtained on tire width direction.And, to acquired resistance Big value is compared.

(2) evaluation result

Table 1 represents the numeric value analysis result of the test Ji Yu Finite element method (FEM), and table 2 represents experimental result.Additionally, In table 1～2, duroscope A hardness is the value obtained using the method being dependent on JISK6253.

[table 1]

As shown in table 1, in the tyre bead of bead part, the facial tire with protrusion demonstrates the maximum raising of resistance. I.e., demonstrate anti-wheel rim come off performance improve.And, the duroscope A hardness of the rubber components of protrusion is bigger, And protrusion is thicker, the maximum of resistance more improves.

[table 2]

As shown in table 2, even if in employing the experimental result of tire of material object, in the tyre bead of bead part, face has The maximum that the tire of protrusion also demonstrates resistance improves.I.e., demonstrate anti-wheel rim come off performance improve.In addition, shown in table 2 The numeric value analysis result of the test based on Finite element method (FEM) shown in table 1 for the experimental result compared with, although have becoming relatively The tendency of big value, but between the value in the resistance of comparative example and the resistance of embodiment, observed identical tendency.I.e., it is based on The numeric value analysis result of the test of Finite element method (FEM) also demonstrates has sufficient reliability.

[other embodiment]

As described above, disclose present disclosure by embodiments of the present invention, but constitute one of the disclosure Point discussion and accompanying drawing to should not be construed be to limit the invention.

In first embodiment, as shown in Fig. 2 the configuration of tire radial direction D of protrusion 100 is set at least cover bead core Interior facial 211, but the configuration of tire radial direction D of protrusion 100 can also be set to cover the tire radial direction of face 211 in bead core A part (for example, a quarter or half).

In addition, in first embodiment, protrusion 100 is arranged on the part in face 21 in tyre bead, but protrusion 100 Can also be arranged on whole in face 21 in tyre bead.

According to the disclosure, those skilled in the art can understand that embodiment, embodiment and application technology are implemented in various replacements.Cause This, the scope of the technology of the present invention is according to above-mentioned explanation only by the specific item of invention of the scope of appropriate claims Regulation.

The application advocates preferential based on Japan's patent application filed in 13 days June in 2014 the 2014-122546th Power, all the elements of the application by referring to and in typing present specification.

Industrial applicability

In accordance with the invention it is possible to provide the tire that anti-wheel rim can be made to come off performance raising.

The explanation of symbol

1 pneumatic tire, 2 bead part, 2a tire toe, 3 body piles, 4 side of sidewall portion, 5 fetus faces, 6 band bundles Layer, 8 steel rings, 10 bead cores, 11 bead-cores, face in 21 tyre beads, 22 tyre bead matrix parts, outside 23 tyre beads Portion, 24 wheel heels, 81 sealings, 82 flange parts, 85 hill portions, 100 protrusions, 110 matrix parts, 300 add Strong cord ply, 400 high friction portions.

Claims (10)

1. a kind of tire, possesses：

There is the bead part of bead core；And

The body piles turning back in above-mentioned bead part and around above-mentioned bead core,

Above-mentioned tire is characterised by,

Above-mentioned bead part has in tyre bead face, in this tyre bead face inside the tire width direction of above-mentioned body piles, and It is the region to tire radial outside for the tire toe,

In above-mentioned tyre bead, at least a portion of face, is provided with the protrusion to tire width direction medial eminence.

2. tire according to claim 1 it is characterised in that

Above-mentioned protrusion is made up of the rubber components in the range of 60～100 ° of duroscope A hardness.

3. tire according to claim 1 and 2 it is characterised in that

The width of the height of above-mentioned protrusion above-mentioned bead part in the center of above-mentioned bead core on tire width direction 3% to 15% in the range of.

4. the tire according to any one of claims 1 to 3 it is characterised in that

The end of the tire radial direction inner side of above-mentioned protrusion is arranged to separate to tire radial outside from above-mentioned tire toe.

5. the tire according to any one of Claims 1 to 4 it is characterised in that

Face in above-mentioned tyre bead, and it is provided with matrix part outside the tire width direction of above-mentioned protrusion,

Above-mentioned matrix part and above-mentioned protrusion are made up of identical rubber components.

6. the tire according to any one of Claims 1 to 5 it is characterised in that

Face in above-mentioned tyre bead, and it is provided with matrix part outside the tire width direction of above-mentioned protrusion,

It is provided with reinforcing cord layer in the inside of above-mentioned matrix part.

7. tire according to claim 6 it is characterised in that

Above-mentioned reinforcing cord layer has the cord extending to the direction with respect to tire peripheral, oblique.

8. the tire according to any one of claim 1～7 it is characterised in that

Above-mentioned bead part also has tyre bead matrix part, and this tyre bead matrix part is the tire radial direction inner side of above-mentioned body piles, Er Qieshi Region outside from tire toe to tire width direction,

In above-mentioned tyre bead, the surface of face is provided with high friction portion, and this high friction portion has than above-mentioned tyre bead matrix part with respect to pre- The big coefficient of friction of the coefficient of friction of fixed object surface.

9. the tire according to any one of claim 1～8 it is characterised in that

Above-mentioned tire is the tire being assigned with vehicle assembly direction,

The above-mentioned bead part with above-mentioned protrusion is provided only on outside vehicle assembly direction.

10. the tire according to any one of claim 1～9 it is characterised in that

Face in above-mentioned tyre bead, and it is provided with matrix part outside the tire width direction of above-mentioned protrusion,

Above-mentioned protrusion and above-mentioned matrix part are mutually independent, are adhered to above-mentioned matrix part.