CN107244193A - A kind of pneumatic tire - Google Patents

A kind of pneumatic tire Download PDF

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Publication number
CN107244193A
CN107244193A CN201710543454.7A CN201710543454A CN107244193A CN 107244193 A CN107244193 A CN 107244193A CN 201710543454 A CN201710543454 A CN 201710543454A CN 107244193 A CN107244193 A CN 107244193A
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CN
China
Prior art keywords
bead
radial
tire
rubber sheet
reinforced rubber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710543454.7A
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Chinese (zh)
Inventor
罗才仁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CHENG SHIN RUBBER (CHINA) Co Ltd
Original Assignee
CHENG SHIN RUBBER (CHINA) Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CHENG SHIN RUBBER (CHINA) Co Ltd filed Critical CHENG SHIN RUBBER (CHINA) Co Ltd
Priority to CN201710543454.7A priority Critical patent/CN107244193A/en
Publication of CN107244193A publication Critical patent/CN107244193A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES TYRE INFLATION; TYRE CHANGING OR REPAIRING; REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00Tyre beads, e.g. ply turn-up or overlap
    • B60C15/0009Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES TYRE INFLATION; TYRE CHANGING OR REPAIRING; REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00Tyre beads, e.g. ply turn-up or overlap
    • B60C15/06Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
    • B60C15/0603Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead characterised by features of the bead filler or apex
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES TYRE INFLATION; TYRE CHANGING OR REPAIRING; REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00Tyre beads, e.g. ply turn-up or overlap
    • B60C15/06Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
    • B60C15/0628Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead comprising a bead reinforcing layer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES TYRE INFLATION; TYRE CHANGING OR REPAIRING; REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00Tyre beads, e.g. ply turn-up or overlap
    • B60C15/06Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
    • B60C15/0628Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead comprising a bead reinforcing layer
    • B60C2015/0639Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead comprising a bead reinforcing layer between carcass main portion and bead filler not wrapped around the bead core

Abstract

The application provides a kind of pneumatic tire, including bead part, bead core, sidewall, crown and two layers of casingply;Bead part has bead filling;Its described in the axial direction casingply and the bead filling are provided with the first reinforced rubber sheet between the two, first reinforced rubber sheet is diametrically from the radial direction upper end between two layers of casing ply overlapping, extended downwardly along in the middle of two layers of cord, reach bead filling radial tip, and extend from bead filling axially inner side to downside, the lower edge of the bead core is bypassed, and then upward winding is until bottom;The distance of the first reinforced rubber sheet radial direction upper end and disconnected wide end point is 10~25mm;The bead filling is filled on the upside of the radial direction of the radial direction peak of the bead core upper limb to radial tip, and the vertical range of radial tip to bead is 10~+5mm.The present invention provides a kind of commercial car tire, and there is outstanding distance travelled, tough and hard wear resistant to damage and high weight bearing power for it.

Description

A kind of pneumatic tire
Technical field
The present invention relates to tyre technology, more particularly to a kind of pneumatic tire, be more particularly to it is a kind of have it is outstanding Commercial car (Commercial Vehicle) tire of distance travelled, tough and hard wear resistant damage and high weight bearing power.
Background technology
Tire is mainly the annular elastic rubber product that the ground connection assembled on various vehicles rolls, and Hyundai Motor is most absolutely Number uses pneumatic tire;It is mainly constructed including crown, tire shoulder, sidewall, tyre bead etc..Wherein, crown be tire running with The critical piece of ground, is the whole position between two tire shoulders;Crown includes the tyre surface of direct and road surface contact, cushion Or belt, casing ply (whole internal layer cord is referred to as carcass) etc..Tyre bead is the part of direct and wheel rim contact, its tire It is attached on wheel rim, cord is coated in interface;Tyre bead is made up of steel bead wire, bead core, chafer and other parts.Tire shoulder Between tyre surface and sidewall;Sidewall is located between shoulder and tyre bead.
Along with comprehensive popularization of highway, the especially short-distance transport service of automobile logistics industry has been obtained greatly Development.But, used as the commercial car of the transport main force due to frequently high load, its tire is often unable to reach satisfactory Service life.Fig. 1 is the structural representation of existing commercial car tire, wherein, 1 is tyre bead portion, 2 bead cores, and 3 be filler, 4 It is sidewall position for casingply, 5,6 be tire bead protective rubber.As shown in figure 1, sidewall position (5) axially inner side uses tyre bead Filler (3) and casingply (4) Combination Design, radial direction of the bead filling (3) in the radial direction peak b1 of bead core (2) upper limb Upside, filling to upper end a1, wherein a1 is located at disconnected wide (Breadth Maximum of tire radial section, corresponding left and right sides W1, W2 two Individual end points, W2 is not shown in FIG. 1) end points W1 lower sections;Bead (Rim Line) is f-g, and c1 is the lower edge of bead core (2) Portion.Also, sidewall position (5) axially external use tire bead protective rubber (6) and casingply (4) Combination Design, tyre bead protection Glue (6) is directly contacted due to its wear-resisting characteristic with rim for automobile wheel, to protect tire bead position.
It is above-mentioned in the prior art, with casingply (4) combine bead filling (3), because its height is higher, add The risk that both separate by the curtain yarn and sizing material that are brought when tire is run at high speed under certain loading condition.Meanwhile, it is too high There is the possibility for making riding comfort severe in bead filling (3);Also the sizing material stream of the tyre bead portion (1) when green tire vulcanizes is added Dynamic property, thus triggers the problems such as tyre evenness is not good.If merely the height of reduction bead filling (3), may make tire Side (5) rigidity is not enough, it is impossible to reach the effect of supporting carcass.Therefore, commercial car tire how is taken precautions against in durable traveling The destruction at sidewall position, and then service life is lifted, it is the problem of tyre industry technical staff is in the urgent need to address.
The content of the invention
In view of this, the application provides a kind of pneumatic tire, and the pneumatic tire that the present invention is provided has in outstanding traveling Journey, endurance quality and high weight bearing power.
The present invention provides a kind of pneumatic tire, including two bead parts, two bead cores, two sidewalls, crown and two layers Casingply;
The casingply extends to crown from bead part by sidewall;Each bead part has bead filling;It is special Levy and be, described in the axial direction casingply and the bead filling are provided with the first reinforced rubber sheet, described between the two One reinforced rubber sheet diametrically from the radial direction upper end a between two layers of casing ply overlapping, is extended downwardly along in the middle of two layers of cord, Bead filling radial tip b is reached, and is extended from bead filling axially inner side to downside, the lower edge c of the bead core is bypassed, And then upward winding is until bottom d;The first reinforced rubber sheet radial direction upper end a and tire radial section Breadth Maximum pair The distance H1 for answering an end points is 10mm~25mm;
The bead filling is filled to radial tip b, footpath on the upside of the radial direction peak e of bead core upper limb radial direction It is -10mm~+5mm to top b to the vertical range H2 of bead.
Preferably, the first reinforced rubber sheet footpath downward end d and the bead core radial direction peak e distances H3 For 0~+5mm.
Preferably, first reinforced rubber sheet is designed positioned at the segment thickness of bead filling axially inner side for uniform thickness, numerical value For 1.0~1.2mm, wherein the radial direction upper end a of the first reinforced rubber sheet is diametrically gradually thinning towards top.
Preferably, thickness of first reinforced rubber sheet positioned at bead core winding position designs for uniform thickness, and numerical value is 0.5mm ~0.6mm, wherein the bottom d of the first reinforced rubber sheet is diametrically gradually thinning towards top.
Preferably, each sidewall position is axially external is provided with tire bead protective rubber;Casingply described in the axial direction and The tire bead protective rubber is additionally provided with the second reinforced rubber sheet between the two, and second reinforced rubber sheet is diametrically from radial direction lower end Portion i extends up to radial direction upper end h towards outside.
Preferably, the radial direction lower end i of second reinforced rubber sheet and the bead core radial direction peak e distances H4 For 0~+5mm;
From the corresponding same end of the Breadth Maximum of radial direction upper end h to the tire radial section of second reinforced rubber sheet The radial distance H5 > H1 of point.
Preferably, second reinforced rubber sheet is radially positioned the upper and lower of bead, and its shape is at bead It is gradually thinning to upper end h and bottom i at maximum gauge.
Compared with prior art, the present invention is provided with axially external, bead filling the axially inner side of casingply Specific first reinforced rubber sheet.
In the present invention, first reinforced rubber sheet is located at casing ply overlapping, and due to it, in axle, inwardly outside is respectively provided with Stickiness, is conducive to increasing the shearing force of carcass ply interlayer sizing material thickness, effectively reduction cord interlayer;Increase at casing ply overlapping Bonding intensity, reduction separation risk;The first reinforced rubber sheet has higher hardness in itself simultaneously, is conducive to lifting sidewall position Rigidity, effective supporting carcass.First reinforced rubber sheet is located between casingply and bead filling, because it is inside in axle Outside is respectively provided with the characteristic of stickiness, increase bead filling and casingply bonding intensity, and effectively both reductions are because tire is one Determine the produced separation risk run at high speed under load-up condition;Increase the thickness of bead filling and carcass ply layer sizing, have Effect reduces its shearing force.The first reinforced rubber sheet cladding bead core and bead filling, enhance bead filling and bead core steel Silk combine closely, lifting Tire production when tyre bead portion workability, prevent tire in high temperature vulcanized process bead rubber Flowing is produced, so as to occur the not good phenomenon of tyre evenness.In addition, firm tyre bead be also conducive to it is closely embedding with automobile rim Close, security performance during lifting high load of tire.Therefore, break at the pneumatic tire that the present invention is provided sidewall position in durable traveling It is bad to reduce, with preferable distance travelled, endurance quality and high weight bearing power, and then lift service life.
Further, the axially inner side of the present invention axially external and tire bead protective rubber of the casingply of part on volume Specific second reinforced rubber sheet is additionally provided with, the tyre bead portion of tire can be strengthened, making tire, tyre bead portion is not in durable traveling Destruction is subject to, so that preferably lifting uses mileage.
Brief description of the drawings
Fig. 1 is the structural representation of existing commercial car tire;
Fig. 2 is the structural representation of pneumatic tire provided in an embodiment of the present invention;
Fig. 3 is the width structural representation of pneumatic tire provided in an embodiment of the present invention.
Embodiment
The technical scheme in the embodiment of the present application is clearly and completely described below, it is clear that described embodiment Only a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the application, the common skill in this area The every other embodiment that art personnel are obtained under the premise of creative work is not made, belongs to the model of the application protection Enclose.
This paper terms are explained:
The radial direction of " tire is radially " finger wheel tire.Then claim point A closer to the rotation axis of tire than point B such as fruit dot A Positioned at point B " radially below " (or " diametrically " is located at point B " inner side ").On the contrary, such as fruit dot A than point B further from wheel The rotation axis of tire, then " radially above " (or " diametrically " is located at point B " outside ") for claiming point A to be located at point B.Exist simultaneously When being related to radial distance, equally using the implication.For example:" radially below " is meant to refer to less radius;" radially Top " is meant to refer to larger radius.
" tire radial section " refers to the section presented along the plane of the rotation axis comprising tire.
" tire axial " refers to the direction parallel to tire axis of rotation.As fruit dot A than point B closer to tire midplane, Then claim " axially inner side " (or " in the axial direction " is located at point B " inner side ") that point A is located at point B.On the contrary, such as fruit dot A than point B more Midplane away from tire, then " axially external " (or " in the axial direction " is located at point B " outside ") for claiming point A to be located at point B.Wheel " midplane " of tire refers to the rotation axis and the plane equidistant with the circular bead steel wire of each tyre bead perpendicular to tire.
The invention provides a kind of pneumatic tire, including two bead parts, two bead cores, two sidewalls, crowns and two Layer casingply;
The casingply extends to crown from bead part by sidewall;Each bead part has bead filling;It is special Levy and be, described in the axial direction casingply and the bead filling are provided with the first reinforced rubber sheet, described between the two One reinforced rubber sheet diametrically from the radial direction upper end a between two layers of casing ply overlapping, is extended downwardly along in the middle of two layers of cord, Bead filling radial tip b is reached, and is extended from bead filling axially inner side to downside, the lower edge c of the bead core is bypassed, And then upward winding is until bottom d;The first reinforced rubber sheet radial direction upper end a and tire radial section Breadth Maximum pair The distance H1 for answering an end points is 10~25mm;
The bead filling is filled to radial tip b, footpath on the upside of the radial direction peak e of bead core upper limb radial direction It is -10~+5mm to top b to the vertical range H2 of bead.
The present invention relates to a kind of commercial car (Commercial Vehicle) tire, it has outstanding distance travelled, heavily fortified point Tough wear-resistant and high weight bearing power.
Referring to Fig. 2 and Fig. 3, Fig. 2 is the structural representation of pneumatic tire provided in an embodiment of the present invention, and Fig. 3 is the present invention The width structural representation for the pneumatic tire that embodiment is provided.In Fig. 2,1 is bead part, and 2 be bead core, and 3 fill out for tyre bead Material, 4 be casingply, and 5 be sidewall, and 6 be the first reinforced rubber sheet, and 7 be tire bead protective rubber, and 8 be the second reinforced rubber sheet.
In an embodiment of the present invention, the tire includes:Carcass, two bead parts, two bead cores, two sidewalls, tires Hat and two layers casingply etc..
Pneumatic tire of the embodiment of the present invention includes two bead parts (1), and the tyre bead (portion or position) is designed as and wheel Wheel rim is in contact, and is made up of steel bead wire, bead core, chafer and other parts.Wherein, each bead core (2) is included extremely A few circular bead steel wire.
The tire includes carcass, and the carcass is crossed between a pair of bead portion (1);Bead part is set in tyre width The pair of right and left being spaced apart from each other on direction, and carcass is crossed between bead core (2).The carcass is also known as casing, generally Refer to the force structure for the pneumatic tire that entirety is made up of one or more layers casing ply and tyre bead.Cord makes carcass and whole outer mold The intensity being necessary, layer of cloth glue makes cloth interlayer be closely linked, and prevents friction between cord;Make to pass to impacting for cord To buffering;Bear the automobile shear stress produced in tire when starting, braking and rolling.The effect of carcass is to make wheel mold There is sufficient intensity, so as to bearing load and vibration, and tire is kept certain physical dimension.
Also, each bead part (1) has bead filling (3), the bead filling (3) is radially positioned the tire The top of core (2) is enclosed, and between casingply.
Tire described in the embodiment of the present invention includes two layers of casingply (4), and the casingply passes through from bead part Sidewall extends to crown.In the present invention, the casingply includes many body cords and bypasses the bead core Part diametrically extends to certain height upward on lower edge, and then winding upwards, volume.
The pneumatic tire includes crown, and crown is the critical piece of tire running and ground, is between two tire shoulders Whole position;Crown includes tyre surface (glue), cushion or the belt of the contact of direct and road surface, casing ply (whole internal layer cord It is referred to as carcass) etc..In the present invention, the crown includes tread rubber and crown belt.
The tire of the embodiment of the present invention includes two sidewalls (5), and the sidewall makes tyre bead diametrically extend laterally, and two Individual sidewall and described crown edge or so are engaged.
Pneumatic tire provided in an embodiment of the present invention is provided with the first reinforced rubber sheet (6), and first reinforced rubber sheet (6) exists It is located axially at the casingply and the bead filling between the two, i.e., casingply is axially external, and tyre bead is filled out The axially inner side of material.
In an embodiment of the present invention, first reinforced rubber sheet (6) is diametrically between two layers of casing ply overlapping Radial direction upper end a (as shown in figure 3, the Breadth Maximum of tire radial section is referred to as disconnected width W, corresponding left and right sides W1, W2 two Individual end points), then extended downwardly along in the middle of two layers of cord, reach bead filling (3) radial tip b, and from bead filling (3) axle Inwardly lateral downside extends, and the lower edge c of the bead core (2), and then winding upwards is bypassed, until bottom d.
In an embodiment of the present invention, the radial direction upper end a and W1 of first reinforced rubber sheet (6) distance are H1, H1 are 10~25mm.If H1 < 10mm, tire riding comfort may have a greatly reduced quality;If H1 > 25mm, are pointed to Then lack enough bonding fastness for casingply below disconnected wide end point W1, be unfavorable for reducing the shearing force between curtain yarn, The sidewall rigidity in this region also can be not enough simultaneously.
Meanwhile, the bead filling (3) is filled extremely on the upside of the radial direction peak e of the bead core (2) upper limb radial direction Upper end b (i.e. radial tip b), upper end b to bead (Rim Line) f-g vertical range be H2, H2 be -10~+ 5mm.Wherein, negative sign represent b in bead f-g radially below, positive sign represents b in bead f-g radially above.
In some embodiments of the invention, the first reinforced rubber sheet (6) footpath downward end d and the bead core (2) Radial direction peak e distances H3, H3 distance can be 0~+5mm.Wherein, positive sign represents radial direction peak es of the d in bead core Radially above.
In some embodiments of the invention, first reinforced rubber sheet (6) is located at the portion of bead filling (3) axially inner side Thickness is divided to be designed for uniform thickness, thickness value can be 1.0mm~1.2mm;The radial direction upper end a of wherein the first reinforced rubber sheet (6) exists It is radially gradually thinning towards top.Preferably, first reinforced rubber sheet (6) is located at the thickness at bead core (2) winding position Degree also designs for uniform thickness, and thickness value can be 0.5mm~0.6mm;The bottom d of wherein the first reinforced rubber sheet (6) is diametrically It is gradually thinning towards top.
The present invention is to the specific composition such as tyre stock, cord, bead filling, and specific size such as bead core etc. is without spy Different limitation, it is conventional using this area.In the present invention, the first reinforced rubber sheet main component is natural rubber, suitable Buna, N-550 (fast extruding furnace black), N-660 (general purpose furnace black);According to this area standard ISO 7619, GB/T 531, it glues Degree can be 7.0~7.5 (N), and hardness range can be 61~65 (degree).
In embodiments of the present invention, first reinforced rubber sheet (6) is located at casing ply overlapping, because it is axially inside and outside Side is respectively provided with stickiness, is conducive to increasing the shearing force of carcass ply interlayer sizing material thickness, effectively reduction cord interlayer;Curtain can be increased Bonding intensity at layer of cloth overlapping, reduction separation risk;The first reinforced rubber sheet (6) itself has higher hardness simultaneously, favorably In lifting sidewall position rigidity, effective supporting carcass.
Also, first reinforced rubber sheet (6) is located between casingply (4) and bead filling (3), because it is in axle Inwardly outside is respectively provided with the characteristic of stickiness, can increase bead filling and casingply bonding intensity, and effectively both reductions are because of wheel Tire run at high speed under certain loading condition produced by separation risk;Bead filling and carcass ply layer sizing can be increased Thickness, effectively reduces its shearing force.
Secondly, the first reinforced rubber sheet (6) cladding bead core (2) and bead filling (3), enhance bead filling and tire Circle core wire is combined closely, the workability of tyre bead portion when can lift Tire production, prevents the tire in high temperature vulcanized process Bead rubber produces flowing and occurs the not good phenomenon of tyre evenness.In addition, firm tyre bead is also conducive to and automobile rim It is close chimeric, security performance during the high load of lifting tire.
In an embodiment of the present invention, each sidewall position (5) is axially external is provided with tire bead protective rubber (7).The tire Circle Protection glue has wear-resisting characteristic, is directly contacted with rim for automobile wheel, to protect tire bead position.Prior art is usual Ground, the axially external use tire bead protective rubber in sidewall position and casingply Combination Design.But for the business of frequent high load For car, its tire is easily because tyre bead portion intensity is not enough and produces cracking now in bead (Rim-Line) peripheral region As in durable traveling, the destruction of tyre bead portion is unfavorable for being lifted the service life of tire.
Of the invention to be preferably additionally provided with the second reinforced rubber sheet (8), second reinforced rubber sheet (8) is presented axially in described Casingply (4) and the tire bead protective rubber (7) roll up the axially external and tire of the casingply of upper part between the two, that is, Enclose the axially inner side of Protection glue.In a preferred embodiment of the invention, second reinforced rubber sheet (8) is diametrically downward from footpath End i extends up to radial direction upper end h towards outside.
In some embodiments of the invention, the footpath downward end i of second reinforced rubber sheet (8) and the bead core (3) radial direction peak e distances are H4, and H4 distances can be 0~+5mm.Wherein, positive sign represent i bead core radial direction most High point e is radially above.
In some embodiments of the invention, at from the radial direction upper end h of second reinforced rubber sheet (8) to the disconnected width of maximum End points W1 radial distance is H5, wherein it is preferred that H5 > H1.
In addition, second reinforced rubber sheet (8) can diametrically be located at bead (Rim Line) f-g upper and lower;Its Shape is gradually thinning to upper end h and bottom i at the maximum gauge at bead f-g.
The present invention is also not particularly limited to compositions such as tire bead protective rubbers, conventional using this area, and is used Common process is prepared.In the present invention, the second reinforced rubber sheet main component is natural rubber, butadiene rubber, N- 550;According to this area standard, its viscosity can be 6.5~7.0 (N), and hardness range is 76~80 (degree).
In a preferred embodiment of the invention, second reinforced rubber sheet (8) enhances the tyre bead portion of tire, makes tire In durable traveling, tyre bead portion is not subject to destruction, so that further lifting uses mileage, beneficial to application.
For a further understanding of the application, the pneumatic tire that the application is provided specifically is retouched with reference to embodiment State.
Embodiment 1
As shown in figures 2-3, the tire includes two bead parts 1, two tyre beads to the pneumatic tire structure that the present embodiment is provided Core 2, two sidewalls 5, crown and two layers of casingply 4;The casingply extends to crown from bead part by sidewall; Each bead part 1 has bead filling 3;Each sidewall 1 is axially external is provided with tire bead protective rubber 7;
Described in the axial direction casingply 4 and the bead filling 3 are provided with the first reinforced rubber sheet 6, institute between the two The first reinforced rubber sheet is stated diametrically from the radial direction upper end a between two layers of casing ply overlapping, it is downward along two layers of cord centre Extension, reaches bead filling radial tip b, and extends from bead filling axially inner side to downside, bypasses under the bead core Edge c, and then upward winding is until bottom d;The distance H1 of the radial direction upper end a and W1 of first reinforced rubber sheet 6 is 10mm;The bead filling 3 is filled to radial tip b, footpath on the upside of the radial direction peak e of the upper limb of bead core 2 radial direction It is -4mm to top b to the vertical range H2 of bead.
The footpath downward end d of first reinforced rubber sheet 6 and the bead core 2 radial direction peak e distances H3 is 2mm.The segment thickness that first reinforced rubber sheet 6 is located at the axially inner side of bead filling 3 designs for uniform thickness, numerical value for 1.0~ 1.2mm, wherein the radial direction upper end a of the first reinforced rubber sheet 6 is diametrically gradually thinning towards top.First reinforced rubber sheet 6 thickness for being located at the winding position of bead core 2 design for uniform thickness, and numerical value is 0.5~0.6mm, wherein the lower end of the first reinforced rubber sheet 6 Portion d is diametrically gradually thinning towards top.
Described in the axial direction casingply 4 and the tire bead protective rubber 7 are additionally provided with the second reinforced rubber sheet between the two 8, second reinforced rubber sheet 8 diametrically extends up to radial direction upper end h from footpath downward end i towards outside.Described second The radial direction peak e distances H4 of the radial direction lower end i of reinforced rubber sheet 8 and the bead core 2 is 4mm;From second reinforcement Radial direction upper end h to the W1 of film 8 radial distance H5 > H1, H5 is 20mm.Second reinforced rubber sheet 8 is radially positioned Bead f-g upper and lower, its shape is gradually thinning to upper end h and bottom i at the maximum gauge at bead f-g.
The first reinforced rubber sheet main component is natural rubber, butadiene rubber, N-550, N-660;Its viscosity be 7.0~ 7.5 (N), hardness range is 61~65 (degree).
The second reinforced rubber sheet main component is natural rubber, butadiene rubber, N-550;Its viscosity is 6.5~7.0 (N), hardness range is 76~80 (degree).
Embodiment 2
The present invention chooses the pneumatic tire described in the embodiment 1 of 175/70R14C specifications, carries out indoor endurance quality traveling Experiment.By the tire of embodiment 1 (choose 5 tires) and comparative tire (selection 2, its size, composition are all same as Example 1, Construction is as shown in Figure 1) it is respectively mounted on uniform wheel rim, fill 375kPa pressure and be subject to 518kg load, pass through wheel Tire test drum drives to be rotated under 38 DEG C of environment temperature with 81 kilometers/hour of speed, and load increases to the methods of ETRTO 2017 Stabilization after the 160% of load is advised, stops traveling untill damaging occurs in the tire, records the tire traveling mileage number.
As shown in table 1, result of the test is worth result of the test with an exponential representation, the index on the basis of comparative tire 1 100, index is bigger, represents result better.From table 1 it follows that tire of the embodiment of the present invention can greatly promote durability Energy.
The indoor endurance quality traveling result of the test of the tire of the embodiment of the present invention of table 1 and comparative example tire
Embodiment 3
As shown in figures 2-3, the tire includes two bead parts 1, two tyre beads to the pneumatic tire structure that the present embodiment is provided Core 2, two sidewalls 5, crown and two layers of casingply 4;The casingply extends to crown from bead part by sidewall; Each bead part 1 has bead filling 3;Each sidewall 1 is axially external is provided with tire bead protective rubber 7;
Described in the axial direction casingply 4 and the bead filling 3 are provided with the first reinforced rubber sheet 6, institute between the two The first reinforced rubber sheet is stated diametrically from the radial direction upper end a between two layers of casing ply overlapping, it is downward along two layers of cord centre Extension, reaches bead filling radial tip b, and extends from bead filling axially inner side to downside, bypasses under the bead core Edge c, and then upward winding is until bottom d;The distance H1 of the radial direction upper end a and W1 of first reinforced rubber sheet 6 is 12mm;The bead filling 3 is filled to radial tip b, footpath on the upside of the radial direction peak e of the upper limb of bead core 2 radial direction It is -2mm to top b to the vertical range H2 of bead.
The footpath downward end d of first reinforced rubber sheet 6 and the bead core 2 radial direction peak e distances H3 is 2mm.The segment thickness that first reinforced rubber sheet 6 is located at the axially inner side of bead filling 3 designs for uniform thickness, numerical value for 1.0~ 1.2mm, wherein the radial direction upper end a of the first reinforced rubber sheet 6 is diametrically gradually thinning towards top.First reinforced rubber sheet 6 thickness for being located at the winding position of bead core 2 design for uniform thickness, and numerical value is 0.5~0.6mm, wherein the lower end of the first reinforced rubber sheet 6 Portion d is diametrically gradually thinning towards top.
Described in the axial direction casingply 4 and the tire bead protective rubber 7 are additionally provided with the second reinforced rubber sheet between the two 8, second reinforced rubber sheet 8 diametrically extends up to radial direction upper end h from footpath downward end i towards outside.Described second The radial direction peak e distances H4 of the radial direction lower end i of reinforced rubber sheet 8 and the bead core 2 is 2mm;From second reinforcement Radial direction upper end h to the W1 of film 8 radial distance H5 > H1, H5 is 33mm.Second reinforced rubber sheet 8 is radially positioned Bead f-g upper and lower, its shape is gradually thinning to upper end h and bottom i at the maximum gauge at bead f-g.
The first reinforced rubber sheet main component is natural rubber, butadiene rubber, N-550, N-660;Its viscosity be 7.0~ 7.5 (N), hardness range is 61~65 (degree).
The second reinforced rubber sheet main component is natural rubber, butadiene rubber, N-550;Its viscosity is 6.5~7.0 (N), hardness range is 76~80 (degree).
Embodiment 4
The pneumatic tire described in the embodiment 3 of 215/70R15LT specifications is chosen, indoor endurance quality traveling experiment is carried out. The tire of embodiment 3 (choosing 5 tires) and comparative tire (are chosen 2, its size, composition are all same as Example 3, construction It is respectively mounted as shown in Figure 1) on uniform wheel rim, fills 450kPa pressure and be subject to 772kg load, surveyed by tire Examination drum drives to be rotated under 38 DEG C of environment temperature with 81 kilometers/hour of speed, and load is increased to after the 160% of regulation load It is stable, stop traveling untill damaging occurs in the tire, record the tire traveling mileage number.Result of the test is as shown in table 2, Result of the test is with an exponential representation, index value 100 on the basis of comparative tire 1, and index is bigger, represents result better.From As can be seen that tire of the embodiment of the present invention can greatly promote endurance quality in table 2.
The indoor endurance quality traveling result of the test of the tire of the embodiment of the present invention of table 2 and comparative example tire
Tire Endurance quality
Comparative tire 1 100
Comparative tire 2 114
Embodiment tire 1 203
Embodiment tire 2 205
Embodiment tire 3 210
Embodiment tire 4 201
Embodiment tire 5 205
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should It is considered as protection scope of the present invention.

Claims (7)

1. a kind of pneumatic tire, including two bead parts, two bead cores, two sidewalls, crown and two layers of casingply;
The casingply extends to crown from bead part by sidewall;Each bead part has bead filling;Its feature exists In described in the axial direction casingply and the bead filling are provided with the first reinforced rubber sheet between the two, and described first mends Strong rubber piece diametrically from the radial direction upper end a between two layers of casing ply overlapping, is extended downwardly along in the middle of two layers of cord, is reached Bead filling radial tip b, and extend from bead filling axially inner side to downside, the lower edge c of the bead core is bypassed, and then Upward winding is until bottom d;The first reinforced rubber sheet radial direction upper end a corresponding with the Breadth Maximum of tire radial section one The distance H1 of individual end points is 10~25mm;
The bead filling is filled on the upside of the radial direction peak e of bead core upper limb radial direction to radial tip b, is radially pushed up It is -10~+5mm to hold b to the vertical range H2 of bead.
2. pneumatic tire according to claim 1, it is characterised in that the first reinforced rubber sheet footpath downward end d and institute The radial direction peak e distances H3 for stating bead core is 0~+5mm.
3. pneumatic tire according to claim 2, it is characterised in that first reinforced rubber sheet is located at bead filling axial direction The segment thickness of inner side designs for uniform thickness, and numerical value is 1.0~1.2mm, wherein the radial direction upper end a of the first reinforced rubber sheet is radially On it is gradually thinning towards top.
4. pneumatic tire according to claim 3, it is characterised in that first reinforced rubber sheet is located at bead core winding portion The thickness of position designs for uniform thickness, and numerical value is 0.5~0.6mm, wherein the bottom d of the first reinforced rubber sheet is diametrically towards top It is gradually thinning.
5. the pneumatic tire according to any one of Claims 1 to 4, it is characterised in that each sidewall position is axially external sets It is equipped with tire bead protective rubber;Described in the axial direction casingply and the tire bead protective rubber are additionally provided with the second reinforcement between the two Film, second reinforced rubber sheet diametrically extends up to radial direction upper end h from footpath downward end i towards outside.
6. pneumatic tire according to claim 5, it is characterised in that the radial direction lower end i of second reinforced rubber sheet and institute The radial direction peak e distances H4 for stating bead core is 0~+5mm;
From the corresponding same end points of the Breadth Maximum of radial direction upper end h to the tire radial section of second reinforced rubber sheet Radial distance H5 > H1.
7. pneumatic tire according to claim 6, it is characterised in that second reinforced rubber sheet is radially positioned tyre bead The upper and lower of line, its shape is gradually thinning to upper end h and bottom i at the maximum gauge at bead.
CN201710543454.7A 2017-07-05 2017-07-05 A kind of pneumatic tire Pending CN107244193A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108081878A (en) * 2017-12-18 2018-05-29 安徽佳通乘用子午线轮胎有限公司 A kind of pneumatic tire with double triangle rubbers
CN110722935A (en) * 2019-11-13 2020-01-24 中国化工集团曙光橡胶工业研究设计院有限公司 Radial aircraft tire bead structure resistant to high-speed fatigue
CN111356598A (en) * 2017-12-01 2020-06-30 横滨橡胶株式会社 Pneumatic tire
CN111655517A (en) * 2017-12-01 2020-09-11 横滨橡胶株式会社 Pneumatic tire

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111356598A (en) * 2017-12-01 2020-06-30 横滨橡胶株式会社 Pneumatic tire
CN111655517A (en) * 2017-12-01 2020-09-11 横滨橡胶株式会社 Pneumatic tire
CN108081878A (en) * 2017-12-18 2018-05-29 安徽佳通乘用子午线轮胎有限公司 A kind of pneumatic tire with double triangle rubbers
CN110722935A (en) * 2019-11-13 2020-01-24 中国化工集团曙光橡胶工业研究设计院有限公司 Radial aircraft tire bead structure resistant to high-speed fatigue

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