CN106364261A - Pneumatic tire - Google Patents

Abstract

A pneumatic tire inhibiting defect generation is provided. The tire has a tread the external surface of which forms a tread surface. The tread is engraved with main grooves extending at the circumferential direction. The depth DG of the main grooves is 6 mm or above. The width WG of the main grooves is equal to or greater than the depth DG of the main grooves. The ratio of the width WG of the main grooves to the width of the tread surface is 6% or above. Abrasion indicators are disposed in the main grooves and protrude outward from the bottoms of the main grooves to the radius direction. Thin-film shaped connectors are disposed at the outside of the radius direction of the abrasion indicators. The connectors are connected to the abrasion indicators and side walls of the main grooves.

Description

Pneumatic tire

Technical field

The present invention relates to a kind of pneumatic tire.

Background technology

It is carved with groove on the tyre surface of tire.When the rainy day, this groove contributes to will be present between road surface and tire Water discharge, thus preventing the generation of water surface skidding.

Tyre surface is made up of vulcanite.Tyre surface weares and teares because using.Abrasion will lead to shallower groove.Shallower decorative pattern Ditch then can affect drainage performance.And water surface skidding then may be produced when drainage performance reduces.

Therefore, the degree grasping tire wear is more important.And can arrange in tire to grasp this degree of wear Wear indicator.

Wear indicator is generally disposed in the groove (hereinafter referred to as tap drain) extending in the circumferential.Wear indicator is certainly The bottom of tap drain is outwardly.And wear indicator has height.

After treadwear, wear indicator is eventually made to expose.Continue if reaching the limit of wear to wear and tear, may Drainage performance is made to reduce, the height of wear indicator is matched with the depth of the groove of this limit.Driver can be by really Recognize exposing degree and holding the degree of wear of wear indicator.

The outer surface of tire is by the mold cavity surface molding of mould.Mould in the aforesaid tire with wear indicator In, in order to carve tap drain on tyre surface, mold cavity surface has ridge.In order to arrange wear indicator, the ridge of mould in tap drain There is groove.Ridge has top surface corresponding with the bottom of tap drain.Groove is recessed from this top surface.

In the manufacture of tire, green tire (raw cover) (unvulcanized tire) is put in the mould opened.After input Close mould.Green tire is pressurizeed in a mold and is heated.Mold cavity surface is abutted with green tire.Ridge then embeds in green tire.

In the manufacture of this tire, when ridge embeds green tire, the top surface of this ridge is abutted with green tire.As it was previously stated, it is recessed Groove is recessed from this top surface.Therefore, easy residual air between this groove and green tire.

The residual of air can lead to defect.And in the tire with wear indicator, easily at this wear indicator Produce defect.Defect can damage the outward appearance of wear indicator tire in other words.

The viewpoint of the tire with good appearance is obtained based on the generation suppressing defect, is carrying out various researchs. Japanese Unexamined Patent Publication 2013-180707 publication discloses one of this research example.In tire described in this publication, to mill Damage indicator and be provided with recess.In this way to reduce the volume of wear indicator.

In the manufacture of tire, make rubber that vulcanization reaction to occur by heating.This vulcanization reaction is along with the life of by-product Become.Because most tires is to be manufactured using mould.Therefore, inclining of by-product accumulation is had on the mold cavity surface of mould To.When by-product piles up superfluous, deposit can damage the exterior quality of tire.From the viewpoint of the exterior quality of tire, Mould can be by periodic cleaning.This cleaning is towards mold cavity surface jet grinding material from spray gun, and the abrasive using this injection eliminates The dirt of mold cavity surface.This method for cleaning is referred to as blast cleaning.

Patent documentation 1: Japanese Unexamined Patent Publication 2013-180707 publication

Content of the invention

In the mould for tire described in above-mentioned publication, the mold cavity surface of mould is provided with and refers to for abrasion Show the groove of device.And because of the recess of wear indicator, the bottom of this groove is provided with protuberance.

As it was previously stated, in the cleaning of mould, abrasive injected to mold cavity surface.And aforesaid protuberance is thin and little.Cause This, this cleaning is sometimes by protuberance wear down.When protuberance is by wear down, wear indicator cannot form recess.This tire exists The effect that recess produces possibly cannot be kept in the case of cleaning mould life-time service.And, the suppression that this recess produces lacks Sunken effect is simultaneously insufficient.

In the tire with wear indicator, the generation of defect is not fully and stably suppressed.This tire Among technology for suppressing defect generation is being established.

It is an object of the invention to provide the pneumatic tire that a kind of suppression defect occurs.

The pneumatic tire of the present invention possesses the tyre surface being made up of tread surface its outer surface.Described tyre surface was carved with week Upwardly extending tap drain.The depth of described tap drain is more than 6mm.The depth of the width of described tap drain and described tap drain equal or The width of described tap drain is more than the depth of described tap drain.The width of described tap drain with the ratio of the width of described tread surface is More than 6%.It is provided with wear indicator in described tap drain.Described wear indicator is from the bottom of described tap drain towards radius side Project laterally.It is provided with the connector of film like in described wear indicator.Described connector is located at described abrasion instruction Outside the radial direction of device.Described connector is connected with the side wall of described wear indicator and described tap drain.

Preferably, this airtyred described connector possesses the side being erected between described wear indicator and described side wall Edge.The profile at described edge is circular arc.The radius of curvature of described circular arc is more than 4mm.

Preferably, the thickness of this airtyred described connector is more than 0.3mm below 1.2mm.

Preferably, this airtyred described wear indicator is provided with multiple described connectors, these connectors exist It is arranged at intervals in circumference, described be spaced apart more than 2mm.

Preferably, this airtyred multiple described connector is included for connecting described wear indicator and described tap drain First connector of side side wall and being connected with the second of the opposite side side wall of described tap drain for connecting described wear indicator Body.

Preferably, it is installed on vehicle when this pneumatic tire is configured to this tire, make the end of the side of described tread surface Positioned at the inner side of vehicle when, the number of described second connector is more than the number of described first connector.

Preferably, this pneumatic tire also has enhancement layer inside the radial direction of described tyre surface.Bottom from described tap drain Thickness to described enhancement layer is more than 1.3mm.

Preferably, this airtyred described connector possesses the side being erected between described wear indicator and described side wall Edge.Described edge possesses two planes, and these planes are arranged with respect to described sidewall slope.Near described side wall one Plane is less than another plane and this side wall angulation with this side wall angulation.

Airtyred mould for manufacturing the present invention possesses circular mold cavity surface.Described mold cavity surface has All upwardly extending ridges.Described ridge has from the recessed main groove of its top surface.Described main groove has from entering one in its bottom Walk recessed secondary groove.The bottom of described main groove and the side composition angle of described ridge.Described pair groove is located at described angle.

The airtyred manufacture method of the present invention includes:

(1) prepare the operation of green tire

(2) described green tire is put into the operation of mould

(3) in described mould, described green tire is pressurizeed and the operation that heated

Described mould possesses circular mold cavity surface.Described mold cavity surface has the ridge extending in the circumferential.Described Ridge has from the recessed main groove of its top surface.Described main groove has from its bottom secondary groove recessed further.Described master The bottom of groove and the side composition angle of described ridge.Described pair groove is located at described angle.

In the pneumatic tire of the present invention, the connector for connecting the side wall of wear indicator and tap drain contributes to air Discharge.Suppressed in the residual of this tire hollow gas.The rubber being caused due to the residual because of air is flowed bad the suppression System, thus effectively suppress the generation of defect causing because the flowing of this rubber is bad.The present invention obtains what suppression defect occurred Pneumatic tire.

Brief description

Fig. 1 is the sectional view of the pneumatic tire part representing an embodiment of the invention.

Fig. 2 is the expanded view of the tread surface of tire representing Fig. 1.

Fig. 3 is the schematic diagram of the wear indicator of tire representing Fig. 1.

Fig. 4 be along Fig. 3-sectional view of line.

Fig. 5 is the top view of the mould part representing the tire for manufacturing Fig. 1.

Fig. 6 be along Fig. 5-sectional view of line.

Fig. 7 be along Fig. 5-sectional view of line.

Fig. 8 is to represent the schematic diagram having with the wear indicator of the mode different modes of the wear indicator shown in Fig. 3.

Fig. 9 is the amplification view of a pneumatic tire part for another embodiment.

The explanation of symbol

2 ... tires

4 ... tyre surfaces

6 ... sidewalls

8 ... toe mouths

10 ... tyre beads

12 ... carcasses

14 ... belts

16 ... casing plies

24 ... tread surface

46 ... enhancement layers

48 ... grooves

50 ... tap drains

The edge of 52 ... tap drains

The bottom of 54 ... tap drains

56th, the side wall of 56a, 56b ... tap drain

60 ... wear indicators

The top surface of 62 ... wear indicators

The angle of 64 ... wear indicators

66th, 66a, 66b ... connector

The edge of 68 ... connectors

70 ... moulds

72 ... mold cavity surfaces

74 ... ridges

76 ... top surfaces

The side of 78 ... ridges

82 ... main grooves

84 ... bottoms

The angle of 88 ... main grooves

90 ... secondary grooves

92 ... bottoms

94 ... wear indicators alternatively

102 ... tires

104th, 104a, 104b ... connector

106 ... edges

108th, 108p, 108q ... plane

Specific embodiment

Below, suitably referring to the drawings and the present invention will be described in detail according to preferred implementation.

Fig. 1 represents pneumatic tire 2.In FIG, above-below direction is the radial direction of tire 2, and left and right directions is tire 2 Axially, the circumference being tire 2 with the vertical direction of paper.In FIG, chain-dotted line cl represents the equatoriat plane of tire 2.Except tyre surface flower Beyond stricture of vagina, the shape of this tire 2 is symmetrical with respect to the equatoriat plane.

This tire 2 possesses tyre surface 4, a pair of sidewall 6, a zygodactyl mouth 8, a pair of bead 10, carcass 12, belt 14, cord Layer 16, inner liner 18, a pair of cushion 20 and a pair of bead infantees 22.This tire 2 is tubeless tyre.This tire 2 is installed In passenger car.

Tyre surface 4 is towards convex in radial direction lateral direction.The tread surface 24 that tyre surface 4 formation is contacted with road surface. In other words, the outer surface of tyre surface 4 constitutes tread surface 24.

In FIG, symbol te represents the ad-hoc location on the outer surface of tire 2.This position te is the outer surface of this tire 2 On tyre surface 4 and sidewall 6 between boundary.In the present invention, this position te is the end of tread surface 24.

Tyre surface 4 has tire basic unit 26 and crown layer 28.Crown layer 28 is located at outside the radial direction of tire basic unit 26.Crown layer 28 are laminated in tire basic unit 26.Tire basic unit 26 is made up of the vulcanite with excellent adhesion.The typical matrix of tire basic unit 26 Rubber is natural rubber.Crown layer 28 is made up of the vulcanite with excellent wear, thermostability and creep properties.

Tyre surface 4 is also equipped with a pair of tire wing 30.Each tire wing 30 is located at the tyre surface 4 being made up of crown layer 28 and tire basic unit 26 Between body 32 and sidewall 6.The tire wing 30 is engaged with the body 32 of tyre surface 4 and sidewall 6 respectively.The tire wing 30 is by having good adhesion Property vulcanite constitute.

In FIG, double-head arrow tt is the thickness of tyre surface 4.In the present invention, this thickness tt represents the tyre surface from the equatoriat plane 4 inner surface to its outer surface (tread surface 24) length.Additionally, when tap drain described later is arranged at equator (Fig. 1 of tire 2 The tread surface 24 shown in symbol eq on position) upper when, by near the equatoriat plane and there is no the tire that the position of tap drain measures The thickness in face 4 is as thickness tt.

In this tire 2, based on the viewpoint playing its performance, the preferably thickness tt of tyre surface 4 is 7.3mm.Based on suppression relatively The big impact to quality and rolling resistance for the thickness tt, preferably this thickness tt is below 11mm.Based on the heating suppressing tyre surface 4 Improve the viewpoint of high speed durability further, preferably this thickness tt is below 10mm, being more highly preferred to this thickness tt is below 9mm, Preferred this thickness tt is below 8mm.

Each sidewall 6 extends from tyre surface 4 to radial direction substantially inner side.This sidewall 6 by have excellent belt cutting-resisting property with And the vulcanite of ageing resistace is constituted.This sidewall 6 prevents the damage of carcass 12.

Each toe mouth 8 is located at the radial direction substantially inner side on sidewall 6.Toe mouth 8 is presented axially in tyre bead 10 and carcass 12 Outside.Toe mouth 8 is made up of the vulcanite with good wear performance.Although not shown, toe mouth 8 is supported with the flange of wheel rim Connect.

Each tyre bead 10 is located at the axially inner side of toe mouth 8.Tyre bead 10 possesses bead core 34 and from this bead core 34 towards partly The triangle rubber 36 extending outside the direction of footpath.Bead core 34 is ring-type, and includes the steel wire of the inductility of winding.The typical case of steel wire Material is steel.Triangle rubber 36 is towards the tip outside radial direction.Triangle rubber 36 is made up of the vulcanite of high rigidity.

Carcass 12 is made up of the first plies 38 and the second plies 40.First plies 38 and the second plies 40 are set up in both sides Between tyre bead 10, and along tyre bead 4 and sidewall 6.First plies 38 and the second plies 40 are respectively around bead core 34 from axially Turn back towards outside in inner side.

Although not shown, the first plies 38 and the second plies 40 are respectively by multiple cords arranged side by side and rubberizing rubber (topping rubber) is constituted.Each cord is 75 ° to 90 ° with the absolute value of equatoriat plane angulation.In other words, this tire Body 12 has radial construction.Cord is made up of organic fiber.Preferably organic fiber is polyester fiber, nylon fiber, artificial fibre Dimension, dacron fibre, aramid fibre.Carcass 12 can also be formed by one piece of plies.

Belt 14 is located inside the radial direction of tyre surface 4.Belt 14 is laminated with carcass 12.Belt 14 is to carcass 12 Strengthened.Belt 14 includes la m 42 and outer layer 44.As shown in figure 1, in the axial direction, the width of la m 42 is somewhat Width more than outer layer 44.Although not shown, la m 42 and outer layer 44 include multiple cords arranged side by side and rubberizing respectively Rubber (topping rubber).Each cord tilts with respect to the equatoriat plane.The general absolute value at angle of inclination is more than 10 ° Less than 35 °.The cord of la m 42 with respect to the equatoriat plane incline direction with outer layer 44 cord inclining with respect to the equatoriat plane Tilted direction is contrary.The preferred material of cord is steel.Organic fiber can also be used for cord.Preferably belt 14 is axially wide Spend the Breadth Maximum for tire 2 more than 0.7 times.Belt 14 can also possess more than 3 layers.

Casing ply 16 is located at outside the radial direction of belt 14.In the axial direction, the width of casing ply 16 is more than belt 14 width.Although not shown, this casing ply 16 includes cord and rubberizing rubber.Cord is wound in helical form.This cord Layer 16 has so-called non junction structure.Cord actually extends in the circumferential.Cord is less than 5 ° with the angle of circumference, and then For less than 2 °.Because belt 14 is fettered so that the protuberance of belt 14 is suppressed by this cord.Cord is by organic fiber structure Become.Preferably organic fiber is nylon fiber, polyester fiber, staple fibre, dacron fibre, aromatic polyamides Fiber.

Belt 14 and casing ply 16 constitute enhancement layer 46.Enhancement layer 46 is located inside the radial direction of tyre surface 4.Change speech It, this tire 2 possesses the enhancement layer 46 inside the radial direction of tyre surface 4.In this tire 2, enhancement layer 46 also can only by Belt 14 is constituted.Enhancement layer 46 also can be only made up of casing ply 16.

Inner liner 18 is located at the inner side of carcass 12.Inner liner 18 is engaged with the inner surface of carcass 12.Inner liner 18 is by having Excellent bubble-tight vulcanite is constituted.The typical material of inner liner 18 is butyl rubber or halogenated butyl rubber.Inner liner 18 keep the intrinsic pressure of tires 2.

Each cushion 20 is laminated with carcass 12 near the end of belt 14.Cushion 20 is made up of soft rubber. Cushion 20 absorbs the stress of the end of belt 14.This cushion 20 suppression belt 14 swells.

Chafer 22 is located at the vicinity of tyre bead 10 respectively.When tire 2 is loaded on wheel rim, this chafer 22 and wheel Rim abuts.This abutting makes the vicinity of tyre bead 10 be protected.In the present embodiment, chafer 22 by cloth and impregnated in this The rubber of cloth is constituted.This chafer 22 can be made up of the material identical material with toe mouth 8.Now, chafer 22 with Toe mouth 8 is integral.

Fig. 2 represents a part for the tread surface 24 of this tire 2.Above-below direction in this Fig. 2 is the circumference of tire 2, left Right direction is the axial direction of tire 2, and the direction vertical with paper is the radial direction of tire 2.

Multiple grooves 48 are carved with the tyre surface 4 of this tire 2.These grooves 48 form tread contour.Tread surface The part beyond groove 48 in 24 is also referred to as tire ground (land)

As shown in Fig. 2 the region z1 (hereinafter referred to as of one end te1 (hereinafter referred to as first end) from the equatoriat plane to tyre surface 4 One region) in tread contour and other end te2 (the hereinafter referred to as second end) from this equatoriat plane to tyre surface 4 region z2 (with Be referred to as down second area) in tread contour different.The tread contour of this tire 2 is asymmetric with respect to the equatoriat plane.This tyre surface is spent Stricture of vagina is asymmetric with respect to the equatoriat plane.When this tire 2 is installed on vehicle, first end te1 of tread surface 24 is located at vehicle Inner side, the second end te2 of this tread surface 24 is located at the outside of this vehicle.

In this tire 2, the multiple grooves 48 constituting tread contour include the continuous multiple tap drains extending in the circumferential 50.In other words, the continuous multiple tap drains 50 extending in the circumferential are carved with the tyre surface 4 of this tire 2.On the tyre surface 4 of this tire 2 It is carved with three tap drains 50.In Fig. 2 of this specification, tap drain 50a positioned at the rightmost side is also referred to as the first tap drain, positioned at this first The tap drain 50b in the left side of tap drain 50a be also referred to as the second tap drain, positioned at this second tap drain 50b more left side tap drain 50c also by Referred to as the 3rd tap drain.

In this tire 2, tap drain 50 that the number of the tap drain 50 that first area z1 comprises comprises more than second area z2 Number.This is because formation ground plane, so that when tire 2 is kept straight on, the contact area in the first area z1 of vehicle interior side is big Contact area in the second area z2 of vehicle outside.

In fig. 2, double-head arrow wt is the width of tread surface 24.This width wt represents the first end from tread surface 24 The length of te1 to its second end te2.Double-head arrow wg is the width of tap drain 50.This width wg represents the side of the side from tap drain 50 Edge 52 to the edge 52 of opposite side length.

In this tire 2, the ratio of the width wg of the tap drain 50 and width wt of tread surface 24 is more than 6%.By this The mode of kind makes tap drain 50 guarantee enough width wg.The tap drain 50 of this tire 2 contributes to draining.So that this tire 2 reaches Become good drainage performance.The width wg of tap drain 50 affects the contact area of tread surface 24.It is based on and substantially ensure that this ground plane Long-pending viewpoint, preferably this ratio are less than 15%.

Fig. 3 represents a part of the first tap drain 50a in Fig. 2.Above-below direction in this Fig. 3 is the circumference of tire 2, left and right Direction is the axial direction of tire 2, and the direction vertical with paper is the radial direction of tire 2.Fig. 4 represent along Fig. 3-the cuing open of line Face.Above-below direction in this Fig. 4 is the radial direction of tire 2, and left and right directions is the axial direction of tire 2, the direction vertical with paper Circumference for tire 2.

Tap drain 50 possesses bottom 54 and a pair of sidewalls 56.Each side wall 56 prolongs from bottom 54 to radial direction substantially outside Stretch.Side wall 56 constitutes angle 58 with bottom 54.In other words, between side wall 56 and bottom 54 it is angle 58.As shown in figure 4, side wall 56 with Angle 58 between bottom 54, that is, the angle 58 of tap drain 50 be set to circle.In the diagram, arrow ra is the radius of curvature at this angle 58. In this tire 2, represent that radius of curvature ra of the circular arc at this angle 58 is more than 1mm below 4mm.

In the diagram, double-head arrow dg is the depth of tap drain 50.This depth dg represents the bottom from tread surface 24 to tap drain 50 54 length.When bottom 54 unevenness, this depth dg represents depth capacity.In the diagram, double-head arrow tg represents from tap drain 50 Bottom 54 to enhancement layer 46 thickness.This thickness tg is also referred to as groove bottom thickness.When bottom 54 unevenness of tap drain 50, This thickness tg represents minimum thickness.

Depth dg of the tap drain 50 of this tire 2 is more than 6mm.Tap drain 50 is made to guarantee enough depth in this way dg.The tap drain 50 of this tire 2 contributes to drainage performance.So that good drainage performance reached by this tire 2.Based on this sight Point, preferably this depth dg are more than 6.0mm, more preferably more than 7.0mm.

As it was previously stated, enhancement layer 46 is located inside the radial direction of tread surface 4.When tap drain 50 adopts larger depth dg When, the bottom 54 of tap drain 50 may rupture and so that this enhancement layer 46 exposes.In this tire 2, preferred thickness tg is set as 1.3mm more than.In this way, suitably guarantee the thickness from the bottom 54 of tap drain 50 to enhancement layer 46, thus preventing this The exposing of enhancement layer 46.Based on this viewpoint, in this tire 2 it is considered to the thickness of tyre surface 4 and suitably adjust the depth of tap drain 50 Dg is such that it is able to guarantee that thickness tg is more than 1.3mm.Due to depth dg of tap drain 50 be consider thickness tg after determine, because This does not set the preferred upper limit of depth dg of this tap drain 50.

In tire 2, equal with depth dg of this tap drain 50 or this tap drain 50 the width wg of the width wg of tap drain 50 is big Depth dg in this tap drain 50.In this tire 2, even if using the tyre surface 4 with relatively small thickness tt, this tap drain 50 is also effectively Contribute to drainage performance.This tire 2 not only maintains good drainage performance, and reaches the raising further of high speed durability. Based on this viewpoint, the preferably width wg of tap drain 50 is more than depth dg of this tap drain 50.In more detail, be more highly preferred to width wg with The ratio of depth dg is more than 1.1, and preferred is more than 1.2.Based on the viewpoint of the suppression impact to contact area for the tap drain 50, Preferably this ratio is less than 2.0, more preferably less than 1.8.

It is provided with wear indicator 60 (wear indicator) in the tap drain 50 of this tire 2, in a tap drain 50 It is usually provided with multiple wear indicators 60.These wear indicators 60 are arranged at intervals in the circumferential.This interval is according to wheel The specification of tire 2 and suitably determine.

Wear indicator 60 is protruding outside towards radial direction from the bottom 54 of tap drain 50.In other words, wear indicator 60 It is to be made up of the part protuberance of the bottom 54 of tap drain 50.As shown in figure 4, wear indicator 60 is erected at the one of tap drain 50 Between side side wall 56 and opposite side side wall 56.The top surface 62 of the wear indicator 60 of this tire 2 is flat.This top surface 62 and tap drain 50 bottom 54 is almost parallel.This top surface 62 and side wall 56 constitute angle 64.In other words, between top surface 62 and side wall 56 it is angle 64,. As shown in figure 4, the angle 64 between top surface 62 and side wall 56, that is, the angle 64 of wear indicator 60 is set to circle.In the diagram, Arrow rb is the radius of curvature at this angle 64.In this tire 2, for represent this angle 64 circular arc radius of curvature rb be 1mm with Upper below 4mm.

In the diagram, two arrow hw are the height of wear indicator 60.This height hw represent from the bottom 54 of tap drain 50 to The height of the top surface 62 of wear indicator 60.When bottom 54 unevenness of tap drain 50, this height hw represents maximum height.

As it was previously stated, tyre surface 4 is made up of vulcanite.Tyre surface 4 weares and teares because using.Abrasion leads to tap drain 50 to shoal.Relatively Shallow tap drain 50 can affect drainage performance.When drainage performance reduces, then may produce water surface skidding.

In this tire 2, the top surface 62 of wear indicator 60 is located at and leans on inside radial direction than tread surface 24.Work as tyre surface After 4 abrasions, the top surface 62 of this wear indicator 60 finally can expose the surface of tire 2.In this tire 2, wear indicator 60 Height hw make it with groove 48, the depth that is specially tap drain 50 and reaches the limit of wear matches, after reaching the limit of wear Abrasion continues then to make drainage performance reduce.Driver can be by confirming exposing degree and holding abrasion of wear indicator 60 Degree.In common tire 2, this height hw is set at 1.5mm to 2.0mm scope.In this tire 2, wear indicator 60 height hw is 1.7mm.

The connector 66 of film like, in this tire 2, is provided with wear indicator 60.Specifically, in this tire 2 Wear indicator 60 on be provided with four connectors 66.As shown in figure 4, these connectors 66 are located at the half of wear indicator 60 Outside the direction of footpath.Each connector 66 is connected with the side wall 56 of wear indicator 60 and tap drain 50.

Connector 66 possesses the edge 68 being erected between side wall 56 and wear indicator 60.The profile at this edge 68 is partly Footpath side is convex upwardly toward inner side.In this tire 2, the profile at edge 68 is circular arc.

In this tire 2, multiple connectors 66 are provided with wear indicator 60.In tire 2 shown in Fig. 1-4, Four connectors 66 are provided with one wear indicator 60.In these connectors 66, two connector 66a are indicated with abrasion Device 60 connects.And this two connector 66a and side wall 56a positioned at the first end te1 side of tread surface 24 is (hereinafter referred to as The first side wall) connect.Two other connector 66b is connected with wear indicator 60.And remaining two connector 66b also with Side wall 56b (hereinafter referred to as second sidewall) positioned at the second end te2 side of tread surface 24 connects.Additionally, by the present invention The connector 66a positioned at the first side wall 56a side be referred to as the first connector, by the connector positioned at second sidewall 56b side 66b is referred to as the second connector.

In this tire 2, the multiple connectors 66 being arranged on a wear indicator 60 include multiple first connectors 66a and multiple second connector 66b.As shown in figure 3, these first connectors 66a is arranged at intervals in the circumferential.These Two connector 66b are arranged at intervals in the circumferential.It is arranged on the number of the first connector 66a on a wear indicator 60 And second the number of connector 66b suitably determined according to the size of the wear indicator 60 being arranged at tire 2.

In figure 3, double-head arrow d1 represents a first connector 66a and is located at this first connector in the circumferential Interval between another first connector 66a on 66a side.In this tire 2, based on being easily formed the first connector 66a's Viewpoint, preferably this interval d1 are more than 2mm.Further, since this interval d1 is by the size of wear indicator 60 and to be arranged on The number of the first connector 66a on this wear indicator 60 determines, the preferred upper limit of this interval d1 has no special setting.

In figure 3, double-head arrow d2 represents a second connector 66b and is located at this second connector in the circumferential Interval between another second connector 66b on 66b side.In this tire 2, based on being easily formed the second connector 66b's Viewpoint, preferably this interval d2 are more than 2mm.Further, since this interval d2 is by the size of wear indicator 60 and to be arranged on The number of the second connector 66b on this wear indicator 60 determines, the preferred upper limit of this interval d2 has no special setting.

In the diagram, symbol p1a is the boundary between the edge 68 of the first connector 66a and the first side wall 56a.Symbol p1b Boundary between edge 68 for this first connector 66a and the top surface 62 of wear indicator 60.

In this tire 2, the edge 68 of the first connector 66a is connected with the first side wall 56a at boundary p1a.This first The edge 68 of connector 66a is connected with the top surface 62 of wear indicator 60 at boundary p1b.For representing this first connector The center of the circular arc of the profile at edge 68 of 66a is set to, and the edge 68 of this first connector 66a is at boundary p1a It is connected with the first side wall 56a, be connected with the top surface 62 of wear indicator 60 at boundary p1b.

In the diagram, symbol p2a is the boundary between the edge 68 of the second connector 66b and second sidewall 56b.Symbol p2b Boundary between edge 68 for this second connector 66b and the top surface 62 of wear indicator 60.

In this tire 2, the edge 68 of the second connector 66b is connected with second sidewall 56b at boundary p2a.This second The edge 68 of connector 66b is connected with the top surface 62 of wear indicator 60 at boundary p2b.For representing this second connector The center of the circular arc of the profile at edge 68 of 66b is set to, and the edge 68 of this second connector 66b is at boundary p2a It is connected with second sidewall 56b, be connected with the top surface 62 of wear indicator 60 at boundary p2b.

In the present invention, if no special instructions, the size of each part of tire 2 and angle are just to be assembled in tire 2 On gauge wheel rim, and air is fills up in tire 2, make tire 2 become regular intrinsic pressure in the state of be measured.During mensure, Do not apply load to tire 2.In this specification, so-called regular wheel rim refers to the wheel rim of the specification defined by tire 2 foundation. " design rim " in " standard rim " in jatma specification, the tra specification and " measuring in etrto specification Rim " is regular wheel rim.In this specification so-called regular intrinsic pressure refer to by the specification defined of tire 2 foundation intrinsic pressure. " tire load limits at various cold in " highest air pressure " in jatma specification, tra specification " inflation pressure " in " maximum " described in inflation pressures " and etrto specification is just Rule are intrinsic pressure.The size of riding tire for vehicles 2 and angle intrinsic pressure for 180kpa in the state of be measured.

Tire 2 described above manufactures in the following manner.In the manufacture of this tire 2, by inner liner 18, carcass 12nd, after multiple rubber components of tyre bead 10 etc. are assembled, prepare green tire (unvulcanized tire 2).This green tire is put to mould In.Mould possesses circular mold cavity surface.This mold cavity surface forms the outer surface of tire 2.The outer surface of green tire and this die cavity Surface abuts.The inner surface of green tire is abutted with capsule or core.Green tire is pressurized in a mold and heats.Pressurization and heating make life The rubber composition flowing of tire.Heating makes rubber vulcanization reaction occur, thus obtaining tire 2.The manufacture method bag of this tire 2 Include: (1) prepares the operation of green tire, green tire is put into the operation of mould by (2), (3) are pressurizeed to green tire in mould and added The operation of heat.

Fig. 5 represents a part for the mold cavity surface 72 for manufacturing the mould 70 that this tire 2 is used.In Figure 5, up and down Direction is equivalent to the circumference of tire 2, and left and right directions is equivalent to the axial direction of tire 2, is equivalent to tire 2 with the vertical direction of paper Radial direction.The part of the mould 70 shown in this Fig. 5 forms the part of the wear indicator 60 shown in Fig. 3.Additionally, this Fig. 5 Paper front is equivalent to inside the radial direction of tire 2, and the reverse side of this paper is equivalent to outside the radial direction of tire 2.

Fig. 6 represent along Fig. 5-section of the mould 70 of line.Fig. 7 represent along Fig. 5-the cuing open of the mould 70 of line Face.In figure 6, above-below direction is equivalent to the radial direction of tire 2, and left and right directions is equivalent to the axial direction of tire 2, with hanging down of paper Nogata is to the circumference being equivalent to tire 2.In the figure 7, above-below direction is equivalent to the circumference of tire 2, and left and right directions is equivalent to tire 2 Radial direction, be equivalent to the axial direction of tire 2 with the vertical direction of paper.

In this mould 70, mold cavity surface 72 possesses ridge 74.This ridge 74 extends in the circumferential.This ridge 74 is towards partly Prominent inside the direction of footpath.This ridge 74 possesses top surface 76 and a pair of side 78.Each side 78 is from top surface 76 towards radial direction Substantially outside extends.Specifically, side 78 tilts with respect to radial direction.Angle of inclination (the angle shown in Fig. 6 of this side 78 Degree α 1 and angle [alpha] 2) absolute value be generally set to 5 ° to 25 ° of scope.In this mould 70, top surface 76 and side 78 structure Angulation 80.As shown in fig. 6, angle 80 between top surface 76 and side 78, the i.e. angle 80 of ridge 74 are set to circle.Ridge 74 shape Become the tap drain 50 of tire 2.Top surface 76 forms the bottom 54 of tap drain 50.Side 78 forms the side wall 56 of tap drain 50.

Ridge 74 is also equipped with main groove 82.Main groove 82 is recessed towards outside radius from the top surface 76 of ridge 74.Main groove 82 possess bottom 84 and a pair of inclined-plane 86.Each inclined-plane 86 extends from bottom 84 towards the top surface 76 of ridge 74.Inclined-plane 86 is relatively Tilt in radial direction.The absolute value at the angle of inclination (angle beta 1 shown in Fig. 7 and angle beta 2) on this inclined-plane 86 is normally set up In 50 ° to 70 ° of scope.The bottom 84 of this main groove 82 constitutes angle 88 with the side 78 of ridge 74.As shown in fig. 6, main groove Angle 88 between 82 bottom 84 and the side 78 of ridge 74, the i.e. angle 88 of main groove 82 are set to circle.In this mould 70 In, main groove 82 forms the wear indicator 60 of tire 2.

Main groove 82 is also equipped with secondary groove 90.The bottom 84 of the autonomous groove 82 of secondary groove 90 further towards radial direction outside Side is recessed.This secondary groove 90 forms the connector 66 of wear indicator 60.This secondary groove 90 has for forming this connector 66 Edge 68 bottom 92.As it was previously stated, the profile arc representation at the edge 68 of connector 66.Therefore, this secondary groove 90 Arc representation is also used in bottom 92.

As it was previously stated, in the manufacture of tire 2, in the mould 70 that green tire is put to, and being pressurizeed within mold 70 And heating.Now, the mold cavity surface 72 of mould 70 is abutted with green tire.The ridge 74 of mold cavity surface 72 then embeds in green tire.

In the manufacture of this tire 2, when ridge 74 embeds green tire, the top surface 76 of this ridge 74 is abutted with green tire.Normal In the mould of rule, this abutting makes the main groove of ridge be closed by green tire.But in the mould 70 of the present invention, as it was previously stated, main Groove 82 possesses secondary groove 90.This secondary groove 90 is located at the angle being made up of the bottom 84 of main groove 82 and the side 78 of ridge 74 88.In other words, this secondary groove 90 is located at the angle 88 between the bottom 84 of main groove 82 and the side 78 of ridge 74.And, it is secondary Groove 90 is located at the position in the outside than main groove 82 pattern tool 70.Therefore, the space between this main groove 82 and green tire is sealed Close when confidential somewhat later than conventional mould.The air being in above-mentioned space can be discharged to the outer of mould 70 by secondary groove 90 Side.In this mould 70, the air being in this space is sufficiently displaced from by rubber.In this mould 70 so that air residual and The rubber flowing causing bad is suppressed.As it was previously stated, secondary groove 90 forms the connector 66 of wear indicator 60.I.e., originally The connector 66 of tire 2 contributes to the discharge of air.Therefore this tire 2 suppresses the residual of air.Due to the residual because of air The rubber flowing causing is bad suppressed, thus restrained effectively the generation of the defect causing because the flowing of this rubber is bad. The present invention obtains the pneumatic tire 2 inhibiting defect to occur.

As it was previously stated, in this tire 2, depth dg of tap drain 50 is more than 6mm.The width wg of tap drain 50 and this tap drain 50 Equal or this tap drain 50 the width wg of depth dg be more than depth dg of this tap drain 50.And, the width wg of tap drain 50 and tire The ratio of the width wt on face surface 24 is more than 6%.The tap drain 50 of this tire 2 has the width of the tap drain width more than conventional tire Degree wg.The tap drain 50 with larger width wg can lead to larger wear indicator 60.Therefore, in the mould 70 of this tire 2, For wear indicator 60 main groove 82 be more than conventional tire mould main groove.Larger main groove 82 is then unfavorable for sky Gas is discharged.But as it was previously stated, in this mould 70, main groove 82 is additionally provided with secondary groove 90.Therefore, although tap drain 50 is adopted With larger width wg, but air is fully discharged.This tire 2 inhibits the residual of air.Due to causing because of air residual Rubber flowing bad suppressed, thus restrained effectively the generation of defect causing because of air residual.The present invention's Connector 66 effectively further plays a role in tap drain 50 is using the tire 2 of larger width wg.Even if tap drain 50 adopts Larger width wg, but because the generation of defect is suppressed, the tyre surface 4 with relatively small thickness therefore can be adopted such that it is able to enter One step improves high speed durability.

As it was previously stated, in this tire 2, connector 66 suppresses the generation of defect effectively.Therefore, for manufacturing epicycle It is not necessary in order to prevent defect from arranging pore (vent hole) in the mould 70 of tire 2.Due to not needing to arrange this discharge Device, after therefore can obtaining tire 2 in the state of not forming flash (spew), also without dimension in the cleaning of mould 70 Shield discharger.This tire 2 also contributes to improve productivity ratio.

In this tire 2, to the profile at the edge 68 of connector 66, there is no particular restriction.But tire 2 is stably formed tool After having the connector 66 at edge 68 of arc-shaped, contribute to effectively directing the air to the outside of mould 70.Based on this viewpoint, excellent The profile selecting the edge 68 of this connector 66 is circular arc.

As it was previously stated, in this tire 2, connector 66 is connected with the side wall 56 of wear indicator 60 and tap drain 50.Should The action of connector 66 constrained side wall 56.In the tire 2 of transport condition, this connector 66 suppresses the metamorphosis of tap drain 50. Because the change of drainage performance is less, this tire 2 stably keeps good drainage performance.Metamorphosis due to ground plane It is suppressed, the performance change of therefore control stability etc. is also less.This tire 2 is good and stably keeps control stability etc. Performance.

As it was previously stated, this tire 2 is configured to, it is installed on this vehicle, make first end te1 of tyre surface 24 be located at the interior of vehicle Side.On the tyre surface 4 of this tire 2, power is in the side towards its second end te2 for easy first end te1 from this tread surface 24 Tendency to effect.Based on being stably formed ground plane and viewpoint that is good and stably keeping control stability, it is preferably provided with The number of the second connector 66b in the second end te2 side is more than the first connector 66a's being arranged on first end te1 side Number.More specifically, the difference of the number of the number of the preferably second connector 66b and the first connector 66a is more than 1, more It is preferably more than 2.Based on the easy viewpoint forming connector 66, preferably this difference is less than 5, more preferably less than 4.Fig. 8 table Be shown as the other modes of wear indicator 60 by the number of the first connector 66a be set as 1 and by the second connector 66b Number is set as 2 wear indicator 94.

In figure 3, double-head arrow t1 represents the thickness of the first connector 66a.Double-head arrow t2 represents the thickness of the second connector 66b Degree.

In this tire 2, preferred thickness t1 is more than 0.3mm below 1.2mm.This thickness t1 is set as more than 0.3mm The first connector 66a is made to contribute effectively to the discharge of air and limit the first side wall 56a.Based on this viewpoint, it is more highly preferred to This thickness t1 is more than 0.4mm.This thickness t1 is set as below 1.2mm, forms the first connector with being not only able to zero defect 66a, and inhibit the impact to quality for this first connector 66a.Based on this viewpoint, being more highly preferred to this thickness t1 is 1.1mm Below.

In this tire 2, preferred thickness t2 is more than 0.3mm below 1.2mm.This thickness t2 is set as more than 0.3mm The second connector 66b is made to contribute effectively to the discharge of air and limit second sidewall 56b.Based on this viewpoint, it is more highly preferred to This thickness t2 is more than 0.4mm.This thickness t2 is set as below 1.2mm, forms the second connector with being not only able to zero defect 66b, and inhibit the impact to quality for this second connector 66b.Based on this viewpoint, being more highly preferred to this thickness t2 is 1.1mm Below.

In the diagram, arrow rc1 is the radius of curvature of the circular arc of profile at the edge 68 for representing the first connector 66a. Arrow rc2 is the radius of curvature of the circular arc of profile at the edge 68 for representing the second connector 66b.

In this tire 2, preferred curvature radius rc1 is more than 4mm.In this way, effectively make the first connector 66a contributes to the discharge of air and limits the first side wall 56a.Based on this viewpoint, be more highly preferred to radius of curvature rc1 be 5mm with On.Larger radius of curvature rc1 then can lead to the first larger connector 66a.And the first larger connector 66a not only can not So that rubber filling is arrived secondary groove 90 and defect may be produced, and this first connector 66a can affect quality.Being based on should Viewpoint, preferably this radius of curvature rc1 are below 10mm, more preferably below 9mm.

In this tire 2, preferred curvature radius rc2 is more than 4mm.In this way, effectively make the second connector 66b contributes to the discharge of air and limits second sidewall 56b.Based on this viewpoint, be more highly preferred to radius of curvature rc2 be 5mm with On.Larger radius of curvature rc2 then can lead to the second larger connector 66b.And the second larger connector 66b not only can not So that rubber filling is arrived secondary groove 90 and defect may be produced, and this second connector 66b can affect quality.Being based on should Viewpoint, preferably this radius of curvature rc2 are below 10mm, more preferably below 9mm.

As it was previously stated, in the manufacture of this tire 2, preparing green tire (unvulcanized wheel after multiple rubber components are assembled Tire 2).In the preparatory process of this green tire, sometimes the rubber composition of the tyre surface 4 as rubber components is extruded and form tire Face 4.Now, the shape of the mouth gold of extruder is corresponding with the section shape of tyre surface 4.Although not shown, by this extrusion It is formed with recess corresponding with tap drain 50 in the section shape of tyre surface 4 being formed.And, the width of the bottom of this recess is set It is the width of the bottom 54 less than tap drain 50.As shown in figure 4, the bottom 54 of tap drain 50 is general planar.Therefore, usual this recess Bottom be also machined to flat.

As it was previously stated, the present invention restrained effectively the generation of defect by setting connector 66 in tire 2.It is based on The discharge of air is promoted effectively further to suppress the viewpoint of the generation of this defect it is also possible to bottom in described recess further Portion's setting has the projection of the height of 0.3mm～0.6mm.And, the section shape of this projection can also be triangle.By this The mode of kind, due to further inhibiting the rubber flowing causing because of air residual bad, thus more effectively suppress Because this rubber flows the generation of the bad defect causing.

Fig. 9 represents a part for the pneumatic tire 102 of another embodiment of the present invention.This Fig. 9 is corresponding with aforementioned Fig. 4 Figure.In this Fig. 9, above-below direction is the radial direction of this tire 102, and left and right directions is the axial direction of this tire 102, with paper Vertical direction is the circumference of this tire 102.

In addition to connector described later, this tire 102 has the structure same with the tire 2 shown in Fig. 1.Therefore, in Fig. 9 In, the part identical part with the tire 2 of Fig. 1 is paid with identical symbol and description is omitted.

The wear indicator 60 of this tire 102 is provided with the film like connector 104 same with the tire 2 shown in Fig. 1. This connector 104 links side wall 56 and this wear indicator 60 of tap drain 50.This connector 104 possesses and is erected at side wall 56 and mill Damage the edge 106 between indicator 60.The profile at this edge 106 is convex towards inner side in the radial direction.Additionally, as Fig. 9 Shown, the profile of the top surface 62 of side wall 56 and wear indicator 60 is straight line.Side wall 56 and top surface 62 are made up of plane.Additionally, Tap drain 50 possesses this side wall 56 and bottom 54.It is angle 58 between this side wall 56 and bottom 54.The profile at angle 58 is circular arc, this circular arc Radius of curvature ra be more than 1mm below 4mm.And, it is angle 64 between side wall 56 and top surface 62.The profile at this angle 64 is circle Arc, radius of curvature rb of this circular arc is more than 1mm below 4mm.

In this tire 102, the edge 106 of connector 104 possesses two planes 108.In other words, this connector 104 The profile at edge 106 includes two piece straight lines corresponding with this two planes 108 respectively.These planes 108 with respect to side wall 56 or Person's top surface 62 tilts.Plane 108p (the hereinafter referred to as first plane) by proximal wall 56 and this side wall 56 angulation are less than another Plane 108q (the hereinafter referred to as second plane) and this side wall 56 angulation.Or the first plane 108p and 62 angulations of top surface Degree is more than the second plane 108q and this top surface 62 angulation.

In this tire 102, the first plane 108p is joined directly together with the second plane 108q.Can also be in the first plane 108p Rounding and the second plane 108q between.Other planes can also be set between the first plane 108p and the second plane 108q.? In this tire 102, side wall 56 is joined directly together with the first plane 108p.It is also possible to flat with first in side wall 56 in this tire 102 Rounding between the 108p of face.Between side wall 56 and the first plane 108p, in addition other planes can also be set.In this tire 102 In, the second plane 108q is joined directly together with top surface 62.Can also between the second plane 108q and top surface 62 rounding.Can also be In addition other planes are set between the second plane 108q and top surface 62.

Although not shown, this tire 102 also with the tire 2 shown in Fig. 1 equally using Mold Making.In this mould, remove Go with beyond the bottom of the corresponding pair groove in edge 106 of connector 104, this mould has same with the mould 70 shown in Fig. 6 Structure.Although being not particularly illustrated explanation, the bottom of this secondary groove includes comprised with the edge 106 of connector 104 two Corresponding two planes of individual plane 108.In other words, the profile at the edge 106 of the profile of the bottom of this secondary groove and connector 104 Corresponding.

Even if in this tire 102, also same with the tire 2 shown in Fig. 1, for linking wear indicator 60 and tap drain 50 The connector 104 of side wall 56 contribute to the discharge of air.Therefore this tire 102 suppresses the residual of air.Due to because of air The rubber flowing remaining and causing is bad suppressed, thus restrained effectively the defect causing because the flowing of this rubber is bad Occur.And because the edge 106 of connector 104 includes two planes 108, therefore, and with the side of arc representation connector 66 The mould 70 used by tire 2 of edge 68 profile is compared, and the mould processing used by this tire 102 is easier.As a result, especially in handss Effect is significant during carving processing mold.Action due to this connector 104 constrained side wall 56.In the tire 102 of transport condition, should Connector 104 suppresses the metamorphosis of tap drain 50.Because the change of drainage performance is little, this tire 102 can stably keep good Good drainage performance.Metamorphosis due to ground plane are also suppressed, and the performance change of therefore control stability etc. is also little.Epicycle Tire 102 can well and stably keep the performance of control stability etc..

In fig .9, symbol pa is the boundary between side wall 56 and the first plane 108p.When in side wall 56 and the first plane When being provided with circular arc, plane etc. between 108p, the extended line of the first plane 108p and side wall 56 (or the prolongation of this side wall 56 Line) intersecting position be confirmed as demarcate pa.Symbol pb is the boundary between the second plane 108q and this top surface 62.When second When being provided with circular arc, plane etc. between plane 108q and top surface 62, the extended line of the second plane 108q and top surface 62 (or this top The extended line in face 62) intersecting position be confirmed as demarcate pb.Solid line lab is to tilt, with side wall 56 or top surface 62, the void extending Intend straight line.This straight line lab passes through the pa and boundary pb that demarcates.Although being based in this paragraph and being erected at a side wall 56b and abrasion Connector 104b between indicator 60 is illustrated to boundary pa and boundary pb and straight line lab, but another for being erected at Connector 104a between side wall 56a and wear indicator 60 similarly determines this boundary pa and boundary pb and straight line lab.

In fig .9, double-head arrow hh is the radial direction distance from top surface 62 to tread surface 24.Double-head arrow ha is from top surface 62 to boundary pa radial direction distance.

In this tire 2, preferred distance ha is less than more than 0.4 0.6 with the ratio apart from hh.This ratio is set as More than 0.4, contribute to connector 104 and be effectively discharged out air.Due to this connector 104 constrained side wall 56, thus suppressing tap drain 50 metamorphosis.And this connector 104 is easily worked.Based on this viewpoint, being more highly preferred to this ratio is more than 0.45. By this ratio is set as less than 0.6, suitably maintain the size of connector 104.It is used for because rubber is fully filled Formed in the secondary groove of connector 104, be therefore difficult to make this connector 104 produce defect.Based on this viewpoint, it is more highly preferred to this ratio It is worth for less than 0.55.This ratio preferred is 0.50.

In fig .9, the position that symbol pt is intersected with tap drain 50 for top surface 62.Specifically, for representing top surface 62 profile The extended line of straight line with for representing the position that the line of tap drain 50 profile intersects.Double-head arrow ww is extremely another from a side position pt The axial distance of side position pt2.This is also the length of top surface 62 apart from ww.Double-head arrow wb is the axial direction from position pt to the pb that demarcates Distance.

In this tire 2, preferred distance wb is less than more than 0.1 0.4 with the ratio apart from ww.This ratio is set as More than 0.1, contribute to connector 104 and be effectively discharged out air.Due to this connector 104 constrained side wall 56, thus suppressing tap drain 50 metamorphosis.And this connector 104 is easily worked.Based on this viewpoint, being more highly preferred to this ratio is more than 0.20. By this ratio is set as less than 0.4, suitably maintain the size of connector 104.It is used for because rubber is fully filled Formed in the secondary groove of connector 104, be therefore difficult to make this connector 104 produce defect.Based on this viewpoint, preferably this ratio is Less than 0.30.This ratio preferred is 0.25.

In fig .9, angle γ is straight line lab and side wall 56 angulation.Angle γ a is the first plane 108p and side wall 56 angulations.

In this tire 2, optimized angle γ a is less than more than 0.4 0.6 with the ratio of angle γ.This ratio is set as More than 0.4, contribute to connector 104 and be effectively discharged out air.Due to this connector 104 constrained side wall 56, thus suppressing tap drain 50 metamorphosis.And this connector 104 is easily worked.Based on this viewpoint, being more highly preferred to this ratio is more than 0.45. By this ratio is set as less than 0.6, suitably maintain the size of connector 104.It is used for because rubber is fully filled Formed in the secondary groove of connector 104, be therefore difficult to make connector 104 produce defect.Based on this viewpoint, it is more highly preferred to this ratio For less than 0.55.This ratio preferred is 0.50.

In fig .9, angle η is straight line lab and top surface 62 angulation.Angle η a is the second plane 108q and top surface 62 Angulation

In this tire 2, optimized angle η a is less than more than 0.4 0.6 with the ratio of angle η.This ratio is set as 0.4 More than, contribute to connector 104 and be effectively discharged out air.Due to this connector 104 constrained side wall 56, thus suppressing tap drain 50 Metamorphosis.And this connector 104 is easily worked.Based on this viewpoint, being more highly preferred to this ratio is more than 0.45.Pass through This ratio is set as less than 0.6, suitably maintains the size of connector 104.Because rubber is fully filled for being formed In the secondary groove of connector 104, therefore it is difficult to make this connector 104 produce defect.Based on this viewpoint, being more highly preferred to this ratio is Less than 0.55.This ratio preferred is 0.50.

[embodiment]

Below, the effect of the present invention is described using embodiment, but should not be solved with limiting according to the record of the present embodiment Release the present invention.

[embodiment 1]

Make the tire shown in Fig. 1-4.The size of this tire is 225/45zr17.In the present embodiment 1, in 1 tap drain In be formed with 9 wear indicators.First connector and the second connector are respectively arranged with each wear indicator.These Represented by " sc " in the hurdle of the discharger of following tables 1.The specification of this first connector and the second connector such as table 1 institute Show.

[comparative example 1]

Comparative example 1 is conventional tire.It is not provided with connector in this comparative example 1.These are by the discharge of following tables 1 "-" in the hurdle of device represents.

[comparative example 2]

By be not provided with connector and part corresponding with wear indicator in a mold arrange steam vent and other then Mode same as Example 1 obtains the tire of comparative example 2.Using steam vent as discharger, and the row in following tables 1 Go out in the hurdle of device and represented with " vp ".

[comparative example 3]

By be not provided with connector and in wear indicator on setting recess and other same as Example 1 by way of obtain The tire of comparative example 3.Using recess as discharger, and represented with " recess " in the hurdle of the discharger of table 1 below.

[comparative example 4]

By be not provided with connector and in wear indicator on setting protuberance and other same as Example 1 by way of obtain The tire of comparative example 4.Such as the connector of embodiment 1, this protuberance is not connected with the side wall of tap drain.Comparative example 4 adopt convex Portion is as discharger, and is represented with " protuberance " in the hurdle of the discharger of table 1 below.

[embodiment 2-6]

By radius of curvature rc1 of the edge contour circular arc representing the first connector and the side of the second connector will be used for Radius of curvature rc2 of edge profile circular arc is set as described in Table 2 and other obtain comparative example with embodiment 1 identical mode The tire of 2-6.

[embodiment 7-10]

By by the thickness t2 of the thickness t1 of the first connector and the second connector be set as described in Table 3 and its He obtains the tire of comparative example 7-10 with embodiment 1 identical mode.

[embodiment 10-14]

By by the number of the number of the first connector and the second connector be set as described in Table 4 and other with Embodiment 1 identical mode obtains the tire of comparative example 11-14.

[generation of defect and flash]

Observation trial-production tire (10) by visual observation, the defect on confirmation wear indicator and the situation occurred of flash.Logical Cross and will confirm that the number of the wear indicator ratio total with wear indicator that defect occurs calculates as fraction defective and fall vacant Fall into.It is confirmed whether to produce flash.These results represent in following table 1-4.The numerical value of fraction defective more little then suppression defect It is better to occur.Represented with " ng " when having flash to produce when flash is then produced by no flash with " g ".

[drainage performance]

By trial-production tire be assembled in regular wheel rim, and make to this tire filling air intrinsic pressure for 230kpa.By this tire It is installed on interior drum-type testing machine, and running test is implemented on the wet bituminous paving of depth of water 5mm with load 5kn, 1 ° of drift angle.Meter Survey the generation of water surface skidding.And using this result as exponential representation in table 1 below -4.Number is more big, has more excellent Good drainage performance.

[control stability]

Trial-production tire is assembled in regular wheel rim, and filling air make this tire intrinsic pressure for 230kpa.This tire is pacified It is attached on the passenger car that capacity is 4300cc.Driver passes through to run this passenger car on racing car circuit, to control stability Evaluated.And using this result as exponential representation in table 1 below and table 4.Numerical value is more big then better.Additionally, in this evaluation In, trial-production tire is installed on this passenger car, makes first end te1 of tread surface be located at the inner side of this passenger car.Therefore, each First connector of wear indicator is located at inner side in the width of this passenger car, and its second connector is in the width of this passenger car Degree direction is located at outside.

[table 1]

Table 1 evaluation result

[table 2]

Table 2 evaluation result

[table 3]

Table 3 evaluation result

[table 4]

Table 4 evaluation result

As shown in 1-4, compared with comparative example, the having higher rating of the tire of embodiment.Based on this evaluation result, this Bright superiority is obvious.

[probability utilizing in industry]

The connector of wear indicator described above is applicable to the tire of various vehicles.

Claims (10)

1. a kind of pneumatic tire it is characterised in that:

Possess the tyre surface that its outer surface constitutes tread surface,

It is carved with, on described tyre surface, the tap drain extending in the circumferential,

The depth of described tap drain is more than 6mm,

Equal with the depth of described tap drain or this tap drain the width of the width of described tap drain is more than the depth of described tap drain,

The width of described tap drain is more than 6% with the ratio of the width of described tread surface,

Be provided with wear indicator in described tap drain, described wear indicator from the bottom of described tap drain to radial direction outside It is prominent,

The connector of film like is provided with described wear indicator, described connector is located at the radius of described wear indicator Outside direction, described connector is connected with the side wall of described wear indicator and described tap drain.

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

Described connector possesses the edge being erected between described wear indicator and described side wall,

The profile at described edge is circular arc,

The radius of curvature of described circular arc is more than 4mm.

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

The thickness of described connector is more than 0.3mm below 1.2mm.

4. pneumatic tire according to any one of claim 1 to 3 it is characterised in that

Multiple described connectors are provided with described wear indicator, these connectors are arranged at intervals in the circumferential, institute State and be spaced apart more than 2mm.

5. pneumatic tire according to claim 4 it is characterised in that

The plurality of connector includes:

For connecting the first connector of described wear indicator and the side side wall of described tap drain；With

For connecting the second connector of described wear indicator and the opposite side side wall of described tap drain.

6. pneumatic tire according to claim 5 it is characterised in that

When this tire is installed on vehicle, the end of the side of described tread surface is made to be located at the inner side of vehicle, now, described The number of the second connector is more than the number of described first connector.

7. pneumatic tire according to any one of claim 1 to 6 it is characterised in that

Also there is enhancement layer inside the radial direction of described tyre surface,

Thickness from the bottom of described tap drain extremely described enhancement layer is more than 1.3mm.

8. pneumatic tire according to claim 1 it is characterised in that

Described connector possesses the edge being erected between described wear indicator and described side wall,

Described edge possesses two planes, and these planes are arranged with respect to described sidewall slope,

A plane near described side wall is less than another plane and this side wall angulation with this side wall angulation.

9. one kind be used for manufacturing airtyred mould it is characterised in that:

Possess circular mold cavity surface,

Described mold cavity surface has the ridge extending in the circumferential,

Described ridge has from the recessed main groove of its top surface,

Described main groove has from its bottom secondary groove recessed further,

The bottom of described main groove and the side composition angle of described ridge,

Described pair groove is located at described angle.

10. a kind of airtyred manufacture method, comprising:

Prepare the operation of green tire；

Described green tire is put into the operation of mould；

The operation in described mould, described green tire pressurizeed and heated；

Described mould possesses circular mold cavity surface,

Described mold cavity surface has the ridge extending in the circumferential,

Described ridge has from the recessed main groove of its top surface,

Described main groove has from its bottom from secondary groove recessed further,

The bottom of described main groove and the side composition angle of described ridge,

Described pair groove is located at described angle.