CN106364261B - Pneumatic tire - Google Patents

Abstract

The present invention provides a kind of pneumatic tire that inhibition defect occurs.The standby tyre surface that tread surface is made of its outer surface of epicycle mould.The tap drain extended in the circumferential is carved on the tyre surface.The depth DG of the tap drain is 6mm or more.The width WG of the tap drain and depth DG of the tap drain is same or the width WG of the tap drain is greater than the depth DG of the tap drain.The ratio of the width of the width WG and tread surface of the tap drain is 6% or more.Wear indicator is provided in the tap drain.The wear indicator is prominent from the bottom of the tap drain to radial direction outside.The connector of film-form is provided on the outside of the radial direction of the wear indicator.The connector is connect with the side wall of the wear indicator and the tap drain.

Description

Pneumatic tire

Technical field

The present invention relates to a kind of pneumatic tires.

Background technique

Groove is carved on the tyre surface of tire.In the rainy day, which helps to will be present between road surface and tire Water discharge, to prevent the generation of water surface slipping phenomenon.

Tyre surface is made of vulcanized rubber.Tyre surface is worn because using.Abrasion will lead to shallower groove.Shallower decorative pattern Ditch then will affect drainage performance.And when drainage performance reduces, then there may be water surface slipping phenomenon.

Therefore, the degree for grasping tire wear is more important.And it can be arranged in tire to grasp the degree of wear Wear indicator.

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

After treadwear, eventually expose wear indicator.It, may if reaching the limit of wear and continuing to wear Reduce drainage performance, the depth of the groove of the height and limit of wear indicator matches.Driver can be by true Recognize the exposing degree of wear indicator and holds the degree of wear.

The outer surface of tire is formed by the mold cavity surface of mold.In the mold of the tire above-mentioned with wear indicator In, in order to carve tap drain on tyre surface, mold cavity surface has ridge.In order to which wear indicator, the ridge of mold are arranged in tap drain With groove.Ridge has top surface corresponding with the bottom of tap drain.Groove is recessed from the top surface.

In the manufacture of tire, green tire (raw cover) (unvulcanized tire) is put into open mold.After investment Close mold.Green tire is pressurizeed and is heated in a mold.Mold cavity surface is abutted with green tire.Ridge is then embedded in green tire.

In the manufacture of the tire, when ridge is embedded in green tire, the top surface of the ridge is abutted with green tire.As previously mentioned, recessed Slot is recessed from the top surface.Therefore, residual air is easy between the groove and green tire.

The residual of air will lead to defect.And in the tire with wear indicator, it is easy at the wear indicator Generate defect.Defect can damage the appearance of wear indicator tire in other words.

The viewpoint that the tire with good appearance is obtained based on the generation for inhibiting defect, is carrying out various researchs. Japanese Unexamined Patent Publication 2013-180707 bulletin discloses an example in the research.In the tire recorded in the bulletin, opposite grinding Damage indicator is provided with recess portion.In this way to reduce the volume of wear indicator.

In the manufacture of tire, make rubber that vulcanization reaction occur by heating.The vulcanization reaction along with by-product life At.Since most tires is manufactured using mold.Therefore, the inclining with by-product accumulation on the mold cavity surface of mold To.When by-product accumulates surplus, deposit can damage the exterior quality of tire.From the viewpoint of the exterior quality of tire, Mold can be by periodic cleaning.The cleaning is to be eliminated from spray gun towards mold cavity surface jet grinding material using the abrasive of the injection The dirt of mold cavity surface.This method for cleaning is referred to as blast cleaning.

Patent document 1: Japanese Unexamined Patent Publication 2013-180707 bulletin

Summary of the invention

In the mold for tire recorded in above-mentioned bulletin, it is provided on the mold cavity surface of mold and refers to for wearing Show the groove of device.And the bottom of the groove is provided with protrusion due to the recess portion of wear indicator.

As previously mentioned, abrasive is sprayed to mold cavity surface in the cleaning of mold.And protrusion above-mentioned is thin and small.Cause This, the cleaning is sometimes by protrusion wear down.When protrusion is by wear down, recess portion can not be formed in wear indicator.The tire exists The effect of recess portion generation may be cannot keep in the case where cleaning mold and long-time service.Also, the inhibition that the recess portion generates lacks Sunken effect is simultaneously insufficient.

In the tire with wear indicator, the generation of defect is not inhibited fully and stably.The tire Among technology for inhibiting defect to occur is being established.

The purpose of the present invention is to provide a kind of pneumatic tires that inhibition defect occurs.

Pneumatic tire of the invention has the tyre surface that tread surface is made of its outer surface.It is carved on the tyre surface in week The tap drain upwardly extended.The depth of the tap drain is 6mm or more.The depth of the width of the tap drain and the tap drain it is same or The width of the tap drain is greater than the depth of the tap drain.The ratio of the width of the tap drain and the width of the tread surface is 6% or more.Wear indicator is provided in the tap drain.The wear indicator is from the bottom of the tap drain towards radius side It protrudes outward.The connector of film-form is provided in the wear indicator.The connector is located at abrasion instruction On the outside of the radial direction of device.The connector is connect with the side wall of the wear indicator and the tap drain.

It is preferred that the connector of this pneumatic tire has the side being erected between the wear indicator and the side wall Edge.The profile at the edge is circular arc.The radius of curvature of the circular arc is 4mm or more.

It is preferred that the connector of this pneumatic tire with a thickness of 0.3mm or more 1.2mm or less.

It is preferred that being provided with multiple connectors on the wear indicator of this pneumatic tire, these connectors exist It is arranged at intervals in circumferential direction, is divided into 2mm or more between described.

It is preferred that multiple connectors of this pneumatic tire include for connecting the wear indicator and the tap drain It first connector of side side wall and is connect for connecting the wear indicator with the second of the other side side wall of the tap drain Body.

It is preferred that being installed on vehicle when this pneumatic tire is configured to this tire, make the end of the side of the tread surface When positioned at the inside of vehicle, the number of second connector is more than the number of first connector.

It is preferred that this pneumatic tire also has enhancement layer on the inside of the radial direction of the tyre surface.From the bottom of the tap drain To the enhancement layer with a thickness of 1.3mm or more.

It is preferred that the connector of this pneumatic tire has the side being erected between the wear indicator and the side wall Edge.The edge has two planes, and these planes are arranged relative to the sidewall slope.Close to one of the side wall Plane and the side wall angulation are less than another plane and the side wall angulation.

The mold of pneumatic tire for manufacturing the present invention has circular mold cavity surface.The mold cavity surface has The ridge upwardly extended in week.The ridge has the main groove recessed from its top surface.The main groove has from its bottom into one Walk recessed secondary groove.The bottom of the main groove and the side of the ridge constitute angle.The pair groove is located at the angle.

The manufacturing method of pneumatic tire of the invention includes:

(1) prepare the process of green tire

(2) by the process of green tire investment mold

(3) process that the green tire is pressurizeed and heated in the mould

The mold has circular mold cavity surface.The mold cavity surface has the ridge extended in the circumferential.It is described Ridge has the main groove recessed from its top surface.The main groove has from the further recessed secondary groove in its bottom.The master The bottom of groove and the side of the ridge constitute angle.The pair groove is located at the angle.

In pneumatic tire of the invention, facilitate air for connecting the connector of side wall of wear indicator and tap drain Discharge.Inhibited in the residual of the hollow gas of this tire.Rubber flowing is bad due to caused by the residual because of air is pressed down System, thus effectively inhibit because the rubber flow it is bad caused by defect generation.The present invention, which obtains, inhibits defect generation Pneumatic tire.

Detailed description of the invention

Fig. 1 is the cross-sectional view for indicating pneumatic tire a part of an embodiment of the invention.

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

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

Fig. 4 is the cross-sectional view of IV-IV line along Fig. 3.

Fig. 5 is the top view indicated for manufacturing mold a part of the tire of Fig. 1.

Fig. 6 is the cross-sectional view of VI-VI line along Fig. 5.

Fig. 7 is the cross-sectional view of VII-VII line along Fig. 5.

Fig. 8 is the schematic diagram for indicating to have with the wear indicator of the mode different modes of wear indicator shown in Fig. 3.

Fig. 9 is the enlarged cross-sectional view of pneumatic tire a part of 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 surfaces

46 ... enhancement layers

48 ... grooves

50 ... tap drains

The edge of 52 ... tap drains

The bottom of 54 ... tap drains

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

60 ... wear indicators

The top surface of 62 ... wear indicators

The angle of 64 ... wear indicators

66,66a, 66b ... connector

The edge of 68 ... connectors

70 ... molds

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 indicator alternatively

102 ... tires

104,104a, 104b ... connector

106 ... edges

108,108p, 108q ... plane

Specific embodiment

In the following, suitably referring to attached drawing and according to preferred embodiment and the present invention will be described in detail.

Fig. 1 shows pneumatic tires 2.In Fig. 1, up and down direction is the radial direction of tire 2, and left and right directions is tire 2 Axial, the vertical direction with paper is the circumferential direction of tire 2.In Fig. 1, chain-dotted line CL indicates the equatorial plane of tire 2.Except tyre surface flower Other than line, the shape of this tire 2 is symmetrical relative to the equatorial plane.

This tire 2 has 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 of buffer layer 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.Tyre surface 4 forms the tread surface 24 contacted with road surface. In other words, the outer surface of tyre surface 4 constitutes tread surface 24.

In Fig. 1, symbol TE indicates the specific position on the outer surface of tire 2.Position TE is the outer surface of this tire 2 On tyre surface 4 and sidewall 6 between boundary.In the present invention, position TE is the end of tread surface 24.

Tyre surface 4 has tire base 26 and crown layer 28.Crown layer 28 is located on the outside of the radial direction of tire base 26.Crown layer 28 are laminated in tire base 26.Tire base 26 is made of the vulcanized rubber with excellent adhesion.The typical matrix of tire base 26 Rubber is natural rubber.Crown layer 28 with excellent wear, heat resistance and the vulcanized rubber of creep properties by constituting.

Tyre surface 4 is also equipped with a pair of of tire wing 30.Each tire wing 30 is located at the tyre surface 4 being made of crown layer 28 and tire base 26 Between ontology 32 and sidewall 6.The tire wing 30 is engaged with the ontology 32 of tyre surface 4 and sidewall 6 respectively.The tire wing 30 is by with good adhesion Property vulcanized rubber constitute.

In Fig. 1, double-head arrow TT is the thickness of tyre surface 4.In the present invention, thickness TT is indicated from the tyre surface in the equatorial plane 4 inner surface to its outer surface (tread surface 24) length.In addition, when aftermentioned tap drain is set to equator (Fig. 1 of tire 2 Symbol EQ shown in position in tread surface 24) on when, will be in close to the equatorial plane and not tire of the position measurement of tap drain The thickness in face 4 is as thickness TT.

In this tire 2, based on the viewpoint for playing its performance, the preferably thickness TT of tyre surface 4 is 7.3mm.Based on inhibit compared with Big influence of the thickness TT to quality and rolling resistance, preferably thickness TT are 11mm or less.Based on the fever for inhibiting tyre surface 4 Further increase the viewpoint of high speed durability, preferably thickness TT be 10mm hereinafter, be more highly preferred to thickness TT be 9mm hereinafter, Preferred thickness TT is 8mm or less.

Each sidewall 6 extends from tyre surface 4 to radial direction substantially inside.The sidewall 6 by with excellent belt cutting-resisting property with And the vulcanized rubber of anti-aging property is constituted.The sidewall 6 prevents the damage of carcass 12.

Each toe mouth 8 is located at the radial direction substantially inside on sidewall 6.Toe mouth 8 is presented axially in tyre bead 10 and carcass 12 Outside.Toe mouth 8 is made of the vulcanized rubber with good wear performance.Although not shown, toe mouth 8 and the flange of wheel rim are supported It connects.

Each tyre bead 10 is located at the axially inner side of toe mouth 8.Tyre bead 10 has bead core 34 and from the bead core 34 towards partly The triangle rubber 36 extended on the outside of diameter direction.Bead core 34 is cyclic annular, and the steel wire of the inductility including winding.The typical case of steel wire Material is steel.Triangle rubber 36 is towards the tip on the outside of radial direction.Triangle rubber 36 is made of the vulcanized rubber of high rigidity.

Carcass 12 is made of the first plies 38 and the second plies 40.First plies 38 and the second plies 40 are set up in two 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 and from axially Inside is turned back towards outside.

Although not shown, the first plies 38 and the second plies 40 are respectively by multiple cords and rubberizing rubber arranged side by side (topping rubber) is constituted.The absolute value of each cord and equatorial plane angulation is 75 ° to 90 °.In other words, the tire Body 12 has radial construction.Cord is made of organic fiber.It is preferred that 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 on the inside of the radial direction of tyre surface 4.Belt 14 and carcass 12 are laminated.Belt 14 is to carcass 12 Reinforced.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 slightly Greater than the width of outer layer 44.Although not shown, la m 42 and outer layer 44 respectively include multiple cords and rubberizing arranged side by side Rubber (topping rubber).Each cord is tilted relative to the equatorial plane.The general absolute value of tilt angle is 10 ° or more 35 ° or less.The cord of la m 42 relative to the equatorial plane inclined direction with outer layer 44 cord inclining relative to the equatorial plane Tilted direction is opposite.The preferred material of cord is steel.Organic fiber can also be used for cord.It is preferred that belt 14 is axial wide Degree is 0.7 times or more of the maximum width of tire 2.Belt 14 can also have 3 layers or more.

Casing ply 16 is located on the outside of the radial direction of belt 14.In the axial direction, the width of casing ply 16 is greater than belt 14 width.Although not shown, which includes cord and rubberizing rubber.Cord is wound in helical form.The cord Layer 16 has so-called non junction structure.Cord actually extends in the circumferential.Cord and circumferential angle are 5 ° hereinafter, in turn It is 2 ° or less.Since belt 14 is fettered by the cord, so that the protuberance of belt 14 is inhibited.Cord is by organic fiber structure At.It is preferred that 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 on the inside of the radial direction of tyre surface 4.Change speech It, this tire 2 has the enhancement layer 46 on the inside of the radial direction of tyre surface 4.In this tire 2, enhancement layer 46 can also only by Belt 14 is constituted.Enhancement layer 46 can also be only made of casing ply 16.

Inner liner 18 is located at the inside of carcass 12.Inner liner 18 is engaged with the inner surface of carcass 12.Inner liner 18 is by having The vulcanized rubber of excellent air-tightness is constituted.The typical material of inner liner 18 is butyl rubber or halogenated butyl rubber.Inner liner 18 keep the internal pressure of tire 2.

Each buffer layer 20 is laminated near the end of belt 14 with carcass 12.Buffer layer 20 is made of soft rubber. Buffer layer 20 absorbs the stress of the end of belt 14.The buffer layer 20 inhibits belt 14 to swell.

Chafer 22 is located near tyre bead 10.When by tire 2 loaded on wheel rim, the chafer 22 and wheel Rim abuts.The abutting near tyre bead 10 so that protected.In the present embodiment, chafer 22 by cloth and is impregnated in this The rubber of cloth is constituted.The chafer 22 can be made of material identical with the material of toe mouth 8.At this point, chafer 22 with Toe mouth 8 is integral.

Fig. 2 indicates a part of the tread surface 24 of this tire 2.Up and down direction in the Fig. 2 is the circumferential direction 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 on the tyre surface 4 of this tire 2.These grooves 48 form tread contour.Tread surface The part other than groove 48 in 24 is with being also referred to as tire (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 equatorial plane to tyre surface 4 One region) in tread contour and other end TE2 (hereinafter referred to as second end) from the equatorial plane to tyre surface 4 region Z2 (with Be known as second area down) in tread contour it is different.The tread contour of this tire 2 is relative to equatorial plane asymmetry.Tyre surface flower Line is relative to equatorial plane asymmetry.When this tire 2 is installed on vehicle, the first end TE1 of tread surface 24 is located at vehicle Inside, the second end TE2 of the tread surface 24 are located at the outside of the vehicle.

In this tire 2, the multiple grooves 48 for constituting tread contour include the multiple tap drains being extended continuously in the circumferential 50.In other words, the multiple tap drains 50 being extended continuously in the circumferential are carved on the tyre surface 4 of this tire 2.On the tyre surface 4 of this tire 2 Tap drain 50 there are three carving.In Fig. 2 of this specification, the tap drain 50a positioned at the rightmost side is also referred to as the first tap drain, be located at this first The tap drain 50b in the left side of tap drain 50a is also referred to as the second tap drain, positioned at second tap drain 50b more left side tap drain 50c also by Referred to as third tap drain.

In this tire 2, the number for the tap drain 50 that first area Z1 includes is more than the tap drain 50 that second area Z2 includes Number.This is because ground plane is formed, 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.Width WT indicates 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.Width WG indicates the side from the side of tap drain 50 Edge 52 to the other side edge 52 length.

In this tire 2, the ratio of the width WT of the width WG and tread surface 24 of tap drain 50 is 6% or more.Pass through this Kind mode makes tap drain 50 ensure enough width WG.The tap drain 50 of this tire 2 helps to drain.So that this tire 2 reaches At good drainage performance.The width WG of tap drain 50 influences the contact area of tread surface 24.Based on substantially ensuring the ground plane Long-pending viewpoint, the preferably ratio are 15% or less.

Fig. 3 indicates a part of the first tap drain 50a in Fig. 2.Up and down direction in the Fig. 3 is the circumferential direction 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 indicates cuing open for IV-IV line along Fig. 3 Face.Up and down direction in the 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 For the circumferential direction of tire 2.

Tap drain 50 has bottom 54 and a pair of sidewalls 56.Each side wall 56 prolongs from bottom 54 to radial direction substantially outside It stretches.Side wall 56 and bottom 54 constitute angle 58.It in other words, is angle 58 between side wall 56 and bottom 54.As shown in figure 4, side wall 56 with The angle 58 at the angle 58 between bottom 54, i.e. tap drain 50 is set to circle.In Fig. 4, arrow Ra is the radius of curvature at the angle 58. In this tire 2, indicate that the radius of curvature R a of the circular arc at the angle 58 is 1mm or more 4mm or less.

In Fig. 4, double-head arrow DG is the depth of tap drain 50.Depth DG is indicated from tread surface 24 to the bottom of tap drain 50 54 length.When bottom 54 is uneven, depth DG indicates depth capacity.In Fig. 4, double-head arrow TG is indicated from tap drain 50 Bottom 54 to enhancement layer 46 thickness.Thickness TG is also referred to as groove bottom thickness.When the bottom of tap drain 50 54 is uneven, Thickness TG indicates minimum thickness.

The depth DG of the tap drain 50 of this tire 2 is 6mm or more.Tap drain 50 is made to ensure enough depth in this way DG.The tap drain 50 of this tire 2 facilitates drainage performance.So that this tire 2 reaches good drainage performance.Based on the sight Point, preferably depth DG are 6.0mm or more, more preferably 7.0mm or more.

As previously mentioned, enhancement layer 46 is located on the inside of the radial direction of tread surface 4.When tap drain 50 uses larger depth DG When, the bottom 54 of tap drain 50 may rupture and the enhancement layer 46 is exposed.In this tire 2, preferred thickness TG is set as More than 1.3mm.In this way, suitably ensure the thickness from the bottom of tap drain 50 54 to enhancement layer 46, to prevent this The exposing of enhancement layer 46.Based on the viewpoint, in this tire 2, considers the thickness of tyre surface 4 and suitably adjust the depth of tap drain 50 DG, so as to ensure that thickness TG is 1.3mm or more.Since the depth DG of tap drain 50 is determined after considering thickness TG, because This does not set the preferred upper limit of the depth DG of the tap drain 50.

In tire 2, the depth DG of the width WG of tap drain 50 and the tap drain 50 is same or the width WG of the tap drain 50 is big In the depth DG of the tap drain 50.In this tire 2, even if the tap drain 50 is also effectively using the tyre surface 4 with relatively small thickness TT Facilitate drainage performance.This tire 2 not only maintains good drainage performance, but also reaches further increasing for high speed durability. Based on the viewpoint, the preferably width WG of tap drain 50 is greater than the depth DG of the tap drain 50.In more detail, be more highly preferred to width WG with The ratio of depth DG is 1.1 or more, and preferred is 1.2 or more.The viewpoint of influence based on inhibition tap drain 50 to contact area, It is preferred that the ratio is 2.0 hereinafter, more preferably 1.8 or less.

Wear indicator 60 (Wear Indicator) is provided 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.The interval is according to wheel The specification of tire 2 and suitably determine.

Wear indicator 60 is prominent from the bottom of tap drain 50 54 towards radial direction outside.In other words, wear indicator 60 It is to be swelled by a part of the bottom 54 of tap drain 50 and constituted.As shown in figure 4, wear indicator 60 is erected at the one of tap drain 50 Between side side wall 56 and other side side wall 56.The top surface 62 of the wear indicator 60 of this tire 2 is flat.The top surface 62 and tap drain 50 bottom 54 is substantially parallel.The top surface 62 and side wall 56 constitute angle 64.It in other words, is angle 64 between top surface 62 and side wall 56. As shown in figure 4, the angle 64 between top surface 62 and side wall 56, i.e. the angle 64 of wear indicator 60 is set to circle.In Fig. 4, Arrow Rb is the radius of curvature at the angle 64.In this tire 2, for indicate the angle 64 circular arc radius of curvature R b be 1mm with Upper 4mm or less.

In Fig. 4, two arrow HW are the height of wear indicator 60.Height HW indicate from the bottom of tap drain 50 54 to The height of the top surface 62 of wear indicator 60.When the bottom of tap drain 50 54 is uneven, height HW indicates maximum height.

As previously mentioned, tyre surface 4 is made of vulcanized rubber.Tyre surface 4 is worn because using.Abrasion causes tap drain 50 to shoal.Compared with Shallow tap drain 50 will affect drainage performance.When drainage performance reduces, then there may be water surface slipping phenomenon.

In this tire 2, the top surface 62 of wear indicator 60 is located at than tread surface 24 on the inside of radial direction.Work as tyre surface After 4 abrasions, the top surface 62 of the wear indicator 60 can finally 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 drainage performance be made to reduce.Driver can hold abrasion by confirming the exposing degree of wear indicator 60 Degree.In common tire 2, height HW is set at 1.5mm to 2.0mm range.In this tire 2, wear indicator 60 height HW is 1.7mm.

In this tire 2, the connector 66 of film-form is provided on wear indicator 60.Specifically, in this tire 2 Wear indicator 60 on setting there are four connector 66.As shown in figure 4, these connectors 66 are located at the half of wear indicator 60 On the outside of diameter direction.Each connector 66 is connect with the side wall 56 of wear indicator 60 and tap drain 50.

Connector 66 has the edge 68 being erected between side wall 56 and wear indicator 60.The profile at the edge 68 is half Diameter side is convex upwardly toward inside.In this tire 2, the profile at edge 68 is circular arc.

In this tire 2, multiple connectors 66 are provided on wear indicator 60.In the tire 2 shown in Fig. 1-4, There are four connectors 66 for setting on one wear indicator 60.In these connectors 66, two connector 66a and abrasion are indicated Device 60 connects.And the two connectors 66a and side wall 56a positioned at the side first end TE1 of tread surface 24 is (hereinafter referred to as The first side wall) connection.Other two connector 66b is connect with wear indicator 60.And remaining two connector 66b also with Side wall 56b (hereinafter referred to as second sidewall) connection positioned at the side second end TE2 of tread surface 24.In addition, by the present invention The connector 66a positioned at the side the first side wall 56a be known as the first connector, will be located at the side second sidewall 56b connector 66b is known 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.The number of the first connector 66a on one wear indicator 60 is set And second the number of connector 66b suitably determined according to the size for the wear indicator 60 for being set to tire 2.

In Fig. 3, double-head arrow D1 indicates a first connector 66a and is located at first connector in the circumferential The interval between another first connector 66a beside 66a.In this tire 2, based on being easily formed the first connector 66a's Viewpoint, the preferably interval D 1 are 2mm or more.Further, since the interval D 1 is existed by the size and setting of wear indicator 60 What the number of the first connector 66a on the wear indicator 60 determined, the preferred upper limit of the interval D 1 has no special setting.

In Fig. 3, double-head arrow D2 indicates a second connector 66b and is located at second connector in the circumferential The interval between another second connector 66b beside 66b.In this tire 2, based on being easily formed the second connector 66b's Viewpoint, the preferably interval D 2 are 2mm or more.Further, since the interval D 2 is existed by the size and setting of wear indicator 60 What the number of the second connector 66b on the wear indicator 60 determined, the preferred upper limit of the interval D 2 has no special setting.

In Fig. 4, symbol P1a is the boundary between the edge 68 and the first side wall 56a of the first connector 66a.Symbol P1b For the boundary between the edge 68 of 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 connect at boundary P1a with the first side wall 56a.This first The edge 68 of connector 66a is connect at boundary P1b with the top surface 62 of wear indicator 60.For indicating first connector The center of the circular arc of the profile at the edge 68 of 66a is set to, and the edge 68 of first connector 66a is at boundary P1a It connect with the first side wall 56a, is connect at boundary P1b with the top surface 62 of wear indicator 60.

In Fig. 4, symbol P2a is the boundary between the edge 68 and second sidewall 56b of the second connector 66b.Symbol P2b For the boundary between the edge 68 of 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 connect at boundary P2a with second sidewall 56b.This second The edge 68 of connector 66b is connect at boundary P2b with the top surface 62 of wear indicator 60.For indicating second connector The center of the circular arc of the profile at the edge 68 of 66b is set to, and the edge 68 of second connector 66b is at boundary P2a It connect with second sidewall 56b, is connect at boundary P2b with the top surface 62 of wear indicator 60.

In the present invention, unless otherwise instructed, the size and angle of each component of tire 2 are assembled in just by tire 2 On gauge wheel rim, and air is fills up in tire 2, is measured in the state of so that tire 2 is become regular internal pressure.When measurement, Do not apply to tire 2 and loads.So-called regular wheel rim refers to the wheel rim of the specification defined by 2 foundation of tire in this specification. " the Design Rim " in " standard rim ", TRA specification in the JATMA specification and " Measuring in ETRTO specification Rim " is positive gauge wheel rim.So-called regular internal pressure refers to the internal pressure of the specification defined by 2 foundation of tire in this specification. " TIRE LOAD LIMITS AT VARIOUS COLD in " highest air pressure ", TRA specification in JATMA specification " INFLATION PRESSURE " in " maximum value " and ETRTO specification documented by INFLATION PRESSURES " is positive Advise internal pressure.The size and angle of riding tire for vehicles 2 are measured in the state that internal pressure is 180kPa.

Tire 2 described above is manufactured in the following manner.In the manufacture of this tire 2, by inner liner 18, carcass 12, after multiple rubber components of tyre bead 10 etc. are assembled, prepare green tire (unvulcanized tire 2).The green tire is put to mold In.Mold has circular mold cavity surface.The outer surface of mold cavity surface formation tire 2.The outer surface of green tire and the type chamber Surface abuts.The inner surface of green tire is abutted with capsule or core.Green tire is pressurized and heats in a mold.Pressurization and heating make to give birth to The rubber composition of tire flows.Heating makes rubber that vulcanization reaction occur, to obtain tire 2.The manufacturing method packet of this tire 2 It includes: (1) preparing the process of green tire, the process of green tire investment mold, (3) are pressurizeed and added to green tire in mold by (2) The process of heat.

Fig. 5 indicates a part for manufacturing the mold cavity surface 72 of mold 70 used in this tire 2.In Fig. 5, up and down Direction is equivalent to the circumferential direction 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 mold 70 shown in fig. 5 forms the part of wear indicator 60 shown in Fig. 3.In addition, the Fig. 5 Paper front is equivalent on the inside of the radial direction of tire 2, and the reverse side of the paper is equivalent on the outside of the radial direction of tire 2.

Fig. 6 indicates the section of the mold 70 of VI-VI line along Fig. 5.Fig. 7 indicates cuing open for the mold 70 of VII-VII line along Fig. 5 Face.In Fig. 6, up and down 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 for paper Histogram is to the circumferential direction for being equivalent to tire 2.In Fig. 7, up and down direction is equivalent to the circumferential direction of tire 2, and left and right directions is equivalent to tire 2 Radial direction, the axial direction of tire 2 is equivalent to the vertical direction of paper.

In the mold 70, mold cavity surface 72 has ridge 74.The ridge 74 extends in the circumferential.The ridge 74 is towards partly Diameter side protrudes inwardly.The ridge 74 has top surface 76 and a pair of of side 78.Each side 78 is from top surface 76 towards radial direction Substantially outside extends.Specifically, side 78 is tilted relative to radial direction.Tilt angle (the angle shown in fig. 6 of the side 78 Degree α 1 and angle [alpha] 2) absolute value be generally set to 5 ° to 25 ° of range.In the mold 70, top surface 76 and 78 structure of side Angulation 80.As shown in fig. 6, the angle 80 at angle 80, i.e. ridge 74 between top surface 76 and side 78 is set to circle.74 shape of ridge At the tap drain 50 of tire 2.The bottom 54 of the formation of top surface 76 tap drain 50.The side wall 56 of the formation of side 78 tap drain 50.

Ridge 74 is also equipped with main groove 82.Main groove 82 from the top surface of ridge 74 76 towards radius on the outside of it is recessed.Main groove 82 have bottom 84 and a pair of of inclined-plane 86.Each inclined-plane 86 extends from bottom 84 towards the top surface of ridge 74 76.Inclined-plane 86 is opposite It is tilted in radial direction.The absolute value of the tilt angle (angle beta 1 and angle beta 2 shown in Fig. 7) on the inclined-plane 86 is normally set up In 50 ° to 70 ° of range.The bottom 84 of the main groove 82 and the side 78 of ridge 74 constitute angle 88.As shown in fig. 6, main groove The angle 88 at angle 88, i.e. main groove 82 between 82 bottom 84 and the side 78 of ridge 74 is set to circle.In the mold 70 In, main groove 82 forms the wear indicator 60 of tire 2.

Main groove 82 is also equipped with secondary groove 90.Secondary groove 90 from the bottom of main groove 82 84 further towards radial direction outside Side is recessed.The connector 66 of the pair groove 90 formation wear indicator 60.The pair groove 90, which has, is used to form the connector 66 Edge 68 bottom 92.As previously mentioned, the profile arc representation at the edge 68 of connector 66.Therefore, the pair groove 90 Also arc representation is used in bottom 92.

As previously mentioned, in the mold 70 that green tire is put to, and pressurizeing within mold 70 in the manufacture of tire 2 And heating.At this point, the mold cavity surface 72 of mold 70 is abutted with green tire.The ridge 74 of mold cavity surface 72 is then embedded in green tire.

In the manufacture of this tire 2, when ridge 74 is embedded in green tire, the top surface 76 of the ridge 74 is abutted with green tire.Normal In the mold of rule, the abutting is so that the main groove of ridge is closed by green tire.But in mold 70 of the invention, as previously mentioned, main Groove 82 has secondary groove 90.The pair groove 90 is located at the angle being made of the side 78 of the bottom 84 of main groove 82 and ridge 74 88.In other words, which is located at the angle 88 between the bottom 84 of main groove 82 and the side 78 of ridge 74.Also, it is secondary Groove 90 is located at the position than main groove 82 by the outside of mold 70.Therefore, the space between the main groove 82 and green tire is sealed Close when it is confidential somewhat later than conventional mold.Air in above-mentioned space can be discharged to the outer of mold 70 by secondary groove 90 Side.In this mold 70, the air in the space is sufficiently displaced from by rubber.In this mold 70 so that air residual and Caused rubber flowing is bad to be inhibited.As previously mentioned, secondary groove 90 forms the connector 66 of wear indicator 60.That is, this The connector 66 of tire 2 facilitates the discharge of air.Therefore this tire 2 inhibits the residual of air.Due to the residual because of air The flowing of caused rubber is bad to be suppressed, thus restrained effectively because the rubber flow it is bad caused by defect generation. The present invention obtains the pneumatic tire 2 for inhibiting defect to occur.

As previously mentioned, the depth DG of tap drain 50 is 6mm or more in this tire 2.The width WG of tap drain 50 and the tap drain 50 Depth DG is same or the width WG of the tap drain 50 is greater than the depth DG of the tap drain 50.Also, the width WG and tire of tap drain 50 The ratio of the width WT on face surface 24 is 6% or more.The tap drain 50 of this tire 2 has the width of the tap drain width greater than conventional tire Spend WG.Tap drain 50 with larger width WG will lead to biggish wear indicator 60.Therefore, in the mold 70 of this tire 2, Main groove 82 for wear indicator 60 is greater than the main groove of the mold of conventional tire.Biggish main groove 82 is then unfavorable for sky Gas discharge.But as previously mentioned, being additionally provided with secondary groove 90 in main groove 82 in this mold 70.Therefore, although tap drain 50 is adopted With biggish width WG, but air is sufficiently discharged.This tire 2 inhibits the residual of air.Due to causing because of air residual Rubber flowing it is bad inhibited, thus restrained effectively because air residual caused by defect generation.Of the invention Connector 66 effectively further plays a role in tire 2 of the tap drain 50 using biggish width WG.Even if tap drain 50 uses Biggish width WG, but due to the generation of defect be suppressed, the tyre surface 4 with relatively small thickness can be used, so as into One step improves high speed durability.

As previously mentioned, connector 66 effectively inhibits the generation of defect in this tire 2.Therefore, for manufacturing epicycle In the mold 70 of tire 2, does not need defect in order to prevent and stomata (vent hole) is set.Due to not needing that this discharge is arranged Device, therefore after tire 2 being obtained in the state of not forming flash (spew), it does not need to tie up in the cleaning of mold 70 yet Protect discharger.This tire 2 also contributes to improving productivity.

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 the connector 66 for having the edge 68 of arc-shaped, facilitate the outside for effectively directing the air to mold 70.It is excellent based on the viewpoint The profile for selecting the edge 68 of the connector 66 is circular arc.

As previously mentioned, connector 66 is connect with the side wall 56 of wear indicator 60 and tap drain 50 in this tire 2.It should The movement of the limitation side wall 56 of connector 66.In the tire 2 of driving status, which inhibits the metamorphosis of tap drain 50. Since the variation of drainage performance is smaller, this tire 2 stably keeps good drainage performance.Due to the metamorphosis of ground plane It is suppressed, therefore the performance change of control stability etc. is also smaller.This tire 2 is good and stably keeps control stability etc. Performance.

As previously mentioned, this tire 2 is configured to, it is installed on the vehicle, the first end TE1 of tyre surface 24 is made to be located at the interior of vehicle Side.On the tyre surface 4 of this tire 2, power, which is in, to be easy from the first end TE1 of the tread surface 24 towards the side of its second end TE2 To the tendency of effect.Based on ground plane is stably formed and viewpoint that is good and stably keeping control stability, it is preferably provided with It is more than the first connector 66a's that the side first end TE1 is set in the number of the second connector 66b of the side second end TE2 Number.More specifically, preferably the difference of the number of the number of the second connector 66b and the first connector 66a is 1 or more, more Preferably 2 or more.Based on the viewpoint of connector 66 easy to form, the preferably difference is 5 hereinafter, more preferably 4 or less.Fig. 8 table It is shown as the other modes of wear indicator 60 and the number of the first connector 66a is set as 1 and by of the second connector 66b Number is set as 2 wear indicator 94.

In Fig. 3, double-head arrow T1 indicates the thickness of the first connector 66a.Double-head arrow T2 indicates the thickness of the second connector 66b Degree.

In this tire 2, preferred thickness T1 is 0.3mm or more 1.2mm or less.Thickness T1 is set as 0.3mm or more The first connector 66a is set to contribute effectively to discharge and the limitation the first side wall 56a of air.Based on the viewpoint, it is more highly preferred to Thickness T1 is 0.4mm or more.Thickness T1 is set as 1.2mm hereinafter, form the first connector with being not only able to zero defect 66a, and inhibit the influence of the first connector 66a to quality.Based on the viewpoint, being more highly preferred to thickness T1 is 1.1mm Below.

In this tire 2, preferred thickness T2 is 0.3mm or more 1.2mm or less.Thickness T2 is set as 0.3mm or more The second connector 66b is set to contribute effectively to discharge and the limitation second sidewall 56b of air.Based on the viewpoint, it is more highly preferred to Thickness T2 is 0.4mm or more.Thickness T2 is set as 1.2mm hereinafter, form the second connector with being not only able to zero defect 66b, and inhibit the influence of the second connector 66b to quality.Based on the viewpoint, being more highly preferred to thickness T2 is 1.1mm Below.

In Fig. 4, arrow Rc1 is the radius of curvature for indicating the circular arc of the profile at the edge 68 of the first connector 66a. Arrow Rc2 is the radius of curvature for indicating the circular arc of the profile at the edge 68 of the second connector 66b.

In this tire 2, preferred curvature radius Rc1 is 4mm or more.In this way, effectively make the first connector 66a facilitates discharge and the limitation the first side wall 56a of air.Based on the viewpoint, be more highly preferred to radius of curvature R c1 be 5mm with On.Biggish radius of curvature R c1 then will lead to biggish first connector 66a.And biggish first connector 66a not only cannot Fully make rubber filling to secondary groove 90 and there may be defects, and first connector 66a will affect quality.Based on this Viewpoint, preferably radius of curvature R c1 are 10mm hereinafter, more preferably 9mm or less.

In this tire 2, preferred curvature radius Rc2 is 4mm or more.In this way, effectively make the second connector 66b facilitates discharge and the limitation second sidewall 56b of air.Based on the viewpoint, be more highly preferred to radius of curvature R c2 be 5mm with On.Biggish radius of curvature R c2 then will lead to biggish second connector 66b.And biggish second connector 66b not only cannot Fully make rubber filling to secondary groove 90 and there may be defects, and second connector 66b will affect quality.Based on this Viewpoint, preferably radius of curvature R c2 are 10mm hereinafter, more preferably 9mm or less.

As previously mentioned, in the manufacture of this tire 2 green tire (unvulcanized wheel will be prepared after the assembling of multiple rubber components Tire 2).In the preparatory process of the green tire, the rubber composition as the tyre surface 4 of rubber components is squeezed out sometimes and forms tire Face 4.At this point, the shape of the mouth gold of extruder is corresponding with the section shape of tyre surface 4.Although not shown, passing through the extrusion Recess portion corresponding with tap drain 50 is formed in the section shape of the tyre surface 4 of formation.Also, the width of the bottom of the recess portion is set For 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 recess portion Bottom be also machined to it is flat.

As previously mentioned, the present invention restrained effectively the generation of defect and connector 66 are arranged in tire 2.It is based on Further promote the discharge of air and effectively further inhibits the viewpoint of the generation of the defect, it can also be at the bottom of the recess portion The protrusion of height of portion's setting with 0.3mm~0.6mm.Moreover, the section shape of the protrusion may be triangle.Pass through this Kind mode, due to further inhibiting the rubber flowing because of caused by air residual bad, to more effectively inhibit Because the rubber flow it is bad caused by defect generation.

Fig. 9 indicates a part of the pneumatic tire 102 of another embodiment of the present invention.The Fig. 9 is corresponding with earlier figures 4 Figure.In the Fig. 9, up and down 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 circumferential direction of this tire 102.

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

The wear indicator 60 of this tire 102 is provided with film-form connector 104 same as tire 2 shown in FIG. 1. The connector 104 links the side wall 56 and the wear indicator 60 of tap drain 50.The connector 104, which has, is erected at side wall 56 and mill Damage the edge 106 between indicator 60.The profile at the edge 106 is convex towards inside in the radial direction.In addition, such 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 of plane.In addition, Tap drain 50 has the side wall 56 and bottom 54.It is angle 58 between the side wall 56 and bottom 54.The profile at angle 58 is circular arc, the circular arc Radius of curvature R a be 1mm or more 4mm or less.It also, is angle 64 between side wall 56 and top surface 62.The profile at the angle 64 is circle Arc, the radius of curvature R b of the circular arc are 1mm or more 4mm or less.

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

In this tire 102, the first plane 108p is connected directly with the second plane 108q.It can also be in the first plane 108p The rounding between the second plane 108q.Other planes can also be set between the first plane 108p and the second plane 108q.In In this tire 102, side wall 56 is connected directly with the first plane 108p.It, can also be flat in side wall 56 and first 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 connected directly with top surface 62.Can also between the second plane 108q and top surface 62 rounding.It can also be Between second plane 108q and top surface 62 in addition other planes are set.

Although not shown, this tire 102 also equally uses Mold Making with tire 2 shown in FIG. 1.In the mold, remove It goes other than the bottom of secondary groove corresponding with the edge 106 of connector 104, which has same as mold 70 shown in fig. 6 Structure.Although being not particularly illustrated explanation, the bottom of the pair groove includes included two with the edge 106 of connector 104 108 corresponding two planes of a plane.In other words, the profile at the edge 106 of the profile Yu connector 104 of the bottom of the pair groove It is corresponding.

Even if also same as tire 2 shown in FIG. 1 in this tire 102, for linking wear indicator 60 and tap drain 50 The connector 104 of side wall 56 facilitate the discharge of air.Therefore this tire 102 inhibits the residual of air.Due to because of air The flowing of rubber caused by residual is bad to be suppressed, thus restrained effectively because the rubber flow it is bad caused by defect Occur.And since the edge of connector 104 106 includes two planes 108, and with the side of arc representation connector 66 Mold 70 used in the tire 2 of 68 profile of edge is compared, and the processing of mold used in this tire 102 is easier.As a result, especially in hand Significant effect when carving processing mold.Due to the movement of the connector 104 limitation side wall 56.It, should in the tire 102 of driving status The metamorphosis of the inhibition tap drain 50 of connector 104.Since the variation of drainage performance is small, this tire 102 can stably keep good Good drainage performance.Since the metamorphosis of ground plane is also suppressed, the performance change of control stability etc. is also small.Epicycle Tire 102 can be good and the performance that stably keeps control stability etc..

In Fig. 9, boundary of the symbol PA between side wall 56 and the first plane 108p.When in side wall 56 and the first plane Whens being provided with circular arc, plane etc. between 108p, the extended line of the first plane 108p and side wall 56 (or the extension of the side wall 56 Line) intersection position be confirmed as demarcate PA.Boundary of the symbol PB between the second plane 108q and the top surface 62.When second Whens 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 the top The extended line in face 62) intersection position be confirmed as demarcate PB.Solid line LAB is the void extended with side wall 56 or the inclination of top surface 62 Quasi- straight line.Straight line LAB passes through boundary PA and boundary PB.Although being based on being erected at a side wall 56b and abrasion in this paragraph Boundary PA and boundary PB and straight line LAB is illustrated in connector 104b between indicator 60, but another for being erected at Connector 104a between one side wall 56a and wear indicator 60 similarly determines 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 102, the ratio of preferred distance HA and distance HH are 0.4 or more 0.6 or less.The ratio is set as 0.4 or more, facilitate connector 104 and is effectively discharged out air.Since the connector 104 limits side wall 56, to inhibit tap drain 50 metamorphosis.And the connector 104 is easily worked.Based on the viewpoint, being more highly preferred to the ratio is 0.45 or more. By the way that the ratio is set as 0.6 hereinafter, suitably maintaining the size of connector 104.It is used for since rubber is fully filled It is formed in the secondary groove of connector 104, therefore is not easy that the connector 104 is made to generate defect.Based on the viewpoint, it is more highly preferred to the ratio Value is 0.55 or less.The preferred ratio is 0.50.

In Fig. 9, symbol PT is the position that top surface 62 is intersected with tap drain 50.Specifically, for indicating 62 profile of top surface Straight line extended line with for indicating position that the line of 50 profile of tap drain intersects.Double-head arrow WW is from a side position PT to another The axial distance of side position PT2.Distance WW is also the length of top surface 62.Double-head arrow WB is the axial direction from position PT to the PB that demarcates Distance.

In this tire 102, the ratio of preferred distance WB and distance WW are 0.1 or more 0.4 or less.The ratio is set as 0.1 or more, facilitate connector 104 and is effectively discharged out air.Since the connector 104 limits side wall 56, to inhibit tap drain 50 metamorphosis.And the connector 104 is easily worked.Based on the viewpoint, being more highly preferred to the ratio is 0.20 or more. By the way that the ratio is set as 0.4 hereinafter, suitably maintaining the size of connector 104.It is used for since rubber is fully filled It is formed in the secondary groove of connector 104, therefore is not easy that the connector 104 is made to generate defect.Based on the viewpoint, preferably the ratio is 0.30 or less.The preferred ratio is 0.25.

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

In this tire 102, the ratio of optimized angle γ a and angle γ is 0.4 or more 0.6 or less.The ratio is set It is 0.4 or more, facilitates connector 104 and be effectively discharged out air.Since the connector 104 limits side wall 56, to inhibit main The metamorphosis of ditch 50.And the connector 104 is easily worked.Based on the viewpoint, be more highly preferred to the ratio be 0.45 with On.By the way that the ratio is set as 0.6 hereinafter, suitably maintaining the size of connector 104.Due to rubber be fully filled with In the secondary groove for forming connector 104, therefore it is not easy that connector 104 is made to generate defect.Based on the viewpoint, it is more highly preferred to the ratio Value is 0.55 or less.The preferred ratio is 0.50.

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

In this tire 102, the ratio of optimized angle η a and angle η are 0.4 or more 0.6 or less.The ratio is set as 0.4 or more, facilitate connector 104 and is effectively discharged out air.Since the connector 104 limits side wall 56, to inhibit tap drain 50 metamorphosis.And the connector 104 is easily worked.Based on the viewpoint, being more highly preferred to the ratio is 0.45 or more. By the way that the ratio is set as 0.6 hereinafter, suitably maintaining the size of connector 104.It is used for since rubber is fully filled It is formed in the secondary groove of connector 104, therefore is not easy that the connector 104 is made to generate defect.Based on the viewpoint, it is more highly preferred to the ratio Value is 0.55 or less.The preferred ratio is 0.50.

[embodiment]

In the following, illustrating effect of the invention using embodiment, but should not be solved with limiting according to the record of the present embodiment Release the present invention.

[embodiment 1]

Make 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.The first connector and the second connector are respectively arranged on each wear indicator.These It is indicated by " SC " in the column of the discharger of following tables 1.The specification of first connector and the second connector such as 1 institute of table Show.

[comparative example 1]

Comparative example 1 is conventional tire.The not set connector in the comparative example 1.These by following tables 1 discharge "-" in the column of device indicates.

[comparative example 2]

By not set connector and in a mold part corresponding with wear indicator setting gas vent and other then Mode same as Example 1 obtains the tire of comparative example 2.Using gas vent as discharger, and in the row of following tables 1 It is indicated in the column of device with " VP " out.

[comparative example 3]

Recess portion is set by not set connector and on wear indicator and other modes same as Example 1 obtain The tire of comparative example 3.Using recess portion as discharger, and indicated in the column of the discharger of following table 1 with " recess portion ".

[comparative example 4]

Protrusion is set by not set connector and on wear indicator and other modes same as Example 1 obtain The tire of comparative example 4.Such as the connector of embodiment 1, the side wall of the protrusion and tap drain is not connected.Using convex in comparative example 4 Portion is indicated as discharger, and in the column of the discharger of following table 1 with " protrusion ".

[embodiment 2-6]

By that will be used to indicate the radius of curvature R c1 of the edge contour circular arc of the first connector and the side of the second connector The radius of curvature R c2 of edge profile circular arc is set as described in Table 2 and other with the identical mode of embodiment 1 obtain comparative example The tire of 2-6.

[embodiment 7-10]

By the way that the thickness T2 of the thickness T1 of the first connector and the second connector are set as described in Table 3 and it He obtains the tire of comparative example 7-10 with the identical mode of embodiment 1.

[embodiment 10-14]

Other are same and the number of the number of the first connector and the second connector is set as described in Table 4 The identical mode of embodiment 1 obtains the tire of comparative example 11-14.

[generation of defect and flash]

Observation trial-production tire (10) by visual observation confirms the situation occurred of the defect and flash on wear indicator.It is logical The number and the total ratio of wear indicator for crossing the wear indicator that will confirm that defect occurs are calculated scarce as fraction defective It falls into.It is confirmed whether to generate flash.These results indicate in following table 1-4.The numerical value of fraction defective is smaller, inhibits defect It is better to occur.It is indicated when flash has flash generation then when no flash generates with " G " with " NG ".

[drainage performance]

Trial-production tire is assembled in regular wheel rim, and fills air to this tire and makes internal pressure 230kPa.By this tire Be installed on interior drum-type testing machine, and with load 5kN, 1 ° of drift angle on the wet bituminous pavement of depth of water 5mm implement running test.Meter Survey the generation of water surface slipping phenomenon.And using the result as exponential representation in following table 1-4.The number the big then with more excellent Good drainage performance.

[control stability]

Trial-production tire is assembled in regular wheel rim, and fill air to make the internal pressure 230kPa of this tire.This tire is pacified It is attached on the passenger car that capacity is 4300cc.Driver on racing car circuit by running the passenger car, to control stability It is evaluated.And using the result as exponential representation in following table 1 and table 4.The numerical value the big then better.In addition, in the evaluation In, trial-production tire is installed on the passenger car, the first end TE1 of tread surface is made to be located at the inside of the passenger car.Therefore, each First connector of wear indicator is located inside, width of second connector in the passenger car in the width direction of the passenger car Degree direction is located at outside.

[table 1]

1 evaluation result of table

[table 2]

2 evaluation result of table

[table 3]

3 evaluation result of table

[table 4]

4 evaluation result of table

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

[a possibility that being utilized in industry]

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

Claims (9)

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

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

The tap drain extended in the circumferential is carved on the tyre surface,

The depth of the tap drain is 6mm or more,

The depth of the width of the tap drain and the tap drain is same or the width of the tap drain is greater than the depth of the tap drain,

The ratio of the width of the tap drain and the width of the tread surface is 6% or more,

Wear indicator, wear indicator outside from the bottom of the tap drain to radial direction are provided in the tap drain It is prominent,

The connector of multiple film-forms is provided on the wear indicator, the connector is located at the wear indicator On the outside of radial direction, the connector is connect with the side wall of the wear indicator and the tap drain,

The multiple connector includes:

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

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

2. pneumatic tire according to claim 1, which is characterized in that

The connector has the edge being erected between the wear indicator and the side wall,

The profile at the edge is circular arc,

The radius of curvature of the circular arc is 4mm or more.

3. pneumatic tire according to claim 1 or 2, which is characterized in that

The connector with a thickness of 0.3mm or more 1.2mm or less.

4. pneumatic tire according to claim 1 or 2, which is characterized in that

Multiple connectors are provided on the wear indicator, these connectors are arranged at intervals in the circumferential, institute 2mm or more is divided between stating.

5. pneumatic tire according to claim 4, which is characterized in that

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

6. pneumatic tire according to claim 1 or 2, which is characterized in that

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

From the bottom of the tap drain to the enhancement layer with a thickness of 1.3mm or more.

7. pneumatic tire according to claim 1, which is characterized in that

The connector has the edge being erected between the wear indicator and the side wall,

The edge has two planes, these planes are arranged relative to the sidewall slope,

It is less than another plane and the side wall angulation close to a plane of the side wall and the side wall angulation.

8. a kind of for manufacturing the mold of pneumatic tire according to any one of claim 1 to 7, it is characterised in that:

Have circular mold cavity surface,

The mold cavity surface has the ridge extended in the circumferential,

The ridge has the main groove recessed from its top surface,

The main groove has from the further recessed secondary groove in its bottom,

The bottom of the main groove and the side of the ridge constitute angle,

The pair groove is located at the angle.

9. a kind of manufacturing method of pneumatic tire according to any one of claim 1 to 7, comprising:

Prepare the process of green tire；

By the process of green tire investment mold；

The process that the green tire is pressurizeed and heated in the mould；

The mold has circular mold cavity surface,

The mold cavity surface has the ridge extended in the circumferential,

The ridge has the main groove recessed from its top surface,

The main groove has from the certainly further recessed secondary groove in its bottom,

The bottom of the main groove and the side of the ridge constitute angle,

The pair groove is located at the angle.