CN101306631B

CN101306631B - Pneumatic belt tire

Info

Publication number: CN101306631B
Application number: CN2008100818791A
Authority: CN
Inventors: 富田达也; 原田备弘; 木胁幸洋; 内田和男
Original assignee: Bridgestone Corp
Current assignee: Bridgestone Corp
Priority date: 2007-05-17
Filing date: 2008-05-16
Publication date: 2012-07-04
Anticipated expiration: 2028-05-16
Also published as: JP2008308155A; JP5327944B2; KR20080101749A; CN101306631A; KR101482265B1

Abstract

The invention provides a pneumatic radial tire having cost competition and improving the bias abrasion performance to the tire shoulder by seeking for the optimization of the ground shape and the ground pressure. The pneumatic radial tire has a translot (2) having a plurality of circumferential main slots (1a, 1b) at the tread portion of the tire and extending along the width direction of the tire and a tread pattern for forming a plurality of ground lines (4a, 4b). In the tier shoulder ground line (4b) comprising ground end (E), a translot (2) extending from the circumferential main slots (1b) nearest to the ground end to the ground end (E) is stopped near the ground end, and continuous ground portions (L) are formed near the ground end. Side of the main slots (1b) of the tier shoulder ground line (4b) is approximately parallel to the intermittent slit auxiliary slot (3).

Description

Pneumatic belt tire

Technical field

The present invention relates to a kind of Pneumatic belt tire, relate to a kind of cost competitiveness that has in detail, seek simultaneously through ground connection shape and ground pressure are distributed suitableization, improve the Pneumatic belt tire that tire tire shoulder portion eccentric wear decreases performance.

Background technology

At present, known in air-inflation tyre have: for example, and as putting down in writing in the patent documentation 1; Through configuration bracing ply enhancement Layer between bracing ply and tyre surface; The centnifugal force that can suppress when running at high speed makes tread of tyre portion produce bigger radially increase distortion to the radial direction outside, therefore, can carry out thus usually: reduce heating and in the distortion of bracing ply end, improve the high speed durability; And, improve road-holding property.

But; Following tire is also less, higher in the competitive power aspect the cost because of not having bracing ply enhancement Layer number of components; Therefore still receive extensive employing now, this tire only is not embedded with steel wire bracing ply in the past (steel belt) structure (being designated hereinafter simply as " 2 steel wire belt structure ") that circumferentially constitutes to 2 bracing ply sheets of mutually opposite direction bevelled steel cord with respect to tire by portion within it for this bracing ply enhancement Layer is set.Particularly for the tire that is installed in the dimensions on miniature car, the compact automobile, the tire of this 2 steel wire belt structure has been adopted in each Automobile manufacturing commercial city, pays attention to have higher competitive power aspect our becoming.

Patent documentation 1: TOHKEMY 2005-112065 communique

But; The tire of 2 steel wire belt structures because the reason of manufacture view and endurance quality aspect, bracing ply width than ground connection narrow width; Therefore; Near the bracing ply end of tire shoulder portion, can not come the radial deformation of check strap bundle synusia (ply) to increase, thereby can't avoid making tyre surface to the problem that radially increases distortion significantly because of the centnifugal force in running at high speed by bracing ply.Have following problems: if it is bigger radially to increase distortion in tire shoulder portion like this, it is poor then between tire shoulder portion and pars intermedia, to produce girth, and the tire shoulder eccentric wear that takes place to be caused by go (driving) in the long tire shoulder portion of girth decreases.

In addition, in 2 steel wire belt structures, possible: because of not being provided with cover (cap), layer bracing ply enhancement Layers such as (layer), bracing ply bends, and in ground plane, produces the friction that shoulder area (shoulder block) is involved in to the inside.Produced the shearing stress of tire width direction by this wipe contact, this also becomes the inclined to one side worn-down reason of generation tire shoulder.

Therefore, the object of the present invention is to provide a kind of cost competitiveness that has, and seek to decrease the Pneumatic belt tire of performance through the eccentric wear that makes suitableization of ground connection shape and ground pressure distribution improve the tire shoulder.

Summary of the invention

People of the present invention have carried out deep research for solving above-mentioned problem, and the result finds can reach above-mentioned purpose through the tread contour and the belt structure that adopt regulation, and then has accomplished the present invention.

That is, Pneumatic belt tire of the present invention be a kind of have at the tire path face have a plurality of circumferential major troughs and translot that extends along tire width direction roughly and the Pneumatic belt tire that forms the tread contour of a plurality of grounding parts row, it is characterized in that,

In comprising the tire shoulder portion grounding parts row of ground connection end, from the translot that extends to the ground connection end, end near the ground connection end, and near this ground connection end, form circumferentially continuous grounding parts near the circumferential major trough of ground terminal; And, have and the secondary groove of the interrupted slit of major trough almost parallel in the major trough side of these tire shoulder portion grounding parts row.

In Pneumatic belt tire of the present invention, preferably, the well width of the translot of above-mentioned tire shoulder portion grounding parts row is along with going to reduce gradually from a side direction end side that is communicated with major trough.In addition, preferably: having carcass plies and bracing ply, turns back and extension in the form of a ring around bead core in the Width both ends of this carcass plies; This bracing ply is disposed at the radial direction outside of this carcass plies; And; Be embedded with respect to tire by inside and circumferentially constitute to 2 bracing ply sheets (belt ply) of mutually opposite direction bevelled steel cord, this tire does not have the bracing ply protective cover that is used to protect this bracing ply.In addition, preferably: the crown radius of curvature R 1 of above-mentioned tire shoulder portion is more than 500 mm, and the radius of curvature R 2 of the ground connection end of above-mentioned tire shoulder portion is below 20 mm.

Pneumatic belt tire of the present invention can be possessed cost competitiveness, and, can seek to decrease performance through suitableization that ground connection shape and ground pressure are distributed, the eccentric wear that improves the tire shoulder.

Description of drawings

Fig. 1 expansion drawing that to be expression launched the tread of tyre portion of a preferred implementation of the present invention.

Fig. 2 is the Width cutaway view of expression tire shown in Figure 1.

Fig. 3 be expression will be in the past the expansion drawing launched of the tread of tyre portion of example 1.

Fig. 4 expansion drawing that to be expression launched the tread of tyre portion of a preferred implementation of the present invention.

Fig. 5 be expression will be in the past the expansion drawing launched of the tread of tyre portion of example 2.

Fig. 6 is the scheme drawing of expression wearing and tearing energometry method.

Fig. 7 is the diagram of curves of expression A～G wearing and tearing energy distribution of ordering.

Fig. 8 is the diagram of curves of the wearing and tearing average energy at expression pars intermedia and tire shoulder portion place.

Fig. 9 is the diagram of curves of expression pars intermedia and the wearing and tearing ratio of tire shoulder portion.

Figure 10 representes the diagram of curves that the height wear hardness of tire shoulder portion end is estimated.

The specific embodiment

Below, embodiment of the present invention is specified.

Fig. 1 figure that to be expression launched the fetus face of the Pneumatic belt tire (being designated hereinafter simply as " tire ") 10 of a preferred implementation of the present invention.In tire 10 of the present invention, have many at the facial T of tire path, be 3 circumferential major trough 1a, 1b and the translot 2 that roughly extends along tire width direction in graphic preference and form many row's grounding parts row (pars intermedia grounding parts row 4a, the grounding parts row 4b of tire shoulder portion).

At this; In the present invention; Key is: in comprising the grounding parts row 4b of tire shoulder portion of ground connection end E, near the circumferential major trough 1b of ground terminal near the translot 2 that ground connection end E extends ends at ground connection end E, and near the E of this ground connection end, form along circumferential continuous grounding parts L.Preferably, the well width of the translot 2 of tire shoulder portion grounding parts row 4b is along with going from the side that is communicated with major trough 1b to end side 9 and reducing gradually.

Make the grounding parts row 4b of tire shoulder portion that comprises ground connection end E form continuous grounding parts L through making translot 2 not exclusively pass ground connection end E; Therefore; Make approaching each block (block) constraint each other in the grounding parts row 4b of tire shoulder portion; Consequently, feasible so-called height abrasion (heel and toe) worn-down generation partially that can be suppressed at the E place, ground connection end of the grounding parts row 4b of tire shoulder portion.

In addition, preferably: make the groove width of the translot 2 of the grounding parts row 4b of tire shoulder portion, along with going from a side direction terminal 9 sides that are communicated with major trough 1b and reduce gradually, thus, make that each the approaching block in the grounding parts row 4b of tire shoulder portion retrains more each other.

In addition, as shown in the figure in the present invention, key is: the major trough 1b side at the grounding parts row 4b of tire shoulder portion has and the secondary groove 3 of the interrupted slit of major trough 1b almost parallel.Through making the inboard exapnsion of the secondary groove 3 of the slit of rubber in being arranged at shoulder area, thereby the tread-rubber of tire shoulder portion is compressed and elongated to the circumferential expansion ground contact length can prevent because of ground connection the time.

Then, the cross-sectional configuration of expression tire 10 in Fig. 2.As shown in Figure 2; Tire 10 has pair of bead portion 13, sidewall portion 14 and fetus face 15; This pair of bead portion 13 is embedded with bead core 12 respectively; This sidewall portion 14 extends to the outside of radial direction roughly from this a pair of bead part 13 respectively, and this fetus face 15 is cylindric for roughly, and interconnects with each radial direction outer ends of these sidewall portions 14.

In addition, this tire 10 has the carcass plies 16 that between bead core 12, extends in the form of a ring and be used to strengthen sidewall portion 14 and fetus face 15, and the Width both ends of this carcass plies 16 are around above-mentioned bead core 12, side direction is turned back outside axially in axially.Carcass plies 16 is by being that 2 casingply sheets (carcassply) 17,18 constitute among at least 1, graphic preference; In these

casingply sheets

17,18, be embedded with many body cords that are parallel to each other (carcass cord) respectively, these many body cords that are parallel to each other are made up of organic fiber cord such as the nylon that circumferentially becomes the angle of cord of 60～90 degree to intersect, promptly extend along meridian direction (meridian direction) with respect to tire, aromatic polyamide or steel cord.

At the radial direction of carcass plies 16 outside configuration bracing ply 20, this bracing ply 20 by will at least 2 bracing ply sheets (belt ply), be preferably the 2 steel wire belt structures formation that 2 bracing ply sheets of range upon range of inboard bracing ply sheet 21 as shown in the figure and outside bracing ply sheet 22 form.

At this, bury many steel cords that are parallel to each other respectively underground in the inside of each

bracing ply sheet

21,22, these steel cords are made up of twisted cable or monofilament.And 2

bracing ply sheet

21,22 interior steel cords circumferentially tilt in the opposite direction, also intersect each other with respect to tire.The angle of imbedding of the steel cord in the

bracing ply sheet

21,22 is preferably with respect to circumferential one-tenth 10 degree of tire～40 degree.

Of above-mentioned preference, through adopting the 2 known steel wire belt structures that do not have the bracing ply protective cover, a kind of tire that aspect cost, has strong competitive power can be provided.

And in preference of the present invention, preferably: the crown radius of curvature R 1 of tire shoulder portion 23 is more than the 500mm, and the radius of curvature R 2 of the ground connection end 24 of tire shoulder portion 23 is below the 20mm.Like this, bigger through the crown radius of curvature R 1 that makes tire shoulder portion 23, the ground plane that makes tire shoulder portion quickly with road surface ground connection; On the other hand; The radius of curvature R 2 of the ground connection end 24 through making tire shoulder portion 23 is less, makes ground pressure concentrate on this end, consequently; Can be through manifesting bigger friction force, become prevention and suppress friction (wiping) to the interceptor (stop) of the shearing of tire width direction.

In addition, in the present invention, only otherwise damage functions such as above-mentioned groove, belt structure, can various grooves or tire sipe be set at tyre surface.In graphic preference, the secondary groove 7 of bending slit that in pars intermedia grounding parts row 4a, is formed with translot 6 and is connected with this translot 6.And, being formed with secondary groove 3 of interrupted slit and the secondary groove 5 of slit at the grounding parts row 4b of tire shoulder portion, the secondary groove 5 of this slit is connected with this interrupted slit pair groove 3 in the roughly pars intermedia of the secondary groove 3 of this interrupted slit direction along approximate vertical.And, be formed with short translot 8 at the ground connection end E of the grounding parts row 4b of tire shoulder portion.

Embodiment

Below, based on embodiment, the present invention is specified.

Embodiment 1

Manufactured experimently out the tire that has tread contour shown in Figure 1 and 2 steel wire belt structures and satisfy following condition.

Tire size specification: 155/65R13 73S

Tread width TW:120mm

The ratio (negative rate) of groove and pattern block area: 32%

The width of circumferential major trough 1a: 18mm, the width of 1b: 9.1mm

The degree of depth of circumferential major trough 1a, 1b: 6.0mm

The width of the part that is connected with circumferential major trough 1b of translot 2: 2.5～4.5mm (changing) with spacing

The degree of depth of translot 2: 5mm

The width w:5mm of grounding parts L

The width of the secondary groove 3 of interrupted slit: 1.5mm

The degree of depth of the secondary groove 3 in interrupted slit: 5mm

Radius of curvature R 1:1000mm

Radius of curvature R 2:5mm

In the past the example 1

Employing have tread contour shown in Figure 3 and 2 steel wire belt structures and satisfy the known tire of following condition, as example 1 in the past.

Tire size specification: 155/65R 1373S

Tread width: 110mm

The ratio of groove and pattern block area: 28%

Radius of curvature R 1:90mm

Radius of curvature R 2:17mm

Evaluation method

In this evaluation method, wheel rim (rim) size is made as 4.00B * 13, and interior pressure is based on setting with the corresponding air pressure of the size-load-bearing capacity synopsis of the radial-ply tyre of being stipulated by JATMAYEAR BOOK (1992 Japanese car tire association criterions).

The mounting of tyre that supplies test usefulness on actual vehicle, is carried out going of operating range 7500km on the spot, following assessment item is made an experiment.

1) ratio of the tire shoulder portion in the front-wheel and the abrasion loss of pars intermedia (wearing and tearing than)=tire shoulder portion abrasion loss/pars intermedia abrasion loss (for more near 1, wear and tear even more)

2) shoulder area enter into side with pedal out the height residual quantity (difference of height is more little good more) that the height residual quantity of side=height wears and tears

The result of gained is shown in the following table 1.

Table 1

?	In the past the example 1	Embodiment 1
			Pars intermedia abrasion loss (mm)	0.85	1.29
Tire shoulder portion abrasion loss (mm)	1.65	0.83
			The wearing and tearing ratio	1.94	0.64

The height residual quantity (mm) of height abrasion

2.5

0.5

Evaluation result according to table 1 can be confirmed: the tire of embodiment 1 compares, has that higher anti-tire shoulder two shoulders peel off polishing machine and anti-height abrasion eccentric wear decreases performance with example 1 tire in the past.

Embodiment 2

Manufactured experimently out: except having tread contour shown in Figure 4 and 2 steel wire belt structures, also have 1 layer bracing ply enhancement Layer and satisfy the tire of following condition.

Tire size specification: 195/65R15 91H

Tread width TW:140mm

The ratio of groove and pattern block area: 34%

The width of circumferential major trough 1a: 9mm, the width of 1b: 10.5mm

The degree of depth of circumferential major trough 1a, 1b: 7.5mm

The width of the part that is communicated with circumferential major trough 1b of translot 2: 2.5～4.5mm (changing) with spacing

The degree of depth of translot 2: 5mm

The width w:5mm of grounding parts L

The width of the secondary groove 3 of interrupted slit: 2mm

The degree of depth of the secondary groove 3 of interrupted slit: 6mm

Radius of curvature R 1:145mm

Radius of curvature R 2:36mm

In the past the example 2

Adopting in the example 2: have tread contour shown in Figure 5 and 2 steel wire belt structures and 1 layer of bracing ply enhancement Layer and satisfy the known tire of following condition in the past.

Tire size specification: 195/65R15 91H

Tread width: 140mm

The ratio of groove and pattern block area: 34%

The width of circumferential major trough 1a: 9mm, the width of 1b: 10.5mm

The degree of depth of circumferential major trough 1a, 1b: 7.5mm

The degree of depth of translot 2: 5mm

Radius of curvature R 1:145mm

Radius of curvature R 2:36mm

Wearing and tearing energometry method

Fig. 6 is the scheme drawing of expression wearing and tearing energometry method.Adopt following method to measure: the wearing and tearing energy that embodiment 2 and A～G routine 2, on Fig. 4 and the tire 30,31 shown in Figure 5 are in the past ordered.A and B are the points of tire shoulder portion end (SHO2) of tire, and C～E is the point of the tire shoulder portion inboard (SHO1) of tire, and F and G are the points of the pars intermedia (CL) of tire.

1) point of establishing in the middle of A～G point on Fig. 4 and the tire 30,31 shown in Figure 5 that will test is Y, and this Y point is set at: when on test desk 32, rolling, pass through the X point on the test desk 32.

2) tire 30,31 is rolled with speed per hour 0.2km/h; Power in the local time that use being imbedded Y point on the 3 component sensor determination tires 30,31 at X point place and is pressed in X; And; The skew (amount of exercise) of using non-contact optical formula movable sensor ((strain) used the instrumentation institute system) to observe Y that tire is pedaled out moment order, measure the wearing and tearing energy (unit: J/m), obtain wearing and tearing than (more near 1, can prevent that eccentric wear from decreasing more) and the energy that weares and teares in the difference (unit: J/m) that enters into when pedaling out.

The result who is obtained is shown in Fig. 7～10.

Fig. 7 is the diagram of curves of expression A～G wearing and tearing energy distribution of order, and Fig. 8 is the diagram of curves of aviation value of representing the wearing and tearing energy of pars intermedia and tire shoulder portion.Among Fig. 7, O representes embodiment 2, and ▲ expression is example in the past.In Fig. 8, blank post bar is represented embodiment 2, and oblique line is partly represented example 2 in the past.In Fig. 7, at pars intermedia (F and G point), the difference of wearing and tearing energy is less, but in tire shoulder portion, in embodiment 2, the difference of wearing and tearing energy is less, relative therewith, and in example 2 in the past, wearing and tearing energy difference is bigger, and at A and B point, this difference is remarkable especially.In addition, in Fig. 8, at pars intermedia (some F and G), the difference of the wearing and tearing energy in embodiment 2 and the example 2 in the past is less; But tire shoulder portion (A～E), embodiment 2 and in the past the wearing and tearing energy in the example 2 bigger difference is arranged.

Fig. 9 is the diagram of curves of expression pars intermedia and the wearing and tearing ratio of tire shoulder portion.Expression wearing and tearing provide protection against wear than more near 1 more, and these wearing and tearing are than being that the aviation value of wearing and tearing energy of tire shoulder portion is with respect to the ratio of the aviation value of the wearing and tearing energy of pars intermedia.As shown in Figure 9, the wearing and tearing ratio among the embodiment 2 is 1.25, and is relative therewith, and in example 2 in the past, wearing and tearing are than being 1.79, and the tire that shows embodiment 2 is than routine 2 tire more can be anti-attrition in the past.

Figure 10 representes the diagram of curves that the height Abrasion performance of tire shoulder portion end is estimated.If the wearing and tearing energy that B is ordered is (EW2), and establishes the wearing and tearing energy that A orders and be (EW1), obtain wearing and tearing energy enter into poor (J/m) when pedaling out with EW2-EW1.In embodiment 2, this difference is 0.02 * 10 ³(J/m), relative therewith, in the past the example 2 in, this difference is 0.15 * 10 ³(J/m).

Evaluation result according to Fig. 7～10 can be confirmed: the tire of embodiment 2 is compared with example 2 tire in the past, has that higher anti-tire shoulder two shoulders peel off polishing machine and anti-height abrasion eccentric wear decreases performance.

Claims

1. Pneumatic belt tire has at the tire path face and has a plurality of circumferential major troughs and translot that extends along tire width direction roughly and the tread contour that forms a plurality of grounding parts row, it is characterized in that,

In comprising the tire shoulder portion grounding parts row of ground connection end; Near ending at the ground connection end from the translot that extends to the ground connection end near the circumferential major trough of ground terminal; And near this ground connection end, form along circumferential continuous grounding parts; And, have and the secondary groove of interrupted slit of major trough almost parallel in the major trough side of this tire shoulder portion grounding parts row.

2. Pneumatic belt tire according to claim 1 is characterized in that, the well width of the translot of above-mentioned tire shoulder portion grounding parts row is along with going from a side direction end side that is communicated with major trough and diminishing gradually.

3. Pneumatic belt tire according to claim 1 and 2 is characterized in that, has carcass plies and bracing ply, and the Width both ends of this carcass plies are turned back, extended in the form of a ring around bead core; This bracing ply is disposed at the radial direction outside of this carcass plies; And; Be embedded with respect to tire by inside and circumferentially constitute to 2 bracing ply sheets of mutually opposite direction bevelled steel cord, this Pneumatic belt tire does not have the bracing ply protective cover that is used to protect this bracing ply.

4. Pneumatic belt tire according to claim 3 is characterized in that, the crown radius of curvature R 1 of above-mentioned tire shoulder portion is more than the 500mm, and the radius of curvature R 2 of the ground connection end of above-mentioned tire shoulder portion is below the 20mm.