CN100400315C

CN100400315C - Aeration tyre

Info

Publication number: CN100400315C
Application number: CNB021429162A
Authority: CN
Inventors: 石田昌宏
Original assignee: Yokohama Rubber Co Ltd
Current assignee: Yokohama Rubber Co Ltd
Priority date: 2001-06-06
Filing date: 2002-06-06
Publication date: 2008-07-09
Anticipated expiration: 2022-06-06
Also published as: CN1406778A; GB0212787D0; GB2376217B; KR20020093583A; GB2376217A; TW530012B; KR100838506B1

Abstract

Six block rows extending in a tire circumference direction are formed by a central narrow groove, side main grooves and left and right lug grooves in a tread surface, the rotating direction of which is specified to one direction. The average tire circumference direction length of the blocks of the block rows in the center area of the tread surface is 4 to 5 % of the tire full circumference length on the tire center line. Each of the left and right lug grooves is formed as a tapered groove having wider groove width at the tire center line. Left and right main groove portions located between the lug grooves are formed as inclined grooves inclining so as to expand towards the reverse direction to the rotating direction of the tire. Subgrooves crossing the blocks in the tire width direction are formed on the surfaces of the blocks in the shoulder areas.

Description

Air-inflation tyre

Technical field

The present invention relates to air-inflation tyre, in more detail, the present invention relates to keep noise performance and anti-eccentric wear and decrease performance and can improve the performance (rideability of dry pavement) when dried and the air-inflation tyre of the performance (wet road rideability) when wet simultaneously.

Background technology

That air-inflation tyre with block-type tread is very difficult to realize performance when wet and noise performance and deposit, wherein, the block-type tread in this air-inflation tyre is by the linearity major trough that extends along tire circumferential direction at tyre surface and marks off a plurality of projections along the tread groove of tire width direction and form.That is, the performance when wetting in order to improve must be widened groove width.As a result, owing to increase the deterioration that groove area can cause noise performance.On the other hand, in order to improve noise performance, must make the narrowed width of groove.As a result and since groove area reduce then can cause drainage effect to worsen, thereby reduced the performance when wet.Therefore, in the air-inflation tyre that in the past has block-type tread, the relation that there are the second order inverse ratio in performance when wet and noise performance, that is, one improves, and another can worsen on the contrary, and one improves, and another can reduce on the contrary.

As having the airtyred of above-mentioned block-type tread, for example, in USP No.5567253, a kind of like this air-inflation tyre is disclosed: on the line of centers that is provided with on the tyre surface of having specified the tyre rotation direction with a direction at tire, along 1 stria of tire circumferential direction with the linearity extension, on the other hand, the both sides of the tire width direction of this stria formed extend along tire circumferential direction about 2 major troughs, along tire circumferential direction, be provided with from two outsides of described stria with prescribed distance to tire width direction, towards with tyre rotation side's left and right sides tread groove of diagonally extending in the opposite direction, by described stria, the central part that major trough and tread groove make the projection that extends along tire circumferential direction be listed in described tyre surface forms 4 row, is provided with along the secondary groove of this projection of tire width direction crosscut at the lug surface of described left and right sides tire shoulder portion.

Therefore,, proposed such technical scheme, that is: replaced above-mentioned major trough as above-mentioned countermeasure, at tyre surface with the spacing of regulation, V-shaped valley is set along the circumferencial direction of tire.Guarantee good drainage performance with this, reduce the gas column sonorant simultaneously, improve near the noise of 1KHz.But opposite with it, the problem of existence is: can cause the anti-eccentric wear damage mis-behave of dividing the projection that forms by V-shaped valley.

Summary of the invention

The object of the present invention is to provide such air-inflation tyre, this tire can be kept noise performance and anti-eccentric wear damage performance with the level that is higher than in the past, improves the performance when wetting simultaneously, and improves the performance when doing.

Realize of the present invention airtyred being characterised in that of above-mentioned purpose: on the line of centers that is provided with on the tyre surface of having specified the tyre rotation direction with a direction at tire, along 1 stria of tire circumferential direction with the linearity extension, on the other hand, the both sides of the tire width direction of this stria formed extend along tire circumferential direction about 2 major troughs, along tire circumferential direction, be provided with from two outsides of described stria with prescribed distance to tire width direction, towards with tyre rotation side's left and right sides tread groove of diagonally extending in the opposite direction, by described stria, major trough and tread groove make central part formation 4 row that are listed in described tyre surface along the projection of tire circumferential direction extension, form 1 row respectively at left and right sides tire shoulder portion place, lug surface in described left and right sides tire shoulder portion is provided with along the secondary groove of this projection of tire width direction crosscut, at the average tire circumferential lengths of the projection at the projection row place of the described central part 4-5% that is the tire circumference on the tire line of centers, described left and right sides tread groove with its groove width at the centerline side broad of tire and form the groove that successively decreases in the tire shoulder portion narrower mode of side, make the circumferencial direction that is positioned at along described tire, form tipper with the left and right sides major trough portion between the tread groove of prescribed distance configuration, this tipper tilts in the mode that court and tyre rotation side expand in the opposite direction, and in 1 week along whole tire, launch described tyre surface along tire circumferential direction, when this tire circumferential direction is observed described major trough, connect described tipper to constitute described major trough, so that can from one of this major trough circumferentially end to another circumferential end can see this major trough always, be provided with along the secondary groove of this projection of tire width direction crosscut at the lug surface of described left and right sides tire shoulder portion.

Like this, because the average tire circumference of the projection of tyre surface central part is the 4-5% of tire circumference, therefore the length that increases projection compared with the past, can increase the projection length at central part place.So, can improve the performance when doing.

In addition, since make the tread groove form towards with tyre rotation side's bevelled tipper in the opposite direction, increased the width of tread groove at the central part that drainage performance is had considerable influence, therefore, in the past the tire identical with groove area compared, and can improve the performance when wetting.

As mentioned above, central part at tyre surface, though owing to increase the average tire circumference of projection on the one hand, the reason that enlarges the groove area of tread groove on the other hand can cause the increase of noise, but, owing to make the left and right sides major trough that marks off by left and right sides tread groove partly form tipper, therefore, reduce the gas column sonorant that produces by major trough, improved near the noise of 1KHz.

In addition, because in tire shoulder portion, mark off less projection by secondary groove, therefore, the joint number at the tire shoulder portion place that is formed by described secondary groove and tread (ラグ) groove comes down to 2 times of joint number at central part place, since different in tire shoulder portion with the joint number at central part place, therefore, help to realize the white noiseization of spacing noise.

And,, therefore, can reduce the noise of bleeding that produces at tire shoulder portion place that causes because of left and right sides tread groove because the groove width of left and right sides tread groove reduces gradually towards the tire width direction outside.

Therefore, can remedy to the increase that improves performance when doing and performance causes noise when wet, to keep noise performance with identical in the past level.

In addition, because with identical in the past, be arranged on stria on the tyre surface and major trough and come down to extend with linearity and be provided with, therefore, can not cause being provided with the deterioration of anti-inclined to one side wearability of the tire of V-shaped groove along the circumferencial direction of tire.

Description of drawings

For a more detailed description with reference to accompanying drawing to most preferred embodiment of the present invention, wherein;

Fig. 1 is the main portion expansion drawing of the tyre surface of an embodiment of demonstration air-inflation tyre of the present invention.

The specific embodiment

In air-inflation tyre shown in Figure 1, on the tire centre line C L of the tyre surface 1 of having specified the tire hand of rotation along the direction shown in the arrow R, be provided with 1 stria 2 that extends with linearity, along tire circumferential direction T.On the tyre surface 1 of the tire width direction both sides of stria 2, along the Width of tire, with prescribed distance form extend along tire circumferential direction T about 2

major troughs

3,4.

Along tire circumferential direction T, with the prescribed distance setting from stria 2 towards tire width direction two left and right sides tread grooves 5 that extend in the outside.Divide on tyre surface 1 by these strias 2,

major trough

3,4 and tread groove 5 and to have formed a plurality of projections 6.These projections 6 are divided into the 6 row projections row that along the circumferential direction extend by stria 2 and left and right sides major trough 3,4.2 row projection row X1 about the central part 1A of the tyre surface between the left and right sides major trough 41 is respectively equipped with, X2 is respectively equipped with 1 row projection row X3 at the left and right sides in left and right sides major trough 4 outsides tire shoulder 1B.

By each major trough part 3a about each tread groove 5 divisions of the left and right sides, 4a is made of tipper, and these tippers have the directivity that enlarges towards the direction opposite with tyre rotation direction R.In described slant range, along whole 1 week of tire, with tire circumferential direction T expansion tyre surface 1, watching major trough 3 from the circumferencial direction of tire, 4 o'clock, can see another circumferencial direction end from a circumferencial direction end of

major trough

3,4, in the scope of seeing through (シ-ス Le-) state as what is called always,

major trough

3,4 just become connect have the tipper of above-mentioned directivity and constitute see through groove.

Left and right sides tread groove 5 be from stria 2 to the reverse side bevelled tipper of tyre rotation direction R.Described tipper is so that the circular-arc formation of reverse side projection.Tread groove 5 is set so that its about only be offset specified length along tire circumferential direction T, therefore asymmetric with respect to the tire centre line C L.The groove width of each tread groove 5 is at tire centre line C L side broad, and is narrower in tire shoulder 1B side, thereby forms the groove that successively decreases that reduces gradually from tire centre line C L side direction tire width direction outside width.

The projection row X1 of central part 1A, the 4-5% that the average tire circumferential direction length range of the tire circumferential direction length L of the projection 6A among the X2 is the tire circumference on the tire centre line C L (total joint number in 1 week of tire is essentially 20-25), the tire circumference length L of the projection 6A of central part 1A is longer than in the past.Therefore, the groove width that should increase above-mentioned tread groove 5 at central part 1A can obtain the higher projection rigidity of tire circumferential direction simultaneously to guarantee to form the groove area of broad.

Surface at each projection 6B of left and right sides tire shoulder 1B forms 1 secondary groove 7, and transversal tire direction is with projection 6B1 less before and after described projection 6B is divided into.Described secondary groove 7 extends to the projection 6A with the projection row X2 of the central part 1A of the projection row X3 adjacency of tire shoulder 1B.In the drawings, though the inner 7a of secondary groove 7 is positioned at projection 6A, secondary groove 7 is communicated with

major trough

3,6A is divided into the front and rear part with projection.

Like this, in the present invention, the average tire circumference of the projection 6A at central part 1A place is the 4-5% of tire circumference, since compared with the past, projection 6A increased, therefore, increased the rigidity of central part 14 place's projections.As a result, can improve performance (maneuvering performance and deceleration and stopping performance) when doing.

In addition, since exist make tread groove 5 to tyre rotation direction R reverse side bevelled tipper, at the width of the central part 1A place enlarged slot that drainage is had a significant impact, therefore, compare with tire in the past, can improve the performance when wetting with same groove area.

As mentioned above, the average tire circumference of projection 6A owing to extended, and widened the groove area of the tread groove 5 at central part 1A place, therefore, though because this reason can increase noise, but owing to make the left and right sides major trough part 3a that divides by

tread groove

5,4a forms tipper, therefore, has reduced at major trough 3, the gas column sonorant that causes in 4 has improved near the noise of 1KHz.

Owing to the projection 6B of tire shoulder 1B is divided into small lugs 6B1 by secondary groove 7, therefore, joint number in the tire shoulder 1B that is formed by secondary groove 7 and tread groove 5 is essentially 2 times of joint number of central part 1A, because tire shoulder 1B is different with the joint number of central part 1A, therefore, help to realize the white noiseization (dispersion of occurrence frequency) of spacing noise.

And, because the groove width that makes left and right sides tread groove 5 narrows down gradually to the tire width direction outside, therefore, can be reduced in the noise of bleeding among the tire shoulder 1B that tread groove 5 places cause.

Therefore, offset the deterioration of the formed noise of improvement of the performance followed when doing and the performance when wet.

Because with the same in the past, make the stria 2 that is arranged on the tyre surface 1 and

major trough

3,4 along tire circumferential direction T, dispose in fact with linearity, therefore, can not cause the deterioration of anti-inclined to one side wearability.

Owing to when the average tire circumferential direction curtailment 4% of projection 6A, then can reduce the noise of projection, therefore, be difficult to improve effectively the performance when doing.Opposite if surpass 5%, then can cause noise performance to worsen.

If tread groove 5 is not the above-mentioned groove that successively decreases, but the certain groove of well width then can not improve the performance when wetting effectively, and then can cause the deterioration of noise performance.

In the present invention, the groove width of above-mentioned stria 2 is 1-5mm.If groove width less than 1mm, then can make drainage worsen.On the contrary, if greater than 5mm, then can increase the noise that produces by the gas column sympathetic response.

Therefore left and right sides tread groove 5, can be provided with transformable spacing along the circumferencial direction of tire owing to can make the spacing noise produce white noiseization.In this case, be provided with secondary groove 7 different with central part 1A to form, be the spacing type of 2 times of its spacing length numbers (spacing type), with this can be better the white noiseization of ground realization spacing noise.

All groove with identical in the past, is 26%-36% with respect to the groove area ratio of tyre surface 1.

Though the present invention can be ideally suited for the used air-inflation tyre of passenger carrying vehicle especially, should not be limited to this.

Embodiment

All the tire size that adopts is 225/45ZR17, make its structure respectively and have the average tire circumference of central part projection that table 1 is put down in writing, shown in Figure 1 and tire 1-2 of the present invention and the comparative tire 1-4 and the tire in the past of tread groove, in described tire in the past, by having formed block-type tread along the linearity major trough of tire circumferential direction extension and the tread groove that extends along tire width direction at tyre surface.

In tire 1-2 of the present invention and comparative tire 1-4, the groove width of stria is 3mm, and the groove area ratio is 33%.In addition, in the past the average tire circumference of the projection in the tire be on the tire line of centers tire circumference 3.5%, the groove area ratio is 33%.

Described each test tire is assemblied on the wheel rim that rim size is 17 * 7 1/2JJ, be assemblied on the vehicle of free air capacity 2500cc after making air pressure reach 220kPa, the ranking test of the performance when utilizing test condition shown below to do, performance, noise performance and abrasion resistance properties when wetting is to obtain the result shown in the table 1.

Performance when doing

Road-holding property

In the test mode of main line, carry out the test that provides of road-holding property by test driver 5 people, evaluate its result with tire in the past as 100 index.Its value is big more, and the road-holding property when doing is just good more.

Braking ability

In the test mode of main line,, evaluate its result as 100 index with tire in the past by the stopping distance of the velocity determination glancing impact of 100km/h.Its value is big more, and the braking ability when doing is just good more.

Performance when wet

Road-holding property

In wet drive test examination mode, carry out the test that provides of road-holding property by test driver 5 people, evaluate its result with tire in the past as 100 index.Its value is big more, and the road-holding property when wet is just good more.

Braking ability

In the wet drive test examination mode of the about 3mm of the depth of water,, evaluate its result as 100 index with tire in the past by the stopping distance of the velocity determination glancing impact of 100km/h.Its value is big more, and the braking ability when wet is just good more.

Drainage during craspedodrome

On the wet road surface of depth of water average out to 10mm, travel and during flat-out acceleration, measure the speed that water surface skidding takes place, evaluate its result as 100 index with tire in the past.Its value is big more, and the drainage during craspedodrome is just good more.

The turning drainage

With certain speed, turn with the circle of radius 100m stable after, on the wet road surface of depth of water average out to 10mm, during flat-out acceleration, measure speed and the peak acceleration of this moment that water surface skidding takes place, evaluate its result with tire in the past as 100 index.Its value is big more, and the drainage during turning is just good more.

Noise performance

On the road surface of mating formation, the figure noise when measuring with speed per hour 60km/h straight-line travelling adopts in the past tire to evaluate its result as 100 index.Its value is big more, and the drainage during turning is just good more.

Anti-inclined to one side wearability

On the road surface of mating formation, travelled behind 10,000 km with the average velociity of 40km/h, measure the poor of projection greatest wear amount and minimal wear amount, evaluate its result with tire in the past as 100 index.Its value is big more, and anti-inclined to one side wearability is just good more.

Above-mentioned each exponential quantity just produces effect greater than 105, if 96-104 then effect with identical in the past.

[table 1]

As shown in Table 1, tire of the present invention can be kept noise performance and abrasion resistance properties with the level that is higher than in the past, has improved performance when wet and the performance when dried simultaneously.

In above-described the present invention, because the average perimeter of the projection of tyre surface central part is longer than in the past, the projection rigidity of central part is higher, therefore, can improve the performance when doing.

In addition and since make tread groove 5 form to tyre rotation direction opposite sense bevelled tipper, and widened its groove width at the central part place, therefore, can improve the performance when wet.

And, owing to reduced the noise that the groove area of the average tire circumference of the projection by increasing the tyre surface central part and tread groove worsens, and make left and right sides major trough partly form tipper to reduce the gas column sonorant, in addition, by secondary groove being set in tire shoulder portion so that the spacing noise is realized white noiseization, and then by making tread groove formation successively decreasing groove to reduce and to offset the noise of bleeding that produces in tire shoulder portion, therefore, can be to keep noise performance with identical in the past level.

Because with identical in the past, adopted in fact along the circumferencial direction of tire to make the stria and the major trough that are arranged on tyre surface extend the structure that is provided with rectilinear form, therefore, the anti-inclined to one side wearability that can not cause being provided with the tire of V-shaped groove worsens.

Claims

1. air-inflation tyre, wherein, on the line of centers that is provided with on the tyre surface of having specified the tyre rotation direction with a direction at tire, along 1 stria of tire circumferential direction with the linearity extension, on the other hand, the both sides of the tire width direction of this stria formed extend along tire circumferential direction about 2 major troughs, along tire circumferential direction, spacing with regulation is provided with from two outsides of described stria to tire width direction, towards with tyre rotation side's left and right sides tread groove of tiltedly extending of inclination in the opposite direction, by described stria, major trough and tread groove make central part formation 4 row that are listed in described tyre surface along the projection of tire circumferential direction extension, form 1 row respectively at left and right sides tire shoulder portion place, lug surface in described left and right sides tire shoulder portion is provided with along the secondary groove of this projection of tire width direction crosscut

It is characterized in that:

At the average tire circumferential lengths of the projection of the projection of the described central part row 4-5% that is the tire circumference on the tire line of centers,

Described left and right sides tread groove with its groove width at the centerline side broad of tire and form the groove that successively decreases in the tire shoulder portion narrower mode of side,

Make along the circumferencial direction of described tire, form tipper with the left and right sides major trough portion between the tread groove of prescribed distance configuration, this tipper tilts in the mode that court and tyre rotation side expand in the opposite direction, and along 1 week of whole tire, launch described tyre surface along tire circumferential direction, when this tire circumferential direction is observed described major trough, connect described tipper to constitute described major trough, so that can see this major trough by circumferential end to another circumferential end always from of this major trough

Be provided with secondary groove at the lug surface of described left and right sides tire shoulder portion along the transversal described projection of tire width direction.

2. air-inflation tyre according to claim 1, wherein: form so that the left and right sides major trough part of each tread groove towards the mode bevelled tipper of expanding in the opposite direction with tyre rotation side.

3. air-inflation tyre according to claim 1 and 2, wherein: the groove width of described stria is 1mm-5mm.

4. air-inflation tyre according to claim 1 and 2, wherein: make the inner of described secondary groove be positioned at projection with the described central part of the projection row adjacency of described tire shoulder portion.

5. air-inflation tyre according to claim 1 and 2, wherein: the inner that makes described secondary groove is communicated with inboard major trough in the described major trough.

6. air-inflation tyre according to claim 1 and 2, wherein: along the circumferencial direction of the tire described left and right sides of the configuration tread groove that staggers.

7. air-inflation tyre according to claim 1 and 2, wherein: along the circumferencial direction of tire, dispose described left and right sides tread groove with transformable spacing.

8. air-inflation tyre according to claim 7, wherein: it is 2 times spacing type of the spacing type of being divided by described tread groove to form by described secondary groove and tread groove in described tire shoulder portion that described secondary groove is set.