CN204955929U - Aerify car radial tire with child profile of surface is hindered to low rolling - Google Patents

Abstract

The utility model provides an inflate car radial tire, have low rolling and hinder child profile of surface, under the circumstances that does not reduce other performances of tire, improve the ground connection situation through improving the shape with control tire child profile of surface, reaching, the deformation when improving tire ground connection, realize tire rolling resistance's reduction. The tire includes the tread, and the originated child crown profile of this tread on the cross -section of tire meridian, from the tire equatorial plane and child profile of surface's the point of intersect to tire shoulder portion divides into first section hat arc and second section in proper order and be preced with the arc, the external diameter R1 of first section hat arc the external diameter R2 of second section hat arc and the child profile of surface's of department of tire shoulder portion external diameter R3 has 0.43 <= R1R2 <= 1 and 0.43 <= R2R3's <= 1 a relation, the arc length alpha of first section hat arc the arc length beta of second section hat arc and tread width TDW have 0.33 <= alpha / beta <= 3 and 0.11 <= beta TDW's <= 0.431 relation. The utility model discloses a control child crown guarantees to the smooth transition of tire shoulder portion that the distribution of tire ground connection in -process stress is even to and reduce the tire travel in horizontal and fore -and -aft deformation, the reduction tire rolls and hinders.

Description

There is the low inflation radial tyre of passenger car rolling resistance tire tread contour

Technical field

The utility model relates to air-inflation tyre technical field, be specifically related to a kind of can reduce roll resistance, have improvement tire tread contour inflation radial tyre of passenger car.

Background technology

The passenger car tire die cavity of usual design with profile give finished tire a kind of three radius crown region, from line of centers, the value of the first radius is the highest to form region, radial casing face the most flat in finished tire, second radius makes it possible to reach required loose tool profile drop at the section start of chamber shoulder radius, the value of the second radius is between the first radius and the 3rd radius, and the 3rd radius is shoulder radius and allows to have a gradual ground connection impression edge and a crown region joint be connected with tire sidewall.

Tire roll resistance and rolling resistance, be because the loss in efficiency that causes of the elasticity of tire.Wheel is when rotating, tire constantly produces deformation owing to being under pressure, this pressure is not perpendicular to ground, but points to the center of circle, so will certainly produce the resistance of a part through decomposition of force, Here it is, and why underinflation automobile drives compares excessive fuel consumption.It is not so difficult that resistance is rolled in simple reduction, but reduce some performance of always sacrificing tire while rolling resistance, in three large performances of tire: wear-resisting, roll resistance, anti-slippery, often improve wherein 1-2 bar performance, Article 3 loss of energy can be caused, so want to accomplish that three is complete, be a masty difficult problem technically.

Utility model content

The utility model provides a kind of inflation radial tyre of passenger car, have and lowly roll resistance tire tread contour, when not reducing other performances of tire, by improving and control wheel tire tread contour shape, reach improve ground connection situation, distortion when improving tire ground connection, realize the reduction of tire drag.

For solving the problems of the technologies described above, the utility model adopts following technical scheme:

A kind of have the low inflation radial tyre of passenger car rolling resistance tire tread contour, comprise tyre surface, the crown part profile of this tyre surface on the cross section of tyre equatorial, from the intersection point of the tire equatorial plane and tire tread contour to the section start of shoulder portion is divided into first paragraph successively and is preced with arc and second segment is preced with arc, the external diameter R of described first paragraph hat arc ₁, described second segment hat arc external diameter R ₂and the external diameter R of the tire tread contour at shoulder portion place ₃there is 0.43≤R ₁/ R ₂≤ 1 and 0.43≤R ₂/ R ₃the relation of≤1, the arc length α of described first paragraph hat arc, the arc length β of described second segment hat arc and tread width TDW have the relation of 0.33≤α/β≤3 and 0.11≤β/TDW≤0.431.

If when being less than described scope, tire ground connection is stressed will occur in cardiac stress large, occur abnormal wear in driving process, and in driving process, shoulder deflection increases, is unfavorable for reducing rolling resistance; If when exceeding above-mentioned scope, shoulder abrasion are abnormal, comparatively quick-wearing.

Further, described tyre surface offers at least four the circumferential major troughs extended in tire circumference, the bizet ditch depth that described circumferential major trough is positioned at crown part place is h ₁, the shoulder ditch depth that described circumferential major trough is positioned at shoulder portion place is h ₂, the deflection of described shoulder portion on the cross section of tyre equatorial is h ₃, described h ₁, h ₂and h ₃there is 1.33≤h ₁/ h ₂≤ 1.78 and 0.65≤h ₂/ h ₃the relation of≤0.75.

If it is large to be less than shoulder deflection in above-mentioned scope rear tyre driving process, during tire ground connection stress, shoulder stress is concentrated, and increases deflection and is unfavorable for that resistance is rolled in reduction; If wear away uneven after exceeding above-mentioned scope in use procedure, shoulder comparatively fast terminates to wear away the life-span, and tire arrives abrasion mark, abrasion end-of-life.

Preferably, described h ₁: h ₂: h ₃equal 13:9:14, fluctuate ± 0.5.

Preferably, described R ₁: R ₂: R ₃equal 4:6:9, fluctuate ± 0.5.

Preferably, described α: β: TDW equals 1:1:4, fluctuates ± 0.5

From above technical scheme, the utility model, by improving and control wheel tire tread contour shape, controls crown part seamlessly transitting to shoulder portion, and in guarantee tire ground connection process, stress is evenly distributed, and horizontal and vertical distortion in reduction tire running, reduce tire and roll resistance.By optimizing profile design, tire rolls resistance reduction about 6%.

Accompanying drawing explanation

Fig. 1 is the cutaway view in the tyre equatorial direction of the utility model inflation radial tyre of passenger car.

Detailed description of the invention

Below in conjunction with accompanying drawing, a kind of preferred implementation of the present utility model is described in detail.

Fig. 1 shows the cutaway view in the tyre equatorial direction of the utility model inflation radial tyre of passenger car.Reference number C L is tire equator face, and Reference numeral L is the camber line that tap drain bottom of trench is linked to be, and TDW is tread width.

Tire 10 comprises carcass 20 and is arranged at the tyre surface 30 of tire outer radial periphery of this carcass, and this tyre surface 30 comprises the most flat middle crown part 31 and is arranged at the shoulder portion 32 of these crown part both sides, and described crown part has to shoulder portion and seamlessly transits.

Described shoulder portion 32 has tyre surface end P, and in the structure with square shoulder portion, tyre surface end P refers to the point of the edge part of this shoulder portion, and because shoulder portion is square, therefore tyre surface end is consistent with tire ground terminal; And in the structure with circular shoulder portion, on the cross section in tyre equatorial direction, get the intersection point of the profile of fetus face and the profile of carcass sidewall, the intersection point causing the vertical line of shoulder portion from this intersection point is set to tyre surface end P.

Described tread width TDW refers to the distance of tyre surface 30 on the cross section of tyre equatorial, from the intersection point of tire equatorial plane CL and tire tread contour to the tyre surface end P of shoulder portion.

The crown part profile of described tyre surface 30 on the cross section of tyre equatorial, from the intersection point of tire equatorial plane CL and tire tread contour to the section start of shoulder portion can be divided into first paragraph successively and be preced with arc 31A and second segment is preced with arc 31B, the external diameter R of described first paragraph hat arc 31A ₁, described second segment hat arc 31B external diameter R ₂and the external diameter R of the tire tread contour of shoulder portion 32 ₃there is 0.43≤R ₁/ R ₂≤ 1 and 0.43≤R ₂/ R ₃the relation of≤1, preferably, described R ₁: R ₂: R ₃equal 4:6:9, fluctuate ± 0.5.

The arc length α of described first paragraph hat arc 31A, the arc length β of described second segment hat arc 31B and tread width TDW have the relation of 0.33≤α/β≤3 and 0.11≤β/TDW≤0.431.Preferably, described α: β: TDW equals 1:1:4, fluctuates ± 0.5.

Described tyre surface 30 offers at least four the circumferential major troughs 4 extended in tire circumference, the bizet ditch depth that described circumferential major trough is positioned at crown part place is h ₁, the shoulder ditch depth that described circumferential major trough is positioned at shoulder portion place is h ₂, the deflection of described shoulder portion on the cross section of tyre equatorial is h ₃, described h ₁, h ₂and h ₃there is 1.33≤h ₁/ h ₂≤ 1.78 and 0.65≤h ₂/ h ₃the relation of≤0.75.Preferably, described h ₁: h ₂: h ₃equal 13:9:14 (please numerical value be revise), fluctuate ± 0.5.

By changing crown part profile camber line, limit α, β, h ₁, h ₂, h ₃, R ₁, R ₂, R ₃functional relation, realize the design to tire protector contour shape, control h ₁with h ₂seamlessly transit, ensure being evenly distributed of stress in tire ground connection process, and reduce distortion horizontal and vertical in tire running, thus distortion when controlling tire ground connection, improve ground connection situation, realize the reduction of tire drag.

The utility model is by tire FEM Simulation, and contrast adopts the tire of former design and design after improving to roll resistance, adopt after the profile after optimization manufactures tire roll resistance experimental engine testing tire roll resistance, contrast rolls resistance difference before and after improving.

Following table, uses the tire of embodiment to roll resistance experiment more detailed description the utility model technique effect:

Adopt ECER117 rolling resistance test method:

1.1 Applicable scope

This standard is applicable to measure the new airtyred rolling resistance of C1, C2 and C3 class

1.2 test method classification

Tire axle dynamometry, measures or converts to the antagonistic force on tire axle;

Rotary drum axle calibrated wrench method, measures the input torque of rotary drum;

1.3 test condition

In order to accurately measure the friction force of tire axle under test condition (load, air pressure, temperature), the aerodynamic loss of tyre rim fabricate block, rotary drum (with the electrical motor/be equipped with or power-transfer clutch) bearing friction power, and the aerodynamic loss of rotary drum, need the method for measurement determining additive decrementation according to selected rolling resistance measuring method.When adopting dynamometry and calibrated wrench method, laboratory must perform test method and measure additive decrementation.

1.4 tire axle dynamometries

F _pl＝F _t(1+r _L/R)

In formula: F _t-wheel shaft the power (see 6.4.6.1) that represents by newton;

R _lunder-stabilized conditions, wheel shaft center is to the distance of rotary drum outside face, unit m;

R-rotary drum radius, unit m.

1.5 rotary drum axle calibrated wrench methods

F _pl＝T _t/R

In formula: T _tthe input torque of definition in-(see 6.4.6.1), unit Nm;

R-rotary drum radius, unit m.

1.6 rolling resistance calculate

1.6.1 tire axle dynamometry

Rolling resistance Fr is by following formulae discovery, and unit is N:

$F_r=F_t\&lsqb;1+\frac{r_L}{R}\&rsqb;-F_{pl}$

In formula: F _t-wheel shaft power, unit N;

F _pl-according to 6.5.1.2 bar calculate additive decrementation, unit N;

R _l--wheel shaft center is to the distance of rotary drum outside face at steady state, unit m;

R-rotary drum radius, unit m.

1.6.2 rotary drum axle calibrated wrench method

Rolling resistance Fr is by following formulae discovery, and unit is N:

$F_r=\frac{T_t}{R}-F_{pl}$

In formula: T _t-input torque, unit Nm;

F _pl-according to 6.5.1.3 bar calculate additive decrementation, unit N;

R-rotary drum radius, unit m.

1.6.3 data analysis

Coefficient of rolling resistance Cr is calculated divided by loading of tire by rolling resistance, and formula is as follows:

$C_r=\frac{F_r}{L_m}$

In formula: F _r-rolling resistance, unit N;

L _m-test load, unit kN.

Correcting through temperature adjustmemt and roller diameter, finally draw test result.

1.7 test results:

It is 8.24 that the tire of original design rolls resistance performance index, and three embodiment test results of new design are respectively 7.5,7.7,7.8, and by optimizing profile design, tire rolls resistance reduction about 6%.

The above embodiment is only be described preferred implementation of the present utility model; not scope of the present utility model is limited; under the prerequisite not departing from the utility model design spirit; the various distortion that those of ordinary skill in the art make the technical solution of the utility model and improvement, all should fall in protection domain that claims of the present utility model determine.

Claims (5)

1. one kind has the low inflation radial tyre of passenger car rolling resistance tire tread contour, comprise tyre surface, the crown part profile of this tyre surface on the cross section of tyre equatorial, from the intersection point of the tire equatorial plane and tire tread contour to the section start of shoulder portion is divided into first paragraph successively and is preced with arc and second segment is preced with arc, it is characterized in that, the external diameter R of described first paragraph hat arc ₁, described second segment hat arc external diameter R ₂and the external diameter R of the tire tread contour at shoulder portion place ₃there is 0.43≤R ₁/ R ₂≤ 1 and 0.43≤R ₂/ R ₃the relation of≤1, the arc length α of described first paragraph hat arc, the arc length β of described second segment hat arc and tread width TDW have the relation of 0.33≤α/β≤3 and 0.11≤β/TDW≤0.431.

2. inflation radial tyre of passenger car according to claim 1, is characterized in that, described tyre surface offers at least four the circumferential major troughs extended in tire circumference, and the bizet ditch depth that described circumferential major trough is positioned at crown part place is h ₁, the shoulder ditch depth that described circumferential major trough is positioned at shoulder portion place is h ₂, the deflection of described shoulder portion on the cross section of tyre equatorial is h ₃, described h ₁, h ₂and h ₃there is 1.33≤h ₁/ h ₂≤ 1.78 and 0.65≤h ₂/ h ₃the relation of≤0.75.

3. inflation radial tyre of passenger car according to claim 2, is characterized in that, described h ₁: h ₂: h ₃equal 13:9:14, fluctuate ± 0.5.

4. inflation radial tyre of passenger car according to claim 1, is characterized in that, described R ₁: R ₂: R ₃equal 4:6:9, fluctuate ± 0.5.

5. inflation radial tyre of passenger car according to claim 1, is characterized in that, described α: β: TDW equals 1:1:4, fluctuates ± 0.5.