DE102011051829A1 - Vehicle pneumatic tire, particularly for passenger cars has two bead portions, which comprise bead cores and fillers, where carcass layer extends from former bead portion to later bead portion over entire tire cross-section - Google Patents

Abstract

The vehicle pneumatic tire has two bead portions (3), which comprise bead cores (4) and fillers (5). A carcass layer (6) extends from the former bead portion to the later bead portion over the entire tire cross-section. The end (11) of the carcass turn (7) is arranged in a radial height. The bead cores are high edge cores and the end of the carcass high layer is arranged within a radial height 15 millimeter measured from the bead core inner diameter. The high edge core has certain dimension in its radial extension and certain dimension in its axial extension.

Description

The invention relates to a pneumatic vehicle tire with two bead regions, which have bead cores and apex, and with at least one carcass ply, which extends over the entire tire cross section from the first to the second tire bead and from axially inwardly around the bead cores to axially outwardly and axially outwardly is executed as a carcass turn-up, wherein the end of the carcass loft is disposed at a radial height which lies within the radial extent of the apex and wherein the end of the carcass loft is bordered between the apex and an axially outer rubber layer.

Such a pneumatic vehicle tire, which is improved in its rolling resistance, is for example from the WO 2010/072737 A1 known.

Efforts are being made to continue to improve the rolling resistance of the vehicle tire and at the same time to achieve a good durability of the same.

The invention has for its object to provide a vehicle pneumatic tire, which has an improved rolling resistance with good durability.

The object is achieved by the bead core is a high-edge core and by the end of the carcass blast within a radial height of 15 mm to h * [mm], measured from the bead core inner diameter, wherein the edgewise core in its radial extent a measure a and in its axial extent has a dimension b, where a ≥ 3 × b and where h * (nominal width × aspect ratio - 17) × 0.75.

It is a vehicle pneumatic tire provided with the features of claim 1, which has a high-edge core in combination with a so-called low carcass turn-up. Although the end of the low carcass blast is within a region of the tire which is very stressed in its operation by bending over the rim, the tire is durable and does not prematurely fail in this stressed region despite the end of the carcass blast. The high-edge core and the low carcass turn-up also saves material for the tire, the weight of the tire is reduced and the rolling resistance is improved.

"Apex" means a component made of rubber, which is arranged radially above the bead core on this. "Nominal width" means the width of the tire in millimeters and corresponds to the first number of dimensions of the tire. "Aspect Ratio" means the ratio of section height to section width of the tire in percent and corresponds to the second number of dimensions of the tire. "Bead core inner diameter" means the radially innermost point of the bead core. "Multi-component Sidewall" means the component side wall, which is composed of several components, which consist of different rubber compounds. The axially outer rubber layer is part of the sidewall. "Axially outer rubber ply" means a rubber ply axially outward of the carcass puff.

In one embodiment, it is provided that the end of the carcass bluff is arranged at least 5 mm radially below the radially upper end of the apex. As a result, stress peaks are minimized at the radially upper end of the apex, which has a positive effect on the durability of the tire.

In a further advantageous embodiment, it is provided that the end of the carcass blast is arranged within a radial height of 15 mm to 0.8 × h * in mm. It is saved on material, which has an advantageous effect on the weight of the tire and its rolling resistance.

In a further embodiment, it is provided that the apex is composed of a rubber mixture having a hardness ≥ 85 ShA. As a result, stress peaks in the region of the end of the carcass blast are minimized, which has a positive effect on the durability of the tire.

In a further alternative embodiment, it is provided that the apex is composed of a rubber mixture which has a hardness ≥ 60 ShA and <85 ShA.

In a further embodiment, it is provided that the apex has an axial extent of 1-6 mm and / or a radial extent of 10-80 mm. The apex is a small chewing claw compared to common apexes, which can advantageously save weight of the tire and improve the rolling resistance of the tire. By using a high-edge core, the usual "thick" apex can be omitted or a "narrow" apex can be used, which assumes the function of adjusting the lateral stiffness in the radial direction.

In a further embodiment, it is provided that the axially outer rubber layer, which encloses the end of the carcass bump between them together with the apex, consists of a rubber mixture having a hardness ≥ 85 ShA has. The apex and the axially outer rubber layer have approximately equal high Shore A hardness, thereby securely embracing the end of the carcass bump, thereby minimizing potential stress peaks in this region and positively impacting the durability of the tire.

In a further advantageous embodiment, it is provided that the axially outer rubber layer, which together with the apex surrounds the end of the carcass bump between them, consists of a rubber mixture having a hardness ≥ 60 ShA and ≤ 90 ShA. These are ShoreA hardnesses from standard rim strip blends. There is an advantage in rolling resistance achieved by the adjustability of certain stiffnesses.

In a further advantageous embodiment, it is provided that the axially outer rubber layer is part of a multi-component sidewall.

In a further advantageous embodiment of the invention it is provided that the vehicle tire is a pneumatic vehicle tire for passenger cars.

Further features, advantages and details of the invention will now be explained in more detail with reference to the drawings, which illustrate schematic embodiments. The show:

1 a cross-sectional half of a pneumatic vehicle tire for passenger cars;

2 : A cross-section half of a passenger car pneumatic tire with a multi-component sidewall.

The in 1 Pneumatic tire shown is a tire for passenger car radial dimension 245 / 40R18 and has a tread 1 , Side walls 2 , Bead areas 3 with bead cores 4 and core riders 5 , furthermore a carcass ply 6 on which the two bead cores 4 from axially inward to axially outward and a carcass turn 7 having. Furthermore, the pneumatic vehicle tire has an inner layer 8th and one between the carcass ply 6 and the tread 1 arranged belt bandage 9 on. The belt bandage 9 has two belt layers in the embodiment shown 9a and 9b on, which can be made in a known manner from embedded in a rubber compound, mutually parallel reinforcements made of steel cord. Radially outside the two belt layers 9a . 9b there is a bandage layer 10 - A so-called cap-ply, which is formed by continuous and spiral winding of a cord in the circumferential direction of the tire and the at least lateral edges of the belt bandage 9 covered.

The end 11 of the carcass bluff is located at a radial height that is within the radial extent of the apex 5 lies, with the end 11 Carcass rash between the apex 5 and an axially outer rubber layer 12 is enclosed. The bead core 4 is a vertical core training 12 × 2, wherein two cords are arranged in the axial direction and each 12 cords in the radial direction and form the edgewise core. Each cord of the edged core is made of rubberized steel with a diameter of steel + rubberization = 1.2 mm. Thus, the edged core has an axial extent a of 14.4 mm and a radial extent b of 2.4 mm. The end 11 of the carcass blast is within a radial height h of 15 mm to h * in mm, measured from the bead core inner diameter 13 arranged. In the present example, for h * = (245 mm × 40% -17), x = 0.75 = 60.8 mm. In the 1 is the end 11 of the carcass blast at a radial height h of 25 mm. The apex 5 has an axial extent of about 2.5 mm and a radial extent of about 14.5 mm. Finished tolerances of about 0.5 mm may occur. The apex 5 and the axially outer rubber layer 12 consist of a rubber compound whose hardness is ≥ 85 ShA. The outer rubber suit 12 ends with one end below the core 4 To ensure a stable fit of the tire on the rim. The outer rubber suit 12 is covered axially outward by another rubber layer.

The Indian 2 shown pneumatic vehicle tire differs from that in the 1 shown pneumatic vehicle tire in that the side wall is a multi-component sidewall. The multi-component sidewall is made up of the outer rubber layer 12 and one axially outward of the outer rubber layer 12 adjacent first further rubber suit 14 and one radially above the first further rubber layer 14 arranged second additional rubber layer 15 together. The outer rubber suit 12 has a hardness of> 85 ShA. The first additional rubber suit 14 has a hardness of ≥ 60 ShA and ≤ 90 ShA. The second more rubber suit 15 has a hardness of ≥ 45 ShA and ≤ 60 ShA.

LIST OF REFERENCE NUMBERS

1

tread

2

Side wall

3

bead

4

bead

5

apex

6

carcass

7

a carcass

8th

inner layer

9

belt Association

9a

 first belt position

9b

 second belt layer

10

 belt bandage

11

 End of the carcass rash

12

 Outer rubber suit

13

 Wulstkerninnendurchmesser

14

 first additional rubber suit

15

 second additional rubber suit

a

axial extent of the bead core

b

radial extent of the bead core

H

Radial height of the end of the carcass rash

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2010/072737 A1 [0002]

Claims (10)

Pneumatic vehicle tire with two bead areas ( 3 ), which bead cores ( 4 ) and apex ( 5 ), as well as with at least one carcass ply ( 6 ), which extend over the entire tire cross-section from the first to the second bead area (FIG. 3 ) and axially inward around the bead cores ( 4 ) runs axially outward and as a carcass turn ( 7 ), the end ( 11 ) of the carcass bluff at a radial height (h) which is within the radial extent of the apex ( 5 ) and where the end ( 11 ) of the carcass rash between the apex ( 5 ) and an axially outer rubber layer ( 12 ), characterized in that the bead core ( 4 ) is a high-edge core and that the end ( 11 ) of the carcass blast within a radial height (h) of 15 mm to h * in mm, measured from the bead core inner diameter ( 13 ), wherein the edgewise core has a dimension a in its radial extent and a dimension b in its axial extent, where a ≥ 3 × b and where h * = (nominal width × aspect ratio - 17) × 0.75 , Vehicle tire according to claim 1, characterized in that the end ( 11 ) of the carcass blast at least 5 mm radially below the radially upper end of the auror ( 5 ) is arranged. Vehicle tire according to one of the preceding claims, characterized in that the end ( 11 ) of the carcass blast within a radial height (h) of 15 mm to 0.8 × h * in mm. Vehicle tire according to one of the preceding claims, characterized in that the apex ( 5 ) consists of a rubber mixture having a hardness ≥ 85 ShA. Vehicle tire according to one of the preceding claims 1 to 3, characterized in that the apex ( 5 ) consists of a rubber mixture having a hardness ≥ 60 ShA and <85 ShA Vehicle tire according to one of the preceding claims, characterized in that the apex ( 5 ) has an axial extent of 1-6 mm and / or a radial extent of 10-80 mm. Vehicle tire according to one of the preceding claims, characterized in that the axially outer rubber layer ( 12 ), which together with the apex ( 5 ) the end ( 11 ) of the carcass bluff between them, consists of a rubber compound having a hardness ≥ 85 ShA. Vehicle tire according to one of the preceding claims, characterized in that the axially outer rubber layer ( 21 ), which together with the apex ( 5 ) the end ( 11 ) of the carcass bluff between them, consists of a rubber mixture having a hardness ≥ 60 ShA and ≤ 90 ShA. Vehicle tire according to claim 7, characterized in that the axially outer rubber layer ( 12 ) belongs to a multi-component sidewall. Vehicle tire according to one of the preceding claims, characterized in that the vehicle tire is a vehicle tire for passenger cars.

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