Pneumatic vehicle tire having a tread

Patent metadata

Field	Value
Publication number	US-10703141-B2
Application number	US-201715792334-A
Country	US
Kind code	B2
Filing date	Oct 24, 2017
Priority date	Apr 29, 2015
Publication date	Jul 7, 2020
Grant date	Jul 7, 2020

Abstract

Disclosed are pneumatic vehicle tires and methods of their production, the tires comprising a tread that has a tread segment arranged radially on the outside, and a material strip that is arranged helically in windings approximately in the circumferential direction, wherein, in the region of the tread segment, the material strip has at least two layers in the longitudinal direction of the material strip, wherein the first layer is formed from a first rubber compound and the second layer is formed from a second rubber compound, and wherein the layers connect the radially outer surface to the radially inner surface of the tread segment. The disclosed pneumatic vehicle tire has lower noise emissions and more uniform wear during driving and is improved in respect of at least one conflict of aims.

First claim

What is claimed is:

1. A pneumatic vehicle tire comprising a tread,
wherein the tread comprises a tread segment that is arranged radially on the outside,
wherein the tread segment comprises a material strip that is arranged helically in windings approximately in the circumferential direction,
wherein, in the region of the tread segment, the material strip comprises at least a first layer and a second layer in the longitudinal direction of the material strip,
wherein the first layer of the material strip is formed from a first rubber compound and the second layer of the material strip is formed from a second rubber compound that is different from the first rubber compound,
wherein the first layer of the material strip and the second layer of the material strip connect the radially outer surface of the tread segment to the radially inner surface of the tread segment,
wherein in the vulcanized state, the first rubber compound and the second rubber compound comprise approximately the same Shore A hardness, determined at room temperature in accordance with DIN ISO 7619-1,
wherein in the vulcanized state, the first rubber compound and the second rubber compound differ in at least one additional physical property, and
wherein the first rubber compound and the second rubber compound differ by at least 2% in the rebound resilience thereof, and wherein the rubber compound with the greater rebound resilience has a rebound resilience of 23% to 75% and the other rubber compound has a rebound resilience of 8% to 50%, in each case determined at room temperature in accordance with DIN 53512.

2. The pneumatic vehicle tire of claim 1 , wherein the first rubber compound and the second rubber compound differ by at least 5% in the rebound resilience thereof, and wherein the rubber compound with the greater rebound resilience has a rebound resilience of 23% to 75% and the other rubber compound has a rebound resilience of 8% to 50%, in each case determined at room temperature in accordance with DIN 53512.

3. The pneumatic vehicle tire of claim 1 , wherein the second rubber compound comprises a stress value, determined at 300% elongation at room temperature in accordance with DIN 53504, that is higher by at least 1.0 MPa than that of the first rubber compound.

4. The pneumatic vehicle tire of claim 1 , wherein the second rubber compound comprises a stress value, determined at 300% elongation at room temperature in accordance with DIN 53504, that is higher by at least 1.5 MPa than that of the first rubber compound.

5. The pneumatic vehicle tire of claim 1 , wherein the two rubber compounds each comprise a Shore A hardness of 48 Shore A to 75 Shore A.

6. The pneumatic vehicle tire of claim 1 , wherein the two rubber compounds each comprise a Shore A hardness of 55 Shore A to 68 Shore A.

7. The pneumatic vehicle tire of claim 1 , wherein within the tread segment the interface between the first layer of the material strip and the second layer of the material strip comprise a mean slope angle per winding of 80° to 80° to the radial direction rR of the pneumatic vehicle tire,
wherein the ratio of the volume of the first layer of the material strip to the volume of the second layer of the material strip per winding is 1:1 to 10:1,
wherein a mean cross-sectional thickness per winding of the first layer of the material strip is 0.5 mm to 5 mm, and/or
wherein a mean cross-sectional thickness per winding of the second layer of the material strip is 0.5 mm to 5 mm.

8. The pneumatic vehicle tire of claim 1 , wherein within the tread segment the interface between the first layer of the material strip and the second layer of the material strip comprises a mean slope angle per winding of −80° to 80° to the radial direction rR of the pneumatic vehicle tire,
wherein the ratio of the volume of the first layer of the material strip to the volume of the second layer of the material strip per winding is 1:1 to 10:1,
wherein a mean cross-sectional thickness per winding of the first layer of the material strip is 0.5 mm to 1 mm, and/or
wherein a mean cross-sectional thickness per winding of the second layer of the material strip is 0.5 mm to 1 mm.

9. The pneumatic vehicle tire of claim 1 , wherein the pneumatic vehicle tire comprises two shoulder regions, wherein in one or in both shoulder regions, the tread comprises a tread segment and, axially to the inside relative to the tread segment, a further segment, arranged radially on the outside of the tread, and
wherein the volume density of the second rubber compound in the further segment is lower than the volume density of the second rubber compound in the tread segment.

10. The pneumatic vehicle tire of claim 9 , wherein the volume density of the second rubber compound in the further segment is equal to 0.

11. The pneumatic vehicle tire of claim 1 , wherein within the tread segment, the mean slope angle per winding that is enclosed by the interface between the first layer and the second layer of the material strip, and the radial direction rR, changes in the axial direction aR.

12. The pneumatic vehicle tire of claim 11 , wherein the mean slope angle per winding increases in magnitude from axially on the inside to axially on the outside.

13. The pneumatic vehicle tire of claim 1 , wherein the tread comprises two shoulder regions, each comprising one of the tread segments,
wherein the tread segments comprise a mean slope angle per winding, and
wherein the two tread segments differ in the sign of the mean slope angle thereof per winding that is enclosed by an interface between the first layer and the second layer of the respective material strip and the radial direction rR.

14. The pneumatic vehicle tire of claim 1 , wherein the material strip comprises a third layer composed of a rubber compound different from the first rubber compound and the second rubber compound.

15. The pneumatic vehicle tire of claim 1 , wherein the material strip extends over at least 80% of the axial width of the tread.

16. The pneumatic vehicle tire of claim 1 , wherein the tire is a vehicle tire or a motorcycle tire, and wherein the tire is a winter tire.

17. A method for producing a pneumatic vehicle tire, which comprises:
extruding by co-extrusion or cutting a calendered multi-compound web of at least two rubber compounds to produce a material strip;
winding the material strip approximately helically in the circumferential direction of the pneumatic vehicle tire to form a tread segment arranged radially on the outside of the vehicle tire,
wherein, in the region of the tread segment, the material strip comprises at least a first layer and a second layer in the longitudinal direction of the material strip,
wherein the first layer of the material strip is formed from a first rubber compound and the second layer of the material strip is formed from a second rubber compound that is different from the first rubber compound,
wherein the first layer of the material strip and the second layer of the material strip connect the radially outer surface of the tread segment to the radially inner surface of the tread segment,
wherein in the vulcanized state, the first rubber compound and the second rubber compound comprise approximately the same Shore A hardness, determined at room temperature in accordance with DIN ISO 7619-1,
wherein in the vulcanized state, the first rubber compound and the second rubber compound differ in at least one additional physical property,
wherein the first rubber compound and the second rubber compound differ by at least 2% in the rebound resilience thereof

Assignees

• Continental Reifen Deutschland Gmbh

Inventors

• Jabri Mohamed Aymen
• Pavon Sierra Viktoria
• Kastens Sven

Classifications

• B60C2011/0025

  Modulus or tan delta · CPC title

• B60C2011/0091

  built-up by narrow strip winding · CPC title

• B29D30/60

  by winding narrow strips · CPC title

• B29K2009/06

  SB polymers, i.e. butadiene-styrene polymers · CPC title

• B29K2995/007

  Hardness · CPC title