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EP-4520547-B1 - VEHICLE TYRE

EP4520547B1EP 4520547 B1EP4520547 B1EP 4520547B1EP-4520547-B1

Inventors

  • Römer, Justus

Dates

Publication Date
20260513
Application Date
20240823

Claims (7)

  1. Vehicle tyre with a tread (1), with a ground contact surface with a footprint width (B) and two footprint edges (k), wherein the tread (1) or a radially outer tread layer (1c) that conjointly forms the outer surface (1a) of the tread (1) is formed in the axial direction from a tread main part (1 1 ) and a shoulder-proximal tread part (1 2 ), or from the tread main part (1 1 ) and in each case one shoulder-proximal tread part (1 2 ) in each tread shoulder, wherein the or each shoulder-proximal tread part (1 2 ) a) terminates at the outer surface (1a) on the respective footprint edge (k) and, proceeding therefrom, extends in the direction towards the respective lateral tread periphery, b) protrudes beyond the respective footprint edge (k) - determined on the outer surface (1a) of the tread (1) - in the direction of the tyre equatorial plane (line A-A) by up to 4.0 mm in the axial direction, or c) has in the axial direction a spacing from the respective footprint edge (k) - determined on the outer surface (1a) of the tread (1) - in the direction of the tyre equatorial plane (line A-A), wherein the tread main part (1 1 ) and the, or each, shoulder-proximal tread part (1 2 ) consist of rubber material (G 1 , G 2 ), each having a loss factor tan δ at 70°C, determined according to DIN 53 513, wherein the loss factor tan δ at 70° of the rubber material (G 1 ) of the tread main part (1 1 ) deviates from the loss factor tan δ at 70° of the rubber material (G 2 ) of the, or of each, shoulder-proximal tread part (1 2 ), characterized in that the loss factor tan δ at 70°C of the rubber material (G 2 ) of the, or of each, shoulder-proximal tread part (1 2 ) is less than the loss factor tan δ at 70°C of the rubber material (G 1 ) of the tread main part (1 2 ).
  2. Vehicle tyre according to Claim 1, characterized in that the loss factor tan δ at 70°C of the rubber material (G 2 ) of the, or of each, shoulder-proximal tread part (1 2 ) is 10% to 90%, in particular 30% to 60%, preferably 40% to 50%, of the loss factor tan δ at 70°C of the rubber material (G 1 ) of the tread main part (1 1 ).
  3. Vehicle tyre according to Claim 1 or 2, characterized in that the loss factor tan δ at 70°C of the rubber material (G 1 ) of the tread main part (1 1 ) is 0.05 to 0.16.
  4. Vehicle tyre according to one of Claims 1 to 3, characterized in that the radially outer tread layer (1 1 ) contains the complete profiling of the tread (1).
  5. Vehicle tyre according to one of Claims 1 to 4, characterized in that , in variant b), the or each shoulder-proximal tread part (1 2 ) protrudes beyond the respective footprint edge (k) - determined on the outer surface (1a) of the tread (1) - in the direction of the tyre equatorial plane (line A-A) by at least 2.0 mm in the axial direction.
  6. Vehicle tyre according to one of Claims 1 to 5, characterized in that the tread (1) extends as far as the side walls (7).
  7. Vehicle tyre according to one of Claims 1 to 5, characterized in that said vehicle tyre has two side wall regions (4) which have in each case one side wall (7) wing rubber (8) which is formed in the shoulder region of the vehicle tyre axially laterally of the tread (1) and extends as far as the side wall (7), wherein the wing rubber (8) covers a tapered end portion of the side wall (7).

Description

The invention relates to a vehicle tire with a tread having a ground contact area with a footprint width and two footprint edges, wherein the tread or a radially outer tread layer forming the outer surface of the tread is formed in the axial direction from a tread main part and a shoulder-side tread part or from the tread main part and one shoulder-side tread part in each tread shoulder, wherein the shoulder-side tread part or each shoulder-side tread part a) ends at the outer surface at the respective footprint edge and extends from this towards the respective lateral tread edge, b) the respective footprint edge - determined on the outer surface of the tread - extends up to 4.0 mm in the axial direction towards the tire equatorial plane or c) to the respective footprint edge - determined on the outer surface of the tread - in the direction of the tire equatorial plane, has a distance in the axial direction, wherein the main tread section and each shoulder-side tread section are made of rubber material with a loss factor tan δ at 70°C, determined according to DIN 53 513, wherein the loss factor tan δ at 70° of the rubber material of the main tread section differs from the loss factor tan δ at 70° of the rubber material of each shoulder-side tread section. One such vehicle tire is made, for example, from the DE 10 2016 218 940 A1 This vehicle tire is known. It has a tread with a central tread section (main tread section) and two shoulder-side tread sections. The rubber material of the central tread section has a loss factor tan δ at 70°C, determined according to DIN 53 512, which is smaller than the loss factor tan δ at 70°C of the rubber material of the shoulder-side tread sections. Tread components. The vehicle tire should have good braking and handling characteristics as well as low rolling resistance. The US 2016/016435 A1 Disclosing a vehicle pneumatic tire with a tread comprising a radially outer tread layer forming part of the tread's outer surface and a radially inner tread layer. The radially outer tread layer is formed in the axial direction by a main tread section passing through the tire's equatorial plane and two shoulder-side tread sections, these tread sections together forming part of the tread's outer surface. The main tread section has radial extensions extending within and contacting the shoulder-side tread sections, with a thickness of 1.0 mm to 2.0 mm, and an axial width, measured without these extensions, of 30% to 70% of the footprint width. The rebound elasticity at 70°C, determined according to DIN 53512, of the rubber material of the shoulder-side tread sections is preferably greater than that of the rubber material of the main tread section, so that consequently the loss factor tan δ at 70°C of the rubber material of the shoulder-side tread sections is preferably smaller than that of the rubber material of the main tread section. Furthermore, the dynamic modulus of elasticity E' at 55°, determined according to DIN 53513, of the rubber material of the shoulder-side tread sections is lower than that of the rubber material of the main tread section. Such a tire should be optimized with regard to the conflicting objectives between rolling resistance and handling characteristics, particularly cornering resistance. From the DE 11 2013 001 701 B4 A vehicle pneumatic tire is known with a tread comprising a radially inner tread layer and a radially outer tread layer, a main tread section passing the tire's equatorial plane with an axial width of 20% to 70%, in particular 30% to 60%, of the ground contact area width, and two shoulder-side tread sections. The shoulder-side tread sections are each provided with a narrow circumferential groove. The rubber material of the main tread section has a loss factor tan δ at 0° (standard not mentioned). The rubber material of the shoulder-side tread sections has a loss factor tan δ at 60°C of 0.15 or less, and the rubber material of the main tread section has a loss factor tan δ at 60°C of 0.1 to 0.35, with the loss factor tan δ at 60°C of the rubber material of the shoulder-side tread sections being smaller than that of the rubber material of the main tread section. Since the loss factor tan δ at 0°C is known to be an indicator of wet grip (the higher the value, the better the wet grip) and the loss factor tan δ at 60°C is known to be an indicator of rolling resistance (the smaller the value, the lower the rolling resistance), the main tread section is optimized for wet grip and the shoulder-side tread sections are optimized for rolling resistance. The EP 0 662 396 A1 Disclosing a vehicle tire with a tread consisting of a main tread section with an axial width of 82% to 96% of the footprint width, two shoulder tread sections, and a radially inner tread section located within the main tread section. The rubber material of the shoulder tread sections exhibits a higher tear resistance, determined according to ASTM D 624 Form B, than the rubber material