Luftreifen

Details

Veröffentlichungs-Nr.

EP4008565

Aktenzeichen

EP21205520

Anmeldetag

29. Oktober 2021

Veröffentlichung

6. Dezember 2023

Erteilung

6. Dezember 2023

Rechtsraum

EP

IPC

B60C1/00B60C11/00B60C11/03B60C11/12

Abstract

A pneumatic tire that achieves both reduction of rolling resistance and improvement of uneven wear resistance is provided. The pneumatic tire includes: a tread portion including at least two or more rubber layers including a surface layer and an inner layer in a center region centered at a tire equator line and having a width that is 50% of a ground-contact width of a ground-contact surface; and sidewall portions. The tread portion has a circumferential groove extending in a circumferential direction, and includes a plurality of land portions demarcated by the circumferential groove and ground-contact end portions. An outer portion of each sidewall portion is overlapped on an outer side of an end portion in a tire width direction of the tread portion, and each end portion in the width direction of the inner layer is located in a part of an interface between the surface layer and the sidewall portion. A complex elastic modulus E<∗>1 (MPa) of the surface layer and a complex elastic modulus E<∗>2 (MPa) of the inner layer satisfy (E<∗>2 /E<∗>1 )<1.0, and a groove area ratio CR (%) in the center region and a groove area ratio SR (%) in a region obtained by excluding the center region from the ground-contact surface satisfy |CR-SR|≤15.

Anmelder

Firma

Sumitomo Rubber Industries, Ltd.

Land

🇯🇵 Japan

Fachgebiete