Nokian Tyres Plc

Nokian Renkaat Oyj

Mikko Jokinen

Jorma Tikka

Niko Haanketo

Slava Bukarev

Tomi Korkama

Niko Nummi

Outi Husso

Teemu Venäläinen

Aki Aro

Sirpa Syvänen

Mikko Sironen

Tyre portion

A tread block arrangement is suitable for a tire or for a tread band for a tire. The tread block arrangement includes a tread block having a first sipe delimited by a first sipe wall, a second sipe wall and a bottom of the sipe. The first sipe wall and the second sipe wall are arranged parallel to each other and define a width of the sipe. At least the first sipe wall has an indentation to increase an empty volume of the sipe at the location of the indentation. The first sipe wall has an inclined section to form the indentation, wherein a distance between the first sipe wall and the second sipe wall increases towards the bottom of the sipe at the location of the inclined section. A tire has the tread block arrangement and a lamella plate for forming sipes of the tread block arrangement.

Tread block arrangement having a sipe

A tread block arrangement is for a tire or for a tread band for a tire. The tread block arrangement includes a tread block having at least a first sipe delimited by a first sipe wall, a second sipe wall and a bottom of the sipe. The first sipe wall and the second sipe wall are arranged parallel to each other and define a width (w) of the sipe. At least the first sipe wall has at least one inclined section in which a width of a surface of the first sipe wall in a longitudinal direction of the sipe and the width of the sipe increases towards the bottom of the sipe.

Tyre

Tire

The invention relates to a tread block arrangement of a tread band or a tire. The tread block arrangement forms a tread that is meant for a rolling contact against a ground surface, wherein the tread is provided with at least one longitudinal groove. The tread block arrangement limits a first number (NT) of sipes, of which a second number (NTT) are transversal sipes of which a third number (N) of sipes form a group. For each sipe of the group, the tread block arrangement forms a bottom a first sidewall, a second sidewall, and a first end wall. The end first end wall of each sipe of the group is configured such that a distance between the first end wall of the sipe in question and an outer side of the pneumatic tire or the tread band is less than a distance between the other end of the sipe in question and the outer side. Moreover, at least a part of the first end wall of the sipe in question has a first surface normal of the sipe in question, and the first surface normal of the sipe in question forms a first angle of the sipe in question of at least 20 degrees with the tread. Furthermore, the ratio (NTT/NT) of the second number (NTT) to the first number (N) is at least 75% and the ratio (N/NTT) of the third number (N) to the second number (NTT) is at least 20%.

Tread block arrangement having a supporting sipe

Growing community of inventors

Tampere, Finland

Mikko Jokinen