US Patent No. 9,352,619

PNEUMATIC TIRE


Patent No. 9,352,619
Issue Date May 31, 2016
Title Pneumatic Tire
Inventorship Naoya Ochi, Higashimurayama (JP)
Assignee BRIDGESTONE CORPORATION, Tokyo (JP)

Claim of US Patent No. 9,352,619

1. A pneumatic tire comprising two circumferential main grooves within a tread ground-contact width, and a group of polygonal
blocks between the two circumferential main grooves, in which the group of polygonal blocks is comprised of a plurality of
polygonal blocks arranged in at least two longitudinal rows in a tire circumferential direction and in a plurality of transverse
rows in a tire width direction, the polygonal blocks each having not less than five sides and being defined by narrow grooves,
wherein:
the polygonal blocks in the adjacent longitudinal rows are arranged so as to be staggered from each other in the tire circumferential
direction; and

the group of polygonal blocks having a widthwise center that is positioned within a fifty-percent-wide region of the tread
ground-contact width across a tire equatorial plane,

and including side block rows each comprised of a plurality of side blocks defined by the circumferential main grooves, widthwise
grooves and the narrow grooves and arranged in the tire circumferential direction, the side block rows being arranged on both
sides in the tire width direction across the group of polygonal blocks respectively,

the side blocks are formed so as to have a larger ground-contact area compared with the polygonal blocks,
the ground-contact areas of the side blocks arranged on both sides of the group of polygonal blocks have a different dimension
respectively,

the side blocks arranged in the outer side in the tire width direction within the blocks on both sides across the group of
polygonal blocks have a larger ground-contact area.