Pneumatic tire with tread having sipes and shallow grooves
AssigneeBridgestone Corporation
InventorsYukihiro Kiwaki, Ryoichi Watabe, Kenichi Shibata, Kazuyoshi Tagawa
Life of this patent
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Abstract
A plurality of shallow grooves which are shallower than a sipe are formed on land sections formed on treads of a pneumatic tire. The shallow grooves are configured so that a total sectional area of the shallow grooves per unit area in a cross section in a tire width direction in at least one of tread end areas arranged at end sides of the tread surface in the tire width direction or land end areas arranged at portions adjacent to a drain main groove on the land sections becomes larger than a total sectional area of the shallow grooves per unit on the other areas.
Claims15
A pneumatic tire comprising a plurality of land sections divided by a plurality of main grooves in a tread surface and in which the land sections are divided by at least one sipe extending in a tire width direction so that sub-blocks are formed, wherein
- at least one of the plurality of main grooves is a drain main groove that is principally a drain groove,
- a plurality of shallow grooves which are shallower than the sipe are formed in the land sections, and
- a total sectional area of the shallow grooves per unit area in a cross section of the tire width direction, in at least one of tread end areas arranged at end sides of the tread surface in the tire width direction or land end areas adjacent to the drain main groove of the land sections, is larger than the total sectional area of the cross section of the shallow grooves per unit area in other areas of the tread surface,
- wherein an average depth of the shallow grooves in at least one of the tread end areas or the land end areas is deeper than an average depth of the shallow grooves in the other areas.
Dependencies are inferred from the claim text.