Tread with spaced projections in stone ejecting groove
AssigneeBridgestone Tire Company Limited
InventorsHiroyoshi Takigawa, Nobuhiro Miyamura
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Abstract
A heavy duty pneumatic tire having a tread provided on its outer surface with a plurality of circumferential grooves is disclosed. At least one of the circumferential grooves is opened on the tread surface at an open groove width corresponding to 2-8% of tread transverse width, has a groove bottom width substantially equal to the open groove width, and is provided on its groove bottom with plural protrusions separated from the opposed groove walls and at an interval between the adjoining protrusions in the circumferential direction of the groove.
Claims11
In a heavy duty pneumatic tire having a tread provided on its outer surface with a plurality of circumferential grooves, the improvement wherein at least one groove of said circumferential grooves is opened on said tread surface at an open groove width corresponding to 2-8% of a transverse width of said tread, has a groove bottom width substantially equal to said open groove width in such a medium narrowed shape that the groove width is gradually decreased from the edge of said open groove to a certain narrowed point in the depthwise direction of the groove and then gradually increased from said narrowed point to the groove bottom under no load, and is provided on its groove bottom with multiple protrusions separated apart from the opposed groove walls of said groove and at an interval between the adjoining protrusions in the circumferential direction of said groove.
Dependencies are inferred from the claim text.