Pneumatic tire
OwnerRyoichi TOMOMATSUinventor
Life of this patent
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Abstract
This pneumatic tire includes a carcass layer, a pair of cross belts disposed on an outer side of the carcass layer in a radial direction, and a tread rubber including a cap tread and an undertread that are layered, the tread rubber being disposed on the outer side of the cross belts in the radial direction. Additionally, the loss tangent tan δ_cap of the cap tread 151 at 60° C. has the relationship tan δ_ut<tan δ_cap with respect to the loss tangent tan δ_ut of the undertread 152 at 60° C. In addition, a maximum gauge UT_ce of the undertread in center land portions has the relationship 1.20≤UT_ce/UT_sh≤2.50 with respect to a maximum gauge UT_sh of the undertread in ground contact regions of shoulder land portions.
Claims15
A pneumatic tire, comprising:
- a carcass layer;
- a pair of cross belts disposed on an outer side of the carcass layer in a radial direction;
- a tread rubber comprising a cap tread and an undertread that are layered, the tread rubber being disposed on the outer side of the cross belts in the radial direction;
- a pair of shoulder main grooves and at least one center main groove that are formed in the tread surface;
- and
- a pair of shoulder land portions and two or more center land portions that are defined by the shoulder main grooves and the center main grooves,
- a loss tangent tan δ_cap of the cap tread at 60° C. having a relationship tan δ_ut<tan δ_cap with respect to a loss tangent tan δ_ut of the undertread at 60° C., and
- a maximum gauge UT_ce of the undertread in the center land portions having a relationship 1.20≤UT_ce/UT_sh≤2.50 with respect to a maximum gauge UT_sh of the undertread in a ground contact region of the shoulder land portion.
Dependencies are inferred from the claim text.