Pneumatic tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorsKenji Hamamura, Hiroki Kawai, Subaru Toya
Life of this patent
Estimating the term…
Abstract
A pneumatic tire having a side portion and a clinch portion, wherein: in a meridian cross section, the distance from a bead baseline to the outside portion in the width direction of the clinch portion is greater than the distance to the inside portion in the width direction; the E*S of the side portion, as measured at 70° C., a frequency of 10 Hz, an initial distortion of 5%, and a distortion rate of 1%, is less than the E*C of the clinch portion; and, formulas (1) and (2) are satisfied: 1600≤(Dt2×π/4)/Wt≤2827.4 (1) [(V+1.5×107)/Wt]≤2.88×105 (2) where Wt is the cross-sectional width of the tire installed on a standardized rim and filled with air to an internal pressure of 250 kPa, Dt is the outer diameter, and V is the volume of the tire.
Claims18
A pneumatic tire comprising:
- a side portion and a clinch portion, wherein,
- Ha>Hb, where, in a meridian cross section, a distance from a bead base line to a width direction outside portion of the clinch portion at a joint surface between the side portion and the clinch portion is Ha (mm), and a distance from the bead base line to a width direction inside portion of the clinch portion at the joint surface between a radially innermost portion of the side portion and the clinch portion is Hb (mm);
- E*S<E*C, where, measured under conditions of 70° C., a frequency of 10 Hz, an initial strain of 5%, and a dynamic strain rate of 1%, a complex elastic modulus of the side portion is E*S (MPa), and a complex elastic modulus of the clinch portion is E*C (MPa);
- and
- the tire satisfies following (formula 1) and (formula 2):
- 1600≤(Dt2×π/4)/Wt≤2827.4 (formula 1)
- [(V+1.5×107)/Wt]≤2.88×105 (formula 2),
- where a cross-sectional width of the tire is Wt (mm), an outer diameter is Dt (mm), and a volume of space occupied by the tire is a virtual volume V (mm3), when the tire is installed on a standardized rim and an internal pressure is 250 kPa,
- Ha−Hb is 35 mm or more,
- (E*C−E*S)/Wt is 0.015 or more,
- a plurality of lateral grooves extending in a tire axial direction are formed in a tread portion of the tire, and a total volume of the plurality of lateral grooves is 2.0 to 5.0% of a volume of the tread portion,
- the pneumatic tire has an aspect ratio of 41% or less, and
- the cross-sectional width Wt (mm) is 228 mm or more.
A pneumatic tire comprising:
- a side portion and a clinch portion, wherein,
- Ha>Hb, where, in a meridian cross section, a distance from a bead base line to a width direction outside portion of the clinch portion at a joint surface between the side portion and the clinch portion is Ha (mm), and a distance from the bead base line to a width direction inside portion of the clinch portion at the joint surface between a radially innermost portion of the side portion and the clinch portion is Hb (mm);
- E*S<E*C, where, measured under conditions of 70° C., a frequency of 10 Hz, an initial strain of 5%, and a dynamic strain rate of 1%, a complex elastic modulus of the side portion is E*S (MPa), and a complex elastic modulus of the clinch portion is E*C (MPa);
- and
- the tire satisfies following (formula 1) and (formula 2):
- 1600≤(Dt2×π/4)/Wt≤2827.4 (formula 1)
- [(V+1.5×107)/Wt]≤2.88×105 (formula 2),
- where a cross-sectional width of the tire is Wt (mm), an outer diameter is Dt (mm), and a volume of space occupied by the tire is a virtual volume V (mm3), when the tire is installed on a standardized rim and an internal pressure is 250 kPa,
- Ha−Hb is 35 mm or more,
- a plurality of lateral grooves extending in a tire axial direction are formed in a tread portion of the tire, and a total volume of the plurality of lateral grooves is 2.0 to 5.0% of a volume of the tread portion,
- the pneumatic tire has an aspect ratio of 41% or less, and
- the cross-sectional width Wt (mm) is 228 mm or more.
Dependencies are inferred from the claim text.