Tire

Patent metadata

Field	Value
Publication number	US-2016016440-A1
Application number	US-201414768496-A
Country	US
Kind code	A1
Filing date	Feb 21, 2014
Priority date	Feb 22, 2013
Publication date	Jan 21, 2016
Grant date	—

Abstract

The carcass of this tire ( 1 ) has a carcass body and folded sections each folded around a bead core. A circumferential recessed section, which is recessed inward in the tire width direction and extends in the tire circumferential direction, is formed on the outer surface of the tire side section, and turbulence-generating protrusions are provided on the circumferential recessed section. In a cross-section of the tire, wherein the distance between the inner surface of the carcass body section and a rim-separation point where the inner surface comes into contact with a normal rim is defined as a tire reference thickness, and the distance between the inner surface of the folded section and the tire outer surface at the circumferential recessed section is defined as a tire thickness, the multiple turbulence-generating protrusions are provided in an area where the tire thickness is between 20% and 60% of the tire reference thickness.

First claim

1 . A tire comprising:
a tread section in contact with a road surface; a tire side section continuous to the tread section; a bead section continuous to the tire side section; and a carcass section extending throughout the tread section, the tire side section, and the bead section, wherein the carcass section has a carcass body section provided ranging from the tread section to a bead core in the bead section through the tire side section and a folded section folded at the bead core, the tire side section includes a circumferential recessed section recessed inward in a tire width direction and extending in a tire circumferential direction, the circumferential recessed section is provided with a plurality of turbulence-generating protrusions projecting outward in the tire width direction, and in a tire cross section along the tire width direction and a tire radius direction, when a distance between an inner surface on the inside in the tire width direction of the carcass body section and a rim-separation point in contact with a standard rim is specified as a tire reference thickness, and when a distance between an inner surface on the inside in the tire width direction of the folded section and a tire outer surface of the circumferential recessed section is specified as a tire thickness, the plurality of turbulence-generating protrusions are provided in a region where the tire thickness is 20% or more and 60% or less of the tire reference thickness.

2 . The tire according to claim 1 , wherein in the tire cross section, an end on the outside in the tire radius direction of the folded section is provided outward in the tire radius direction from a bead end located on the innermost side in the tire radius direction and is located in a range of 40% or more and 60% or less of a tire height.

3 . The tire according to claim 1 , wherein the plurality of turbulence-generating protrusions include a first turbulence-generating protrusion and a second turbulence-generating protrusion disposed at a predetermined pitch in the tire circumferential direction from the first turbulence-generating protrusion, and both ends in the tire radius direction of the first turbulence-generating protrusion and both ends in the tire radius direction of the second turbulence-generating protrusion are disposed in different positions in the tire radius direction.

4 . The tire according to claim 3 , wherein
the plurality of turbulence-generating protrusions include a third turbulence-generating protrusions disposed with an interval on the inside in the tire radius direction of the first turbulence-generating protrusion, an end on the outside in the tire radius direction of the second turbulence-generating protrusion is located on the outer side in the tire radius direction than an end on the inside in the tire radius direction of the first turbulence-generating protrusion, and an end on the inside in the tire radius direction of the second turbulence-generating protrusion is located on the inner side in the tire radius direction than an end on the outside in the tire radius direction of the third turbulence-generating protrusion.

5 . The tire according to claim 1 , wherein
at least one of the plurality of turbulence-generating protrusions includes a width direction lateral surface located outside in the tire width direction, a radial internal surface extending from an end on the inside in the tire radius direction of the width direction lateral surface to a tire outer surface of the circumferential recessed section, and a radial lateral surface extending from an end on the outside in the tire radius direction of the width direction lateral surface to the tire outer surface of the circumferential recessed section, in the tire cross section, the radial internal surface extends in parallel with the tire width direction or extends outward in the tire width direction to be inclined outside in the tire radius direction, and in the tire cross section, the radial lateral surface extends in parallel with the tire width direction or extends outward in the tire width direction to be inclined inside in the tire radius direction.

6 . The tire according to claim 1 , wherein a height h of the turbulence-generating protrusion is in a range of 7.5 mm or more and 25 mm or less.

7 . The tire according to claim 1 , wherein a width w of the turbulence-generating protrusion is in a range of 2 mm or more and 10 mm or less.

8 . The tire according to claim 1 , wherein the height h of the turbulence-generating protrusion, a predetermined pitch p in the tire circumferential direction of the turbulence-generating protrusion, and an average width w of the turbulence-generating protrusion satisfy the relationships of 1.0≦p/h≦50.0 and 1.0≦(p−w)/w≦100.0.

Assignees

• Bridgestone Corp

Inventors

• Matsumura Hiroyuki

Classifications

• B60C15/024

  Bead contour, e.g. lips, grooves, or ribs · CPC title

• B60C13/02 Primary

  Arrangement of grooves or ribs · CPC title

• B60C15/0009

  features of the carcass terminal portion · CPC title

• B60C2015/009

  Height of the carcass terminal portion defined in terms of a numerical value or ratio in proportion to section height · CPC title