Pneumatic tire

Patent metadata

Field	Value
Publication number	US-10632798-B2
Application number	US-201715792877-A
Country	US
Kind code	B2
Filing date	Oct 25, 2017
Priority date	Oct 26, 2016
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

Abstract

Each side piece 40 of a tire 2 includes a rim protector 42. A bob profile representing a contour of the rim protector 42 includes a first circular arc extending outward from a top PT of the rim protector 42, and a second circular arc extending inward from the top PT. A center of the first circular arc is located inward of the bob profile, and a center of the second circular arc is located outward of the bob profile. The side piece 40 includes a side apex 22, and the side apex 22 intersects a normal line LT that is normal to a carcass 12 and passes through the top PT.

First claim

What is claimed is:

1. A pneumatic tire comprising a tread, a pair of side pieces, a pair of beads, and a carcass, wherein
each side piece extends from an edge of the tread substantially inward in a radial direction,
each bead is located inward of the side piece in an axial direction at a radially inner portion of the side piece,
the carcass extends along inner sides of the tread and the side pieces and on and between one of the beads and the other of the beads,
the side piece includes a main body and a rim protector projecting outward from the main body and extending in a circumferential direction,
a reference profile representing a contour of the main body is represented by a plurality of circular arcs aligned in the radial direction, the circular arcs include an outer circular arc extending substantially outward in the radial direction from a reference position corresponding to a position at which the tire has a maximum width in the axial direction, and an inner circular arc extending substantially inward in the radial direction from the reference position, and the outer circular arc and the inner circular arc are tangent to each other at the reference position,
a bob profile representing a contour of the rim protector includes two circular arcs aligned in the radial direction, a point of intersection between the circular arcs is a top of the rim protector, and, of the circular arcs, one circular arc extending substantially outward in the radial direction from the top is a first circular arc, and the other circular arc extending substantially inward in the radial direction from the top is a second circular arc,
the first circular arc is tangent to the outer circular arc at a radially outer end thereof, and a center of the first circular arc is located inward of the bob profile,
the second circular arc is tangent to the inner circular arc at a radially inner end thereof, and a center of the second circular arc is located outward of the bob profile,
a ratio of a distance in the radial direction from a bead base line of the tire to the top relative to a distance in the radial direction from the bead base line to a radially outer end of the carcass is not less than 0.29 and not greater than 0.41,
the side piece includes a side apex, and the side apex extends outward in the radial direction along the carcass at a radially outer side of the bead,
the side apex intersects a normal line that is normal to the carcass and passes through the top,
a ratio of a thickness of the side apex measured along the normal line, relative to a thickness of the side piece measured along the normal line, is not less than 0.10 and not greater than 0.29, and
in the radial direction, a position of an outer end of the side apex coincides with a position of an axially outer end of the carcass, or the outer end of the side apex is located inward of the axially outer end of the carcass.

2. The pneumatic tire according to claim 1 , wherein the outer end of the side apex is located inward of the axially outer end of the carcass in the radial direction.

3. The pneumatic tire according to claim 1 , wherein a ratio of a radius of the second circular arc relative to a radius of the first circular arc is not less than 0.056 and not greater than 0.117.

4. The pneumatic tire according to claim 2 , wherein a ratio of a radius of the second circular arc relative to a radius of the first circular arc is not less than 0.056 and not greater than 0.117.

Assignees

• Sumitomo Rubber Ind

Inventors

• Tomita Shintaro

Classifications

• B60C13/02

  Arrangement of grooves or ribs · CPC title

• B60C15/0027

  with low ply turn-up, i.e. folded around the bead core and terminating at the bead core · CPC title

• B60C15/0242 Primary

  with bead extensions located radially outside the rim flange position, e.g. rim flange protectors · CPC title

• B60C2015/0617

  comprising a cushion rubber other than the chafer or clinch rubber · CPC title

• B60C13/003 Primary

  characterised by sidewall curvature · CPC title