Heavy duty pneumatic tire

Patent metadata

Field	Value
Publication number	US-9975385-B2
Application number	US-201214354050-A
Country	US
Kind code	B2
Filing date	Oct 19, 2012
Priority date	Dec 20, 2011
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

Tire including: a tread; a pair of sidewalls extending substantially inward radially from ends of the tread; a pair of beads positioned substantially radially inwardly of the sidewalls; and a clinch portion extending from the sidewalls to the beads. A concave curved surface extends on an outer surface of the clinch portion in a circumferential direction. A convex curved surface formed on a radially outer side end of a rim flange is engageable with the concave curved surface. A ratio R 1 /R of curvature radius R 1 of the concave curved surface to a curvature radius R of the convex curved surface of the rim flange satisfies 1.7≤R 1 /R≤2.5. The curvature radii R 1 and R of the concave and convex curved surfaces, respectively, are each a radius of curvature of an arc on a cross-section taken along a plane including a tire center axis.

First claim

The invention claimed is:

1. An assembly including a heavy duty pneumatic tire and a tire rim flange, comprising:
a tread having an outer surface that forms a tread surface;
a pair of sidewalls that extends inward, in a radial direction, from ends, respectively, of the tread;
a pair of beads positioned inward of the sidewalls, respectively, in the radial direction; and
a clinch portion that extends from the sidewalls to the beads, wherein
a convex curved surface is formed on an outer side end of the rim flange and a concave curved surface extends on an outer surface of the clinch portion in a circumferential direction, said concave curved surface being the whole concave portion of the outer surface of the clinch portion and being composed of a single circular arc, on a cross section as taken along a plane including a center axis of the tire, wherein the convex curved surface of the rim flange engages with the concave curved surface of the clinch portion,
a ratio R 1 /R of a radius of curvature R 1 of the concave curved surface to a radius of curvature R of the convex curved surface of the rim flange, satisfies
1.7≤ R 1/ R≤ 2.5,

wherein the radius of curvature R 1 of the concave curved surface and the radius of curvature R of the convex curved surface are each a radius of curvature of an arc on a cross section as taken along a plane including a center axis of the tire, and
a ratio L 1 /R of a length L 1 of the arc on the cross section of the concave curved surface relative to the radius of curvature R of the convex curved surface, satisfies
0.7≤ L 1/ R≤ 1.5.

2. The assembly according to claim 1 , further comprising a carcass ply that is extended, along the tread and the sidewalls, on and between both the beads, wherein
each bead includes a core and a bead apex positioned outward of the core in the radial direction,
the carcass ply includes a main body portion and turned-up portions which are formed by the carcass ply being turned up from an inner side toward an outer side around the core, and
when N 1 represents a distance, in the radial direction, to an end of each turned-up portion of the carcass ply from a bead base line that passes through a lower end of the core and is parallel to the center axis of the tire, a ratio N 1 /R of the distance N 1 in the radial direction to the radius of curvature R of the convex curved surface, satisfies
2.1≤ N 1/ R≤ 3.5.

3. The assembly according to claim 1 , wherein a ratio L 1 /R of a length L 1 of the arc on the cross section of the concave curved surface relative to the radius of curvature R of the convex curved surface, satisfies
1.0≤ L 1/ R≤ 1.1.

4. The assembly according to claim 1 , wherein the concave curved surface of the clinch portion and the convex curved surface on the rim flange are configured to make continuous contact with each other.

Assignees

• Sumitomo Rubber Ind

Inventors

• Sugiyama Naoki
• OHKOSHI Makoto
• Takahashi Hiroki

Classifications

• B60C2200/06

  for heavy duty vehicles · CPC title

• B60C2015/0625

  provided at the terminal edge portion of a carcass or reinforcing layer · CPC title

• B60C15/0607

  comprising several parts, e.g. made of different rubbers · CPC title

• B60C15/024

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

• B60C15/0635 Primary

  using chippers between the carcass layer and chafer rubber wrapped around the bead · CPC title