US 11,926,181 B2
Heavy duty pneumatic tire
Naofumi Kitani, Kobe (JP)
Assigned to SUMITOMO RUBBER INDUSTRIES, LTD., Kobe (JP)
Filed by SUMITOMO RUBBER INDUSTRIES, LTD., Kobe (JP)
Filed on Nov. 9, 2022, as Appl. No. 17/983,523.
Claims priority of application No. 2021-183309 (JP), filed on Nov. 10, 2021.
Prior Publication US 2023/0141597 A1, May 11, 2023
Int. Cl. B60C 9/18 (2006.01); B60C 9/20 (2006.01); B60C 11/03 (2006.01)
CPC B60C 9/20 (2013.01) [B60C 2009/1842 (2013.01); B60C 2009/1857 (2013.01); B60C 2011/0341 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A heavy duty pneumatic tire having a nominal aspect ratio of 65% or less, the heavy duty pneumatic tire comprising:
a tread having a tread surface that comes into contact with a road surface;
a pair of sidewalls connected to an end of the tread and located radially inward of the tread;
a pair of beads being a first bead and a second bead that are located radially inward of the pair of sidewalls;
a carcass located inward of the tread and the pair of sidewalls and extending between the first bead and the second bead; and
a reinforcing layer located between the tread and the carcass,
wherein
the tread has at least three circumferential grooves,
among the at least three circumferential grooves, is a shoulder circumferential groove which is a circumferential groove located on each outer side in an axial direction,
the reinforcing layer includes a band including a spirally wound band cord, and a belt including a large number of belt cords aligned with each other,
the band includes a full band and a pair of edge bands located radially outward of an end of the full band,
the end of the full band is located axially outward of the shoulder circumferential groove,
the belt includes at least three belt plies aligned in the radial direction,
the at least three belt plies include a first belt ply, a second belt ply located radially outward of the first belt ply, and a third belt ply located radially outward of the second belt ply,
the third belt ply is located radially inward of the pair of edge bands,
a distance between each edge band and the full band or the third belt ply is not less than 2.2 mm and not greater than 4.0 mm,
a ratio of a tire thickness at an end of the tread surface to a tire thickness at an equator plane is not less than 1.2 and not greater than 2.0, and
the reinforcing layer further includes a buffer layer consisting of a crosslinked rubber which is located between the pair of edge bands and the full band or the third belt ply.