US 12,291,059 B2
Heavy duty pneumatic tire
Hiroki Shinohara, Hyogo (JP)
Assigned to SUMITOMO RUBBER INDUSTRIES, LTD., Hyogo (JP)
Filed by SUMITOMO RUBBER INDUSTRIES, LTD., Hyogo (JP)
Filed on Oct. 11, 2023, as Appl. No. 18/379,006.
Claims priority of application No. 2022-170075 (JP), filed on Oct. 24, 2022.
Prior Publication US 2024/0131870 A1, Apr. 25, 2024
Prior Publication US 2024/0227453 A9, Jul. 11, 2024
Int. Cl. B60C 11/03 (2006.01)
CPC B60C 11/03 (2013.01) [B60C 11/0306 (2013.01); B60C 2011/0344 (2013.01); B60C 2011/0346 (2013.01); B60C 2011/0355 (2013.01); B60C 2011/0358 (2013.01); B60C 2011/036 (2013.01); B60C 2011/0362 (2013.01); B60C 2200/06 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A heavy duty pneumatic tire comprising:
a tread portion,
wherein the tread portion comprises a crown circumferential groove continuously extending on a tire equator side in a tire circumferential direction, a shoulder circumferential groove continuously extending in the tire circumferential direction on a side outward of the crown circumferential groove in a tire axial direction, a plurality of crown lateral grooves connecting between the crown circumferential groove and the shoulder circumferential groove, and a plurality of crown blocks formed by the crown circumferential groove, the shoulder circumferential groove, and the plurality of crown lateral grooves,
wherein the crown circumferential groove comprises crown first-side vertexes protruding toward the shoulder circumferential groove, and crown second-side vertexes protruding in a direction opposite to that of the crown first-side vertexes, alternately in the tire circumferential direction, and zigzags,
wherein the shoulder circumferential groove comprises shoulder inner-side vertexes protruding toward the crown circumferential groove, and shoulder outer-side vertexes protruding in a direction opposite to that of the shoulder inner-side vertexes, alternately in the tire circumferential direction, and zigzags,
wherein the plurality of crown lateral grooves that are directly adjacent to each other in the tire circumferential direction are disposed at two pitch intervals of a zigzag of the crown circumferential groove and connect between the crown first-side vertexes and the shoulder inner-side vertexes,
wherein the plurality of crown blocks has a plurality of crown sub-grooves each having a groove width less than a groove width of each of the plurality of crown lateral grooves,
wherein the plurality of crown sub-grooves each comprise at least two transverse grooves extending across the crown blocks, and
wherein a groove width of each of the plurality of crown lateral grooves is less than a groove width of the shoulder circumferential groove.
 
17. A heavy duty pneumatic tire comprising:
a tread portion,
wherein the tread portion comprises a crown circumferential groove continuously extending on a tire equator side in a tire circumferential direction, a shoulder circumferential groove continuously extending in the tire circumferential direction on a side outward of the crown circumferential groove in a tire axial direction, a plurality of crown lateral grooves connecting between the crown circumferential groove and the shoulder circumferential groove, and a plurality of crown blocks formed by the crown circumferential groove, the shoulder circumferential groove, and the plurality of crown lateral grooves,
wherein the crown circumferential groove comprises crown first-side vertexes protruding toward the shoulder circumferential groove, and crown second-side vertexes protruding in a direction opposite to that of the crown first-side vertexes, alternately in the tire circumferential direction, and zigzags,
wherein the shoulder circumferential groove comprises shoulder inner-side vertexes protruding toward the crown circumferential groove, and shoulder outer-side vertexes protruding in a direction opposite to that of the shoulder inner-side vertexes, alternately in the tire circumferential direction, and zigzags,
wherein the plurality of crown lateral grooves that are directly adjacent to each other in the tire circumferential direction are disposed at two pitch intervals of a zigzag of the crown circumferential groove and connect between the crown first-side vertexes and the shoulder inner-side vertexes,
wherein the plurality of crown blocks has a plurality of crown sub-grooves each having a groove width less than a groove width of each of the plurality of crown lateral grooves,
wherein the plurality of crown sub-grooves each comprise at least two transverse grooves extending across the crown blocks,
wherein each of the at least two transverse grooves comprises a plurality of zigzag vertexes and zigzags,
wherein the plurality of crown sub-grooves comprises connecting grooves for connecting the plurality of transverse grooves,
wherein, in each of the plurality of crown blocks, a ratio (Lc/Wc) of a maximum length Lc in the tire circumferential direction to a maximum length Wc in the tire axial direction is 1.8 to 2.2, and
wherein a groove width of each of the plurality of crown lateral grooves is less than a groove width of the shoulder circumferential groove.