Back to results
US 2023/0311588 A1Published application
Heavy duty pneumatic tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorSatoko TSUJIBAYASHI
Life of this patent
Estimating the term…
Abstract
A heavy duty pneumatic tire can have, in each shoulder land portion, a plurality of holes extending from an outer surface thereof toward a belt. The tire can include a fiber reinforcing layer including a relatively large number of fiber cords aligned with each other and formed from a nylon fiber. The fiber reinforcing layer can include an inner fiber reinforcing layer and an outer fiber reinforcing layer. The inner fiber reinforcing layer can cover an outer end of a steel reinforcing layer from an outer side in an axial direction, and the outer fiber reinforcing layer can cover an outer end of the inner fiber reinforcing layer from the outer side in the axial direction.
Claims20
A heavy duty pneumatic tire comprising:
- a pair of beads each having a core extending in a circumferential direction;
- a carcass including a carcass ply having a body portion extending between one core and the other core and a pair of turned-up portions connected to the body portion and turned up around the cores from an inner side toward an outer side in an axial direction, the carcass ply including a plurality of carcass cords aligned with each other;
- a tread radially outward of the body portion;
- a belt radially outward of the body portion and radially inward of the tread;
- a steel reinforcing layer turned up around the core, having an inner end inward of the body portion in the axial direction and an outer end outward of the turned-up portion in the axial direction, and including a plurality of steel cords aligned with each other;
- and
- a fiber reinforcing layer including a plurality of fiber cords aligned with each other, wherein
- at least three circumferential grooves are formed on the tread so as to be aligned in the axial direction, whereby at least four land portions are formed therein so as to be aligned in the axial direction,
- among the at least three circumferential grooves, a circumferential groove located on each outermost side in the axial direction is a shoulder circumferential groove,
- among the four land portions, a land portion located on each outermost side in the axial direction is a shoulder land portion,
- a plurality of holes are in the shoulder land portion and extend from an outer surface thereof toward the belt,
- each of the plurality of fiber cords is formed from a nylon fiber,
- the fiber reinforcing layer includes an inner fiber reinforcing layer on an innermost side in the axial direction and an outer fiber reinforcing layer on the outermost side in the axial direction,
- the inner fiber reinforcing layer covers an outer end of the steel reinforcing layer from the outer side in the axial direction, and
- the outer fiber reinforcing layer covers an outer end of the inner fiber reinforcing layer from the outer side in the axial direction.
12 more elements
A heavy duty tire comprising:
- a pair of beads each having a core extending in a circumferential direction;
- a carcass including a carcass ply having a body portion extending between one core and the other core and a pair of turned-up portions connected to the body portion and turned up around the cores from an inner side toward an outer side in an axial direction, the carcass ply including a plurality of carcass cords;
- a tread radially outward of the body portion;
- a belt radially outward of the body portion and radially inward of the tread;
- a steel reinforcing layer turned up around the core, having an inner end inward of the body portion in the axial direction and an outer end outward of the turned-up portion in the axial direction, and including a plurality of steel cords;
- and
- a fiber reinforcing layer including a plurality of fiber cords, wherein
- at least three circumferential grooves are formed on the tread so as to be aligned in the axial direction, whereby at least four land portions are formed therein so as to be aligned in the axial direction,
- among the at least three circumferential grooves, a circumferential groove located on each outermost side in the axial direction is a shoulder circumferential groove,
- among the four land portions, a land portion located on each outermost side in the axial direction is a shoulder land portion,
- a plurality of holes are in the shoulder land portion and extend from an outer surface thereof toward the belt,
- the fiber reinforcing layer includes an inner fiber reinforcing layer on an innermost side in the axial direction and an outer fiber reinforcing layer on the outermost side in the axial direction,
- the inner fiber reinforcing layer covers an outer end of the steel reinforcing layer from the outer side in the axial direction, and
- the outer fiber reinforcing layer covers an outer end of the inner fiber reinforcing layer from the outer side in the axial direction.
11 more elements
Dependencies are inferred from the claim text.