Back to results
US 2013/0340906 A1Published application
D speed agriculture tires
OwnerBradley J. Harris, Joseph M. Lanzarottainventors
Life of this patent
Estimating the term…
Abstract
A “D speed” agricultural tire for self-propelled agricultural equipment can intermittently travel on the highway at speeds up to 40 mph. A sub-tread layer of high natural rubber content compound is placed between the tread and the polyester belts of the tire to aid in reducing internal heat generation adjacent the belts.
Claims27
A pneumatic agricultural tire, comprising:
- a circumferential tread portion including first and second rows of tread lugs extending from first and second shoulders of the tread portion toward an equatorial plane of the tire, the lugs extending at an angle of from 0° to 65° to a rotational axis of the tire, the tread portion having a ratio of contact area to total tread area of no greater than about 40%;
- a pair of bead portions;
- a pair of sidewall portions extending from the bead portions to the tread portion;
- a carcass including at least one carcass ply extending circumferentially about the tire, the carcass ply including an axially inner portion and axially outer turn-up portions that extend around the bead portions and extend upwardly towards the tread portion and terminate at turn-up ends;
- a plurality of circumferentially extending belts disposed between the carcass and the circumferential tread portion;
- and
- a low hysteresis sub-tread compound layer between the circumferential tread portion and the belts, the sub-tread compound layer having a lower hysteresis than the circumferential tread portion so that the sub-tread compound layer generates less heat internally than does the circumferential tread portion, the sub-tread compound layer having a thickness of at least 0.1 inch.
4 more elements
A pneumatic agricultural tire, comprising:
- a tread portion, including first and second rows of tread lugs extending from first and second shoulders of the tread portion toward an equatorial plane of the tire, the lugs extending at an angle of from 0° to 65° to a rotational axis of the tire, the tread portion having a ratio of contact area to total tread area of no greater than 40%, and the tread portion having an outside diameter of at least about 55 inches;
- a pair of opposing bead portions;
- a carcass including from at least one radial carcass ply, each carcass ply having an axially inner portion and two turn-up portions, one turn-up portion extending from each end of the axially inner portion and having a terminal end, the axially inner portion extending between the opposing bead portions and the turn-up portions being located axially outward of the bead portions;
- a plurality of belts, the belts being disposed between the carcass and the tread portion;
- and
- a low hysteresis sub-tread compound layer between the circumferential tread portion and the belts, the sub-tread compound layer having a lower hysteresis than does the circumferential tread portion, the sub-tread compound layer being formed of a uniform thickness calendared sheet having a thickness in a range of from 0.1 to 0.3 inch.
3 more elements
Dependencies are inferred from the claim text.