Pneumatic agricultural tire

Details Pneumatic agricultural tire Pneumatic agricultural tire

1992-11-20

1994-08-16

Ball, Michael W.

Resilient tires and wheels

Tires, resilient

Anti-skid devices

152209B, B60C 1103

Patent

active

053378164

ABSTRACT:
An improved pneumatic agricultural tire (10) having a maximum section width (SW), an equatorial plane (EP) and a rim diameter (D) of 24 (61 cm) inches or greater is described. The tire (10) is particularly well suited for use as an irrigation tire. The tire (10) comprises a casing (12) having a cord reinforced rubber coated carcass (14) and a rubber tread (40) disposed radially outwardly of the carcass. The tread (40) includes an inner tread (42) and tread lugs (44,44L). The lugs (44,44L) are of a depth of less than R1, (R1 being defined as about 1.52 inches or about 3.9 cm) preferably about 80% of the R1 depth. The lugs extend axially inward a distance of 25% to 60% of the section width from an axially outer end to an axially inner end and less than a majority of the lugs extend across the equatorial plane of the tire. The tread (40) has a net-to-gross ratio of less than 30%. The tread lugs each have a centerline located midway between leading (52) and trailing edges (54) of the lug (44,44L). The circumferential spacing .chi..sub.n of the adjacent lugs (44,44L) is at a circumferential plane (CP) parallel to and located 75% of the distance SW/2 from the equatorial plane (EP) to a plane tangent to the casing (12) at the maximum section width. The distance .chi..sub.n varies by at least 10% of the section width from each circumferentially adjacent lug spacing, preferably at least 15%.

REFERENCES:
patent: 4186788 (1980-02-01), Pommier
patent: 4289183 (1981-09-01), Abe et al.
patent: 4446902 (1984-05-01), Madec et al.
patent: 4534392 (1985-08-01), Bonko et al.
patent: 5002110 (1991-03-01), Tsurunaga et al.
patent: 5010935 (1991-04-01), Bonko et al.
"1991 Tire Tread Design, " Sigma Rear Wheel Multi-Trac L/S Rear Radial (R1) p. 217.
1991 Tread Design Guide, Firestone Implement Irrigation Special (R-1), p. 210.
1991 Tread Design Guide, Kelly-Springfield Rear Wheel Irrigation Traction (R-1), p. 213.
1991 Tread Design Guide, Sigma Rear Wheel Multi-Trac L/S Rear Tractor (R-1), p. 217.

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