Agricultural vehicle tire

• US 7,762,296 B2
• Filed: 11/20/2007
• Issued: 07/27/2010
• Est. Priority Date: 11/24/2006
• Status: Active Grant

• Current Assignee: Yokohama Off-Highway Tires America Incorporated (Yokohama Rubber Company Limited)
• Original Assignee: Alliance Tire Americas, Inc. (Yokohama Rubber Company Limited)
• Inventors: Courtemanche, Alain, Mazzola, Domenic E., Ganz, David, Coetzee, Steven, Blomerus, Tian
• Primary Examiner(s): Maki; Steven D
• Application Number:
  US11/943,331
• Publication Number:
  US 20080289737A1
• Time in Patent Office: 980 Days
• Field of Search: 152/209.1, 152/209.12, 152/209.18, 152/209.28, 152/902, 152/903, D12/544, D12/579
• US Class Current: 152/209.1
• CPC Class Codes: B60C 11/0311 Patterns comprising tread lugs arranged parallel or oblique to the axis of rotation
• CPC Class Codes: B60C 11/0316 further characterised by the groove cross-section
• CPC Class Codes: B60C 11/033 by the void or net-to-gross ratios of the patterns
• CPC Class Codes: Y10S 152/902 Non-directional tread pattern having no circumferential rib and having blocks defined by circumferential grooves and transverse grooves
• CPC Class Codes: Y10S 152/903 Non-directional tread pattern having non-circumferential transverse groove following smooth curved path

Abstract

This invention provides a tire for agricultural vehicles that employs a tread design having a flattened contact surface across the width and a plurality of curved lugs that alternately extend from each sidewall to a location nearly adjacent to the opposing side wall. Each lug curves so that a central section at the center of the tire width is located on the surface ahead on the circumference of adjoining sections of the lug that extend toward each of the opposing sidewalls. In this manner, each lug appears to have a curved “banana” shape that extends across the width of the tire contact surface in a generally axial alignment. The grooves between lugs extend generally axially across the width, as a result. They are narrowed, having a circumferential width that is between approximately 20% and 30% of the average circumferential width of a lug. This geometry places more lug surface in contact with the road for better handling and longer tread life and provides less groove space to retain mud and detritus. This geometry also causes more accumulated mud and detritus to be squeezed from, and ejected out of, the tire prior to the transition onto hard road from soft ground, thereby reducing undesirable tracking on the road surface.

Claims

1. An industrial tire for field and road use comprising:

a contact surface having a plurality of interleaved continuous lugs with grooves therebetween, the lugs being continuously curved and the grooves being free of breaks and obstructions therealong;

the lugs each extending axially from a first sidewall to a respective location inset from a second sidewall and adjacent lugs extending from the second sidewall to a respective location inset from the first sidewall; and

wherein a solid-to-void ratio of the contact surface is in a range of approximately 1.25;

1 to 2.25;

1, each of the lugs extends between approximately 85 and 92 percent of an overall axial width of the contact surface, and each of the grooves defines a circumferential width that is between approximately 20% and 30% of an average circumferential width of each of the lugs.

2. The industrial tire of claim 1 wherein each of the lugs defines a wall that extends at an angle of between approximately 20 and 25 degrees with respect to a radial line of the tire.

3. The industrial tire as set forth in claim 1 wherein an inner bead of the tire is constructed and arranged to mount to a rim of a tractor-towed agricultural trailer.

4. In combination, an agricultural trailer and at least one industrial tire mounted on a rim of the agricultural vehicle, the tire further comprising:

an inner bead mounted to the rim of the agricultural trailer;

a contact surface having a plurality of interleaved continuous lugs with grooves therebetween, the lugs being continuously curved and the grooves being free of breaks and obstructions therealong;

the lugs each extending axially from a first sidewall to a respective location inset from a second sidewall and adjacent lugs extending from the second sidewall to a respective location inset from the first sidewall; and

wherein each of the lugs extends between approximately 85 and 92 percent of an overall axial width of the contact surface, a solid-to-void ratio of the contact surface is in a range of approximately 1.25;

1 to 2.25;

1, and

each of the grooves defines a circumferential width that is between approximately 20% and 30% of an average circumferential width of each of the lugs.

5. The agricultural trailer and the industrial tire as set forth in claim 4 wherein the agricultural trailer comprises a tractor-towed liquid manure spreader.

6. The agricultural trailer and industrial tire as set forth in claim 4 wherein each of the lugs is oriented with ends thereof directed downwardly on a rear-facing side of the tire opposite a front facing end in a direction toward a trailer hitch of the trailer at a front end of the trailer so that debris is channeled from the ends during forward movement of the trailer.

7. The agricultural trailer and the industrial tire as set forth in claim 4 wherein each of the lugs defines a wall that extends at an angle of between approximately 20 and 25 degrees with respect to a radial line of the tire.