Resilient tires and wheels – Tires – resilient – Anti-skid devices
Patent
1998-06-25
2000-05-16
Maki, Steven D.
Resilient tires and wheels
Tires, resilient
Anti-skid devices
15220912, B60C 1111, B60C10702
Patent
active
060622822
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a directional pneumatic agricultural tire for use on farm tractors and similar agricultural type vehicles.
BACKGROUND ART
Tractor tires must have good vibration characteristics on and off the road while maintaining good traction or draw bar characteristics. Such tires must also provide for the removal of soil, mud, etc., during infield use.
The tractive power propelling the vehicle is primarily provided through and transmitted by large lugs that are typically oriented in a directional pattern. This directional pattern generally employs the use of what is commonly called or referred to as long bars or a combination of long bars and short bars. Typically, these patterns of lugs are designed to have two rows of shoulder lugs, one row extending from each shoulder of the tire towards the equatorial plane. The volumetric space between the lugs is commonly referred to as the soil discharge channels. These channels provide a means for compacted soil to discharge over the tire shoulder. This feature prevents the tire from packing with mud and enables the tire to maintain a self-cleaning capability. Generally, these tires having two rows of shoulder lugs are arranged such that the lugs create a V or chevron-type pattern, these patterns usually are centered about the equatorial plane. If they are not centered they are typically alternating such that the chevron is on one side of the equatorial plane and the next set of circumferentially adjacent lugs have a chevron which is on the opposite side of the equatorial plane. This alternating pattern is repeated such that there is a balancing effect of the chevrons. For the purposes of this invention, these alternating chevrons on one side or the other of the equatorial plane is a repeating fashion are considered symmetrical in that as the tire passes through its footprint, that is the portion of the tire contacting the ground surface, the soil discharge channels within the footprint typically average out such that the average volume within the channel is equal on the left side of the equatorial plane versus the right side of the equatorial plane. Such a tire demonstrating a long bar/short bar combination is exhibited in U.S. Pat. No. 4,383,567 and is commonly referred to in the commercial market place as the Goodyear DynaTorque II radial tire.
Another tire using a similar long bar/short bar combination is taught in U.S. Pat. No. 4,534,392. This tire is commonly referred to as the Goodyear DynaTorque Radial and the Kelly-Springfield PowerMac L/S Radial Tractor Tire. This particular tire used a combination of two long bars separated by a short bar and repeated by two long bars and this pattern is repeated on both sides of the tire. This tread pattern is such that is again exhibits a combination of chevrons that have a resultant pattern such that the soil discharge channels as the tire passes through the footprint tend to equalize.
The prior art tires typically had several characteristics in common. One being the employment of a large number of lugs where at least one of the lugs would always cross the centerline of the tire. These tires had several beneficial tractive performance characteristics in the they were good in most soil conditions and provided good draw bar traction. The problem that was prevalent in these types of designs is that the short bar would tend to wear out more rapidly than the long bars. The resultant effect is that an uneven wear pattern would be generated in the tire after a period of time. This meant that the farmer would perceive the tire as being irregularly worn and therefore he considered the employment of a short bar detrimental to the performance of the product.
In 1992, The Goodyear Tire & Rubber Company introduced a new tractor tire having two sets of primary and secondary lugs. The tire was commercially identified as a DT710 and is described in U.S. Pat. No. 5,046,541. As described in the patent, this tire has good traction, vibration and cleaning characteristics. These primary and secondary lugs
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King David L.
Maki Steven D.
The Goodyear Tire & Rubber Company
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