Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Patent
1998-11-30
2000-10-17
Johnstone, Adrienne C.
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
1521542, 152526, B60C 918, B60C 920, B60C 1124, B60C 500, B60C 1900
Patent
active
061316334
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention pertains to the art of pneumatic tires, and more specifically to tires of the type having a breaker assembly comprising layers of cord fabric positioned beneath the tread. The breaker assembly includes wear strips to reduce wear in the crown region of the tire.
BACKGROUND ART
Pneumatic tires which are used in aircraft landing applications tend to wear along the centerline faster than the shoulder regions. When the tire wears through the breaker assembly, it must be removed and replaced.
In the art, various breaker assembly constructions have been set forth for use in pneumatic tires in efforts to enhance certain features of the tire. For example, U.S. Pat. No. 3,717,191 to Harrington et al. discloses a strip of rubber compound interposed between adjacent layers of cord fabric in a breaker assembly in order to change the stiffness of the tread between the crown and shoulder regions.
The arrangement of the bias angle of cords within a breaker ply with respect to the bias angle of cords within an additional breaker ply, as disclosed in U.S. Pat. No. 3,131,744 to Boussu et al., seeks to improve the roadability and riding comfort of a pneumatic tire.
In U.S. Pat. No. 3,762,458 to Yoshida et al., a pneumatic tire having a breaker layer of rubber coated glass cords sandwiched between two layers of short cut fiber reinforced rubber is disclosed. The pneumatic tire purportedly has improved abrasion resistance, cornering power and plunger resistance.
DISCLOSURE OF INVENTION
The present invention is directed to a pneumatic tire having an improved breaker assembly in order to resist wear in the crown region of the tire. The tire is particularly useful in aircraft applications in order to increase the number of landings the tire can achieve before replacement is necessary.
Generally, the pneumatic tire 10 includes a pair of beads (not shown), a carcass 18 extending from one bead to the other through a crown region of the tire, a tread 14 covering the outer side of the carcass 18, and a breaker assembly 20, 20A, 20B disposed between the tread 14 and the carcass 18 in the crown region of the tire. The breaker assembly 20, 20A, 20B includes wear strips. The construction of the wear strips and placement in the breaker assembly are set forth in the following preferred embodiments.
In one embodiment, the breaker assembly 20 comprises a first circumferentially extending breaker layer 24 which includes a central portion 26 located between a pair of extension 30. Preferably, the central portion 26 comprises rubber material and the extensions 30 comprise cord fabric. The central portion 26 acts as a wear strip to improve performance of the tire in aircraft landing applications.
A second circumferentially extending breaker layer 34 is positioned radially inwardly of the first layer 24. In a preferred embodiment, the second layer 34 is formed of cord fabric.
A third circumferentially extending breaker layer 40, located radially inwardly of the second layer 34, also includes a central portion 44 between a pair of extensions 48. The construction of the third layer 40 is similar to that of the first layer 24 in that the central portion 44 comprises rubber while the extension 48 comprise cord fabric.
A fourth circumferentially extending breaker layer 52 is located radially inwardly of the third layer 40. The construction of the fourth layer 52 is similar to that of the second layer 34 and comprises cord fabric.
Another embodiment of the present invention includes at least three, and preferably four, circumferentially extending breaker layers 56, 60, 64, 68 comprising cord fabric. Interposed between adjacent layers in the central region of the breaker assembly 20A are narrow, relatively thin strips 72 of rubber.
In yet another embodiment, first, second, and third circumferentially extending breaker layers 80, 84, 88 comprise cord fabric. Interposed between adjacent layers in the central region of the breaker assembly 20B are narrow wear strips 92 of cord fabric.
For ease of understanding this discl
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Emerson Roger D
Johnstone Adrienne C.
The Goodyear Tire & Rubber Company
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