Pneumatic tire having outer tread layer of foam rubber

Details Pneumatic tire having outer tread layer of foam rubber Pneumatic tire having outer tread layer of foam rubber

1991-04-26

1993-01-05

Knable, Geoffrey

Resilient tires and wheels

Tires, resilient

Anti-skid devices

152DIG3, 152DIG4, B60C 1100

Patent

active

051767651

ABSTRACT:
To prevent crack occurrence at groove bottoms on both side areas of foam rubber tread of all-season studless tires, the pneumatic tire having a tread surface portion composed of at least two outer and inner rubber layers is characterized in that the hardness of the inner rubber layer lies from 54 to 80 degrees in Shore hardness and is higher than that of the outer rubber layer, and further the outer rubber layer is made of foam rubber with a foam rate from 5 to 50% with at least 10% volume ratio with respect to tread volume. The outer foam rubber layer serves to improve tire performance on icy and snowy roads in winter, and the inner ordinary rubber layer serves to reduce change in groove width after vulcanization, that is, reduce dynamic strain concentration at lateral grooves and therefore to reduce crack generation at the lateral groove bottoms.

REFERENCES:
patent: 1470048 (1923-10-01), Barker
patent: 1719628 (1929-07-01), Sloman
patent: 2302027 (1942-11-01), Havens
patent: 3348597 (1967-10-01), Goldberg et al.
patent: 4006766 (1977-02-01), Takayanagi et al.
patent: 4249588 (1981-02-01), Egan
patent: 4690189 (1987-09-01), Bradisse et al.
Patent Abstract of Japan, vol. No. 191 (M495)(2247) Jul. 4, 1986, & JP-A-61 36003 (Suzuki Motor Co. Ltd.) Feb. 20, 1986.

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