Pneumatic tire having defined lug groove configuration

Details Pneumatic tire having defined lug groove configuration Pneumatic tire having defined lug groove configuration

1989-08-29

1990-12-18

Ball, Michael W.

Resilient tires and wheels

Tires, resilient

Anti-skid devices

15220900R, B60C 1104

Patent

active

049779427

ABSTRACT:
A pneumatic tire improved in resistance to uneven wear, which has a rib-lug tread pattern comprising longitudinal grooves extending circumferentially of the tire, lug grooves extending axially of the tire to form lugs in tread shoulder regions, and sipes formed in the tread shoulder regions, wherein each lug groove is composed of an outer part having side walls with a single inclination of an angle L3 and an inner part having side walls with a double inclination, each side wall of the inner part is composed of an upper wall inclined at an angle L1 and a lower wall inclined at an angle L2, the angle L1 is more than 35 degrees, the angle L3 is smaller than the angle L1 and the angle L2 is smaller than the angle L3, the length B of the outer part is more than 0.2 and less than 0.4 times the total length A of the lug groove, the depth H1 of the upper walls of the inner part is more than 0.15 and less than 0.50 times the full depth H of the inner part, the axial length W1 of each sipe is less than 0.3 times the length A of the lug grooves at the tread face of the tread.

REFERENCES:
patent: 4122879 (1978-10-01), Takigawa et al.
patent: 4177850 (1979-12-01), Ogawa et al.
patent: 4217942 (1980-08-01), Takigawa et al.
patent: 4840211 (1989-06-01), Makino

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