Heavy duty pneumatic tire having tread with shoulder ribs

Details Heavy duty pneumatic tire having tread with shoulder ribs Heavy duty pneumatic tire having tread with shoulder ribs

1990-04-13

1994-12-20

Knable, Geoffrey L.

Resilient tires and wheels

Tires, resilient

Anti-skid devices

B60C 1106

Patent

active

053738810

ABSTRACT:
A heavy duty pneumatic tire including in its tread at least one circumferential main groove and shoulder rib grooves spaced from the circumferential main groove and arranged in the proximity of tread ends to define shoulder rib grooves. The shoulder rib grooves are formed to fulfill relationships of Rw/W=0.28-0.42, Rs/W=0.05-0.12 and Rd/W=0.07-0.19, where a distance from an equatorial plane to the tread end of the tire is W mm, a distance from the tread end to the shoulder rib groove is Rw mm, a width of the shoulder rib groove is Rs mm and a depth of the shoulder rib groove is Rd mm. Angles .alpha. and .beta. made by normal lines to surfaces of the tread and opposite walls of the shoulder rib grooves are in relations -7.degree..ltoreq..alpha. and .beta..ltoreq.7.degree., respectively.

REFERENCES:
patent: 3727661 (1973-04-01), Hoke
patent: 3893498 (1975-07-01), Wayne
patent: 4230512 (1980-10-01), Makino et al.
patent: 4345632 (1982-08-01), Takigawa et al.
patent: 4756352 (1988-07-01), Ogawa et al.
1978 Tread Design Guide, vol. 13, 1978, p. 132.

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