Studless tire having lateral grooves

Details Studless tire having lateral grooves Studless tire having lateral grooves

1998-09-30

2000-06-27

Maki, Steven D.

Resilient tires and wheels

Tires, resilient

Anti-skid devices

152902, B60C 1111, B60C 1113, B60C10300, B60C10700

Patent

active

06079464&

ABSTRACT:
A pneumatic tire comprises: a tread rubber having a Shore A hardness of not more than 65 degrees at 20 degrees C.; a tread portion provided with at least one circumferential row of blocks having circumferential edges adjacent to lateral grooves; each of the circumferential edges having a mean inclination angle of 0 to 60 degrees with respect to the tire axial direction; sidewalls of the lateral grooves on one side in the tire circumferential direction each comprising a first upper slope extending from the top of the adjacent block to a first point at a depth h1, while inclining at an angle .alpha.1, and a first lower slope extending from said first point towards the groove bottom, while inclining at an angle .alpha.2 smaller than the angle .alpha.1,; the remaining sidewalls of the lateral grooves on the other side each comprising a second upper slope extending from the top of the adjacent block to a second point at a different depth h2 than said depth h1, while inclining at an angle .beta.1, and a second lower slope extending straight from the second point towards the groove bottom, while inclining at an angle .beta.2 smaller than the angle .beta.1; and the lateral grooves comprising a portion (A) in which the depth h1 is more than the depth h2 but not more than 0.8 times the lateral groove depth, and a portion (B) in which the depth h2 is more than the depth h1 but not more than 0.8 times the lateral groove depth.

REFERENCES:
patent: 2604920 (1952-07-01), Kirby
patent: 3707177 (1972-12-01), Boileau
patent: 4446901 (1984-05-01), Endo et al.
patent: 4735247 (1988-04-01), Makino et al.
patent: 5044414 (1991-09-01), Ushikubo
patent: 5127455 (1992-07-01), Remick
patent: 5417268 (1995-05-01), Kishi
patent: 5526858 (1996-06-01), Ikeda

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