Heavy duty pneumatic radial tire

Details Heavy duty pneumatic radial tire Heavy duty pneumatic radial tire

1978-04-14

1980-07-29

Bertsch, Richard A.

Resilient tires and wheels

Tires, resilient

Anti-skid devices

D12142, B60D 1104

Patent

active

042146186

ABSTRACT:
A heavy duty pneumatic radial tire comprises a tread continuous at its round-shaped shoulders with sidewalls and formed with a plurality of main tread grooves extending circumferentially thereof. The tread is formed with a circumferentially extending narrow groove in zigzag in each end zone of contact surfaces of the shoulders with a road surface under a standard load. The zigzag grooves have a width of 15-30% of that of the main tread grooves, an amplitude of 0.5-2.0% of the tread width and a pitch of 2.0-7.0% of the tread width. Each of the shoulders is formed in its side surface with a series of intermittent circumferential caved portions, such that a distance in an axial direction of the tire between the deepest bottoms of the caved portions is 105-110% of the tread width and the deepest bottoms are located in a circle having a diameter less than that of a circle passing through the bottoms of the main tread grooves. With the arrangement, the tire according to the invention does not cause any irregular wear at the shoulders and can reduce and prevent the railway wear and growth thereof toward the center of the tread, so that the wear-resistance of the tire is remarkably improved.

REFERENCES:
patent: 3698462 (1972-10-01), Jacobs
patent: 3782438 (1974-01-01), Mirtain
patent: 3897813 (1975-08-01), Verdier

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