The Yokohama Rubber Co., Ltd.

Masakazu Okihara

Tomohiko Kogure

Yusaku Miyazaki

Yoshiaki Hashimura

Zenichiro Shida

Naoyuki Katsura

Toru Horikawa

Tuneo Morikawa

Tsuneo Morikawa

A pneumatic tire to be fitted on a wheel wherein a position, in which a disc is connected to a rim, is offset from the cneter of width of the rim toward the outer surface of the wheel, characterized in that a ratio (Ho/Hi) of an attenuation coefficient Ho (=Go.times.tan.delta.o) determined on the basis of an average thickness Go of an outer side wall of the tire on the outer side of the wheel and a loss factor tan.delta.o of the rubber of this side wall to that Hi (=Gi.times.tan.delta.i) determined on the basis of an average thickness Gi of an inner side wall of the tire on the inner side of the wheel and a loss factor tan.delta.i of the rubber of this side wall is set in the range of 1.2-6.5.

Pneumatic tire and wheel with asymmetric structure

A pneumatic tire characterized in that an average thickness G.sub.U of the region of each of side walls which extends from a position corresponding to a widest portion of the tire toward a tread and that G.sub.L of the region of the side wall which extends from the same position toward a bead are set different from each other, the average thickness G.sub.U of the tread-side region being set to not less than 2.5 mm with the average thickness G.sub.L of the bead-side region set to less than 2.5 mm and not less than 1.0 mm.

Pneumatic tire with different side wall thickness in tread-side and

A pneumatic radial tire for a passenger car, which includes a plurality of grooves provided on the surface of a tread and extending at least in a tire circumferential direction and a belt having a double layer structure and provided within the tread, characterized in that the depth of the grooves is in the range of 6.0 to 8.5 mm, the thickness of a rubber under the groove defined as the distance from the bottom of the groove to the outermost belt layer is in the range of 0.5 to 2.5 mm, one of the belt layers comprises aramid fiber cords with the other belt layer comprising steel cords, and the total sectional area, .alpha., of steel wires per 50 mm width of the belt layer comprising steel cords is 5 to 14 mm.sup.2.

Pneumatic radial tire for passenger car

In a pneumatic tire which is to be fitted to a wheel of the type in which connecting position of a disc to a rim is offsetted to a wheel outer side from a center of a rim width, and which has a plurality of blocks on a tread thereof, a pneumatic tire wherein a total contact area C.sub.2 of shoulder blocks on the tire outer side disposed on the offset side of the disc and a total contact area C.sub.1 of shoulder blocks on the tire inner side disposed on the opposite side to the offset side of the disc satisfy the relation, C.sub.1 /C.sub.2 =1.2 to 2.0.

Pneumatic tire with asymmetrical tread shoulders

A pneumatic radial tire for a passenger car, which includes a plurality of grooves provided on the surface of a tread and extending at least in a tire circumferential direction and a belt layer having a double layer structure and provided within the tread, characterized in that the total sectional area, .alpha., of steel wires per 50 mm width of the belt layer is in a range satisfying 5.ltoreq..alpha..ltoreq.9 mm.sup.2, the depth, d, of the grooves is in a range satisfying 6.0.ltoreq.d.ltoreq.8.0 mm, and the thickness, t, of rubber under the grooves defined as the distance from the bottom of the groove to the outermost belt layer is in a range satisfying 1.0.ltoreq.t.ltoreq.2.5 mm.

Pneumatic radial tire for passenger car with defined tread depths

A pneumatic radial tire characterized in that at least two belt layers reinforced with cords of a high elastic modulus extending at an angle of 14.degree.-33.degree. with respect to the circumferential direction of the tire are arranged between a tread and a carcass, at least one of these belt layers being folded back at both end portions thereof toward the equator of the tire so as to wrap both end portions of any remaining belt layers, at least one reinforcing layer which is reinforced with thermally contractible organic fiber cords which extend at substantially 0.degree. with respect to the circumferential direction of the tire being inserted inside of each of the folded portions of the at least one folded belt layer, the width of the reinforcing layers being set to 10-70% of that of each of the folded portions.

Pneumatic radial tire including at least one folded belt layer

A pneumatic tire for automobiles which has a carcass reinforced with polymeric monofilaments of the same or different diameter which are interconnected by radially inwardly curved peripheral extensions thereof to form a cord having a substantially flat transverse cross-sectional configuration as a whole.

Pneumatic tire having a carcass reinforced with a flat cord made of a

A pneumatic tire characterized in that a carcass layer is constructed by arranging non-twisted polyamide monofilament cords each having a flat cross-section such that the major axis of said flat cross-section is disposed along the surface direction of said carcass layer, that said carcass layer is fold up from the inside to the outside of said tire around a bead portion, and that the folded-up end portions are constructed such that the thickness thereof becomes smaller toward the distal end thereof.

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Hiratsuka, Japan

Masakazu Okihara