US 6,637,487 B2Granted

Pneumatic tire

AssigneeSumitomo Rubber Industries, Ltd.

InventorsShinichi Miyazaki, Takeshi Ohta, Kazumi Yamazaki, Takuji Kusumoto, Osamu Toda

Life of this patent

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Abstract

A pneumatic tire comprises the following belt (A) or belt (B). The belt (A) comprises a ply made of waved monofilament steel cords and a ply made of multi-filament steel cords, wherein the waved monofilament steel cord is (1) spirally waved so that the wave pitches PA are in a range of from 14 to 50 mm and the amplitude HA of each wave is in a range of from 0.002 to 0.02 times the pitch PA of the wave, or (2) two-dimensionally waved so that the wave pitches PB are in a range of from 5 to 50 mm, and the amplitude HB of each wave is in a range of from 0.002 to 0.05 times the pitch PB of the wave. The belt (B) comprises two plies made of waved monofilament steel cords, wherein the waved monofilament steel cord is waved so that the wave pitches P are in a range of from 0.008 to 0.08 times the circumference of the tire and the wave height of each wave is in a range of from 0.002 to 0.025 times the pitch P of the wave.

Claims7

Dependent claims

A pneumatic tire comprising:

a carcass extending between bead portions through a tread portion and sidewall portions, and
a belt disposed radially outside the carcass in the tread portion, said belt composed of at least two plies across the tread portion which include a radially outmost monofilament-cord ply and a radially inner multifilament-cord ply,
the monofilament-cord ply made of monofilament cords laid at an inclination angle of from 15 to 30 degrees with respect to the tire circumferential direction,
the multifilament-cord ply made of multi-filament cords laid at an inclination angle of from 15 to 70 degrees with respect to the tire circumferential direction,
each said multi-filament cord made of a plurality of steel filaments twisted together,
each said monofilament cord being a steel monofilament having a substantially circular cross sectional shape and a cross sectional area of from 0.09 to 0.30 sq. mm,
each said monofilament cord spirally waved so that the wave pitches PA are in a range of from 14 to 50 mm, and the amplitude HA of each wave is in a range of from 0.002 to 0.02 times the pitch PA of the wave.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/742,406Filed 22 Dec 2000
Published: US 2001/0018942 A16 Sep 2001
Granted: 28 Oct 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

B60C 9/0007
Reinforcements or ply arrangement of pneumatic tyres: reinforcements made of metallic elements, e.g. cords, yarns, filaments or fibres made from metal
B60C 9/0064
Reinforcements or ply arrangement of pneumatic tyres: reinforcements comprising monofilaments
B60C 9/2006
Characterised by the materials of the belt cords: consisting of steel cord plies only
B60C 9/2009
Characterised by the materials of the belt cords: comprising plies of different materials