Radial tires having at least two belt plies reinforced with steel monofilaments
First Claim
1. A pneumatic radial tire comprising:
- (a) a radial carcass having a crown region;
(b) a tread disposed radially outwardly of said crown region; and
(c) at least two belt ply layers located between the tread an the crown region of the carcass, wherein each belt ply is a rubber reinforcing layer having embedded therein a plurality of spaced-apart parallel substantially straight steel monofilaments inclined at an angle between 10°
to 30°
with respect to the equatorial plane of the tire,(d) a gum rubber in a flat or wedge shape disposed between the axially outer edges of said at least two belt ply layers,said monofilaments being laid at and end count ranging from 25 to 60 ends per inch (25.4 mm);
each monofilament having a diameter of from 0.25 to 0.40 mm;
a tensile strength of at least 4080 MPa-(2000×
D)×
95 percent, where D is the filament diameter in millimeters; and
a fatigue resistance of at least 3500 cycles as measured by the three roll bending fatigue test.
9 Assignments
0 Petitions
Accused Products
Abstract
A pneumatic radial tire includes at least two belt plies reinforced with steel monofilaments inclined at an angle of 10° to 30° with respect to the equatorial plane of the tire, the monofilaments being laid at an end count ranging from 25 to 60 ends per inch and having a diameter of from 0.25 to 0.40 mm, a tensile strength of at least 4080 MPa-(2000×D)×95 percent where D is the filament diameter in millimeters and a fatigue resistance of at least 3500 cycles as measured by the three-roll bending fatigue test. Preferably, the filament diameter ranges from 0.30 to 0.35 mm, the tensile strength of each monofilament is at least 4400 MPa-(2000×D)×95 percent and the fatigue resistance ranges from 3500 to 6000 cycles.
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Citations
12 Claims
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1. A pneumatic radial tire comprising:
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(a) a radial carcass having a crown region; (b) a tread disposed radially outwardly of said crown region; and (c) at least two belt ply layers located between the tread an the crown region of the carcass, wherein each belt ply is a rubber reinforcing layer having embedded therein a plurality of spaced-apart parallel substantially straight steel monofilaments inclined at an angle between 10°
to 30°
with respect to the equatorial plane of the tire,(d) a gum rubber in a flat or wedge shape disposed between the axially outer edges of said at least two belt ply layers, said monofilaments being laid at and end count ranging from 25 to 60 ends per inch (25.4 mm);
each monofilament having a diameter of from 0.25 to 0.40 mm;
a tensile strength of at least 4080 MPa-(2000×
D)×
95 percent, where D is the filament diameter in millimeters; and
a fatigue resistance of at least 3500 cycles as measured by the three roll bending fatigue test. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification