Abstract:
A pneumatic tire for mounting on an aircraft wheel has a radial carcass and flipper reinforcement. The tire has a pair of bead cores, at least two or more axially inner plies greater than or equal to, extending between the bead cores, a crown reinforcement radially outward of the plies having a maximum belt width BW, and at least one flipper reinforcement wrapped around each bead core. Each bead core has a radially extending cross sectional length B. Each flipper reinforcement extends along an inner surface of the bead core to the axially inner end located in an area that is between 0.01 BW to 0.25 BW as measured from the belt edge toward a centerline of the tire preferably in the range of 0.05 BW to 0.125 BW and wherein one flipper reinforcement has an axially outer end lower than the top of the bead core.
Abstract:
A method of manufacturing a radial aircraft tire which has a casing with a belt reinforcing structure overlying a carcass reinforced with radially extending cord reinforced plies and a tread. The tread has four main grooves extending circumferentially continuously around the tire defining five ribs. The main grooves include two inner main grooves disposed on each side of a central rib Y and two outer main grooves defining a pair of intermediate ribs between inner and outer main grooves and a pair of shoulder ribs, X, Z; in each shoulder region of said tire axially outward of an outer main groove. The invention teaches superior tread wear is achieved when the following relationships are fulfilled when the tread surface of the normally rated inflated tire under rated load contacts with a flat surface: ( XA + XD ) + ( ZA + ZD ) ( XB + XC ) + ( ZB + ZC ) = 0.5 to 1.05 . 1 ( XA + XB + XC + XD ) + ( ZA + ZB + ZC + ZD ) TotalNetArea = 0.34 to 0.75 . 2 where the contacting surface portion of the tread is divided into four equal lengths A, B, C, D at the equatorial center-plane and extending axially outwardly therefrom and the shoulder ribs X and Z are each divided into four distinct contact areas within each respective region A, B, C, D the contact areas within each respective region A, B, C, D the contact areas being XA, XB, XC and XD in rib X and ZA, ZB, ZC and ZD in rib Z. In one alternative embodiment the relationship can also be applied to a five groove tire having one main groove on the equatorial plane of the tire.
Abstract:
A pneumatic tire having a carcass and a belt reinforcing structure wherein the belt reinforcing structure is a composite belt structure having at least one radially inner spiral layer and at least one zigzag belt reinforcing structure located radially outward of said spiral layer. The zigzag belt width is preferably narrower than the spiral layer.
Abstract:
A radial aircraft tire has a casing with a belt reinforcing structure overlying a carcass reinforced with radially extending cord reinforced plies and a tread. The tread has four main grooves extending circumferentially continuously around the tire defining five ribs. The main grooves include two inner main grooves disposed on each side of a central rib Y and two outer main grooves defining a pair of intermediate ribs between inner and outer main grooves and a pair of shoulder ribs, X, Z; in each shoulder region of said tire axially outward of an outer main groove. The invention teaches superior tread wear is achieved when the following relationships are fulfilled when the tread surface of the normally rated inflated tire under rated load contacts with a flat surface: 1. ( XA + XD ) + ( ZA + ZD ) ( XB + XC ) + ( ZB + ZC ) = 0.5 to 1.05 2. ( XA + XB + XC + XD ) + ( ZA + ZB + ZC + ZD ) TotalNetArea = 0.34 to 0.75 where the contacting surface portion of the tread is divided into four equal lengths A, B, C, D at the equatorial center-plane and extending axially outwardly therefrom and the shoulder ribs X and Z are each divided into four distinct contact areas within each respective region A, B, C, D the contact areas within each respective region A, B, C, D the contact areas being XA, XB, XC and XD in rib X and ZA, ZB, ZC and ZD in rib Z. In one alternative embodiment the relationship can also be applied to a five groove tire having one main groove on the equatorial plane of the tire.
Abstract:
A pneumatic radial ply tire 100 for use on aircraft has a radial reinforced carcass 20 having at least one axially inner ply 2A, 2B, 2C and 2D of textile cords 21 wound around a pair of bead cores 33. The improved bead structure 30 has a flipper 50 having an axially inner leg LI and axially outer leg LE. The ends LI, LE of the flippers 50 are above the bead core height Bh and below the apex A of an elastomeric strip 40 satisfying the relation Bh
Abstract:
A pneumatic tire comprises a carcass comprising one ply of cords extending between the bead portions through the tread portion and sidewall portions and turned back in each said bead portion from the axially inside to the axially outside of the tire and wound around the bead core so as to form a pair of wound portions and a main portion therebetween, wherein a radially outer part of the wound portion, which is defined as extending axially inwards along the radially outer face of the bead core, has a certain length when measured along the radially outer face which is not less than 0.5 times the width of the radially outer face, and an organic fiber cord layer is disposed between the radially outer part and the radially outer face of the bead core, and a distance between the cords of the radially outer part and the radially outer face of the bead core in a normal direction to the radially outer face is in a range of from 0.05 to 1.0 times the section height of the bead core.
Abstract:
A heavy duty radial tire which comprises a tread portion, a pair of sidewall portions, a pair of bead portions, a carcass extending between the bead portions and composed of a single ply of steel cords arranged radially at an angle of from 70 to 90 degrees with respect to the tire equator, and a belt disposed radially outside the carcass in the tread portion and composed of two cross plies of steel cords laid parallel with each other at an angle of from 0 to 45 degrees with respect to the tire equator, wherein in at least the central part of the tread portion having 50% of the axial width of the belt, the total amount of steel in the belt plies being in the range of from 6 to 10 times the steel amount in the carcass ply, and the thickness of rubber between the radially adjacent belt cords and carcass cords is in the range of from 0.7 to 3.0 mm. Preferably, the two belt plies are made of substantially the same amount of steel in the central part.
Abstract:
A pneumatic tire for high speed and heavy duty use, in which durability of the bead and lower sidewall region is improved. The tire includes: a carcass comprising a radial ply of cords turned up around bead cores from the axially inside to the outside, the carcass cords rubberized with a topping rubber having a 100% modulus of 40 to 70 kg/cm.sup.2, an elongation at rupture of 200 to 350%, and a stress at rupture of 150 to 300 kg/cm.sup.2 ; a rubber bead apex disposed between the carcass main portion and each turned up portion; a buffer cord layer interposed between the carcass main portion and each turned up portion, the buffer cord layer extending radially inwardly to the bead portion to form an axially inner portion and then turned up around the bead core to form an axially outer portion, the axially inner portion having a radially outer edge located radially outward of the radially outer edge of the carcass turned up portion and radially inward of the maximum tire section width point, the axially outer portion having a radially outer edge located radially inward of the middle height position of the bead apex; in a normal pressure condition, at least 60%, in number, of the spacings of reinforcing cords existing in a tire side portion defined between two points (P1 and P2) are in the range of 0.25 to 2.0 times the thickness (D) of the carcass cords, the reinforcing cords including the carcass cords and the buffer cords.
Abstract:
A heavy duty high speed cross ply tire has a carcass composed of at least one aromatic polyamide fiber cord ply, the product T.sqroot.D of the cable twist number T (turns/10 cm) of the belt cord and the square root of the total denier number D (deniers) of the cord is 2.466.times.10.sup.3 to 3.036.times.10.sup.3 and the elongation E (%) at breakage of the belt cord divided by the total denier number D is 7.78.times.10.sup.-4 to 12.22.times.10.sup.-4.
Abstract:
This invention relates to high-speed radial tires, and more particularly to radial tires wherein the thickness ratio (Gc-Gs)/Gc, that is the ratio of the difference between the crown tread thickness Gc, which is a thickness of the tread on the equator of the tire, and the shoulder tread thickness Gs, which is a thickness of the tread of the ground contact surface at the outer edge in direction of the tire axis, to the crown tread thickness Gc is set to be 0 or more and 0.8 or less. By setting the ratio within a range of 0 to 0.8, the force Fs acting in the radial direction on the tread shoulder part, out of the total load acting to the tire, is decreased, thus, the deformation in the bead part is diminished and the permanence in the bead part can be improved. In a tire having the ratio of 0 to 0.8, by setting the angle of the belt cords to be 0 to 20 degrees, it can be used for aircraft and by setting the angle of the belt cords to be 20 to 40 degrees and the aspect ratio to be 60% or less, it can be used for high-speed passenger cars.