摘要:
A bead portion of a tire has a short fiber reinforcing rubber layer extending along a side surface of a rubber bead apex from a bead core to a height position which is lower than the radially outer end of the bead apex rubber. The short fiber reinforcing rubber layer has short fibers compounded in an amount of 10 to 30 parts by weight with respect to 100 parts by weight of the rubber, and the short fibers are oriented in the tire circumferential direction.
摘要:
A tubeless pneumatic tire is provided including a carcass having a carcass cord web and topping rubber layers covering the opposite sides of the carcass cord web, the carcass extending from a tread portion through a sidewall portion to a bead portion and turned up around a bead core outwardly from the inside of the tire in the axial direction of the tire, wherein only the inner one of the topping rubber layers which faces the inside of the tire is made of a butyl-based rubber.
摘要:
A tubeless pneumatic tire is provided including a carcass having a carcass cord web and topping rubber layers covering the opposite sides of the carcass cord web, the carcass extending from a tread portion through a sidewall portion to a bead portion and turned up around a bead core outwardly from the inside of the tire in the axial direction of the tire, wherein only the inner one of the topping rubber layers which faces the inside of the tire is made of a butyl-based rubber.
摘要:
A studless tire comprises a tread provided with a plurality of blocks and at least one rib provided with first sipes and second sipes each extending across the rib. The first sipes and second sipes are alternately arranged in the longitudinal direction of the rib at circumferential pitches Pc in a range of from 0.028 to 0.04 times a ground contacting width of the tread. Each of the first sipes and second sipes comprises a deep central part, a shallow part on one side thereof and a mid-depth part on the other side thereof, wherein the deep central part has a depth in a range of from 0.70 to 0.80 times a depth of a main longitudinal groove defining the rib, the mid-depth part has a depth being in a range of from 0.40 to 0.60 times the depth of the main longitudinal groove, and the shallow part has a depth in a range of from 0.04 to 0.35 times the depth of the main longitudinal groove. The shallow part and mid-depth part of each first sipe are positionally reverse to those of the second sipes so that, on each side of the rib, the shallow parts alternate with the mid-depth parts.
摘要:
A pneumatic tire comprises: a carcass ply extending between bead portions and including a topping rubber layer, the topping rubber layer facing the inside of the tire and made of a butyl rubber compound containing at least 10 parts by weight of butyl rubber or butyl rubber derivative; and a belt disposed radially outside the carcass in the tread portion, the belt comprising at least one ply of monofilament cords laid at an angle of from 10 to 40 degrees with respect to the circumferential direction of the tire, and each of the monofilament cord consisting of a single filament. The belt further comprises one ply of multifilament cords or one ply of monofilament cords. The height of a bead apex, which is disposed between a carcass ply turnup portion and main portion in each bead portion, can be reduced into a range of from 10 to 20 mm, and in this case, the carcass ply turnup portion is extended radially outwardly beyond the radially outer end of the bead apex so as to adjoin the carcass ply main portion.
摘要:
A pneumatic tire has a block pattern which is divided by a center main groove extending straight on the tire equator, two outer main grooves extending straight outside the center main groove, inner lateral grooves crossing between the center and outer main grooves, and outer lateral grooves crossing between the outer main grooves and tread edges so as to make two inner block rows and two outer block rows. The outer lateral grooves cross the outer main grooves, and the inner lateral grooves cross the center main groove at an inclination opposite to an inclination direction of the outer lateral grooves.
摘要:
A pneumatic radial tire comprises a breaker-belt disposed radially outside a carcass, and a band-belt disposed radially outside the breaker-belt and having organic fiber cords laid in substantially parallel with the tire equator. In the meridian section of the tire which is mounted on a standard rim and inflated to 0.5% of a standard inner pressure, the tread has a triple radius profile and the band-belt having a variable ply number accommodated to the triple radii of the tread such that the number of plies throughout more than sixty percent (60%) of the axial width of the parts of the tread having the first, second and third radii of curvature, respectively, are different from each other. The tread profile is composed of a central part of a radius R1, a pair of middle parts of a radius R2, and a pair of shoulder parts of a radius R3. For example, the ply number N1 in the central part is 0, the ply number N2 in the middle parts is 1, and the ply number N3 in the shoulder parts is 2.
摘要:
A tubeless pneumatic tire is provided including a carcass having a carcass cord web and topping rubber layers covering the opposite sides of the carcass cord web, the carcass extending from a tread portion through a sidewall portion to a bead portion and turned up around a bead core outwardly from the inside of the tire in the axial direction of the tire, wherein only the inner one of the topping rubber layers which faces the inside of the tire is made of a butyl-based rubber. The tubeless pneumatic tire is of lightened weight and exhibits anti-airleak property comparable or superior to that of conventional one even if it is provided with no inner liner.