Abstract:
A tire capable of reducing a resistance to a fluid in a groove to improve the wet performances. By forming smaller grooves (or riblets 20) having a depth set within a range of 0.01 to 0.5 mm at a pitch within a range of 0.01 to 0.5 mm in the walls of a circumferential groove and a transverse groove, more specifically, the resistance to the water flowing in the groove is reduced to improve the drainage efficiency of the groove. By arranging a turbulence generating zone having a number of pointed projections at the groove side faces at the confluence between the circumferential groove and the transverse groove, on the other hand, there is suppressed the separation of the water flow in the vicinity of the confluence. With these constructions, it is possible to improve the wet performances of the tire better than the prior art.
Abstract:
A pneumatic tire with an improved tread portion capable of reducing a pass-by noise with improving wet performances is disclosed, wherein a central region Y1 of the tread between a pair of first circumferential lines X1 is provided with a wide circumferential groove having a width W1 of from 0.05 to 0.15 times the ground contacting width TW; a pair of middle regions Y2 between the first circumferential lines X1 and second circumferential lines X2 and a pair of shoulder regions Y3 axially outward of the second circumferential lines X2 are not provided with a circumferential groove but axial grooves, the axial grooves extending from the central region Y1 to tread edges and intersect the first circumferential lines X1 at an angle .theta.1 of from 10 to 25 degrees and the second circumferential lines X2 at an angle .theta.2 of from 30 to 45 degrees; and each first circumferential line X1 drawn on each side of the tire equator at an axial distance L1 of 0.1 to 0.15 times the width TW, and each second circumferential lines X2 drawn on each side of the tire equator at an axial distance L2 of from 0.325 to 0.375 times the width TW.
Abstract:
A run-flat radial ply pneumatic tire 10 has a carcass structure reinforced with pairs of elastomeric sidewall fillers 42,46,48 and at least three bead cores 26,26' and 37. At least one bead core 37 lies axially between the lateral edges of the tread 12 and extends radially inwardly of the tread 12 and reinforcing belts 36 and radially outwardly of the first and second bead cores 26,26' and a carcass reinforcing structure 30. In several embodiments improved wet traction tread designs are employed.
Abstract:
A pneumatic radial tire provides enhanced noise reduction and water releasing ability during driving by repetitious process of trapping air into the circumferential groove, formed on the tread as the air therein gets compressed and expanded before it gets released. The pneumatic tire includes a rib-lug tread pattern formed by circumferential grooves and several axial grooves at a slant angle relative to the circumferential grooves.
Abstract:
A tire and tread pattern in which the residual cornering force is minimized. The tread pattern comprises: a plurality of design cycles, each comprising a first sub-design-unit (SA) and a second sub-design-unit (SE), the first sub-design-unit (SA) comprises lateral grooves which are inclined to the same direction, the second sub-design-unit (SE) comprises lateral grooves which are inclined to the same direction but the reverse of the first sub-design-unit, the first sub-design-unit (SA) is a mirror image of the second sub-design-unit (SE), and the inclination angles of the lateral grooves in each of the sub-design-units (SA and SE) to the axial direction of the tire are gradually decreased from the circumferential center (M) to each edge (L) of the sub-design-unit.
Abstract:
An asymmetric tire tread is divided circumferentially into first, second, and third zones. The edge between the second and third zone in the tire is in the center of an aquachannel.
Abstract:
A tread (12) for a light truck or automobile tire (10) has a continuous rib (30, 32) between an adjacent piece of circumferentially continuous grooves (20, 22, 24). The tread (12) has a plurality of hook-shaped semi-blind grooves (40) originating from the circumferentially continuous grooves (20, 22, 24). Each rib (30, 32) has two rows of circumferentially spaced hook-shaped semi-blind grooves (40).
Abstract:
A pneumatic tire comprises a tread portion provided with at least one wide circumferential groove, the wide circumferential groove extending continuously in the tire circumferential direction and having a groove width GW of not less than 5% of the ground contacting width TW, the wide circumferential groove provided in the groove bottom with a groove bottom rib, the groove bottom rib extending continuously along the overall length of the wide circumferential groove, the groove bottom rib having a height Hr in a range of from 0.5 to 3.0 mm and a base width Wr in a range of from 10 to 30% of the groove width GW, and the groove bottom rib provided in the top face with a small groove having a depth Dr of less than the height Hr.
Abstract:
A heavy duty pneumatic tire comprises a tread provided with plural circumferential grooves, land portions defined by these circumferential grooves, and a groove fence portion formed in the circumferential groove so as to extend in a direction blocking the circumferential groove, in which the groove fence portion comprises at least two protrusions extending from a groove wall and/or groove bottom of the circumferential groove, and has given spaces between the protrusions in widthwise and circumferential directions of the tire.
Abstract:
A pneumatic tire having a tread portion with a convex profile, a pair of axially spaced bead portions, and sidewall portions extending therebetween. The tread portion is provided with a pair of circumferentially extending continuous grooves defining groove edges with a combined width of more than 16% of the ground contacting width. The tire design reduces overall tire noise, especially air resonance without deteriorating tire performance on wet surfaces.