Abstract:
A tire is described which has a tread pattern provided with a large central channel (2) interposed between two continuous circumferential ribs (8), and a pair of large circumferential grooves (4) located at symmetrically opposite positions relative to the central channel (2). Also provided are transverse grooves (3) having a symmetrically converging inclined extension, the axial inclination of which increasingly grows larger towards the central channel (2). The longitudinal grooves (4) each consist of a sequence of oblique portions (4a) giving the grooves a broken-line course, so that each land portion or block (5, 6) delimited by the grooves (3, 4) has a corner (5a, 6a) projecting inwardly of the corresponding circumferential groove (4) with respect to the opposite corner (5b, 6b) of the circumferentially adjacent block.
Abstract:
A pneumatic tire comprises a tread portion provided with a pair of circumferential grooves and axial grooves extending from the circumferential grooves to tread edges, each of the axial grooves extending along a parabola of which the parabola axis extends parallel to the tire axial direction and the parabola vertex is disposed on the axially outer edge of the circumferential groove and the parabola focus disposed axially outward of the parabola vertex, and the axially outer edge of the axial groove extending on the parabola from the parabola vertex to the tread edge, whereby a flow of water is improved and thus a flow of air is also improved to improve wet performances without increasing tire noise.
Abstract:
A pneumatic tire provided with a tread pattern, said tread pattern including a wider circumferential straight groove dividing the tread into right and left sides and having 7-25% of the width of the tread, a pair of circumferential ribs provided adjacent to right and left sides of the wider circumferential straight groove, respectively and each having 2.5-15% of the width of the tread, and a pair of narrower circumferential straight grooves provided adjacent to and axially outside the circumferential ribs, respectively, and each having a groove width being 0.5 to 5% of that of the tread and a groove depth being 50 to 100% of that of the wider circumferential straight groove, wherein: each of the circumferential ribs is provided with a plurality of sipes extending obliquely relative to the circumferential direction while being spaced in the circumferential direction, a depth of each sipes being 25 to 100% of the groove depth of the wider circumferential straight groove.
Abstract:
A tread design for a pneumatic tire of radial construction for high-speed vehicles is provided. The tire has a height-to-width ratio of .ltoreq.0.6 with a tread design that is tied to the direction of rotation. The tread design comprises profiled elements that are steeply oriented in the circumferential direction at an angle to the equatorial plane of the tire and are arranged in the shape of V's. The profiled elements extend from a central portion of the tread into shoulder regions of the tire, with the profiled elements being angled-off at a bend region in the shoulder regions in the direction of an axis of the tire. Respective continuous inclined grooves that proceed from the central portion to the shoulder regions are formed between the profiled elements. A circumferentially extending rib is disposed in the equatorial plane and forms two central, circumferentially extending grooves, one on each side of the rib, between this rib and starting portions of the profiled elements. The inclined grooves communicate with these circumferential grooves. In the central portion of the tread, the profiled elements extend at an angle of from 5.degree. to 30.degree. relative to the equatorial plane, while in the shoulder regions, proceeding from the bend regions, the profiled elements extend at an angle of from 65.degree. to 85.degree.. The shoulder regions have a forked configuration.
Abstract:
A pneumatic tire is disclosed in which ABS braking performance on a wet road after being worn is improved. This pneumatic tire includes: a tread pattern whose rotational direction is specified; and a block plotted on a tread by main grooves extending in a tire circumferential direction and lateral grooves extending in a tire width direction, the block having a pair of opposing corners with acute angles and including at least one sipe therein. In the pneumatic tire, a length of the sipe is made gradually longer from a tread surface toward a sipe bottom part and, assuming that the block is equally divided by a boundary of a straight line parallel to the tire circumferential direction into a region U where a corner of the block in the trailing side has an acute angle and a region L where a corner of the block in the leading side has an acute angle, edge lengths LU, LL of the block measured along the main groove in the regions U, L, and distances 1U, 1L from corners of the block in the trailing side to an opening end of the sipe bottom part measured in the regions U, L are set in relations of 0.4nulllL/LLnull0.8, 0.2nulllU/LUnull0.6, lL/LLnulllU/LU.
Abstract translation:公开了一种充气轮胎,其中在穿着后在湿路面上的ABS制动性能得到改善。 该充气轮胎包括:规定旋转方向的胎面花纹; 以及通过在轮胎周向上延伸的主槽和在轮胎宽度方向上延伸的横向槽在胎面上绘制的块,所述块具有一对具有锐角的相对的角,并且在其中至少包括一个刀槽花纹。 在充气轮胎中,刀槽花纹的长度从胎面表面朝向刀槽花纹底部逐渐变长,并且假定将块与平均于轮胎周向的直线的边界相等地划分为区域U,其中 在后侧的块的角部具有锐角和区域L,其中前端中的块的角部具有锐角,沿着区域U中的主槽测量的块的边缘长度LU,LL, L,并且在区域U,L中测量的在后侧的块的块的角部到刀槽花纹底部的开口端的距离1U,1L被设置为0.4 <= LL /LL≤0.8,0.2<= LU / LU <= 0.6,lL / LL> = lU / LU。
Abstract:
A pneumatic tire comprises a tread portion provided with a plurality of longitudinal grooves, each of the longitudinal grooves extending continuously in the tire circumferential direction and having a bottom and a pair of sidewalls defining corners therebetween, the corners being rounded by a circular arc whose radius is not more than 2 mm, the inclination angles of the sidewalls being in the range of not more than 15 degrees with respect to the normal direction to the tread surface line, the bottom being provided with a plurality of ribs which extend in the longitudinal direction of the groove in substantially parallel with each other so that the bottom has a wavy configuration having no angled corner, the heights of the ribs measured from the deepest point of the longitudinal groove being in the range of from 0.5 to 1.0 mm.
Abstract:
A pneumatic tire having an excellent steering stability on wet road surface comprises a tread having an asymmetric directional tread pattern defined by steeply slant grooves and gently slant grooves arranged on at least both side regions, in which so-called directional tread pattern defining a rotating direction (normal rotating direction) of the tire in the mounting of the tire on a vehicle is formed by the steeply slant grooves to contact a side of the groove near to the central region with ground ahead and contact a side apart from the central region with ground afterward. The tread pattern also has gently slant grooves to contact a side of the groove opening to one of tread ends with ground ahead and contact a side of the groove opening to the other tread end with ground afterward.
Abstract:
A directional pneumatic tire having improved wet traction has an annular aqua channel and lateral grooves which direct water from the footprint to the shoulder area of the tire to help prevent hydroplaning. The aqua channel has an extended U-shape wherein one wall of the aqua channel has a steeper incline than the other side of the aqua channel. In a preferred embodiment, the aqua channel may have a step between its shoulder side and its center side wherein the center side is higher by a distance d. In one illustrated embodiment, a center tread portion of the tire, bounded by an aqua channel and a center groove, and two lateral grooves, comprises a single block element.
Abstract:
A pneumatic tire having improved wet traction has lugs containing sipes which change direction within the lug and tie bars in the sipes near each point where the sipes change direction. Siping, and the positioning of tie bars, provide means for minimizing the difference of the principle direction of lug stiffness between individual lugs. Also, a tire of the invention has 4 pitch ratios which are distributed around the tire so that extra large pitches are not located next to small pitches.
Abstract:
A pneumatic tire comprising a tread portion having a plurality of blocks which are defined by inclined grooves and by a plurality of connection groves connecting with the inclined grooves or with the tread end, wherein the side wall portion of a block facing a first inclined groove coming into contact with the ground precedingly is more rigid than the side wall portion of the same block facing a second inclined groove coming into contact with the ground following the first inclined groove, and the side wall portion of the same block located at the inner side in the tire width direction is more rigid than the side wall portion located at the outer side in the tire width direction.