Abstract:
A pneumatic tire having improved wet performances is disclosed, which comprises a tread of a rib type pattern divided into three or more ribs by at least two circumferential grooves so that the tread defines both side regions and the remaining central region by a pair of the circumferential grooves arranged close to both side ends of the tread and is provided at each region with sipes. In this type of the tire, each of the sipes arranged on both side regions is inclined at a small angle with respect to the transverse line of the tire and each of the sipes arranged on the remaining central region is inclined at a small angle with respect to the circumferential line of the tire.
Abstract:
A tread capable of being used in all seasons and weather conditions comprising of a substantially centrally located rib which extends circumferentially about the tire, a plurality of independent projections placed about the remaining portion of the tire. The independent projections are placed so as to provide for two circumferentially extending grooves, one on either side of the central rib and a plurality of laterally extending grooves which extend from each central groove to the tread edge of the tire. The tread has a low net to gross ratio.
Abstract:
A tread for a road vehicle tire having a pattern having a land-to-sea ratio between 65% to 35% and 75% to 25% and a series of diagonally extending grooves, the axially inner ends of which enter the contact patch between tread and ground before the remaining part of the groove in forward movement of the vehicle.
Abstract:
A pneumatic radial tire having tread, outer shoulder, and sidewall portions of elastomeric material over a radial carcass. The tread and outer shoulder portions comprise similar circumferentially overlapping patterns of lugs and grooves. The majority of the edges of the lugs are disposed at an angle of approximately 60.degree. with respect to the equator of the tire. The tire has a groove adjacent each outer shoulder portion and bounded by radially displaced adjacent outer shoulder lug portions and by radially displaced adjacent sidewall lugs. Each such groove adjacent each outer shoulder portion has relatively long sections extending circumferentially of the tire. The tire has a tread having at all points of the tread lug contact area substantially identical surface pressures and has high road holding ability on dry as well as on wet or snow-covered roads. The tire is also effective in draining a substantial volume of water or waterlogged snow and provides improved travel confort.
Abstract:
A radial tire designed for high speeds has a tread comprising blocks arranged in transverse rows and formed with narrow grooves by which adjacent blocks in the same row are closely spaced apart and with transverse grooves each opening on at least one edge of the tread. The transverse grooves are relatively wide in the vicinity of such edge and relatively narrow in the vicinity of the median line of the tread.
Abstract:
A tire has a tread formed with circumferential grooves following curves that are broken or undulating. The amplitudes of the curves increase in a direction from one edge towards the other edge of the tread. Over more than half the width of the tread, the curves followed by the grooves are substantially in phase opposition, and the grooves are connected to each other in such a manner that segments of one groove lie substantially in extensions of segments of an adjacent groove.
Abstract:
A tire includes a tread portion 2. At least one middle lateral groove 10 includes first and second middle tie bars 16 and 17. First and second middle sipes 21 and 22 are provided on a ground-contact surface 15s of at least one middle block 15. The first middle sipe 21 includes a termination end 21a located on an inner side in a tire axial direction with respect to the first middle tie bar 16. The second middle sipe 22 includes a termination end 22a located on an outer side in the tire axial direction with respect to the second middle tie bar 17 and on the inner side in the tire axial direction with respect to the termination end 21a of the first middle sipe 21. On the ground-contact surface 15s of the middle block 15, no groove and no sipe are provided in a first region 23.
Abstract:
A tire is provided with blocks in a tread portion. Each of the blocks has a block wall surface provided with first recesses. Each of the first recesses extends across a block ground contacting surface and the block wall surface. Each of the first recesses has a triangular ground contacting surface opening on the block ground contacting surface and a triangular wall surface opening on the block wall surface. The wall surface opening has a first end terminating without reaching a groove bottom of one of grooves demarcating the each of the blocks.
Abstract:
A tread pattern of a pneumatic tire includes continuous lands provided in half treads on first and second sides, circumferential main grooves, and sipes having a chamfered configuration. The sipes extend inward in a lateral direction from the circumferential main grooves and are closed in the middle of regions of the continuous lands. An edge shape of each of sipes on the first side includes an extending portion extending inward in the lateral direction constantly in an extension direction and a bent portion that is provided to be joined to an end of the first extending portion and that has the edge shape bent from the extension direction of the first extending portion to a direction close to the circumferential direction. Every portion of the first extending portion and the bent portion of the sipes are provided with a main body portion and a sipe chamfered portion.