Patent classifications
B60C11/033
TIRE
In a tire with a specified mounting direction, groove area ratios Rin and Rout in ground contact regions on the vehicle inner and outer sides, respectively, satisfy Rin>Rout, average land portion areas Ain and Aout of intermediate regions Min and Mout on the vehicle inner and outer sides, respectively, satisfy Ain<Aout, the number of blocks Nin and Nout in the intermediate regions Min and Mout, respectively, satisfy Nin≥1.5×Nout, total sipe lengths Sin and Sout in the intermediate regions Min and Mout, respectively, satisfy Sin>Sout, and sipes formed in the intermediate region Min have a three-dimensional structure in a range of 70% or more of a sipe length.
Pneumatic tire
A pneumatic tire comprising a carcass 11, at least one inclined belt layer 13 having a cord extending inclined at an angle of 30° or more relative to the tire circumferential direction, and a tread 15 arranged outward in the tire radial direction of the inclined belt layer 13, wherein a circumferential cord layer 14 arranged inward in the tire radial direction of the tread 15 has a high-rigidity region and a low-rigidity region and the high-rigidity region has a higher negative ratio in a ground contact width of the tread 15 than the low-rigidity region.
Pneumatic tire
In a pneumatic tire, a groove depth H1 of each of first and second inclined lug grooves over an entire region from an opening portion to a corresponding one of first or second circumferential main grooves to a terminating end portion within a center land portion has a relationship with a maximum groove depth Hg of the corresponding one of the first or second circumferential main grooves represented by 0.80≤H1/Hg≤1.00. Additionally, a maximum groove depth H2 of each of first and second lateral grooves has a relationship with a groove depth H1e at a terminating end portion of the corresponding one of the first and second inclined lug grooves represented by 0.70≤H2/H1e≤0.90.
TIRE COMPRISING A TREAD OPTIMIZED FOR GRIP ON SNOW-COVERED GROUND
A tire has a tread comprising at least two tread pattern elements (MA, MB) distributed periodically in the circumferential direction at pitches (PA, PB). Each tread pattern element is formed of three portions (Z1, Z2, Z3), each defining a volumetric element of which the leading edge corner is the one common to the tread surface and is the first to enter the contact patch in which the tire is in contact with the ground. With each leading edge corner being chamfered, in the portions Z1 and/or Z2, and/or Z3, the widths of the chamfers of the leading edge corners (LC.sub.i.sup.A, LC.sub.i.sup.B, i ranging from 1 to 3) satisfy the following inequalities: a) for the portion Z1:
b) for the portion Z2:
and c) for the portion Z3:
TIRE/WHEEL ASSEMBLY
A tire/wheel assembly of the present disclosure includes a tire with a tread portion and a wheel with a rim. The tire is mounted on the rim, and the tire/wheel assembly includes a power reception coil. In the contact patch when the tire/wheel assembly is filled to a prescribed internal pressure and subjected to the maximum load, the rectangle ratio of the ground contact length at a position, in the tire width direction, located 10% of the ground contact width inward in the tread width direction from an edge in the tire width direction to the ground contact length at the center of the contact patch in the tire width direction is 50% or more.
Two-wheeled vehicle tyre
A two-wheeled vehicle tyre includes a tread portion being provided with a belt layer and a tread rubber disposed radially outwardly of the belt layer. The belt layer includes steel cords oriented along a tyre circumferential direction. The tread rubber includes a cap rubber forming a tread surface and a base rubber disposed radially inwardly of the cap rubber, wherein 300% modulus (M300c) of the cap rubber is greater than 300% modulus (M300b) of the base rubber, and loss tangent (tan δc) of the cap rubber is smaller than loss tangent (tan δb) of the base rubber.
Tire with improved snow performance without sacrificing dry braking or wear
Embodiments of the disclosure include pneumatic tires having improved snow performance. Said tires include a cap ply extending at least partially across a full width of at least one of the belt plies and having a rupture force greater than 210 N per 15 mm of cap ply width. A shoulder rib includes a compliance groove or sipe extending primarily in a circumferential direction and to a depth equal to or less than 75% of the skid depth. The lateral sipes and grooves are arranged to provide an average lateral feature spacing of less than 15 mm. The average inclination angle for the lateral grooves is greater than 6 degrees in the shoulder ribs and is greater than 20 degrees in the central ribs. A longitudinal non-lateral sipe edge density is greater than 21.1 micrometers/mm.sup.2. A longitudinal lateral sipe edge density for all lateral sipes is greater than 5.5 micrometers/mm.sup.2.
MOTORCYCLE TIRE
A motorcycle tire includes a tread portion including a crown portion that is a region of 50% of a tread development width centered on a tire equator, a first shoulder portion that is an outer region of the crown portion, and first lateral grooves. Each lateral groove includes a first groove portion in the crown portion, a second groove portion in the first shoulder portion, and a third groove portion connecting the first and second groove portions. A groove depth and a groove width of the third groove portion are respectively smaller than groove depths and groove widths of the first groove portion and the second groove portion, respectively. More than 80% of a tire axial length of the third groove portion is in the first shoulder portion.
Agricultural Vehicle Tire Comprising a Single-Layer Carcass Reinforcement
A tire for an agricultural vehicle (1), and in particular the carcass reinforcement (4) thereof, for a tire running at low pressure on loose ground, is to reduce the compaction of the ground and to increase the traction capability by reducing the structural stiffness of the tire. According to the invention, the carcass reinforcement (4) is made up of a single carcass layer (41) having a mean thickness E at most equal to 2 mm and a breaking strength Fr, expressed in daN/cm, that satisfies the relationship:
Fr>=Fs=(Cs*Pmax*10.sup.−3)*((R.sup.2−((R+Rj)/2).sup.2)/2)/Rj, with Fs: reference threshold strength (in daN/cm) Cs: safety factor at least equal to 1, Pmax: recommended maximum inflation pressure (in kPa), R=D/2: outside radius of the tire (in mm), Rj=Dj/2: nominal radius of the rim (in mm).
Tire Tread for a Heavy Construction-Plant Vehicle
A Tire tread with blocks for a heavy construction-plant vehicle, to improve the compromise between traction on muddy ground and lifetime in terms of wear on rough ground. A tread (1) has blocks (4), which are separated by cuts (3) and raised with respect to a bottom surface (5). Any block (4) have a contact face (41) having a polygonal shape of surface area SC, which is contained in a tread surface (2), lateral faces (42), and a base section (43) , which has a polygonal shape of surface area SB. The contact face (41) of any block (4) has a polygonal shape that is at least partially concave, wat least two consecutive sides (411, 412) that form between them an interior angle A1 of the polygonal shape that is greater than 180° and the surface area SC of the contact face (41) is at most equal to 0.9 times the surface area SB of the base section (43).