84results about How to "Improve performance on ice" patented technology

The present invention is directed to a pneumatic tire comprising a ground contacting tread, the tread comprising a rubber composition comprising

• • from 30 to 70 parts by weight, per 100 parts by weight of s first elastomer (phr) having a glass transition temperature Tg ranging from about −40° C. to about −10° C. and a solubility parameter ranging from about 4.1 MPa^1/2 to about 4.5 MPa^1/2;
  • from 70 to 30 phr of a second elastomer having a Tg ranging from about −105° C. to about −30° C. and a solubility parameter ranging from about 3.7 MPa^1/2 to about 4.1 MPa^1/2;
  • from 1 to 40 phr of a first plasticizer having a solubility parameter ranging from 3.4 MPa^1/2 to 3.8 MPa^1/2;
  • from 1 to 20 phr of a second plasticizer having a solubility parameter ranging from 4.3 MPa^1/2 to 4.7 MPa^1/2; and
  • from 30 to 150 phr of silica.

A sipe inner wall surface of a sipe is provided with a wavy first concave and convex row, a wavy second concave and convex row arranged in a sipe bottom side from the first concave and convex row so as to be spaced, and structured such that a wavelength is made shorter than the first concave and convex row so as to increase the number of waves, and a third concave and convex row extending toward the sipe bottom side in a branched manner while being inclined to a longitudinal direction side of the sipe with respect to a normal direction of a tread surface, and interposed between the first concave and convex row and the second concave and convex row so as to be connected to both elements.

The present invention relates to a pneumatic tire capable of improving snow and ice performances as well as noise performance. Shoulder pattern blocks are spacedly arranged on the tread portion of the pneumatic tire along the circumference of the tire. The shoulder pattern blocks are formed and divided by a pair of shoulder longitudinal grooves extending at the side closest to the tread ground end along the circumference of the tire, and by shoulder horizontal grooves extending between the tread ground end and the shoulder longitudinal grooves. Multiple reference space elements are configured and formed on the tread portion at two sides of the tire equator respectively along the circumference of the tire. The reference space element is formed by a space reference line, the tread ground end and the tire equator in a surrounding manner, wherein the space reference line runs through an intersection point between the shoulder longitudinal grooves and the shoulder horizontal grooves at one side edge portion of the circumference of the tire and is orthogonal to the tire equator surface. The reference space elements include at least two reference space elements with different tire circumferential lengths. In addition, each reference space element at least has a pin hole for mounting a pin.

The invention provides a pneumatic tire, which can be used on ice and is wear resistant. The tread (2) of the pneumatic tire (1) is provided with a pair of central main ditches (5), a central area (5), and tire shoulder areas (7). The central area (5) and each tire shoulder area (7) are provided multiple patterned blocks (12), which are defined by fine ditches (10) extending along the circumferential direction of the tire and cross ditches (11) extending along the axis of the tire. At least one of patterned blocks (12) is divided into patterned block small sheets (51) and patterned block large sheets (52) by a plurality of sipings (50); wherein the width of the patterned block large sheets (52) is larger than that of the patterned block small sheets (51). In each patterned block (12), the patterned block small sheets (51) and patterned block large sheets (52) are alternatively arranged along the circumferential direction of the tire.

A pneumatic tire includes a pair of first circumferential main grooves formed in the center region of a tread, a pair of second circumferential main grooves formed respectively outward of the corresponding first main grooves, a plurality of first lug grooves which each extend from one of the two shoulder ends of the tread inward in the tire-width direction and communicate with the corresponding first main groove, a plurality of second lug grooves alternately arranged in the tire circumferential direction which each extend from one of the two shoulder ends of the tread inward in the tire-width direction but do not communicate with the corresponding first main groove, a center rib defined between the pair of first main grooves and extends continuously in the tire circumferential direction, a shoulder block row defined between each of the second main grooves and a corresponding one of the shoulder ends and includes a plurality of blocks, and an intermediate block row defined between each of the first main grooves and a corresponding one of the second main grooves. Each intermediate block row includes long blocks each of which has a tire-circumferential-direction length equivalent to the total length of each two blocks included in the corresponding shoulder block row.

Provided is a tire for winter that exhibits exceptional on-ice performance. A tire (1) for winter is provided with a stud pin or a stud pin hole (8). Blocks (20) are sectioned in a tread part (2). Each of the blocks includes a triangular block (30) having a substantially triangular tread. The tread of the triangular block (30) includes a first peak (31) having the smallest interior angle, and a first edge (41) facing the first peak (31). The center (9) of the stud pin or the hole (8) is provided in the first edge (41) side of the triangular block (30).

A pneumatic tire includes a tread surface, a plurality of circumferential main grooves formed on the tread surface and extending in a tire circumference direction, a plurality of lug grooves formed on the tread surface and extending in a tire lateral direction, a plurality of blocks defined by the lug grooves on both sides in the tire circumferential direction and by the circumferential main grooves on at least one end in the tire lateral direction, and narrow grooves formed in the blocks. The narrow grooves include a plurality of bent portions as well as a circumferential narrow groove extending in the tire circumference direction and a lateral narrow groove extending in the tire lateral direction. The lateral narrow groove and the circumferential narrow groove are configured so that at least one thereof is provided in a plurality and includes a plurality of intersection points where the one intersects the other.

As a rubber composition capable of greatly improving on-ice performance while suppressing a decrease in abrasion resistance of a tire, the present invention provides a rubber composition characterizedby the following: containing silica and at least three types of diene-based polymers that form a plurality of mutually incompatible polymer phases; in that a diene-based polymer (B), which is blendedat a quantity of 10 mass% or more relative to the total quantity of the diene-based polymers and which does not have the lowest or the highest glass transition temperature (Tg) among the diene-basedpolymers, is modified by a silicon atom-containing compound, and satisfies the relationship represented by the formula St+Vi/2 <= 33 [in the formula, St is the content (mass%) of bonded styrene in thediene-based polymer (B) and Vi is the quantity (mass%) of vinyl bonds in the conjugated diene compound portion of the diene-based polymer (B)]; and in that the blending quantity of the silica is 25 parts by mass or more relative to a total of 100 parts by mass of the diene-based polymers.

The increase of rubber hardness by the lapse of time is suppressed, and excellent on-ice performance due to porous cellulose particles is suppressed from being decreased. A rubber composition for a tire including 100 parts by mass of a rubber component including a diene rubber, from 0.3 to 20 parts by mass of porous cellulose particles having a porosity of from 75 to 95%, and from 1 to 30 parts by mass of a polymer gel that is crosslinked diene polymer particles having a functional group containing a hetero atom is disclosed. Furthermore, a pneumatic tire having a tread including the rubber composition is disclosed.

According to the process for preparing a vulcanized rubber composition of the invention comprising (a) a step of preparing a master batch comprising a modified conjugated diene polymer and silica, (b) a step of preparing a master batch comprising an isoprene rubber and silica, (c) a step of kneading the master batch obtained in (a) and the master batch obtained in (b), and (d) a step of vulcanizing a kneaded product obtained in (c), wherein the obtained vulcanized rubber composition comprises a phase A comprising a modified conjugated diene polymer and a phase B comprising an isoprene rubber, which are incompatible with each other, an abundance ratio α of silica in the phase A satisfies 0.5≦α≦0.9 (Relation 1), and a proportion β of the modified conjugated diene polymer satisfies 0.4≦β≦0.8 (Relation 2) it is possible to improve performance on ice and abrasion resistance and to provide a vulcanized rubber composition having excellent performance on ice and abrasion resistance, and a studless tire with a tread made using the same.

A pneumatic tire improved in on-ice performance and on-snow performance in good balance. The pneumatic tire includes a tread portion extending in a tire circumferential direction and forming a ring shape, a pair of sidewall portions on both sides of the tread portion, respectively, and a pair of bead portions on inner sides of the sidewall portions in a tire radial direction, respectively. The tread portion includes a plurality of longitudinal grooves extending in the tire circumferential direction and a plurality of lateral grooves extending in a tire width direction. The longitudinal and lateral grooves define a plurality of block rows each including a plurality of blocks. Each of the plurality of blocks included in at least one of the block rows includes at least three closed grooves including at least one first closed groove and at least one second closed groove.

Provided is a pneumatic tire having further improved ice performance achieved by narrow grooves. The pneumatic tire of the present invention is provided, in a tread, with land sections formed by partitioning the tread by grooves, and each of the land sections is provide with narrow grooves in a ground contact surface of the land section. The angle of tilt of the narrow grooves relative to the tire's circumferential direction is set to be larger in end regions located at both sides of a center region in a tire's lateral direction in each of the land sections than in the center region.