Sumitomo Rubber Industries Patente

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A pneumatic tire (1) has a tread reinforcing layer (7) comprising a net structure formed from a tape (9) of rubber coated reinforcing cord(s). The net structure comprises first oblique segments (15) and second oblique segments (16) of the tape which intersect with each other, forming interspaces (17) therebetween. The first oblique segment has a first axial outer part (15a) in which the angle of the tape with respect to the tire circumferential direction decreases toward one end (20e) in the tire axial direction of the net structure. The second oblique segment has a second axial outer part (16a) in which the angle of the tape with respect to the tire circumferential direction decreases toward the above-said one end of the net structure. The first axial outside part is connected to the second axial outside part directly or through a circumferential segment (14) of the tape.

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A tire (1) is provided with a tread pattern (2) comprising a series of a number N of tread design units (4) arranged repeatedly and circumferentially of the tire in a sequence and having a number m of different circumferential lengths (L). A first pulse train (11) is defined by viewing the tread design units as pulses arranged in the same sequence as the tread design units at intervals which are defined by the circumferential lengths of the corresponding tread design units expressed in term of a ratio to one of the number m of different circumferential lengths. A maximum value Pmax of amplitudes P(k) (k = order from 1 to 2N) of frequencies obtained by Fourier transforming the first pulse train is limited to specific values. The amplitudes P(k) and P(k+1) of every two of the adjacent orders (k) and (k+1) do not satisfy a condition that both of the amplitudes P(k) and P(k+1) have values of 2/3 or more times the maximum value Pmax.

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Provided is a studdable tire that can exhibit excellent on-snow performance as well as on-ice performance.A studdable tire 101 has a tread portion 102 to which a stud 103 is mounted. The tread portion 102 has a designated rotation direction R. The tread portion 102 includes a plurality of blocks 105 and a lateral groove 106 which is adjacent to each block 105 on a rear side in the rotation direction. The lateral groove 106 includes a gently-tilted portion 107 that extends at an angle of not greater than 30 degrees relative to a tire axial direction. The stud 103 is mounted to at least one of the plurality of blocks 105. The stud 103 includes a body embedded in the block 105 and a pin portion 120 that projects from the body in a tire radial direction. The body has a top flange 111 formed in an outer side portion in the tire radial direction. The top flange 111 includes a tapered portion 111A in a planar view. The top flange 111 is disposed such that the tapered portion 111A is oriented toward the rear side of the block 105 in the rotation direction R.

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A pneumatic tyre includes a tread portion, two axially spaced sidewall portions extending radially inwardly from the tread portion, at least one of the sidewall portions being provided with a side protector that protrudes axially outwardly and having an inner end located radially outwardly of a tyre-maximum-width position, and two axially spaced bead portions connected to radially inward of the respective sidewall portions. Each bead portion includes a bead apex rubber having an outer end in the tyre radial direction being located radially inwardly of the tyre-maximum-width position. A radial length of a tyre inner region from a bead baseline to the outer end of each bead apex rubber is in a range of from 0.8 to 1.2 times a radial length of a tyre outer region from a radially outermost position of the tread portion to the inner end of the side protector.

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The circumferential groove 3 has a groove bottom 5 and a pair of groove walls 6. The groove bottom 5 is provided with groove bottom raised portions 7 protruding radially outwardly from a reference plane 5a. The groove bottom raised portions 7 are a first groove bottom raised portion 7A located on a first side s1 in the width direction of the circumferential groove 3 and a second groove bottom raised portion 7B located on a second side s2 in the width direction. The first and second groove bottom raised portions 7A and 7B each comprise a plurality of repeating units 10 comprising a first bottom surface 8 extending substantially in the tire radial direction and a second bottom surface 9 inclined with respect to the tire radial direction at a larger angle than the first bottom surface 8. The inclination direction of the second bottom surfaces 9 of the first groove bottom raised portion 7A is opposite to the inclination direction of the second bottom surfaces 9 of the second groove bottom raised portion 7B.

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Provided is a tire that can improve handling performance.A motorcycle tire 1 includes a tread portion 2 configured to be curved into an arc shape that projects outward in a tire radial direction. The tread portion 2 has a carcass 6 and a tread reinforcing layer 7 thereinside. The tread reinforcing layer 7 is formed by a rubber-coated cord strip 10 being helically wound. The tread reinforcing layer 7 includes a crown region Cr and shoulder regions Sh. The rubber-coated cord strip 10 includes a plurality of reinforcing cords 11 aligned with each other. A distance Ws between the reinforcing cords 11 and 11 which are adjacent to each other in the rubber-coated cord strip 10 wound in each of the shoulder regions Sh is less than a distance Wc between the reinforcing cords 11 and 11 which are adjacent to each other in the rubber-coated cord strip 10 wound in the crown region Cr. Shoulder ends Es are not less than crown ends Ec.