Sumitomo Rubber Industries Patente

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A tyre comprises a tread portion (2); the tread portion (2) includes a ground contacting surface (2s) and at least one main groove (3) recessed from the ground contacting surface (2s) and extending continuously in a tyre circumferential direction; at least one of groove walls (11) of the main groove (3) is provided with a recessed portion (15) recessed outwardly in a groove width direction from a corresponding groove edge (3e) of the main groove (3) on the ground contacting surface (2s); the ground contacting surface (2s) has a protruding portion (20) in a region where the recessed portion (15) is projected outwardly in a tyre radial direction.

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In a tire (2) for a two-wheeled automotive vehicle, a carcass ply (24) is extended on and between one bead (8) and the other bead (8) along inner sides of a tread (4) and sidewalls (6), and includes a main portion (24a) and turn-up portions (24b), which are formed by the carcass ply (24) being turned up around the beads (8) from an inner side toward an outer side in an axial direction. An outer end Pp of each turn-up portion (24b) is positioned outward of a tread end Pe in a radial direction. A band (14) is positioned between a belt (12) and the tread (4), such that the band (14) covers the belt (12). An outer end PI of an inner layer (28) layered over a carcass (10) and the outer end Pp of the turn-up portion (24b) are positioned facing each other.

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In a tire 2, a band 12 is disposed between a tread 4 and a carcass 10 in a radial direction, and is layered over the carcass 10. A first carcass ply 30 of the carcass 10 has a main portion 30a and turned-up portions 30b. A second carcass ply 32 of the carcass 10 is disposed outward of the main portion 30a of the first carcass ply 30 in the radial direction, and is extended on and between one of the beads 8 and the other of the beads 8. Ends P2 of the second carcass ply 32 are disposed between the beads 8 and the turned-up portions 30b, respectively, on outer side in the axial direction. Ends P1 of the turned-up portions 30b are disposed between the main portion 30a and the band 12. The turned-up portions 30b and the band 12 are layered over each other.

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A heavy-duty tire 1 comprises a tire sidewall (K) provided on a surface (Ks) thereof with a belt-like shaped serration 20 extending in a tire circumferential direction. The serration 20 is formed of a plurality of radially extending ridges 22 arranged adjacently in the tire circumferential direction.

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An object of the present invention is to provide a golf ball having excellent shot feeling on driver shots. The present invention provides a golf ball comprising a core and at least one cover covering the core, wherein the core is formed from a core rubber composition containing (a) a base rubber containing a polybutadiene, (b) an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator, and (d) a terpene-based resin.

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In a tire 2, a band 14 has a helically wound structure in which a strip 26 having a cord 28 is wound in a circumferential direction. The band 14 includes a center portion C disposed at a center in an axial direction, and a shoulder portion S disposed outward of the center portion C in the axial direction. A pitch Pc of the strip 26 in the center portion C is not less than 2.0 times a width W of the strip 26 and not greater than 2.5 times the width W. A pitch Ps of the strip 26 in the shoulder portion S is not less than 0.8 times the width W of the strip 26 and not greater than 1.2 times the width W.

A groove bottom 5 is formed symmetrically about a center line (3c) of a circumferential groove 3 in a tread plan view and includes groove bottom protruding portions 7 protruding radially outwardly from a groove bottom reference surface (5A) parallel to a tread surface (2A) at a deepest position of a groove depth (D). The groove bottom protruding portions 7 each has a first groove bottom surface 8 extending radially and a second groove bottom surface 9 having an angle regarding the tyre radial direction larger than the first groove bottom surface 8. Groove walls 6 each includes groove wall protruding portions 11 protruding toward an inner side of the circumferential groove 3 from a groove wall reference surface (6A) as a surface along a tyre circumferential direction at a widest position of a groove width (w). The groove wall protruding portions 11 each has a first groove wall surface 12 extending in a tyre width direction and a second groove wall surface 13 having an angle regarding the tyre width direction larger than the first groove wall surface 12.

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To provided cornering grip and traction performance stably exhibited in traveling on rough terrain the tire includes a tread portion (2) for which a rotation direction (R) and a direction of mounting the tire to a vehicle are specified; the tread portion (2) includes: an outer tread end (T1) and an inner tread end (T2) respectively located on vehicle outer and inner sides when the tire is mounted to the vehicle; a plurality of inclined grooves (3) extending from the outer tread end (T1) to the inner tread end (T2) and inclined, relative to a tire axial direction, in the rotation direction (R) from the outer tread end (T1) toward the inner tread end (T2); and a plurality of separating grooves (5) by which land portions (4) demarcated by the plurality of inclined grooves (3) are each separated into a plurality of blocks (6) in the tire axial direction; over an entire section from the outer tread end (T1) to the inner tread end (T2), each of the plurality of inclined grooves (3) has a shape of a smooth curve and is curved so as to project in the rotation direction (R); in each land portion (4), the blocks (6) include a plurality of longitudinally elongated blocks (7) each having a length (A), along the corresponding separating groove (5), that is larger than a length (B) thereof along the corresponding inclined groove (3).

Tire provided in the tread portion with zigzag shoulder main grooves (5) having a trapezoidal wave form comprising first and second circumferential segments (15) and (16) and first and second oblique segments (17) and (18); and shoulder axial grooves (10) extending from the shoulder main grooves (5) beyond the tread edges (Te). The shoulder axial grooves (10) are respectively smoothly continued to the first oblique segments (17) or the second oblique segments (18) so as to form composite shoulder axial grooves (30) whose groove widths (WS) are smoothly increased toward the axially outside of the tire.