Sumitomo Rubber Industries Patente

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Provided is a pneumatic tire having a specific tire size and having an enhanced rim-mounting workability. The present invention is directed to a pneumatic tire to be mounted on a rim R and used. The rim R has a rim diameter RD of 10 to 18 inches. A ratio SH/SW of a cross-sectional height SH of the tire to a cross-sectional width SW of the tire is 0.30 to 0.45. A ratio RW/SW of a rim width RW of the rim R to the cross-sectional width SW of the tire is 0.78 to 0.99. The pneumatic tire includes a pair of bead portions 4 in which respective bead cores 5 are embedded. A cross-sectional width Wb (mm) in a tire axial direction of at least one of the bead cores 5 satisfies expression (1) described below. Wb≤21×SH/SW

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A tire comprising a tread part (1) and a sidewall part (32), wherein the tread part and the sidewall part are each composed of a rubber composition comprising a rubber component comprising a hydrogenated styrene-butadiene rubber, and wherein L is 0.60 or more and 0.90 or less, and (St1 +St2)×T×L / 100 is 1.4 or less, where St1 represents a total styrene amount, in % by mass, of a rubber component constituting the tread part, St2 represents a total styrene amount, in % by mass, of a rubber component constituting the sidewall part, L represents a land ratio, and T represents a thickness, in mm, of a rubber layer constituting the sidewall part.

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A tread portion 2 includes a plurality of circumferential grooves 3 continuously extending in a tire circumferential direction, and a plurality of land portions 4 demarcated by the plurality of circumferential grooves 3. The plurality of land portions 4 include at least one pattern land portion 6 on which axial grooves 5 are arranged in the tire circumferential direction with a number of pitches N so as to extend in a tire axial direction. In a load-applied state where a load that is 80% of a standardized load is applied in a state where a pneumatic tire 1 is fitted on a standardized rim and adjusted to a standardized internal pressure, a ground-contact surface shape of the tread portion 2 has a first tread end Te1, a second tread end Te2, and a first ground-contact end edge 7 extending from the first tread end Te1 to the second tread end Te2 on one side in the tire circumferential direction. A first straight line 7a connecting both ends in the tire axial direction of a portion, of the first ground-contact end edge 7, traversing the pattern land portion 6 satisfies a predetermined formula (1).

The present invention is an invention relating to a tire having a tread portion 2. A first shoulder land portion 11 of the tread portion 2 includes a plurality of shoulder blocks 20. Each of the plurality of shoulder blocks 20 is provided with a plurality of shoulder sipes 25. A first crown land portion 13 includes a plurality of crown blocks 30. Each of the plurality of crown blocks 30 is provided with a plurality of crown sipes 35. Each of the plurality of crown sipes 35 is closed at at least one end thereof at a tread surface of the crown block 30. A total sum ΣCv of crown circumferential edge components of all the crown sipes 35 formed on one crown block 30 is larger than a total sum ΣSv of shoulder circumferential edge components of all the shoulder sipes 25 formed on one shoulder block 20.

A heavy duty tire 2 includes a tread 4. The tread 4 has a plurality of circumferential main grooves 12. The plurality of circumferential main grooves 12 include a circumferential narrow groove 38. The circumferential narrow groove 38 includes a body portion 30, a tapered portion 32, and a widened portion 34. When the tread 4 comes into contact with a road surface, a pair of wall surfaces 24 of the circumferential narrow groove 38 come into contact with each other at the body portion 30. In a contour line of the circumferential narrow groove 38 in a meridian cross-section of the tire 2, an outer transition portion 40 which is a portion transitioning from the tapered portion 32 to the body portion 30 is represented by an arc tangent to a contour line of the tapered portion 32 and a contour line of the body portion 30, and an inner transition portion 42 which is a portion transitioning from the body portion 30 to the widened portion 34 is represented by an arc tangent to the contour line of the body portion 30 and a contour line of the widened portion 34.

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Provided is a tire (2, 202, 302, 402, 502, 582, 622) that can achieve the improvement in a visual aspect. A tire (2, 202, 302, 402, 502, 582, 622) has an outer diameter smaller than a value obtained by subtracting 4 mm from an outer diameter maximum value of new product dimensions defined by a JATMA standard or an ETRTO standard, and has a total width smaller than a value obtained by subtracting 5 mm from a maximum total width of the new product dimensions. The tire (2, 202, 302, 402, 502, 582, 622) includes an outer surface (2G, 202G, 302G, 402G, 502G, 582G) including a tread surface (24, 220, 324, 424, 524) and a pair of side surfaces (28, 224, 328, 428, 528, 600). The tread surface (24, 220, 324, 424, 524) includes an equator (PC) that is an intersection point with an equatorial plane. Each of the side surfaces (28, 224, 328, 428, 528, 600) includes a maximum width position (PW). In a normal state, a ratio (LSh/LBS) of a length (LSh) of the shoulder line segment to a length (LBS) of the reference line segment is 85.9% or more and 89.3% or less, and a ratio (Rc/Rm) of the radius (Rc) of the center arc to the radius (Rm) of the middle arc is 1.85 or more and 2.00 or less.

A tread portion 2 includes an outer tread end To, an inner tread end Ti, lateral grooves 3, and circumferential grooves 5. Each region between the lateral grooves 3 and between the outer tread end To and the inner tread end Ti forms a block group 10 in which a plurality of blocks are arranged. The block groups 10 include a first block group 11 and a second block group 12. The first block group 11 has a plurality of first circumferential grooves 6. The second block group 12 has a plurality of second circumferential grooves 7. A connection position of each of the plurality of first circumferential grooves 6 to the lateral groove 3 and a connection position of each of the plurality of second circumferential grooves 7 to the lateral groove 3 are different from each other in a length direction of the lateral groove 3.

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