Pneumatic tire
A pneumatic tire includes a plurality of main grooves and a land portion defined by the main grooves. Further, the main groove includes a rib-shaped protrusion portion protruding from a groove bottom of the main groove and extending in a tire width direction, and being coupled to a groove wall of the main groove at, at least, one end. Further, a maximum height H 1 of the protrusion portion has a relationship 0.01≤H 1 /Hg≤0.20 with respect to a groove depth Hg of the main groove. Further, the maximum height H 1 of the protrusion portion is in a range H 1 ≤1.6 mm.
1. A pneumatic tire comprising:
a plurality of main grooves; and
a land portion defined by the main grooves;
each of the main grooves comprising a protrusion portion that protrudes from a groove bottom of the main groove and extends in a tire width direction, and that is coupled to a groove wall of the main groove at at least one end, the protrusion portion having a rib shape,
a maximum height H 1 of the protrusion portion having a relationship 0.01≤H 1 /Hg≤0.20 with respect to a groove depth Hg of the main groove,
an extension length L 1 of the protrusion portion in the tire width direction having a relationship 0.10≤W 1 /L 1 ≤0.40 with respect to a maximum width W 1 of the protrusion portion,
the protrusion portion being coupled to the groove wall of the main groove at one end and terminating in the main groove at an other end, and
in a tread plan view, an extension length L 1 ′ of the protrusion portion in a groove width direction of the main groove having a relationship 0.50≤L 1 ′/Wg≤0.90 with respect to a groove width Wg of the main groove at a position where the protrusion portion is arranged.
2. The pneumatic tire according to claim 1 , wherein the maximum height H 1 of the protrusion portion is in a range H 1 ≤1.6 mm.
3. The pneumatic tire according to claim 1 , wherein the protrusion portion comprises a plurality of protrusion portions and a maximum width W 1 of each of the protrusion portions has a relationship 0.10≤W 1 /P 1 ≤0.60 with respect to a pitch length P 1 of the protrusion portions at the groove wall to which the protrusion portions are coupled.
4. The pneumatic tire according to claim 1 , wherein an inclination angle θ of the protrusion portion with respect to a tire circumferential direction is in a range 30 degrees ≤θ1≤150 degrees.
5. The pneumatic tire according to claim 1 , wherein the protrusion portion comprises a plurality of protrusion portions and a distance D 1 between adjacent protrusion portions has a relationship 0.10≤D 1 /Wg≤0.60 with respect to a groove width Wg of the main groove.
6. The pneumatic tire according to claim 1 , wherein the protrusion portion comprises a plurality of protrusion portions and a distance D 1 of adjacent protrusion portions has a relationship 1.00≤D 1 /W 1 with respect to a maximum width W 1 of an individual one of the protrusion portions.
7. The pneumatic tire according to claim 1 , wherein a maximum width W 1 ′ of the protrusion portion in a tire circumferential direction has a relationship 2.00≤W 1 ′/H 1 with respect to the maximum height H 1 of the protrusion portion.
8. The pneumatic tire according to claim 1 , wherein a rising angle α of a side surface of the protrusion portion on a tire circumferential direction side is in a range 90 degrees ≤α≤110 degrees.
9. The pneumatic tire according to claim 1 , wherein an inclination angle of the main groove with respect to a tire circumferential direction is in a range of 25 degrees or more and 70 degrees or less.
10. The pneumatic tire according to claim 1 , wherein
the land portion comprises a plurality of blocks including a plurality of the protrusion portion, and
an extension length L 1 _ e of a protrusion portion arranged at a circumferential end portion of the block is longer than an extension length L 1 _ c of a protrusion portion arranged in a circumferential central region of the blocks.
11. The pneumatic tire according to claim 1 , wherein
the protrusion portion is coupled to the groove wall of the main groove at one end and terminates in the main groove at an other end, and
a height of the protrusion portion gradually decreases from the groove wall of the main groove toward a terminating end portion of the protrusion portion.
12. A pneumatic tire comprising:
a plurality of main grooves; and
a land portion defined by the main grooves;
each of the main grooves comprising a protrusion portions that protrude from a groove bottom of the main groove and extend in a tire width direction, and that are coupled to a groove wall of the main groove at at least one end, the protrusion portions having a rib shape,
a maximum height H 1 of each of the protrusion portions having a relationship 0.01≤H 1 /Hg≤0.20 with respect to a groove depth Hg of the main groove,
a maximum width W 1 of the protrusion portions having a relationship 0.10≤W 1 /P 1 ≤0.60 with respect to a pitch length P 1 of the protrusion portions at the groove wall to which the protrusion portions are coupled,
the protrusion portions being coupled to the groove wall of the main groove at one end and terminating in the main groove at an other end, and
an inclination angle θ of the protrusion portion with respect to a tire circumferential direction being in a range 65 degrees ≤θ1≤115 degrees.
13. A pneumatic tire comprising:
a plurality of main grooves; and
a land portion defined by the main grooves;
each of the main grooves comprising protrusion portions that protrude from a groove bottom of the main groove and extend in a tire width direction, and that are coupled to a groove wall of the main groove at at least one end, the protrusion portions having a rib shape,
a maximum height H 1 of the protrusion portions having a relationship 0.01≤H 1 /Hg≤0.09 with respect to a groove depth Hg of the main groove,
the maximum height H 1 of the protrusion portions being in a range H 1 ≤1.6 mm,
a distance D 1 of adjacent protrusion portions having a relationship 1.00≤D 1 /W 1 with respect to a maximum width W 1 of the protrusion portions, and
a distance D 1 between adjacent protrusion portions having a relationship 0.10≤D 1 /Wg≤0.60 with respect to a groove width Wg of the main groove.