US 9,809,060 B2
Pneumatic tire
Yasutaka Iwata, Hyogo (JP)
Assigned to SUMITOMO RUBBER INDUSTRIES, LTD., Kobe-Shi, Hyogo (JP)
Appl. No. 14/360,397
Filed by SUMITOMO RUBBER INDUSTRIES, LTD., Kobe-shi, Hyogo (JP)
PCT Filed Dec. 17, 2012, PCT No. PCT/JP2012/082654
§ 371(c)(1), (2) Date May 23, 2014,
PCT Pub. No. WO2013/099675, PCT Pub. Date Jul. 4, 2013.
Claims priority of application No. 2011-289681 (JP), filed on Dec. 28, 2011.
Prior Publication US 2014/0326382 A1, Nov. 6, 2014
Int. Cl. B60C 11/03 (2006.01)
CPC B60C 11/0306 (2013.01) [B60C 11/0309 (2013.01); B60C 2011/0346 (2013.01); B60C 2011/0365 (2013.01); B60C 2011/0367 (2013.01); B60C 2011/0372 (2013.01); B60C 2011/0374 (2013.01); B60C 2011/0381 (2013.01); B60C 2011/0388 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A pneumatic tire comprising:
a tread portion provided with
a circumferentially and continuously extending central main groove on a tire equator or on each side of the tire equator,
a pair of circumferentially and continuously extending shoulder main grooves axially outside the central main groove, and
a pair of middle land portions each of which is arranged between the central main groove and the shoulder main groove on each side of the tire equator,
wherein
the central main groove extends in a wavy manner comprising a plurality of repeated arc portions each of which has its center located axially outward thereof to include a plurality of outer projected peak portions that protrude axially outermost,
each of the middle land portions is provided with a plurality of inner middle lateral grooves and a plurality of outer middle lateral grooves,
each of the inner middle lateral grooves comprises a first inclined portion that extends axially outwardly from the central main groove at an angle of from 10 to 40 degrees with respect to a circumferential direction of the tire, a second inclined portion that is inclined at an opposite direction to the first inclined portion so as to extend axially inwardly without reaching the central main groove, and a bent portion connecting the first inclined portion and the second inclined portion, wherein each of the inner middle lateral grooves extends from each of the outer projected peak portions of the central main groove,
each outer middle lateral groove comprises an axially inner end communicated with the inner middle lateral groove, and an axially outer end communicated with the shoulder main groove,
the axially inner end of the outer middle lateral groove communicates with the second inclined portion of the axially inner middle lateral groove without including an axially outermost groove edge of the inner middle lateral groove, and
the axially outer middle lateral groove inclines in the same direction of the first inclined portion of the inner middle lateral groove at an angle of from 30 to 70 degrees with respect to the circumferential direction of the tire.