US 11,718,130 B2
Pneumatic tire
Yousuke Sakamoto, Hiratsuka (JP)
Assigned to The Yokohama Rubber Co., Ltd., Tokyo (JP)
Appl. No. 16/964,583
Filed by The Yokohama Rubber Co., LTD., Tokyo (JP)
PCT Filed Dec. 27, 2018, PCT No. PCT/JP2018/048197
§ 371(c)(1), (2) Date Jul. 23, 2020,
PCT Pub. No. WO2019/146370, PCT Pub. Date Aug. 1, 2019.
Claims priority of application No. 2018-008851 (JP), filed on Jan. 23, 2018.
Prior Publication US 2020/0361246 A1, Nov. 19, 2020
Int. Cl. B60C 11/11 (2006.01); B60C 11/12 (2006.01); B60C 11/13 (2006.01); B60C 11/03 (2006.01)
CPC B60C 11/1236 (2013.01) [B60C 11/033 (2013.01); B60C 11/11 (2013.01); B60C 11/1204 (2013.01); B60C 11/1281 (2013.01); B60C 11/1353 (2013.01); B60C 2011/0346 (2013.01); B60C 2011/0362 (2013.01); B60C 2011/0383 (2013.01); B60C 2011/1361 (2013.01); B60C 2200/14 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A pneumatic tire, comprising:
a tread portion having an annular shape extending in a tire circumferential direction;
a pair of sidewall portions disposed on both sides of the tread portion; and
a pair of bead portions disposed inward of the pair of sidewall portions in a tire radial direction, wherein
the tread portion comprises:
a pair of main grooves extending in a zigzag shape along the tire circumferential direction on both sides of a tire equator; and
a center land portion defined between the pair of main grooves on the tire equator,
the center land portion is defined into a plurality of repeating units by a pair of first shallow grooves that extend along a tire lateral direction, have both ends communicating with portions other than bent portions of the pair of main grooves, and are disposed at an interval in the tire circumferential direction,
each repeating unit is an aggregate formed of four blocks defined by a pair of second shallow grooves extending from the main grooves in the tire lateral direction and converging toward one point on the tire equator, a third shallow groove extending from one of the pair of first shallow grooves, which is adjacent to the repeating unit, to one of the pair of second shallow grooves, and a fourth shallow groove extending from the other of the pair of first shallow grooves, which is adjacent to the repeating unit, to the other of the pair of second shallow grooves,
a sipe is formed in each of the four blocks,
the sipe comprises a straight portion and a bent portion, the straight portion extending toward a position at which the pair of second shallow grooves converge and communicating with any one of the second shallow groove, the third shallow groove or the fourth shallow groove, the bent portion extending while being bent in the same direction with respect to the straight portion,
a narrow groove is formed in each of the four blocks, and
the narrow groove has one end communicating with a main groove and the other end joined to an end of the sipe.