US 11,807,044 B2
Motorcycle tire for rough terrain
Masahiro Hikita, Kobe (JP)
Assigned to SUMITOMO RUBBER INDUSTRIES, LTD., Kobe (JP)
Filed by Sumitomo Rubber Industries, Ltd., Kobe (JP)
Filed on Feb. 2, 2021, as Appl. No. 17/165,497.
Claims priority of application No. 2020-053036 (JP), filed on Mar. 24, 2020.
Prior Publication US 2021/0300124 A1, Sep. 30, 2021
Int. Cl. B60C 11/11 (2006.01); B60C 11/13 (2006.01); B60C 11/03 (2006.01)
CPC B60C 11/11 (2013.01) [B60C 11/0302 (2013.01); B60C 11/1369 (2013.01); B60C 2011/1338 (2013.01); B60C 2200/10 (2013.01); B60C 2200/14 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A motorcycle tire for running on rough terrain comprising a tread portion, wherein
the tread portion includes a base surface and a plurality of blocks protruding outward in a tire radial direction from the base surface,
the blocks include a crown block arranged on a tire equator side and a shoulder block arranged on a tread edge side,
a height (hs) of the shoulder block from the base surface is larger than a height (hc) of the crown block from the base surface,
the shoulder block is provided on the base surface side with a base portion that has a locally increased cross-section taken along the base surface,
the base portion has a stepwise contour in a lateral cross section taken perpendicular to the base surface,
the stepwise contour at least includes a first surface, a second surface, and a third surface,
the first surface extends radially inward from an edge of a ground contacting surface of the shoulder block,
the second surface is connected with a radially inner end of the first surface and extends therefrom along the base surface,
the third surface is connected with a farther end of the second surface from the first surface and extends radially inward therefrom,
the blocks include a middle block arranged between the crown block and the shoulder block,
the tread portion includes a shoulder tie bar formed by a raised base surface and connecting the shoulder block with the middle block, and
a height of the shoulder tie bar is smaller than a height of the base portion.