| 摘要 |
PROBLEM TO BE SOLVED: To provide a pneumatic tire improving steering safety at the time of straight ahead traveling on snow and cornering by optimizing a wall surface shape of a wavy sipe. SOLUTION: The tire 1 has a land part 6 arranged with the sipe 5 extending in a generally tire width direction in a shoulder area 4 when a tread portion 2 is sectioned into a center area 3 and the shoulder area 4. The sipe 5 has a wavelike extending shape alternately coupling a crest portion 7 and a trough portion 8 to keep a fixed wavelength. In the sipe 5 arranged on the land part 6, anglesθ1 toθ7 made by a line segment connecting the maximum displacement points 10, 14 of the crest portion 7 on a tread surface 9 and a sipe bottom 12, a line segment connecting the maximum displacement points 11, 16 of the trough portion 8, and a normal raised on the tread are gradually increased from the inside to the outside in the tire width direction. The wall surface shape of the sipe 5 over full length is formed to gradually widen from the sipe bottom position toward an opening position of the tread surface 9. COPYRIGHT: (C)2006,JPO&NCIPI
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