Title:
PNEUMATIC TIRE
Document Type and Number:
WIPO Patent Application WO/2019/111875
Kind Code:
A1
Abstract:
Provided is a pneumatic tire comprising a side reinforcement layer in a side wall section, wherein the structure of a bead section is improved so as to make it possible to reduce tire weight while maintaining the durability of the tire. The width W0 of a layer with the greatest number of rows among a plurality of layers that make up a bead core 5, the width W1 on the innermost side in the tire radial direction, and the width W2 on the outermost side in the tire radial direction are set so as to fulfill the relationships W1 > W2 and W2 ≤ 0.5 × W0; the layer of the width W0 is positioned more inward in the tire radial direction from the center position of the bead core 5 in the tire radial direction; a carcass layer 4 is folded back while being curved along a peripheral edge of the bead core; a folded-back section 4B of the carcass layer 4 extends toward side wall sections 2 while maintaining contact with a main section 4A of the carcass layer 4; the proportion of rubber in a closed region formed by the main section 4A of the carcass layer 4 and the folded-back section 4B is 0.1–15%; and the cross-sectional area S2 and the hardness H2 of a filler layer 9 disposed on the outer side of the carcass layer 4 in the tire width direction and the cross-sectional area S1 and the hardness H1 of a side reinforcement layer 8 fulfill the relationship 0.12 ≤ (S2 × H2) / (S1 × H1) ≤ 0.50.
Inventors:
TANNO ATSUSHI (JP)
KODA HIRAKU (JP)
MATSUDA JUN (JP)
NAGAYASU MASAAKI (JP)
SASAYA YUKI (JP)
TAKEMORI RYOHEI (JP)
KODA HIRAKU (JP)
MATSUDA JUN (JP)
NAGAYASU MASAAKI (JP)
SASAYA YUKI (JP)
TAKEMORI RYOHEI (JP)
Application Number:
PCT/JP2018/044502
Publication Date:
June 13, 2019
Filing Date:
December 04, 2018
Export Citation:
Assignee:
YOKOHAMA RUBBER CO LTD (JP)
International Classes:
B60C15/06; B60C3/04; B60C13/00; B60C15/00; B60C15/04; B60C17/00
Foreign References:
| JP2001510419A | 2001-07-31 | |||
| JP2002301915A | 2002-10-15 | |||
| JP2008149778A | 2008-07-03 | |||
| JP2015020741A | 2015-02-02 | |||
| JP2015067002A | 2015-04-13 | |||
| JP2000351306A | 2000-12-19 |
Attorney, Agent or Firm:
SEIRYU PATENT PROFESSIONAL CORPORATION et al. (JP)
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