Title:
PNEUMATIC TIRE
Document Type and Number:
Japanese Patent JP3349224
Kind Code:
B2
Abstract:
PURPOSE: To reduce a tire weight and increase a bead durability by forming a bead apex with a base part and a separation prevention layer made of rubbers with specified heights, JIS hardnesses A, and complex moduli of elasticity E*, respectively.
CONSTITUTION: A bead apex 8 positioned between a main body 9A and curl part 9B of an inner carcuss play 9 is formed with a base part 12 of hard rubber and a separation prevention layer 13 of soft rubber. The base part 12 is so formed that a height HA from a bead base line L is 0.25 to 0.50 times the tire section height H, JIS hardness is 70 to 90°, and complex modulus of elasticity E* is 250 to 320kgf/cm2. Also the separation prevention layer 13 is so formed that, a height HB from the bead base line L is larger than the flange height HF of a rim R, thickness T is 0.5 to 1.5mm, JIS hardness A is 50 to 60°, and complex modulus of elasticity E* is 35 to 50kgf/cm2. Thus a tire weight can be reduced, and occurrence of loose between the carcuss and bead apex can be prevented to increase the durability of bead.
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Inventors:
Naoki Horiba
Application Number:
JP28166593A
Publication Date:
November 20, 2002
Filing Date:
October 14, 1993
Export Citation:
Assignee:
Sumitomo Rubber Industries, Ltd.
International Classes:
B60C15/06; B60C15/00; (IPC1-7): B60C15/06; B60C15/00
Domestic Patent References:
| JP3235703A | ||||
| JP3268932A | ||||
| JP63101102A |
Attorney, Agent or Firm:
Tadashi Naemura