Title:
PNEUMATIC RADIAL TIRE FOR SMALL PASSENGER CAR
Document Type and Number:
Japanese Patent JP3212483
Kind Code:
B2
Abstract:
PURPOSE: To provide a pneumatic radial tire for a small passenger car which does not deteriorate the breaking strength of the tire and has an improved driving stability.
CONSTITUTION: This pneumatic radial tire for a small passenger car is not more than 13 inches in size and its bead core of a bead portion comprises a mono-strand formed by helically winding and binding the wires of a circular section covered with rubber. The lap length L (mm) of the start of winding and the end of winding satisfies the relationship expressed by the equation L≥4.0×10×πr2 (f/A) (where r is a radius of the wire, f is tensile strength of the wire (kgf/mm2) and A is pulling force of the wire from covered rubber (kgf)) and the sectional shape of the bead core forms a regular hexagon with a fine structure comrising 7 wires along the circumference of not less than 80% of the whole circumference and the wire is 1.25-1.55mm in diameter (D).
Inventors:
Masahiko Yamamoto
Application Number:
JP12303595A
Publication Date:
September 25, 2001
Filing Date:
April 25, 1995
Export Citation:
Assignee:
Bridgestone Corporation
International Classes:
D07B1/06; B60C9/08; B60C15/04; B60C15/05; (IPC1-7): B60C15/04
Domestic Patent References:
| JP2286407A | ||||
| JP8118924A | ||||
| JP5563205U | ||||
| JP6188804U | ||||
| JP62195504U |
Attorney, Agent or Firm:
Ichiro Honda