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Patent Searching and Data


Title:
SPARE TIRE
Document Type and Number:
Japanese Patent JP2001080317
Kind Code:
A
Abstract:

To provide a spare tire which can prevent inferior manufacturing from occurring and implement reduction in weight and cost.

When an interval between one bead heel and the other bead heel of a spare tire 10 in a free state is defined as A, and rim width of the spare tire 10 is defined as B, a relation between A and B is 1.1<A/B<1.3, and structure of a head core 12 is a mono-strand bead. Accordingly, curvature radius of a side portion of mold constituting a tire side portion is made to be larger to improve flow of rubber in the tire side portion at a time of vulcanization, resulting in largely reducing inferior manufacture. It is not necessary that a side tread gauge should be formed to be thicker, so that an original goal of reduction in weight and cost is archived. Since a bead core 12 is mono- strand type with high rigidity of a wire bundle, adhesion of bead portion 24 and a rim 32 is improved and bead unseating can be secured as before.


Inventors:
OGAWA FUMIO
Application Number:
JP26329099A
Publication Date:
March 27, 2001
Filing Date:
September 17, 1999
Export Citation:
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Assignee:
BRIDGESTONE CORP
International Classes:
B60C3/00; B60C9/08; B60C15/04; (IPC1-7): B60C15/04; B60C3/00; B60C9/08
Attorney, Agent or Firm:
Atsushi Nakajima (3 outside)