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Title:
PNEUMATIC SAFETY TIRE
Document Type and Number:
Japanese Patent JP2006199190
Kind Code:
A
Abstract:

To provide a pneumatic safety tire which is lightweight compared to the conventional side reinforcing type safety tire, and where heat generation of the side reinforcing rubber layer is small and run-flat traveling performance is largely improved while maintaining normal traveling performance (rolling resistance, and drivability or the like) in filling internal pressure at high level.

The pneumatic safety tire is equipped with a pair of side reinforcing rubber layers 6 having crescent shaped cross section disposed inside of a carcass 4 of a side wall part 2. The rubber composition compounded with polyketone short fibers satisfying the following formulas with respect to a rubber component is used for the side reinforcing rubber layer 6. σ≥-0.01×E+1.2 and σ≥0.02 [wherein σ is a thermal contraction stress (cN/dtex) at 177°C, and E is an elasticity modulus (cN/dtex) in loading of 49N at 25°C].


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Inventors:
ISHIZAKI SUSUMU
YAMAMOTO MASAHIKO
Application Number:
JP2005000014317
Publication Date:
August 03, 2006
Filing Date:
January 21, 2005
Export Citation:
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Assignee:
BRIDGESTONE CORP
International Classes:
B60C17/00; B60C1/00; B60C9/00
Domestic Patent References:
JP2004218189A2004-08-05
JPH0931247A1997-02-04
JPH11278019A1999-10-12
JP2003013326A2003-01-15
JP2003027333A2003-01-29
JPH11348512A1999-12-21
Foreign References:
WO2002068738A12002-09-06
Attorney, Agent or Firm:
Sugimura Kosaku
Tokunaga Hiroshi
Yoshiyuki Iwasa
Shiro Fujitani
Kimura Kiyoshi
Kazuyuki Tomita