Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Reexamination Certificate
2000-07-28
2003-06-17
Knable, Geoffrey L. (Department: 1733)
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
C152S154100, C156S075000, C156S123000
Reexamination Certificate
active
06579389
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method of improving the high-speed radial force variation of a pneumatic tire and a pneumatic tire having improved high-speed radial force variation.
2. Description of the Related Art
The radial force variation (RFV), radial runout (RRO) weight imbalance of a pneumatic tire are well known factors in tire vibrations during running, and they are mutually related to a high degree. Generally, various standards relating to tire uniformity tests such as the Japanese standard JASO C607-87 refer to the RFV and RRO measured at a relatively slow speed at which the centrifugal force can be disregarded (hereinafter low-speed RFV and low-speed RRO).
Even if such low-speed RFV and low-speed RRO and the weight imbalance at a relatively slow rotational speed are improved, there is still a possibility that vibrations occur during high-speed running over 80 km/h.
SUMMARY OF THE INVENTION
Thus, the inventor studied and found that a chief factor in the tire vibrations is the fundamental wave or harmonic of the RFV during high-speed running (hereinafter high-speed fundamental RFV).
Therefore, a primary object of the present invention is to improve the high-speed RFV of a pneumatic tire without affecting the low-speed RFV and RRO.
According to one aspect of the present invention, a tread portion of a pneumatic tire is provided on the radially inner surface with an elastic patch, the patch having a certain weight and being stuck at a certain circumferential position, the weight and position are determined based on (A) low-speed fundamental RFV or (B) low-speed fundamental RRO or (C) static weight imbalance of the tire, each measured before applying the patch.
REFERENCES:
patent: 2080227 (1937-05-01), Periat et al.
patent: 2245355 (1941-06-01), Mullen
patent: 3725163 (1973-04-01), Hofelt, Jr.
patent: 5915274 (1999-06-01), Douglas
patent: 63-142228 (1988-06-01), None
patent: 7-156293 (1995-06-01), None
Patent Abstracts of Japan, vol. 1995, No. 09, Oct. 31, 1995, Sumitomor Rubber Industries, Ltd. (Abstract Only).
Patent Abstracts of Japan, vol. 012, No. 401 (P-776), Oct. 25, 1988, Bridgestone Corporation (Abstract Only).
Patent Abstracts of Japan, vol. 1999, No. 14, Dec. 22, 1999, Bridgestone Corporation (Abstract Only).
Birch & Stewart Kolasch & Birch, LLP
Knable Geoffrey L.
Sumitomo Rubber Industries Ltd.
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