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Patent Searching and Data


Title:
RADIAL TIRE FOR PASSENGER CARS AND PRODUCTION THEREOF
Document Type and Number:
WIPO Patent Application WO/1988/003094
Kind Code:
A1
Abstract:
This tire is equipped with a carcass (6) made of organic fiber cords arranged in a radial direction and the radius of curvature (RT1) of its tread surface when the tire is fitted to a standard rim (10) and one tenth of a standard inner pressure is applied thereto and the radius of curvature (RT2) of the tread surface when the standard inner pressure is applied satisfy the relation: 1.10 RT2/RT1 1.40. Moreover, the radius of curvature (RC1) at the time of the 10 % pressure and the radius of curvature (RC2) at the time of the standard pressure at the shoulder portion of the carcass satisfy the relation: 0.65 RC2/RC1 0.85. This arrangement improves in a good proportion various performances of the tire such as wear resistance, fuel consumption, and so forth. The method of producing the radial tire for passenger cars in the present invention is characterized in that the inner carcass profile of a vulcanization mold (20) is set so that the maximum width (WA) of the carcass (6A) is set to a value greater than the maximum width (WB) of the carcass (6B) as determined based on a natural equilibrium shape theory while the height (HA) of the position (CA) of the maximum width (WA) of the carcass (6A) is set to a value smaller than the height (HB) of the position (CB) of the maximum width (WB) of the carcass (6B) determined based on the natural equilibrium shape theory. The tire is vulcanized and molded on the basis of this profile.

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Inventors:
Noma
Hiroyuki, Takehara
Kenji, Fujiwara
Kenichi
Application Number:
PCT/JP1987/000805
Publication Date:
May 05, 1988
Filing Date:
October 17, 1987
Export Citation:
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Assignee:
SUMITOMO RUBBER INDUSTRIES, LTD
Noma, Hiroyuki Takehara Kenji Fujiwara Kenichi
International Classes:
B60C3/04; B60C9/28; B60C11/00; (IPC1-7): B60C3/04; B60C9/28; B60C11/00
Foreign References:
JPS61200004A1986-09-04
JPS5424762B21979-08-23
JPS56131403A1981-10-15
JPS577923B21982-02-13
JPS5896927U1983-07-01
Other References:
See also references of EP 0292563A4
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