Boots – shoes – and leggings
Patent
1994-09-16
1998-01-20
Louis-Jacques, Jacques
Boots, shoes, and leggings
364578, 364570, 152450, 152454, G06F 1500, B60C 304
Patent
active
057107181
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/JP94/00110 filed Jan. 27, 1994.
TECHNICAL FIELD
The present invention relates to a method of designing a pneumatic tire, and more particularly to a method of designing a pneumatic tire which makes it possible to efficiently and easily design and develop the structure, shape and the like of a tire for attaining the single-purpose performance, mutually incompatible performances and the like of the tire, as well as to determine the best structure and shape of the tire and design a tire having high cost performance.
BACKGROUND ART
Conventional methods of designing a tire have been based on experiential rules obtained through repeated numerical experiments using experiments and computers. For this reason, the number of trial manufactures and tests required for development has been enormously large, resulting in increased development cost and making it impossible to readily reduce a development period.
(1) Background Art Concerning the Design of a Tire Carcass Configuration
In general, methods of designing a tire carcass configuration are broadly classified into the following two design methods. Presently most tires are designed, developed, and marketed in accordance with either one of the two methods.
One method of designing a tire carcass configuration is called a natural equilibrated configuration design method, in which the cross-sectional shape of a carcass (a cross-sectional shape of a tire cut in a plane including the rotational axis of the tire) is determined in such a manner that tension in tire carcass cords becomes constant particularly when the tire is fitted onto a rim and is inflated with air so as to bring the internal pressure of the tire to a standard level of internal pressure. Namely, the cross-sectional shape of the carcass at a time when the tire is vulcanized and cured in a mold is made substantially identical to the cross-sectional shape of the carcass which is under the standard internal pressure, so as to prevent the occurrence of a failure due to internal strains or the like occurring locally between laminates or in laminated layers of various reinforcing layers of the tire when the tire is inflated with air.
The other method is called a non-natural equilibrated configuration design method. As a typical method of designing a non-natural equilibrated configuration, a designing method is known which has already been marketed under a trade mark called "R COT" proposed earlier by the present applicant and has been commercially successful. Unlike the above-mentioned method of designing a natural equilibrated configuration, this method of designing a non-natural equilibrated configuration is a designing method which, conversely, controls the tension of the carcass. By making use of the force which tends to shift to a balanced shape owing to inflation with air, the tension is locally controlled so as to obtain a predetermined performance.
(2) Background Art Concerning the Design of the Configuration of a Tire Crown Portion
The configuration of the tire crown portion is designed by a number of circular arcs in a cross section including the rotational axis of the tire. Conventional methods of determining values of the circular arcs include, among others, (1) a method of determining the same on the basis of the values of the circular arcs and a data base on tire performance; (2) a method wherein a number of molds are fabricated, and the determination is made from data on the trial manufacture and evaluation of a tire fabricated by the molds; and (3) a method wherein the determination is made by conducting numerical experiments a large number of times.
(3) Background Art Concerning the Design of a Belt Structure
The belt structure is determined by the belt width, the belt angle, the type of cord, the placement density, and the gauge distribution of the inter-belt rubber. Methods of designing a belt structure include, among others, (1) a method wherein the strain at a belt end is measured through experiments and numerical experiments; (2) a method wherein the
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Abe Akihiko
Kamegawa Tatsuhiko
Nakajima Yukio
Bridgestone Corporation
Louis-Jacques Jacques
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