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公开(公告)号：US20240393213A1
公开(公告)日：2024-11-28
申请号：US18663155
申请日：2024-05-14
Applicant: Sumitomo Rubber Industries, Ltd.
Inventor： Yuki HARADA , Yoshiki KANAYA , Hiroki SARASHI , Eiji YOSHIOKA
Abstract: A prediction method includes: measuring an actual shape of a rolling reference tire; acquiring a displacement profile as a change in the actual shape due to rolling; calculating displacement amounts of order components of first to Nth orders (N is an integer of 2 or more) in the displacement profile through fast Fourier transform; obtaining, as a quantitative index value, a reciprocal of a sum of displacement amounts of order components reflecting a change in the actual shape due to a sign of the standing wave phenomenon, and acquiring a correlation between a performance index value representing durability of the reference tire and the quantitative index value; and simulating rolling of the reference tire to estimate a virtual quantitative index value corresponding to the quantitative index value, and acquiring a correlation between the virtual quantitative index value and the quantitative index value.
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公开(公告)号：US20190143760A1
公开(公告)日：2019-05-16
申请号：US16169658
申请日：2018-10-24
Applicant: Sumitomo Rubber Industries, Ltd.
Inventor： Yoshiki KANAYA
Abstract: A heavy-duty pneumatic tire includes a section width being equal to or less than 335 mm, an aspect ratio being equal to or less than 55%, and a toroidal carcass extending between axially spaced bead portions through a tread portion and sidewall portions, wherein the carcass includes a carcass ply which includes a main portion and a turn-up portion, a belt layer disposed radially outward of the carcass in the tread portion, a sidewall rubber defining an outer sidewall profile of each sidewall portion, and a chafer rubber defining an outer bead profile of each bead portion, wherein in each bead portion, on a straight line that is perpendicular to the main portion of the carcass ply and passes a radially inner end of the sidewall rubber, the chafer rubber has a thickness of from 40% to 60% of a thickness of the bead portion.
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公开(公告)号：US20190143752A1
公开(公告)日：2019-05-16
申请号：US16176376
申请日：2018-10-31
Applicant: Sumitomo Rubber Industries, Ltd.
Inventor： Yoshiki KANAYA , Yoshiyuki TAKADA , Mitsuharu KOYA
Abstract: A heavy-duty pneumatic tire includes a section width being equal to or less than 335 mm, an aspect ratio being equal to or less than 55%, and a toroidal carcass extending between axially spaced bead portions through a tread portion and sidewall portions. The carcass includes a carcass ply which includes a main portion and a turn-up portion turned up around a bead core of each bead portion. A belt layer is disposed radially outward of the carcass in the tread portion, wherein a radially outer end of the turn-up portion is located between the main portion and the belt layer in the tread portion. A sheeted rubber layer is disposed between the main portion and the turn-up portions in each sidewall portion.
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公开(公告)号：US20170334249A1
公开(公告)日：2017-11-23
申请号：US15595090
申请日：2017-05-15
Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
Inventor： Yoshiki KANAYA , Ikuo Atake , Shuji Kagimoto
Abstract: A heavy-duty tire includes a tread part formed such that the tread part includes a crown profile including tire equator, and a pair of shoulder profiles extending from outer sides of the crown profile to tread edges. In a tire cross section including tire rotation axis in 5% internal pressure state in which the tire is mounted to a normal rim, filled with air at internal pressure of 5% of normal internal pressure and loaded with no load, each of the crown and shoulder profiles has an arc shape convex toward tire radial direction outer side such that ratio Rc/Rs of curvature radius Re of the crown profile to curvature radius Rs of each shoulder profile is 7.0 or more, and a tire axial direction distance from the equator to a connecting point between the crown profile and each shoulder profile is 0.70 or more times a tread half width.
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