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Patent
Sumitomo Rubber Industries Ltd. | Date: 2015-08-11

A method for manufacturing a pneumatic tire includes helically winding a first rubber strip including first composition on outer side of a rigid core in circumferential direction of the core such that a first rubber layer including the first strip is formed to have first overlapped portions overlapping side edges of the first strip in helical pattern, and helically winding a second rubber strip including second composition on external surface of the first layer in the same winding direction as the first strip such that a second rubber layer including the second strip is formed to have second overlapped portions overlapping side edges of the second strip in helical pattern. The core has external surface shaped to form inner cavity of a pneumatic tire, and the winding of the second strip includes winding the second strip such that each second overlapped portion is formed between adjacent first overlapped portions.


Patent
Sumitomo Rubber Industries Ltd. | Date: 2015-08-14

An unvulcanized tire includes an inner member including a rubber composition. The composition includes rubber component, carbon black and sulfide compound. The rubber component includes isoprene-based rubber, the sulfide compound of formula (I), where R


Patent
Sumitomo Rubber Industries Ltd. | Date: 2015-08-10

A pinch valve tube includes a fluororubber tube, the entirety of which is formed integrally of fluororubber and having an internal cavity arranged as a flow passage for a fluid, and a crosslink density of the fluororubber forming an inner surface of the flow passage is made higher than an average crosslink density of the entirety.


Patent
Sumitomo Rubber Industries Ltd. | Date: 2015-08-27

The present invention provides a tire having improved wet grip performance and improved breaking properties while ensuring fuel economy. The present invention relates to a tire including a tire component formed of a vulcanized rubber composition obtained by vulcanizing a specific unvulcanized rubber composition.


Patent
Sumitomo Rubber Industries Ltd. | Date: 2015-09-14

A pneumatic tire includes a tread having crown grooves, shoulder grooves, middle lands, and shoulder lands. Each middle land has middle blocks and middle inclined lateral grooves such that the middle inclined lateral grooves are inclining relative to tire axial direction and connecting a crown groove and a shoulder groove, each shoulder land has shoulder blocks and shoulder inclined lateral grooves such that the shoulder inclined lateral grooves are inclining relative to the axial direction and connecting a shoulder groove and a tread edge, and each middle inclined lateral groove is positioned adjacent to a shoulder block such that each middle inclined lateral groove and the shoulder block are sandwiching the shoulder groove and overlapping in tire circumferential direction and have a ratio Lov/Lmg ranging from 0.7 to 1.0, where Lov represents tire circumferential overlapping length Lov, and Lmg represents tire circumferential length Lmg of the middle inclined lateral grooves.

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