Sumitomo Rubber Industries Limited

Makoto Igarashi

Wako Iwamura

Makoto Sugiya

Kiyotaka Nishio

Kazuya Suzuki

Hiroyuki Onimatsu

Minoru Nishi

Taro Okabe

Masakazu Washizuka

Kaoru Kubota

A device for manufacturing a multiple layer rubber strip including a first rubber strip and a second rubber strip, the device includes a first rubber extruder for extruding the first rubber strip, a second rubber extruder for extruding the second rubber strip, a first conveyor for conveying the first rubber strip extruded from the first extruder to a downstream side in a convey direction, and a second conveyor for conveying the second rubber strip extruded from the second extruder to a downstream side in the convey direction. The second conveyor is located upwardly of the first conveyor and has a downstream conveyor end which positions above a conveying surface of the first conveyor such that the second rubber strip delivered from the downstream conveyor end meets and overlaps the first rubber strip on the first conveyor at a joining location to form the single multiple layer rubber strip.

Device and method for manufacturing multiple layer rubber strip

A method of manufacturing a tire product comprising: a step of preparing a core-assemblyof a rigid coreand a rubber memberformed on the rigid core, wherein the rigid coreis attached to a spindle device, and the rubber memberis to be vulcanization-molded, and constitutes all or a portion of a green tire, a step of conveying the core-assemblyfrom the spindle deviceinto a mold, and a step of vulcanization-molding the rubber memberon the rigid corein the mold. The conveying of the core-assembly includes obtaining the weight of the rubber memberincluded in the core-assembly

Method of manufacturing tire product

An apparatusfor measuring a diametrical stiffness of a tread ringfor an airless tirecomprises: a devicefor supporting the tread ring, a devicefor applying a constant load F to the supported tread ring across the diameter of the tread ring, and a devicefor measuring the amount of deflection of the tread ring across the above-said diameter caused by the applied load F.

Apparatus and method for measuring diametrical stiffness of tread ring

The present disclosure relates to a heavy-duty tire compatible with wear resistance, uneven wear resistance, and wet performance. In the present disclosure, by providing, to a tread section, a pair of center primary grooves, a pair of shoulder primary grooves, a plurality of center lateral grooves, a plurality of middle lateral grooves, and a plurality of shoulder lateral grooves, the tread section is divided into a center block, a middle block, and a shoulder block.

Heavy-duty tire

A heavy duty pneumatic tire includes a tread portion provided with circumferentially extending zigzag shaped main grooves, a plurality of land portions separated by the main grooves, and a plurality of lateral grooves to form a plurality of block elements on each land portion. Each land portion comprises a number of pitches in a range of from 40 to 50, wherein each pitch consists of one block element and one lateral groove adjacent to the concerned block element. Each block element has a length in a range of from 85% to 95% of a length of the pitch. The main grooves include a crown main groove, a shoulder main groove, and a middle main groove. The middle main groove has a zigzag amplitude larger than those of the crown main groove and the shoulder main groove.

Growing community of inventors

Kobe, Japan

Makoto Igarashi