Sumitomo Rubber Industries Limited

Dunlop Gmbh

Honda Motor Co., Ltd.

Sp Reifenwerke Gmbh

Wako Iwamura

Makoto Sugiya

Manfred Gerresheim

Jurgen Schomburg

Makoto Igarashi

Juergen Schomburg

Shoushuu Yamazaki

Kiyotaka Nishio

Kazuyoshi Shiga

Mutsuki Sugimoto

Kazuo Asano

Mikio Kashiwai

Yuka Yokoyama

Katsumi Terakawa

Nobuo Kambara

Hirotoshi Otsuki

Haruo Fukuta

Seiji Nomura

Yasuhiro Narahara

Hirotoshi Kagota

Shunsuke Uchiyama

Naoki Shirakawa

Hitoshi Takeuchi

Makoto Sugija

Shoshuu Yamazaki

An airless tire comprises: a tread ring having a tread, a hub located radially inside the tread ring, and cross radial members connecting the tread ring with the hub. The cross radial members include first radial members and second radial members crossing the first radial members. The length measured along the radial member is not more than 180% of the radial distance between the hub and the tread ring.

Airless tire

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 airless tire includes a cylindrical tread ring having a ground contact surface, a hub disposed radially inward of the tread ring and a plurality of spokes each connecting the tread ring to the hub. The hub includes a disk portion to be fixed to an axle and a cylindrical portion extending in an axial direction of the tire from a radially outer portion of the disk portion. The cylindrical portion includes a radially inner surface being provided with a circumferentially extending projection protruding radially inwardly.

Airless tire and hub for airless tire

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

An airless tire includes a tread ring, a hub formed on radial direction inner side of the ring to be fixed to an axle, and a spoke structure connecting the ring and hub. The ring includes a tread rubber layer, a first reinforcing cord layer, a second reinforcing cord layer and a shear rubber layer between the first and second cord layers, the first and second cord layers and shear layer are formed such that ratio Eb/Ee between tire circumferential direction tensile modulus Ebof the first cord layer and shear modulus Ee of the shear layer is 100 or greater and ratio Eb/Ee between tire circumferential direction tensile modulus Ebof the second cord layer and shear modulus Ee is 100 or greater, and each cord layer has topping rubber having loss tangent tan &#x3b4;b of 0.03 to 0.10 and tensile modulus E*b of 4 to 20 MPa.

An airless tire includes a tread ring having a cylindrical form and a ground contact surface. The tread ring has multiple through holes and a reinforcing body such that the through holes are penetrating through the tread ring in a thickness direction of the tread ring and formed at intervals along a tire circumferential direction and that the reinforcing body includes a first reinforcing body extending in the tire circumferential direction in regions between adjacent through holes, and the first reinforcing body is formed such that the first reinforcing body has end portions in the tire circumferential direction and that the end portions terminate without being exposed from inner peripheral surfaces of the through holes.

Provided is a non-pneumatic tire having excellent durability performance. This non-pneumatic tire is provided with an annular tread portion which contacts the road surface, an annular inner peripheral portion which is positioned radially inward of the tread portion, and multiple linking units which join the tread portion and the inner peripheral portion. The tread portion includes a first portion which contacts the road surface, and a second portion which includes an inner peripheral surface facing the inner peripheral portion. The thermal conductivity of the second portion is greater than that of the first portion.

Non-pneumatic tire

To provide a rubber compound for tires, a pneumatic tire and an airless tire capable of improving the steering stability of the tire while exerting excellent low fuel consumption performance. A rubber compound for tires characterized in that, of vulcanized rubber's physical properties, a complex elastic modulus E*(unit: MPa) and a loss tangent tan &#x3b4;under initial strain of 10%, dynamic strain of 2% and temperature of 70 degrees C., satisfy 90&#x3c;E*&#x3c;250, and E*/tan &#x3b4;&#x3e;800. A pneumatic tire provided with a rubber member made of the above-mentioned rubber compound. An airless tire provided with a rubber member made of the above-mentioned rubber compound. An airless tire provided in a tread ring with a shear rubber layer made of the above-mentioned rubber compound.

Rubber compound for tires, pneumatic tire, and an airless tire

An airless tire includes a tread ring including an elastic body and having a cylindrical form and a ground contact surface, a hub including a substantially non-extensible material and positioned on a tire radial direction inner side of the tread ring such that the hub is fixed to an axle, and multiple spokes including an elastic material and connecting the tread ring and the hub. Each of the spokes has an outer edge fixed to the tread ring and an inner edge fixed to the hub such that the outer edge and the inner edge are extending obliquely with respect to a tire axial direction, and the spokes are formed such that the outer edge of each of the spokes has compression rigidity Sr which is greater than compression rigidity Sh of the inner edge of each of the spokes.

The purpose of the present invention is to minimize decline in endurance, while improving vibration performance. The spokes of an airless tire are provided, as an integrated unit, with an outside annular portion joined to the inside peripheral surface of a tread ring, an inside annular portion joined to the outside peripheral surface of a hub, and a spoke plate portion of constant thickness providing linkage therebetween. The radial inner edge and the radial outer edge of the center plane of thickness of the spoke plate portion are respectively diagonal with respect to a tire axial-direction line. The intersection line at which the center plane of thickness intersects a plane that is at a right angle to the tire axial-direction line constitutes a straight line. The spoke length, which is the length from the radial inner edge to the radial outer edge along the intersection line, is constant for any given location in the tire axial direction.

An air-less tire has, formed on a tread ring: tread rubber for forming a ground contact surface; an outer reinforcement cord layer provided nearest the tread rubber; an inner reinforcement cord layer provided inside the outer reinforcement cord layer in the radial direction of the tire; and a shear rubber layer provided between the outer reinforcement cord layer and the inner reinforcement cord layer. The outer reinforcement cord layer includes: a first cord layer having first cords arranged tilted relative to the circumferential direction of the tire; and a second cord layer provided outside the first cord layer in the radial direction of the tire and having second cords arranged tilted relative to the circumferential direction of the tire in the direction opposite the direction in which the first cords are tilted. The inner reinforcement cord layer includes a third cord layer having third cords arranged parallel to the circumferential direction or the axial direction of the tire.

Air-less tire

An airless tire has a cylindrical tread ringhaving a ground-contacting surface, a hub disposed on the radially inside of the tread ringand fixed to an wheel shaft, and spokes connecting between the tread ringand the hub. The tread ringhas a side wallcontinued from the ground-contacting surfaceand forming a ring side surface. The side wallhas a supporting portionwhich, when the tread ringalone is horizontally laid on a horizontal surface H, contacts with a horizontal surface H and supports the tread ringso that a ring axis Ais oriented in a direction perpendicular to the horizontal surface H.

Airless tire and method of manufacturing same

An airless tire includes a tread ring, a hub positioned on radially inner side of the ring, and a spoke structure including polymer material and connecting the ring and hub, the structure including spoke pieces arrayed in circumferential direction. Each spoke piece has a tread connecting portion, a hub connecting portion, and a spoke curved portion between the tread and hub connecting portions, each spoke piece has straight radial length LSb of at least 1.05 times straight radial length LSa and curved radial length LLb of at least 1.03 times LSb when positioned at 0&#xb0; on coordinate around the tire axis where a perpendicular line extending vertically upward from the tire axis is set 0&#xb0;, LSb is measured along the base line under base-load condition, LSa is measured along the base line under no-load condition, and LLb is measured along a curve of each spoke piece under the base-load condition.

A non-pneumatic tire includes a tread ring having an annular form, a hub positioned on a tire radial direction inner side of the tread ring, and multiple spokes connecting the tread ring and the hub. The tread ring has one or more grooves formed on a ground contact surface such that the groove includes a widened portion having an enlarged groove width and a hole penetrating through the tread ring and formed in the widened portion.

An airless tire includes a tread ring having a cylindrical form and a ground contact surface, a hub positioned on radial direction inner side of the tread ring and formed to be fixed to an axle, and a spoke structure connecting the tread ring and hub. The tread ring includes a tread rubber layer forming the ground contact surface, and a reinforcing rubber layer formed on tire radial direction inner side of the tread layer, and the reinforcing layer is formed of a rubber material obtained by co-crosslinking a rubber composition including a rubber component, an &#x3b1;, &#x3b2;-unsaturated carboxylic acid metal salt and a peroxide such that the metal salt has amount in range of 10 to 80 parts by weight with respect to 100 parts by mass of the rubber component and the rubber component has content rate of butadiene rubber in range of 10 to 100% by mass.

Growing community of inventors

Kobe, Japan

Wako Iwamura