Abstract: A tire testing apparatus performs the test by rotating a tire while the tire is in contact with a drum. A plurality of sensors are provided on the outer circumferential surface of the drum and are arranged side by side along a widthwise direction of the drum, thereby measuring the ground contact forces at the ground contact position with the tire. A calculation unit obtains, based on the ground contact forces measured by the sensors, a displacement amount Dy of the ground contact position in the widthwise direction and a change amount ?Fy of the ground contact force Fy in the widthwise direction which corresponds to the displacement amount Dy, thereby calculating the lateral stiffness sharing rate Ky rib on the basis of the displacement amount Dy and the change amount ?Fy.

Abstract: A tire testing apparatus of drum type includes a drum having, on a circumferential outer surface thereof, a sensor for measuring a ground contact force of a tire and a transparent portion; an image capturing device for capturing, from inside of the drum and through the transparent portion, an image of the ground contact surface of a tire; a ground contact force measurement processing unit which measures a ground contact force of a tire in planner contact with the sensor; a ground contact surface image capture processing unit which captures an image of the ground contact surface by the image capturing device when the tire comes into planner contact with the transparent portion; and a slip amount calculation unit which calculates a slip amount based on a displacement of a corresponding location which corresponds to a ground contact surface of the tire for which a measurement is made.

Abstract: A tire testing apparatus of a drum type includes: a drum including a transmission portion on an outer circumferential surface; an imaging device that images a ground contact surface of a tire from an inside of the drum via the transmission portion; a ground contact surface imaging processing unit that images, using the imaging device, the ground contact surface when the tire is brought into ground contact with the transmission portion; an edging processing unit that performs edging processing for image information of the imaged ground contact surface of the tire; a division processing unit that performs division processing for the image information subjected to the edging processing into regions which satisfy a predetermined resolution condition; a matching processing unit that performs matching processing by using the divided regions; and a slip amount calculation processing unit that calculates a slip amount and a ground contact surface moving amount.

Abstract: An object is to provide a tire testing apparatus. A tire testing apparatus of a drum type includes: a drum including a transmission portion on an outer circumferential surface; an imaging device that images a ground contact surface of a tire from an inside of the drum via the transmission portion; a ground contact surface imaging processing unit that images, using the imaging device, the ground contact surface when the tire is brought into ground contact with the transmission portion; an edging processing unit that performs edging processing for image information of the imaged ground contact surface of the tire; a division processing unit that performs division processing for the image information subjected to the edging processing into regions which satisfy a predetermined resolution condition; a matching processing unit that performs matching processing by using the divided regions; and a slip amount calculation processing unit that calculates a slip amount and a ground contact surface moving amount.

Abstract: It is to provide a pneumatic safety tire capable of continuing safe running even if an internal tire pressure drops to an atmospheric pressure and easily producing the tire, in which a side reinforcing rubber layer having substantially a crescent form at a section in a widthwise direction is mainly arranged on the sidewall portion and at least one annular depression convexly protruding inward in the radial direction and continuously extending in the circumferential direction is arranged on the belt.

Abstract: A radial pneumatic tire having excellent run-flat durability. The tire is equipped with a belt (4), which includes a plurality of metal cord layers, and a tread (5) successively placed at a periphery of a crown portion (3) of a toroidal radial carcass (2), and is equipped with, at an inner peripheral surface of the side portion (6) of the carcass, a rubber reinforcing layer (7) having a crescent moon shaped cross-section and bearing and supporting load. The tire has an auxiliary belt (8) disposed between the carcass and the belt and including organic fiber cords which are oriented substantially cross to the cords of the carcass and the cords of the belt with respect to a central equatorial plane, the cords of the auxiliary belt substantially crossing the central equatorial plane.

Abstract: A method for the production of an aqueous dispersion of a long-chain alkyl graft polymer, which method comprises mixing an aqueous solution of a polyamine with a long-chain alkyl isocyanate and stirring the resultant mixture thereby causing reaction of said component reactants, and an aqueous release agent formed therefrom.

Abstract: A pneumatic radial tire has a double crown structure that an annular recess portion is arranged in a tread at a given region in a widthwise direction thereof, in which the tread is divided into a central region, a pair of middle regions and a pair of side regions and at least one auxiliary reinforcing cord layer is arranged on a belt so as to substantially envelop a crown portion of a carcass and a full radially outer surface of the belt, provided that a stretching ratio of the cords in the auxiliary reinforcing cord layer in the central region and side regions is equal to or more than that in the middle regions, whereby high-speed durability is improved together with excellent drainage while controlling the increase of tire weight and cost as much as possible.

Abstract: A pneumatic radial tire comprises a tread provided with a plurality of circumferential grooves extending in a circumferential direction of the tire, and plural rows of land portions defined between axially adjacent circumferential grooves and between each of edges of the tread and the adjacent main circumferential groove. That groove wall of at least the circumferential groove located nearest to at least one of the tread edges on a treading surface of the tread which is positioned on a side of the one of the tread edges is inclined to gradually increase a width of the groove toward the surface of the tread from a location spaced by 10-70% of a depth of the circumferential groove radially outwardly from a bottom thereof. The width of an opening of the circumferential groove to the surface of the tread is in a range of 3-18 mm.

Abstract: A pair of radial tires consist of two tires each having a tread comprising annular land portions formed by a plurality of circumferential main grooves extending in the circumferential direction of the tire, and rows of blocks formed by extending transverse main grooves inclinedly in the circumferential direction in at least land portions located at axially opposite side edge portions of the tire. Tread patterns of these two tires are asymmetrical and have directional property. Transverse main grooves of each of the tires, which define the rows of the blocks to be located axially inside, are extended inclinedly downwardly toward the inner side of the tread in the width direction as viewed from the front side of the tire. Each of the transverse main grooves of the tire, which define the row of the blocks located axially on the outer side is extended in an almost inverse V-letter shape as viewed from the front side of the tire.