The Yokohama Rubber Co., Ltd.

Sony Corporation

Saturn Licensing LLC

Hiroshi Iizuka

Yukio Tozawa

Hidekazu Kikuchi

Nobuo Suzuki

Takayuki Suzuki

Kazuhiro Shimura

Takayuki Mogi

Hirokatsu Maruyama

Yoshihisa Inoue

Atsuhiro Naka

In a tire, an inclination angle of a cord included in a second belt layer with respect to a tire width direction is defined as a positive inclination angle in a tire see-through plan view, an intersection point between a perpendicular line drawn from an end portion of a belt layer having a maximum belt width in the tire width direction to a carcass and a cord of an outermost carcass layer in a tire radial direction is defined as a first reference point in a tire meridian cross-sectional view, and an inclination angle of the cord with respect to the tire width direction at the first reference point is −3° or more in the tire see-through plan view.

Tire

An air pressure management device includes: a temperature conversion air pressure calculation unit that calculates a temperature conversion air pressure based on acquired temperature and air pressure of a tire; an air pressure decrease rate calculation unit that calculates an air pressure decrease rate from a change in the temperature conversion air pressure for a predetermined period, the rate indicating a declining trend of the air pressure; an air pressure decrease rate threshold value setting unit that sets an air pressure decrease rate threshold value corresponding to an acquired thermal history amount using a threshold value table, the threshold value table specifying the air pressure decrease rate threshold value associated with the thermal history amount regarding the tire; and a first determination unit that determines whether the air pressure is abnormal based on the calculated air pressure decrease rate and the set air pressure decrease rate threshold value.

Air pressure management device, air pressure management method, and air pressure management program

Provided are a tire casing life management system and a tire casing life management method. A casing life management system includes a temperature sensor that measures the temperature of a tire, a heat history amount calculation unit that calculates a heat history amount received by the tire during a first period, on the basis of a plurality of pieces of temperature information of the tire measured during the first period of at least one day, an accumulation heat amount estimation unit that estimates an accumulation heat amount which can be received by the tire during the second period set for one year, on the basis of the heat history amount in the first period, and a casing life prediction unit that predicts the remaining life period of the casing from the accumulation heat amount in the second period and a predetermined threshold.

Tire casing life management system and tire casing life management method

A tire failure prediction system includes first and second temperature sensors to detect temperatures of first and second tires mounted on a traveling vehicle, a temperature acquisition unit to acquire the temperatures detected by the first and second temperature sensors, and a determination unit to determine, based on the temperatures acquired, a possibility of failure for the first and second tires. The vehicle includes axles on which the tires are mounted. The first and second tires are mounted on an identical axle of the vehicle. Mounting positions of the first and second tires are symmetrical on the identical axle. The determination unit determines that the first tire has a possibility of failure where the temperature of the first tire is greater than a predetermined threshold, and a difference between the temperatures of the first and second tires is greater than a predetermined first temperature threshold.

Tire failure prediction system and tire failure prediction method

There is an image data processing circuit including a memory storing input image data, the input image data being limited to a specific number of colors or to a specific image range, and a correction processing part replacing, when a predetermined tone change is present between a pixel in image data previous by one frame whose data is stored by the memory and a pixel in image data in a current frame whose data is input, a relevant pixel in the current frame with a color of a specific tone. The memory is built in an integrated circuit included in the correction processing part.

Image data processing circuit and display system

An image compression circuit includes: a transform section configured to transform a plurality of pieces of pixel data into a plurality of pieces of coefficient data; and a quantization section configured to obtain a quantization parameter based on a predetermined number of pieces of the coefficient data, and to quantize the predetermined number of pieces of the coefficient data with use of the quantization parameter.

Image compression circuit, image compression method, and transmission system

A pneumatic tire has a plurality of circumferential main grooves extending in a tire circumferential direction and a plurality of ribs partitioned by the circumferential main grooves in a tread portion. When viewing a cross-section from a tire meridian direction a contact patch of the center ribs is formed from a smooth curved line forming a convex on an outer side in a tire radial direction and a contact patch of the shoulder rib is formed from a smooth curved line forming a convex on an inner side in the tire radial direction. The curved line of the center ribs and the curved line of the shoulder rib have a point of intersection. A distance between an extended line of the curved line of the center ribs and the curved line of the shoulder rib increases from the point of intersection towards an outer side in a tire width direction.

Pneumatic tire with tread having five ribs and four circumferential grooves

An object of the invention is to provide a tire tube which has excellent air impermeability and such excellent durability that the occurrence of cracks in the tube main body is prevented in a contact surface between the tube main body and an inner circumferential surface of the tire. The tire tube of the invention includes a tube main body having a multilayer structure in which at least one rubber layer and at least one thermoplastic resin layer made of a thermoplastic resin or a thermoplastic elastomer composition obtained by blending an elastomer in a thermoplastic resin are laminated together. In at least a region where the tube main body is in contact with the inner circumferential surface of the tire tread part, the rubber layer is placed as the outermost layer of the multilayer structure, and the thermoplastic resin layer is placed inside the outermost layer.

Tire tube

An evaluation method for pneumatic tires and a system thereof, is provided, capable of appropriately evaluating an adverse effect, such as deterioration, of tire temperature by expressing severity of a temperature imposed on a member of tire made of rubber or the like in quantitative and convenient manners. Detection counts are calculated for each detected temperature according to a detection counts calculating unitbased on information of temperatures of pneumatic tires detected by a temperature sensor of a temperature detector. Temperature severity numbers of the pneumatic tires are calculated from a computing equation by a severity calculating unitbased on the detection counts and contribution coefficients of deterioration of tire rubber with temperatures stored in a contribution coefficient storageas parameters. Using the calculated temperature severity number, a determination unitdetermines thermal deterioration of the tire.

Evaluation method for pneumatic tires and system thereof

Disclosed is a pneumatic tire effectively controlling uneven wear occurring in the vicinity of a main groove even if a groove width of the main groove is narrowed due to change in tread radius during inflation. In the pneumatic tire, with regard to the main groove having its groove width narrowed during inflation among a plurality of main grooves provided on a tread surface, both groove walls are inclined so that the groove width becomes wider toward the groove bottom, and a protrusion dividing the groove space in the tire width direction is provided at the groove bottom.

Pneumatic tire including protrusion dividing groove space of main groove having groove width narrowed during inflation

Disclosed is a pneumatic tire effectively controlling uneven wear occurring in the vicinity of a main groove even if a groove width of the main groove is widened due to change in tread radius during inflation. In the pneumatic tire, with regard to a zigzag-shaped main groove having the groove width widened during inflation among a plurality of main grooves provided on a tread surface, an inclination angle of a groove wall near the center with respect to the tread surface is made relatively large in a bent portion near the shoulder, an inclination angle of a groove wall near the shoulder with respect to the tread surface is made relatively large in a bent portion near the center, and regions where the inclination angles of the opposed groove walls are different from each other are uncontinuously arranged in the tire circumferential direction.

Pneumatic tire including zig-zag main grooves

Disclosed is a pneumatic tire effectively controlling uneven wear occurring in the vicinity of a main groove even if a groove width of the main groove is narrowed due to change in tread radius during inflation. In the pneumatic tire, with regard to a zigzag-shaped main groove having the groove width narrowed during inflation among a plurality of main grooves provided on the tread surface, an inclination angle of a groove wall near the shoulder with respect to the tread surface is made relatively large in a bent portion near the shoulder, an inclination angle of a groove wall near the center with respect to the tread surface is made relatively large in a bent portion near the center, and regions where the inclination angles of the opposed groove walls are different from each other are uncontinuously arranged in the tire circumferential direction.

Growing community of inventors

Kanagawa, Japan

Hiroshi Iizuka