Abstract: A distribution information acquisition unit is configured to acquire distribution information including identification information of a user as a distribution destination of setting information which is used for access to a work vehicle. An access information acquisition unit is configured to acquire access information including identification information of the user who accesses the work vehicle. A fraudulence determination unit is configured to compare the identification information related to the access information with the identification information related to the distribution information to determine whether or not fraudulent access has occurred.

Abstract: A distribution information acquisition unit is configured to acquire distribution information including identification information of a user as a distribution destination of setting information which is used for access to a work vehicle. An access information acquisition unit is configured to acquire access information including identification information of the user who accesses the work vehicle. A fraudulence determination unit is configured to compare the identification information related to the access information with the identification information related to the distribution information to determine whether or not fraudulent access has occurred.

Abstract: The present invention has its object to provide a high performance studless tire, which has both good braking force and high handling stability on ice or snow, at higher productivity and at a lower price for customers. The studless tire comprises a tread made of a rubber composition that contains 0.5 to 5.0 parts by mass of a fatty acid and/or a derivative of the fatty acid per 100 parts by mass of a rubber component.

Abstract: The present invention has its object to provide a rubber composition for a studless tire that contributes to both good braking force and high handling stability on ice or snow, and a high performance studless tire using the rubber composition. The rubber composition for the studless tire contains: a mixture of a zinc salt of an aliphatic carboxylic acid and a zinc salt of an aromatic carboxylic acid; an oil or a plasticizer; and a rubber component that comprises 40% by mass or more of a butadiene rubber relative to 100% by mass of a total amount of the rubber component.

Abstract: The present invention has its object to provide a high performance studless tire for a passenger vehicle which has both good braking force and high handling stability on ice or snow. The studless tire for a passenger vehicle comprises a tread having a total sulfur content of 0.7% by mass or less and having a crosslink density of 2.0×10?5 mol/cm3 or higher.

Abstract: The present invention provides a rubber composition for a tire containing 1 to 20 parts by weight of nonmetal fibers having an average fiber diameter of 15 to 100 ?m and 1 to 30 parts by weight of fillers having at least 2 protrusions in which the length of the protrusion is 0.5 to 3.1-fold of the average fiber diameter of the nonmetal fibers, based on 100 parts by weight of a diene rubber and a pneumatic tire using thereof for a purpose of improving frictional performance on ice.

Abstract: A rubber composition controlling the increase of aging hardness of a studless tire and keeping good performance on snow and ice for long period is provided. A rubber composition for a studless tire including at most 0.5 part by weight of sulfur and 1 to 30 parts by weight of an organic vulcanizing agent satisfying the general formula (1): —(R—Sx)n—??(1) (wherein R is (CH2—CH2—O)m—CH2—CH2, x is an integer of 3 to 6, n is an integer of 10 to 400 and m represents an integer of 2 to 5) based on 100 parts by weight of a rubber component, wherein the content of a natural rubber and/or a polybutadiene rubber is at least 80% by weight in the rubber component, and tan ? peak temperature Tg is at most ?50° C. and rubber hardness at 0° C. is at most 64.

Abstract: The present invention has its object to provide a high performance studless tire, which has both good braking force and high handling stability on ice or snow, at higher productivity and at a lower price for customers. The studless tire comprises a tread made of a rubber composition containing 2.2 to 10 parts by mass of a fatty acid and/or a derivative of the fatty acid per 100 parts by mass of a rubber component, the tread having a JIS-A hardness of 50 or less.

Abstract: The present invention provides a run-flat tire that can improve both of ride quality and run-flat performance. The run-flat tire of the present invention comprises a sidewall-reinforcing layer prepared by using a rubber composition comprising non-metallic short fibers having an average fiber diameter of 1 to 100 ?m and an average fiber length of 0.1 to 20 mm in an amount of 5 to 120 parts by weight on the basis of 100 parts by weight of a diene rubber, the non-metallic short fibers being oriented in the circumferential direction of the tire.

Abstract: The present invention provides a tread rubber composition for a studless tire having favorable performance on ice and snow and excellent abrasion resistance while reducing strain dependence of hardness of the tread rubber and maintaining rigidity on roads that are not covered with snow and relates to a tread rubber composition for a studless tire, which comprises a diene rubber containing, in a total amount of 80% by mass or more, natural rubber and polybutadiene rubber; silica in an amount of 10 to 150 parts by mass per 100 parts by mass of the diene rubber; and carbon black in an amount of 3 to 50 parts by mass per 100 parts by mass of the diene rubber, wherein the diene rubber contains 10% by mass or more of a polybutadiene rubber modified by a compound represented by the formula (I): R1, R2 and R3 being independently an alkyl group, analkoxy group, a silyloxy group, an acetal group, a carboxyl group, a mercapto group, or a derivative thereof; R4 and R5 being independently a hydrogen atom or an alkyl g

Abstract: An earth-friendly tire using raw materials derived from non-petroleum resources instead of all or part of raw materials derived from petroleum resources currently used for tires. The tire is prepared by using a natural rubber instead of a synthetic rubber; an inorganic filler and/or a biofiller instead of carbon black; vegetable oil instead of petroleum oil; and natural fiber instead of synthetic fiber so that the tire has a non-petroleum raw material in an amount of at least 75 % by weight based on the total weight of the tire.

Abstract: The object of the present invention is to provide a rubber composition suitable for a studless tire, which can inhibit rubber hardness increase with time and reveals excellent performance on ice and snow for a long time. The present invention relates to a rubber composition comprising 1 to 60 parts by weight of hydrogenized liquid polybutadiene based on 100 parts by weight of a rubber component containing at least 80% by weight of a natural rubber and a butadiene rubber, wherein a peak temperature of tan ? is at most 45° C. and rubber hardness at 0° C. is at most 64.

Abstract: The present invention provides a rubber composition for a tire containing 1 to 20 parts by weight of nonmetal fibers having an average fiber diameter of 15 to 100 ?m and 1 to 30 parts by weight of fillers having at least 2 protrusions in which the length of the protrusion is 0.5 to 3.1-fold of the average fiber diameter of the nonmetal fibers, based on 100 parts by weight of a diene rubber and a pneumatic tire using thereof for a purpose of improving frictional performance on ice.

Abstract: A rubber composition controlling the increase of aging hardness of a studless tire and keeping good performance on snow and ice for long period is provided. A rubber composition for a studless tire including at most 0.5 part by weight of sulfur and 1 to 30 parts by weight of an organic vulcanizing agent satisfying the general formula (1): —(R—Sx)n—??(1) (wherein R is (CH2—CH2—O)m—CH2—CH2, x is an integer of 3 to 6, n is an integer of 10 to 400 and m represents an integer of 2 to 5) based on 100 parts by weight of a rubber component, wherein the content of a natural rubber and/or a polybutadiene rubber is at least 80% by weight in the rubber component, and tan ? peak temperature Tg is at most ?50° C. and rubber hardness at 0° C. is at most 64.

Abstract: It is an object of the present invention to lessen strain dependency of hardness of a tread rubber used for a studless tire, have good performance on snow and ice while securing rigidity on non-snow roads, and improve abrasion resistance. The present invention provides a rubber composition for tread used for a studless tire comprising 30 to 150 parts by weight as a total of (1) silica with a nitrogen absorption specific surface area of at most 100 m2/g and (2) silica with a nitrogen absorption specific surface area of at least 180 m2/g based on 100 parts by weight of a rubber component in which a content of a natural rubber and/or a polybutadiene rubber is at least 80% by weight, wherein contents of silica (1) and silica (2) satisfy the formula below: [Content of silica (1)]×0.2?[Content of silica (2)]?[Content of silica (1)]×6.5, tan ? peak temperature Tg is at most ?50° C., and rubber hardness at 0° C. is at most 64.

Abstract: The present invention has its object to provide a tread rubber composition for a studless tire having favorable performance on ice and snow and excellent abrasion resistance while reducing strain dependence of hardness of the tread rubber and maintaining rigidity on roads that are not covered with snow. The present invention relates to a tread rubber composition for a studless tire, which comprises a diene rubber containing, in a total amount of 80% by mass or more, natural rubber and polybutadiene rubber; silica in an amount of 10 to 150 parts by mass per 100 parts by mass of the diene rubber; and carbon black in an amount of 3 to 50 parts by mass per 100 parts by mass of the diene rubber. The diene rubber contains 10% by mass or more of a polybutadiene rubber modified by a compound represented by the formula (1).

Abstract: The invention provides a rubber composition to form a bead apex provided between a non-folded back part and a folded back part of an annular ply folded back so as to surround a bead wire at both ends of annular ply, including a rubber component containing at least one of a natural rubber and an epoxidized natural rubber, and including not less than 30 parts by mass of silica and not less than 0.1 part by mass and not more than 10 parts by mass of a quinone diimine compound relative to 100 parts by mass of the rubber component, a bead apex, and a tire.

Abstract: The present invention has its object to provide a high performance studless tire for a passenger vehicle which has both good braking force and high handling stability on ice or snow. The studless tire for a passenger vehicle comprises a tread having a total sulfur content of 0.7% by mass or less and having a crosslink density of 2.0×10?5 mol/cm3 or higher.

Abstract: The present invention has its object to provide a high performance studless tire, which has both good braking force and high handling stability on ice or snow, at higher productivity and at a lower price for customers. The studless tire comprises a tread made of a rubber composition that contains 0.5 to 5.0 parts by mass of a fatty acid and/or a derivative of the fatty acid per 100 parts by mass of a rubber component.

Abstract: The present invention has its object to provide a high performance studless tire, which has both good braking force and high handling stability on ice or snow, at higher productivity and at a lower price for customers. The studless tire comprises a tread made of a rubber composition containing 2.2 to 10 parts by mass of a fatty acid and/or a derivative of the fatty acid per 100 parts by mass of a rubber component, the tread having a JIS-A hardness of 50 or less.