Abstract: A pneumatic tire includes a plurality of center lug grooves disposed at intervals in a tire circumferential direction that extend crossing a tire equator line and include a first groove turning portion and a second groove turning portion; a plurality of shoulder lug grooves disposed in the intervals between the plurality of center lug grooves in the tire circumferential direction extending outward in the tire width direction, an inner end in the tire width direction being disposed outward of an end of the center lug groove in the tire width direction; a pair of circumferential main grooves to which the ends of the center lug grooves and the inner ends of the plurality of shoulder lug grooves in the tire width direction alternately connect; and a circumferential secondary groove disposed around the entire circumference of the pneumatic tire with a wave-like shape.
Abstract: Provided is a member surface treatment method for treating a surface of a member containing a crystallizable thermoplastic resin by a dry treatment, wherein the dry treatment is performed so as to satisfy the following conditions X and Y. Condition X: ?d/?d0 is not less than 1.0 and less than 1.4. Condition Y: ?p/?p0 is not less than 1.2 and less than 40. ?d0 is a non-polar component of surface free energy of the surface before the dry treatment, ?d is a non-polar component of surface free energy of the surface after the dry treatment, ?p0 is a polar component of surface free energy of the surface before the dry treatment, and ?p is a polar component of surface free energy of the surface after the dry treatment.
Abstract: The present technology pertains to a pneumatic tire (1) comprising: a pair of bead portions (2); sidewall portions (3) connected to the pair of bead portions; and a tread portion (10) connected to the sidewall portions. A ratio between a total width (SW) and an outer diameter (OD) of the pneumatic tire satisfies the relationship SW/OD?0.3. Moreover, if the length along a tread profile (12) from a first side second reference point (Q1) to a second side second reference point (Q2) is the developed tread width (TDW), and an angle formed between a straight line that connects the second reference points and the profile center (cc), and a straight line parallel to the tire width direction is an amount of depression (?), the following relationships are satisfied: 0.8?TDW/SW<1, and 1.5°???4.5°.
Abstract: A pneumatic tire includes a center land portion, intermediate land portions, and shoulder land portions, the land portions being partitioned and formed by four main grooves, and a plurality of lug grooves and sipes disposed in the land portions. The lug grooves disposed in the shoulder land portions do not communicate with the second main grooves. The groove area ratio is greater in the center region than in the shoulder regions. The distance (L1) from the tire equator to the center in the tire width direction of the first main groove is 15 to 25% of the distance (L) from the tire equator to the ground contact edge. The distance (L2) from the tire equator to the center in the tire width direction of the second main groove is 50 to 65% of the distance (L) from the tire equator to the ground contact edge.
Abstract: An abrasion tester and testing method. The testing method comprises setting a running speed of a rubber sample fixed to an outer surface of an annular belt member stretched between a pair of pulleys to a desired speed; setting a pressing load applied by a contact member to a desired pressing load via an anchor member; selecting, as the contact member, a desired contact member from a plurality of types of contact members with different rubber sample surface contacting tip specifications; pressing the contact member against the surface of the rubber sample running by the rotation of the pulleys; and obtaining an amount of scratch abrasion of the rubber sample using a calculation unit on the basis of a cross-sectional shape of the surface of the rubber sample detected by a shape sensor.
Abstract: The present technology provides a one-part moisture curable adhesive composition and a production method thereof. The adhesive composition contains: a preliminary composition containing a urethane prepolymer and a reaction product of an aliphatic isocyanate A and an aminosilane compound B or a monoterpene alcohol; and a dimethyl tin catalyst represented by Formula (1) below. In Formula (1), X1 and X2 each independently represent a divalent heteroatom and R1 and R2 each independently represent a hydrocarbon group that may have a heteroatom.
Abstract: The present technology provides a pneumatic tire having a strip-shaped sound-absorbing member bonded on the inner surface of the tire includes a plurality of belt layers, two or more belt cover layers, one or more belt edge cover layers, and a thread rubber layer. The thickness of the tread rubber layer is substantially uniform in the region X where the sound-absorbing member is located so that the difference between the thickness t1 at an end of the sound-absorbing member and the thickness t0 at the position of the tire equator is equal to or less than 0.5 mm. The thickness of the tread rubber layer is smaller in the region Y where the belt edge cover layer is located than in the region X so that the difference between the minimum value t2 of the thickness in the region Y and the thickness t0 ranges from 1.0 to 4.0 mm.
Abstract: A cyanate ester resin composition contains: a cyanate ester resin; a curing agent or a curing accelerator; silica microparticles; and core-shell rubber particles; in which the resin composition includes from 1 to 5 parts by mass of the silica microparticles and from 2 to 10 parts by mass of the core-shell rubber particles based on 100 parts by mass of the cyanate ester resin, and a mass ratio of the silica microparticles to the core-shell rubber particles is from 1/1 to 1/5.
February 28, 2018
Date of Patent:
July 28, 2020
The Yokohama Rubber Co., LTD.
Mitsuhiro Iwata, Yukihiro Kamimura, Tomohiro Ito
Abstract: The present technology provides a rubber composition for sidewalls containing, a diene rubber, from 10 to 120 parts by mass of a carbon black, and from 3 to 30 parts by mass of an acid-modified polyolefin having a melting point of from 100 to 150° C. per 100 parts by mass of the diene rubber, a main chain of the acid-modified polyolefin being a homopolymer of an olefin; and a pneumatic tire using the same in sidewalls thereof.
Abstract: A wear testing device includes a plurality of holding portions that hold rubber samples. The rubber samples held by each of the plurality of holding portions are independently and simultaneously pressed against a circumferential surface of a rotation body in rotation by a pressing mechanism so that abrasion debris of each of the rubber samples produced via this contact falls downward.
Abstract: The present invention provides: a rubber composition for tires which has excellent processability and has excellent low heat build-up when formed into a tire; and a pneumatic tire using the same. The rubber composition for tires of the present invention is a rubber composition for tires, the rubber composition containing a diene rubber (A) and a microparticle (B), a vinyl group content of the diene rubber (A) being from 5 to 35 mass %, the microparticle (B) being a mercapto group-containing organic microparticle in which a crosslinkable oligomer or polymer (b1) is crosslinked, an average particle size of the microparticle (B) being from 1 to 200 ?m, and a content of the microparticle (B) being from 1 to 55 parts by mass per 100 parts by mass of the diene rubber (A).
Abstract: A rubber composition for tires of the present technology contains a diene rubber, silica, and a predetermined alkyltrialkoxysilane; the diene rubber containing a butadiene rubber and a particular conjugated diene rubber, a content of the butadiene rubber in the diene rubber being 20 mass % or greater and a content of the particular conjugated diene rubber in the diene rubber being from 30 to 80 mass %; an average glass transition temperature of the diene rubber being from ?65 to ?45° C.; the particular conjugated diene rubber being a conjugated diene rubber produced by a particular production method and having predetermined ranges of aromatic vinyl unit content, vinyl bond content, and weight average molecular weight.
Abstract: A tire operation service system includes a tire information monitoring device to monitor information on a tire and detect position information and unique identifying information, a tire operation server including a user information database stored with user information corresponding to the identifying information and a shop information database stored with position information on each shop and connected to the tire information monitoring device via a communication network, and a shop terminal and a user terminal connected to the tire operation server via a communication network, wherein the tire operation server includes a user information extraction unit, a nearby shop extraction unit, a shop-with-handling-ability extraction unit, and a shop information transmission unit.
Abstract: A heavy duty pneumatic tire comprises an innerliner including a laminated first liner and second liner; a thickness of the first liner being 1.2 to 1.9 mm; a thickness of the second liner being 1.2 to 1.6 mm; a total thickness of the first and second liners being 2.4 to 3.4 mm; the first and second liners being made of rubber compositions 1 and 2; rubber composition 1 containing 5 to 50 parts by weight of a plate-like inorganic filler having a particle size of 4.9 to 7.5 ?m and an aspect ratio of 3.0 to 7.0 per 100 parts by weight of a diene rubber containing 50 to 100 wt. % of butyl rubber; and rubber composition 2 containing 0.05 to 0.5 parts by weight of an organic metal salt as metal content per 100 parts by weight of a diene rubber containing at least 50 wt. % of natural rubber.
Abstract: A conveyor belt 10 is formed with a belt core body 14 covered by a cover rubber 12. The cover rubber 12 is formed with a shock resistance performance evaluation index, i.e., the product of an elongation at break Eb, a tensile strength at break TSb, and a loss tangent tan ? of 6000 or greater. The loss tangent tan ? is the ratio between a storage modulus and a loss modulus calculated from a stress when vibrations of a predetermined frequency are applied to cover rubber 12. The measurement conditions of the loss tangent tan ? are determined on the basis of a speed of an impact applied under the use conditions of the conveyor belt 10.