The Yokohama Rubber Co.

Kawasaki, Japan

The Yokohama Rubber Co.

Kawasaki, Japan
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Patent
The Yokohama Rubber Co. | Date: 2017-01-04

A pneumatic tire is provided that is capable of improving wet performance, dry performance, and uneven wear resistance in a well-balanced manner. In the pneumatic tire, for which a mounting direction is designated when the tire is mounted on a vehicle, a first main groove and a second main groove extending in a tire circumferential direction are provided in a tread portion. A distance GL1 of the first main groove is set so as to be 6% or less of a ground contact half width TL/2, a distance GL2 of the second main groove is set so as to be from 40% to 65% of the ground contact half width TL/2, and a first rib, a second rib, and a third rib are defined in the tread portion. Further, a plurality of first lug grooves, a plurality of second lug grooves, a plurality of third lug grooves, a plurality of fourth lug grooves, and a plurality of fifth lug grooves are provided in the tread portion, each of the first lug grooves being positioned between a ground contact edge on an inner side of the vehicle and the second main groove and both ends thereof being closed, one end of each of the second lug grooves being communicated with the second main groove and the other end thereof being closed, one end of each of the third lug grooves being communicated with the first main groove and the other end thereof being closed, each of the fourth lug grooves being positioned between a ground contact edge on an outer side of the vehicle and the first main groove and both ends thereof being closed, and each of the fifth lug grooves being positioned between the ground contact edge on the outer side of the vehicle and the fourth lug groove and both ends thereof being closed.


Patent
The Yokohama Rubber Co. | Date: 2017-04-05

Provided is a reactive hot-melt adhesive composition which has excellent water resistant adhesion. The reactive hot-melt adhesive composition of the present invention is a reactive hot-melt adhesive composition that is moisture curable and that contains: a urethane prepolymer having an isocyanate group, a (meth)acrylic resin, and an adhesion promoter containing at least an isocyanate group-containing (meth)acrylamide compound.


Patent
The Yokohama Rubber Co. | Date: 2017-03-15

Provided is a mold cleaning system which makes it possible to prevent scratches on a molding surface while efficiently removing dirt therefrom without requiring a hand operation by a person, even for molds having complicated molding-surface shapes. On the basis of an identification mark (D) assigned to a mold (11) and detected by a mark detector (3a) when cleaning the mold (11), the mold cleaning system obtains shape data for the molding surface (12) of the mold (11) which is stored in a database (8), and on the basis of the obtained shape data, the mold cleaning system controls the movement of arms (6a, 6b) using the control device (7), moves a laser head (4) along the molding surface (12) thereof while irradiating with a laser beam (L) supplied by a laser oscillator (2), and as a result, removes the dirt (X) adhered to the molding surface (12).


Patent
The Yokohama Rubber Co. | Date: 2017-03-01

A method of manufacturing a pneumatic tire and a manufacturing device for a pneumatic tire capable for suppressing heat degradation in a base tire and forming a tread portion with high dimensional precision. A rigid inner mold (2) made of metal is brought into contact with a tire inner surface across an area corresponding to a tread portion (TR) of the base tire (BT), the strong rigid inner mold (2) supporting the base tire (BT) from the inner side. In this state, unvulcanized rubber (R) is injected into a cavity (11) of a tread mold (10) that covers an outer circumferential surface of the base tire (BT) corresponding to the tread portion (TR). Via vulcanization of this unvulcanized rubber R, a tread portion (TR) is formed on the outer circumferential surface of the base tire (BT) and the tread portion (TR) is integrated with the outer circumferential surface.


Patent
The Yokohama Rubber Co. | Date: 2017-04-05

The present invention is to provide a urethane adhesive composition which exhibits excellent adhesion to a base material. A urethane adhesive composition of the present invention contains: a urethane prepolymer having isocyanate groups; and a monosulfide compound which has a monosulfide bond and a hydrolyzable silyl group and in which the monosulfide bond and a silicon atom in the hydrolyzable silyl group are bonded to each other.


Patent
The Yokohama Rubber Company | Date: 2017-03-01

In order to reduce weight and cost while maintaining the mounting strength of fixtures on a wall panel, a storage rack (10) is mounted on a wall panel (18) via a reinforcing thin sheet (24) and a synthetic resin rivet (26). The reinforcing thin sheet (24) is mounted on the inner surface (22A) of the surface member (22) at a location at which the storage rack (10) is arranged. A rivet insertion hole (25) is formed penetrating the surface member (22) and the reinforcing thin sheet (24). Leg pieces (2804) of the pre-assembled rivet (26) are inserted into the rivet insertion hole (25) from the mounting hole (1602) in the storage rack (10), and a flange portion (2802) is brought into contact with a second vertical panel (16). An expanding shaft portion (30B) of the expansion member (30) is pushed into an inner peripheral portion of an expanded member (28), forming leg piece parts (28A) expanded to a dimension larger than the diameter of the rivet insertion hole (25) on the leg piece (2804) parts projecting from the reinforcing thin sheet (24).


Patent
The Yokohama Rubber Co. | Date: 2017-03-08

A method of manufacturing a marine hose that includes a sponge layer and has good appearance. The marine hose includes at least a base hose (2), a sponge layer, a foam rubber layer, and a cover rubber layer (3). The method comprising the steps of:wrapping a sponge layer (A) around the outside of the base hose 2;wrapping a foam rubber layer (B) around the outside of the sponge layer (A), the foam rubber layer (B) containing an unvulcanized foam rubber composition;wrapping a cover rubber layer (3) around the outside of the foam rubber layer (B); andvulcanizing the wrapped assembly; whereinthe foam rubber composition includesa rubber component containing as a main component at least one selected from the group consisting of natural rubber, styrene butadiene rubber, chloroprene rubber, ethylene propylene rubber, ethylene propylene diene rubber, andreclaimed rubber;and, per 100 parts by mass of the rubber component, from 1.1 to 50 parts by mass of a blowing agent and from 1.1 to 50 parts by mass of a blowing aid; and a blow ratio of the foam rubber composition after vulcanization is 1.1 or greater.


Patent
The Yokohama Rubber Co. | Date: 2017-02-15

A method and a device for inspecting engravings in a tire mold capable of determining the suitability of engravings formed on a surface of an annular side plate, which is a component of the tire mold, in a reduced time and with high precision. The method comprises the steps of:inputting in advance into a data processing device (2) two-dimensional image master data (9) of an engraving (8) formed on a surface (7a) of a side plate (7) in a plan view using basic data set as a reference, the image master data (9) having a radial component (t) and a radial position (r) of the engraving (8) corrected on the basis of a locus length in a radial direction of the surface (7a) of the side plate (7);generating two-dimensional image actual measurement data, the image actual measurement data having a radial component and a radial position of three-dimensional data acquired via actual measurement corrected on the basis of a radial locus length of a surface (7a) of a side plate (7) on which actual measurement was performed; anddetermining whether or not an image shape and an image position of the image actual measurement data (10) is within a tolerable range via comparing image contours of the image master data (9) and the image actual measurement data (10) by the data processing device (2).


Patent
The Yokohama Rubber Co. | Date: 2017-09-27

Provided is a conveyor belt capable of improving both wear resistance and impact resistance of an upper cover rubber in a compatible manner. The upper cover rubber (3) has a configuration in which a wear resistance layer (3a) and an impact resistance layer (3b) are layered in this order from an outer peripheral side of the conveyor belt. The wear resistance layer (3a) has a loss coefficient of from 0.03 to 0.25 and a loss elastic coefficient of from 0.20 MPa to 6.50 MPa at 20C. The impact resistance layer (3b) has a loss coefficient of from 0.15 to 0.70 and a loss elastic coefficient of from 1.5 MPa to 30.0 MPa at 20C.


Patent
The Yokohama Rubber Co. | Date: 2017-09-13

Provided are a vulcanization device for a pneumatic tire and a method for vulcanizing a pneumatic tire, that can maintain sufficient internal pressure applied to a green tire in the initial stage of vulcanization and prevent over-vulcanization with no increase in equipment size. A pressurizing medium having a relatively low pressure is supplied through a pressurizing medium low-pressurization/supply line (6L2) into a vulcanization bladder (2) having a tube-like shape inserted into a green tire (G) in a vulcanization mold (10) to inflate the vulcanization bladder. Thereafter, a heating medium is supplied through a heating medium supply line (6L3) into the vulcanization bladder (2). Then, a pressurizing medium having a relatively high pressure is supplied through a pressurizing medium supply line (6L1) into the vulcanization bladder (2) to increase internal pressure of the vulcanization bladder (2) while the media in the vulcanization bladder (2) are circulated through a circulation line (8L) extending outside the vulcanization bladder (2), thereby vulcanizing the green tire (G).

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