Kawasaki, Japan
Kawasaki, Japan

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Patent
The Yokohama Rubber Co. | Date: 2017-05-03

Provided is a rubber composition for tires by which low rolling resistance and wet grip performance are enhanced beyond conventional levels. The rubber composition for tires comprises a diene rubber, silica, and a silane coupling agent, and is characterized in that a function v of a shear modulus G of the rubber composition at 0.28% shear stress at 110C, a CTAB specific surface area (CTAB) of the silica, a volume fraction () of the silica in the rubber composition, and a stress at 100% elongation (M_(100)) of the rubber composition satisfies the relationship of the following equation (i): G = K v. In equation (i), K is a coefficient greater than 0 and not greater than 450, and v is represented by the following equation (ii): v = (1 + 0.0258 CTAB M_(100)) and is a real number not less than 2.5 and not greater than 20.


Patent
The Yokohama Rubber Co. | Date: 2017-05-03

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 manual operation by a person, even for molds having complicated molding-surface shapes. When cleaning a mold (11), the mold cleaning system acquires three-dimensional image data of a molding surface (12) of the mold (11) by a camera (3) and, on the basis of the acquired image data, the mold cleaning system controls the movement of arms (6a, 6b) using a control device (7), moves a laser head (4) along the molding surface (12) while irradiating with a laser beam (L) supplied by a laser oscillator (2) and, as a result, removes dirt (X) adhered to the molding surface (12).


Patent
The Yokohama Rubber Co. | Date: 2017-04-26

Provided is a pneumatic tire with steering stability performance, hydroplaning resistance performance, and uneven wear resistance performance enhanced in a well-balanced manner. A profile line (PL1) of a center land portion (X) protrudes further outward in the tire radial direction than a standard profile line (PL0). Profile lines (PL2, PL3) of sub-center land portions (Y1, Y2) and shoulder land portions (Z1, Z2) defined outward of two center main grooves (14a, 14b) in the tire width direction protrude outward in the tire radial direction further than the standard profile line (PL0). The shoulder land portions (Z1, Z2) are defined further outward than the sub-center land portions (Y1, Y2). Further, the profile lines (PL2, PL3) of the sub-center land portions (Y1, Y2) and the shoulder land portions (Z1, Z2) each include an outermost point (A2, A4) of the corresponding center main groove (14a, 14b) in the tire width direction and both end points (A5, A6, A7, A8) of the corresponding shoulder main groove (14c, 14d) in the tire width direction. A groove area ratio (Go) of a vehicle mounting outer side region and a groove area ratio (Gi) of a vehicle mounting inner side region satisfy the relationship Gi > Go.


Patent
The Yokohama Rubber Co. | Date: 2017-05-03

Provided are a device and a method for inspecting a cylindrical member, whereby it is possible to accurately assess a widthwise misalignment of a cylindrical member obtained by molding a strip-shaped member into a cylindrical shape. During inspection of a cylindrical member (9a) obtained by winding a strip-shaped member (8a) around a molding drum (5), placing a longitudinal distal end (E1) and a longitudinal rear end (E2) of the strip-shaped member (8a) against each other and molding the strip-shaped member (8a) into a cylindrical shape, a drum-widthwise end position (L1) of the strip-shaped member (8a) wound around the molding drum (5) is detected by a position sensor (2) along the entire length of the strip-shaped member (8a) in the longitudinal direction thereof, a degree of widthwise misalignment of the strip-shaped member (8a) wound around the molding drum (5) is calculated by a control unit (4) on the basis of detection data from the position sensor (2) and position data of drum-widthwise end faces (DL) that are perpendicular to a drum axial center (DX) of the molding drum (5), and the widthwise misalignment of the strip-shaped member (8a) is determined to be inside or outside an allowable range on the basis of the calculation result.


Patent
The Yokohama Rubber Co. | Date: 2017-05-03

An object of the present invention is to provide a rubber composition capable of achieving both excellent vulcanization properties as low heat build-up, and a pneumatic tire including such a composition. The rubber composition of the present invention is a rubber composition containing a diene rubber (A), a silica (B), a silane coupling agent (C), and an acid-modified polyolefin (D);the diene rubber (A) containing not less than 30 mass% of an aromatic vinyl-conjugated diene copolymer rubber;the acid-modified polyolefin (D) having at least one type of repeating unit selected from the group consisting of propylene, 1-butene, and 1-octene;a content of the silica (B) being from 5 to 150 parts by mass per 100 parts by mass of the diene rubber (A); anda total content of the silane coupling agent (C) and the acid-modified polyolefin being from 5 to 30 parts by mass per 100 parts by mass of the diene rubber (A).


Patent
The Yokohama Rubber Co. | Date: 2015-06-24

Provided is a mold cleaning system. When cleaning a mold, the mold cleaning system acquires three-dimensional image data of a molding surface of the mold by a camera and, on the basis of the acquired image data, the mold cleaning system controls the movement of arms using a control device, moves a laser head along the molding surface while irradiating with a laser beam supplied by a laser oscillator and, as a result, removes dirt adhered to the molding surface.


Patent
The Yokohama Rubber Co. | Date: 2015-06-12

Provided is a pneumatic tire where a total width (SW) and an outer diameter (OD) satisfy the relationship SW/OD0.3; an inner diameter (ID) and an outer diameter (OD) satisfy the relationship ID/OD0.7; as viewed in a tire meridional cross section, an area (X1) (mm^(2)) of a first region (R1) and a periphery length (Y1) (mm) of an inner peripheral surface of the first region (R1) have a ratio X1/Y1 of 12 or greater and 30 or less; and an area X2 (mm^(2)) of a second region (R2) and a periphery length (Y2) (mm) of an inner peripheral surface of the second region (R2) have a ratio X2/Y2 of 10 or greater and 15 or less.


Patent
The Yokohama Rubber Co. | Date: 2015-06-19

A tire noise reduction device includes a noise absorbing member formed of a porous material, a band member formed of a thermoplastic resin, the band member being an annular shape for mounting the noise absorbing member on a tire inner surface, a bonding member bent into a V-shaped cross section, and a band bonding section at a key point where the noise absorbing member, the band member, and the bonding member are bonded by interposing the noise absorbing member between the bonding member and the band member. The band member has a band width WB satisfying the following formula (a). A band thickness H (mm) of the band bonding section and a thickness h (mm) of the band member have a relationship satisfying the following formula (b). 20 mmWBnoise absorbing member width (mm) (a) 0.4H/h0.9 (b)


Patent
The Yokohama Rubber Co. | Date: 2015-06-03

A rubber composition for a tire tread is a rubber composition containing from 66 to 110 parts by weight of a filler containing not less than 50 wt. % of a silica per 100 parts by weight of a diene rubber containing not less than 40 wt. % of a terminal-modified styrene-butadiene rubber, from 8 to 35 wt. % of a natural rubber, and from 15 to 40 wt. % of a butadiene rubber; the terminal-modified styrene-butadiene rubber having a terminal functional group derived from a compound reacting with silanol groups; a styrene unit content thereof being from 38 to 48 wt. %; an oil-extended oil content thereof being less than 30 wt. %; a ratio (BR/NR) of a compounded amount of the butadiene rubber (BR) to the natural rubber (NR) being more than 1.0 and not more than 2.5; and an embrittlement temperature of the rubber composition being not more than 45 C.


Patent
The Yokohama Rubber Co. | Date: 2017-05-31

A stud pin (30) arranged in a hole (24) in a tread portion of the pneumatic tire (1), includes: a first flange portion (31) having a first surface that faces the bottom surface of the hole and a second surface that faces in the opposite direction to the first surface; a body (34) connected to the second surface of the first flange portion, and that is arranged in the hole; a tip (35) supported by the body, and that projects to the outer side from the ground contact surface of the tread portion; and a through hole (40) that connects a first opening provided in the first surface and a second opening.

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