Abstract: A charging roll includes a cylindrical base member that has a metal-containing surface, a conductive adhesive layer that includes a halogen atom-containing resin and has surface roughness Rz in a range of 0.5 ?m to 8 ?m on an outer peripheral surface side on the base member, and a conductive elastic layer that is disposed to be brought into contact with the outer peripheral surface of the conductive adhesive layer and includes a halogen atom-containing rubber.

Abstract: A charging roll includes a cylindrical base member that has a metal-containing surface, a conductive adhesive layer that includes a halogen atom-containing resin and has surface roughness Rz in a range of 0.5 ?m to 8 ?m on an outer peripheral surface side on the base member, and a conductive elastic layer that is disposed to be brought into contact with the outer peripheral surface of the conductive adhesive layer and includes a halogen atom-containing rubber.

Abstract: A method for producing a rubber roller includes preparing a rubber composition containing epichlorohydrin rubber and a conductive agent, the epichlorohydrin rubber being an epichlorohydrin-ethylene oxide-allyl glycidyl ether ternary copolymer that contains an ethylene oxide-derived structural unit within a range of 40 mol % or more and 60 mol % or less relative to the entire ternary copolymer, and a content of calcium oxide being 1 part by weight or less relative to 100 parts by weight of the epichlorohydrin rubber; removing a volatile component so that a ratio of the volatile component contained in the rubber composition is 0.8% by weight or less relative to the entire rubber composition; coating a periphery of a core body with the rubber composition to form a rubber composition layer; and vulcanizing the rubber composition layer under atmospheric pressure to form a rubber layer on the periphery of the core body.

Abstract: A rubber roll producing machine includes an outer member that is formed in a cylindrical shape, an inner member that is disposed inside the outer member so as to form an annular passageway between the inner member and the outer member, has an outer peripheral surface with a friction coefficient against a rubber material larger than that of an inner peripheral surface of the outer member in a portion of forming the annular passageway, and has an insertion hole formed at a center portion thereof so as to insert a shaft member therethrough, and a discharge portion which allows the rubber material flowing out from the annular passageway to contact the shaft member coming out from the insertion hole and discharges the rubber material and the shaft member to the outside in an integrated state.

Abstract: In a pneumatic tire composed of a carcass layer crossing between a pair of left and right bead cores, the bead cores comprise a fastening bead core for fastening an end of the carcass layer to be turned up around the fastening bead core, and a non-fastening bead core free from the end of the carcass layer. An inner circumferential radius R2 of the non-fastening bead core is set smaller than an inner circumferential radius R1 of the end of the carcass layer to be turned up around the fastening bead core.

Abstract: In a pneumatic tire composed of a carcass layer crossing between a pair of left and right bead cores, the bead cores comprise a fastening bead core for fastening an end of the carcass layer to be turned up around the fastening bead core, and a non-fastening bead core free from the end of the carcass layer. An inner circumferential radius R2 of the non-fastening bead core is set smaller than an inner circumferential radius R1 of the end of the carcass layer to be turned up around the fastening bead core.

Abstract: A tire/wheel assembly, wherein bent parts (4f) bent outward are formed at the leg end parts of an annular shell (4), an inclination angle (?1) of a line segment L1 extending from the axially outer end (P3) of the bent part (4f) through the apex (P1) of a hump (1f) on a rim relative to a direction perpendicular to a tire axis is set to within ±5° in a cross section orthogonal to the circumferential direction of the annular shell (4), the area (4s) of the annular shell equal to the height (B) of at least 35% of the height (A) from the radially inner end of the annular shell is formed linearly, the inclination angle (?2) of an extension line (L2) along the inner surface of the linear area (4s) relative to the direction perpendicular to the tire axis is 15 to 30° in axial inner side, and the extension line (L2) passes between the apex (P1) of the hump (1h) and the toe tip (P2) of a tire bead part.

Abstract: A tire forming system includes a band forming machine, a shaping forming machine, a belt/tread forming machine, means for supplying a band member and means for supplying a belt/tread member. The means for supplying the band member include an inner liner supply means, carcass supply means, band rubber parts supply means and bead supply means. The means for supplying the belt/tread member include belt supply means and tread rubber parts supply means. The means for supplying the band member and the means for supplying the belt/tread member are operative to cooperate with one another to continuously in series form a plurality of tires having different tire sizes.

Abstract: A tire/wheel assembly, wherein bent parts (4f) bent outward are formed at the leg end parts of an annular shell (4), an inclination angle (?1) of a line segment L1 extending from the axially outer end (P3) of the bent part (4f) through the apex (P1) of a hump (1f) on a rim relative to a direction perpendicular to a tire axis is set to within ±5° in a cross section orthogonal to the circumferential direction of the annular shell (4), the area (4s) of the annular shell equal to the height (B) of at least 35% of the height (A) from the radially inner end of the annular shell is formed linearly, the inclination angle (?2) of an extension line (L2) along the inner surface of the linear area (4s) relative to the direction perpendicular to the tire axis is 15 to 30° in axial inner side, and the extension line (L2) passes between the apex (P1) of the hump (1h) and the toe tip (P2) of a tire bead part.

Abstract: Disclosed are a tire/wheel assembly and a run-flat support member which are designed to be lightened without losing durability during run-flat traveling. The tire/wheel assembly is constituted as follows: a pneumatic tire is fit to a wheel rim; and the run-flat support member constituted of a circular shell and elastic rings is inserted into a cavity of the pneumatic tire. The circular shell has a support surface thereof extended toward the periphery of the pneumatic tire and leg portions along each side of the support surface. The elastic rings support the leg portions of the circular shell on the rim. In the tire/wheel assembly, contact portions and noncontact portions for the circular shell are alternately formed on the elastic rings in a shell circumferential direction.

Abstract: Disclosed are a tire/wheel assembly and a run-flat support member which are designed to be lightened without losing durability during run-flat traveling. The tire/wheel assembly is constituted as follows: a pneumatic tire is fit to a wheel rim; and the run-flat support member constituted of a circular shell and elastic rings is inserted into a cavity of the pneumatic tire. The circular shell has a support surface thereof extended toward the periphery of the pneumatic tire and leg portions along each side of the support surface. The elastic rings support the leg portions of the circular shell on the rim. In the tire/wheel assembly, contact portions and noncontact portions for the circular shell are alternately formed on the elastic rings in a shell circumferential direction.

Abstract: A pneumatic tire for an automobile having a tread portion in a two-layered structure of a cap tread layer and an under tread layer, in which the under tread layer is constituted by a center region defined by a range of 30 through 70% of a width of a first belt layer and up to 0.5 through 2.0 mm in a tire diameter direction from a second belt layer and a shoulder region extended from both end portions of the first belt layer continuously from the center region to an outer side by 30 mm at maximum on one side and having a thickness of 1.0 through 5.

Abstract: The invention discloses a tire forming system including a band forming machine, a shaping forming machine and a belt/tread forming machine, in each of which setting conditions of a tire size can be optionally changed, and having transport means for delivering a semi-fabricated product to each forming machine, wherein there are provided:

Abstract: A large number of sub-grooves inclining in the same direction as a tire rotating direction of a tire circumferential direction towards the outside of a car and extending in a tire width-wise direction are disposed on a tread surface of a tire the tire rotating direction of which is designated in one direction, and at least one main groove extending straight in the tire circumferential direction is disposed in an inside region of the tread surface inner than a tire center line. Further, semi-main grooves crossing the sub-grooves and inclining in an opposite direction to that of the sub-grooves are disposed at a predetermined pitch in the tire circumferential direction in an outside region of the tread surface outer than the tire center line. In this way, a pneumatic radial tire of the present invention has a block type tread pattern having asymmetric directionality.

Abstract: A pneumatic tire for passenger cars, formed on its tread surface with at least one main groove extending in the circumferential direction of the tire, a number of sub-grooves extending in the widthwise direction of the tire, and a plurality of sub-main grooves extending at an angle of inclination within a range of 3.degree. to 30.degree. to the circumferential direction of the tire and to a length greater than a defined contact length of the tire, the or each main groove having a groove depth of 65% or more of the thickness of a tread rubber and a groove width which is greater than its groove depth and is within a range of 6 to 9% of a tread expansion width, each sub-main groove including such a wider or broader portion which has a groove depth of 65% or more of the thickness of the tread rubber and a groove width which is greater than its groove depth and is within a range of 3.