Abstract: A tire vulcanizing mold is disclosed capable of accurately providing a clearance, from which air existing between a green tire and a side mold is released, on a side shaping surface and thereby preventing shaping defect. The tire vulcanizing mold includes an upper and lower pair of side molds having side shaping surfaces. Each of the side molds includes a side mold main body, plural pieces, and a clearance provided between the side mold main body and each of the pieces. The side mold main body includes plural recesses, each of which is opened to the side shaping surface and an outer surface, at spaced intervals. Each of the pieces is fitted into the recess and forms the side shaping surface with the side mold main body. The clearance is opened to the side shaping surface and extends from an inner side to an outer side.

Abstract: A tire vulcanization mold disclosed herein includes sectors 13 divided in a tire circumferential direction and molding a tread portion 1, and a pair of upper and lower side plates 11 and 12 molding a sidewall portion 2 of a tire. Mold parting lines 16a and 17a formed by the sectors and the side plates are located in the tread portion 1. A lateral groove molding rib 18 molding a lateral groove 5 in the tread portion is provided to bridge from the sectors 13 to the side plates 11 and 12 and a protrusion molding recess 18a used to mold a protrusion 5a at a groove bottom of the lateral groove 5 is provided to the lateral groove molding rib 18. Mold parting planes 16 and 17 are provided to divide the lateral groove molding rib 18 at a position where the protrusion molding recess 18a is provided.

Abstract: A tire vulcanization mold disclosed herein includes sectors 13 divided in a tire circumferential direction and molding a tread portion 1 of a tire, and a pair of upper and lower side plates 11 and 12 molding a sidewall portion 2 of the tire. Mold parting lines 16a and 17a formed by the sectors 13 and a pair of the upper and lower side plates 11 and 12 are located in the tread portion 1 and set to pass a bend point 8c of a surface design in the tread portion 1.

Abstract: A tire vulcanization mold disclosed herein includes sectors molding a tread portion of the tire and a pair of upper and lower side plates molding a sidewall portion of the tire. Mold parting lines formed by the sectors and a pair of the upper and lower side plates are located in the tread portion. A lateral groove molding rib molding a lateral groove in the tread portion is provided to bridge from the sector to the side plate and a protrusion molding recess used to mold a protrusion at a groove bottom of the lateral groove is provided to the lateral groove molding rib. Mold parting planes including the mold parting lines are provided to divide the lateral groove molding rib where the protrusion molding recess is not provided. An evacuation path from the protrusion molding recess to the mold parting plane is provided to the lateral groove molding rib.

Abstract: A tire vulcanizer is provided which is capable of arranging a sector at a specified position during closing of a mold and suppressing a vulcanization molding defect. The tire vulcanizer includes: the sector that shapes a tread of a tire; paired upper and lower side plates that shape sidewalls of the tire; a segment to which the sector is fixed and which causes the sector to move in a tire radial direction; and mold parting surfaces defined by the sector and the side plates. Mold inner ends of the mold parting surfaces are arranged on the tread, and the mold parting surfaces extend outward in the tire radial direction from the mold inner ends. The sector includes paired upper and lower flange sections which respectively abut the paired upper and lower side plates in a state where the adjacent sectors in the tire circumferential direction tightly contact each other.

Abstract: A tire vulcanizer is disclosed including a sector arranged with respect to a side plate with a high degree of positioning accuracy. The tire vulcanizer includes: the sector that shapes a tread of a tire; a segment to which the sector is fixed and causes the sector to move in a tire radial direction; a bolt that fixes the sector to the segment; a ring-shaped jacket ring provided on an outer side in the tire radial direction of the segment; paired upper and lower side plates that shape sidewalls of the tire; and mold parting surfaces defined by the sector and the paired upper and lower side plates. Mold inner ends of the mold parting surfaces are arranged on the tread, and the mold parting surfaces extend outward in the tire radial direction from the mold inner ends.

Abstract: A tire vulcanization mold according to an embodiment includes a side molding surface, a stencil plate forming a convex mark at an outer surface of a side portion, and an attachment recess depressed in the side molding surface. The stencil plate includes a mark forming concave portion which is depressed from a surface by embossing and a curved portion formed by curving both end portions in a width direction in a direction opposite to the depressed direction of the concave portion. The stencil plate may be attached to the attachment recess by press-inserting. A tip of the curved portion may contact a wall surface of the attachment recess to be elastically deformed so that a curved state of the curved portion increases and the stencil plate may be fixed into the attachment recess by fitting.

Abstract: A tire mold has a tire molding surface. The tire molding surface is pressed against an outer surface of an uncured tire. A vent hole is provided in the tire molding surface. A surface of an outer edge region surrounding an opening of the vent hole is formed by a smooth surface. The smooth surface is smoother than a surface in a peripheral region of the outer edge region.

Abstract: To provide a pneumatic tire with which a magnitude of a lateral force can be adjusted without changing the structure of a tread portion. In a pneumatic tire, an outer profile shape of the pneumatic tire is formed in left and right symmetry with respect to a tire equator, and a thickness of the pneumatic tire from an outer surface to an inner surface is set in left and right asymmetry with respect to the tire equator.

Abstract: A tire curing mold has a vent plug installed to an exhaust hole open to a molding surface. The vent plug has a tubular housing having an exhaust passage, a stem inserted to the housing, and an urging member which urges the steal toward the cavity so as to open the exhaust passage. The stem has a head portion which closes the exhaust passage by contacting with an inner surface of an opening portion in the housing. A top surface of the opening portion in the housing and a top surface of the head portion are formed by a flat surface. The top surface of the opening portion in the housing and the top surface of the head portion in a state in which the exhaust passage is closed are both arranged closer to an opposite side to the cavity than the molding surface.

Abstract: In a tire mold, a side molds and a tread molds include contact portions which come into contact with each other when the molds are closed, the side molds include vent holes extending from an inner surfaces to the contact portions in a normal direction with respect to the inner surfaces, and one of the side molds and the tread molds include communication holes through which the vent holes and outside of the tire mold are brought into communication with each other when the molds are closed.

Abstract: In a tire mold, a side molds and a tread molds include contact portions which come into contact with each other when the molds are closed, the side molds include vent holes extending from an inner surfaces to the contact portions in a normal direction with respect to the inner surfaces, and one of the side molds and the tread molds include communication holes through which the vent holes and outside of the tire mold are brought into communication with each other when the molds are closed.

Abstract: A tire curing mold has a vent plug installed to an exhaust hole open to a molding surface. The vent plug has a tubular housing having an exhaust passage, a stem inserted to the housing, and an urging member which urges the steal toward the cavity so as to open the exhaust passage. The stem has a head portion which closes the exhaust passage by contacting with an inner surface of an opening portion in the housing. A top surface of the opening portion in the housing and a top surface of the head portion are formed by a flat surface. The top surface of the opening portion in the housing and the top surface of the head portion in a state in which the exhaust passage is closed are both arranged closer to an opposite side to the cavity than the molding surface.

Abstract: A tire mold has a tire molding surface. The tire molding surface is pressed against an outer surface of an uncured tire. A vent hole is provided in the tire molding surface. A surface of an outer edge region surrounding an opening of the vent hole is formed by a smooth surface. The smooth surface is smoother than a surface in a peripheral region of the outer edge region.

Abstract: A pneumatic radial tire includes three or less steel belt layers, wherein a first block and a second block extending in an outer side than the first block are alternately provided in a tire circumferential direction on a ground edge region of a tread part. An annular region extending in a circumferential direction is provided on the outer surface of an outer side than a maximum width position in a side wall part, and plural projections are provided side by side on the annular region. An outer thin wall part continuing along an outer circumferential edge of the annular region and an inner thin wall part continuing along an inner circumferential edge of the annular region are provided, and the outer thin wall part is arranged adjacent to an inner radius height and inside of the inner radius height.

Abstract: A tire mold has a tire molding surface. The tire molding surface is pressed against an outer surface of an uncured tire. A vent hole is provided in the tire molding surface. A surface of an outer edge region surrounding an opening of the vent hole is formed by a smooth surface. The smooth surface is smoother than a surface in a peripheral region of the outer edge region.

Abstract: The manufactured pieces are the ones both end surfaces thereof in the tire circumferential direction are cut from the pieces before cutting 1 and the pieces before cutting 1 have the cutting regions whose cross-sectional shapes in the tire width direction are the same at both ends of its circumferential direction. And in the cutting process of cutting the pieces for modifying the lengths in the circumferential direction from each of the pieces before cutting 1, in order that the length in the tire circumferential direction of each piece after cutting and that both of the end surfaces in the circumferential direction of the piece after cutting are included in the cutting regions, the cutting lines of each piece are set at different not less than two positions (a, a? and b, b?) in the tire circumferential direction and the pieces are cut by either one of the set cutting lines.

Abstract: A tire mold has a tire molding surface and a rough surface molding portion provided in the tire molding surface. In the rough surface molding portion, a maximum height Rz is not less than 4 ?m, a material ratio Rmr(c) in a case where 20% of the maximum height Rz is set to a cutting level c is not less than 3.5%, and a material ratio Rmr(c) in a case where 30% of the maximum height Rz is set to the cutting level c is not more than 25%.