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 which shapes a sidewall of a tire. 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 closed in a tire circumferential direction and a tire radial direction and is opened to a side shaping surface, at spaced intervals in the tire circumferential direction. Each of the pieces is fitted into the recess and forms the side shaping surface with the side mold main body.

A front surface of a stencil plate to be mounted on a mounting groove of a tire vulcanizing mold is provided with: a first recess for forming a protruding identification mark on an outer surface of a tire; and a second recess on which a screw having a flat head bottom surface is disposed, the second recess being formed on a periphery of a through hole. A back surface of the stencil plate is provided with: a first protrusion corresponding to the first recess and protruding toward a groove bottom surface; and a second protrusion corresponding to the second recess and having a flat surface capable of being brought into surface contact with the groove bottom surface. When a protrusion amount of the first protrusion is H1 (mm), and a protrusion amount of the second protrusion is H2 (mm), 0H2H1 is satisfied.

A tire vulcanizing mold comprises a sidewall ring for molding a sidewall portion of a tire. The sidewall ring is composed of a main body provided with a circumferentially extending groove, and mold pieces mounted in the groove so as to be adjacent to each other in the circumferential direction. Between the mold pieces and/or between the main body and the mold pieces, there are formed micro-gaps for discharging gas existing in the tire vulcanizing mold so as to communicate with exhaust flow paths extending from the groove toward the outside of the mold.

A 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 including plural recesses, each being opened to corresponding one of the side shaping surfaces at spaced intervals; plural pieces, each of which is fitted into the recess; and clearances provided between the side mold main body and each of the pieces. Each of the recesses includes: an outer-side inner wall surface defining an outer side in a tire radial direction; an inner-side inner wall surface defining an inner side; a pair of radial inner wall surfaces that are located between the outer-side inner wall surface and the inner-side inner wall surface and define one side and the other side in the tire circumferential direction; and a curved surface that connects the outer-side inner wall surface and the radial inner wall surface.

A vulcanising device of a vehicle tyre includes a lower plate, on which segments shoes are fitted, on which segment shoes profile segments are arrangeable in order to form a tread pattern in the tyre blank to be vulcanised, and a closure ring for moving the segment shoes in the radial direction of the closure ring, which is placed around the segment shoes against the back surfaces of the segment shoes. The closure ring includes wear plates, which are coated with a ceramic coating layer, which wear plates are arranged on the inner surface of the closure ring so that the ceramic coating layers are fitted against the back surfaces of the segment shoes, and/or the lower plate includes wear plates, which are coated with a ceramic coating layer, which wear plates are arranged on the surface of the lower plate so that the ceramic coating layers are fitted against the lower surfaces of the segment shoes.

A tire vulcanization mold 10 of an embodiment includes a side mold 14 having a side molding surface 20 for molding a side wall portion. The side mold 14 includes: a side mold body 24 having a plurality of recesses 30 provided at intervals in a tire circumferential direction; a plurality of side pieces 26 fitted into the recesses 30 and forming an annular side molding surface 20 together with the side mold body 24; and a plurality of vent gaps 28 provided between side surfaces 26A on both sides in the tire circumferential direction of the side pieces 26 and wall surfaces 30A of the recesses 30. An inner end 26E in a tire radial direction of the side piece 26 is positioned inwardly in the tire radial direction from an inner end 20E in the tire radial direction of the side molding surface 20.

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.

In manufacturing a pneumatic tire, a replaceable member having a smooth flat surface is attached to a mold body of a tire mold configured to vulcanize an unvulcanized tire into a predetermined shape by contact with the unvulcanized tire. A mold inner surface that forms the shape of a tire side surface portion includes a curved surface of the mold body and the flat surface surrounded by the curved surface. A vulcanized tire is produced by vulcanizing the unvulcanized tire by bringing the unvulcanized tire into contact with the mold inner surface. A two-dimensional code is engraved in a planar surface region of the vulcanized tire, which corresponds to the flat surface. In the two-dimensional code, a dot pattern is formed by two types of gray scale elements that are formed identifiable from each other by surface unevenness.

A mechanism releases a plate from a recess in a tire mold part. The mechanism includes a bolt insertable into a hole in the tire mold part and extending from a first end at an outer surface of the tire mold part to a second end at a recess for a pocket plate in the tire mold part. The first end of the bolt has an axially extending projection allowing manipulation of the bolt about an axis within the hole. The projection is defined by two diametrically opposite curved surfaces interconnected by two diametrically opposite planar surfaces.

A tire vulcanization mold 10 of an embodiment includes an annular side mold 14 having a side molding surface 18 for molding a side wall portion T2. In a side mold body 15 of the side mold 14, an annular recess 20 is provided in the side molding surface 18 and a side ring 22 is fitted into the annular recess. The side ring 22 is mounted in the annular recess 20 such that a vent gap 30 for discharging air is formed between the side ring and the annular recess, on an opening portion side of the annular recess 20, and such that the side ring 22 is centered with respect to the side mold body 15 by a close contact fitting portion 28 in which the side ring and the annular recess are fitted without a gap therebetween, on a bottom portion side of the annular recess 20.