摘要:
A green tire is built on a rigid toroidal support externally having a forming surface of a conformation corresponding to an inner conformation of the tire. The built tire is removed from the rigid toroidal support and engaged on an expandable toroidal support which includes a bladder. The green tire engaged on the expandable toroidal support is introduced into a vulcanization mold and submitted to a vulcanization cycle.
摘要:
A green tyre is built on a rigid toroidal support externally having a forming surface of a conformation corresponding to an inner conformation of the tyre. The built tyre is removed from the rigid toroidal support and engaged on an expandable toroidal support which includes a bladder. The green tyre engaged on the expandable toroidal support is introduced into a vulcanisation mould and submitted to a vulcanisation cycle.
摘要:
A green tire disposed on a toroidal support is introduced into a vulcanization mold. The mold is closed through axial approaching of a pair of sidewall plates acting against the sidewalls of the tire. Circumferential sectors set to operate against the tire tread band are maintained spaced apart from the tread band itself during admission of a working fluid designed to press the tire against the toroidal support. Subsequently, the sectors are centripetally approached for penetration into the tread band concurrently with a step of full molding and vulcanization of the tire carried out through admission of steam under pressure into the tire itself.
摘要:
A green tyre disposed on a toroidal support is introduced into a vulcanisation mould. The mould is closed through axial approaching of a pair of sidewall plates acting against the sidewalls of the tyre. Circumferential sectors set to operate against the tyre tread band are maintained spaced apart from the tread band itself during admission of a working fluid designed to press the tyre against the toroidal support. Subsequently, the sectors are centripetally approached for penetration into the tread band concurrently with a step of full moulding and vulcanisation of the tyre carried out through admission of steam under pressure into the tyre itself.
摘要:
A green tire disposed on a toroidal support is introduced into a vulcanisation mold. The mold is closed through axial approaching of a pair of sidewall plates acting against the sidewalls of the tire. Circumferential sectors set to operate against the tire tread band are maintained spaced apart from the tread band itself during admission of a working fluid designed to press the tire against the toroidal support. Subsequently, the sectors are centripetally approached for penetration into the tread band concurrently with a step of full molding and vulcanisation of the tire carried out through admission of steam under pressure into the tire itself.
摘要:
A green tyre disposed on a toroidal support is introduced into a vulcanisation mould. The mould is closed through axial approaching of a pair of half shells acting against the sidewalls and the tread band of the tyre. Circumferential sectors set to operate against the tyre tread band are maintained spaced apart from the tread band itself during admission of a working fluid designed to press the tyre against the toroidal support. Subsequently the sectors are centripetally approached to cause penetration of forming ridges movable in through slits into the tread band, concurrently with a step of full moulding and vulcanisation of the tyre carried out through admission of steam under pressure into the tyre itself.
摘要:
A pneumatic tyre for a two-wheeled vehicle includes a carcass structure, belt structure, tread band, and pair of sidewalls. The carcass structure includes at least one first and second carcass ply. Each carcass ply includes cords disposed substantially parallel to each other. Ends of each carcass ply are engaged with respective circumferential annular reinforcing structures. Each carcass ply cord identifies a radial plane of the tyre passing through an intersection point of the cord with an equatorial plane of the tyre and lies in a plane substantially perpendicular to the equatorial plane and forming a lying angle different from zero with a respective radial plane. The lying angle of each cord of the at least one first carcass ply and the lying angle of a corresponding cord of the at least one second carcass ply identifying a same radial plane have opposite signs with respect to that radial plane.
摘要:
A green tyre disposed on a toroidal support is introduced into a vulcanisation mould. The mould is closed through axial approaching of a pair of sidewall plates acting against the sidewalls of the tyre. Circumferential sectors set to operate against the tyre tread band are maintained spaced apart from the tread band itself during admission of a working fluid designed to press the tyre against the toroidal support. Subsequently, the sectors are centripetally approached for penetration into the tread band concurrently with a step of full moulding and vulcanisation of the tyre carried out through admission of steam under pressure into the tyre itself.
摘要:
A process and a tyre manufacturing line for producing tyres, wherein the process includes the steps of: i) transferring a first toroidal support to a first assembling apparatus; ii) in the first assembling apparatus, sequentially building on the first toroidal support a first toroidal carcass ply and a first pair of annular reinforcing inserts so as to associate each annular reinforcing insert with a respective radially internal edge of the first toroidal carcass ply; iii) transferring the first toroidal support to a second assembling apparatus; iv) in the second assembling apparatus, sequentially building on the first toroidal support, carrying the first toroidal carcass ply associated with the first pair of annular reinforcing inserts, a second toroidal carcass ply and a second pair of annular reinforcing inserts so as to associate each annular reinforcing insert with a respective radially internal edge of the second toroidal carcass ply.
摘要:
A belt structure for a two-wheeled vehicle made by means of strip-like segments or elements, each including parallel cords embedded in an elastomeric layer, sequentially laid along the circumferential extension of a toroidal support so as to form a reinforcing layer having a continuous circumferential extension around a geometric rotation axis of the toroidal support, wherein each strip-like element is laid in a laying trajectory defining, at each point, a laying angle; at each point of the laying trajectory a laying gap is formed between adjacent strip-like elements; the laying trajectory is formed starting from preselected laying angles on the shoulder and on the crown of the tyre; the laying gap between adjacent strip-like elements varies along at least one length of said laying trajectory between crown and shoulder so as to cause variation of the laying angle and obtain the preselected angles on the shoulder and on the crown.