Abstract: A method for building tyres is described. An elementary semifinished product is deposited on a building drum rotated by an output end effector of a robotized arm in form of coils forming a component of a tyre. A processor determines a target rotation speed of the building drum and a target value for a speed parameter associated with the rotation. If the target value is not an integer number, the processor: i) determines a drive interval shorter than the effector settling time; ii) calculates first and second values corresponding to integer numbers immediately preceding and immediately following the target value; iii) calculates a speed parameter PWM profile with minimum and maximum values corresponding to the first and second values; and iv) controls the effector according to the PWM profile.

Abstract: The present invention relates to an apparatus and to a process for building tyres for vehicle wheels, wherein sidewalls (11) are applied on opposite sides of a carcass sleeve (12) placed on a shaping drum (13). The application of the sidewalls (11) comprises: arranging each sidewall (11) as a ring around application levers (24) of a respective support (18), making an axial appendage (35) of the sidewall (11) protrude axially beyond the free ends (25) of the respective application levers (24); radially opening the free ends (25) of the application levers (24) of each support (18) so as to make the respective sidewall (11) radially expand; axially approaching the free ends (25) of the application levers (24) to the respective half-drum (17) up to engaging the axial appendage (35) with the carcass sleeve (12) and radially opening the free ends (25) of the application levers (24) to adhere the sidewalls against the carcass sleeve (12).

Abstract: The present disclosure is directed to a process and an apparatus for cutting a continuous rubber-covered belt in a process for building tyres for vehicle wheels, wherein the apparatus comprises a cutting group, in turn comprising: a knife formed by a first half-part and a second half-part and movable along a cutting direction that is tilted with respect to a supply direction of a rubber-covered belt placed beneath the knife. The process comprises: lifting a lifting element placed below the continuous rubber-covered belt and at the cutting zone, until a portion of rubber-covered belt is lifted, and lowering the single first-half part of the knife, making it slide with respect to the second half-part.

Abstract: The present invention relates to elastomeric compositions and compounds for tyres, in particular for tyre treads, comprising elastomeric polymers in specific ratios and having particular Tg values, tyre components and tyres for vehicle wheels which comprise them. These compounds find particular application in all-season tyres as they give them good manoeuvrability on snow, grip in the wet and advantageously limited wear of the tread.

Abstract: A continuous elongated element of elastomeric material is produced through an extruder at a linear delivery speed and directly fed onto a moving surface of a conveyor without interposition of other devices. The continuous elongated element is advanced on the moving surface along a predetermined direction and at a linear advancing speed different from the linear delivery speed until a proximal end of the conveyor. Subsequently, the continuous elongated element is applied onto a forming support which rotates relative to the proximal end of the conveyor at a peripheral speed different from the linear delivery speed, so as to deform the continuous elongated element and apply it in the form of wound coils onto the forming support in order to form a component of elastomeric material of a tyre.

Abstract: In a shaping station (13), a toroidal forming drum (23) is positioned within a carcass sleeve (12) comprising at least one carcass ply (3) associated with a pair of beads (6) in radially inner position. The carcass sleeve (12) is toroidally shaped by radial expansion of the forming drum (23). The forming drum (23) carrying the shaped carcass sleeve (12) is removed from the shaping station (13). Tyre components (7, 8, 9) are applied externally on the shaped carcass sleeve (12), carried by the forming drum (23). At the end of the shaping and during the application of the tyre components (7, 8, 9), axially inner sides of said beads (6) are arranged axially against respective circumferential axially outer portions (S1) of an abutment surface (S) carried by the expanded forming drum (23), having shape corresponding to an inner shape of the shaped carcass sleeve (12).

Abstract: Tyre (1) comprising a monitoring device (10) comprising an electronic unit (11) comprising a sensor for detecting at least one of the following physical quantities: temperature, pressure, acceleration, deformation; a processing unit; a transceiver; an electric power supplier (12) having a housing body (50), a first pole (22) and a second pole (24); an electric circuit (18) for connecting the two poles (22, 24) to the electronic unit (11); a flexible support (13) on which the electronic unit is fixed (11), wherein the housing body (50) is fixed onto the flexible support (13) at a first face (23), wherein the monitoring device (10) comprises a tab (26) integral with the flexible support (13) and folded so that a portion (27) of the tab is fixed to a second face (25) of the housing body (50), and wherein the electric circuit (18) comprises a connecting track (28) extending along the tab (26) up to electrically contact the second pole (24).

Abstract: Tyre for vehicle wheels, comprising a tread band comprising circumferential grooves, circumferential ribs defined by said circumferential grooves and a plurality of sipes (10) that extend, on said circumferential ribs, from a radially outer surface of the tread band towards a radially inner portion of the tread band. Said sipes (10) extend along a predetermined trajectory and comprise, in any cross section perpendicular to said predetermined trajectory, a main portion (100) having a first radial dimension (H?) and a first transversal dimension (T, T?) substantially constant along a radial direction and, in a radially outer position with respect to said main portion (100), a top portion (110) extending up to said radially outer surface of the tread band and having, at said radially outer surface of the tread band, a second transversal dimension (W) greater than said first transversal dimension (T, T?).

Abstract: The present invention relates to compositions for elastomeric compounds for tyres, in particular for tyre treads, comprising particular reversible cross-linking agents, tyre components and tyres for vehicle wheels which comprise them. The present elastomeric compounds, due to their particular hysteretic behaviour, allow manufacturing tyres characterised by a lower rolling resistance during moderate driving and at the same time greater resistance to tearing and road grip during sports driving.

Abstract: Method (200), and related system (100), for monitoring a status of a tyre (99) fitted on a vehicle, the method comprising: -with the vehicle in motion and the tyre (99) in rotation, acquiring (3, 6) a motion signal representative of a motion of a crown portion (31) of the tyre (99), wherein the motion signal temporally corresponds to a plurality of turns of the tyre (99); -filtering (15, 42) from the motion signal a part of the motion signal temporally corresponding at least to each passage of the crown portion (31) in a footprint area of the tyre (99), for obtaining a filtered motion signal; -obtaining (4, 7) a frequency spectrum of the filtered motion signal; -determining (11) the status of the tyre (99) based on the frequency spectrum.

Abstract: The present invention relates to a self-supporting tyre (100) for motor vehicles which comprises sidewall reinforcing inserts (113A, 113B) with different stiffness. In particular, the sidewall reinforcing insert on the side of the tyre most stressed during driving is less rigid than the sidewall reinforcing insert on the less stressed side. The tyre of the invention exhibits a reduced rolling resistance and better comfort in normal driving and an unexpected increase in mileage in run-flat driving.

Abstract: Methods for controlling curing apparatuses for tyre production, wherein the curing apparatuses are adapted to work on green tyres to obtain corresponding finished tyres by acquiring, through a processing unit, initial parameters describing at least one of the shape and dimensions of the finished tyres. The processing unit computes first parameters describing the green tyres, the first parameters having at least one parameter representative of an axial height of the green tyres; second parameters describing the curing apparatuses, the second parameters having one or more parameters representative of dimensions of the curing apparatuses; and third parameters as a function of the first parameters and the second parameters, the third parameters having one or more parameters representative of positions taken by movable members included in the curing apparatuses. The processing unit generates signals for controlling the movable members of the curing apparatuses.

Abstract: A tyre (100) for vehicle wheels is described comprising at least one structural element comprising a vulcanized elastomeric material obtained by vulcanizing a vulcanizable elastomeric composition comprising a predispersion of an elastomeric diene polymer and lignin obtained by a process comprising: a) providing in a dispersant liquid a first lignin suspension having a value of a median particle diameter D50 equal to or less than 10 microns; b) providing a second suspension comprising lignin and elastomeric diene polymer latex by mixing the first lignin suspension obtained from step a) with the latex; and c) removing the dispersant liquid from the second suspension comprising lignin and elastomeric diene polymer latex.

Abstract: A method and a related station for applying a sensing device to a tyre are described. A tape-shaped support with removably fixed sensing devices is advanced, to feed the sensing devices in sequence. A handling device is then rigidly coupled to a sensing device, maintaining at least a portion of an adhesion surface of the sensing device removably fixed to a support. The sensing device is then completely separated from the support, taken away by the handling device, and applied to an inner surface of a tyre by the handling device.

Abstract: A method for checking tyres, includes: arranging a tyre in a station for checking tyres; moving a sensor within the tyre; performing first checks on an inner surface of the tyre with the at least one sensor; engaging a radially outer portion of the tyre with grip elements of an overturning device; extracting the sensor from the tyre and spacing the sensor from the tyre; overturning the tyre by 180° by rotation of the grip elements; moving again the sensor within the tyre; performing second checks on the inner surface of the tyre with the sensor; extracting again the sensor from the tyre and spacing the sensor from the tyre; and transporting the tyre outside the station for checking tyres.