Abstract: Starter-alternator assembly including a poly-V belt comprising a body made of elastomeric material, a plurality of filiform resistant inserts longitudinally embedded in the body, and a coupling portion integrally connected to the body and comprising a plurality of V-shaped ribs set alongside one another and alternating with V-shaped grooves. The belt has a dynamic modulus, with a tensile force pre-set at 600 N at a frequency 15 Hz, that after 10 000 cycles is higher than 110 000 N/rib/branch, and is advantageously made with resistant inserts obtained from at least one first fibre material and one second fibre material.

Abstract: Poly-V belt, particularly for driving accessories of an internal combustion engine, comprising a cord realized from a yarn composed of a plurality of filaments by means of a first twisting in which are formed at least two plied yarns each composed of at least one yarn and a second twisting in which the plied yarns are twisted together to form the cord; the first twisting and the second twisting are made in opposite directions, and the numbers of twists per meter of the two twisting steps are calculated so that in the finished cord the filaments form with the axis of the cord an angle smaller than 3.3°.

Abstract: Described herein is a toothed belt comprising a body made of elastomeric material, in which there is embedded a plurality of longitudinal filiform resistant inserts or cords, and a toothing coated with a coating fabric; on top of the coating fabric there is made to adhere a resistant layer, which increases resistance to wear of the toothed belt and comprises a fluorine-based plastomer with addition of elastomeric material, in which the plastomer is present in a larger amount than is the elastomeric material and in which the majority of the particles constituting the fluorine-based plastomer have a size less than 10 ?m. The resistant layer is applied directly on the fabric via spreading. The fluorinated plastomer preferably has a base of polytetrafluoroethylene compound.

Abstract: A pulley assembly comprising a locking assembly connected to an input shaft of a water pump, a pulley mounted in a idle condition with respect to the shaft, an armature which is axially mobile in order to selectively cooperate by friction with the pulley, an electromagnet to displace the armature arranged on the axially opposite side of the pulley with respect to the armature, and an elastic element preloaded to maintain the armature in contact against the pulley when the electromagnet is not energised and having a substantially flat shape in its non-preloaded or non-deformed configuration.

Abstract: The present invention relates to a cam actuator which adopts an epicyclic reducer housed inside the eccentric cam supporting pivot, where is also provided a housing compartment for the electrical motor, whose pinion is perfectly coaxial with the axis of the epicyclic reducer and with the axis of said supporting pivot.

Abstract: In a drive assembly for driving a pulley of a water pump of a combustion engine, a movable supporting arm is fitted idly with a drive wheel, and is loaded by a torsion spring to bring the drive wheel into angular engagement with the pulley fitted to the shaft of the pump, and with a drive belt of the engine; an actuating device (being activatable to exert a force in opposition to that exerted by the torsion spring, and detach the drive wheel from the pulley.

Abstract: A belt tensioner for a belt drive is designed to connect an engine shaft of an internal-combustion engine to a reversible electric machine which has the function of starting motor and current generator; the belt tensioner comprises a fixed part and a pair of arms, hinged on a common pin carried by the fixed part and provided with respective idle pulleys, and a spring, which forces the two arms towards one another so as to load the pulleys elastically against respective branches of the belt. The two arms of the belt tensioner are provided with respective first arrest elements, which are designed to interact with the fixed portion to define respective positions of arrest of the arms themselves under the action of the spring, and respective second arrest elements, which are designed to interact with the fixed portion to define respective positions of end-of-travel of the arms under the action of the pull of the belt.

Abstract: Belt drive assembly for driving accessory parts of an internal combustion engine comprising a reversible electric machine, comprising a belt with a plurality of longitudinal ribs alternating with grooves and with a plurality of cavities spaced at equal distances from each other longitudinally and obtained transversely with respect to the ribs in such a way as to interrupt them; the pulley comprises a plurality of ribs suited to engage the grooves of the belt and a plurality of teeth transverse with respect to the ribs, spaced at equal distances from each other on the circumference and suited to engage the respective cavities of the belt. The cavities of the belt have a depth at the most equal to the height of the ribs of the belt itself, and the ribs of the pulley have a radial height larger than the teeth, so as to cooperate with the belt continuously along the whole winding arc.

Abstract: A pulley for a continuously variable transmission is provided with a fixed half-pulley fitted on a supporting shaft and a mobile half-pulley, which is able to slide towards the fixed half-pulley under the thrust of a spring, so as to define a V-shaped race of variable amplitude. The pulley is further provided with a device for compensating the axial thrust, said device being constituted by a cam and a cam follower, which are coupled in contact with one another to impart an additional axial thrust on the mobile half-pulley in response to a torque acting on the pulley. The cam is defined by a tubular body made of plastic material co-moulded on the supporting shaft, whilst the cam follower is made of a single piece with the mobile half-pulley.

Abstract: A tensioner for a belt drive, comprising: a base carrying a pin defining an axis; a tensioning arm, which can rotate about the pin and supports an idle pulley; and a damping element, which is constrained to a hinge point eccentric with respect to the axis and is carried by one between the base and the tensioning arm so as to co-operate with a friction surface carried by the other between the base and the tensioning arm. The belt tensioner further comprises a resilient element having a first end portion connected in a single point to the damping element and a second end portion connected to the other between the base and the tensioning arm to cause a rotation of the damping element about the hinge point against the friction surface.

Abstract: Toothed belt for use in contact with oil and comprising a body and a number of teeth extending from at least one surface of the body; the teeth are coated by a fabric; a resistant layer comprising a plastomer based on fluorine with the addition of elastomeric material, in which the plastomer is present in a larger quantity than the elastomeric material, is applied by adhesion onto the coating fabric. The elastomeric material forming the body of the belt is a copolymer obtained from a dienic monomer and a monomer containing nitrile groups, in which the nitrile groups are between 33% and 49%, preferably 39%, in weight with respect to the copolymer.

Abstract: A drive for an internal combustion engine having a predetermined take-up rate (TU) and comprising a drive pulley, a driven pulley, a shoe and an oil wet toothed belt cooperating in contact with a guiding surface of the shoe, presenting an optimised winding angle (?) of the guiding surface to decrease the power dissipated on the toothed belt.

Abstract: A hub-pulley assembly comprising a hub adapted to be connected to a rotational member of a motor vehicle and having an axis, a pulley adapted to cooperate with a drive belt and driving means arranged between the hub and the pulley. The driving means comprise bidirectional disengagement means which allow a relative rotation between the hub and the pulley in both directions.

Abstract: Tensioner for a belt drive, including a rigid element rotatably connected around a first axis and a couple of idle pulleys supported by a rigid element on opposing parts of axis and adapted to cooperate with respective sections of a belt of belt drive. The tensioner also includes a mobile element hinged to a second fixed axis carrying the first axis.

Abstract: A pulley assembly for a continuously variable transmission in a vehicle, comprising a shaft having an axis, a supporting element rotatable about said axis, a first half pulley rigidly and rotationally connected to said supporting element, a second half pulley facing said first half pulley for defining a seat adapted to accommodate a belt of the transmission, at least one of the first and second half pulleys being longitudinally mobile with respect to the supporting element, and a clutch comprising a second supporting element connected to the shaft, a drum connected to the supporting element and accommodating the second supporting element, and a plurality of friction elements hinged to the second supporting element about respective hinge axes to selectively cooperate with the drum. In particular, the respective centres of gravity of said friction elements are located before the respective hinge axes with respect to a direction of rotation of the shaft which defines a forward running condition of the vehicle.

Abstract: A shoe tensioner for a synchronous belt drive, having a guide member adapted to cooperate with a drive belt and hinged at one end about a first axis; elastic means cooperating with the guide member to tension the belt; and connecting means for connecting the tensioner to a supporting wall. More specifically, the elastic means include a coil spring.

Abstract: A pulley assembly (1) comprising a hub (2) with an axis (A) and adapted to be rigidly connected to a rotating shaft (3) of an engine assembly, a turning annular pulley (10) of ferromagnetic material supported at least indirectly on the hub (2), a ring (9) of electrically conducting material rotationally connected to the hub (2), and at least a pair of magnets (16, 17) rigidly connected to the pulley (10) and facing the ring (9). The pulley (10) defines a cavity (11) accomodating said ring (9).

Abstract: A continuous variable transmission belt, comprising an annular continuous band comprising a body reinforced by a longitudinal armature and a plurality of friction plugs connected by coupling of shape with at least one of either an outer spine of the continuous band or an inner surface opposite to the outer spine with respect to the armature, the friction plugs comprising respectively a friction member adapted to cooperate with a pulley of the transmission and a connection member cooperating with the friction member to rigidly connect the friction plug to the continuous band. Each of the connecting members is made of a material having a higher thermal conductivity than that of the friction members and presents an abutting surface against either of the outer spine or the inner surface.

Abstract: Actuator adapted to cooperate with a drive of an endothermic engine including power source and a releasable accessory, the actuator including a box-shaped casing, a motorized eccentric group housed inside the casing and including a reduction gearing, an arm cooperating with the eccentric group and supporting a friction wheel adapted to cooperate with the accessory and with the power source, the arm being mobile between an engaged position and a disengaged position of the accessory.

Abstract: In a belt drive of an internal combustion engine, a two-arm belt tensioner has a fixed tubular supporting portion; a first and a second arm fitted to the tubular supporting portion to rotate about a common hinge axis, and supporting respective idle wheels cooperating with respective branches of the drive belt; and an elastic device for forcing the arms towards each other; the elastic device having a torsionally elastic elongated member extending through the tubular supporting portion, coaxially with the hinge axis, and having respective opposite end portions projecting outwards of the tubular supporting portion; the end portions being fitted with respective end caps, one of which is fitted directly with one of the arms, and houses one end, connected integrally to the other cap, of the other arm.