Abstract: A turbocompound internal combustion engine having a turbocharger with a variable-geometry turbine; and an auxiliary turbine, which is located downstream from the turbine of the turbocharger, provides for recovering energy from the exhaust gas, and is connected mechanically to the drive shaft of the engine via a transmission; a control device compares the rotation speed of the auxiliary turbine, detected by means of a sensor, with a range of permissible speeds calculated on the basis of the speed of the drive shaft, and controls fuel supply to the engine and the geometry of the variable-geometry turbine to maintain the speed of the auxiliary turbine within predetermined limits in the event of a fault on the transmission.

Abstract: An internal combustion engine provided with a decompression-type braking system and with a turbocharger having a variable geometry turbine, in which the effective flow section of the gases entering the turbine under the maximum braking power condition is maintained at least equal to a safety limit value calculated on the basis of geometrical characteristics and of limit values of operating parameters of the engine and of the turbocharger for the purpose of achieving the maximum braking power compatible with the safety of the engine and of the turbocharger.

Abstract: A chain transmission device for controlling the timing system of an internal combustion engine with two overhead camshafts, and having a first chain transmission from the drive shaft to an intermediate shaft, and a second chain transmission from the intermediate shaft to both the camshafts; and wherein the first transmission defines a step-down transmission ratio between the drive shaft and the intermediate shaft; the second transmission defines a step-down transmission ratio between the intermediate shaft and the camshafts; the chain of the second transmission has a pitch smaller than the pitch of the chain of the first transmission; and the intermediate shaft is defined by the drive shaft of a fuel pump of the engine.

Abstract: A method of producing hollow front axles industrial vehicles including the steps of fluoforming a tubular blank to obtain an intermediate product having reduced-diameter ends, crushing the intermediate product to obtain a central portion of elongated section and bent intermediate portions, and finishing the axle by hydroforming.

Abstract: An internal-combustion engine, in particular for a vehicle, is provided with a plurality of cylinders and a cylinder head which defines, for each cylinder, at least one exhaust duct and at least one intake duct; the engine is further provided with an exhaust manifold communicating with the exhaust ducts, and a system for recirculating exhaust gas from the exhaust manifold to the intake ducts; the system comprises a further manifold which distributes the recirculated exhaust gases to the intake ducts and communicates with the exhaust manifold through a recirculation duct provided at least partly directly in the cylinder head which is provided with a heat exchanger for cooling the recirculated exhaust gases.

Abstract: An induction manifold for an internal-combustion engine, comprising an elongate main body having longitudinal inner cavity provided with an opening adapted to communicate with the intake orifices of the engine, an inlet duct provided with an air-inlet opening and communicating with the cavity, a feed duct for EGR gases formed integrally with the manifold and comprising a first portion extending inside the main body from an inlet orifice for EGR gases to the air-inlet duct and from a second portion extending inside the inlet duct and provided with an outlet opening in the inlet duct itself, and a baffle disposed in the inlet duct between the air-inlet opening and the outlet opening of the feed duct for directing the air and the EGR gases towards a mixing zone inside the inlet duct and situated at a predetermined distance from the cavity of the main body.

Abstract: An automated gear change for an automobile vehicle, in particular for an industrial vehicle, provided with an input shaft, an output shaft, a geared transmission interposed between these input and output shafts and including an auxiliary shaft and a plurality of gears mounted in an angularly idle manner with respect to this output shaft and a plurality of engagement members for each gear that can be selectively actuated in order to make this gear angularly rigid with the output shaft; each engagement member is mounted to slide in a respective pair of seats that face one another and communicate and are associated with the relative gear and, respectively, with the output shaft, and can move between a first disengaged operating position in which it exclusively engages one of the seats and a second engaged operating position in which it engages both the seats; the gear change is further provided with actuation means of electromagnetic type in order to control the displacement of each engagement member between the

Abstract: A gear change for a commercial vehicle comprising a main group defining a plurality of transmission ratios and an auxiliary group with two transmission ratios actuated by an actuator with three positions corresponding respectively to two coupling positions and one neutral position; the actuator is controlled by a control unit in response to actuating signals received by manual selectors, and it is adapted to place the auxiliary group in the neutral position if the speed of rotation of the input shaft exceeds a predetermined threshold value.

Abstract: A gear change for an automobile vehicle comprising a box, a main train, an input shaft of which is connected to the engine and a primary shaft of which can be connected angularly to the input shaft by a plurality of pairs of gears, and an auxiliary epicyclic gear train comprising, in turn, a sun gear angularly coupled to the primary shaft, a train carrier angularly rigid with an output shaft of the gear change and comprising a plurality of planet gears engaging with the sun gear, and an outer crown having inner teeth engaging with the planet gears, which crown can be displaced along the longitudinal axis between a first operating position in which it is coupled to the box by the engagement of a first and a second toothed wheel and a second operating position in which it is coupled to the train carrier by the engagement of a third and a fourth toothed wheel; the sun gear, the planet gears and the inner teeth of the crown comprising respective helical teeth and the first, second, third and fourth toothed wheels

Abstract: A purifier device for a bleed circuit of a block of an internal combustion engine provided with a filter member acting by coalescence adapted to be traversed by a flow of gases from the interior of the block and containing oil and particulates in suspension; the filter member has an absolute retaining power such as to allow the passage of the particulates so that they are incorporated on the particles of oil agglomerated by coalescence within the filter member and are removed with this oil without the risk of the filter member becoming clogged up.

Abstract: A gear change for an automobile vehicle comprising an outer box, an input shaft and a driven shaft coaxial with one another, and at least one countershaft that can be angularly coupled with the input shaft and with the driven shaft by means of a plurality of pairs of gears in order to define a plurality of transmission ratios between the input shaft and the driven shaft; the input shaft and the driven shaft are borne via bearings by respective walls of the box in the vicinity of respective first end portions opposite one another and comprise respective second portions mounted one inside the other and mutually supporting one another via a pair of axially spaced bearings.

Abstract: An endothermal engine provided with a device for purifying the blow-by gases of the block, comprising a housing provided with an inlet opening communicating with the interior of the block of the engine and an outlet opening for the purified gases and integrally defining an impact separator for the removal of the larger oil particles and a filter member for the separation of the residual oil and particulates housed in a chamber of the housing; the device forms a compact integrated unit which may be readily mounted on the engine.

Abstract: A method of controlling a power unit of a vehicle, comprising a stage of calculating the theoretical increment/decrement (Ge, Gd) in the gear number required to pass from the actual operating condition of the vehicle to a condition of maximum power and, respectively, of maximum economy, and a stage of calculating the increment/decrement in the gear number required to obtain the optimum gear by means of an average of the theoretical increments/decrements (Ge, Gd) weighted with weighting factors (Ke, Kd) calculated on the basis of operating parameters of the vehicle detected by means of onboard sensors.

Abstract: A load of plastic material is formed from two sheets cut successively from a roll of strip material. The first sheet is cut to a roughly constant length, weighed and loaded on to a conveyor. The second sheet is cut to the length calculated according to the weight of the first sheet and is loaded on to the conveyor in a predetermined position in relation to the first sheet. Each sheet is positioned by transferring it from the cutting station to a transfer structure moved in relation to a stop structure set each time to a given programmed position.

Abstract: Electronic control system for a variable geometry turbocompressor applied to a diesel engine provided with a continuous braking device. The system is provided with a selector which may be manually actuated and by of which it is possible to control the engagement/disengagement of the continuous braking device and it is possible to select a first braking mode according to which the speed of the engine is maintained substantially constant by controlling the turbocompressor and a second braking method in which the continuous braking device provides the maximum braking power.

Abstract: An electronic control system for a variable geometry turbocompressor applied to a diesel engine, in which a first circuit produces, in response to input signals, a first closed-loop piloting signal supplied to an actuator which modifies the geometrical characteristics of the turbocompressor. The system further comprises a second circuit which receives as input a measurement signal proportional to the speed of rotation of the turbocompressor and generates a second piloting signal which is supplied to the actuator when the measurement signal exceeds a stored limit value.

Abstract: A gear change for an industrial vehicle, provided with an integrated control unit housed in a seat of the gear box and comprising a plurality of actuators for controlling the selection and coupling of the gears, a plurality of electrovalves for the actuation of the actuators and a sensor of the angular speed of an input shaft of the gear change.

Abstract: A load of plastic material, including two sheets cut successively from a strip, is loaded into the mold of a molding press by way of a loading device including a conveyor having a number of spaced, parallel belts; a number of lifting elements arranged in rows between the belts; and a number of retractable bars insertable between the lifting elements for picking up the load. By way of an operating arm, the bars are moved up to the mold and then withdrawn in relation to a stop cross member so as to drop the load inside the mold.

Abstract: For molding complex mechanical components from plastic material in sheets, any portions of the material projecting from the mold are folded about the respective edges of the mold. The sheets are transferred to the mold on a number of retractable bars moving in relation to at least one reference bar; and a finger is moved towards the mold by an articulated parallelogram mechanism, and is mounted on a supporting bar located between two adjacent retractable bars and adjustable for so orienting the finger as to fold the projecting portion of sheet material in either one of two opposite directions.

Abstract: A gear change for a vehicle comprising an external box made from an aluminum alloy, a main group, a driving shaft of which is adapted to be driven by an engine of the vehicle and a driven shaft of which may be drivingly connected with the driving shaft via a plurality of pairs of gears defining different transmission ratios, and an auxiliary epicyclic group connected in cascade with the main group in which the driven shaft is loaded axially by an elastic member which maintains it in contact with an axial abutment elements to ensure its correct axial positioning upon variations in play due to differential thermal expansion with respect to the box.