The heat exchanger comprises a first and a second stage (E1,E2), each having an inlet and an outlet of water, the second stage (E2) having an inlet and an outlet of oil, the first stage (E1) being provided with fuel inlet and outlet nozzles, selectively connected, in parallel, to the fuel supply to the engine (M). The inlet and outlet of water of the first stage (E1) are respectively connected to the outlet of the water radiator, by means of a cooling water circuit internal to the engine (M), and to the water inlet of the second stage (E2). The water outlet of the second stage (E2) is connected to the inlet of a water radiator, and the inlet and outlet of oil in the second stage (E2) are connected in series to a lubricant oil circuit internal to the engine (M).

The heat exchanger (HE) has a first stage and a second stage (E1, E2) which are seated and affixed in a connecting block seated and affixed to the engine (M). The first stage (E1) is provided with a fuel inlet nozzle and a fuel outlet nozzle which are connected to the supply of fuel to the engine (M), and the connecting block defines: a return conduit, communicating an outlet of a cooling water circuit of the engine (M) with a water inlet in the first stage (E1); an interconnecting conduit communicating a water outlet of the first stage (E1) with a water inlet of the second stage (E2); an outlet conduit communicating a water outlet of the second stage (E2) with an inlet of a water radiator having an outlet; and two oil conduits, communicating a lubricant oil circuit of the engine (M) with the second stage (E2).

The internal combustion engines (M) of the invention are provided with a cooling water circuit, associated with a water radiator and with a lubricant oil circuit. The heat exchanger (HE) comprises an inlet and an outlet of water connected, in series, to an outlet of the water radiator, by means of a cooled water conduit and of the cooling water circuit, and to an inlet of the water radiator, by means of a return conduit and a hot water conduit; a fuel inlet nozzle and a fuel outlet nozzle, selectively connected to the fuel supply to the engine (M); and an inlet and an outlet of lubricant oil, connected to the lubricant oil circuit by means of respective oil conduits.

A preheating device for preheating the fuel of an internal combustion engine with a heating medium has a fuel transport device with a fuel inlet and a fuel outlet, and has a fuel transport channel connecting the fuel inlet and the fuel outlet. The preheating device also has a heating medium transport device with a heating medium inlet and a heating medium outlet, as well as a heating medium transport channel connecting the heating medium inlet and the heating medium outlet and/or at least one heating element. The fuel transport device and the heating medium transport device and/or the at least one heating element are in thermal contact with each other and thus form a heat exchanger via which a fuel transported in the fuel transport device can be heated by a heating medium transported in the heating medium transport device and/or by the at least one heating element.

A method to manufacture a throttle valve for an internal combustion engine comprising a valve body having a seat and a tube for the passage of conditioning fluid; an actuating device, which controls the rotation of a throttle plate; and a substantially uniform layer of a structural and heat-conducting resin interposed between the seat and the tube and applied on the entire available surface of the seat; the method comprising the steps of manufacturing the valve body provided with the seat by causing a first metal material to undergo a die casting process; applying a trace of the structural and thermosetting resin on the bottom of the seat; and inserting the tube into the seat so as to obtain a substantially uniform layer of the structural and thermosetting resin, which is interposed between the seat and the tube.

A preheating device for preheating the fuel of an internal combustion engine with a heating medium has a fuel transport device with a fuel inlet and a fuel outlet, and has a fuel transport channel connecting the fuel inlet and the fuel outlet. The preheating device also has a heating medium transport device with a heating medium inlet and a heating medium outlet, as well as a heating medium transport channel connecting the heating medium inlet and the heating medium outlet and/or at least one heating element. The fuel transport device and the heating medium transport device and/or the at least one heating element are in thermal contact with each other and thus form a heat exchanger via which a fuel transported in the fuel transport device can be heated by a heating medium transported in the heating medium transport device and/or by the at least one heating element.

A method to manufacture a throttle valve for an internal combustion engine comprising a valve body having a seat and a tube for the passage of conditioning fluid; an actuating device, which controls the rotation of a throttle plate; and a substantially uniform layer of a structural and heat-conducting resin interposed between the seat and the tube and applied on the entire available surface of the seat; the method comprising the steps of manufacturing the valve body provided with the seat by causing a first metal material to undergo a die casting process; applying a trace of the structural and thermosetting resin on the bottom of the seat; and inserting the tube into the seat so as to obtain a substantially uniform layer of the structural and thermosetting resin, which is interposed between the seat and the tube.

A throttle valve for an internal combustion engine provided with a valve body, a tubular feeding duct defined in the valve body, a throttle plate, and an actuating device which controls rotation of the throttle plate. The actuating device includes an electric motor and an actuating device conditioning circuit defined in the valve body. The conditioning circuit includes a tube made of a first material able to conduct heat, and the valve body is entirely made of a second metal material and is provided with a seat for housing the tube, in which is provided a layer of a structural and heat-conducting resin, interposed between the seat and the tube.

Out of connection passages connecting the engine cooling circuit and the intercooler cooling circuit, a coolant inflow passage is connected between downstream of a mechanical pump and also upstream of a main radiator of the engine cooling circuit, and downstream of a sub radiator and also upstream of an electric pump of the intercooler cooling circuit, and a coolant outflow passage is connected between downstream of the electric pump and also upstream of the sub radiator of the intercooler cooling circuit, and downstream of the mechanical pump and also upstream of the main radiator of the engine cooling circuit. An inter-cooling circuit valve is provided in the coolant inflow passage.

An electromechanical actuator to operate a component in an internal combustion engine comprising an actuator body housing, on the inside, an actuator device, which controls the movement of the component so as to move it between a maximum opening position and a maximum closing position, and vice versa. The actuator device includes an electric motor and a gear drive that transmits the motion from the electric motor to the component. The electromechanical actuator is made of a first metal material and comprises a conditioning circuit comprising a pipe for the passage of a conditioning fluid, which is made of a second thermally conductive material. A method of manufacturing the electromagnetic actuator is also disclosed.