Patents by Inventor Marcello Cristiani
Marcello Cristiani has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8496192Abstract: A fuel injector provided with: an injection valve comprising an injection nozzle; a mobile needle for regulating the fuel flow through the injection valve and ending with a shutting head, which engages a valve seat of the injection valve, is arranged externally with respect to injection valve and presents a predetermined sealing diameter; an actuator for displacing the needle between a closing position and an opening position of the injection valve; a closing spring which tends to maintain the needle in the closing position of the injection valve pushing the shutting head against the valve seat itself in a sense contrary to the feeding sense of the fuel; and a supporting body having a tubular shape and presenting a feeding channel within which a needle is arranged; the needle, at an opposite end of the shutting head, is coupled to a balancing channel, which is at ambient pressure.Type: GrantFiled: March 14, 2011Date of Patent: July 30, 2013Assignee: Magneti Marelli Powertrain, S.p.A.Inventors: Luca Mancini, Michele Petrone, Marcello Cristiani
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Patent number: 7980492Abstract: A fuel injector provided with: an injection valve comprising an injection nozzle; a mobile needle for regulating the fuel flow through the injection valve and ending with a shutting head, which engages a valve seat of the injection valve, is arranged externally with respect to injection valve and presents a predetermined sealing diameter; an actuator for displacing the needle between a closing position and an opening position of the injection valve; a closing spring which tends to maintain the needle in the closing position of the injection valve pushing the shutting head against the valve seat itself in a sense contrary to the feeding sense of the fuel; and a supporting body having a tubular shape and presenting a feeding channel within which a needle is arranged; the needle, at an opposite end of the shutting head, is coupled to a balancing channel, which is at ambient pressure.Type: GrantFiled: April 30, 2008Date of Patent: July 19, 2011Assignee: Magneti Marelli Powertrain S.p.A.Inventors: Luca Mancini, Michele Petrone, Marcello Cristiani
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Publication number: 20110163189Abstract: A fuel injector provided with: an injection valve comprising an injection nozzle; a mobile needle for regulating the fuel flow through the injection valve and ending with a shutting head, which engages a valve seat of the injection valve, is arranged externally with respect to injection valve and presents a predetermined sealing diameter; an actuator for displacing the needle between a closing position and an opening position of the injection valve; a closing spring which tends to maintain the needle in the closing position of the injection valve pushing the shutting head against the valve seat itself in a sense contrary to the feeding sense of the fuel; and a supporting body having a tubular shape and presenting a feeding channel within which a needle is arranged; the needle, at an opposite end of the shutting head, is coupled to a balancing channel, which is at ambient pressure.Type: ApplicationFiled: March 14, 2011Publication date: July 7, 2011Inventors: Luca Mancini, Michele Petrone, Marcello Cristiani
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Patent number: 7850100Abstract: An embodiment of a fuel injector comprising: an injection valve provided with a mobile needle for regulating the fuel flow through an injection nozzle; a supporting body having a tubular shaft and displaying a feeding channel which ends with the injection valve; and an electromagnetic actuator comprising a spring which tends to maintain the needle in a closing position and an electromagnet, which comprises a coil arranged outside the supporting body, a fixed magnetic armature arranged within the supporting body, and a keeper which is arranged within the supporting body, is magnetically attracted by the magnetic armature against the bias of the spring, and is mechanically connected to the needle; the coil displaying a toroidal shape having an internal annular surface, which is directly in contact with an external surface of the supporting body without the interposition of any intermediate element.Type: GrantFiled: December 12, 2007Date of Patent: December 14, 2010Assignee: Magneti Marelli Powertrain S.p.A.Inventors: Luca Cagnolati, Massimo Mattioli, Marcello Cristiani
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Patent number: 7546961Abstract: A fuel injector equipped with an injection valve comprising a mobile plunger ending with a sealing head; a support body having a tubular shape and comprising a feed channel; and a sealing body, in which is defined a valve seat of the injection valve; the sealing head is of a frustoconical shape, is arranged externally relative to the guide element, is thrust by a spring against said guide element in a direction contrary to the direction of feed of the fuel; the valve seat has a frustoconical shape which is a negative reproduction of the frustoconical shape of the sealing head in order to impart an internally hollow conical shape to the injected fuel.Type: GrantFiled: April 28, 2006Date of Patent: June 16, 2009Assignee: Magneti Marelli Powertrain S.p.A.Inventors: Marcello Cristiani, Paolo Pasquali
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Patent number: 7506827Abstract: A fuel injector (1) having an injection valve (7) with a movable pin (15); and an actuator (5) for moving the pin (15) between a closed position and an open position; the actuator (5) has a movable armature (10), and an antirebound device (20) interposed between the movable armature (10) and the pin (15) to connect the movable armature (10) and the pin (15) mechanically; the antirebound device (20) has a deformable elastic plate (32; 45; 48) which is annular in shape, is connected centrally to the pin (15), and is connected laterally to the armature (10) to transmit at least the closing movement of the injection valve (7) from the armature 15 (10) to the pin (15).Type: GrantFiled: February 20, 2004Date of Patent: March 24, 2009Assignee: Magneti Marelli Powertrain S.p.A.Inventors: Michele Petrone, Luca Cagnolati, Luca Mancini, Marcello Cristiani, Mauro Venturoli
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Publication number: 20080290194Abstract: A fuel injector provided with: an injection valve comprising an injection nozzle; a mobile needle for regulating the fuel flow through the injection valve and ending with a shutting head, which engages a valve seat of the injection valve, is arranged externally with respect to injection valve and presents a predetermined sealing diameter; an actuator for displacing the needle between a closing position and an opening position of the injection valve; a closing spring which tends to maintain the needle in the closing position of the injection valve pushing the shutting head against the valve seat itself in a sense contrary to the feeding sense of the fuel; and a supporting body having a tubular shape and presenting a feeding channel within which a needle is arranged; the needle, at an opposite end of the shutting head, is coupled to a balancing channel, which is at ambient pressure.Type: ApplicationFiled: April 30, 2008Publication date: November 27, 2008Inventors: Luca Mancini, Michele Petrone, Marcello Cristiani
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Publication number: 20080156906Abstract: An embodiment of a fuel injector comprising: an injection valve provided with a mobile needle for regulating the fuel flow through an injection nozzle; a supporting body having a tubular shaft and displaying a feeding channel which ends with the injection valve; and an electromagnetic actuator comprising a spring which tends to maintain the needle in a closing position and an electromagnet, which comprises a coil arranged outside the supporting body, a fixed magnetic armature arranged within the supporting body, and a keeper which is arranged within the supporting body, is magnetically attracted by the magnetic armature against the bias of the spring, and is mechanically connected to the needle; the coil displaying a toroidal shape having an internal annular surface, which is directly in contact with an external surface of the supporting body without the interposition of any intermediate element.Type: ApplicationFiled: December 12, 2007Publication date: July 3, 2008Applicant: Magneti Marelli Powertrain S.p.AInventors: Luca Cagnolati, Massimo Mattioli, Marcello Cristiani
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Patent number: 7204434Abstract: A fuel injector has an injection valve having a movable pin terminating with a shutter head; a tubular supporting body having a feed channel; and a sealing body, in which a valve seat of the injection valve is defined; the shutter head is truncated-cone-shaped, is located outside the sealing body, and, in a closed position, is pushed against the sealing body in the opposite direction to the fuel feed direction; the pin has a stop member, which is integral with the pin and comes to rest on a top surface of the sealing body, when the pin is in the open position opening the injection valve, so as to determine travel of the pin.Type: GrantFiled: June 16, 2006Date of Patent: April 17, 2007Assignee: Magneti Marelli Powertrain S.p.A.Inventors: Paolo Pasquali, Luigi Gagliardi, Marcello Cristiani
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Publication number: 20070001033Abstract: A fuel injector has an injection valve having a movable pin terminating with a shutter head; a tubular supporting body having a feed channel; and a sealing body, in which a valve seat of the injection valve is defined; the shutter head is truncated-cone-shaped, is located outside the sealing body, and, in a closed position, is pushed against the sealing body in the opposite direction to the fuel feed direction; the pin has a stop member, which is integral with the pin and comes to rest on a top surface of the sealing body, when the pin is in the open position opening the injection valve, so as to determine travel of the pin.Type: ApplicationFiled: June 16, 2006Publication date: January 4, 2007Inventors: Paolo Pasquali, Luigi Gagliardi, Marcello Cristiani
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Patent number: 7140556Abstract: A fuel injector provided with an injection valve comprising a mobile plunger; an injection jet having a plurality of first through-holes made starting from a chamber arranged downstream from the injection valve; a supporting body having a tubular shape and comprising a supply channel; and a sealing body, in which a valve seat of the injection valve is defined and the injection jet is provided; the sealing body is monolithic and has a disc-shaped plug member passed through by the injection jet, and a guide member, which rises up from the plug member, is tubular in shape, receives within it the plunger and has an external diameter smaller than the internal diameter of the supply channel, so as to define an external annular channel for the fuel; in the lower part of the guide member there are provided a number of second through-holes which open into the valve seat.Type: GrantFiled: September 9, 2005Date of Patent: November 28, 2006Assignee: Magneti Marelli Powertrain S.p.A.Inventors: Marcello Cristiani, Michele Petrone
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Publication number: 20060255185Abstract: A fuel injector equipped with an injection valve comprising a mobile plunger ending with a sealing head; a support body having a tubular shape and comprising a feed channel; and a sealing body, in which is defined a valve seat of the injection valve; the sealing head is of a frustoconical shape, is arranged externally relative to the guide element, is thrust by a spring against said guide element in a direction contrary to the direction of feed of the fuel; the valve seat has a frustoconical shape which is a negative reproduction of the frustoconical shape of the sealing head in order to impart an internally hollow conical shape to the injected fuel.Type: ApplicationFiled: April 28, 2006Publication date: November 16, 2006Inventors: Marcello Cristiani, Paolo Pasquali
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Publication number: 20060192035Abstract: A fuel injector (1) having an injection valve (7) with a movable pin (15); and an actuator (5) for moving the pin (15) between a closed position and an open position; the actuator (5) has a movable armature (10), and an antirebound device (20) interposed between the movable armature (10) and the pin (15) to connect the movable armature (10) and the pin (15) mechanically; the antirebound device (20) has a deformable elastic plate (32; 45; 48) which is annular in shape, is connected centrally to the pin (15), and is connected laterally to the armature (10) to transmit at least the closing movement of the injection valve (7) from the armature 15 (10) to the pin (15).Type: ApplicationFiled: February 20, 2004Publication date: August 31, 2006Inventors: Michele Petrone, Luca Cagnolati, Luca Mancini, Marcello Cristiani, Mauro Venturoli
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Publication number: 20060060674Abstract: A fuel injector provided with an injection valve comprising a mobile plunger; an injection jet having a plurality of first through-holes made starting from a chamber arranged downstream from the injection valve; a supporting body having a tubular shape and comprising a supply channel; and a sealing body, in which a valve seat of the injection valve is defined and the injection jet is provided; the sealing body is monolithic and has a disc-shaped plug member passed through by the injection jet, and a guide member, which rises up from the plug member, is tubular in shape, receives within it the plunger and has an external diameter smaller than the internal diameter of the supply channel, so as to define an external annular channel for the fuel; in the lower part of the guide member there are provided a number of second through-holes which open into the valve seat.Type: ApplicationFiled: September 9, 2005Publication date: March 23, 2006Applicant: MAGNETI MARELLI POWERTRAIN S.p.A.Inventors: Marcello Cristiani, Michele Petrone
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Publication number: 20050207912Abstract: In a fuel pump for an internal combustion engine, a pumping device is adapted to vary the volume of a first chamber containing the fuel and is formed by a second chamber adapted to contain oil, a deformable diaphragm for the leak-tight separation of the chambers from one another, and by a piston mounted to slide within the second chamber and comprising an active end surface bounding this second chamber; the diaphragm being adapted to be deformed to vary the volume of the first chamber under the action of the thrust exerted by the oil contained in the second chamber following an alternating movement of the piston within this second chamber.Type: ApplicationFiled: November 18, 2004Publication date: September 22, 2005Applicant: Magneti Marelli Powertrain S.p.A.Inventors: Massimo Lolli, Marcello Cristiani, Paolo Pasquali, Cecilia Lamberti, Massimo Mattioli
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Patent number: 6932284Abstract: An electromagnetic fuel injector for an internal combustion engine, comprising a main body having a central cylindrical cavity adapted to act as a duct for the fuel, a valve which is disposed to close an end of the central cylindrical cavity and is provided with a moving shutter, an electromagnetic actuator which is provided with a coil, a fixed armature, and a moving armature mechanically connected to the shutter and adapted to be magnetically attracted by the fixed armature against the action of a spring, and a monolithic tubular member which is disposed coaxially within the central cylindrical cavity and houses the fixed armature and the moving armature.Type: GrantFiled: December 11, 2003Date of Patent: August 23, 2005Assignee: Magneti Marelli Powertrain S.p.A.Inventors: Marcello Cristiani, Mirco Vignoli
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Publication number: 20040169095Abstract: An electromagnetic fuel injector for an internal combustion engine, comprising a main body having a central cylindrical cavity adapted to act as a duct for the fuel, a valve which is disposed to close an end of the central cylindrical cavity and is provided with a moving shutter, an electromagnetic actuator which is provided with a coil, a fixed armature, and a moving armature mechanically connected to the shutter and adapted to be magnetically attracted by the fixed armature against the action of a spring, and a monolithic tubular member which is disposed coaxially within the central cylindrical cavity and houses the fixed armature and the moving armature.Type: ApplicationFiled: December 11, 2003Publication date: September 2, 2004Inventors: Marcello Cristiani, Mirco Vignoli
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Patent number: 6688264Abstract: Method for piloting electromagnetic actuators for the control of the valves of an engine; each electromagnetic actuator is provided with at least one respective electromagnet, which is piloted by a common piloting device by means of the supply of an electric current wave which has two, initial and end control portions in which the intensity of the electric current varies rapidly and an intermediate maintenance portion in which the intensity of the electric current remains substantially constant; the method consists of supplying respective electric current waves cyclically to the electromagnets in order to control the valves according to the drive point, and to vary at a control portion of each wave the value of the intensity of the electric current supplied during the portions of maintenance of the other waves in order to limit the variation of the quantity of electric charge distributed overall by the piloting device.Type: GrantFiled: September 19, 2002Date of Patent: February 10, 2004Assignee: Magneti Marelli Powertrain S.p.A.Inventors: Marcello Cristiani, Gianni Padroni, Aurelio Rivizzigno
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Patent number: 6568360Abstract: Electrohydraulic device for operating an intake or exhaust valve of a combustion engine; the electrohydraulic device comprises a linear hydraulic actuator designed to move the valve axially from a closed position to a maximum opening position, and an electronic control hydraulic distributor designed to regulate the flow of pressurized liquid from and towards the linear hydraulic actuator in order to control movement of the above-mentioned valve between the closed and maximum opening positions; the electronic control hydraulic distributor comprises a slide valve which, by selection, can be set to three positions: a first operating position in which it establishes direct communication between the linear hydraulic actuator and an outlet of the pressurized liquid, a second operating position in which it isolates the linear hydraulic actuator in such a way as to prevent the flow of pressurized liquid from or towards the actuator, and a third operating position which establishes direct communication between the linType: GrantFiled: February 20, 2002Date of Patent: May 27, 2003Assignee: Magneti Marelli Powertrain S.p.A.Inventors: Marcello Cristiani, Nicola Morelli
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Publication number: 20030056742Abstract: Method for piloting electromagnetic actuators for the control of the valves of an engine; each electromagnetic actuator is provided with at least one respective electromagnet, which is piloted by a common piloting device by means of the supply of an electric current wave which has two, initial and end control portions in which the intensity of the electric current varies rapidly and an intermediate maintenance portion in which the intensity of the electric current remains substantially constant; the method consists of supplying respective electric current waves cyclically to the electromagnets in order to control the valves according to the drive point, and to vary at a control portion of each wave the value of the intensity of the electric current supplied during the portions of maintenance of the other waves in order to limit the variation of the quantity of electric charge distributed overall by the piloting device.Type: ApplicationFiled: September 19, 2002Publication date: March 27, 2003Applicant: Magneti Marelli Powertrain S.p.A.Inventors: Marcello Cristiani, Gianni Padroni, Aurelio Rivizzigno