Patents by Inventor Nadeem N. Bunni
Nadeem N. Bunni 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: 9140224Abstract: An apparatus and method for controlling fluid flow is disclosed. An electromagnetic actuator may include a stator having an inner pole member and an outer pole member. The outer pole member may have a fluid passageway therein for transmitting fluid through the outer pole member. The actuator may further include a coil disposed around the inner pole member and arranged between the inner pole member and the outer pole member. The actuator may also include an armature moveable under the influence of a magnetic field generated by the stator and coil and operable to affect transmission of the fluid through the fluid passageway.Type: GrantFiled: June 17, 2005Date of Patent: September 22, 2015Assignee: Caterpillar Inc.Inventors: Harish K Krishnaswamy, Nadeem N Bunni, Stephen R Lewis, Dana R Coldren
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Patent number: 8690118Abstract: A solenoid actuated device such as a fuel injector includes an actuator body having a plurality of body pieces, and a single-pole solenoid actuator assembly positioned at least partially within the actuator body. The single-pole solenoid actuator assembly includes a one-piece compound armature housing having a load carrying component clamped between the first body piece and the second body piece, and a flux carrying component. The load carrying component includes a high structural strength and a low flux permeability, and the flux carrying component includes a low structural strength and a high flux permeability. A method of making a solenoid actuated device includes placing an armature at a sliding radial air gap with a flux carrying component of a one-piece compound armature housing, and establishing a structural load path by placing a load carrying component of the compound armature housing between a first actuator body piece and a second actuator body piece.Type: GrantFiled: January 8, 2010Date of Patent: April 8, 2014Assignee: Caterpillar Inc.Inventors: Nadeem N. Bunni, Jayaraman K. Venkataraghavan, Stephen R. Lewis
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Publication number: 20130113583Abstract: A solenoid actuator includes a stator assembly with a stator core of formed powder metal received in a stator housing. A ferromagnetic protective sleeve is in contact with and covers a majority of an inner end face and a cylindrical wall of the stator core, while a flux ring is in contact with and covers an outer end face of the stator core. An armature assembly includes an armature attached to a stem that is movable in an air gap relative to the ferromagnetic protective sleeve. A spring is operably positioned in the ferromagnetic protective sleeve but electrically isolated from the stator housing. The stator core is encapsulated to protect against erosion and fragmentation. A magnetic flux line around a solenoid coil passes through the stator core, the ferromagnetic protective sleeve, the armature, the flux ring and back to the stator core.Type: ApplicationFiled: November 9, 2011Publication date: May 9, 2013Applicant: CATERPILLAR, INC.Inventors: Jayaraman K. Venkataraghavan, Saboor Sheikh, Daniel Richard Ibrahim, Michael C. Long, Nadeem N. Bunni
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Patent number: 8436704Abstract: A solenoid actuator includes a stator assembly with a stator core of formed powder metal received in a stator housing. A ferromagnetic protective sleeve is in contact with and covers a majority of an inner end face and a cylindrical wall of the stator core, while a flux ring is in contact with and covers an outer end face of the stator core. An armature assembly includes an armature attached to a stem that is movable in an air gap relative to the ferromagnetic protective sleeve. A spring is operably positioned in the ferromagnetic protective sleeve but electrically isolated from the stator housing. The stator core is encapsulated to protect against erosion and fragmentation. A magnetic flux line around a solenoid coil passes through the stator core, the ferromagnetic protective sleeve, the armature, the flux ring and back to the stator core.Type: GrantFiled: November 9, 2011Date of Patent: May 7, 2013Assignee: Caterpillar Inc.Inventors: Jayaraman K. Venkataraghavan, Saboor Sheikh, Daniel Richard Ibrahim, Michael C. Long, Nadeem N. Bunni
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Publication number: 20120061491Abstract: A fuel injector for a common rail fuel system includes a common rail inlet port fluidly connected to a high pressure common rail, and a cooling inlet fluidly connected to an output from a lower pressure fuel transfer pump. The cooling fluid circulates internally through the fuel injector to cool a single pole solenoid via both internal and peripheral cooling passages. In order to accommodate a small spatial envelope while providing superior performance, a thin insulating layer may separate the solenoid coil winding from an inner pole piece, and small flux gap clearances may permit a flux carrying portion of the injector body to be a portion of the single pole solenoid assembly.Type: ApplicationFiled: November 15, 2011Publication date: March 15, 2012Applicant: CATERPILLAR INC.Inventors: Jayaraman K. Venkataraghavan, Stephen R. Lewis, Shriprasad Lakhapati, Avinash R. Manubolu, Nadeem N. Bunni
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Patent number: 8074903Abstract: A fuel injector for a common rail fuel system includes a common rail inlet port fluidly connected to a high pressure common rail, and a cooling inlet fluidly connected to an output from a lower pressure fuel transfer pump. The cooling fluid circulates internally through the fuel injector to cool a single pole solenoid via both internal and peripheral cooling passages. In order to accommodate a small spatial envelope while providing superior performance, a thin insulating layer may separate the solenoid coil winding from an inner pole piece, and small flux gap clearances may permit a flux carrying portion of the injector body to be a portion of the single pole solenoid assembly.Type: GrantFiled: January 13, 2009Date of Patent: December 13, 2011Assignee: Caterpillar Inc.Inventors: Jayaramanaraman K. Venkataraghavan, Stephen R. Lewis, Shriprasad Lakhapati, Avinash R. Manubolu, Nadeem N. Bunni
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Publication number: 20110168813Abstract: A solenoid actuated device such as a fuel injector includes an actuator body having a plurality of body pieces, and a single-pole solenoid actuator assembly positioned at least partially within the actuator body. The single-pole solenoid actuator assembly includes a one-piece compound armature housing having a load carrying component clamped between the first body piece and the second body piece, and a flux carrying component. The load carrying component includes a high structural strength and a low flux permeability, and the flux carrying component includes a low structural strength and a high flux permeability. A method of making a solenoid actuated device includes placing an armature at a sliding radial air gap with a flux carrying component of a one-piece compound armature housing, and establishing a structural load path by placing a load carrying component of the compound armature housing between a first actuator body piece and a second actuator body piece.Type: ApplicationFiled: January 8, 2010Publication date: July 14, 2011Applicant: CATERPILLAR INC.Inventors: Nadeem N. Bunni, Jayaraman K. Venkataraghavan, Stephen R. Lewis
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Patent number: 7866301Abstract: A self-guided armature assembly for a single pole solenoid assembly includes an armature stem and an armature. The solenoid assembly includes a flux ring component and an actuator body. The armature is movable inside the flux ring. An axial air gap is defined between the top armature surface of the armature and a bottom stator surface of a stator assembly. A sliding air gap is defined between an inner diameter surface of the flux ring and an outer diameter surface of the armature. The self-guided armature is guided along the flux ring via a guiding interaction between the armature and the flux ring. The sliding air gap is smaller than the axial air gap. A stem clearance gap is defined between the armature stem and the actuator body. The sliding air gap is also smaller than the stem clearance gap.Type: GrantFiled: January 26, 2009Date of Patent: January 11, 2011Assignee: Caterpillar Inc.Inventors: Jayaraman K. Venkataraghavan, Stephen R. Lewis, Nadeem N. Bunni, Shriprasad Lakhapati
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Publication number: 20100186719Abstract: A self-guided armature assembly for a single pole solenoid assembly includes an armature stem and an armature. The solenoid assembly includes a flux ring component and an actuator body. The armature is movable inside the flux ring. An axial air gap is defined between the top armature surface of the armature and a bottom stator surface of a stator assembly. A sliding air gap is defined between an inner diameter surface of the flux ring and an outer diameter surface of the armature. The self-guided armature is guided along the flux ring via a guiding interaction between the armature and the flux ring. The sliding air gap is smaller than the axial air gap. A stem clearance gap is defined between the armature stem and the actuator body. The sliding air gap is also smaller than the stem clearance gap.Type: ApplicationFiled: January 26, 2009Publication date: July 29, 2010Inventors: Jayaraman K. Venkataraghavan, Stephen R. Lewis, Nadeem N. Bunni, Shriprasad Lakhapati
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Publication number: 20100176223Abstract: A fuel injector for a common rail fuel system includes a common rail inlet port fluidly connected to a high pressure common rail, and a cooling inlet fluidly connected to an output from a lower pressure fuel transfer pump. The cooling fluid circulates internally through the fuel injector to cool a single pole solenoid via both internal and peripheral cooling passages. In order to accommodate a small spatial envelope while providing superior performance, a thin insulating layer may separate the solenoid coil winding from an inner pole piece, and small flux gap clearances may permit a flux carrying portion of the injector body to be a portion of the single pole solenoid assembly.Type: ApplicationFiled: January 13, 2009Publication date: July 15, 2010Inventors: Jayaraman K. Venkataraghavan, Stephen R. Lewis, Shriprasad Lakhapati, Avinash R. Manubolu, Nadeem N. Bunni
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Patent number: 7552719Abstract: A solenoid assembly is disclosed. The solenoid assembly has a housing having a cavity disposed therein. The solenoid assembly also has a unitary stator having a plurality of separated portions. The separated portions are held together by at least one lip located on an outer periphery of the stator. The stator is sized to fit within the cavity disposed in the housing.Type: GrantFiled: December 4, 2007Date of Patent: June 30, 2009Assignee: Caterpillar Inc.Inventors: Mandar A. Joshi, Harish Krishnaswamy, Dana R. Coldren, Nadeem N. Bunni
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Publication number: 20090139491Abstract: A solenoid assembly is disclosed. The solenoid assembly has a housing having a cavity disposed therein. The solenoid assembly also has a unitary stator having a plurality of separated portions. The separated portions are held together by at least one lip located on an outer periphery of the stator. The stator is sized to fit within the cavity disposed in the housing.Type: ApplicationFiled: December 4, 2007Publication date: June 4, 2009Inventors: Mandar A. Joshi, Harish Krishnaswamy, Dana R. Coldren, Nadeem N. Bunni