Patents by Inventor David L. Buchanan

David L. Buchanan 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).

  • Publication number: 20180163594
    Abstract: An injector, comprising, an injector body comprising, an inner wall that defines an injector cavity for fluid, at least one inlet channel into the injector cavity, and at least one outlet channel from the injector cavity, a plunger that defines at least one passageway between the injector cavity and the at least one outlet channel, the plunger being movable longitudinally in the injector cavity between at least: a first open arrangement in which the at least one passageway is positioned to direct fluid into the at least one outlet channel at a first position, and a second open arrangement in which the at least one passageway is positioned to direct fluid into the at least one outlet channel at a second position different from the first position.
    Type: Application
    Filed: February 7, 2018
    Publication date: June 14, 2018
    Applicant: CUMMINS INC.
    Inventors: Bradlee J. Stroia, Lester L. Peters, David L. Buchanan, Rajesh K. Garg, Wei Ning
  • Publication number: 20180080405
    Abstract: The present disclosure provides a fuel injector for an internal combustion engine with a fuel injector body having a valve chamber, a first conduit in fluid communication with the valve chamber for a first flow of fuel having a first pressure, and a second conduit in fluid communication with the valve chamber for a second flow of fuel having a second pressure. The fuel injector further includes a valve member configured to move between the first conduit and the second conduit. Additionally, an actuator of the fuel injector is configured to move the valve member during a fuel injection cycle. The fuel injector is configured to operate in at least three modes.
    Type: Application
    Filed: November 29, 2017
    Publication date: March 22, 2018
    Applicant: CUMMINS INC.
    Inventors: Lester L. Peters, David L. Buchanan, Bradlee J. Stroia, William David Daniel, Rajesh K. Garg, Richard D. Thomas
  • Patent number: 9920674
    Abstract: An injector, comprising, an injector body comprising, an inner wall that defines an injector cavity for fluid, at least one inlet channel into the injector cavity, and at least one outlet channel from the injector cavity, a plunger that defines at least one passageway between the injector cavity and the at least one outlet channel, the plunger being movable longitudinally in the injector cavity between at least: a first open arrangement in which the at least one passageway is positioned to direct fluid into the at least one outlet channel at a first position, and a second open arrangement in which the at least one passageway is positioned to direct fluid into the at least one outlet channel at a second position different from the first position.
    Type: Grant
    Filed: January 8, 2015
    Date of Patent: March 20, 2018
    Assignee: Cummins Inc.
    Inventors: Bradlee J. Stroia, Lester L. Peters, David L. Buchanan, Rajesh K. Garg, Wei Ning
  • Patent number: 9903329
    Abstract: A fuel injector is provided that includes various precise configuration parameters, including dimensions, shape and/or relative positioning of fuel injector features, resulting in improved efficiency of fuel flow through the fuel injector.
    Type: Grant
    Filed: April 16, 2012
    Date of Patent: February 27, 2018
    Assignee: CUMMINS INTELLECTUAL PROPERTY, INC.
    Inventors: Lester L. Peters, Jeffrey C. Huang, David L. Buchanan, Corydon Edward Morris, Gary Gant, Denis Gill, Heribert Kammerstetter, Ernst Winklhofer
  • Patent number: 9897053
    Abstract: A fuel injector is provided comprising an outer housing, a nozzle housing disposed within the outer housing, a flow path between the outer housing and the nozzle housing, the flow path being coupled to a low pressure fuel source, and a circumferential gap in flow communication with the flow path and extending about a tip of the fuel injector between an outer surface of the nozzle housing and an inner surface of a combustion shield adjacent the injector tip. The circumferential gap is in flow communication with a drain gap between the outer housing and a bore for receiving the fuel injector, the drain gap routing the low pressure fuel away from the injector tip.
    Type: Grant
    Filed: August 12, 2016
    Date of Patent: February 20, 2018
    Assignee: Cummins Inc.
    Inventors: Steven J. Kolhouse, Raymond V. Primus, Lester L. Peters, David L. Buchanan
  • Patent number: 9897033
    Abstract: The present disclosure provides a fuel injector for an internal combustion engine with a fuel injector body having a valve chamber, a first conduit in fluid communication with the valve chamber for a first flow of fuel having a first pressure, and a second conduit in fluid communication with the valve chamber for a second flow of fuel having a second pressure. The fuel injector further includes a valve member configured to move between the first conduit and the second conduit. Additionally, an actuator of the fuel injector is configured to move the valve member during a fuel injection cycle. The fuel injector is configured to operate in at least three modes.
    Type: Grant
    Filed: May 15, 2015
    Date of Patent: February 20, 2018
    Assignee: CUMMINS INC.
    Inventors: Lester L. Peters, David L. Buchanan, Bradlee J. Stroia, William David Daniel, Rajesh K. Garg, Richard D. Thomas
  • Patent number: 9739246
    Abstract: A fuel injector is provided that creates variable spray characteristics to effectively reduce emissions, such as NOx emissions and particulate matter. The injector includes a nozzle valve element of the outwardly opening type including a fuel delivery passage and spray holes. The nozzle valve element is operable to move to a low lift position to cause fuel flowing from the spray holes to impinge on the injector body and to deflect toward the combustion chamber, and to move to a high lift position to cause fuel flowing from the spray holes to avoid impingement on injector body and flow in an obstructed manner directly into the combustion chamber. An annular chamber may be formed in the nozzle valve element adjacent the spray holes to receive fuel.
    Type: Grant
    Filed: May 26, 2015
    Date of Patent: August 22, 2017
    Assignee: CUMMINS INC.
    Inventors: Lester Peters, David L. Buchanan
  • Publication number: 20170051713
    Abstract: An injector combustion shield assembly comprising a bore configured to receive a fuel injector, the bore including a fluid opening in fluid communication with a fluid jacket and a fluid outlet positioned within an annular wall of the bore; and a valve positioned between the fluid jacket and the fluid opening and configured to selectively permit a fluid from the fluid jacket to enter the bore, the valve being movable between an open configuration to permit fluid flow from the fluid jacket into the bore via the fluid opening and a closed configuration to prevent fluid flow from the fluid jacket into the bore.
    Type: Application
    Filed: August 19, 2016
    Publication date: February 23, 2017
    Inventors: Lester L. Peters, David L. Buchanan, Timothy P. Lutz, David B. Snyder, Derek G. Weiler, Clayton R. Westerfeld, Julie Anne Colin, Akintomide K. Akinola, Joseph Eric Parlow, Steven J. Kolhouse
  • Publication number: 20170045023
    Abstract: A fuel injector is provided comprising an outer housing, a nozzle housing disposed within the outer housing, a flow path between the outer housing and the nozzle housing, the flow path being coupled to a low pressure fuel source, and a circumferential gap in flow communication with the flow path and extending about a tip of the fuel injector between an outer surface of the nozzle housing and an inner surface of a combustion shield adjacent the injector tip. The circumferential gap is in flow communication with a drain gap between the outer housing and a bore for receiving the fuel injector, the drain gap routing the low pressure fuel away from the injector tip.
    Type: Application
    Filed: August 12, 2016
    Publication date: February 16, 2017
    Inventors: Steven J. Kolhouse, Raymond V. Primus, Lester L. Peters, David L. Buchanan
  • Patent number: 9562505
    Abstract: The disclosure provides an improved fuel injector and method of operating the fuel injector to provide at least two different types of fuel spray to a combustion chamber of an internal combustion engine. The two types of spray are formed by providing a first fuel pressure to the fuel injector during a first portion of an injection event at a first pressure and providing a second fuel pressure to the fuel injection during a second portion of the injection event, and maintaining a substantially constant fuel flow rate throughout the injection event.
    Type: Grant
    Filed: June 11, 2013
    Date of Patent: February 7, 2017
    Assignee: Cummins Inc.
    Inventors: Vesa Hokkanen, David L. Buchanan, Lester L. Peters, Rajesh K. Garg
  • Patent number: 9506429
    Abstract: The present disclosure provides an improved system and method of operating a fuel injector of an engine to provide at least two different types of fuel spray in a combustion chamber of the engine by application of ultrasonic pulses to fuel in the fuel injector during an injection event. A first type of spray includes larger droplets that reduce the effective diffusion combustion area around the droplets and a second type of spray includes relatively small droplets that increase the effective diffusion combustion area around the droplets.
    Type: Grant
    Filed: June 11, 2013
    Date of Patent: November 29, 2016
    Assignee: Cummins Inc.
    Inventors: Lester L. Peters, David L. Buchanan, Vesa Hokkanen
  • Publication number: 20160138586
    Abstract: A fuel pump is disclosed wherein a substantially cylindrical plunger bore is provided with an annular drain groove fluidically coupled to a drain duct. A pump plunger is driven by a drive system located in a separate mechanical compartment that holds a reservoir of lubricating oil. An annular seal is provided adjacent the drain groove substantially at the end of the bore and retained in position by a seal support. Exemplary embodiments provide the drain groove and seal as being positioned immediately adjacent one another so that the seal forms a lower wall of the drain groove.
    Type: Application
    Filed: October 5, 2015
    Publication date: May 19, 2016
    Inventors: John D. Crofts, Scott R. Simmons, Wesley R. Thayer, Bela Doszpoly, David M. Rix, Anthony A. Shaull, David L. Buchanan
  • Publication number: 20150330344
    Abstract: The present disclosure provides a fuel injector for an internal combustion engine with a fuel injector body having a valve chamber, a first conduit in fluid communication with the valve chamber for a first flow of fuel having a first pressure, and a second conduit in fluid communication with the valve chamber for a second flow of fuel having a second pressure. The fuel injector further includes a valve member configured to move between the first conduit and the second conduit. Additionally, an actuator of the fuel injector is configured to move the valve member during a fuel injection cycle. The fuel injector is configured to operate in at least three modes.
    Type: Application
    Filed: May 15, 2015
    Publication date: November 19, 2015
    Inventors: Lester L. Peters, David L. Buchanan, Bradlee J. Stroia, William David Daniel, Rajesh K. Garg, Richard D. Thomas
  • Patent number: 9151289
    Abstract: A fuel pump is disclosed wherein a substantially cylindrical plunger bore is provided with an annular drain groove fluidically coupled to a drain duct. A pump plunger is driven by a drive system located in a separate mechanical compartment that holds a reservoir of lubricating oil. An annular seal is provided adjacent the drain groove substantially at the end of the bore and retained in position by a seal support. Exemplary embodiments provide the drain groove and seal as being positioned immediately adjacent one another so that the seal forms a lower wall of the drain groove.
    Type: Grant
    Filed: August 21, 2008
    Date of Patent: October 6, 2015
    Assignee: Cummins Inc.
    Inventors: John D. Crofts, Scott R. Simmons, Wesley R. Thayer, Bela Doszpoly, David M. Rix, Anthony A. Shaull, David L. Buchanan
  • Publication number: 20150252767
    Abstract: A fuel injector is provided that creates variable spray characteristics to effectively reduce emissions, such as NOx emissions and particulate matter. The injector includes a nozzle valve element of the outwardly opening type including a fuel delivery passage and spray holes. The nozzle valve element is operable to move to a low lift position to cause fuel flowing from the spray holes to impinge on the injector body and to deflect toward the combustion chamber, and to move to a high lift position to cause fuel flowing from the spray holes to avoid impingement on injector body and flow in an obstructed manner directly into the combustion chamber. An annular chamber may be formed in the nozzle valve element adjacent the spray holes to receive fuel.
    Type: Application
    Filed: May 26, 2015
    Publication date: September 10, 2015
    Inventors: Lester Peters, David L. Buchanan
  • Publication number: 20150190753
    Abstract: An injector, comprising, an injector body comprising, an inner wall that defines an injector cavity for fluid, at least one inlet channel into the injector cavity, and at least one outlet channel from the injector cavity, a plunger that defines at least one passageway between the injector cavity and the at least one outlet channel, the plunger being movable longitudinally in the injector cavity between at least: a first open arrangement in which the at least one passageway is positioned to direct fluid into the at least one outlet channel at a first position, and a second open arrangement in which the at least one passageway is positioned to direct fluid into the at least one outlet channel at a second position different from the first position.
    Type: Application
    Filed: January 8, 2015
    Publication date: July 9, 2015
    Inventors: Bradlee J. Stroia, Lester L. Peters, David L. Buchanan, Rajesh K. Garg, Wei Ning
  • Patent number: 9062642
    Abstract: A fuel injector is provided that creates variable spray characteristics to effectively reduce emissions, such as NOx emissions and particulate matter. The injector includes a nozzle valve element of the outwardly opening type including a fuel delivery passage and spray holes. The nozzle valve element is operable to move to a low lift position to cause fuel flowing from the spray holes to impinge on the injector body and to deflect toward the combustion chamber, and to move to a high lift position to cause fuel flowing from the spray holes to avoid impingement on injector body and flow in an obstructed manner directly into the combustion chamber. An annular chamber may be formed in the nozzle valve element adjacent the spray holes to receive fuel.
    Type: Grant
    Filed: March 21, 2011
    Date of Patent: June 23, 2015
    Assignee: Cummins Inc.
    Inventors: Lester L. Peters, David L. Buchanan
  • Patent number: 9038601
    Abstract: A flow limiter for a fuel system is provided. The flow limiter includes a self-contained portion that enables testing of the flow limiter prior to assembly into a fuel system. A housing of the flow limiter is arranged to provide reduced or no pressure differential across a wall of the housing, permitting the housing to be reduced in size and thickness and providing improved consistency of operation.
    Type: Grant
    Filed: November 1, 2012
    Date of Patent: May 26, 2015
    Assignee: Cummins Inc.
    Inventors: Corydon E. Morris, David L. Buchanan
  • Publication number: 20140361096
    Abstract: The disclosure provides an improved fuel injector and method of operating the fuel injector to provide at least two different types of fuel spray to a combustion chamber of an internal combustion engine. The two types of spray are formed by providing a first fuel pressure to the fuel injector during a first portion of an injection event at a first pressure and providing a second fuel pressure to the fuel injection during a second portion of the injection event, and maintaining a substantially constant fuel flow rate throughout the injection event.
    Type: Application
    Filed: June 11, 2013
    Publication date: December 11, 2014
    Inventors: Vesa HOKKANEN, David L. BUCHANAN, Lester L. PETERS, Rajesh K. GARG
  • Publication number: 20140360460
    Abstract: The present disclosure provides an improved system and method of operating a fuel injector of an engine to provide at least two different types of fuel spray in a combustion chamber of the engine by application of ultrasonic pulses to fuel in the fuel injector during an injection event. A first type of spray includes larger droplets that reduce the effective diffusion combustion area around the droplets and a second type of spray includes relatively small droplets that increase the effective diffusion combustion area around the droplets.
    Type: Application
    Filed: June 11, 2013
    Publication date: December 11, 2014
    Inventors: Lester L. PETERS, David L. BUCHANAN, Vesa HOKKANEN