Patents by Inventor Robert K. Sollenskog

Robert K. Sollenskog 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).

  • Patent number: 11738615
    Abstract: A suspension element includes a main body having an internal volume, a tubular element extending at least partially within the main body, the main body and the tubular element each including a sidewall having an inner surface and an outer surface, a first piston assembly separating the internal volume of the main body into a first chamber and a second chamber, the second chamber defined by the outer surface of the tubular element, the inner surface of the main body, and a surface of the first piston assembly, and a second piston assembly including a side that is directly exposed to the first chamber. The sidewall of the main body defines an aperture therethrough that forms a portion of a flow path between the first chamber and the second chamber. The first piston assembly is configured to prevent direct fluid communication between the first chamber and the second chamber.
    Type: Grant
    Filed: April 12, 2021
    Date of Patent: August 29, 2023
    Assignee: Oshkosh Defense, LLC
    Inventors: Patrick S. Dillman, Robert K. Sollenskog, Erik Ellifson, Aaron J. Rositch
  • Patent number: 11685221
    Abstract: A valve assembly includes a valve body defining an inner volume, a flow controller positioned within the inner volume, a plug positioned within the inner volume, and a biasing element. The plug is spaced from the flow controller such that an intermediate chamber is defined between the plug and the flow controller. The biasing element is positioned in the intermediate chamber between the plug and the flow controller. The plug is repositionable within the inner volume. As the plug moves within the inner volume, the plug interacts with the biasing element such that the biasing element provides a biasing force to the flow controller.
    Type: Grant
    Filed: July 8, 2022
    Date of Patent: June 27, 2023
    Assignee: Oshkosh Defense, LLC
    Inventors: Jason J. Zuleger, Robert K. Sollenskog
  • Patent number: 11685219
    Abstract: A damper assembly for a vehicle suspension system includes a first damper and a second damper. The second damper includes a housing including a wall that defines an aperture, the wall and the first damper at least partially defining a chamber. The second damper also includes a piston positioned within the chamber, a conduit defining a flow path that includes the aperture, and a flow control device disposed along the flow path. The second damper is configured to provide a damping force that varies based on the position of the piston within the chamber.
    Type: Grant
    Filed: September 1, 2021
    Date of Patent: June 27, 2023
    Assignee: Oshkosh Defense, LLC
    Inventors: Erik S. Ellifson, Patrick S. Dillman, Jason J. Zuleger, Aaron J. Rositch, Robert K. Sollenskog
  • Publication number: 20220339987
    Abstract: A valve assembly includes a valve body defining an inner volume, a flow controller positioned within the inner volume, a plug positioned within the inner volume, and a biasing element. The plug is spaced from the flow controller such that an intermediate chamber is defined between the plug and the flow controller. The biasing element is positioned in the intermediate chamber between the plug and the flow controller. The plug is repositionable within the inner volume. As the plug moves within the inner volume, the plug interacts with the biasing element such that the biasing element provides a biasing force to the flow controller.
    Type: Application
    Filed: July 8, 2022
    Publication date: October 27, 2022
    Applicant: Oshkosh Defense, LLC
    Inventors: Jason J. Zuleger, Robert K. Sollenskog
  • Patent number: 11400789
    Abstract: A valve assembly for a vehicle suspension system includes a valve body, a first flow controller, a first plunger, a second flow controller, and a second plunger. The valve body defines a first inlet port, a first outlet port, a first chamber connected to the first inlet port and the first outlet port, a second chamber, a second inlet port, a second outlet port, a third chamber connected to the second inlet port and the second outlet port, and a fourth chamber. The first flow controller is positioned within the first chamber. The first plunger is positioned between the first chamber and the second chamber. The second flow controller is positioned within the third chamber. The second plunger is positioned between the third chamber and the fourth chamber.
    Type: Grant
    Filed: November 4, 2019
    Date of Patent: August 2, 2022
    Assignee: Oshkosh Defense, LLC
    Inventors: Jason J. Zuleger, Robert K. Sollenskog
  • Publication number: 20210394578
    Abstract: A damper assembly for a vehicle suspension system includes a first damper and a second damper. The second damper includes a housing including a wall that defines an aperture, the wall and the first damper at least partially defining a chamber. The second damper also includes a piston positioned within the chamber, a conduit defining a flow path that includes the aperture, and a flow control device disposed along the flow path. The second damper is configured to provide a damping force that varies based on the position of the piston within the chamber.
    Type: Application
    Filed: September 1, 2021
    Publication date: December 23, 2021
    Applicant: Oshkosh Defense, LLC
    Inventors: Erik S. Ellifson, Patrick S. Dillman, Jason J. Zuleger, Aaron J. Rositch, Robert K. Sollenskog
  • Patent number: 11135890
    Abstract: A damper assembly for a vehicle suspension system includes a first damper and a second damper. The second damper includes a housing having a wall that at least partially surrounds at least a portion of the first damper, the volume between the wall and the first damper defining a chamber, and the wall defines an aperture. The second damper also includes a piston positioned within the chamber, a conduit defining a flow path that includes the aperture, and a flow control device disposed along the flow path. The second damper is configured to provide a damping force that varies based on the position of the piston within the chamber.
    Type: Grant
    Filed: July 15, 2019
    Date of Patent: October 5, 2021
    Assignee: Oshkosh Defense, LLC
    Inventors: Erik S. Ellifson, Patrick S. Dillman, Jason J. Zuleger, Aaron J. Rositch, Robert K. Sollenskog
  • Publication number: 20210229515
    Abstract: A suspension element includes a main body having an internal volume, a tubular element extending at least partially within the main body, the main body and the tubular element each including a sidewall having an inner surface and an outer surface, a first piston assembly separating the internal volume of the main body into a first chamber and a second chamber, the second chamber defined by the outer surface of the tubular element, the inner surface of the main body, and a surface of the first piston assembly, and a second piston assembly including a side that is directly exposed to the first chamber. The sidewall of the main body defines an aperture therethrough that forms a portion of a flow path between the first chamber and the second chamber. The first piston assembly is configured to prevent direct fluid communication between the first chamber and the second chamber.
    Type: Application
    Filed: April 12, 2021
    Publication date: July 29, 2021
    Applicant: Oshkosh Defense, LLC
    Inventors: Patrick S. Dillman, Robert K. Sollenskog, Erik Ellifson, Aaron J. Rositch
  • Patent number: 10974561
    Abstract: A suspension element includes a main body having an internal volume configured to contain a liquid therein, a tubular element extending at least partially within the main body, the tubular element having an internal volume that defines a first fluid chamber configured to contain a compressible gas therein, a first piston separating the internal volume of the main body into a second fluid chamber and a third fluid chamber, a second piston positioned to separate the first fluid chamber from the second fluid chamber, and a flow control element disposed along a flow path between the second fluid chamber and the third fluid chamber. Movement of the tubular element generates a flow of the liquid through the flow control element to produce a damping force and changes the pressure of the compressible gas to produce a spring force.
    Type: Grant
    Filed: June 24, 2019
    Date of Patent: April 13, 2021
    Assignee: Oshkosh Defense, LLC
    Inventors: Patrick S. Dillman, Robert K. Sollenskog, Erik Ellifson, Aaron J. Rositch
  • Publication number: 20200062071
    Abstract: A valve assembly for a vehicle suspension system includes a valve body, a first flow controller, a first plunger, a second flow controller, and a second plunger. The valve body defines a first inlet port, a first outlet port, a first chamber connected to the first inlet port and the first outlet port, a second chamber, a second inlet port, a second outlet port, a third chamber connected to the second inlet port and the second outlet port, and a fourth chamber. The first flow controller is positioned within the first chamber. The first plunger is positioned between the first chamber and the second chamber. The second flow controller is positioned within the third chamber. The second plunger is positioned between the third chamber and the fourth chamber.
    Type: Application
    Filed: November 4, 2019
    Publication date: February 27, 2020
    Applicant: Oshkosh Defense, LLC
    Inventors: Jason J. Zuleger, Robert K. Sollenskog
  • Publication number: 20190337350
    Abstract: A damper assembly for a vehicle suspension system includes a first damper and a second damper. The second damper includes a housing having a wall that at least partially surrounds at least a portion of the first damper, the volume between the wall and the first damper defining a chamber, and the wall defines an aperture. The second damper also includes a piston positioned within the chamber, a conduit defining a flow path that includes the aperture, and a flow control device disposed along the flow path. The second damper is configured to provide a damping force that varies based on the position of the piston within the chamber.
    Type: Application
    Filed: July 15, 2019
    Publication date: November 7, 2019
    Applicant: Oshkosh Defense, LLC
    Inventors: Erik S. Ellifson, Patrick S. Dillman, Jason J. Zuleger, Aaron J. Rositch, Robert K. Sollenskog
  • Patent number: 10464389
    Abstract: A valve assembly includes a housing, a flow controller, and a piston. The housing defines an inlet port, an outlet port, a flow path extending between the inlet port and the outlet port, and a pilot chamber configured to be in fluid communication with a pilot. The flow controller is positioned along the flow path. The piston is positioned to separate the pilot chamber from the flow path. The piston includes a first end in fluid communication with the pilot chamber and an opposing second end positioned to engage the flow controller with a pilot force that varies based on a pressure at the pilot.
    Type: Grant
    Filed: June 5, 2017
    Date of Patent: November 5, 2019
    Assignee: Oshkosh Defense, LLC
    Inventors: Jason J. Zuleger, Robert K. Sollenskog
  • Publication number: 20190308480
    Abstract: A suspension element includes a main body having an internal volume configured to contain a liquid therein, a tubular element extending at least partially within the main body, the tubular element having an internal volume that defines a first fluid chamber configured to contain a compressible gas therein, a first piston separating the internal volume of the main body into a second fluid chamber and a third fluid chamber, a second piston positioned to separate the first fluid chamber from the second fluid chamber, and a flow control element disposed along a flow path between the second fluid chamber and the third fluid chamber. Movement of the tubular element generates a flow of the liquid through the flow control element to produce a damping force and changes the pressure of the compressible gas to produce a spring force.
    Type: Application
    Filed: June 24, 2019
    Publication date: October 10, 2019
    Applicant: Oshkosh Defense, LLC
    Inventors: Patrick S. Dillman, Robert K. Sollenskog, Erik Ellifson, Aaron J. Rositch
  • Patent number: 10369860
    Abstract: A damper assembly for a vehicle suspension system includes a primary damper and a secondary damper. The secondary damper includes a housing having a wall that at least partially surrounds at least a portion of the primary damper, the volume between the wall and the primary damper defining a chamber, and the wall defines an aperture. The secondary damper also includes a piston positioned within the chamber, a conduit defining a flow path that includes the aperture, and a valve disposed along the flow path. The secondary damper is configured to provide a damping force that varies based on the position of the piston within the chamber.
    Type: Grant
    Filed: November 6, 2017
    Date of Patent: August 6, 2019
    Assignee: Oshkosh Corporation
    Inventors: Erik S. Ellifson, Patrick S. Dillman, Jason J. Zuleger, Aaron J. Rositch, Robert K. Sollenskog
  • Patent number: 10350956
    Abstract: A suspension element includes a main body having an internal volume configured to contain a liquid therein, a tubular element extending at least partially within the main body, the tubular element having an internal volume that defines a first fluid chamber configured to contain a compressible gas therein, a first piston separating the internal volume of the main body into a second fluid chamber and a third fluid chamber, a second piston positioned to separate the first fluid chamber from the second fluid chamber, and a flow control element disposed along a flow path between the second fluid chamber and the third fluid chamber. Movement of the tubular element generates a flow of the liquid through the flow control element to produce a damping force and changes the pressure of the compressible gas to produce a spring force.
    Type: Grant
    Filed: April 16, 2018
    Date of Patent: July 16, 2019
    Assignee: Oshkosh Defense, LLC
    Inventors: Patrick S. Dillman, Robert K. Sollenskog, Erik Ellifson, Aaron J. Rositch
  • Publication number: 20180229569
    Abstract: A suspension element includes a main body having an internal volume configured to contain a liquid therein, a tubular element extending at least partially within the main body, the tubular element having an internal volume that defines a first fluid chamber configured to contain a compressible gas therein, a first piston separating the internal volume of the main body into a second fluid chamber and a third fluid chamber, a second piston positioned to separate the first fluid chamber from the second fluid chamber, and a flow control element disposed along a flow path between the second fluid chamber and the third fluid chamber. Movement of the tubular element generates a flow of the liquid through the flow control element to produce a damping force and changes the pressure of the compressible gas to produce a spring force.
    Type: Application
    Filed: April 16, 2018
    Publication date: August 16, 2018
    Applicant: Oshkosh Defense, LLC
    Inventors: Patrick S. Dillman, Robert K. Sollenskog, Erik Ellifson, Aaron J. Rositch
  • Patent number: 9944145
    Abstract: A suspension element includes a main body having an internal volume configured to contain a liquid therein, a tubular element extending at least partially within the main body, the tubular element having an internal volume that defines a first fluid chamber configured to contain a compressible gas therein, a first piston separating the internal volume of the main body into a second fluid chamber and a third fluid chamber, a second piston positioned to separate the first fluid chamber from the second fluid chamber, and a flow control element disposed along a flow path between the second fluid chamber and the third fluid chamber. Movement of the tubular element generates a flow of the liquid through the flow control element to produce a damping force and changes the pressure of the compressible gas to produce a spring force.
    Type: Grant
    Filed: April 10, 2015
    Date of Patent: April 17, 2018
    Assignee: Oshkosh Defense, LLC
    Inventors: Patrick S. Dillman, Robert K. Sollenskog, Erik Ellifson, Aaron J. Rositch
  • Publication number: 20180056746
    Abstract: A damper assembly for a vehicle suspension system includes a primary damper and a secondary damper. The secondary damper includes a housing having a wall that at least partially surrounds at least a portion of the primary damper, the volume between the wall and the primary damper defining a chamber, and the wall defines an aperture. The secondary damper also includes a piston positioned within the chamber, a conduit defining a flow path that includes the aperture, and a valve disposed along the flow path. The secondary damper is configured to provide a damping force that varies based on the position of the piston within the chamber.
    Type: Application
    Filed: November 6, 2017
    Publication date: March 1, 2018
    Applicant: Oshkosh Defense, LLC
    Inventors: Erik S. Ellifson, Patrick S. Dillman, Jason J. Zuleger, Aaron J. Rositch, Robert K. Sollenskog
  • Patent number: 9809080
    Abstract: A damper assembly for a vehicle suspension system includes a primary damper and a secondary damper. The secondary damper includes a housing having a wall that at least partially surrounds at least a portion of the primary damper, the volume between the wall and the primary damper defining a chamber, and the wall defines an aperture. The secondary damper also includes a piston positioned within the chamber, a conduit defining a flow path that includes the aperture, and a valve disposed along the flow path. The primary damper is configured to provide a base damping force and the secondary damper is configured to provide a supplemental damping force that varies based on the position of the piston within the chamber.
    Type: Grant
    Filed: February 19, 2016
    Date of Patent: November 7, 2017
    Assignee: Oshkosh Defense, LLC
    Inventors: Erik S. Ellifson, Patrick S. Dillman, Jason J. Zuleger, Aaron J. Rositch, Robert K. Sollenskog
  • Publication number: 20170267052
    Abstract: A valve assembly includes a housing, a flow controller, and a piston. The housing defines an inlet port, an outlet port, a flow path extending between the inlet port and the outlet port, and a pilot chamber configured to be in fluid communication with a pilot. The flow controller is positioned along the flow path. The piston is positioned to separate the pilot chamber from the flow path. The piston includes a first end in fluid communication with the pilot chamber and an opposing second end positioned to engage the flow controller with a pilot force that varies based on a pressure at the pilot.
    Type: Application
    Filed: June 5, 2017
    Publication date: September 21, 2017
    Applicant: Oshkosh Defense, LLC
    Inventors: Jason J. Zuleger, Robert K. Sollenskog