Patents by Inventor Thomas L. Nahrwold

Thomas L. Nahrwold 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: 20210253101
    Abstract: Methods and systems for operating axles of a vehicle are provided. In one example, a propulsion source of a first axle is operated in a torque control mode at a first torque and a propulsion source of a second axle is operated in a torque control mode at a second torque. Torque of the propulsion sources may be adjusted as a function of steering angle.
    Type: Application
    Filed: February 19, 2020
    Publication date: August 19, 2021
    Inventor: Thomas L. NAHRWOLD
  • Publication number: 20210252983
    Abstract: Methods and systems for operating axles of a vehicle are provided. In one example, relationships between accelerator pedal position and driver demand torque may be adjusted as a function of a vehicle's geographical location. Further, a relationship between brake pedal position and requested braking amount may be adjusted as a function of a vehicle's geographical location.
    Type: Application
    Filed: February 19, 2020
    Publication date: August 19, 2021
    Inventors: Thomas L. NAHRWOLD, Amar NIVARTHI
  • Publication number: 20210252976
    Abstract: Methods and systems for operating axles of a vehicle are provided. In one example, a propulsion source of a first axle is operated in a speed control mode at a first speed and a propulsion source of a second axle is operated in a speed control mode at a second speed. The propulsion sources are operated at different speeds to reduce a turning radius of a vehicle.
    Type: Application
    Filed: February 19, 2020
    Publication date: August 19, 2021
    Inventor: Thomas L. NAHRWOLD
  • Patent number: 10995836
    Abstract: A drive unit assembly. The drive unit includes a motor drivingly connected to a motor output shaft which in turn is drivingly connected to a sun gear of a gear assembly. The gear assembly further includes a gear assembly housing, one or more planetary gears and a pinion gear. At least a portion of the one or more planetary gears are drivingly connected to the sun gear, the gear assembly housing and a plurality of gear teeth circumferentially extending from an inner surface of a drive unit housing. The pinion gear has a first side and a second side, where the second side of the pinion gear is integrally connected to a first end portion of the gear assembly housing. Drivingly connected to the pinion gear is a differential ring gear of a differential assembly having a first side gear, a second side gear and one or more bevel gears.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: May 4, 2021
    Assignee: Dana Automotive Systems Group, LLC
    Inventors: Ken E. Cooper, Thomas L. Nahrwold
  • Publication number: 20210123363
    Abstract: An axle assembly including a disconnect assembly and an integrated fluid flow system. The disconnect assembly including an axially movable clutch member in selective engagement with at least one shaft to permit a rotation thereof. The fluid flow system includes a fluid flow member and a plurality of fluid passageways to permit a flow of a fluid (e.g. a lubricant) from a fluid source (e.g. a fluid sump of the axle assembly) to various components disposed within a carrier housing of the axle assembly and a return of the fluid back to the fluid source.
    Type: Application
    Filed: October 24, 2019
    Publication date: April 29, 2021
    Inventors: Sajeev C. Krishnan, Brian S. Longardner, Nicholas C. Billmaier, Thomas L. Nahrwold, Astha Barve, Robin Dominiak
  • Patent number: 10968793
    Abstract: An axle assembly including a disconnect assembly and an integrated fluid flow system. The disconnect assembly including an axially movable clutch member in selective engagement with at least one shaft to permit a rotation thereof. The fluid flow system includes a fluid flow member and a plurality of fluid passageways to permit a flow of a fluid (e.g. a lubricant) from a fluid source (e.g. a fluid sump of the axle assembly) to various components disposed within a carrier housing of the axle assembly and a return of the fluid back to the fluid source.
    Type: Grant
    Filed: October 24, 2019
    Date of Patent: April 6, 2021
    Assignee: Dana Automotive Systems Group, LLC
    Inventors: Sajeev C. Krishnan, Brian S. Longardner, Nicholas C. Billmaier, Thomas L. Nahrwold, Astha Barve, Robin Dominiak
  • Patent number: 10935089
    Abstract: A method of detecting a ball loss condition in a ball and ramp assembly. The method includes providing a drive unit having one or more clutch pack assemblies, one or more motors with a motor output shaft and one or more ball and ramp assemblies. One or more actuation profiles are ran by the motors and an amount of motor current used and a position of the output shaft of the motor is measured during the running of actuation profiles. One or more motor current vs. motor output shaft position plots are generated having one or more characteristic curves based on the amount of current measured and the position of the output shaft measured. The amount of motor current is compared to the motor current of characteristic curve at a given output shaft position and based on that comparison a ball loss condition is identified.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: March 2, 2021
    Assignee: Dana Automotive Systems Group, LLC
    Inventors: Thomas L. Nahrwold, Jeroen Volckaert
  • Patent number: 10808829
    Abstract: An axle assembly for a vehicle includes an axle housing having at least one axle shaft and a flow control member disposed therein. The flow control member is interposed between the at least one axle shaft and the axle housing. The flow control member includes a hollow cylindrical main body having at least one surface irregularity formed on an outer surface thereof that cooperates with the inner surface of the housing to form at least one fluid flow path configured to receive a fluid therein.
    Type: Grant
    Filed: December 21, 2018
    Date of Patent: October 20, 2020
    Assignee: DANA AUTOMOTIVE SYSTEMS GROUP, LLC
    Inventors: Thomas L. Nahrwold, Brian E. Sitterly
  • Publication number: 20200200258
    Abstract: An axle assembly for a vehicle includes an axle housing having at least one axle shaft and a flow control member disposed therein. The flow control member is interposed between the at least one axle shaft and the axle housing. The flow control member includes a hollow cylindrical main body having at least one surface irregularity formed on an outer surface thereof that cooperates with the inner surface of the housing to form at least one fluid flow path configured to receive a fluid therein.
    Type: Application
    Filed: December 21, 2018
    Publication date: June 25, 2020
    Inventors: Thomas L. Nahrwold, Brian E. Sitterly
  • Publication number: 20200116214
    Abstract: A method of detecting a ball loss condition in a ball and ramp assembly. The method includes providing a drive unit having one or more clutch pack assemblies, one or more motors with a motor output shaft and one or more ball and ramp assemblies. One or more actuation profiles are ran by the motors and an amount of motor current used and a position of the output shaft of the motor is measured during the running of actuation profiles. One or more motor current vs. motor output shaft position plots are generated having one or more characteristic curves based on the amount of current measured and the position of the output shaft measured. The amount of motor current is compared to the motor current of characteristic curve at a given output shaft position and based on that comparison a ball loss condition is identified.
    Type: Application
    Filed: December 21, 2017
    Publication date: April 16, 2020
    Applicant: DANA AUTOMOTIVE SYSTEMS GROUP, LLC
    Inventors: THOMAS L. NAHRWOLD, JEROEN VOLCKAERT
  • Publication number: 20190376564
    Abstract: A fluid distribution apparatus for an axle assembly, the fluid distribution apparatus including a cylindrical portion rotatably disposed about a bearing race. A conical portion is coupled with the cylindrical portion, and a retaining portion is coupled with the conical portion. A plurality of circumferentially spaced tubes are coupled with the retaining portion, wherein the tubes are at least partially disposed through a rotating component of a clutch.
    Type: Application
    Filed: June 4, 2019
    Publication date: December 12, 2019
    Inventors: Nicholas C. Billmaier, Thomas L. Nahrwold
  • Patent number: 10473168
    Abstract: A ball and ramp assembly including a first plate, a second plate and one or more rolling elements between the first and second plates. The first plate includes a shoulder portion that extends from a first side of the first plate. Additionally, the first plate includes an increased diameter portion that extends from an outer surface of the first plate. Extending inward from a second side of the first plate is a receiving portion with a substantially vertical wall portion having one or more non-circular first plate grooves. The second plate has one or more non-circular second plate grooves that extend along a first side of the second plate. The second plate grooves are a reverse mirror image of the first plate grooves. Radially outboard from the shoulder portion is a thrust bearing and integrally connected to the outer surface of the first plate is a first plate gear portion.
    Type: Grant
    Filed: September 12, 2017
    Date of Patent: November 12, 2019
    Assignee: Dana Automotive System Group, LLC
    Inventors: Thomas L. Nahrwold, Scott A. Smith
  • Publication number: 20190309838
    Abstract: A drive unit assembly. The drive unit includes a motor drivingly connected to a motor output shaft which in turn is drivingly connected to a sun gear of a gear assembly. The gear assembly further includes a gear assembly housing, one or more planetary gears and a pinion gear. At least a portion of the one or more planetary gears are drivingly connected to the sun gear, the gear assembly housing and a plurality of gear teeth circumferentially extending from an inner surface of a drive unit housing. The pinion gear has a first side and a second side, where the second side of the pinion gear is integrally connected to a first end portion of the gear assembly housing. Drivingly connected to the pinion gear is a differential ring gear of a differential assembly having a first side gear, a second side gear and one or more bevel gears.
    Type: Application
    Filed: November 30, 2017
    Publication date: October 10, 2019
    Inventors: KENNETH E. COOPER, THOMAS L. NAHRWOLD
  • Patent number: 10012299
    Abstract: A limited slip differential system having a differential housing, a differential case disposed within the differential housing and a differential gear set supported within the differential case. A friction clutch assembly including a clutch pack is positioned within the differential case and axially adjacent the differential gear set. A ball and ramp assembly is positioned outside the differential case and includes a reaction member positioned within and fixed to the differential housing. A differential bearing is positioned axially between the reaction member and the differential housing and radially outward from the differential case. A singular thrust bearing is located within the differential housing and outside the differential case and applies an axial load from the actuator assembly to the clutch pack.
    Type: Grant
    Filed: October 11, 2016
    Date of Patent: July 3, 2018
    Assignee: Dana Automotive Systems Group, LLC
    Inventors: Kenneth E. Cooper, Thomas L. Nahrwold
  • Publication number: 20180080508
    Abstract: A ball and ramp assembly including a first plate, a second plate and one or more rolling elements between the first and second plates. The first plate includes a shoulder portion that extends from a first side of the first plate. Additionally, the first plate includes an increased diameter portion that extends from an outer surface of the first plate. Extending inward from a second side of the first plate is a receiving portion with a substantially vertical wall portion having one or more non-circular first plate grooves. The second plate has one or more non-circular second plate grooves that extend along a first side of the second plate. The second plate grooves are a reverse mirror image of the first plate grooves. Radially outboard from the shoulder portion is a thrust bearing and integrally connected to the outer surface of the first plate is a first plate gear portion.
    Type: Application
    Filed: September 12, 2017
    Publication date: March 22, 2018
    Inventors: Thomas L. Nahrwold, Scott A. Smith
  • Patent number: 9885415
    Abstract: An axle assembly for a vehicle including a differential carrier having a first portion and a second portion. The first portion including a first engagement surface coupled with a second engagement surface of the second portion. The differential carrier defines a differential area and a clutch area substantially separated by a partition. The differential carrier first engagement surface defines a lubricant channel fluidly connecting the differential area with the clutch area, and at least partially located above the clutch area and at least partially located in an outer wall of the differential carrier. The axle assembly further includes a bearing retainer disposed through the outer wall of the differential carrier. The bearing retainer includes an aperture therethrough, fluidly connecting the lubricant channel with a clutch assembly.
    Type: Grant
    Filed: June 24, 2016
    Date of Patent: February 6, 2018
    Assignee: Dana Automotive Systems Group, LLC
    Inventors: Thomas L. Nahrwold, Randy L. Sommer
  • Publication number: 20170108103
    Abstract: A limited slip differential system having a differential housing, a differential case disposed within the differential housing and a differential gear set supported within the differential case. A friction clutch assembly including a clutch pack is positioned within the differential case and axially adjacent the differential gear set. A ball and ramp assembly is positioned outside the differential case and includes a reaction member positioned within and fixed to the differential housing. A differential bearing is positioned axially between the reaction member and the differential housing and radially outward from the differential case. A singular thrust bearing is located within the differential housing and outside the differential case and applies an axial load from the actuator assembly to the clutch pack.
    Type: Application
    Filed: October 11, 2016
    Publication date: April 20, 2017
    Inventors: Kenneth E. Cooper, Thomas L. Nahrwold
  • Publication number: 20160377168
    Abstract: An axle assembly for a vehicle including a differential carrier having a first portion and a second portion. The first portion including a first engagement surface coupled with a second engagement surface of the second portion. The differential carrier defines a differential area and a clutch area substantially separated by a partition. The differential carrier first engagement surface defines a lubricant channel fluidly connecting the differential area with the clutch area, and at least partially located above the clutch area, and bending such that the lubricant channel is at least partially located in an outer wall of the differential carrier. The axle assembly further includes a bearing retainer disposed through the outer wall of the differential carrier. The bearing retainer includes an aperture therethrough, fluidly connecting the lubricant channel with a clutch assembly.
    Type: Application
    Filed: June 24, 2016
    Publication date: December 29, 2016
    Inventors: Thomas L. Nahrwold, Randy L. Sommer
  • Patent number: 7458911
    Abstract: A drive system designed to use a vehicle's existing hydraulic system to operate a controllable limited slip differential assembly. The limited slip differential assembly may be associated with the front axle, the rear axle, or the driveline between the front and rear axles. The differential assembly may also be used in combination that includes front, rear, or intermediate differential assemblies. The drive system further includes a friction clutch assembly for selectively engaging and disengaging an input member with an output member of the differential assembly, a fluid clutch actuator for selectively frictionally and variably loading the clutch assembly, and a fluid pump that is a common source of pressurized fluid for the fluid clutch actuator and the existing hydraulic system of the motor vehicle other than the fluid clutch actuator of the drive system. The fluid clutch actuator is actuated by fluid pressure generated by the fluid pump.
    Type: Grant
    Filed: July 22, 2005
    Date of Patent: December 2, 2008
    Assignee: Dana Automotive Systems Group, LLC
    Inventors: James A. Krisher, Kenneth E. Cooper, Thomas L. Nahrwold, Gordon W. Hunt, Ralph W. Baxter, Jr., Randy Sommer
  • Publication number: 20080227581
    Abstract: An axle assembly for a motor vehicle comprises an axle housing having a central axis and first and second openings formed through the axle housing opposite to each other, a carrier with a differential bearing support supporting a differential thereon for rotation about the central axis, and an abutment member attached to the axle housing adjacent to the first opening to extend substantially in a direction of the central axis. The carrier is fastened to the axle housing adjacent to the second opening therein. The abutment member engages the differential bearing support and absorbs a gear separating force imparted in operation by the differential and transmitted to the differential bearing support. Thus, the abutment member restrains deflection of the differential bearing support relative to the axle housing resulting from the gear separating force.
    Type: Application
    Filed: March 12, 2007
    Publication date: September 18, 2008
    Inventors: Michael J. Catalano, James A. Krisher, Thomas L. Nahrwold