Patents by Inventor Bernard J. Strehlow

Bernard J. Strehlow 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).

  • Power transfer unit with breakout friction reduction and leakage reduction
    Patent number: 11905980
    Abstract: A power transfer unit includes a first hydraulic circuit, a second hydraulic circuit fluidly connected to the first hydraulic circuit, a pump and motor assembly fluidly connected between the first hydraulic circuit and the second hydraulic circuit, an isolation valve arranged along the first hydraulic circuit and fluidly connected to an inlet of the pump and motor assembly. The isolation valve is movable between a closed position and an open position to prevent and enable high-pressure fluid flow to the inlet, respectively. An unloader valve is arranged along the second hydraulic circuit and fluidly connected to an outlet of the pump and motor assembly, and an orifice is arranged along the second hydraulic circuit and fluidly connected to the unloader valve to reduce back pressure in the second hydraulic circuit.
    Type: Grant
    Filed: May 26, 2020
    Date of Patent: February 20, 2024
    Assignee: Parker-Hannifin Corporation
    Inventors: Steven A. Krane, Dean R. Pollee, Scott N. Johns, David A. Scranton, Bernard J. Strehlow
  • POWER TRANSFER UNIT WITH BREAKOUT FRICTION REDUCTION AND LEAKAGE REDUCTION
    Publication number: 20220228609
    Abstract: A power transfer unit includes a first hydraulic circuit, a second hydraulic circuit fluidly connected to the first hydraulic circuit, a pump and motor assembly fluidly connected between the first hydraulic circuit and the second hydraulic circuit, an isolation valve arranged along the first hydraulic circuit and fluidly connected to an inlet of the pump and motor assembly. The isolation valve is movable between a closed position and an open position to prevent and enable high-pressure fluid flow to the inlet, respectively. An unloader valve is arranged along the second hydraulic circuit and fluidly connected to an outlet of the pump and motor assembly, and an orifice is arranged along the second hydraulic circuit and fluidly connected to the unloader valve to reduce back pressure in the second hydraulic circuit.
    Type: Application
    Filed: May 26, 2020
    Publication date: July 21, 2022
    Inventors: Steven A. Krane, Dean R. Pollee, Scott N. Johns, David A. Scranton, Bernard J. Strehlow
  • Hydrostatic bearing arrangement for pump swashplate having secondary angle
    Patent number: 7757598
    Abstract: A hydraulic axial piston pump is designed with a secondary swashplate angle for providing improved performance and life. The secondary swashplate angle produces a sideload on the swashplate that is reacted by the pump's housing. A hydrostatically balanced thrust bearing is used to counteract the sideload produced by the secondary swashplate angle. The bearing design includes a tiltable pad or shoe supplied with pressurized fluid from the pump's discharge port. The same fluid that supplies the tiltable pad may also supply the pump's cradle bearings.
    Type: Grant
    Filed: October 29, 2008
    Date of Patent: July 20, 2010
    Assignee: Parker-Hannifin Corporation
    Inventors: Matthew H. Simon, Bernard J. Strehlow
  • HYDROSTATIC BEARING ARRANGEMENT FOR PUMP SWASHPLATE HAVING SECONDARY ANGLE
    Publication number: 20090110564
    Abstract: A hydraulic axial piston pump is designed with a secondary swashplate angle for providing improved performance and life. The secondary swashplate angle produces a sideload on the swashplate that is reacted by the pump's housing. A hydrostatically balanced thrust bearing is used to counteract the sideload produced by the secondary swashplate angle. The bearing design includes a tiltable pad or shoe supplied with pressurized fluid from the pump's discharge port. The same fluid that supplies the tiltable pad may also supply the pump's cradle bearings.
    Type: Application
    Filed: October 29, 2008
    Publication date: April 30, 2009
    Inventors: Matthew H. Simon, Bernard J. Strehlow