Patents by Inventor Robert J. Klinkel

Robert J. Klinkel 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).

  • Low input torque rotor for vane pump
    Patent number: 7467935
    Abstract: A vane-type fluid displacement unit having a housing, a drive shaft extending through the housing, a rotor secured to the drive shaft and disposed within the housing, the rotor having at least one non-smooth top or bottom surface, and at least one vane secured to the rotor.
    Type: Grant
    Filed: September 17, 2004
    Date of Patent: December 23, 2008
    Assignee: Sauer-Danfoss, Inc.
    Inventors: Michael A Betz, Eric D Bretey, Robert J Klinkel, Kevin J Landhuis
  • Closed cavity piston for hydrostatic power units and method of manufacturing the same
    Patent number: 6994014
    Abstract: Disclosed is a closed cavity piston made from a metal injection molding process. The piston has an elongated cylindrical body with a first end that is adapted to receive a slipper. The piston also has at least one hollow compartment and a hollow stem that transports hydraulic fluid. After the metal injection molding process an end cap having a central opening is sinterbonded to the second end of the body. The central opening aligns with the hollow stem to provide a fluid outlet.
    Type: Grant
    Filed: June 29, 2004
    Date of Patent: February 7, 2006
    Assignee: Sauer-Danfoss Inc.
    Inventors: Daryl I. Rober, Michael A. Betz, Robert J. Klinkel
  • Hydrostatic cylinder block and method of making the same
    Patent number: 6802244
    Abstract: A method of making a cylinder block for a rotatable hydrostatic power member by separating the cylinder block into its four geometries and joining them together. The geometries include a base plate having a center opening and a arcuate kidney-shaped openings uniformly spaced radially around the center opening. The second geometrical item is a grooved drive shaft that fits into the center opening of the base plate. The third member is a group of tubular bore elements that fit in the base plate and mate with the drive shaft. The final member is a torque ring that matingly fits over the tubular piston bore elements.
    Type: Grant
    Filed: April 25, 2003
    Date of Patent: October 12, 2004
    Assignee: Sauer-Danfoss, Inc.
    Inventors: Robert J. Stoppek, David Dirks, Robert J. Klinkel
  • Housing for a rotary hydraulic unit with a servo piston
    Patent number: 6715997
    Abstract: A variable displacement hydraulic power unit has a housing and a rotating piston block with a rotatable axis and a servo piston bore having a reciprocal piston therein with the bore extending in a direction parallel to the rotatable axis of the rotating piston block. The housing and servo piston each have adjacent open ends. A single integral cover is attached to the housing to cover close and close the open ends of both the housing and the piston bore.
    Type: Grant
    Filed: April 19, 2002
    Date of Patent: April 6, 2004
    Assignee: Sauer-Danfoss Inc.
    Inventors: Stephen C. Frantz, Robert J. Klinkel
  • Axial servo control
    Publication number: 20020157530
    Abstract: A variable displacement hydraulic power unit has a housing and a rotating piston block with a rotatable axis and a servo piston bore having a reciprocal piston therein with the bore extending in a direction parallel to the rotatable axis of the rotating piston block. The housing and servo piston each have adjacent open ends. A single integral cover is attached to the housing to cover close and close the open ends of both the housing and the piston bore.
    Type: Application
    Filed: April 19, 2002
    Publication date: October 31, 2002
    Applicant: Sauer-Danfoss Inc.
    Inventors: Stephen C. Frantz, Robert J. Klinkel