Patents by Inventor Stefan Haellgren

Stefan Haellgren 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).

  • Hydrostatic assembly
    Patent number: 9945462
    Abstract: A hydrostatic assembly employing a 1st hydraulic piston drive unit is described in which the output is increased without using additional servo assemblies by incorporating a 2nd hydraulic piston drive unit, coupling the drive shafts of both drive units together, and employing a common means to simultaneously adjust displacement of both the 1st and 2nd hydraulic piston drive units. In such embodiments, coupling the drive shafts together such that the 1st hydraulic piston drive unit is rotationally offset with respect to the 2nd hydraulic piston drive allows for a reduction in the amplitude of pressure pulsations associated with the hydrostatic assembly output, thereby smoothing out operation and improving durability.
    Type: Grant
    Filed: July 4, 2014
    Date of Patent: April 17, 2018
    Assignees: Parker-Hannifin Corporation, Kinetics Drive Solutions Inc.
    Inventors: Per-Ola Vallebrant, Stefan Haellgren, John Czepak, Gerald Dyck
  • HYDROSTATIC ASSEMBLY
    Publication number: 20160169357
    Abstract: A hydrostatic assembly employing a 1st hydraulic piston drive unit is described in which the output is increased without using additional servo assemblies by incorporating a 2nd hydraulic piston drive unit, coupling the drive shafts of both drive units together, and employing a common means to simultaneously adjust displacement of both the 1st and 2nd hydraulic piston drive units. In such embodiments, coupling the drive shafts together such that the 1st hydraulic piston drive unit is rotationally offset with respect to the 2nd hydraulic piston drive allows for a reduction in the amplitude of pressure pulsations associated with the hydrostatic assembly output, thereby smoothing out operation and improving durability.
    Type: Application
    Filed: July 4, 2014
    Publication date: June 16, 2016
    Inventors: Per-Ola Vallerant, Stefan Haellgren, John Czepak, Gerald Dyck