Patents by Inventor Bernd Schraff

Bernd Schraff 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: 9518567
    Abstract: An adjusting device of an axial piston machine having a displacement volume that is adjusted by a pivoting yoke. The adjusting device has a cylinder, which is radially spaced from and tangential to the yoke pivot axis. A piston communicates with the yoke and is adjusted by hydraulic pressure change. A control arrangement has a position regulating valve with a control piston which can set the hydraulic pressure acting on the piston. A mechanical return can transfer the yoke pivoting position to the control piston. The valve is axially parallel to the cylinder and radially spaced from the yoke pivot axis. The return comprises an axially movable sensing piston and coaxial return spring which are axially adjacent to the valve. The sensing piston abuts a yoke surface that is eccentric with respect to the pivot axis and connected to the control piston by the return spring.
    Type: Grant
    Filed: February 2, 2012
    Date of Patent: December 13, 2016
    Assignee: ZF Friedrichshafen AG
    Inventors: Udo Brehmer, Bernd Schraff, Roland Rehtanz
  • Publication number: 20140000449
    Abstract: An adjusting device of an axial piston machine having a displacement volume that is adjusted by a pivoting yoke. The adjusting device has a cylinder, which is radially spaced from and tangential to the yoke pivot axis. A piston communicates with the yoke and is adjusted by hydraulic pressure change. A control arrangement has a position regulating valve with a control piston which can set the hydraulic pressure acting on the piston. A mechanical return can transfer the yoke pivoting position to the control piston. The valve is axially parallel to the cylinder and radially spaced from the yoke pivot axis. The return comprises an axially movable sensing piston and coaxial return spring which are axially adjacent to the valve. The sensing piston abuts a yoke surface that is eccentric with respect to the pivot axis and connected to the control piston by the return spring.
    Type: Application
    Filed: February 2, 2012
    Publication date: January 2, 2014
    Applicant: ZF Friedrichshafen AG
    Inventors: Udo Brehmer, Bernd Schraff, Roland Rehtanz