Patents by Inventor Andreas Krefeld

Andreas Krefeld 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: 10145437
    Abstract: Disclosed is a valve device for an air spring strut of an air suspension system of a motor vehicle, having a valve unit and a housing which receives the valve unit and has a bearing face for mounting a head bearing of the air spring strut on the valve device. The housing has a surface section for supporting the valve device in the air spring strut in a positively locking manner, with the result that a force which is exerted by the head bearing on the valve device can be introduced via the housing into the air spring strut. A supporting section is configured on the surface section of the housing, onto which supporting section an exchange element which can be disconnected from the housing can be arranged from the direction of a center longitudinal axis of the valve device for supporting on the housing in a positively locking manner.
    Type: Grant
    Filed: January 8, 2015
    Date of Patent: December 4, 2018
    Assignee: THYSSENKRUPP BILSTEIN GMBH
    Inventors: Andreas Krefeld, Damian Mrugalla
  • Publication number: 20160327115
    Abstract: Disclosed is a valve device for an air spring strut of an air suspension system of a motor vehicle, having a valve unit and a housing which receives the valve unit and has a bearing face for mounting a head bearing of the air spring strut on the valve device. The housing has a surface section for supporting the valve device in the air spring strut in a positively locking manner, with the result that a force which is exerted by the head bearing on the valve device can be introduced via the housing into the air spring strut. A supporting section is configured on the surface section of the housing, onto which supporting section an exchange element which can be disconnected from the housing can be arranged from the direction of a center longitudinal axis of the valve device for supporting on the housing in a positively locking manner.
    Type: Application
    Filed: January 8, 2015
    Publication date: November 10, 2016
    Applicant: ThyssenKrupp Bilstein GmbH
    Inventors: Andreas KREFELD, Damian MRUGALLA
  • Patent number: 7628256
    Abstract: A vibration damper providing amplitude-dependent damping for motor vehicles includes a first damping device including a piston rod which is disposed in a damping tube so as to be moveable in an oscillating manner and which supports a damping piston which divides the interior of the damping tube into a piston rod-side working chamber and a working chamber remote from the piston rod. The vibration damper further includes a second damping device which is disposed hydraulically parallel to the damping piston and includes an equalizing chamber which is divided into a first and a second partial chamber by a separating piston disposed so as to be axially displaceable in the equalizing chamber, wherein the first partial chamber is hydraulically connected to the piston rod-side working chamber and the second partial chamber is hydraulically connected to the working chamber remote from the piston rod.
    Type: Grant
    Filed: August 17, 2006
    Date of Patent: December 8, 2009
    Assignee: Thyssenkrupp Bilstein Suspension GmbH
    Inventor: Andreas Krefeld
  • Publication number: 20070039791
    Abstract: A vibration damper providing amplitude-dependent damping for motor vehicles includes a first damping device including a piston rod which is disposed in a damping tube so as to be moveable in an oscillating manner and which supports a damping piston which divides the interior of the damping tube into a piston rod-side working chamber and a working chamber remote from the piston rod. The vibration damper further includes a second damping device which is disposed hydraulically parallel to the damping piston and includes an equalizing chamber which is divided into a first and a second partial chamber by a separating piston disposed so as to be axially displaceable in the equalizing chamber, wherein the first partial chamber is hydraulically connected to the piston rod-side working chamber and the second partial chamber is hydraulically connected to the working chamber remote from the piston rod.
    Type: Application
    Filed: August 17, 2006
    Publication date: February 22, 2007
    Inventor: Andreas Krefeld