Patents by Inventor Ludwig Friedsam

Ludwig Friedsam 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: 9027340
    Abstract: A brake booster with regenerative brake force generation comprising a force input element coupled to a brake pedal. A chamber arrangement having a vacuum chamber and a working chamber that are separated from one another by a movable wall. A control valve actuated in accordance with a displacement of the force input element. The working chamber is connectable selectively to the vacuum chamber and the atmosphere to generate and reduce a differential pressure at the movable wall. The control valve has a control valve housing that is connected for joint movement to the movable wall. In a first actuation phase of the brake booster from its rest position, the force input element is displaceable relative to the control valve housing by an idle travel, in which the control valve remains non-actuated to suppress a build-up of a differential pressure at the movable wall.
    Type: Grant
    Filed: June 16, 2009
    Date of Patent: May 12, 2015
    Assignee: Lucas Automotive GmbH
    Inventors: Ludwig Friedsam, Stefan Klöck
  • Publication number: 20110131973
    Abstract: The invention relates to a brake booster for an automotive brake system with regenerative brake force generation, comprising a force input element that may be or is coupled to a brake pedal, a chamber arrangement having a vacuum chamber and a working chamber that are separated from one another by a movable wall, a control valve, by means of which in accordance with a displacement of the force input element the working chamber is connectable selectively to the vacuum chamber and the atmosphere to generate and reduce a differential pressure at the movable wall, wherein the control valve has a control valve housing that is connected for joint movement to the movable wall In this case, it may be provided that in a first actuation phase of the brake booster from its rest position the force input element is displaceable relative to the control valve housing by an idle travel, in which the control valve remains non-actuated to suppress a build-up of a differential pressure at the movable wall.
    Type: Application
    Filed: June 16, 2009
    Publication date: June 9, 2011
    Inventors: Ludwig Friedsam, Stefan Klöck
  • Patent number: 7152405
    Abstract: A master cylinder for a vehicle hydraulic brake system has a housing with a bore formed therein, which is open at one end and in which a first pressure piston and a second pressure piston are guided sealingly and displaceably along an axis. Acting counter to an actuating direction upon the first pressure piston is a restrained first restoring spring and upon the second pressure piston a second restoring spring. In order, in a transportation or disassembly state of the master cylinder, to prevent the first pressure piston from being pressed excessively out of the bore, the second pressure piston is supported by means of a stop component counter to the actuating direction positively in the housing of the master cylinder.
    Type: Grant
    Filed: March 18, 2005
    Date of Patent: December 26, 2006
    Assignee: Lucas Automotive GmbH
    Inventors: Ludwig Friedsam, Martin Struschka, Michael Geider
  • Publication number: 20050229596
    Abstract: A master cylinder (10) for a vehicle hydraulic brake system has a housing (12) with a bore (14) formed therein, which is open at one end and in which a first pressure piston (16) and a second pressure piston (18) are guided sealingly and displaceably along an axis (A). Acting counter to an actuating direction (X) upon the first pressure piston (16) is a restrained first restoring spring (34) and upon the second pressure piston (18) a second restoring spring (52). In order, in a transportation or disassembly state of the master cylinder (10), to prevent the first pressure piston (16) from being pressed excessively out of the bore (14), the second pressure piston (18) is supported by means of a stop component (66) counter to the actuating direction (X) positively in the housing (12) of the master cylinder (10).
    Type: Application
    Filed: March 18, 2005
    Publication date: October 20, 2005
    Inventors: Ludwig Friedsam, Martin Struschka, Michael Geider
  • Patent number: 6672198
    Abstract: A vacuum brake booster (10) is described, having a vacuum chamber (16) and a working chamber (18) separated from one another by a movable wall (14), and a control valve (20), which comprises a housing (12) coupled workingly to the movable wall (14) and which to achieve a pressure difference at the movable wall (14) is capable of controlling the supply of atmospheric pressure or above-atmospheric pressure to the working chamber (18) in dependence upon the displacement of an actuating piston (28). The vacuum brake booster (10) has an emergency braking aid comprising a permanent magnet (38) and an armature (36), which cooperates with the permanent magnet (38) and is resiliently biased counter to actuating direction and during an emergency braking operation is drawn into abutment with the permanent magnet (38), with the result that the control valve (20) is held open for the supply of atmospheric pressure to the working chamber (18).
    Type: Grant
    Filed: April 30, 2003
    Date of Patent: January 6, 2004
    Assignee: Lucas Automotive GmbH
    Inventors: Ludwig Friedsam, Heinrich Plewnia, Gerd Puscher, Peter Schlüter
  • Publication number: 20030188632
    Abstract: A vacuum brake booster (10) is described, having a vacuum chamber (16) and a working chamber (18) separated from one another by a movable wall (14), and a control valve (20), which comprises a housing (12) coupled workingly to the movable wall (14) and which to achieve a pressure difference at the movable wall (14) is capable of controlling the supply of atmospheric pressure or above-atmospheric pressure to the working chamber (18) in dependence upon the displacement of an actuating piston (28). The vacuum brake booster (10) has an emergency braking aid comprising a permanent magnet (38) and an armature (36), which cooperates with the permanent magnet (38) and is resiliently biased counter to actuating direction and during an emergency braking operation is drawn into abutment with the permanent magnet (38), with the result that the control valve (20) is held open for the supply of atmospheric pressure to the working chamber (18).
    Type: Application
    Filed: April 30, 2003
    Publication date: October 9, 2003
    Inventors: Ludwig Friedsam, Heinrich Plewnia, Gerd Puscher, Peter Schluter
  • Patent number: 6505540
    Abstract: A control valve retaining element (22) for a brake booster (10) has a hollow cylindrical base member (28) and a first retaining collar (30), which is connected to the base member (28) and has at least one side wall for supporting a bellows end (20). To enable such a retaining element to be manufactured less expensively and positioned easily and securely on an actuating rod (16) of a brake booster (10), a second retaining collar (36) extends radially inwards from a first end of the base member (28) and in peripheral direction, wherein the second retaining collar (36) comprises a first lateral face (38) for cooperation with a stop (44) of the actuating rod (16) and a second lateral face (40) lying opposite the first lateral face (38) for cooperation with a compression spring (46).
    Type: Grant
    Filed: August 3, 2001
    Date of Patent: January 14, 2003
    Assignee: Lucas Industries plc
    Inventors: Peter Ortel, Ludwig Friedsam
  • Publication number: 20010052286
    Abstract: A control valve retaining element (22) for a brake booster (10) has a hollow cylindrical base member (28) and a first retaining collar (30), which is connected to the base member (28) and has at least one side wall for supporting a bellows end (20). To enable such a retaining element to be manufactured less expensively and positioned easily and securely on an actuating rod (16) of a brake booster (10), a second retaining collar (36) extends radially inwards from a first end of the base member (28) and in peripheral direction, wherein the second retaining collar (36) comprises a first lateral face (38) for cooperation with a stop (44) of the actuating rod (16) and a second lateral face (40) lying opposite the first lateral face (38) for cooperation with a compression spring (46).
    Type: Application
    Filed: August 3, 2001
    Publication date: December 20, 2001
    Inventors: Peter Ortel, Ludwig Friedsam