Patents by Inventor Hassan Asadi

Hassan Asadi 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: 9951839
    Abstract: A preloading device for a piston valve of a vibration damper includes a spring element which is fitted by an inner diameter onto a radially inner centering device which serves for inner centering of the spring element in the installed state of the preloading device. To provide a preloading device for a piston valve by which a reliable inner centering of a spring element can be ensured but which can be placed with low expenditure on assembly at the same time, the spring element is axially fixed at the centering device via retaining means in that the retaining means at least partially enclose the spring element axially on both sides and are rigidly connected to the centering device in each instance.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: April 24, 2018
    Assignee: ZF Friedrichshafen AG
    Inventors: Helmut Baalmann, Hassan Asadi, Hans Gonschorrek, Lothar Krill, Alexander Kruse, Oswald Lichtlein, Dirk Litterscheid, Thomas Manger, Heinz Sydekum, Harun Tucovic
  • Publication number: 20170009839
    Abstract: A vibration damper includes a piston rod (2) which transitions into a piston rod neck (4) while forming a contact shoulder (6) and guides a piston valve (1) at this piston rod neck (4), this piston valve (1) is pretensioned against the contact shoulder (6) of the piston rod (2). To reduce variances in damping force in batch fabrication of the vibration damper, a compensating disk (20) is fitted axially between the contact shoulder (6) and the piston valve (1), which compensating disk (20) is produced from a material with a lower yield strength compared to the piston rod (2) and/or compared to an immediately succeeding component of the piston valve (1).
    Type: Application
    Filed: December 17, 2014
    Publication date: January 12, 2017
    Applicant: ZF Friedrichshafen AG
    Inventors: Helmut BAALMANN, Hassan ASADI, Hans GONSCHORREK, Lothar KRILL, Alexander KRUSE, Oswald LICHTLEIN, Dirk LITTERSCHEID, Thomas MANGER, Harun TUCOVIC, Heinz SYDEKUM
  • Publication number: 20170002887
    Abstract: A preloading device for a piston valve of a vibration damper includes a spring element which is fitted by an inner diameter onto a radially inner centering device which serves for inner centering of the spring element in the installed state of the preloading device. To provide a preloading device for a piston valve by which a reliable inner centering of a spring element can be ensured but which can be placed with low expenditure on assembly at the same time, the spring element is axially fixed at the centering device via retaining means in that the retaining means at least partially enclose the spring element axially on both sides and are rigidly connected to the centering device in each instance.
    Type: Application
    Filed: December 17, 2014
    Publication date: January 5, 2017
    Inventors: Helmut BAALMANN, Hassan ASADI, Hans GONSCHORREK, Lothar KRILL, Alexander KRUSE, Oswald LICHTLEIN, Dirk LITTERSCHEID, Thomas MANGER, Heinz SYDEKUM, Harun TUCOVIC
  • Publication number: 20140027220
    Abstract: A separating piston for hydropneumatic units, separating a cylinder interior which is filled with liquid in a cylinder from a gas-filled compensation chamber or spring space in a sealing manner and which is formed of two parts and has a radially circumferential seal groove in which is arranged an annular seal which can tightly contact the inner wall of the cylinder. One of the two separating piston parts is a guide part which has characteristics conducive to sliding and which slides at the inner wall of the cylinder, and the other separating piston part is a retaining part which is connected to the guide part. The guide part is a stamped and/or bent sheet metal part which is coated with a guide or running layer at least on its guide area sliding along the inner wall of the cylinder.
    Type: Application
    Filed: July 25, 2013
    Publication date: January 30, 2014
    Inventors: Günther HANDKE, Thomas Thein, Hassan Asadi
  • Patent number: 7694786
    Abstract: Damping valve comprising a damping valve body with a through-channel system, which is covered on at least one outlet side by a number of valve disks, where a nonreturn valve disk releases an advance cross section when the damping medium is flowing in one direction and closes off that cross section when the damping medium is flowing in the other flow direction, and where a cover disk with at least one cross section which can be actuated by the nonreturn valve disk limits the lifting movement of the nonreturn valve disk, and where a second cover disk limits the lifting movement of the nonreturn valve disk in the direction opposite that in which the first cover disk works.
    Type: Grant
    Filed: November 4, 2004
    Date of Patent: April 13, 2010
    Assignee: ZF Friedrichshafen AG
    Inventors: Hassan Asadi, Harun Tucovic
  • Patent number: 7182190
    Abstract: A piston rod and a piston are installed with freedom of axial movement in a cylinder filled with a working medium, the piston dividing the working space into a space on the piston-rod side of the piston and a space on the side of the piston facing away from the piston rod. A stop disk is mounted on the piston rod in addition to the piston rests against a retainer provided on the cylinder to limit the outward movement of the piston rod during a fire.
    Type: Grant
    Filed: April 8, 2004
    Date of Patent: February 27, 2007
    Assignee: ZF Sachs AG
    Inventors: Hassan Asadi, Peter Wirth, Gerald Fenn, Björn Neumann
  • Patent number: 7121552
    Abstract: A piston ring includes a lateral surface which covers a circumferential surface of a piston and support segments with retaining surfaces which engage with the top and bottom of the piston. A piston ring joint allows the piston ring to be elastically deformed in the radial direction and is provided with a tongue at one end of the lateral surface, which tongue engages in an opening in the other end of the lateral surface. The tongue is designed with retaining segments which extend in the circumferential direction and continue as extensions of the support segments. The retaining segments engage supportively with the top and bottom of the piston. The opening is provided with carrier segments at least in certain areas of the circumference of the piston ring extensions of the support segments and holding the ends of the piston ring in place axially with respect to the piston, the carrier segments being supported in the axial direction of the piston on the retaining segments.
    Type: Grant
    Filed: December 4, 2003
    Date of Patent: October 17, 2006
    Assignee: ZF Sachs AG
    Inventors: Hassan Asadi, Gerald Fenn
  • Publication number: 20050092565
    Abstract: Damping valve comprising a damping valve body with a through-channel system, which is covered on at least one outlet side by a number of valve disks, where a nonreturn valve disk releases an advance cross section when the damping medium is flowing in one direction and closes off that cross section when the damping medium is flowing in the other flow direction, and where a cover disk with at least one cross section which can be actuated by the nonreturn valve disk limits the lifting movement of the nonreturn valve disk, and where a second cover disk limits the lifting movement of the nonreturn valve disk in the direction opposite that in which the first cover disk works.
    Type: Application
    Filed: November 4, 2004
    Publication date: May 5, 2005
    Inventors: Hassan Asadi, Harun Tucovic
  • Patent number: 6840153
    Abstract: Piston-cylinder unit comprising a cylinder in which a work space is filled with a work medium and which is limited by a closure and is sealed by at least one seal. The closure is fixed axially by a positive engagement with the cylinder up to a temperature threshold and the closure can carry out an axial movement for relieving pressure above the temperature threshold. A cutting device cancels the sealing function of the seal during the axial movement of the closure for relieving pressure.
    Type: Grant
    Filed: December 3, 2002
    Date of Patent: January 11, 2005
    Assignee: ZF Sachs AG
    Inventors: Peter Wirth, Wolfgang Bach, Hassan Asadi, Gerald Fenn, Hans Luksch
  • Publication number: 20040231935
    Abstract: A piston rod and a piston are installed with freedom of axial movement in a cylinder filled with a working medium, the piston dividing the working space into a space on the piston-rod side of the piston and a space on the side of the piston facing away from the piston rod. A stop disk is mounted on the piston rod in addition to the piston rests against retaining means provided on the cylinder to limit the outward movement of the piston rod during a fire.
    Type: Application
    Filed: April 8, 2004
    Publication date: November 25, 2004
    Applicant: ZF Sachs AG
    Inventors: Hassan Asadi, Peter Wirth, Gerald Fenn, Bjorn Neumann
  • Publication number: 20040221452
    Abstract: Method for the manufacture of a piston, wherein the piston comprises a piston body with through-channels for fluid which are covered by valve disks on support bodies with valve support surfaces, wherein the piston body is disk-shaped and is constructed in one piece by means of press stamping and, starting from a base body of the piston, the support bodies which are raised on one side of the piston are formed as recesses on the axially opposite side of the piston, and the piston has at least one support for the valve disks which is likewise pressed out of the piston base body on both sides of the piston, wherein the support of the piston body is formed from the piston body in a die tool by material flow against the pressing movement of a forming tool.
    Type: Application
    Filed: May 6, 2004
    Publication date: November 11, 2004
    Applicant: ZF Sachs AG
    Inventors: Peter Wirth, Gerald Fenn, Hassan Asadi
  • Publication number: 20040140624
    Abstract: A piston ring includes a lateral surface which covers a circumferential surface of a piston and support segments with retaining surfaces which engage with the top and bottom of the piston. A piston ring joint allows the piston ring to be elastically deformed in the radial direction and is provided with a tongue at one end of the lateral surface, which tongue engages in an opening in the other end of the lateral surface. The tongue is designed with retaining segments which extend in the circumferential direction and continue as extensions of the support segments. The retaining segments engage supportively with the top and bottom of the piston. The opening is provided with carrier segments at least in certain areas of the circumference of the piston ring extensions of the support segments and holding the ends of the piston ring in place axially with respect to the piston-, the carrier segments being supported in the axial direction of the piston on the retaining segments.
    Type: Application
    Filed: December 4, 2003
    Publication date: July 22, 2004
    Applicant: ZF Sachs AG
    Inventors: Hassan Asadi, Gerald Fenn
  • Patent number: 6719297
    Abstract: Piston ring including a covering surface which covers a circumferential surface of a piston, and supporting segments having retaining surfaces which engage the upper and lower sides of the piston. The piston ring has a butt joint which enables the piston ring to be elastically deformable radially, the butt joint being designed at one end of the covering surface with at least one tongue which engages in a cutout in the other end of the covering surface. The tongue is designed with at least one retaining segment which runs in the circumferential direction and engages in a supporting manner in each case on the upper and lower side of the piston.
    Type: Grant
    Filed: August 27, 2001
    Date of Patent: April 13, 2004
    Assignee: Mannesmann Sachs AG
    Inventors: Gerald Fenn, Hassan Asadi, Matthias Höhn, Peter Wirth
  • Patent number: 6634379
    Abstract: Switching valve with a valve body, which separates two working spaces filled with a fluid. The valve body has pass-through openings which are covered except for an inlet cross-section, where the inlet cross-section is controlled by a switching disk as a function of the direction of flow in the switching valve. Between the switching disk and the inlet cross-section, at least one spacer disk is provided, which has at least one opening, which communicates with the inlet cross-section, where the opening has a larger two-dimensional area than the inlet cross-section.
    Type: Grant
    Filed: November 21, 2001
    Date of Patent: October 21, 2003
    Assignee: Mannesmann Sachs AG
    Inventors: Hassan Asadi, Gerald Fenn, Hans Luksch
  • Publication number: 20030110942
    Abstract: Piston-cylinder unit comprising a cylinder in which a work space is filled with a work medium and which is limited by a closure and is sealed by at least one seal. The closure is fixed axially by a positive engagement with the cylinder up to a temperature threshold and the closure can carry out an axial movement for relieving pressure above the temperature threshold. A cutting device cancels the sealing function of the seal during the axial movement of the closure for relieving pressure.
    Type: Application
    Filed: December 3, 2002
    Publication date: June 19, 2003
    Applicant: ZF Sachs AG
    Inventors: Peter Wirth, Wolfgang Bach, Hassan Asadi, Gerald Fenn, Hans Luksch
  • Patent number: 6540052
    Abstract: Damping-valve body, in particular for a piston-cylinder unit filled with damping fluid, having separate passages for two directions of flow, at least some of the passages having an outlet opening that is at least partially covered by at least one valve disk. Each passage has a rib that extends radially, relative to a first direction of flow of the damping fluid, from a boundary wall of the passage and bears a valve support surface for the at least one valve disk.
    Type: Grant
    Filed: February 5, 2001
    Date of Patent: April 1, 2003
    Assignee: Mannesmann Sachs AG
    Inventors: Gerald Fenn, Hassan Asadi, Matthias Höhn
  • Publication number: 20020078997
    Abstract: Switching valve with a valve body, which separates two working spaces filled with a fluid. The valve body has pass-through openings which are covered except for an inlet cross-section, where the inlet cross-section is controlled by a switching disk as a function of the direction of flow in the switching valve. Between the switching disk and the inlet cross-section, at least one spacer disk is provided, which has at least one opening, which communicates with the inlet cross-section, where the opening has a larger two-dimensional area than the inlet cross-section.
    Type: Application
    Filed: November 21, 2001
    Publication date: June 27, 2002
    Applicant: Mannesmann Sachs AG
    Inventors: Hassan Asadi, Gerald Fenn, Hans Luksch
  • Publication number: 20020043768
    Abstract: Piston ring including a covering surface which covers a circumferential surface of a piston, and supporting segments having retaining surfaces which engage the upper and lower sides of the piston. The piston ring has a butt joint which enables the piston ring to be elastically deformable radially, the butt joint being designed at one end of the covering surface with at least one tongue which engages in a cutout in the other end of the covering surface. The tongue is designed with at least one retaining segment which runs in the circumferential direction and engages in a supporting manner in each case on the upper and lower side of the piston.
    Type: Application
    Filed: August 27, 2001
    Publication date: April 18, 2002
    Applicant: Mannesmann Sachs AG
    Inventors: Gerald Fenn, Hassan Asadi, Matthias Hohn, Peter Wirth
  • Patent number: 6336536
    Abstract: Disclosed is a vibration damper with a damping valve having a reversing valve. The reversing valve has valve body having at least one passage opening with a cross section therein; a valve plate at least partially covering the passage opening and a reversing plate having at least one meandering shaped recess in the vicinity of the cover surface, and a circumferential section, wherein the recess has a starting point and an end point which bound the circumferential section the reversing plate is adapted to control the cross section of the passage opening as a function of flow direction. The valve includes a spring section extending in a circumferential direction and having at least one cover surface and a clamping surface which prestresses the reversing plate outside of the spring section and clamping surface against the reversing valve. The cover surface is aligned with the passage opening, and the circumferential section bounds the spring section.
    Type: Grant
    Filed: May 25, 2000
    Date of Patent: January 8, 2002
    Assignee: Mannesmann Sachs AG
    Inventors: Gerald Fenn, Hassan Asadi, Hans Luksch
  • Publication number: 20010023801
    Abstract: Damping-valve body, in particular for a piston-cylinder unit filled with damping fluid, having separate passages for two directions of flow, at least some of the passages having an outlet opening that is at least partially covered by at least one valve disk. Each passage has a rib that extends radially, relative to a first direction of flow of the damping fluid, from a boundary wall of the passage and bears a valve support surface for the at least one valve disk.
    Type: Application
    Filed: February 5, 2001
    Publication date: September 27, 2001
    Applicant: Mannesmann Sachs AG
    Inventors: Gerald Fenn, Hassan Asadi, Matthias Hohn