Mannesmann Sachs Ag

Zf Sachs Ag

Zf Friedrichshafen Ag

Hassan Asadi

Gerald Fenn

Hans Luksch

Thomas Manger

Helmut Baalmann

Heinz Sydekum

Thomas Thein

Peter Wirth

Wolfgang Breun

Harun Tucovic

Matthias H&ouml;hn

Oswald Lichtlein

Hans Gonschorrek

Dirk Litterscheid

Lothar Krill

Alexander Kruse

Björn Neumann

Wolfgang Bach

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.

Preloading device for a piston valve of a vibration damper

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.

Damping valve with a directionally-dependent cross section

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.

Vibration damper with fire safety device

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. The piston ring joint of the piston ring has at least one sealing surface between the ends of the piston ring.

Piston ring

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.

Fire protection in a piston-cylinder unit

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.

Piston ring, in particular for a piston of a vibration damper

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.

Switching valve with flow direction-dependent cross-section

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.

Damping valve, in particular for a vibration damper

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.

Reversing valve with a passage which is dependent on the direction of flow

A sheet-metal piston rod guide for a piston-cylinder unit in which a piston rod is axially movable, includes a slide bush which is centered by a guide sleeve which adjoins a closure ring which delimits the working chamber and in turn merges into an axial casing. The axial casing centers the entire piston rod guide. A piston rod seal surrounds the piston rod and seals the working chamber. The guide sleeve is supported in the axial and radial directions against a bearing ring which bears the piston rod seal and extends in the radial direction. The bearing ring has a radial support surface with respect to the casing so that the casing, the closure ring, the guide sleeve, and the bearing ring form a force bearing arrangement which is closed with regard to the bearing of forces.

Piston rod guide for a piston-cylinder unit

A reversing valve having a valve body which separates two working spaces which are filled with a fluid. Passage openings are arranged in the valve body and are covered at least partially by a number of valve plates. The cross sectional passage of the passage openings is controlled by a reversing plate as a function of the direction of flow. The reversing plate has spring sections which extend in the circumferential direction and at least one cover surface. The at least one cover surface is aligned with at least one passage opening. The spring sections of the reversing plate are supported on a securing plate.

Reversing valve with a cross section which is dependent on the direction

A method for manufacturing a piston, wherein the piston includes a piston body with through-channels for fluid which are covered by valve disks on supporting bodies with valve support surfaces. The piston body is constructed in one piece in a disk-shaped manner by press stamping. Starting from a base body of the piston, the raised areas of the piston body on one side of the piston are formed as depressions on the axially opposite side. The piston has at least one support for the valve disks whose axial height is adapted to the height of the support surfaces. The support on both sides of the piston is stamped from the base body of the piston and the valve support surfaces and the support are machined in the same manufacturing step on a common plane.

Growing community of inventors

Schweinfurt, Germany

Hassan Asadi