Gkn Sinter Metals Gmbh

Other

Ringsdorff-Werke Gmbh

August Bilstein Gmbh & Co.

Krebsoge Sinterholding Gmbh

Ewald May

Antonio Casellas

Rainer Schmitt

Max-Otto Rauert

Jurgen Doench

Hans-Joachim Betsch

Heinrich Sporenberg

A method for producing a one-part piston body for a piston-cylinder arrangement, in particular a shock absorber piston, is disclosed. The method may include in a first step, pressing a green compact comprising a revolving web and longitudinal support webs from a sinterable metallurgical powder. In a second step, the green compact may be sintered to form a blank. In a third step, radially disposed stamping tools may be used to form, under material displacement, transverse grooves into at least a part of the support webs through cold deformation. In a fourth step, the blank provided with transverse grooves may be calibrated to its final form through pressing with calibrating tools.

Method for making a piston body

The invention relates to a piston for a piston-cylinder arrangement, especially a shock absorber piston, comprising a piston body that is fitted with at least one peripheral web on its peripheral surface, wherein a collar-shaped sealing element made of thermoformable plastic material is also formed on the peripheral surface of the piston body in such a way that the web is only formed in part of the height of the material of the collar-shaped sealing element.

Piston for a piston-cylinder arrangement, in particular a shock absorber piston

A piston for a piston-cylinder arrangement, in particular a shock absorber piston exhibiting a piston body () provided with one peripheral web () protruding from the peripheral surface, disposed on said peripheral surface in both areas, each of which defining one end of the piston. Supporting connector elements (), which extend longitudinally in the direction of the other end of the piston, are arranged successively at a distance from each other in a parallel manner contiguous to the peripheral web, whereby each two adjacent supporting connector elements () define a groove-shaped recess () and are provided with a collar-shaped seal () made of a thermoformable sealing material, which is formed on the piston body () in such a way that the peripheral webs () as well as the supporting connector elements () are incorporated into the material of the collar-shaped seal () over only a portion of their height.

Piston with supporting connector elements for a piston-cylinder arrangement, in particular a shock absorber piston

The invention relates to a piston-cylinder arrangement, especially a shock absorber piston, comprising a piston body fitted with a peripheral web protruding from the peripheral surface in a section adjacent to the end of the piston to which support webs are attached, said web extending parallel and spaced in relation to each other in longitudinal direction towards the other end of the piston. Two adjacent support webs limit a groove-shaped recess, said webs being open on the ends opposite the peripheral web in longitudinal direction. The piston also comprises a collar-shaped sealing element made of thermoformable plastic material that is formed on the piston body in such a way that only part of the height of both the peripheral web and the support webs is formed in the material of the collar-shaped sealing element.

Piston with support webs for a piston-cylinder arrangement, in particular a shock absorber piston

The invention relates to a piston-cylinder arrangement, especially a shock absorber piston, comprising a piston body fitted with at least two peripheral webs on its peripheral surface, said webs limiting a groove and also including a collar-shaped sealing element made of thermoformable plastic material that overlaps the webs. Said piston also comprises axial passage channels in the piston body that are closed by throttle valves opening on one side and at least one radial hole connecting at least one passage channel to the groove formed between two webs.

Piston with pressure-dependent sealing effect for a piston-cylinder arrangement, in particular a shock absorber piston

A piston ( ) with a piston ring ( ) for a hydraulic or pneumatic unit fitted with a damping device and is mounted on a piston rod, dividing a cylinder ( ) into two working areas and consisting of at least two parts ( ) that are adjacent to a surface ( ) extending perpendicularly to the axis of symmetry ( ). The piston ring ( ) has an axial extension ( ) that is several times greater than the thickness ( ) of the wall of the ring and is disposed in an outer circumferential groove ( ) that extends over both parts ( ). The invention provides a piston that prevents rumbles and is easy to produce, requiring only a few components.

Piston with piston ring

A method of calibrating a component having first and second opposite large surfaces and a peripheral surface which interconnects the large surfaces and which is provided with a recess, includes the steps of placing the component in a calibrating die, thereafter introducing a calibrating slide into the recess, contacting the first large surface by a first die punch and contacting the second large surface by a second die punch for positively positioning the component in the calibrating die by the calibrating slide and the first and second die punches, and then applying a calibrating pressure to the opposite large surfaces of the component by the die punches for deforming the component to effect calibration of the recess to desired dimensions as determined by a thickness of the calibrating slide situated in the recess.

Method of calibrating a pre-formed recess

A shock-absorbing piston, a blank for the piston and a method for producing the piston include two parts being constructed radially symmetrically, but formed with outer and inner parts differing from each other. This offers great variability in the shaping of the functionally essential elements of the shock-absorbing piston.

Shock-absorbing piston made up of dissimilar joined parts, blank for the

The invention relates to shock-absorber pistons which have a piston body mountable on a piston shaft, the piston body having on both faces a circumferential chamber and these chambers being covered by valve spring disks which rest on circumferential shoulders around the circumferential chambers. The piston body has counterflow channels each leading from the circumferential chamber on one face to an aperture outside the circumferential shoulder on the opposite face. In order especially to produce a degressive response to shock as speed increases, and for this purpose to lower the transit flow resistance of the piston body as much as possible, this body is provided with a flattened zone outside of the circumferential shoulder, and provided with transit channels covering the entire area of the body except for radial partitions between the channels, the transit channels extending from radially narrow circumferentially elongated arc shaped slots to circumferentially-short or radially broad trapezoidal openings into the circumferential chambers.

Growing community of inventors

Bonn, Germany

Ewald May